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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[net-next-2.6.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>
42#include <linux/smp_lock.h>
43#include <linux/seq_file.h>
44#include <linux/mount.h>
c02d7adf
TM		 45#include <linux/mnt_namespace.h>
46#include <linux/namei.h>
f7b422b1
DH		 47#include <linux/nfs_idmap.h>
48#include <linux/vfs.h>
49#include <linux/inet.h>
fd00a8ff 50#include <linux/in6.h>
5a0e3ad6 51#include <linux/slab.h>
fd00a8ff 52#include <net/ipv6.h>
d8e7748a 53#include <linux/netdevice.h>
f7b422b1 54#include <linux/nfs_xdr.h>
b5d5dfbd 55#include <linux/magic.h>
bf0fd768 56#include <linux/parser.h>
f7b422b1
DH		 57
58#include <asm/system.h>
59#include <asm/uaccess.h>
60
61#include "nfs4_fs.h"
62#include "callback.h"
63#include "delegation.h"
64#include "iostat.h"
65#include "internal.h"
08734048 66#include "fscache.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
69
bf0fd768
CL		 70enum {
71 /* Mount options that take no arguments */
72 Opt_soft, Opt_hard,
bf0fd768
CL		 73 Opt_posix, Opt_noposix,
74 Opt_cto, Opt_nocto,
75 Opt_ac, Opt_noac,
76 Opt_lock, Opt_nolock,
764302cc 77 Opt_v2, Opt_v3, Opt_v4,
2cf7ff7a 78 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 79 Opt_acl, Opt_noacl,
80 Opt_rdirplus, Opt_nordirplus,
75180df2 81 Opt_sharecache, Opt_nosharecache,
d740351b 82 Opt_resvport, Opt_noresvport,
b797cac7 83 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 84
85 /* Mount options that take integer arguments */
86 Opt_port,
87 Opt_rsize, Opt_wsize, Opt_bsize,
88 Opt_timeo, Opt_retrans,
89 Opt_acregmin, Opt_acregmax,
90 Opt_acdirmin, Opt_acdirmax,
91 Opt_actimeo,
92 Opt_namelen,
93 Opt_mountport,
e887cbcf 94 Opt_mountvers,
ad879cef 95 Opt_nfsvers,
3fd5be9e 96 Opt_minorversion,
bf0fd768
CL		 97
98 /* Mount options that take string arguments */
33832034 99 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 100 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 101 Opt_lookupcache,
b797cac7 102 Opt_fscache_uniq,
bf0fd768 103
f45663ce
CL		 104 /* Special mount options */
105 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 106
107 Opt_err
108};
109
a447c093 110static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 111 { Opt_userspace, "bg" },
112 { Opt_userspace, "fg" },
ecbb3845
CL		 113 { Opt_userspace, "retry=%s" },
114
f45663ce
CL		 115 { Opt_sloppy, "sloppy" },
116
bf0fd768
CL		 117 { Opt_soft, "soft" },
118 { Opt_hard, "hard" },
d33e4dfe
CL		 119 { Opt_deprecated, "intr" },
120 { Opt_deprecated, "nointr" },
bf0fd768
CL		 121 { Opt_posix, "posix" },
122 { Opt_noposix, "noposix" },
123 { Opt_cto, "cto" },
124 { Opt_nocto, "nocto" },
125 { Opt_ac, "ac" },
126 { Opt_noac, "noac" },
127 { Opt_lock, "lock" },
128 { Opt_nolock, "nolock" },
129 { Opt_v2, "v2" },
130 { Opt_v3, "v3" },
764302cc 131 { Opt_v4, "v4" },
bf0fd768
CL		 132 { Opt_udp, "udp" },
133 { Opt_tcp, "tcp" },
2cf7ff7a 134 { Opt_rdma, "rdma" },
bf0fd768
CL		 135 { Opt_acl, "acl" },
136 { Opt_noacl, "noacl" },
137 { Opt_rdirplus, "rdirplus" },
138 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 139 { Opt_sharecache, "sharecache" },
140 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 141 { Opt_resvport, "resvport" },
142 { Opt_noresvport, "noresvport" },
b797cac7 143 { Opt_fscache, "fsc" },
b797cac7 144 { Opt_nofscache, "nofsc" },
bf0fd768 145
a5a16bae
CL		 146 { Opt_port, "port=%s" },
147 { Opt_rsize, "rsize=%s" },
148 { Opt_wsize, "wsize=%s" },
149 { Opt_bsize, "bsize=%s" },
150 { Opt_timeo, "timeo=%s" },
151 { Opt_retrans, "retrans=%s" },
152 { Opt_acregmin, "acregmin=%s" },
153 { Opt_acregmax, "acregmax=%s" },
154 { Opt_acdirmin, "acdirmin=%s" },
155 { Opt_acdirmax, "acdirmax=%s" },
156 { Opt_actimeo, "actimeo=%s" },
157 { Opt_namelen, "namlen=%s" },
158 { Opt_mountport, "mountport=%s" },
159 { Opt_mountvers, "mountvers=%s" },
160 { Opt_nfsvers, "nfsvers=%s" },
161 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 162 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 163
164 { Opt_sec, "sec=%s" },
165 { Opt_proto, "proto=%s" },
166 { Opt_mountproto, "mountproto=%s" },
167 { Opt_addr, "addr=%s" },
168 { Opt_clientaddr, "clientaddr=%s" },
33832034 169 { Opt_mounthost, "mounthost=%s" },
0ac83779 170 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 171
7973c1f1 172 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 173 { Opt_fscache_uniq, "fsc=%s" },
7973c1f1 174
bf0fd768
CL		 175 { Opt_err, NULL }
176};
177
178enum {
ee671b01 179 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 180
181 Opt_xprt_err
182};
183
a447c093 184static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 185 { Opt_xprt_udp, "udp" },
ee671b01 186 { Opt_xprt_udp6, "udp6" },
bf0fd768 187 { Opt_xprt_tcp, "tcp" },
ee671b01 188 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 189 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 190
191 { Opt_xprt_err, NULL }
192};
193
194enum {
195 Opt_sec_none, Opt_sec_sys,
196 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
197 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
198 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
199
200 Opt_sec_err
201};
202
a447c093 203static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 204 { Opt_sec_none, "none" },
205 { Opt_sec_none, "null" },
206 { Opt_sec_sys, "sys" },
207
208 { Opt_sec_krb5, "krb5" },
209 { Opt_sec_krb5i, "krb5i" },
210 { Opt_sec_krb5p, "krb5p" },
211
212 { Opt_sec_lkey, "lkey" },
213 { Opt_sec_lkeyi, "lkeyi" },
214 { Opt_sec_lkeyp, "lkeyp" },
215
8d042218
OK		 216 { Opt_sec_spkm, "spkm3" },
217 { Opt_sec_spkmi, "spkm3i" },
218 { Opt_sec_spkmp, "spkm3p" },
219
bf0fd768
CL		 220 { Opt_sec_err, NULL }
221};
222
7973c1f1
TM		 223enum {
224 Opt_lookupcache_all, Opt_lookupcache_positive,
225 Opt_lookupcache_none,
226
227 Opt_lookupcache_err
228};
229
230static match_table_t nfs_lookupcache_tokens = {
231 { Opt_lookupcache_all, "all" },
232 { Opt_lookupcache_positive, "pos" },
233 { Opt_lookupcache_positive, "positive" },
234 { Opt_lookupcache_none, "none" },
235
236 { Opt_lookupcache_err, NULL }
237};
238
bf0fd768 239
42faad99 240static void nfs_umount_begin(struct super_block *);
816724e6 241static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 242static int nfs_show_options(struct seq_file *, struct vfsmount *);
243static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 244static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 245static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
387c149b 247static void nfs_put_super(struct super_block *);
f7b422b1 248static void nfs_kill_super(struct super_block *);
48b605f8 249static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 250
251static struct file_system_type nfs_fs_type = {
252 .owner = THIS_MODULE,
253 .name = "nfs",
254 .get_sb = nfs_get_sb,
255 .kill_sb = nfs_kill_super,
349457cc 256 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 257};
258
54ceac45 259struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 260 .owner = THIS_MODULE,
261 .name = "nfs",
54ceac45 262 .get_sb = nfs_xdev_get_sb,
f7b422b1 263 .kill_sb = nfs_kill_super,
349457cc 264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 265};
266
ee9b6d61 267static const struct super_operations nfs_sops = {
f7b422b1
DH		 268 .alloc_inode = nfs_alloc_inode,
269 .destroy_inode = nfs_destroy_inode,
270 .write_inode = nfs_write_inode,
387c149b 271 .put_super = nfs_put_super,
f7b422b1 272 .statfs = nfs_statfs,
b57922d9 273 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 274 .umount_begin = nfs_umount_begin,
275 .show_options = nfs_show_options,
276 .show_stats = nfs_show_stats,
48b605f8 277 .remount_fs = nfs_remount,
f7b422b1
DH		 278};
279
280#ifdef CONFIG_NFS_V4
7630c852
CL		 281static int nfs4_validate_text_mount_data(void *options,
282 struct nfs_parsed_mount_data *args, const char *dev_name);
a6fe23be
CL		 283static int nfs4_try_mount(int flags, const char *dev_name,
284 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
816724e6
TM		 285static int nfs4_get_sb(struct file_system_type *fs_type,
286 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 287static int nfs4_remote_get_sb(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 289static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
290 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
291static int nfs4_referral_get_sb(struct file_system_type *fs_type,
292 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 293static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
294 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 295static void nfs4_kill_super(struct super_block *sb);
296
297static struct file_system_type nfs4_fs_type = {
298 .owner = THIS_MODULE,
299 .name = "nfs4",
300 .get_sb = nfs4_get_sb,
301 .kill_sb = nfs4_kill_super,
349457cc 302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 303};
304
c02d7adf
TM		 305static struct file_system_type nfs4_remote_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs4",
308 .get_sb = nfs4_remote_get_sb,
309 .kill_sb = nfs4_kill_super,
310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
311};
312
54ceac45 313struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 314 .owner = THIS_MODULE,
315 .name = "nfs4",
54ceac45 316 .get_sb = nfs4_xdev_get_sb,
f7b422b1 317 .kill_sb = nfs4_kill_super,
349457cc 318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 319};
320
c02d7adf
TM		 321static struct file_system_type nfs4_remote_referral_fs_type = {
322 .owner = THIS_MODULE,
323 .name = "nfs4",
324 .get_sb = nfs4_remote_referral_get_sb,
325 .kill_sb = nfs4_kill_super,
326 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
327};
328
54ceac45 329struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 330 .owner = THIS_MODULE,
331 .name = "nfs4",
54ceac45 332 .get_sb = nfs4_referral_get_sb,
f7b422b1 333 .kill_sb = nfs4_kill_super,
349457cc 334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 335};
336
ee9b6d61 337static const struct super_operations nfs4_sops = {
f7b422b1
DH		 338 .alloc_inode = nfs_alloc_inode,
339 .destroy_inode = nfs_destroy_inode,
340 .write_inode = nfs_write_inode,
387c149b 341 .put_super = nfs_put_super,
f7b422b1 342 .statfs = nfs_statfs,
b57922d9 343 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 344 .umount_begin = nfs_umount_begin,
345 .show_options = nfs_show_options,
346 .show_stats = nfs_show_stats,
48b605f8 347 .remount_fs = nfs_remount,
f7b422b1
DH		 348};
349#endif
350
8e1f936b
RR		 351static struct shrinker acl_shrinker = {
352 .shrink = nfs_access_cache_shrinker,
353 .seeks = DEFAULT_SEEKS,
354};
979df72e 355
f7b422b1
DH		 356/*
357 * Register the NFS filesystems
358 */
359int __init register_nfs_fs(void)
360{
361 int ret;
362
363 ret = register_filesystem(&nfs_fs_type);
364 if (ret < 0)
365 goto error_0;
366
f7b422b1
DH		 367 ret = nfs_register_sysctl();
368 if (ret < 0)
369 goto error_1;
89a09141 370#ifdef CONFIG_NFS_V4
f7b422b1
DH		 371 ret = register_filesystem(&nfs4_fs_type);
372 if (ret < 0)
373 goto error_2;
374#endif
8e1f936b 375 register_shrinker(&acl_shrinker);
f7b422b1
DH		 376 return 0;
377
378#ifdef CONFIG_NFS_V4
379error_2:
380 nfs_unregister_sysctl();
89a09141 381#endif
f7b422b1
DH		 382error_1:
383 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 384error_0:
385 return ret;
386}
387
388/*
389 * Unregister the NFS filesystems
390 */
391void __exit unregister_nfs_fs(void)
392{
8e1f936b 393 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 394#ifdef CONFIG_NFS_V4
395 unregister_filesystem(&nfs4_fs_type);
f7b422b1 396#endif
49af7ee1 397 nfs_unregister_sysctl();
f7b422b1
DH		 398 unregister_filesystem(&nfs_fs_type);
399}
400
1daef0a8 401void nfs_sb_active(struct super_block *sb)
ef818a28 402{
1daef0a8 403 struct nfs_server *server = NFS_SB(sb);
ef818a28 404
1daef0a8
TM		 405 if (atomic_inc_return(&server->active) == 1)
406 atomic_inc(&sb->s_active);
ef818a28
SD		 407}
408
1daef0a8 409void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 410{
411 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 412
413 if (atomic_dec_and_test(&server->active))
414 deactivate_super(sb);
ef818a28
SD		 415}
416
f7b422b1
DH		 417/*
418 * Deliver file system statistics to userspace
419 */
816724e6 420static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 421{
0c7d90cf 422 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 423 unsigned char blockbits;
424 unsigned long blockres;
0c7d90cf 425 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 426 struct nfs_fsstat res;
427 int error = -ENOMEM;
428
429 res.fattr = nfs_alloc_fattr();
430 if (res.fattr == NULL)
431 goto out_err;
f7b422b1 432
8fa5c000 433 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
ca7e9a0d
TM		 434
435 nfs_free_fattr(res.fattr);
f7b422b1
DH		 436 if (error < 0)
437 goto out_err;
ca7e9a0d 438
1a0ba9ae 439 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 440
441 /*
442 * Current versions of glibc do not correctly handle the
443 * case where f_frsize != f_bsize. Eventually we want to
444 * report the value of wtmult in this field.
445 */
0c7d90cf 446 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 447
448 /*
449 * On most *nix systems, f_blocks, f_bfree, and f_bavail
450 * are reported in units of f_frsize. Linux hasn't had
451 * an f_frsize field in its statfs struct until recently,
452 * thus historically Linux's sys_statfs reports these
453 * fields in units of f_bsize.
454 */
0c7d90cf
DH		 455 buf->f_bsize = dentry->d_sb->s_blocksize;
456 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 457 blockres = (1 << blockbits) - 1;
458 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
459 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
460 buf->f_bavail = (res.abytes + blockres) >> blockbits;
461
462 buf->f_files = res.tfiles;
463 buf->f_ffree = res.afiles;
464
465 buf->f_namelen = server->namelen;
1a0ba9ae 466
f7b422b1
DH		 467 return 0;
468
469 out_err:
3110ff80 470 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 471 return error;
f7b422b1
DH		 472}
473
7d4e2747
DH		 474/*
475 * Map the security flavour number to a name
476 */
81039f1f
TM		 477static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
478{
7d4e2747 479 static const struct {
81039f1f
TM		 480 rpc_authflavor_t flavour;
481 const char *str;
482 } sec_flavours[] = {
483 { RPC_AUTH_NULL, "null" },
484 { RPC_AUTH_UNIX, "sys" },
485 { RPC_AUTH_GSS_KRB5, "krb5" },
486 { RPC_AUTH_GSS_KRB5I, "krb5i" },
487 { RPC_AUTH_GSS_KRB5P, "krb5p" },
488 { RPC_AUTH_GSS_LKEY, "lkey" },
489 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
490 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
491 { RPC_AUTH_GSS_SPKM, "spkm" },
492 { RPC_AUTH_GSS_SPKMI, "spkmi" },
493 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 494 { UINT_MAX, "unknown" }
81039f1f
TM		 495 };
496 int i;
497
4d81cd16 498 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 499 if (sec_flavours[i].flavour == flavour)
500 break;
501 }
502 return sec_flavours[i].str;
503}
504
ee671b01
JL		 505static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
506 int showdefaults)
507{
508 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
509
510 seq_printf(m, ",mountproto=");
511 switch (sap->sa_family) {
512 case AF_INET:
513 switch (nfss->mountd_protocol) {
514 case IPPROTO_UDP:
515 seq_printf(m, RPCBIND_NETID_UDP);
516 break;
517 case IPPROTO_TCP:
518 seq_printf(m, RPCBIND_NETID_TCP);
519 break;
520 default:
521 if (showdefaults)
522 seq_printf(m, "auto");
523 }
524 break;
525 case AF_INET6:
526 switch (nfss->mountd_protocol) {
527 case IPPROTO_UDP:
528 seq_printf(m, RPCBIND_NETID_UDP6);
529 break;
530 case IPPROTO_TCP:
531 seq_printf(m, RPCBIND_NETID_TCP6);
532 break;
533 default:
534 if (showdefaults)
535 seq_printf(m, "auto");
536 }
537 break;
538 default:
539 if (showdefaults)
540 seq_printf(m, "auto");
541 }
542}
543
82d101d5
CL		 544static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546{
547 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
548
d5eff1a3
BS		 549 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
550 return;
551
82d101d5
CL		 552 switch (sap->sa_family) {
553 case AF_INET: {
554 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 555 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 556 break;
557 }
558 case AF_INET6: {
559 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 560 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 561 break;
562 }
563 default:
564 if (showdefaults)
565 seq_printf(m, ",mountaddr=unspecified");
566 }
567
568 if (nfss->mountd_version || showdefaults)
569 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
570 if (nfss->mountd_port || showdefaults)
571 seq_printf(m, ",mountport=%u", nfss->mountd_port);
572
ee671b01 573 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 574}
575
0be8189f
TM		 576#ifdef CONFIG_NFS_V4
577static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
578 int showdefaults)
579{
580 struct nfs_client *clp = nfss->nfs_client;
581
582 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
583 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
584}
585#else
586static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
587 int showdefaults)
588{
589}
590#endif
591
f7b422b1
DH		 592/*
593 * Describe the mount options in force on this server representation
594 */
82d101d5
CL		 595static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
596 int showdefaults)
f7b422b1 597{
509de811 598 static const struct proc_nfs_info {
f7b422b1 599 int flag;
509de811
DH		 600 const char *str;
601 const char *nostr;
f7b422b1
DH		 602 } nfs_info[] = {
603 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 604 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 605 { NFS_MOUNT_NOCTO, ",nocto", "" },
606 { NFS_MOUNT_NOAC, ",noac", "" },
607 { NFS_MOUNT_NONLM, ",nolock", "" },
608 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 609 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 610 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
611 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 612 { 0, NULL, NULL }
613 };
509de811 614 const struct proc_nfs_info *nfs_infop;
8fa5c000 615 struct nfs_client *clp = nfss->nfs_client;
82d101d5 616 u32 version = clp->rpc_ops->version;
f7b422b1 617
82d101d5 618 seq_printf(m, ",vers=%u", version);
2d767432
CL		 619 seq_printf(m, ",rsize=%u", nfss->rsize);
620 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 621 if (nfss->bsize != 0)
622 seq_printf(m, ",bsize=%u", nfss->bsize);
623 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 624 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 625 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 626 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 627 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 628 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 629 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 630 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 631 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 632 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
633 if (nfss->flags & nfs_infop->flag)
634 seq_puts(m, nfs_infop->str);
635 else
636 seq_puts(m, nfs_infop->nostr);
637 }
56928edd 638 seq_printf(m, ",proto=%s",
ee671b01 639 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 640 if (version == 4) {
641 if (nfss->port != NFS_PORT)
642 seq_printf(m, ",port=%u", nfss->port);
643 } else
644 if (nfss->port)
645 seq_printf(m, ",port=%u", nfss->port);
646
33170233
TM		 647 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
648 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 649 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 650
651 if (version != 4)
652 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 653 else
654 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 655
b797cac7
DH		 656 if (nfss->options & NFS_OPTION_FSCACHE)
657 seq_printf(m, ",fsc");
9b00c643
PL		 658
659 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
660 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
661 seq_printf(m, ",lookupcache=none");
662 else
663 seq_printf(m, ",lookupcache=pos");
664 }
f7b422b1
DH		 665}
666
667/*
668 * Describe the mount options on this VFS mountpoint
669 */
670static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
671{
672 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
673
674 nfs_show_mount_options(m, nfss, 0);
675
5d8515ca
CL		 676 seq_printf(m, ",addr=%s",
677 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
678 RPC_DISPLAY_ADDR));
f7b422b1
DH		 679
680 return 0;
681}
682
683/*
684 * Present statistical information for this VFS mountpoint
685 */
686static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
687{
688 int i, cpu;
689 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
690 struct rpc_auth *auth = nfss->client->cl_auth;
691 struct nfs_iostats totals = { };
692
693 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
694
695 /*
696 * Display all mount option settings
697 */
698 seq_printf(m, "\n\topts:\t");
699 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
700 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
701 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
702 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
703 nfs_show_mount_options(m, nfss, 1);
704
705 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
706
707 seq_printf(m, "\n\tcaps:\t");
708 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 709 seq_printf(m, ",wtmult=%u", nfss->wtmult);
710 seq_printf(m, ",dtsize=%u", nfss->dtsize);
711 seq_printf(m, ",bsize=%u", nfss->bsize);
712 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 713
714#ifdef CONFIG_NFS_V4
40c55319 715 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 716 seq_printf(m, "\n\tnfsv4:\t");
717 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
718 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
719 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
720 }
721#endif
722
723 /*
724 * Display security flavor in effect for this mount
725 */
2d767432 726 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 727 if (auth->au_flavor)
2d767432 728 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 729
730 /*
731 * Display superblock I/O counters
732 */
733 for_each_possible_cpu(cpu) {
734 struct nfs_iostats *stats;
735
736 preempt_disable();
737 stats = per_cpu_ptr(nfss->io_stats, cpu);
738
739 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
740 totals.events[i] += stats->events[i];
741 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
742 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 743#ifdef CONFIG_NFS_FSCACHE
744 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
745 totals.fscache[i] += stats->fscache[i];
746#endif
f7b422b1
DH		 747
748 preempt_enable();
749 }
750
751 seq_printf(m, "\n\tevents:\t");
752 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
753 seq_printf(m, "%lu ", totals.events[i]);
754 seq_printf(m, "\n\tbytes:\t");
755 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
756 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 757#ifdef CONFIG_NFS_FSCACHE
758 if (nfss->options & NFS_OPTION_FSCACHE) {
759 seq_printf(m, "\n\tfsc:\t");
760 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
761 seq_printf(m, "%Lu ", totals.bytes[i]);
762 }
763#endif
f7b422b1
DH		 764 seq_printf(m, "\n");
765
766 rpc_print_iostats(m, nfss->client);
767
768 return 0;
769}
770
771/*
772 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 773 * in response to xdev traversals and referrals
f7b422b1 774 */
42faad99 775static void nfs_umount_begin(struct super_block *sb)
f7b422b1 776{
67e55205 777 struct nfs_server *server;
fc6ae3cf
TM		 778 struct rpc_clnt *rpc;
779
67e55205 780 server = NFS_SB(sb);
fc6ae3cf
TM		 781 /* -EIO all pending I/O */
782 rpc = server->client_acl;
783 if (!IS_ERR(rpc))
784 rpc_killall_tasks(rpc);
785 rpc = server->client;
786 if (!IS_ERR(rpc))
787 rpc_killall_tasks(rpc);
f7b422b1
DH		 788}
789
c5811dbd 790static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 791{
792 struct nfs_parsed_mount_data *data;
793
794 data = kzalloc(sizeof(*data), GFP_KERNEL);
795 if (data) {
9423a08a
CL		 796 data->acregmin = NFS_DEF_ACREGMIN;
797 data->acregmax = NFS_DEF_ACREGMAX;
798 data->acdirmin = NFS_DEF_ACDIRMIN;
799 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 800 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 801 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 802 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 803 data->auth_flavors[0] = RPC_AUTH_UNIX;
804 data->auth_flavor_len = 1;
c5811dbd 805 data->version = version;
9423a08a
CL		 806 data->minorversion = 0;
807 }
808 return data;
809}
810
fc50d58f 811/*
cdcd7f9a
CL		 812 * Sanity-check a server address provided by the mount command.
813 *
814 * Address family must be initialized, and address must not be
815 * the ANY address for that family.
fc50d58f
CL		 816 */
817static int nfs_verify_server_address(struct sockaddr *addr)
818{
819 switch (addr->sa_family) {
820 case AF_INET: {
cdcd7f9a 821 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 822 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 823 }
824 case AF_INET6: {
825 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
826 return !ipv6_addr_any(sa);
fc50d58f
CL		 827 }
828 }
829
53a0b9c4 830 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 831 return 0;
832}
833
4cfd74fc
CL		 834/*
835 * Select between a default port value and a user-specified port value.
836 * If a zero value is set, then autobind will be used.
837 */
f5855fec 838static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 839 const unsigned short default_port)
840{
f5855fec
TM		 841 if (*port == NFS_UNSPEC_PORT)
842 *port = default_port;
4cfd74fc 843
f5855fec 844 rpc_set_port(sap, *port);
4cfd74fc
CL		 845}
846
259875ef
TM		 847/*
848 * Sanity check the NFS transport protocol.
849 *
850 */
851static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
852{
853 switch (mnt->nfs_server.protocol) {
854 case XPRT_TRANSPORT_UDP:
855 case XPRT_TRANSPORT_TCP:
856 case XPRT_TRANSPORT_RDMA:
857 break;
858 default:
859 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
860 }
861}
862
863/*
864 * For text based NFSv2/v3 mounts, the mount protocol transport default
865 * settings should depend upon the specified NFS transport.
866 */
867static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
868{
869 nfs_validate_transport_protocol(mnt);
870
871 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
872 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
873 return;
874 switch (mnt->nfs_server.protocol) {
875 case XPRT_TRANSPORT_UDP:
876 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
877 break;
878 case XPRT_TRANSPORT_TCP:
879 case XPRT_TRANSPORT_RDMA:
880 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
881 }
882}
883
01060c89
CL		 884/*
885 * Parse the value of the 'sec=' option.
01060c89
CL		 886 */
887static int nfs_parse_security_flavors(char *value,
888 struct nfs_parsed_mount_data *mnt)
889{
890 substring_t args[MAX_OPT_ARGS];
891
892 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
893
894 switch (match_token(value, nfs_secflavor_tokens, args)) {
895 case Opt_sec_none:
01060c89
CL		 896 mnt->auth_flavors[0] = RPC_AUTH_NULL;
897 break;
898 case Opt_sec_sys:
01060c89
CL		 899 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
900 break;
901 case Opt_sec_krb5:
01060c89
CL		 902 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
903 break;
904 case Opt_sec_krb5i:
01060c89
CL		 905 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
906 break;
907 case Opt_sec_krb5p:
01060c89
CL		 908 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
909 break;
910 case Opt_sec_lkey:
01060c89
CL		 911 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
912 break;
913 case Opt_sec_lkeyi:
01060c89
CL		 914 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
915 break;
916 case Opt_sec_lkeyp:
01060c89
CL		 917 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
918 break;
919 case Opt_sec_spkm:
01060c89
CL		 920 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
921 break;
922 case Opt_sec_spkmi:
01060c89
CL		 923 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
924 break;
925 case Opt_sec_spkmp:
01060c89
CL		 926 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
927 break;
928 default:
929 return 0;
930 }
931
059f90b3 932 mnt->auth_flavor_len = 1;
01060c89
CL		 933 return 1;
934}
935
bf0fd768
CL		 936/*
937 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 938 * a data structure. The whole mount string is processed; bad options are
939 * skipped as they are encountered. If there were no errors, return 1;
940 * otherwise return 0 (zero).
bf0fd768
CL		 941 */
942static int nfs_parse_mount_options(char *raw,
943 struct nfs_parsed_mount_data *mnt)
944{
f9c3a380 945 char *p, *string, *secdata;
d23c45fd 946 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 947 unsigned short protofamily = AF_UNSPEC;
948 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 949
950 if (!raw) {
951 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
952 return 1;
953 }
954 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
955
f9c3a380
EP		 956 secdata = alloc_secdata();
957 if (!secdata)
958 goto out_nomem;
959
960 rc = security_sb_copy_data(raw, secdata);
961 if (rc)
962 goto out_security_failure;
963
964 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
965 if (rc)
966 goto out_security_failure;
967
968 free_secdata(secdata);
969
bf0fd768
CL		 970 while ((p = strsep(&raw, ",")) != NULL) {
971 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 972 unsigned long option;
973 int token;
bf0fd768
CL		 974
975 if (!*p)
976 continue;
977
978 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
979
980 token = match_token(p, nfs_mount_option_tokens, args);
981 switch (token) {
f45663ce
CL		 982
983 /*
984 * boolean options: foo/nofoo
985 */
bf0fd768
CL		 986 case Opt_soft:
987 mnt->flags |= NFS_MOUNT_SOFT;
988 break;
989 case Opt_hard:
990 mnt->flags &= ~NFS_MOUNT_SOFT;
991 break;
bf0fd768
CL		 992 case Opt_posix:
993 mnt->flags |= NFS_MOUNT_POSIX;
994 break;
995 case Opt_noposix:
996 mnt->flags &= ~NFS_MOUNT_POSIX;
997 break;
998 case Opt_cto:
999 mnt->flags &= ~NFS_MOUNT_NOCTO;
1000 break;
1001 case Opt_nocto:
1002 mnt->flags |= NFS_MOUNT_NOCTO;
1003 break;
1004 case Opt_ac:
1005 mnt->flags &= ~NFS_MOUNT_NOAC;
1006 break;
1007 case Opt_noac:
1008 mnt->flags |= NFS_MOUNT_NOAC;
1009 break;
1010 case Opt_lock:
1011 mnt->flags &= ~NFS_MOUNT_NONLM;
1012 break;
1013 case Opt_nolock:
1014 mnt->flags |= NFS_MOUNT_NONLM;
1015 break;
1016 case Opt_v2:
1017 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1018 mnt->version = 2;
bf0fd768
CL		 1019 break;
1020 case Opt_v3:
1021 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1022 mnt->version = 3;
bf0fd768 1023 break;
764302cc
CL		 1024#ifdef CONFIG_NFS_V4
1025 case Opt_v4:
1026 mnt->flags &= ~NFS_MOUNT_VER3;
1027 mnt->version = 4;
1028 break;
1029#endif
bf0fd768
CL		 1030 case Opt_udp:
1031 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1032 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1033 break;
1034 case Opt_tcp:
1035 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1036 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1037 break;
2cf7ff7a
TT		 1038 case Opt_rdma:
1039 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1040 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1041 xprt_load_transport(p);
2cf7ff7a 1042 break;
bf0fd768
CL		 1043 case Opt_acl:
1044 mnt->flags &= ~NFS_MOUNT_NOACL;
1045 break;
1046 case Opt_noacl:
1047 mnt->flags |= NFS_MOUNT_NOACL;
1048 break;
1049 case Opt_rdirplus:
1050 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1051 break;
1052 case Opt_nordirplus:
1053 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1054 break;
75180df2
TM		 1055 case Opt_sharecache:
1056 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1057 break;
1058 case Opt_nosharecache:
1059 mnt->flags |= NFS_MOUNT_UNSHARED;
1060 break;
d740351b
CL		 1061 case Opt_resvport:
1062 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1063 break;
1064 case Opt_noresvport:
1065 mnt->flags |= NFS_MOUNT_NORESVPORT;
1066 break;
b797cac7
DH		 1067 case Opt_fscache:
1068 mnt->options |= NFS_OPTION_FSCACHE;
1069 kfree(mnt->fscache_uniq);
1070 mnt->fscache_uniq = NULL;
1071 break;
1072 case Opt_nofscache:
1073 mnt->options &= ~NFS_OPTION_FSCACHE;
1074 kfree(mnt->fscache_uniq);
1075 mnt->fscache_uniq = NULL;
1076 break;
bf0fd768 1077
f45663ce
CL		 1078 /*
1079 * options that take numeric values
1080 */
bf0fd768 1081 case Opt_port:
a5a16bae
CL		 1082 string = match_strdup(args);
1083 if (string == NULL)
1084 goto out_nomem;
1085 rc = strict_strtoul(string, 10, &option);
1086 kfree(string);
4be929be 1087 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1088 goto out_invalid_value;
1089 mnt->nfs_server.port = option;
bf0fd768
CL		 1090 break;
1091 case Opt_rsize:
a5a16bae
CL		 1092 string = match_strdup(args);
1093 if (string == NULL)
1094 goto out_nomem;
1095 rc = strict_strtoul(string, 10, &option);
1096 kfree(string);
1097 if (rc != 0)
d23c45fd
CL		 1098 goto out_invalid_value;
1099 mnt->rsize = option;
bf0fd768
CL		 1100 break;
1101 case Opt_wsize:
a5a16bae
CL		 1102 string = match_strdup(args);
1103 if (string == NULL)
1104 goto out_nomem;
1105 rc = strict_strtoul(string, 10, &option);
1106 kfree(string);
1107 if (rc != 0)
d23c45fd
CL		 1108 goto out_invalid_value;
1109 mnt->wsize = option;
bf0fd768
CL		 1110 break;
1111 case Opt_bsize:
a5a16bae
CL		 1112 string = match_strdup(args);
1113 if (string == NULL)
1114 goto out_nomem;
1115 rc = strict_strtoul(string, 10, &option);
1116 kfree(string);
1117 if (rc != 0)
d23c45fd
CL		 1118 goto out_invalid_value;
1119 mnt->bsize = option;
bf0fd768
CL		 1120 break;
1121 case Opt_timeo:
a5a16bae
CL		 1122 string = match_strdup(args);
1123 if (string == NULL)
1124 goto out_nomem;
1125 rc = strict_strtoul(string, 10, &option);
1126 kfree(string);
1127 if (rc != 0 || option == 0)
d23c45fd
CL		 1128 goto out_invalid_value;
1129 mnt->timeo = option;
bf0fd768
CL		 1130 break;
1131 case Opt_retrans:
a5a16bae
CL		 1132 string = match_strdup(args);
1133 if (string == NULL)
1134 goto out_nomem;
1135 rc = strict_strtoul(string, 10, &option);
1136 kfree(string);
1137 if (rc != 0 || option == 0)
d23c45fd
CL		 1138 goto out_invalid_value;
1139 mnt->retrans = option;
bf0fd768
CL		 1140 break;
1141 case Opt_acregmin:
a5a16bae
CL		 1142 string = match_strdup(args);
1143 if (string == NULL)
1144 goto out_nomem;
1145 rc = strict_strtoul(string, 10, &option);
1146 kfree(string);
1147 if (rc != 0)
d23c45fd
CL		 1148 goto out_invalid_value;
1149 mnt->acregmin = option;
bf0fd768
CL		 1150 break;
1151 case Opt_acregmax:
a5a16bae
CL		 1152 string = match_strdup(args);
1153 if (string == NULL)
1154 goto out_nomem;
1155 rc = strict_strtoul(string, 10, &option);
1156 kfree(string);
1157 if (rc != 0)
d23c45fd
CL		 1158 goto out_invalid_value;
1159 mnt->acregmax = option;
bf0fd768
CL		 1160 break;
1161 case Opt_acdirmin:
a5a16bae
CL		 1162 string = match_strdup(args);
1163 if (string == NULL)
1164 goto out_nomem;
1165 rc = strict_strtoul(string, 10, &option);
1166 kfree(string);
1167 if (rc != 0)
d23c45fd
CL		 1168 goto out_invalid_value;
1169 mnt->acdirmin = option;
bf0fd768
CL		 1170 break;
1171 case Opt_acdirmax:
a5a16bae
CL		 1172 string = match_strdup(args);
1173 if (string == NULL)
1174 goto out_nomem;
1175 rc = strict_strtoul(string, 10, &option);
1176 kfree(string);
1177 if (rc != 0)
d23c45fd
CL		 1178 goto out_invalid_value;
1179 mnt->acdirmax = option;
bf0fd768
CL		 1180 break;
1181 case Opt_actimeo:
a5a16bae
CL		 1182 string = match_strdup(args);
1183 if (string == NULL)
1184 goto out_nomem;
1185 rc = strict_strtoul(string, 10, &option);
1186 kfree(string);
1187 if (rc != 0)
d23c45fd
CL		 1188 goto out_invalid_value;
1189 mnt->acregmin = mnt->acregmax =
1190 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1191 break;
1192 case Opt_namelen:
a5a16bae
CL		 1193 string = match_strdup(args);
1194 if (string == NULL)
1195 goto out_nomem;
1196 rc = strict_strtoul(string, 10, &option);
1197 kfree(string);
1198 if (rc != 0)
d23c45fd
CL		 1199 goto out_invalid_value;
1200 mnt->namlen = option;
bf0fd768
CL		 1201 break;
1202 case Opt_mountport:
a5a16bae
CL		 1203 string = match_strdup(args);
1204 if (string == NULL)
1205 goto out_nomem;
1206 rc = strict_strtoul(string, 10, &option);
1207 kfree(string);
4be929be 1208 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1209 goto out_invalid_value;
1210 mnt->mount_server.port = option;
bf0fd768 1211 break;
bf0fd768 1212 case Opt_mountvers:
a5a16bae
CL		 1213 string = match_strdup(args);
1214 if (string == NULL)
1215 goto out_nomem;
1216 rc = strict_strtoul(string, 10, &option);
1217 kfree(string);
1218 if (rc != 0 ||
f45663ce 1219 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1220 option > NFS_MNT3_VERSION)
1221 goto out_invalid_value;
1222 mnt->mount_server.version = option;
bf0fd768 1223 break;
bf0fd768 1224 case Opt_nfsvers:
a5a16bae
CL		 1225 string = match_strdup(args);
1226 if (string == NULL)
1227 goto out_nomem;
1228 rc = strict_strtoul(string, 10, &option);
1229 kfree(string);
1230 if (rc != 0)
d23c45fd 1231 goto out_invalid_value;
bf0fd768 1232 switch (option) {
f45663ce 1233 case NFS2_VERSION:
bf0fd768 1234 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1235 mnt->version = 2;
bf0fd768 1236 break;
f45663ce 1237 case NFS3_VERSION:
bf0fd768 1238 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1239 mnt->version = 3;
1240 break;
1241#ifdef CONFIG_NFS_V4
1242 case NFS4_VERSION:
1243 mnt->flags &= ~NFS_MOUNT_VER3;
1244 mnt->version = 4;
bf0fd768 1245 break;
764302cc 1246#endif
bf0fd768 1247 default:
d23c45fd 1248 goto out_invalid_value;
bf0fd768
CL		 1249 }
1250 break;
3fd5be9e 1251 case Opt_minorversion:
f3f4f4ed
CL		 1252 string = match_strdup(args);
1253 if (string == NULL)
1254 goto out_nomem;
1255 rc = strict_strtoul(string, 10, &option);
1256 kfree(string);
1257 if (rc != 0)
1258 goto out_invalid_value;
1259 if (option > NFS4_MAX_MINOR_VERSION)
1260 goto out_invalid_value;
1261 mnt->minorversion = option;
3fd5be9e 1262 break;
bf0fd768 1263
f45663ce
CL		 1264 /*
1265 * options that take text values
1266 */
bf0fd768
CL		 1267 case Opt_sec:
1268 string = match_strdup(args);
1269 if (string == NULL)
1270 goto out_nomem;
01060c89 1271 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1272 kfree(string);
f45663ce 1273 if (!rc) {
f45663ce
CL		 1274 dfprintk(MOUNT, "NFS: unrecognized "
1275 "security flavor\n");
d23c45fd 1276 return 0;
f45663ce 1277 }
bf0fd768
CL		 1278 break;
1279 case Opt_proto:
1280 string = match_strdup(args);
1281 if (string == NULL)
1282 goto out_nomem;
1283 token = match_token(string,
1284 nfs_xprt_protocol_tokens, args);
bf0fd768 1285
ee671b01 1286 protofamily = AF_INET;
bf0fd768 1287 switch (token) {
ee671b01
JL		 1288 case Opt_xprt_udp6:
1289 protofamily = AF_INET6;
fdb66ff4 1290 case Opt_xprt_udp:
bf0fd768 1291 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1292 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1293 kfree(string);
bf0fd768 1294 break;
ee671b01
JL		 1295 case Opt_xprt_tcp6:
1296 protofamily = AF_INET6;
fdb66ff4 1297 case Opt_xprt_tcp:
bf0fd768 1298 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1299 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1300 kfree(string);
bf0fd768 1301 break;
2cf7ff7a
TT		 1302 case Opt_xprt_rdma:
1303 /* vector side protocols to TCP */
1304 mnt->flags |= NFS_MOUNT_TCP;
1305 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1306 xprt_load_transport(string);
d23c45fd 1307 kfree(string);
2cf7ff7a 1308 break;
bf0fd768 1309 default:
f45663ce
CL		 1310 dfprintk(MOUNT, "NFS: unrecognized "
1311 "transport protocol\n");
4223a4a1 1312 kfree(string);
d23c45fd 1313 return 0;
bf0fd768
CL		 1314 }
1315 break;
1316 case Opt_mountproto:
1317 string = match_strdup(args);
1318 if (string == NULL)
1319 goto out_nomem;
1320 token = match_token(string,
1321 nfs_xprt_protocol_tokens, args);
d508afb4 1322 kfree(string);
bf0fd768 1323
ee671b01 1324 mountfamily = AF_INET;
bf0fd768 1325 switch (token) {
ee671b01
JL		 1326 case Opt_xprt_udp6:
1327 mountfamily = AF_INET6;
fdb66ff4 1328 case Opt_xprt_udp:
0896a725 1329 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1330 break;
ee671b01
JL		 1331 case Opt_xprt_tcp6:
1332 mountfamily = AF_INET6;
fdb66ff4 1333 case Opt_xprt_tcp:
0896a725 1334 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1335 break;
2cf7ff7a 1336 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1337 default:
f45663ce
CL		 1338 dfprintk(MOUNT, "NFS: unrecognized "
1339 "transport protocol\n");
d23c45fd 1340 return 0;
bf0fd768
CL		 1341 }
1342 break;
1343 case Opt_addr:
1344 string = match_strdup(args);
1345 if (string == NULL)
1346 goto out_nomem;
53a0b9c4
CL		 1347 mnt->nfs_server.addrlen =
1348 rpc_pton(string, strlen(string),
1349 (struct sockaddr *)
1350 &mnt->nfs_server.address,
1351 sizeof(mnt->nfs_server.address));
bf0fd768 1352 kfree(string);
53a0b9c4
CL		 1353 if (mnt->nfs_server.addrlen == 0)
1354 goto out_invalid_address;
bf0fd768
CL		 1355 break;
1356 case Opt_clientaddr:
1357 string = match_strdup(args);
1358 if (string == NULL)
1359 goto out_nomem;
fc601477 1360 kfree(mnt->client_address);
bf0fd768
CL		 1361 mnt->client_address = string;
1362 break;
33832034
CL		 1363 case Opt_mounthost:
1364 string = match_strdup(args);
1365 if (string == NULL)
1366 goto out_nomem;
fc601477 1367 kfree(mnt->mount_server.hostname);
33832034
CL		 1368 mnt->mount_server.hostname = string;
1369 break;
0ac83779 1370 case Opt_mountaddr:
bf0fd768
CL		 1371 string = match_strdup(args);
1372 if (string == NULL)
1373 goto out_nomem;
53a0b9c4
CL		 1374 mnt->mount_server.addrlen =
1375 rpc_pton(string, strlen(string),
1376 (struct sockaddr *)
1377 &mnt->mount_server.address,
1378 sizeof(mnt->mount_server.address));
bf0fd768 1379 kfree(string);
53a0b9c4
CL		 1380 if (mnt->mount_server.addrlen == 0)
1381 goto out_invalid_address;
bf0fd768 1382 break;
7973c1f1
TM		 1383 case Opt_lookupcache:
1384 string = match_strdup(args);
1385 if (string == NULL)
1386 goto out_nomem;
1387 token = match_token(string,
1388 nfs_lookupcache_tokens, args);
1389 kfree(string);
1390 switch (token) {
1391 case Opt_lookupcache_all:
1392 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1393 break;
1394 case Opt_lookupcache_positive:
1395 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1396 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1397 break;
1398 case Opt_lookupcache_none:
1399 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1400 break;
1401 default:
7973c1f1
TM		 1402 dfprintk(MOUNT, "NFS: invalid "
1403 "lookupcache argument\n");
d23c45fd 1404 return 0;
7973c1f1
TM		 1405 };
1406 break;
a6d5ff64
CL		 1407 case Opt_fscache_uniq:
1408 string = match_strdup(args);
1409 if (string == NULL)
1410 goto out_nomem;
1411 kfree(mnt->fscache_uniq);
1412 mnt->fscache_uniq = string;
1413 mnt->options |= NFS_OPTION_FSCACHE;
1414 break;
bf0fd768 1415
f45663ce
CL		 1416 /*
1417 * Special options
1418 */
1419 case Opt_sloppy:
1420 sloppy = 1;
1421 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1422 break;
bf0fd768
CL		 1423 case Opt_userspace:
1424 case Opt_deprecated:
d33e4dfe
CL		 1425 dfprintk(MOUNT, "NFS: ignoring mount option "
1426 "'%s'\n", p);
bf0fd768
CL		 1427 break;
1428
1429 default:
d23c45fd 1430 invalid_option = 1;
f45663ce
CL		 1431 dfprintk(MOUNT, "NFS: unrecognized mount option "
1432 "'%s'\n", p);
bf0fd768
CL		 1433 }
1434 }
1435
d23c45fd
CL		 1436 if (!sloppy && invalid_option)
1437 return 0;
1438
ee671b01
JL		 1439 /*
1440 * verify that any proto=/mountproto= options match the address
1441 * familiies in the addr=/mountaddr= options.
1442 */
1443 if (protofamily != AF_UNSPEC &&
1444 protofamily != mnt->nfs_server.address.ss_family)
1445 goto out_proto_mismatch;
1446
1447 if (mountfamily != AF_UNSPEC) {
1448 if (mnt->mount_server.addrlen) {
1449 if (mountfamily != mnt->mount_server.address.ss_family)
1450 goto out_mountproto_mismatch;
1451 } else {
1452 if (mountfamily != mnt->nfs_server.address.ss_family)
1453 goto out_mountproto_mismatch;
1454 }
1455 }
1456
bf0fd768
CL		 1457 return 1;
1458
ee671b01
JL		 1459out_mountproto_mismatch:
1460 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1461 "option\n");
1462 return 0;
1463out_proto_mismatch:
1464 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1465 return 0;
53a0b9c4
CL		 1466out_invalid_address:
1467 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1468 return 0;
d23c45fd 1469out_invalid_value:
53a0b9c4 1470 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1471 return 0;
bf0fd768
CL		 1472out_nomem:
1473 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1474 return 0;
f9c3a380
EP		 1475out_security_failure:
1476 free_secdata(secdata);
1477 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1478 return 0;
bf0fd768
CL		 1479}
1480
ec88f28d
CL		 1481/*
1482 * Match the requested auth flavors with the list returned by
1483 * the server. Returns zero and sets the mount's authentication
1484 * flavor on success; returns -EACCES if server does not support
1485 * the requested flavor.
1486 */
1487static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1488 struct nfs_mount_request *request)
1489{
1490 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1491
5eecfde6
CL		 1492 /*
1493 * Certain releases of Linux's mountd return an empty
1494 * flavor list. To prevent behavioral regression with
1495 * these servers (ie. rejecting mounts that used to
1496 * succeed), revert to pre-2.6.32 behavior (no checking)
1497 * if the returned flavor list is empty.
1498 */
1499 if (server_authlist_len == 0)
1500 return 0;
1501
ec88f28d
CL		 1502 /*
1503 * We avoid sophisticated negotiating here, as there are
1504 * plenty of cases where we can get it wrong, providing
1505 * either too little or too much security.
1506 *
1507 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1508 * flavor listed first. However, some servers list
1509 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1510 * preferred default, in args->auth_flavors[0] if user
1511 * didn't specify sec= mount option.
1512 */
1513 for (i = 0; i < args->auth_flavor_len; i++)
1514 for (j = 0; j < server_authlist_len; j++)
1515 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1516 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1517 request->auth_flavs[j]);
1518 args->auth_flavors[0] = request->auth_flavs[j];
1519 return 0;
1520 }
1521
1522 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1523 nfs_umount(request);
1524 return -EACCES;
1525}
1526
0076d7b7
CL		 1527/*
1528 * Use the remote server's MOUNT service to request the NFS file handle
1529 * corresponding to the provided path.
1530 */
1531static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1532 struct nfs_fh *root_fh)
1533{
ec88f28d
CL		 1534 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1535 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1536 struct nfs_mount_request request = {
1537 .sap = (struct sockaddr *)
1538 &args->mount_server.address,
1539 .dirpath = args->nfs_server.export_path,
1540 .protocol = args->mount_server.protocol,
1541 .fh = root_fh,
50a737f8 1542 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1543 .auth_flav_len = &server_authlist_len,
1544 .auth_flavs = server_authlist,
c5d120f8 1545 };
4c568017 1546 int status;
0076d7b7
CL		 1547
1548 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1549 switch (args->version) {
1550 default:
1551 args->mount_server.version = NFS_MNT3_VERSION;
1552 break;
1553 case 2:
1554 args->mount_server.version = NFS_MNT_VERSION;
1555 }
0076d7b7 1556 }
c5d120f8 1557 request.version = args->mount_server.version;
0076d7b7 1558
33832034 1559 if (args->mount_server.hostname)
c5d120f8 1560 request.hostname = args->mount_server.hostname;
33832034 1561 else
c5d120f8 1562 request.hostname = args->nfs_server.hostname;
33832034 1563
0076d7b7
CL		 1564 /*
1565 * Construct the mount server's address.
1566 */
4c568017 1567 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1568 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1569 args->nfs_server.addrlen);
1570 args->mount_server.addrlen = args->nfs_server.addrlen;
1571 }
c5d120f8 1572 request.salen = args->mount_server.addrlen;
f5855fec 1573 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1574
1575 /*
1576 * Now ask the mount server to map our export path
1577 * to a file handle.
1578 */
c5d120f8 1579 status = nfs_mount(&request);
ec88f28d
CL		 1580 if (status != 0) {
1581 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1582 request.hostname, status);
1583 return status;
1584 }
0076d7b7 1585
ec88f28d
CL		 1586 /*
1587 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1588 */
1589 if (args->mount_server.version != NFS_MNT3_VERSION)
1590 return 0;
1591 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1592}
1593
d1aa0825
CL		 1594static int nfs_parse_simple_hostname(const char *dev_name,
1595 char **hostname, size_t maxnamlen,
1596 char **export_path, size_t maxpathlen)
dc045898
CL		 1597{
1598 size_t len;
1599 char *colon, *comma;
1600
1601 colon = strchr(dev_name, ':');
1602 if (colon == NULL)
1603 goto out_bad_devname;
1604
1605 len = colon - dev_name;
1606 if (len > maxnamlen)
1607 goto out_hostname;
1608
1609 /* N.B. caller will free nfs_server.hostname in all cases */
1610 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1611 if (!*hostname)
1612 goto out_nomem;
1613
1614 /* kill possible hostname list: not supported */
1615 comma = strchr(*hostname, ',');
1616 if (comma != NULL) {
1617 if (comma == *hostname)
1618 goto out_bad_devname;
1619 *comma = '\0';
1620 }
1621
1622 colon++;
1623 len = strlen(colon);
1624 if (len > maxpathlen)
1625 goto out_path;
1626 *export_path = kstrndup(colon, len, GFP_KERNEL);
1627 if (!*export_path)
1628 goto out_nomem;
1629
1630 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1631 return 0;
1632
1633out_bad_devname:
1634 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1635 return -EINVAL;
1636
1637out_nomem:
1638 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1639 return -ENOMEM;
1640
1641out_hostname:
1642 dfprintk(MOUNT, "NFS: server hostname too long\n");
1643 return -ENAMETOOLONG;
1644
1645out_path:
1646 dfprintk(MOUNT, "NFS: export pathname too long\n");
1647 return -ENAMETOOLONG;
1648}
1649
d1aa0825
CL		 1650/*
1651 * Hostname has square brackets around it because it contains one or
1652 * more colons. We look for the first closing square bracket, and a
1653 * colon must follow it.
1654 */
1655static int nfs_parse_protected_hostname(const char *dev_name,
1656 char **hostname, size_t maxnamlen,
1657 char **export_path, size_t maxpathlen)
1658{
1659 size_t len;
1660 char *start, *end;
1661
1662 start = (char *)(dev_name + 1);
1663
1664 end = strchr(start, ']');
1665 if (end == NULL)
1666 goto out_bad_devname;
1667 if (*(end + 1) != ':')
1668 goto out_bad_devname;
1669
1670 len = end - start;
1671 if (len > maxnamlen)
1672 goto out_hostname;
1673
1674 /* N.B. caller will free nfs_server.hostname in all cases */
1675 *hostname = kstrndup(start, len, GFP_KERNEL);
1676 if (*hostname == NULL)
1677 goto out_nomem;
1678
1679 end += 2;
1680 len = strlen(end);
1681 if (len > maxpathlen)
1682 goto out_path;
1683 *export_path = kstrndup(end, len, GFP_KERNEL);
1684 if (!*export_path)
1685 goto out_nomem;
1686
1687 return 0;
1688
1689out_bad_devname:
1690 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1691 return -EINVAL;
1692
1693out_nomem:
1694 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1695 return -ENOMEM;
1696
1697out_hostname:
1698 dfprintk(MOUNT, "NFS: server hostname too long\n");
1699 return -ENAMETOOLONG;
1700
1701out_path:
1702 dfprintk(MOUNT, "NFS: export pathname too long\n");
1703 return -ENAMETOOLONG;
1704}
1705
1706/*
1707 * Split "dev_name" into "hostname:export_path".
1708 *
1709 * The leftmost colon demarks the split between the server's hostname
1710 * and the export path. If the hostname starts with a left square
1711 * bracket, then it may contain colons.
1712 *
1713 * Note: caller frees hostname and export path, even on error.
1714 */
1715static int nfs_parse_devname(const char *dev_name,
1716 char **hostname, size_t maxnamlen,
1717 char **export_path, size_t maxpathlen)
1718{
1719 if (*dev_name == '[')
1720 return nfs_parse_protected_hostname(dev_name,
1721 hostname, maxnamlen,
1722 export_path, maxpathlen);
1723
1724 return nfs_parse_simple_hostname(dev_name,
1725 hostname, maxnamlen,
1726 export_path, maxpathlen);
1727}
1728
f7b422b1 1729/*
54ceac45
DH		 1730 * Validate the NFS2/NFS3 mount data
1731 * - fills in the mount root filehandle
136d558c
CL		 1732 *
1733 * For option strings, user space handles the following behaviors:
1734 *
1735 * + DNS: mapping server host name to IP address ("addr=" option)
1736 *
1737 * + failure mode: how to behave if a mount request can't be handled
1738 * immediately ("fg/bg" option)
1739 *
1740 * + retry: how often to retry a mount request ("retry=" option)
1741 *
1742 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1743 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1744 */
2283f8d6
TT		 1745static int nfs_validate_mount_data(void *options,
1746 struct nfs_parsed_mount_data *args,
136d558c
CL		 1747 struct nfs_fh *mntfh,
1748 const char *dev_name)
f7b422b1 1749{
2283f8d6 1750 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1751 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1752
5df36e78
CL		 1753 if (data == NULL)
1754 goto out_no_data;
f7b422b1 1755
54ceac45 1756 switch (data->version) {
5df36e78
CL		 1757 case 1:
1758 data->namlen = 0;
1759 case 2:
1760 data->bsize = 0;
1761 case 3:
1762 if (data->flags & NFS_MOUNT_VER3)
1763 goto out_no_v3;
1764 data->root.size = NFS2_FHSIZE;
1765 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1766 case 4:
1767 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1768 goto out_no_sec;
1769 case 5:
1770 memset(data->context, 0, sizeof(data->context));
1771 case 6:
b7e24457
TM		 1772 if (data->flags & NFS_MOUNT_VER3) {
1773 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1774 goto out_invalid_fh;
5df36e78 1775 mntfh->size = data->root.size;
764302cc
CL		 1776 args->version = 3;
1777 } else {
5df36e78 1778 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1779 args->version = 2;
1780 }
5df36e78 1781
5df36e78
CL		 1782
1783 memcpy(mntfh->data, data->root.data, mntfh->size);
1784 if (mntfh->size < sizeof(mntfh->data))
1785 memset(mntfh->data + mntfh->size, 0,
1786 sizeof(mntfh->data) - mntfh->size);
6e88e061 1787
2283f8d6
TT		 1788 /*
1789 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1790 * can deal with.
1791 */
ff3525a5 1792 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1793 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1794 args->rsize = data->rsize;
1795 args->wsize = data->wsize;
2283f8d6
TT		 1796 args->timeo = data->timeo;
1797 args->retrans = data->retrans;
1798 args->acregmin = data->acregmin;
1799 args->acregmax = data->acregmax;
1800 args->acdirmin = data->acdirmin;
1801 args->acdirmax = data->acdirmax;
4c568017 1802
4cfd74fc 1803 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1804 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1805 if (!nfs_verify_server_address(sap))
4c568017
CL		 1806 goto out_no_address;
1807
2283f8d6 1808 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1809 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1810 /* N.B. caller will free nfs_server.hostname in all cases */
1811 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1812 args->namlen = data->namlen;
1813 args->bsize = data->bsize;
dd07c947
CL		 1814
1815 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1816 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1817 if (!args->nfs_server.hostname)
1818 goto out_nomem;
f9c3a380
EP		 1819
1820 /*
1821 * The legacy version 6 binary mount data from userspace has a
1822 * field used only to transport selinux information into the
1823 * the kernel. To continue to support that functionality we
1824 * have a touch of selinux knowledge here in the NFS code. The
1825 * userspace code converted context=blah to just blah so we are
1826 * converting back to the full string selinux understands.
1827 */
1828 if (data->context[0]){
1829#ifdef CONFIG_SECURITY_SELINUX
1830 int rc;
1831 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1832 if (!opts_str)
1833 return -ENOMEM;
1834 strcpy(opts_str, "context=");
1835 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1836 strcat(opts_str, &data->context[0]);
1837 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1838 kfree(opts_str);
1839 if (rc)
1840 return rc;
1841#else
1842 return -EINVAL;
1843#endif
1844 }
1845
5df36e78 1846 break;
136d558c 1847 default: {
136d558c 1848 int status;
136d558c 1849
2283f8d6
TT		 1850 if (nfs_parse_mount_options((char *)options, args) == 0)
1851 return -EINVAL;
136d558c 1852
4cfd74fc 1853 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1854 goto out_no_address;
1855
764302cc
CL		 1856 if (args->version == 4)
1857#ifdef CONFIG_NFS_V4
1858 return nfs4_validate_text_mount_data(options,
1859 args, dev_name);
1860#else
1861 goto out_v4_not_compiled;
1862#endif
1863
f5855fec 1864 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1865
259875ef
TM		 1866 nfs_set_mount_transport_protocol(args);
1867
dc045898
CL		 1868 status = nfs_parse_devname(dev_name,
1869 &args->nfs_server.hostname,
1870 PAGE_SIZE,
1871 &args->nfs_server.export_path,
1872 NFS_MAXPATHLEN);
1873 if (!status)
1874 status = nfs_try_mount(args, mntfh);
136d558c 1875
dc045898
CL		 1876 kfree(args->nfs_server.export_path);
1877 args->nfs_server.export_path = NULL;
136d558c 1878
136d558c 1879 if (status)
fdc6e2c8 1880 return status;
136d558c 1881
136d558c
CL		 1882 break;
1883 }
f7b422b1 1884 }
54ceac45
DH		 1885
1886#ifndef CONFIG_NFS_V3
8a6e5deb 1887 if (args->version == 3)
5df36e78
CL		 1888 goto out_v3_not_compiled;
1889#endif /* !CONFIG_NFS_V3 */
f7b422b1 1890
5df36e78 1891 return 0;
f7b422b1 1892
5df36e78
CL		 1893out_no_data:
1894 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1895 return -EINVAL;
54ceac45 1896
5df36e78
CL		 1897out_no_v3:
1898 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1899 data->version);
1900 return -EINVAL;
f7b422b1 1901
5df36e78
CL		 1902out_no_sec:
1903 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1904 return -EINVAL;
1905
5df36e78
CL		 1906#ifndef CONFIG_NFS_V3
1907out_v3_not_compiled:
1908 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1909 return -EPROTONOSUPPORT;
1910#endif /* !CONFIG_NFS_V3 */
1911
764302cc
CL		 1912#ifndef CONFIG_NFS_V4
1913out_v4_not_compiled:
1914 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1915 return -EPROTONOSUPPORT;
1916#endif /* !CONFIG_NFS_V4 */
1917
63649bd7
CG		 1918out_nomem:
1919 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1920 return -ENOMEM;
1921
5df36e78
CL		 1922out_no_address:
1923 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1924 return -EINVAL;
1925
1926out_invalid_fh:
1927 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1928 return -EINVAL;
f7b422b1
DH		 1929}
1930
48b605f8
JL		 1931static int
1932nfs_compare_remount_data(struct nfs_server *nfss,
1933 struct nfs_parsed_mount_data *data)
1934{
1935 if (data->flags != nfss->flags ||
1936 data->rsize != nfss->rsize ||
1937 data->wsize != nfss->wsize ||
1938 data->retrans != nfss->client->cl_timeout->to_retries ||
1939 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1940 data->acregmin != nfss->acregmin / HZ ||
1941 data->acregmax != nfss->acregmax / HZ ||
1942 data->acdirmin != nfss->acdirmin / HZ ||
1943 data->acdirmax != nfss->acdirmax / HZ ||
1944 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1945 data->nfs_server.port != nfss->port ||
48b605f8 1946 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1947 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1948 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1949 return -EINVAL;
1950
1951 return 0;
1952}
1953
1954static int
1955nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1956{
1957 int error;
1958 struct nfs_server *nfss = sb->s_fs_info;
1959 struct nfs_parsed_mount_data *data;
1960 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1961 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1962 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1963
1964 /*
1965 * Userspace mount programs that send binary options generally send
1966 * them populated with default values. We have no way to know which
1967 * ones were explicitly specified. Fall back to legacy behavior and
1968 * just return success.
1969 */
31c94469
MZ		 1970 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1971 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1972 options->version <= 6))))
48b605f8
JL		 1973 return 0;
1974
1975 data = kzalloc(sizeof(*data), GFP_KERNEL);
1976 if (data == NULL)
1977 return -ENOMEM;
1978
1979 /* fill out struct with values from existing mount */
1980 data->flags = nfss->flags;
1981 data->rsize = nfss->rsize;
1982 data->wsize = nfss->wsize;
1983 data->retrans = nfss->client->cl_timeout->to_retries;
1984 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1985 data->acregmin = nfss->acregmin / HZ;
1986 data->acregmax = nfss->acregmax / HZ;
1987 data->acdirmin = nfss->acdirmin / HZ;
1988 data->acdirmax = nfss->acdirmax / HZ;
1989 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 1990 data->nfs_server.port = nfss->port;
48b605f8
JL		 1991 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1992 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1993 data->nfs_server.addrlen);
1994
1995 /* overwrite those values with any that were specified */
1996 error = nfs_parse_mount_options((char *)options, data);
1997 if (error < 0)
1998 goto out;
1999
2000 /* compare new mount options with old ones */
2001 error = nfs_compare_remount_data(nfss, data);
2002out:
2003 kfree(data);
2004 return error;
2005}
2006
f7b422b1 2007/*
54ceac45 2008 * Initialise the common bits of the superblock
f7b422b1 2009 */
54ceac45 2010static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2011{
54ceac45 2012 struct nfs_server *server = NFS_SB(sb);
5006a76c 2013
54ceac45 2014 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2015
54ceac45
DH		 2016 /* We probably want something more informative here */
2017 snprintf(sb->s_id, sizeof(sb->s_id),
2018 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2019
54ceac45
DH		 2020 if (sb->s_blocksize == 0)
2021 sb->s_blocksize = nfs_block_bits(server->wsize,
2022 &sb->s_blocksize_bits);
f7b422b1 2023
54ceac45
DH		 2024 if (server->flags & NFS_MOUNT_NOAC)
2025 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 2026
32a88aa1
JA		 2027 sb->s_bdi = &server->backing_dev_info;
2028
54ceac45 2029 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2030}
2031
2032/*
54ceac45 2033 * Finish setting up an NFS2/3 superblock
f7b422b1 2034 */
2283f8d6
TT		 2035static void nfs_fill_super(struct super_block *sb,
2036 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2037{
2038 struct nfs_server *server = NFS_SB(sb);
5006a76c 2039
54ceac45
DH		 2040 sb->s_blocksize_bits = 0;
2041 sb->s_blocksize = 0;
2042 if (data->bsize)
2043 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2044
8a6e5deb 2045 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2046 /* The VFS shouldn't apply the umask to mode bits. We will do
2047 * so ourselves when necessary.
2048 */
2049 sb->s_flags |= MS_POSIXACL;
2050 sb->s_time_gran = 1;
816724e6 2051 }
54ceac45
DH		 2052
2053 sb->s_op = &nfs_sops;
2054 nfs_initialise_sb(sb);
f7b422b1
DH		 2055}
2056
2057/*
54ceac45 2058 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2059 */
54ceac45
DH		 2060static void nfs_clone_super(struct super_block *sb,
2061 const struct super_block *old_sb)
f7b422b1 2062{
54ceac45
DH		 2063 struct nfs_server *server = NFS_SB(sb);
2064
2065 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2066 sb->s_blocksize = old_sb->s_blocksize;
2067 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2068
8a6e5deb 2069 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2070 /* The VFS shouldn't apply the umask to mode bits. We will do
2071 * so ourselves when necessary.
f7b422b1
DH		 2072 */
2073 sb->s_flags |= MS_POSIXACL;
f7b422b1 2074 sb->s_time_gran = 1;
f7b422b1
DH		 2075 }
2076
54ceac45
DH		 2077 sb->s_op = old_sb->s_op;
2078 nfs_initialise_sb(sb);
f7b422b1
DH		 2079}
2080
275a5d24
TM		 2081static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2082{
2083 const struct nfs_server *a = s->s_fs_info;
2084 const struct rpc_clnt *clnt_a = a->client;
2085 const struct rpc_clnt *clnt_b = b->client;
2086
2087 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2088 goto Ebusy;
2089 if (a->nfs_client != b->nfs_client)
2090 goto Ebusy;
2091 if (a->flags != b->flags)
2092 goto Ebusy;
2093 if (a->wsize != b->wsize)
2094 goto Ebusy;
2095 if (a->rsize != b->rsize)
2096 goto Ebusy;
2097 if (a->acregmin != b->acregmin)
2098 goto Ebusy;
2099 if (a->acregmax != b->acregmax)
2100 goto Ebusy;
2101 if (a->acdirmin != b->acdirmin)
2102 goto Ebusy;
2103 if (a->acdirmax != b->acdirmax)
2104 goto Ebusy;
2105 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2106 goto Ebusy;
e89a5a43 2107 return 1;
275a5d24 2108Ebusy:
e89a5a43
TM		 2109 return 0;
2110}
2111
2112struct nfs_sb_mountdata {
2113 struct nfs_server *server;
2114 int mntflags;
2115};
2116
2117static int nfs_set_super(struct super_block *s, void *data)
2118{
2119 struct nfs_sb_mountdata *sb_mntdata = data;
2120 struct nfs_server *server = sb_mntdata->server;
2121 int ret;
2122
2123 s->s_flags = sb_mntdata->mntflags;
2124 s->s_fs_info = server;
2125 ret = set_anon_super(s, server);
2126 if (ret == 0)
2127 server->s_dev = s->s_dev;
2128 return ret;
2129}
2130
fd00a8ff
CL		 2131static int nfs_compare_super_address(struct nfs_server *server1,
2132 struct nfs_server *server2)
2133{
2134 struct sockaddr *sap1, *sap2;
2135
2136 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2137 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2138
2139 if (sap1->sa_family != sap2->sa_family)
2140 return 0;
2141
2142 switch (sap1->sa_family) {
2143 case AF_INET: {
2144 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2145 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2146 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2147 return 0;
2148 if (sin1->sin_port != sin2->sin_port)
2149 return 0;
2150 break;
2151 }
2152 case AF_INET6: {
2153 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2154 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2155 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2156 return 0;
2157 if (sin1->sin6_port != sin2->sin6_port)
2158 return 0;
2159 break;
2160 }
2161 default:
2162 return 0;
2163 }
2164
2165 return 1;
2166}
2167
e89a5a43
TM		 2168static int nfs_compare_super(struct super_block *sb, void *data)
2169{
2170 struct nfs_sb_mountdata *sb_mntdata = data;
2171 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2172 int mntflags = sb_mntdata->mntflags;
2173
fd00a8ff 2174 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2175 return 0;
2176 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2177 if (old->flags & NFS_MOUNT_UNSHARED)
2178 return 0;
2179 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2180 return 0;
2181 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2182}
2183
fa799759
MS		 2184static int nfs_bdi_register(struct nfs_server *server)
2185{
2186 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2187}
2188
816724e6
TM		 2189static int nfs_get_sb(struct file_system_type *fs_type,
2190 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2191{
f7b422b1
DH		 2192 struct nfs_server *server = NULL;
2193 struct super_block *s;
33852a1f
TM		 2194 struct nfs_parsed_mount_data *data;
2195 struct nfs_fh *mntfh;
54ceac45 2196 struct dentry *mntroot;
75180df2 2197 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2198 struct nfs_sb_mountdata sb_mntdata = {
2199 .mntflags = flags,
2200 };
33852a1f
TM		 2201 int error = -ENOMEM;
2202
c5811dbd 2203 data = nfs_alloc_parsed_mount_data(3);
b157b06c 2204 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2205 if (data == NULL || mntfh == NULL)
2206 goto out_free_fh;
f7b422b1 2207
33852a1f 2208 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2209
54ceac45 2210 /* Validate the mount data */
33852a1f 2211 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2212 if (error < 0)
0655960f 2213 goto out;
f7b422b1 2214
764302cc
CL		 2215#ifdef CONFIG_NFS_V4
2216 if (data->version == 4) {
2217 error = nfs4_try_mount(flags, dev_name, data, mnt);
2218 kfree(data->client_address);
9699eda6 2219 kfree(data->nfs_server.export_path);
764302cc
CL		 2220 goto out;
2221 }
2222#endif /* CONFIG_NFS_V4 */
2223
54ceac45 2224 /* Get a volume representation */
33852a1f 2225 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2226 if (IS_ERR(server)) {
2227 error = PTR_ERR(server);
0655960f 2228 goto out;
f7b422b1 2229 }
e89a5a43 2230 sb_mntdata.server = server;
f7b422b1 2231
75180df2
TM		 2232 if (server->flags & NFS_MOUNT_UNSHARED)
2233 compare_super = NULL;
2234
54ceac45 2235 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2236 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2237 if (IS_ERR(s)) {
2238 error = PTR_ERR(s);
54ceac45 2239 goto out_err_nosb;
816724e6
TM		 2240 }
2241
54ceac45
DH		 2242 if (s->s_fs_info != server) {
2243 nfs_free_server(server);
2244 server = NULL;
fa799759
MS		 2245 } else {
2246 error = nfs_bdi_register(server);
2247 if (error)
cfbc0683 2248 goto error_splat_bdi;
54ceac45 2249 }
f7b422b1 2250
54ceac45
DH		 2251 if (!s->s_root) {
2252 /* initial superblock/root creation */
33852a1f 2253 nfs_fill_super(s, data);
2df54806
DH		 2254 nfs_fscache_get_super_cookie(
2255 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2256 }
f7b422b1 2257
33852a1f 2258 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2259 if (IS_ERR(mntroot)) {
2260 error = PTR_ERR(mntroot);
2261 goto error_splat_super;
f7b422b1 2262 }
816724e6 2263
33852a1f 2264 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2265 if (error)
2266 goto error_splat_root;
2267
54ceac45
DH		 2268 s->s_flags |= MS_ACTIVE;
2269 mnt->mnt_sb = s;
2270 mnt->mnt_root = mntroot;
0655960f
CL		 2271 error = 0;
2272
2273out:
33852a1f
TM		 2274 kfree(data->nfs_server.hostname);
2275 kfree(data->mount_server.hostname);
08734048 2276 kfree(data->fscache_uniq);
33852a1f
TM		 2277 security_free_mnt_opts(&data->lsm_opts);
2278out_free_fh:
b157b06c 2279 nfs_free_fhandle(mntfh);
33852a1f 2280 kfree(data);
0655960f 2281 return error;
816724e6 2282
54ceac45
DH		 2283out_err_nosb:
2284 nfs_free_server(server);
0655960f 2285 goto out;
54ceac45 2286
f9c3a380
EP		 2287error_splat_root:
2288 dput(mntroot);
54ceac45 2289error_splat_super:
cfbc0683
N		 2290 if (server && !s->s_root)
2291 bdi_unregister(&server->backing_dev_info);
2292error_splat_bdi:
6f5bbff9 2293 deactivate_locked_super(s);
0655960f 2294 goto out;
f7b422b1
DH		 2295}
2296
387c149b
TM		 2297/*
2298 * Ensure that we unregister the bdi before kill_anon_super
2299 * releases the device name
2300 */
2301static void nfs_put_super(struct super_block *s)
2302{
2303 struct nfs_server *server = NFS_SB(s);
2304
2305 bdi_unregister(&server->backing_dev_info);
2306}
2307
54ceac45
DH		 2308/*
2309 * Destroy an NFS2/3 superblock
2310 */
f7b422b1
DH		 2311static void nfs_kill_super(struct super_block *s)
2312{
2313 struct nfs_server *server = NFS_SB(s);
2314
2315 kill_anon_super(s);
08734048 2316 nfs_fscache_release_super_cookie(s);
54ceac45 2317 nfs_free_server(server);
f7b422b1
DH		 2318}
2319
54ceac45
DH		 2320/*
2321 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2322 */
2323static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2324 const char *dev_name, void *raw_data,
2325 struct vfsmount *mnt)
f7b422b1
DH		 2326{
2327 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2328 struct super_block *s;
2329 struct nfs_server *server;
2330 struct dentry *mntroot;
75180df2 2331 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2332 struct nfs_sb_mountdata sb_mntdata = {
2333 .mntflags = flags,
2334 };
54ceac45 2335 int error;
f7b422b1 2336
54ceac45 2337 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2338
54ceac45
DH		 2339 /* create a new volume representation */
2340 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2341 if (IS_ERR(server)) {
2342 error = PTR_ERR(server);
2343 goto out_err_noserver;
2344 }
e89a5a43 2345 sb_mntdata.server = server;
8fa5c000 2346
75180df2
TM		 2347 if (server->flags & NFS_MOUNT_UNSHARED)
2348 compare_super = NULL;
2349
54ceac45 2350 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2351 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2352 if (IS_ERR(s)) {
2353 error = PTR_ERR(s);
2354 goto out_err_nosb;
2355 }
5006a76c 2356
54ceac45
DH		 2357 if (s->s_fs_info != server) {
2358 nfs_free_server(server);
2359 server = NULL;
fa799759
MS		 2360 } else {
2361 error = nfs_bdi_register(server);
2362 if (error)
cfbc0683 2363 goto error_splat_bdi;
f7b422b1 2364 }
24c8dbbb 2365
54ceac45
DH		 2366 if (!s->s_root) {
2367 /* initial superblock/root creation */
54ceac45 2368 nfs_clone_super(s, data->sb);
2df54806 2369 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2370 }
f7b422b1 2371
54ceac45
DH		 2372 mntroot = nfs_get_root(s, data->fh);
2373 if (IS_ERR(mntroot)) {
2374 error = PTR_ERR(mntroot);
2375 goto error_splat_super;
f7b422b1 2376 }
e9cc6c23 2377 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2378 dput(mntroot);
2379 error = -ESTALE;
2380 goto error_splat_super;
2381 }
f7b422b1 2382
54ceac45
DH		 2383 s->s_flags |= MS_ACTIVE;
2384 mnt->mnt_sb = s;
2385 mnt->mnt_root = mntroot;
f7b422b1 2386
f9c3a380
EP		 2387 /* clone any lsm security options from the parent to the new sb */
2388 security_sb_clone_mnt_opts(data->sb, s);
2389
54ceac45
DH		 2390 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2391 return 0;
24c8dbbb 2392
54ceac45
DH		 2393out_err_nosb:
2394 nfs_free_server(server);
2395out_err_noserver:
2396 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2397 return error;
f7b422b1 2398
54ceac45 2399error_splat_super:
cfbc0683
N		 2400 if (server && !s->s_root)
2401 bdi_unregister(&server->backing_dev_info);
2402error_splat_bdi:
6f5bbff9 2403 deactivate_locked_super(s);
54ceac45
DH		 2404 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2405 return error;
f7b422b1
DH		 2406}
2407
54ceac45
DH		 2408#ifdef CONFIG_NFS_V4
2409
f7b422b1 2410/*
54ceac45 2411 * Finish setting up a cloned NFS4 superblock
f7b422b1 2412 */
54ceac45
DH		 2413static void nfs4_clone_super(struct super_block *sb,
2414 const struct super_block *old_sb)
f7b422b1 2415{
54ceac45
DH		 2416 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2417 sb->s_blocksize = old_sb->s_blocksize;
2418 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2419 sb->s_time_gran = 1;
54ceac45
DH		 2420 sb->s_op = old_sb->s_op;
2421 nfs_initialise_sb(sb);
f7b422b1
DH		 2422}
2423
54ceac45
DH		 2424/*
2425 * Set up an NFS4 superblock
2426 */
2427static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2428{
54ceac45
DH		 2429 sb->s_time_gran = 1;
2430 sb->s_op = &nfs4_sops;
2431 nfs_initialise_sb(sb);
f7b422b1
DH		 2432}
2433
01c3f052
TM		 2434static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2435{
2436 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2437}
2438
7630c852
CL		 2439static int nfs4_validate_text_mount_data(void *options,
2440 struct nfs_parsed_mount_data *args,
2441 const char *dev_name)
2442{
2443 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2444
f5855fec 2445 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2446
2447 nfs_validate_transport_protocol(args);
2448
2449 nfs4_validate_mount_flags(args);
2450
2ecda72b
TM		 2451 if (args->version != 4) {
2452 dfprintk(MOUNT,
2453 "NFS4: Illegal mount version\n");
2454 return -EINVAL;
2455 }
2456
7630c852
CL		 2457 if (args->auth_flavor_len > 1) {
2458 dfprintk(MOUNT,
2459 "NFS4: Too many RPC auth flavours specified\n");
2460 return -EINVAL;
2461 }
2462
2463 if (args->client_address == NULL) {
2464 dfprintk(MOUNT,
2465 "NFS4: mount program didn't pass callback address\n");
2466 return -EINVAL;
2467 }
2468
2469 return nfs_parse_devname(dev_name,
2470 &args->nfs_server.hostname,
2471 NFS4_MAXNAMLEN,
2472 &args->nfs_server.export_path,
2473 NFS4_MAXPATHLEN);
2474}
2475
f0768ebd
CL		 2476/*
2477 * Validate NFSv4 mount options
2478 */
91ea40b9
TT		 2479static int nfs4_validate_mount_data(void *options,
2480 struct nfs_parsed_mount_data *args,
2481 const char *dev_name)
f0768ebd 2482{
4cfd74fc 2483 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2484 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2485 char *c;
2486
2487 if (data == NULL)
2488 goto out_no_data;
2489
2490 switch (data->version) {
2491 case 1:
4c568017
CL		 2492 if (data->host_addrlen > sizeof(args->nfs_server.address))
2493 goto out_no_address;
2494 if (data->host_addrlen == 0)
f0768ebd 2495 goto out_no_address;
4c568017 2496 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2497 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2498 return -EFAULT;
4cfd74fc 2499 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2500 goto out_no_address;
2501
6738b251
CL		 2502 if (data->auth_flavourlen) {
2503 if (data->auth_flavourlen > 1)
2504 goto out_inval_auth;
20c71f5e 2505 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2506 data->auth_flavours,
20c71f5e 2507 sizeof(args->auth_flavors[0])))
f0768ebd 2508 return -EFAULT;
f0768ebd
CL		 2509 }
2510
2511 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2512 if (IS_ERR(c))
2513 return PTR_ERR(c);
91ea40b9 2514 args->nfs_server.hostname = c;
f0768ebd
CL		 2515
2516 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2517 if (IS_ERR(c))
2518 return PTR_ERR(c);
91ea40b9
TT		 2519 args->nfs_server.export_path = c;
2520 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2521
2522 c = strndup_user(data->client_addr.data, 16);
2523 if (IS_ERR(c))
2524 return PTR_ERR(c);
91ea40b9
TT		 2525 args->client_address = c;
2526
2527 /*
2528 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2529 * can deal with.
2530 */
2531
2532 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2533 args->rsize = data->rsize;
2534 args->wsize = data->wsize;
2535 args->timeo = data->timeo;
2536 args->retrans = data->retrans;
2537 args->acregmin = data->acregmin;
2538 args->acregmax = data->acregmax;
2539 args->acdirmin = data->acdirmin;
2540 args->acdirmax = data->acdirmax;
2541 args->nfs_server.protocol = data->proto;
259875ef 2542 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2543
2544 break;
7630c852 2545 default:
91ea40b9 2546 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2547 return -EINVAL;
2548
4cfd74fc 2549 if (!nfs_verify_server_address(sap))
80071225 2550 return -EINVAL;
dc045898 2551
7630c852 2552 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2553 }
2554
2555 return 0;
2556
2557out_no_data:
2558 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2559 return -EINVAL;
2560
2561out_inval_auth:
2562 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2563 data->auth_flavourlen);
2564 return -EINVAL;
2565
2566out_no_address:
2567 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2568 return -EINVAL;
f0768ebd
CL		 2569}
2570
54ceac45 2571/*
c02d7adf 2572 * Get the superblock for the NFS4 root partition
54ceac45 2573 */
c02d7adf 2574static int nfs4_remote_get_sb(struct file_system_type *fs_type,
816724e6 2575 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2576{
c02d7adf 2577 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2578 struct super_block *s;
2579 struct nfs_server *server;
33852a1f 2580 struct nfs_fh *mntfh;
54ceac45 2581 struct dentry *mntroot;
75180df2 2582 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2583 struct nfs_sb_mountdata sb_mntdata = {
2584 .mntflags = flags,
2585 };
33852a1f
TM		 2586 int error = -ENOMEM;
2587
b157b06c 2588 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2589 if (data == NULL || mntfh == NULL)
2590 goto out_free_fh;
f7b422b1 2591
33852a1f 2592 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2593
54ceac45 2594 /* Get a volume representation */
33852a1f 2595 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2596 if (IS_ERR(server)) {
2597 error = PTR_ERR(server);
29eb981a 2598 goto out;
f7b422b1 2599 }
e89a5a43 2600 sb_mntdata.server = server;
f7b422b1 2601
75180df2
TM		 2602 if (server->flags & NFS4_MOUNT_UNSHARED)
2603 compare_super = NULL;
2604
54ceac45 2605 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2606 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2607 if (IS_ERR(s)) {
2608 error = PTR_ERR(s);
f7b422b1 2609 goto out_free;
816724e6
TM		 2610 }
2611
5dd3177a
TM		 2612 if (s->s_fs_info != server) {
2613 nfs_free_server(server);
2614 server = NULL;
fa799759
MS		 2615 } else {
2616 error = nfs_bdi_register(server);
2617 if (error)
cfbc0683 2618 goto error_splat_bdi;
5dd3177a
TM		 2619 }
2620
54ceac45
DH		 2621 if (!s->s_root) {
2622 /* initial superblock/root creation */
54ceac45 2623 nfs4_fill_super(s);
2df54806
DH		 2624 nfs_fscache_get_super_cookie(
2625 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2626 }
f7b422b1 2627
33852a1f 2628 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2629 if (IS_ERR(mntroot)) {
2630 error = PTR_ERR(mntroot);
2631 goto error_splat_super;
f7b422b1 2632 }
54ceac45 2633
33852a1f 2634 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2635 if (error)
2636 goto error_splat_root;
2637
f7b422b1 2638 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2639 mnt->mnt_sb = s;
2640 mnt->mnt_root = mntroot;
29eb981a
CL		 2641 error = 0;
2642
2643out:
33852a1f
TM		 2644 security_free_mnt_opts(&data->lsm_opts);
2645out_free_fh:
b157b06c 2646 nfs_free_fhandle(mntfh);
29eb981a 2647 return error;
54ceac45 2648
f7b422b1 2649out_free:
54ceac45 2650 nfs_free_server(server);
29eb981a 2651 goto out;
54ceac45 2652
46c8ac74
EP		 2653error_splat_root:
2654 dput(mntroot);
54ceac45 2655error_splat_super:
cfbc0683
N		 2656 if (server && !s->s_root)
2657 bdi_unregister(&server->backing_dev_info);
2658error_splat_bdi:
6f5bbff9 2659 deactivate_locked_super(s);
29eb981a 2660 goto out;
f7b422b1
DH		 2661}
2662
c02d7adf
TM		 2663static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2664 int flags, void *data, const char *hostname)
2665{
2666 struct vfsmount *root_mnt;
2667 char *root_devname;
2668 size_t len;
2669
2670 len = strlen(hostname) + 3;
2671 root_devname = kmalloc(len, GFP_KERNEL);
2672 if (root_devname == NULL)
2673 return ERR_PTR(-ENOMEM);
2674 snprintf(root_devname, len, "%s:/", hostname);
2675 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2676 kfree(root_devname);
2677 return root_mnt;
2678}
2679
b88f8a54
TM		 2680static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2681{
2682 char *page = (char *) __get_free_page(GFP_KERNEL);
2683 char *devname, *tmp;
2684
2685 if (page == NULL)
2686 return;
2687 devname = nfs_path(path->mnt->mnt_devname,
2688 path->mnt->mnt_root, path->dentry,
2689 page, PAGE_SIZE);
cdd29ecf 2690 if (IS_ERR(devname))
b88f8a54
TM		 2691 goto out_freepage;
2692 tmp = kstrdup(devname, GFP_KERNEL);
2693 if (tmp == NULL)
2694 goto out_freepage;
2695 kfree(mnt->mnt_devname);
2696 mnt->mnt_devname = tmp;
2697out_freepage:
2698 free_page((unsigned long)page);
2699}
2700
ce587e07
TM		 2701struct nfs_referral_count {
2702 struct list_head list;
2703 const struct task_struct *task;
2704 unsigned int referral_count;
2705};
2706
2707static LIST_HEAD(nfs_referral_count_list);
2708static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2709
2710static struct nfs_referral_count *nfs_find_referral_count(void)
2711{
2712 struct nfs_referral_count *p;
2713
2714 list_for_each_entry(p, &nfs_referral_count_list, list) {
2715 if (p->task == current)
2716 return p;
2717 }
2718 return NULL;
2719}
2720
2721#define NFS_MAX_NESTED_REFERRALS 2
2722
2723static int nfs_referral_loop_protect(void)
2724{
2725 struct nfs_referral_count *p, *new;
2726 int ret = -ENOMEM;
2727
2728 new = kmalloc(sizeof(*new), GFP_KERNEL);
2729 if (!new)
2730 goto out;
2731 new->task = current;
2732 new->referral_count = 1;
2733
2734 ret = 0;
2735 spin_lock(&nfs_referral_count_list_lock);
2736 p = nfs_find_referral_count();
2737 if (p != NULL) {
2738 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2739 ret = -ELOOP;
2740 else
2741 p->referral_count++;
2742 } else {
2743 list_add(&new->list, &nfs_referral_count_list);
2744 new = NULL;
2745 }
2746 spin_unlock(&nfs_referral_count_list_lock);
2747 kfree(new);
2748out:
2749 return ret;
2750}
2751
2752static void nfs_referral_loop_unprotect(void)
2753{
2754 struct nfs_referral_count *p;
2755
2756 spin_lock(&nfs_referral_count_list_lock);
2757 p = nfs_find_referral_count();
2758 p->referral_count--;
2759 if (p->referral_count == 0)
2760 list_del(&p->list);
2761 else
2762 p = NULL;
2763 spin_unlock(&nfs_referral_count_list_lock);
2764 kfree(p);
2765}
2766
c02d7adf
TM		 2767static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2768 const char *export_path, struct vfsmount *mnt_target)
2769{
04ffdbe2 2770 struct nameidata *nd = NULL;
a2770d86 2771 struct mnt_namespace *ns_private;
c02d7adf
TM		 2772 struct super_block *s;
2773 int ret;
2774
04ffdbe2
TM		 2775 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2776 if (nd == NULL)
2777 return -ENOMEM;
2778
a2770d86
LT		 2779 ns_private = create_mnt_ns(root_mnt);
2780 ret = PTR_ERR(ns_private);
2781 if (IS_ERR(ns_private))
2782 goto out_mntput;
2783
ce587e07
TM		 2784 ret = nfs_referral_loop_protect();
2785 if (ret != 0)
2786 goto out_put_mnt_ns;
2787
c02d7adf 2788 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
04ffdbe2 2789 export_path, LOOKUP_FOLLOW, nd);
c02d7adf 2790
ce587e07 2791 nfs_referral_loop_unprotect();
a2770d86
LT		 2792 put_mnt_ns(ns_private);
2793
c02d7adf
TM		 2794 if (ret != 0)
2795 goto out_err;
2796
04ffdbe2 2797 s = nd->path.mnt->mnt_sb;
c02d7adf
TM		 2798 atomic_inc(&s->s_active);
2799 mnt_target->mnt_sb = s;
04ffdbe2 2800 mnt_target->mnt_root = dget(nd->path.dentry);
c02d7adf 2801
b88f8a54 2802 /* Correct the device pathname */
04ffdbe2 2803 nfs_fix_devname(&nd->path, mnt_target);
b88f8a54 2804
04ffdbe2
TM		 2805 path_put(&nd->path);
2806 kfree(nd);
c02d7adf
TM		 2807 down_write(&s->s_umount);
2808 return 0;
ce587e07
TM		 2809out_put_mnt_ns:
2810 put_mnt_ns(ns_private);
c02d7adf
TM		 2811out_mntput:
2812 mntput(root_mnt);
2813out_err:
04ffdbe2 2814 kfree(nd);
c02d7adf
TM		 2815 return ret;
2816}
2817
a6fe23be
CL		 2818static int nfs4_try_mount(int flags, const char *dev_name,
2819 struct nfs_parsed_mount_data *data,
2820 struct vfsmount *mnt)
2821{
2822 char *export_path;
2823 struct vfsmount *root_mnt;
2824 int error;
2825
2826 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2827
2828 export_path = data->nfs_server.export_path;
2829 data->nfs_server.export_path = "/";
2830 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2831 data->nfs_server.hostname);
2832 data->nfs_server.export_path = export_path;
2833
2834 error = PTR_ERR(root_mnt);
2835 if (IS_ERR(root_mnt))
2836 goto out;
2837
2838 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2839
2840out:
2841 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2842 error != 0 ? " [error]" : "");
2843 return error;
2844}
2845
c02d7adf
TM		 2846/*
2847 * Get the superblock for an NFS4 mountpoint
2848 */
2849static int nfs4_get_sb(struct file_system_type *fs_type,
2850 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2851{
2852 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2853 int error = -ENOMEM;
2854
c5811dbd 2855 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2856 if (data == NULL)
2857 goto out_free_data;
2858
2859 /* Validate the mount data */
2860 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2861 if (error < 0)
2862 goto out;
2863
a6fe23be 2864 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2865
2866out:
2867 kfree(data->client_address);
2868 kfree(data->nfs_server.export_path);
2869 kfree(data->nfs_server.hostname);
2870 kfree(data->fscache_uniq);
2871out_free_data:
2872 kfree(data);
2873 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2874 error != 0 ? " [error]" : "");
2875 return error;
2876}
2877
f7b422b1
DH		 2878static void nfs4_kill_super(struct super_block *sb)
2879{
2880 struct nfs_server *server = NFS_SB(sb);
2881
0f3e66c6 2882 dprintk("--> %s\n", __func__);
515d8611 2883 nfs_super_return_all_delegations(sb);
f7b422b1 2884 kill_anon_super(sb);
08734048 2885 nfs_fscache_release_super_cookie(sb);
54ceac45 2886 nfs_free_server(server);
0f3e66c6 2887 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2888}
2889
2890/*
54ceac45 2891 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2892 */
54ceac45
DH		 2893static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2894 const char *dev_name, void *raw_data,
2895 struct vfsmount *mnt)
f7b422b1 2896{
54ceac45
DH		 2897 struct nfs_clone_mount *data = raw_data;
2898 struct super_block *s;
2899 struct nfs_server *server;
2900 struct dentry *mntroot;
75180df2 2901 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2902 struct nfs_sb_mountdata sb_mntdata = {
2903 .mntflags = flags,
2904 };
54ceac45 2905 int error;
f7b422b1 2906
54ceac45 2907 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2908
54ceac45
DH		 2909 /* create a new volume representation */
2910 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2911 if (IS_ERR(server)) {
2912 error = PTR_ERR(server);
2913 goto out_err_noserver;
f7b422b1 2914 }
e89a5a43 2915 sb_mntdata.server = server;
f7b422b1 2916
75180df2
TM		 2917 if (server->flags & NFS4_MOUNT_UNSHARED)
2918 compare_super = NULL;
2919
54ceac45 2920 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2921 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2922 if (IS_ERR(s)) {
2923 error = PTR_ERR(s);
2924 goto out_err_nosb;
f7b422b1 2925 }
f7b422b1 2926
54ceac45
DH		 2927 if (s->s_fs_info != server) {
2928 nfs_free_server(server);
2929 server = NULL;
fa799759
MS		 2930 } else {
2931 error = nfs_bdi_register(server);
2932 if (error)
cfbc0683 2933 goto error_splat_bdi;
54ceac45 2934 }
f7b422b1 2935
54ceac45
DH		 2936 if (!s->s_root) {
2937 /* initial superblock/root creation */
54ceac45 2938 nfs4_clone_super(s, data->sb);
2df54806 2939 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2940 }
f7b422b1 2941
54ceac45
DH		 2942 mntroot = nfs4_get_root(s, data->fh);
2943 if (IS_ERR(mntroot)) {
2944 error = PTR_ERR(mntroot);
2945 goto error_splat_super;
2946 }
e9cc6c23
TM		 2947 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2948 dput(mntroot);
2949 error = -ESTALE;
2950 goto error_splat_super;
2951 }
f7b422b1 2952
54ceac45
DH		 2953 s->s_flags |= MS_ACTIVE;
2954 mnt->mnt_sb = s;
2955 mnt->mnt_root = mntroot;
2956
46c8ac74
EP		 2957 security_sb_clone_mnt_opts(data->sb, s);
2958
54ceac45
DH		 2959 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2960 return 0;
2961
2962out_err_nosb:
2963 nfs_free_server(server);
2964out_err_noserver:
2965 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2966 return error;
2967
2968error_splat_super:
cfbc0683
N		 2969 if (server && !s->s_root)
2970 bdi_unregister(&server->backing_dev_info);
2971error_splat_bdi:
6f5bbff9 2972 deactivate_locked_super(s);
54ceac45
DH		 2973 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2974 return error;
f7b422b1
DH		 2975}
2976
c02d7adf
TM		 2977static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2978 int flags, const char *dev_name, void *raw_data,
2979 struct vfsmount *mnt)
f7b422b1
DH		 2980{
2981 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2982 struct super_block *s;
2983 struct nfs_server *server;
2984 struct dentry *mntroot;
4f727296 2985 struct nfs_fh *mntfh;
75180df2 2986 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2987 struct nfs_sb_mountdata sb_mntdata = {
2988 .mntflags = flags,
2989 };
4f727296 2990 int error = -ENOMEM;
54ceac45
DH		 2991
2992 dprintk("--> nfs4_referral_get_sb()\n");
2993
4f727296
TM		 2994 mntfh = nfs_alloc_fhandle();
2995 if (mntfh == NULL)
2996 goto out_err_nofh;
2997
54ceac45 2998 /* create a new volume representation */
4f727296 2999 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3000 if (IS_ERR(server)) {
3001 error = PTR_ERR(server);
3002 goto out_err_noserver;
3003 }
e89a5a43 3004 sb_mntdata.server = server;
54ceac45 3005
75180df2
TM		 3006 if (server->flags & NFS4_MOUNT_UNSHARED)
3007 compare_super = NULL;
3008
54ceac45 3009 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3010 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3011 if (IS_ERR(s)) {
3012 error = PTR_ERR(s);
3013 goto out_err_nosb;
3014 }
3015
3016 if (s->s_fs_info != server) {
3017 nfs_free_server(server);
3018 server = NULL;
fa799759
MS		 3019 } else {
3020 error = nfs_bdi_register(server);
3021 if (error)
cfbc0683 3022 goto error_splat_bdi;
54ceac45
DH		 3023 }
3024
3025 if (!s->s_root) {
3026 /* initial superblock/root creation */
54ceac45 3027 nfs4_fill_super(s);
2df54806 3028 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3029 }
3030
4f727296 3031 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 3032 if (IS_ERR(mntroot)) {
3033 error = PTR_ERR(mntroot);
3034 goto error_splat_super;
3035 }
e9cc6c23
TM		 3036 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3037 dput(mntroot);
3038 error = -ESTALE;
3039 goto error_splat_super;
3040 }
54ceac45
DH		 3041
3042 s->s_flags |= MS_ACTIVE;
3043 mnt->mnt_sb = s;
3044 mnt->mnt_root = mntroot;
3045
46c8ac74
EP		 3046 security_sb_clone_mnt_opts(data->sb, s);
3047
4f727296 3048 nfs_free_fhandle(mntfh);
54ceac45
DH		 3049 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3050 return 0;
3051
3052out_err_nosb:
3053 nfs_free_server(server);
3054out_err_noserver:
4f727296
TM		 3055 nfs_free_fhandle(mntfh);
3056out_err_nofh:
54ceac45
DH		 3057 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3058 return error;
3059
3060error_splat_super:
cfbc0683
N		 3061 if (server && !s->s_root)
3062 bdi_unregister(&server->backing_dev_info);
3063error_splat_bdi:
6f5bbff9 3064 deactivate_locked_super(s);
4f727296 3065 nfs_free_fhandle(mntfh);
54ceac45
DH		 3066 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3067 return error;
f7b422b1
DH		 3068}
3069
c02d7adf
TM		 3070/*
3071 * Create an NFS4 server record on referral traversal
3072 */
3073static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3074 int flags, const char *dev_name, void *raw_data,
3075 struct vfsmount *mnt)
3076{
3077 struct nfs_clone_mount *data = raw_data;
3078 char *export_path;
3079 struct vfsmount *root_mnt;
3080 int error;
3081
3082 dprintk("--> nfs4_referral_get_sb()\n");
3083
3084 export_path = data->mnt_path;
3085 data->mnt_path = "/";
3086
3087 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3088 flags, data, data->hostname);
3089 data->mnt_path = export_path;
3090
3091 error = PTR_ERR(root_mnt);
3092 if (IS_ERR(root_mnt))
3093 goto out;
3094
3095 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3096out:
3097 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3098 error != 0 ? " [error]" : "");
3099 return error;
3100}
3101
54ceac45 3102#endif /* CONFIG_NFS_V4 */
Clone of davem's net-next-2.6 tree