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NFS: include filelayout DS rpc stats in mountstats
[linux-2.6-block.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.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"
ae50c0b5 66#include "pnfs.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
69
1e657bd5
PZ		 70#ifdef CONFIG_NFS_V3
71#define NFS_DEFAULT_VERSION 3
72#else
73#define NFS_DEFAULT_VERSION 2
74#endif
75
bf0fd768
CL		 76enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
bf0fd768
CL		 79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
7ced286e 83 Opt_v2, Opt_v3, Opt_v4, Opt_v4_0, Opt_v4_1,
2cf7ff7a 84 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
75180df2 87 Opt_sharecache, Opt_nosharecache,
d740351b 88 Opt_resvport, Opt_noresvport,
b797cac7 89 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
e887cbcf 100 Opt_mountvers,
ad879cef 101 Opt_nfsvers,
3fd5be9e 102 Opt_minorversion,
bf0fd768
CL		 103
104 /* Mount options that take string arguments */
33832034 105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 107 Opt_lookupcache,
b797cac7 108 Opt_fscache_uniq,
5eebde23 109 Opt_local_lock,
bf0fd768 110
f45663ce
CL		 111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 113
114 Opt_err
115};
116
a447c093 117static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
ecbb3845
CL		 120 { Opt_userspace, "retry=%s" },
121
f45663ce
CL		 122 { Opt_sloppy, "sloppy" },
123
bf0fd768
CL		 124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
d33e4dfe
CL		 126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
bf0fd768
CL		 128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
764302cc 138 { Opt_v4, "v4" },
7ced286e
WAA		 139 { Opt_v4_0, "v4.0" },
140 { Opt_v4_1, "v4.1" },
bf0fd768
CL		 141 { Opt_udp, "udp" },
142 { Opt_tcp, "tcp" },
2cf7ff7a 143 { Opt_rdma, "rdma" },
bf0fd768
CL		 144 { Opt_acl, "acl" },
145 { Opt_noacl, "noacl" },
146 { Opt_rdirplus, "rdirplus" },
147 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 148 { Opt_sharecache, "sharecache" },
149 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 150 { Opt_resvport, "resvport" },
151 { Opt_noresvport, "noresvport" },
b797cac7 152 { Opt_fscache, "fsc" },
b797cac7 153 { Opt_nofscache, "nofsc" },
bf0fd768 154
a5a16bae
CL		 155 { Opt_port, "port=%s" },
156 { Opt_rsize, "rsize=%s" },
157 { Opt_wsize, "wsize=%s" },
158 { Opt_bsize, "bsize=%s" },
159 { Opt_timeo, "timeo=%s" },
160 { Opt_retrans, "retrans=%s" },
161 { Opt_acregmin, "acregmin=%s" },
162 { Opt_acregmax, "acregmax=%s" },
163 { Opt_acdirmin, "acdirmin=%s" },
164 { Opt_acdirmax, "acdirmax=%s" },
165 { Opt_actimeo, "actimeo=%s" },
166 { Opt_namelen, "namlen=%s" },
167 { Opt_mountport, "mountport=%s" },
168 { Opt_mountvers, "mountvers=%s" },
169 { Opt_nfsvers, "nfsvers=%s" },
170 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 171 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 172
173 { Opt_sec, "sec=%s" },
174 { Opt_proto, "proto=%s" },
175 { Opt_mountproto, "mountproto=%s" },
176 { Opt_addr, "addr=%s" },
177 { Opt_clientaddr, "clientaddr=%s" },
33832034 178 { Opt_mounthost, "mounthost=%s" },
0ac83779 179 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 180
7973c1f1 181 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 182 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 183 { Opt_local_lock, "local_lock=%s" },
7973c1f1 184
bf0fd768
CL		 185 { Opt_err, NULL }
186};
187
188enum {
ee671b01 189 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 190
191 Opt_xprt_err
192};
193
a447c093 194static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 195 { Opt_xprt_udp, "udp" },
ee671b01 196 { Opt_xprt_udp6, "udp6" },
bf0fd768 197 { Opt_xprt_tcp, "tcp" },
ee671b01 198 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 199 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 200
201 { Opt_xprt_err, NULL }
202};
203
204enum {
205 Opt_sec_none, Opt_sec_sys,
206 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
207 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
208 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
209
210 Opt_sec_err
211};
212
a447c093 213static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 214 { Opt_sec_none, "none" },
215 { Opt_sec_none, "null" },
216 { Opt_sec_sys, "sys" },
217
218 { Opt_sec_krb5, "krb5" },
219 { Opt_sec_krb5i, "krb5i" },
220 { Opt_sec_krb5p, "krb5p" },
221
222 { Opt_sec_lkey, "lkey" },
223 { Opt_sec_lkeyi, "lkeyi" },
224 { Opt_sec_lkeyp, "lkeyp" },
225
8d042218
OK		 226 { Opt_sec_spkm, "spkm3" },
227 { Opt_sec_spkmi, "spkm3i" },
228 { Opt_sec_spkmp, "spkm3p" },
229
bf0fd768
CL		 230 { Opt_sec_err, NULL }
231};
232
7973c1f1
TM		 233enum {
234 Opt_lookupcache_all, Opt_lookupcache_positive,
235 Opt_lookupcache_none,
236
237 Opt_lookupcache_err
238};
239
240static match_table_t nfs_lookupcache_tokens = {
241 { Opt_lookupcache_all, "all" },
242 { Opt_lookupcache_positive, "pos" },
243 { Opt_lookupcache_positive, "positive" },
244 { Opt_lookupcache_none, "none" },
245
246 { Opt_lookupcache_err, NULL }
247};
248
5eebde23
SJ		 249enum {
250 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
251 Opt_local_lock_none,
252
253 Opt_local_lock_err
254};
255
256static match_table_t nfs_local_lock_tokens = {
257 { Opt_local_lock_all, "all" },
258 { Opt_local_lock_flock, "flock" },
259 { Opt_local_lock_posix, "posix" },
260 { Opt_local_lock_none, "none" },
261
262 { Opt_local_lock_err, NULL }
263};
264
bf0fd768 265
42faad99 266static void nfs_umount_begin(struct super_block *);
816724e6 267static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 268static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 269static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 270static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 271static int nfs_show_stats(struct seq_file *, struct dentry *);
01194981
AV		 272static struct dentry *nfs_fs_mount(struct file_system_type *,
273 int, const char *, void *);
31f43471
AV		 274static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
275 int flags, const char *dev_name, void *raw_data);
387c149b 276static void nfs_put_super(struct super_block *);
f7b422b1 277static void nfs_kill_super(struct super_block *);
48b605f8 278static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 279
280static struct file_system_type nfs_fs_type = {
281 .owner = THIS_MODULE,
282 .name = "nfs",
01194981 283 .mount = nfs_fs_mount,
f7b422b1 284 .kill_sb = nfs_kill_super,
349457cc 285 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 286};
287
54ceac45 288struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 289 .owner = THIS_MODULE,
290 .name = "nfs",
31f43471 291 .mount = nfs_xdev_mount,
f7b422b1 292 .kill_sb = nfs_kill_super,
349457cc 293 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 294};
295
ee9b6d61 296static const struct super_operations nfs_sops = {
f7b422b1
DH		 297 .alloc_inode = nfs_alloc_inode,
298 .destroy_inode = nfs_destroy_inode,
299 .write_inode = nfs_write_inode,
387c149b 300 .put_super = nfs_put_super,
f7b422b1 301 .statfs = nfs_statfs,
b57922d9 302 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 303 .umount_begin = nfs_umount_begin,
304 .show_options = nfs_show_options,
c7f404b4
AV		 305 .show_devname = nfs_show_devname,
306 .show_path = nfs_show_path,
f7b422b1 307 .show_stats = nfs_show_stats,
48b605f8 308 .remount_fs = nfs_remount,
f7b422b1
DH		 309};
310
311#ifdef CONFIG_NFS_V4
7630c852
CL		 312static int nfs4_validate_text_mount_data(void *options,
313 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 314static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
315 struct nfs_parsed_mount_data *data);
316static struct dentry *nfs4_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 318static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
320static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
01194981
AV		 322static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 324static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
325 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 326static void nfs4_kill_super(struct super_block *sb);
327
328static struct file_system_type nfs4_fs_type = {
329 .owner = THIS_MODULE,
330 .name = "nfs4",
01194981 331 .mount = nfs4_mount,
f7b422b1 332 .kill_sb = nfs4_kill_super,
349457cc 333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 334};
335
c02d7adf
TM		 336static struct file_system_type nfs4_remote_fs_type = {
337 .owner = THIS_MODULE,
338 .name = "nfs4",
31f43471 339 .mount = nfs4_remote_mount,
c02d7adf
TM		 340 .kill_sb = nfs4_kill_super,
341 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
342};
343
54ceac45 344struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 345 .owner = THIS_MODULE,
346 .name = "nfs4",
31f43471 347 .mount = nfs4_xdev_mount,
f7b422b1 348 .kill_sb = nfs4_kill_super,
349457cc 349 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 350};
351
c02d7adf
TM		 352static struct file_system_type nfs4_remote_referral_fs_type = {
353 .owner = THIS_MODULE,
354 .name = "nfs4",
31f43471 355 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 356 .kill_sb = nfs4_kill_super,
357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
358};
359
54ceac45 360struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 361 .owner = THIS_MODULE,
362 .name = "nfs4",
01194981 363 .mount = nfs4_referral_mount,
f7b422b1 364 .kill_sb = nfs4_kill_super,
349457cc 365 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 366};
367
ee9b6d61 368static const struct super_operations nfs4_sops = {
f7b422b1
DH		 369 .alloc_inode = nfs_alloc_inode,
370 .destroy_inode = nfs_destroy_inode,
371 .write_inode = nfs_write_inode,
387c149b 372 .put_super = nfs_put_super,
f7b422b1 373 .statfs = nfs_statfs,
b57922d9 374 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 375 .umount_begin = nfs_umount_begin,
376 .show_options = nfs_show_options,
c7f404b4
AV		 377 .show_devname = nfs_show_devname,
378 .show_path = nfs_show_path,
f7b422b1 379 .show_stats = nfs_show_stats,
48b605f8 380 .remount_fs = nfs_remount,
f7b422b1
DH		 381};
382#endif
383
8e1f936b
RR		 384static struct shrinker acl_shrinker = {
385 .shrink = nfs_access_cache_shrinker,
386 .seeks = DEFAULT_SEEKS,
387};
979df72e 388
f7b422b1
DH		 389/*
390 * Register the NFS filesystems
391 */
392int __init register_nfs_fs(void)
393{
394 int ret;
395
396 ret = register_filesystem(&nfs_fs_type);
397 if (ret < 0)
398 goto error_0;
399
f7b422b1
DH		 400 ret = nfs_register_sysctl();
401 if (ret < 0)
402 goto error_1;
89a09141 403#ifdef CONFIG_NFS_V4
f7b422b1
DH		 404 ret = register_filesystem(&nfs4_fs_type);
405 if (ret < 0)
406 goto error_2;
407#endif
8e1f936b 408 register_shrinker(&acl_shrinker);
f7b422b1
DH		 409 return 0;
410
411#ifdef CONFIG_NFS_V4
412error_2:
413 nfs_unregister_sysctl();
89a09141 414#endif
f7b422b1
DH		 415error_1:
416 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 417error_0:
418 return ret;
419}
420
421/*
422 * Unregister the NFS filesystems
423 */
424void __exit unregister_nfs_fs(void)
425{
8e1f936b 426 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 427#ifdef CONFIG_NFS_V4
428 unregister_filesystem(&nfs4_fs_type);
f7b422b1 429#endif
49af7ee1 430 nfs_unregister_sysctl();
f7b422b1
DH		 431 unregister_filesystem(&nfs_fs_type);
432}
433
1daef0a8 434void nfs_sb_active(struct super_block *sb)
ef818a28 435{
1daef0a8 436 struct nfs_server *server = NFS_SB(sb);
ef818a28 437
1daef0a8
TM		 438 if (atomic_inc_return(&server->active) == 1)
439 atomic_inc(&sb->s_active);
ef818a28
SD		 440}
441
1daef0a8 442void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 443{
444 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 445
446 if (atomic_dec_and_test(&server->active))
447 deactivate_super(sb);
ef818a28
SD		 448}
449
f7b422b1
DH		 450/*
451 * Deliver file system statistics to userspace
452 */
816724e6 453static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 454{
0c7d90cf 455 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 456 unsigned char blockbits;
457 unsigned long blockres;
0c7d90cf 458 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 459 struct nfs_fsstat res;
460 int error = -ENOMEM;
461
462 res.fattr = nfs_alloc_fattr();
463 if (res.fattr == NULL)
464 goto out_err;
f7b422b1 465
8fa5c000 466 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 467 if (unlikely(error == -ESTALE)) {
468 struct dentry *pd_dentry;
469
470 pd_dentry = dget_parent(dentry);
471 if (pd_dentry != NULL) {
472 nfs_zap_caches(pd_dentry->d_inode);
473 dput(pd_dentry);
474 }
475 }
ca7e9a0d 476 nfs_free_fattr(res.fattr);
f7b422b1
DH		 477 if (error < 0)
478 goto out_err;
ca7e9a0d 479
1a0ba9ae 480 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 481
482 /*
483 * Current versions of glibc do not correctly handle the
484 * case where f_frsize != f_bsize. Eventually we want to
485 * report the value of wtmult in this field.
486 */
0c7d90cf 487 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 488
489 /*
490 * On most *nix systems, f_blocks, f_bfree, and f_bavail
491 * are reported in units of f_frsize. Linux hasn't had
492 * an f_frsize field in its statfs struct until recently,
493 * thus historically Linux's sys_statfs reports these
494 * fields in units of f_bsize.
495 */
0c7d90cf
DH		 496 buf->f_bsize = dentry->d_sb->s_blocksize;
497 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 498 blockres = (1 << blockbits) - 1;
499 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
500 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
501 buf->f_bavail = (res.abytes + blockres) >> blockbits;
502
503 buf->f_files = res.tfiles;
504 buf->f_ffree = res.afiles;
505
506 buf->f_namelen = server->namelen;
1a0ba9ae 507
f7b422b1
DH		 508 return 0;
509
510 out_err:
3110ff80 511 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 512 return error;
f7b422b1
DH		 513}
514
7d4e2747
DH		 515/*
516 * Map the security flavour number to a name
517 */
81039f1f
TM		 518static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
519{
7d4e2747 520 static const struct {
81039f1f
TM		 521 rpc_authflavor_t flavour;
522 const char *str;
523 } sec_flavours[] = {
524 { RPC_AUTH_NULL, "null" },
525 { RPC_AUTH_UNIX, "sys" },
526 { RPC_AUTH_GSS_KRB5, "krb5" },
527 { RPC_AUTH_GSS_KRB5I, "krb5i" },
528 { RPC_AUTH_GSS_KRB5P, "krb5p" },
529 { RPC_AUTH_GSS_LKEY, "lkey" },
530 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
531 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
532 { RPC_AUTH_GSS_SPKM, "spkm" },
533 { RPC_AUTH_GSS_SPKMI, "spkmi" },
534 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 535 { UINT_MAX, "unknown" }
81039f1f
TM		 536 };
537 int i;
538
4d81cd16 539 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 540 if (sec_flavours[i].flavour == flavour)
541 break;
542 }
543 return sec_flavours[i].str;
544}
545
ee671b01
JL		 546static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
547 int showdefaults)
548{
549 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
550
551 seq_printf(m, ",mountproto=");
552 switch (sap->sa_family) {
553 case AF_INET:
554 switch (nfss->mountd_protocol) {
555 case IPPROTO_UDP:
556 seq_printf(m, RPCBIND_NETID_UDP);
557 break;
558 case IPPROTO_TCP:
559 seq_printf(m, RPCBIND_NETID_TCP);
560 break;
561 default:
562 if (showdefaults)
563 seq_printf(m, "auto");
564 }
565 break;
566 case AF_INET6:
567 switch (nfss->mountd_protocol) {
568 case IPPROTO_UDP:
569 seq_printf(m, RPCBIND_NETID_UDP6);
570 break;
571 case IPPROTO_TCP:
572 seq_printf(m, RPCBIND_NETID_TCP6);
573 break;
574 default:
575 if (showdefaults)
576 seq_printf(m, "auto");
577 }
578 break;
579 default:
580 if (showdefaults)
581 seq_printf(m, "auto");
582 }
583}
584
82d101d5
CL		 585static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
586 int showdefaults)
587{
588 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
589
d5eff1a3
BS		 590 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
591 return;
592
82d101d5
CL		 593 switch (sap->sa_family) {
594 case AF_INET: {
595 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 596 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 597 break;
598 }
599 case AF_INET6: {
600 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 601 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 602 break;
603 }
604 default:
605 if (showdefaults)
606 seq_printf(m, ",mountaddr=unspecified");
607 }
608
609 if (nfss->mountd_version || showdefaults)
610 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 611 if ((nfss->mountd_port &&
612 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
613 showdefaults)
82d101d5
CL		 614 seq_printf(m, ",mountport=%u", nfss->mountd_port);
615
ee671b01 616 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 617}
618
0be8189f
TM		 619#ifdef CONFIG_NFS_V4
620static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
621 int showdefaults)
622{
623 struct nfs_client *clp = nfss->nfs_client;
624
625 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
626 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
627}
628#else
629static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
630 int showdefaults)
631{
632}
633#endif
634
f7b422b1
DH		 635/*
636 * Describe the mount options in force on this server representation
637 */
82d101d5
CL		 638static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
639 int showdefaults)
f7b422b1 640{
509de811 641 static const struct proc_nfs_info {
f7b422b1 642 int flag;
509de811
DH		 643 const char *str;
644 const char *nostr;
f7b422b1
DH		 645 } nfs_info[] = {
646 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 647 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 648 { NFS_MOUNT_NOCTO, ",nocto", "" },
649 { NFS_MOUNT_NOAC, ",noac", "" },
650 { NFS_MOUNT_NONLM, ",nolock", "" },
651 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 652 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 653 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
654 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 655 { 0, NULL, NULL }
656 };
509de811 657 const struct proc_nfs_info *nfs_infop;
8fa5c000 658 struct nfs_client *clp = nfss->nfs_client;
82d101d5 659 u32 version = clp->rpc_ops->version;
7c563cc9 660 int local_flock, local_fcntl;
f7b422b1 661
82d101d5 662 seq_printf(m, ",vers=%u", version);
2d767432
CL		 663 seq_printf(m, ",rsize=%u", nfss->rsize);
664 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 665 if (nfss->bsize != 0)
666 seq_printf(m, ",bsize=%u", nfss->bsize);
667 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 668 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 669 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 670 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 671 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 672 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 673 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 674 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 675 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 676 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
677 if (nfss->flags & nfs_infop->flag)
678 seq_puts(m, nfs_infop->str);
679 else
680 seq_puts(m, nfs_infop->nostr);
681 }
56928edd 682 seq_printf(m, ",proto=%s",
ee671b01 683 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 684 if (version == 4) {
685 if (nfss->port != NFS_PORT)
686 seq_printf(m, ",port=%u", nfss->port);
687 } else
688 if (nfss->port)
689 seq_printf(m, ",port=%u", nfss->port);
690
33170233
TM		 691 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
692 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 693 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 694
695 if (version != 4)
696 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 697 else
698 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 699
b797cac7
DH		 700 if (nfss->options & NFS_OPTION_FSCACHE)
701 seq_printf(m, ",fsc");
9b00c643
PL		 702
703 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
704 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
705 seq_printf(m, ",lookupcache=none");
706 else
707 seq_printf(m, ",lookupcache=pos");
708 }
7c563cc9
SJ		 709
710 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
711 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
712
713 if (!local_flock && !local_fcntl)
714 seq_printf(m, ",local_lock=none");
715 else if (local_flock && local_fcntl)
716 seq_printf(m, ",local_lock=all");
717 else if (local_flock)
718 seq_printf(m, ",local_lock=flock");
719 else
720 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 721}
722
723/*
724 * Describe the mount options on this VFS mountpoint
725 */
34c80b1d 726static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 727{
34c80b1d 728 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 729
730 nfs_show_mount_options(m, nfss, 0);
731
5d8515ca
CL		 732 seq_printf(m, ",addr=%s",
733 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
734 RPC_DISPLAY_ADDR));
f7b422b1
DH		 735
736 return 0;
737}
45402c38
HS		 738
739#ifdef CONFIG_NFS_V4
ae50c0b5 740#ifdef CONFIG_NFS_V4_1
45402c38 741static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 742{
743 if (nfs4_has_session(server->nfs_client))
744 seq_printf(m, ",sessions");
745}
746#else
45402c38
HS		 747static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
748#endif
ae50c0b5
BF		 749#endif
750
45402c38 751#ifdef CONFIG_NFS_V4
ae50c0b5 752#ifdef CONFIG_NFS_V4_1
45402c38 753static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 754{
755 seq_printf(m, ",pnfs=");
756 if (server->pnfs_curr_ld)
757 seq_printf(m, "%s", server->pnfs_curr_ld->name);
758 else
759 seq_printf(m, "not configured");
760}
45402c38
HS		 761#else
762static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
763#endif
764#endif
f7b422b1 765
d861c630 766static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 767{
768 char *page = (char *) __get_free_page(GFP_KERNEL);
769 char *devname, *dummy;
770 int err = 0;
771 if (!page)
772 return -ENOMEM;
d861c630 773 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 774 if (IS_ERR(devname))
775 err = PTR_ERR(devname);
776 else
777 seq_escape(m, devname, " \t\n\\");
778 free_page((unsigned long)page);
779 return err;
780}
781
a6322de6 782static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 783{
784 seq_puts(m, "/");
785 return 0;
786}
787
f7b422b1
DH		 788/*
789 * Present statistical information for this VFS mountpoint
790 */
64132379 791static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 792{
793 int i, cpu;
64132379 794 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 795 struct rpc_auth *auth = nfss->client->cl_auth;
796 struct nfs_iostats totals = { };
797
798 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
799
800 /*
801 * Display all mount option settings
802 */
803 seq_printf(m, "\n\topts:\t");
64132379
AV		 804 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
805 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
806 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
807 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 808 nfs_show_mount_options(m, nfss, 1);
809
810 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
811
812 seq_printf(m, "\n\tcaps:\t");
813 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 814 seq_printf(m, ",wtmult=%u", nfss->wtmult);
815 seq_printf(m, ",dtsize=%u", nfss->dtsize);
816 seq_printf(m, ",bsize=%u", nfss->bsize);
817 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 818
819#ifdef CONFIG_NFS_V4
40c55319 820 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 821 seq_printf(m, "\n\tnfsv4:\t");
822 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
823 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
824 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 825 show_sessions(m, nfss);
826 show_pnfs(m, nfss);
f7b422b1
DH		 827 }
828#endif
829
830 /*
831 * Display security flavor in effect for this mount
832 */
2d767432 833 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 834 if (auth->au_flavor)
2d767432 835 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 836
837 /*
838 * Display superblock I/O counters
839 */
840 for_each_possible_cpu(cpu) {
841 struct nfs_iostats *stats;
842
843 preempt_disable();
844 stats = per_cpu_ptr(nfss->io_stats, cpu);
845
846 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
847 totals.events[i] += stats->events[i];
848 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
849 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 850#ifdef CONFIG_NFS_FSCACHE
851 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
852 totals.fscache[i] += stats->fscache[i];
853#endif
f7b422b1
DH		 854
855 preempt_enable();
856 }
857
858 seq_printf(m, "\n\tevents:\t");
859 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
860 seq_printf(m, "%lu ", totals.events[i]);
861 seq_printf(m, "\n\tbytes:\t");
862 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
863 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 864#ifdef CONFIG_NFS_FSCACHE
865 if (nfss->options & NFS_OPTION_FSCACHE) {
866 seq_printf(m, "\n\tfsc:\t");
867 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
868 seq_printf(m, "%Lu ", totals.bytes[i]);
869 }
870#endif
f7b422b1
DH		 871 seq_printf(m, "\n");
872
873 rpc_print_iostats(m, nfss->client);
874
875 return 0;
876}
877
878/*
879 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 880 * in response to xdev traversals and referrals
f7b422b1 881 */
42faad99 882static void nfs_umount_begin(struct super_block *sb)
f7b422b1 883{
67e55205 884 struct nfs_server *server;
fc6ae3cf
TM		 885 struct rpc_clnt *rpc;
886
67e55205 887 server = NFS_SB(sb);
fc6ae3cf
TM		 888 /* -EIO all pending I/O */
889 rpc = server->client_acl;
890 if (!IS_ERR(rpc))
891 rpc_killall_tasks(rpc);
892 rpc = server->client;
893 if (!IS_ERR(rpc))
894 rpc_killall_tasks(rpc);
f7b422b1
DH		 895}
896
c5811dbd 897static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 898{
899 struct nfs_parsed_mount_data *data;
900
901 data = kzalloc(sizeof(*data), GFP_KERNEL);
902 if (data) {
9423a08a
CL		 903 data->acregmin = NFS_DEF_ACREGMIN;
904 data->acregmax = NFS_DEF_ACREGMAX;
905 data->acdirmin = NFS_DEF_ACDIRMIN;
906 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 907 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 908 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 909 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 910 data->auth_flavors[0] = RPC_AUTH_UNIX;
911 data->auth_flavor_len = 1;
c5811dbd 912 data->version = version;
9423a08a 913 data->minorversion = 0;
8a0d551a 914 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 915 }
916 return data;
917}
918
8a0d551a
JL		 919static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
920{
921 if (data) {
922 kfree(data->client_address);
923 kfree(data->mount_server.hostname);
924 kfree(data->nfs_server.export_path);
925 kfree(data->nfs_server.hostname);
926 kfree(data->fscache_uniq);
927 security_free_mnt_opts(&data->lsm_opts);
928 kfree(data);
929 }
930}
931
fc50d58f 932/*
cdcd7f9a
CL		 933 * Sanity-check a server address provided by the mount command.
934 *
935 * Address family must be initialized, and address must not be
936 * the ANY address for that family.
fc50d58f
CL		 937 */
938static int nfs_verify_server_address(struct sockaddr *addr)
939{
940 switch (addr->sa_family) {
941 case AF_INET: {
cdcd7f9a 942 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 943 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 944 }
945 case AF_INET6: {
946 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
947 return !ipv6_addr_any(sa);
fc50d58f
CL		 948 }
949 }
950
53a0b9c4 951 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 952 return 0;
953}
954
4cfd74fc
CL		 955/*
956 * Select between a default port value and a user-specified port value.
957 * If a zero value is set, then autobind will be used.
958 */
f5855fec 959static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 960 const unsigned short default_port)
961{
f5855fec
TM		 962 if (*port == NFS_UNSPEC_PORT)
963 *port = default_port;
4cfd74fc 964
f5855fec 965 rpc_set_port(sap, *port);
4cfd74fc
CL		 966}
967
259875ef
TM		 968/*
969 * Sanity check the NFS transport protocol.
970 *
971 */
972static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
973{
974 switch (mnt->nfs_server.protocol) {
975 case XPRT_TRANSPORT_UDP:
976 case XPRT_TRANSPORT_TCP:
977 case XPRT_TRANSPORT_RDMA:
978 break;
979 default:
980 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
981 }
982}
983
984/*
985 * For text based NFSv2/v3 mounts, the mount protocol transport default
986 * settings should depend upon the specified NFS transport.
987 */
988static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
989{
990 nfs_validate_transport_protocol(mnt);
991
992 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
993 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
994 return;
995 switch (mnt->nfs_server.protocol) {
996 case XPRT_TRANSPORT_UDP:
997 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
998 break;
999 case XPRT_TRANSPORT_TCP:
1000 case XPRT_TRANSPORT_RDMA:
1001 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1002 }
1003}
1004
01060c89
CL		 1005/*
1006 * Parse the value of the 'sec=' option.
01060c89
CL		 1007 */
1008static int nfs_parse_security_flavors(char *value,
1009 struct nfs_parsed_mount_data *mnt)
1010{
1011 substring_t args[MAX_OPT_ARGS];
1012
1013 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1014
1015 switch (match_token(value, nfs_secflavor_tokens, args)) {
1016 case Opt_sec_none:
01060c89
CL		 1017 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1018 break;
1019 case Opt_sec_sys:
01060c89
CL		 1020 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1021 break;
1022 case Opt_sec_krb5:
01060c89
CL		 1023 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1024 break;
1025 case Opt_sec_krb5i:
01060c89
CL		 1026 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1027 break;
1028 case Opt_sec_krb5p:
01060c89
CL		 1029 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1030 break;
1031 case Opt_sec_lkey:
01060c89
CL		 1032 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1033 break;
1034 case Opt_sec_lkeyi:
01060c89
CL		 1035 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1036 break;
1037 case Opt_sec_lkeyp:
01060c89
CL		 1038 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1039 break;
1040 case Opt_sec_spkm:
01060c89
CL		 1041 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1042 break;
1043 case Opt_sec_spkmi:
01060c89
CL		 1044 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1045 break;
1046 case Opt_sec_spkmp:
01060c89
CL		 1047 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1048 break;
1049 default:
1050 return 0;
1051 }
1052
9b7160c5 1053 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1054 mnt->auth_flavor_len = 1;
01060c89
CL		 1055 return 1;
1056}
1057
c5cb09b6
RL		 1058static int nfs_get_option_str(substring_t args[], char **option)
1059{
1060 kfree(*option);
1061 *option = match_strdup(args);
1062 return !option;
1063}
1064
1065static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1066{
1067 int rc;
1068 char *string;
1069
1070 string = match_strdup(args);
1071 if (string == NULL)
1072 return -ENOMEM;
1073 rc = strict_strtoul(string, 10, option);
1074 kfree(string);
1075
1076 return rc;
1077}
1078
bf0fd768
CL		 1079/*
1080 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1081 * a data structure. The whole mount string is processed; bad options are
1082 * skipped as they are encountered. If there were no errors, return 1;
1083 * otherwise return 0 (zero).
bf0fd768
CL		 1084 */
1085static int nfs_parse_mount_options(char *raw,
1086 struct nfs_parsed_mount_data *mnt)
1087{
f9c3a380 1088 char *p, *string, *secdata;
d23c45fd 1089 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1090 unsigned short protofamily = AF_UNSPEC;
1091 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1092
1093 if (!raw) {
1094 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1095 return 1;
1096 }
1097 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1098
f9c3a380
EP		 1099 secdata = alloc_secdata();
1100 if (!secdata)
1101 goto out_nomem;
1102
1103 rc = security_sb_copy_data(raw, secdata);
1104 if (rc)
1105 goto out_security_failure;
1106
1107 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1108 if (rc)
1109 goto out_security_failure;
1110
1111 free_secdata(secdata);
1112
e50a7a1a
SK		 1113 mnt->net = current->nsproxy->net_ns;
1114
bf0fd768
CL		 1115 while ((p = strsep(&raw, ",")) != NULL) {
1116 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1117 unsigned long option;
1118 int token;
bf0fd768
CL		 1119
1120 if (!*p)
1121 continue;
1122
1123 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1124
1125 token = match_token(p, nfs_mount_option_tokens, args);
1126 switch (token) {
f45663ce
CL		 1127
1128 /*
1129 * boolean options: foo/nofoo
1130 */
bf0fd768
CL		 1131 case Opt_soft:
1132 mnt->flags |= NFS_MOUNT_SOFT;
1133 break;
1134 case Opt_hard:
1135 mnt->flags &= ~NFS_MOUNT_SOFT;
1136 break;
bf0fd768
CL		 1137 case Opt_posix:
1138 mnt->flags |= NFS_MOUNT_POSIX;
1139 break;
1140 case Opt_noposix:
1141 mnt->flags &= ~NFS_MOUNT_POSIX;
1142 break;
1143 case Opt_cto:
1144 mnt->flags &= ~NFS_MOUNT_NOCTO;
1145 break;
1146 case Opt_nocto:
1147 mnt->flags |= NFS_MOUNT_NOCTO;
1148 break;
1149 case Opt_ac:
1150 mnt->flags &= ~NFS_MOUNT_NOAC;
1151 break;
1152 case Opt_noac:
1153 mnt->flags |= NFS_MOUNT_NOAC;
1154 break;
1155 case Opt_lock:
1156 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1157 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1158 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1159 break;
1160 case Opt_nolock:
1161 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1162 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1163 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1164 break;
1165 case Opt_v2:
1166 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1167 mnt->version = 2;
bf0fd768
CL		 1168 break;
1169 case Opt_v3:
1170 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1171 mnt->version = 3;
bf0fd768 1172 break;
764302cc
CL		 1173 case Opt_v4:
1174 mnt->flags &= ~NFS_MOUNT_VER3;
1175 mnt->version = 4;
1176 break;
7ced286e
WAA		 1177 case Opt_v4_0:
1178 mnt->flags &= ~NFS_MOUNT_VER3;
1179 mnt->version = 4;
1180 mnt->minorversion = 0;
1181 break;
1182 case Opt_v4_1:
1183 mnt->flags &= ~NFS_MOUNT_VER3;
1184 mnt->version = 4;
1185 mnt->minorversion = 1;
1186 break;
bf0fd768
CL		 1187 case Opt_udp:
1188 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1189 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1190 break;
1191 case Opt_tcp:
1192 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1193 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1194 break;
2cf7ff7a
TT		 1195 case Opt_rdma:
1196 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1197 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1198 xprt_load_transport(p);
2cf7ff7a 1199 break;
bf0fd768
CL		 1200 case Opt_acl:
1201 mnt->flags &= ~NFS_MOUNT_NOACL;
1202 break;
1203 case Opt_noacl:
1204 mnt->flags |= NFS_MOUNT_NOACL;
1205 break;
1206 case Opt_rdirplus:
1207 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1208 break;
1209 case Opt_nordirplus:
1210 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1211 break;
75180df2
TM		 1212 case Opt_sharecache:
1213 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1214 break;
1215 case Opt_nosharecache:
1216 mnt->flags |= NFS_MOUNT_UNSHARED;
1217 break;
d740351b
CL		 1218 case Opt_resvport:
1219 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1220 break;
1221 case Opt_noresvport:
1222 mnt->flags |= NFS_MOUNT_NORESVPORT;
1223 break;
b797cac7
DH		 1224 case Opt_fscache:
1225 mnt->options |= NFS_OPTION_FSCACHE;
1226 kfree(mnt->fscache_uniq);
1227 mnt->fscache_uniq = NULL;
1228 break;
1229 case Opt_nofscache:
1230 mnt->options &= ~NFS_OPTION_FSCACHE;
1231 kfree(mnt->fscache_uniq);
1232 mnt->fscache_uniq = NULL;
1233 break;
bf0fd768 1234
f45663ce
CL		 1235 /*
1236 * options that take numeric values
1237 */
bf0fd768 1238 case Opt_port:
c5cb09b6
RL		 1239 if (nfs_get_option_ul(args, &option) ||
1240 option > USHRT_MAX)
d23c45fd
CL		 1241 goto out_invalid_value;
1242 mnt->nfs_server.port = option;
bf0fd768
CL		 1243 break;
1244 case Opt_rsize:
c5cb09b6 1245 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1246 goto out_invalid_value;
1247 mnt->rsize = option;
bf0fd768
CL		 1248 break;
1249 case Opt_wsize:
c5cb09b6 1250 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1251 goto out_invalid_value;
1252 mnt->wsize = option;
bf0fd768
CL		 1253 break;
1254 case Opt_bsize:
c5cb09b6 1255 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1256 goto out_invalid_value;
1257 mnt->bsize = option;
bf0fd768
CL		 1258 break;
1259 case Opt_timeo:
c5cb09b6 1260 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1261 goto out_invalid_value;
1262 mnt->timeo = option;
bf0fd768
CL		 1263 break;
1264 case Opt_retrans:
c5cb09b6 1265 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1266 goto out_invalid_value;
1267 mnt->retrans = option;
bf0fd768
CL		 1268 break;
1269 case Opt_acregmin:
c5cb09b6 1270 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1271 goto out_invalid_value;
1272 mnt->acregmin = option;
bf0fd768
CL		 1273 break;
1274 case Opt_acregmax:
c5cb09b6 1275 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1276 goto out_invalid_value;
1277 mnt->acregmax = option;
bf0fd768
CL		 1278 break;
1279 case Opt_acdirmin:
c5cb09b6 1280 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1281 goto out_invalid_value;
1282 mnt->acdirmin = option;
bf0fd768
CL		 1283 break;
1284 case Opt_acdirmax:
c5cb09b6 1285 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1286 goto out_invalid_value;
1287 mnt->acdirmax = option;
bf0fd768
CL		 1288 break;
1289 case Opt_actimeo:
c5cb09b6 1290 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1291 goto out_invalid_value;
1292 mnt->acregmin = mnt->acregmax =
1293 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1294 break;
1295 case Opt_namelen:
c5cb09b6 1296 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1297 goto out_invalid_value;
1298 mnt->namlen = option;
bf0fd768
CL		 1299 break;
1300 case Opt_mountport:
c5cb09b6
RL		 1301 if (nfs_get_option_ul(args, &option) ||
1302 option > USHRT_MAX)
d23c45fd
CL		 1303 goto out_invalid_value;
1304 mnt->mount_server.port = option;
bf0fd768 1305 break;
bf0fd768 1306 case Opt_mountvers:
c5cb09b6 1307 if (nfs_get_option_ul(args, &option) ||
f45663ce 1308 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1309 option > NFS_MNT3_VERSION)
1310 goto out_invalid_value;
1311 mnt->mount_server.version = option;
bf0fd768 1312 break;
bf0fd768 1313 case Opt_nfsvers:
c5cb09b6 1314 if (nfs_get_option_ul(args, &option))
d23c45fd 1315 goto out_invalid_value;
bf0fd768 1316 switch (option) {
f45663ce 1317 case NFS2_VERSION:
bf0fd768 1318 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1319 mnt->version = 2;
bf0fd768 1320 break;
f45663ce 1321 case NFS3_VERSION:
bf0fd768 1322 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1323 mnt->version = 3;
1324 break;
764302cc
CL		 1325 case NFS4_VERSION:
1326 mnt->flags &= ~NFS_MOUNT_VER3;
1327 mnt->version = 4;
bf0fd768
CL		 1328 break;
1329 default:
d23c45fd 1330 goto out_invalid_value;
bf0fd768
CL		 1331 }
1332 break;
3fd5be9e 1333 case Opt_minorversion:
c5cb09b6 1334 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1335 goto out_invalid_value;
1336 if (option > NFS4_MAX_MINOR_VERSION)
1337 goto out_invalid_value;
1338 mnt->minorversion = option;
3fd5be9e 1339 break;
bf0fd768 1340
f45663ce
CL		 1341 /*
1342 * options that take text values
1343 */
bf0fd768
CL		 1344 case Opt_sec:
1345 string = match_strdup(args);
1346 if (string == NULL)
1347 goto out_nomem;
01060c89 1348 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1349 kfree(string);
f45663ce 1350 if (!rc) {
f45663ce
CL		 1351 dfprintk(MOUNT, "NFS: unrecognized "
1352 "security flavor\n");
d23c45fd 1353 return 0;
f45663ce 1354 }
bf0fd768
CL		 1355 break;
1356 case Opt_proto:
1357 string = match_strdup(args);
1358 if (string == NULL)
1359 goto out_nomem;
1360 token = match_token(string,
1361 nfs_xprt_protocol_tokens, args);
bf0fd768 1362
ee671b01 1363 protofamily = AF_INET;
bf0fd768 1364 switch (token) {
ee671b01
JL		 1365 case Opt_xprt_udp6:
1366 protofamily = AF_INET6;
fdb66ff4 1367 case Opt_xprt_udp:
bf0fd768 1368 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1369 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1370 break;
ee671b01
JL		 1371 case Opt_xprt_tcp6:
1372 protofamily = AF_INET6;
fdb66ff4 1373 case Opt_xprt_tcp:
bf0fd768 1374 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1375 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1376 break;
2cf7ff7a
TT		 1377 case Opt_xprt_rdma:
1378 /* vector side protocols to TCP */
1379 mnt->flags |= NFS_MOUNT_TCP;
1380 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1381 xprt_load_transport(string);
2cf7ff7a 1382 break;
bf0fd768 1383 default:
f45663ce
CL		 1384 dfprintk(MOUNT, "NFS: unrecognized "
1385 "transport protocol\n");
4223a4a1 1386 kfree(string);
d23c45fd 1387 return 0;
bf0fd768 1388 }
c5cb09b6 1389 kfree(string);
bf0fd768
CL		 1390 break;
1391 case Opt_mountproto:
1392 string = match_strdup(args);
1393 if (string == NULL)
1394 goto out_nomem;
1395 token = match_token(string,
1396 nfs_xprt_protocol_tokens, args);
d508afb4 1397 kfree(string);
bf0fd768 1398
ee671b01 1399 mountfamily = AF_INET;
bf0fd768 1400 switch (token) {
ee671b01
JL		 1401 case Opt_xprt_udp6:
1402 mountfamily = AF_INET6;
fdb66ff4 1403 case Opt_xprt_udp:
0896a725 1404 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1405 break;
ee671b01
JL		 1406 case Opt_xprt_tcp6:
1407 mountfamily = AF_INET6;
fdb66ff4 1408 case Opt_xprt_tcp:
0896a725 1409 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1410 break;
2cf7ff7a 1411 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1412 default:
f45663ce
CL		 1413 dfprintk(MOUNT, "NFS: unrecognized "
1414 "transport protocol\n");
d23c45fd 1415 return 0;
bf0fd768
CL		 1416 }
1417 break;
1418 case Opt_addr:
1419 string = match_strdup(args);
1420 if (string == NULL)
1421 goto out_nomem;
53a0b9c4 1422 mnt->nfs_server.addrlen =
b48e1278 1423 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1424 (struct sockaddr *)
1425 &mnt->nfs_server.address,
1426 sizeof(mnt->nfs_server.address));
bf0fd768 1427 kfree(string);
53a0b9c4
CL		 1428 if (mnt->nfs_server.addrlen == 0)
1429 goto out_invalid_address;
bf0fd768
CL		 1430 break;
1431 case Opt_clientaddr:
c5cb09b6 1432 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1433 goto out_nomem;
bf0fd768 1434 break;
33832034 1435 case Opt_mounthost:
c5cb09b6
RL		 1436 if (nfs_get_option_str(args,
1437 &mnt->mount_server.hostname))
33832034 1438 goto out_nomem;
33832034 1439 break;
0ac83779 1440 case Opt_mountaddr:
bf0fd768
CL		 1441 string = match_strdup(args);
1442 if (string == NULL)
1443 goto out_nomem;
53a0b9c4 1444 mnt->mount_server.addrlen =
b48e1278 1445 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1446 (struct sockaddr *)
1447 &mnt->mount_server.address,
1448 sizeof(mnt->mount_server.address));
bf0fd768 1449 kfree(string);
53a0b9c4
CL		 1450 if (mnt->mount_server.addrlen == 0)
1451 goto out_invalid_address;
bf0fd768 1452 break;
7973c1f1
TM		 1453 case Opt_lookupcache:
1454 string = match_strdup(args);
1455 if (string == NULL)
1456 goto out_nomem;
1457 token = match_token(string,
1458 nfs_lookupcache_tokens, args);
1459 kfree(string);
1460 switch (token) {
1461 case Opt_lookupcache_all:
1462 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1463 break;
1464 case Opt_lookupcache_positive:
1465 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1466 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1467 break;
1468 case Opt_lookupcache_none:
1469 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1470 break;
1471 default:
7973c1f1
TM		 1472 dfprintk(MOUNT, "NFS: invalid "
1473 "lookupcache argument\n");
d23c45fd 1474 return 0;
7973c1f1
TM		 1475 };
1476 break;
a6d5ff64 1477 case Opt_fscache_uniq:
c5cb09b6 1478 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1479 goto out_nomem;
a6d5ff64
CL		 1480 mnt->options |= NFS_OPTION_FSCACHE;
1481 break;
5eebde23
SJ		 1482 case Opt_local_lock:
1483 string = match_strdup(args);
1484 if (string == NULL)
1485 goto out_nomem;
1486 token = match_token(string, nfs_local_lock_tokens,
1487 args);
1488 kfree(string);
1489 switch (token) {
1490 case Opt_local_lock_all:
1491 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1492 NFS_MOUNT_LOCAL_FCNTL);
1493 break;
1494 case Opt_local_lock_flock:
1495 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1496 break;
1497 case Opt_local_lock_posix:
1498 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1499 break;
1500 case Opt_local_lock_none:
1501 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1502 NFS_MOUNT_LOCAL_FCNTL);
1503 break;
1504 default:
1505 dfprintk(MOUNT, "NFS: invalid "
1506 "local_lock argument\n");
1507 return 0;
1508 };
1509 break;
bf0fd768 1510
f45663ce
CL		 1511 /*
1512 * Special options
1513 */
1514 case Opt_sloppy:
1515 sloppy = 1;
1516 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1517 break;
bf0fd768
CL		 1518 case Opt_userspace:
1519 case Opt_deprecated:
d33e4dfe
CL		 1520 dfprintk(MOUNT, "NFS: ignoring mount option "
1521 "'%s'\n", p);
bf0fd768
CL		 1522 break;
1523
1524 default:
d23c45fd 1525 invalid_option = 1;
f45663ce
CL		 1526 dfprintk(MOUNT, "NFS: unrecognized mount option "
1527 "'%s'\n", p);
bf0fd768
CL		 1528 }
1529 }
1530
d23c45fd
CL		 1531 if (!sloppy && invalid_option)
1532 return 0;
1533
571b7554
WAA		 1534 if (mnt->minorversion && mnt->version != 4)
1535 goto out_minorversion_mismatch;
1536
ee671b01
JL		 1537 /*
1538 * verify that any proto=/mountproto= options match the address
1539 * familiies in the addr=/mountaddr= options.
1540 */
1541 if (protofamily != AF_UNSPEC &&
1542 protofamily != mnt->nfs_server.address.ss_family)
1543 goto out_proto_mismatch;
1544
1545 if (mountfamily != AF_UNSPEC) {
1546 if (mnt->mount_server.addrlen) {
1547 if (mountfamily != mnt->mount_server.address.ss_family)
1548 goto out_mountproto_mismatch;
1549 } else {
1550 if (mountfamily != mnt->nfs_server.address.ss_family)
1551 goto out_mountproto_mismatch;
1552 }
1553 }
1554
bf0fd768
CL		 1555 return 1;
1556
ee671b01
JL		 1557out_mountproto_mismatch:
1558 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1559 "option\n");
1560 return 0;
1561out_proto_mismatch:
1562 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1563 return 0;
53a0b9c4
CL		 1564out_invalid_address:
1565 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1566 return 0;
d23c45fd 1567out_invalid_value:
53a0b9c4 1568 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1569 return 0;
571b7554
WAA		 1570out_minorversion_mismatch:
1571 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1572 "minorversion=%u\n", mnt->version, mnt->minorversion);
1573 return 0;
bf0fd768
CL		 1574out_nomem:
1575 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1576 return 0;
f9c3a380
EP		 1577out_security_failure:
1578 free_secdata(secdata);
1579 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1580 return 0;
bf0fd768
CL		 1581}
1582
ec88f28d
CL		 1583/*
1584 * Match the requested auth flavors with the list returned by
1585 * the server. Returns zero and sets the mount's authentication
1586 * flavor on success; returns -EACCES if server does not support
1587 * the requested flavor.
1588 */
1589static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1590 struct nfs_mount_request *request)
1591{
1592 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1593
5eecfde6
CL		 1594 /*
1595 * Certain releases of Linux's mountd return an empty
1596 * flavor list. To prevent behavioral regression with
1597 * these servers (ie. rejecting mounts that used to
1598 * succeed), revert to pre-2.6.32 behavior (no checking)
1599 * if the returned flavor list is empty.
1600 */
1601 if (server_authlist_len == 0)
1602 return 0;
1603
ec88f28d
CL		 1604 /*
1605 * We avoid sophisticated negotiating here, as there are
1606 * plenty of cases where we can get it wrong, providing
1607 * either too little or too much security.
1608 *
1609 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1610 * flavor listed first. However, some servers list
1611 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1612 * preferred default, in args->auth_flavors[0] if user
1613 * didn't specify sec= mount option.
1614 */
1615 for (i = 0; i < args->auth_flavor_len; i++)
1616 for (j = 0; j < server_authlist_len; j++)
1617 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1618 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1619 request->auth_flavs[j]);
1620 args->auth_flavors[0] = request->auth_flavs[j];
1621 return 0;
1622 }
1623
1624 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1625 nfs_umount(request);
1626 return -EACCES;
1627}
1628
0076d7b7
CL		 1629/*
1630 * Use the remote server's MOUNT service to request the NFS file handle
1631 * corresponding to the provided path.
1632 */
1633static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1634 struct nfs_fh *root_fh)
1635{
ec88f28d
CL		 1636 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1637 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1638 struct nfs_mount_request request = {
1639 .sap = (struct sockaddr *)
1640 &args->mount_server.address,
1641 .dirpath = args->nfs_server.export_path,
1642 .protocol = args->mount_server.protocol,
1643 .fh = root_fh,
50a737f8 1644 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1645 .auth_flav_len = &server_authlist_len,
1646 .auth_flavs = server_authlist,
6d59b8d5 1647 .net = args->net,
c5d120f8 1648 };
4c568017 1649 int status;
0076d7b7
CL		 1650
1651 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1652 switch (args->version) {
1653 default:
1654 args->mount_server.version = NFS_MNT3_VERSION;
1655 break;
1656 case 2:
1657 args->mount_server.version = NFS_MNT_VERSION;
1658 }
0076d7b7 1659 }
c5d120f8 1660 request.version = args->mount_server.version;
0076d7b7 1661
33832034 1662 if (args->mount_server.hostname)
c5d120f8 1663 request.hostname = args->mount_server.hostname;
33832034 1664 else
c5d120f8 1665 request.hostname = args->nfs_server.hostname;
33832034 1666
0076d7b7
CL		 1667 /*
1668 * Construct the mount server's address.
1669 */
4c568017 1670 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1671 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1672 args->nfs_server.addrlen);
1673 args->mount_server.addrlen = args->nfs_server.addrlen;
1674 }
c5d120f8 1675 request.salen = args->mount_server.addrlen;
f5855fec 1676 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1677
1678 /*
1679 * Now ask the mount server to map our export path
1680 * to a file handle.
1681 */
c5d120f8 1682 status = nfs_mount(&request);
ec88f28d
CL		 1683 if (status != 0) {
1684 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1685 request.hostname, status);
1686 return status;
1687 }
0076d7b7 1688
ec88f28d
CL		 1689 /*
1690 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1691 */
1692 if (args->mount_server.version != NFS_MNT3_VERSION)
1693 return 0;
1694 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1695}
1696
c12bacec
RL		 1697/*
1698 * Split "dev_name" into "hostname:export_path".
1699 *
1700 * The leftmost colon demarks the split between the server's hostname
1701 * and the export path. If the hostname starts with a left square
1702 * bracket, then it may contain colons.
1703 *
1704 * Note: caller frees hostname and export path, even on error.
1705 */
1706static int nfs_parse_devname(const char *dev_name,
1707 char **hostname, size_t maxnamlen,
1708 char **export_path, size_t maxpathlen)
dc045898
CL		 1709{
1710 size_t len;
c12bacec 1711 char *end;
dc045898 1712
c12bacec
RL		 1713 /* Is the host name protected with square brakcets? */
1714 if (*dev_name == '[') {
1715 end = strchr(++dev_name, ']');
1716 if (end == NULL || end[1] != ':')
dc045898 1717 goto out_bad_devname;
dc045898 1718
c12bacec
RL		 1719 len = end - dev_name;
1720 end++;
1721 } else {
1722 char *comma;
dc045898 1723
c12bacec
RL		 1724 end = strchr(dev_name, ':');
1725 if (end == NULL)
1726 goto out_bad_devname;
1727 len = end - dev_name;
d1aa0825 1728
c12bacec
RL		 1729 /* kill possible hostname list: not supported */
1730 comma = strchr(dev_name, ',');
1731 if (comma != NULL && comma < end)
1732 *comma = 0;
1733 }
d1aa0825 1734
d1aa0825
CL		 1735 if (len > maxnamlen)
1736 goto out_hostname;
1737
1738 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1739 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1740 if (*hostname == NULL)
1741 goto out_nomem;
c12bacec 1742 len = strlen(++end);
d1aa0825
CL		 1743 if (len > maxpathlen)
1744 goto out_path;
1745 *export_path = kstrndup(end, len, GFP_KERNEL);
1746 if (!*export_path)
1747 goto out_nomem;
1748
c12bacec 1749 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1750 return 0;
1751
1752out_bad_devname:
1753 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1754 return -EINVAL;
1755
1756out_nomem:
1757 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1758 return -ENOMEM;
1759
1760out_hostname:
1761 dfprintk(MOUNT, "NFS: server hostname too long\n");
1762 return -ENAMETOOLONG;
1763
1764out_path:
1765 dfprintk(MOUNT, "NFS: export pathname too long\n");
1766 return -ENAMETOOLONG;
1767}
1768
f7b422b1 1769/*
54ceac45
DH		 1770 * Validate the NFS2/NFS3 mount data
1771 * - fills in the mount root filehandle
136d558c
CL		 1772 *
1773 * For option strings, user space handles the following behaviors:
1774 *
1775 * + DNS: mapping server host name to IP address ("addr=" option)
1776 *
1777 * + failure mode: how to behave if a mount request can't be handled
1778 * immediately ("fg/bg" option)
1779 *
1780 * + retry: how often to retry a mount request ("retry=" option)
1781 *
1782 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1783 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1784 */
2283f8d6
TT		 1785static int nfs_validate_mount_data(void *options,
1786 struct nfs_parsed_mount_data *args,
136d558c
CL		 1787 struct nfs_fh *mntfh,
1788 const char *dev_name)
f7b422b1 1789{
2283f8d6 1790 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1791 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1792
5df36e78
CL		 1793 if (data == NULL)
1794 goto out_no_data;
f7b422b1 1795
54ceac45 1796 switch (data->version) {
5df36e78
CL		 1797 case 1:
1798 data->namlen = 0;
1799 case 2:
1800 data->bsize = 0;
1801 case 3:
1802 if (data->flags & NFS_MOUNT_VER3)
1803 goto out_no_v3;
1804 data->root.size = NFS2_FHSIZE;
1805 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1806 case 4:
1807 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1808 goto out_no_sec;
1809 case 5:
1810 memset(data->context, 0, sizeof(data->context));
1811 case 6:
b7e24457
TM		 1812 if (data->flags & NFS_MOUNT_VER3) {
1813 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1814 goto out_invalid_fh;
5df36e78 1815 mntfh->size = data->root.size;
764302cc
CL		 1816 args->version = 3;
1817 } else {
5df36e78 1818 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1819 args->version = 2;
1820 }
5df36e78 1821
5df36e78
CL		 1822
1823 memcpy(mntfh->data, data->root.data, mntfh->size);
1824 if (mntfh->size < sizeof(mntfh->data))
1825 memset(mntfh->data + mntfh->size, 0,
1826 sizeof(mntfh->data) - mntfh->size);
6e88e061 1827
2283f8d6
TT		 1828 /*
1829 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1830 * can deal with.
1831 */
ff3525a5 1832 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1833 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1834 args->rsize = data->rsize;
1835 args->wsize = data->wsize;
2283f8d6
TT		 1836 args->timeo = data->timeo;
1837 args->retrans = data->retrans;
1838 args->acregmin = data->acregmin;
1839 args->acregmax = data->acregmax;
1840 args->acdirmin = data->acdirmin;
1841 args->acdirmax = data->acdirmax;
4c568017 1842
4cfd74fc 1843 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1844 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1845 if (!nfs_verify_server_address(sap))
4c568017
CL		 1846 goto out_no_address;
1847
2283f8d6 1848 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1849 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1850 /* N.B. caller will free nfs_server.hostname in all cases */
1851 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1852 args->namlen = data->namlen;
1853 args->bsize = data->bsize;
dd07c947
CL		 1854
1855 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1856 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1857 if (!args->nfs_server.hostname)
1858 goto out_nomem;
f9c3a380 1859
5eebde23
SJ		 1860 if (!(data->flags & NFS_MOUNT_NONLM))
1861 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1862 NFS_MOUNT_LOCAL_FCNTL);
1863 else
1864 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1865 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1866 /*
1867 * The legacy version 6 binary mount data from userspace has a
1868 * field used only to transport selinux information into the
1869 * the kernel. To continue to support that functionality we
1870 * have a touch of selinux knowledge here in the NFS code. The
1871 * userspace code converted context=blah to just blah so we are
1872 * converting back to the full string selinux understands.
1873 */
1874 if (data->context[0]){
1875#ifdef CONFIG_SECURITY_SELINUX
1876 int rc;
1877 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1878 if (!opts_str)
1879 return -ENOMEM;
1880 strcpy(opts_str, "context=");
1881 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1882 strcat(opts_str, &data->context[0]);
1883 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1884 kfree(opts_str);
1885 if (rc)
1886 return rc;
1887#else
1888 return -EINVAL;
1889#endif
1890 }
1891
5df36e78 1892 break;
136d558c 1893 default: {
136d558c 1894 int status;
136d558c 1895
2283f8d6
TT		 1896 if (nfs_parse_mount_options((char *)options, args) == 0)
1897 return -EINVAL;
136d558c 1898
4cfd74fc 1899 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1900 goto out_no_address;
1901
764302cc
CL		 1902 if (args->version == 4)
1903#ifdef CONFIG_NFS_V4
1904 return nfs4_validate_text_mount_data(options,
1905 args, dev_name);
1906#else
1907 goto out_v4_not_compiled;
1908#endif
1909
f5855fec 1910 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1911
259875ef
TM		 1912 nfs_set_mount_transport_protocol(args);
1913
dc045898
CL		 1914 status = nfs_parse_devname(dev_name,
1915 &args->nfs_server.hostname,
1916 PAGE_SIZE,
1917 &args->nfs_server.export_path,
1918 NFS_MAXPATHLEN);
1919 if (!status)
1920 status = nfs_try_mount(args, mntfh);
136d558c 1921
dc045898
CL		 1922 kfree(args->nfs_server.export_path);
1923 args->nfs_server.export_path = NULL;
136d558c 1924
136d558c 1925 if (status)
fdc6e2c8 1926 return status;
136d558c 1927
136d558c
CL		 1928 break;
1929 }
f7b422b1 1930 }
54ceac45
DH		 1931
1932#ifndef CONFIG_NFS_V3
8a6e5deb 1933 if (args->version == 3)
5df36e78
CL		 1934 goto out_v3_not_compiled;
1935#endif /* !CONFIG_NFS_V3 */
f7b422b1 1936
5df36e78 1937 return 0;
f7b422b1 1938
5df36e78
CL		 1939out_no_data:
1940 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1941 return -EINVAL;
54ceac45 1942
5df36e78
CL		 1943out_no_v3:
1944 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1945 data->version);
1946 return -EINVAL;
f7b422b1 1947
5df36e78
CL		 1948out_no_sec:
1949 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1950 return -EINVAL;
1951
5df36e78
CL		 1952#ifndef CONFIG_NFS_V3
1953out_v3_not_compiled:
1954 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1955 return -EPROTONOSUPPORT;
1956#endif /* !CONFIG_NFS_V3 */
1957
764302cc
CL		 1958#ifndef CONFIG_NFS_V4
1959out_v4_not_compiled:
1960 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1961 return -EPROTONOSUPPORT;
1962#endif /* !CONFIG_NFS_V4 */
1963
63649bd7
CG		 1964out_nomem:
1965 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1966 return -ENOMEM;
1967
5df36e78
CL		 1968out_no_address:
1969 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1970 return -EINVAL;
1971
1972out_invalid_fh:
1973 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1974 return -EINVAL;
f7b422b1
DH		 1975}
1976
48b605f8
JL		 1977static int
1978nfs_compare_remount_data(struct nfs_server *nfss,
1979 struct nfs_parsed_mount_data *data)
1980{
1981 if (data->flags != nfss->flags ||
1982 data->rsize != nfss->rsize ||
1983 data->wsize != nfss->wsize ||
1984 data->retrans != nfss->client->cl_timeout->to_retries ||
1985 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1986 data->acregmin != nfss->acregmin / HZ ||
1987 data->acregmax != nfss->acregmax / HZ ||
1988 data->acdirmin != nfss->acdirmin / HZ ||
1989 data->acdirmax != nfss->acdirmax / HZ ||
1990 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1991 data->nfs_server.port != nfss->port ||
48b605f8 1992 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1993 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1994 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1995 return -EINVAL;
1996
1997 return 0;
1998}
1999
2000static int
2001nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2002{
2003 int error;
2004 struct nfs_server *nfss = sb->s_fs_info;
2005 struct nfs_parsed_mount_data *data;
2006 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2007 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2008 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2009
2010 /*
2011 * Userspace mount programs that send binary options generally send
2012 * them populated with default values. We have no way to know which
2013 * ones were explicitly specified. Fall back to legacy behavior and
2014 * just return success.
2015 */
31c94469
MZ		 2016 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2017 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2018 options->version <= 6))))
48b605f8
JL		 2019 return 0;
2020
2021 data = kzalloc(sizeof(*data), GFP_KERNEL);
2022 if (data == NULL)
2023 return -ENOMEM;
2024
2025 /* fill out struct with values from existing mount */
2026 data->flags = nfss->flags;
2027 data->rsize = nfss->rsize;
2028 data->wsize = nfss->wsize;
2029 data->retrans = nfss->client->cl_timeout->to_retries;
2030 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2031 data->acregmin = nfss->acregmin / HZ;
2032 data->acregmax = nfss->acregmax / HZ;
2033 data->acdirmin = nfss->acdirmin / HZ;
2034 data->acdirmax = nfss->acdirmax / HZ;
2035 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2036 data->nfs_server.port = nfss->port;
48b605f8
JL		 2037 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2038 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2039 data->nfs_server.addrlen);
2040
2041 /* overwrite those values with any that were specified */
2042 error = nfs_parse_mount_options((char *)options, data);
2043 if (error < 0)
2044 goto out;
2045
26c4c170
JL		 2046 /*
2047 * noac is a special case. It implies -o sync, but that's not
2048 * necessarily reflected in the mtab options. do_remount_sb
2049 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2050 * remount options, so we have to explicitly reset it.
2051 */
2052 if (data->flags & NFS_MOUNT_NOAC)
2053 *flags |= MS_SYNCHRONOUS;
2054
48b605f8
JL		 2055 /* compare new mount options with old ones */
2056 error = nfs_compare_remount_data(nfss, data);
2057out:
2058 kfree(data);
2059 return error;
2060}
2061
f7b422b1 2062/*
54ceac45 2063 * Initialise the common bits of the superblock
f7b422b1 2064 */
54ceac45 2065static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2066{
54ceac45 2067 struct nfs_server *server = NFS_SB(sb);
5006a76c 2068
54ceac45 2069 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2070
54ceac45
DH		 2071 /* We probably want something more informative here */
2072 snprintf(sb->s_id, sizeof(sb->s_id),
2073 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2074
54ceac45
DH		 2075 if (sb->s_blocksize == 0)
2076 sb->s_blocksize = nfs_block_bits(server->wsize,
2077 &sb->s_blocksize_bits);
f7b422b1 2078
32a88aa1
JA		 2079 sb->s_bdi = &server->backing_dev_info;
2080
54ceac45 2081 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2082}
2083
2084/*
54ceac45 2085 * Finish setting up an NFS2/3 superblock
f7b422b1 2086 */
2283f8d6
TT		 2087static void nfs_fill_super(struct super_block *sb,
2088 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2089{
2090 struct nfs_server *server = NFS_SB(sb);
5006a76c 2091
54ceac45
DH		 2092 sb->s_blocksize_bits = 0;
2093 sb->s_blocksize = 0;
2094 if (data->bsize)
2095 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2096
8a6e5deb 2097 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2098 /* The VFS shouldn't apply the umask to mode bits. We will do
2099 * so ourselves when necessary.
2100 */
2101 sb->s_flags |= MS_POSIXACL;
2102 sb->s_time_gran = 1;
816724e6 2103 }
54ceac45
DH		 2104
2105 sb->s_op = &nfs_sops;
2106 nfs_initialise_sb(sb);
f7b422b1
DH		 2107}
2108
2109/*
54ceac45 2110 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2111 */
54ceac45
DH		 2112static void nfs_clone_super(struct super_block *sb,
2113 const struct super_block *old_sb)
f7b422b1 2114{
54ceac45
DH		 2115 struct nfs_server *server = NFS_SB(sb);
2116
2117 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2118 sb->s_blocksize = old_sb->s_blocksize;
2119 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2120
8a6e5deb 2121 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2122 /* The VFS shouldn't apply the umask to mode bits. We will do
2123 * so ourselves when necessary.
f7b422b1
DH		 2124 */
2125 sb->s_flags |= MS_POSIXACL;
f7b422b1 2126 sb->s_time_gran = 1;
f7b422b1
DH		 2127 }
2128
54ceac45
DH		 2129 sb->s_op = old_sb->s_op;
2130 nfs_initialise_sb(sb);
f7b422b1
DH		 2131}
2132
275a5d24
TM		 2133static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2134{
2135 const struct nfs_server *a = s->s_fs_info;
2136 const struct rpc_clnt *clnt_a = a->client;
2137 const struct rpc_clnt *clnt_b = b->client;
2138
2139 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2140 goto Ebusy;
2141 if (a->nfs_client != b->nfs_client)
2142 goto Ebusy;
2143 if (a->flags != b->flags)
2144 goto Ebusy;
2145 if (a->wsize != b->wsize)
2146 goto Ebusy;
2147 if (a->rsize != b->rsize)
2148 goto Ebusy;
2149 if (a->acregmin != b->acregmin)
2150 goto Ebusy;
2151 if (a->acregmax != b->acregmax)
2152 goto Ebusy;
2153 if (a->acdirmin != b->acdirmin)
2154 goto Ebusy;
2155 if (a->acdirmax != b->acdirmax)
2156 goto Ebusy;
2157 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2158 goto Ebusy;
e89a5a43 2159 return 1;
275a5d24 2160Ebusy:
e89a5a43
TM		 2161 return 0;
2162}
2163
2164struct nfs_sb_mountdata {
2165 struct nfs_server *server;
2166 int mntflags;
2167};
2168
2169static int nfs_set_super(struct super_block *s, void *data)
2170{
2171 struct nfs_sb_mountdata *sb_mntdata = data;
2172 struct nfs_server *server = sb_mntdata->server;
2173 int ret;
2174
2175 s->s_flags = sb_mntdata->mntflags;
2176 s->s_fs_info = server;
8b244ff2 2177 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2178 ret = set_anon_super(s, server);
2179 if (ret == 0)
2180 server->s_dev = s->s_dev;
2181 return ret;
2182}
2183
fd00a8ff
CL		 2184static int nfs_compare_super_address(struct nfs_server *server1,
2185 struct nfs_server *server2)
2186{
2187 struct sockaddr *sap1, *sap2;
2188
2189 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2190 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2191
2192 if (sap1->sa_family != sap2->sa_family)
2193 return 0;
2194
2195 switch (sap1->sa_family) {
2196 case AF_INET: {
2197 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2198 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2199 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2200 return 0;
2201 if (sin1->sin_port != sin2->sin_port)
2202 return 0;
2203 break;
2204 }
2205 case AF_INET6: {
2206 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2207 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2208 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2209 return 0;
2210 if (sin1->sin6_port != sin2->sin6_port)
2211 return 0;
2212 break;
2213 }
2214 default:
2215 return 0;
2216 }
2217
2218 return 1;
2219}
2220
e89a5a43
TM		 2221static int nfs_compare_super(struct super_block *sb, void *data)
2222{
2223 struct nfs_sb_mountdata *sb_mntdata = data;
2224 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2225 int mntflags = sb_mntdata->mntflags;
2226
fd00a8ff 2227 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2228 return 0;
2229 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2230 if (old->flags & NFS_MOUNT_UNSHARED)
2231 return 0;
2232 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2233 return 0;
2234 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2235}
2236
fa799759
MS		 2237static int nfs_bdi_register(struct nfs_server *server)
2238{
2239 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2240}
2241
01194981
AV		 2242static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2243 int flags, const char *dev_name, void *raw_data)
f7b422b1 2244{
f7b422b1
DH		 2245 struct nfs_server *server = NULL;
2246 struct super_block *s;
33852a1f
TM		 2247 struct nfs_parsed_mount_data *data;
2248 struct nfs_fh *mntfh;
01194981 2249 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2250 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2251 struct nfs_sb_mountdata sb_mntdata = {
2252 .mntflags = flags,
2253 };
01194981 2254 int error;
33852a1f 2255
1e657bd5 2256 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2257 mntfh = nfs_alloc_fhandle();
33852a1f 2258 if (data == NULL || mntfh == NULL)
8a0d551a 2259 goto out;
f9c3a380 2260
54ceac45 2261 /* Validate the mount data */
33852a1f 2262 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2263 if (error < 0) {
2264 mntroot = ERR_PTR(error);
0655960f 2265 goto out;
01194981 2266 }
f7b422b1 2267
764302cc
CL		 2268#ifdef CONFIG_NFS_V4
2269 if (data->version == 4) {
01194981 2270 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc
CL		 2271 goto out;
2272 }
2273#endif /* CONFIG_NFS_V4 */
2274
54ceac45 2275 /* Get a volume representation */
33852a1f 2276 server = nfs_create_server(data, mntfh);
54ceac45 2277 if (IS_ERR(server)) {
01194981 2278 mntroot = ERR_CAST(server);
0655960f 2279 goto out;
f7b422b1 2280 }
e89a5a43 2281 sb_mntdata.server = server;
f7b422b1 2282
75180df2
TM		 2283 if (server->flags & NFS_MOUNT_UNSHARED)
2284 compare_super = NULL;
2285
fb2088cc
SP		 2286 /* -o noac implies -o sync */
2287 if (server->flags & NFS_MOUNT_NOAC)
2288 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2289
54ceac45 2290 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2291 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2292 if (IS_ERR(s)) {
01194981 2293 mntroot = ERR_CAST(s);
54ceac45 2294 goto out_err_nosb;
816724e6
TM		 2295 }
2296
54ceac45
DH		 2297 if (s->s_fs_info != server) {
2298 nfs_free_server(server);
2299 server = NULL;
fa799759
MS		 2300 } else {
2301 error = nfs_bdi_register(server);
01194981
AV		 2302 if (error) {
2303 mntroot = ERR_PTR(error);
cfbc0683 2304 goto error_splat_bdi;
01194981 2305 }
54ceac45 2306 }
f7b422b1 2307
54ceac45
DH		 2308 if (!s->s_root) {
2309 /* initial superblock/root creation */
33852a1f 2310 nfs_fill_super(s, data);
160bc160 2311 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2312 }
f7b422b1 2313
0d5839ad 2314 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2315 if (IS_ERR(mntroot))
54ceac45 2316 goto error_splat_super;
816724e6 2317
33852a1f 2318 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2319 if (error)
2320 goto error_splat_root;
2321
54ceac45 2322 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2323
2324out:
8a0d551a 2325 nfs_free_parsed_mount_data(data);
b157b06c 2326 nfs_free_fhandle(mntfh);
01194981 2327 return mntroot;
816724e6 2328
54ceac45
DH		 2329out_err_nosb:
2330 nfs_free_server(server);
0655960f 2331 goto out;
54ceac45 2332
f9c3a380
EP		 2333error_splat_root:
2334 dput(mntroot);
01194981 2335 mntroot = ERR_PTR(error);
54ceac45 2336error_splat_super:
cfbc0683
N		 2337 if (server && !s->s_root)
2338 bdi_unregister(&server->backing_dev_info);
2339error_splat_bdi:
6f5bbff9 2340 deactivate_locked_super(s);
0655960f 2341 goto out;
f7b422b1
DH		 2342}
2343
387c149b
TM		 2344/*
2345 * Ensure that we unregister the bdi before kill_anon_super
2346 * releases the device name
2347 */
2348static void nfs_put_super(struct super_block *s)
2349{
2350 struct nfs_server *server = NFS_SB(s);
2351
2352 bdi_unregister(&server->backing_dev_info);
2353}
2354
54ceac45
DH		 2355/*
2356 * Destroy an NFS2/3 superblock
2357 */
f7b422b1
DH		 2358static void nfs_kill_super(struct super_block *s)
2359{
2360 struct nfs_server *server = NFS_SB(s);
2361
2362 kill_anon_super(s);
08734048 2363 nfs_fscache_release_super_cookie(s);
54ceac45 2364 nfs_free_server(server);
f7b422b1
DH		 2365}
2366
54ceac45
DH		 2367/*
2368 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2369 */
31f43471
AV		 2370static struct dentry *
2371nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2372 const char *dev_name, void *raw_data)
f7b422b1
DH		 2373{
2374 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2375 struct super_block *s;
2376 struct nfs_server *server;
2377 struct dentry *mntroot;
75180df2 2378 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2379 struct nfs_sb_mountdata sb_mntdata = {
2380 .mntflags = flags,
2381 };
54ceac45 2382 int error;
f7b422b1 2383
31f43471 2384 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2385
54ceac45
DH		 2386 /* create a new volume representation */
2387 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2388 if (IS_ERR(server)) {
2389 error = PTR_ERR(server);
2390 goto out_err_noserver;
2391 }
e89a5a43 2392 sb_mntdata.server = server;
8fa5c000 2393
75180df2
TM		 2394 if (server->flags & NFS_MOUNT_UNSHARED)
2395 compare_super = NULL;
2396
fb2088cc
SP		 2397 /* -o noac implies -o sync */
2398 if (server->flags & NFS_MOUNT_NOAC)
2399 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2400
54ceac45 2401 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2402 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2403 if (IS_ERR(s)) {
2404 error = PTR_ERR(s);
2405 goto out_err_nosb;
2406 }
5006a76c 2407
54ceac45
DH		 2408 if (s->s_fs_info != server) {
2409 nfs_free_server(server);
2410 server = NULL;
fa799759
MS		 2411 } else {
2412 error = nfs_bdi_register(server);
2413 if (error)
cfbc0683 2414 goto error_splat_bdi;
f7b422b1 2415 }
24c8dbbb 2416
54ceac45
DH		 2417 if (!s->s_root) {
2418 /* initial superblock/root creation */
54ceac45 2419 nfs_clone_super(s, data->sb);
2df54806 2420 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2421 }
f7b422b1 2422
0d5839ad 2423 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2424 if (IS_ERR(mntroot)) {
2425 error = PTR_ERR(mntroot);
2426 goto error_splat_super;
f7b422b1 2427 }
e9cc6c23 2428 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2429 dput(mntroot);
2430 error = -ESTALE;
2431 goto error_splat_super;
2432 }
f7b422b1 2433
54ceac45 2434 s->s_flags |= MS_ACTIVE;
f7b422b1 2435
f9c3a380
EP		 2436 /* clone any lsm security options from the parent to the new sb */
2437 security_sb_clone_mnt_opts(data->sb, s);
2438
31f43471
AV		 2439 dprintk("<-- nfs_xdev_mount() = 0\n");
2440 return mntroot;
24c8dbbb 2441
54ceac45
DH		 2442out_err_nosb:
2443 nfs_free_server(server);
2444out_err_noserver:
31f43471
AV		 2445 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2446 return ERR_PTR(error);
f7b422b1 2447
54ceac45 2448error_splat_super:
cfbc0683
N		 2449 if (server && !s->s_root)
2450 bdi_unregister(&server->backing_dev_info);
2451error_splat_bdi:
6f5bbff9 2452 deactivate_locked_super(s);
31f43471
AV		 2453 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2454 return ERR_PTR(error);
f7b422b1
DH		 2455}
2456
54ceac45
DH		 2457#ifdef CONFIG_NFS_V4
2458
f7b422b1 2459/*
54ceac45 2460 * Finish setting up a cloned NFS4 superblock
f7b422b1 2461 */
54ceac45
DH		 2462static void nfs4_clone_super(struct super_block *sb,
2463 const struct super_block *old_sb)
f7b422b1 2464{
54ceac45
DH		 2465 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2466 sb->s_blocksize = old_sb->s_blocksize;
2467 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2468 sb->s_time_gran = 1;
54ceac45 2469 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2470 /*
2471 * The VFS shouldn't apply the umask to mode bits. We will do
2472 * so ourselves when necessary.
2473 */
2474 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2475 sb->s_xattr = old_sb->s_xattr;
2476 nfs_initialise_sb(sb);
f7b422b1
DH		 2477}
2478
54ceac45
DH		 2479/*
2480 * Set up an NFS4 superblock
2481 */
2482static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2483{
54ceac45
DH		 2484 sb->s_time_gran = 1;
2485 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2486 /*
2487 * The VFS shouldn't apply the umask to mode bits. We will do
2488 * so ourselves when necessary.
2489 */
2490 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2491 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2492 nfs_initialise_sb(sb);
f7b422b1
DH		 2493}
2494
01c3f052
TM		 2495static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2496{
5eebde23
SJ		 2497 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2498 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2499}
2500
7630c852
CL		 2501static int nfs4_validate_text_mount_data(void *options,
2502 struct nfs_parsed_mount_data *args,
2503 const char *dev_name)
2504{
2505 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2506
f5855fec 2507 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2508
2509 nfs_validate_transport_protocol(args);
2510
2511 nfs4_validate_mount_flags(args);
2512
2ecda72b
TM		 2513 if (args->version != 4) {
2514 dfprintk(MOUNT,
2515 "NFS4: Illegal mount version\n");
2516 return -EINVAL;
2517 }
2518
7630c852
CL		 2519 if (args->auth_flavor_len > 1) {
2520 dfprintk(MOUNT,
2521 "NFS4: Too many RPC auth flavours specified\n");
2522 return -EINVAL;
2523 }
2524
2525 if (args->client_address == NULL) {
2526 dfprintk(MOUNT,
2527 "NFS4: mount program didn't pass callback address\n");
2528 return -EINVAL;
2529 }
2530
2531 return nfs_parse_devname(dev_name,
2532 &args->nfs_server.hostname,
2533 NFS4_MAXNAMLEN,
2534 &args->nfs_server.export_path,
2535 NFS4_MAXPATHLEN);
2536}
2537
f0768ebd
CL		 2538/*
2539 * Validate NFSv4 mount options
2540 */
91ea40b9
TT		 2541static int nfs4_validate_mount_data(void *options,
2542 struct nfs_parsed_mount_data *args,
2543 const char *dev_name)
f0768ebd 2544{
4cfd74fc 2545 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2546 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2547 char *c;
2548
2549 if (data == NULL)
2550 goto out_no_data;
2551
2552 switch (data->version) {
2553 case 1:
4c568017
CL		 2554 if (data->host_addrlen > sizeof(args->nfs_server.address))
2555 goto out_no_address;
2556 if (data->host_addrlen == 0)
f0768ebd 2557 goto out_no_address;
4c568017 2558 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2559 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2560 return -EFAULT;
4cfd74fc 2561 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2562 goto out_no_address;
2563
6738b251
CL		 2564 if (data->auth_flavourlen) {
2565 if (data->auth_flavourlen > 1)
2566 goto out_inval_auth;
20c71f5e 2567 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2568 data->auth_flavours,
20c71f5e 2569 sizeof(args->auth_flavors[0])))
f0768ebd 2570 return -EFAULT;
f0768ebd
CL		 2571 }
2572
2573 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2574 if (IS_ERR(c))
2575 return PTR_ERR(c);
91ea40b9 2576 args->nfs_server.hostname = c;
f0768ebd
CL		 2577
2578 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2579 if (IS_ERR(c))
2580 return PTR_ERR(c);
91ea40b9
TT		 2581 args->nfs_server.export_path = c;
2582 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2583
2584 c = strndup_user(data->client_addr.data, 16);
2585 if (IS_ERR(c))
2586 return PTR_ERR(c);
91ea40b9
TT		 2587 args->client_address = c;
2588
2589 /*
2590 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2591 * can deal with.
2592 */
2593
2594 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2595 args->rsize = data->rsize;
2596 args->wsize = data->wsize;
2597 args->timeo = data->timeo;
2598 args->retrans = data->retrans;
2599 args->acregmin = data->acregmin;
2600 args->acregmax = data->acregmax;
2601 args->acdirmin = data->acdirmin;
2602 args->acdirmax = data->acdirmax;
2603 args->nfs_server.protocol = data->proto;
259875ef 2604 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2605
2606 break;
7630c852 2607 default:
91ea40b9 2608 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2609 return -EINVAL;
2610
4cfd74fc 2611 if (!nfs_verify_server_address(sap))
80071225 2612 return -EINVAL;
dc045898 2613
7630c852 2614 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2615 }
2616
2617 return 0;
2618
2619out_no_data:
2620 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2621 return -EINVAL;
2622
2623out_inval_auth:
2624 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2625 data->auth_flavourlen);
2626 return -EINVAL;
2627
2628out_no_address:
2629 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2630 return -EINVAL;
f0768ebd
CL		 2631}
2632
54ceac45 2633/*
c02d7adf 2634 * Get the superblock for the NFS4 root partition
54ceac45 2635 */
31f43471
AV		 2636static struct dentry *
2637nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2638 const char *dev_name, void *raw_data)
f7b422b1 2639{
c02d7adf 2640 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2641 struct super_block *s;
2642 struct nfs_server *server;
33852a1f 2643 struct nfs_fh *mntfh;
54ceac45 2644 struct dentry *mntroot;
75180df2 2645 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2646 struct nfs_sb_mountdata sb_mntdata = {
2647 .mntflags = flags,
2648 };
33852a1f
TM		 2649 int error = -ENOMEM;
2650
b157b06c 2651 mntfh = nfs_alloc_fhandle();
33852a1f 2652 if (data == NULL || mntfh == NULL)
8a0d551a 2653 goto out;
f9c3a380 2654
54ceac45 2655 /* Get a volume representation */
33852a1f 2656 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2657 if (IS_ERR(server)) {
2658 error = PTR_ERR(server);
29eb981a 2659 goto out;
f7b422b1 2660 }
e89a5a43 2661 sb_mntdata.server = server;
f7b422b1 2662
75180df2
TM		 2663 if (server->flags & NFS4_MOUNT_UNSHARED)
2664 compare_super = NULL;
2665
fb2088cc
SP		 2666 /* -o noac implies -o sync */
2667 if (server->flags & NFS_MOUNT_NOAC)
2668 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2669
54ceac45 2670 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2671 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2672 if (IS_ERR(s)) {
2673 error = PTR_ERR(s);
f7b422b1 2674 goto out_free;
816724e6
TM		 2675 }
2676
5dd3177a
TM		 2677 if (s->s_fs_info != server) {
2678 nfs_free_server(server);
2679 server = NULL;
fa799759
MS		 2680 } else {
2681 error = nfs_bdi_register(server);
2682 if (error)
cfbc0683 2683 goto error_splat_bdi;
5dd3177a
TM		 2684 }
2685
54ceac45
DH		 2686 if (!s->s_root) {
2687 /* initial superblock/root creation */
54ceac45 2688 nfs4_fill_super(s);
c15c928f 2689 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2690 }
f7b422b1 2691
0d5839ad 2692 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2693 if (IS_ERR(mntroot)) {
2694 error = PTR_ERR(mntroot);
2695 goto error_splat_super;
f7b422b1 2696 }
54ceac45 2697
33852a1f 2698 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2699 if (error)
2700 goto error_splat_root;
2701
f7b422b1 2702 s->s_flags |= MS_ACTIVE;
31f43471 2703
31f43471
AV		 2704 nfs_free_fhandle(mntfh);
2705 return mntroot;
29eb981a
CL		 2706
2707out:
b157b06c 2708 nfs_free_fhandle(mntfh);
31f43471 2709 return ERR_PTR(error);
54ceac45 2710
f7b422b1 2711out_free:
54ceac45 2712 nfs_free_server(server);
29eb981a 2713 goto out;
54ceac45 2714
46c8ac74
EP		 2715error_splat_root:
2716 dput(mntroot);
54ceac45 2717error_splat_super:
cfbc0683
N		 2718 if (server && !s->s_root)
2719 bdi_unregister(&server->backing_dev_info);
2720error_splat_bdi:
6f5bbff9 2721 deactivate_locked_super(s);
29eb981a 2722 goto out;
f7b422b1
DH		 2723}
2724
c02d7adf
TM		 2725static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2726 int flags, void *data, const char *hostname)
2727{
2728 struct vfsmount *root_mnt;
2729 char *root_devname;
2730 size_t len;
2731
2732 len = strlen(hostname) + 3;
2733 root_devname = kmalloc(len, GFP_KERNEL);
2734 if (root_devname == NULL)
2735 return ERR_PTR(-ENOMEM);
2736 snprintf(root_devname, len, "%s:/", hostname);
2737 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2738 kfree(root_devname);
2739 return root_mnt;
2740}
2741
ce587e07
TM		 2742struct nfs_referral_count {
2743 struct list_head list;
2744 const struct task_struct *task;
2745 unsigned int referral_count;
2746};
2747
2748static LIST_HEAD(nfs_referral_count_list);
2749static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2750
2751static struct nfs_referral_count *nfs_find_referral_count(void)
2752{
2753 struct nfs_referral_count *p;
2754
2755 list_for_each_entry(p, &nfs_referral_count_list, list) {
2756 if (p->task == current)
2757 return p;
2758 }
2759 return NULL;
2760}
2761
2762#define NFS_MAX_NESTED_REFERRALS 2
2763
2764static int nfs_referral_loop_protect(void)
2765{
2766 struct nfs_referral_count *p, *new;
2767 int ret = -ENOMEM;
2768
2769 new = kmalloc(sizeof(*new), GFP_KERNEL);
2770 if (!new)
2771 goto out;
2772 new->task = current;
2773 new->referral_count = 1;
2774
2775 ret = 0;
2776 spin_lock(&nfs_referral_count_list_lock);
2777 p = nfs_find_referral_count();
2778 if (p != NULL) {
2779 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2780 ret = -ELOOP;
2781 else
2782 p->referral_count++;
2783 } else {
2784 list_add(&new->list, &nfs_referral_count_list);
2785 new = NULL;
2786 }
2787 spin_unlock(&nfs_referral_count_list_lock);
2788 kfree(new);
2789out:
2790 return ret;
2791}
2792
2793static void nfs_referral_loop_unprotect(void)
2794{
2795 struct nfs_referral_count *p;
2796
2797 spin_lock(&nfs_referral_count_list_lock);
2798 p = nfs_find_referral_count();
2799 p->referral_count--;
2800 if (p->referral_count == 0)
2801 list_del(&p->list);
2802 else
2803 p = NULL;
2804 spin_unlock(&nfs_referral_count_list_lock);
2805 kfree(p);
2806}
2807
01194981
AV		 2808static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2809 const char *export_path)
c02d7adf 2810{
01194981 2811 struct dentry *dentry;
5352d3b6 2812 int err;
c02d7adf 2813
5352d3b6
AV		 2814 if (IS_ERR(root_mnt))
2815 return ERR_CAST(root_mnt);
2816
2817 err = nfs_referral_loop_protect();
2818 if (err) {
ea441d11 2819 mntput(root_mnt);
5352d3b6 2820 return ERR_PTR(err);
ea441d11 2821 }
c02d7adf 2822
ea441d11
AV		 2823 dentry = mount_subtree(root_mnt, export_path);
2824 nfs_referral_loop_unprotect();
c02d7adf 2825
01194981 2826 return dentry;
c02d7adf
TM		 2827}
2828
01194981
AV		 2829static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2830 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2831{
2832 char *export_path;
2833 struct vfsmount *root_mnt;
01194981 2834 struct dentry *res;
a6fe23be
CL		 2835
2836 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2837
2838 export_path = data->nfs_server.export_path;
2839 data->nfs_server.export_path = "/";
2840 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2841 data->nfs_server.hostname);
2842 data->nfs_server.export_path = export_path;
2843
5352d3b6 2844 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2845
01194981
AV		 2846 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2847 IS_ERR(res) ? PTR_ERR(res) : 0,
2848 IS_ERR(res) ? " [error]" : "");
2849 return res;
a6fe23be
CL		 2850}
2851
c02d7adf
TM		 2852/*
2853 * Get the superblock for an NFS4 mountpoint
2854 */
01194981
AV		 2855static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2856 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2857{
2858 struct nfs_parsed_mount_data *data;
c02d7adf 2859 int error = -ENOMEM;
01194981 2860 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2861
c5811dbd 2862 data = nfs_alloc_parsed_mount_data(4);
c02d7adf 2863 if (data == NULL)
8a0d551a 2864 goto out;
c02d7adf
TM		 2865
2866 /* Validate the mount data */
2867 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2868 if (error < 0) {
2869 res = ERR_PTR(error);
c02d7adf 2870 goto out;
01194981 2871 }
c02d7adf 2872
01194981
AV		 2873 res = nfs4_try_mount(flags, dev_name, data);
2874 if (IS_ERR(res))
2875 error = PTR_ERR(res);
c02d7adf
TM		 2876
2877out:
8a0d551a 2878 nfs_free_parsed_mount_data(data);
01194981 2879 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2880 error != 0 ? " [error]" : "");
01194981 2881 return res;
c02d7adf
TM		 2882}
2883
f7b422b1
DH		 2884static void nfs4_kill_super(struct super_block *sb)
2885{
2886 struct nfs_server *server = NFS_SB(sb);
2887
0f3e66c6 2888 dprintk("--> %s\n", __func__);
515d8611 2889 nfs_super_return_all_delegations(sb);
f7b422b1 2890 kill_anon_super(sb);
08734048 2891 nfs_fscache_release_super_cookie(sb);
54ceac45 2892 nfs_free_server(server);
0f3e66c6 2893 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2894}
2895
2896/*
54ceac45 2897 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2898 */
31f43471
AV		 2899static struct dentry *
2900nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2901 const char *dev_name, void *raw_data)
f7b422b1 2902{
54ceac45
DH		 2903 struct nfs_clone_mount *data = raw_data;
2904 struct super_block *s;
2905 struct nfs_server *server;
2906 struct dentry *mntroot;
75180df2 2907 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2908 struct nfs_sb_mountdata sb_mntdata = {
2909 .mntflags = flags,
2910 };
54ceac45 2911 int error;
f7b422b1 2912
31f43471 2913 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2914
54ceac45
DH		 2915 /* create a new volume representation */
2916 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2917 if (IS_ERR(server)) {
2918 error = PTR_ERR(server);
2919 goto out_err_noserver;
f7b422b1 2920 }
e89a5a43 2921 sb_mntdata.server = server;
f7b422b1 2922
75180df2
TM		 2923 if (server->flags & NFS4_MOUNT_UNSHARED)
2924 compare_super = NULL;
2925
fb2088cc
SP		 2926 /* -o noac implies -o sync */
2927 if (server->flags & NFS_MOUNT_NOAC)
2928 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2929
54ceac45 2930 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2931 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2932 if (IS_ERR(s)) {
2933 error = PTR_ERR(s);
2934 goto out_err_nosb;
f7b422b1 2935 }
f7b422b1 2936
54ceac45
DH		 2937 if (s->s_fs_info != server) {
2938 nfs_free_server(server);
2939 server = NULL;
fa799759
MS		 2940 } else {
2941 error = nfs_bdi_register(server);
2942 if (error)
cfbc0683 2943 goto error_splat_bdi;
54ceac45 2944 }
f7b422b1 2945
54ceac45
DH		 2946 if (!s->s_root) {
2947 /* initial superblock/root creation */
54ceac45 2948 nfs4_clone_super(s, data->sb);
2df54806 2949 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2950 }
f7b422b1 2951
0d5839ad 2952 mntroot = nfs4_get_root(s, data->fh, dev_name);
54ceac45
DH		 2953 if (IS_ERR(mntroot)) {
2954 error = PTR_ERR(mntroot);
2955 goto error_splat_super;
2956 }
e9cc6c23
TM		 2957 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2958 dput(mntroot);
2959 error = -ESTALE;
2960 goto error_splat_super;
2961 }
f7b422b1 2962
54ceac45 2963 s->s_flags |= MS_ACTIVE;
54ceac45 2964
46c8ac74
EP		 2965 security_sb_clone_mnt_opts(data->sb, s);
2966
31f43471
AV		 2967 dprintk("<-- nfs4_xdev_mount() = 0\n");
2968 return mntroot;
54ceac45
DH		 2969
2970out_err_nosb:
2971 nfs_free_server(server);
2972out_err_noserver:
31f43471
AV		 2973 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2974 return ERR_PTR(error);
54ceac45
DH		 2975
2976error_splat_super:
cfbc0683
N		 2977 if (server && !s->s_root)
2978 bdi_unregister(&server->backing_dev_info);
2979error_splat_bdi:
6f5bbff9 2980 deactivate_locked_super(s);
31f43471
AV		 2981 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2982 return ERR_PTR(error);
f7b422b1
DH		 2983}
2984
31f43471
AV		 2985static struct dentry *
2986nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2987 const char *dev_name, void *raw_data)
f7b422b1
DH		 2988{
2989 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2990 struct super_block *s;
2991 struct nfs_server *server;
2992 struct dentry *mntroot;
4f727296 2993 struct nfs_fh *mntfh;
75180df2 2994 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2995 struct nfs_sb_mountdata sb_mntdata = {
2996 .mntflags = flags,
2997 };
4f727296 2998 int error = -ENOMEM;
54ceac45
DH		 2999
3000 dprintk("--> nfs4_referral_get_sb()\n");
3001
4f727296
TM		 3002 mntfh = nfs_alloc_fhandle();
3003 if (mntfh == NULL)
3004 goto out_err_nofh;
3005
54ceac45 3006 /* create a new volume representation */
4f727296 3007 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3008 if (IS_ERR(server)) {
3009 error = PTR_ERR(server);
3010 goto out_err_noserver;
3011 }
e89a5a43 3012 sb_mntdata.server = server;
54ceac45 3013
75180df2
TM		 3014 if (server->flags & NFS4_MOUNT_UNSHARED)
3015 compare_super = NULL;
3016
fb2088cc
SP		 3017 /* -o noac implies -o sync */
3018 if (server->flags & NFS_MOUNT_NOAC)
3019 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3020
54ceac45 3021 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3022 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3023 if (IS_ERR(s)) {
3024 error = PTR_ERR(s);
3025 goto out_err_nosb;
3026 }
3027
3028 if (s->s_fs_info != server) {
3029 nfs_free_server(server);
3030 server = NULL;
fa799759
MS		 3031 } else {
3032 error = nfs_bdi_register(server);
3033 if (error)
cfbc0683 3034 goto error_splat_bdi;
54ceac45
DH		 3035 }
3036
3037 if (!s->s_root) {
3038 /* initial superblock/root creation */
54ceac45 3039 nfs4_fill_super(s);
2df54806 3040 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3041 }
3042
0d5839ad 3043 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 3044 if (IS_ERR(mntroot)) {
3045 error = PTR_ERR(mntroot);
3046 goto error_splat_super;
3047 }
e9cc6c23
TM		 3048 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3049 dput(mntroot);
3050 error = -ESTALE;
3051 goto error_splat_super;
3052 }
54ceac45
DH		 3053
3054 s->s_flags |= MS_ACTIVE;
54ceac45 3055
46c8ac74
EP		 3056 security_sb_clone_mnt_opts(data->sb, s);
3057
4f727296 3058 nfs_free_fhandle(mntfh);
54ceac45 3059 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3060 return mntroot;
54ceac45
DH		 3061
3062out_err_nosb:
3063 nfs_free_server(server);
3064out_err_noserver:
4f727296
TM		 3065 nfs_free_fhandle(mntfh);
3066out_err_nofh:
54ceac45 3067 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3068 return ERR_PTR(error);
54ceac45
DH		 3069
3070error_splat_super:
cfbc0683
N		 3071 if (server && !s->s_root)
3072 bdi_unregister(&server->backing_dev_info);
3073error_splat_bdi:
6f5bbff9 3074 deactivate_locked_super(s);
4f727296 3075 nfs_free_fhandle(mntfh);
54ceac45 3076 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3077 return ERR_PTR(error);
f7b422b1
DH		 3078}
3079
c02d7adf
TM		 3080/*
3081 * Create an NFS4 server record on referral traversal
3082 */
01194981
AV		 3083static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3084 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 3085{
3086 struct nfs_clone_mount *data = raw_data;
3087 char *export_path;
3088 struct vfsmount *root_mnt;
01194981 3089 struct dentry *res;
c02d7adf 3090
01194981 3091 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 3092
3093 export_path = data->mnt_path;
3094 data->mnt_path = "/";
3095
3096 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3097 flags, data, data->hostname);
3098 data->mnt_path = export_path;
3099
5352d3b6 3100 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 3101 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3102 IS_ERR(res) ? PTR_ERR(res) : 0,
3103 IS_ERR(res) ? " [error]" : "");
3104 return res;
c02d7adf
TM		 3105}
3106
54ceac45 3107#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)