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NFS - fix recent breakage to NFS error handling.
[deliverable/linux.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf
TM		 44#include <linux/mnt_namespace.h>
45#include <linux/namei.h>
f7b422b1
DH		 46#include <linux/nfs_idmap.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
fd00a8ff 49#include <linux/in6.h>
5a0e3ad6 50#include <linux/slab.h>
fd00a8ff 51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.h>
f7b422b1
DH		 56
57#include <asm/system.h>
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
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 *);
f7b422b1 266static int nfs_show_options(struct seq_file *, struct vfsmount *);
c7f404b4
AV		 267static int nfs_show_devname(struct seq_file *, struct vfsmount *);
268static int nfs_show_path(struct seq_file *, struct vfsmount *);
f7b422b1 269static int nfs_show_stats(struct seq_file *, struct vfsmount *);
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 */
724static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
725{
726 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
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
c7f404b4
AV		 764static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
765{
766 char *page = (char *) __get_free_page(GFP_KERNEL);
767 char *devname, *dummy;
768 int err = 0;
769 if (!page)
770 return -ENOMEM;
771 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
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
780static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
781{
782 seq_puts(m, "/");
783 return 0;
784}
785
f7b422b1
DH		 786/*
787 * Present statistical information for this VFS mountpoint
788 */
789static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
790{
791 int i, cpu;
792 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
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");
802 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
803 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
804 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
805 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
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
CL		 911 data->minorversion = 0;
912 }
913 return data;
914}
915
fc50d58f 916/*
cdcd7f9a
CL		 917 * Sanity-check a server address provided by the mount command.
918 *
919 * Address family must be initialized, and address must not be
920 * the ANY address for that family.
fc50d58f
CL		 921 */
922static int nfs_verify_server_address(struct sockaddr *addr)
923{
924 switch (addr->sa_family) {
925 case AF_INET: {
cdcd7f9a 926 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 927 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 928 }
929 case AF_INET6: {
930 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
931 return !ipv6_addr_any(sa);
fc50d58f
CL		 932 }
933 }
934
53a0b9c4 935 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 936 return 0;
937}
938
4cfd74fc
CL		 939/*
940 * Select between a default port value and a user-specified port value.
941 * If a zero value is set, then autobind will be used.
942 */
f5855fec 943static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 944 const unsigned short default_port)
945{
f5855fec
TM		 946 if (*port == NFS_UNSPEC_PORT)
947 *port = default_port;
4cfd74fc 948
f5855fec 949 rpc_set_port(sap, *port);
4cfd74fc
CL		 950}
951
259875ef
TM		 952/*
953 * Sanity check the NFS transport protocol.
954 *
955 */
956static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
957{
958 switch (mnt->nfs_server.protocol) {
959 case XPRT_TRANSPORT_UDP:
960 case XPRT_TRANSPORT_TCP:
961 case XPRT_TRANSPORT_RDMA:
962 break;
963 default:
964 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
965 }
966}
967
968/*
969 * For text based NFSv2/v3 mounts, the mount protocol transport default
970 * settings should depend upon the specified NFS transport.
971 */
972static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
973{
974 nfs_validate_transport_protocol(mnt);
975
976 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
977 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
978 return;
979 switch (mnt->nfs_server.protocol) {
980 case XPRT_TRANSPORT_UDP:
981 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
982 break;
983 case XPRT_TRANSPORT_TCP:
984 case XPRT_TRANSPORT_RDMA:
985 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
986 }
987}
988
01060c89
CL		 989/*
990 * Parse the value of the 'sec=' option.
01060c89
CL		 991 */
992static int nfs_parse_security_flavors(char *value,
993 struct nfs_parsed_mount_data *mnt)
994{
995 substring_t args[MAX_OPT_ARGS];
996
997 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
998
999 switch (match_token(value, nfs_secflavor_tokens, args)) {
1000 case Opt_sec_none:
01060c89
CL		 1001 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1002 break;
1003 case Opt_sec_sys:
01060c89
CL		 1004 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1005 break;
1006 case Opt_sec_krb5:
01060c89
CL		 1007 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1008 break;
1009 case Opt_sec_krb5i:
01060c89
CL		 1010 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1011 break;
1012 case Opt_sec_krb5p:
01060c89
CL		 1013 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1014 break;
1015 case Opt_sec_lkey:
01060c89
CL		 1016 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1017 break;
1018 case Opt_sec_lkeyi:
01060c89
CL		 1019 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1020 break;
1021 case Opt_sec_lkeyp:
01060c89
CL		 1022 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1023 break;
1024 case Opt_sec_spkm:
01060c89
CL		 1025 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1026 break;
1027 case Opt_sec_spkmi:
01060c89
CL		 1028 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1029 break;
1030 case Opt_sec_spkmp:
01060c89
CL		 1031 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1032 break;
1033 default:
1034 return 0;
1035 }
1036
9b7160c5 1037 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1038 mnt->auth_flavor_len = 1;
01060c89
CL		 1039 return 1;
1040}
1041
c5cb09b6
RL		 1042static int nfs_get_option_str(substring_t args[], char **option)
1043{
1044 kfree(*option);
1045 *option = match_strdup(args);
1046 return !option;
1047}
1048
1049static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1050{
1051 int rc;
1052 char *string;
1053
1054 string = match_strdup(args);
1055 if (string == NULL)
1056 return -ENOMEM;
1057 rc = strict_strtoul(string, 10, option);
1058 kfree(string);
1059
1060 return rc;
1061}
1062
bf0fd768
CL		 1063/*
1064 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1065 * a data structure. The whole mount string is processed; bad options are
1066 * skipped as they are encountered. If there were no errors, return 1;
1067 * otherwise return 0 (zero).
bf0fd768
CL		 1068 */
1069static int nfs_parse_mount_options(char *raw,
1070 struct nfs_parsed_mount_data *mnt)
1071{
f9c3a380 1072 char *p, *string, *secdata;
d23c45fd 1073 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1074 unsigned short protofamily = AF_UNSPEC;
1075 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1076
1077 if (!raw) {
1078 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1079 return 1;
1080 }
1081 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1082
f9c3a380
EP		 1083 secdata = alloc_secdata();
1084 if (!secdata)
1085 goto out_nomem;
1086
1087 rc = security_sb_copy_data(raw, secdata);
1088 if (rc)
1089 goto out_security_failure;
1090
1091 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1092 if (rc)
1093 goto out_security_failure;
1094
1095 free_secdata(secdata);
1096
bf0fd768
CL		 1097 while ((p = strsep(&raw, ",")) != NULL) {
1098 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1099 unsigned long option;
1100 int token;
bf0fd768
CL		 1101
1102 if (!*p)
1103 continue;
1104
1105 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1106
1107 token = match_token(p, nfs_mount_option_tokens, args);
1108 switch (token) {
f45663ce
CL		 1109
1110 /*
1111 * boolean options: foo/nofoo
1112 */
bf0fd768
CL		 1113 case Opt_soft:
1114 mnt->flags |= NFS_MOUNT_SOFT;
1115 break;
1116 case Opt_hard:
1117 mnt->flags &= ~NFS_MOUNT_SOFT;
1118 break;
bf0fd768
CL		 1119 case Opt_posix:
1120 mnt->flags |= NFS_MOUNT_POSIX;
1121 break;
1122 case Opt_noposix:
1123 mnt->flags &= ~NFS_MOUNT_POSIX;
1124 break;
1125 case Opt_cto:
1126 mnt->flags &= ~NFS_MOUNT_NOCTO;
1127 break;
1128 case Opt_nocto:
1129 mnt->flags |= NFS_MOUNT_NOCTO;
1130 break;
1131 case Opt_ac:
1132 mnt->flags &= ~NFS_MOUNT_NOAC;
1133 break;
1134 case Opt_noac:
1135 mnt->flags |= NFS_MOUNT_NOAC;
1136 break;
1137 case Opt_lock:
1138 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1139 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1140 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1141 break;
1142 case Opt_nolock:
1143 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1144 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1145 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1146 break;
1147 case Opt_v2:
1148 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1149 mnt->version = 2;
bf0fd768
CL		 1150 break;
1151 case Opt_v3:
1152 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1153 mnt->version = 3;
bf0fd768 1154 break;
764302cc
CL		 1155 case Opt_v4:
1156 mnt->flags &= ~NFS_MOUNT_VER3;
1157 mnt->version = 4;
1158 break;
bf0fd768
CL		 1159 case Opt_udp:
1160 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1161 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1162 break;
1163 case Opt_tcp:
1164 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1165 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1166 break;
2cf7ff7a
TT		 1167 case Opt_rdma:
1168 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1169 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1170 xprt_load_transport(p);
2cf7ff7a 1171 break;
bf0fd768
CL		 1172 case Opt_acl:
1173 mnt->flags &= ~NFS_MOUNT_NOACL;
1174 break;
1175 case Opt_noacl:
1176 mnt->flags |= NFS_MOUNT_NOACL;
1177 break;
1178 case Opt_rdirplus:
1179 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1180 break;
1181 case Opt_nordirplus:
1182 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1183 break;
75180df2
TM		 1184 case Opt_sharecache:
1185 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1186 break;
1187 case Opt_nosharecache:
1188 mnt->flags |= NFS_MOUNT_UNSHARED;
1189 break;
d740351b
CL		 1190 case Opt_resvport:
1191 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1192 break;
1193 case Opt_noresvport:
1194 mnt->flags |= NFS_MOUNT_NORESVPORT;
1195 break;
b797cac7
DH		 1196 case Opt_fscache:
1197 mnt->options |= NFS_OPTION_FSCACHE;
1198 kfree(mnt->fscache_uniq);
1199 mnt->fscache_uniq = NULL;
1200 break;
1201 case Opt_nofscache:
1202 mnt->options &= ~NFS_OPTION_FSCACHE;
1203 kfree(mnt->fscache_uniq);
1204 mnt->fscache_uniq = NULL;
1205 break;
bf0fd768 1206
f45663ce
CL		 1207 /*
1208 * options that take numeric values
1209 */
bf0fd768 1210 case Opt_port:
c5cb09b6
RL		 1211 if (nfs_get_option_ul(args, &option) ||
1212 option > USHRT_MAX)
d23c45fd
CL		 1213 goto out_invalid_value;
1214 mnt->nfs_server.port = option;
bf0fd768
CL		 1215 break;
1216 case Opt_rsize:
c5cb09b6 1217 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1218 goto out_invalid_value;
1219 mnt->rsize = option;
bf0fd768
CL		 1220 break;
1221 case Opt_wsize:
c5cb09b6 1222 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1223 goto out_invalid_value;
1224 mnt->wsize = option;
bf0fd768
CL		 1225 break;
1226 case Opt_bsize:
c5cb09b6 1227 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1228 goto out_invalid_value;
1229 mnt->bsize = option;
bf0fd768
CL		 1230 break;
1231 case Opt_timeo:
c5cb09b6 1232 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1233 goto out_invalid_value;
1234 mnt->timeo = option;
bf0fd768
CL		 1235 break;
1236 case Opt_retrans:
c5cb09b6 1237 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1238 goto out_invalid_value;
1239 mnt->retrans = option;
bf0fd768
CL		 1240 break;
1241 case Opt_acregmin:
c5cb09b6 1242 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1243 goto out_invalid_value;
1244 mnt->acregmin = option;
bf0fd768
CL		 1245 break;
1246 case Opt_acregmax:
c5cb09b6 1247 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1248 goto out_invalid_value;
1249 mnt->acregmax = option;
bf0fd768
CL		 1250 break;
1251 case Opt_acdirmin:
c5cb09b6 1252 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1253 goto out_invalid_value;
1254 mnt->acdirmin = option;
bf0fd768
CL		 1255 break;
1256 case Opt_acdirmax:
c5cb09b6 1257 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1258 goto out_invalid_value;
1259 mnt->acdirmax = option;
bf0fd768
CL		 1260 break;
1261 case Opt_actimeo:
c5cb09b6 1262 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1263 goto out_invalid_value;
1264 mnt->acregmin = mnt->acregmax =
1265 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1266 break;
1267 case Opt_namelen:
c5cb09b6 1268 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1269 goto out_invalid_value;
1270 mnt->namlen = option;
bf0fd768
CL		 1271 break;
1272 case Opt_mountport:
c5cb09b6
RL		 1273 if (nfs_get_option_ul(args, &option) ||
1274 option > USHRT_MAX)
d23c45fd
CL		 1275 goto out_invalid_value;
1276 mnt->mount_server.port = option;
bf0fd768 1277 break;
bf0fd768 1278 case Opt_mountvers:
c5cb09b6 1279 if (nfs_get_option_ul(args, &option) ||
f45663ce 1280 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1281 option > NFS_MNT3_VERSION)
1282 goto out_invalid_value;
1283 mnt->mount_server.version = option;
bf0fd768 1284 break;
bf0fd768 1285 case Opt_nfsvers:
c5cb09b6 1286 if (nfs_get_option_ul(args, &option))
d23c45fd 1287 goto out_invalid_value;
bf0fd768 1288 switch (option) {
f45663ce 1289 case NFS2_VERSION:
bf0fd768 1290 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1291 mnt->version = 2;
bf0fd768 1292 break;
f45663ce 1293 case NFS3_VERSION:
bf0fd768 1294 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1295 mnt->version = 3;
1296 break;
764302cc
CL		 1297 case NFS4_VERSION:
1298 mnt->flags &= ~NFS_MOUNT_VER3;
1299 mnt->version = 4;
bf0fd768
CL		 1300 break;
1301 default:
d23c45fd 1302 goto out_invalid_value;
bf0fd768
CL		 1303 }
1304 break;
3fd5be9e 1305 case Opt_minorversion:
c5cb09b6 1306 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1307 goto out_invalid_value;
1308 if (option > NFS4_MAX_MINOR_VERSION)
1309 goto out_invalid_value;
1310 mnt->minorversion = option;
3fd5be9e 1311 break;
bf0fd768 1312
f45663ce
CL		 1313 /*
1314 * options that take text values
1315 */
bf0fd768
CL		 1316 case Opt_sec:
1317 string = match_strdup(args);
1318 if (string == NULL)
1319 goto out_nomem;
01060c89 1320 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1321 kfree(string);
f45663ce 1322 if (!rc) {
f45663ce
CL		 1323 dfprintk(MOUNT, "NFS: unrecognized "
1324 "security flavor\n");
d23c45fd 1325 return 0;
f45663ce 1326 }
bf0fd768
CL		 1327 break;
1328 case Opt_proto:
1329 string = match_strdup(args);
1330 if (string == NULL)
1331 goto out_nomem;
1332 token = match_token(string,
1333 nfs_xprt_protocol_tokens, args);
bf0fd768 1334
ee671b01 1335 protofamily = AF_INET;
bf0fd768 1336 switch (token) {
ee671b01
JL		 1337 case Opt_xprt_udp6:
1338 protofamily = AF_INET6;
fdb66ff4 1339 case Opt_xprt_udp:
bf0fd768 1340 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1341 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1342 break;
ee671b01
JL		 1343 case Opt_xprt_tcp6:
1344 protofamily = AF_INET6;
fdb66ff4 1345 case Opt_xprt_tcp:
bf0fd768 1346 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1347 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1348 break;
2cf7ff7a
TT		 1349 case Opt_xprt_rdma:
1350 /* vector side protocols to TCP */
1351 mnt->flags |= NFS_MOUNT_TCP;
1352 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1353 xprt_load_transport(string);
2cf7ff7a 1354 break;
bf0fd768 1355 default:
f45663ce
CL		 1356 dfprintk(MOUNT, "NFS: unrecognized "
1357 "transport protocol\n");
4223a4a1 1358 kfree(string);
d23c45fd 1359 return 0;
bf0fd768 1360 }
c5cb09b6 1361 kfree(string);
bf0fd768
CL		 1362 break;
1363 case Opt_mountproto:
1364 string = match_strdup(args);
1365 if (string == NULL)
1366 goto out_nomem;
1367 token = match_token(string,
1368 nfs_xprt_protocol_tokens, args);
d508afb4 1369 kfree(string);
bf0fd768 1370
ee671b01 1371 mountfamily = AF_INET;
bf0fd768 1372 switch (token) {
ee671b01
JL		 1373 case Opt_xprt_udp6:
1374 mountfamily = AF_INET6;
fdb66ff4 1375 case Opt_xprt_udp:
0896a725 1376 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1377 break;
ee671b01
JL		 1378 case Opt_xprt_tcp6:
1379 mountfamily = AF_INET6;
fdb66ff4 1380 case Opt_xprt_tcp:
0896a725 1381 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1382 break;
2cf7ff7a 1383 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1384 default:
f45663ce
CL		 1385 dfprintk(MOUNT, "NFS: unrecognized "
1386 "transport protocol\n");
d23c45fd 1387 return 0;
bf0fd768
CL		 1388 }
1389 break;
1390 case Opt_addr:
1391 string = match_strdup(args);
1392 if (string == NULL)
1393 goto out_nomem;
53a0b9c4
CL		 1394 mnt->nfs_server.addrlen =
1395 rpc_pton(string, strlen(string),
1396 (struct sockaddr *)
1397 &mnt->nfs_server.address,
1398 sizeof(mnt->nfs_server.address));
bf0fd768 1399 kfree(string);
53a0b9c4
CL		 1400 if (mnt->nfs_server.addrlen == 0)
1401 goto out_invalid_address;
bf0fd768
CL		 1402 break;
1403 case Opt_clientaddr:
c5cb09b6 1404 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1405 goto out_nomem;
bf0fd768 1406 break;
33832034 1407 case Opt_mounthost:
c5cb09b6
RL		 1408 if (nfs_get_option_str(args,
1409 &mnt->mount_server.hostname))
33832034 1410 goto out_nomem;
33832034 1411 break;
0ac83779 1412 case Opt_mountaddr:
bf0fd768
CL		 1413 string = match_strdup(args);
1414 if (string == NULL)
1415 goto out_nomem;
53a0b9c4
CL		 1416 mnt->mount_server.addrlen =
1417 rpc_pton(string, strlen(string),
1418 (struct sockaddr *)
1419 &mnt->mount_server.address,
1420 sizeof(mnt->mount_server.address));
bf0fd768 1421 kfree(string);
53a0b9c4
CL		 1422 if (mnt->mount_server.addrlen == 0)
1423 goto out_invalid_address;
bf0fd768 1424 break;
7973c1f1
TM		 1425 case Opt_lookupcache:
1426 string = match_strdup(args);
1427 if (string == NULL)
1428 goto out_nomem;
1429 token = match_token(string,
1430 nfs_lookupcache_tokens, args);
1431 kfree(string);
1432 switch (token) {
1433 case Opt_lookupcache_all:
1434 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1435 break;
1436 case Opt_lookupcache_positive:
1437 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1438 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1439 break;
1440 case Opt_lookupcache_none:
1441 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1442 break;
1443 default:
7973c1f1
TM		 1444 dfprintk(MOUNT, "NFS: invalid "
1445 "lookupcache argument\n");
d23c45fd 1446 return 0;
7973c1f1
TM		 1447 };
1448 break;
a6d5ff64 1449 case Opt_fscache_uniq:
c5cb09b6 1450 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1451 goto out_nomem;
a6d5ff64
CL		 1452 mnt->options |= NFS_OPTION_FSCACHE;
1453 break;
5eebde23
SJ		 1454 case Opt_local_lock:
1455 string = match_strdup(args);
1456 if (string == NULL)
1457 goto out_nomem;
1458 token = match_token(string, nfs_local_lock_tokens,
1459 args);
1460 kfree(string);
1461 switch (token) {
1462 case Opt_local_lock_all:
1463 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1464 NFS_MOUNT_LOCAL_FCNTL);
1465 break;
1466 case Opt_local_lock_flock:
1467 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1468 break;
1469 case Opt_local_lock_posix:
1470 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1471 break;
1472 case Opt_local_lock_none:
1473 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1474 NFS_MOUNT_LOCAL_FCNTL);
1475 break;
1476 default:
1477 dfprintk(MOUNT, "NFS: invalid "
1478 "local_lock argument\n");
1479 return 0;
1480 };
1481 break;
bf0fd768 1482
f45663ce
CL		 1483 /*
1484 * Special options
1485 */
1486 case Opt_sloppy:
1487 sloppy = 1;
1488 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1489 break;
bf0fd768
CL		 1490 case Opt_userspace:
1491 case Opt_deprecated:
d33e4dfe
CL		 1492 dfprintk(MOUNT, "NFS: ignoring mount option "
1493 "'%s'\n", p);
bf0fd768
CL		 1494 break;
1495
1496 default:
d23c45fd 1497 invalid_option = 1;
f45663ce
CL		 1498 dfprintk(MOUNT, "NFS: unrecognized mount option "
1499 "'%s'\n", p);
bf0fd768
CL		 1500 }
1501 }
1502
d23c45fd
CL		 1503 if (!sloppy && invalid_option)
1504 return 0;
1505
ee671b01
JL		 1506 /*
1507 * verify that any proto=/mountproto= options match the address
1508 * familiies in the addr=/mountaddr= options.
1509 */
1510 if (protofamily != AF_UNSPEC &&
1511 protofamily != mnt->nfs_server.address.ss_family)
1512 goto out_proto_mismatch;
1513
1514 if (mountfamily != AF_UNSPEC) {
1515 if (mnt->mount_server.addrlen) {
1516 if (mountfamily != mnt->mount_server.address.ss_family)
1517 goto out_mountproto_mismatch;
1518 } else {
1519 if (mountfamily != mnt->nfs_server.address.ss_family)
1520 goto out_mountproto_mismatch;
1521 }
1522 }
1523
bf0fd768
CL		 1524 return 1;
1525
ee671b01
JL		 1526out_mountproto_mismatch:
1527 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1528 "option\n");
1529 return 0;
1530out_proto_mismatch:
1531 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1532 return 0;
53a0b9c4
CL		 1533out_invalid_address:
1534 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1535 return 0;
d23c45fd 1536out_invalid_value:
53a0b9c4 1537 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1538 return 0;
bf0fd768
CL		 1539out_nomem:
1540 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1541 return 0;
f9c3a380
EP		 1542out_security_failure:
1543 free_secdata(secdata);
1544 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1545 return 0;
bf0fd768
CL		 1546}
1547
ec88f28d
CL		 1548/*
1549 * Match the requested auth flavors with the list returned by
1550 * the server. Returns zero and sets the mount's authentication
1551 * flavor on success; returns -EACCES if server does not support
1552 * the requested flavor.
1553 */
1554static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1555 struct nfs_mount_request *request)
1556{
1557 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1558
5eecfde6
CL		 1559 /*
1560 * Certain releases of Linux's mountd return an empty
1561 * flavor list. To prevent behavioral regression with
1562 * these servers (ie. rejecting mounts that used to
1563 * succeed), revert to pre-2.6.32 behavior (no checking)
1564 * if the returned flavor list is empty.
1565 */
1566 if (server_authlist_len == 0)
1567 return 0;
1568
ec88f28d
CL		 1569 /*
1570 * We avoid sophisticated negotiating here, as there are
1571 * plenty of cases where we can get it wrong, providing
1572 * either too little or too much security.
1573 *
1574 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1575 * flavor listed first. However, some servers list
1576 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1577 * preferred default, in args->auth_flavors[0] if user
1578 * didn't specify sec= mount option.
1579 */
1580 for (i = 0; i < args->auth_flavor_len; i++)
1581 for (j = 0; j < server_authlist_len; j++)
1582 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1583 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1584 request->auth_flavs[j]);
1585 args->auth_flavors[0] = request->auth_flavs[j];
1586 return 0;
1587 }
1588
1589 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1590 nfs_umount(request);
1591 return -EACCES;
1592}
1593
0076d7b7
CL		 1594/*
1595 * Use the remote server's MOUNT service to request the NFS file handle
1596 * corresponding to the provided path.
1597 */
1598static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1599 struct nfs_fh *root_fh)
1600{
ec88f28d
CL		 1601 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1602 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1603 struct nfs_mount_request request = {
1604 .sap = (struct sockaddr *)
1605 &args->mount_server.address,
1606 .dirpath = args->nfs_server.export_path,
1607 .protocol = args->mount_server.protocol,
1608 .fh = root_fh,
50a737f8 1609 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1610 .auth_flav_len = &server_authlist_len,
1611 .auth_flavs = server_authlist,
c5d120f8 1612 };
4c568017 1613 int status;
0076d7b7
CL		 1614
1615 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1616 switch (args->version) {
1617 default:
1618 args->mount_server.version = NFS_MNT3_VERSION;
1619 break;
1620 case 2:
1621 args->mount_server.version = NFS_MNT_VERSION;
1622 }
0076d7b7 1623 }
c5d120f8 1624 request.version = args->mount_server.version;
0076d7b7 1625
33832034 1626 if (args->mount_server.hostname)
c5d120f8 1627 request.hostname = args->mount_server.hostname;
33832034 1628 else
c5d120f8 1629 request.hostname = args->nfs_server.hostname;
33832034 1630
0076d7b7
CL		 1631 /*
1632 * Construct the mount server's address.
1633 */
4c568017 1634 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1635 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1636 args->nfs_server.addrlen);
1637 args->mount_server.addrlen = args->nfs_server.addrlen;
1638 }
c5d120f8 1639 request.salen = args->mount_server.addrlen;
f5855fec 1640 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1641
1642 /*
1643 * Now ask the mount server to map our export path
1644 * to a file handle.
1645 */
c5d120f8 1646 status = nfs_mount(&request);
ec88f28d
CL		 1647 if (status != 0) {
1648 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1649 request.hostname, status);
1650 return status;
1651 }
0076d7b7 1652
ec88f28d
CL		 1653 /*
1654 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1655 */
1656 if (args->mount_server.version != NFS_MNT3_VERSION)
1657 return 0;
1658 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1659}
1660
c12bacec
RL		 1661/*
1662 * Split "dev_name" into "hostname:export_path".
1663 *
1664 * The leftmost colon demarks the split between the server's hostname
1665 * and the export path. If the hostname starts with a left square
1666 * bracket, then it may contain colons.
1667 *
1668 * Note: caller frees hostname and export path, even on error.
1669 */
1670static int nfs_parse_devname(const char *dev_name,
1671 char **hostname, size_t maxnamlen,
1672 char **export_path, size_t maxpathlen)
dc045898
CL		 1673{
1674 size_t len;
c12bacec 1675 char *end;
dc045898 1676
c12bacec
RL		 1677 /* Is the host name protected with square brakcets? */
1678 if (*dev_name == '[') {
1679 end = strchr(++dev_name, ']');
1680 if (end == NULL || end[1] != ':')
dc045898 1681 goto out_bad_devname;
dc045898 1682
c12bacec
RL		 1683 len = end - dev_name;
1684 end++;
1685 } else {
1686 char *comma;
dc045898 1687
c12bacec
RL		 1688 end = strchr(dev_name, ':');
1689 if (end == NULL)
1690 goto out_bad_devname;
1691 len = end - dev_name;
d1aa0825 1692
c12bacec
RL		 1693 /* kill possible hostname list: not supported */
1694 comma = strchr(dev_name, ',');
1695 if (comma != NULL && comma < end)
1696 *comma = 0;
1697 }
d1aa0825 1698
d1aa0825
CL		 1699 if (len > maxnamlen)
1700 goto out_hostname;
1701
1702 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1703 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1704 if (*hostname == NULL)
1705 goto out_nomem;
c12bacec 1706 len = strlen(++end);
d1aa0825
CL		 1707 if (len > maxpathlen)
1708 goto out_path;
1709 *export_path = kstrndup(end, len, GFP_KERNEL);
1710 if (!*export_path)
1711 goto out_nomem;
1712
c12bacec 1713 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1714 return 0;
1715
1716out_bad_devname:
1717 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1718 return -EINVAL;
1719
1720out_nomem:
1721 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1722 return -ENOMEM;
1723
1724out_hostname:
1725 dfprintk(MOUNT, "NFS: server hostname too long\n");
1726 return -ENAMETOOLONG;
1727
1728out_path:
1729 dfprintk(MOUNT, "NFS: export pathname too long\n");
1730 return -ENAMETOOLONG;
1731}
1732
f7b422b1 1733/*
54ceac45
DH		 1734 * Validate the NFS2/NFS3 mount data
1735 * - fills in the mount root filehandle
136d558c
CL		 1736 *
1737 * For option strings, user space handles the following behaviors:
1738 *
1739 * + DNS: mapping server host name to IP address ("addr=" option)
1740 *
1741 * + failure mode: how to behave if a mount request can't be handled
1742 * immediately ("fg/bg" option)
1743 *
1744 * + retry: how often to retry a mount request ("retry=" option)
1745 *
1746 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1747 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1748 */
2283f8d6
TT		 1749static int nfs_validate_mount_data(void *options,
1750 struct nfs_parsed_mount_data *args,
136d558c
CL		 1751 struct nfs_fh *mntfh,
1752 const char *dev_name)
f7b422b1 1753{
2283f8d6 1754 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1755 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1756
5df36e78
CL		 1757 if (data == NULL)
1758 goto out_no_data;
f7b422b1 1759
54ceac45 1760 switch (data->version) {
5df36e78
CL		 1761 case 1:
1762 data->namlen = 0;
1763 case 2:
1764 data->bsize = 0;
1765 case 3:
1766 if (data->flags & NFS_MOUNT_VER3)
1767 goto out_no_v3;
1768 data->root.size = NFS2_FHSIZE;
1769 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1770 case 4:
1771 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1772 goto out_no_sec;
1773 case 5:
1774 memset(data->context, 0, sizeof(data->context));
1775 case 6:
b7e24457
TM		 1776 if (data->flags & NFS_MOUNT_VER3) {
1777 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1778 goto out_invalid_fh;
5df36e78 1779 mntfh->size = data->root.size;
764302cc
CL		 1780 args->version = 3;
1781 } else {
5df36e78 1782 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1783 args->version = 2;
1784 }
5df36e78 1785
5df36e78
CL		 1786
1787 memcpy(mntfh->data, data->root.data, mntfh->size);
1788 if (mntfh->size < sizeof(mntfh->data))
1789 memset(mntfh->data + mntfh->size, 0,
1790 sizeof(mntfh->data) - mntfh->size);
6e88e061 1791
2283f8d6
TT		 1792 /*
1793 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1794 * can deal with.
1795 */
ff3525a5 1796 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1797 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1798 args->rsize = data->rsize;
1799 args->wsize = data->wsize;
2283f8d6
TT		 1800 args->timeo = data->timeo;
1801 args->retrans = data->retrans;
1802 args->acregmin = data->acregmin;
1803 args->acregmax = data->acregmax;
1804 args->acdirmin = data->acdirmin;
1805 args->acdirmax = data->acdirmax;
4c568017 1806
4cfd74fc 1807 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1808 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1809 if (!nfs_verify_server_address(sap))
4c568017
CL		 1810 goto out_no_address;
1811
2283f8d6 1812 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1813 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1814 /* N.B. caller will free nfs_server.hostname in all cases */
1815 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1816 args->namlen = data->namlen;
1817 args->bsize = data->bsize;
dd07c947
CL		 1818
1819 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1820 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1821 if (!args->nfs_server.hostname)
1822 goto out_nomem;
f9c3a380 1823
5eebde23
SJ		 1824 if (!(data->flags & NFS_MOUNT_NONLM))
1825 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1826 NFS_MOUNT_LOCAL_FCNTL);
1827 else
1828 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1829 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1830 /*
1831 * The legacy version 6 binary mount data from userspace has a
1832 * field used only to transport selinux information into the
1833 * the kernel. To continue to support that functionality we
1834 * have a touch of selinux knowledge here in the NFS code. The
1835 * userspace code converted context=blah to just blah so we are
1836 * converting back to the full string selinux understands.
1837 */
1838 if (data->context[0]){
1839#ifdef CONFIG_SECURITY_SELINUX
1840 int rc;
1841 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1842 if (!opts_str)
1843 return -ENOMEM;
1844 strcpy(opts_str, "context=");
1845 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1846 strcat(opts_str, &data->context[0]);
1847 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1848 kfree(opts_str);
1849 if (rc)
1850 return rc;
1851#else
1852 return -EINVAL;
1853#endif
1854 }
1855
5df36e78 1856 break;
136d558c 1857 default: {
136d558c 1858 int status;
136d558c 1859
2283f8d6
TT		 1860 if (nfs_parse_mount_options((char *)options, args) == 0)
1861 return -EINVAL;
136d558c 1862
4cfd74fc 1863 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1864 goto out_no_address;
1865
764302cc
CL		 1866 if (args->version == 4)
1867#ifdef CONFIG_NFS_V4
1868 return nfs4_validate_text_mount_data(options,
1869 args, dev_name);
1870#else
1871 goto out_v4_not_compiled;
1872#endif
1873
f5855fec 1874 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1875
259875ef
TM		 1876 nfs_set_mount_transport_protocol(args);
1877
dc045898
CL		 1878 status = nfs_parse_devname(dev_name,
1879 &args->nfs_server.hostname,
1880 PAGE_SIZE,
1881 &args->nfs_server.export_path,
1882 NFS_MAXPATHLEN);
1883 if (!status)
1884 status = nfs_try_mount(args, mntfh);
136d558c 1885
dc045898
CL		 1886 kfree(args->nfs_server.export_path);
1887 args->nfs_server.export_path = NULL;
136d558c 1888
136d558c 1889 if (status)
fdc6e2c8 1890 return status;
136d558c 1891
136d558c
CL		 1892 break;
1893 }
f7b422b1 1894 }
54ceac45
DH		 1895
1896#ifndef CONFIG_NFS_V3
8a6e5deb 1897 if (args->version == 3)
5df36e78
CL		 1898 goto out_v3_not_compiled;
1899#endif /* !CONFIG_NFS_V3 */
f7b422b1 1900
5df36e78 1901 return 0;
f7b422b1 1902
5df36e78
CL		 1903out_no_data:
1904 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1905 return -EINVAL;
54ceac45 1906
5df36e78
CL		 1907out_no_v3:
1908 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1909 data->version);
1910 return -EINVAL;
f7b422b1 1911
5df36e78
CL		 1912out_no_sec:
1913 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1914 return -EINVAL;
1915
5df36e78
CL		 1916#ifndef CONFIG_NFS_V3
1917out_v3_not_compiled:
1918 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1919 return -EPROTONOSUPPORT;
1920#endif /* !CONFIG_NFS_V3 */
1921
764302cc
CL		 1922#ifndef CONFIG_NFS_V4
1923out_v4_not_compiled:
1924 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1925 return -EPROTONOSUPPORT;
1926#endif /* !CONFIG_NFS_V4 */
1927
63649bd7
CG		 1928out_nomem:
1929 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1930 return -ENOMEM;
1931
5df36e78
CL		 1932out_no_address:
1933 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1934 return -EINVAL;
1935
1936out_invalid_fh:
1937 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1938 return -EINVAL;
f7b422b1
DH		 1939}
1940
48b605f8
JL		 1941static int
1942nfs_compare_remount_data(struct nfs_server *nfss,
1943 struct nfs_parsed_mount_data *data)
1944{
1945 if (data->flags != nfss->flags ||
1946 data->rsize != nfss->rsize ||
1947 data->wsize != nfss->wsize ||
1948 data->retrans != nfss->client->cl_timeout->to_retries ||
1949 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1950 data->acregmin != nfss->acregmin / HZ ||
1951 data->acregmax != nfss->acregmax / HZ ||
1952 data->acdirmin != nfss->acdirmin / HZ ||
1953 data->acdirmax != nfss->acdirmax / HZ ||
1954 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1955 data->nfs_server.port != nfss->port ||
48b605f8 1956 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1957 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1958 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1959 return -EINVAL;
1960
1961 return 0;
1962}
1963
1964static int
1965nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1966{
1967 int error;
1968 struct nfs_server *nfss = sb->s_fs_info;
1969 struct nfs_parsed_mount_data *data;
1970 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1971 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1972 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1973
1974 /*
1975 * Userspace mount programs that send binary options generally send
1976 * them populated with default values. We have no way to know which
1977 * ones were explicitly specified. Fall back to legacy behavior and
1978 * just return success.
1979 */
31c94469
MZ		 1980 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1981 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1982 options->version <= 6))))
48b605f8
JL		 1983 return 0;
1984
1985 data = kzalloc(sizeof(*data), GFP_KERNEL);
1986 if (data == NULL)
1987 return -ENOMEM;
1988
1989 /* fill out struct with values from existing mount */
1990 data->flags = nfss->flags;
1991 data->rsize = nfss->rsize;
1992 data->wsize = nfss->wsize;
1993 data->retrans = nfss->client->cl_timeout->to_retries;
1994 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1995 data->acregmin = nfss->acregmin / HZ;
1996 data->acregmax = nfss->acregmax / HZ;
1997 data->acdirmin = nfss->acdirmin / HZ;
1998 data->acdirmax = nfss->acdirmax / HZ;
1999 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2000 data->nfs_server.port = nfss->port;
48b605f8
JL		 2001 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2002 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2003 data->nfs_server.addrlen);
2004
2005 /* overwrite those values with any that were specified */
2006 error = nfs_parse_mount_options((char *)options, data);
2007 if (error < 0)
2008 goto out;
2009
26c4c170
JL		 2010 /*
2011 * noac is a special case. It implies -o sync, but that's not
2012 * necessarily reflected in the mtab options. do_remount_sb
2013 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2014 * remount options, so we have to explicitly reset it.
2015 */
2016 if (data->flags & NFS_MOUNT_NOAC)
2017 *flags |= MS_SYNCHRONOUS;
2018
48b605f8
JL		 2019 /* compare new mount options with old ones */
2020 error = nfs_compare_remount_data(nfss, data);
2021out:
2022 kfree(data);
2023 return error;
2024}
2025
f7b422b1 2026/*
54ceac45 2027 * Initialise the common bits of the superblock
f7b422b1 2028 */
54ceac45 2029static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2030{
54ceac45 2031 struct nfs_server *server = NFS_SB(sb);
5006a76c 2032
54ceac45 2033 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2034
54ceac45
DH		 2035 /* We probably want something more informative here */
2036 snprintf(sb->s_id, sizeof(sb->s_id),
2037 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2038
54ceac45
DH		 2039 if (sb->s_blocksize == 0)
2040 sb->s_blocksize = nfs_block_bits(server->wsize,
2041 &sb->s_blocksize_bits);
f7b422b1 2042
32a88aa1
JA		 2043 sb->s_bdi = &server->backing_dev_info;
2044
54ceac45 2045 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2046}
2047
2048/*
54ceac45 2049 * Finish setting up an NFS2/3 superblock
f7b422b1 2050 */
2283f8d6
TT		 2051static void nfs_fill_super(struct super_block *sb,
2052 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2053{
2054 struct nfs_server *server = NFS_SB(sb);
5006a76c 2055
54ceac45
DH		 2056 sb->s_blocksize_bits = 0;
2057 sb->s_blocksize = 0;
2058 if (data->bsize)
2059 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2060
8a6e5deb 2061 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2062 /* The VFS shouldn't apply the umask to mode bits. We will do
2063 * so ourselves when necessary.
2064 */
2065 sb->s_flags |= MS_POSIXACL;
2066 sb->s_time_gran = 1;
816724e6 2067 }
54ceac45
DH		 2068
2069 sb->s_op = &nfs_sops;
2070 nfs_initialise_sb(sb);
f7b422b1
DH		 2071}
2072
2073/*
54ceac45 2074 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2075 */
54ceac45
DH		 2076static void nfs_clone_super(struct super_block *sb,
2077 const struct super_block *old_sb)
f7b422b1 2078{
54ceac45
DH		 2079 struct nfs_server *server = NFS_SB(sb);
2080
2081 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2082 sb->s_blocksize = old_sb->s_blocksize;
2083 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2084
8a6e5deb 2085 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2086 /* The VFS shouldn't apply the umask to mode bits. We will do
2087 * so ourselves when necessary.
f7b422b1
DH		 2088 */
2089 sb->s_flags |= MS_POSIXACL;
f7b422b1 2090 sb->s_time_gran = 1;
f7b422b1
DH		 2091 }
2092
54ceac45
DH		 2093 sb->s_op = old_sb->s_op;
2094 nfs_initialise_sb(sb);
f7b422b1
DH		 2095}
2096
275a5d24
TM		 2097static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2098{
2099 const struct nfs_server *a = s->s_fs_info;
2100 const struct rpc_clnt *clnt_a = a->client;
2101 const struct rpc_clnt *clnt_b = b->client;
2102
2103 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2104 goto Ebusy;
2105 if (a->nfs_client != b->nfs_client)
2106 goto Ebusy;
2107 if (a->flags != b->flags)
2108 goto Ebusy;
2109 if (a->wsize != b->wsize)
2110 goto Ebusy;
2111 if (a->rsize != b->rsize)
2112 goto Ebusy;
2113 if (a->acregmin != b->acregmin)
2114 goto Ebusy;
2115 if (a->acregmax != b->acregmax)
2116 goto Ebusy;
2117 if (a->acdirmin != b->acdirmin)
2118 goto Ebusy;
2119 if (a->acdirmax != b->acdirmax)
2120 goto Ebusy;
2121 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2122 goto Ebusy;
e89a5a43 2123 return 1;
275a5d24 2124Ebusy:
e89a5a43
TM		 2125 return 0;
2126}
2127
2128struct nfs_sb_mountdata {
2129 struct nfs_server *server;
2130 int mntflags;
2131};
2132
2133static int nfs_set_super(struct super_block *s, void *data)
2134{
2135 struct nfs_sb_mountdata *sb_mntdata = data;
2136 struct nfs_server *server = sb_mntdata->server;
2137 int ret;
2138
2139 s->s_flags = sb_mntdata->mntflags;
2140 s->s_fs_info = server;
8b244ff2 2141 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2142 ret = set_anon_super(s, server);
2143 if (ret == 0)
2144 server->s_dev = s->s_dev;
2145 return ret;
2146}
2147
fd00a8ff
CL		 2148static int nfs_compare_super_address(struct nfs_server *server1,
2149 struct nfs_server *server2)
2150{
2151 struct sockaddr *sap1, *sap2;
2152
2153 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2154 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2155
2156 if (sap1->sa_family != sap2->sa_family)
2157 return 0;
2158
2159 switch (sap1->sa_family) {
2160 case AF_INET: {
2161 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2162 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2163 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2164 return 0;
2165 if (sin1->sin_port != sin2->sin_port)
2166 return 0;
2167 break;
2168 }
2169 case AF_INET6: {
2170 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2171 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2172 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2173 return 0;
2174 if (sin1->sin6_port != sin2->sin6_port)
2175 return 0;
2176 break;
2177 }
2178 default:
2179 return 0;
2180 }
2181
2182 return 1;
2183}
2184
e89a5a43
TM		 2185static int nfs_compare_super(struct super_block *sb, void *data)
2186{
2187 struct nfs_sb_mountdata *sb_mntdata = data;
2188 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2189 int mntflags = sb_mntdata->mntflags;
2190
fd00a8ff 2191 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2192 return 0;
2193 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2194 if (old->flags & NFS_MOUNT_UNSHARED)
2195 return 0;
2196 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2197 return 0;
2198 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2199}
2200
fa799759
MS		 2201static int nfs_bdi_register(struct nfs_server *server)
2202{
2203 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2204}
2205
01194981
AV		 2206static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2207 int flags, const char *dev_name, void *raw_data)
f7b422b1 2208{
f7b422b1
DH		 2209 struct nfs_server *server = NULL;
2210 struct super_block *s;
33852a1f
TM		 2211 struct nfs_parsed_mount_data *data;
2212 struct nfs_fh *mntfh;
01194981 2213 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2214 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2215 struct nfs_sb_mountdata sb_mntdata = {
2216 .mntflags = flags,
2217 };
01194981 2218 int error;
33852a1f 2219
1e657bd5 2220 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2221 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2222 if (data == NULL || mntfh == NULL)
2223 goto out_free_fh;
f7b422b1 2224
33852a1f 2225 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2226
54ceac45 2227 /* Validate the mount data */
33852a1f 2228 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2229 if (error < 0) {
2230 mntroot = ERR_PTR(error);
0655960f 2231 goto out;
01194981 2232 }
f7b422b1 2233
764302cc
CL		 2234#ifdef CONFIG_NFS_V4
2235 if (data->version == 4) {
01194981 2236 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc 2237 kfree(data->client_address);
9699eda6 2238 kfree(data->nfs_server.export_path);
764302cc
CL		 2239 goto out;
2240 }
2241#endif /* CONFIG_NFS_V4 */
2242
54ceac45 2243 /* Get a volume representation */
33852a1f 2244 server = nfs_create_server(data, mntfh);
54ceac45 2245 if (IS_ERR(server)) {
01194981 2246 mntroot = ERR_CAST(server);
0655960f 2247 goto out;
f7b422b1 2248 }
e89a5a43 2249 sb_mntdata.server = server;
f7b422b1 2250
75180df2
TM		 2251 if (server->flags & NFS_MOUNT_UNSHARED)
2252 compare_super = NULL;
2253
fb2088cc
SP		 2254 /* -o noac implies -o sync */
2255 if (server->flags & NFS_MOUNT_NOAC)
2256 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2257
54ceac45 2258 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2259 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2260 if (IS_ERR(s)) {
01194981 2261 mntroot = ERR_CAST(s);
54ceac45 2262 goto out_err_nosb;
816724e6
TM		 2263 }
2264
54ceac45
DH		 2265 if (s->s_fs_info != server) {
2266 nfs_free_server(server);
2267 server = NULL;
fa799759
MS		 2268 } else {
2269 error = nfs_bdi_register(server);
01194981
AV		 2270 if (error) {
2271 mntroot = ERR_PTR(error);
cfbc0683 2272 goto error_splat_bdi;
01194981 2273 }
54ceac45 2274 }
f7b422b1 2275
54ceac45
DH		 2276 if (!s->s_root) {
2277 /* initial superblock/root creation */
33852a1f 2278 nfs_fill_super(s, data);
160bc160 2279 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2280 }
f7b422b1 2281
0d5839ad 2282 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2283 if (IS_ERR(mntroot))
54ceac45 2284 goto error_splat_super;
816724e6 2285
33852a1f 2286 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2287 if (error)
2288 goto error_splat_root;
2289
54ceac45 2290 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2291
2292out:
33852a1f
TM		 2293 kfree(data->nfs_server.hostname);
2294 kfree(data->mount_server.hostname);
08734048 2295 kfree(data->fscache_uniq);
33852a1f
TM		 2296 security_free_mnt_opts(&data->lsm_opts);
2297out_free_fh:
b157b06c 2298 nfs_free_fhandle(mntfh);
33852a1f 2299 kfree(data);
01194981 2300 return mntroot;
816724e6 2301
54ceac45
DH		 2302out_err_nosb:
2303 nfs_free_server(server);
0655960f 2304 goto out;
54ceac45 2305
f9c3a380
EP		 2306error_splat_root:
2307 dput(mntroot);
01194981 2308 mntroot = ERR_PTR(error);
54ceac45 2309error_splat_super:
cfbc0683
N		 2310 if (server && !s->s_root)
2311 bdi_unregister(&server->backing_dev_info);
2312error_splat_bdi:
6f5bbff9 2313 deactivate_locked_super(s);
0655960f 2314 goto out;
f7b422b1
DH		 2315}
2316
387c149b
TM		 2317/*
2318 * Ensure that we unregister the bdi before kill_anon_super
2319 * releases the device name
2320 */
2321static void nfs_put_super(struct super_block *s)
2322{
2323 struct nfs_server *server = NFS_SB(s);
2324
2325 bdi_unregister(&server->backing_dev_info);
2326}
2327
54ceac45
DH		 2328/*
2329 * Destroy an NFS2/3 superblock
2330 */
f7b422b1
DH		 2331static void nfs_kill_super(struct super_block *s)
2332{
2333 struct nfs_server *server = NFS_SB(s);
2334
2335 kill_anon_super(s);
08734048 2336 nfs_fscache_release_super_cookie(s);
54ceac45 2337 nfs_free_server(server);
f7b422b1
DH		 2338}
2339
54ceac45
DH		 2340/*
2341 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2342 */
31f43471
AV		 2343static struct dentry *
2344nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2345 const char *dev_name, void *raw_data)
f7b422b1
DH		 2346{
2347 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2348 struct super_block *s;
2349 struct nfs_server *server;
2350 struct dentry *mntroot;
75180df2 2351 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2352 struct nfs_sb_mountdata sb_mntdata = {
2353 .mntflags = flags,
2354 };
54ceac45 2355 int error;
f7b422b1 2356
31f43471 2357 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2358
54ceac45
DH		 2359 /* create a new volume representation */
2360 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2361 if (IS_ERR(server)) {
2362 error = PTR_ERR(server);
2363 goto out_err_noserver;
2364 }
e89a5a43 2365 sb_mntdata.server = server;
8fa5c000 2366
75180df2
TM		 2367 if (server->flags & NFS_MOUNT_UNSHARED)
2368 compare_super = NULL;
2369
fb2088cc
SP		 2370 /* -o noac implies -o sync */
2371 if (server->flags & NFS_MOUNT_NOAC)
2372 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2373
54ceac45 2374 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2375 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2376 if (IS_ERR(s)) {
2377 error = PTR_ERR(s);
2378 goto out_err_nosb;
2379 }
5006a76c 2380
54ceac45
DH		 2381 if (s->s_fs_info != server) {
2382 nfs_free_server(server);
2383 server = NULL;
fa799759
MS		 2384 } else {
2385 error = nfs_bdi_register(server);
2386 if (error)
cfbc0683 2387 goto error_splat_bdi;
f7b422b1 2388 }
24c8dbbb 2389
54ceac45
DH		 2390 if (!s->s_root) {
2391 /* initial superblock/root creation */
54ceac45 2392 nfs_clone_super(s, data->sb);
2df54806 2393 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2394 }
f7b422b1 2395
0d5839ad 2396 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2397 if (IS_ERR(mntroot)) {
2398 error = PTR_ERR(mntroot);
2399 goto error_splat_super;
f7b422b1 2400 }
e9cc6c23 2401 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2402 dput(mntroot);
2403 error = -ESTALE;
2404 goto error_splat_super;
2405 }
f7b422b1 2406
54ceac45 2407 s->s_flags |= MS_ACTIVE;
f7b422b1 2408
f9c3a380
EP		 2409 /* clone any lsm security options from the parent to the new sb */
2410 security_sb_clone_mnt_opts(data->sb, s);
2411
31f43471
AV		 2412 dprintk("<-- nfs_xdev_mount() = 0\n");
2413 return mntroot;
24c8dbbb 2414
54ceac45
DH		 2415out_err_nosb:
2416 nfs_free_server(server);
2417out_err_noserver:
31f43471
AV		 2418 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2419 return ERR_PTR(error);
f7b422b1 2420
54ceac45 2421error_splat_super:
cfbc0683
N		 2422 if (server && !s->s_root)
2423 bdi_unregister(&server->backing_dev_info);
2424error_splat_bdi:
6f5bbff9 2425 deactivate_locked_super(s);
31f43471
AV		 2426 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2427 return ERR_PTR(error);
f7b422b1
DH		 2428}
2429
54ceac45
DH		 2430#ifdef CONFIG_NFS_V4
2431
f7b422b1 2432/*
54ceac45 2433 * Finish setting up a cloned NFS4 superblock
f7b422b1 2434 */
54ceac45
DH		 2435static void nfs4_clone_super(struct super_block *sb,
2436 const struct super_block *old_sb)
f7b422b1 2437{
54ceac45
DH		 2438 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2439 sb->s_blocksize = old_sb->s_blocksize;
2440 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2441 sb->s_time_gran = 1;
54ceac45 2442 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2443 /*
2444 * The VFS shouldn't apply the umask to mode bits. We will do
2445 * so ourselves when necessary.
2446 */
2447 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2448 sb->s_xattr = old_sb->s_xattr;
2449 nfs_initialise_sb(sb);
f7b422b1
DH		 2450}
2451
54ceac45
DH		 2452/*
2453 * Set up an NFS4 superblock
2454 */
2455static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2456{
54ceac45
DH		 2457 sb->s_time_gran = 1;
2458 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2459 /*
2460 * The VFS shouldn't apply the umask to mode bits. We will do
2461 * so ourselves when necessary.
2462 */
2463 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2464 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2465 nfs_initialise_sb(sb);
f7b422b1
DH		 2466}
2467
01c3f052
TM		 2468static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2469{
5eebde23
SJ		 2470 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2471 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2472}
2473
7630c852
CL		 2474static int nfs4_validate_text_mount_data(void *options,
2475 struct nfs_parsed_mount_data *args,
2476 const char *dev_name)
2477{
2478 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2479
f5855fec 2480 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2481
2482 nfs_validate_transport_protocol(args);
2483
2484 nfs4_validate_mount_flags(args);
2485
2ecda72b
TM		 2486 if (args->version != 4) {
2487 dfprintk(MOUNT,
2488 "NFS4: Illegal mount version\n");
2489 return -EINVAL;
2490 }
2491
7630c852
CL		 2492 if (args->auth_flavor_len > 1) {
2493 dfprintk(MOUNT,
2494 "NFS4: Too many RPC auth flavours specified\n");
2495 return -EINVAL;
2496 }
2497
2498 if (args->client_address == NULL) {
2499 dfprintk(MOUNT,
2500 "NFS4: mount program didn't pass callback address\n");
2501 return -EINVAL;
2502 }
2503
2504 return nfs_parse_devname(dev_name,
2505 &args->nfs_server.hostname,
2506 NFS4_MAXNAMLEN,
2507 &args->nfs_server.export_path,
2508 NFS4_MAXPATHLEN);
2509}
2510
f0768ebd
CL		 2511/*
2512 * Validate NFSv4 mount options
2513 */
91ea40b9
TT		 2514static int nfs4_validate_mount_data(void *options,
2515 struct nfs_parsed_mount_data *args,
2516 const char *dev_name)
f0768ebd 2517{
4cfd74fc 2518 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2519 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2520 char *c;
2521
2522 if (data == NULL)
2523 goto out_no_data;
2524
2525 switch (data->version) {
2526 case 1:
4c568017
CL		 2527 if (data->host_addrlen > sizeof(args->nfs_server.address))
2528 goto out_no_address;
2529 if (data->host_addrlen == 0)
f0768ebd 2530 goto out_no_address;
4c568017 2531 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2532 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2533 return -EFAULT;
4cfd74fc 2534 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2535 goto out_no_address;
2536
6738b251
CL		 2537 if (data->auth_flavourlen) {
2538 if (data->auth_flavourlen > 1)
2539 goto out_inval_auth;
20c71f5e 2540 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2541 data->auth_flavours,
20c71f5e 2542 sizeof(args->auth_flavors[0])))
f0768ebd 2543 return -EFAULT;
f0768ebd
CL		 2544 }
2545
2546 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2547 if (IS_ERR(c))
2548 return PTR_ERR(c);
91ea40b9 2549 args->nfs_server.hostname = c;
f0768ebd
CL		 2550
2551 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2552 if (IS_ERR(c))
2553 return PTR_ERR(c);
91ea40b9
TT		 2554 args->nfs_server.export_path = c;
2555 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2556
2557 c = strndup_user(data->client_addr.data, 16);
2558 if (IS_ERR(c))
2559 return PTR_ERR(c);
91ea40b9
TT		 2560 args->client_address = c;
2561
2562 /*
2563 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2564 * can deal with.
2565 */
2566
2567 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2568 args->rsize = data->rsize;
2569 args->wsize = data->wsize;
2570 args->timeo = data->timeo;
2571 args->retrans = data->retrans;
2572 args->acregmin = data->acregmin;
2573 args->acregmax = data->acregmax;
2574 args->acdirmin = data->acdirmin;
2575 args->acdirmax = data->acdirmax;
2576 args->nfs_server.protocol = data->proto;
259875ef 2577 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2578
2579 break;
7630c852 2580 default:
91ea40b9 2581 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2582 return -EINVAL;
2583
4cfd74fc 2584 if (!nfs_verify_server_address(sap))
80071225 2585 return -EINVAL;
dc045898 2586
7630c852 2587 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2588 }
2589
2590 return 0;
2591
2592out_no_data:
2593 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2594 return -EINVAL;
2595
2596out_inval_auth:
2597 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2598 data->auth_flavourlen);
2599 return -EINVAL;
2600
2601out_no_address:
2602 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2603 return -EINVAL;
f0768ebd
CL		 2604}
2605
54ceac45 2606/*
c02d7adf 2607 * Get the superblock for the NFS4 root partition
54ceac45 2608 */
31f43471
AV		 2609static struct dentry *
2610nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2611 const char *dev_name, void *raw_data)
f7b422b1 2612{
c02d7adf 2613 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2614 struct super_block *s;
2615 struct nfs_server *server;
33852a1f 2616 struct nfs_fh *mntfh;
54ceac45 2617 struct dentry *mntroot;
75180df2 2618 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2619 struct nfs_sb_mountdata sb_mntdata = {
2620 .mntflags = flags,
2621 };
33852a1f
TM		 2622 int error = -ENOMEM;
2623
b157b06c 2624 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2625 if (data == NULL || mntfh == NULL)
2626 goto out_free_fh;
f7b422b1 2627
33852a1f 2628 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2629
54ceac45 2630 /* Get a volume representation */
33852a1f 2631 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2632 if (IS_ERR(server)) {
2633 error = PTR_ERR(server);
29eb981a 2634 goto out;
f7b422b1 2635 }
e89a5a43 2636 sb_mntdata.server = server;
f7b422b1 2637
75180df2
TM		 2638 if (server->flags & NFS4_MOUNT_UNSHARED)
2639 compare_super = NULL;
2640
fb2088cc
SP		 2641 /* -o noac implies -o sync */
2642 if (server->flags & NFS_MOUNT_NOAC)
2643 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2644
54ceac45 2645 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2646 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2647 if (IS_ERR(s)) {
2648 error = PTR_ERR(s);
f7b422b1 2649 goto out_free;
816724e6
TM		 2650 }
2651
5dd3177a
TM		 2652 if (s->s_fs_info != server) {
2653 nfs_free_server(server);
2654 server = NULL;
fa799759
MS		 2655 } else {
2656 error = nfs_bdi_register(server);
2657 if (error)
cfbc0683 2658 goto error_splat_bdi;
5dd3177a
TM		 2659 }
2660
54ceac45
DH		 2661 if (!s->s_root) {
2662 /* initial superblock/root creation */
54ceac45 2663 nfs4_fill_super(s);
2df54806
DH		 2664 nfs_fscache_get_super_cookie(
2665 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2666 }
f7b422b1 2667
0d5839ad 2668 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2669 if (IS_ERR(mntroot)) {
2670 error = PTR_ERR(mntroot);
2671 goto error_splat_super;
f7b422b1 2672 }
54ceac45 2673
33852a1f 2674 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2675 if (error)
2676 goto error_splat_root;
2677
f7b422b1 2678 s->s_flags |= MS_ACTIVE;
31f43471
AV		 2679
2680 security_free_mnt_opts(&data->lsm_opts);
2681 nfs_free_fhandle(mntfh);
2682 return mntroot;
29eb981a
CL		 2683
2684out:
33852a1f
TM		 2685 security_free_mnt_opts(&data->lsm_opts);
2686out_free_fh:
b157b06c 2687 nfs_free_fhandle(mntfh);
31f43471 2688 return ERR_PTR(error);
54ceac45 2689
f7b422b1 2690out_free:
54ceac45 2691 nfs_free_server(server);
29eb981a 2692 goto out;
54ceac45 2693
46c8ac74
EP		 2694error_splat_root:
2695 dput(mntroot);
54ceac45 2696error_splat_super:
cfbc0683
N		 2697 if (server && !s->s_root)
2698 bdi_unregister(&server->backing_dev_info);
2699error_splat_bdi:
6f5bbff9 2700 deactivate_locked_super(s);
29eb981a 2701 goto out;
f7b422b1
DH		 2702}
2703
c02d7adf
TM		 2704static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2705 int flags, void *data, const char *hostname)
2706{
2707 struct vfsmount *root_mnt;
2708 char *root_devname;
2709 size_t len;
2710
2711 len = strlen(hostname) + 3;
2712 root_devname = kmalloc(len, GFP_KERNEL);
2713 if (root_devname == NULL)
2714 return ERR_PTR(-ENOMEM);
2715 snprintf(root_devname, len, "%s:/", hostname);
2716 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2717 kfree(root_devname);
2718 return root_mnt;
2719}
2720
ce587e07
TM		 2721struct nfs_referral_count {
2722 struct list_head list;
2723 const struct task_struct *task;
2724 unsigned int referral_count;
2725};
2726
2727static LIST_HEAD(nfs_referral_count_list);
2728static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2729
2730static struct nfs_referral_count *nfs_find_referral_count(void)
2731{
2732 struct nfs_referral_count *p;
2733
2734 list_for_each_entry(p, &nfs_referral_count_list, list) {
2735 if (p->task == current)
2736 return p;
2737 }
2738 return NULL;
2739}
2740
2741#define NFS_MAX_NESTED_REFERRALS 2
2742
2743static int nfs_referral_loop_protect(void)
2744{
2745 struct nfs_referral_count *p, *new;
2746 int ret = -ENOMEM;
2747
2748 new = kmalloc(sizeof(*new), GFP_KERNEL);
2749 if (!new)
2750 goto out;
2751 new->task = current;
2752 new->referral_count = 1;
2753
2754 ret = 0;
2755 spin_lock(&nfs_referral_count_list_lock);
2756 p = nfs_find_referral_count();
2757 if (p != NULL) {
2758 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2759 ret = -ELOOP;
2760 else
2761 p->referral_count++;
2762 } else {
2763 list_add(&new->list, &nfs_referral_count_list);
2764 new = NULL;
2765 }
2766 spin_unlock(&nfs_referral_count_list_lock);
2767 kfree(new);
2768out:
2769 return ret;
2770}
2771
2772static void nfs_referral_loop_unprotect(void)
2773{
2774 struct nfs_referral_count *p;
2775
2776 spin_lock(&nfs_referral_count_list_lock);
2777 p = nfs_find_referral_count();
2778 p->referral_count--;
2779 if (p->referral_count == 0)
2780 list_del(&p->list);
2781 else
2782 p = NULL;
2783 spin_unlock(&nfs_referral_count_list_lock);
2784 kfree(p);
2785}
2786
01194981
AV		 2787static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2788 const char *export_path)
c02d7adf 2789{
01194981 2790 struct dentry *dentry;
ea441d11 2791 int ret = nfs_referral_loop_protect();
c02d7adf 2792
ea441d11
AV		 2793 if (ret) {
2794 mntput(root_mnt);
c1334495 2795 return ERR_PTR(ret);
ea441d11 2796 }
c02d7adf 2797
ea441d11
AV		 2798 dentry = mount_subtree(root_mnt, export_path);
2799 nfs_referral_loop_unprotect();
c02d7adf 2800
01194981 2801 return dentry;
c02d7adf
TM		 2802}
2803
01194981
AV		 2804static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2805 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2806{
2807 char *export_path;
2808 struct vfsmount *root_mnt;
01194981 2809 struct dentry *res;
a6fe23be
CL		 2810
2811 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2812
2813 export_path = data->nfs_server.export_path;
2814 data->nfs_server.export_path = "/";
2815 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2816 data->nfs_server.hostname);
2817 data->nfs_server.export_path = export_path;
2818
01194981
AV		 2819 res = ERR_CAST(root_mnt);
2820 if (!IS_ERR(root_mnt))
2821 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2822
01194981
AV		 2823 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2824 IS_ERR(res) ? PTR_ERR(res) : 0,
2825 IS_ERR(res) ? " [error]" : "");
2826 return res;
a6fe23be
CL		 2827}
2828
c02d7adf
TM		 2829/*
2830 * Get the superblock for an NFS4 mountpoint
2831 */
01194981
AV		 2832static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2833 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2834{
2835 struct nfs_parsed_mount_data *data;
c02d7adf 2836 int error = -ENOMEM;
01194981 2837 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2838
c5811dbd 2839 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2840 if (data == NULL)
2841 goto out_free_data;
2842
2843 /* Validate the mount data */
2844 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2845 if (error < 0) {
2846 res = ERR_PTR(error);
c02d7adf 2847 goto out;
01194981 2848 }
c02d7adf 2849
01194981
AV		 2850 res = nfs4_try_mount(flags, dev_name, data);
2851 if (IS_ERR(res))
2852 error = PTR_ERR(res);
c02d7adf
TM		 2853
2854out:
2855 kfree(data->client_address);
2856 kfree(data->nfs_server.export_path);
2857 kfree(data->nfs_server.hostname);
2858 kfree(data->fscache_uniq);
2859out_free_data:
2860 kfree(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
01194981
AV		 3082 res = ERR_CAST(root_mnt);
3083 if (!IS_ERR(root_mnt))
3084 res = nfs_follow_remote_path(root_mnt, export_path);
3085 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3086 IS_ERR(res) ? PTR_ERR(res) : 0,
3087 IS_ERR(res) ? " [error]" : "");
3088 return res;
c02d7adf
TM		 3089}
3090
54ceac45 3091#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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