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Commit | Line | Data |
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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> | |
5f45f1a7 | 14 | #include <linux/namei.h> |
1da177e4 | 15 | #include <linux/err.h> |
b592fcfe | 16 | #include <linux/fs.h> |
94bebf4d | 17 | #include <asm/semaphore.h> |
1da177e4 LT |
18 | #include "sysfs.h" |
19 | ||
20 | ||
21 | static void remove_files(struct dentry * dir, | |
22 | const struct attribute_group * grp) | |
23 | { | |
24 | struct attribute *const* attr; | |
25 | ||
26 | for (attr = grp->attrs; *attr; attr++) | |
27 | sysfs_hash_and_remove(dir,(*attr)->name); | |
28 | } | |
29 | ||
30 | static int create_files(struct dentry * dir, | |
31 | const struct attribute_group * grp) | |
32 | { | |
33 | struct attribute *const* attr; | |
34 | int error = 0; | |
35 | ||
36 | for (attr = grp->attrs; *attr && !error; attr++) { | |
37 | error = sysfs_add_file(dir, *attr, SYSFS_KOBJ_ATTR); | |
38 | } | |
39 | if (error) | |
40 | remove_files(dir,grp); | |
41 | return error; | |
42 | } | |
43 | ||
44 | ||
45 | int sysfs_create_group(struct kobject * kobj, | |
46 | const struct attribute_group * grp) | |
47 | { | |
48 | struct dentry * dir; | |
49 | int error; | |
50 | ||
51 | BUG_ON(!kobj || !kobj->dentry); | |
52 | ||
53 | if (grp->name) { | |
54 | error = sysfs_create_subdir(kobj,grp->name,&dir); | |
55 | if (error) | |
56 | return error; | |
57 | } else | |
58 | dir = kobj->dentry; | |
59 | dir = dget(dir); | |
60 | if ((error = create_files(dir,grp))) { | |
61 | if (grp->name) | |
62 | sysfs_remove_subdir(dir); | |
63 | } | |
64 | dput(dir); | |
65 | return error; | |
66 | } | |
67 | ||
68 | void sysfs_remove_group(struct kobject * kobj, | |
69 | const struct attribute_group * grp) | |
70 | { | |
71 | struct dentry * dir; | |
72 | ||
057f6c01 JM |
73 | if (grp->name) { |
74 | dir = lookup_one_len_kern(grp->name, kobj->dentry, | |
5f45f1a7 | 75 | strlen(grp->name)); |
057f6c01 JM |
76 | BUG_ON(IS_ERR(dir)); |
77 | } | |
1da177e4 LT |
78 | else |
79 | dir = dget(kobj->dentry); | |
80 | ||
81 | remove_files(dir,grp); | |
82 | if (grp->name) | |
83 | sysfs_remove_subdir(dir); | |
84 | /* release the ref. taken in this routine */ | |
85 | dput(dir); | |
86 | } | |
87 | ||
88 | ||
89 | EXPORT_SYMBOL_GPL(sysfs_create_group); | |
90 | EXPORT_SYMBOL_GPL(sysfs_remove_group); |