2 * Copyright (C) 2005-2012 Junjiro R. Okajima
4 * This program, aufs is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * sysfs interface and lifetime management
21 * they are necessary regardless sysfs is disabled.
24 #include <linux/random.h>
27 unsigned long sysaufs_si_mask;
28 struct kset *sysaufs_kset;
30 #define AuSiAttr(_name) { \
31 .attr = { .name = __stringify(_name), .mode = 0444 }, \
32 .show = sysaufs_si_##_name, \
35 static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path);
36 struct attribute *sysaufs_si_attrs[] = {
37 &sysaufs_si_attr_xi_path.attr,
41 static const struct sysfs_ops au_sbi_ops = {
42 .show = sysaufs_si_show
45 static struct kobj_type au_sbi_ktype = {
46 .release = au_si_free,
47 .sysfs_ops = &au_sbi_ops,
48 .default_attrs = sysaufs_si_attrs
51 /* ---------------------------------------------------------------------- */
53 int sysaufs_si_init(struct au_sbinfo *sbinfo)
57 sbinfo->si_kobj.kset = sysaufs_kset;
58 /* cf. sysaufs_name() */
59 err = kobject_init_and_add
60 (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL,
61 SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo));
63 dbgaufs_si_null(sbinfo);
65 err = dbgaufs_si_init(sbinfo);
67 kobject_put(&sbinfo->si_kobj);
72 void sysaufs_fin(void)
75 sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group);
76 kset_unregister(sysaufs_kset);
79 int __init sysaufs_init(void)
84 get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask));
85 } while (!sysaufs_si_mask);
88 sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj);
89 if (unlikely(!sysaufs_kset))
91 err = PTR_ERR(sysaufs_kset);
92 if (IS_ERR(sysaufs_kset))
94 err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group);
96 kset_unregister(sysaufs_kset);
100 err = dbgaufs_init();