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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <[email protected]>, 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 * [email protected]
13 *
14 * Split from inode.c by David Howells <[email protected]>
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
CL		 50#include <linux/in6.h>
51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.h>
f7b422b1
DH		 56
57#include <asm/system.h>
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
f7b422b1
DH		 66
67#define NFSDBG_FACILITY NFSDBG_VFS
68
bf0fd768
CL		 69enum {
70 /* Mount options that take no arguments */
71 Opt_soft, Opt_hard,
bf0fd768
CL		 72 Opt_posix, Opt_noposix,
73 Opt_cto, Opt_nocto,
74 Opt_ac, Opt_noac,
75 Opt_lock, Opt_nolock,
76 Opt_v2, Opt_v3,
2cf7ff7a 77 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 78 Opt_acl, Opt_noacl,
79 Opt_rdirplus, Opt_nordirplus,
75180df2 80 Opt_sharecache, Opt_nosharecache,
d740351b 81 Opt_resvport, Opt_noresvport,
b797cac7 82 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 83
84 /* Mount options that take integer arguments */
85 Opt_port,
86 Opt_rsize, Opt_wsize, Opt_bsize,
87 Opt_timeo, Opt_retrans,
88 Opt_acregmin, Opt_acregmax,
89 Opt_acdirmin, Opt_acdirmax,
90 Opt_actimeo,
91 Opt_namelen,
92 Opt_mountport,
e887cbcf 93 Opt_mountvers,
ad879cef 94 Opt_nfsvers,
3fd5be9e 95 Opt_minorversion,
bf0fd768
CL		 96
97 /* Mount options that take string arguments */
33832034 98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 100 Opt_lookupcache,
b797cac7 101 Opt_fscache_uniq,
bf0fd768 102
f45663ce
CL		 103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 105
106 Opt_err
107};
108
a447c093 109static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
ecbb3845
CL		 112 { Opt_userspace, "retry=%s" },
113
f45663ce
CL		 114 { Opt_sloppy, "sloppy" },
115
bf0fd768
CL		 116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
d33e4dfe
CL		 118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
bf0fd768
CL		 120 { Opt_posix, "posix" },
121 { Opt_noposix, "noposix" },
122 { Opt_cto, "cto" },
123 { Opt_nocto, "nocto" },
124 { Opt_ac, "ac" },
125 { Opt_noac, "noac" },
126 { Opt_lock, "lock" },
127 { Opt_nolock, "nolock" },
128 { Opt_v2, "v2" },
129 { Opt_v3, "v3" },
130 { Opt_udp, "udp" },
131 { Opt_tcp, "tcp" },
2cf7ff7a 132 { Opt_rdma, "rdma" },
bf0fd768
CL		 133 { Opt_acl, "acl" },
134 { Opt_noacl, "noacl" },
135 { Opt_rdirplus, "rdirplus" },
136 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 137 { Opt_sharecache, "sharecache" },
138 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 139 { Opt_resvport, "resvport" },
140 { Opt_noresvport, "noresvport" },
b797cac7
DH		 141 { Opt_fscache, "fsc" },
142 { Opt_fscache_uniq, "fsc=%s" },
143 { Opt_nofscache, "nofsc" },
bf0fd768 144
a5a16bae
CL		 145 { Opt_port, "port=%s" },
146 { Opt_rsize, "rsize=%s" },
147 { Opt_wsize, "wsize=%s" },
148 { Opt_bsize, "bsize=%s" },
149 { Opt_timeo, "timeo=%s" },
150 { Opt_retrans, "retrans=%s" },
151 { Opt_acregmin, "acregmin=%s" },
152 { Opt_acregmax, "acregmax=%s" },
153 { Opt_acdirmin, "acdirmin=%s" },
154 { Opt_acdirmax, "acdirmax=%s" },
155 { Opt_actimeo, "actimeo=%s" },
156 { Opt_namelen, "namlen=%s" },
157 { Opt_mountport, "mountport=%s" },
158 { Opt_mountvers, "mountvers=%s" },
159 { Opt_nfsvers, "nfsvers=%s" },
160 { Opt_nfsvers, "vers=%s" },
3fd5be9e 161 { Opt_minorversion, "minorversion=%u" },
bf0fd768
CL		 162
163 { Opt_sec, "sec=%s" },
164 { Opt_proto, "proto=%s" },
165 { Opt_mountproto, "mountproto=%s" },
166 { Opt_addr, "addr=%s" },
167 { Opt_clientaddr, "clientaddr=%s" },
33832034 168 { Opt_mounthost, "mounthost=%s" },
0ac83779 169 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 170
7973c1f1
TM		 171 { Opt_lookupcache, "lookupcache=%s" },
172
bf0fd768
CL		 173 { Opt_err, NULL }
174};
175
176enum {
2cf7ff7a 177 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 178
179 Opt_xprt_err
180};
181
a447c093 182static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768
CL		 183 { Opt_xprt_udp, "udp" },
184 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 185 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 186
187 { Opt_xprt_err, NULL }
188};
189
190enum {
191 Opt_sec_none, Opt_sec_sys,
192 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
193 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
194 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
195
196 Opt_sec_err
197};
198
a447c093 199static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 200 { Opt_sec_none, "none" },
201 { Opt_sec_none, "null" },
202 { Opt_sec_sys, "sys" },
203
204 { Opt_sec_krb5, "krb5" },
205 { Opt_sec_krb5i, "krb5i" },
206 { Opt_sec_krb5p, "krb5p" },
207
208 { Opt_sec_lkey, "lkey" },
209 { Opt_sec_lkeyi, "lkeyi" },
210 { Opt_sec_lkeyp, "lkeyp" },
211
8d042218
OK		 212 { Opt_sec_spkm, "spkm3" },
213 { Opt_sec_spkmi, "spkm3i" },
214 { Opt_sec_spkmp, "spkm3p" },
215
bf0fd768
CL		 216 { Opt_sec_err, NULL }
217};
218
7973c1f1
TM		 219enum {
220 Opt_lookupcache_all, Opt_lookupcache_positive,
221 Opt_lookupcache_none,
222
223 Opt_lookupcache_err
224};
225
226static match_table_t nfs_lookupcache_tokens = {
227 { Opt_lookupcache_all, "all" },
228 { Opt_lookupcache_positive, "pos" },
229 { Opt_lookupcache_positive, "positive" },
230 { Opt_lookupcache_none, "none" },
231
232 { Opt_lookupcache_err, NULL }
233};
234
bf0fd768 235
42faad99 236static void nfs_umount_begin(struct super_block *);
816724e6 237static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 238static int nfs_show_options(struct seq_file *, struct vfsmount *);
239static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 240static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 241static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 242 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1 243static void nfs_kill_super(struct super_block *);
48b605f8 244static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 245
246static struct file_system_type nfs_fs_type = {
247 .owner = THIS_MODULE,
248 .name = "nfs",
249 .get_sb = nfs_get_sb,
250 .kill_sb = nfs_kill_super,
349457cc 251 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 252};
253
54ceac45 254struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 255 .owner = THIS_MODULE,
256 .name = "nfs",
54ceac45 257 .get_sb = nfs_xdev_get_sb,
f7b422b1 258 .kill_sb = nfs_kill_super,
349457cc 259 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 260};
261
ee9b6d61 262static const struct super_operations nfs_sops = {
f7b422b1
DH		 263 .alloc_inode = nfs_alloc_inode,
264 .destroy_inode = nfs_destroy_inode,
265 .write_inode = nfs_write_inode,
266 .statfs = nfs_statfs,
267 .clear_inode = nfs_clear_inode,
268 .umount_begin = nfs_umount_begin,
269 .show_options = nfs_show_options,
270 .show_stats = nfs_show_stats,
48b605f8 271 .remount_fs = nfs_remount,
f7b422b1
DH		 272};
273
274#ifdef CONFIG_NFS_V4
816724e6
TM		 275static int nfs4_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 277static int nfs4_remote_get_sb(struct file_system_type *fs_type,
278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 279static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
280 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
281static int nfs4_referral_get_sb(struct file_system_type *fs_type,
282 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 283static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
284 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 285static void nfs4_kill_super(struct super_block *sb);
286
287static struct file_system_type nfs4_fs_type = {
288 .owner = THIS_MODULE,
289 .name = "nfs4",
290 .get_sb = nfs4_get_sb,
291 .kill_sb = nfs4_kill_super,
349457cc 292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 293};
294
c02d7adf
TM		 295static struct file_system_type nfs4_remote_fs_type = {
296 .owner = THIS_MODULE,
297 .name = "nfs4",
298 .get_sb = nfs4_remote_get_sb,
299 .kill_sb = nfs4_kill_super,
300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
301};
302
54ceac45 303struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 304 .owner = THIS_MODULE,
305 .name = "nfs4",
54ceac45 306 .get_sb = nfs4_xdev_get_sb,
f7b422b1 307 .kill_sb = nfs4_kill_super,
349457cc 308 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 309};
310
c02d7adf
TM		 311static struct file_system_type nfs4_remote_referral_fs_type = {
312 .owner = THIS_MODULE,
313 .name = "nfs4",
314 .get_sb = nfs4_remote_referral_get_sb,
315 .kill_sb = nfs4_kill_super,
316 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
317};
318
54ceac45 319struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 320 .owner = THIS_MODULE,
321 .name = "nfs4",
54ceac45 322 .get_sb = nfs4_referral_get_sb,
f7b422b1 323 .kill_sb = nfs4_kill_super,
349457cc 324 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 325};
326
ee9b6d61 327static const struct super_operations nfs4_sops = {
f7b422b1
DH		 328 .alloc_inode = nfs_alloc_inode,
329 .destroy_inode = nfs_destroy_inode,
330 .write_inode = nfs_write_inode,
331 .statfs = nfs_statfs,
332 .clear_inode = nfs4_clear_inode,
333 .umount_begin = nfs_umount_begin,
334 .show_options = nfs_show_options,
335 .show_stats = nfs_show_stats,
48b605f8 336 .remount_fs = nfs_remount,
f7b422b1
DH		 337};
338#endif
339
8e1f936b
RR		 340static struct shrinker acl_shrinker = {
341 .shrink = nfs_access_cache_shrinker,
342 .seeks = DEFAULT_SEEKS,
343};
979df72e 344
f7b422b1
DH		 345/*
346 * Register the NFS filesystems
347 */
348int __init register_nfs_fs(void)
349{
350 int ret;
351
352 ret = register_filesystem(&nfs_fs_type);
353 if (ret < 0)
354 goto error_0;
355
f7b422b1
DH		 356 ret = nfs_register_sysctl();
357 if (ret < 0)
358 goto error_1;
89a09141 359#ifdef CONFIG_NFS_V4
f7b422b1
DH		 360 ret = register_filesystem(&nfs4_fs_type);
361 if (ret < 0)
362 goto error_2;
363#endif
8e1f936b 364 register_shrinker(&acl_shrinker);
f7b422b1
DH		 365 return 0;
366
367#ifdef CONFIG_NFS_V4
368error_2:
369 nfs_unregister_sysctl();
89a09141 370#endif
f7b422b1
DH		 371error_1:
372 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 373error_0:
374 return ret;
375}
376
377/*
378 * Unregister the NFS filesystems
379 */
380void __exit unregister_nfs_fs(void)
381{
8e1f936b 382 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 383#ifdef CONFIG_NFS_V4
384 unregister_filesystem(&nfs4_fs_type);
f7b422b1 385#endif
49af7ee1 386 nfs_unregister_sysctl();
f7b422b1
DH		 387 unregister_filesystem(&nfs_fs_type);
388}
389
1daef0a8 390void nfs_sb_active(struct super_block *sb)
ef818a28 391{
1daef0a8 392 struct nfs_server *server = NFS_SB(sb);
ef818a28 393
1daef0a8
TM		 394 if (atomic_inc_return(&server->active) == 1)
395 atomic_inc(&sb->s_active);
ef818a28
SD		 396}
397
1daef0a8 398void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 399{
400 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 401
402 if (atomic_dec_and_test(&server->active))
403 deactivate_super(sb);
ef818a28
SD		 404}
405
f7b422b1
DH		 406/*
407 * Deliver file system statistics to userspace
408 */
816724e6 409static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 410{
0c7d90cf 411 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 412 unsigned char blockbits;
413 unsigned long blockres;
0c7d90cf 414 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 415 struct nfs_fattr fattr;
416 struct nfs_fsstat res = {
417 .fattr = &fattr,
418 };
419 int error;
420
8fa5c000 421 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 422 if (error < 0)
423 goto out_err;
1a0ba9ae 424 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 425
426 /*
427 * Current versions of glibc do not correctly handle the
428 * case where f_frsize != f_bsize. Eventually we want to
429 * report the value of wtmult in this field.
430 */
0c7d90cf 431 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 432
433 /*
434 * On most *nix systems, f_blocks, f_bfree, and f_bavail
435 * are reported in units of f_frsize. Linux hasn't had
436 * an f_frsize field in its statfs struct until recently,
437 * thus historically Linux's sys_statfs reports these
438 * fields in units of f_bsize.
439 */
0c7d90cf
DH		 440 buf->f_bsize = dentry->d_sb->s_blocksize;
441 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 442 blockres = (1 << blockbits) - 1;
443 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
444 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
445 buf->f_bavail = (res.abytes + blockres) >> blockbits;
446
447 buf->f_files = res.tfiles;
448 buf->f_ffree = res.afiles;
449
450 buf->f_namelen = server->namelen;
1a0ba9ae 451
f7b422b1
DH		 452 return 0;
453
454 out_err:
3110ff80 455 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 456 return error;
f7b422b1
DH		 457}
458
7d4e2747
DH		 459/*
460 * Map the security flavour number to a name
461 */
81039f1f
TM		 462static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
463{
7d4e2747 464 static const struct {
81039f1f
TM		 465 rpc_authflavor_t flavour;
466 const char *str;
467 } sec_flavours[] = {
468 { RPC_AUTH_NULL, "null" },
469 { RPC_AUTH_UNIX, "sys" },
470 { RPC_AUTH_GSS_KRB5, "krb5" },
471 { RPC_AUTH_GSS_KRB5I, "krb5i" },
472 { RPC_AUTH_GSS_KRB5P, "krb5p" },
473 { RPC_AUTH_GSS_LKEY, "lkey" },
474 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
475 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
476 { RPC_AUTH_GSS_SPKM, "spkm" },
477 { RPC_AUTH_GSS_SPKMI, "spkmi" },
478 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 479 { UINT_MAX, "unknown" }
81039f1f
TM		 480 };
481 int i;
482
4d81cd16 483 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 484 if (sec_flavours[i].flavour == flavour)
485 break;
486 }
487 return sec_flavours[i].str;
488}
489
82d101d5
CL		 490static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
491 int showdefaults)
492{
493 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
494
495 switch (sap->sa_family) {
496 case AF_INET: {
497 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 498 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 499 break;
500 }
501 case AF_INET6: {
502 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
5b095d98 503 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
82d101d5
CL		 504 break;
505 }
506 default:
507 if (showdefaults)
508 seq_printf(m, ",mountaddr=unspecified");
509 }
510
511 if (nfss->mountd_version || showdefaults)
512 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
513 if (nfss->mountd_port || showdefaults)
514 seq_printf(m, ",mountport=%u", nfss->mountd_port);
515
516 switch (nfss->mountd_protocol) {
517 case IPPROTO_UDP:
518 seq_printf(m, ",mountproto=udp");
519 break;
520 case IPPROTO_TCP:
521 seq_printf(m, ",mountproto=tcp");
522 break;
523 default:
524 if (showdefaults)
525 seq_printf(m, ",mountproto=auto");
526 }
527}
528
f7b422b1
DH		 529/*
530 * Describe the mount options in force on this server representation
531 */
82d101d5
CL		 532static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
533 int showdefaults)
f7b422b1 534{
509de811 535 static const struct proc_nfs_info {
f7b422b1 536 int flag;
509de811
DH		 537 const char *str;
538 const char *nostr;
f7b422b1
DH		 539 } nfs_info[] = {
540 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 541 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 542 { NFS_MOUNT_NOCTO, ",nocto", "" },
543 { NFS_MOUNT_NOAC, ",noac", "" },
544 { NFS_MOUNT_NONLM, ",nolock", "" },
545 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 546 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 547 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
548 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 549 { 0, NULL, NULL }
550 };
509de811 551 const struct proc_nfs_info *nfs_infop;
8fa5c000 552 struct nfs_client *clp = nfss->nfs_client;
82d101d5 553 u32 version = clp->rpc_ops->version;
f7b422b1 554
82d101d5 555 seq_printf(m, ",vers=%u", version);
2d767432
CL		 556 seq_printf(m, ",rsize=%u", nfss->rsize);
557 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 558 if (nfss->bsize != 0)
559 seq_printf(m, ",bsize=%u", nfss->bsize);
560 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 561 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 562 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 563 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 564 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 565 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 566 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 567 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 568 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 569 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
570 if (nfss->flags & nfs_infop->flag)
571 seq_puts(m, nfs_infop->str);
572 else
573 seq_puts(m, nfs_infop->nostr);
574 }
56928edd
TT		 575 seq_printf(m, ",proto=%s",
576 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 577 if (version == 4) {
578 if (nfss->port != NFS_PORT)
579 seq_printf(m, ",port=%u", nfss->port);
580 } else
581 if (nfss->port)
582 seq_printf(m, ",port=%u", nfss->port);
583
33170233
TM		 584 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
585 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 586 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 587
588 if (version != 4)
589 nfs_show_mountd_options(m, nfss, showdefaults);
590
591#ifdef CONFIG_NFS_V4
592 if (clp->rpc_ops->version == 4)
593 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
594#endif
b797cac7
DH		 595 if (nfss->options & NFS_OPTION_FSCACHE)
596 seq_printf(m, ",fsc");
f7b422b1
DH		 597}
598
599/*
600 * Describe the mount options on this VFS mountpoint
601 */
602static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
603{
604 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
605
606 nfs_show_mount_options(m, nfss, 0);
607
5d8515ca
CL		 608 seq_printf(m, ",addr=%s",
609 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
610 RPC_DISPLAY_ADDR));
f7b422b1
DH		 611
612 return 0;
613}
614
615/*
616 * Present statistical information for this VFS mountpoint
617 */
618static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
619{
620 int i, cpu;
621 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
622 struct rpc_auth *auth = nfss->client->cl_auth;
623 struct nfs_iostats totals = { };
624
625 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
626
627 /*
628 * Display all mount option settings
629 */
630 seq_printf(m, "\n\topts:\t");
631 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
632 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
633 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
634 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
635 nfs_show_mount_options(m, nfss, 1);
636
637 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
638
639 seq_printf(m, "\n\tcaps:\t");
640 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 641 seq_printf(m, ",wtmult=%u", nfss->wtmult);
642 seq_printf(m, ",dtsize=%u", nfss->dtsize);
643 seq_printf(m, ",bsize=%u", nfss->bsize);
644 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 645
646#ifdef CONFIG_NFS_V4
40c55319 647 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 648 seq_printf(m, "\n\tnfsv4:\t");
649 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
650 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
651 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
652 }
653#endif
654
655 /*
656 * Display security flavor in effect for this mount
657 */
2d767432 658 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 659 if (auth->au_flavor)
2d767432 660 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 661
662 /*
663 * Display superblock I/O counters
664 */
665 for_each_possible_cpu(cpu) {
666 struct nfs_iostats *stats;
667
668 preempt_disable();
669 stats = per_cpu_ptr(nfss->io_stats, cpu);
670
671 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
672 totals.events[i] += stats->events[i];
673 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
674 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 675#ifdef CONFIG_NFS_FSCACHE
676 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
677 totals.fscache[i] += stats->fscache[i];
678#endif
f7b422b1
DH		 679
680 preempt_enable();
681 }
682
683 seq_printf(m, "\n\tevents:\t");
684 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
685 seq_printf(m, "%lu ", totals.events[i]);
686 seq_printf(m, "\n\tbytes:\t");
687 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
688 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 689#ifdef CONFIG_NFS_FSCACHE
690 if (nfss->options & NFS_OPTION_FSCACHE) {
691 seq_printf(m, "\n\tfsc:\t");
692 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
693 seq_printf(m, "%Lu ", totals.bytes[i]);
694 }
695#endif
f7b422b1
DH		 696 seq_printf(m, "\n");
697
698 rpc_print_iostats(m, nfss->client);
699
700 return 0;
701}
702
703/*
704 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 705 * in response to xdev traversals and referrals
f7b422b1 706 */
42faad99 707static void nfs_umount_begin(struct super_block *sb)
f7b422b1 708{
67e55205 709 struct nfs_server *server;
fc6ae3cf
TM		 710 struct rpc_clnt *rpc;
711
67e55205
AIB		 712 lock_kernel();
713
714 server = NFS_SB(sb);
fc6ae3cf
TM		 715 /* -EIO all pending I/O */
716 rpc = server->client_acl;
717 if (!IS_ERR(rpc))
718 rpc_killall_tasks(rpc);
719 rpc = server->client;
720 if (!IS_ERR(rpc))
721 rpc_killall_tasks(rpc);
67e55205
AIB		 722
723 unlock_kernel();
f7b422b1
DH		 724}
725
fc50d58f 726/*
cdcd7f9a
CL		 727 * Sanity-check a server address provided by the mount command.
728 *
729 * Address family must be initialized, and address must not be
730 * the ANY address for that family.
fc50d58f
CL		 731 */
732static int nfs_verify_server_address(struct sockaddr *addr)
733{
734 switch (addr->sa_family) {
735 case AF_INET: {
cdcd7f9a 736 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 737 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 738 }
739 case AF_INET6: {
740 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
741 return !ipv6_addr_any(sa);
fc50d58f
CL		 742 }
743 }
744
745 return 0;
746}
747
ce3b7e19
CL		 748static void nfs_parse_ipv4_address(char *string, size_t str_len,
749 struct sockaddr *sap, size_t *addr_len)
9412b927 750{
ce3b7e19
CL		 751 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
752 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
9412b927 753
ce3b7e19
CL		 754 if (str_len <= INET_ADDRSTRLEN) {
755 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
756 (int)str_len, string);
757
758 sin->sin_family = AF_INET;
759 *addr_len = sizeof(*sin);
760 if (in4_pton(string, str_len, addr, '\0', NULL))
3c7c7e48 761 return;
ce3b7e19
CL		 762 }
763
764 sap->sa_family = AF_UNSPEC;
765 *addr_len = 0;
766}
767
768#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5e2e7721
CL		 769static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
770 const char *delim,
771 struct sockaddr_in6 *sin6)
d8e7748a
CL		 772{
773 char *p;
774 size_t len;
775
5e2e7721
CL		 776 if ((string + str_len) == delim)
777 return 1;
778
d8e7748a 779 if (*delim != IPV6_SCOPE_DELIMITER)
5e2e7721
CL		 780 return 0;
781
782 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
783 return 0;
d8e7748a
CL		 784
785 len = (string + str_len) - delim - 1;
786 p = kstrndup(delim + 1, len, GFP_KERNEL);
787 if (p) {
788 unsigned long scope_id = 0;
789 struct net_device *dev;
790
791 dev = dev_get_by_name(&init_net, p);
792 if (dev != NULL) {
793 scope_id = dev->ifindex;
794 dev_put(dev);
795 } else {
5e2e7721
CL		 796 if (strict_strtoul(p, 10, &scope_id) == 0) {
797 kfree(p);
798 return 0;
799 }
d8e7748a
CL		 800 }
801
802 kfree(p);
5e2e7721 803
d8e7748a
CL		 804 sin6->sin6_scope_id = scope_id;
805 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
5e2e7721 806 return 1;
d8e7748a 807 }
5e2e7721
CL		 808
809 return 0;
d8e7748a
CL		 810}
811
ce3b7e19
CL		 812static void nfs_parse_ipv6_address(char *string, size_t str_len,
813 struct sockaddr *sap, size_t *addr_len)
814{
815 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
816 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
d8e7748a 817 const char *delim;
ce3b7e19
CL		 818
819 if (str_len <= INET6_ADDRSTRLEN) {
820 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
821 (int)str_len, string);
3c7c7e48 822
ce3b7e19
CL		 823 sin6->sin6_family = AF_INET6;
824 *addr_len = sizeof(*sin6);
5e2e7721
CL		 825 if (in6_pton(string, str_len, addr,
826 IPV6_SCOPE_DELIMITER, &delim) != 0) {
827 if (nfs_parse_ipv6_scope_id(string, str_len,
828 delim, sin6) != 0)
829 return;
d8e7748a 830 }
3c7c7e48 831 }
9412b927
CL		 832
833 sap->sa_family = AF_UNSPEC;
ce3b7e19
CL		 834 *addr_len = 0;
835}
836#else
837static void nfs_parse_ipv6_address(char *string, size_t str_len,
838 struct sockaddr *sap, size_t *addr_len)
839{
840 sap->sa_family = AF_UNSPEC;
841 *addr_len = 0;
842}
843#endif
844
845/*
846 * Construct a sockaddr based on the contents of a string that contains
847 * an IP address in presentation format.
848 *
849 * If there is a problem constructing the new sockaddr, set the address
850 * family to AF_UNSPEC.
851 */
ea31a443 852void nfs_parse_ip_address(char *string, size_t str_len,
ce3b7e19
CL		 853 struct sockaddr *sap, size_t *addr_len)
854{
855 unsigned int i, colons;
856
857 colons = 0;
858 for (i = 0; i < str_len; i++)
859 if (string[i] == ':')
860 colons++;
861
862 if (colons >= 2)
863 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
864 else
865 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
9412b927
CL		 866}
867
259875ef
TM		 868/*
869 * Sanity check the NFS transport protocol.
870 *
871 */
872static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
873{
874 switch (mnt->nfs_server.protocol) {
875 case XPRT_TRANSPORT_UDP:
876 case XPRT_TRANSPORT_TCP:
877 case XPRT_TRANSPORT_RDMA:
878 break;
879 default:
880 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
881 }
882}
883
884/*
885 * For text based NFSv2/v3 mounts, the mount protocol transport default
886 * settings should depend upon the specified NFS transport.
887 */
888static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
889{
890 nfs_validate_transport_protocol(mnt);
891
892 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
893 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
894 return;
895 switch (mnt->nfs_server.protocol) {
896 case XPRT_TRANSPORT_UDP:
897 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
898 break;
899 case XPRT_TRANSPORT_TCP:
900 case XPRT_TRANSPORT_RDMA:
901 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
902 }
903}
904
01060c89
CL		 905/*
906 * Parse the value of the 'sec=' option.
907 *
dd07c947 908 * The flavor_len setting is for v4 mounts.
01060c89
CL		 909 */
910static int nfs_parse_security_flavors(char *value,
911 struct nfs_parsed_mount_data *mnt)
912{
913 substring_t args[MAX_OPT_ARGS];
914
915 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
916
917 switch (match_token(value, nfs_secflavor_tokens, args)) {
918 case Opt_sec_none:
01060c89
CL		 919 mnt->auth_flavor_len = 0;
920 mnt->auth_flavors[0] = RPC_AUTH_NULL;
921 break;
922 case Opt_sec_sys:
01060c89
CL		 923 mnt->auth_flavor_len = 0;
924 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
925 break;
926 case Opt_sec_krb5:
01060c89
CL		 927 mnt->auth_flavor_len = 1;
928 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
929 break;
930 case Opt_sec_krb5i:
01060c89
CL		 931 mnt->auth_flavor_len = 1;
932 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
933 break;
934 case Opt_sec_krb5p:
01060c89
CL		 935 mnt->auth_flavor_len = 1;
936 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
937 break;
938 case Opt_sec_lkey:
01060c89
CL		 939 mnt->auth_flavor_len = 1;
940 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
941 break;
942 case Opt_sec_lkeyi:
01060c89
CL		 943 mnt->auth_flavor_len = 1;
944 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
945 break;
946 case Opt_sec_lkeyp:
01060c89
CL		 947 mnt->auth_flavor_len = 1;
948 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
949 break;
950 case Opt_sec_spkm:
01060c89
CL		 951 mnt->auth_flavor_len = 1;
952 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
953 break;
954 case Opt_sec_spkmi:
01060c89
CL		 955 mnt->auth_flavor_len = 1;
956 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
957 break;
958 case Opt_sec_spkmp:
01060c89
CL		 959 mnt->auth_flavor_len = 1;
960 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
961 break;
962 default:
963 return 0;
964 }
965
966 return 1;
967}
968
bf0fd768
CL		 969/*
970 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 971 * a data structure. The whole mount string is processed; bad options are
972 * skipped as they are encountered. If there were no errors, return 1;
973 * otherwise return 0 (zero).
bf0fd768
CL		 974 */
975static int nfs_parse_mount_options(char *raw,
976 struct nfs_parsed_mount_data *mnt)
977{
f9c3a380 978 char *p, *string, *secdata;
d23c45fd 979 int rc, sloppy = 0, invalid_option = 0;
bf0fd768
CL		 980
981 if (!raw) {
982 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
983 return 1;
984 }
985 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
986
f9c3a380
EP		 987 secdata = alloc_secdata();
988 if (!secdata)
989 goto out_nomem;
990
991 rc = security_sb_copy_data(raw, secdata);
992 if (rc)
993 goto out_security_failure;
994
995 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
996 if (rc)
997 goto out_security_failure;
998
999 free_secdata(secdata);
1000
bf0fd768
CL		 1001 while ((p = strsep(&raw, ",")) != NULL) {
1002 substring_t args[MAX_OPT_ARGS];
a5a16bae 1003 unsigned long option;
1f84603c 1004 int int_option;
a5a16bae 1005 int token;
bf0fd768
CL		 1006
1007 if (!*p)
1008 continue;
1009
1010 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1011
1012 token = match_token(p, nfs_mount_option_tokens, args);
1013 switch (token) {
f45663ce
CL		 1014
1015 /*
1016 * boolean options: foo/nofoo
1017 */
bf0fd768
CL		 1018 case Opt_soft:
1019 mnt->flags |= NFS_MOUNT_SOFT;
1020 break;
1021 case Opt_hard:
1022 mnt->flags &= ~NFS_MOUNT_SOFT;
1023 break;
bf0fd768
CL		 1024 case Opt_posix:
1025 mnt->flags |= NFS_MOUNT_POSIX;
1026 break;
1027 case Opt_noposix:
1028 mnt->flags &= ~NFS_MOUNT_POSIX;
1029 break;
1030 case Opt_cto:
1031 mnt->flags &= ~NFS_MOUNT_NOCTO;
1032 break;
1033 case Opt_nocto:
1034 mnt->flags |= NFS_MOUNT_NOCTO;
1035 break;
1036 case Opt_ac:
1037 mnt->flags &= ~NFS_MOUNT_NOAC;
1038 break;
1039 case Opt_noac:
1040 mnt->flags |= NFS_MOUNT_NOAC;
1041 break;
1042 case Opt_lock:
1043 mnt->flags &= ~NFS_MOUNT_NONLM;
1044 break;
1045 case Opt_nolock:
1046 mnt->flags |= NFS_MOUNT_NONLM;
1047 break;
1048 case Opt_v2:
1049 mnt->flags &= ~NFS_MOUNT_VER3;
1050 break;
1051 case Opt_v3:
1052 mnt->flags |= NFS_MOUNT_VER3;
1053 break;
1054 case Opt_udp:
1055 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1056 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1057 break;
1058 case Opt_tcp:
1059 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1060 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1061 break;
2cf7ff7a
TT		 1062 case Opt_rdma:
1063 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1064 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1065 xprt_load_transport(p);
2cf7ff7a 1066 break;
bf0fd768
CL		 1067 case Opt_acl:
1068 mnt->flags &= ~NFS_MOUNT_NOACL;
1069 break;
1070 case Opt_noacl:
1071 mnt->flags |= NFS_MOUNT_NOACL;
1072 break;
1073 case Opt_rdirplus:
1074 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1075 break;
1076 case Opt_nordirplus:
1077 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1078 break;
75180df2
TM		 1079 case Opt_sharecache:
1080 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1081 break;
1082 case Opt_nosharecache:
1083 mnt->flags |= NFS_MOUNT_UNSHARED;
1084 break;
d740351b
CL		 1085 case Opt_resvport:
1086 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1087 break;
1088 case Opt_noresvport:
1089 mnt->flags |= NFS_MOUNT_NORESVPORT;
1090 break;
b797cac7
DH		 1091 case Opt_fscache:
1092 mnt->options |= NFS_OPTION_FSCACHE;
1093 kfree(mnt->fscache_uniq);
1094 mnt->fscache_uniq = NULL;
1095 break;
1096 case Opt_nofscache:
1097 mnt->options &= ~NFS_OPTION_FSCACHE;
1098 kfree(mnt->fscache_uniq);
1099 mnt->fscache_uniq = NULL;
1100 break;
1101 case Opt_fscache_uniq:
1102 string = match_strdup(args);
1103 if (!string)
1104 goto out_nomem;
1105 kfree(mnt->fscache_uniq);
1106 mnt->fscache_uniq = string;
1107 mnt->options |= NFS_OPTION_FSCACHE;
1108 break;
bf0fd768 1109
f45663ce
CL		 1110 /*
1111 * options that take numeric values
1112 */
bf0fd768 1113 case Opt_port:
a5a16bae
CL		 1114 string = match_strdup(args);
1115 if (string == NULL)
1116 goto out_nomem;
1117 rc = strict_strtoul(string, 10, &option);
1118 kfree(string);
1119 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1120 goto out_invalid_value;
1121 mnt->nfs_server.port = option;
bf0fd768
CL		 1122 break;
1123 case Opt_rsize:
a5a16bae
CL		 1124 string = match_strdup(args);
1125 if (string == NULL)
1126 goto out_nomem;
1127 rc = strict_strtoul(string, 10, &option);
1128 kfree(string);
1129 if (rc != 0)
d23c45fd
CL		 1130 goto out_invalid_value;
1131 mnt->rsize = option;
bf0fd768
CL		 1132 break;
1133 case Opt_wsize:
a5a16bae
CL		 1134 string = match_strdup(args);
1135 if (string == NULL)
1136 goto out_nomem;
1137 rc = strict_strtoul(string, 10, &option);
1138 kfree(string);
1139 if (rc != 0)
d23c45fd
CL		 1140 goto out_invalid_value;
1141 mnt->wsize = option;
bf0fd768
CL		 1142 break;
1143 case Opt_bsize:
a5a16bae
CL		 1144 string = match_strdup(args);
1145 if (string == NULL)
1146 goto out_nomem;
1147 rc = strict_strtoul(string, 10, &option);
1148 kfree(string);
1149 if (rc != 0)
d23c45fd
CL		 1150 goto out_invalid_value;
1151 mnt->bsize = option;
bf0fd768
CL		 1152 break;
1153 case Opt_timeo:
a5a16bae
CL		 1154 string = match_strdup(args);
1155 if (string == NULL)
1156 goto out_nomem;
1157 rc = strict_strtoul(string, 10, &option);
1158 kfree(string);
1159 if (rc != 0 || option == 0)
d23c45fd
CL		 1160 goto out_invalid_value;
1161 mnt->timeo = option;
bf0fd768
CL		 1162 break;
1163 case Opt_retrans:
a5a16bae
CL		 1164 string = match_strdup(args);
1165 if (string == NULL)
1166 goto out_nomem;
1167 rc = strict_strtoul(string, 10, &option);
1168 kfree(string);
1169 if (rc != 0 || option == 0)
d23c45fd
CL		 1170 goto out_invalid_value;
1171 mnt->retrans = option;
bf0fd768
CL		 1172 break;
1173 case Opt_acregmin:
a5a16bae
CL		 1174 string = match_strdup(args);
1175 if (string == NULL)
1176 goto out_nomem;
1177 rc = strict_strtoul(string, 10, &option);
1178 kfree(string);
1179 if (rc != 0)
d23c45fd
CL		 1180 goto out_invalid_value;
1181 mnt->acregmin = option;
bf0fd768
CL		 1182 break;
1183 case Opt_acregmax:
a5a16bae
CL		 1184 string = match_strdup(args);
1185 if (string == NULL)
1186 goto out_nomem;
1187 rc = strict_strtoul(string, 10, &option);
1188 kfree(string);
1189 if (rc != 0)
d23c45fd
CL		 1190 goto out_invalid_value;
1191 mnt->acregmax = option;
bf0fd768
CL		 1192 break;
1193 case Opt_acdirmin:
a5a16bae
CL		 1194 string = match_strdup(args);
1195 if (string == NULL)
1196 goto out_nomem;
1197 rc = strict_strtoul(string, 10, &option);
1198 kfree(string);
1199 if (rc != 0)
d23c45fd
CL		 1200 goto out_invalid_value;
1201 mnt->acdirmin = option;
bf0fd768
CL		 1202 break;
1203 case Opt_acdirmax:
a5a16bae
CL		 1204 string = match_strdup(args);
1205 if (string == NULL)
1206 goto out_nomem;
1207 rc = strict_strtoul(string, 10, &option);
1208 kfree(string);
1209 if (rc != 0)
d23c45fd
CL		 1210 goto out_invalid_value;
1211 mnt->acdirmax = option;
bf0fd768
CL		 1212 break;
1213 case Opt_actimeo:
a5a16bae
CL		 1214 string = match_strdup(args);
1215 if (string == NULL)
1216 goto out_nomem;
1217 rc = strict_strtoul(string, 10, &option);
1218 kfree(string);
1219 if (rc != 0)
d23c45fd
CL		 1220 goto out_invalid_value;
1221 mnt->acregmin = mnt->acregmax =
1222 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1223 break;
1224 case Opt_namelen:
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
CL		 1231 goto out_invalid_value;
1232 mnt->namlen = option;
bf0fd768
CL		 1233 break;
1234 case Opt_mountport:
a5a16bae
CL		 1235 string = match_strdup(args);
1236 if (string == NULL)
1237 goto out_nomem;
1238 rc = strict_strtoul(string, 10, &option);
1239 kfree(string);
1240 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1241 goto out_invalid_value;
1242 mnt->mount_server.port = option;
bf0fd768 1243 break;
bf0fd768 1244 case Opt_mountvers:
a5a16bae
CL		 1245 string = match_strdup(args);
1246 if (string == NULL)
1247 goto out_nomem;
1248 rc = strict_strtoul(string, 10, &option);
1249 kfree(string);
1250 if (rc != 0 ||
f45663ce 1251 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1252 option > NFS_MNT3_VERSION)
1253 goto out_invalid_value;
1254 mnt->mount_server.version = option;
bf0fd768 1255 break;
bf0fd768 1256 case Opt_nfsvers:
a5a16bae
CL		 1257 string = match_strdup(args);
1258 if (string == NULL)
1259 goto out_nomem;
1260 rc = strict_strtoul(string, 10, &option);
1261 kfree(string);
1262 if (rc != 0)
d23c45fd 1263 goto out_invalid_value;
bf0fd768 1264 switch (option) {
f45663ce 1265 case NFS2_VERSION:
bf0fd768
CL		 1266 mnt->flags &= ~NFS_MOUNT_VER3;
1267 break;
f45663ce 1268 case NFS3_VERSION:
bf0fd768
CL		 1269 mnt->flags |= NFS_MOUNT_VER3;
1270 break;
1271 default:
d23c45fd 1272 goto out_invalid_value;
bf0fd768
CL		 1273 }
1274 break;
3fd5be9e 1275 case Opt_minorversion:
1f84603c 1276 if (match_int(args, &int_option))
3fd5be9e 1277 return 0;
1f84603c 1278 if (int_option < 0 || int_option > NFS4_MAX_MINOR_VERSION)
3fd5be9e 1279 return 0;
1f84603c 1280 mnt->minorversion = int_option;
3fd5be9e 1281 break;
bf0fd768 1282
f45663ce
CL		 1283 /*
1284 * options that take text values
1285 */
bf0fd768
CL		 1286 case Opt_sec:
1287 string = match_strdup(args);
1288 if (string == NULL)
1289 goto out_nomem;
01060c89 1290 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1291 kfree(string);
f45663ce 1292 if (!rc) {
f45663ce
CL		 1293 dfprintk(MOUNT, "NFS: unrecognized "
1294 "security flavor\n");
d23c45fd 1295 return 0;
f45663ce 1296 }
bf0fd768
CL		 1297 break;
1298 case Opt_proto:
1299 string = match_strdup(args);
1300 if (string == NULL)
1301 goto out_nomem;
1302 token = match_token(string,
1303 nfs_xprt_protocol_tokens, args);
bf0fd768
CL		 1304
1305 switch (token) {
fdb66ff4 1306 case Opt_xprt_udp:
bf0fd768 1307 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1308 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1309 kfree(string);
bf0fd768 1310 break;
fdb66ff4 1311 case Opt_xprt_tcp:
bf0fd768 1312 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1313 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1314 kfree(string);
bf0fd768 1315 break;
2cf7ff7a
TT		 1316 case Opt_xprt_rdma:
1317 /* vector side protocols to TCP */
1318 mnt->flags |= NFS_MOUNT_TCP;
1319 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1320 xprt_load_transport(string);
d23c45fd 1321 kfree(string);
2cf7ff7a 1322 break;
bf0fd768 1323 default:
f45663ce
CL		 1324 dfprintk(MOUNT, "NFS: unrecognized "
1325 "transport protocol\n");
d23c45fd 1326 return 0;
bf0fd768
CL		 1327 }
1328 break;
1329 case Opt_mountproto:
1330 string = match_strdup(args);
1331 if (string == NULL)
1332 goto out_nomem;
1333 token = match_token(string,
1334 nfs_xprt_protocol_tokens, args);
d508afb4 1335 kfree(string);
bf0fd768
CL		 1336
1337 switch (token) {
fdb66ff4 1338 case Opt_xprt_udp:
0896a725 1339 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1340 break;
fdb66ff4 1341 case Opt_xprt_tcp:
0896a725 1342 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1343 break;
2cf7ff7a 1344 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1345 default:
f45663ce
CL		 1346 dfprintk(MOUNT, "NFS: unrecognized "
1347 "transport protocol\n");
d23c45fd 1348 return 0;
bf0fd768
CL		 1349 }
1350 break;
1351 case Opt_addr:
1352 string = match_strdup(args);
1353 if (string == NULL)
1354 goto out_nomem;
ce3b7e19
CL		 1355 nfs_parse_ip_address(string, strlen(string),
1356 (struct sockaddr *)
1357 &mnt->nfs_server.address,
1358 &mnt->nfs_server.addrlen);
bf0fd768
CL		 1359 kfree(string);
1360 break;
1361 case Opt_clientaddr:
1362 string = match_strdup(args);
1363 if (string == NULL)
1364 goto out_nomem;
fc601477 1365 kfree(mnt->client_address);
bf0fd768
CL		 1366 mnt->client_address = string;
1367 break;
33832034
CL		 1368 case Opt_mounthost:
1369 string = match_strdup(args);
1370 if (string == NULL)
1371 goto out_nomem;
fc601477 1372 kfree(mnt->mount_server.hostname);
33832034
CL		 1373 mnt->mount_server.hostname = string;
1374 break;
0ac83779 1375 case Opt_mountaddr:
bf0fd768
CL		 1376 string = match_strdup(args);
1377 if (string == NULL)
1378 goto out_nomem;
ce3b7e19
CL		 1379 nfs_parse_ip_address(string, strlen(string),
1380 (struct sockaddr *)
1381 &mnt->mount_server.address,
1382 &mnt->mount_server.addrlen);
bf0fd768
CL		 1383 kfree(string);
1384 break;
7973c1f1
TM		 1385 case Opt_lookupcache:
1386 string = match_strdup(args);
1387 if (string == NULL)
1388 goto out_nomem;
1389 token = match_token(string,
1390 nfs_lookupcache_tokens, args);
1391 kfree(string);
1392 switch (token) {
1393 case Opt_lookupcache_all:
1394 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1395 break;
1396 case Opt_lookupcache_positive:
1397 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1398 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1399 break;
1400 case Opt_lookupcache_none:
1401 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1402 break;
1403 default:
7973c1f1
TM		 1404 dfprintk(MOUNT, "NFS: invalid "
1405 "lookupcache argument\n");
d23c45fd 1406 return 0;
7973c1f1
TM		 1407 };
1408 break;
bf0fd768 1409
f45663ce
CL		 1410 /*
1411 * Special options
1412 */
1413 case Opt_sloppy:
1414 sloppy = 1;
1415 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1416 break;
bf0fd768
CL		 1417 case Opt_userspace:
1418 case Opt_deprecated:
d33e4dfe
CL		 1419 dfprintk(MOUNT, "NFS: ignoring mount option "
1420 "'%s'\n", p);
bf0fd768
CL		 1421 break;
1422
1423 default:
d23c45fd 1424 invalid_option = 1;
f45663ce
CL		 1425 dfprintk(MOUNT, "NFS: unrecognized mount option "
1426 "'%s'\n", p);
bf0fd768
CL		 1427 }
1428 }
1429
d23c45fd
CL		 1430 if (!sloppy && invalid_option)
1431 return 0;
1432
bf0fd768
CL		 1433 return 1;
1434
d23c45fd
CL		 1435out_invalid_value:
1436 printk(KERN_INFO "NFS: bad mount option value specified: %s \n", p);
1437 return 0;
bf0fd768
CL		 1438out_nomem:
1439 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1440 return 0;
f9c3a380
EP		 1441out_security_failure:
1442 free_secdata(secdata);
1443 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1444 return 0;
bf0fd768
CL		 1445}
1446
0076d7b7
CL		 1447/*
1448 * Use the remote server's MOUNT service to request the NFS file handle
1449 * corresponding to the provided path.
1450 */
1451static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1452 struct nfs_fh *root_fh)
1453{
8e02f6b9 1454 unsigned int auth_flavor_len = 0;
c5d120f8
CL		 1455 struct nfs_mount_request request = {
1456 .sap = (struct sockaddr *)
1457 &args->mount_server.address,
1458 .dirpath = args->nfs_server.export_path,
1459 .protocol = args->mount_server.protocol,
1460 .fh = root_fh,
50a737f8 1461 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
8e02f6b9 1462 .auth_flav_len = &auth_flavor_len,
c5d120f8 1463 };
4c568017 1464 int status;
0076d7b7
CL		 1465
1466 if (args->mount_server.version == 0) {
1467 if (args->flags & NFS_MOUNT_VER3)
1468 args->mount_server.version = NFS_MNT3_VERSION;
1469 else
1470 args->mount_server.version = NFS_MNT_VERSION;
1471 }
c5d120f8 1472 request.version = args->mount_server.version;
0076d7b7 1473
33832034 1474 if (args->mount_server.hostname)
c5d120f8 1475 request.hostname = args->mount_server.hostname;
33832034 1476 else
c5d120f8 1477 request.hostname = args->nfs_server.hostname;
33832034 1478
0076d7b7
CL		 1479 /*
1480 * Construct the mount server's address.
1481 */
4c568017 1482 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1483 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1484 args->nfs_server.addrlen);
1485 args->mount_server.addrlen = args->nfs_server.addrlen;
1486 }
c5d120f8 1487 request.salen = args->mount_server.addrlen;
4c568017 1488
aad70007
JL		 1489 /*
1490 * autobind will be used if mount_server.port == 0
1491 */
c5d120f8 1492 nfs_set_port(request.sap, args->mount_server.port);
0076d7b7
CL		 1493
1494 /*
1495 * Now ask the mount server to map our export path
1496 * to a file handle.
1497 */
c5d120f8 1498 status = nfs_mount(&request);
efd8340b
CL		 1499 if (status == 0)
1500 return 0;
0076d7b7 1501
396cee97 1502 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
c5d120f8 1503 request.hostname, status);
0076d7b7
CL		 1504 return status;
1505}
1506
d1aa0825
CL		 1507static int nfs_parse_simple_hostname(const char *dev_name,
1508 char **hostname, size_t maxnamlen,
1509 char **export_path, size_t maxpathlen)
dc045898
CL		 1510{
1511 size_t len;
1512 char *colon, *comma;
1513
1514 colon = strchr(dev_name, ':');
1515 if (colon == NULL)
1516 goto out_bad_devname;
1517
1518 len = colon - dev_name;
1519 if (len > maxnamlen)
1520 goto out_hostname;
1521
1522 /* N.B. caller will free nfs_server.hostname in all cases */
1523 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1524 if (!*hostname)
1525 goto out_nomem;
1526
1527 /* kill possible hostname list: not supported */
1528 comma = strchr(*hostname, ',');
1529 if (comma != NULL) {
1530 if (comma == *hostname)
1531 goto out_bad_devname;
1532 *comma = '\0';
1533 }
1534
1535 colon++;
1536 len = strlen(colon);
1537 if (len > maxpathlen)
1538 goto out_path;
1539 *export_path = kstrndup(colon, len, GFP_KERNEL);
1540 if (!*export_path)
1541 goto out_nomem;
1542
1543 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1544 return 0;
1545
1546out_bad_devname:
1547 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1548 return -EINVAL;
1549
1550out_nomem:
1551 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1552 return -ENOMEM;
1553
1554out_hostname:
1555 dfprintk(MOUNT, "NFS: server hostname too long\n");
1556 return -ENAMETOOLONG;
1557
1558out_path:
1559 dfprintk(MOUNT, "NFS: export pathname too long\n");
1560 return -ENAMETOOLONG;
1561}
1562
d1aa0825
CL		 1563/*
1564 * Hostname has square brackets around it because it contains one or
1565 * more colons. We look for the first closing square bracket, and a
1566 * colon must follow it.
1567 */
1568static int nfs_parse_protected_hostname(const char *dev_name,
1569 char **hostname, size_t maxnamlen,
1570 char **export_path, size_t maxpathlen)
1571{
1572 size_t len;
1573 char *start, *end;
1574
1575 start = (char *)(dev_name + 1);
1576
1577 end = strchr(start, ']');
1578 if (end == NULL)
1579 goto out_bad_devname;
1580 if (*(end + 1) != ':')
1581 goto out_bad_devname;
1582
1583 len = end - start;
1584 if (len > maxnamlen)
1585 goto out_hostname;
1586
1587 /* N.B. caller will free nfs_server.hostname in all cases */
1588 *hostname = kstrndup(start, len, GFP_KERNEL);
1589 if (*hostname == NULL)
1590 goto out_nomem;
1591
1592 end += 2;
1593 len = strlen(end);
1594 if (len > maxpathlen)
1595 goto out_path;
1596 *export_path = kstrndup(end, len, GFP_KERNEL);
1597 if (!*export_path)
1598 goto out_nomem;
1599
1600 return 0;
1601
1602out_bad_devname:
1603 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1604 return -EINVAL;
1605
1606out_nomem:
1607 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1608 return -ENOMEM;
1609
1610out_hostname:
1611 dfprintk(MOUNT, "NFS: server hostname too long\n");
1612 return -ENAMETOOLONG;
1613
1614out_path:
1615 dfprintk(MOUNT, "NFS: export pathname too long\n");
1616 return -ENAMETOOLONG;
1617}
1618
1619/*
1620 * Split "dev_name" into "hostname:export_path".
1621 *
1622 * The leftmost colon demarks the split between the server's hostname
1623 * and the export path. If the hostname starts with a left square
1624 * bracket, then it may contain colons.
1625 *
1626 * Note: caller frees hostname and export path, even on error.
1627 */
1628static int nfs_parse_devname(const char *dev_name,
1629 char **hostname, size_t maxnamlen,
1630 char **export_path, size_t maxpathlen)
1631{
1632 if (*dev_name == '[')
1633 return nfs_parse_protected_hostname(dev_name,
1634 hostname, maxnamlen,
1635 export_path, maxpathlen);
1636
1637 return nfs_parse_simple_hostname(dev_name,
1638 hostname, maxnamlen,
1639 export_path, maxpathlen);
1640}
1641
f7b422b1 1642/*
54ceac45
DH		 1643 * Validate the NFS2/NFS3 mount data
1644 * - fills in the mount root filehandle
136d558c
CL		 1645 *
1646 * For option strings, user space handles the following behaviors:
1647 *
1648 * + DNS: mapping server host name to IP address ("addr=" option)
1649 *
1650 * + failure mode: how to behave if a mount request can't be handled
1651 * immediately ("fg/bg" option)
1652 *
1653 * + retry: how often to retry a mount request ("retry=" option)
1654 *
1655 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1656 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1657 */
2283f8d6
TT		 1658static int nfs_validate_mount_data(void *options,
1659 struct nfs_parsed_mount_data *args,
136d558c
CL		 1660 struct nfs_fh *mntfh,
1661 const char *dev_name)
f7b422b1 1662{
2283f8d6 1663 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
136d558c 1664
5df36e78
CL		 1665 if (data == NULL)
1666 goto out_no_data;
f7b422b1 1667
2283f8d6
TT		 1668 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1669 args->rsize = NFS_MAX_FILE_IO_SIZE;
1670 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1671 args->acregmin = NFS_DEF_ACREGMIN;
1672 args->acregmax = NFS_DEF_ACREGMAX;
1673 args->acdirmin = NFS_DEF_ACDIRMIN;
1674 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 1675 args->mount_server.port = 0; /* autobind unless user sets port */
f22d6d79 1676 args->nfs_server.port = 0; /* autobind unless user sets port */
0896a725 1677 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1678 args->auth_flavors[0] = RPC_AUTH_UNIX;
2283f8d6 1679
54ceac45 1680 switch (data->version) {
5df36e78
CL		 1681 case 1:
1682 data->namlen = 0;
1683 case 2:
1684 data->bsize = 0;
1685 case 3:
1686 if (data->flags & NFS_MOUNT_VER3)
1687 goto out_no_v3;
1688 data->root.size = NFS2_FHSIZE;
1689 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1690 case 4:
1691 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1692 goto out_no_sec;
1693 case 5:
1694 memset(data->context, 0, sizeof(data->context));
1695 case 6:
b7e24457
TM		 1696 if (data->flags & NFS_MOUNT_VER3) {
1697 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1698 goto out_invalid_fh;
5df36e78 1699 mntfh->size = data->root.size;
b7e24457 1700 } else
5df36e78
CL		 1701 mntfh->size = NFS2_FHSIZE;
1702
5df36e78
CL		 1703
1704 memcpy(mntfh->data, data->root.data, mntfh->size);
1705 if (mntfh->size < sizeof(mntfh->data))
1706 memset(mntfh->data + mntfh->size, 0,
1707 sizeof(mntfh->data) - mntfh->size);
6e88e061 1708
2283f8d6
TT		 1709 /*
1710 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1711 * can deal with.
1712 */
ff3525a5 1713 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1714 args->rsize = data->rsize;
1715 args->wsize = data->wsize;
2283f8d6
TT		 1716 args->timeo = data->timeo;
1717 args->retrans = data->retrans;
1718 args->acregmin = data->acregmin;
1719 args->acregmax = data->acregmax;
1720 args->acdirmin = data->acdirmin;
1721 args->acdirmax = data->acdirmax;
4c568017
CL		 1722
1723 memcpy(&args->nfs_server.address, &data->addr,
1724 sizeof(data->addr));
1725 args->nfs_server.addrlen = sizeof(data->addr);
1726 if (!nfs_verify_server_address((struct sockaddr *)
1727 &args->nfs_server.address))
1728 goto out_no_address;
1729
2283f8d6 1730 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1731 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1732 /* N.B. caller will free nfs_server.hostname in all cases */
1733 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1734 args->namlen = data->namlen;
1735 args->bsize = data->bsize;
dd07c947
CL		 1736
1737 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1738 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1739 if (!args->nfs_server.hostname)
1740 goto out_nomem;
f9c3a380
EP		 1741
1742 /*
1743 * The legacy version 6 binary mount data from userspace has a
1744 * field used only to transport selinux information into the
1745 * the kernel. To continue to support that functionality we
1746 * have a touch of selinux knowledge here in the NFS code. The
1747 * userspace code converted context=blah to just blah so we are
1748 * converting back to the full string selinux understands.
1749 */
1750 if (data->context[0]){
1751#ifdef CONFIG_SECURITY_SELINUX
1752 int rc;
1753 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1754 if (!opts_str)
1755 return -ENOMEM;
1756 strcpy(opts_str, "context=");
1757 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1758 strcat(opts_str, &data->context[0]);
1759 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1760 kfree(opts_str);
1761 if (rc)
1762 return rc;
1763#else
1764 return -EINVAL;
1765#endif
1766 }
1767
5df36e78 1768 break;
136d558c 1769 default: {
136d558c 1770 int status;
136d558c 1771
2283f8d6
TT		 1772 if (nfs_parse_mount_options((char *)options, args) == 0)
1773 return -EINVAL;
136d558c 1774
6e88e061
CL		 1775 if (!nfs_verify_server_address((struct sockaddr *)
1776 &args->nfs_server.address))
1777 goto out_no_address;
1778
ed596a8a
CL		 1779 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1780 args->nfs_server.port);
1781
259875ef
TM		 1782 nfs_set_mount_transport_protocol(args);
1783
dc045898
CL		 1784 status = nfs_parse_devname(dev_name,
1785 &args->nfs_server.hostname,
1786 PAGE_SIZE,
1787 &args->nfs_server.export_path,
1788 NFS_MAXPATHLEN);
1789 if (!status)
1790 status = nfs_try_mount(args, mntfh);
136d558c 1791
dc045898
CL		 1792 kfree(args->nfs_server.export_path);
1793 args->nfs_server.export_path = NULL;
136d558c 1794
136d558c 1795 if (status)
fdc6e2c8 1796 return status;
136d558c 1797
136d558c
CL		 1798 break;
1799 }
f7b422b1 1800 }
54ceac45
DH		 1801
1802#ifndef CONFIG_NFS_V3
2283f8d6 1803 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1804 goto out_v3_not_compiled;
1805#endif /* !CONFIG_NFS_V3 */
f7b422b1 1806
5df36e78 1807 return 0;
f7b422b1 1808
5df36e78
CL		 1809out_no_data:
1810 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1811 return -EINVAL;
54ceac45 1812
5df36e78
CL		 1813out_no_v3:
1814 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1815 data->version);
1816 return -EINVAL;
f7b422b1 1817
5df36e78
CL		 1818out_no_sec:
1819 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1820 return -EINVAL;
1821
5df36e78
CL		 1822#ifndef CONFIG_NFS_V3
1823out_v3_not_compiled:
1824 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1825 return -EPROTONOSUPPORT;
1826#endif /* !CONFIG_NFS_V3 */
1827
63649bd7
CG		 1828out_nomem:
1829 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1830 return -ENOMEM;
1831
5df36e78
CL		 1832out_no_address:
1833 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1834 return -EINVAL;
1835
1836out_invalid_fh:
1837 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1838 return -EINVAL;
f7b422b1
DH		 1839}
1840
48b605f8
JL		 1841static int
1842nfs_compare_remount_data(struct nfs_server *nfss,
1843 struct nfs_parsed_mount_data *data)
1844{
1845 if (data->flags != nfss->flags ||
1846 data->rsize != nfss->rsize ||
1847 data->wsize != nfss->wsize ||
1848 data->retrans != nfss->client->cl_timeout->to_retries ||
1849 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1850 data->acregmin != nfss->acregmin / HZ ||
1851 data->acregmax != nfss->acregmax / HZ ||
1852 data->acdirmin != nfss->acdirmin / HZ ||
1853 data->acdirmax != nfss->acdirmax / HZ ||
1854 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1855 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1856 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1857 data->nfs_server.addrlen) != 0)
1858 return -EINVAL;
1859
1860 return 0;
1861}
1862
1863static int
1864nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1865{
1866 int error;
1867 struct nfs_server *nfss = sb->s_fs_info;
1868 struct nfs_parsed_mount_data *data;
1869 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1870 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1871 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1872
1873 /*
1874 * Userspace mount programs that send binary options generally send
1875 * them populated with default values. We have no way to know which
1876 * ones were explicitly specified. Fall back to legacy behavior and
1877 * just return success.
1878 */
31c94469
MZ		 1879 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1880 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1881 options->version <= 6))))
48b605f8
JL		 1882 return 0;
1883
1884 data = kzalloc(sizeof(*data), GFP_KERNEL);
1885 if (data == NULL)
1886 return -ENOMEM;
1887
337eb00a 1888 lock_kernel();
48b605f8
JL		 1889 /* fill out struct with values from existing mount */
1890 data->flags = nfss->flags;
1891 data->rsize = nfss->rsize;
1892 data->wsize = nfss->wsize;
1893 data->retrans = nfss->client->cl_timeout->to_retries;
1894 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1895 data->acregmin = nfss->acregmin / HZ;
1896 data->acregmax = nfss->acregmax / HZ;
1897 data->acdirmin = nfss->acdirmin / HZ;
1898 data->acdirmax = nfss->acdirmax / HZ;
1899 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1900 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1901 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1902 data->nfs_server.addrlen);
1903
1904 /* overwrite those values with any that were specified */
1905 error = nfs_parse_mount_options((char *)options, data);
1906 if (error < 0)
1907 goto out;
1908
1909 /* compare new mount options with old ones */
1910 error = nfs_compare_remount_data(nfss, data);
1911out:
1912 kfree(data);
337eb00a 1913 unlock_kernel();
48b605f8
JL		 1914 return error;
1915}
1916
f7b422b1 1917/*
54ceac45 1918 * Initialise the common bits of the superblock
f7b422b1 1919 */
54ceac45 1920static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1921{
54ceac45 1922 struct nfs_server *server = NFS_SB(sb);
5006a76c 1923
54ceac45 1924 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1925
54ceac45
DH		 1926 /* We probably want something more informative here */
1927 snprintf(sb->s_id, sizeof(sb->s_id),
1928 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1929
54ceac45
DH		 1930 if (sb->s_blocksize == 0)
1931 sb->s_blocksize = nfs_block_bits(server->wsize,
1932 &sb->s_blocksize_bits);
f7b422b1 1933
54ceac45
DH		 1934 if (server->flags & NFS_MOUNT_NOAC)
1935 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1936
54ceac45 1937 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1938}
1939
1940/*
54ceac45 1941 * Finish setting up an NFS2/3 superblock
f7b422b1 1942 */
2283f8d6
TT		 1943static void nfs_fill_super(struct super_block *sb,
1944 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1945{
1946 struct nfs_server *server = NFS_SB(sb);
5006a76c 1947
54ceac45
DH		 1948 sb->s_blocksize_bits = 0;
1949 sb->s_blocksize = 0;
1950 if (data->bsize)
1951 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1952
54ceac45
DH		 1953 if (server->flags & NFS_MOUNT_VER3) {
1954 /* The VFS shouldn't apply the umask to mode bits. We will do
1955 * so ourselves when necessary.
1956 */
1957 sb->s_flags |= MS_POSIXACL;
1958 sb->s_time_gran = 1;
816724e6 1959 }
54ceac45
DH		 1960
1961 sb->s_op = &nfs_sops;
1962 nfs_initialise_sb(sb);
f7b422b1
DH		 1963}
1964
1965/*
54ceac45 1966 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1967 */
54ceac45
DH		 1968static void nfs_clone_super(struct super_block *sb,
1969 const struct super_block *old_sb)
f7b422b1 1970{
54ceac45
DH		 1971 struct nfs_server *server = NFS_SB(sb);
1972
1973 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1974 sb->s_blocksize = old_sb->s_blocksize;
1975 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1976
f7b422b1 1977 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1978 /* The VFS shouldn't apply the umask to mode bits. We will do
1979 * so ourselves when necessary.
f7b422b1
DH		 1980 */
1981 sb->s_flags |= MS_POSIXACL;
f7b422b1 1982 sb->s_time_gran = 1;
f7b422b1
DH		 1983 }
1984
54ceac45
DH		 1985 sb->s_op = old_sb->s_op;
1986 nfs_initialise_sb(sb);
f7b422b1
DH		 1987}
1988
275a5d24
TM		 1989static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1990{
1991 const struct nfs_server *a = s->s_fs_info;
1992 const struct rpc_clnt *clnt_a = a->client;
1993 const struct rpc_clnt *clnt_b = b->client;
1994
1995 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1996 goto Ebusy;
1997 if (a->nfs_client != b->nfs_client)
1998 goto Ebusy;
1999 if (a->flags != b->flags)
2000 goto Ebusy;
2001 if (a->wsize != b->wsize)
2002 goto Ebusy;
2003 if (a->rsize != b->rsize)
2004 goto Ebusy;
2005 if (a->acregmin != b->acregmin)
2006 goto Ebusy;
2007 if (a->acregmax != b->acregmax)
2008 goto Ebusy;
2009 if (a->acdirmin != b->acdirmin)
2010 goto Ebusy;
2011 if (a->acdirmax != b->acdirmax)
2012 goto Ebusy;
2013 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2014 goto Ebusy;
e89a5a43 2015 return 1;
275a5d24 2016Ebusy:
e89a5a43
TM		 2017 return 0;
2018}
2019
2020struct nfs_sb_mountdata {
2021 struct nfs_server *server;
2022 int mntflags;
2023};
2024
2025static int nfs_set_super(struct super_block *s, void *data)
2026{
2027 struct nfs_sb_mountdata *sb_mntdata = data;
2028 struct nfs_server *server = sb_mntdata->server;
2029 int ret;
2030
2031 s->s_flags = sb_mntdata->mntflags;
2032 s->s_fs_info = server;
2033 ret = set_anon_super(s, server);
2034 if (ret == 0)
2035 server->s_dev = s->s_dev;
2036 return ret;
2037}
2038
fd00a8ff
CL		 2039static int nfs_compare_super_address(struct nfs_server *server1,
2040 struct nfs_server *server2)
2041{
2042 struct sockaddr *sap1, *sap2;
2043
2044 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2045 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2046
2047 if (sap1->sa_family != sap2->sa_family)
2048 return 0;
2049
2050 switch (sap1->sa_family) {
2051 case AF_INET: {
2052 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2053 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2054 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2055 return 0;
2056 if (sin1->sin_port != sin2->sin_port)
2057 return 0;
2058 break;
2059 }
2060 case AF_INET6: {
2061 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2062 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2063 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2064 return 0;
2065 if (sin1->sin6_port != sin2->sin6_port)
2066 return 0;
2067 break;
2068 }
2069 default:
2070 return 0;
2071 }
2072
2073 return 1;
2074}
2075
e89a5a43
TM		 2076static int nfs_compare_super(struct super_block *sb, void *data)
2077{
2078 struct nfs_sb_mountdata *sb_mntdata = data;
2079 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2080 int mntflags = sb_mntdata->mntflags;
2081
fd00a8ff 2082 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2083 return 0;
2084 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2085 if (old->flags & NFS_MOUNT_UNSHARED)
2086 return 0;
2087 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2088 return 0;
2089 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2090}
2091
fa799759
MS		 2092static int nfs_bdi_register(struct nfs_server *server)
2093{
2094 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2095}
2096
816724e6
TM		 2097static int nfs_get_sb(struct file_system_type *fs_type,
2098 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2099{
f7b422b1
DH		 2100 struct nfs_server *server = NULL;
2101 struct super_block *s;
33852a1f
TM		 2102 struct nfs_parsed_mount_data *data;
2103 struct nfs_fh *mntfh;
54ceac45 2104 struct dentry *mntroot;
75180df2 2105 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2106 struct nfs_sb_mountdata sb_mntdata = {
2107 .mntflags = flags,
2108 };
33852a1f
TM		 2109 int error = -ENOMEM;
2110
2111 data = kzalloc(sizeof(*data), GFP_KERNEL);
2112 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2113 if (data == NULL || mntfh == NULL)
2114 goto out_free_fh;
f7b422b1 2115
33852a1f 2116 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2117
54ceac45 2118 /* Validate the mount data */
33852a1f 2119 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2120 if (error < 0)
0655960f 2121 goto out;
f7b422b1 2122
54ceac45 2123 /* Get a volume representation */
33852a1f 2124 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2125 if (IS_ERR(server)) {
2126 error = PTR_ERR(server);
0655960f 2127 goto out;
f7b422b1 2128 }
e89a5a43 2129 sb_mntdata.server = server;
f7b422b1 2130
75180df2
TM		 2131 if (server->flags & NFS_MOUNT_UNSHARED)
2132 compare_super = NULL;
2133
54ceac45 2134 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2135 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2136 if (IS_ERR(s)) {
2137 error = PTR_ERR(s);
54ceac45 2138 goto out_err_nosb;
816724e6
TM		 2139 }
2140
54ceac45
DH		 2141 if (s->s_fs_info != server) {
2142 nfs_free_server(server);
2143 server = NULL;
fa799759
MS		 2144 } else {
2145 error = nfs_bdi_register(server);
2146 if (error)
2147 goto error_splat_super;
54ceac45 2148 }
f7b422b1 2149
54ceac45
DH		 2150 if (!s->s_root) {
2151 /* initial superblock/root creation */
33852a1f 2152 nfs_fill_super(s, data);
08734048 2153 nfs_fscache_get_super_cookie(s, data);
54ceac45 2154 }
f7b422b1 2155
33852a1f 2156 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2157 if (IS_ERR(mntroot)) {
2158 error = PTR_ERR(mntroot);
2159 goto error_splat_super;
f7b422b1 2160 }
816724e6 2161
33852a1f 2162 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2163 if (error)
2164 goto error_splat_root;
2165
54ceac45
DH		 2166 s->s_flags |= MS_ACTIVE;
2167 mnt->mnt_sb = s;
2168 mnt->mnt_root = mntroot;
0655960f
CL		 2169 error = 0;
2170
2171out:
33852a1f
TM		 2172 kfree(data->nfs_server.hostname);
2173 kfree(data->mount_server.hostname);
08734048 2174 kfree(data->fscache_uniq);
33852a1f
TM		 2175 security_free_mnt_opts(&data->lsm_opts);
2176out_free_fh:
2177 kfree(mntfh);
2178 kfree(data);
0655960f 2179 return error;
816724e6 2180
54ceac45
DH		 2181out_err_nosb:
2182 nfs_free_server(server);
0655960f 2183 goto out;
54ceac45 2184
f9c3a380
EP		 2185error_splat_root:
2186 dput(mntroot);
54ceac45 2187error_splat_super:
6f5bbff9 2188 deactivate_locked_super(s);
0655960f 2189 goto out;
f7b422b1
DH		 2190}
2191
54ceac45
DH		 2192/*
2193 * Destroy an NFS2/3 superblock
2194 */
f7b422b1
DH		 2195static void nfs_kill_super(struct super_block *s)
2196{
2197 struct nfs_server *server = NFS_SB(s);
2198
fa799759 2199 bdi_unregister(&server->backing_dev_info);
f7b422b1 2200 kill_anon_super(s);
08734048 2201 nfs_fscache_release_super_cookie(s);
54ceac45 2202 nfs_free_server(server);
f7b422b1
DH		 2203}
2204
54ceac45
DH		 2205/*
2206 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2207 */
2208static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2209 const char *dev_name, void *raw_data,
2210 struct vfsmount *mnt)
f7b422b1
DH		 2211{
2212 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2213 struct super_block *s;
2214 struct nfs_server *server;
2215 struct dentry *mntroot;
75180df2 2216 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2217 struct nfs_sb_mountdata sb_mntdata = {
2218 .mntflags = flags,
2219 };
54ceac45 2220 int error;
f7b422b1 2221
54ceac45 2222 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2223
54ceac45
DH		 2224 /* create a new volume representation */
2225 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2226 if (IS_ERR(server)) {
2227 error = PTR_ERR(server);
2228 goto out_err_noserver;
2229 }
e89a5a43 2230 sb_mntdata.server = server;
8fa5c000 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(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2237 if (IS_ERR(s)) {
2238 error = PTR_ERR(s);
2239 goto out_err_nosb;
2240 }
5006a76c 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)
2248 goto error_splat_super;
f7b422b1 2249 }
24c8dbbb 2250
54ceac45
DH		 2251 if (!s->s_root) {
2252 /* initial superblock/root creation */
54ceac45
DH		 2253 nfs_clone_super(s, data->sb);
2254 }
f7b422b1 2255
54ceac45
DH		 2256 mntroot = nfs_get_root(s, data->fh);
2257 if (IS_ERR(mntroot)) {
2258 error = PTR_ERR(mntroot);
2259 goto error_splat_super;
f7b422b1 2260 }
e9cc6c23 2261 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2262 dput(mntroot);
2263 error = -ESTALE;
2264 goto error_splat_super;
2265 }
f7b422b1 2266
54ceac45
DH		 2267 s->s_flags |= MS_ACTIVE;
2268 mnt->mnt_sb = s;
2269 mnt->mnt_root = mntroot;
f7b422b1 2270
f9c3a380
EP		 2271 /* clone any lsm security options from the parent to the new sb */
2272 security_sb_clone_mnt_opts(data->sb, s);
2273
54ceac45
DH		 2274 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2275 return 0;
24c8dbbb 2276
54ceac45
DH		 2277out_err_nosb:
2278 nfs_free_server(server);
2279out_err_noserver:
2280 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2281 return error;
f7b422b1 2282
54ceac45 2283error_splat_super:
6f5bbff9 2284 deactivate_locked_super(s);
54ceac45
DH		 2285 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2286 return error;
f7b422b1
DH		 2287}
2288
54ceac45
DH		 2289#ifdef CONFIG_NFS_V4
2290
f7b422b1 2291/*
54ceac45 2292 * Finish setting up a cloned NFS4 superblock
f7b422b1 2293 */
54ceac45
DH		 2294static void nfs4_clone_super(struct super_block *sb,
2295 const struct super_block *old_sb)
f7b422b1 2296{
54ceac45
DH		 2297 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2298 sb->s_blocksize = old_sb->s_blocksize;
2299 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2300 sb->s_time_gran = 1;
54ceac45
DH		 2301 sb->s_op = old_sb->s_op;
2302 nfs_initialise_sb(sb);
f7b422b1
DH		 2303}
2304
54ceac45
DH		 2305/*
2306 * Set up an NFS4 superblock
2307 */
2308static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2309{
54ceac45
DH		 2310 sb->s_time_gran = 1;
2311 sb->s_op = &nfs4_sops;
2312 nfs_initialise_sb(sb);
f7b422b1
DH		 2313}
2314
01c3f052
TM		 2315static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2316{
2317 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2318}
2319
f0768ebd
CL		 2320/*
2321 * Validate NFSv4 mount options
2322 */
91ea40b9
TT		 2323static int nfs4_validate_mount_data(void *options,
2324 struct nfs_parsed_mount_data *args,
2325 const char *dev_name)
f0768ebd 2326{
4c568017 2327 struct sockaddr_in *ap;
91ea40b9 2328 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2329 char *c;
2330
2331 if (data == NULL)
2332 goto out_no_data;
2333
91ea40b9
TT		 2334 args->rsize = NFS_MAX_FILE_IO_SIZE;
2335 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2336 args->acregmin = NFS_DEF_ACREGMIN;
2337 args->acregmax = NFS_DEF_ACREGMAX;
2338 args->acdirmin = NFS_DEF_ACDIRMIN;
2339 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 2340 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
6738b251
CL		 2341 args->auth_flavors[0] = RPC_AUTH_UNIX;
2342 args->auth_flavor_len = 0;
3fd5be9e 2343 args->minorversion = 0;
91ea40b9 2344
f0768ebd
CL		 2345 switch (data->version) {
2346 case 1:
4c568017
CL		 2347 ap = (struct sockaddr_in *)&args->nfs_server.address;
2348 if (data->host_addrlen > sizeof(args->nfs_server.address))
2349 goto out_no_address;
2350 if (data->host_addrlen == 0)
f0768ebd 2351 goto out_no_address;
4c568017
CL		 2352 args->nfs_server.addrlen = data->host_addrlen;
2353 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
f0768ebd 2354 return -EFAULT;
91ea40b9
TT		 2355 if (!nfs_verify_server_address((struct sockaddr *)
2356 &args->nfs_server.address))
f0768ebd
CL		 2357 goto out_no_address;
2358
6738b251
CL		 2359 if (data->auth_flavourlen) {
2360 if (data->auth_flavourlen > 1)
2361 goto out_inval_auth;
20c71f5e 2362 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2363 data->auth_flavours,
20c71f5e 2364 sizeof(args->auth_flavors[0])))
f0768ebd 2365 return -EFAULT;
f0768ebd
CL		 2366 }
2367
2368 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2369 if (IS_ERR(c))
2370 return PTR_ERR(c);
91ea40b9 2371 args->nfs_server.hostname = c;
f0768ebd
CL		 2372
2373 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2374 if (IS_ERR(c))
2375 return PTR_ERR(c);
91ea40b9
TT		 2376 args->nfs_server.export_path = c;
2377 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2378
2379 c = strndup_user(data->client_addr.data, 16);
2380 if (IS_ERR(c))
2381 return PTR_ERR(c);
91ea40b9
TT		 2382 args->client_address = c;
2383
2384 /*
2385 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2386 * can deal with.
2387 */
2388
2389 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2390 args->rsize = data->rsize;
2391 args->wsize = data->wsize;
2392 args->timeo = data->timeo;
2393 args->retrans = data->retrans;
2394 args->acregmin = data->acregmin;
2395 args->acregmax = data->acregmax;
2396 args->acdirmin = data->acdirmin;
2397 args->acdirmax = data->acdirmax;
2398 args->nfs_server.protocol = data->proto;
259875ef 2399 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2400
2401 break;
80071225 2402 default: {
dc045898 2403 int status;
91ea40b9
TT		 2404
2405 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2406 return -EINVAL;
2407
2408 if (!nfs_verify_server_address((struct sockaddr *)
91ea40b9 2409 &args->nfs_server.address))
80071225 2410 return -EINVAL;
80071225 2411
ed596a8a
CL		 2412 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2413 args->nfs_server.port);
2414
259875ef
TM		 2415 nfs_validate_transport_protocol(args);
2416
01c3f052
TM		 2417 nfs4_validate_mount_flags(args);
2418
6738b251 2419 if (args->auth_flavor_len > 1)
80071225 2420 goto out_inval_auth;
80071225 2421
91ea40b9 2422 if (args->client_address == NULL)
0a87cf12
JL		 2423 goto out_no_client_address;
2424
dc045898
CL		 2425 status = nfs_parse_devname(dev_name,
2426 &args->nfs_server.hostname,
2427 NFS4_MAXNAMLEN,
2428 &args->nfs_server.export_path,
2429 NFS4_MAXPATHLEN);
2430 if (status < 0)
2431 return status;
2432
80071225
CL		 2433 break;
2434 }
f0768ebd
CL		 2435 }
2436
2437 return 0;
2438
2439out_no_data:
2440 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2441 return -EINVAL;
2442
2443out_inval_auth:
2444 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2445 data->auth_flavourlen);
2446 return -EINVAL;
2447
2448out_no_address:
2449 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2450 return -EINVAL;
0a87cf12
JL		 2451
2452out_no_client_address:
2453 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2454 return -EINVAL;
f0768ebd
CL		 2455}
2456
54ceac45 2457/*
c02d7adf 2458 * Get the superblock for the NFS4 root partition
54ceac45 2459 */
c02d7adf 2460static int nfs4_remote_get_sb(struct file_system_type *fs_type,
816724e6 2461 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2462{
c02d7adf 2463 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2464 struct super_block *s;
2465 struct nfs_server *server;
33852a1f 2466 struct nfs_fh *mntfh;
54ceac45 2467 struct dentry *mntroot;
75180df2 2468 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2469 struct nfs_sb_mountdata sb_mntdata = {
2470 .mntflags = flags,
2471 };
33852a1f
TM		 2472 int error = -ENOMEM;
2473
33852a1f
TM		 2474 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2475 if (data == NULL || mntfh == NULL)
2476 goto out_free_fh;
f7b422b1 2477
33852a1f 2478 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2479
54ceac45 2480 /* Get a volume representation */
33852a1f 2481 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2482 if (IS_ERR(server)) {
2483 error = PTR_ERR(server);
29eb981a 2484 goto out;
f7b422b1 2485 }
e89a5a43 2486 sb_mntdata.server = server;
f7b422b1 2487
75180df2
TM		 2488 if (server->flags & NFS4_MOUNT_UNSHARED)
2489 compare_super = NULL;
2490
54ceac45 2491 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2492 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2493 if (IS_ERR(s)) {
2494 error = PTR_ERR(s);
f7b422b1 2495 goto out_free;
816724e6
TM		 2496 }
2497
5dd3177a
TM		 2498 if (s->s_fs_info != server) {
2499 nfs_free_server(server);
2500 server = NULL;
fa799759
MS		 2501 } else {
2502 error = nfs_bdi_register(server);
2503 if (error)
2504 goto error_splat_super;
5dd3177a
TM		 2505 }
2506
54ceac45
DH		 2507 if (!s->s_root) {
2508 /* initial superblock/root creation */
54ceac45 2509 nfs4_fill_super(s);
08734048 2510 nfs_fscache_get_super_cookie(s, data);
54ceac45 2511 }
f7b422b1 2512
33852a1f 2513 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2514 if (IS_ERR(mntroot)) {
2515 error = PTR_ERR(mntroot);
2516 goto error_splat_super;
f7b422b1 2517 }
54ceac45 2518
33852a1f 2519 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2520 if (error)
2521 goto error_splat_root;
2522
f7b422b1 2523 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2524 mnt->mnt_sb = s;
2525 mnt->mnt_root = mntroot;
29eb981a
CL		 2526 error = 0;
2527
2528out:
33852a1f
TM		 2529 security_free_mnt_opts(&data->lsm_opts);
2530out_free_fh:
2531 kfree(mntfh);
29eb981a 2532 return error;
54ceac45 2533
f7b422b1 2534out_free:
54ceac45 2535 nfs_free_server(server);
29eb981a 2536 goto out;
54ceac45 2537
46c8ac74
EP		 2538error_splat_root:
2539 dput(mntroot);
54ceac45 2540error_splat_super:
6f5bbff9 2541 deactivate_locked_super(s);
29eb981a 2542 goto out;
f7b422b1
DH		 2543}
2544
c02d7adf
TM		 2545static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2546 int flags, void *data, const char *hostname)
2547{
2548 struct vfsmount *root_mnt;
2549 char *root_devname;
2550 size_t len;
2551
2552 len = strlen(hostname) + 3;
2553 root_devname = kmalloc(len, GFP_KERNEL);
2554 if (root_devname == NULL)
2555 return ERR_PTR(-ENOMEM);
2556 snprintf(root_devname, len, "%s:/", hostname);
2557 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2558 kfree(root_devname);
2559 return root_mnt;
2560}
2561
b88f8a54
TM		 2562static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2563{
2564 char *page = (char *) __get_free_page(GFP_KERNEL);
2565 char *devname, *tmp;
2566
2567 if (page == NULL)
2568 return;
2569 devname = nfs_path(path->mnt->mnt_devname,
2570 path->mnt->mnt_root, path->dentry,
2571 page, PAGE_SIZE);
2572 if (devname == NULL)
2573 goto out_freepage;
2574 tmp = kstrdup(devname, GFP_KERNEL);
2575 if (tmp == NULL)
2576 goto out_freepage;
2577 kfree(mnt->mnt_devname);
2578 mnt->mnt_devname = tmp;
2579out_freepage:
2580 free_page((unsigned long)page);
2581}
2582
c02d7adf
TM		 2583static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2584 const char *export_path, struct vfsmount *mnt_target)
2585{
2586 struct mnt_namespace *ns_private;
2587 struct nameidata nd;
2588 struct super_block *s;
2589 int ret;
2590
2591 ns_private = create_mnt_ns(root_mnt);
2592 ret = PTR_ERR(ns_private);
2593 if (IS_ERR(ns_private))
2594 goto out_mntput;
2595
2596 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2597 export_path, LOOKUP_FOLLOW, &nd);
2598
2599 put_mnt_ns(ns_private);
2600
2601 if (ret != 0)
2602 goto out_err;
2603
2604 s = nd.path.mnt->mnt_sb;
2605 atomic_inc(&s->s_active);
2606 mnt_target->mnt_sb = s;
2607 mnt_target->mnt_root = dget(nd.path.dentry);
2608
b88f8a54
TM		 2609 /* Correct the device pathname */
2610 nfs_fix_devname(&nd.path, mnt_target);
2611
c02d7adf
TM		 2612 path_put(&nd.path);
2613 down_write(&s->s_umount);
2614 return 0;
2615out_mntput:
2616 mntput(root_mnt);
2617out_err:
2618 return ret;
2619}
2620
2621/*
2622 * Get the superblock for an NFS4 mountpoint
2623 */
2624static int nfs4_get_sb(struct file_system_type *fs_type,
2625 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2626{
2627 struct nfs_parsed_mount_data *data;
2628 char *export_path;
2629 struct vfsmount *root_mnt;
2630 int error = -ENOMEM;
2631
2632 data = kzalloc(sizeof(*data), GFP_KERNEL);
2633 if (data == NULL)
2634 goto out_free_data;
2635
2636 /* Validate the mount data */
2637 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2638 if (error < 0)
2639 goto out;
2640
2641 export_path = data->nfs_server.export_path;
2642 data->nfs_server.export_path = "/";
2643 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2644 data->nfs_server.hostname);
2645 data->nfs_server.export_path = export_path;
2646
2647 error = PTR_ERR(root_mnt);
2648 if (IS_ERR(root_mnt))
2649 goto out;
2650
2651 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2652
2653out:
2654 kfree(data->client_address);
2655 kfree(data->nfs_server.export_path);
2656 kfree(data->nfs_server.hostname);
2657 kfree(data->fscache_uniq);
2658out_free_data:
2659 kfree(data);
2660 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2661 error != 0 ? " [error]" : "");
2662 return error;
2663}
2664
f7b422b1
DH		 2665static void nfs4_kill_super(struct super_block *sb)
2666{
2667 struct nfs_server *server = NFS_SB(sb);
2668
0f3e66c6 2669 dprintk("--> %s\n", __func__);
515d8611 2670 nfs_super_return_all_delegations(sb);
f7b422b1 2671 kill_anon_super(sb);
f7b422b1 2672 nfs4_renewd_prepare_shutdown(server);
08734048 2673 nfs_fscache_release_super_cookie(sb);
54ceac45 2674 nfs_free_server(server);
0f3e66c6 2675 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2676}
2677
2678/*
54ceac45 2679 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2680 */
54ceac45
DH		 2681static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2682 const char *dev_name, void *raw_data,
2683 struct vfsmount *mnt)
f7b422b1 2684{
54ceac45
DH		 2685 struct nfs_clone_mount *data = raw_data;
2686 struct super_block *s;
2687 struct nfs_server *server;
2688 struct dentry *mntroot;
75180df2 2689 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2690 struct nfs_sb_mountdata sb_mntdata = {
2691 .mntflags = flags,
2692 };
54ceac45 2693 int error;
f7b422b1 2694
54ceac45 2695 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2696
54ceac45
DH		 2697 /* create a new volume representation */
2698 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2699 if (IS_ERR(server)) {
2700 error = PTR_ERR(server);
2701 goto out_err_noserver;
f7b422b1 2702 }
e89a5a43 2703 sb_mntdata.server = server;
f7b422b1 2704
75180df2
TM		 2705 if (server->flags & NFS4_MOUNT_UNSHARED)
2706 compare_super = NULL;
2707
54ceac45 2708 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2709 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2710 if (IS_ERR(s)) {
2711 error = PTR_ERR(s);
2712 goto out_err_nosb;
f7b422b1 2713 }
f7b422b1 2714
54ceac45
DH		 2715 if (s->s_fs_info != server) {
2716 nfs_free_server(server);
2717 server = NULL;
fa799759
MS		 2718 } else {
2719 error = nfs_bdi_register(server);
2720 if (error)
2721 goto error_splat_super;
54ceac45 2722 }
f7b422b1 2723
54ceac45
DH		 2724 if (!s->s_root) {
2725 /* initial superblock/root creation */
54ceac45
DH		 2726 nfs4_clone_super(s, data->sb);
2727 }
f7b422b1 2728
54ceac45
DH		 2729 mntroot = nfs4_get_root(s, data->fh);
2730 if (IS_ERR(mntroot)) {
2731 error = PTR_ERR(mntroot);
2732 goto error_splat_super;
2733 }
e9cc6c23
TM		 2734 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2735 dput(mntroot);
2736 error = -ESTALE;
2737 goto error_splat_super;
2738 }
f7b422b1 2739
54ceac45
DH		 2740 s->s_flags |= MS_ACTIVE;
2741 mnt->mnt_sb = s;
2742 mnt->mnt_root = mntroot;
2743
46c8ac74
EP		 2744 security_sb_clone_mnt_opts(data->sb, s);
2745
54ceac45
DH		 2746 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2747 return 0;
2748
2749out_err_nosb:
2750 nfs_free_server(server);
2751out_err_noserver:
2752 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2753 return error;
2754
2755error_splat_super:
6f5bbff9 2756 deactivate_locked_super(s);
54ceac45
DH		 2757 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2758 return error;
f7b422b1
DH		 2759}
2760
c02d7adf
TM		 2761static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2762 int flags, const char *dev_name, void *raw_data,
2763 struct vfsmount *mnt)
f7b422b1
DH		 2764{
2765 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2766 struct super_block *s;
2767 struct nfs_server *server;
2768 struct dentry *mntroot;
2769 struct nfs_fh mntfh;
75180df2 2770 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2771 struct nfs_sb_mountdata sb_mntdata = {
2772 .mntflags = flags,
2773 };
54ceac45
DH		 2774 int error;
2775
2776 dprintk("--> nfs4_referral_get_sb()\n");
2777
2778 /* create a new volume representation */
2779 server = nfs4_create_referral_server(data, &mntfh);
2780 if (IS_ERR(server)) {
2781 error = PTR_ERR(server);
2782 goto out_err_noserver;
2783 }
e89a5a43 2784 sb_mntdata.server = server;
54ceac45 2785
75180df2
TM		 2786 if (server->flags & NFS4_MOUNT_UNSHARED)
2787 compare_super = NULL;
2788
54ceac45 2789 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2790 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2791 if (IS_ERR(s)) {
2792 error = PTR_ERR(s);
2793 goto out_err_nosb;
2794 }
2795
2796 if (s->s_fs_info != server) {
2797 nfs_free_server(server);
2798 server = NULL;
fa799759
MS		 2799 } else {
2800 error = nfs_bdi_register(server);
2801 if (error)
2802 goto error_splat_super;
54ceac45
DH		 2803 }
2804
2805 if (!s->s_root) {
2806 /* initial superblock/root creation */
54ceac45
DH		 2807 nfs4_fill_super(s);
2808 }
2809
f2d0d85e 2810 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2811 if (IS_ERR(mntroot)) {
2812 error = PTR_ERR(mntroot);
2813 goto error_splat_super;
2814 }
e9cc6c23
TM		 2815 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2816 dput(mntroot);
2817 error = -ESTALE;
2818 goto error_splat_super;
2819 }
54ceac45
DH		 2820
2821 s->s_flags |= MS_ACTIVE;
2822 mnt->mnt_sb = s;
2823 mnt->mnt_root = mntroot;
2824
46c8ac74
EP		 2825 security_sb_clone_mnt_opts(data->sb, s);
2826
54ceac45
DH		 2827 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2828 return 0;
2829
2830out_err_nosb:
2831 nfs_free_server(server);
2832out_err_noserver:
2833 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2834 return error;
2835
2836error_splat_super:
6f5bbff9 2837 deactivate_locked_super(s);
54ceac45
DH		 2838 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2839 return error;
f7b422b1
DH		 2840}
2841
c02d7adf
TM		 2842/*
2843 * Create an NFS4 server record on referral traversal
2844 */
2845static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2846 int flags, const char *dev_name, void *raw_data,
2847 struct vfsmount *mnt)
2848{
2849 struct nfs_clone_mount *data = raw_data;
2850 char *export_path;
2851 struct vfsmount *root_mnt;
2852 int error;
2853
2854 dprintk("--> nfs4_referral_get_sb()\n");
2855
2856 export_path = data->mnt_path;
2857 data->mnt_path = "/";
2858
2859 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2860 flags, data, data->hostname);
2861 data->mnt_path = export_path;
2862
2863 error = PTR_ERR(root_mnt);
2864 if (IS_ERR(root_mnt))
2865 goto out;
2866
2867 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2868out:
2869 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2870 error != 0 ? " [error]" : "");
2871 return error;
2872}
2873
54ceac45 2874#endif /* CONFIG_NFS_V4 */
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