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[mirror_ubuntu-bionic-kernel.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
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,
764302cc 76 Opt_v2, Opt_v3, Opt_v4,
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" },
764302cc 130 { Opt_v4, "v4" },
bf0fd768
CL		 131 { Opt_udp, "udp" },
132 { Opt_tcp, "tcp" },
2cf7ff7a 133 { Opt_rdma, "rdma" },
bf0fd768
CL		 134 { Opt_acl, "acl" },
135 { Opt_noacl, "noacl" },
136 { Opt_rdirplus, "rdirplus" },
137 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 138 { Opt_sharecache, "sharecache" },
139 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 140 { Opt_resvport, "resvport" },
141 { Opt_noresvport, "noresvport" },
b797cac7
DH		 142 { Opt_fscache, "fsc" },
143 { Opt_fscache_uniq, "fsc=%s" },
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
TM		 172 { Opt_lookupcache, "lookupcache=%s" },
173
bf0fd768
CL		 174 { Opt_err, NULL }
175};
176
177enum {
2cf7ff7a 178 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 179
180 Opt_xprt_err
181};
182
a447c093 183static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768
CL		 184 { Opt_xprt_udp, "udp" },
185 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 186 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 187
188 { Opt_xprt_err, NULL }
189};
190
191enum {
192 Opt_sec_none, Opt_sec_sys,
193 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
194 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
195 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
196
197 Opt_sec_err
198};
199
a447c093 200static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 201 { Opt_sec_none, "none" },
202 { Opt_sec_none, "null" },
203 { Opt_sec_sys, "sys" },
204
205 { Opt_sec_krb5, "krb5" },
206 { Opt_sec_krb5i, "krb5i" },
207 { Opt_sec_krb5p, "krb5p" },
208
209 { Opt_sec_lkey, "lkey" },
210 { Opt_sec_lkeyi, "lkeyi" },
211 { Opt_sec_lkeyp, "lkeyp" },
212
8d042218
OK		 213 { Opt_sec_spkm, "spkm3" },
214 { Opt_sec_spkmi, "spkm3i" },
215 { Opt_sec_spkmp, "spkm3p" },
216
bf0fd768
CL		 217 { Opt_sec_err, NULL }
218};
219
7973c1f1
TM		 220enum {
221 Opt_lookupcache_all, Opt_lookupcache_positive,
222 Opt_lookupcache_none,
223
224 Opt_lookupcache_err
225};
226
227static match_table_t nfs_lookupcache_tokens = {
228 { Opt_lookupcache_all, "all" },
229 { Opt_lookupcache_positive, "pos" },
230 { Opt_lookupcache_positive, "positive" },
231 { Opt_lookupcache_none, "none" },
232
233 { Opt_lookupcache_err, NULL }
234};
235
bf0fd768 236
42faad99 237static void nfs_umount_begin(struct super_block *);
816724e6 238static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 239static int nfs_show_options(struct seq_file *, struct vfsmount *);
240static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 241static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 242static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1 244static void nfs_kill_super(struct super_block *);
48b605f8 245static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 246
247static struct file_system_type nfs_fs_type = {
248 .owner = THIS_MODULE,
249 .name = "nfs",
250 .get_sb = nfs_get_sb,
251 .kill_sb = nfs_kill_super,
349457cc 252 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 253};
254
54ceac45 255struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 256 .owner = THIS_MODULE,
257 .name = "nfs",
54ceac45 258 .get_sb = nfs_xdev_get_sb,
f7b422b1 259 .kill_sb = nfs_kill_super,
349457cc 260 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 261};
262
ee9b6d61 263static const struct super_operations nfs_sops = {
f7b422b1
DH		 264 .alloc_inode = nfs_alloc_inode,
265 .destroy_inode = nfs_destroy_inode,
266 .write_inode = nfs_write_inode,
267 .statfs = nfs_statfs,
268 .clear_inode = nfs_clear_inode,
269 .umount_begin = nfs_umount_begin,
270 .show_options = nfs_show_options,
271 .show_stats = nfs_show_stats,
48b605f8 272 .remount_fs = nfs_remount,
f7b422b1
DH		 273};
274
275#ifdef CONFIG_NFS_V4
7630c852
CL		 276static int nfs4_validate_text_mount_data(void *options,
277 struct nfs_parsed_mount_data *args, const char *dev_name);
a6fe23be
CL		 278static int nfs4_try_mount(int flags, const char *dev_name,
279 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
816724e6
TM		 280static int nfs4_get_sb(struct file_system_type *fs_type,
281 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 282static int nfs4_remote_get_sb(struct file_system_type *fs_type,
283 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 284static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
285 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
286static int nfs4_referral_get_sb(struct file_system_type *fs_type,
287 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 288static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 290static void nfs4_kill_super(struct super_block *sb);
291
292static struct file_system_type nfs4_fs_type = {
293 .owner = THIS_MODULE,
294 .name = "nfs4",
295 .get_sb = nfs4_get_sb,
296 .kill_sb = nfs4_kill_super,
349457cc 297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 298};
299
c02d7adf
TM		 300static struct file_system_type nfs4_remote_fs_type = {
301 .owner = THIS_MODULE,
302 .name = "nfs4",
303 .get_sb = nfs4_remote_get_sb,
304 .kill_sb = nfs4_kill_super,
305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
306};
307
54ceac45 308struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 309 .owner = THIS_MODULE,
310 .name = "nfs4",
54ceac45 311 .get_sb = nfs4_xdev_get_sb,
f7b422b1 312 .kill_sb = nfs4_kill_super,
349457cc 313 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 314};
315
c02d7adf
TM		 316static struct file_system_type nfs4_remote_referral_fs_type = {
317 .owner = THIS_MODULE,
318 .name = "nfs4",
319 .get_sb = nfs4_remote_referral_get_sb,
320 .kill_sb = nfs4_kill_super,
321 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
322};
323
54ceac45 324struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 325 .owner = THIS_MODULE,
326 .name = "nfs4",
54ceac45 327 .get_sb = nfs4_referral_get_sb,
f7b422b1 328 .kill_sb = nfs4_kill_super,
349457cc 329 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 330};
331
ee9b6d61 332static const struct super_operations nfs4_sops = {
f7b422b1
DH		 333 .alloc_inode = nfs_alloc_inode,
334 .destroy_inode = nfs_destroy_inode,
335 .write_inode = nfs_write_inode,
336 .statfs = nfs_statfs,
337 .clear_inode = nfs4_clear_inode,
338 .umount_begin = nfs_umount_begin,
339 .show_options = nfs_show_options,
340 .show_stats = nfs_show_stats,
48b605f8 341 .remount_fs = nfs_remount,
f7b422b1
DH		 342};
343#endif
344
8e1f936b
RR		 345static struct shrinker acl_shrinker = {
346 .shrink = nfs_access_cache_shrinker,
347 .seeks = DEFAULT_SEEKS,
348};
979df72e 349
f7b422b1
DH		 350/*
351 * Register the NFS filesystems
352 */
353int __init register_nfs_fs(void)
354{
355 int ret;
356
357 ret = register_filesystem(&nfs_fs_type);
358 if (ret < 0)
359 goto error_0;
360
f7b422b1
DH		 361 ret = nfs_register_sysctl();
362 if (ret < 0)
363 goto error_1;
89a09141 364#ifdef CONFIG_NFS_V4
f7b422b1
DH		 365 ret = register_filesystem(&nfs4_fs_type);
366 if (ret < 0)
367 goto error_2;
368#endif
8e1f936b 369 register_shrinker(&acl_shrinker);
f7b422b1
DH		 370 return 0;
371
372#ifdef CONFIG_NFS_V4
373error_2:
374 nfs_unregister_sysctl();
89a09141 375#endif
f7b422b1
DH		 376error_1:
377 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 378error_0:
379 return ret;
380}
381
382/*
383 * Unregister the NFS filesystems
384 */
385void __exit unregister_nfs_fs(void)
386{
8e1f936b 387 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 388#ifdef CONFIG_NFS_V4
389 unregister_filesystem(&nfs4_fs_type);
f7b422b1 390#endif
49af7ee1 391 nfs_unregister_sysctl();
f7b422b1
DH		 392 unregister_filesystem(&nfs_fs_type);
393}
394
1daef0a8 395void nfs_sb_active(struct super_block *sb)
ef818a28 396{
1daef0a8 397 struct nfs_server *server = NFS_SB(sb);
ef818a28 398
1daef0a8
TM		 399 if (atomic_inc_return(&server->active) == 1)
400 atomic_inc(&sb->s_active);
ef818a28
SD		 401}
402
1daef0a8 403void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 404{
405 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 406
407 if (atomic_dec_and_test(&server->active))
408 deactivate_super(sb);
ef818a28
SD		 409}
410
f7b422b1
DH		 411/*
412 * Deliver file system statistics to userspace
413 */
816724e6 414static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 415{
0c7d90cf 416 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 417 unsigned char blockbits;
418 unsigned long blockres;
0c7d90cf 419 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 420 struct nfs_fattr fattr;
421 struct nfs_fsstat res = {
422 .fattr = &fattr,
423 };
424 int error;
425
8fa5c000 426 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 427 if (error < 0)
428 goto out_err;
1a0ba9ae 429 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 430
431 /*
432 * Current versions of glibc do not correctly handle the
433 * case where f_frsize != f_bsize. Eventually we want to
434 * report the value of wtmult in this field.
435 */
0c7d90cf 436 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 437
438 /*
439 * On most *nix systems, f_blocks, f_bfree, and f_bavail
440 * are reported in units of f_frsize. Linux hasn't had
441 * an f_frsize field in its statfs struct until recently,
442 * thus historically Linux's sys_statfs reports these
443 * fields in units of f_bsize.
444 */
0c7d90cf
DH		 445 buf->f_bsize = dentry->d_sb->s_blocksize;
446 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 447 blockres = (1 << blockbits) - 1;
448 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
449 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
450 buf->f_bavail = (res.abytes + blockres) >> blockbits;
451
452 buf->f_files = res.tfiles;
453 buf->f_ffree = res.afiles;
454
455 buf->f_namelen = server->namelen;
1a0ba9ae 456
f7b422b1
DH		 457 return 0;
458
459 out_err:
3110ff80 460 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 461 return error;
f7b422b1
DH		 462}
463
7d4e2747
DH		 464/*
465 * Map the security flavour number to a name
466 */
81039f1f
TM		 467static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
468{
7d4e2747 469 static const struct {
81039f1f
TM		 470 rpc_authflavor_t flavour;
471 const char *str;
472 } sec_flavours[] = {
473 { RPC_AUTH_NULL, "null" },
474 { RPC_AUTH_UNIX, "sys" },
475 { RPC_AUTH_GSS_KRB5, "krb5" },
476 { RPC_AUTH_GSS_KRB5I, "krb5i" },
477 { RPC_AUTH_GSS_KRB5P, "krb5p" },
478 { RPC_AUTH_GSS_LKEY, "lkey" },
479 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
480 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
481 { RPC_AUTH_GSS_SPKM, "spkm" },
482 { RPC_AUTH_GSS_SPKMI, "spkmi" },
483 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 484 { UINT_MAX, "unknown" }
81039f1f
TM		 485 };
486 int i;
487
4d81cd16 488 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 489 if (sec_flavours[i].flavour == flavour)
490 break;
491 }
492 return sec_flavours[i].str;
493}
494
82d101d5
CL		 495static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
496 int showdefaults)
497{
498 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
499
500 switch (sap->sa_family) {
501 case AF_INET: {
502 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 503 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 504 break;
505 }
506 case AF_INET6: {
507 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
5b095d98 508 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
82d101d5
CL		 509 break;
510 }
511 default:
512 if (showdefaults)
513 seq_printf(m, ",mountaddr=unspecified");
514 }
515
516 if (nfss->mountd_version || showdefaults)
517 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
518 if (nfss->mountd_port || showdefaults)
519 seq_printf(m, ",mountport=%u", nfss->mountd_port);
520
521 switch (nfss->mountd_protocol) {
522 case IPPROTO_UDP:
523 seq_printf(m, ",mountproto=udp");
524 break;
525 case IPPROTO_TCP:
526 seq_printf(m, ",mountproto=tcp");
527 break;
528 default:
529 if (showdefaults)
530 seq_printf(m, ",mountproto=auto");
531 }
532}
533
f7b422b1
DH		 534/*
535 * Describe the mount options in force on this server representation
536 */
82d101d5
CL		 537static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
538 int showdefaults)
f7b422b1 539{
509de811 540 static const struct proc_nfs_info {
f7b422b1 541 int flag;
509de811
DH		 542 const char *str;
543 const char *nostr;
f7b422b1
DH		 544 } nfs_info[] = {
545 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 546 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 547 { NFS_MOUNT_NOCTO, ",nocto", "" },
548 { NFS_MOUNT_NOAC, ",noac", "" },
549 { NFS_MOUNT_NONLM, ",nolock", "" },
550 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 551 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 552 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
553 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 554 { 0, NULL, NULL }
555 };
509de811 556 const struct proc_nfs_info *nfs_infop;
8fa5c000 557 struct nfs_client *clp = nfss->nfs_client;
82d101d5 558 u32 version = clp->rpc_ops->version;
f7b422b1 559
82d101d5 560 seq_printf(m, ",vers=%u", version);
2d767432
CL		 561 seq_printf(m, ",rsize=%u", nfss->rsize);
562 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 563 if (nfss->bsize != 0)
564 seq_printf(m, ",bsize=%u", nfss->bsize);
565 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 566 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 567 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 568 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 569 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 570 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 571 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 572 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 573 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 574 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
575 if (nfss->flags & nfs_infop->flag)
576 seq_puts(m, nfs_infop->str);
577 else
578 seq_puts(m, nfs_infop->nostr);
579 }
56928edd
TT		 580 seq_printf(m, ",proto=%s",
581 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 582 if (version == 4) {
583 if (nfss->port != NFS_PORT)
584 seq_printf(m, ",port=%u", nfss->port);
585 } else
586 if (nfss->port)
587 seq_printf(m, ",port=%u", nfss->port);
588
33170233
TM		 589 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
590 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 591 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 592
593 if (version != 4)
594 nfs_show_mountd_options(m, nfss, showdefaults);
595
596#ifdef CONFIG_NFS_V4
597 if (clp->rpc_ops->version == 4)
598 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
599#endif
b797cac7
DH		 600 if (nfss->options & NFS_OPTION_FSCACHE)
601 seq_printf(m, ",fsc");
f7b422b1
DH		 602}
603
604/*
605 * Describe the mount options on this VFS mountpoint
606 */
607static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
608{
609 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
610
611 nfs_show_mount_options(m, nfss, 0);
612
5d8515ca
CL		 613 seq_printf(m, ",addr=%s",
614 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
615 RPC_DISPLAY_ADDR));
f7b422b1
DH		 616
617 return 0;
618}
619
620/*
621 * Present statistical information for this VFS mountpoint
622 */
623static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
624{
625 int i, cpu;
626 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
627 struct rpc_auth *auth = nfss->client->cl_auth;
628 struct nfs_iostats totals = { };
629
630 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
631
632 /*
633 * Display all mount option settings
634 */
635 seq_printf(m, "\n\topts:\t");
636 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
637 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
638 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
639 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
640 nfs_show_mount_options(m, nfss, 1);
641
642 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
643
644 seq_printf(m, "\n\tcaps:\t");
645 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 646 seq_printf(m, ",wtmult=%u", nfss->wtmult);
647 seq_printf(m, ",dtsize=%u", nfss->dtsize);
648 seq_printf(m, ",bsize=%u", nfss->bsize);
649 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 650
651#ifdef CONFIG_NFS_V4
40c55319 652 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 653 seq_printf(m, "\n\tnfsv4:\t");
654 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
655 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
656 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
657 }
658#endif
659
660 /*
661 * Display security flavor in effect for this mount
662 */
2d767432 663 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 664 if (auth->au_flavor)
2d767432 665 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 666
667 /*
668 * Display superblock I/O counters
669 */
670 for_each_possible_cpu(cpu) {
671 struct nfs_iostats *stats;
672
673 preempt_disable();
674 stats = per_cpu_ptr(nfss->io_stats, cpu);
675
676 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
677 totals.events[i] += stats->events[i];
678 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
679 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 680#ifdef CONFIG_NFS_FSCACHE
681 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
682 totals.fscache[i] += stats->fscache[i];
683#endif
f7b422b1
DH		 684
685 preempt_enable();
686 }
687
688 seq_printf(m, "\n\tevents:\t");
689 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
690 seq_printf(m, "%lu ", totals.events[i]);
691 seq_printf(m, "\n\tbytes:\t");
692 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
693 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 694#ifdef CONFIG_NFS_FSCACHE
695 if (nfss->options & NFS_OPTION_FSCACHE) {
696 seq_printf(m, "\n\tfsc:\t");
697 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
698 seq_printf(m, "%Lu ", totals.bytes[i]);
699 }
700#endif
f7b422b1
DH		 701 seq_printf(m, "\n");
702
703 rpc_print_iostats(m, nfss->client);
704
705 return 0;
706}
707
708/*
709 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 710 * in response to xdev traversals and referrals
f7b422b1 711 */
42faad99 712static void nfs_umount_begin(struct super_block *sb)
f7b422b1 713{
67e55205 714 struct nfs_server *server;
fc6ae3cf
TM		 715 struct rpc_clnt *rpc;
716
67e55205 717 server = NFS_SB(sb);
fc6ae3cf
TM		 718 /* -EIO all pending I/O */
719 rpc = server->client_acl;
720 if (!IS_ERR(rpc))
721 rpc_killall_tasks(rpc);
722 rpc = server->client;
723 if (!IS_ERR(rpc))
724 rpc_killall_tasks(rpc);
f7b422b1
DH		 725}
726
c5811dbd 727static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 728{
729 struct nfs_parsed_mount_data *data;
730
731 data = kzalloc(sizeof(*data), GFP_KERNEL);
732 if (data) {
9423a08a
CL		 733 data->rsize = NFS_MAX_FILE_IO_SIZE;
734 data->wsize = NFS_MAX_FILE_IO_SIZE;
735 data->acregmin = NFS_DEF_ACREGMIN;
736 data->acregmax = NFS_DEF_ACREGMAX;
737 data->acdirmin = NFS_DEF_ACDIRMIN;
738 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 739 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 740 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 741 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 742 data->auth_flavors[0] = RPC_AUTH_UNIX;
743 data->auth_flavor_len = 1;
c5811dbd 744 data->version = version;
9423a08a
CL		 745 data->minorversion = 0;
746 }
747 return data;
748}
749
fc50d58f 750/*
cdcd7f9a
CL		 751 * Sanity-check a server address provided by the mount command.
752 *
753 * Address family must be initialized, and address must not be
754 * the ANY address for that family.
fc50d58f
CL		 755 */
756static int nfs_verify_server_address(struct sockaddr *addr)
757{
758 switch (addr->sa_family) {
759 case AF_INET: {
cdcd7f9a 760 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 761 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 762 }
763 case AF_INET6: {
764 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
765 return !ipv6_addr_any(sa);
fc50d58f
CL		 766 }
767 }
768
53a0b9c4 769 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 770 return 0;
771}
772
4cfd74fc
CL		 773/*
774 * Select between a default port value and a user-specified port value.
775 * If a zero value is set, then autobind will be used.
776 */
f5855fec 777static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 778 const unsigned short default_port)
779{
f5855fec
TM		 780 if (*port == NFS_UNSPEC_PORT)
781 *port = default_port;
4cfd74fc 782
f5855fec 783 rpc_set_port(sap, *port);
4cfd74fc
CL		 784}
785
259875ef
TM		 786/*
787 * Sanity check the NFS transport protocol.
788 *
789 */
790static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
791{
792 switch (mnt->nfs_server.protocol) {
793 case XPRT_TRANSPORT_UDP:
794 case XPRT_TRANSPORT_TCP:
795 case XPRT_TRANSPORT_RDMA:
796 break;
797 default:
798 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
799 }
800}
801
802/*
803 * For text based NFSv2/v3 mounts, the mount protocol transport default
804 * settings should depend upon the specified NFS transport.
805 */
806static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
807{
808 nfs_validate_transport_protocol(mnt);
809
810 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
811 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
812 return;
813 switch (mnt->nfs_server.protocol) {
814 case XPRT_TRANSPORT_UDP:
815 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
816 break;
817 case XPRT_TRANSPORT_TCP:
818 case XPRT_TRANSPORT_RDMA:
819 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
820 }
821}
822
01060c89
CL		 823/*
824 * Parse the value of the 'sec=' option.
01060c89
CL		 825 */
826static int nfs_parse_security_flavors(char *value,
827 struct nfs_parsed_mount_data *mnt)
828{
829 substring_t args[MAX_OPT_ARGS];
830
831 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
832
833 switch (match_token(value, nfs_secflavor_tokens, args)) {
834 case Opt_sec_none:
01060c89
CL		 835 mnt->auth_flavors[0] = RPC_AUTH_NULL;
836 break;
837 case Opt_sec_sys:
01060c89
CL		 838 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
839 break;
840 case Opt_sec_krb5:
01060c89
CL		 841 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
842 break;
843 case Opt_sec_krb5i:
01060c89
CL		 844 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
845 break;
846 case Opt_sec_krb5p:
01060c89
CL		 847 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
848 break;
849 case Opt_sec_lkey:
01060c89
CL		 850 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
851 break;
852 case Opt_sec_lkeyi:
01060c89
CL		 853 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
854 break;
855 case Opt_sec_lkeyp:
01060c89
CL		 856 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
857 break;
858 case Opt_sec_spkm:
01060c89
CL		 859 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
860 break;
861 case Opt_sec_spkmi:
01060c89
CL		 862 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
863 break;
864 case Opt_sec_spkmp:
01060c89
CL		 865 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
866 break;
867 default:
868 return 0;
869 }
870
059f90b3 871 mnt->auth_flavor_len = 1;
01060c89
CL		 872 return 1;
873}
874
bf0fd768
CL		 875/*
876 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 877 * a data structure. The whole mount string is processed; bad options are
878 * skipped as they are encountered. If there were no errors, return 1;
879 * otherwise return 0 (zero).
bf0fd768
CL		 880 */
881static int nfs_parse_mount_options(char *raw,
882 struct nfs_parsed_mount_data *mnt)
883{
f9c3a380 884 char *p, *string, *secdata;
d23c45fd 885 int rc, sloppy = 0, invalid_option = 0;
bf0fd768
CL		 886
887 if (!raw) {
888 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
889 return 1;
890 }
891 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
892
f9c3a380
EP		 893 secdata = alloc_secdata();
894 if (!secdata)
895 goto out_nomem;
896
897 rc = security_sb_copy_data(raw, secdata);
898 if (rc)
899 goto out_security_failure;
900
901 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
902 if (rc)
903 goto out_security_failure;
904
905 free_secdata(secdata);
906
bf0fd768
CL		 907 while ((p = strsep(&raw, ",")) != NULL) {
908 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 909 unsigned long option;
910 int token;
bf0fd768
CL		 911
912 if (!*p)
913 continue;
914
915 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
916
917 token = match_token(p, nfs_mount_option_tokens, args);
918 switch (token) {
f45663ce
CL		 919
920 /*
921 * boolean options: foo/nofoo
922 */
bf0fd768
CL		 923 case Opt_soft:
924 mnt->flags |= NFS_MOUNT_SOFT;
925 break;
926 case Opt_hard:
927 mnt->flags &= ~NFS_MOUNT_SOFT;
928 break;
bf0fd768
CL		 929 case Opt_posix:
930 mnt->flags |= NFS_MOUNT_POSIX;
931 break;
932 case Opt_noposix:
933 mnt->flags &= ~NFS_MOUNT_POSIX;
934 break;
935 case Opt_cto:
936 mnt->flags &= ~NFS_MOUNT_NOCTO;
937 break;
938 case Opt_nocto:
939 mnt->flags |= NFS_MOUNT_NOCTO;
940 break;
941 case Opt_ac:
942 mnt->flags &= ~NFS_MOUNT_NOAC;
943 break;
944 case Opt_noac:
945 mnt->flags |= NFS_MOUNT_NOAC;
946 break;
947 case Opt_lock:
948 mnt->flags &= ~NFS_MOUNT_NONLM;
949 break;
950 case Opt_nolock:
951 mnt->flags |= NFS_MOUNT_NONLM;
952 break;
953 case Opt_v2:
954 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 955 mnt->version = 2;
bf0fd768
CL		 956 break;
957 case Opt_v3:
958 mnt->flags |= NFS_MOUNT_VER3;
764302cc 959 mnt->version = 3;
bf0fd768 960 break;
764302cc
CL		 961#ifdef CONFIG_NFS_V4
962 case Opt_v4:
963 mnt->flags &= ~NFS_MOUNT_VER3;
964 mnt->version = 4;
965 break;
966#endif
bf0fd768
CL		 967 case Opt_udp:
968 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 969 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 970 break;
971 case Opt_tcp:
972 mnt->flags |= NFS_MOUNT_TCP;
0896a725 973 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 974 break;
2cf7ff7a
TT		 975 case Opt_rdma:
976 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
977 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 978 xprt_load_transport(p);
2cf7ff7a 979 break;
bf0fd768
CL		 980 case Opt_acl:
981 mnt->flags &= ~NFS_MOUNT_NOACL;
982 break;
983 case Opt_noacl:
984 mnt->flags |= NFS_MOUNT_NOACL;
985 break;
986 case Opt_rdirplus:
987 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
988 break;
989 case Opt_nordirplus:
990 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
991 break;
75180df2
TM		 992 case Opt_sharecache:
993 mnt->flags &= ~NFS_MOUNT_UNSHARED;
994 break;
995 case Opt_nosharecache:
996 mnt->flags |= NFS_MOUNT_UNSHARED;
997 break;
d740351b
CL		 998 case Opt_resvport:
999 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1000 break;
1001 case Opt_noresvport:
1002 mnt->flags |= NFS_MOUNT_NORESVPORT;
1003 break;
b797cac7
DH		 1004 case Opt_fscache:
1005 mnt->options |= NFS_OPTION_FSCACHE;
1006 kfree(mnt->fscache_uniq);
1007 mnt->fscache_uniq = NULL;
1008 break;
1009 case Opt_nofscache:
1010 mnt->options &= ~NFS_OPTION_FSCACHE;
1011 kfree(mnt->fscache_uniq);
1012 mnt->fscache_uniq = NULL;
1013 break;
1014 case Opt_fscache_uniq:
1015 string = match_strdup(args);
1016 if (!string)
1017 goto out_nomem;
1018 kfree(mnt->fscache_uniq);
1019 mnt->fscache_uniq = string;
1020 mnt->options |= NFS_OPTION_FSCACHE;
1021 break;
bf0fd768 1022
f45663ce
CL		 1023 /*
1024 * options that take numeric values
1025 */
bf0fd768 1026 case Opt_port:
a5a16bae
CL		 1027 string = match_strdup(args);
1028 if (string == NULL)
1029 goto out_nomem;
1030 rc = strict_strtoul(string, 10, &option);
1031 kfree(string);
1032 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1033 goto out_invalid_value;
1034 mnt->nfs_server.port = option;
bf0fd768
CL		 1035 break;
1036 case Opt_rsize:
a5a16bae
CL		 1037 string = match_strdup(args);
1038 if (string == NULL)
1039 goto out_nomem;
1040 rc = strict_strtoul(string, 10, &option);
1041 kfree(string);
1042 if (rc != 0)
d23c45fd
CL		 1043 goto out_invalid_value;
1044 mnt->rsize = option;
bf0fd768
CL		 1045 break;
1046 case Opt_wsize:
a5a16bae
CL		 1047 string = match_strdup(args);
1048 if (string == NULL)
1049 goto out_nomem;
1050 rc = strict_strtoul(string, 10, &option);
1051 kfree(string);
1052 if (rc != 0)
d23c45fd
CL		 1053 goto out_invalid_value;
1054 mnt->wsize = option;
bf0fd768
CL		 1055 break;
1056 case Opt_bsize:
a5a16bae
CL		 1057 string = match_strdup(args);
1058 if (string == NULL)
1059 goto out_nomem;
1060 rc = strict_strtoul(string, 10, &option);
1061 kfree(string);
1062 if (rc != 0)
d23c45fd
CL		 1063 goto out_invalid_value;
1064 mnt->bsize = option;
bf0fd768
CL		 1065 break;
1066 case Opt_timeo:
a5a16bae
CL		 1067 string = match_strdup(args);
1068 if (string == NULL)
1069 goto out_nomem;
1070 rc = strict_strtoul(string, 10, &option);
1071 kfree(string);
1072 if (rc != 0 || option == 0)
d23c45fd
CL		 1073 goto out_invalid_value;
1074 mnt->timeo = option;
bf0fd768
CL		 1075 break;
1076 case Opt_retrans:
a5a16bae
CL		 1077 string = match_strdup(args);
1078 if (string == NULL)
1079 goto out_nomem;
1080 rc = strict_strtoul(string, 10, &option);
1081 kfree(string);
1082 if (rc != 0 || option == 0)
d23c45fd
CL		 1083 goto out_invalid_value;
1084 mnt->retrans = option;
bf0fd768
CL		 1085 break;
1086 case Opt_acregmin:
a5a16bae
CL		 1087 string = match_strdup(args);
1088 if (string == NULL)
1089 goto out_nomem;
1090 rc = strict_strtoul(string, 10, &option);
1091 kfree(string);
1092 if (rc != 0)
d23c45fd
CL		 1093 goto out_invalid_value;
1094 mnt->acregmin = option;
bf0fd768
CL		 1095 break;
1096 case Opt_acregmax:
a5a16bae
CL		 1097 string = match_strdup(args);
1098 if (string == NULL)
1099 goto out_nomem;
1100 rc = strict_strtoul(string, 10, &option);
1101 kfree(string);
1102 if (rc != 0)
d23c45fd
CL		 1103 goto out_invalid_value;
1104 mnt->acregmax = option;
bf0fd768
CL		 1105 break;
1106 case Opt_acdirmin:
a5a16bae
CL		 1107 string = match_strdup(args);
1108 if (string == NULL)
1109 goto out_nomem;
1110 rc = strict_strtoul(string, 10, &option);
1111 kfree(string);
1112 if (rc != 0)
d23c45fd
CL		 1113 goto out_invalid_value;
1114 mnt->acdirmin = option;
bf0fd768
CL		 1115 break;
1116 case Opt_acdirmax:
a5a16bae
CL		 1117 string = match_strdup(args);
1118 if (string == NULL)
1119 goto out_nomem;
1120 rc = strict_strtoul(string, 10, &option);
1121 kfree(string);
1122 if (rc != 0)
d23c45fd
CL		 1123 goto out_invalid_value;
1124 mnt->acdirmax = option;
bf0fd768
CL		 1125 break;
1126 case Opt_actimeo:
a5a16bae
CL		 1127 string = match_strdup(args);
1128 if (string == NULL)
1129 goto out_nomem;
1130 rc = strict_strtoul(string, 10, &option);
1131 kfree(string);
1132 if (rc != 0)
d23c45fd
CL		 1133 goto out_invalid_value;
1134 mnt->acregmin = mnt->acregmax =
1135 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1136 break;
1137 case Opt_namelen:
a5a16bae
CL		 1138 string = match_strdup(args);
1139 if (string == NULL)
1140 goto out_nomem;
1141 rc = strict_strtoul(string, 10, &option);
1142 kfree(string);
1143 if (rc != 0)
d23c45fd
CL		 1144 goto out_invalid_value;
1145 mnt->namlen = option;
bf0fd768
CL		 1146 break;
1147 case Opt_mountport:
a5a16bae
CL		 1148 string = match_strdup(args);
1149 if (string == NULL)
1150 goto out_nomem;
1151 rc = strict_strtoul(string, 10, &option);
1152 kfree(string);
1153 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1154 goto out_invalid_value;
1155 mnt->mount_server.port = option;
bf0fd768 1156 break;
bf0fd768 1157 case Opt_mountvers:
a5a16bae
CL		 1158 string = match_strdup(args);
1159 if (string == NULL)
1160 goto out_nomem;
1161 rc = strict_strtoul(string, 10, &option);
1162 kfree(string);
1163 if (rc != 0 ||
f45663ce 1164 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1165 option > NFS_MNT3_VERSION)
1166 goto out_invalid_value;
1167 mnt->mount_server.version = option;
bf0fd768 1168 break;
bf0fd768 1169 case Opt_nfsvers:
a5a16bae
CL		 1170 string = match_strdup(args);
1171 if (string == NULL)
1172 goto out_nomem;
1173 rc = strict_strtoul(string, 10, &option);
1174 kfree(string);
1175 if (rc != 0)
d23c45fd 1176 goto out_invalid_value;
bf0fd768 1177 switch (option) {
f45663ce 1178 case NFS2_VERSION:
bf0fd768 1179 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1180 mnt->version = 2;
bf0fd768 1181 break;
f45663ce 1182 case NFS3_VERSION:
bf0fd768 1183 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1184 mnt->version = 3;
1185 break;
1186#ifdef CONFIG_NFS_V4
1187 case NFS4_VERSION:
1188 mnt->flags &= ~NFS_MOUNT_VER3;
1189 mnt->version = 4;
bf0fd768 1190 break;
764302cc 1191#endif
bf0fd768 1192 default:
d23c45fd 1193 goto out_invalid_value;
bf0fd768
CL		 1194 }
1195 break;
3fd5be9e 1196 case Opt_minorversion:
f3f4f4ed
CL		 1197 string = match_strdup(args);
1198 if (string == NULL)
1199 goto out_nomem;
1200 rc = strict_strtoul(string, 10, &option);
1201 kfree(string);
1202 if (rc != 0)
1203 goto out_invalid_value;
1204 if (option > NFS4_MAX_MINOR_VERSION)
1205 goto out_invalid_value;
1206 mnt->minorversion = option;
3fd5be9e 1207 break;
bf0fd768 1208
f45663ce
CL		 1209 /*
1210 * options that take text values
1211 */
bf0fd768
CL		 1212 case Opt_sec:
1213 string = match_strdup(args);
1214 if (string == NULL)
1215 goto out_nomem;
01060c89 1216 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1217 kfree(string);
f45663ce 1218 if (!rc) {
f45663ce
CL		 1219 dfprintk(MOUNT, "NFS: unrecognized "
1220 "security flavor\n");
d23c45fd 1221 return 0;
f45663ce 1222 }
bf0fd768
CL		 1223 break;
1224 case Opt_proto:
1225 string = match_strdup(args);
1226 if (string == NULL)
1227 goto out_nomem;
1228 token = match_token(string,
1229 nfs_xprt_protocol_tokens, args);
bf0fd768
CL		 1230
1231 switch (token) {
fdb66ff4 1232 case Opt_xprt_udp:
bf0fd768 1233 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1234 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1235 kfree(string);
bf0fd768 1236 break;
fdb66ff4 1237 case Opt_xprt_tcp:
bf0fd768 1238 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1239 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1240 kfree(string);
bf0fd768 1241 break;
2cf7ff7a
TT		 1242 case Opt_xprt_rdma:
1243 /* vector side protocols to TCP */
1244 mnt->flags |= NFS_MOUNT_TCP;
1245 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1246 xprt_load_transport(string);
d23c45fd 1247 kfree(string);
2cf7ff7a 1248 break;
bf0fd768 1249 default:
f45663ce
CL		 1250 dfprintk(MOUNT, "NFS: unrecognized "
1251 "transport protocol\n");
4223a4a1 1252 kfree(string);
d23c45fd 1253 return 0;
bf0fd768
CL		 1254 }
1255 break;
1256 case Opt_mountproto:
1257 string = match_strdup(args);
1258 if (string == NULL)
1259 goto out_nomem;
1260 token = match_token(string,
1261 nfs_xprt_protocol_tokens, args);
d508afb4 1262 kfree(string);
bf0fd768
CL		 1263
1264 switch (token) {
fdb66ff4 1265 case Opt_xprt_udp:
0896a725 1266 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1267 break;
fdb66ff4 1268 case Opt_xprt_tcp:
0896a725 1269 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1270 break;
2cf7ff7a 1271 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1272 default:
f45663ce
CL		 1273 dfprintk(MOUNT, "NFS: unrecognized "
1274 "transport protocol\n");
d23c45fd 1275 return 0;
bf0fd768
CL		 1276 }
1277 break;
1278 case Opt_addr:
1279 string = match_strdup(args);
1280 if (string == NULL)
1281 goto out_nomem;
53a0b9c4
CL		 1282 mnt->nfs_server.addrlen =
1283 rpc_pton(string, strlen(string),
1284 (struct sockaddr *)
1285 &mnt->nfs_server.address,
1286 sizeof(mnt->nfs_server.address));
bf0fd768 1287 kfree(string);
53a0b9c4
CL		 1288 if (mnt->nfs_server.addrlen == 0)
1289 goto out_invalid_address;
bf0fd768
CL		 1290 break;
1291 case Opt_clientaddr:
1292 string = match_strdup(args);
1293 if (string == NULL)
1294 goto out_nomem;
fc601477 1295 kfree(mnt->client_address);
bf0fd768
CL		 1296 mnt->client_address = string;
1297 break;
33832034
CL		 1298 case Opt_mounthost:
1299 string = match_strdup(args);
1300 if (string == NULL)
1301 goto out_nomem;
fc601477 1302 kfree(mnt->mount_server.hostname);
33832034
CL		 1303 mnt->mount_server.hostname = string;
1304 break;
0ac83779 1305 case Opt_mountaddr:
bf0fd768
CL		 1306 string = match_strdup(args);
1307 if (string == NULL)
1308 goto out_nomem;
53a0b9c4
CL		 1309 mnt->mount_server.addrlen =
1310 rpc_pton(string, strlen(string),
1311 (struct sockaddr *)
1312 &mnt->mount_server.address,
1313 sizeof(mnt->mount_server.address));
bf0fd768 1314 kfree(string);
53a0b9c4
CL		 1315 if (mnt->mount_server.addrlen == 0)
1316 goto out_invalid_address;
bf0fd768 1317 break;
7973c1f1
TM		 1318 case Opt_lookupcache:
1319 string = match_strdup(args);
1320 if (string == NULL)
1321 goto out_nomem;
1322 token = match_token(string,
1323 nfs_lookupcache_tokens, args);
1324 kfree(string);
1325 switch (token) {
1326 case Opt_lookupcache_all:
1327 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1328 break;
1329 case Opt_lookupcache_positive:
1330 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1331 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1332 break;
1333 case Opt_lookupcache_none:
1334 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1335 break;
1336 default:
7973c1f1
TM		 1337 dfprintk(MOUNT, "NFS: invalid "
1338 "lookupcache argument\n");
d23c45fd 1339 return 0;
7973c1f1
TM		 1340 };
1341 break;
bf0fd768 1342
f45663ce
CL		 1343 /*
1344 * Special options
1345 */
1346 case Opt_sloppy:
1347 sloppy = 1;
1348 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1349 break;
bf0fd768
CL		 1350 case Opt_userspace:
1351 case Opt_deprecated:
d33e4dfe
CL		 1352 dfprintk(MOUNT, "NFS: ignoring mount option "
1353 "'%s'\n", p);
bf0fd768
CL		 1354 break;
1355
1356 default:
d23c45fd 1357 invalid_option = 1;
f45663ce
CL		 1358 dfprintk(MOUNT, "NFS: unrecognized mount option "
1359 "'%s'\n", p);
bf0fd768
CL		 1360 }
1361 }
1362
d23c45fd
CL		 1363 if (!sloppy && invalid_option)
1364 return 0;
1365
bf0fd768
CL		 1366 return 1;
1367
53a0b9c4
CL		 1368out_invalid_address:
1369 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1370 return 0;
d23c45fd 1371out_invalid_value:
53a0b9c4 1372 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1373 return 0;
bf0fd768
CL		 1374out_nomem:
1375 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1376 return 0;
f9c3a380
EP		 1377out_security_failure:
1378 free_secdata(secdata);
1379 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1380 return 0;
bf0fd768
CL		 1381}
1382
ec88f28d
CL		 1383/*
1384 * Match the requested auth flavors with the list returned by
1385 * the server. Returns zero and sets the mount's authentication
1386 * flavor on success; returns -EACCES if server does not support
1387 * the requested flavor.
1388 */
1389static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1390 struct nfs_mount_request *request)
1391{
1392 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1393
5eecfde6
CL		 1394 /*
1395 * Certain releases of Linux's mountd return an empty
1396 * flavor list. To prevent behavioral regression with
1397 * these servers (ie. rejecting mounts that used to
1398 * succeed), revert to pre-2.6.32 behavior (no checking)
1399 * if the returned flavor list is empty.
1400 */
1401 if (server_authlist_len == 0)
1402 return 0;
1403
ec88f28d
CL		 1404 /*
1405 * We avoid sophisticated negotiating here, as there are
1406 * plenty of cases where we can get it wrong, providing
1407 * either too little or too much security.
1408 *
1409 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1410 * flavor listed first. However, some servers list
1411 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1412 * preferred default, in args->auth_flavors[0] if user
1413 * didn't specify sec= mount option.
1414 */
1415 for (i = 0; i < args->auth_flavor_len; i++)
1416 for (j = 0; j < server_authlist_len; j++)
1417 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1418 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1419 request->auth_flavs[j]);
1420 args->auth_flavors[0] = request->auth_flavs[j];
1421 return 0;
1422 }
1423
1424 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1425 nfs_umount(request);
1426 return -EACCES;
1427}
1428
0076d7b7
CL		 1429/*
1430 * Use the remote server's MOUNT service to request the NFS file handle
1431 * corresponding to the provided path.
1432 */
1433static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1434 struct nfs_fh *root_fh)
1435{
ec88f28d
CL		 1436 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1437 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1438 struct nfs_mount_request request = {
1439 .sap = (struct sockaddr *)
1440 &args->mount_server.address,
1441 .dirpath = args->nfs_server.export_path,
1442 .protocol = args->mount_server.protocol,
1443 .fh = root_fh,
50a737f8 1444 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1445 .auth_flav_len = &server_authlist_len,
1446 .auth_flavs = server_authlist,
c5d120f8 1447 };
4c568017 1448 int status;
0076d7b7
CL		 1449
1450 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1451 switch (args->version) {
1452 default:
1453 args->mount_server.version = NFS_MNT3_VERSION;
1454 break;
1455 case 2:
1456 args->mount_server.version = NFS_MNT_VERSION;
1457 }
0076d7b7 1458 }
c5d120f8 1459 request.version = args->mount_server.version;
0076d7b7 1460
33832034 1461 if (args->mount_server.hostname)
c5d120f8 1462 request.hostname = args->mount_server.hostname;
33832034 1463 else
c5d120f8 1464 request.hostname = args->nfs_server.hostname;
33832034 1465
0076d7b7
CL		 1466 /*
1467 * Construct the mount server's address.
1468 */
4c568017 1469 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1470 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1471 args->nfs_server.addrlen);
1472 args->mount_server.addrlen = args->nfs_server.addrlen;
1473 }
c5d120f8 1474 request.salen = args->mount_server.addrlen;
f5855fec 1475 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1476
1477 /*
1478 * Now ask the mount server to map our export path
1479 * to a file handle.
1480 */
c5d120f8 1481 status = nfs_mount(&request);
ec88f28d
CL		 1482 if (status != 0) {
1483 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1484 request.hostname, status);
1485 return status;
1486 }
0076d7b7 1487
ec88f28d
CL		 1488 /*
1489 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1490 */
1491 if (args->mount_server.version != NFS_MNT3_VERSION)
1492 return 0;
1493 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1494}
1495
d1aa0825
CL		 1496static int nfs_parse_simple_hostname(const char *dev_name,
1497 char **hostname, size_t maxnamlen,
1498 char **export_path, size_t maxpathlen)
dc045898
CL		 1499{
1500 size_t len;
1501 char *colon, *comma;
1502
1503 colon = strchr(dev_name, ':');
1504 if (colon == NULL)
1505 goto out_bad_devname;
1506
1507 len = colon - dev_name;
1508 if (len > maxnamlen)
1509 goto out_hostname;
1510
1511 /* N.B. caller will free nfs_server.hostname in all cases */
1512 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1513 if (!*hostname)
1514 goto out_nomem;
1515
1516 /* kill possible hostname list: not supported */
1517 comma = strchr(*hostname, ',');
1518 if (comma != NULL) {
1519 if (comma == *hostname)
1520 goto out_bad_devname;
1521 *comma = '\0';
1522 }
1523
1524 colon++;
1525 len = strlen(colon);
1526 if (len > maxpathlen)
1527 goto out_path;
1528 *export_path = kstrndup(colon, len, GFP_KERNEL);
1529 if (!*export_path)
1530 goto out_nomem;
1531
1532 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1533 return 0;
1534
1535out_bad_devname:
1536 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1537 return -EINVAL;
1538
1539out_nomem:
1540 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1541 return -ENOMEM;
1542
1543out_hostname:
1544 dfprintk(MOUNT, "NFS: server hostname too long\n");
1545 return -ENAMETOOLONG;
1546
1547out_path:
1548 dfprintk(MOUNT, "NFS: export pathname too long\n");
1549 return -ENAMETOOLONG;
1550}
1551
d1aa0825
CL		 1552/*
1553 * Hostname has square brackets around it because it contains one or
1554 * more colons. We look for the first closing square bracket, and a
1555 * colon must follow it.
1556 */
1557static int nfs_parse_protected_hostname(const char *dev_name,
1558 char **hostname, size_t maxnamlen,
1559 char **export_path, size_t maxpathlen)
1560{
1561 size_t len;
1562 char *start, *end;
1563
1564 start = (char *)(dev_name + 1);
1565
1566 end = strchr(start, ']');
1567 if (end == NULL)
1568 goto out_bad_devname;
1569 if (*(end + 1) != ':')
1570 goto out_bad_devname;
1571
1572 len = end - start;
1573 if (len > maxnamlen)
1574 goto out_hostname;
1575
1576 /* N.B. caller will free nfs_server.hostname in all cases */
1577 *hostname = kstrndup(start, len, GFP_KERNEL);
1578 if (*hostname == NULL)
1579 goto out_nomem;
1580
1581 end += 2;
1582 len = strlen(end);
1583 if (len > maxpathlen)
1584 goto out_path;
1585 *export_path = kstrndup(end, len, GFP_KERNEL);
1586 if (!*export_path)
1587 goto out_nomem;
1588
1589 return 0;
1590
1591out_bad_devname:
1592 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1593 return -EINVAL;
1594
1595out_nomem:
1596 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1597 return -ENOMEM;
1598
1599out_hostname:
1600 dfprintk(MOUNT, "NFS: server hostname too long\n");
1601 return -ENAMETOOLONG;
1602
1603out_path:
1604 dfprintk(MOUNT, "NFS: export pathname too long\n");
1605 return -ENAMETOOLONG;
1606}
1607
1608/*
1609 * Split "dev_name" into "hostname:export_path".
1610 *
1611 * The leftmost colon demarks the split between the server's hostname
1612 * and the export path. If the hostname starts with a left square
1613 * bracket, then it may contain colons.
1614 *
1615 * Note: caller frees hostname and export path, even on error.
1616 */
1617static int nfs_parse_devname(const char *dev_name,
1618 char **hostname, size_t maxnamlen,
1619 char **export_path, size_t maxpathlen)
1620{
1621 if (*dev_name == '[')
1622 return nfs_parse_protected_hostname(dev_name,
1623 hostname, maxnamlen,
1624 export_path, maxpathlen);
1625
1626 return nfs_parse_simple_hostname(dev_name,
1627 hostname, maxnamlen,
1628 export_path, maxpathlen);
1629}
1630
f7b422b1 1631/*
54ceac45
DH		 1632 * Validate the NFS2/NFS3 mount data
1633 * - fills in the mount root filehandle
136d558c
CL		 1634 *
1635 * For option strings, user space handles the following behaviors:
1636 *
1637 * + DNS: mapping server host name to IP address ("addr=" option)
1638 *
1639 * + failure mode: how to behave if a mount request can't be handled
1640 * immediately ("fg/bg" option)
1641 *
1642 * + retry: how often to retry a mount request ("retry=" option)
1643 *
1644 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1645 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1646 */
2283f8d6
TT		 1647static int nfs_validate_mount_data(void *options,
1648 struct nfs_parsed_mount_data *args,
136d558c
CL		 1649 struct nfs_fh *mntfh,
1650 const char *dev_name)
f7b422b1 1651{
2283f8d6 1652 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1653 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1654
5df36e78
CL		 1655 if (data == NULL)
1656 goto out_no_data;
f7b422b1 1657
54ceac45 1658 switch (data->version) {
5df36e78
CL		 1659 case 1:
1660 data->namlen = 0;
1661 case 2:
1662 data->bsize = 0;
1663 case 3:
1664 if (data->flags & NFS_MOUNT_VER3)
1665 goto out_no_v3;
1666 data->root.size = NFS2_FHSIZE;
1667 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1668 case 4:
1669 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1670 goto out_no_sec;
1671 case 5:
1672 memset(data->context, 0, sizeof(data->context));
1673 case 6:
b7e24457
TM		 1674 if (data->flags & NFS_MOUNT_VER3) {
1675 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1676 goto out_invalid_fh;
5df36e78 1677 mntfh->size = data->root.size;
764302cc
CL		 1678 args->version = 3;
1679 } else {
5df36e78 1680 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1681 args->version = 2;
1682 }
5df36e78 1683
5df36e78
CL		 1684
1685 memcpy(mntfh->data, data->root.data, mntfh->size);
1686 if (mntfh->size < sizeof(mntfh->data))
1687 memset(mntfh->data + mntfh->size, 0,
1688 sizeof(mntfh->data) - mntfh->size);
6e88e061 1689
2283f8d6
TT		 1690 /*
1691 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1692 * can deal with.
1693 */
ff3525a5 1694 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1695 args->rsize = data->rsize;
1696 args->wsize = data->wsize;
2283f8d6
TT		 1697 args->timeo = data->timeo;
1698 args->retrans = data->retrans;
1699 args->acregmin = data->acregmin;
1700 args->acregmax = data->acregmax;
1701 args->acdirmin = data->acdirmin;
1702 args->acdirmax = data->acdirmax;
4c568017 1703
4cfd74fc 1704 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1705 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1706 if (!nfs_verify_server_address(sap))
4c568017
CL		 1707 goto out_no_address;
1708
2283f8d6 1709 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1710 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1711 /* N.B. caller will free nfs_server.hostname in all cases */
1712 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1713 args->namlen = data->namlen;
1714 args->bsize = data->bsize;
dd07c947
CL		 1715
1716 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1717 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1718 if (!args->nfs_server.hostname)
1719 goto out_nomem;
f9c3a380
EP		 1720
1721 /*
1722 * The legacy version 6 binary mount data from userspace has a
1723 * field used only to transport selinux information into the
1724 * the kernel. To continue to support that functionality we
1725 * have a touch of selinux knowledge here in the NFS code. The
1726 * userspace code converted context=blah to just blah so we are
1727 * converting back to the full string selinux understands.
1728 */
1729 if (data->context[0]){
1730#ifdef CONFIG_SECURITY_SELINUX
1731 int rc;
1732 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1733 if (!opts_str)
1734 return -ENOMEM;
1735 strcpy(opts_str, "context=");
1736 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1737 strcat(opts_str, &data->context[0]);
1738 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1739 kfree(opts_str);
1740 if (rc)
1741 return rc;
1742#else
1743 return -EINVAL;
1744#endif
1745 }
1746
5df36e78 1747 break;
136d558c 1748 default: {
136d558c 1749 int status;
136d558c 1750
2283f8d6
TT		 1751 if (nfs_parse_mount_options((char *)options, args) == 0)
1752 return -EINVAL;
136d558c 1753
4cfd74fc 1754 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1755 goto out_no_address;
1756
764302cc
CL		 1757 if (args->version == 4)
1758#ifdef CONFIG_NFS_V4
1759 return nfs4_validate_text_mount_data(options,
1760 args, dev_name);
1761#else
1762 goto out_v4_not_compiled;
1763#endif
1764
f5855fec 1765 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1766
259875ef
TM		 1767 nfs_set_mount_transport_protocol(args);
1768
dc045898
CL		 1769 status = nfs_parse_devname(dev_name,
1770 &args->nfs_server.hostname,
1771 PAGE_SIZE,
1772 &args->nfs_server.export_path,
1773 NFS_MAXPATHLEN);
1774 if (!status)
1775 status = nfs_try_mount(args, mntfh);
136d558c 1776
dc045898
CL		 1777 kfree(args->nfs_server.export_path);
1778 args->nfs_server.export_path = NULL;
136d558c 1779
136d558c 1780 if (status)
fdc6e2c8 1781 return status;
136d558c 1782
136d558c
CL		 1783 break;
1784 }
f7b422b1 1785 }
54ceac45
DH		 1786
1787#ifndef CONFIG_NFS_V3
8a6e5deb 1788 if (args->version == 3)
5df36e78
CL		 1789 goto out_v3_not_compiled;
1790#endif /* !CONFIG_NFS_V3 */
f7b422b1 1791
5df36e78 1792 return 0;
f7b422b1 1793
5df36e78
CL		 1794out_no_data:
1795 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1796 return -EINVAL;
54ceac45 1797
5df36e78
CL		 1798out_no_v3:
1799 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1800 data->version);
1801 return -EINVAL;
f7b422b1 1802
5df36e78
CL		 1803out_no_sec:
1804 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1805 return -EINVAL;
1806
5df36e78
CL		 1807#ifndef CONFIG_NFS_V3
1808out_v3_not_compiled:
1809 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1810 return -EPROTONOSUPPORT;
1811#endif /* !CONFIG_NFS_V3 */
1812
764302cc
CL		 1813#ifndef CONFIG_NFS_V4
1814out_v4_not_compiled:
1815 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1816 return -EPROTONOSUPPORT;
1817#endif /* !CONFIG_NFS_V4 */
1818
63649bd7
CG		 1819out_nomem:
1820 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1821 return -ENOMEM;
1822
5df36e78
CL		 1823out_no_address:
1824 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1825 return -EINVAL;
1826
1827out_invalid_fh:
1828 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1829 return -EINVAL;
f7b422b1
DH		 1830}
1831
48b605f8
JL		 1832static int
1833nfs_compare_remount_data(struct nfs_server *nfss,
1834 struct nfs_parsed_mount_data *data)
1835{
1836 if (data->flags != nfss->flags ||
1837 data->rsize != nfss->rsize ||
1838 data->wsize != nfss->wsize ||
1839 data->retrans != nfss->client->cl_timeout->to_retries ||
1840 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1841 data->acregmin != nfss->acregmin / HZ ||
1842 data->acregmax != nfss->acregmax / HZ ||
1843 data->acdirmin != nfss->acdirmin / HZ ||
1844 data->acdirmax != nfss->acdirmax / HZ ||
1845 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1846 data->nfs_server.port != nfss->port ||
48b605f8 1847 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1848 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1849 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1850 return -EINVAL;
1851
1852 return 0;
1853}
1854
1855static int
1856nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1857{
1858 int error;
1859 struct nfs_server *nfss = sb->s_fs_info;
1860 struct nfs_parsed_mount_data *data;
1861 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1862 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1863 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1864
1865 /*
1866 * Userspace mount programs that send binary options generally send
1867 * them populated with default values. We have no way to know which
1868 * ones were explicitly specified. Fall back to legacy behavior and
1869 * just return success.
1870 */
31c94469
MZ		 1871 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1872 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1873 options->version <= 6))))
48b605f8
JL		 1874 return 0;
1875
1876 data = kzalloc(sizeof(*data), GFP_KERNEL);
1877 if (data == NULL)
1878 return -ENOMEM;
1879
1880 /* fill out struct with values from existing mount */
1881 data->flags = nfss->flags;
1882 data->rsize = nfss->rsize;
1883 data->wsize = nfss->wsize;
1884 data->retrans = nfss->client->cl_timeout->to_retries;
1885 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1886 data->acregmin = nfss->acregmin / HZ;
1887 data->acregmax = nfss->acregmax / HZ;
1888 data->acdirmin = nfss->acdirmin / HZ;
1889 data->acdirmax = nfss->acdirmax / HZ;
1890 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 1891 data->nfs_server.port = nfss->port;
48b605f8
JL		 1892 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1893 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1894 data->nfs_server.addrlen);
1895
1896 /* overwrite those values with any that were specified */
1897 error = nfs_parse_mount_options((char *)options, data);
1898 if (error < 0)
1899 goto out;
1900
1901 /* compare new mount options with old ones */
1902 error = nfs_compare_remount_data(nfss, data);
1903out:
1904 kfree(data);
1905 return error;
1906}
1907
f7b422b1 1908/*
54ceac45 1909 * Initialise the common bits of the superblock
f7b422b1 1910 */
54ceac45 1911static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1912{
54ceac45 1913 struct nfs_server *server = NFS_SB(sb);
5006a76c 1914
54ceac45 1915 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1916
54ceac45
DH		 1917 /* We probably want something more informative here */
1918 snprintf(sb->s_id, sizeof(sb->s_id),
1919 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1920
54ceac45
DH		 1921 if (sb->s_blocksize == 0)
1922 sb->s_blocksize = nfs_block_bits(server->wsize,
1923 &sb->s_blocksize_bits);
f7b422b1 1924
54ceac45
DH		 1925 if (server->flags & NFS_MOUNT_NOAC)
1926 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1927
32a88aa1
JA		 1928 sb->s_bdi = &server->backing_dev_info;
1929
54ceac45 1930 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1931}
1932
1933/*
54ceac45 1934 * Finish setting up an NFS2/3 superblock
f7b422b1 1935 */
2283f8d6
TT		 1936static void nfs_fill_super(struct super_block *sb,
1937 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1938{
1939 struct nfs_server *server = NFS_SB(sb);
5006a76c 1940
54ceac45
DH		 1941 sb->s_blocksize_bits = 0;
1942 sb->s_blocksize = 0;
1943 if (data->bsize)
1944 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1945
8a6e5deb 1946 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 1947 /* The VFS shouldn't apply the umask to mode bits. We will do
1948 * so ourselves when necessary.
1949 */
1950 sb->s_flags |= MS_POSIXACL;
1951 sb->s_time_gran = 1;
816724e6 1952 }
54ceac45
DH		 1953
1954 sb->s_op = &nfs_sops;
1955 nfs_initialise_sb(sb);
f7b422b1
DH		 1956}
1957
1958/*
54ceac45 1959 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1960 */
54ceac45
DH		 1961static void nfs_clone_super(struct super_block *sb,
1962 const struct super_block *old_sb)
f7b422b1 1963{
54ceac45
DH		 1964 struct nfs_server *server = NFS_SB(sb);
1965
1966 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1967 sb->s_blocksize = old_sb->s_blocksize;
1968 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1969
8a6e5deb 1970 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 1971 /* The VFS shouldn't apply the umask to mode bits. We will do
1972 * so ourselves when necessary.
f7b422b1
DH		 1973 */
1974 sb->s_flags |= MS_POSIXACL;
f7b422b1 1975 sb->s_time_gran = 1;
f7b422b1
DH		 1976 }
1977
54ceac45
DH		 1978 sb->s_op = old_sb->s_op;
1979 nfs_initialise_sb(sb);
f7b422b1
DH		 1980}
1981
275a5d24
TM		 1982static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1983{
1984 const struct nfs_server *a = s->s_fs_info;
1985 const struct rpc_clnt *clnt_a = a->client;
1986 const struct rpc_clnt *clnt_b = b->client;
1987
1988 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1989 goto Ebusy;
1990 if (a->nfs_client != b->nfs_client)
1991 goto Ebusy;
1992 if (a->flags != b->flags)
1993 goto Ebusy;
1994 if (a->wsize != b->wsize)
1995 goto Ebusy;
1996 if (a->rsize != b->rsize)
1997 goto Ebusy;
1998 if (a->acregmin != b->acregmin)
1999 goto Ebusy;
2000 if (a->acregmax != b->acregmax)
2001 goto Ebusy;
2002 if (a->acdirmin != b->acdirmin)
2003 goto Ebusy;
2004 if (a->acdirmax != b->acdirmax)
2005 goto Ebusy;
2006 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2007 goto Ebusy;
e89a5a43 2008 return 1;
275a5d24 2009Ebusy:
e89a5a43
TM		 2010 return 0;
2011}
2012
2013struct nfs_sb_mountdata {
2014 struct nfs_server *server;
2015 int mntflags;
2016};
2017
2018static int nfs_set_super(struct super_block *s, void *data)
2019{
2020 struct nfs_sb_mountdata *sb_mntdata = data;
2021 struct nfs_server *server = sb_mntdata->server;
2022 int ret;
2023
2024 s->s_flags = sb_mntdata->mntflags;
2025 s->s_fs_info = server;
2026 ret = set_anon_super(s, server);
2027 if (ret == 0)
2028 server->s_dev = s->s_dev;
2029 return ret;
2030}
2031
fd00a8ff
CL		 2032static int nfs_compare_super_address(struct nfs_server *server1,
2033 struct nfs_server *server2)
2034{
2035 struct sockaddr *sap1, *sap2;
2036
2037 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2038 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2039
2040 if (sap1->sa_family != sap2->sa_family)
2041 return 0;
2042
2043 switch (sap1->sa_family) {
2044 case AF_INET: {
2045 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2046 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2047 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2048 return 0;
2049 if (sin1->sin_port != sin2->sin_port)
2050 return 0;
2051 break;
2052 }
2053 case AF_INET6: {
2054 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2055 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2056 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2057 return 0;
2058 if (sin1->sin6_port != sin2->sin6_port)
2059 return 0;
2060 break;
2061 }
2062 default:
2063 return 0;
2064 }
2065
2066 return 1;
2067}
2068
e89a5a43
TM		 2069static int nfs_compare_super(struct super_block *sb, void *data)
2070{
2071 struct nfs_sb_mountdata *sb_mntdata = data;
2072 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2073 int mntflags = sb_mntdata->mntflags;
2074
fd00a8ff 2075 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2076 return 0;
2077 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2078 if (old->flags & NFS_MOUNT_UNSHARED)
2079 return 0;
2080 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2081 return 0;
2082 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2083}
2084
fa799759
MS		 2085static int nfs_bdi_register(struct nfs_server *server)
2086{
2087 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2088}
2089
816724e6
TM		 2090static int nfs_get_sb(struct file_system_type *fs_type,
2091 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2092{
f7b422b1
DH		 2093 struct nfs_server *server = NULL;
2094 struct super_block *s;
33852a1f
TM		 2095 struct nfs_parsed_mount_data *data;
2096 struct nfs_fh *mntfh;
54ceac45 2097 struct dentry *mntroot;
75180df2 2098 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2099 struct nfs_sb_mountdata sb_mntdata = {
2100 .mntflags = flags,
2101 };
33852a1f
TM		 2102 int error = -ENOMEM;
2103
c5811dbd 2104 data = nfs_alloc_parsed_mount_data(3);
33852a1f
TM		 2105 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2106 if (data == NULL || mntfh == NULL)
2107 goto out_free_fh;
f7b422b1 2108
33852a1f 2109 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2110
54ceac45 2111 /* Validate the mount data */
33852a1f 2112 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2113 if (error < 0)
0655960f 2114 goto out;
f7b422b1 2115
764302cc
CL		 2116#ifdef CONFIG_NFS_V4
2117 if (data->version == 4) {
2118 error = nfs4_try_mount(flags, dev_name, data, mnt);
2119 kfree(data->client_address);
2120 goto out;
2121 }
2122#endif /* CONFIG_NFS_V4 */
2123
54ceac45 2124 /* Get a volume representation */
33852a1f 2125 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2126 if (IS_ERR(server)) {
2127 error = PTR_ERR(server);
0655960f 2128 goto out;
f7b422b1 2129 }
e89a5a43 2130 sb_mntdata.server = server;
f7b422b1 2131
75180df2
TM		 2132 if (server->flags & NFS_MOUNT_UNSHARED)
2133 compare_super = NULL;
2134
54ceac45 2135 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2136 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2137 if (IS_ERR(s)) {
2138 error = PTR_ERR(s);
54ceac45 2139 goto out_err_nosb;
816724e6
TM		 2140 }
2141
54ceac45
DH		 2142 if (s->s_fs_info != server) {
2143 nfs_free_server(server);
2144 server = NULL;
fa799759
MS		 2145 } else {
2146 error = nfs_bdi_register(server);
2147 if (error)
2148 goto error_splat_super;
54ceac45 2149 }
f7b422b1 2150
54ceac45
DH		 2151 if (!s->s_root) {
2152 /* initial superblock/root creation */
33852a1f 2153 nfs_fill_super(s, data);
2df54806
DH		 2154 nfs_fscache_get_super_cookie(
2155 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2156 }
f7b422b1 2157
33852a1f 2158 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2159 if (IS_ERR(mntroot)) {
2160 error = PTR_ERR(mntroot);
2161 goto error_splat_super;
f7b422b1 2162 }
816724e6 2163
33852a1f 2164 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2165 if (error)
2166 goto error_splat_root;
2167
54ceac45
DH		 2168 s->s_flags |= MS_ACTIVE;
2169 mnt->mnt_sb = s;
2170 mnt->mnt_root = mntroot;
0655960f
CL		 2171 error = 0;
2172
2173out:
33852a1f
TM		 2174 kfree(data->nfs_server.hostname);
2175 kfree(data->mount_server.hostname);
08734048 2176 kfree(data->fscache_uniq);
33852a1f
TM		 2177 security_free_mnt_opts(&data->lsm_opts);
2178out_free_fh:
2179 kfree(mntfh);
2180 kfree(data);
0655960f 2181 return error;
816724e6 2182
54ceac45
DH		 2183out_err_nosb:
2184 nfs_free_server(server);
0655960f 2185 goto out;
54ceac45 2186
f9c3a380
EP		 2187error_splat_root:
2188 dput(mntroot);
54ceac45 2189error_splat_super:
6f5bbff9 2190 deactivate_locked_super(s);
0655960f 2191 goto out;
f7b422b1
DH		 2192}
2193
54ceac45
DH		 2194/*
2195 * Destroy an NFS2/3 superblock
2196 */
f7b422b1
DH		 2197static void nfs_kill_super(struct super_block *s)
2198{
2199 struct nfs_server *server = NFS_SB(s);
2200
2201 kill_anon_super(s);
92f25053 2202 bdi_unregister(&server->backing_dev_info);
08734048 2203 nfs_fscache_release_super_cookie(s);
54ceac45 2204 nfs_free_server(server);
f7b422b1
DH		 2205}
2206
54ceac45
DH		 2207/*
2208 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2209 */
2210static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2211 const char *dev_name, void *raw_data,
2212 struct vfsmount *mnt)
f7b422b1
DH		 2213{
2214 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2215 struct super_block *s;
2216 struct nfs_server *server;
2217 struct dentry *mntroot;
75180df2 2218 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2219 struct nfs_sb_mountdata sb_mntdata = {
2220 .mntflags = flags,
2221 };
54ceac45 2222 int error;
f7b422b1 2223
54ceac45 2224 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2225
54ceac45
DH		 2226 /* create a new volume representation */
2227 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2228 if (IS_ERR(server)) {
2229 error = PTR_ERR(server);
2230 goto out_err_noserver;
2231 }
e89a5a43 2232 sb_mntdata.server = server;
8fa5c000 2233
75180df2
TM		 2234 if (server->flags & NFS_MOUNT_UNSHARED)
2235 compare_super = NULL;
2236
54ceac45 2237 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2238 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2239 if (IS_ERR(s)) {
2240 error = PTR_ERR(s);
2241 goto out_err_nosb;
2242 }
5006a76c 2243
54ceac45
DH		 2244 if (s->s_fs_info != server) {
2245 nfs_free_server(server);
2246 server = NULL;
fa799759
MS		 2247 } else {
2248 error = nfs_bdi_register(server);
2249 if (error)
2250 goto error_splat_super;
f7b422b1 2251 }
24c8dbbb 2252
54ceac45
DH		 2253 if (!s->s_root) {
2254 /* initial superblock/root creation */
54ceac45 2255 nfs_clone_super(s, data->sb);
2df54806 2256 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2257 }
f7b422b1 2258
54ceac45
DH		 2259 mntroot = nfs_get_root(s, data->fh);
2260 if (IS_ERR(mntroot)) {
2261 error = PTR_ERR(mntroot);
2262 goto error_splat_super;
f7b422b1 2263 }
e9cc6c23 2264 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2265 dput(mntroot);
2266 error = -ESTALE;
2267 goto error_splat_super;
2268 }
f7b422b1 2269
54ceac45
DH		 2270 s->s_flags |= MS_ACTIVE;
2271 mnt->mnt_sb = s;
2272 mnt->mnt_root = mntroot;
f7b422b1 2273
f9c3a380
EP		 2274 /* clone any lsm security options from the parent to the new sb */
2275 security_sb_clone_mnt_opts(data->sb, s);
2276
54ceac45
DH		 2277 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2278 return 0;
24c8dbbb 2279
54ceac45
DH		 2280out_err_nosb:
2281 nfs_free_server(server);
2282out_err_noserver:
2283 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2284 return error;
f7b422b1 2285
54ceac45 2286error_splat_super:
6f5bbff9 2287 deactivate_locked_super(s);
54ceac45
DH		 2288 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2289 return error;
f7b422b1
DH		 2290}
2291
54ceac45
DH		 2292#ifdef CONFIG_NFS_V4
2293
f7b422b1 2294/*
54ceac45 2295 * Finish setting up a cloned NFS4 superblock
f7b422b1 2296 */
54ceac45
DH		 2297static void nfs4_clone_super(struct super_block *sb,
2298 const struct super_block *old_sb)
f7b422b1 2299{
54ceac45
DH		 2300 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2301 sb->s_blocksize = old_sb->s_blocksize;
2302 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2303 sb->s_time_gran = 1;
54ceac45
DH		 2304 sb->s_op = old_sb->s_op;
2305 nfs_initialise_sb(sb);
f7b422b1
DH		 2306}
2307
54ceac45
DH		 2308/*
2309 * Set up an NFS4 superblock
2310 */
2311static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2312{
54ceac45
DH		 2313 sb->s_time_gran = 1;
2314 sb->s_op = &nfs4_sops;
2315 nfs_initialise_sb(sb);
f7b422b1
DH		 2316}
2317
01c3f052
TM		 2318static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2319{
2320 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2321}
2322
7630c852
CL		 2323static int nfs4_validate_text_mount_data(void *options,
2324 struct nfs_parsed_mount_data *args,
2325 const char *dev_name)
2326{
2327 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2328
f5855fec 2329 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2330
2331 nfs_validate_transport_protocol(args);
2332
2333 nfs4_validate_mount_flags(args);
2334
2ecda72b
TM		 2335 if (args->version != 4) {
2336 dfprintk(MOUNT,
2337 "NFS4: Illegal mount version\n");
2338 return -EINVAL;
2339 }
2340
7630c852
CL		 2341 if (args->auth_flavor_len > 1) {
2342 dfprintk(MOUNT,
2343 "NFS4: Too many RPC auth flavours specified\n");
2344 return -EINVAL;
2345 }
2346
2347 if (args->client_address == NULL) {
2348 dfprintk(MOUNT,
2349 "NFS4: mount program didn't pass callback address\n");
2350 return -EINVAL;
2351 }
2352
2353 return nfs_parse_devname(dev_name,
2354 &args->nfs_server.hostname,
2355 NFS4_MAXNAMLEN,
2356 &args->nfs_server.export_path,
2357 NFS4_MAXPATHLEN);
2358}
2359
f0768ebd
CL		 2360/*
2361 * Validate NFSv4 mount options
2362 */
91ea40b9
TT		 2363static int nfs4_validate_mount_data(void *options,
2364 struct nfs_parsed_mount_data *args,
2365 const char *dev_name)
f0768ebd 2366{
4cfd74fc 2367 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2368 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2369 char *c;
2370
2371 if (data == NULL)
2372 goto out_no_data;
2373
2374 switch (data->version) {
2375 case 1:
4c568017
CL		 2376 if (data->host_addrlen > sizeof(args->nfs_server.address))
2377 goto out_no_address;
2378 if (data->host_addrlen == 0)
f0768ebd 2379 goto out_no_address;
4c568017 2380 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2381 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2382 return -EFAULT;
4cfd74fc 2383 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2384 goto out_no_address;
2385
6738b251
CL		 2386 if (data->auth_flavourlen) {
2387 if (data->auth_flavourlen > 1)
2388 goto out_inval_auth;
20c71f5e 2389 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2390 data->auth_flavours,
20c71f5e 2391 sizeof(args->auth_flavors[0])))
f0768ebd 2392 return -EFAULT;
f0768ebd
CL		 2393 }
2394
2395 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2396 if (IS_ERR(c))
2397 return PTR_ERR(c);
91ea40b9 2398 args->nfs_server.hostname = c;
f0768ebd
CL		 2399
2400 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2401 if (IS_ERR(c))
2402 return PTR_ERR(c);
91ea40b9
TT		 2403 args->nfs_server.export_path = c;
2404 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2405
2406 c = strndup_user(data->client_addr.data, 16);
2407 if (IS_ERR(c))
2408 return PTR_ERR(c);
91ea40b9
TT		 2409 args->client_address = c;
2410
2411 /*
2412 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2413 * can deal with.
2414 */
2415
2416 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2417 args->rsize = data->rsize;
2418 args->wsize = data->wsize;
2419 args->timeo = data->timeo;
2420 args->retrans = data->retrans;
2421 args->acregmin = data->acregmin;
2422 args->acregmax = data->acregmax;
2423 args->acdirmin = data->acdirmin;
2424 args->acdirmax = data->acdirmax;
2425 args->nfs_server.protocol = data->proto;
259875ef 2426 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2427
2428 break;
7630c852 2429 default:
91ea40b9 2430 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2431 return -EINVAL;
2432
4cfd74fc 2433 if (!nfs_verify_server_address(sap))
80071225 2434 return -EINVAL;
dc045898 2435
7630c852 2436 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2437 }
2438
2439 return 0;
2440
2441out_no_data:
2442 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2443 return -EINVAL;
2444
2445out_inval_auth:
2446 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2447 data->auth_flavourlen);
2448 return -EINVAL;
2449
2450out_no_address:
2451 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2452 return -EINVAL;
f0768ebd
CL		 2453}
2454
54ceac45 2455/*
c02d7adf 2456 * Get the superblock for the NFS4 root partition
54ceac45 2457 */
c02d7adf 2458static int nfs4_remote_get_sb(struct file_system_type *fs_type,
816724e6 2459 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2460{
c02d7adf 2461 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2462 struct super_block *s;
2463 struct nfs_server *server;
33852a1f 2464 struct nfs_fh *mntfh;
54ceac45 2465 struct dentry *mntroot;
75180df2 2466 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2467 struct nfs_sb_mountdata sb_mntdata = {
2468 .mntflags = flags,
2469 };
33852a1f
TM		 2470 int error = -ENOMEM;
2471
33852a1f
TM		 2472 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2473 if (data == NULL || mntfh == NULL)
2474 goto out_free_fh;
f7b422b1 2475
33852a1f 2476 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2477
54ceac45 2478 /* Get a volume representation */
33852a1f 2479 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2480 if (IS_ERR(server)) {
2481 error = PTR_ERR(server);
29eb981a 2482 goto out;
f7b422b1 2483 }
e89a5a43 2484 sb_mntdata.server = server;
f7b422b1 2485
75180df2
TM		 2486 if (server->flags & NFS4_MOUNT_UNSHARED)
2487 compare_super = NULL;
2488
54ceac45 2489 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2490 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2491 if (IS_ERR(s)) {
2492 error = PTR_ERR(s);
f7b422b1 2493 goto out_free;
816724e6
TM		 2494 }
2495
5dd3177a
TM		 2496 if (s->s_fs_info != server) {
2497 nfs_free_server(server);
2498 server = NULL;
fa799759
MS		 2499 } else {
2500 error = nfs_bdi_register(server);
2501 if (error)
2502 goto error_splat_super;
5dd3177a
TM		 2503 }
2504
54ceac45
DH		 2505 if (!s->s_root) {
2506 /* initial superblock/root creation */
54ceac45 2507 nfs4_fill_super(s);
2df54806
DH		 2508 nfs_fscache_get_super_cookie(
2509 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2510 }
f7b422b1 2511
33852a1f 2512 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2513 if (IS_ERR(mntroot)) {
2514 error = PTR_ERR(mntroot);
2515 goto error_splat_super;
f7b422b1 2516 }
54ceac45 2517
33852a1f 2518 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2519 if (error)
2520 goto error_splat_root;
2521
f7b422b1 2522 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2523 mnt->mnt_sb = s;
2524 mnt->mnt_root = mntroot;
29eb981a
CL		 2525 error = 0;
2526
2527out:
33852a1f
TM		 2528 security_free_mnt_opts(&data->lsm_opts);
2529out_free_fh:
2530 kfree(mntfh);
29eb981a 2531 return error;
54ceac45 2532
f7b422b1 2533out_free:
54ceac45 2534 nfs_free_server(server);
29eb981a 2535 goto out;
54ceac45 2536
46c8ac74
EP		 2537error_splat_root:
2538 dput(mntroot);
54ceac45 2539error_splat_super:
6f5bbff9 2540 deactivate_locked_super(s);
29eb981a 2541 goto out;
f7b422b1
DH		 2542}
2543
c02d7adf
TM		 2544static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2545 int flags, void *data, const char *hostname)
2546{
2547 struct vfsmount *root_mnt;
2548 char *root_devname;
2549 size_t len;
2550
2551 len = strlen(hostname) + 3;
2552 root_devname = kmalloc(len, GFP_KERNEL);
2553 if (root_devname == NULL)
2554 return ERR_PTR(-ENOMEM);
2555 snprintf(root_devname, len, "%s:/", hostname);
2556 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2557 kfree(root_devname);
2558 return root_mnt;
2559}
2560
b88f8a54
TM		 2561static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2562{
2563 char *page = (char *) __get_free_page(GFP_KERNEL);
2564 char *devname, *tmp;
2565
2566 if (page == NULL)
2567 return;
2568 devname = nfs_path(path->mnt->mnt_devname,
2569 path->mnt->mnt_root, path->dentry,
2570 page, PAGE_SIZE);
2571 if (devname == NULL)
2572 goto out_freepage;
2573 tmp = kstrdup(devname, GFP_KERNEL);
2574 if (tmp == NULL)
2575 goto out_freepage;
2576 kfree(mnt->mnt_devname);
2577 mnt->mnt_devname = tmp;
2578out_freepage:
2579 free_page((unsigned long)page);
2580}
2581
c02d7adf
TM		 2582static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2583 const char *export_path, struct vfsmount *mnt_target)
2584{
2585 struct mnt_namespace *ns_private;
2586 struct nameidata nd;
2587 struct super_block *s;
2588 int ret;
2589
2590 ns_private = create_mnt_ns(root_mnt);
2591 ret = PTR_ERR(ns_private);
2592 if (IS_ERR(ns_private))
2593 goto out_mntput;
2594
2595 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2596 export_path, LOOKUP_FOLLOW, &nd);
2597
2598 put_mnt_ns(ns_private);
2599
2600 if (ret != 0)
2601 goto out_err;
2602
2603 s = nd.path.mnt->mnt_sb;
2604 atomic_inc(&s->s_active);
2605 mnt_target->mnt_sb = s;
2606 mnt_target->mnt_root = dget(nd.path.dentry);
2607
b88f8a54
TM		 2608 /* Correct the device pathname */
2609 nfs_fix_devname(&nd.path, mnt_target);
2610
c02d7adf
TM		 2611 path_put(&nd.path);
2612 down_write(&s->s_umount);
2613 return 0;
2614out_mntput:
2615 mntput(root_mnt);
2616out_err:
2617 return ret;
2618}
2619
a6fe23be
CL		 2620static int nfs4_try_mount(int flags, const char *dev_name,
2621 struct nfs_parsed_mount_data *data,
2622 struct vfsmount *mnt)
2623{
2624 char *export_path;
2625 struct vfsmount *root_mnt;
2626 int error;
2627
2628 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2629
2630 export_path = data->nfs_server.export_path;
2631 data->nfs_server.export_path = "/";
2632 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2633 data->nfs_server.hostname);
2634 data->nfs_server.export_path = export_path;
2635
2636 error = PTR_ERR(root_mnt);
2637 if (IS_ERR(root_mnt))
2638 goto out;
2639
2640 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2641
2642out:
2643 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2644 error != 0 ? " [error]" : "");
2645 return error;
2646}
2647
c02d7adf
TM		 2648/*
2649 * Get the superblock for an NFS4 mountpoint
2650 */
2651static int nfs4_get_sb(struct file_system_type *fs_type,
2652 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2653{
2654 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2655 int error = -ENOMEM;
2656
c5811dbd 2657 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2658 if (data == NULL)
2659 goto out_free_data;
2660
2661 /* Validate the mount data */
2662 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2663 if (error < 0)
2664 goto out;
2665
a6fe23be 2666 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2667
2668out:
2669 kfree(data->client_address);
2670 kfree(data->nfs_server.export_path);
2671 kfree(data->nfs_server.hostname);
2672 kfree(data->fscache_uniq);
2673out_free_data:
2674 kfree(data);
2675 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2676 error != 0 ? " [error]" : "");
2677 return error;
2678}
2679
f7b422b1
DH		 2680static void nfs4_kill_super(struct super_block *sb)
2681{
2682 struct nfs_server *server = NFS_SB(sb);
2683
0f3e66c6 2684 dprintk("--> %s\n", __func__);
515d8611 2685 nfs_super_return_all_delegations(sb);
f7b422b1 2686 kill_anon_super(sb);
08734048 2687 nfs_fscache_release_super_cookie(sb);
54ceac45 2688 nfs_free_server(server);
0f3e66c6 2689 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2690}
2691
2692/*
54ceac45 2693 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2694 */
54ceac45
DH		 2695static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2696 const char *dev_name, void *raw_data,
2697 struct vfsmount *mnt)
f7b422b1 2698{
54ceac45
DH		 2699 struct nfs_clone_mount *data = raw_data;
2700 struct super_block *s;
2701 struct nfs_server *server;
2702 struct dentry *mntroot;
75180df2 2703 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2704 struct nfs_sb_mountdata sb_mntdata = {
2705 .mntflags = flags,
2706 };
54ceac45 2707 int error;
f7b422b1 2708
54ceac45 2709 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2710
54ceac45
DH		 2711 /* create a new volume representation */
2712 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2713 if (IS_ERR(server)) {
2714 error = PTR_ERR(server);
2715 goto out_err_noserver;
f7b422b1 2716 }
e89a5a43 2717 sb_mntdata.server = server;
f7b422b1 2718
75180df2
TM		 2719 if (server->flags & NFS4_MOUNT_UNSHARED)
2720 compare_super = NULL;
2721
54ceac45 2722 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2723 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2724 if (IS_ERR(s)) {
2725 error = PTR_ERR(s);
2726 goto out_err_nosb;
f7b422b1 2727 }
f7b422b1 2728
54ceac45
DH		 2729 if (s->s_fs_info != server) {
2730 nfs_free_server(server);
2731 server = NULL;
fa799759
MS		 2732 } else {
2733 error = nfs_bdi_register(server);
2734 if (error)
2735 goto error_splat_super;
54ceac45 2736 }
f7b422b1 2737
54ceac45
DH		 2738 if (!s->s_root) {
2739 /* initial superblock/root creation */
54ceac45 2740 nfs4_clone_super(s, data->sb);
2df54806 2741 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2742 }
f7b422b1 2743
54ceac45
DH		 2744 mntroot = nfs4_get_root(s, data->fh);
2745 if (IS_ERR(mntroot)) {
2746 error = PTR_ERR(mntroot);
2747 goto error_splat_super;
2748 }
e9cc6c23
TM		 2749 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2750 dput(mntroot);
2751 error = -ESTALE;
2752 goto error_splat_super;
2753 }
f7b422b1 2754
54ceac45
DH		 2755 s->s_flags |= MS_ACTIVE;
2756 mnt->mnt_sb = s;
2757 mnt->mnt_root = mntroot;
2758
46c8ac74
EP		 2759 security_sb_clone_mnt_opts(data->sb, s);
2760
54ceac45
DH		 2761 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2762 return 0;
2763
2764out_err_nosb:
2765 nfs_free_server(server);
2766out_err_noserver:
2767 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2768 return error;
2769
2770error_splat_super:
6f5bbff9 2771 deactivate_locked_super(s);
54ceac45
DH		 2772 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2773 return error;
f7b422b1
DH		 2774}
2775
c02d7adf
TM		 2776static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2777 int flags, const char *dev_name, void *raw_data,
2778 struct vfsmount *mnt)
f7b422b1
DH		 2779{
2780 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2781 struct super_block *s;
2782 struct nfs_server *server;
2783 struct dentry *mntroot;
2784 struct nfs_fh mntfh;
75180df2 2785 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2786 struct nfs_sb_mountdata sb_mntdata = {
2787 .mntflags = flags,
2788 };
54ceac45
DH		 2789 int error;
2790
2791 dprintk("--> nfs4_referral_get_sb()\n");
2792
2793 /* create a new volume representation */
2794 server = nfs4_create_referral_server(data, &mntfh);
2795 if (IS_ERR(server)) {
2796 error = PTR_ERR(server);
2797 goto out_err_noserver;
2798 }
e89a5a43 2799 sb_mntdata.server = server;
54ceac45 2800
75180df2
TM		 2801 if (server->flags & NFS4_MOUNT_UNSHARED)
2802 compare_super = NULL;
2803
54ceac45 2804 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2805 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2806 if (IS_ERR(s)) {
2807 error = PTR_ERR(s);
2808 goto out_err_nosb;
2809 }
2810
2811 if (s->s_fs_info != server) {
2812 nfs_free_server(server);
2813 server = NULL;
fa799759
MS		 2814 } else {
2815 error = nfs_bdi_register(server);
2816 if (error)
2817 goto error_splat_super;
54ceac45
DH		 2818 }
2819
2820 if (!s->s_root) {
2821 /* initial superblock/root creation */
54ceac45 2822 nfs4_fill_super(s);
2df54806 2823 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 2824 }
2825
f2d0d85e 2826 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2827 if (IS_ERR(mntroot)) {
2828 error = PTR_ERR(mntroot);
2829 goto error_splat_super;
2830 }
e9cc6c23
TM		 2831 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2832 dput(mntroot);
2833 error = -ESTALE;
2834 goto error_splat_super;
2835 }
54ceac45
DH		 2836
2837 s->s_flags |= MS_ACTIVE;
2838 mnt->mnt_sb = s;
2839 mnt->mnt_root = mntroot;
2840
46c8ac74
EP		 2841 security_sb_clone_mnt_opts(data->sb, s);
2842
54ceac45
DH		 2843 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2844 return 0;
2845
2846out_err_nosb:
2847 nfs_free_server(server);
2848out_err_noserver:
2849 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2850 return error;
2851
2852error_splat_super:
6f5bbff9 2853 deactivate_locked_super(s);
54ceac45
DH		 2854 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2855 return error;
f7b422b1
DH		 2856}
2857
c02d7adf
TM		 2858/*
2859 * Create an NFS4 server record on referral traversal
2860 */
2861static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2862 int flags, const char *dev_name, void *raw_data,
2863 struct vfsmount *mnt)
2864{
2865 struct nfs_clone_mount *data = raw_data;
2866 char *export_path;
2867 struct vfsmount *root_mnt;
2868 int error;
2869
2870 dprintk("--> nfs4_referral_get_sb()\n");
2871
2872 export_path = data->mnt_path;
2873 data->mnt_path = "/";
2874
2875 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2876 flags, data, data->hostname);
2877 data->mnt_path = export_path;
2878
2879 error = PTR_ERR(root_mnt);
2880 if (IS_ERR(root_mnt))
2881 goto out;
2882
2883 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2884out:
2885 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2886 error != 0 ? " [error]" : "");
2887 return error;
2888}
2889
54ceac45 2890#endif /* CONFIG_NFS_V4 */
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