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NFS: Allow the "nfs" file system type to support NFSv4
[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
fc50d58f 731/*
cdcd7f9a
CL		 732 * Sanity-check a server address provided by the mount command.
733 *
734 * Address family must be initialized, and address must not be
735 * the ANY address for that family.
fc50d58f
CL		 736 */
737static int nfs_verify_server_address(struct sockaddr *addr)
738{
739 switch (addr->sa_family) {
740 case AF_INET: {
cdcd7f9a 741 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 742 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 743 }
744 case AF_INET6: {
745 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
746 return !ipv6_addr_any(sa);
fc50d58f
CL		 747 }
748 }
749
53a0b9c4 750 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 751 return 0;
752}
753
4cfd74fc
CL		 754/*
755 * Select between a default port value and a user-specified port value.
756 * If a zero value is set, then autobind will be used.
757 */
758static void nfs_set_default_port(struct sockaddr *sap, const int parsed_port,
759 const unsigned short default_port)
760{
761 unsigned short port = default_port;
762
763 if (parsed_port != NFS_UNSPEC_PORT)
764 port = parsed_port;
765
766 rpc_set_port(sap, port);
767}
768
259875ef
TM		 769/*
770 * Sanity check the NFS transport protocol.
771 *
772 */
773static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
774{
775 switch (mnt->nfs_server.protocol) {
776 case XPRT_TRANSPORT_UDP:
777 case XPRT_TRANSPORT_TCP:
778 case XPRT_TRANSPORT_RDMA:
779 break;
780 default:
781 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
782 }
783}
784
785/*
786 * For text based NFSv2/v3 mounts, the mount protocol transport default
787 * settings should depend upon the specified NFS transport.
788 */
789static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
790{
791 nfs_validate_transport_protocol(mnt);
792
793 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
794 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
795 return;
796 switch (mnt->nfs_server.protocol) {
797 case XPRT_TRANSPORT_UDP:
798 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
799 break;
800 case XPRT_TRANSPORT_TCP:
801 case XPRT_TRANSPORT_RDMA:
802 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
803 }
804}
805
01060c89
CL		 806/*
807 * Parse the value of the 'sec=' option.
01060c89
CL		 808 */
809static int nfs_parse_security_flavors(char *value,
810 struct nfs_parsed_mount_data *mnt)
811{
812 substring_t args[MAX_OPT_ARGS];
813
814 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
815
816 switch (match_token(value, nfs_secflavor_tokens, args)) {
817 case Opt_sec_none:
01060c89
CL		 818 mnt->auth_flavors[0] = RPC_AUTH_NULL;
819 break;
820 case Opt_sec_sys:
01060c89
CL		 821 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
822 break;
823 case Opt_sec_krb5:
01060c89
CL		 824 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
825 break;
826 case Opt_sec_krb5i:
01060c89
CL		 827 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
828 break;
829 case Opt_sec_krb5p:
01060c89
CL		 830 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
831 break;
832 case Opt_sec_lkey:
01060c89
CL		 833 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
834 break;
835 case Opt_sec_lkeyi:
01060c89
CL		 836 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
837 break;
838 case Opt_sec_lkeyp:
01060c89
CL		 839 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
840 break;
841 case Opt_sec_spkm:
01060c89
CL		 842 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
843 break;
844 case Opt_sec_spkmi:
01060c89
CL		 845 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
846 break;
847 case Opt_sec_spkmp:
01060c89
CL		 848 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
849 break;
850 default:
851 return 0;
852 }
853
059f90b3 854 mnt->auth_flavor_len = 1;
01060c89
CL		 855 return 1;
856}
857
bf0fd768
CL		 858/*
859 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 860 * a data structure. The whole mount string is processed; bad options are
861 * skipped as they are encountered. If there were no errors, return 1;
862 * otherwise return 0 (zero).
bf0fd768
CL		 863 */
864static int nfs_parse_mount_options(char *raw,
865 struct nfs_parsed_mount_data *mnt)
866{
f9c3a380 867 char *p, *string, *secdata;
d23c45fd 868 int rc, sloppy = 0, invalid_option = 0;
bf0fd768
CL		 869
870 if (!raw) {
871 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
872 return 1;
873 }
874 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
875
f9c3a380
EP		 876 secdata = alloc_secdata();
877 if (!secdata)
878 goto out_nomem;
879
880 rc = security_sb_copy_data(raw, secdata);
881 if (rc)
882 goto out_security_failure;
883
884 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
885 if (rc)
886 goto out_security_failure;
887
888 free_secdata(secdata);
889
bf0fd768
CL		 890 while ((p = strsep(&raw, ",")) != NULL) {
891 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 892 unsigned long option;
893 int token;
bf0fd768
CL		 894
895 if (!*p)
896 continue;
897
898 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
899
900 token = match_token(p, nfs_mount_option_tokens, args);
901 switch (token) {
f45663ce
CL		 902
903 /*
904 * boolean options: foo/nofoo
905 */
bf0fd768
CL		 906 case Opt_soft:
907 mnt->flags |= NFS_MOUNT_SOFT;
908 break;
909 case Opt_hard:
910 mnt->flags &= ~NFS_MOUNT_SOFT;
911 break;
bf0fd768
CL		 912 case Opt_posix:
913 mnt->flags |= NFS_MOUNT_POSIX;
914 break;
915 case Opt_noposix:
916 mnt->flags &= ~NFS_MOUNT_POSIX;
917 break;
918 case Opt_cto:
919 mnt->flags &= ~NFS_MOUNT_NOCTO;
920 break;
921 case Opt_nocto:
922 mnt->flags |= NFS_MOUNT_NOCTO;
923 break;
924 case Opt_ac:
925 mnt->flags &= ~NFS_MOUNT_NOAC;
926 break;
927 case Opt_noac:
928 mnt->flags |= NFS_MOUNT_NOAC;
929 break;
930 case Opt_lock:
931 mnt->flags &= ~NFS_MOUNT_NONLM;
932 break;
933 case Opt_nolock:
934 mnt->flags |= NFS_MOUNT_NONLM;
935 break;
936 case Opt_v2:
937 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 938 mnt->version = 2;
bf0fd768
CL		 939 break;
940 case Opt_v3:
941 mnt->flags |= NFS_MOUNT_VER3;
764302cc 942 mnt->version = 3;
bf0fd768 943 break;
764302cc
CL		 944#ifdef CONFIG_NFS_V4
945 case Opt_v4:
946 mnt->flags &= ~NFS_MOUNT_VER3;
947 mnt->version = 4;
948 break;
949#endif
bf0fd768
CL		 950 case Opt_udp:
951 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 952 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 953 break;
954 case Opt_tcp:
955 mnt->flags |= NFS_MOUNT_TCP;
0896a725 956 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 957 break;
2cf7ff7a
TT		 958 case Opt_rdma:
959 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
960 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 961 xprt_load_transport(p);
2cf7ff7a 962 break;
bf0fd768
CL		 963 case Opt_acl:
964 mnt->flags &= ~NFS_MOUNT_NOACL;
965 break;
966 case Opt_noacl:
967 mnt->flags |= NFS_MOUNT_NOACL;
968 break;
969 case Opt_rdirplus:
970 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
971 break;
972 case Opt_nordirplus:
973 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
974 break;
75180df2
TM		 975 case Opt_sharecache:
976 mnt->flags &= ~NFS_MOUNT_UNSHARED;
977 break;
978 case Opt_nosharecache:
979 mnt->flags |= NFS_MOUNT_UNSHARED;
980 break;
d740351b
CL		 981 case Opt_resvport:
982 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
983 break;
984 case Opt_noresvport:
985 mnt->flags |= NFS_MOUNT_NORESVPORT;
986 break;
b797cac7
DH		 987 case Opt_fscache:
988 mnt->options |= NFS_OPTION_FSCACHE;
989 kfree(mnt->fscache_uniq);
990 mnt->fscache_uniq = NULL;
991 break;
992 case Opt_nofscache:
993 mnt->options &= ~NFS_OPTION_FSCACHE;
994 kfree(mnt->fscache_uniq);
995 mnt->fscache_uniq = NULL;
996 break;
997 case Opt_fscache_uniq:
998 string = match_strdup(args);
999 if (!string)
1000 goto out_nomem;
1001 kfree(mnt->fscache_uniq);
1002 mnt->fscache_uniq = string;
1003 mnt->options |= NFS_OPTION_FSCACHE;
1004 break;
bf0fd768 1005
f45663ce
CL		 1006 /*
1007 * options that take numeric values
1008 */
bf0fd768 1009 case Opt_port:
a5a16bae
CL		 1010 string = match_strdup(args);
1011 if (string == NULL)
1012 goto out_nomem;
1013 rc = strict_strtoul(string, 10, &option);
1014 kfree(string);
1015 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1016 goto out_invalid_value;
1017 mnt->nfs_server.port = option;
bf0fd768
CL		 1018 break;
1019 case Opt_rsize:
a5a16bae
CL		 1020 string = match_strdup(args);
1021 if (string == NULL)
1022 goto out_nomem;
1023 rc = strict_strtoul(string, 10, &option);
1024 kfree(string);
1025 if (rc != 0)
d23c45fd
CL		 1026 goto out_invalid_value;
1027 mnt->rsize = option;
bf0fd768
CL		 1028 break;
1029 case Opt_wsize:
a5a16bae
CL		 1030 string = match_strdup(args);
1031 if (string == NULL)
1032 goto out_nomem;
1033 rc = strict_strtoul(string, 10, &option);
1034 kfree(string);
1035 if (rc != 0)
d23c45fd
CL		 1036 goto out_invalid_value;
1037 mnt->wsize = option;
bf0fd768
CL		 1038 break;
1039 case Opt_bsize:
a5a16bae
CL		 1040 string = match_strdup(args);
1041 if (string == NULL)
1042 goto out_nomem;
1043 rc = strict_strtoul(string, 10, &option);
1044 kfree(string);
1045 if (rc != 0)
d23c45fd
CL		 1046 goto out_invalid_value;
1047 mnt->bsize = option;
bf0fd768
CL		 1048 break;
1049 case Opt_timeo:
a5a16bae
CL		 1050 string = match_strdup(args);
1051 if (string == NULL)
1052 goto out_nomem;
1053 rc = strict_strtoul(string, 10, &option);
1054 kfree(string);
1055 if (rc != 0 || option == 0)
d23c45fd
CL		 1056 goto out_invalid_value;
1057 mnt->timeo = option;
bf0fd768
CL		 1058 break;
1059 case Opt_retrans:
a5a16bae
CL		 1060 string = match_strdup(args);
1061 if (string == NULL)
1062 goto out_nomem;
1063 rc = strict_strtoul(string, 10, &option);
1064 kfree(string);
1065 if (rc != 0 || option == 0)
d23c45fd
CL		 1066 goto out_invalid_value;
1067 mnt->retrans = option;
bf0fd768
CL		 1068 break;
1069 case Opt_acregmin:
a5a16bae
CL		 1070 string = match_strdup(args);
1071 if (string == NULL)
1072 goto out_nomem;
1073 rc = strict_strtoul(string, 10, &option);
1074 kfree(string);
1075 if (rc != 0)
d23c45fd
CL		 1076 goto out_invalid_value;
1077 mnt->acregmin = option;
bf0fd768
CL		 1078 break;
1079 case Opt_acregmax:
a5a16bae
CL		 1080 string = match_strdup(args);
1081 if (string == NULL)
1082 goto out_nomem;
1083 rc = strict_strtoul(string, 10, &option);
1084 kfree(string);
1085 if (rc != 0)
d23c45fd
CL		 1086 goto out_invalid_value;
1087 mnt->acregmax = option;
bf0fd768
CL		 1088 break;
1089 case Opt_acdirmin:
a5a16bae
CL		 1090 string = match_strdup(args);
1091 if (string == NULL)
1092 goto out_nomem;
1093 rc = strict_strtoul(string, 10, &option);
1094 kfree(string);
1095 if (rc != 0)
d23c45fd
CL		 1096 goto out_invalid_value;
1097 mnt->acdirmin = option;
bf0fd768
CL		 1098 break;
1099 case Opt_acdirmax:
a5a16bae
CL		 1100 string = match_strdup(args);
1101 if (string == NULL)
1102 goto out_nomem;
1103 rc = strict_strtoul(string, 10, &option);
1104 kfree(string);
1105 if (rc != 0)
d23c45fd
CL		 1106 goto out_invalid_value;
1107 mnt->acdirmax = option;
bf0fd768
CL		 1108 break;
1109 case Opt_actimeo:
a5a16bae
CL		 1110 string = match_strdup(args);
1111 if (string == NULL)
1112 goto out_nomem;
1113 rc = strict_strtoul(string, 10, &option);
1114 kfree(string);
1115 if (rc != 0)
d23c45fd
CL		 1116 goto out_invalid_value;
1117 mnt->acregmin = mnt->acregmax =
1118 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1119 break;
1120 case Opt_namelen:
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->namlen = option;
bf0fd768
CL		 1129 break;
1130 case Opt_mountport:
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 || option > USHORT_MAX)
d23c45fd
CL		 1137 goto out_invalid_value;
1138 mnt->mount_server.port = option;
bf0fd768 1139 break;
bf0fd768 1140 case Opt_mountvers:
a5a16bae
CL		 1141 string = match_strdup(args);
1142 if (string == NULL)
1143 goto out_nomem;
1144 rc = strict_strtoul(string, 10, &option);
1145 kfree(string);
1146 if (rc != 0 ||
f45663ce 1147 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1148 option > NFS_MNT3_VERSION)
1149 goto out_invalid_value;
1150 mnt->mount_server.version = option;
bf0fd768 1151 break;
bf0fd768 1152 case Opt_nfsvers:
a5a16bae
CL		 1153 string = match_strdup(args);
1154 if (string == NULL)
1155 goto out_nomem;
1156 rc = strict_strtoul(string, 10, &option);
1157 kfree(string);
1158 if (rc != 0)
d23c45fd 1159 goto out_invalid_value;
bf0fd768 1160 switch (option) {
f45663ce 1161 case NFS2_VERSION:
bf0fd768 1162 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1163 mnt->version = 2;
bf0fd768 1164 break;
f45663ce 1165 case NFS3_VERSION:
bf0fd768 1166 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1167 mnt->version = 3;
1168 break;
1169#ifdef CONFIG_NFS_V4
1170 case NFS4_VERSION:
1171 mnt->flags &= ~NFS_MOUNT_VER3;
1172 mnt->version = 4;
bf0fd768 1173 break;
764302cc 1174#endif
bf0fd768 1175 default:
d23c45fd 1176 goto out_invalid_value;
bf0fd768
CL		 1177 }
1178 break;
3fd5be9e 1179 case Opt_minorversion:
f3f4f4ed
CL		 1180 string = match_strdup(args);
1181 if (string == NULL)
1182 goto out_nomem;
1183 rc = strict_strtoul(string, 10, &option);
1184 kfree(string);
1185 if (rc != 0)
1186 goto out_invalid_value;
1187 if (option > NFS4_MAX_MINOR_VERSION)
1188 goto out_invalid_value;
1189 mnt->minorversion = option;
3fd5be9e 1190 break;
bf0fd768 1191
f45663ce
CL		 1192 /*
1193 * options that take text values
1194 */
bf0fd768
CL		 1195 case Opt_sec:
1196 string = match_strdup(args);
1197 if (string == NULL)
1198 goto out_nomem;
01060c89 1199 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1200 kfree(string);
f45663ce 1201 if (!rc) {
f45663ce
CL		 1202 dfprintk(MOUNT, "NFS: unrecognized "
1203 "security flavor\n");
d23c45fd 1204 return 0;
f45663ce 1205 }
bf0fd768
CL		 1206 break;
1207 case Opt_proto:
1208 string = match_strdup(args);
1209 if (string == NULL)
1210 goto out_nomem;
1211 token = match_token(string,
1212 nfs_xprt_protocol_tokens, args);
bf0fd768
CL		 1213
1214 switch (token) {
fdb66ff4 1215 case Opt_xprt_udp:
bf0fd768 1216 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1217 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1218 kfree(string);
bf0fd768 1219 break;
fdb66ff4 1220 case Opt_xprt_tcp:
bf0fd768 1221 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1222 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1223 kfree(string);
bf0fd768 1224 break;
2cf7ff7a
TT		 1225 case Opt_xprt_rdma:
1226 /* vector side protocols to TCP */
1227 mnt->flags |= NFS_MOUNT_TCP;
1228 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1229 xprt_load_transport(string);
d23c45fd 1230 kfree(string);
2cf7ff7a 1231 break;
bf0fd768 1232 default:
f45663ce
CL		 1233 dfprintk(MOUNT, "NFS: unrecognized "
1234 "transport protocol\n");
d23c45fd 1235 return 0;
bf0fd768
CL		 1236 }
1237 break;
1238 case Opt_mountproto:
1239 string = match_strdup(args);
1240 if (string == NULL)
1241 goto out_nomem;
1242 token = match_token(string,
1243 nfs_xprt_protocol_tokens, args);
d508afb4 1244 kfree(string);
bf0fd768
CL		 1245
1246 switch (token) {
fdb66ff4 1247 case Opt_xprt_udp:
0896a725 1248 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1249 break;
fdb66ff4 1250 case Opt_xprt_tcp:
0896a725 1251 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1252 break;
2cf7ff7a 1253 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1254 default:
f45663ce
CL		 1255 dfprintk(MOUNT, "NFS: unrecognized "
1256 "transport protocol\n");
d23c45fd 1257 return 0;
bf0fd768
CL		 1258 }
1259 break;
1260 case Opt_addr:
1261 string = match_strdup(args);
1262 if (string == NULL)
1263 goto out_nomem;
53a0b9c4
CL		 1264 mnt->nfs_server.addrlen =
1265 rpc_pton(string, strlen(string),
1266 (struct sockaddr *)
1267 &mnt->nfs_server.address,
1268 sizeof(mnt->nfs_server.address));
bf0fd768 1269 kfree(string);
53a0b9c4
CL		 1270 if (mnt->nfs_server.addrlen == 0)
1271 goto out_invalid_address;
bf0fd768
CL		 1272 break;
1273 case Opt_clientaddr:
1274 string = match_strdup(args);
1275 if (string == NULL)
1276 goto out_nomem;
fc601477 1277 kfree(mnt->client_address);
bf0fd768
CL		 1278 mnt->client_address = string;
1279 break;
33832034
CL		 1280 case Opt_mounthost:
1281 string = match_strdup(args);
1282 if (string == NULL)
1283 goto out_nomem;
fc601477 1284 kfree(mnt->mount_server.hostname);
33832034
CL		 1285 mnt->mount_server.hostname = string;
1286 break;
0ac83779 1287 case Opt_mountaddr:
bf0fd768
CL		 1288 string = match_strdup(args);
1289 if (string == NULL)
1290 goto out_nomem;
53a0b9c4
CL		 1291 mnt->mount_server.addrlen =
1292 rpc_pton(string, strlen(string),
1293 (struct sockaddr *)
1294 &mnt->mount_server.address,
1295 sizeof(mnt->mount_server.address));
bf0fd768 1296 kfree(string);
53a0b9c4
CL		 1297 if (mnt->mount_server.addrlen == 0)
1298 goto out_invalid_address;
bf0fd768 1299 break;
7973c1f1
TM		 1300 case Opt_lookupcache:
1301 string = match_strdup(args);
1302 if (string == NULL)
1303 goto out_nomem;
1304 token = match_token(string,
1305 nfs_lookupcache_tokens, args);
1306 kfree(string);
1307 switch (token) {
1308 case Opt_lookupcache_all:
1309 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1310 break;
1311 case Opt_lookupcache_positive:
1312 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1313 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1314 break;
1315 case Opt_lookupcache_none:
1316 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1317 break;
1318 default:
7973c1f1
TM		 1319 dfprintk(MOUNT, "NFS: invalid "
1320 "lookupcache argument\n");
d23c45fd 1321 return 0;
7973c1f1
TM		 1322 };
1323 break;
bf0fd768 1324
f45663ce
CL		 1325 /*
1326 * Special options
1327 */
1328 case Opt_sloppy:
1329 sloppy = 1;
1330 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1331 break;
bf0fd768
CL		 1332 case Opt_userspace:
1333 case Opt_deprecated:
d33e4dfe
CL		 1334 dfprintk(MOUNT, "NFS: ignoring mount option "
1335 "'%s'\n", p);
bf0fd768
CL		 1336 break;
1337
1338 default:
d23c45fd 1339 invalid_option = 1;
f45663ce
CL		 1340 dfprintk(MOUNT, "NFS: unrecognized mount option "
1341 "'%s'\n", p);
bf0fd768
CL		 1342 }
1343 }
1344
d23c45fd
CL		 1345 if (!sloppy && invalid_option)
1346 return 0;
1347
bf0fd768
CL		 1348 return 1;
1349
53a0b9c4
CL		 1350out_invalid_address:
1351 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1352 return 0;
d23c45fd 1353out_invalid_value:
53a0b9c4 1354 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1355 return 0;
bf0fd768
CL		 1356out_nomem:
1357 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1358 return 0;
f9c3a380
EP		 1359out_security_failure:
1360 free_secdata(secdata);
1361 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1362 return 0;
bf0fd768
CL		 1363}
1364
ec88f28d
CL		 1365/*
1366 * Match the requested auth flavors with the list returned by
1367 * the server. Returns zero and sets the mount's authentication
1368 * flavor on success; returns -EACCES if server does not support
1369 * the requested flavor.
1370 */
1371static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1372 struct nfs_mount_request *request)
1373{
1374 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1375
5eecfde6
CL		 1376 /*
1377 * Certain releases of Linux's mountd return an empty
1378 * flavor list. To prevent behavioral regression with
1379 * these servers (ie. rejecting mounts that used to
1380 * succeed), revert to pre-2.6.32 behavior (no checking)
1381 * if the returned flavor list is empty.
1382 */
1383 if (server_authlist_len == 0)
1384 return 0;
1385
ec88f28d
CL		 1386 /*
1387 * We avoid sophisticated negotiating here, as there are
1388 * plenty of cases where we can get it wrong, providing
1389 * either too little or too much security.
1390 *
1391 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1392 * flavor listed first. However, some servers list
1393 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1394 * preferred default, in args->auth_flavors[0] if user
1395 * didn't specify sec= mount option.
1396 */
1397 for (i = 0; i < args->auth_flavor_len; i++)
1398 for (j = 0; j < server_authlist_len; j++)
1399 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1400 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1401 request->auth_flavs[j]);
1402 args->auth_flavors[0] = request->auth_flavs[j];
1403 return 0;
1404 }
1405
1406 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1407 nfs_umount(request);
1408 return -EACCES;
1409}
1410
0076d7b7
CL		 1411/*
1412 * Use the remote server's MOUNT service to request the NFS file handle
1413 * corresponding to the provided path.
1414 */
1415static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1416 struct nfs_fh *root_fh)
1417{
ec88f28d
CL		 1418 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1419 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1420 struct nfs_mount_request request = {
1421 .sap = (struct sockaddr *)
1422 &args->mount_server.address,
1423 .dirpath = args->nfs_server.export_path,
1424 .protocol = args->mount_server.protocol,
1425 .fh = root_fh,
50a737f8 1426 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1427 .auth_flav_len = &server_authlist_len,
1428 .auth_flavs = server_authlist,
c5d120f8 1429 };
4c568017 1430 int status;
0076d7b7
CL		 1431
1432 if (args->mount_server.version == 0) {
1433 if (args->flags & NFS_MOUNT_VER3)
1434 args->mount_server.version = NFS_MNT3_VERSION;
1435 else
1436 args->mount_server.version = NFS_MNT_VERSION;
1437 }
c5d120f8 1438 request.version = args->mount_server.version;
0076d7b7 1439
33832034 1440 if (args->mount_server.hostname)
c5d120f8 1441 request.hostname = args->mount_server.hostname;
33832034 1442 else
c5d120f8 1443 request.hostname = args->nfs_server.hostname;
33832034 1444
0076d7b7
CL		 1445 /*
1446 * Construct the mount server's address.
1447 */
4c568017 1448 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1449 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1450 args->nfs_server.addrlen);
1451 args->mount_server.addrlen = args->nfs_server.addrlen;
1452 }
c5d120f8 1453 request.salen = args->mount_server.addrlen;
4cfd74fc 1454 nfs_set_default_port(request.sap, args->mount_server.port, 0);
0076d7b7
CL		 1455
1456 /*
1457 * Now ask the mount server to map our export path
1458 * to a file handle.
1459 */
c5d120f8 1460 status = nfs_mount(&request);
ec88f28d
CL		 1461 if (status != 0) {
1462 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1463 request.hostname, status);
1464 return status;
1465 }
0076d7b7 1466
ec88f28d
CL		 1467 /*
1468 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1469 */
1470 if (args->mount_server.version != NFS_MNT3_VERSION)
1471 return 0;
1472 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1473}
1474
d1aa0825
CL		 1475static int nfs_parse_simple_hostname(const char *dev_name,
1476 char **hostname, size_t maxnamlen,
1477 char **export_path, size_t maxpathlen)
dc045898
CL		 1478{
1479 size_t len;
1480 char *colon, *comma;
1481
1482 colon = strchr(dev_name, ':');
1483 if (colon == NULL)
1484 goto out_bad_devname;
1485
1486 len = colon - dev_name;
1487 if (len > maxnamlen)
1488 goto out_hostname;
1489
1490 /* N.B. caller will free nfs_server.hostname in all cases */
1491 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1492 if (!*hostname)
1493 goto out_nomem;
1494
1495 /* kill possible hostname list: not supported */
1496 comma = strchr(*hostname, ',');
1497 if (comma != NULL) {
1498 if (comma == *hostname)
1499 goto out_bad_devname;
1500 *comma = '\0';
1501 }
1502
1503 colon++;
1504 len = strlen(colon);
1505 if (len > maxpathlen)
1506 goto out_path;
1507 *export_path = kstrndup(colon, len, GFP_KERNEL);
1508 if (!*export_path)
1509 goto out_nomem;
1510
1511 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1512 return 0;
1513
1514out_bad_devname:
1515 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1516 return -EINVAL;
1517
1518out_nomem:
1519 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1520 return -ENOMEM;
1521
1522out_hostname:
1523 dfprintk(MOUNT, "NFS: server hostname too long\n");
1524 return -ENAMETOOLONG;
1525
1526out_path:
1527 dfprintk(MOUNT, "NFS: export pathname too long\n");
1528 return -ENAMETOOLONG;
1529}
1530
d1aa0825
CL		 1531/*
1532 * Hostname has square brackets around it because it contains one or
1533 * more colons. We look for the first closing square bracket, and a
1534 * colon must follow it.
1535 */
1536static int nfs_parse_protected_hostname(const char *dev_name,
1537 char **hostname, size_t maxnamlen,
1538 char **export_path, size_t maxpathlen)
1539{
1540 size_t len;
1541 char *start, *end;
1542
1543 start = (char *)(dev_name + 1);
1544
1545 end = strchr(start, ']');
1546 if (end == NULL)
1547 goto out_bad_devname;
1548 if (*(end + 1) != ':')
1549 goto out_bad_devname;
1550
1551 len = end - start;
1552 if (len > maxnamlen)
1553 goto out_hostname;
1554
1555 /* N.B. caller will free nfs_server.hostname in all cases */
1556 *hostname = kstrndup(start, len, GFP_KERNEL);
1557 if (*hostname == NULL)
1558 goto out_nomem;
1559
1560 end += 2;
1561 len = strlen(end);
1562 if (len > maxpathlen)
1563 goto out_path;
1564 *export_path = kstrndup(end, len, GFP_KERNEL);
1565 if (!*export_path)
1566 goto out_nomem;
1567
1568 return 0;
1569
1570out_bad_devname:
1571 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1572 return -EINVAL;
1573
1574out_nomem:
1575 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1576 return -ENOMEM;
1577
1578out_hostname:
1579 dfprintk(MOUNT, "NFS: server hostname too long\n");
1580 return -ENAMETOOLONG;
1581
1582out_path:
1583 dfprintk(MOUNT, "NFS: export pathname too long\n");
1584 return -ENAMETOOLONG;
1585}
1586
1587/*
1588 * Split "dev_name" into "hostname:export_path".
1589 *
1590 * The leftmost colon demarks the split between the server's hostname
1591 * and the export path. If the hostname starts with a left square
1592 * bracket, then it may contain colons.
1593 *
1594 * Note: caller frees hostname and export path, even on error.
1595 */
1596static int nfs_parse_devname(const char *dev_name,
1597 char **hostname, size_t maxnamlen,
1598 char **export_path, size_t maxpathlen)
1599{
1600 if (*dev_name == '[')
1601 return nfs_parse_protected_hostname(dev_name,
1602 hostname, maxnamlen,
1603 export_path, maxpathlen);
1604
1605 return nfs_parse_simple_hostname(dev_name,
1606 hostname, maxnamlen,
1607 export_path, maxpathlen);
1608}
1609
f7b422b1 1610/*
54ceac45
DH		 1611 * Validate the NFS2/NFS3 mount data
1612 * - fills in the mount root filehandle
136d558c
CL		 1613 *
1614 * For option strings, user space handles the following behaviors:
1615 *
1616 * + DNS: mapping server host name to IP address ("addr=" option)
1617 *
1618 * + failure mode: how to behave if a mount request can't be handled
1619 * immediately ("fg/bg" option)
1620 *
1621 * + retry: how often to retry a mount request ("retry=" option)
1622 *
1623 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1624 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1625 */
2283f8d6
TT		 1626static int nfs_validate_mount_data(void *options,
1627 struct nfs_parsed_mount_data *args,
136d558c
CL		 1628 struct nfs_fh *mntfh,
1629 const char *dev_name)
f7b422b1 1630{
2283f8d6 1631 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1632 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1633
5df36e78
CL		 1634 if (data == NULL)
1635 goto out_no_data;
f7b422b1 1636
2283f8d6
TT		 1637 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1638 args->rsize = NFS_MAX_FILE_IO_SIZE;
1639 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1640 args->acregmin = NFS_DEF_ACREGMIN;
1641 args->acregmax = NFS_DEF_ACREGMAX;
1642 args->acdirmin = NFS_DEF_ACDIRMIN;
1643 args->acdirmax = NFS_DEF_ACDIRMAX;
4cfd74fc
CL		 1644 args->mount_server.port = NFS_UNSPEC_PORT;
1645 args->nfs_server.port = NFS_UNSPEC_PORT;
0896a725 1646 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1647 args->auth_flavors[0] = RPC_AUTH_UNIX;
059f90b3 1648 args->auth_flavor_len = 1;
764302cc 1649 args->minorversion = 0;
2283f8d6 1650
54ceac45 1651 switch (data->version) {
5df36e78
CL		 1652 case 1:
1653 data->namlen = 0;
1654 case 2:
1655 data->bsize = 0;
1656 case 3:
1657 if (data->flags & NFS_MOUNT_VER3)
1658 goto out_no_v3;
1659 data->root.size = NFS2_FHSIZE;
1660 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1661 case 4:
1662 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1663 goto out_no_sec;
1664 case 5:
1665 memset(data->context, 0, sizeof(data->context));
1666 case 6:
b7e24457
TM		 1667 if (data->flags & NFS_MOUNT_VER3) {
1668 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1669 goto out_invalid_fh;
5df36e78 1670 mntfh->size = data->root.size;
764302cc
CL		 1671 args->version = 3;
1672 } else {
5df36e78 1673 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1674 args->version = 2;
1675 }
5df36e78 1676
5df36e78
CL		 1677
1678 memcpy(mntfh->data, data->root.data, mntfh->size);
1679 if (mntfh->size < sizeof(mntfh->data))
1680 memset(mntfh->data + mntfh->size, 0,
1681 sizeof(mntfh->data) - mntfh->size);
6e88e061 1682
2283f8d6
TT		 1683 /*
1684 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1685 * can deal with.
1686 */
ff3525a5 1687 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1688 args->rsize = data->rsize;
1689 args->wsize = data->wsize;
2283f8d6
TT		 1690 args->timeo = data->timeo;
1691 args->retrans = data->retrans;
1692 args->acregmin = data->acregmin;
1693 args->acregmax = data->acregmax;
1694 args->acdirmin = data->acdirmin;
1695 args->acdirmax = data->acdirmax;
4c568017 1696
4cfd74fc 1697 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1698 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1699 if (!nfs_verify_server_address(sap))
4c568017
CL		 1700 goto out_no_address;
1701
2283f8d6 1702 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1703 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1704 /* N.B. caller will free nfs_server.hostname in all cases */
1705 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1706 args->namlen = data->namlen;
1707 args->bsize = data->bsize;
dd07c947
CL		 1708
1709 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1710 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1711 if (!args->nfs_server.hostname)
1712 goto out_nomem;
f9c3a380
EP		 1713
1714 /*
1715 * The legacy version 6 binary mount data from userspace has a
1716 * field used only to transport selinux information into the
1717 * the kernel. To continue to support that functionality we
1718 * have a touch of selinux knowledge here in the NFS code. The
1719 * userspace code converted context=blah to just blah so we are
1720 * converting back to the full string selinux understands.
1721 */
1722 if (data->context[0]){
1723#ifdef CONFIG_SECURITY_SELINUX
1724 int rc;
1725 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1726 if (!opts_str)
1727 return -ENOMEM;
1728 strcpy(opts_str, "context=");
1729 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1730 strcat(opts_str, &data->context[0]);
1731 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1732 kfree(opts_str);
1733 if (rc)
1734 return rc;
1735#else
1736 return -EINVAL;
1737#endif
1738 }
1739
5df36e78 1740 break;
136d558c 1741 default: {
136d558c 1742 int status;
136d558c 1743
2283f8d6
TT		 1744 if (nfs_parse_mount_options((char *)options, args) == 0)
1745 return -EINVAL;
136d558c 1746
4cfd74fc 1747 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1748 goto out_no_address;
1749
764302cc
CL		 1750 if (args->version == 4)
1751#ifdef CONFIG_NFS_V4
1752 return nfs4_validate_text_mount_data(options,
1753 args, dev_name);
1754#else
1755 goto out_v4_not_compiled;
1756#endif
1757
4cfd74fc 1758 nfs_set_default_port(sap, args->nfs_server.port, 0);
ed596a8a 1759
259875ef
TM		 1760 nfs_set_mount_transport_protocol(args);
1761
dc045898
CL		 1762 status = nfs_parse_devname(dev_name,
1763 &args->nfs_server.hostname,
1764 PAGE_SIZE,
1765 &args->nfs_server.export_path,
1766 NFS_MAXPATHLEN);
1767 if (!status)
1768 status = nfs_try_mount(args, mntfh);
136d558c 1769
dc045898
CL		 1770 kfree(args->nfs_server.export_path);
1771 args->nfs_server.export_path = NULL;
136d558c 1772
136d558c 1773 if (status)
fdc6e2c8 1774 return status;
136d558c 1775
136d558c
CL		 1776 break;
1777 }
f7b422b1 1778 }
54ceac45
DH		 1779
1780#ifndef CONFIG_NFS_V3
2283f8d6 1781 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1782 goto out_v3_not_compiled;
1783#endif /* !CONFIG_NFS_V3 */
f7b422b1 1784
5df36e78 1785 return 0;
f7b422b1 1786
5df36e78
CL		 1787out_no_data:
1788 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1789 return -EINVAL;
54ceac45 1790
5df36e78
CL		 1791out_no_v3:
1792 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1793 data->version);
1794 return -EINVAL;
f7b422b1 1795
5df36e78
CL		 1796out_no_sec:
1797 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1798 return -EINVAL;
1799
5df36e78
CL		 1800#ifndef CONFIG_NFS_V3
1801out_v3_not_compiled:
1802 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1803 return -EPROTONOSUPPORT;
1804#endif /* !CONFIG_NFS_V3 */
1805
764302cc
CL		 1806#ifndef CONFIG_NFS_V4
1807out_v4_not_compiled:
1808 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1809 return -EPROTONOSUPPORT;
1810#endif /* !CONFIG_NFS_V4 */
1811
63649bd7
CG		 1812out_nomem:
1813 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1814 return -ENOMEM;
1815
5df36e78
CL		 1816out_no_address:
1817 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1818 return -EINVAL;
1819
1820out_invalid_fh:
1821 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1822 return -EINVAL;
f7b422b1
DH		 1823}
1824
48b605f8
JL		 1825static int
1826nfs_compare_remount_data(struct nfs_server *nfss,
1827 struct nfs_parsed_mount_data *data)
1828{
1829 if (data->flags != nfss->flags ||
1830 data->rsize != nfss->rsize ||
1831 data->wsize != nfss->wsize ||
1832 data->retrans != nfss->client->cl_timeout->to_retries ||
1833 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1834 data->acregmin != nfss->acregmin / HZ ||
1835 data->acregmax != nfss->acregmax / HZ ||
1836 data->acdirmin != nfss->acdirmin / HZ ||
1837 data->acdirmax != nfss->acdirmax / HZ ||
1838 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1839 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1840 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1841 data->nfs_server.addrlen) != 0)
1842 return -EINVAL;
1843
1844 return 0;
1845}
1846
1847static int
1848nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1849{
1850 int error;
1851 struct nfs_server *nfss = sb->s_fs_info;
1852 struct nfs_parsed_mount_data *data;
1853 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1854 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1855 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1856
1857 /*
1858 * Userspace mount programs that send binary options generally send
1859 * them populated with default values. We have no way to know which
1860 * ones were explicitly specified. Fall back to legacy behavior and
1861 * just return success.
1862 */
31c94469
MZ		 1863 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1864 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1865 options->version <= 6))))
48b605f8
JL		 1866 return 0;
1867
1868 data = kzalloc(sizeof(*data), GFP_KERNEL);
1869 if (data == NULL)
1870 return -ENOMEM;
1871
337eb00a 1872 lock_kernel();
48b605f8
JL		 1873 /* fill out struct with values from existing mount */
1874 data->flags = nfss->flags;
1875 data->rsize = nfss->rsize;
1876 data->wsize = nfss->wsize;
1877 data->retrans = nfss->client->cl_timeout->to_retries;
1878 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1879 data->acregmin = nfss->acregmin / HZ;
1880 data->acregmax = nfss->acregmax / HZ;
1881 data->acdirmin = nfss->acdirmin / HZ;
1882 data->acdirmax = nfss->acdirmax / HZ;
1883 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1884 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1885 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1886 data->nfs_server.addrlen);
1887
1888 /* overwrite those values with any that were specified */
1889 error = nfs_parse_mount_options((char *)options, data);
1890 if (error < 0)
1891 goto out;
1892
1893 /* compare new mount options with old ones */
1894 error = nfs_compare_remount_data(nfss, data);
1895out:
1896 kfree(data);
337eb00a 1897 unlock_kernel();
48b605f8
JL		 1898 return error;
1899}
1900
f7b422b1 1901/*
54ceac45 1902 * Initialise the common bits of the superblock
f7b422b1 1903 */
54ceac45 1904static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1905{
54ceac45 1906 struct nfs_server *server = NFS_SB(sb);
5006a76c 1907
54ceac45 1908 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1909
54ceac45
DH		 1910 /* We probably want something more informative here */
1911 snprintf(sb->s_id, sizeof(sb->s_id),
1912 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1913
54ceac45
DH		 1914 if (sb->s_blocksize == 0)
1915 sb->s_blocksize = nfs_block_bits(server->wsize,
1916 &sb->s_blocksize_bits);
f7b422b1 1917
54ceac45
DH		 1918 if (server->flags & NFS_MOUNT_NOAC)
1919 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1920
54ceac45 1921 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1922}
1923
1924/*
54ceac45 1925 * Finish setting up an NFS2/3 superblock
f7b422b1 1926 */
2283f8d6
TT		 1927static void nfs_fill_super(struct super_block *sb,
1928 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1929{
1930 struct nfs_server *server = NFS_SB(sb);
5006a76c 1931
54ceac45
DH		 1932 sb->s_blocksize_bits = 0;
1933 sb->s_blocksize = 0;
1934 if (data->bsize)
1935 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1936
54ceac45
DH		 1937 if (server->flags & NFS_MOUNT_VER3) {
1938 /* The VFS shouldn't apply the umask to mode bits. We will do
1939 * so ourselves when necessary.
1940 */
1941 sb->s_flags |= MS_POSIXACL;
1942 sb->s_time_gran = 1;
816724e6 1943 }
54ceac45
DH		 1944
1945 sb->s_op = &nfs_sops;
1946 nfs_initialise_sb(sb);
f7b422b1
DH		 1947}
1948
1949/*
54ceac45 1950 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1951 */
54ceac45
DH		 1952static void nfs_clone_super(struct super_block *sb,
1953 const struct super_block *old_sb)
f7b422b1 1954{
54ceac45
DH		 1955 struct nfs_server *server = NFS_SB(sb);
1956
1957 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1958 sb->s_blocksize = old_sb->s_blocksize;
1959 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1960
f7b422b1 1961 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1962 /* The VFS shouldn't apply the umask to mode bits. We will do
1963 * so ourselves when necessary.
f7b422b1
DH		 1964 */
1965 sb->s_flags |= MS_POSIXACL;
f7b422b1 1966 sb->s_time_gran = 1;
f7b422b1
DH		 1967 }
1968
54ceac45
DH		 1969 sb->s_op = old_sb->s_op;
1970 nfs_initialise_sb(sb);
f7b422b1
DH		 1971}
1972
275a5d24
TM		 1973static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1974{
1975 const struct nfs_server *a = s->s_fs_info;
1976 const struct rpc_clnt *clnt_a = a->client;
1977 const struct rpc_clnt *clnt_b = b->client;
1978
1979 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1980 goto Ebusy;
1981 if (a->nfs_client != b->nfs_client)
1982 goto Ebusy;
1983 if (a->flags != b->flags)
1984 goto Ebusy;
1985 if (a->wsize != b->wsize)
1986 goto Ebusy;
1987 if (a->rsize != b->rsize)
1988 goto Ebusy;
1989 if (a->acregmin != b->acregmin)
1990 goto Ebusy;
1991 if (a->acregmax != b->acregmax)
1992 goto Ebusy;
1993 if (a->acdirmin != b->acdirmin)
1994 goto Ebusy;
1995 if (a->acdirmax != b->acdirmax)
1996 goto Ebusy;
1997 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1998 goto Ebusy;
e89a5a43 1999 return 1;
275a5d24 2000Ebusy:
e89a5a43
TM		 2001 return 0;
2002}
2003
2004struct nfs_sb_mountdata {
2005 struct nfs_server *server;
2006 int mntflags;
2007};
2008
2009static int nfs_set_super(struct super_block *s, void *data)
2010{
2011 struct nfs_sb_mountdata *sb_mntdata = data;
2012 struct nfs_server *server = sb_mntdata->server;
2013 int ret;
2014
2015 s->s_flags = sb_mntdata->mntflags;
2016 s->s_fs_info = server;
2017 ret = set_anon_super(s, server);
2018 if (ret == 0)
2019 server->s_dev = s->s_dev;
2020 return ret;
2021}
2022
fd00a8ff
CL		 2023static int nfs_compare_super_address(struct nfs_server *server1,
2024 struct nfs_server *server2)
2025{
2026 struct sockaddr *sap1, *sap2;
2027
2028 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2029 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2030
2031 if (sap1->sa_family != sap2->sa_family)
2032 return 0;
2033
2034 switch (sap1->sa_family) {
2035 case AF_INET: {
2036 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2037 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2038 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2039 return 0;
2040 if (sin1->sin_port != sin2->sin_port)
2041 return 0;
2042 break;
2043 }
2044 case AF_INET6: {
2045 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2046 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2047 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2048 return 0;
2049 if (sin1->sin6_port != sin2->sin6_port)
2050 return 0;
2051 break;
2052 }
2053 default:
2054 return 0;
2055 }
2056
2057 return 1;
2058}
2059
e89a5a43
TM		 2060static int nfs_compare_super(struct super_block *sb, void *data)
2061{
2062 struct nfs_sb_mountdata *sb_mntdata = data;
2063 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2064 int mntflags = sb_mntdata->mntflags;
2065
fd00a8ff 2066 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2067 return 0;
2068 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2069 if (old->flags & NFS_MOUNT_UNSHARED)
2070 return 0;
2071 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2072 return 0;
2073 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2074}
2075
fa799759
MS		 2076static int nfs_bdi_register(struct nfs_server *server)
2077{
2078 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2079}
2080
816724e6
TM		 2081static int nfs_get_sb(struct file_system_type *fs_type,
2082 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2083{
f7b422b1
DH		 2084 struct nfs_server *server = NULL;
2085 struct super_block *s;
33852a1f
TM		 2086 struct nfs_parsed_mount_data *data;
2087 struct nfs_fh *mntfh;
54ceac45 2088 struct dentry *mntroot;
75180df2 2089 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2090 struct nfs_sb_mountdata sb_mntdata = {
2091 .mntflags = flags,
2092 };
33852a1f
TM		 2093 int error = -ENOMEM;
2094
2095 data = kzalloc(sizeof(*data), GFP_KERNEL);
2096 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2097 if (data == NULL || mntfh == NULL)
2098 goto out_free_fh;
f7b422b1 2099
33852a1f 2100 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2101
54ceac45 2102 /* Validate the mount data */
33852a1f 2103 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2104 if (error < 0)
0655960f 2105 goto out;
f7b422b1 2106
764302cc
CL		 2107#ifdef CONFIG_NFS_V4
2108 if (data->version == 4) {
2109 error = nfs4_try_mount(flags, dev_name, data, mnt);
2110 kfree(data->client_address);
2111 goto out;
2112 }
2113#endif /* CONFIG_NFS_V4 */
2114
54ceac45 2115 /* Get a volume representation */
33852a1f 2116 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2117 if (IS_ERR(server)) {
2118 error = PTR_ERR(server);
0655960f 2119 goto out;
f7b422b1 2120 }
e89a5a43 2121 sb_mntdata.server = server;
f7b422b1 2122
75180df2
TM		 2123 if (server->flags & NFS_MOUNT_UNSHARED)
2124 compare_super = NULL;
2125
54ceac45 2126 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2127 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2128 if (IS_ERR(s)) {
2129 error = PTR_ERR(s);
54ceac45 2130 goto out_err_nosb;
816724e6
TM		 2131 }
2132
54ceac45
DH		 2133 if (s->s_fs_info != server) {
2134 nfs_free_server(server);
2135 server = NULL;
fa799759
MS		 2136 } else {
2137 error = nfs_bdi_register(server);
2138 if (error)
2139 goto error_splat_super;
54ceac45 2140 }
f7b422b1 2141
54ceac45
DH		 2142 if (!s->s_root) {
2143 /* initial superblock/root creation */
33852a1f 2144 nfs_fill_super(s, data);
08734048 2145 nfs_fscache_get_super_cookie(s, data);
54ceac45 2146 }
f7b422b1 2147
33852a1f 2148 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2149 if (IS_ERR(mntroot)) {
2150 error = PTR_ERR(mntroot);
2151 goto error_splat_super;
f7b422b1 2152 }
816724e6 2153
33852a1f 2154 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2155 if (error)
2156 goto error_splat_root;
2157
54ceac45
DH		 2158 s->s_flags |= MS_ACTIVE;
2159 mnt->mnt_sb = s;
2160 mnt->mnt_root = mntroot;
0655960f
CL		 2161 error = 0;
2162
2163out:
33852a1f
TM		 2164 kfree(data->nfs_server.hostname);
2165 kfree(data->mount_server.hostname);
08734048 2166 kfree(data->fscache_uniq);
33852a1f
TM		 2167 security_free_mnt_opts(&data->lsm_opts);
2168out_free_fh:
2169 kfree(mntfh);
2170 kfree(data);
0655960f 2171 return error;
816724e6 2172
54ceac45
DH		 2173out_err_nosb:
2174 nfs_free_server(server);
0655960f 2175 goto out;
54ceac45 2176
f9c3a380
EP		 2177error_splat_root:
2178 dput(mntroot);
54ceac45 2179error_splat_super:
6f5bbff9 2180 deactivate_locked_super(s);
0655960f 2181 goto out;
f7b422b1
DH		 2182}
2183
54ceac45
DH		 2184/*
2185 * Destroy an NFS2/3 superblock
2186 */
f7b422b1
DH		 2187static void nfs_kill_super(struct super_block *s)
2188{
2189 struct nfs_server *server = NFS_SB(s);
2190
fa799759 2191 bdi_unregister(&server->backing_dev_info);
f7b422b1 2192 kill_anon_super(s);
08734048 2193 nfs_fscache_release_super_cookie(s);
54ceac45 2194 nfs_free_server(server);
f7b422b1
DH		 2195}
2196
54ceac45
DH		 2197/*
2198 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2199 */
2200static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2201 const char *dev_name, void *raw_data,
2202 struct vfsmount *mnt)
f7b422b1
DH		 2203{
2204 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2205 struct super_block *s;
2206 struct nfs_server *server;
2207 struct dentry *mntroot;
75180df2 2208 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2209 struct nfs_sb_mountdata sb_mntdata = {
2210 .mntflags = flags,
2211 };
54ceac45 2212 int error;
f7b422b1 2213
54ceac45 2214 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2215
54ceac45
DH		 2216 /* create a new volume representation */
2217 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2218 if (IS_ERR(server)) {
2219 error = PTR_ERR(server);
2220 goto out_err_noserver;
2221 }
e89a5a43 2222 sb_mntdata.server = server;
8fa5c000 2223
75180df2
TM		 2224 if (server->flags & NFS_MOUNT_UNSHARED)
2225 compare_super = NULL;
2226
54ceac45 2227 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2228 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2229 if (IS_ERR(s)) {
2230 error = PTR_ERR(s);
2231 goto out_err_nosb;
2232 }
5006a76c 2233
54ceac45
DH		 2234 if (s->s_fs_info != server) {
2235 nfs_free_server(server);
2236 server = NULL;
fa799759
MS		 2237 } else {
2238 error = nfs_bdi_register(server);
2239 if (error)
2240 goto error_splat_super;
f7b422b1 2241 }
24c8dbbb 2242
54ceac45
DH		 2243 if (!s->s_root) {
2244 /* initial superblock/root creation */
54ceac45
DH		 2245 nfs_clone_super(s, data->sb);
2246 }
f7b422b1 2247
54ceac45
DH		 2248 mntroot = nfs_get_root(s, data->fh);
2249 if (IS_ERR(mntroot)) {
2250 error = PTR_ERR(mntroot);
2251 goto error_splat_super;
f7b422b1 2252 }
e9cc6c23 2253 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2254 dput(mntroot);
2255 error = -ESTALE;
2256 goto error_splat_super;
2257 }
f7b422b1 2258
54ceac45
DH		 2259 s->s_flags |= MS_ACTIVE;
2260 mnt->mnt_sb = s;
2261 mnt->mnt_root = mntroot;
f7b422b1 2262
f9c3a380
EP		 2263 /* clone any lsm security options from the parent to the new sb */
2264 security_sb_clone_mnt_opts(data->sb, s);
2265
54ceac45
DH		 2266 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2267 return 0;
24c8dbbb 2268
54ceac45
DH		 2269out_err_nosb:
2270 nfs_free_server(server);
2271out_err_noserver:
2272 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2273 return error;
f7b422b1 2274
54ceac45 2275error_splat_super:
6f5bbff9 2276 deactivate_locked_super(s);
54ceac45
DH		 2277 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2278 return error;
f7b422b1
DH		 2279}
2280
54ceac45
DH		 2281#ifdef CONFIG_NFS_V4
2282
f7b422b1 2283/*
54ceac45 2284 * Finish setting up a cloned NFS4 superblock
f7b422b1 2285 */
54ceac45
DH		 2286static void nfs4_clone_super(struct super_block *sb,
2287 const struct super_block *old_sb)
f7b422b1 2288{
54ceac45
DH		 2289 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2290 sb->s_blocksize = old_sb->s_blocksize;
2291 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2292 sb->s_time_gran = 1;
54ceac45
DH		 2293 sb->s_op = old_sb->s_op;
2294 nfs_initialise_sb(sb);
f7b422b1
DH		 2295}
2296
54ceac45
DH		 2297/*
2298 * Set up an NFS4 superblock
2299 */
2300static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2301{
54ceac45
DH		 2302 sb->s_time_gran = 1;
2303 sb->s_op = &nfs4_sops;
2304 nfs_initialise_sb(sb);
f7b422b1
DH		 2305}
2306
01c3f052
TM		 2307static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2308{
2309 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2310}
2311
7630c852
CL		 2312static int nfs4_validate_text_mount_data(void *options,
2313 struct nfs_parsed_mount_data *args,
2314 const char *dev_name)
2315{
2316 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2317
2318 nfs_set_default_port(sap, args->nfs_server.port, NFS_PORT);
2319
2320 nfs_validate_transport_protocol(args);
2321
2322 nfs4_validate_mount_flags(args);
2323
2324 if (args->auth_flavor_len > 1) {
2325 dfprintk(MOUNT,
2326 "NFS4: Too many RPC auth flavours specified\n");
2327 return -EINVAL;
2328 }
2329
2330 if (args->client_address == NULL) {
2331 dfprintk(MOUNT,
2332 "NFS4: mount program didn't pass callback address\n");
2333 return -EINVAL;
2334 }
2335
2336 return nfs_parse_devname(dev_name,
2337 &args->nfs_server.hostname,
2338 NFS4_MAXNAMLEN,
2339 &args->nfs_server.export_path,
2340 NFS4_MAXPATHLEN);
2341}
2342
f0768ebd
CL		 2343/*
2344 * Validate NFSv4 mount options
2345 */
91ea40b9
TT		 2346static int nfs4_validate_mount_data(void *options,
2347 struct nfs_parsed_mount_data *args,
2348 const char *dev_name)
f0768ebd 2349{
4cfd74fc 2350 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2351 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2352 char *c;
2353
2354 if (data == NULL)
2355 goto out_no_data;
2356
91ea40b9
TT		 2357 args->rsize = NFS_MAX_FILE_IO_SIZE;
2358 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2359 args->acregmin = NFS_DEF_ACREGMIN;
2360 args->acregmax = NFS_DEF_ACREGMAX;
2361 args->acdirmin = NFS_DEF_ACDIRMIN;
2362 args->acdirmax = NFS_DEF_ACDIRMAX;
4cfd74fc 2363 args->nfs_server.port = NFS_UNSPEC_PORT;
6738b251 2364 args->auth_flavors[0] = RPC_AUTH_UNIX;
059f90b3 2365 args->auth_flavor_len = 1;
764302cc 2366 args->version = 4;
3fd5be9e 2367 args->minorversion = 0;
91ea40b9 2368
f0768ebd
CL		 2369 switch (data->version) {
2370 case 1:
4c568017
CL		 2371 if (data->host_addrlen > sizeof(args->nfs_server.address))
2372 goto out_no_address;
2373 if (data->host_addrlen == 0)
f0768ebd 2374 goto out_no_address;
4c568017 2375 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2376 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2377 return -EFAULT;
4cfd74fc 2378 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2379 goto out_no_address;
2380
6738b251
CL		 2381 if (data->auth_flavourlen) {
2382 if (data->auth_flavourlen > 1)
2383 goto out_inval_auth;
20c71f5e 2384 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2385 data->auth_flavours,
20c71f5e 2386 sizeof(args->auth_flavors[0])))
f0768ebd 2387 return -EFAULT;
f0768ebd
CL		 2388 }
2389
2390 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2391 if (IS_ERR(c))
2392 return PTR_ERR(c);
91ea40b9 2393 args->nfs_server.hostname = c;
f0768ebd
CL		 2394
2395 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2396 if (IS_ERR(c))
2397 return PTR_ERR(c);
91ea40b9
TT		 2398 args->nfs_server.export_path = c;
2399 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2400
2401 c = strndup_user(data->client_addr.data, 16);
2402 if (IS_ERR(c))
2403 return PTR_ERR(c);
91ea40b9
TT		 2404 args->client_address = c;
2405
2406 /*
2407 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2408 * can deal with.
2409 */
2410
2411 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2412 args->rsize = data->rsize;
2413 args->wsize = data->wsize;
2414 args->timeo = data->timeo;
2415 args->retrans = data->retrans;
2416 args->acregmin = data->acregmin;
2417 args->acregmax = data->acregmax;
2418 args->acdirmin = data->acdirmin;
2419 args->acdirmax = data->acdirmax;
2420 args->nfs_server.protocol = data->proto;
259875ef 2421 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2422
2423 break;
7630c852 2424 default:
91ea40b9 2425 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2426 return -EINVAL;
2427
4cfd74fc 2428 if (!nfs_verify_server_address(sap))
80071225 2429 return -EINVAL;
dc045898 2430
7630c852 2431 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2432 }
2433
2434 return 0;
2435
2436out_no_data:
2437 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2438 return -EINVAL;
2439
2440out_inval_auth:
2441 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2442 data->auth_flavourlen);
2443 return -EINVAL;
2444
2445out_no_address:
2446 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2447 return -EINVAL;
f0768ebd
CL		 2448}
2449
54ceac45 2450/*
c02d7adf 2451 * Get the superblock for the NFS4 root partition
54ceac45 2452 */
c02d7adf 2453static int nfs4_remote_get_sb(struct file_system_type *fs_type,
816724e6 2454 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2455{
c02d7adf 2456 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2457 struct super_block *s;
2458 struct nfs_server *server;
33852a1f 2459 struct nfs_fh *mntfh;
54ceac45 2460 struct dentry *mntroot;
75180df2 2461 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2462 struct nfs_sb_mountdata sb_mntdata = {
2463 .mntflags = flags,
2464 };
33852a1f
TM		 2465 int error = -ENOMEM;
2466
33852a1f
TM		 2467 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2468 if (data == NULL || mntfh == NULL)
2469 goto out_free_fh;
f7b422b1 2470
33852a1f 2471 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2472
54ceac45 2473 /* Get a volume representation */
33852a1f 2474 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2475 if (IS_ERR(server)) {
2476 error = PTR_ERR(server);
29eb981a 2477 goto out;
f7b422b1 2478 }
e89a5a43 2479 sb_mntdata.server = server;
f7b422b1 2480
75180df2
TM		 2481 if (server->flags & NFS4_MOUNT_UNSHARED)
2482 compare_super = NULL;
2483
54ceac45 2484 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2485 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2486 if (IS_ERR(s)) {
2487 error = PTR_ERR(s);
f7b422b1 2488 goto out_free;
816724e6
TM		 2489 }
2490
5dd3177a
TM		 2491 if (s->s_fs_info != server) {
2492 nfs_free_server(server);
2493 server = NULL;
fa799759
MS		 2494 } else {
2495 error = nfs_bdi_register(server);
2496 if (error)
2497 goto error_splat_super;
5dd3177a
TM		 2498 }
2499
54ceac45
DH		 2500 if (!s->s_root) {
2501 /* initial superblock/root creation */
54ceac45 2502 nfs4_fill_super(s);
08734048 2503 nfs_fscache_get_super_cookie(s, data);
54ceac45 2504 }
f7b422b1 2505
33852a1f 2506 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2507 if (IS_ERR(mntroot)) {
2508 error = PTR_ERR(mntroot);
2509 goto error_splat_super;
f7b422b1 2510 }
54ceac45 2511
33852a1f 2512 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2513 if (error)
2514 goto error_splat_root;
2515
f7b422b1 2516 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2517 mnt->mnt_sb = s;
2518 mnt->mnt_root = mntroot;
29eb981a
CL		 2519 error = 0;
2520
2521out:
33852a1f
TM		 2522 security_free_mnt_opts(&data->lsm_opts);
2523out_free_fh:
2524 kfree(mntfh);
29eb981a 2525 return error;
54ceac45 2526
f7b422b1 2527out_free:
54ceac45 2528 nfs_free_server(server);
29eb981a 2529 goto out;
54ceac45 2530
46c8ac74
EP		 2531error_splat_root:
2532 dput(mntroot);
54ceac45 2533error_splat_super:
6f5bbff9 2534 deactivate_locked_super(s);
29eb981a 2535 goto out;
f7b422b1
DH		 2536}
2537
c02d7adf
TM		 2538static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2539 int flags, void *data, const char *hostname)
2540{
2541 struct vfsmount *root_mnt;
2542 char *root_devname;
2543 size_t len;
2544
2545 len = strlen(hostname) + 3;
2546 root_devname = kmalloc(len, GFP_KERNEL);
2547 if (root_devname == NULL)
2548 return ERR_PTR(-ENOMEM);
2549 snprintf(root_devname, len, "%s:/", hostname);
2550 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2551 kfree(root_devname);
2552 return root_mnt;
2553}
2554
b88f8a54
TM		 2555static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2556{
2557 char *page = (char *) __get_free_page(GFP_KERNEL);
2558 char *devname, *tmp;
2559
2560 if (page == NULL)
2561 return;
2562 devname = nfs_path(path->mnt->mnt_devname,
2563 path->mnt->mnt_root, path->dentry,
2564 page, PAGE_SIZE);
2565 if (devname == NULL)
2566 goto out_freepage;
2567 tmp = kstrdup(devname, GFP_KERNEL);
2568 if (tmp == NULL)
2569 goto out_freepage;
2570 kfree(mnt->mnt_devname);
2571 mnt->mnt_devname = tmp;
2572out_freepage:
2573 free_page((unsigned long)page);
2574}
2575
c02d7adf
TM		 2576static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2577 const char *export_path, struct vfsmount *mnt_target)
2578{
2579 struct mnt_namespace *ns_private;
2580 struct nameidata nd;
2581 struct super_block *s;
2582 int ret;
2583
2584 ns_private = create_mnt_ns(root_mnt);
2585 ret = PTR_ERR(ns_private);
2586 if (IS_ERR(ns_private))
2587 goto out_mntput;
2588
2589 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2590 export_path, LOOKUP_FOLLOW, &nd);
2591
2592 put_mnt_ns(ns_private);
2593
2594 if (ret != 0)
2595 goto out_err;
2596
2597 s = nd.path.mnt->mnt_sb;
2598 atomic_inc(&s->s_active);
2599 mnt_target->mnt_sb = s;
2600 mnt_target->mnt_root = dget(nd.path.dentry);
2601
b88f8a54
TM		 2602 /* Correct the device pathname */
2603 nfs_fix_devname(&nd.path, mnt_target);
2604
c02d7adf
TM		 2605 path_put(&nd.path);
2606 down_write(&s->s_umount);
2607 return 0;
2608out_mntput:
2609 mntput(root_mnt);
2610out_err:
2611 return ret;
2612}
2613
a6fe23be
CL		 2614static int nfs4_try_mount(int flags, const char *dev_name,
2615 struct nfs_parsed_mount_data *data,
2616 struct vfsmount *mnt)
2617{
2618 char *export_path;
2619 struct vfsmount *root_mnt;
2620 int error;
2621
2622 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2623
2624 export_path = data->nfs_server.export_path;
2625 data->nfs_server.export_path = "/";
2626 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2627 data->nfs_server.hostname);
2628 data->nfs_server.export_path = export_path;
2629
2630 error = PTR_ERR(root_mnt);
2631 if (IS_ERR(root_mnt))
2632 goto out;
2633
2634 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2635
2636out:
2637 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2638 error != 0 ? " [error]" : "");
2639 return error;
2640}
2641
c02d7adf
TM		 2642/*
2643 * Get the superblock for an NFS4 mountpoint
2644 */
2645static int nfs4_get_sb(struct file_system_type *fs_type,
2646 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2647{
2648 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2649 int error = -ENOMEM;
2650
2651 data = kzalloc(sizeof(*data), GFP_KERNEL);
2652 if (data == NULL)
2653 goto out_free_data;
2654
2655 /* Validate the mount data */
2656 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2657 if (error < 0)
2658 goto out;
2659
a6fe23be 2660 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2661
2662out:
2663 kfree(data->client_address);
2664 kfree(data->nfs_server.export_path);
2665 kfree(data->nfs_server.hostname);
2666 kfree(data->fscache_uniq);
2667out_free_data:
2668 kfree(data);
2669 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2670 error != 0 ? " [error]" : "");
2671 return error;
2672}
2673
f7b422b1
DH		 2674static void nfs4_kill_super(struct super_block *sb)
2675{
2676 struct nfs_server *server = NFS_SB(sb);
2677
0f3e66c6 2678 dprintk("--> %s\n", __func__);
515d8611 2679 nfs_super_return_all_delegations(sb);
f7b422b1 2680 kill_anon_super(sb);
f7b422b1 2681 nfs4_renewd_prepare_shutdown(server);
08734048 2682 nfs_fscache_release_super_cookie(sb);
54ceac45 2683 nfs_free_server(server);
0f3e66c6 2684 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2685}
2686
2687/*
54ceac45 2688 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2689 */
54ceac45
DH		 2690static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2691 const char *dev_name, void *raw_data,
2692 struct vfsmount *mnt)
f7b422b1 2693{
54ceac45
DH		 2694 struct nfs_clone_mount *data = raw_data;
2695 struct super_block *s;
2696 struct nfs_server *server;
2697 struct dentry *mntroot;
75180df2 2698 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2699 struct nfs_sb_mountdata sb_mntdata = {
2700 .mntflags = flags,
2701 };
54ceac45 2702 int error;
f7b422b1 2703
54ceac45 2704 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2705
54ceac45
DH		 2706 /* create a new volume representation */
2707 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2708 if (IS_ERR(server)) {
2709 error = PTR_ERR(server);
2710 goto out_err_noserver;
f7b422b1 2711 }
e89a5a43 2712 sb_mntdata.server = server;
f7b422b1 2713
75180df2
TM		 2714 if (server->flags & NFS4_MOUNT_UNSHARED)
2715 compare_super = NULL;
2716
54ceac45 2717 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2718 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2719 if (IS_ERR(s)) {
2720 error = PTR_ERR(s);
2721 goto out_err_nosb;
f7b422b1 2722 }
f7b422b1 2723
54ceac45
DH		 2724 if (s->s_fs_info != server) {
2725 nfs_free_server(server);
2726 server = NULL;
fa799759
MS		 2727 } else {
2728 error = nfs_bdi_register(server);
2729 if (error)
2730 goto error_splat_super;
54ceac45 2731 }
f7b422b1 2732
54ceac45
DH		 2733 if (!s->s_root) {
2734 /* initial superblock/root creation */
54ceac45
DH		 2735 nfs4_clone_super(s, data->sb);
2736 }
f7b422b1 2737
54ceac45
DH		 2738 mntroot = nfs4_get_root(s, data->fh);
2739 if (IS_ERR(mntroot)) {
2740 error = PTR_ERR(mntroot);
2741 goto error_splat_super;
2742 }
e9cc6c23
TM		 2743 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2744 dput(mntroot);
2745 error = -ESTALE;
2746 goto error_splat_super;
2747 }
f7b422b1 2748
54ceac45
DH		 2749 s->s_flags |= MS_ACTIVE;
2750 mnt->mnt_sb = s;
2751 mnt->mnt_root = mntroot;
2752
46c8ac74
EP		 2753 security_sb_clone_mnt_opts(data->sb, s);
2754
54ceac45
DH		 2755 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2756 return 0;
2757
2758out_err_nosb:
2759 nfs_free_server(server);
2760out_err_noserver:
2761 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2762 return error;
2763
2764error_splat_super:
6f5bbff9 2765 deactivate_locked_super(s);
54ceac45
DH		 2766 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2767 return error;
f7b422b1
DH		 2768}
2769
c02d7adf
TM		 2770static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2771 int flags, const char *dev_name, void *raw_data,
2772 struct vfsmount *mnt)
f7b422b1
DH		 2773{
2774 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2775 struct super_block *s;
2776 struct nfs_server *server;
2777 struct dentry *mntroot;
2778 struct nfs_fh mntfh;
75180df2 2779 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2780 struct nfs_sb_mountdata sb_mntdata = {
2781 .mntflags = flags,
2782 };
54ceac45
DH		 2783 int error;
2784
2785 dprintk("--> nfs4_referral_get_sb()\n");
2786
2787 /* create a new volume representation */
2788 server = nfs4_create_referral_server(data, &mntfh);
2789 if (IS_ERR(server)) {
2790 error = PTR_ERR(server);
2791 goto out_err_noserver;
2792 }
e89a5a43 2793 sb_mntdata.server = server;
54ceac45 2794
75180df2
TM		 2795 if (server->flags & NFS4_MOUNT_UNSHARED)
2796 compare_super = NULL;
2797
54ceac45 2798 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2799 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2800 if (IS_ERR(s)) {
2801 error = PTR_ERR(s);
2802 goto out_err_nosb;
2803 }
2804
2805 if (s->s_fs_info != server) {
2806 nfs_free_server(server);
2807 server = NULL;
fa799759
MS		 2808 } else {
2809 error = nfs_bdi_register(server);
2810 if (error)
2811 goto error_splat_super;
54ceac45
DH		 2812 }
2813
2814 if (!s->s_root) {
2815 /* initial superblock/root creation */
54ceac45
DH		 2816 nfs4_fill_super(s);
2817 }
2818
f2d0d85e 2819 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2820 if (IS_ERR(mntroot)) {
2821 error = PTR_ERR(mntroot);
2822 goto error_splat_super;
2823 }
e9cc6c23
TM		 2824 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2825 dput(mntroot);
2826 error = -ESTALE;
2827 goto error_splat_super;
2828 }
54ceac45
DH		 2829
2830 s->s_flags |= MS_ACTIVE;
2831 mnt->mnt_sb = s;
2832 mnt->mnt_root = mntroot;
2833
46c8ac74
EP		 2834 security_sb_clone_mnt_opts(data->sb, s);
2835
54ceac45
DH		 2836 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2837 return 0;
2838
2839out_err_nosb:
2840 nfs_free_server(server);
2841out_err_noserver:
2842 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2843 return error;
2844
2845error_splat_super:
6f5bbff9 2846 deactivate_locked_super(s);
54ceac45
DH		 2847 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2848 return error;
f7b422b1
DH		 2849}
2850
c02d7adf
TM		 2851/*
2852 * Create an NFS4 server record on referral traversal
2853 */
2854static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2855 int flags, const char *dev_name, void *raw_data,
2856 struct vfsmount *mnt)
2857{
2858 struct nfs_clone_mount *data = raw_data;
2859 char *export_path;
2860 struct vfsmount *root_mnt;
2861 int error;
2862
2863 dprintk("--> nfs4_referral_get_sb()\n");
2864
2865 export_path = data->mnt_path;
2866 data->mnt_path = "/";
2867
2868 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2869 flags, data, data->hostname);
2870 data->mnt_path = export_path;
2871
2872 error = PTR_ERR(root_mnt);
2873 if (IS_ERR(root_mnt))
2874 goto out;
2875
2876 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2877out:
2878 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2879 error != 0 ? " [error]" : "");
2880 return error;
2881}
2882
54ceac45 2883#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)