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Merge branch 'writeback' of git://git.kernel.dk/linux-2.6-block
[linux-block.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
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
AIB		 717 lock_kernel();
718
719 server = NFS_SB(sb);
fc6ae3cf
TM		 720 /* -EIO all pending I/O */
721 rpc = server->client_acl;
722 if (!IS_ERR(rpc))
723 rpc_killall_tasks(rpc);
724 rpc = server->client;
725 if (!IS_ERR(rpc))
726 rpc_killall_tasks(rpc);
67e55205
AIB		 727
728 unlock_kernel();
f7b422b1
DH		 729}
730
9423a08a
CL		 731static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(int flags)
732{
733 struct nfs_parsed_mount_data *data;
734
735 data = kzalloc(sizeof(*data), GFP_KERNEL);
736 if (data) {
737 data->flags = flags;
738 data->rsize = NFS_MAX_FILE_IO_SIZE;
739 data->wsize = NFS_MAX_FILE_IO_SIZE;
740 data->acregmin = NFS_DEF_ACREGMIN;
741 data->acregmax = NFS_DEF_ACREGMAX;
742 data->acdirmin = NFS_DEF_ACDIRMIN;
743 data->acdirmax = NFS_DEF_ACDIRMAX;
744 data->nfs_server.port = NFS_UNSPEC_PORT;
745 data->auth_flavors[0] = RPC_AUTH_UNIX;
746 data->auth_flavor_len = 1;
747 data->minorversion = 0;
748 }
749 return data;
750}
751
fc50d58f 752/*
cdcd7f9a
CL		 753 * Sanity-check a server address provided by the mount command.
754 *
755 * Address family must be initialized, and address must not be
756 * the ANY address for that family.
fc50d58f
CL		 757 */
758static int nfs_verify_server_address(struct sockaddr *addr)
759{
760 switch (addr->sa_family) {
761 case AF_INET: {
cdcd7f9a 762 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 763 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 764 }
765 case AF_INET6: {
766 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
767 return !ipv6_addr_any(sa);
fc50d58f
CL		 768 }
769 }
770
53a0b9c4 771 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 772 return 0;
773}
774
4cfd74fc
CL		 775/*
776 * Select between a default port value and a user-specified port value.
777 * If a zero value is set, then autobind will be used.
778 */
779static void nfs_set_default_port(struct sockaddr *sap, const int parsed_port,
780 const unsigned short default_port)
781{
782 unsigned short port = default_port;
783
784 if (parsed_port != NFS_UNSPEC_PORT)
785 port = parsed_port;
786
787 rpc_set_port(sap, port);
788}
789
259875ef
TM		 790/*
791 * Sanity check the NFS transport protocol.
792 *
793 */
794static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
795{
796 switch (mnt->nfs_server.protocol) {
797 case XPRT_TRANSPORT_UDP:
798 case XPRT_TRANSPORT_TCP:
799 case XPRT_TRANSPORT_RDMA:
800 break;
801 default:
802 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
803 }
804}
805
806/*
807 * For text based NFSv2/v3 mounts, the mount protocol transport default
808 * settings should depend upon the specified NFS transport.
809 */
810static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
811{
812 nfs_validate_transport_protocol(mnt);
813
814 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
815 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
816 return;
817 switch (mnt->nfs_server.protocol) {
818 case XPRT_TRANSPORT_UDP:
819 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
820 break;
821 case XPRT_TRANSPORT_TCP:
822 case XPRT_TRANSPORT_RDMA:
823 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
824 }
825}
826
01060c89
CL		 827/*
828 * Parse the value of the 'sec=' option.
01060c89
CL		 829 */
830static int nfs_parse_security_flavors(char *value,
831 struct nfs_parsed_mount_data *mnt)
832{
833 substring_t args[MAX_OPT_ARGS];
834
835 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
836
837 switch (match_token(value, nfs_secflavor_tokens, args)) {
838 case Opt_sec_none:
01060c89
CL		 839 mnt->auth_flavors[0] = RPC_AUTH_NULL;
840 break;
841 case Opt_sec_sys:
01060c89
CL		 842 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
843 break;
844 case Opt_sec_krb5:
01060c89
CL		 845 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
846 break;
847 case Opt_sec_krb5i:
01060c89
CL		 848 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
849 break;
850 case Opt_sec_krb5p:
01060c89
CL		 851 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
852 break;
853 case Opt_sec_lkey:
01060c89
CL		 854 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
855 break;
856 case Opt_sec_lkeyi:
01060c89
CL		 857 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
858 break;
859 case Opt_sec_lkeyp:
01060c89
CL		 860 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
861 break;
862 case Opt_sec_spkm:
01060c89
CL		 863 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
864 break;
865 case Opt_sec_spkmi:
01060c89
CL		 866 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
867 break;
868 case Opt_sec_spkmp:
01060c89
CL		 869 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
870 break;
871 default:
872 return 0;
873 }
874
059f90b3 875 mnt->auth_flavor_len = 1;
01060c89
CL		 876 return 1;
877}
878
bf0fd768
CL		 879/*
880 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 881 * a data structure. The whole mount string is processed; bad options are
882 * skipped as they are encountered. If there were no errors, return 1;
883 * otherwise return 0 (zero).
bf0fd768
CL		 884 */
885static int nfs_parse_mount_options(char *raw,
886 struct nfs_parsed_mount_data *mnt)
887{
f9c3a380 888 char *p, *string, *secdata;
d23c45fd 889 int rc, sloppy = 0, invalid_option = 0;
bf0fd768
CL		 890
891 if (!raw) {
892 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
893 return 1;
894 }
895 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
896
f9c3a380
EP		 897 secdata = alloc_secdata();
898 if (!secdata)
899 goto out_nomem;
900
901 rc = security_sb_copy_data(raw, secdata);
902 if (rc)
903 goto out_security_failure;
904
905 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
906 if (rc)
907 goto out_security_failure;
908
909 free_secdata(secdata);
910
bf0fd768
CL		 911 while ((p = strsep(&raw, ",")) != NULL) {
912 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 913 unsigned long option;
914 int token;
bf0fd768
CL		 915
916 if (!*p)
917 continue;
918
919 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
920
921 token = match_token(p, nfs_mount_option_tokens, args);
922 switch (token) {
f45663ce
CL		 923
924 /*
925 * boolean options: foo/nofoo
926 */
bf0fd768
CL		 927 case Opt_soft:
928 mnt->flags |= NFS_MOUNT_SOFT;
929 break;
930 case Opt_hard:
931 mnt->flags &= ~NFS_MOUNT_SOFT;
932 break;
bf0fd768
CL		 933 case Opt_posix:
934 mnt->flags |= NFS_MOUNT_POSIX;
935 break;
936 case Opt_noposix:
937 mnt->flags &= ~NFS_MOUNT_POSIX;
938 break;
939 case Opt_cto:
940 mnt->flags &= ~NFS_MOUNT_NOCTO;
941 break;
942 case Opt_nocto:
943 mnt->flags |= NFS_MOUNT_NOCTO;
944 break;
945 case Opt_ac:
946 mnt->flags &= ~NFS_MOUNT_NOAC;
947 break;
948 case Opt_noac:
949 mnt->flags |= NFS_MOUNT_NOAC;
950 break;
951 case Opt_lock:
952 mnt->flags &= ~NFS_MOUNT_NONLM;
953 break;
954 case Opt_nolock:
955 mnt->flags |= NFS_MOUNT_NONLM;
956 break;
957 case Opt_v2:
958 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 959 mnt->version = 2;
bf0fd768
CL		 960 break;
961 case Opt_v3:
962 mnt->flags |= NFS_MOUNT_VER3;
764302cc 963 mnt->version = 3;
bf0fd768 964 break;
764302cc
CL		 965#ifdef CONFIG_NFS_V4
966 case Opt_v4:
967 mnt->flags &= ~NFS_MOUNT_VER3;
968 mnt->version = 4;
969 break;
970#endif
bf0fd768
CL		 971 case Opt_udp:
972 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 973 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 974 break;
975 case Opt_tcp:
976 mnt->flags |= NFS_MOUNT_TCP;
0896a725 977 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 978 break;
2cf7ff7a
TT		 979 case Opt_rdma:
980 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
981 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 982 xprt_load_transport(p);
2cf7ff7a 983 break;
bf0fd768
CL		 984 case Opt_acl:
985 mnt->flags &= ~NFS_MOUNT_NOACL;
986 break;
987 case Opt_noacl:
988 mnt->flags |= NFS_MOUNT_NOACL;
989 break;
990 case Opt_rdirplus:
991 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
992 break;
993 case Opt_nordirplus:
994 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
995 break;
75180df2
TM		 996 case Opt_sharecache:
997 mnt->flags &= ~NFS_MOUNT_UNSHARED;
998 break;
999 case Opt_nosharecache:
1000 mnt->flags |= NFS_MOUNT_UNSHARED;
1001 break;
d740351b
CL		 1002 case Opt_resvport:
1003 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1004 break;
1005 case Opt_noresvport:
1006 mnt->flags |= NFS_MOUNT_NORESVPORT;
1007 break;
b797cac7
DH		 1008 case Opt_fscache:
1009 mnt->options |= NFS_OPTION_FSCACHE;
1010 kfree(mnt->fscache_uniq);
1011 mnt->fscache_uniq = NULL;
1012 break;
1013 case Opt_nofscache:
1014 mnt->options &= ~NFS_OPTION_FSCACHE;
1015 kfree(mnt->fscache_uniq);
1016 mnt->fscache_uniq = NULL;
1017 break;
1018 case Opt_fscache_uniq:
1019 string = match_strdup(args);
1020 if (!string)
1021 goto out_nomem;
1022 kfree(mnt->fscache_uniq);
1023 mnt->fscache_uniq = string;
1024 mnt->options |= NFS_OPTION_FSCACHE;
1025 break;
bf0fd768 1026
f45663ce
CL		 1027 /*
1028 * options that take numeric values
1029 */
bf0fd768 1030 case Opt_port:
a5a16bae
CL		 1031 string = match_strdup(args);
1032 if (string == NULL)
1033 goto out_nomem;
1034 rc = strict_strtoul(string, 10, &option);
1035 kfree(string);
1036 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1037 goto out_invalid_value;
1038 mnt->nfs_server.port = option;
bf0fd768
CL		 1039 break;
1040 case Opt_rsize:
a5a16bae
CL		 1041 string = match_strdup(args);
1042 if (string == NULL)
1043 goto out_nomem;
1044 rc = strict_strtoul(string, 10, &option);
1045 kfree(string);
1046 if (rc != 0)
d23c45fd
CL		 1047 goto out_invalid_value;
1048 mnt->rsize = option;
bf0fd768
CL		 1049 break;
1050 case Opt_wsize:
a5a16bae
CL		 1051 string = match_strdup(args);
1052 if (string == NULL)
1053 goto out_nomem;
1054 rc = strict_strtoul(string, 10, &option);
1055 kfree(string);
1056 if (rc != 0)
d23c45fd
CL		 1057 goto out_invalid_value;
1058 mnt->wsize = option;
bf0fd768
CL		 1059 break;
1060 case Opt_bsize:
a5a16bae
CL		 1061 string = match_strdup(args);
1062 if (string == NULL)
1063 goto out_nomem;
1064 rc = strict_strtoul(string, 10, &option);
1065 kfree(string);
1066 if (rc != 0)
d23c45fd
CL		 1067 goto out_invalid_value;
1068 mnt->bsize = option;
bf0fd768
CL		 1069 break;
1070 case Opt_timeo:
a5a16bae
CL		 1071 string = match_strdup(args);
1072 if (string == NULL)
1073 goto out_nomem;
1074 rc = strict_strtoul(string, 10, &option);
1075 kfree(string);
1076 if (rc != 0 || option == 0)
d23c45fd
CL		 1077 goto out_invalid_value;
1078 mnt->timeo = option;
bf0fd768
CL		 1079 break;
1080 case Opt_retrans:
a5a16bae
CL		 1081 string = match_strdup(args);
1082 if (string == NULL)
1083 goto out_nomem;
1084 rc = strict_strtoul(string, 10, &option);
1085 kfree(string);
1086 if (rc != 0 || option == 0)
d23c45fd
CL		 1087 goto out_invalid_value;
1088 mnt->retrans = option;
bf0fd768
CL		 1089 break;
1090 case Opt_acregmin:
a5a16bae
CL		 1091 string = match_strdup(args);
1092 if (string == NULL)
1093 goto out_nomem;
1094 rc = strict_strtoul(string, 10, &option);
1095 kfree(string);
1096 if (rc != 0)
d23c45fd
CL		 1097 goto out_invalid_value;
1098 mnt->acregmin = option;
bf0fd768
CL		 1099 break;
1100 case Opt_acregmax:
a5a16bae
CL		 1101 string = match_strdup(args);
1102 if (string == NULL)
1103 goto out_nomem;
1104 rc = strict_strtoul(string, 10, &option);
1105 kfree(string);
1106 if (rc != 0)
d23c45fd
CL		 1107 goto out_invalid_value;
1108 mnt->acregmax = option;
bf0fd768
CL		 1109 break;
1110 case Opt_acdirmin:
a5a16bae
CL		 1111 string = match_strdup(args);
1112 if (string == NULL)
1113 goto out_nomem;
1114 rc = strict_strtoul(string, 10, &option);
1115 kfree(string);
1116 if (rc != 0)
d23c45fd
CL		 1117 goto out_invalid_value;
1118 mnt->acdirmin = option;
bf0fd768
CL		 1119 break;
1120 case Opt_acdirmax:
a5a16bae
CL		 1121 string = match_strdup(args);
1122 if (string == NULL)
1123 goto out_nomem;
1124 rc = strict_strtoul(string, 10, &option);
1125 kfree(string);
1126 if (rc != 0)
d23c45fd
CL		 1127 goto out_invalid_value;
1128 mnt->acdirmax = option;
bf0fd768
CL		 1129 break;
1130 case Opt_actimeo:
a5a16bae
CL		 1131 string = match_strdup(args);
1132 if (string == NULL)
1133 goto out_nomem;
1134 rc = strict_strtoul(string, 10, &option);
1135 kfree(string);
1136 if (rc != 0)
d23c45fd
CL		 1137 goto out_invalid_value;
1138 mnt->acregmin = mnt->acregmax =
1139 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1140 break;
1141 case Opt_namelen:
a5a16bae
CL		 1142 string = match_strdup(args);
1143 if (string == NULL)
1144 goto out_nomem;
1145 rc = strict_strtoul(string, 10, &option);
1146 kfree(string);
1147 if (rc != 0)
d23c45fd
CL		 1148 goto out_invalid_value;
1149 mnt->namlen = option;
bf0fd768
CL		 1150 break;
1151 case Opt_mountport:
a5a16bae
CL		 1152 string = match_strdup(args);
1153 if (string == NULL)
1154 goto out_nomem;
1155 rc = strict_strtoul(string, 10, &option);
1156 kfree(string);
1157 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1158 goto out_invalid_value;
1159 mnt->mount_server.port = option;
bf0fd768 1160 break;
bf0fd768 1161 case Opt_mountvers:
a5a16bae
CL		 1162 string = match_strdup(args);
1163 if (string == NULL)
1164 goto out_nomem;
1165 rc = strict_strtoul(string, 10, &option);
1166 kfree(string);
1167 if (rc != 0 ||
f45663ce 1168 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1169 option > NFS_MNT3_VERSION)
1170 goto out_invalid_value;
1171 mnt->mount_server.version = option;
bf0fd768 1172 break;
bf0fd768 1173 case Opt_nfsvers:
a5a16bae
CL		 1174 string = match_strdup(args);
1175 if (string == NULL)
1176 goto out_nomem;
1177 rc = strict_strtoul(string, 10, &option);
1178 kfree(string);
1179 if (rc != 0)
d23c45fd 1180 goto out_invalid_value;
bf0fd768 1181 switch (option) {
f45663ce 1182 case NFS2_VERSION:
bf0fd768 1183 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1184 mnt->version = 2;
bf0fd768 1185 break;
f45663ce 1186 case NFS3_VERSION:
bf0fd768 1187 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1188 mnt->version = 3;
1189 break;
1190#ifdef CONFIG_NFS_V4
1191 case NFS4_VERSION:
1192 mnt->flags &= ~NFS_MOUNT_VER3;
1193 mnt->version = 4;
bf0fd768 1194 break;
764302cc 1195#endif
bf0fd768 1196 default:
d23c45fd 1197 goto out_invalid_value;
bf0fd768
CL		 1198 }
1199 break;
3fd5be9e 1200 case Opt_minorversion:
f3f4f4ed
CL		 1201 string = match_strdup(args);
1202 if (string == NULL)
1203 goto out_nomem;
1204 rc = strict_strtoul(string, 10, &option);
1205 kfree(string);
1206 if (rc != 0)
1207 goto out_invalid_value;
1208 if (option > NFS4_MAX_MINOR_VERSION)
1209 goto out_invalid_value;
1210 mnt->minorversion = option;
3fd5be9e 1211 break;
bf0fd768 1212
f45663ce
CL		 1213 /*
1214 * options that take text values
1215 */
bf0fd768
CL		 1216 case Opt_sec:
1217 string = match_strdup(args);
1218 if (string == NULL)
1219 goto out_nomem;
01060c89 1220 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1221 kfree(string);
f45663ce 1222 if (!rc) {
f45663ce
CL		 1223 dfprintk(MOUNT, "NFS: unrecognized "
1224 "security flavor\n");
d23c45fd 1225 return 0;
f45663ce 1226 }
bf0fd768
CL		 1227 break;
1228 case Opt_proto:
1229 string = match_strdup(args);
1230 if (string == NULL)
1231 goto out_nomem;
1232 token = match_token(string,
1233 nfs_xprt_protocol_tokens, args);
bf0fd768
CL		 1234
1235 switch (token) {
fdb66ff4 1236 case Opt_xprt_udp:
bf0fd768 1237 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1238 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1239 kfree(string);
bf0fd768 1240 break;
fdb66ff4 1241 case Opt_xprt_tcp:
bf0fd768 1242 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1243 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1244 kfree(string);
bf0fd768 1245 break;
2cf7ff7a
TT		 1246 case Opt_xprt_rdma:
1247 /* vector side protocols to TCP */
1248 mnt->flags |= NFS_MOUNT_TCP;
1249 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1250 xprt_load_transport(string);
d23c45fd 1251 kfree(string);
2cf7ff7a 1252 break;
bf0fd768 1253 default:
f45663ce
CL		 1254 dfprintk(MOUNT, "NFS: unrecognized "
1255 "transport protocol\n");
d23c45fd 1256 return 0;
bf0fd768
CL		 1257 }
1258 break;
1259 case Opt_mountproto:
1260 string = match_strdup(args);
1261 if (string == NULL)
1262 goto out_nomem;
1263 token = match_token(string,
1264 nfs_xprt_protocol_tokens, args);
d508afb4 1265 kfree(string);
bf0fd768
CL		 1266
1267 switch (token) {
fdb66ff4 1268 case Opt_xprt_udp:
0896a725 1269 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1270 break;
fdb66ff4 1271 case Opt_xprt_tcp:
0896a725 1272 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1273 break;
2cf7ff7a 1274 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1275 default:
f45663ce
CL		 1276 dfprintk(MOUNT, "NFS: unrecognized "
1277 "transport protocol\n");
d23c45fd 1278 return 0;
bf0fd768
CL		 1279 }
1280 break;
1281 case Opt_addr:
1282 string = match_strdup(args);
1283 if (string == NULL)
1284 goto out_nomem;
53a0b9c4
CL		 1285 mnt->nfs_server.addrlen =
1286 rpc_pton(string, strlen(string),
1287 (struct sockaddr *)
1288 &mnt->nfs_server.address,
1289 sizeof(mnt->nfs_server.address));
bf0fd768 1290 kfree(string);
53a0b9c4
CL		 1291 if (mnt->nfs_server.addrlen == 0)
1292 goto out_invalid_address;
bf0fd768
CL		 1293 break;
1294 case Opt_clientaddr:
1295 string = match_strdup(args);
1296 if (string == NULL)
1297 goto out_nomem;
fc601477 1298 kfree(mnt->client_address);
bf0fd768
CL		 1299 mnt->client_address = string;
1300 break;
33832034
CL		 1301 case Opt_mounthost:
1302 string = match_strdup(args);
1303 if (string == NULL)
1304 goto out_nomem;
fc601477 1305 kfree(mnt->mount_server.hostname);
33832034
CL		 1306 mnt->mount_server.hostname = string;
1307 break;
0ac83779 1308 case Opt_mountaddr:
bf0fd768
CL		 1309 string = match_strdup(args);
1310 if (string == NULL)
1311 goto out_nomem;
53a0b9c4
CL		 1312 mnt->mount_server.addrlen =
1313 rpc_pton(string, strlen(string),
1314 (struct sockaddr *)
1315 &mnt->mount_server.address,
1316 sizeof(mnt->mount_server.address));
bf0fd768 1317 kfree(string);
53a0b9c4
CL		 1318 if (mnt->mount_server.addrlen == 0)
1319 goto out_invalid_address;
bf0fd768 1320 break;
7973c1f1
TM		 1321 case Opt_lookupcache:
1322 string = match_strdup(args);
1323 if (string == NULL)
1324 goto out_nomem;
1325 token = match_token(string,
1326 nfs_lookupcache_tokens, args);
1327 kfree(string);
1328 switch (token) {
1329 case Opt_lookupcache_all:
1330 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1331 break;
1332 case Opt_lookupcache_positive:
1333 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1334 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1335 break;
1336 case Opt_lookupcache_none:
1337 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1338 break;
1339 default:
7973c1f1
TM		 1340 dfprintk(MOUNT, "NFS: invalid "
1341 "lookupcache argument\n");
d23c45fd 1342 return 0;
7973c1f1
TM		 1343 };
1344 break;
bf0fd768 1345
f45663ce
CL		 1346 /*
1347 * Special options
1348 */
1349 case Opt_sloppy:
1350 sloppy = 1;
1351 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1352 break;
bf0fd768
CL		 1353 case Opt_userspace:
1354 case Opt_deprecated:
d33e4dfe
CL		 1355 dfprintk(MOUNT, "NFS: ignoring mount option "
1356 "'%s'\n", p);
bf0fd768
CL		 1357 break;
1358
1359 default:
d23c45fd 1360 invalid_option = 1;
f45663ce
CL		 1361 dfprintk(MOUNT, "NFS: unrecognized mount option "
1362 "'%s'\n", p);
bf0fd768
CL		 1363 }
1364 }
1365
d23c45fd
CL		 1366 if (!sloppy && invalid_option)
1367 return 0;
1368
bf0fd768
CL		 1369 return 1;
1370
53a0b9c4
CL		 1371out_invalid_address:
1372 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1373 return 0;
d23c45fd 1374out_invalid_value:
53a0b9c4 1375 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1376 return 0;
bf0fd768
CL		 1377out_nomem:
1378 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1379 return 0;
f9c3a380
EP		 1380out_security_failure:
1381 free_secdata(secdata);
1382 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1383 return 0;
bf0fd768
CL		 1384}
1385
ec88f28d
CL		 1386/*
1387 * Match the requested auth flavors with the list returned by
1388 * the server. Returns zero and sets the mount's authentication
1389 * flavor on success; returns -EACCES if server does not support
1390 * the requested flavor.
1391 */
1392static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1393 struct nfs_mount_request *request)
1394{
1395 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1396
5eecfde6
CL		 1397 /*
1398 * Certain releases of Linux's mountd return an empty
1399 * flavor list. To prevent behavioral regression with
1400 * these servers (ie. rejecting mounts that used to
1401 * succeed), revert to pre-2.6.32 behavior (no checking)
1402 * if the returned flavor list is empty.
1403 */
1404 if (server_authlist_len == 0)
1405 return 0;
1406
ec88f28d
CL		 1407 /*
1408 * We avoid sophisticated negotiating here, as there are
1409 * plenty of cases where we can get it wrong, providing
1410 * either too little or too much security.
1411 *
1412 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1413 * flavor listed first. However, some servers list
1414 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1415 * preferred default, in args->auth_flavors[0] if user
1416 * didn't specify sec= mount option.
1417 */
1418 for (i = 0; i < args->auth_flavor_len; i++)
1419 for (j = 0; j < server_authlist_len; j++)
1420 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1421 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1422 request->auth_flavs[j]);
1423 args->auth_flavors[0] = request->auth_flavs[j];
1424 return 0;
1425 }
1426
1427 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1428 nfs_umount(request);
1429 return -EACCES;
1430}
1431
0076d7b7
CL		 1432/*
1433 * Use the remote server's MOUNT service to request the NFS file handle
1434 * corresponding to the provided path.
1435 */
1436static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1437 struct nfs_fh *root_fh)
1438{
ec88f28d
CL		 1439 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1440 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1441 struct nfs_mount_request request = {
1442 .sap = (struct sockaddr *)
1443 &args->mount_server.address,
1444 .dirpath = args->nfs_server.export_path,
1445 .protocol = args->mount_server.protocol,
1446 .fh = root_fh,
50a737f8 1447 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1448 .auth_flav_len = &server_authlist_len,
1449 .auth_flavs = server_authlist,
c5d120f8 1450 };
4c568017 1451 int status;
0076d7b7
CL		 1452
1453 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1454 switch (args->version) {
1455 default:
1456 args->mount_server.version = NFS_MNT3_VERSION;
1457 break;
1458 case 2:
1459 args->mount_server.version = NFS_MNT_VERSION;
1460 }
0076d7b7 1461 }
c5d120f8 1462 request.version = args->mount_server.version;
0076d7b7 1463
33832034 1464 if (args->mount_server.hostname)
c5d120f8 1465 request.hostname = args->mount_server.hostname;
33832034 1466 else
c5d120f8 1467 request.hostname = args->nfs_server.hostname;
33832034 1468
0076d7b7
CL		 1469 /*
1470 * Construct the mount server's address.
1471 */
4c568017 1472 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1473 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1474 args->nfs_server.addrlen);
1475 args->mount_server.addrlen = args->nfs_server.addrlen;
1476 }
c5d120f8 1477 request.salen = args->mount_server.addrlen;
4cfd74fc 1478 nfs_set_default_port(request.sap, args->mount_server.port, 0);
0076d7b7
CL		 1479
1480 /*
1481 * Now ask the mount server to map our export path
1482 * to a file handle.
1483 */
c5d120f8 1484 status = nfs_mount(&request);
ec88f28d
CL		 1485 if (status != 0) {
1486 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1487 request.hostname, status);
1488 return status;
1489 }
0076d7b7 1490
ec88f28d
CL		 1491 /*
1492 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1493 */
1494 if (args->mount_server.version != NFS_MNT3_VERSION)
1495 return 0;
1496 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1497}
1498
d1aa0825
CL		 1499static int nfs_parse_simple_hostname(const char *dev_name,
1500 char **hostname, size_t maxnamlen,
1501 char **export_path, size_t maxpathlen)
dc045898
CL		 1502{
1503 size_t len;
1504 char *colon, *comma;
1505
1506 colon = strchr(dev_name, ':');
1507 if (colon == NULL)
1508 goto out_bad_devname;
1509
1510 len = colon - dev_name;
1511 if (len > maxnamlen)
1512 goto out_hostname;
1513
1514 /* N.B. caller will free nfs_server.hostname in all cases */
1515 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1516 if (!*hostname)
1517 goto out_nomem;
1518
1519 /* kill possible hostname list: not supported */
1520 comma = strchr(*hostname, ',');
1521 if (comma != NULL) {
1522 if (comma == *hostname)
1523 goto out_bad_devname;
1524 *comma = '\0';
1525 }
1526
1527 colon++;
1528 len = strlen(colon);
1529 if (len > maxpathlen)
1530 goto out_path;
1531 *export_path = kstrndup(colon, len, GFP_KERNEL);
1532 if (!*export_path)
1533 goto out_nomem;
1534
1535 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1536 return 0;
1537
1538out_bad_devname:
1539 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1540 return -EINVAL;
1541
1542out_nomem:
1543 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1544 return -ENOMEM;
1545
1546out_hostname:
1547 dfprintk(MOUNT, "NFS: server hostname too long\n");
1548 return -ENAMETOOLONG;
1549
1550out_path:
1551 dfprintk(MOUNT, "NFS: export pathname too long\n");
1552 return -ENAMETOOLONG;
1553}
1554
d1aa0825
CL		 1555/*
1556 * Hostname has square brackets around it because it contains one or
1557 * more colons. We look for the first closing square bracket, and a
1558 * colon must follow it.
1559 */
1560static int nfs_parse_protected_hostname(const char *dev_name,
1561 char **hostname, size_t maxnamlen,
1562 char **export_path, size_t maxpathlen)
1563{
1564 size_t len;
1565 char *start, *end;
1566
1567 start = (char *)(dev_name + 1);
1568
1569 end = strchr(start, ']');
1570 if (end == NULL)
1571 goto out_bad_devname;
1572 if (*(end + 1) != ':')
1573 goto out_bad_devname;
1574
1575 len = end - start;
1576 if (len > maxnamlen)
1577 goto out_hostname;
1578
1579 /* N.B. caller will free nfs_server.hostname in all cases */
1580 *hostname = kstrndup(start, len, GFP_KERNEL);
1581 if (*hostname == NULL)
1582 goto out_nomem;
1583
1584 end += 2;
1585 len = strlen(end);
1586 if (len > maxpathlen)
1587 goto out_path;
1588 *export_path = kstrndup(end, len, GFP_KERNEL);
1589 if (!*export_path)
1590 goto out_nomem;
1591
1592 return 0;
1593
1594out_bad_devname:
1595 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1596 return -EINVAL;
1597
1598out_nomem:
1599 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1600 return -ENOMEM;
1601
1602out_hostname:
1603 dfprintk(MOUNT, "NFS: server hostname too long\n");
1604 return -ENAMETOOLONG;
1605
1606out_path:
1607 dfprintk(MOUNT, "NFS: export pathname too long\n");
1608 return -ENAMETOOLONG;
1609}
1610
1611/*
1612 * Split "dev_name" into "hostname:export_path".
1613 *
1614 * The leftmost colon demarks the split between the server's hostname
1615 * and the export path. If the hostname starts with a left square
1616 * bracket, then it may contain colons.
1617 *
1618 * Note: caller frees hostname and export path, even on error.
1619 */
1620static int nfs_parse_devname(const char *dev_name,
1621 char **hostname, size_t maxnamlen,
1622 char **export_path, size_t maxpathlen)
1623{
1624 if (*dev_name == '[')
1625 return nfs_parse_protected_hostname(dev_name,
1626 hostname, maxnamlen,
1627 export_path, maxpathlen);
1628
1629 return nfs_parse_simple_hostname(dev_name,
1630 hostname, maxnamlen,
1631 export_path, maxpathlen);
1632}
1633
f7b422b1 1634/*
54ceac45
DH		 1635 * Validate the NFS2/NFS3 mount data
1636 * - fills in the mount root filehandle
136d558c
CL		 1637 *
1638 * For option strings, user space handles the following behaviors:
1639 *
1640 * + DNS: mapping server host name to IP address ("addr=" option)
1641 *
1642 * + failure mode: how to behave if a mount request can't be handled
1643 * immediately ("fg/bg" option)
1644 *
1645 * + retry: how often to retry a mount request ("retry=" option)
1646 *
1647 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1648 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1649 */
2283f8d6
TT		 1650static int nfs_validate_mount_data(void *options,
1651 struct nfs_parsed_mount_data *args,
136d558c
CL		 1652 struct nfs_fh *mntfh,
1653 const char *dev_name)
f7b422b1 1654{
2283f8d6 1655 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1656 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1657
5df36e78
CL		 1658 if (data == NULL)
1659 goto out_no_data;
f7b422b1 1660
54ceac45 1661 switch (data->version) {
5df36e78
CL		 1662 case 1:
1663 data->namlen = 0;
1664 case 2:
1665 data->bsize = 0;
1666 case 3:
1667 if (data->flags & NFS_MOUNT_VER3)
1668 goto out_no_v3;
1669 data->root.size = NFS2_FHSIZE;
1670 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1671 case 4:
1672 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1673 goto out_no_sec;
1674 case 5:
1675 memset(data->context, 0, sizeof(data->context));
1676 case 6:
b7e24457
TM		 1677 if (data->flags & NFS_MOUNT_VER3) {
1678 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1679 goto out_invalid_fh;
5df36e78 1680 mntfh->size = data->root.size;
764302cc
CL		 1681 args->version = 3;
1682 } else {
5df36e78 1683 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1684 args->version = 2;
1685 }
5df36e78 1686
5df36e78
CL		 1687
1688 memcpy(mntfh->data, data->root.data, mntfh->size);
1689 if (mntfh->size < sizeof(mntfh->data))
1690 memset(mntfh->data + mntfh->size, 0,
1691 sizeof(mntfh->data) - mntfh->size);
6e88e061 1692
2283f8d6
TT		 1693 /*
1694 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1695 * can deal with.
1696 */
ff3525a5 1697 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1698 args->rsize = data->rsize;
1699 args->wsize = data->wsize;
2283f8d6
TT		 1700 args->timeo = data->timeo;
1701 args->retrans = data->retrans;
1702 args->acregmin = data->acregmin;
1703 args->acregmax = data->acregmax;
1704 args->acdirmin = data->acdirmin;
1705 args->acdirmax = data->acdirmax;
4c568017 1706
4cfd74fc 1707 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1708 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1709 if (!nfs_verify_server_address(sap))
4c568017
CL		 1710 goto out_no_address;
1711
2283f8d6 1712 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1713 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
36dd2fdb
AV		 1714 else
1715 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
2283f8d6
TT		 1716 /* N.B. caller will free nfs_server.hostname in all cases */
1717 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1718 args->namlen = data->namlen;
1719 args->bsize = data->bsize;
dd07c947
CL		 1720
1721 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1722 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1723 if (!args->nfs_server.hostname)
1724 goto out_nomem;
f9c3a380
EP		 1725
1726 /*
1727 * The legacy version 6 binary mount data from userspace has a
1728 * field used only to transport selinux information into the
1729 * the kernel. To continue to support that functionality we
1730 * have a touch of selinux knowledge here in the NFS code. The
1731 * userspace code converted context=blah to just blah so we are
1732 * converting back to the full string selinux understands.
1733 */
1734 if (data->context[0]){
1735#ifdef CONFIG_SECURITY_SELINUX
1736 int rc;
1737 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1738 if (!opts_str)
1739 return -ENOMEM;
1740 strcpy(opts_str, "context=");
1741 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1742 strcat(opts_str, &data->context[0]);
1743 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1744 kfree(opts_str);
1745 if (rc)
1746 return rc;
1747#else
1748 return -EINVAL;
1749#endif
1750 }
1751
5df36e78 1752 break;
136d558c 1753 default: {
136d558c 1754 int status;
136d558c 1755
2283f8d6
TT		 1756 if (nfs_parse_mount_options((char *)options, args) == 0)
1757 return -EINVAL;
136d558c 1758
4cfd74fc 1759 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1760 goto out_no_address;
1761
764302cc
CL		 1762 if (args->version == 4)
1763#ifdef CONFIG_NFS_V4
1764 return nfs4_validate_text_mount_data(options,
1765 args, dev_name);
1766#else
1767 goto out_v4_not_compiled;
1768#endif
1769
4cfd74fc 1770 nfs_set_default_port(sap, args->nfs_server.port, 0);
ed596a8a 1771
259875ef
TM		 1772 nfs_set_mount_transport_protocol(args);
1773
dc045898
CL		 1774 status = nfs_parse_devname(dev_name,
1775 &args->nfs_server.hostname,
1776 PAGE_SIZE,
1777 &args->nfs_server.export_path,
1778 NFS_MAXPATHLEN);
1779 if (!status)
1780 status = nfs_try_mount(args, mntfh);
136d558c 1781
dc045898
CL		 1782 kfree(args->nfs_server.export_path);
1783 args->nfs_server.export_path = NULL;
136d558c 1784
136d558c 1785 if (status)
fdc6e2c8 1786 return status;
136d558c 1787
136d558c
CL		 1788 break;
1789 }
f7b422b1 1790 }
54ceac45
DH		 1791
1792#ifndef CONFIG_NFS_V3
8a6e5deb 1793 if (args->version == 3)
5df36e78
CL		 1794 goto out_v3_not_compiled;
1795#endif /* !CONFIG_NFS_V3 */
f7b422b1 1796
5df36e78 1797 return 0;
f7b422b1 1798
5df36e78
CL		 1799out_no_data:
1800 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1801 return -EINVAL;
54ceac45 1802
5df36e78
CL		 1803out_no_v3:
1804 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1805 data->version);
1806 return -EINVAL;
f7b422b1 1807
5df36e78
CL		 1808out_no_sec:
1809 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1810 return -EINVAL;
1811
5df36e78
CL		 1812#ifndef CONFIG_NFS_V3
1813out_v3_not_compiled:
1814 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1815 return -EPROTONOSUPPORT;
1816#endif /* !CONFIG_NFS_V3 */
1817
764302cc
CL		 1818#ifndef CONFIG_NFS_V4
1819out_v4_not_compiled:
1820 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1821 return -EPROTONOSUPPORT;
1822#endif /* !CONFIG_NFS_V4 */
1823
63649bd7
CG		 1824out_nomem:
1825 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1826 return -ENOMEM;
1827
5df36e78
CL		 1828out_no_address:
1829 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1830 return -EINVAL;
1831
1832out_invalid_fh:
1833 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1834 return -EINVAL;
f7b422b1
DH		 1835}
1836
48b605f8
JL		 1837static int
1838nfs_compare_remount_data(struct nfs_server *nfss,
1839 struct nfs_parsed_mount_data *data)
1840{
1841 if (data->flags != nfss->flags ||
1842 data->rsize != nfss->rsize ||
1843 data->wsize != nfss->wsize ||
1844 data->retrans != nfss->client->cl_timeout->to_retries ||
1845 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1846 data->acregmin != nfss->acregmin / HZ ||
1847 data->acregmax != nfss->acregmax / HZ ||
1848 data->acdirmin != nfss->acdirmin / HZ ||
1849 data->acdirmax != nfss->acdirmax / HZ ||
1850 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1851 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1852 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1853 data->nfs_server.addrlen) != 0)
1854 return -EINVAL;
1855
1856 return 0;
1857}
1858
1859static int
1860nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1861{
1862 int error;
1863 struct nfs_server *nfss = sb->s_fs_info;
1864 struct nfs_parsed_mount_data *data;
1865 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1866 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1867 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1868
1869 /*
1870 * Userspace mount programs that send binary options generally send
1871 * them populated with default values. We have no way to know which
1872 * ones were explicitly specified. Fall back to legacy behavior and
1873 * just return success.
1874 */
31c94469
MZ		 1875 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1876 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1877 options->version <= 6))))
48b605f8
JL		 1878 return 0;
1879
1880 data = kzalloc(sizeof(*data), GFP_KERNEL);
1881 if (data == NULL)
1882 return -ENOMEM;
1883
337eb00a 1884 lock_kernel();
48b605f8
JL		 1885 /* fill out struct with values from existing mount */
1886 data->flags = nfss->flags;
1887 data->rsize = nfss->rsize;
1888 data->wsize = nfss->wsize;
1889 data->retrans = nfss->client->cl_timeout->to_retries;
1890 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1891 data->acregmin = nfss->acregmin / HZ;
1892 data->acregmax = nfss->acregmax / HZ;
1893 data->acdirmin = nfss->acdirmin / HZ;
1894 data->acdirmax = nfss->acdirmax / HZ;
1895 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1896 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1897 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1898 data->nfs_server.addrlen);
1899
1900 /* overwrite those values with any that were specified */
1901 error = nfs_parse_mount_options((char *)options, data);
1902 if (error < 0)
1903 goto out;
1904
1905 /* compare new mount options with old ones */
1906 error = nfs_compare_remount_data(nfss, data);
1907out:
1908 kfree(data);
337eb00a 1909 unlock_kernel();
48b605f8
JL		 1910 return error;
1911}
1912
f7b422b1 1913/*
54ceac45 1914 * Initialise the common bits of the superblock
f7b422b1 1915 */
54ceac45 1916static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1917{
54ceac45 1918 struct nfs_server *server = NFS_SB(sb);
5006a76c 1919
54ceac45 1920 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1921
54ceac45
DH		 1922 /* We probably want something more informative here */
1923 snprintf(sb->s_id, sizeof(sb->s_id),
1924 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1925
54ceac45
DH		 1926 if (sb->s_blocksize == 0)
1927 sb->s_blocksize = nfs_block_bits(server->wsize,
1928 &sb->s_blocksize_bits);
f7b422b1 1929
54ceac45
DH		 1930 if (server->flags & NFS_MOUNT_NOAC)
1931 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1932
32a88aa1
JA		 1933 sb->s_bdi = &server->backing_dev_info;
1934
54ceac45 1935 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1936}
1937
1938/*
54ceac45 1939 * Finish setting up an NFS2/3 superblock
f7b422b1 1940 */
2283f8d6
TT		 1941static void nfs_fill_super(struct super_block *sb,
1942 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1943{
1944 struct nfs_server *server = NFS_SB(sb);
5006a76c 1945
54ceac45
DH		 1946 sb->s_blocksize_bits = 0;
1947 sb->s_blocksize = 0;
1948 if (data->bsize)
1949 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1950
8a6e5deb 1951 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 1952 /* The VFS shouldn't apply the umask to mode bits. We will do
1953 * so ourselves when necessary.
1954 */
1955 sb->s_flags |= MS_POSIXACL;
1956 sb->s_time_gran = 1;
816724e6 1957 }
54ceac45
DH		 1958
1959 sb->s_op = &nfs_sops;
1960 nfs_initialise_sb(sb);
f7b422b1
DH		 1961}
1962
1963/*
54ceac45 1964 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1965 */
54ceac45
DH		 1966static void nfs_clone_super(struct super_block *sb,
1967 const struct super_block *old_sb)
f7b422b1 1968{
54ceac45
DH		 1969 struct nfs_server *server = NFS_SB(sb);
1970
1971 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1972 sb->s_blocksize = old_sb->s_blocksize;
1973 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1974
8a6e5deb 1975 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 1976 /* The VFS shouldn't apply the umask to mode bits. We will do
1977 * so ourselves when necessary.
f7b422b1
DH		 1978 */
1979 sb->s_flags |= MS_POSIXACL;
f7b422b1 1980 sb->s_time_gran = 1;
f7b422b1
DH		 1981 }
1982
54ceac45
DH		 1983 sb->s_op = old_sb->s_op;
1984 nfs_initialise_sb(sb);
f7b422b1
DH		 1985}
1986
275a5d24
TM		 1987static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1988{
1989 const struct nfs_server *a = s->s_fs_info;
1990 const struct rpc_clnt *clnt_a = a->client;
1991 const struct rpc_clnt *clnt_b = b->client;
1992
1993 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1994 goto Ebusy;
1995 if (a->nfs_client != b->nfs_client)
1996 goto Ebusy;
1997 if (a->flags != b->flags)
1998 goto Ebusy;
1999 if (a->wsize != b->wsize)
2000 goto Ebusy;
2001 if (a->rsize != b->rsize)
2002 goto Ebusy;
2003 if (a->acregmin != b->acregmin)
2004 goto Ebusy;
2005 if (a->acregmax != b->acregmax)
2006 goto Ebusy;
2007 if (a->acdirmin != b->acdirmin)
2008 goto Ebusy;
2009 if (a->acdirmax != b->acdirmax)
2010 goto Ebusy;
2011 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2012 goto Ebusy;
e89a5a43 2013 return 1;
275a5d24 2014Ebusy:
e89a5a43
TM		 2015 return 0;
2016}
2017
2018struct nfs_sb_mountdata {
2019 struct nfs_server *server;
2020 int mntflags;
2021};
2022
2023static int nfs_set_super(struct super_block *s, void *data)
2024{
2025 struct nfs_sb_mountdata *sb_mntdata = data;
2026 struct nfs_server *server = sb_mntdata->server;
2027 int ret;
2028
2029 s->s_flags = sb_mntdata->mntflags;
2030 s->s_fs_info = server;
2031 ret = set_anon_super(s, server);
2032 if (ret == 0)
2033 server->s_dev = s->s_dev;
2034 return ret;
2035}
2036
fd00a8ff
CL		 2037static int nfs_compare_super_address(struct nfs_server *server1,
2038 struct nfs_server *server2)
2039{
2040 struct sockaddr *sap1, *sap2;
2041
2042 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2043 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2044
2045 if (sap1->sa_family != sap2->sa_family)
2046 return 0;
2047
2048 switch (sap1->sa_family) {
2049 case AF_INET: {
2050 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2051 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2052 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2053 return 0;
2054 if (sin1->sin_port != sin2->sin_port)
2055 return 0;
2056 break;
2057 }
2058 case AF_INET6: {
2059 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2060 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2061 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2062 return 0;
2063 if (sin1->sin6_port != sin2->sin6_port)
2064 return 0;
2065 break;
2066 }
2067 default:
2068 return 0;
2069 }
2070
2071 return 1;
2072}
2073
e89a5a43
TM		 2074static int nfs_compare_super(struct super_block *sb, void *data)
2075{
2076 struct nfs_sb_mountdata *sb_mntdata = data;
2077 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2078 int mntflags = sb_mntdata->mntflags;
2079
fd00a8ff 2080 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2081 return 0;
2082 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2083 if (old->flags & NFS_MOUNT_UNSHARED)
2084 return 0;
2085 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2086 return 0;
2087 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2088}
2089
fa799759
MS		 2090static int nfs_bdi_register(struct nfs_server *server)
2091{
2092 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2093}
2094
816724e6
TM		 2095static int nfs_get_sb(struct file_system_type *fs_type,
2096 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2097{
f7b422b1
DH		 2098 struct nfs_server *server = NULL;
2099 struct super_block *s;
33852a1f
TM		 2100 struct nfs_parsed_mount_data *data;
2101 struct nfs_fh *mntfh;
54ceac45 2102 struct dentry *mntroot;
75180df2 2103 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2104 struct nfs_sb_mountdata sb_mntdata = {
2105 .mntflags = flags,
2106 };
33852a1f
TM		 2107 int error = -ENOMEM;
2108
9423a08a 2109 data = nfs_alloc_parsed_mount_data(NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
33852a1f
TM		 2110 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2111 if (data == NULL || mntfh == NULL)
2112 goto out_free_fh;
f7b422b1 2113
33852a1f 2114 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2115
54ceac45 2116 /* Validate the mount data */
33852a1f 2117 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2118 if (error < 0)
0655960f 2119 goto out;
f7b422b1 2120
764302cc
CL		 2121#ifdef CONFIG_NFS_V4
2122 if (data->version == 4) {
2123 error = nfs4_try_mount(flags, dev_name, data, mnt);
2124 kfree(data->client_address);
2125 goto out;
2126 }
2127#endif /* CONFIG_NFS_V4 */
2128
54ceac45 2129 /* Get a volume representation */
33852a1f 2130 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2131 if (IS_ERR(server)) {
2132 error = PTR_ERR(server);
0655960f 2133 goto out;
f7b422b1 2134 }
e89a5a43 2135 sb_mntdata.server = server;
f7b422b1 2136
75180df2
TM		 2137 if (server->flags & NFS_MOUNT_UNSHARED)
2138 compare_super = NULL;
2139
54ceac45 2140 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2141 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2142 if (IS_ERR(s)) {
2143 error = PTR_ERR(s);
54ceac45 2144 goto out_err_nosb;
816724e6
TM		 2145 }
2146
54ceac45
DH		 2147 if (s->s_fs_info != server) {
2148 nfs_free_server(server);
2149 server = NULL;
fa799759
MS		 2150 } else {
2151 error = nfs_bdi_register(server);
2152 if (error)
2153 goto error_splat_super;
54ceac45 2154 }
f7b422b1 2155
54ceac45
DH		 2156 if (!s->s_root) {
2157 /* initial superblock/root creation */
33852a1f 2158 nfs_fill_super(s, data);
2df54806
DH		 2159 nfs_fscache_get_super_cookie(
2160 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2161 }
f7b422b1 2162
33852a1f 2163 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2164 if (IS_ERR(mntroot)) {
2165 error = PTR_ERR(mntroot);
2166 goto error_splat_super;
f7b422b1 2167 }
816724e6 2168
33852a1f 2169 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2170 if (error)
2171 goto error_splat_root;
2172
54ceac45
DH		 2173 s->s_flags |= MS_ACTIVE;
2174 mnt->mnt_sb = s;
2175 mnt->mnt_root = mntroot;
0655960f
CL		 2176 error = 0;
2177
2178out:
33852a1f
TM		 2179 kfree(data->nfs_server.hostname);
2180 kfree(data->mount_server.hostname);
08734048 2181 kfree(data->fscache_uniq);
33852a1f
TM		 2182 security_free_mnt_opts(&data->lsm_opts);
2183out_free_fh:
2184 kfree(mntfh);
2185 kfree(data);
0655960f 2186 return error;
816724e6 2187
54ceac45
DH		 2188out_err_nosb:
2189 nfs_free_server(server);
0655960f 2190 goto out;
54ceac45 2191
f9c3a380
EP		 2192error_splat_root:
2193 dput(mntroot);
54ceac45 2194error_splat_super:
6f5bbff9 2195 deactivate_locked_super(s);
0655960f 2196 goto out;
f7b422b1
DH		 2197}
2198
54ceac45
DH		 2199/*
2200 * Destroy an NFS2/3 superblock
2201 */
f7b422b1
DH		 2202static void nfs_kill_super(struct super_block *s)
2203{
2204 struct nfs_server *server = NFS_SB(s);
2205
2206 kill_anon_super(s);
92f25053 2207 bdi_unregister(&server->backing_dev_info);
08734048 2208 nfs_fscache_release_super_cookie(s);
54ceac45 2209 nfs_free_server(server);
f7b422b1
DH		 2210}
2211
54ceac45
DH		 2212/*
2213 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2214 */
2215static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2216 const char *dev_name, void *raw_data,
2217 struct vfsmount *mnt)
f7b422b1
DH		 2218{
2219 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2220 struct super_block *s;
2221 struct nfs_server *server;
2222 struct dentry *mntroot;
75180df2 2223 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2224 struct nfs_sb_mountdata sb_mntdata = {
2225 .mntflags = flags,
2226 };
54ceac45 2227 int error;
f7b422b1 2228
54ceac45 2229 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2230
54ceac45
DH		 2231 /* create a new volume representation */
2232 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2233 if (IS_ERR(server)) {
2234 error = PTR_ERR(server);
2235 goto out_err_noserver;
2236 }
e89a5a43 2237 sb_mntdata.server = server;
8fa5c000 2238
75180df2
TM		 2239 if (server->flags & NFS_MOUNT_UNSHARED)
2240 compare_super = NULL;
2241
54ceac45 2242 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2243 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2244 if (IS_ERR(s)) {
2245 error = PTR_ERR(s);
2246 goto out_err_nosb;
2247 }
5006a76c 2248
54ceac45
DH		 2249 if (s->s_fs_info != server) {
2250 nfs_free_server(server);
2251 server = NULL;
fa799759
MS		 2252 } else {
2253 error = nfs_bdi_register(server);
2254 if (error)
2255 goto error_splat_super;
f7b422b1 2256 }
24c8dbbb 2257
54ceac45
DH		 2258 if (!s->s_root) {
2259 /* initial superblock/root creation */
54ceac45 2260 nfs_clone_super(s, data->sb);
2df54806 2261 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2262 }
f7b422b1 2263
54ceac45
DH		 2264 mntroot = nfs_get_root(s, data->fh);
2265 if (IS_ERR(mntroot)) {
2266 error = PTR_ERR(mntroot);
2267 goto error_splat_super;
f7b422b1 2268 }
e9cc6c23 2269 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2270 dput(mntroot);
2271 error = -ESTALE;
2272 goto error_splat_super;
2273 }
f7b422b1 2274
54ceac45
DH		 2275 s->s_flags |= MS_ACTIVE;
2276 mnt->mnt_sb = s;
2277 mnt->mnt_root = mntroot;
f7b422b1 2278
f9c3a380
EP		 2279 /* clone any lsm security options from the parent to the new sb */
2280 security_sb_clone_mnt_opts(data->sb, s);
2281
54ceac45
DH		 2282 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2283 return 0;
24c8dbbb 2284
54ceac45
DH		 2285out_err_nosb:
2286 nfs_free_server(server);
2287out_err_noserver:
2288 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2289 return error;
f7b422b1 2290
54ceac45 2291error_splat_super:
6f5bbff9 2292 deactivate_locked_super(s);
54ceac45
DH		 2293 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2294 return error;
f7b422b1
DH		 2295}
2296
54ceac45
DH		 2297#ifdef CONFIG_NFS_V4
2298
f7b422b1 2299/*
54ceac45 2300 * Finish setting up a cloned NFS4 superblock
f7b422b1 2301 */
54ceac45
DH		 2302static void nfs4_clone_super(struct super_block *sb,
2303 const struct super_block *old_sb)
f7b422b1 2304{
54ceac45
DH		 2305 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2306 sb->s_blocksize = old_sb->s_blocksize;
2307 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2308 sb->s_time_gran = 1;
54ceac45
DH		 2309 sb->s_op = old_sb->s_op;
2310 nfs_initialise_sb(sb);
f7b422b1
DH		 2311}
2312
54ceac45
DH		 2313/*
2314 * Set up an NFS4 superblock
2315 */
2316static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2317{
54ceac45
DH		 2318 sb->s_time_gran = 1;
2319 sb->s_op = &nfs4_sops;
2320 nfs_initialise_sb(sb);
f7b422b1
DH		 2321}
2322
01c3f052
TM		 2323static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2324{
2325 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2326}
2327
7630c852
CL		 2328static int nfs4_validate_text_mount_data(void *options,
2329 struct nfs_parsed_mount_data *args,
2330 const char *dev_name)
2331{
2332 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2333
2334 nfs_set_default_port(sap, args->nfs_server.port, NFS_PORT);
2335
2336 nfs_validate_transport_protocol(args);
2337
2338 nfs4_validate_mount_flags(args);
2339
2ecda72b
TM		 2340 if (args->version != 4) {
2341 dfprintk(MOUNT,
2342 "NFS4: Illegal mount version\n");
2343 return -EINVAL;
2344 }
2345
7630c852
CL		 2346 if (args->auth_flavor_len > 1) {
2347 dfprintk(MOUNT,
2348 "NFS4: Too many RPC auth flavours specified\n");
2349 return -EINVAL;
2350 }
2351
2352 if (args->client_address == NULL) {
2353 dfprintk(MOUNT,
2354 "NFS4: mount program didn't pass callback address\n");
2355 return -EINVAL;
2356 }
2357
2358 return nfs_parse_devname(dev_name,
2359 &args->nfs_server.hostname,
2360 NFS4_MAXNAMLEN,
2361 &args->nfs_server.export_path,
2362 NFS4_MAXPATHLEN);
2363}
2364
f0768ebd
CL		 2365/*
2366 * Validate NFSv4 mount options
2367 */
91ea40b9
TT		 2368static int nfs4_validate_mount_data(void *options,
2369 struct nfs_parsed_mount_data *args,
2370 const char *dev_name)
f0768ebd 2371{
4cfd74fc 2372 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2373 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2374 char *c;
2375
2376 if (data == NULL)
2377 goto out_no_data;
2378
764302cc 2379 args->version = 4;
f0768ebd
CL		 2380 switch (data->version) {
2381 case 1:
4c568017
CL		 2382 if (data->host_addrlen > sizeof(args->nfs_server.address))
2383 goto out_no_address;
2384 if (data->host_addrlen == 0)
f0768ebd 2385 goto out_no_address;
4c568017 2386 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2387 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2388 return -EFAULT;
4cfd74fc 2389 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2390 goto out_no_address;
2391
6738b251
CL		 2392 if (data->auth_flavourlen) {
2393 if (data->auth_flavourlen > 1)
2394 goto out_inval_auth;
20c71f5e 2395 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2396 data->auth_flavours,
20c71f5e 2397 sizeof(args->auth_flavors[0])))
f0768ebd 2398 return -EFAULT;
f0768ebd
CL		 2399 }
2400
2401 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2402 if (IS_ERR(c))
2403 return PTR_ERR(c);
91ea40b9 2404 args->nfs_server.hostname = c;
f0768ebd
CL		 2405
2406 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2407 if (IS_ERR(c))
2408 return PTR_ERR(c);
91ea40b9
TT		 2409 args->nfs_server.export_path = c;
2410 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2411
2412 c = strndup_user(data->client_addr.data, 16);
2413 if (IS_ERR(c))
2414 return PTR_ERR(c);
91ea40b9
TT		 2415 args->client_address = c;
2416
2417 /*
2418 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2419 * can deal with.
2420 */
2421
2422 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2423 args->rsize = data->rsize;
2424 args->wsize = data->wsize;
2425 args->timeo = data->timeo;
2426 args->retrans = data->retrans;
2427 args->acregmin = data->acregmin;
2428 args->acregmax = data->acregmax;
2429 args->acdirmin = data->acdirmin;
2430 args->acdirmax = data->acdirmax;
2431 args->nfs_server.protocol = data->proto;
259875ef 2432 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2433
2434 break;
7630c852 2435 default:
91ea40b9 2436 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2437 return -EINVAL;
2438
4cfd74fc 2439 if (!nfs_verify_server_address(sap))
80071225 2440 return -EINVAL;
dc045898 2441
7630c852 2442 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2443 }
2444
2445 return 0;
2446
2447out_no_data:
2448 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2449 return -EINVAL;
2450
2451out_inval_auth:
2452 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2453 data->auth_flavourlen);
2454 return -EINVAL;
2455
2456out_no_address:
2457 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2458 return -EINVAL;
f0768ebd
CL		 2459}
2460
54ceac45 2461/*
c02d7adf 2462 * Get the superblock for the NFS4 root partition
54ceac45 2463 */
c02d7adf 2464static int nfs4_remote_get_sb(struct file_system_type *fs_type,
816724e6 2465 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2466{
c02d7adf 2467 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2468 struct super_block *s;
2469 struct nfs_server *server;
33852a1f 2470 struct nfs_fh *mntfh;
54ceac45 2471 struct dentry *mntroot;
75180df2 2472 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2473 struct nfs_sb_mountdata sb_mntdata = {
2474 .mntflags = flags,
2475 };
33852a1f
TM		 2476 int error = -ENOMEM;
2477
33852a1f
TM		 2478 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2479 if (data == NULL || mntfh == NULL)
2480 goto out_free_fh;
f7b422b1 2481
33852a1f 2482 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2483
54ceac45 2484 /* Get a volume representation */
33852a1f 2485 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2486 if (IS_ERR(server)) {
2487 error = PTR_ERR(server);
29eb981a 2488 goto out;
f7b422b1 2489 }
e89a5a43 2490 sb_mntdata.server = server;
f7b422b1 2491
75180df2
TM		 2492 if (server->flags & NFS4_MOUNT_UNSHARED)
2493 compare_super = NULL;
2494
54ceac45 2495 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2496 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2497 if (IS_ERR(s)) {
2498 error = PTR_ERR(s);
f7b422b1 2499 goto out_free;
816724e6
TM		 2500 }
2501
5dd3177a
TM		 2502 if (s->s_fs_info != server) {
2503 nfs_free_server(server);
2504 server = NULL;
fa799759
MS		 2505 } else {
2506 error = nfs_bdi_register(server);
2507 if (error)
2508 goto error_splat_super;
5dd3177a
TM		 2509 }
2510
54ceac45
DH		 2511 if (!s->s_root) {
2512 /* initial superblock/root creation */
54ceac45 2513 nfs4_fill_super(s);
2df54806
DH		 2514 nfs_fscache_get_super_cookie(
2515 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2516 }
f7b422b1 2517
33852a1f 2518 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2519 if (IS_ERR(mntroot)) {
2520 error = PTR_ERR(mntroot);
2521 goto error_splat_super;
f7b422b1 2522 }
54ceac45 2523
33852a1f 2524 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2525 if (error)
2526 goto error_splat_root;
2527
f7b422b1 2528 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2529 mnt->mnt_sb = s;
2530 mnt->mnt_root = mntroot;
29eb981a
CL		 2531 error = 0;
2532
2533out:
33852a1f
TM		 2534 security_free_mnt_opts(&data->lsm_opts);
2535out_free_fh:
2536 kfree(mntfh);
29eb981a 2537 return error;
54ceac45 2538
f7b422b1 2539out_free:
54ceac45 2540 nfs_free_server(server);
29eb981a 2541 goto out;
54ceac45 2542
46c8ac74
EP		 2543error_splat_root:
2544 dput(mntroot);
54ceac45 2545error_splat_super:
6f5bbff9 2546 deactivate_locked_super(s);
29eb981a 2547 goto out;
f7b422b1
DH		 2548}
2549
c02d7adf
TM		 2550static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2551 int flags, void *data, const char *hostname)
2552{
2553 struct vfsmount *root_mnt;
2554 char *root_devname;
2555 size_t len;
2556
2557 len = strlen(hostname) + 3;
2558 root_devname = kmalloc(len, GFP_KERNEL);
2559 if (root_devname == NULL)
2560 return ERR_PTR(-ENOMEM);
2561 snprintf(root_devname, len, "%s:/", hostname);
2562 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2563 kfree(root_devname);
2564 return root_mnt;
2565}
2566
b88f8a54
TM		 2567static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2568{
2569 char *page = (char *) __get_free_page(GFP_KERNEL);
2570 char *devname, *tmp;
2571
2572 if (page == NULL)
2573 return;
2574 devname = nfs_path(path->mnt->mnt_devname,
2575 path->mnt->mnt_root, path->dentry,
2576 page, PAGE_SIZE);
2577 if (devname == NULL)
2578 goto out_freepage;
2579 tmp = kstrdup(devname, GFP_KERNEL);
2580 if (tmp == NULL)
2581 goto out_freepage;
2582 kfree(mnt->mnt_devname);
2583 mnt->mnt_devname = tmp;
2584out_freepage:
2585 free_page((unsigned long)page);
2586}
2587
c02d7adf
TM		 2588static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2589 const char *export_path, struct vfsmount *mnt_target)
2590{
2591 struct mnt_namespace *ns_private;
2592 struct nameidata nd;
2593 struct super_block *s;
2594 int ret;
2595
2596 ns_private = create_mnt_ns(root_mnt);
2597 ret = PTR_ERR(ns_private);
2598 if (IS_ERR(ns_private))
2599 goto out_mntput;
2600
2601 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2602 export_path, LOOKUP_FOLLOW, &nd);
2603
2604 put_mnt_ns(ns_private);
2605
2606 if (ret != 0)
2607 goto out_err;
2608
2609 s = nd.path.mnt->mnt_sb;
2610 atomic_inc(&s->s_active);
2611 mnt_target->mnt_sb = s;
2612 mnt_target->mnt_root = dget(nd.path.dentry);
2613
b88f8a54
TM		 2614 /* Correct the device pathname */
2615 nfs_fix_devname(&nd.path, mnt_target);
2616
c02d7adf
TM		 2617 path_put(&nd.path);
2618 down_write(&s->s_umount);
2619 return 0;
2620out_mntput:
2621 mntput(root_mnt);
2622out_err:
2623 return ret;
2624}
2625
a6fe23be
CL		 2626static int nfs4_try_mount(int flags, const char *dev_name,
2627 struct nfs_parsed_mount_data *data,
2628 struct vfsmount *mnt)
2629{
2630 char *export_path;
2631 struct vfsmount *root_mnt;
2632 int error;
2633
2634 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2635
2636 export_path = data->nfs_server.export_path;
2637 data->nfs_server.export_path = "/";
2638 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2639 data->nfs_server.hostname);
2640 data->nfs_server.export_path = export_path;
2641
2642 error = PTR_ERR(root_mnt);
2643 if (IS_ERR(root_mnt))
2644 goto out;
2645
2646 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2647
2648out:
2649 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2650 error != 0 ? " [error]" : "");
2651 return error;
2652}
2653
c02d7adf
TM		 2654/*
2655 * Get the superblock for an NFS4 mountpoint
2656 */
2657static int nfs4_get_sb(struct file_system_type *fs_type,
2658 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2659{
2660 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2661 int error = -ENOMEM;
2662
9423a08a 2663 data = nfs_alloc_parsed_mount_data(0);
c02d7adf
TM		 2664 if (data == NULL)
2665 goto out_free_data;
2666
2667 /* Validate the mount data */
2668 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2669 if (error < 0)
2670 goto out;
2671
a6fe23be 2672 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2673
2674out:
2675 kfree(data->client_address);
2676 kfree(data->nfs_server.export_path);
2677 kfree(data->nfs_server.hostname);
2678 kfree(data->fscache_uniq);
2679out_free_data:
2680 kfree(data);
2681 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2682 error != 0 ? " [error]" : "");
2683 return error;
2684}
2685
f7b422b1
DH		 2686static void nfs4_kill_super(struct super_block *sb)
2687{
2688 struct nfs_server *server = NFS_SB(sb);
2689
0f3e66c6 2690 dprintk("--> %s\n", __func__);
515d8611 2691 nfs_super_return_all_delegations(sb);
f7b422b1 2692 kill_anon_super(sb);
f7b422b1 2693 nfs4_renewd_prepare_shutdown(server);
08734048 2694 nfs_fscache_release_super_cookie(sb);
54ceac45 2695 nfs_free_server(server);
0f3e66c6 2696 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2697}
2698
2699/*
54ceac45 2700 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2701 */
54ceac45
DH		 2702static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2703 const char *dev_name, void *raw_data,
2704 struct vfsmount *mnt)
f7b422b1 2705{
54ceac45
DH		 2706 struct nfs_clone_mount *data = raw_data;
2707 struct super_block *s;
2708 struct nfs_server *server;
2709 struct dentry *mntroot;
75180df2 2710 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2711 struct nfs_sb_mountdata sb_mntdata = {
2712 .mntflags = flags,
2713 };
54ceac45 2714 int error;
f7b422b1 2715
54ceac45 2716 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2717
54ceac45
DH		 2718 /* create a new volume representation */
2719 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2720 if (IS_ERR(server)) {
2721 error = PTR_ERR(server);
2722 goto out_err_noserver;
f7b422b1 2723 }
e89a5a43 2724 sb_mntdata.server = server;
f7b422b1 2725
75180df2
TM		 2726 if (server->flags & NFS4_MOUNT_UNSHARED)
2727 compare_super = NULL;
2728
54ceac45 2729 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2730 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2731 if (IS_ERR(s)) {
2732 error = PTR_ERR(s);
2733 goto out_err_nosb;
f7b422b1 2734 }
f7b422b1 2735
54ceac45
DH		 2736 if (s->s_fs_info != server) {
2737 nfs_free_server(server);
2738 server = NULL;
fa799759
MS		 2739 } else {
2740 error = nfs_bdi_register(server);
2741 if (error)
2742 goto error_splat_super;
54ceac45 2743 }
f7b422b1 2744
54ceac45
DH		 2745 if (!s->s_root) {
2746 /* initial superblock/root creation */
54ceac45 2747 nfs4_clone_super(s, data->sb);
2df54806 2748 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2749 }
f7b422b1 2750
54ceac45
DH		 2751 mntroot = nfs4_get_root(s, data->fh);
2752 if (IS_ERR(mntroot)) {
2753 error = PTR_ERR(mntroot);
2754 goto error_splat_super;
2755 }
e9cc6c23
TM		 2756 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2757 dput(mntroot);
2758 error = -ESTALE;
2759 goto error_splat_super;
2760 }
f7b422b1 2761
54ceac45
DH		 2762 s->s_flags |= MS_ACTIVE;
2763 mnt->mnt_sb = s;
2764 mnt->mnt_root = mntroot;
2765
46c8ac74
EP		 2766 security_sb_clone_mnt_opts(data->sb, s);
2767
54ceac45
DH		 2768 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2769 return 0;
2770
2771out_err_nosb:
2772 nfs_free_server(server);
2773out_err_noserver:
2774 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2775 return error;
2776
2777error_splat_super:
6f5bbff9 2778 deactivate_locked_super(s);
54ceac45
DH		 2779 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2780 return error;
f7b422b1
DH		 2781}
2782
c02d7adf
TM		 2783static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2784 int flags, const char *dev_name, void *raw_data,
2785 struct vfsmount *mnt)
f7b422b1
DH		 2786{
2787 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2788 struct super_block *s;
2789 struct nfs_server *server;
2790 struct dentry *mntroot;
2791 struct nfs_fh mntfh;
75180df2 2792 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2793 struct nfs_sb_mountdata sb_mntdata = {
2794 .mntflags = flags,
2795 };
54ceac45
DH		 2796 int error;
2797
2798 dprintk("--> nfs4_referral_get_sb()\n");
2799
2800 /* create a new volume representation */
2801 server = nfs4_create_referral_server(data, &mntfh);
2802 if (IS_ERR(server)) {
2803 error = PTR_ERR(server);
2804 goto out_err_noserver;
2805 }
e89a5a43 2806 sb_mntdata.server = server;
54ceac45 2807
75180df2
TM		 2808 if (server->flags & NFS4_MOUNT_UNSHARED)
2809 compare_super = NULL;
2810
54ceac45 2811 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2812 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2813 if (IS_ERR(s)) {
2814 error = PTR_ERR(s);
2815 goto out_err_nosb;
2816 }
2817
2818 if (s->s_fs_info != server) {
2819 nfs_free_server(server);
2820 server = NULL;
fa799759
MS		 2821 } else {
2822 error = nfs_bdi_register(server);
2823 if (error)
2824 goto error_splat_super;
54ceac45
DH		 2825 }
2826
2827 if (!s->s_root) {
2828 /* initial superblock/root creation */
54ceac45 2829 nfs4_fill_super(s);
2df54806 2830 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 2831 }
2832
f2d0d85e 2833 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2834 if (IS_ERR(mntroot)) {
2835 error = PTR_ERR(mntroot);
2836 goto error_splat_super;
2837 }
e9cc6c23
TM		 2838 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2839 dput(mntroot);
2840 error = -ESTALE;
2841 goto error_splat_super;
2842 }
54ceac45
DH		 2843
2844 s->s_flags |= MS_ACTIVE;
2845 mnt->mnt_sb = s;
2846 mnt->mnt_root = mntroot;
2847
46c8ac74
EP		 2848 security_sb_clone_mnt_opts(data->sb, s);
2849
54ceac45
DH		 2850 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2851 return 0;
2852
2853out_err_nosb:
2854 nfs_free_server(server);
2855out_err_noserver:
2856 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2857 return error;
2858
2859error_splat_super:
6f5bbff9 2860 deactivate_locked_super(s);
54ceac45
DH		 2861 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2862 return error;
f7b422b1
DH		 2863}
2864
c02d7adf
TM		 2865/*
2866 * Create an NFS4 server record on referral traversal
2867 */
2868static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2869 int flags, const char *dev_name, void *raw_data,
2870 struct vfsmount *mnt)
2871{
2872 struct nfs_clone_mount *data = raw_data;
2873 char *export_path;
2874 struct vfsmount *root_mnt;
2875 int error;
2876
2877 dprintk("--> nfs4_referral_get_sb()\n");
2878
2879 export_path = data->mnt_path;
2880 data->mnt_path = "/";
2881
2882 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2883 flags, data, data->hostname);
2884 data->mnt_path = export_path;
2885
2886 error = PTR_ERR(root_mnt);
2887 if (IS_ERR(root_mnt))
2888 goto out;
2889
2890 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2891out:
2892 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2893 error != 0 ? " [error]" : "");
2894 return error;
2895}
2896
54ceac45 2897#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)