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1da177e4 LT |
1 | /* |
2 | * fs/sysfs/group.c - Operations for adding/removing multiple files at once. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released undert the GPL v2. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/kobject.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/dcache.h> | |
14 | #include <linux/err.h> | |
15 | #include "sysfs.h" | |
16 | ||
17 | ||
18 | static void remove_files(struct dentry * dir, | |
19 | const struct attribute_group * grp) | |
20 | { | |
21 | struct attribute *const* attr; | |
22 | ||
23 | for (attr = grp->attrs; *attr; attr++) | |
24 | sysfs_hash_and_remove(dir,(*attr)->name); | |
25 | } | |
26 | ||
27 | static int create_files(struct dentry * dir, | |
28 | const struct attribute_group * grp) | |
29 | { | |
30 | struct attribute *const* attr; | |
31 | int error = 0; | |
32 | ||
33 | for (attr = grp->attrs; *attr && !error; attr++) { | |
34 | error = sysfs_add_file(dir, *attr, SYSFS_KOBJ_ATTR); | |
35 | } | |
36 | if (error) | |
37 | remove_files(dir,grp); | |
38 | return error; | |
39 | } | |
40 | ||
41 | ||
42 | int sysfs_create_group(struct kobject * kobj, | |
43 | const struct attribute_group * grp) | |
44 | { | |
45 | struct dentry * dir; | |
46 | int error; | |
47 | ||
48 | BUG_ON(!kobj || !kobj->dentry); | |
49 | ||
50 | if (grp->name) { | |
51 | error = sysfs_create_subdir(kobj,grp->name,&dir); | |
52 | if (error) | |
53 | return error; | |
54 | } else | |
55 | dir = kobj->dentry; | |
56 | dir = dget(dir); | |
57 | if ((error = create_files(dir,grp))) { | |
58 | if (grp->name) | |
59 | sysfs_remove_subdir(dir); | |
60 | } | |
61 | dput(dir); | |
62 | return error; | |
63 | } | |
64 | ||
65 | void sysfs_remove_group(struct kobject * kobj, | |
66 | const struct attribute_group * grp) | |
67 | { | |
68 | struct dentry * dir; | |
69 | ||
70 | if (grp->name) | |
71 | dir = sysfs_get_dentry(kobj->dentry,grp->name); | |
72 | else | |
73 | dir = dget(kobj->dentry); | |
74 | ||
75 | remove_files(dir,grp); | |
76 | if (grp->name) | |
77 | sysfs_remove_subdir(dir); | |
78 | /* release the ref. taken in this routine */ | |
79 | dput(dir); | |
80 | } | |
81 | ||
82 | ||
83 | EXPORT_SYMBOL_GPL(sysfs_create_group); | |
84 | EXPORT_SYMBOL_GPL(sysfs_remove_group); |