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[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>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf
TM		 44#include <linux/mnt_namespace.h>
45#include <linux/namei.h>
f7b422b1
DH		 46#include <linux/nfs_idmap.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
fd00a8ff 49#include <linux/in6.h>
5a0e3ad6 50#include <linux/slab.h>
fd00a8ff 51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.h>
f7b422b1
DH		 56
57#include <asm/system.h>
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
f7b422b1
DH		 66
67#define NFSDBG_FACILITY NFSDBG_VFS
68
1e657bd5
PZ		 69#ifdef CONFIG_NFS_V3
70#define NFS_DEFAULT_VERSION 3
71#else
72#define NFS_DEFAULT_VERSION 2
73#endif
74
bf0fd768
CL		 75enum {
76 /* Mount options that take no arguments */
77 Opt_soft, Opt_hard,
bf0fd768
CL		 78 Opt_posix, Opt_noposix,
79 Opt_cto, Opt_nocto,
80 Opt_ac, Opt_noac,
81 Opt_lock, Opt_nolock,
764302cc 82 Opt_v2, Opt_v3, Opt_v4,
2cf7ff7a 83 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 84 Opt_acl, Opt_noacl,
85 Opt_rdirplus, Opt_nordirplus,
75180df2 86 Opt_sharecache, Opt_nosharecache,
d740351b 87 Opt_resvport, Opt_noresvport,
b797cac7 88 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 89
90 /* Mount options that take integer arguments */
91 Opt_port,
92 Opt_rsize, Opt_wsize, Opt_bsize,
93 Opt_timeo, Opt_retrans,
94 Opt_acregmin, Opt_acregmax,
95 Opt_acdirmin, Opt_acdirmax,
96 Opt_actimeo,
97 Opt_namelen,
98 Opt_mountport,
e887cbcf 99 Opt_mountvers,
ad879cef 100 Opt_nfsvers,
3fd5be9e 101 Opt_minorversion,
bf0fd768
CL		 102
103 /* Mount options that take string arguments */
33832034 104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 105 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 106 Opt_lookupcache,
b797cac7 107 Opt_fscache_uniq,
5eebde23 108 Opt_local_lock,
bf0fd768 109
f45663ce
CL		 110 /* Special mount options */
111 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 112
113 Opt_err
114};
115
a447c093 116static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 117 { Opt_userspace, "bg" },
118 { Opt_userspace, "fg" },
ecbb3845
CL		 119 { Opt_userspace, "retry=%s" },
120
f45663ce
CL		 121 { Opt_sloppy, "sloppy" },
122
bf0fd768
CL		 123 { Opt_soft, "soft" },
124 { Opt_hard, "hard" },
d33e4dfe
CL		 125 { Opt_deprecated, "intr" },
126 { Opt_deprecated, "nointr" },
bf0fd768
CL		 127 { Opt_posix, "posix" },
128 { Opt_noposix, "noposix" },
129 { Opt_cto, "cto" },
130 { Opt_nocto, "nocto" },
131 { Opt_ac, "ac" },
132 { Opt_noac, "noac" },
133 { Opt_lock, "lock" },
134 { Opt_nolock, "nolock" },
135 { Opt_v2, "v2" },
136 { Opt_v3, "v3" },
764302cc 137 { Opt_v4, "v4" },
bf0fd768
CL		 138 { Opt_udp, "udp" },
139 { Opt_tcp, "tcp" },
2cf7ff7a 140 { Opt_rdma, "rdma" },
bf0fd768
CL		 141 { Opt_acl, "acl" },
142 { Opt_noacl, "noacl" },
143 { Opt_rdirplus, "rdirplus" },
144 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 145 { Opt_sharecache, "sharecache" },
146 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 147 { Opt_resvport, "resvport" },
148 { Opt_noresvport, "noresvport" },
b797cac7 149 { Opt_fscache, "fsc" },
b797cac7 150 { Opt_nofscache, "nofsc" },
bf0fd768 151
a5a16bae
CL		 152 { Opt_port, "port=%s" },
153 { Opt_rsize, "rsize=%s" },
154 { Opt_wsize, "wsize=%s" },
155 { Opt_bsize, "bsize=%s" },
156 { Opt_timeo, "timeo=%s" },
157 { Opt_retrans, "retrans=%s" },
158 { Opt_acregmin, "acregmin=%s" },
159 { Opt_acregmax, "acregmax=%s" },
160 { Opt_acdirmin, "acdirmin=%s" },
161 { Opt_acdirmax, "acdirmax=%s" },
162 { Opt_actimeo, "actimeo=%s" },
163 { Opt_namelen, "namlen=%s" },
164 { Opt_mountport, "mountport=%s" },
165 { Opt_mountvers, "mountvers=%s" },
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 168 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
33832034 175 { Opt_mounthost, "mounthost=%s" },
0ac83779 176 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 177
7973c1f1 178 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 179 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 180 { Opt_local_lock, "local_lock=%s" },
7973c1f1 181
bf0fd768
CL		 182 { Opt_err, NULL }
183};
184
185enum {
ee671b01 186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 187
188 Opt_xprt_err
189};
190
a447c093 191static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 192 { Opt_xprt_udp, "udp" },
ee671b01 193 { Opt_xprt_udp6, "udp6" },
bf0fd768 194 { Opt_xprt_tcp, "tcp" },
ee671b01 195 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 196 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 197
198 { Opt_xprt_err, NULL }
199};
200
201enum {
202 Opt_sec_none, Opt_sec_sys,
203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
206
207 Opt_sec_err
208};
209
a447c093 210static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 211 { Opt_sec_none, "none" },
212 { Opt_sec_none, "null" },
213 { Opt_sec_sys, "sys" },
214
215 { Opt_sec_krb5, "krb5" },
216 { Opt_sec_krb5i, "krb5i" },
217 { Opt_sec_krb5p, "krb5p" },
218
219 { Opt_sec_lkey, "lkey" },
220 { Opt_sec_lkeyi, "lkeyi" },
221 { Opt_sec_lkeyp, "lkeyp" },
222
8d042218
OK		 223 { Opt_sec_spkm, "spkm3" },
224 { Opt_sec_spkmi, "spkm3i" },
225 { Opt_sec_spkmp, "spkm3p" },
226
bf0fd768
CL		 227 { Opt_sec_err, NULL }
228};
229
7973c1f1
TM		 230enum {
231 Opt_lookupcache_all, Opt_lookupcache_positive,
232 Opt_lookupcache_none,
233
234 Opt_lookupcache_err
235};
236
237static match_table_t nfs_lookupcache_tokens = {
238 { Opt_lookupcache_all, "all" },
239 { Opt_lookupcache_positive, "pos" },
240 { Opt_lookupcache_positive, "positive" },
241 { Opt_lookupcache_none, "none" },
242
243 { Opt_lookupcache_err, NULL }
244};
245
5eebde23
SJ		 246enum {
247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
248 Opt_local_lock_none,
249
250 Opt_local_lock_err
251};
252
253static match_table_t nfs_local_lock_tokens = {
254 { Opt_local_lock_all, "all" },
255 { Opt_local_lock_flock, "flock" },
256 { Opt_local_lock_posix, "posix" },
257 { Opt_local_lock_none, "none" },
258
259 { Opt_local_lock_err, NULL }
260};
261
bf0fd768 262
42faad99 263static void nfs_umount_begin(struct super_block *);
816724e6 264static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 265static int nfs_show_options(struct seq_file *, struct vfsmount *);
266static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 267static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
31f43471
AV		 268static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
269 int flags, const char *dev_name, void *raw_data);
387c149b 270static void nfs_put_super(struct super_block *);
f7b422b1 271static void nfs_kill_super(struct super_block *);
48b605f8 272static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 273
274static struct file_system_type nfs_fs_type = {
275 .owner = THIS_MODULE,
276 .name = "nfs",
277 .get_sb = nfs_get_sb,
278 .kill_sb = nfs_kill_super,
349457cc 279 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 280};
281
54ceac45 282struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 283 .owner = THIS_MODULE,
284 .name = "nfs",
31f43471 285 .mount = nfs_xdev_mount,
f7b422b1 286 .kill_sb = nfs_kill_super,
349457cc 287 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 288};
289
ee9b6d61 290static const struct super_operations nfs_sops = {
f7b422b1
DH		 291 .alloc_inode = nfs_alloc_inode,
292 .destroy_inode = nfs_destroy_inode,
293 .write_inode = nfs_write_inode,
387c149b 294 .put_super = nfs_put_super,
f7b422b1 295 .statfs = nfs_statfs,
b57922d9 296 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 297 .umount_begin = nfs_umount_begin,
298 .show_options = nfs_show_options,
299 .show_stats = nfs_show_stats,
48b605f8 300 .remount_fs = nfs_remount,
f7b422b1
DH		 301};
302
303#ifdef CONFIG_NFS_V4
7630c852
CL		 304static int nfs4_validate_text_mount_data(void *options,
305 struct nfs_parsed_mount_data *args, const char *dev_name);
a6fe23be
CL		 306static int nfs4_try_mount(int flags, const char *dev_name,
307 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
816724e6
TM		 308static int nfs4_get_sb(struct file_system_type *fs_type,
309 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
31f43471
AV		 310static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
311 int flags, const char *dev_name, void *raw_data);
312static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
313 int flags, const char *dev_name, void *raw_data);
54ceac45
DH		 314static int nfs4_referral_get_sb(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
31f43471
AV		 316static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 318static void nfs4_kill_super(struct super_block *sb);
319
320static struct file_system_type nfs4_fs_type = {
321 .owner = THIS_MODULE,
322 .name = "nfs4",
323 .get_sb = nfs4_get_sb,
324 .kill_sb = nfs4_kill_super,
349457cc 325 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 326};
327
c02d7adf
TM		 328static struct file_system_type nfs4_remote_fs_type = {
329 .owner = THIS_MODULE,
330 .name = "nfs4",
31f43471 331 .mount = nfs4_remote_mount,
c02d7adf
TM		 332 .kill_sb = nfs4_kill_super,
333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
334};
335
54ceac45 336struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 337 .owner = THIS_MODULE,
338 .name = "nfs4",
31f43471 339 .mount = nfs4_xdev_mount,
f7b422b1 340 .kill_sb = nfs4_kill_super,
349457cc 341 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 342};
343
c02d7adf
TM		 344static struct file_system_type nfs4_remote_referral_fs_type = {
345 .owner = THIS_MODULE,
346 .name = "nfs4",
31f43471 347 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 348 .kill_sb = nfs4_kill_super,
349 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
350};
351
54ceac45 352struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 353 .owner = THIS_MODULE,
354 .name = "nfs4",
54ceac45 355 .get_sb = nfs4_referral_get_sb,
f7b422b1 356 .kill_sb = nfs4_kill_super,
349457cc 357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 358};
359
ee9b6d61 360static const struct super_operations nfs4_sops = {
f7b422b1
DH		 361 .alloc_inode = nfs_alloc_inode,
362 .destroy_inode = nfs_destroy_inode,
363 .write_inode = nfs_write_inode,
387c149b 364 .put_super = nfs_put_super,
f7b422b1 365 .statfs = nfs_statfs,
b57922d9 366 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 367 .umount_begin = nfs_umount_begin,
368 .show_options = nfs_show_options,
369 .show_stats = nfs_show_stats,
48b605f8 370 .remount_fs = nfs_remount,
f7b422b1
DH		 371};
372#endif
373
8e1f936b
RR		 374static struct shrinker acl_shrinker = {
375 .shrink = nfs_access_cache_shrinker,
376 .seeks = DEFAULT_SEEKS,
377};
979df72e 378
f7b422b1
DH		 379/*
380 * Register the NFS filesystems
381 */
382int __init register_nfs_fs(void)
383{
384 int ret;
385
386 ret = register_filesystem(&nfs_fs_type);
387 if (ret < 0)
388 goto error_0;
389
f7b422b1
DH		 390 ret = nfs_register_sysctl();
391 if (ret < 0)
392 goto error_1;
89a09141 393#ifdef CONFIG_NFS_V4
f7b422b1
DH		 394 ret = register_filesystem(&nfs4_fs_type);
395 if (ret < 0)
396 goto error_2;
397#endif
8e1f936b 398 register_shrinker(&acl_shrinker);
f7b422b1
DH		 399 return 0;
400
401#ifdef CONFIG_NFS_V4
402error_2:
403 nfs_unregister_sysctl();
89a09141 404#endif
f7b422b1
DH		 405error_1:
406 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 407error_0:
408 return ret;
409}
410
411/*
412 * Unregister the NFS filesystems
413 */
414void __exit unregister_nfs_fs(void)
415{
8e1f936b 416 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 417#ifdef CONFIG_NFS_V4
418 unregister_filesystem(&nfs4_fs_type);
f7b422b1 419#endif
49af7ee1 420 nfs_unregister_sysctl();
f7b422b1
DH		 421 unregister_filesystem(&nfs_fs_type);
422}
423
1daef0a8 424void nfs_sb_active(struct super_block *sb)
ef818a28 425{
1daef0a8 426 struct nfs_server *server = NFS_SB(sb);
ef818a28 427
1daef0a8
TM		 428 if (atomic_inc_return(&server->active) == 1)
429 atomic_inc(&sb->s_active);
ef818a28
SD		 430}
431
1daef0a8 432void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 433{
434 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 435
436 if (atomic_dec_and_test(&server->active))
437 deactivate_super(sb);
ef818a28
SD		 438}
439
f7b422b1
DH		 440/*
441 * Deliver file system statistics to userspace
442 */
816724e6 443static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 444{
0c7d90cf 445 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 446 unsigned char blockbits;
447 unsigned long blockres;
0c7d90cf 448 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 449 struct nfs_fsstat res;
450 int error = -ENOMEM;
451
452 res.fattr = nfs_alloc_fattr();
453 if (res.fattr == NULL)
454 goto out_err;
f7b422b1 455
8fa5c000 456 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 457 if (unlikely(error == -ESTALE)) {
458 struct dentry *pd_dentry;
459
460 pd_dentry = dget_parent(dentry);
461 if (pd_dentry != NULL) {
462 nfs_zap_caches(pd_dentry->d_inode);
463 dput(pd_dentry);
464 }
465 }
ca7e9a0d 466 nfs_free_fattr(res.fattr);
f7b422b1
DH		 467 if (error < 0)
468 goto out_err;
ca7e9a0d 469
1a0ba9ae 470 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 471
472 /*
473 * Current versions of glibc do not correctly handle the
474 * case where f_frsize != f_bsize. Eventually we want to
475 * report the value of wtmult in this field.
476 */
0c7d90cf 477 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 478
479 /*
480 * On most *nix systems, f_blocks, f_bfree, and f_bavail
481 * are reported in units of f_frsize. Linux hasn't had
482 * an f_frsize field in its statfs struct until recently,
483 * thus historically Linux's sys_statfs reports these
484 * fields in units of f_bsize.
485 */
0c7d90cf
DH		 486 buf->f_bsize = dentry->d_sb->s_blocksize;
487 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 488 blockres = (1 << blockbits) - 1;
489 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
490 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
491 buf->f_bavail = (res.abytes + blockres) >> blockbits;
492
493 buf->f_files = res.tfiles;
494 buf->f_ffree = res.afiles;
495
496 buf->f_namelen = server->namelen;
1a0ba9ae 497
f7b422b1
DH		 498 return 0;
499
500 out_err:
3110ff80 501 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 502 return error;
f7b422b1
DH		 503}
504
7d4e2747
DH		 505/*
506 * Map the security flavour number to a name
507 */
81039f1f
TM		 508static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
509{
7d4e2747 510 static const struct {
81039f1f
TM		 511 rpc_authflavor_t flavour;
512 const char *str;
513 } sec_flavours[] = {
514 { RPC_AUTH_NULL, "null" },
515 { RPC_AUTH_UNIX, "sys" },
516 { RPC_AUTH_GSS_KRB5, "krb5" },
517 { RPC_AUTH_GSS_KRB5I, "krb5i" },
518 { RPC_AUTH_GSS_KRB5P, "krb5p" },
519 { RPC_AUTH_GSS_LKEY, "lkey" },
520 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
521 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
522 { RPC_AUTH_GSS_SPKM, "spkm" },
523 { RPC_AUTH_GSS_SPKMI, "spkmi" },
524 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 525 { UINT_MAX, "unknown" }
81039f1f
TM		 526 };
527 int i;
528
4d81cd16 529 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 530 if (sec_flavours[i].flavour == flavour)
531 break;
532 }
533 return sec_flavours[i].str;
534}
535
ee671b01
JL		 536static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
537 int showdefaults)
538{
539 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
540
541 seq_printf(m, ",mountproto=");
542 switch (sap->sa_family) {
543 case AF_INET:
544 switch (nfss->mountd_protocol) {
545 case IPPROTO_UDP:
546 seq_printf(m, RPCBIND_NETID_UDP);
547 break;
548 case IPPROTO_TCP:
549 seq_printf(m, RPCBIND_NETID_TCP);
550 break;
551 default:
552 if (showdefaults)
553 seq_printf(m, "auto");
554 }
555 break;
556 case AF_INET6:
557 switch (nfss->mountd_protocol) {
558 case IPPROTO_UDP:
559 seq_printf(m, RPCBIND_NETID_UDP6);
560 break;
561 case IPPROTO_TCP:
562 seq_printf(m, RPCBIND_NETID_TCP6);
563 break;
564 default:
565 if (showdefaults)
566 seq_printf(m, "auto");
567 }
568 break;
569 default:
570 if (showdefaults)
571 seq_printf(m, "auto");
572 }
573}
574
82d101d5
CL		 575static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
576 int showdefaults)
577{
578 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
579
d5eff1a3
BS		 580 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
581 return;
582
82d101d5
CL		 583 switch (sap->sa_family) {
584 case AF_INET: {
585 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 586 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 587 break;
588 }
589 case AF_INET6: {
590 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 591 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 592 break;
593 }
594 default:
595 if (showdefaults)
596 seq_printf(m, ",mountaddr=unspecified");
597 }
598
599 if (nfss->mountd_version || showdefaults)
600 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 601 if ((nfss->mountd_port &&
602 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
603 showdefaults)
82d101d5
CL		 604 seq_printf(m, ",mountport=%u", nfss->mountd_port);
605
ee671b01 606 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 607}
608
0be8189f
TM		 609#ifdef CONFIG_NFS_V4
610static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
611 int showdefaults)
612{
613 struct nfs_client *clp = nfss->nfs_client;
614
615 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
616 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
617}
618#else
619static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
620 int showdefaults)
621{
622}
623#endif
624
f7b422b1
DH		 625/*
626 * Describe the mount options in force on this server representation
627 */
82d101d5
CL		 628static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
629 int showdefaults)
f7b422b1 630{
509de811 631 static const struct proc_nfs_info {
f7b422b1 632 int flag;
509de811
DH		 633 const char *str;
634 const char *nostr;
f7b422b1
DH		 635 } nfs_info[] = {
636 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 637 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 638 { NFS_MOUNT_NOCTO, ",nocto", "" },
639 { NFS_MOUNT_NOAC, ",noac", "" },
640 { NFS_MOUNT_NONLM, ",nolock", "" },
641 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 642 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 643 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
644 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 645 { 0, NULL, NULL }
646 };
509de811 647 const struct proc_nfs_info *nfs_infop;
8fa5c000 648 struct nfs_client *clp = nfss->nfs_client;
82d101d5 649 u32 version = clp->rpc_ops->version;
7c563cc9 650 int local_flock, local_fcntl;
f7b422b1 651
82d101d5 652 seq_printf(m, ",vers=%u", version);
2d767432
CL		 653 seq_printf(m, ",rsize=%u", nfss->rsize);
654 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 655 if (nfss->bsize != 0)
656 seq_printf(m, ",bsize=%u", nfss->bsize);
657 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 658 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 659 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 660 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 661 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 662 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 663 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 664 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 665 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 666 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
667 if (nfss->flags & nfs_infop->flag)
668 seq_puts(m, nfs_infop->str);
669 else
670 seq_puts(m, nfs_infop->nostr);
671 }
56928edd 672 seq_printf(m, ",proto=%s",
ee671b01 673 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 674 if (version == 4) {
675 if (nfss->port != NFS_PORT)
676 seq_printf(m, ",port=%u", nfss->port);
677 } else
678 if (nfss->port)
679 seq_printf(m, ",port=%u", nfss->port);
680
33170233
TM		 681 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
682 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 683 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 684
685 if (version != 4)
686 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 687 else
688 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 689
b797cac7
DH		 690 if (nfss->options & NFS_OPTION_FSCACHE)
691 seq_printf(m, ",fsc");
9b00c643
PL		 692
693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
695 seq_printf(m, ",lookupcache=none");
696 else
697 seq_printf(m, ",lookupcache=pos");
698 }
7c563cc9
SJ		 699
700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
702
703 if (!local_flock && !local_fcntl)
704 seq_printf(m, ",local_lock=none");
705 else if (local_flock && local_fcntl)
706 seq_printf(m, ",local_lock=all");
707 else if (local_flock)
708 seq_printf(m, ",local_lock=flock");
709 else
710 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 711}
712
713/*
714 * Describe the mount options on this VFS mountpoint
715 */
716static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
717{
718 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
719
720 nfs_show_mount_options(m, nfss, 0);
721
5d8515ca
CL		 722 seq_printf(m, ",addr=%s",
723 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
724 RPC_DISPLAY_ADDR));
f7b422b1
DH		 725
726 return 0;
727}
728
729/*
730 * Present statistical information for this VFS mountpoint
731 */
732static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
733{
734 int i, cpu;
735 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
736 struct rpc_auth *auth = nfss->client->cl_auth;
737 struct nfs_iostats totals = { };
738
739 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
740
741 /*
742 * Display all mount option settings
743 */
744 seq_printf(m, "\n\topts:\t");
745 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
746 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
747 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
748 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
749 nfs_show_mount_options(m, nfss, 1);
750
751 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
752
753 seq_printf(m, "\n\tcaps:\t");
754 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 755 seq_printf(m, ",wtmult=%u", nfss->wtmult);
756 seq_printf(m, ",dtsize=%u", nfss->dtsize);
757 seq_printf(m, ",bsize=%u", nfss->bsize);
758 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 759
760#ifdef CONFIG_NFS_V4
40c55319 761 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 762 seq_printf(m, "\n\tnfsv4:\t");
763 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
764 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
765 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
766 }
767#endif
768
769 /*
770 * Display security flavor in effect for this mount
771 */
2d767432 772 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 773 if (auth->au_flavor)
2d767432 774 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 775
776 /*
777 * Display superblock I/O counters
778 */
779 for_each_possible_cpu(cpu) {
780 struct nfs_iostats *stats;
781
782 preempt_disable();
783 stats = per_cpu_ptr(nfss->io_stats, cpu);
784
785 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
786 totals.events[i] += stats->events[i];
787 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
788 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 789#ifdef CONFIG_NFS_FSCACHE
790 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
791 totals.fscache[i] += stats->fscache[i];
792#endif
f7b422b1
DH		 793
794 preempt_enable();
795 }
796
797 seq_printf(m, "\n\tevents:\t");
798 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
799 seq_printf(m, "%lu ", totals.events[i]);
800 seq_printf(m, "\n\tbytes:\t");
801 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
802 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 803#ifdef CONFIG_NFS_FSCACHE
804 if (nfss->options & NFS_OPTION_FSCACHE) {
805 seq_printf(m, "\n\tfsc:\t");
806 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
807 seq_printf(m, "%Lu ", totals.bytes[i]);
808 }
809#endif
f7b422b1
DH		 810 seq_printf(m, "\n");
811
812 rpc_print_iostats(m, nfss->client);
813
814 return 0;
815}
816
817/*
818 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 819 * in response to xdev traversals and referrals
f7b422b1 820 */
42faad99 821static void nfs_umount_begin(struct super_block *sb)
f7b422b1 822{
67e55205 823 struct nfs_server *server;
fc6ae3cf
TM		 824 struct rpc_clnt *rpc;
825
67e55205 826 server = NFS_SB(sb);
fc6ae3cf
TM		 827 /* -EIO all pending I/O */
828 rpc = server->client_acl;
829 if (!IS_ERR(rpc))
830 rpc_killall_tasks(rpc);
831 rpc = server->client;
832 if (!IS_ERR(rpc))
833 rpc_killall_tasks(rpc);
f7b422b1
DH		 834}
835
c5811dbd 836static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 837{
838 struct nfs_parsed_mount_data *data;
839
840 data = kzalloc(sizeof(*data), GFP_KERNEL);
841 if (data) {
9423a08a
CL		 842 data->acregmin = NFS_DEF_ACREGMIN;
843 data->acregmax = NFS_DEF_ACREGMAX;
844 data->acdirmin = NFS_DEF_ACDIRMIN;
845 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 846 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 847 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 848 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 849 data->auth_flavors[0] = RPC_AUTH_UNIX;
850 data->auth_flavor_len = 1;
c5811dbd 851 data->version = version;
9423a08a
CL		 852 data->minorversion = 0;
853 }
854 return data;
855}
856
fc50d58f 857/*
cdcd7f9a
CL		 858 * Sanity-check a server address provided by the mount command.
859 *
860 * Address family must be initialized, and address must not be
861 * the ANY address for that family.
fc50d58f
CL		 862 */
863static int nfs_verify_server_address(struct sockaddr *addr)
864{
865 switch (addr->sa_family) {
866 case AF_INET: {
cdcd7f9a 867 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 868 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 869 }
870 case AF_INET6: {
871 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
872 return !ipv6_addr_any(sa);
fc50d58f
CL		 873 }
874 }
875
53a0b9c4 876 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 877 return 0;
878}
879
4cfd74fc
CL		 880/*
881 * Select between a default port value and a user-specified port value.
882 * If a zero value is set, then autobind will be used.
883 */
f5855fec 884static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 885 const unsigned short default_port)
886{
f5855fec
TM		 887 if (*port == NFS_UNSPEC_PORT)
888 *port = default_port;
4cfd74fc 889
f5855fec 890 rpc_set_port(sap, *port);
4cfd74fc
CL		 891}
892
259875ef
TM		 893/*
894 * Sanity check the NFS transport protocol.
895 *
896 */
897static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
898{
899 switch (mnt->nfs_server.protocol) {
900 case XPRT_TRANSPORT_UDP:
901 case XPRT_TRANSPORT_TCP:
902 case XPRT_TRANSPORT_RDMA:
903 break;
904 default:
905 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
906 }
907}
908
909/*
910 * For text based NFSv2/v3 mounts, the mount protocol transport default
911 * settings should depend upon the specified NFS transport.
912 */
913static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
914{
915 nfs_validate_transport_protocol(mnt);
916
917 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
918 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
919 return;
920 switch (mnt->nfs_server.protocol) {
921 case XPRT_TRANSPORT_UDP:
922 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
923 break;
924 case XPRT_TRANSPORT_TCP:
925 case XPRT_TRANSPORT_RDMA:
926 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
927 }
928}
929
01060c89
CL		 930/*
931 * Parse the value of the 'sec=' option.
01060c89
CL		 932 */
933static int nfs_parse_security_flavors(char *value,
934 struct nfs_parsed_mount_data *mnt)
935{
936 substring_t args[MAX_OPT_ARGS];
937
938 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
939
940 switch (match_token(value, nfs_secflavor_tokens, args)) {
941 case Opt_sec_none:
01060c89
CL		 942 mnt->auth_flavors[0] = RPC_AUTH_NULL;
943 break;
944 case Opt_sec_sys:
01060c89
CL		 945 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
946 break;
947 case Opt_sec_krb5:
01060c89
CL		 948 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
949 break;
950 case Opt_sec_krb5i:
01060c89
CL		 951 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
952 break;
953 case Opt_sec_krb5p:
01060c89
CL		 954 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
955 break;
956 case Opt_sec_lkey:
01060c89
CL		 957 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
958 break;
959 case Opt_sec_lkeyi:
01060c89
CL		 960 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
961 break;
962 case Opt_sec_lkeyp:
01060c89
CL		 963 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
964 break;
965 case Opt_sec_spkm:
01060c89
CL		 966 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
967 break;
968 case Opt_sec_spkmi:
01060c89
CL		 969 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
970 break;
971 case Opt_sec_spkmp:
01060c89
CL		 972 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
973 break;
974 default:
975 return 0;
976 }
977
059f90b3 978 mnt->auth_flavor_len = 1;
01060c89
CL		 979 return 1;
980}
981
bf0fd768
CL		 982/*
983 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 984 * a data structure. The whole mount string is processed; bad options are
985 * skipped as they are encountered. If there were no errors, return 1;
986 * otherwise return 0 (zero).
bf0fd768
CL		 987 */
988static int nfs_parse_mount_options(char *raw,
989 struct nfs_parsed_mount_data *mnt)
990{
f9c3a380 991 char *p, *string, *secdata;
d23c45fd 992 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 993 unsigned short protofamily = AF_UNSPEC;
994 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 995
996 if (!raw) {
997 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
998 return 1;
999 }
1000 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1001
f9c3a380
EP		 1002 secdata = alloc_secdata();
1003 if (!secdata)
1004 goto out_nomem;
1005
1006 rc = security_sb_copy_data(raw, secdata);
1007 if (rc)
1008 goto out_security_failure;
1009
1010 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1011 if (rc)
1012 goto out_security_failure;
1013
1014 free_secdata(secdata);
1015
bf0fd768
CL		 1016 while ((p = strsep(&raw, ",")) != NULL) {
1017 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1018 unsigned long option;
1019 int token;
bf0fd768
CL		 1020
1021 if (!*p)
1022 continue;
1023
1024 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1025
1026 token = match_token(p, nfs_mount_option_tokens, args);
1027 switch (token) {
f45663ce
CL		 1028
1029 /*
1030 * boolean options: foo/nofoo
1031 */
bf0fd768
CL		 1032 case Opt_soft:
1033 mnt->flags |= NFS_MOUNT_SOFT;
1034 break;
1035 case Opt_hard:
1036 mnt->flags &= ~NFS_MOUNT_SOFT;
1037 break;
bf0fd768
CL		 1038 case Opt_posix:
1039 mnt->flags |= NFS_MOUNT_POSIX;
1040 break;
1041 case Opt_noposix:
1042 mnt->flags &= ~NFS_MOUNT_POSIX;
1043 break;
1044 case Opt_cto:
1045 mnt->flags &= ~NFS_MOUNT_NOCTO;
1046 break;
1047 case Opt_nocto:
1048 mnt->flags |= NFS_MOUNT_NOCTO;
1049 break;
1050 case Opt_ac:
1051 mnt->flags &= ~NFS_MOUNT_NOAC;
1052 break;
1053 case Opt_noac:
1054 mnt->flags |= NFS_MOUNT_NOAC;
1055 break;
1056 case Opt_lock:
1057 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1058 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1059 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1060 break;
1061 case Opt_nolock:
1062 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1063 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1064 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1065 break;
1066 case Opt_v2:
1067 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1068 mnt->version = 2;
bf0fd768
CL		 1069 break;
1070 case Opt_v3:
1071 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1072 mnt->version = 3;
bf0fd768 1073 break;
764302cc
CL		 1074 case Opt_v4:
1075 mnt->flags &= ~NFS_MOUNT_VER3;
1076 mnt->version = 4;
1077 break;
bf0fd768
CL		 1078 case Opt_udp:
1079 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1080 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1081 break;
1082 case Opt_tcp:
1083 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1084 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1085 break;
2cf7ff7a
TT		 1086 case Opt_rdma:
1087 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1088 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1089 xprt_load_transport(p);
2cf7ff7a 1090 break;
bf0fd768
CL		 1091 case Opt_acl:
1092 mnt->flags &= ~NFS_MOUNT_NOACL;
1093 break;
1094 case Opt_noacl:
1095 mnt->flags |= NFS_MOUNT_NOACL;
1096 break;
1097 case Opt_rdirplus:
1098 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1099 break;
1100 case Opt_nordirplus:
1101 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1102 break;
75180df2
TM		 1103 case Opt_sharecache:
1104 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1105 break;
1106 case Opt_nosharecache:
1107 mnt->flags |= NFS_MOUNT_UNSHARED;
1108 break;
d740351b
CL		 1109 case Opt_resvport:
1110 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1111 break;
1112 case Opt_noresvport:
1113 mnt->flags |= NFS_MOUNT_NORESVPORT;
1114 break;
b797cac7
DH		 1115 case Opt_fscache:
1116 mnt->options |= NFS_OPTION_FSCACHE;
1117 kfree(mnt->fscache_uniq);
1118 mnt->fscache_uniq = NULL;
1119 break;
1120 case Opt_nofscache:
1121 mnt->options &= ~NFS_OPTION_FSCACHE;
1122 kfree(mnt->fscache_uniq);
1123 mnt->fscache_uniq = NULL;
1124 break;
bf0fd768 1125
f45663ce
CL		 1126 /*
1127 * options that take numeric values
1128 */
bf0fd768 1129 case Opt_port:
a5a16bae
CL		 1130 string = match_strdup(args);
1131 if (string == NULL)
1132 goto out_nomem;
1133 rc = strict_strtoul(string, 10, &option);
1134 kfree(string);
4be929be 1135 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1136 goto out_invalid_value;
1137 mnt->nfs_server.port = option;
bf0fd768
CL		 1138 break;
1139 case Opt_rsize:
a5a16bae
CL		 1140 string = match_strdup(args);
1141 if (string == NULL)
1142 goto out_nomem;
1143 rc = strict_strtoul(string, 10, &option);
1144 kfree(string);
1145 if (rc != 0)
d23c45fd
CL		 1146 goto out_invalid_value;
1147 mnt->rsize = option;
bf0fd768
CL		 1148 break;
1149 case Opt_wsize:
a5a16bae
CL		 1150 string = match_strdup(args);
1151 if (string == NULL)
1152 goto out_nomem;
1153 rc = strict_strtoul(string, 10, &option);
1154 kfree(string);
1155 if (rc != 0)
d23c45fd
CL		 1156 goto out_invalid_value;
1157 mnt->wsize = option;
bf0fd768
CL		 1158 break;
1159 case Opt_bsize:
a5a16bae
CL		 1160 string = match_strdup(args);
1161 if (string == NULL)
1162 goto out_nomem;
1163 rc = strict_strtoul(string, 10, &option);
1164 kfree(string);
1165 if (rc != 0)
d23c45fd
CL		 1166 goto out_invalid_value;
1167 mnt->bsize = option;
bf0fd768
CL		 1168 break;
1169 case Opt_timeo:
a5a16bae
CL		 1170 string = match_strdup(args);
1171 if (string == NULL)
1172 goto out_nomem;
1173 rc = strict_strtoul(string, 10, &option);
1174 kfree(string);
1175 if (rc != 0 || option == 0)
d23c45fd
CL		 1176 goto out_invalid_value;
1177 mnt->timeo = option;
bf0fd768
CL		 1178 break;
1179 case Opt_retrans:
a5a16bae
CL		 1180 string = match_strdup(args);
1181 if (string == NULL)
1182 goto out_nomem;
1183 rc = strict_strtoul(string, 10, &option);
1184 kfree(string);
1185 if (rc != 0 || option == 0)
d23c45fd
CL		 1186 goto out_invalid_value;
1187 mnt->retrans = option;
bf0fd768
CL		 1188 break;
1189 case Opt_acregmin:
a5a16bae
CL		 1190 string = match_strdup(args);
1191 if (string == NULL)
1192 goto out_nomem;
1193 rc = strict_strtoul(string, 10, &option);
1194 kfree(string);
1195 if (rc != 0)
d23c45fd
CL		 1196 goto out_invalid_value;
1197 mnt->acregmin = option;
bf0fd768
CL		 1198 break;
1199 case Opt_acregmax:
a5a16bae
CL		 1200 string = match_strdup(args);
1201 if (string == NULL)
1202 goto out_nomem;
1203 rc = strict_strtoul(string, 10, &option);
1204 kfree(string);
1205 if (rc != 0)
d23c45fd
CL		 1206 goto out_invalid_value;
1207 mnt->acregmax = option;
bf0fd768
CL		 1208 break;
1209 case Opt_acdirmin:
a5a16bae
CL		 1210 string = match_strdup(args);
1211 if (string == NULL)
1212 goto out_nomem;
1213 rc = strict_strtoul(string, 10, &option);
1214 kfree(string);
1215 if (rc != 0)
d23c45fd
CL		 1216 goto out_invalid_value;
1217 mnt->acdirmin = option;
bf0fd768
CL		 1218 break;
1219 case Opt_acdirmax:
a5a16bae
CL		 1220 string = match_strdup(args);
1221 if (string == NULL)
1222 goto out_nomem;
1223 rc = strict_strtoul(string, 10, &option);
1224 kfree(string);
1225 if (rc != 0)
d23c45fd
CL		 1226 goto out_invalid_value;
1227 mnt->acdirmax = option;
bf0fd768
CL		 1228 break;
1229 case Opt_actimeo:
a5a16bae
CL		 1230 string = match_strdup(args);
1231 if (string == NULL)
1232 goto out_nomem;
1233 rc = strict_strtoul(string, 10, &option);
1234 kfree(string);
1235 if (rc != 0)
d23c45fd
CL		 1236 goto out_invalid_value;
1237 mnt->acregmin = mnt->acregmax =
1238 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1239 break;
1240 case Opt_namelen:
a5a16bae
CL		 1241 string = match_strdup(args);
1242 if (string == NULL)
1243 goto out_nomem;
1244 rc = strict_strtoul(string, 10, &option);
1245 kfree(string);
1246 if (rc != 0)
d23c45fd
CL		 1247 goto out_invalid_value;
1248 mnt->namlen = option;
bf0fd768
CL		 1249 break;
1250 case Opt_mountport:
a5a16bae
CL		 1251 string = match_strdup(args);
1252 if (string == NULL)
1253 goto out_nomem;
1254 rc = strict_strtoul(string, 10, &option);
1255 kfree(string);
4be929be 1256 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1257 goto out_invalid_value;
1258 mnt->mount_server.port = option;
bf0fd768 1259 break;
bf0fd768 1260 case Opt_mountvers:
a5a16bae
CL		 1261 string = match_strdup(args);
1262 if (string == NULL)
1263 goto out_nomem;
1264 rc = strict_strtoul(string, 10, &option);
1265 kfree(string);
1266 if (rc != 0 ||
f45663ce 1267 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1268 option > NFS_MNT3_VERSION)
1269 goto out_invalid_value;
1270 mnt->mount_server.version = option;
bf0fd768 1271 break;
bf0fd768 1272 case Opt_nfsvers:
a5a16bae
CL		 1273 string = match_strdup(args);
1274 if (string == NULL)
1275 goto out_nomem;
1276 rc = strict_strtoul(string, 10, &option);
1277 kfree(string);
1278 if (rc != 0)
d23c45fd 1279 goto out_invalid_value;
bf0fd768 1280 switch (option) {
f45663ce 1281 case NFS2_VERSION:
bf0fd768 1282 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1283 mnt->version = 2;
bf0fd768 1284 break;
f45663ce 1285 case NFS3_VERSION:
bf0fd768 1286 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1287 mnt->version = 3;
1288 break;
764302cc
CL		 1289 case NFS4_VERSION:
1290 mnt->flags &= ~NFS_MOUNT_VER3;
1291 mnt->version = 4;
bf0fd768
CL		 1292 break;
1293 default:
d23c45fd 1294 goto out_invalid_value;
bf0fd768
CL		 1295 }
1296 break;
3fd5be9e 1297 case Opt_minorversion:
f3f4f4ed
CL		 1298 string = match_strdup(args);
1299 if (string == NULL)
1300 goto out_nomem;
1301 rc = strict_strtoul(string, 10, &option);
1302 kfree(string);
1303 if (rc != 0)
1304 goto out_invalid_value;
1305 if (option > NFS4_MAX_MINOR_VERSION)
1306 goto out_invalid_value;
1307 mnt->minorversion = option;
3fd5be9e 1308 break;
bf0fd768 1309
f45663ce
CL		 1310 /*
1311 * options that take text values
1312 */
bf0fd768
CL		 1313 case Opt_sec:
1314 string = match_strdup(args);
1315 if (string == NULL)
1316 goto out_nomem;
01060c89 1317 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1318 kfree(string);
f45663ce 1319 if (!rc) {
f45663ce
CL		 1320 dfprintk(MOUNT, "NFS: unrecognized "
1321 "security flavor\n");
d23c45fd 1322 return 0;
f45663ce 1323 }
bf0fd768
CL		 1324 break;
1325 case Opt_proto:
1326 string = match_strdup(args);
1327 if (string == NULL)
1328 goto out_nomem;
1329 token = match_token(string,
1330 nfs_xprt_protocol_tokens, args);
bf0fd768 1331
ee671b01 1332 protofamily = AF_INET;
bf0fd768 1333 switch (token) {
ee671b01
JL		 1334 case Opt_xprt_udp6:
1335 protofamily = AF_INET6;
fdb66ff4 1336 case Opt_xprt_udp:
bf0fd768 1337 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1338 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1339 kfree(string);
bf0fd768 1340 break;
ee671b01
JL		 1341 case Opt_xprt_tcp6:
1342 protofamily = AF_INET6;
fdb66ff4 1343 case Opt_xprt_tcp:
bf0fd768 1344 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1345 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1346 kfree(string);
bf0fd768 1347 break;
2cf7ff7a
TT		 1348 case Opt_xprt_rdma:
1349 /* vector side protocols to TCP */
1350 mnt->flags |= NFS_MOUNT_TCP;
1351 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1352 xprt_load_transport(string);
d23c45fd 1353 kfree(string);
2cf7ff7a 1354 break;
bf0fd768 1355 default:
f45663ce
CL		 1356 dfprintk(MOUNT, "NFS: unrecognized "
1357 "transport protocol\n");
4223a4a1 1358 kfree(string);
d23c45fd 1359 return 0;
bf0fd768
CL		 1360 }
1361 break;
1362 case Opt_mountproto:
1363 string = match_strdup(args);
1364 if (string == NULL)
1365 goto out_nomem;
1366 token = match_token(string,
1367 nfs_xprt_protocol_tokens, args);
d508afb4 1368 kfree(string);
bf0fd768 1369
ee671b01 1370 mountfamily = AF_INET;
bf0fd768 1371 switch (token) {
ee671b01
JL		 1372 case Opt_xprt_udp6:
1373 mountfamily = AF_INET6;
fdb66ff4 1374 case Opt_xprt_udp:
0896a725 1375 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1376 break;
ee671b01
JL		 1377 case Opt_xprt_tcp6:
1378 mountfamily = AF_INET6;
fdb66ff4 1379 case Opt_xprt_tcp:
0896a725 1380 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1381 break;
2cf7ff7a 1382 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1383 default:
f45663ce
CL		 1384 dfprintk(MOUNT, "NFS: unrecognized "
1385 "transport protocol\n");
d23c45fd 1386 return 0;
bf0fd768
CL		 1387 }
1388 break;
1389 case Opt_addr:
1390 string = match_strdup(args);
1391 if (string == NULL)
1392 goto out_nomem;
53a0b9c4
CL		 1393 mnt->nfs_server.addrlen =
1394 rpc_pton(string, strlen(string),
1395 (struct sockaddr *)
1396 &mnt->nfs_server.address,
1397 sizeof(mnt->nfs_server.address));
bf0fd768 1398 kfree(string);
53a0b9c4
CL		 1399 if (mnt->nfs_server.addrlen == 0)
1400 goto out_invalid_address;
bf0fd768
CL		 1401 break;
1402 case Opt_clientaddr:
1403 string = match_strdup(args);
1404 if (string == NULL)
1405 goto out_nomem;
fc601477 1406 kfree(mnt->client_address);
bf0fd768
CL		 1407 mnt->client_address = string;
1408 break;
33832034
CL		 1409 case Opt_mounthost:
1410 string = match_strdup(args);
1411 if (string == NULL)
1412 goto out_nomem;
fc601477 1413 kfree(mnt->mount_server.hostname);
33832034
CL		 1414 mnt->mount_server.hostname = string;
1415 break;
0ac83779 1416 case Opt_mountaddr:
bf0fd768
CL		 1417 string = match_strdup(args);
1418 if (string == NULL)
1419 goto out_nomem;
53a0b9c4
CL		 1420 mnt->mount_server.addrlen =
1421 rpc_pton(string, strlen(string),
1422 (struct sockaddr *)
1423 &mnt->mount_server.address,
1424 sizeof(mnt->mount_server.address));
bf0fd768 1425 kfree(string);
53a0b9c4
CL		 1426 if (mnt->mount_server.addrlen == 0)
1427 goto out_invalid_address;
bf0fd768 1428 break;
7973c1f1
TM		 1429 case Opt_lookupcache:
1430 string = match_strdup(args);
1431 if (string == NULL)
1432 goto out_nomem;
1433 token = match_token(string,
1434 nfs_lookupcache_tokens, args);
1435 kfree(string);
1436 switch (token) {
1437 case Opt_lookupcache_all:
1438 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1439 break;
1440 case Opt_lookupcache_positive:
1441 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1442 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1443 break;
1444 case Opt_lookupcache_none:
1445 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1446 break;
1447 default:
7973c1f1
TM		 1448 dfprintk(MOUNT, "NFS: invalid "
1449 "lookupcache argument\n");
d23c45fd 1450 return 0;
7973c1f1
TM		 1451 };
1452 break;
a6d5ff64
CL		 1453 case Opt_fscache_uniq:
1454 string = match_strdup(args);
1455 if (string == NULL)
1456 goto out_nomem;
1457 kfree(mnt->fscache_uniq);
1458 mnt->fscache_uniq = string;
1459 mnt->options |= NFS_OPTION_FSCACHE;
1460 break;
5eebde23
SJ		 1461 case Opt_local_lock:
1462 string = match_strdup(args);
1463 if (string == NULL)
1464 goto out_nomem;
1465 token = match_token(string, nfs_local_lock_tokens,
1466 args);
1467 kfree(string);
1468 switch (token) {
1469 case Opt_local_lock_all:
1470 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1471 NFS_MOUNT_LOCAL_FCNTL);
1472 break;
1473 case Opt_local_lock_flock:
1474 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1475 break;
1476 case Opt_local_lock_posix:
1477 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1478 break;
1479 case Opt_local_lock_none:
1480 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1481 NFS_MOUNT_LOCAL_FCNTL);
1482 break;
1483 default:
1484 dfprintk(MOUNT, "NFS: invalid "
1485 "local_lock argument\n");
1486 return 0;
1487 };
1488 break;
bf0fd768 1489
f45663ce
CL		 1490 /*
1491 * Special options
1492 */
1493 case Opt_sloppy:
1494 sloppy = 1;
1495 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1496 break;
bf0fd768
CL		 1497 case Opt_userspace:
1498 case Opt_deprecated:
d33e4dfe
CL		 1499 dfprintk(MOUNT, "NFS: ignoring mount option "
1500 "'%s'\n", p);
bf0fd768
CL		 1501 break;
1502
1503 default:
d23c45fd 1504 invalid_option = 1;
f45663ce
CL		 1505 dfprintk(MOUNT, "NFS: unrecognized mount option "
1506 "'%s'\n", p);
bf0fd768
CL		 1507 }
1508 }
1509
d23c45fd
CL		 1510 if (!sloppy && invalid_option)
1511 return 0;
1512
ee671b01
JL		 1513 /*
1514 * verify that any proto=/mountproto= options match the address
1515 * familiies in the addr=/mountaddr= options.
1516 */
1517 if (protofamily != AF_UNSPEC &&
1518 protofamily != mnt->nfs_server.address.ss_family)
1519 goto out_proto_mismatch;
1520
1521 if (mountfamily != AF_UNSPEC) {
1522 if (mnt->mount_server.addrlen) {
1523 if (mountfamily != mnt->mount_server.address.ss_family)
1524 goto out_mountproto_mismatch;
1525 } else {
1526 if (mountfamily != mnt->nfs_server.address.ss_family)
1527 goto out_mountproto_mismatch;
1528 }
1529 }
1530
bf0fd768
CL		 1531 return 1;
1532
ee671b01
JL		 1533out_mountproto_mismatch:
1534 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1535 "option\n");
1536 return 0;
1537out_proto_mismatch:
1538 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1539 return 0;
53a0b9c4
CL		 1540out_invalid_address:
1541 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1542 return 0;
d23c45fd 1543out_invalid_value:
53a0b9c4 1544 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1545 return 0;
bf0fd768
CL		 1546out_nomem:
1547 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1548 return 0;
f9c3a380
EP		 1549out_security_failure:
1550 free_secdata(secdata);
1551 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1552 return 0;
bf0fd768
CL		 1553}
1554
ec88f28d
CL		 1555/*
1556 * Match the requested auth flavors with the list returned by
1557 * the server. Returns zero and sets the mount's authentication
1558 * flavor on success; returns -EACCES if server does not support
1559 * the requested flavor.
1560 */
1561static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1562 struct nfs_mount_request *request)
1563{
1564 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1565
5eecfde6
CL		 1566 /*
1567 * Certain releases of Linux's mountd return an empty
1568 * flavor list. To prevent behavioral regression with
1569 * these servers (ie. rejecting mounts that used to
1570 * succeed), revert to pre-2.6.32 behavior (no checking)
1571 * if the returned flavor list is empty.
1572 */
1573 if (server_authlist_len == 0)
1574 return 0;
1575
ec88f28d
CL		 1576 /*
1577 * We avoid sophisticated negotiating here, as there are
1578 * plenty of cases where we can get it wrong, providing
1579 * either too little or too much security.
1580 *
1581 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1582 * flavor listed first. However, some servers list
1583 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1584 * preferred default, in args->auth_flavors[0] if user
1585 * didn't specify sec= mount option.
1586 */
1587 for (i = 0; i < args->auth_flavor_len; i++)
1588 for (j = 0; j < server_authlist_len; j++)
1589 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1590 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1591 request->auth_flavs[j]);
1592 args->auth_flavors[0] = request->auth_flavs[j];
1593 return 0;
1594 }
1595
1596 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1597 nfs_umount(request);
1598 return -EACCES;
1599}
1600
0076d7b7
CL		 1601/*
1602 * Use the remote server's MOUNT service to request the NFS file handle
1603 * corresponding to the provided path.
1604 */
1605static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1606 struct nfs_fh *root_fh)
1607{
ec88f28d
CL		 1608 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1609 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1610 struct nfs_mount_request request = {
1611 .sap = (struct sockaddr *)
1612 &args->mount_server.address,
1613 .dirpath = args->nfs_server.export_path,
1614 .protocol = args->mount_server.protocol,
1615 .fh = root_fh,
50a737f8 1616 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1617 .auth_flav_len = &server_authlist_len,
1618 .auth_flavs = server_authlist,
c5d120f8 1619 };
4c568017 1620 int status;
0076d7b7
CL		 1621
1622 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1623 switch (args->version) {
1624 default:
1625 args->mount_server.version = NFS_MNT3_VERSION;
1626 break;
1627 case 2:
1628 args->mount_server.version = NFS_MNT_VERSION;
1629 }
0076d7b7 1630 }
c5d120f8 1631 request.version = args->mount_server.version;
0076d7b7 1632
33832034 1633 if (args->mount_server.hostname)
c5d120f8 1634 request.hostname = args->mount_server.hostname;
33832034 1635 else
c5d120f8 1636 request.hostname = args->nfs_server.hostname;
33832034 1637
0076d7b7
CL		 1638 /*
1639 * Construct the mount server's address.
1640 */
4c568017 1641 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1642 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1643 args->nfs_server.addrlen);
1644 args->mount_server.addrlen = args->nfs_server.addrlen;
1645 }
c5d120f8 1646 request.salen = args->mount_server.addrlen;
f5855fec 1647 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1648
1649 /*
1650 * Now ask the mount server to map our export path
1651 * to a file handle.
1652 */
c5d120f8 1653 status = nfs_mount(&request);
ec88f28d
CL		 1654 if (status != 0) {
1655 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1656 request.hostname, status);
1657 return status;
1658 }
0076d7b7 1659
ec88f28d
CL		 1660 /*
1661 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1662 */
1663 if (args->mount_server.version != NFS_MNT3_VERSION)
1664 return 0;
1665 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1666}
1667
d1aa0825
CL		 1668static int nfs_parse_simple_hostname(const char *dev_name,
1669 char **hostname, size_t maxnamlen,
1670 char **export_path, size_t maxpathlen)
dc045898
CL		 1671{
1672 size_t len;
1673 char *colon, *comma;
1674
1675 colon = strchr(dev_name, ':');
1676 if (colon == NULL)
1677 goto out_bad_devname;
1678
1679 len = colon - dev_name;
1680 if (len > maxnamlen)
1681 goto out_hostname;
1682
1683 /* N.B. caller will free nfs_server.hostname in all cases */
1684 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1685 if (!*hostname)
1686 goto out_nomem;
1687
1688 /* kill possible hostname list: not supported */
1689 comma = strchr(*hostname, ',');
1690 if (comma != NULL) {
1691 if (comma == *hostname)
1692 goto out_bad_devname;
1693 *comma = '\0';
1694 }
1695
1696 colon++;
1697 len = strlen(colon);
1698 if (len > maxpathlen)
1699 goto out_path;
1700 *export_path = kstrndup(colon, len, GFP_KERNEL);
1701 if (!*export_path)
1702 goto out_nomem;
1703
1704 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1705 return 0;
1706
1707out_bad_devname:
1708 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1709 return -EINVAL;
1710
1711out_nomem:
1712 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1713 return -ENOMEM;
1714
1715out_hostname:
1716 dfprintk(MOUNT, "NFS: server hostname too long\n");
1717 return -ENAMETOOLONG;
1718
1719out_path:
1720 dfprintk(MOUNT, "NFS: export pathname too long\n");
1721 return -ENAMETOOLONG;
1722}
1723
d1aa0825
CL		 1724/*
1725 * Hostname has square brackets around it because it contains one or
1726 * more colons. We look for the first closing square bracket, and a
1727 * colon must follow it.
1728 */
1729static int nfs_parse_protected_hostname(const char *dev_name,
1730 char **hostname, size_t maxnamlen,
1731 char **export_path, size_t maxpathlen)
1732{
1733 size_t len;
1734 char *start, *end;
1735
1736 start = (char *)(dev_name + 1);
1737
1738 end = strchr(start, ']');
1739 if (end == NULL)
1740 goto out_bad_devname;
1741 if (*(end + 1) != ':')
1742 goto out_bad_devname;
1743
1744 len = end - start;
1745 if (len > maxnamlen)
1746 goto out_hostname;
1747
1748 /* N.B. caller will free nfs_server.hostname in all cases */
1749 *hostname = kstrndup(start, len, GFP_KERNEL);
1750 if (*hostname == NULL)
1751 goto out_nomem;
1752
1753 end += 2;
1754 len = strlen(end);
1755 if (len > maxpathlen)
1756 goto out_path;
1757 *export_path = kstrndup(end, len, GFP_KERNEL);
1758 if (!*export_path)
1759 goto out_nomem;
1760
1761 return 0;
1762
1763out_bad_devname:
1764 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1765 return -EINVAL;
1766
1767out_nomem:
1768 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1769 return -ENOMEM;
1770
1771out_hostname:
1772 dfprintk(MOUNT, "NFS: server hostname too long\n");
1773 return -ENAMETOOLONG;
1774
1775out_path:
1776 dfprintk(MOUNT, "NFS: export pathname too long\n");
1777 return -ENAMETOOLONG;
1778}
1779
1780/*
1781 * Split "dev_name" into "hostname:export_path".
1782 *
1783 * The leftmost colon demarks the split between the server's hostname
1784 * and the export path. If the hostname starts with a left square
1785 * bracket, then it may contain colons.
1786 *
1787 * Note: caller frees hostname and export path, even on error.
1788 */
1789static int nfs_parse_devname(const char *dev_name,
1790 char **hostname, size_t maxnamlen,
1791 char **export_path, size_t maxpathlen)
1792{
1793 if (*dev_name == '[')
1794 return nfs_parse_protected_hostname(dev_name,
1795 hostname, maxnamlen,
1796 export_path, maxpathlen);
1797
1798 return nfs_parse_simple_hostname(dev_name,
1799 hostname, maxnamlen,
1800 export_path, maxpathlen);
1801}
1802
f7b422b1 1803/*
54ceac45
DH		 1804 * Validate the NFS2/NFS3 mount data
1805 * - fills in the mount root filehandle
136d558c
CL		 1806 *
1807 * For option strings, user space handles the following behaviors:
1808 *
1809 * + DNS: mapping server host name to IP address ("addr=" option)
1810 *
1811 * + failure mode: how to behave if a mount request can't be handled
1812 * immediately ("fg/bg" option)
1813 *
1814 * + retry: how often to retry a mount request ("retry=" option)
1815 *
1816 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1817 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1818 */
2283f8d6
TT		 1819static int nfs_validate_mount_data(void *options,
1820 struct nfs_parsed_mount_data *args,
136d558c
CL		 1821 struct nfs_fh *mntfh,
1822 const char *dev_name)
f7b422b1 1823{
2283f8d6 1824 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1825 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1826
5df36e78
CL		 1827 if (data == NULL)
1828 goto out_no_data;
f7b422b1 1829
54ceac45 1830 switch (data->version) {
5df36e78
CL		 1831 case 1:
1832 data->namlen = 0;
1833 case 2:
1834 data->bsize = 0;
1835 case 3:
1836 if (data->flags & NFS_MOUNT_VER3)
1837 goto out_no_v3;
1838 data->root.size = NFS2_FHSIZE;
1839 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1840 case 4:
1841 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1842 goto out_no_sec;
1843 case 5:
1844 memset(data->context, 0, sizeof(data->context));
1845 case 6:
b7e24457
TM		 1846 if (data->flags & NFS_MOUNT_VER3) {
1847 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1848 goto out_invalid_fh;
5df36e78 1849 mntfh->size = data->root.size;
764302cc
CL		 1850 args->version = 3;
1851 } else {
5df36e78 1852 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1853 args->version = 2;
1854 }
5df36e78 1855
5df36e78
CL		 1856
1857 memcpy(mntfh->data, data->root.data, mntfh->size);
1858 if (mntfh->size < sizeof(mntfh->data))
1859 memset(mntfh->data + mntfh->size, 0,
1860 sizeof(mntfh->data) - mntfh->size);
6e88e061 1861
2283f8d6
TT		 1862 /*
1863 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1864 * can deal with.
1865 */
ff3525a5 1866 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1867 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1868 args->rsize = data->rsize;
1869 args->wsize = data->wsize;
2283f8d6
TT		 1870 args->timeo = data->timeo;
1871 args->retrans = data->retrans;
1872 args->acregmin = data->acregmin;
1873 args->acregmax = data->acregmax;
1874 args->acdirmin = data->acdirmin;
1875 args->acdirmax = data->acdirmax;
4c568017 1876
4cfd74fc 1877 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1878 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1879 if (!nfs_verify_server_address(sap))
4c568017
CL		 1880 goto out_no_address;
1881
2283f8d6 1882 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1883 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1884 /* N.B. caller will free nfs_server.hostname in all cases */
1885 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1886 args->namlen = data->namlen;
1887 args->bsize = data->bsize;
dd07c947
CL		 1888
1889 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1890 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1891 if (!args->nfs_server.hostname)
1892 goto out_nomem;
f9c3a380 1893
5eebde23
SJ		 1894 if (!(data->flags & NFS_MOUNT_NONLM))
1895 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1896 NFS_MOUNT_LOCAL_FCNTL);
1897 else
1898 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1899 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1900 /*
1901 * The legacy version 6 binary mount data from userspace has a
1902 * field used only to transport selinux information into the
1903 * the kernel. To continue to support that functionality we
1904 * have a touch of selinux knowledge here in the NFS code. The
1905 * userspace code converted context=blah to just blah so we are
1906 * converting back to the full string selinux understands.
1907 */
1908 if (data->context[0]){
1909#ifdef CONFIG_SECURITY_SELINUX
1910 int rc;
1911 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1912 if (!opts_str)
1913 return -ENOMEM;
1914 strcpy(opts_str, "context=");
1915 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1916 strcat(opts_str, &data->context[0]);
1917 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1918 kfree(opts_str);
1919 if (rc)
1920 return rc;
1921#else
1922 return -EINVAL;
1923#endif
1924 }
1925
5df36e78 1926 break;
136d558c 1927 default: {
136d558c 1928 int status;
136d558c 1929
2283f8d6
TT		 1930 if (nfs_parse_mount_options((char *)options, args) == 0)
1931 return -EINVAL;
136d558c 1932
4cfd74fc 1933 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1934 goto out_no_address;
1935
764302cc
CL		 1936 if (args->version == 4)
1937#ifdef CONFIG_NFS_V4
1938 return nfs4_validate_text_mount_data(options,
1939 args, dev_name);
1940#else
1941 goto out_v4_not_compiled;
1942#endif
1943
f5855fec 1944 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1945
259875ef
TM		 1946 nfs_set_mount_transport_protocol(args);
1947
dc045898
CL		 1948 status = nfs_parse_devname(dev_name,
1949 &args->nfs_server.hostname,
1950 PAGE_SIZE,
1951 &args->nfs_server.export_path,
1952 NFS_MAXPATHLEN);
1953 if (!status)
1954 status = nfs_try_mount(args, mntfh);
136d558c 1955
dc045898
CL		 1956 kfree(args->nfs_server.export_path);
1957 args->nfs_server.export_path = NULL;
136d558c 1958
136d558c 1959 if (status)
fdc6e2c8 1960 return status;
136d558c 1961
136d558c
CL		 1962 break;
1963 }
f7b422b1 1964 }
54ceac45
DH		 1965
1966#ifndef CONFIG_NFS_V3
8a6e5deb 1967 if (args->version == 3)
5df36e78
CL		 1968 goto out_v3_not_compiled;
1969#endif /* !CONFIG_NFS_V3 */
f7b422b1 1970
5df36e78 1971 return 0;
f7b422b1 1972
5df36e78
CL		 1973out_no_data:
1974 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1975 return -EINVAL;
54ceac45 1976
5df36e78
CL		 1977out_no_v3:
1978 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1979 data->version);
1980 return -EINVAL;
f7b422b1 1981
5df36e78
CL		 1982out_no_sec:
1983 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1984 return -EINVAL;
1985
5df36e78
CL		 1986#ifndef CONFIG_NFS_V3
1987out_v3_not_compiled:
1988 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1989 return -EPROTONOSUPPORT;
1990#endif /* !CONFIG_NFS_V3 */
1991
764302cc
CL		 1992#ifndef CONFIG_NFS_V4
1993out_v4_not_compiled:
1994 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1995 return -EPROTONOSUPPORT;
1996#endif /* !CONFIG_NFS_V4 */
1997
63649bd7
CG		 1998out_nomem:
1999 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2000 return -ENOMEM;
2001
5df36e78
CL		 2002out_no_address:
2003 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2004 return -EINVAL;
2005
2006out_invalid_fh:
2007 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2008 return -EINVAL;
f7b422b1
DH		 2009}
2010
48b605f8
JL		 2011static int
2012nfs_compare_remount_data(struct nfs_server *nfss,
2013 struct nfs_parsed_mount_data *data)
2014{
2015 if (data->flags != nfss->flags ||
2016 data->rsize != nfss->rsize ||
2017 data->wsize != nfss->wsize ||
2018 data->retrans != nfss->client->cl_timeout->to_retries ||
2019 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2020 data->acregmin != nfss->acregmin / HZ ||
2021 data->acregmax != nfss->acregmax / HZ ||
2022 data->acdirmin != nfss->acdirmin / HZ ||
2023 data->acdirmax != nfss->acdirmax / HZ ||
2024 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2025 data->nfs_server.port != nfss->port ||
48b605f8 2026 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2027 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2028 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2029 return -EINVAL;
2030
2031 return 0;
2032}
2033
2034static int
2035nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2036{
2037 int error;
2038 struct nfs_server *nfss = sb->s_fs_info;
2039 struct nfs_parsed_mount_data *data;
2040 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2041 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2042 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2043
2044 /*
2045 * Userspace mount programs that send binary options generally send
2046 * them populated with default values. We have no way to know which
2047 * ones were explicitly specified. Fall back to legacy behavior and
2048 * just return success.
2049 */
31c94469
MZ		 2050 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2051 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2052 options->version <= 6))))
48b605f8
JL		 2053 return 0;
2054
2055 data = kzalloc(sizeof(*data), GFP_KERNEL);
2056 if (data == NULL)
2057 return -ENOMEM;
2058
2059 /* fill out struct with values from existing mount */
2060 data->flags = nfss->flags;
2061 data->rsize = nfss->rsize;
2062 data->wsize = nfss->wsize;
2063 data->retrans = nfss->client->cl_timeout->to_retries;
2064 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2065 data->acregmin = nfss->acregmin / HZ;
2066 data->acregmax = nfss->acregmax / HZ;
2067 data->acdirmin = nfss->acdirmin / HZ;
2068 data->acdirmax = nfss->acdirmax / HZ;
2069 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2070 data->nfs_server.port = nfss->port;
48b605f8
JL		 2071 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2072 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2073 data->nfs_server.addrlen);
2074
2075 /* overwrite those values with any that were specified */
2076 error = nfs_parse_mount_options((char *)options, data);
2077 if (error < 0)
2078 goto out;
2079
2080 /* compare new mount options with old ones */
2081 error = nfs_compare_remount_data(nfss, data);
2082out:
2083 kfree(data);
2084 return error;
2085}
2086
f7b422b1 2087/*
54ceac45 2088 * Initialise the common bits of the superblock
f7b422b1 2089 */
54ceac45 2090static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2091{
54ceac45 2092 struct nfs_server *server = NFS_SB(sb);
5006a76c 2093
54ceac45 2094 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2095
54ceac45
DH		 2096 /* We probably want something more informative here */
2097 snprintf(sb->s_id, sizeof(sb->s_id),
2098 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2099
54ceac45
DH		 2100 if (sb->s_blocksize == 0)
2101 sb->s_blocksize = nfs_block_bits(server->wsize,
2102 &sb->s_blocksize_bits);
f7b422b1 2103
54ceac45
DH		 2104 if (server->flags & NFS_MOUNT_NOAC)
2105 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 2106
32a88aa1
JA		 2107 sb->s_bdi = &server->backing_dev_info;
2108
54ceac45 2109 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2110}
2111
2112/*
54ceac45 2113 * Finish setting up an NFS2/3 superblock
f7b422b1 2114 */
2283f8d6
TT		 2115static void nfs_fill_super(struct super_block *sb,
2116 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2117{
2118 struct nfs_server *server = NFS_SB(sb);
5006a76c 2119
54ceac45
DH		 2120 sb->s_blocksize_bits = 0;
2121 sb->s_blocksize = 0;
2122 if (data->bsize)
2123 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2124
8a6e5deb 2125 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2126 /* The VFS shouldn't apply the umask to mode bits. We will do
2127 * so ourselves when necessary.
2128 */
2129 sb->s_flags |= MS_POSIXACL;
2130 sb->s_time_gran = 1;
816724e6 2131 }
54ceac45
DH		 2132
2133 sb->s_op = &nfs_sops;
2134 nfs_initialise_sb(sb);
f7b422b1
DH		 2135}
2136
2137/*
54ceac45 2138 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2139 */
54ceac45
DH		 2140static void nfs_clone_super(struct super_block *sb,
2141 const struct super_block *old_sb)
f7b422b1 2142{
54ceac45
DH		 2143 struct nfs_server *server = NFS_SB(sb);
2144
2145 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2146 sb->s_blocksize = old_sb->s_blocksize;
2147 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2148
8a6e5deb 2149 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2150 /* The VFS shouldn't apply the umask to mode bits. We will do
2151 * so ourselves when necessary.
f7b422b1
DH		 2152 */
2153 sb->s_flags |= MS_POSIXACL;
f7b422b1 2154 sb->s_time_gran = 1;
f7b422b1
DH		 2155 }
2156
54ceac45
DH		 2157 sb->s_op = old_sb->s_op;
2158 nfs_initialise_sb(sb);
f7b422b1
DH		 2159}
2160
275a5d24
TM		 2161static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2162{
2163 const struct nfs_server *a = s->s_fs_info;
2164 const struct rpc_clnt *clnt_a = a->client;
2165 const struct rpc_clnt *clnt_b = b->client;
2166
2167 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2168 goto Ebusy;
2169 if (a->nfs_client != b->nfs_client)
2170 goto Ebusy;
2171 if (a->flags != b->flags)
2172 goto Ebusy;
2173 if (a->wsize != b->wsize)
2174 goto Ebusy;
2175 if (a->rsize != b->rsize)
2176 goto Ebusy;
2177 if (a->acregmin != b->acregmin)
2178 goto Ebusy;
2179 if (a->acregmax != b->acregmax)
2180 goto Ebusy;
2181 if (a->acdirmin != b->acdirmin)
2182 goto Ebusy;
2183 if (a->acdirmax != b->acdirmax)
2184 goto Ebusy;
2185 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2186 goto Ebusy;
e89a5a43 2187 return 1;
275a5d24 2188Ebusy:
e89a5a43
TM		 2189 return 0;
2190}
2191
2192struct nfs_sb_mountdata {
2193 struct nfs_server *server;
2194 int mntflags;
2195};
2196
2197static int nfs_set_super(struct super_block *s, void *data)
2198{
2199 struct nfs_sb_mountdata *sb_mntdata = data;
2200 struct nfs_server *server = sb_mntdata->server;
2201 int ret;
2202
2203 s->s_flags = sb_mntdata->mntflags;
2204 s->s_fs_info = server;
2205 ret = set_anon_super(s, server);
2206 if (ret == 0)
2207 server->s_dev = s->s_dev;
2208 return ret;
2209}
2210
fd00a8ff
CL		 2211static int nfs_compare_super_address(struct nfs_server *server1,
2212 struct nfs_server *server2)
2213{
2214 struct sockaddr *sap1, *sap2;
2215
2216 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2217 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2218
2219 if (sap1->sa_family != sap2->sa_family)
2220 return 0;
2221
2222 switch (sap1->sa_family) {
2223 case AF_INET: {
2224 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2225 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2226 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2227 return 0;
2228 if (sin1->sin_port != sin2->sin_port)
2229 return 0;
2230 break;
2231 }
2232 case AF_INET6: {
2233 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2234 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2235 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2236 return 0;
2237 if (sin1->sin6_port != sin2->sin6_port)
2238 return 0;
2239 break;
2240 }
2241 default:
2242 return 0;
2243 }
2244
2245 return 1;
2246}
2247
e89a5a43
TM		 2248static int nfs_compare_super(struct super_block *sb, void *data)
2249{
2250 struct nfs_sb_mountdata *sb_mntdata = data;
2251 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2252 int mntflags = sb_mntdata->mntflags;
2253
fd00a8ff 2254 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2255 return 0;
2256 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2257 if (old->flags & NFS_MOUNT_UNSHARED)
2258 return 0;
2259 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2260 return 0;
2261 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2262}
2263
fa799759
MS		 2264static int nfs_bdi_register(struct nfs_server *server)
2265{
2266 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2267}
2268
816724e6
TM		 2269static int nfs_get_sb(struct file_system_type *fs_type,
2270 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2271{
f7b422b1
DH		 2272 struct nfs_server *server = NULL;
2273 struct super_block *s;
33852a1f
TM		 2274 struct nfs_parsed_mount_data *data;
2275 struct nfs_fh *mntfh;
54ceac45 2276 struct dentry *mntroot;
75180df2 2277 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2278 struct nfs_sb_mountdata sb_mntdata = {
2279 .mntflags = flags,
2280 };
33852a1f
TM		 2281 int error = -ENOMEM;
2282
1e657bd5 2283 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2284 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2285 if (data == NULL || mntfh == NULL)
2286 goto out_free_fh;
f7b422b1 2287
33852a1f 2288 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2289
54ceac45 2290 /* Validate the mount data */
33852a1f 2291 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2292 if (error < 0)
0655960f 2293 goto out;
f7b422b1 2294
764302cc
CL		 2295#ifdef CONFIG_NFS_V4
2296 if (data->version == 4) {
2297 error = nfs4_try_mount(flags, dev_name, data, mnt);
2298 kfree(data->client_address);
9699eda6 2299 kfree(data->nfs_server.export_path);
764302cc
CL		 2300 goto out;
2301 }
2302#endif /* CONFIG_NFS_V4 */
2303
54ceac45 2304 /* Get a volume representation */
33852a1f 2305 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2306 if (IS_ERR(server)) {
2307 error = PTR_ERR(server);
0655960f 2308 goto out;
f7b422b1 2309 }
e89a5a43 2310 sb_mntdata.server = server;
f7b422b1 2311
75180df2
TM		 2312 if (server->flags & NFS_MOUNT_UNSHARED)
2313 compare_super = NULL;
2314
54ceac45 2315 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2316 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2317 if (IS_ERR(s)) {
2318 error = PTR_ERR(s);
54ceac45 2319 goto out_err_nosb;
816724e6
TM		 2320 }
2321
54ceac45
DH		 2322 if (s->s_fs_info != server) {
2323 nfs_free_server(server);
2324 server = NULL;
fa799759
MS		 2325 } else {
2326 error = nfs_bdi_register(server);
2327 if (error)
cfbc0683 2328 goto error_splat_bdi;
54ceac45 2329 }
f7b422b1 2330
54ceac45
DH		 2331 if (!s->s_root) {
2332 /* initial superblock/root creation */
33852a1f 2333 nfs_fill_super(s, data);
2df54806
DH		 2334 nfs_fscache_get_super_cookie(
2335 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2336 }
f7b422b1 2337
33852a1f 2338 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2339 if (IS_ERR(mntroot)) {
2340 error = PTR_ERR(mntroot);
2341 goto error_splat_super;
f7b422b1 2342 }
816724e6 2343
33852a1f 2344 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2345 if (error)
2346 goto error_splat_root;
2347
54ceac45
DH		 2348 s->s_flags |= MS_ACTIVE;
2349 mnt->mnt_sb = s;
2350 mnt->mnt_root = mntroot;
0655960f
CL		 2351 error = 0;
2352
2353out:
33852a1f
TM		 2354 kfree(data->nfs_server.hostname);
2355 kfree(data->mount_server.hostname);
08734048 2356 kfree(data->fscache_uniq);
33852a1f
TM		 2357 security_free_mnt_opts(&data->lsm_opts);
2358out_free_fh:
b157b06c 2359 nfs_free_fhandle(mntfh);
33852a1f 2360 kfree(data);
0655960f 2361 return error;
816724e6 2362
54ceac45
DH		 2363out_err_nosb:
2364 nfs_free_server(server);
0655960f 2365 goto out;
54ceac45 2366
f9c3a380
EP		 2367error_splat_root:
2368 dput(mntroot);
54ceac45 2369error_splat_super:
cfbc0683
N		 2370 if (server && !s->s_root)
2371 bdi_unregister(&server->backing_dev_info);
2372error_splat_bdi:
6f5bbff9 2373 deactivate_locked_super(s);
0655960f 2374 goto out;
f7b422b1
DH		 2375}
2376
387c149b
TM		 2377/*
2378 * Ensure that we unregister the bdi before kill_anon_super
2379 * releases the device name
2380 */
2381static void nfs_put_super(struct super_block *s)
2382{
2383 struct nfs_server *server = NFS_SB(s);
2384
2385 bdi_unregister(&server->backing_dev_info);
2386}
2387
54ceac45
DH		 2388/*
2389 * Destroy an NFS2/3 superblock
2390 */
f7b422b1
DH		 2391static void nfs_kill_super(struct super_block *s)
2392{
2393 struct nfs_server *server = NFS_SB(s);
2394
2395 kill_anon_super(s);
08734048 2396 nfs_fscache_release_super_cookie(s);
54ceac45 2397 nfs_free_server(server);
f7b422b1
DH		 2398}
2399
54ceac45
DH		 2400/*
2401 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2402 */
31f43471
AV		 2403static struct dentry *
2404nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2405 const char *dev_name, void *raw_data)
f7b422b1
DH		 2406{
2407 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2408 struct super_block *s;
2409 struct nfs_server *server;
2410 struct dentry *mntroot;
75180df2 2411 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2412 struct nfs_sb_mountdata sb_mntdata = {
2413 .mntflags = flags,
2414 };
54ceac45 2415 int error;
f7b422b1 2416
31f43471 2417 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2418
54ceac45
DH		 2419 /* create a new volume representation */
2420 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2421 if (IS_ERR(server)) {
2422 error = PTR_ERR(server);
2423 goto out_err_noserver;
2424 }
e89a5a43 2425 sb_mntdata.server = server;
8fa5c000 2426
75180df2
TM		 2427 if (server->flags & NFS_MOUNT_UNSHARED)
2428 compare_super = NULL;
2429
54ceac45 2430 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2431 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2432 if (IS_ERR(s)) {
2433 error = PTR_ERR(s);
2434 goto out_err_nosb;
2435 }
5006a76c 2436
54ceac45
DH		 2437 if (s->s_fs_info != server) {
2438 nfs_free_server(server);
2439 server = NULL;
fa799759
MS		 2440 } else {
2441 error = nfs_bdi_register(server);
2442 if (error)
cfbc0683 2443 goto error_splat_bdi;
f7b422b1 2444 }
24c8dbbb 2445
54ceac45
DH		 2446 if (!s->s_root) {
2447 /* initial superblock/root creation */
54ceac45 2448 nfs_clone_super(s, data->sb);
2df54806 2449 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2450 }
f7b422b1 2451
54ceac45
DH		 2452 mntroot = nfs_get_root(s, data->fh);
2453 if (IS_ERR(mntroot)) {
2454 error = PTR_ERR(mntroot);
2455 goto error_splat_super;
f7b422b1 2456 }
e9cc6c23 2457 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2458 dput(mntroot);
2459 error = -ESTALE;
2460 goto error_splat_super;
2461 }
f7b422b1 2462
54ceac45 2463 s->s_flags |= MS_ACTIVE;
f7b422b1 2464
f9c3a380
EP		 2465 /* clone any lsm security options from the parent to the new sb */
2466 security_sb_clone_mnt_opts(data->sb, s);
2467
31f43471
AV		 2468 dprintk("<-- nfs_xdev_mount() = 0\n");
2469 return mntroot;
24c8dbbb 2470
54ceac45
DH		 2471out_err_nosb:
2472 nfs_free_server(server);
2473out_err_noserver:
31f43471
AV		 2474 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2475 return ERR_PTR(error);
f7b422b1 2476
54ceac45 2477error_splat_super:
cfbc0683
N		 2478 if (server && !s->s_root)
2479 bdi_unregister(&server->backing_dev_info);
2480error_splat_bdi:
6f5bbff9 2481 deactivate_locked_super(s);
31f43471
AV		 2482 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2483 return ERR_PTR(error);
f7b422b1
DH		 2484}
2485
54ceac45
DH		 2486#ifdef CONFIG_NFS_V4
2487
f7b422b1 2488/*
54ceac45 2489 * Finish setting up a cloned NFS4 superblock
f7b422b1 2490 */
54ceac45
DH		 2491static void nfs4_clone_super(struct super_block *sb,
2492 const struct super_block *old_sb)
f7b422b1 2493{
54ceac45
DH		 2494 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2495 sb->s_blocksize = old_sb->s_blocksize;
2496 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2497 sb->s_time_gran = 1;
54ceac45 2498 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2499 /*
2500 * The VFS shouldn't apply the umask to mode bits. We will do
2501 * so ourselves when necessary.
2502 */
2503 sb->s_flags |= MS_POSIXACL;
54ceac45 2504 nfs_initialise_sb(sb);
f7b422b1
DH		 2505}
2506
54ceac45
DH		 2507/*
2508 * Set up an NFS4 superblock
2509 */
2510static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2511{
54ceac45
DH		 2512 sb->s_time_gran = 1;
2513 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2514 /*
2515 * The VFS shouldn't apply the umask to mode bits. We will do
2516 * so ourselves when necessary.
2517 */
2518 sb->s_flags |= MS_POSIXACL;
54ceac45 2519 nfs_initialise_sb(sb);
f7b422b1
DH		 2520}
2521
01c3f052
TM		 2522static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2523{
5eebde23
SJ		 2524 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2525 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2526}
2527
7630c852
CL		 2528static int nfs4_validate_text_mount_data(void *options,
2529 struct nfs_parsed_mount_data *args,
2530 const char *dev_name)
2531{
2532 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2533
f5855fec 2534 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2535
2536 nfs_validate_transport_protocol(args);
2537
2538 nfs4_validate_mount_flags(args);
2539
2ecda72b
TM		 2540 if (args->version != 4) {
2541 dfprintk(MOUNT,
2542 "NFS4: Illegal mount version\n");
2543 return -EINVAL;
2544 }
2545
7630c852
CL		 2546 if (args->auth_flavor_len > 1) {
2547 dfprintk(MOUNT,
2548 "NFS4: Too many RPC auth flavours specified\n");
2549 return -EINVAL;
2550 }
2551
2552 if (args->client_address == NULL) {
2553 dfprintk(MOUNT,
2554 "NFS4: mount program didn't pass callback address\n");
2555 return -EINVAL;
2556 }
2557
2558 return nfs_parse_devname(dev_name,
2559 &args->nfs_server.hostname,
2560 NFS4_MAXNAMLEN,
2561 &args->nfs_server.export_path,
2562 NFS4_MAXPATHLEN);
2563}
2564
f0768ebd
CL		 2565/*
2566 * Validate NFSv4 mount options
2567 */
91ea40b9
TT		 2568static int nfs4_validate_mount_data(void *options,
2569 struct nfs_parsed_mount_data *args,
2570 const char *dev_name)
f0768ebd 2571{
4cfd74fc 2572 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2573 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2574 char *c;
2575
2576 if (data == NULL)
2577 goto out_no_data;
2578
2579 switch (data->version) {
2580 case 1:
4c568017
CL		 2581 if (data->host_addrlen > sizeof(args->nfs_server.address))
2582 goto out_no_address;
2583 if (data->host_addrlen == 0)
f0768ebd 2584 goto out_no_address;
4c568017 2585 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2586 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2587 return -EFAULT;
4cfd74fc 2588 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2589 goto out_no_address;
2590
6738b251
CL		 2591 if (data->auth_flavourlen) {
2592 if (data->auth_flavourlen > 1)
2593 goto out_inval_auth;
20c71f5e 2594 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2595 data->auth_flavours,
20c71f5e 2596 sizeof(args->auth_flavors[0])))
f0768ebd 2597 return -EFAULT;
f0768ebd
CL		 2598 }
2599
2600 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2601 if (IS_ERR(c))
2602 return PTR_ERR(c);
91ea40b9 2603 args->nfs_server.hostname = c;
f0768ebd
CL		 2604
2605 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2606 if (IS_ERR(c))
2607 return PTR_ERR(c);
91ea40b9
TT		 2608 args->nfs_server.export_path = c;
2609 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2610
2611 c = strndup_user(data->client_addr.data, 16);
2612 if (IS_ERR(c))
2613 return PTR_ERR(c);
91ea40b9
TT		 2614 args->client_address = c;
2615
2616 /*
2617 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2618 * can deal with.
2619 */
2620
2621 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2622 args->rsize = data->rsize;
2623 args->wsize = data->wsize;
2624 args->timeo = data->timeo;
2625 args->retrans = data->retrans;
2626 args->acregmin = data->acregmin;
2627 args->acregmax = data->acregmax;
2628 args->acdirmin = data->acdirmin;
2629 args->acdirmax = data->acdirmax;
2630 args->nfs_server.protocol = data->proto;
259875ef 2631 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2632
2633 break;
7630c852 2634 default:
91ea40b9 2635 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2636 return -EINVAL;
2637
4cfd74fc 2638 if (!nfs_verify_server_address(sap))
80071225 2639 return -EINVAL;
dc045898 2640
7630c852 2641 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2642 }
2643
2644 return 0;
2645
2646out_no_data:
2647 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2648 return -EINVAL;
2649
2650out_inval_auth:
2651 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2652 data->auth_flavourlen);
2653 return -EINVAL;
2654
2655out_no_address:
2656 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2657 return -EINVAL;
f0768ebd
CL		 2658}
2659
54ceac45 2660/*
c02d7adf 2661 * Get the superblock for the NFS4 root partition
54ceac45 2662 */
31f43471
AV		 2663static struct dentry *
2664nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2665 const char *dev_name, void *raw_data)
f7b422b1 2666{
c02d7adf 2667 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2668 struct super_block *s;
2669 struct nfs_server *server;
33852a1f 2670 struct nfs_fh *mntfh;
54ceac45 2671 struct dentry *mntroot;
75180df2 2672 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2673 struct nfs_sb_mountdata sb_mntdata = {
2674 .mntflags = flags,
2675 };
33852a1f
TM		 2676 int error = -ENOMEM;
2677
b157b06c 2678 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2679 if (data == NULL || mntfh == NULL)
2680 goto out_free_fh;
f7b422b1 2681
33852a1f 2682 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2683
54ceac45 2684 /* Get a volume representation */
33852a1f 2685 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2686 if (IS_ERR(server)) {
2687 error = PTR_ERR(server);
29eb981a 2688 goto out;
f7b422b1 2689 }
e89a5a43 2690 sb_mntdata.server = server;
f7b422b1 2691
75180df2
TM		 2692 if (server->flags & NFS4_MOUNT_UNSHARED)
2693 compare_super = NULL;
2694
54ceac45 2695 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2696 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2697 if (IS_ERR(s)) {
2698 error = PTR_ERR(s);
f7b422b1 2699 goto out_free;
816724e6
TM		 2700 }
2701
5dd3177a
TM		 2702 if (s->s_fs_info != server) {
2703 nfs_free_server(server);
2704 server = NULL;
fa799759
MS		 2705 } else {
2706 error = nfs_bdi_register(server);
2707 if (error)
cfbc0683 2708 goto error_splat_bdi;
5dd3177a
TM		 2709 }
2710
54ceac45
DH		 2711 if (!s->s_root) {
2712 /* initial superblock/root creation */
54ceac45 2713 nfs4_fill_super(s);
2df54806
DH		 2714 nfs_fscache_get_super_cookie(
2715 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2716 }
f7b422b1 2717
33852a1f 2718 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2719 if (IS_ERR(mntroot)) {
2720 error = PTR_ERR(mntroot);
2721 goto error_splat_super;
f7b422b1 2722 }
54ceac45 2723
33852a1f 2724 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2725 if (error)
2726 goto error_splat_root;
2727
f7b422b1 2728 s->s_flags |= MS_ACTIVE;
31f43471
AV		 2729
2730 security_free_mnt_opts(&data->lsm_opts);
2731 nfs_free_fhandle(mntfh);
2732 return mntroot;
29eb981a
CL		 2733
2734out:
33852a1f
TM		 2735 security_free_mnt_opts(&data->lsm_opts);
2736out_free_fh:
b157b06c 2737 nfs_free_fhandle(mntfh);
31f43471 2738 return ERR_PTR(error);
54ceac45 2739
f7b422b1 2740out_free:
54ceac45 2741 nfs_free_server(server);
29eb981a 2742 goto out;
54ceac45 2743
46c8ac74
EP		 2744error_splat_root:
2745 dput(mntroot);
54ceac45 2746error_splat_super:
cfbc0683
N		 2747 if (server && !s->s_root)
2748 bdi_unregister(&server->backing_dev_info);
2749error_splat_bdi:
6f5bbff9 2750 deactivate_locked_super(s);
29eb981a 2751 goto out;
f7b422b1
DH		 2752}
2753
c02d7adf
TM		 2754static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2755 int flags, void *data, const char *hostname)
2756{
2757 struct vfsmount *root_mnt;
2758 char *root_devname;
2759 size_t len;
2760
2761 len = strlen(hostname) + 3;
2762 root_devname = kmalloc(len, GFP_KERNEL);
2763 if (root_devname == NULL)
2764 return ERR_PTR(-ENOMEM);
2765 snprintf(root_devname, len, "%s:/", hostname);
2766 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2767 kfree(root_devname);
2768 return root_mnt;
2769}
2770
b88f8a54
TM		 2771static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2772{
2773 char *page = (char *) __get_free_page(GFP_KERNEL);
2774 char *devname, *tmp;
2775
2776 if (page == NULL)
2777 return;
2778 devname = nfs_path(path->mnt->mnt_devname,
2779 path->mnt->mnt_root, path->dentry,
2780 page, PAGE_SIZE);
cdd29ecf 2781 if (IS_ERR(devname))
b88f8a54
TM		 2782 goto out_freepage;
2783 tmp = kstrdup(devname, GFP_KERNEL);
2784 if (tmp == NULL)
2785 goto out_freepage;
2786 kfree(mnt->mnt_devname);
2787 mnt->mnt_devname = tmp;
2788out_freepage:
2789 free_page((unsigned long)page);
2790}
2791
ce587e07
TM		 2792struct nfs_referral_count {
2793 struct list_head list;
2794 const struct task_struct *task;
2795 unsigned int referral_count;
2796};
2797
2798static LIST_HEAD(nfs_referral_count_list);
2799static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2800
2801static struct nfs_referral_count *nfs_find_referral_count(void)
2802{
2803 struct nfs_referral_count *p;
2804
2805 list_for_each_entry(p, &nfs_referral_count_list, list) {
2806 if (p->task == current)
2807 return p;
2808 }
2809 return NULL;
2810}
2811
2812#define NFS_MAX_NESTED_REFERRALS 2
2813
2814static int nfs_referral_loop_protect(void)
2815{
2816 struct nfs_referral_count *p, *new;
2817 int ret = -ENOMEM;
2818
2819 new = kmalloc(sizeof(*new), GFP_KERNEL);
2820 if (!new)
2821 goto out;
2822 new->task = current;
2823 new->referral_count = 1;
2824
2825 ret = 0;
2826 spin_lock(&nfs_referral_count_list_lock);
2827 p = nfs_find_referral_count();
2828 if (p != NULL) {
2829 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2830 ret = -ELOOP;
2831 else
2832 p->referral_count++;
2833 } else {
2834 list_add(&new->list, &nfs_referral_count_list);
2835 new = NULL;
2836 }
2837 spin_unlock(&nfs_referral_count_list_lock);
2838 kfree(new);
2839out:
2840 return ret;
2841}
2842
2843static void nfs_referral_loop_unprotect(void)
2844{
2845 struct nfs_referral_count *p;
2846
2847 spin_lock(&nfs_referral_count_list_lock);
2848 p = nfs_find_referral_count();
2849 p->referral_count--;
2850 if (p->referral_count == 0)
2851 list_del(&p->list);
2852 else
2853 p = NULL;
2854 spin_unlock(&nfs_referral_count_list_lock);
2855 kfree(p);
2856}
2857
c02d7adf
TM		 2858static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2859 const char *export_path, struct vfsmount *mnt_target)
2860{
04ffdbe2 2861 struct nameidata *nd = NULL;
a2770d86 2862 struct mnt_namespace *ns_private;
c02d7adf
TM		 2863 struct super_block *s;
2864 int ret;
2865
04ffdbe2
TM		 2866 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2867 if (nd == NULL)
2868 return -ENOMEM;
2869
a2770d86
LT		 2870 ns_private = create_mnt_ns(root_mnt);
2871 ret = PTR_ERR(ns_private);
2872 if (IS_ERR(ns_private))
2873 goto out_mntput;
2874
ce587e07
TM		 2875 ret = nfs_referral_loop_protect();
2876 if (ret != 0)
2877 goto out_put_mnt_ns;
2878
c02d7adf 2879 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
04ffdbe2 2880 export_path, LOOKUP_FOLLOW, nd);
c02d7adf 2881
ce587e07 2882 nfs_referral_loop_unprotect();
a2770d86
LT		 2883 put_mnt_ns(ns_private);
2884
c02d7adf
TM		 2885 if (ret != 0)
2886 goto out_err;
2887
04ffdbe2 2888 s = nd->path.mnt->mnt_sb;
c02d7adf
TM		 2889 atomic_inc(&s->s_active);
2890 mnt_target->mnt_sb = s;
04ffdbe2 2891 mnt_target->mnt_root = dget(nd->path.dentry);
c02d7adf 2892
b88f8a54 2893 /* Correct the device pathname */
04ffdbe2 2894 nfs_fix_devname(&nd->path, mnt_target);
b88f8a54 2895
04ffdbe2
TM		 2896 path_put(&nd->path);
2897 kfree(nd);
c02d7adf
TM		 2898 down_write(&s->s_umount);
2899 return 0;
ce587e07
TM		 2900out_put_mnt_ns:
2901 put_mnt_ns(ns_private);
c02d7adf
TM		 2902out_mntput:
2903 mntput(root_mnt);
2904out_err:
04ffdbe2 2905 kfree(nd);
c02d7adf
TM		 2906 return ret;
2907}
2908
a6fe23be
CL		 2909static int nfs4_try_mount(int flags, const char *dev_name,
2910 struct nfs_parsed_mount_data *data,
2911 struct vfsmount *mnt)
2912{
2913 char *export_path;
2914 struct vfsmount *root_mnt;
2915 int error;
2916
2917 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2918
2919 export_path = data->nfs_server.export_path;
2920 data->nfs_server.export_path = "/";
2921 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2922 data->nfs_server.hostname);
2923 data->nfs_server.export_path = export_path;
2924
2925 error = PTR_ERR(root_mnt);
2926 if (IS_ERR(root_mnt))
2927 goto out;
2928
2929 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2930
2931out:
2932 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2933 error != 0 ? " [error]" : "");
2934 return error;
2935}
2936
c02d7adf
TM		 2937/*
2938 * Get the superblock for an NFS4 mountpoint
2939 */
2940static int nfs4_get_sb(struct file_system_type *fs_type,
2941 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2942{
2943 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2944 int error = -ENOMEM;
2945
c5811dbd 2946 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2947 if (data == NULL)
2948 goto out_free_data;
2949
2950 /* Validate the mount data */
2951 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2952 if (error < 0)
2953 goto out;
2954
a6fe23be 2955 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2956
2957out:
2958 kfree(data->client_address);
2959 kfree(data->nfs_server.export_path);
2960 kfree(data->nfs_server.hostname);
2961 kfree(data->fscache_uniq);
2962out_free_data:
2963 kfree(data);
2964 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2965 error != 0 ? " [error]" : "");
2966 return error;
2967}
2968
f7b422b1
DH		 2969static void nfs4_kill_super(struct super_block *sb)
2970{
2971 struct nfs_server *server = NFS_SB(sb);
2972
0f3e66c6 2973 dprintk("--> %s\n", __func__);
515d8611 2974 nfs_super_return_all_delegations(sb);
f7b422b1 2975 kill_anon_super(sb);
08734048 2976 nfs_fscache_release_super_cookie(sb);
54ceac45 2977 nfs_free_server(server);
0f3e66c6 2978 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2979}
2980
2981/*
54ceac45 2982 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2983 */
31f43471
AV		 2984static struct dentry *
2985nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2986 const char *dev_name, void *raw_data)
f7b422b1 2987{
54ceac45
DH		 2988 struct nfs_clone_mount *data = raw_data;
2989 struct super_block *s;
2990 struct nfs_server *server;
2991 struct dentry *mntroot;
75180df2 2992 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2993 struct nfs_sb_mountdata sb_mntdata = {
2994 .mntflags = flags,
2995 };
54ceac45 2996 int error;
f7b422b1 2997
31f43471 2998 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2999
54ceac45
DH		 3000 /* create a new volume representation */
3001 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
3002 if (IS_ERR(server)) {
3003 error = PTR_ERR(server);
3004 goto out_err_noserver;
f7b422b1 3005 }
e89a5a43 3006 sb_mntdata.server = server;
f7b422b1 3007
75180df2
TM		 3008 if (server->flags & NFS4_MOUNT_UNSHARED)
3009 compare_super = NULL;
3010
54ceac45 3011 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3012 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3013 if (IS_ERR(s)) {
3014 error = PTR_ERR(s);
3015 goto out_err_nosb;
f7b422b1 3016 }
f7b422b1 3017
54ceac45
DH		 3018 if (s->s_fs_info != server) {
3019 nfs_free_server(server);
3020 server = NULL;
fa799759
MS		 3021 } else {
3022 error = nfs_bdi_register(server);
3023 if (error)
cfbc0683 3024 goto error_splat_bdi;
54ceac45 3025 }
f7b422b1 3026
54ceac45
DH		 3027 if (!s->s_root) {
3028 /* initial superblock/root creation */
54ceac45 3029 nfs4_clone_super(s, data->sb);
2df54806 3030 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 3031 }
f7b422b1 3032
54ceac45
DH		 3033 mntroot = nfs4_get_root(s, data->fh);
3034 if (IS_ERR(mntroot)) {
3035 error = PTR_ERR(mntroot);
3036 goto error_splat_super;
3037 }
e9cc6c23
TM		 3038 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3039 dput(mntroot);
3040 error = -ESTALE;
3041 goto error_splat_super;
3042 }
f7b422b1 3043
54ceac45 3044 s->s_flags |= MS_ACTIVE;
54ceac45 3045
46c8ac74
EP		 3046 security_sb_clone_mnt_opts(data->sb, s);
3047
31f43471
AV		 3048 dprintk("<-- nfs4_xdev_mount() = 0\n");
3049 return mntroot;
54ceac45
DH		 3050
3051out_err_nosb:
3052 nfs_free_server(server);
3053out_err_noserver:
31f43471
AV		 3054 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3055 return ERR_PTR(error);
54ceac45
DH		 3056
3057error_splat_super:
cfbc0683
N		 3058 if (server && !s->s_root)
3059 bdi_unregister(&server->backing_dev_info);
3060error_splat_bdi:
6f5bbff9 3061 deactivate_locked_super(s);
31f43471
AV		 3062 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3063 return ERR_PTR(error);
f7b422b1
DH		 3064}
3065
31f43471
AV		 3066static struct dentry *
3067nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3068 const char *dev_name, void *raw_data)
f7b422b1
DH		 3069{
3070 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 3071 struct super_block *s;
3072 struct nfs_server *server;
3073 struct dentry *mntroot;
4f727296 3074 struct nfs_fh *mntfh;
75180df2 3075 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 3076 struct nfs_sb_mountdata sb_mntdata = {
3077 .mntflags = flags,
3078 };
4f727296 3079 int error = -ENOMEM;
54ceac45
DH		 3080
3081 dprintk("--> nfs4_referral_get_sb()\n");
3082
4f727296
TM		 3083 mntfh = nfs_alloc_fhandle();
3084 if (mntfh == NULL)
3085 goto out_err_nofh;
3086
54ceac45 3087 /* create a new volume representation */
4f727296 3088 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3089 if (IS_ERR(server)) {
3090 error = PTR_ERR(server);
3091 goto out_err_noserver;
3092 }
e89a5a43 3093 sb_mntdata.server = server;
54ceac45 3094
75180df2
TM		 3095 if (server->flags & NFS4_MOUNT_UNSHARED)
3096 compare_super = NULL;
3097
54ceac45 3098 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3099 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3100 if (IS_ERR(s)) {
3101 error = PTR_ERR(s);
3102 goto out_err_nosb;
3103 }
3104
3105 if (s->s_fs_info != server) {
3106 nfs_free_server(server);
3107 server = NULL;
fa799759
MS		 3108 } else {
3109 error = nfs_bdi_register(server);
3110 if (error)
cfbc0683 3111 goto error_splat_bdi;
54ceac45
DH		 3112 }
3113
3114 if (!s->s_root) {
3115 /* initial superblock/root creation */
54ceac45 3116 nfs4_fill_super(s);
2df54806 3117 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3118 }
3119
4f727296 3120 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 3121 if (IS_ERR(mntroot)) {
3122 error = PTR_ERR(mntroot);
3123 goto error_splat_super;
3124 }
e9cc6c23
TM		 3125 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3126 dput(mntroot);
3127 error = -ESTALE;
3128 goto error_splat_super;
3129 }
54ceac45
DH		 3130
3131 s->s_flags |= MS_ACTIVE;
54ceac45 3132
46c8ac74
EP		 3133 security_sb_clone_mnt_opts(data->sb, s);
3134
4f727296 3135 nfs_free_fhandle(mntfh);
54ceac45 3136 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3137 return mntroot;
54ceac45
DH		 3138
3139out_err_nosb:
3140 nfs_free_server(server);
3141out_err_noserver:
4f727296
TM		 3142 nfs_free_fhandle(mntfh);
3143out_err_nofh:
54ceac45 3144 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3145 return ERR_PTR(error);
54ceac45
DH		 3146
3147error_splat_super:
cfbc0683
N		 3148 if (server && !s->s_root)
3149 bdi_unregister(&server->backing_dev_info);
3150error_splat_bdi:
6f5bbff9 3151 deactivate_locked_super(s);
4f727296 3152 nfs_free_fhandle(mntfh);
54ceac45 3153 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3154 return ERR_PTR(error);
f7b422b1
DH		 3155}
3156
c02d7adf
TM		 3157/*
3158 * Create an NFS4 server record on referral traversal
3159 */
3160static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3161 int flags, const char *dev_name, void *raw_data,
3162 struct vfsmount *mnt)
3163{
3164 struct nfs_clone_mount *data = raw_data;
3165 char *export_path;
3166 struct vfsmount *root_mnt;
3167 int error;
3168
3169 dprintk("--> nfs4_referral_get_sb()\n");
3170
3171 export_path = data->mnt_path;
3172 data->mnt_path = "/";
3173
3174 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3175 flags, data, data->hostname);
3176 data->mnt_path = export_path;
3177
3178 error = PTR_ERR(root_mnt);
3179 if (IS_ERR(root_mnt))
3180 goto out;
3181
3182 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3183out:
3184 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3185 error != 0 ? " [error]" : "");
3186 return error;
3187}
3188
54ceac45 3189#endif /* CONFIG_NFS_V4 */
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