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NLM: Fix a regression in lockd
[linux.git] / fs / nfs / super.c
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f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <[email protected]>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * [email protected]
13 *
14 * Split from inode.c by David Howells <[email protected]>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
42#include <linux/smp_lock.h>
43#include <linux/seq_file.h>
44#include <linux/mount.h>
c02d7adf
TM		 45#include <linux/mnt_namespace.h>
46#include <linux/namei.h>
f7b422b1
DH		 47#include <linux/nfs_idmap.h>
48#include <linux/vfs.h>
49#include <linux/inet.h>
fd00a8ff 50#include <linux/in6.h>
5a0e3ad6 51#include <linux/slab.h>
fd00a8ff 52#include <net/ipv6.h>
d8e7748a 53#include <linux/netdevice.h>
f7b422b1 54#include <linux/nfs_xdr.h>
b5d5dfbd 55#include <linux/magic.h>
bf0fd768 56#include <linux/parser.h>
f7b422b1
DH		 57
58#include <asm/system.h>
59#include <asm/uaccess.h>
60
61#include "nfs4_fs.h"
62#include "callback.h"
63#include "delegation.h"
64#include "iostat.h"
65#include "internal.h"
08734048 66#include "fscache.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
69
bf0fd768
CL		 70enum {
71 /* Mount options that take no arguments */
72 Opt_soft, Opt_hard,
bf0fd768
CL		 73 Opt_posix, Opt_noposix,
74 Opt_cto, Opt_nocto,
75 Opt_ac, Opt_noac,
76 Opt_lock, Opt_nolock,
764302cc 77 Opt_v2, Opt_v3, Opt_v4,
2cf7ff7a 78 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 79 Opt_acl, Opt_noacl,
80 Opt_rdirplus, Opt_nordirplus,
75180df2 81 Opt_sharecache, Opt_nosharecache,
d740351b 82 Opt_resvport, Opt_noresvport,
b797cac7 83 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 84
85 /* Mount options that take integer arguments */
86 Opt_port,
87 Opt_rsize, Opt_wsize, Opt_bsize,
88 Opt_timeo, Opt_retrans,
89 Opt_acregmin, Opt_acregmax,
90 Opt_acdirmin, Opt_acdirmax,
91 Opt_actimeo,
92 Opt_namelen,
93 Opt_mountport,
e887cbcf 94 Opt_mountvers,
ad879cef 95 Opt_nfsvers,
3fd5be9e 96 Opt_minorversion,
bf0fd768
CL		 97
98 /* Mount options that take string arguments */
33832034 99 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 100 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 101 Opt_lookupcache,
b797cac7 102 Opt_fscache_uniq,
5eebde23 103 Opt_local_lock,
bf0fd768 104
f45663ce
CL		 105 /* Special mount options */
106 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 107
108 Opt_err
109};
110
a447c093 111static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 112 { Opt_userspace, "bg" },
113 { Opt_userspace, "fg" },
ecbb3845
CL		 114 { Opt_userspace, "retry=%s" },
115
f45663ce
CL		 116 { Opt_sloppy, "sloppy" },
117
bf0fd768
CL		 118 { Opt_soft, "soft" },
119 { Opt_hard, "hard" },
d33e4dfe
CL		 120 { Opt_deprecated, "intr" },
121 { Opt_deprecated, "nointr" },
bf0fd768
CL		 122 { Opt_posix, "posix" },
123 { Opt_noposix, "noposix" },
124 { Opt_cto, "cto" },
125 { Opt_nocto, "nocto" },
126 { Opt_ac, "ac" },
127 { Opt_noac, "noac" },
128 { Opt_lock, "lock" },
129 { Opt_nolock, "nolock" },
130 { Opt_v2, "v2" },
131 { Opt_v3, "v3" },
764302cc 132 { Opt_v4, "v4" },
bf0fd768
CL		 133 { Opt_udp, "udp" },
134 { Opt_tcp, "tcp" },
2cf7ff7a 135 { Opt_rdma, "rdma" },
bf0fd768
CL		 136 { Opt_acl, "acl" },
137 { Opt_noacl, "noacl" },
138 { Opt_rdirplus, "rdirplus" },
139 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 140 { Opt_sharecache, "sharecache" },
141 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 142 { Opt_resvport, "resvport" },
143 { Opt_noresvport, "noresvport" },
b797cac7 144 { Opt_fscache, "fsc" },
b797cac7 145 { Opt_nofscache, "nofsc" },
bf0fd768 146
a5a16bae
CL		 147 { Opt_port, "port=%s" },
148 { Opt_rsize, "rsize=%s" },
149 { Opt_wsize, "wsize=%s" },
150 { Opt_bsize, "bsize=%s" },
151 { Opt_timeo, "timeo=%s" },
152 { Opt_retrans, "retrans=%s" },
153 { Opt_acregmin, "acregmin=%s" },
154 { Opt_acregmax, "acregmax=%s" },
155 { Opt_acdirmin, "acdirmin=%s" },
156 { Opt_acdirmax, "acdirmax=%s" },
157 { Opt_actimeo, "actimeo=%s" },
158 { Opt_namelen, "namlen=%s" },
159 { Opt_mountport, "mountport=%s" },
160 { Opt_mountvers, "mountvers=%s" },
161 { Opt_nfsvers, "nfsvers=%s" },
162 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 163 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 164
165 { Opt_sec, "sec=%s" },
166 { Opt_proto, "proto=%s" },
167 { Opt_mountproto, "mountproto=%s" },
168 { Opt_addr, "addr=%s" },
169 { Opt_clientaddr, "clientaddr=%s" },
33832034 170 { Opt_mounthost, "mounthost=%s" },
0ac83779 171 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 172
7973c1f1 173 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 174 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 175 { Opt_local_lock, "local_lock=%s" },
7973c1f1 176
bf0fd768
CL		 177 { Opt_err, NULL }
178};
179
180enum {
ee671b01 181 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 182
183 Opt_xprt_err
184};
185
a447c093 186static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 187 { Opt_xprt_udp, "udp" },
ee671b01 188 { Opt_xprt_udp6, "udp6" },
bf0fd768 189 { Opt_xprt_tcp, "tcp" },
ee671b01 190 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 191 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 192
193 { Opt_xprt_err, NULL }
194};
195
196enum {
197 Opt_sec_none, Opt_sec_sys,
198 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
199 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
200 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
201
202 Opt_sec_err
203};
204
a447c093 205static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 206 { Opt_sec_none, "none" },
207 { Opt_sec_none, "null" },
208 { Opt_sec_sys, "sys" },
209
210 { Opt_sec_krb5, "krb5" },
211 { Opt_sec_krb5i, "krb5i" },
212 { Opt_sec_krb5p, "krb5p" },
213
214 { Opt_sec_lkey, "lkey" },
215 { Opt_sec_lkeyi, "lkeyi" },
216 { Opt_sec_lkeyp, "lkeyp" },
217
8d042218
OK		 218 { Opt_sec_spkm, "spkm3" },
219 { Opt_sec_spkmi, "spkm3i" },
220 { Opt_sec_spkmp, "spkm3p" },
221
bf0fd768
CL		 222 { Opt_sec_err, NULL }
223};
224
7973c1f1
TM		 225enum {
226 Opt_lookupcache_all, Opt_lookupcache_positive,
227 Opt_lookupcache_none,
228
229 Opt_lookupcache_err
230};
231
232static match_table_t nfs_lookupcache_tokens = {
233 { Opt_lookupcache_all, "all" },
234 { Opt_lookupcache_positive, "pos" },
235 { Opt_lookupcache_positive, "positive" },
236 { Opt_lookupcache_none, "none" },
237
238 { Opt_lookupcache_err, NULL }
239};
240
5eebde23
SJ		 241enum {
242 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
243 Opt_local_lock_none,
244
245 Opt_local_lock_err
246};
247
248static match_table_t nfs_local_lock_tokens = {
249 { Opt_local_lock_all, "all" },
250 { Opt_local_lock_flock, "flock" },
251 { Opt_local_lock_posix, "posix" },
252 { Opt_local_lock_none, "none" },
253
254 { Opt_local_lock_err, NULL }
255};
256
bf0fd768 257
42faad99 258static void nfs_umount_begin(struct super_block *);
816724e6 259static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 260static int nfs_show_options(struct seq_file *, struct vfsmount *);
261static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 262static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
31f43471
AV		 263static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
264 int flags, const char *dev_name, void *raw_data);
387c149b 265static void nfs_put_super(struct super_block *);
f7b422b1 266static void nfs_kill_super(struct super_block *);
48b605f8 267static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 268
269static struct file_system_type nfs_fs_type = {
270 .owner = THIS_MODULE,
271 .name = "nfs",
272 .get_sb = nfs_get_sb,
273 .kill_sb = nfs_kill_super,
349457cc 274 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 275};
276
54ceac45 277struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 278 .owner = THIS_MODULE,
279 .name = "nfs",
31f43471 280 .mount = nfs_xdev_mount,
f7b422b1 281 .kill_sb = nfs_kill_super,
349457cc 282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 283};
284
ee9b6d61 285static const struct super_operations nfs_sops = {
f7b422b1
DH		 286 .alloc_inode = nfs_alloc_inode,
287 .destroy_inode = nfs_destroy_inode,
288 .write_inode = nfs_write_inode,
387c149b 289 .put_super = nfs_put_super,
f7b422b1 290 .statfs = nfs_statfs,
b57922d9 291 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 292 .umount_begin = nfs_umount_begin,
293 .show_options = nfs_show_options,
294 .show_stats = nfs_show_stats,
48b605f8 295 .remount_fs = nfs_remount,
f7b422b1
DH		 296};
297
298#ifdef CONFIG_NFS_V4
7630c852
CL		 299static int nfs4_validate_text_mount_data(void *options,
300 struct nfs_parsed_mount_data *args, const char *dev_name);
a6fe23be
CL		 301static int nfs4_try_mount(int flags, const char *dev_name,
302 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
816724e6
TM		 303static int nfs4_get_sb(struct file_system_type *fs_type,
304 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
31f43471
AV		 305static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
306 int flags, const char *dev_name, void *raw_data);
307static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
308 int flags, const char *dev_name, void *raw_data);
54ceac45
DH		 309static int nfs4_referral_get_sb(struct file_system_type *fs_type,
310 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
31f43471
AV		 311static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
312 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 313static void nfs4_kill_super(struct super_block *sb);
314
315static struct file_system_type nfs4_fs_type = {
316 .owner = THIS_MODULE,
317 .name = "nfs4",
318 .get_sb = nfs4_get_sb,
319 .kill_sb = nfs4_kill_super,
349457cc 320 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 321};
322
c02d7adf
TM		 323static struct file_system_type nfs4_remote_fs_type = {
324 .owner = THIS_MODULE,
325 .name = "nfs4",
31f43471 326 .mount = nfs4_remote_mount,
c02d7adf
TM		 327 .kill_sb = nfs4_kill_super,
328 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
329};
330
54ceac45 331struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 332 .owner = THIS_MODULE,
333 .name = "nfs4",
31f43471 334 .mount = nfs4_xdev_mount,
f7b422b1 335 .kill_sb = nfs4_kill_super,
349457cc 336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 337};
338
c02d7adf
TM		 339static struct file_system_type nfs4_remote_referral_fs_type = {
340 .owner = THIS_MODULE,
341 .name = "nfs4",
31f43471 342 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 343 .kill_sb = nfs4_kill_super,
344 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
345};
346
54ceac45 347struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 348 .owner = THIS_MODULE,
349 .name = "nfs4",
54ceac45 350 .get_sb = nfs4_referral_get_sb,
f7b422b1 351 .kill_sb = nfs4_kill_super,
349457cc 352 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 353};
354
ee9b6d61 355static const struct super_operations nfs4_sops = {
f7b422b1
DH		 356 .alloc_inode = nfs_alloc_inode,
357 .destroy_inode = nfs_destroy_inode,
358 .write_inode = nfs_write_inode,
387c149b 359 .put_super = nfs_put_super,
f7b422b1 360 .statfs = nfs_statfs,
b57922d9 361 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 362 .umount_begin = nfs_umount_begin,
363 .show_options = nfs_show_options,
364 .show_stats = nfs_show_stats,
48b605f8 365 .remount_fs = nfs_remount,
f7b422b1
DH		 366};
367#endif
368
8e1f936b
RR		 369static struct shrinker acl_shrinker = {
370 .shrink = nfs_access_cache_shrinker,
371 .seeks = DEFAULT_SEEKS,
372};
979df72e 373
f7b422b1
DH		 374/*
375 * Register the NFS filesystems
376 */
377int __init register_nfs_fs(void)
378{
379 int ret;
380
381 ret = register_filesystem(&nfs_fs_type);
382 if (ret < 0)
383 goto error_0;
384
f7b422b1
DH		 385 ret = nfs_register_sysctl();
386 if (ret < 0)
387 goto error_1;
89a09141 388#ifdef CONFIG_NFS_V4
f7b422b1
DH		 389 ret = register_filesystem(&nfs4_fs_type);
390 if (ret < 0)
391 goto error_2;
392#endif
8e1f936b 393 register_shrinker(&acl_shrinker);
f7b422b1
DH		 394 return 0;
395
396#ifdef CONFIG_NFS_V4
397error_2:
398 nfs_unregister_sysctl();
89a09141 399#endif
f7b422b1
DH		 400error_1:
401 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 402error_0:
403 return ret;
404}
405
406/*
407 * Unregister the NFS filesystems
408 */
409void __exit unregister_nfs_fs(void)
410{
8e1f936b 411 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 412#ifdef CONFIG_NFS_V4
413 unregister_filesystem(&nfs4_fs_type);
f7b422b1 414#endif
49af7ee1 415 nfs_unregister_sysctl();
f7b422b1
DH		 416 unregister_filesystem(&nfs_fs_type);
417}
418
1daef0a8 419void nfs_sb_active(struct super_block *sb)
ef818a28 420{
1daef0a8 421 struct nfs_server *server = NFS_SB(sb);
ef818a28 422
1daef0a8
TM		 423 if (atomic_inc_return(&server->active) == 1)
424 atomic_inc(&sb->s_active);
ef818a28
SD		 425}
426
1daef0a8 427void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 428{
429 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 430
431 if (atomic_dec_and_test(&server->active))
432 deactivate_super(sb);
ef818a28
SD		 433}
434
f7b422b1
DH		 435/*
436 * Deliver file system statistics to userspace
437 */
816724e6 438static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 439{
0c7d90cf 440 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 441 unsigned char blockbits;
442 unsigned long blockres;
0c7d90cf 443 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 444 struct nfs_fsstat res;
445 int error = -ENOMEM;
446
447 res.fattr = nfs_alloc_fattr();
448 if (res.fattr == NULL)
449 goto out_err;
f7b422b1 450
8fa5c000 451 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 452 if (unlikely(error == -ESTALE)) {
453 struct dentry *pd_dentry;
454
455 pd_dentry = dget_parent(dentry);
456 if (pd_dentry != NULL) {
457 nfs_zap_caches(pd_dentry->d_inode);
458 dput(pd_dentry);
459 }
460 }
ca7e9a0d 461 nfs_free_fattr(res.fattr);
f7b422b1
DH		 462 if (error < 0)
463 goto out_err;
ca7e9a0d 464
1a0ba9ae 465 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 466
467 /*
468 * Current versions of glibc do not correctly handle the
469 * case where f_frsize != f_bsize. Eventually we want to
470 * report the value of wtmult in this field.
471 */
0c7d90cf 472 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 473
474 /*
475 * On most *nix systems, f_blocks, f_bfree, and f_bavail
476 * are reported in units of f_frsize. Linux hasn't had
477 * an f_frsize field in its statfs struct until recently,
478 * thus historically Linux's sys_statfs reports these
479 * fields in units of f_bsize.
480 */
0c7d90cf
DH		 481 buf->f_bsize = dentry->d_sb->s_blocksize;
482 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 483 blockres = (1 << blockbits) - 1;
484 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
485 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
486 buf->f_bavail = (res.abytes + blockres) >> blockbits;
487
488 buf->f_files = res.tfiles;
489 buf->f_ffree = res.afiles;
490
491 buf->f_namelen = server->namelen;
1a0ba9ae 492
f7b422b1
DH		 493 return 0;
494
495 out_err:
3110ff80 496 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 497 return error;
f7b422b1
DH		 498}
499
7d4e2747
DH		 500/*
501 * Map the security flavour number to a name
502 */
81039f1f
TM		 503static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
504{
7d4e2747 505 static const struct {
81039f1f
TM		 506 rpc_authflavor_t flavour;
507 const char *str;
508 } sec_flavours[] = {
509 { RPC_AUTH_NULL, "null" },
510 { RPC_AUTH_UNIX, "sys" },
511 { RPC_AUTH_GSS_KRB5, "krb5" },
512 { RPC_AUTH_GSS_KRB5I, "krb5i" },
513 { RPC_AUTH_GSS_KRB5P, "krb5p" },
514 { RPC_AUTH_GSS_LKEY, "lkey" },
515 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
516 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
517 { RPC_AUTH_GSS_SPKM, "spkm" },
518 { RPC_AUTH_GSS_SPKMI, "spkmi" },
519 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 520 { UINT_MAX, "unknown" }
81039f1f
TM		 521 };
522 int i;
523
4d81cd16 524 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 525 if (sec_flavours[i].flavour == flavour)
526 break;
527 }
528 return sec_flavours[i].str;
529}
530
ee671b01
JL		 531static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
532 int showdefaults)
533{
534 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
535
536 seq_printf(m, ",mountproto=");
537 switch (sap->sa_family) {
538 case AF_INET:
539 switch (nfss->mountd_protocol) {
540 case IPPROTO_UDP:
541 seq_printf(m, RPCBIND_NETID_UDP);
542 break;
543 case IPPROTO_TCP:
544 seq_printf(m, RPCBIND_NETID_TCP);
545 break;
546 default:
547 if (showdefaults)
548 seq_printf(m, "auto");
549 }
550 break;
551 case AF_INET6:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP6);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP6);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 default:
565 if (showdefaults)
566 seq_printf(m, "auto");
567 }
568}
569
82d101d5
CL		 570static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
571 int showdefaults)
572{
573 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
574
d5eff1a3
BS		 575 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
576 return;
577
82d101d5
CL		 578 switch (sap->sa_family) {
579 case AF_INET: {
580 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 581 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 582 break;
583 }
584 case AF_INET6: {
585 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 586 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 587 break;
588 }
589 default:
590 if (showdefaults)
591 seq_printf(m, ",mountaddr=unspecified");
592 }
593
594 if (nfss->mountd_version || showdefaults)
595 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
596 if (nfss->mountd_port || showdefaults)
597 seq_printf(m, ",mountport=%u", nfss->mountd_port);
598
ee671b01 599 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 600}
601
0be8189f
TM		 602#ifdef CONFIG_NFS_V4
603static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
604 int showdefaults)
605{
606 struct nfs_client *clp = nfss->nfs_client;
607
608 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
609 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
610}
611#else
612static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
613 int showdefaults)
614{
615}
616#endif
617
f7b422b1
DH		 618/*
619 * Describe the mount options in force on this server representation
620 */
82d101d5
CL		 621static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
622 int showdefaults)
f7b422b1 623{
509de811 624 static const struct proc_nfs_info {
f7b422b1 625 int flag;
509de811
DH		 626 const char *str;
627 const char *nostr;
f7b422b1
DH		 628 } nfs_info[] = {
629 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 630 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 631 { NFS_MOUNT_NOCTO, ",nocto", "" },
632 { NFS_MOUNT_NOAC, ",noac", "" },
633 { NFS_MOUNT_NONLM, ",nolock", "" },
634 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 635 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 636 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
637 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 638 { 0, NULL, NULL }
639 };
509de811 640 const struct proc_nfs_info *nfs_infop;
8fa5c000 641 struct nfs_client *clp = nfss->nfs_client;
82d101d5 642 u32 version = clp->rpc_ops->version;
7c563cc9 643 int local_flock, local_fcntl;
f7b422b1 644
82d101d5 645 seq_printf(m, ",vers=%u", version);
2d767432
CL		 646 seq_printf(m, ",rsize=%u", nfss->rsize);
647 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 648 if (nfss->bsize != 0)
649 seq_printf(m, ",bsize=%u", nfss->bsize);
650 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 651 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 652 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 653 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 654 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 655 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 656 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 657 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 658 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 659 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
660 if (nfss->flags & nfs_infop->flag)
661 seq_puts(m, nfs_infop->str);
662 else
663 seq_puts(m, nfs_infop->nostr);
664 }
56928edd 665 seq_printf(m, ",proto=%s",
ee671b01 666 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 667 if (version == 4) {
668 if (nfss->port != NFS_PORT)
669 seq_printf(m, ",port=%u", nfss->port);
670 } else
671 if (nfss->port)
672 seq_printf(m, ",port=%u", nfss->port);
673
33170233
TM		 674 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
675 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 676 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 677
678 if (version != 4)
679 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 680 else
681 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 682
b797cac7
DH		 683 if (nfss->options & NFS_OPTION_FSCACHE)
684 seq_printf(m, ",fsc");
9b00c643
PL		 685
686 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
687 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
688 seq_printf(m, ",lookupcache=none");
689 else
690 seq_printf(m, ",lookupcache=pos");
691 }
7c563cc9
SJ		 692
693 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
694 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
695
696 if (!local_flock && !local_fcntl)
697 seq_printf(m, ",local_lock=none");
698 else if (local_flock && local_fcntl)
699 seq_printf(m, ",local_lock=all");
700 else if (local_flock)
701 seq_printf(m, ",local_lock=flock");
702 else
703 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 704}
705
706/*
707 * Describe the mount options on this VFS mountpoint
708 */
709static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
710{
711 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
712
713 nfs_show_mount_options(m, nfss, 0);
714
5d8515ca
CL		 715 seq_printf(m, ",addr=%s",
716 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
717 RPC_DISPLAY_ADDR));
f7b422b1
DH		 718
719 return 0;
720}
721
722/*
723 * Present statistical information for this VFS mountpoint
724 */
725static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
726{
727 int i, cpu;
728 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
729 struct rpc_auth *auth = nfss->client->cl_auth;
730 struct nfs_iostats totals = { };
731
732 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
733
734 /*
735 * Display all mount option settings
736 */
737 seq_printf(m, "\n\topts:\t");
738 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
739 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
740 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
741 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
742 nfs_show_mount_options(m, nfss, 1);
743
744 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
745
746 seq_printf(m, "\n\tcaps:\t");
747 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 748 seq_printf(m, ",wtmult=%u", nfss->wtmult);
749 seq_printf(m, ",dtsize=%u", nfss->dtsize);
750 seq_printf(m, ",bsize=%u", nfss->bsize);
751 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 752
753#ifdef CONFIG_NFS_V4
40c55319 754 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 755 seq_printf(m, "\n\tnfsv4:\t");
756 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
757 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
758 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
759 }
760#endif
761
762 /*
763 * Display security flavor in effect for this mount
764 */
2d767432 765 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 766 if (auth->au_flavor)
2d767432 767 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 768
769 /*
770 * Display superblock I/O counters
771 */
772 for_each_possible_cpu(cpu) {
773 struct nfs_iostats *stats;
774
775 preempt_disable();
776 stats = per_cpu_ptr(nfss->io_stats, cpu);
777
778 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
779 totals.events[i] += stats->events[i];
780 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
781 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 782#ifdef CONFIG_NFS_FSCACHE
783 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
784 totals.fscache[i] += stats->fscache[i];
785#endif
f7b422b1
DH		 786
787 preempt_enable();
788 }
789
790 seq_printf(m, "\n\tevents:\t");
791 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
792 seq_printf(m, "%lu ", totals.events[i]);
793 seq_printf(m, "\n\tbytes:\t");
794 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
795 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 796#ifdef CONFIG_NFS_FSCACHE
797 if (nfss->options & NFS_OPTION_FSCACHE) {
798 seq_printf(m, "\n\tfsc:\t");
799 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
800 seq_printf(m, "%Lu ", totals.bytes[i]);
801 }
802#endif
f7b422b1
DH		 803 seq_printf(m, "\n");
804
805 rpc_print_iostats(m, nfss->client);
806
807 return 0;
808}
809
810/*
811 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 812 * in response to xdev traversals and referrals
f7b422b1 813 */
42faad99 814static void nfs_umount_begin(struct super_block *sb)
f7b422b1 815{
67e55205 816 struct nfs_server *server;
fc6ae3cf
TM		 817 struct rpc_clnt *rpc;
818
67e55205 819 server = NFS_SB(sb);
fc6ae3cf
TM		 820 /* -EIO all pending I/O */
821 rpc = server->client_acl;
822 if (!IS_ERR(rpc))
823 rpc_killall_tasks(rpc);
824 rpc = server->client;
825 if (!IS_ERR(rpc))
826 rpc_killall_tasks(rpc);
f7b422b1
DH		 827}
828
c5811dbd 829static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 830{
831 struct nfs_parsed_mount_data *data;
832
833 data = kzalloc(sizeof(*data), GFP_KERNEL);
834 if (data) {
9423a08a
CL		 835 data->acregmin = NFS_DEF_ACREGMIN;
836 data->acregmax = NFS_DEF_ACREGMAX;
837 data->acdirmin = NFS_DEF_ACDIRMIN;
838 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 839 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 840 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 841 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 842 data->auth_flavors[0] = RPC_AUTH_UNIX;
843 data->auth_flavor_len = 1;
c5811dbd 844 data->version = version;
9423a08a
CL		 845 data->minorversion = 0;
846 }
847 return data;
848}
849
fc50d58f 850/*
cdcd7f9a
CL		 851 * Sanity-check a server address provided by the mount command.
852 *
853 * Address family must be initialized, and address must not be
854 * the ANY address for that family.
fc50d58f
CL		 855 */
856static int nfs_verify_server_address(struct sockaddr *addr)
857{
858 switch (addr->sa_family) {
859 case AF_INET: {
cdcd7f9a 860 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 861 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 862 }
863 case AF_INET6: {
864 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
865 return !ipv6_addr_any(sa);
fc50d58f
CL		 866 }
867 }
868
53a0b9c4 869 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 870 return 0;
871}
872
4cfd74fc
CL		 873/*
874 * Select between a default port value and a user-specified port value.
875 * If a zero value is set, then autobind will be used.
876 */
f5855fec 877static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 878 const unsigned short default_port)
879{
f5855fec
TM		 880 if (*port == NFS_UNSPEC_PORT)
881 *port = default_port;
4cfd74fc 882
f5855fec 883 rpc_set_port(sap, *port);
4cfd74fc
CL		 884}
885
259875ef
TM		 886/*
887 * Sanity check the NFS transport protocol.
888 *
889 */
890static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
891{
892 switch (mnt->nfs_server.protocol) {
893 case XPRT_TRANSPORT_UDP:
894 case XPRT_TRANSPORT_TCP:
895 case XPRT_TRANSPORT_RDMA:
896 break;
897 default:
898 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
899 }
900}
901
902/*
903 * For text based NFSv2/v3 mounts, the mount protocol transport default
904 * settings should depend upon the specified NFS transport.
905 */
906static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
907{
908 nfs_validate_transport_protocol(mnt);
909
910 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
911 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
912 return;
913 switch (mnt->nfs_server.protocol) {
914 case XPRT_TRANSPORT_UDP:
915 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
916 break;
917 case XPRT_TRANSPORT_TCP:
918 case XPRT_TRANSPORT_RDMA:
919 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
920 }
921}
922
01060c89
CL		 923/*
924 * Parse the value of the 'sec=' option.
01060c89
CL		 925 */
926static int nfs_parse_security_flavors(char *value,
927 struct nfs_parsed_mount_data *mnt)
928{
929 substring_t args[MAX_OPT_ARGS];
930
931 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
932
933 switch (match_token(value, nfs_secflavor_tokens, args)) {
934 case Opt_sec_none:
01060c89
CL		 935 mnt->auth_flavors[0] = RPC_AUTH_NULL;
936 break;
937 case Opt_sec_sys:
01060c89
CL		 938 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
939 break;
940 case Opt_sec_krb5:
01060c89
CL		 941 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
942 break;
943 case Opt_sec_krb5i:
01060c89
CL		 944 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
945 break;
946 case Opt_sec_krb5p:
01060c89
CL		 947 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
948 break;
949 case Opt_sec_lkey:
01060c89
CL		 950 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
951 break;
952 case Opt_sec_lkeyi:
01060c89
CL		 953 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
954 break;
955 case Opt_sec_lkeyp:
01060c89
CL		 956 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
957 break;
958 case Opt_sec_spkm:
01060c89
CL		 959 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
960 break;
961 case Opt_sec_spkmi:
01060c89
CL		 962 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
963 break;
964 case Opt_sec_spkmp:
01060c89
CL		 965 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
966 break;
967 default:
968 return 0;
969 }
970
059f90b3 971 mnt->auth_flavor_len = 1;
01060c89
CL		 972 return 1;
973}
974
bf0fd768
CL		 975/*
976 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 977 * a data structure. The whole mount string is processed; bad options are
978 * skipped as they are encountered. If there were no errors, return 1;
979 * otherwise return 0 (zero).
bf0fd768
CL		 980 */
981static int nfs_parse_mount_options(char *raw,
982 struct nfs_parsed_mount_data *mnt)
983{
f9c3a380 984 char *p, *string, *secdata;
d23c45fd 985 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 986 unsigned short protofamily = AF_UNSPEC;
987 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 988
989 if (!raw) {
990 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
991 return 1;
992 }
993 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
994
f9c3a380
EP		 995 secdata = alloc_secdata();
996 if (!secdata)
997 goto out_nomem;
998
999 rc = security_sb_copy_data(raw, secdata);
1000 if (rc)
1001 goto out_security_failure;
1002
1003 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1004 if (rc)
1005 goto out_security_failure;
1006
1007 free_secdata(secdata);
1008
bf0fd768
CL		 1009 while ((p = strsep(&raw, ",")) != NULL) {
1010 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1011 unsigned long option;
1012 int token;
bf0fd768
CL		 1013
1014 if (!*p)
1015 continue;
1016
1017 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1018
1019 token = match_token(p, nfs_mount_option_tokens, args);
1020 switch (token) {
f45663ce
CL		 1021
1022 /*
1023 * boolean options: foo/nofoo
1024 */
bf0fd768
CL		 1025 case Opt_soft:
1026 mnt->flags |= NFS_MOUNT_SOFT;
1027 break;
1028 case Opt_hard:
1029 mnt->flags &= ~NFS_MOUNT_SOFT;
1030 break;
bf0fd768
CL		 1031 case Opt_posix:
1032 mnt->flags |= NFS_MOUNT_POSIX;
1033 break;
1034 case Opt_noposix:
1035 mnt->flags &= ~NFS_MOUNT_POSIX;
1036 break;
1037 case Opt_cto:
1038 mnt->flags &= ~NFS_MOUNT_NOCTO;
1039 break;
1040 case Opt_nocto:
1041 mnt->flags |= NFS_MOUNT_NOCTO;
1042 break;
1043 case Opt_ac:
1044 mnt->flags &= ~NFS_MOUNT_NOAC;
1045 break;
1046 case Opt_noac:
1047 mnt->flags |= NFS_MOUNT_NOAC;
1048 break;
1049 case Opt_lock:
1050 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1051 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1052 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1053 break;
1054 case Opt_nolock:
1055 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1056 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1057 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1058 break;
1059 case Opt_v2:
1060 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1061 mnt->version = 2;
bf0fd768
CL		 1062 break;
1063 case Opt_v3:
1064 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1065 mnt->version = 3;
bf0fd768 1066 break;
764302cc
CL		 1067#ifdef CONFIG_NFS_V4
1068 case Opt_v4:
1069 mnt->flags &= ~NFS_MOUNT_VER3;
1070 mnt->version = 4;
1071 break;
1072#endif
bf0fd768
CL		 1073 case Opt_udp:
1074 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1075 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1076 break;
1077 case Opt_tcp:
1078 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1079 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1080 break;
2cf7ff7a
TT		 1081 case Opt_rdma:
1082 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1083 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1084 xprt_load_transport(p);
2cf7ff7a 1085 break;
bf0fd768
CL		 1086 case Opt_acl:
1087 mnt->flags &= ~NFS_MOUNT_NOACL;
1088 break;
1089 case Opt_noacl:
1090 mnt->flags |= NFS_MOUNT_NOACL;
1091 break;
1092 case Opt_rdirplus:
1093 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1094 break;
1095 case Opt_nordirplus:
1096 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1097 break;
75180df2
TM		 1098 case Opt_sharecache:
1099 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1100 break;
1101 case Opt_nosharecache:
1102 mnt->flags |= NFS_MOUNT_UNSHARED;
1103 break;
d740351b
CL		 1104 case Opt_resvport:
1105 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1106 break;
1107 case Opt_noresvport:
1108 mnt->flags |= NFS_MOUNT_NORESVPORT;
1109 break;
b797cac7
DH		 1110 case Opt_fscache:
1111 mnt->options |= NFS_OPTION_FSCACHE;
1112 kfree(mnt->fscache_uniq);
1113 mnt->fscache_uniq = NULL;
1114 break;
1115 case Opt_nofscache:
1116 mnt->options &= ~NFS_OPTION_FSCACHE;
1117 kfree(mnt->fscache_uniq);
1118 mnt->fscache_uniq = NULL;
1119 break;
bf0fd768 1120
f45663ce
CL		 1121 /*
1122 * options that take numeric values
1123 */
bf0fd768 1124 case Opt_port:
a5a16bae
CL		 1125 string = match_strdup(args);
1126 if (string == NULL)
1127 goto out_nomem;
1128 rc = strict_strtoul(string, 10, &option);
1129 kfree(string);
4be929be 1130 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1131 goto out_invalid_value;
1132 mnt->nfs_server.port = option;
bf0fd768
CL		 1133 break;
1134 case Opt_rsize:
a5a16bae
CL		 1135 string = match_strdup(args);
1136 if (string == NULL)
1137 goto out_nomem;
1138 rc = strict_strtoul(string, 10, &option);
1139 kfree(string);
1140 if (rc != 0)
d23c45fd
CL		 1141 goto out_invalid_value;
1142 mnt->rsize = option;
bf0fd768
CL		 1143 break;
1144 case Opt_wsize:
a5a16bae
CL		 1145 string = match_strdup(args);
1146 if (string == NULL)
1147 goto out_nomem;
1148 rc = strict_strtoul(string, 10, &option);
1149 kfree(string);
1150 if (rc != 0)
d23c45fd
CL		 1151 goto out_invalid_value;
1152 mnt->wsize = option;
bf0fd768
CL		 1153 break;
1154 case Opt_bsize:
a5a16bae
CL		 1155 string = match_strdup(args);
1156 if (string == NULL)
1157 goto out_nomem;
1158 rc = strict_strtoul(string, 10, &option);
1159 kfree(string);
1160 if (rc != 0)
d23c45fd
CL		 1161 goto out_invalid_value;
1162 mnt->bsize = option;
bf0fd768
CL		 1163 break;
1164 case Opt_timeo:
a5a16bae
CL		 1165 string = match_strdup(args);
1166 if (string == NULL)
1167 goto out_nomem;
1168 rc = strict_strtoul(string, 10, &option);
1169 kfree(string);
1170 if (rc != 0 || option == 0)
d23c45fd
CL		 1171 goto out_invalid_value;
1172 mnt->timeo = option;
bf0fd768
CL		 1173 break;
1174 case Opt_retrans:
a5a16bae
CL		 1175 string = match_strdup(args);
1176 if (string == NULL)
1177 goto out_nomem;
1178 rc = strict_strtoul(string, 10, &option);
1179 kfree(string);
1180 if (rc != 0 || option == 0)
d23c45fd
CL		 1181 goto out_invalid_value;
1182 mnt->retrans = option;
bf0fd768
CL		 1183 break;
1184 case Opt_acregmin:
a5a16bae
CL		 1185 string = match_strdup(args);
1186 if (string == NULL)
1187 goto out_nomem;
1188 rc = strict_strtoul(string, 10, &option);
1189 kfree(string);
1190 if (rc != 0)
d23c45fd
CL		 1191 goto out_invalid_value;
1192 mnt->acregmin = option;
bf0fd768
CL		 1193 break;
1194 case Opt_acregmax:
a5a16bae
CL		 1195 string = match_strdup(args);
1196 if (string == NULL)
1197 goto out_nomem;
1198 rc = strict_strtoul(string, 10, &option);
1199 kfree(string);
1200 if (rc != 0)
d23c45fd
CL		 1201 goto out_invalid_value;
1202 mnt->acregmax = option;
bf0fd768
CL		 1203 break;
1204 case Opt_acdirmin:
a5a16bae
CL		 1205 string = match_strdup(args);
1206 if (string == NULL)
1207 goto out_nomem;
1208 rc = strict_strtoul(string, 10, &option);
1209 kfree(string);
1210 if (rc != 0)
d23c45fd
CL		 1211 goto out_invalid_value;
1212 mnt->acdirmin = option;
bf0fd768
CL		 1213 break;
1214 case Opt_acdirmax:
a5a16bae
CL		 1215 string = match_strdup(args);
1216 if (string == NULL)
1217 goto out_nomem;
1218 rc = strict_strtoul(string, 10, &option);
1219 kfree(string);
1220 if (rc != 0)
d23c45fd
CL		 1221 goto out_invalid_value;
1222 mnt->acdirmax = option;
bf0fd768
CL		 1223 break;
1224 case Opt_actimeo:
a5a16bae
CL		 1225 string = match_strdup(args);
1226 if (string == NULL)
1227 goto out_nomem;
1228 rc = strict_strtoul(string, 10, &option);
1229 kfree(string);
1230 if (rc != 0)
d23c45fd
CL		 1231 goto out_invalid_value;
1232 mnt->acregmin = mnt->acregmax =
1233 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1234 break;
1235 case Opt_namelen:
a5a16bae
CL		 1236 string = match_strdup(args);
1237 if (string == NULL)
1238 goto out_nomem;
1239 rc = strict_strtoul(string, 10, &option);
1240 kfree(string);
1241 if (rc != 0)
d23c45fd
CL		 1242 goto out_invalid_value;
1243 mnt->namlen = option;
bf0fd768
CL		 1244 break;
1245 case Opt_mountport:
a5a16bae
CL		 1246 string = match_strdup(args);
1247 if (string == NULL)
1248 goto out_nomem;
1249 rc = strict_strtoul(string, 10, &option);
1250 kfree(string);
4be929be 1251 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1252 goto out_invalid_value;
1253 mnt->mount_server.port = option;
bf0fd768 1254 break;
bf0fd768 1255 case Opt_mountvers:
a5a16bae
CL		 1256 string = match_strdup(args);
1257 if (string == NULL)
1258 goto out_nomem;
1259 rc = strict_strtoul(string, 10, &option);
1260 kfree(string);
1261 if (rc != 0 ||
f45663ce 1262 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1263 option > NFS_MNT3_VERSION)
1264 goto out_invalid_value;
1265 mnt->mount_server.version = option;
bf0fd768 1266 break;
bf0fd768 1267 case Opt_nfsvers:
a5a16bae
CL		 1268 string = match_strdup(args);
1269 if (string == NULL)
1270 goto out_nomem;
1271 rc = strict_strtoul(string, 10, &option);
1272 kfree(string);
1273 if (rc != 0)
d23c45fd 1274 goto out_invalid_value;
bf0fd768 1275 switch (option) {
f45663ce 1276 case NFS2_VERSION:
bf0fd768 1277 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1278 mnt->version = 2;
bf0fd768 1279 break;
f45663ce 1280 case NFS3_VERSION:
bf0fd768 1281 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1282 mnt->version = 3;
1283 break;
1284#ifdef CONFIG_NFS_V4
1285 case NFS4_VERSION:
1286 mnt->flags &= ~NFS_MOUNT_VER3;
1287 mnt->version = 4;
bf0fd768 1288 break;
764302cc 1289#endif
bf0fd768 1290 default:
d23c45fd 1291 goto out_invalid_value;
bf0fd768
CL		 1292 }
1293 break;
3fd5be9e 1294 case Opt_minorversion:
f3f4f4ed
CL		 1295 string = match_strdup(args);
1296 if (string == NULL)
1297 goto out_nomem;
1298 rc = strict_strtoul(string, 10, &option);
1299 kfree(string);
1300 if (rc != 0)
1301 goto out_invalid_value;
1302 if (option > NFS4_MAX_MINOR_VERSION)
1303 goto out_invalid_value;
1304 mnt->minorversion = option;
3fd5be9e 1305 break;
bf0fd768 1306
f45663ce
CL		 1307 /*
1308 * options that take text values
1309 */
bf0fd768
CL		 1310 case Opt_sec:
1311 string = match_strdup(args);
1312 if (string == NULL)
1313 goto out_nomem;
01060c89 1314 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1315 kfree(string);
f45663ce 1316 if (!rc) {
f45663ce
CL		 1317 dfprintk(MOUNT, "NFS: unrecognized "
1318 "security flavor\n");
d23c45fd 1319 return 0;
f45663ce 1320 }
bf0fd768
CL		 1321 break;
1322 case Opt_proto:
1323 string = match_strdup(args);
1324 if (string == NULL)
1325 goto out_nomem;
1326 token = match_token(string,
1327 nfs_xprt_protocol_tokens, args);
bf0fd768 1328
ee671b01 1329 protofamily = AF_INET;
bf0fd768 1330 switch (token) {
ee671b01
JL		 1331 case Opt_xprt_udp6:
1332 protofamily = AF_INET6;
fdb66ff4 1333 case Opt_xprt_udp:
bf0fd768 1334 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1335 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1336 kfree(string);
bf0fd768 1337 break;
ee671b01
JL		 1338 case Opt_xprt_tcp6:
1339 protofamily = AF_INET6;
fdb66ff4 1340 case Opt_xprt_tcp:
bf0fd768 1341 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1342 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1343 kfree(string);
bf0fd768 1344 break;
2cf7ff7a
TT		 1345 case Opt_xprt_rdma:
1346 /* vector side protocols to TCP */
1347 mnt->flags |= NFS_MOUNT_TCP;
1348 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1349 xprt_load_transport(string);
d23c45fd 1350 kfree(string);
2cf7ff7a 1351 break;
bf0fd768 1352 default:
f45663ce
CL		 1353 dfprintk(MOUNT, "NFS: unrecognized "
1354 "transport protocol\n");
4223a4a1 1355 kfree(string);
d23c45fd 1356 return 0;
bf0fd768
CL		 1357 }
1358 break;
1359 case Opt_mountproto:
1360 string = match_strdup(args);
1361 if (string == NULL)
1362 goto out_nomem;
1363 token = match_token(string,
1364 nfs_xprt_protocol_tokens, args);
d508afb4 1365 kfree(string);
bf0fd768 1366
ee671b01 1367 mountfamily = AF_INET;
bf0fd768 1368 switch (token) {
ee671b01
JL		 1369 case Opt_xprt_udp6:
1370 mountfamily = AF_INET6;
fdb66ff4 1371 case Opt_xprt_udp:
0896a725 1372 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1373 break;
ee671b01
JL		 1374 case Opt_xprt_tcp6:
1375 mountfamily = AF_INET6;
fdb66ff4 1376 case Opt_xprt_tcp:
0896a725 1377 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1378 break;
2cf7ff7a 1379 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1380 default:
f45663ce
CL		 1381 dfprintk(MOUNT, "NFS: unrecognized "
1382 "transport protocol\n");
d23c45fd 1383 return 0;
bf0fd768
CL		 1384 }
1385 break;
1386 case Opt_addr:
1387 string = match_strdup(args);
1388 if (string == NULL)
1389 goto out_nomem;
53a0b9c4
CL		 1390 mnt->nfs_server.addrlen =
1391 rpc_pton(string, strlen(string),
1392 (struct sockaddr *)
1393 &mnt->nfs_server.address,
1394 sizeof(mnt->nfs_server.address));
bf0fd768 1395 kfree(string);
53a0b9c4
CL		 1396 if (mnt->nfs_server.addrlen == 0)
1397 goto out_invalid_address;
bf0fd768
CL		 1398 break;
1399 case Opt_clientaddr:
1400 string = match_strdup(args);
1401 if (string == NULL)
1402 goto out_nomem;
fc601477 1403 kfree(mnt->client_address);
bf0fd768
CL		 1404 mnt->client_address = string;
1405 break;
33832034
CL		 1406 case Opt_mounthost:
1407 string = match_strdup(args);
1408 if (string == NULL)
1409 goto out_nomem;
fc601477 1410 kfree(mnt->mount_server.hostname);
33832034
CL		 1411 mnt->mount_server.hostname = string;
1412 break;
0ac83779 1413 case Opt_mountaddr:
bf0fd768
CL		 1414 string = match_strdup(args);
1415 if (string == NULL)
1416 goto out_nomem;
53a0b9c4
CL		 1417 mnt->mount_server.addrlen =
1418 rpc_pton(string, strlen(string),
1419 (struct sockaddr *)
1420 &mnt->mount_server.address,
1421 sizeof(mnt->mount_server.address));
bf0fd768 1422 kfree(string);
53a0b9c4
CL		 1423 if (mnt->mount_server.addrlen == 0)
1424 goto out_invalid_address;
bf0fd768 1425 break;
7973c1f1
TM		 1426 case Opt_lookupcache:
1427 string = match_strdup(args);
1428 if (string == NULL)
1429 goto out_nomem;
1430 token = match_token(string,
1431 nfs_lookupcache_tokens, args);
1432 kfree(string);
1433 switch (token) {
1434 case Opt_lookupcache_all:
1435 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1436 break;
1437 case Opt_lookupcache_positive:
1438 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1439 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1440 break;
1441 case Opt_lookupcache_none:
1442 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1443 break;
1444 default:
7973c1f1
TM		 1445 dfprintk(MOUNT, "NFS: invalid "
1446 "lookupcache argument\n");
d23c45fd 1447 return 0;
7973c1f1
TM		 1448 };
1449 break;
a6d5ff64
CL		 1450 case Opt_fscache_uniq:
1451 string = match_strdup(args);
1452 if (string == NULL)
1453 goto out_nomem;
1454 kfree(mnt->fscache_uniq);
1455 mnt->fscache_uniq = string;
1456 mnt->options |= NFS_OPTION_FSCACHE;
1457 break;
5eebde23
SJ		 1458 case Opt_local_lock:
1459 string = match_strdup(args);
1460 if (string == NULL)
1461 goto out_nomem;
1462 token = match_token(string, nfs_local_lock_tokens,
1463 args);
1464 kfree(string);
1465 switch (token) {
1466 case Opt_local_lock_all:
1467 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1468 NFS_MOUNT_LOCAL_FCNTL);
1469 break;
1470 case Opt_local_lock_flock:
1471 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1472 break;
1473 case Opt_local_lock_posix:
1474 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1475 break;
1476 case Opt_local_lock_none:
1477 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1478 NFS_MOUNT_LOCAL_FCNTL);
1479 break;
1480 default:
1481 dfprintk(MOUNT, "NFS: invalid "
1482 "local_lock argument\n");
1483 return 0;
1484 };
1485 break;
bf0fd768 1486
f45663ce
CL		 1487 /*
1488 * Special options
1489 */
1490 case Opt_sloppy:
1491 sloppy = 1;
1492 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1493 break;
bf0fd768
CL		 1494 case Opt_userspace:
1495 case Opt_deprecated:
d33e4dfe
CL		 1496 dfprintk(MOUNT, "NFS: ignoring mount option "
1497 "'%s'\n", p);
bf0fd768
CL		 1498 break;
1499
1500 default:
d23c45fd 1501 invalid_option = 1;
f45663ce
CL		 1502 dfprintk(MOUNT, "NFS: unrecognized mount option "
1503 "'%s'\n", p);
bf0fd768
CL		 1504 }
1505 }
1506
d23c45fd
CL		 1507 if (!sloppy && invalid_option)
1508 return 0;
1509
ee671b01
JL		 1510 /*
1511 * verify that any proto=/mountproto= options match the address
1512 * familiies in the addr=/mountaddr= options.
1513 */
1514 if (protofamily != AF_UNSPEC &&
1515 protofamily != mnt->nfs_server.address.ss_family)
1516 goto out_proto_mismatch;
1517
1518 if (mountfamily != AF_UNSPEC) {
1519 if (mnt->mount_server.addrlen) {
1520 if (mountfamily != mnt->mount_server.address.ss_family)
1521 goto out_mountproto_mismatch;
1522 } else {
1523 if (mountfamily != mnt->nfs_server.address.ss_family)
1524 goto out_mountproto_mismatch;
1525 }
1526 }
1527
bf0fd768
CL		 1528 return 1;
1529
ee671b01
JL		 1530out_mountproto_mismatch:
1531 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1532 "option\n");
1533 return 0;
1534out_proto_mismatch:
1535 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1536 return 0;
53a0b9c4
CL		 1537out_invalid_address:
1538 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1539 return 0;
d23c45fd 1540out_invalid_value:
53a0b9c4 1541 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1542 return 0;
bf0fd768
CL		 1543out_nomem:
1544 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1545 return 0;
f9c3a380
EP		 1546out_security_failure:
1547 free_secdata(secdata);
1548 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1549 return 0;
bf0fd768
CL		 1550}
1551
ec88f28d
CL		 1552/*
1553 * Match the requested auth flavors with the list returned by
1554 * the server. Returns zero and sets the mount's authentication
1555 * flavor on success; returns -EACCES if server does not support
1556 * the requested flavor.
1557 */
1558static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1559 struct nfs_mount_request *request)
1560{
1561 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1562
5eecfde6
CL		 1563 /*
1564 * Certain releases of Linux's mountd return an empty
1565 * flavor list. To prevent behavioral regression with
1566 * these servers (ie. rejecting mounts that used to
1567 * succeed), revert to pre-2.6.32 behavior (no checking)
1568 * if the returned flavor list is empty.
1569 */
1570 if (server_authlist_len == 0)
1571 return 0;
1572
ec88f28d
CL		 1573 /*
1574 * We avoid sophisticated negotiating here, as there are
1575 * plenty of cases where we can get it wrong, providing
1576 * either too little or too much security.
1577 *
1578 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1579 * flavor listed first. However, some servers list
1580 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1581 * preferred default, in args->auth_flavors[0] if user
1582 * didn't specify sec= mount option.
1583 */
1584 for (i = 0; i < args->auth_flavor_len; i++)
1585 for (j = 0; j < server_authlist_len; j++)
1586 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1587 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1588 request->auth_flavs[j]);
1589 args->auth_flavors[0] = request->auth_flavs[j];
1590 return 0;
1591 }
1592
1593 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1594 nfs_umount(request);
1595 return -EACCES;
1596}
1597
0076d7b7
CL		 1598/*
1599 * Use the remote server's MOUNT service to request the NFS file handle
1600 * corresponding to the provided path.
1601 */
1602static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1603 struct nfs_fh *root_fh)
1604{
ec88f28d
CL		 1605 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1606 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1607 struct nfs_mount_request request = {
1608 .sap = (struct sockaddr *)
1609 &args->mount_server.address,
1610 .dirpath = args->nfs_server.export_path,
1611 .protocol = args->mount_server.protocol,
1612 .fh = root_fh,
50a737f8 1613 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1614 .auth_flav_len = &server_authlist_len,
1615 .auth_flavs = server_authlist,
c5d120f8 1616 };
4c568017 1617 int status;
0076d7b7
CL		 1618
1619 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1620 switch (args->version) {
1621 default:
1622 args->mount_server.version = NFS_MNT3_VERSION;
1623 break;
1624 case 2:
1625 args->mount_server.version = NFS_MNT_VERSION;
1626 }
0076d7b7 1627 }
c5d120f8 1628 request.version = args->mount_server.version;
0076d7b7 1629
33832034 1630 if (args->mount_server.hostname)
c5d120f8 1631 request.hostname = args->mount_server.hostname;
33832034 1632 else
c5d120f8 1633 request.hostname = args->nfs_server.hostname;
33832034 1634
0076d7b7
CL		 1635 /*
1636 * Construct the mount server's address.
1637 */
4c568017 1638 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1639 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1640 args->nfs_server.addrlen);
1641 args->mount_server.addrlen = args->nfs_server.addrlen;
1642 }
c5d120f8 1643 request.salen = args->mount_server.addrlen;
f5855fec 1644 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1645
1646 /*
1647 * Now ask the mount server to map our export path
1648 * to a file handle.
1649 */
c5d120f8 1650 status = nfs_mount(&request);
ec88f28d
CL		 1651 if (status != 0) {
1652 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1653 request.hostname, status);
1654 return status;
1655 }
0076d7b7 1656
ec88f28d
CL		 1657 /*
1658 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1659 */
1660 if (args->mount_server.version != NFS_MNT3_VERSION)
1661 return 0;
1662 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1663}
1664
d1aa0825
CL		 1665static int nfs_parse_simple_hostname(const char *dev_name,
1666 char **hostname, size_t maxnamlen,
1667 char **export_path, size_t maxpathlen)
dc045898
CL		 1668{
1669 size_t len;
1670 char *colon, *comma;
1671
1672 colon = strchr(dev_name, ':');
1673 if (colon == NULL)
1674 goto out_bad_devname;
1675
1676 len = colon - dev_name;
1677 if (len > maxnamlen)
1678 goto out_hostname;
1679
1680 /* N.B. caller will free nfs_server.hostname in all cases */
1681 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1682 if (!*hostname)
1683 goto out_nomem;
1684
1685 /* kill possible hostname list: not supported */
1686 comma = strchr(*hostname, ',');
1687 if (comma != NULL) {
1688 if (comma == *hostname)
1689 goto out_bad_devname;
1690 *comma = '\0';
1691 }
1692
1693 colon++;
1694 len = strlen(colon);
1695 if (len > maxpathlen)
1696 goto out_path;
1697 *export_path = kstrndup(colon, len, GFP_KERNEL);
1698 if (!*export_path)
1699 goto out_nomem;
1700
1701 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1702 return 0;
1703
1704out_bad_devname:
1705 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1706 return -EINVAL;
1707
1708out_nomem:
1709 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1710 return -ENOMEM;
1711
1712out_hostname:
1713 dfprintk(MOUNT, "NFS: server hostname too long\n");
1714 return -ENAMETOOLONG;
1715
1716out_path:
1717 dfprintk(MOUNT, "NFS: export pathname too long\n");
1718 return -ENAMETOOLONG;
1719}
1720
d1aa0825
CL		 1721/*
1722 * Hostname has square brackets around it because it contains one or
1723 * more colons. We look for the first closing square bracket, and a
1724 * colon must follow it.
1725 */
1726static int nfs_parse_protected_hostname(const char *dev_name,
1727 char **hostname, size_t maxnamlen,
1728 char **export_path, size_t maxpathlen)
1729{
1730 size_t len;
1731 char *start, *end;
1732
1733 start = (char *)(dev_name + 1);
1734
1735 end = strchr(start, ']');
1736 if (end == NULL)
1737 goto out_bad_devname;
1738 if (*(end + 1) != ':')
1739 goto out_bad_devname;
1740
1741 len = end - start;
1742 if (len > maxnamlen)
1743 goto out_hostname;
1744
1745 /* N.B. caller will free nfs_server.hostname in all cases */
1746 *hostname = kstrndup(start, len, GFP_KERNEL);
1747 if (*hostname == NULL)
1748 goto out_nomem;
1749
1750 end += 2;
1751 len = strlen(end);
1752 if (len > maxpathlen)
1753 goto out_path;
1754 *export_path = kstrndup(end, len, GFP_KERNEL);
1755 if (!*export_path)
1756 goto out_nomem;
1757
1758 return 0;
1759
1760out_bad_devname:
1761 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1762 return -EINVAL;
1763
1764out_nomem:
1765 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1766 return -ENOMEM;
1767
1768out_hostname:
1769 dfprintk(MOUNT, "NFS: server hostname too long\n");
1770 return -ENAMETOOLONG;
1771
1772out_path:
1773 dfprintk(MOUNT, "NFS: export pathname too long\n");
1774 return -ENAMETOOLONG;
1775}
1776
1777/*
1778 * Split "dev_name" into "hostname:export_path".
1779 *
1780 * The leftmost colon demarks the split between the server's hostname
1781 * and the export path. If the hostname starts with a left square
1782 * bracket, then it may contain colons.
1783 *
1784 * Note: caller frees hostname and export path, even on error.
1785 */
1786static int nfs_parse_devname(const char *dev_name,
1787 char **hostname, size_t maxnamlen,
1788 char **export_path, size_t maxpathlen)
1789{
1790 if (*dev_name == '[')
1791 return nfs_parse_protected_hostname(dev_name,
1792 hostname, maxnamlen,
1793 export_path, maxpathlen);
1794
1795 return nfs_parse_simple_hostname(dev_name,
1796 hostname, maxnamlen,
1797 export_path, maxpathlen);
1798}
1799
f7b422b1 1800/*
54ceac45
DH		 1801 * Validate the NFS2/NFS3 mount data
1802 * - fills in the mount root filehandle
136d558c
CL		 1803 *
1804 * For option strings, user space handles the following behaviors:
1805 *
1806 * + DNS: mapping server host name to IP address ("addr=" option)
1807 *
1808 * + failure mode: how to behave if a mount request can't be handled
1809 * immediately ("fg/bg" option)
1810 *
1811 * + retry: how often to retry a mount request ("retry=" option)
1812 *
1813 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1814 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1815 */
2283f8d6
TT		 1816static int nfs_validate_mount_data(void *options,
1817 struct nfs_parsed_mount_data *args,
136d558c
CL		 1818 struct nfs_fh *mntfh,
1819 const char *dev_name)
f7b422b1 1820{
2283f8d6 1821 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1822 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1823
5df36e78
CL		 1824 if (data == NULL)
1825 goto out_no_data;
f7b422b1 1826
54ceac45 1827 switch (data->version) {
5df36e78
CL		 1828 case 1:
1829 data->namlen = 0;
1830 case 2:
1831 data->bsize = 0;
1832 case 3:
1833 if (data->flags & NFS_MOUNT_VER3)
1834 goto out_no_v3;
1835 data->root.size = NFS2_FHSIZE;
1836 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1837 case 4:
1838 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1839 goto out_no_sec;
1840 case 5:
1841 memset(data->context, 0, sizeof(data->context));
1842 case 6:
b7e24457
TM		 1843 if (data->flags & NFS_MOUNT_VER3) {
1844 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1845 goto out_invalid_fh;
5df36e78 1846 mntfh->size = data->root.size;
764302cc
CL		 1847 args->version = 3;
1848 } else {
5df36e78 1849 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1850 args->version = 2;
1851 }
5df36e78 1852
5df36e78
CL		 1853
1854 memcpy(mntfh->data, data->root.data, mntfh->size);
1855 if (mntfh->size < sizeof(mntfh->data))
1856 memset(mntfh->data + mntfh->size, 0,
1857 sizeof(mntfh->data) - mntfh->size);
6e88e061 1858
2283f8d6
TT		 1859 /*
1860 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1861 * can deal with.
1862 */
ff3525a5 1863 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1864 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1865 args->rsize = data->rsize;
1866 args->wsize = data->wsize;
2283f8d6
TT		 1867 args->timeo = data->timeo;
1868 args->retrans = data->retrans;
1869 args->acregmin = data->acregmin;
1870 args->acregmax = data->acregmax;
1871 args->acdirmin = data->acdirmin;
1872 args->acdirmax = data->acdirmax;
4c568017 1873
4cfd74fc 1874 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1875 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1876 if (!nfs_verify_server_address(sap))
4c568017
CL		 1877 goto out_no_address;
1878
2283f8d6 1879 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1880 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1881 /* N.B. caller will free nfs_server.hostname in all cases */
1882 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1883 args->namlen = data->namlen;
1884 args->bsize = data->bsize;
dd07c947
CL		 1885
1886 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1887 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1888 if (!args->nfs_server.hostname)
1889 goto out_nomem;
f9c3a380 1890
5eebde23
SJ		 1891 if (!(data->flags & NFS_MOUNT_NONLM))
1892 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1893 NFS_MOUNT_LOCAL_FCNTL);
1894 else
1895 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1896 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1897 /*
1898 * The legacy version 6 binary mount data from userspace has a
1899 * field used only to transport selinux information into the
1900 * the kernel. To continue to support that functionality we
1901 * have a touch of selinux knowledge here in the NFS code. The
1902 * userspace code converted context=blah to just blah so we are
1903 * converting back to the full string selinux understands.
1904 */
1905 if (data->context[0]){
1906#ifdef CONFIG_SECURITY_SELINUX
1907 int rc;
1908 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1909 if (!opts_str)
1910 return -ENOMEM;
1911 strcpy(opts_str, "context=");
1912 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1913 strcat(opts_str, &data->context[0]);
1914 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1915 kfree(opts_str);
1916 if (rc)
1917 return rc;
1918#else
1919 return -EINVAL;
1920#endif
1921 }
1922
5df36e78 1923 break;
136d558c 1924 default: {
136d558c 1925 int status;
136d558c 1926
2283f8d6
TT		 1927 if (nfs_parse_mount_options((char *)options, args) == 0)
1928 return -EINVAL;
136d558c 1929
4cfd74fc 1930 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1931 goto out_no_address;
1932
764302cc
CL		 1933 if (args->version == 4)
1934#ifdef CONFIG_NFS_V4
1935 return nfs4_validate_text_mount_data(options,
1936 args, dev_name);
1937#else
1938 goto out_v4_not_compiled;
1939#endif
1940
f5855fec 1941 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1942
259875ef
TM		 1943 nfs_set_mount_transport_protocol(args);
1944
dc045898
CL		 1945 status = nfs_parse_devname(dev_name,
1946 &args->nfs_server.hostname,
1947 PAGE_SIZE,
1948 &args->nfs_server.export_path,
1949 NFS_MAXPATHLEN);
1950 if (!status)
1951 status = nfs_try_mount(args, mntfh);
136d558c 1952
dc045898
CL		 1953 kfree(args->nfs_server.export_path);
1954 args->nfs_server.export_path = NULL;
136d558c 1955
136d558c 1956 if (status)
fdc6e2c8 1957 return status;
136d558c 1958
136d558c
CL		 1959 break;
1960 }
f7b422b1 1961 }
54ceac45
DH		 1962
1963#ifndef CONFIG_NFS_V3
8a6e5deb 1964 if (args->version == 3)
5df36e78
CL		 1965 goto out_v3_not_compiled;
1966#endif /* !CONFIG_NFS_V3 */
f7b422b1 1967
5df36e78 1968 return 0;
f7b422b1 1969
5df36e78
CL		 1970out_no_data:
1971 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1972 return -EINVAL;
54ceac45 1973
5df36e78
CL		 1974out_no_v3:
1975 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1976 data->version);
1977 return -EINVAL;
f7b422b1 1978
5df36e78
CL		 1979out_no_sec:
1980 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1981 return -EINVAL;
1982
5df36e78
CL		 1983#ifndef CONFIG_NFS_V3
1984out_v3_not_compiled:
1985 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1986 return -EPROTONOSUPPORT;
1987#endif /* !CONFIG_NFS_V3 */
1988
764302cc
CL		 1989#ifndef CONFIG_NFS_V4
1990out_v4_not_compiled:
1991 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1992 return -EPROTONOSUPPORT;
1993#endif /* !CONFIG_NFS_V4 */
1994
63649bd7
CG		 1995out_nomem:
1996 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1997 return -ENOMEM;
1998
5df36e78
CL		 1999out_no_address:
2000 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2001 return -EINVAL;
2002
2003out_invalid_fh:
2004 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2005 return -EINVAL;
f7b422b1
DH		 2006}
2007
48b605f8
JL		 2008static int
2009nfs_compare_remount_data(struct nfs_server *nfss,
2010 struct nfs_parsed_mount_data *data)
2011{
2012 if (data->flags != nfss->flags ||
2013 data->rsize != nfss->rsize ||
2014 data->wsize != nfss->wsize ||
2015 data->retrans != nfss->client->cl_timeout->to_retries ||
2016 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2017 data->acregmin != nfss->acregmin / HZ ||
2018 data->acregmax != nfss->acregmax / HZ ||
2019 data->acdirmin != nfss->acdirmin / HZ ||
2020 data->acdirmax != nfss->acdirmax / HZ ||
2021 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2022 data->nfs_server.port != nfss->port ||
48b605f8 2023 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2024 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2025 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2026 return -EINVAL;
2027
2028 return 0;
2029}
2030
2031static int
2032nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2033{
2034 int error;
2035 struct nfs_server *nfss = sb->s_fs_info;
2036 struct nfs_parsed_mount_data *data;
2037 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2038 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2039 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2040
2041 /*
2042 * Userspace mount programs that send binary options generally send
2043 * them populated with default values. We have no way to know which
2044 * ones were explicitly specified. Fall back to legacy behavior and
2045 * just return success.
2046 */
31c94469
MZ		 2047 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2048 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2049 options->version <= 6))))
48b605f8
JL		 2050 return 0;
2051
2052 data = kzalloc(sizeof(*data), GFP_KERNEL);
2053 if (data == NULL)
2054 return -ENOMEM;
2055
2056 /* fill out struct with values from existing mount */
2057 data->flags = nfss->flags;
2058 data->rsize = nfss->rsize;
2059 data->wsize = nfss->wsize;
2060 data->retrans = nfss->client->cl_timeout->to_retries;
2061 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2062 data->acregmin = nfss->acregmin / HZ;
2063 data->acregmax = nfss->acregmax / HZ;
2064 data->acdirmin = nfss->acdirmin / HZ;
2065 data->acdirmax = nfss->acdirmax / HZ;
2066 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2067 data->nfs_server.port = nfss->port;
48b605f8
JL		 2068 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2069 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2070 data->nfs_server.addrlen);
2071
2072 /* overwrite those values with any that were specified */
2073 error = nfs_parse_mount_options((char *)options, data);
2074 if (error < 0)
2075 goto out;
2076
2077 /* compare new mount options with old ones */
2078 error = nfs_compare_remount_data(nfss, data);
2079out:
2080 kfree(data);
2081 return error;
2082}
2083
f7b422b1 2084/*
54ceac45 2085 * Initialise the common bits of the superblock
f7b422b1 2086 */
54ceac45 2087static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2088{
54ceac45 2089 struct nfs_server *server = NFS_SB(sb);
5006a76c 2090
54ceac45 2091 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2092
54ceac45
DH		 2093 /* We probably want something more informative here */
2094 snprintf(sb->s_id, sizeof(sb->s_id),
2095 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2096
54ceac45
DH		 2097 if (sb->s_blocksize == 0)
2098 sb->s_blocksize = nfs_block_bits(server->wsize,
2099 &sb->s_blocksize_bits);
f7b422b1 2100
54ceac45
DH		 2101 if (server->flags & NFS_MOUNT_NOAC)
2102 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 2103
32a88aa1
JA		 2104 sb->s_bdi = &server->backing_dev_info;
2105
54ceac45 2106 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2107}
2108
2109/*
54ceac45 2110 * Finish setting up an NFS2/3 superblock
f7b422b1 2111 */
2283f8d6
TT		 2112static void nfs_fill_super(struct super_block *sb,
2113 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2114{
2115 struct nfs_server *server = NFS_SB(sb);
5006a76c 2116
54ceac45
DH		 2117 sb->s_blocksize_bits = 0;
2118 sb->s_blocksize = 0;
2119 if (data->bsize)
2120 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2121
8a6e5deb 2122 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2123 /* The VFS shouldn't apply the umask to mode bits. We will do
2124 * so ourselves when necessary.
2125 */
2126 sb->s_flags |= MS_POSIXACL;
2127 sb->s_time_gran = 1;
816724e6 2128 }
54ceac45
DH		 2129
2130 sb->s_op = &nfs_sops;
2131 nfs_initialise_sb(sb);
f7b422b1
DH		 2132}
2133
2134/*
54ceac45 2135 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2136 */
54ceac45
DH		 2137static void nfs_clone_super(struct super_block *sb,
2138 const struct super_block *old_sb)
f7b422b1 2139{
54ceac45
DH		 2140 struct nfs_server *server = NFS_SB(sb);
2141
2142 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2143 sb->s_blocksize = old_sb->s_blocksize;
2144 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2145
8a6e5deb 2146 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2147 /* The VFS shouldn't apply the umask to mode bits. We will do
2148 * so ourselves when necessary.
f7b422b1
DH		 2149 */
2150 sb->s_flags |= MS_POSIXACL;
f7b422b1 2151 sb->s_time_gran = 1;
f7b422b1
DH		 2152 }
2153
54ceac45
DH		 2154 sb->s_op = old_sb->s_op;
2155 nfs_initialise_sb(sb);
f7b422b1
DH		 2156}
2157
275a5d24
TM		 2158static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2159{
2160 const struct nfs_server *a = s->s_fs_info;
2161 const struct rpc_clnt *clnt_a = a->client;
2162 const struct rpc_clnt *clnt_b = b->client;
2163
2164 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2165 goto Ebusy;
2166 if (a->nfs_client != b->nfs_client)
2167 goto Ebusy;
2168 if (a->flags != b->flags)
2169 goto Ebusy;
2170 if (a->wsize != b->wsize)
2171 goto Ebusy;
2172 if (a->rsize != b->rsize)
2173 goto Ebusy;
2174 if (a->acregmin != b->acregmin)
2175 goto Ebusy;
2176 if (a->acregmax != b->acregmax)
2177 goto Ebusy;
2178 if (a->acdirmin != b->acdirmin)
2179 goto Ebusy;
2180 if (a->acdirmax != b->acdirmax)
2181 goto Ebusy;
2182 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2183 goto Ebusy;
e89a5a43 2184 return 1;
275a5d24 2185Ebusy:
e89a5a43
TM		 2186 return 0;
2187}
2188
2189struct nfs_sb_mountdata {
2190 struct nfs_server *server;
2191 int mntflags;
2192};
2193
2194static int nfs_set_super(struct super_block *s, void *data)
2195{
2196 struct nfs_sb_mountdata *sb_mntdata = data;
2197 struct nfs_server *server = sb_mntdata->server;
2198 int ret;
2199
2200 s->s_flags = sb_mntdata->mntflags;
2201 s->s_fs_info = server;
2202 ret = set_anon_super(s, server);
2203 if (ret == 0)
2204 server->s_dev = s->s_dev;
2205 return ret;
2206}
2207
fd00a8ff
CL		 2208static int nfs_compare_super_address(struct nfs_server *server1,
2209 struct nfs_server *server2)
2210{
2211 struct sockaddr *sap1, *sap2;
2212
2213 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2214 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2215
2216 if (sap1->sa_family != sap2->sa_family)
2217 return 0;
2218
2219 switch (sap1->sa_family) {
2220 case AF_INET: {
2221 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2222 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2223 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2224 return 0;
2225 if (sin1->sin_port != sin2->sin_port)
2226 return 0;
2227 break;
2228 }
2229 case AF_INET6: {
2230 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2231 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2232 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2233 return 0;
2234 if (sin1->sin6_port != sin2->sin6_port)
2235 return 0;
2236 break;
2237 }
2238 default:
2239 return 0;
2240 }
2241
2242 return 1;
2243}
2244
e89a5a43
TM		 2245static int nfs_compare_super(struct super_block *sb, void *data)
2246{
2247 struct nfs_sb_mountdata *sb_mntdata = data;
2248 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2249 int mntflags = sb_mntdata->mntflags;
2250
fd00a8ff 2251 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2252 return 0;
2253 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2254 if (old->flags & NFS_MOUNT_UNSHARED)
2255 return 0;
2256 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2257 return 0;
2258 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2259}
2260
fa799759
MS		 2261static int nfs_bdi_register(struct nfs_server *server)
2262{
2263 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2264}
2265
816724e6
TM		 2266static int nfs_get_sb(struct file_system_type *fs_type,
2267 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2268{
f7b422b1
DH		 2269 struct nfs_server *server = NULL;
2270 struct super_block *s;
33852a1f
TM		 2271 struct nfs_parsed_mount_data *data;
2272 struct nfs_fh *mntfh;
54ceac45 2273 struct dentry *mntroot;
75180df2 2274 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2275 struct nfs_sb_mountdata sb_mntdata = {
2276 .mntflags = flags,
2277 };
33852a1f
TM		 2278 int error = -ENOMEM;
2279
c5811dbd 2280 data = nfs_alloc_parsed_mount_data(3);
b157b06c 2281 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2282 if (data == NULL || mntfh == NULL)
2283 goto out_free_fh;
f7b422b1 2284
33852a1f 2285 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2286
54ceac45 2287 /* Validate the mount data */
33852a1f 2288 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2289 if (error < 0)
0655960f 2290 goto out;
f7b422b1 2291
764302cc
CL		 2292#ifdef CONFIG_NFS_V4
2293 if (data->version == 4) {
2294 error = nfs4_try_mount(flags, dev_name, data, mnt);
2295 kfree(data->client_address);
9699eda6 2296 kfree(data->nfs_server.export_path);
764302cc
CL		 2297 goto out;
2298 }
2299#endif /* CONFIG_NFS_V4 */
2300
54ceac45 2301 /* Get a volume representation */
33852a1f 2302 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2303 if (IS_ERR(server)) {
2304 error = PTR_ERR(server);
0655960f 2305 goto out;
f7b422b1 2306 }
e89a5a43 2307 sb_mntdata.server = server;
f7b422b1 2308
75180df2
TM		 2309 if (server->flags & NFS_MOUNT_UNSHARED)
2310 compare_super = NULL;
2311
54ceac45 2312 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2313 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2314 if (IS_ERR(s)) {
2315 error = PTR_ERR(s);
54ceac45 2316 goto out_err_nosb;
816724e6
TM		 2317 }
2318
54ceac45
DH		 2319 if (s->s_fs_info != server) {
2320 nfs_free_server(server);
2321 server = NULL;
fa799759
MS		 2322 } else {
2323 error = nfs_bdi_register(server);
2324 if (error)
cfbc0683 2325 goto error_splat_bdi;
54ceac45 2326 }
f7b422b1 2327
54ceac45
DH		 2328 if (!s->s_root) {
2329 /* initial superblock/root creation */
33852a1f 2330 nfs_fill_super(s, data);
2df54806
DH		 2331 nfs_fscache_get_super_cookie(
2332 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2333 }
f7b422b1 2334
33852a1f 2335 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2336 if (IS_ERR(mntroot)) {
2337 error = PTR_ERR(mntroot);
2338 goto error_splat_super;
f7b422b1 2339 }
816724e6 2340
33852a1f 2341 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2342 if (error)
2343 goto error_splat_root;
2344
54ceac45
DH		 2345 s->s_flags |= MS_ACTIVE;
2346 mnt->mnt_sb = s;
2347 mnt->mnt_root = mntroot;
0655960f
CL		 2348 error = 0;
2349
2350out:
33852a1f
TM		 2351 kfree(data->nfs_server.hostname);
2352 kfree(data->mount_server.hostname);
08734048 2353 kfree(data->fscache_uniq);
33852a1f
TM		 2354 security_free_mnt_opts(&data->lsm_opts);
2355out_free_fh:
b157b06c 2356 nfs_free_fhandle(mntfh);
33852a1f 2357 kfree(data);
0655960f 2358 return error;
816724e6 2359
54ceac45
DH		 2360out_err_nosb:
2361 nfs_free_server(server);
0655960f 2362 goto out;
54ceac45 2363
f9c3a380
EP		 2364error_splat_root:
2365 dput(mntroot);
54ceac45 2366error_splat_super:
cfbc0683
N		 2367 if (server && !s->s_root)
2368 bdi_unregister(&server->backing_dev_info);
2369error_splat_bdi:
6f5bbff9 2370 deactivate_locked_super(s);
0655960f 2371 goto out;
f7b422b1
DH		 2372}
2373
387c149b
TM		 2374/*
2375 * Ensure that we unregister the bdi before kill_anon_super
2376 * releases the device name
2377 */
2378static void nfs_put_super(struct super_block *s)
2379{
2380 struct nfs_server *server = NFS_SB(s);
2381
2382 bdi_unregister(&server->backing_dev_info);
2383}
2384
54ceac45
DH		 2385/*
2386 * Destroy an NFS2/3 superblock
2387 */
f7b422b1
DH		 2388static void nfs_kill_super(struct super_block *s)
2389{
2390 struct nfs_server *server = NFS_SB(s);
2391
2392 kill_anon_super(s);
08734048 2393 nfs_fscache_release_super_cookie(s);
54ceac45 2394 nfs_free_server(server);
f7b422b1
DH		 2395}
2396
54ceac45
DH		 2397/*
2398 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2399 */
31f43471
AV		 2400static struct dentry *
2401nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2402 const char *dev_name, void *raw_data)
f7b422b1
DH		 2403{
2404 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2405 struct super_block *s;
2406 struct nfs_server *server;
2407 struct dentry *mntroot;
75180df2 2408 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2409 struct nfs_sb_mountdata sb_mntdata = {
2410 .mntflags = flags,
2411 };
54ceac45 2412 int error;
f7b422b1 2413
31f43471 2414 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2415
54ceac45
DH		 2416 /* create a new volume representation */
2417 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2418 if (IS_ERR(server)) {
2419 error = PTR_ERR(server);
2420 goto out_err_noserver;
2421 }
e89a5a43 2422 sb_mntdata.server = server;
8fa5c000 2423
75180df2
TM		 2424 if (server->flags & NFS_MOUNT_UNSHARED)
2425 compare_super = NULL;
2426
54ceac45 2427 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2428 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2429 if (IS_ERR(s)) {
2430 error = PTR_ERR(s);
2431 goto out_err_nosb;
2432 }
5006a76c 2433
54ceac45
DH		 2434 if (s->s_fs_info != server) {
2435 nfs_free_server(server);
2436 server = NULL;
fa799759
MS		 2437 } else {
2438 error = nfs_bdi_register(server);
2439 if (error)
cfbc0683 2440 goto error_splat_bdi;
f7b422b1 2441 }
24c8dbbb 2442
54ceac45
DH		 2443 if (!s->s_root) {
2444 /* initial superblock/root creation */
54ceac45 2445 nfs_clone_super(s, data->sb);
2df54806 2446 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2447 }
f7b422b1 2448
54ceac45
DH		 2449 mntroot = nfs_get_root(s, data->fh);
2450 if (IS_ERR(mntroot)) {
2451 error = PTR_ERR(mntroot);
2452 goto error_splat_super;
f7b422b1 2453 }
e9cc6c23 2454 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2455 dput(mntroot);
2456 error = -ESTALE;
2457 goto error_splat_super;
2458 }
f7b422b1 2459
54ceac45 2460 s->s_flags |= MS_ACTIVE;
f7b422b1 2461
f9c3a380
EP		 2462 /* clone any lsm security options from the parent to the new sb */
2463 security_sb_clone_mnt_opts(data->sb, s);
2464
31f43471
AV		 2465 dprintk("<-- nfs_xdev_mount() = 0\n");
2466 return mntroot;
24c8dbbb 2467
54ceac45
DH		 2468out_err_nosb:
2469 nfs_free_server(server);
2470out_err_noserver:
31f43471
AV		 2471 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2472 return ERR_PTR(error);
f7b422b1 2473
54ceac45 2474error_splat_super:
cfbc0683
N		 2475 if (server && !s->s_root)
2476 bdi_unregister(&server->backing_dev_info);
2477error_splat_bdi:
6f5bbff9 2478 deactivate_locked_super(s);
31f43471
AV		 2479 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2480 return ERR_PTR(error);
f7b422b1
DH		 2481}
2482
54ceac45
DH		 2483#ifdef CONFIG_NFS_V4
2484
f7b422b1 2485/*
54ceac45 2486 * Finish setting up a cloned NFS4 superblock
f7b422b1 2487 */
54ceac45
DH		 2488static void nfs4_clone_super(struct super_block *sb,
2489 const struct super_block *old_sb)
f7b422b1 2490{
54ceac45
DH		 2491 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2492 sb->s_blocksize = old_sb->s_blocksize;
2493 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2494 sb->s_time_gran = 1;
54ceac45
DH		 2495 sb->s_op = old_sb->s_op;
2496 nfs_initialise_sb(sb);
f7b422b1
DH		 2497}
2498
54ceac45
DH		 2499/*
2500 * Set up an NFS4 superblock
2501 */
2502static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2503{
54ceac45
DH		 2504 sb->s_time_gran = 1;
2505 sb->s_op = &nfs4_sops;
2506 nfs_initialise_sb(sb);
f7b422b1
DH		 2507}
2508
01c3f052
TM		 2509static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2510{
5eebde23
SJ		 2511 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2512 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2513}
2514
7630c852
CL		 2515static int nfs4_validate_text_mount_data(void *options,
2516 struct nfs_parsed_mount_data *args,
2517 const char *dev_name)
2518{
2519 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2520
f5855fec 2521 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2522
2523 nfs_validate_transport_protocol(args);
2524
2525 nfs4_validate_mount_flags(args);
2526
2ecda72b
TM		 2527 if (args->version != 4) {
2528 dfprintk(MOUNT,
2529 "NFS4: Illegal mount version\n");
2530 return -EINVAL;
2531 }
2532
7630c852
CL		 2533 if (args->auth_flavor_len > 1) {
2534 dfprintk(MOUNT,
2535 "NFS4: Too many RPC auth flavours specified\n");
2536 return -EINVAL;
2537 }
2538
2539 if (args->client_address == NULL) {
2540 dfprintk(MOUNT,
2541 "NFS4: mount program didn't pass callback address\n");
2542 return -EINVAL;
2543 }
2544
2545 return nfs_parse_devname(dev_name,
2546 &args->nfs_server.hostname,
2547 NFS4_MAXNAMLEN,
2548 &args->nfs_server.export_path,
2549 NFS4_MAXPATHLEN);
2550}
2551
f0768ebd
CL		 2552/*
2553 * Validate NFSv4 mount options
2554 */
91ea40b9
TT		 2555static int nfs4_validate_mount_data(void *options,
2556 struct nfs_parsed_mount_data *args,
2557 const char *dev_name)
f0768ebd 2558{
4cfd74fc 2559 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2560 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2561 char *c;
2562
2563 if (data == NULL)
2564 goto out_no_data;
2565
2566 switch (data->version) {
2567 case 1:
4c568017
CL		 2568 if (data->host_addrlen > sizeof(args->nfs_server.address))
2569 goto out_no_address;
2570 if (data->host_addrlen == 0)
f0768ebd 2571 goto out_no_address;
4c568017 2572 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2573 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2574 return -EFAULT;
4cfd74fc 2575 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2576 goto out_no_address;
2577
6738b251
CL		 2578 if (data->auth_flavourlen) {
2579 if (data->auth_flavourlen > 1)
2580 goto out_inval_auth;
20c71f5e 2581 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2582 data->auth_flavours,
20c71f5e 2583 sizeof(args->auth_flavors[0])))
f0768ebd 2584 return -EFAULT;
f0768ebd
CL		 2585 }
2586
2587 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2588 if (IS_ERR(c))
2589 return PTR_ERR(c);
91ea40b9 2590 args->nfs_server.hostname = c;
f0768ebd
CL		 2591
2592 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2593 if (IS_ERR(c))
2594 return PTR_ERR(c);
91ea40b9
TT		 2595 args->nfs_server.export_path = c;
2596 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2597
2598 c = strndup_user(data->client_addr.data, 16);
2599 if (IS_ERR(c))
2600 return PTR_ERR(c);
91ea40b9
TT		 2601 args->client_address = c;
2602
2603 /*
2604 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2605 * can deal with.
2606 */
2607
2608 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2609 args->rsize = data->rsize;
2610 args->wsize = data->wsize;
2611 args->timeo = data->timeo;
2612 args->retrans = data->retrans;
2613 args->acregmin = data->acregmin;
2614 args->acregmax = data->acregmax;
2615 args->acdirmin = data->acdirmin;
2616 args->acdirmax = data->acdirmax;
2617 args->nfs_server.protocol = data->proto;
259875ef 2618 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2619
2620 break;
7630c852 2621 default:
91ea40b9 2622 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2623 return -EINVAL;
2624
4cfd74fc 2625 if (!nfs_verify_server_address(sap))
80071225 2626 return -EINVAL;
dc045898 2627
7630c852 2628 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2629 }
2630
2631 return 0;
2632
2633out_no_data:
2634 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2635 return -EINVAL;
2636
2637out_inval_auth:
2638 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2639 data->auth_flavourlen);
2640 return -EINVAL;
2641
2642out_no_address:
2643 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2644 return -EINVAL;
f0768ebd
CL		 2645}
2646
54ceac45 2647/*
c02d7adf 2648 * Get the superblock for the NFS4 root partition
54ceac45 2649 */
31f43471
AV		 2650static struct dentry *
2651nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2652 const char *dev_name, void *raw_data)
f7b422b1 2653{
c02d7adf 2654 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2655 struct super_block *s;
2656 struct nfs_server *server;
33852a1f 2657 struct nfs_fh *mntfh;
54ceac45 2658 struct dentry *mntroot;
75180df2 2659 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2660 struct nfs_sb_mountdata sb_mntdata = {
2661 .mntflags = flags,
2662 };
33852a1f
TM		 2663 int error = -ENOMEM;
2664
b157b06c 2665 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2666 if (data == NULL || mntfh == NULL)
2667 goto out_free_fh;
f7b422b1 2668
33852a1f 2669 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2670
54ceac45 2671 /* Get a volume representation */
33852a1f 2672 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2673 if (IS_ERR(server)) {
2674 error = PTR_ERR(server);
29eb981a 2675 goto out;
f7b422b1 2676 }
e89a5a43 2677 sb_mntdata.server = server;
f7b422b1 2678
75180df2
TM		 2679 if (server->flags & NFS4_MOUNT_UNSHARED)
2680 compare_super = NULL;
2681
54ceac45 2682 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2683 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2684 if (IS_ERR(s)) {
2685 error = PTR_ERR(s);
f7b422b1 2686 goto out_free;
816724e6
TM		 2687 }
2688
5dd3177a
TM		 2689 if (s->s_fs_info != server) {
2690 nfs_free_server(server);
2691 server = NULL;
fa799759
MS		 2692 } else {
2693 error = nfs_bdi_register(server);
2694 if (error)
cfbc0683 2695 goto error_splat_bdi;
5dd3177a
TM		 2696 }
2697
54ceac45
DH		 2698 if (!s->s_root) {
2699 /* initial superblock/root creation */
54ceac45 2700 nfs4_fill_super(s);
2df54806
DH		 2701 nfs_fscache_get_super_cookie(
2702 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2703 }
f7b422b1 2704
33852a1f 2705 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2706 if (IS_ERR(mntroot)) {
2707 error = PTR_ERR(mntroot);
2708 goto error_splat_super;
f7b422b1 2709 }
54ceac45 2710
33852a1f 2711 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2712 if (error)
2713 goto error_splat_root;
2714
f7b422b1 2715 s->s_flags |= MS_ACTIVE;
31f43471
AV		 2716
2717 security_free_mnt_opts(&data->lsm_opts);
2718 nfs_free_fhandle(mntfh);
2719 return mntroot;
29eb981a
CL		 2720
2721out:
33852a1f
TM		 2722 security_free_mnt_opts(&data->lsm_opts);
2723out_free_fh:
b157b06c 2724 nfs_free_fhandle(mntfh);
31f43471 2725 return ERR_PTR(error);
54ceac45 2726
f7b422b1 2727out_free:
54ceac45 2728 nfs_free_server(server);
29eb981a 2729 goto out;
54ceac45 2730
46c8ac74
EP		 2731error_splat_root:
2732 dput(mntroot);
54ceac45 2733error_splat_super:
cfbc0683
N		 2734 if (server && !s->s_root)
2735 bdi_unregister(&server->backing_dev_info);
2736error_splat_bdi:
6f5bbff9 2737 deactivate_locked_super(s);
29eb981a 2738 goto out;
f7b422b1
DH		 2739}
2740
c02d7adf
TM		 2741static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2742 int flags, void *data, const char *hostname)
2743{
2744 struct vfsmount *root_mnt;
2745 char *root_devname;
2746 size_t len;
2747
2748 len = strlen(hostname) + 3;
2749 root_devname = kmalloc(len, GFP_KERNEL);
2750 if (root_devname == NULL)
2751 return ERR_PTR(-ENOMEM);
2752 snprintf(root_devname, len, "%s:/", hostname);
2753 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2754 kfree(root_devname);
2755 return root_mnt;
2756}
2757
b88f8a54
TM		 2758static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2759{
2760 char *page = (char *) __get_free_page(GFP_KERNEL);
2761 char *devname, *tmp;
2762
2763 if (page == NULL)
2764 return;
2765 devname = nfs_path(path->mnt->mnt_devname,
2766 path->mnt->mnt_root, path->dentry,
2767 page, PAGE_SIZE);
cdd29ecf 2768 if (IS_ERR(devname))
b88f8a54
TM		 2769 goto out_freepage;
2770 tmp = kstrdup(devname, GFP_KERNEL);
2771 if (tmp == NULL)
2772 goto out_freepage;
2773 kfree(mnt->mnt_devname);
2774 mnt->mnt_devname = tmp;
2775out_freepage:
2776 free_page((unsigned long)page);
2777}
2778
ce587e07
TM		 2779struct nfs_referral_count {
2780 struct list_head list;
2781 const struct task_struct *task;
2782 unsigned int referral_count;
2783};
2784
2785static LIST_HEAD(nfs_referral_count_list);
2786static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2787
2788static struct nfs_referral_count *nfs_find_referral_count(void)
2789{
2790 struct nfs_referral_count *p;
2791
2792 list_for_each_entry(p, &nfs_referral_count_list, list) {
2793 if (p->task == current)
2794 return p;
2795 }
2796 return NULL;
2797}
2798
2799#define NFS_MAX_NESTED_REFERRALS 2
2800
2801static int nfs_referral_loop_protect(void)
2802{
2803 struct nfs_referral_count *p, *new;
2804 int ret = -ENOMEM;
2805
2806 new = kmalloc(sizeof(*new), GFP_KERNEL);
2807 if (!new)
2808 goto out;
2809 new->task = current;
2810 new->referral_count = 1;
2811
2812 ret = 0;
2813 spin_lock(&nfs_referral_count_list_lock);
2814 p = nfs_find_referral_count();
2815 if (p != NULL) {
2816 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2817 ret = -ELOOP;
2818 else
2819 p->referral_count++;
2820 } else {
2821 list_add(&new->list, &nfs_referral_count_list);
2822 new = NULL;
2823 }
2824 spin_unlock(&nfs_referral_count_list_lock);
2825 kfree(new);
2826out:
2827 return ret;
2828}
2829
2830static void nfs_referral_loop_unprotect(void)
2831{
2832 struct nfs_referral_count *p;
2833
2834 spin_lock(&nfs_referral_count_list_lock);
2835 p = nfs_find_referral_count();
2836 p->referral_count--;
2837 if (p->referral_count == 0)
2838 list_del(&p->list);
2839 else
2840 p = NULL;
2841 spin_unlock(&nfs_referral_count_list_lock);
2842 kfree(p);
2843}
2844
c02d7adf
TM		 2845static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2846 const char *export_path, struct vfsmount *mnt_target)
2847{
04ffdbe2 2848 struct nameidata *nd = NULL;
a2770d86 2849 struct mnt_namespace *ns_private;
c02d7adf
TM		 2850 struct super_block *s;
2851 int ret;
2852
04ffdbe2
TM		 2853 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2854 if (nd == NULL)
2855 return -ENOMEM;
2856
a2770d86
LT		 2857 ns_private = create_mnt_ns(root_mnt);
2858 ret = PTR_ERR(ns_private);
2859 if (IS_ERR(ns_private))
2860 goto out_mntput;
2861
ce587e07
TM		 2862 ret = nfs_referral_loop_protect();
2863 if (ret != 0)
2864 goto out_put_mnt_ns;
2865
c02d7adf 2866 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
04ffdbe2 2867 export_path, LOOKUP_FOLLOW, nd);
c02d7adf 2868
ce587e07 2869 nfs_referral_loop_unprotect();
a2770d86
LT		 2870 put_mnt_ns(ns_private);
2871
c02d7adf
TM		 2872 if (ret != 0)
2873 goto out_err;
2874
04ffdbe2 2875 s = nd->path.mnt->mnt_sb;
c02d7adf
TM		 2876 atomic_inc(&s->s_active);
2877 mnt_target->mnt_sb = s;
04ffdbe2 2878 mnt_target->mnt_root = dget(nd->path.dentry);
c02d7adf 2879
b88f8a54 2880 /* Correct the device pathname */
04ffdbe2 2881 nfs_fix_devname(&nd->path, mnt_target);
b88f8a54 2882
04ffdbe2
TM		 2883 path_put(&nd->path);
2884 kfree(nd);
c02d7adf
TM		 2885 down_write(&s->s_umount);
2886 return 0;
ce587e07
TM		 2887out_put_mnt_ns:
2888 put_mnt_ns(ns_private);
c02d7adf
TM		 2889out_mntput:
2890 mntput(root_mnt);
2891out_err:
04ffdbe2 2892 kfree(nd);
c02d7adf
TM		 2893 return ret;
2894}
2895
a6fe23be
CL		 2896static int nfs4_try_mount(int flags, const char *dev_name,
2897 struct nfs_parsed_mount_data *data,
2898 struct vfsmount *mnt)
2899{
2900 char *export_path;
2901 struct vfsmount *root_mnt;
2902 int error;
2903
2904 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2905
2906 export_path = data->nfs_server.export_path;
2907 data->nfs_server.export_path = "/";
2908 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2909 data->nfs_server.hostname);
2910 data->nfs_server.export_path = export_path;
2911
2912 error = PTR_ERR(root_mnt);
2913 if (IS_ERR(root_mnt))
2914 goto out;
2915
2916 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2917
2918out:
2919 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2920 error != 0 ? " [error]" : "");
2921 return error;
2922}
2923
c02d7adf
TM		 2924/*
2925 * Get the superblock for an NFS4 mountpoint
2926 */
2927static int nfs4_get_sb(struct file_system_type *fs_type,
2928 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2929{
2930 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2931 int error = -ENOMEM;
2932
c5811dbd 2933 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2934 if (data == NULL)
2935 goto out_free_data;
2936
2937 /* Validate the mount data */
2938 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2939 if (error < 0)
2940 goto out;
2941
a6fe23be 2942 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2943
2944out:
2945 kfree(data->client_address);
2946 kfree(data->nfs_server.export_path);
2947 kfree(data->nfs_server.hostname);
2948 kfree(data->fscache_uniq);
2949out_free_data:
2950 kfree(data);
2951 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2952 error != 0 ? " [error]" : "");
2953 return error;
2954}
2955
f7b422b1
DH		 2956static void nfs4_kill_super(struct super_block *sb)
2957{
2958 struct nfs_server *server = NFS_SB(sb);
2959
0f3e66c6 2960 dprintk("--> %s\n", __func__);
515d8611 2961 nfs_super_return_all_delegations(sb);
f7b422b1 2962 kill_anon_super(sb);
08734048 2963 nfs_fscache_release_super_cookie(sb);
54ceac45 2964 nfs_free_server(server);
0f3e66c6 2965 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2966}
2967
2968/*
54ceac45 2969 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2970 */
31f43471
AV		 2971static struct dentry *
2972nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2973 const char *dev_name, void *raw_data)
f7b422b1 2974{
54ceac45
DH		 2975 struct nfs_clone_mount *data = raw_data;
2976 struct super_block *s;
2977 struct nfs_server *server;
2978 struct dentry *mntroot;
75180df2 2979 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2980 struct nfs_sb_mountdata sb_mntdata = {
2981 .mntflags = flags,
2982 };
54ceac45 2983 int error;
f7b422b1 2984
31f43471 2985 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2986
54ceac45
DH		 2987 /* create a new volume representation */
2988 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2989 if (IS_ERR(server)) {
2990 error = PTR_ERR(server);
2991 goto out_err_noserver;
f7b422b1 2992 }
e89a5a43 2993 sb_mntdata.server = server;
f7b422b1 2994
75180df2
TM		 2995 if (server->flags & NFS4_MOUNT_UNSHARED)
2996 compare_super = NULL;
2997
54ceac45 2998 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2999 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3000 if (IS_ERR(s)) {
3001 error = PTR_ERR(s);
3002 goto out_err_nosb;
f7b422b1 3003 }
f7b422b1 3004
54ceac45
DH		 3005 if (s->s_fs_info != server) {
3006 nfs_free_server(server);
3007 server = NULL;
fa799759
MS		 3008 } else {
3009 error = nfs_bdi_register(server);
3010 if (error)
cfbc0683 3011 goto error_splat_bdi;
54ceac45 3012 }
f7b422b1 3013
54ceac45
DH		 3014 if (!s->s_root) {
3015 /* initial superblock/root creation */
54ceac45 3016 nfs4_clone_super(s, data->sb);
2df54806 3017 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 3018 }
f7b422b1 3019
54ceac45
DH		 3020 mntroot = nfs4_get_root(s, data->fh);
3021 if (IS_ERR(mntroot)) {
3022 error = PTR_ERR(mntroot);
3023 goto error_splat_super;
3024 }
e9cc6c23
TM		 3025 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3026 dput(mntroot);
3027 error = -ESTALE;
3028 goto error_splat_super;
3029 }
f7b422b1 3030
54ceac45 3031 s->s_flags |= MS_ACTIVE;
54ceac45 3032
46c8ac74
EP		 3033 security_sb_clone_mnt_opts(data->sb, s);
3034
31f43471
AV		 3035 dprintk("<-- nfs4_xdev_mount() = 0\n");
3036 return mntroot;
54ceac45
DH		 3037
3038out_err_nosb:
3039 nfs_free_server(server);
3040out_err_noserver:
31f43471
AV		 3041 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3042 return ERR_PTR(error);
54ceac45
DH		 3043
3044error_splat_super:
cfbc0683
N		 3045 if (server && !s->s_root)
3046 bdi_unregister(&server->backing_dev_info);
3047error_splat_bdi:
6f5bbff9 3048 deactivate_locked_super(s);
31f43471
AV		 3049 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3050 return ERR_PTR(error);
f7b422b1
DH		 3051}
3052
31f43471
AV		 3053static struct dentry *
3054nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3055 const char *dev_name, void *raw_data)
f7b422b1
DH		 3056{
3057 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 3058 struct super_block *s;
3059 struct nfs_server *server;
3060 struct dentry *mntroot;
4f727296 3061 struct nfs_fh *mntfh;
75180df2 3062 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 3063 struct nfs_sb_mountdata sb_mntdata = {
3064 .mntflags = flags,
3065 };
4f727296 3066 int error = -ENOMEM;
54ceac45
DH		 3067
3068 dprintk("--> nfs4_referral_get_sb()\n");
3069
4f727296
TM		 3070 mntfh = nfs_alloc_fhandle();
3071 if (mntfh == NULL)
3072 goto out_err_nofh;
3073
54ceac45 3074 /* create a new volume representation */
4f727296 3075 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3076 if (IS_ERR(server)) {
3077 error = PTR_ERR(server);
3078 goto out_err_noserver;
3079 }
e89a5a43 3080 sb_mntdata.server = server;
54ceac45 3081
75180df2
TM		 3082 if (server->flags & NFS4_MOUNT_UNSHARED)
3083 compare_super = NULL;
3084
54ceac45 3085 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3086 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3087 if (IS_ERR(s)) {
3088 error = PTR_ERR(s);
3089 goto out_err_nosb;
3090 }
3091
3092 if (s->s_fs_info != server) {
3093 nfs_free_server(server);
3094 server = NULL;
fa799759
MS		 3095 } else {
3096 error = nfs_bdi_register(server);
3097 if (error)
cfbc0683 3098 goto error_splat_bdi;
54ceac45
DH		 3099 }
3100
3101 if (!s->s_root) {
3102 /* initial superblock/root creation */
54ceac45 3103 nfs4_fill_super(s);
2df54806 3104 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3105 }
3106
4f727296 3107 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 3108 if (IS_ERR(mntroot)) {
3109 error = PTR_ERR(mntroot);
3110 goto error_splat_super;
3111 }
e9cc6c23
TM		 3112 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3113 dput(mntroot);
3114 error = -ESTALE;
3115 goto error_splat_super;
3116 }
54ceac45
DH		 3117
3118 s->s_flags |= MS_ACTIVE;
54ceac45 3119
46c8ac74
EP		 3120 security_sb_clone_mnt_opts(data->sb, s);
3121
4f727296 3122 nfs_free_fhandle(mntfh);
54ceac45 3123 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3124 return mntroot;
54ceac45
DH		 3125
3126out_err_nosb:
3127 nfs_free_server(server);
3128out_err_noserver:
4f727296
TM		 3129 nfs_free_fhandle(mntfh);
3130out_err_nofh:
54ceac45 3131 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3132 return ERR_PTR(error);
54ceac45
DH		 3133
3134error_splat_super:
cfbc0683
N		 3135 if (server && !s->s_root)
3136 bdi_unregister(&server->backing_dev_info);
3137error_splat_bdi:
6f5bbff9 3138 deactivate_locked_super(s);
4f727296 3139 nfs_free_fhandle(mntfh);
54ceac45 3140 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3141 return ERR_PTR(error);
f7b422b1
DH		 3142}
3143
c02d7adf
TM		 3144/*
3145 * Create an NFS4 server record on referral traversal
3146 */
3147static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3148 int flags, const char *dev_name, void *raw_data,
3149 struct vfsmount *mnt)
3150{
3151 struct nfs_clone_mount *data = raw_data;
3152 char *export_path;
3153 struct vfsmount *root_mnt;
3154 int error;
3155
3156 dprintk("--> nfs4_referral_get_sb()\n");
3157
3158 export_path = data->mnt_path;
3159 data->mnt_path = "/";
3160
3161 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3162 flags, data, data->hostname);
3163 data->mnt_path = export_path;
3164
3165 error = PTR_ERR(root_mnt);
3166 if (IS_ERR(root_mnt))
3167 goto out;
3168
3169 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3170out:
3171 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3172 error != 0 ? " [error]" : "");
3173 return error;
3174}
3175
54ceac45 3176#endif /* CONFIG_NFS_V4 */
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