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b6450630 SF |
1 | /* |
2 | * Copyright (C) 2005-2017 Junjiro R. Okajima | |
3 | * | |
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. | |
8 | * | |
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. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * sysfs interface and lifetime management | |
20 | * they are necessary regardless sysfs is disabled. | |
21 | */ | |
22 | ||
23 | #include <linux/random.h> | |
24 | #include "aufs.h" | |
25 | ||
26 | unsigned long sysaufs_si_mask; | |
27 | struct kset *sysaufs_kset; | |
28 | ||
29 | #define AuSiAttr(_name) { \ | |
30 | .attr = { .name = __stringify(_name), .mode = 0444 }, \ | |
31 | .show = sysaufs_si_##_name, \ | |
32 | } | |
33 | ||
34 | static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path); | |
35 | struct attribute *sysaufs_si_attrs[] = { | |
36 | &sysaufs_si_attr_xi_path.attr, | |
37 | NULL, | |
38 | }; | |
39 | ||
40 | static const struct sysfs_ops au_sbi_ops = { | |
41 | .show = sysaufs_si_show | |
42 | }; | |
43 | ||
44 | static struct kobj_type au_sbi_ktype = { | |
45 | .release = au_si_free, | |
46 | .sysfs_ops = &au_sbi_ops, | |
47 | .default_attrs = sysaufs_si_attrs | |
48 | }; | |
49 | ||
50 | /* ---------------------------------------------------------------------- */ | |
51 | ||
52 | int sysaufs_si_init(struct au_sbinfo *sbinfo) | |
53 | { | |
54 | int err; | |
55 | ||
56 | sbinfo->si_kobj.kset = sysaufs_kset; | |
57 | /* cf. sysaufs_name() */ | |
58 | err = kobject_init_and_add | |
59 | (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL, | |
60 | SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo)); | |
61 | ||
62 | dbgaufs_si_null(sbinfo); | |
63 | if (!err) { | |
64 | err = dbgaufs_si_init(sbinfo); | |
65 | if (unlikely(err)) | |
66 | kobject_put(&sbinfo->si_kobj); | |
67 | } | |
68 | return err; | |
69 | } | |
70 | ||
71 | void sysaufs_fin(void) | |
72 | { | |
73 | dbgaufs_fin(); | |
74 | sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group); | |
75 | kset_unregister(sysaufs_kset); | |
76 | } | |
77 | ||
78 | int __init sysaufs_init(void) | |
79 | { | |
80 | int err; | |
81 | ||
82 | do { | |
83 | get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask)); | |
84 | } while (!sysaufs_si_mask); | |
85 | ||
86 | err = -EINVAL; | |
87 | sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj); | |
88 | if (unlikely(!sysaufs_kset)) | |
89 | goto out; | |
90 | err = PTR_ERR(sysaufs_kset); | |
91 | if (IS_ERR(sysaufs_kset)) | |
92 | goto out; | |
93 | err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group); | |
94 | if (unlikely(err)) { | |
95 | kset_unregister(sysaufs_kset); | |
96 | goto out; | |
97 | } | |
98 | ||
99 | err = dbgaufs_init(); | |
100 | if (unlikely(err)) | |
101 | sysaufs_fin(); | |
102 | out: | |
103 | return err; | |
104 | } |