tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/namei.h>
15#include <linux/err.h>
16#include "sysfs.h"
17
18
19static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
20 const struct attribute_group *grp)
21{
22 struct attribute *const* attr;
23 int i;
24
25 for (i = 0, attr = grp->attrs; *attr; i++, attr++)
26 if (!grp->is_visible ||
27 grp->is_visible(kobj, *attr, i))
28 sysfs_hash_and_remove(dir_sd, (*attr)->name);
29}
30
31static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
32 const struct attribute_group *grp)
33{
34 struct attribute *const* attr;
35 int error = 0, i;
36
37 for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++)
38 if (!grp->is_visible ||
39 grp->is_visible(kobj, *attr, i))
40 error |=
41 sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
42 if (error)
43 remove_files(dir_sd, kobj, grp);
44 return error;
45}
46
47
48int sysfs_create_group(struct kobject * kobj,
49 const struct attribute_group * grp)
50{
51 struct sysfs_dirent *sd;
52 int error;
53
54 BUG_ON(!kobj || !kobj->sd);
55
56 if (grp->name) {
57 error = sysfs_create_subdir(kobj, grp->name, &sd);
58 if (error)
59 return error;
60 } else
61 sd = kobj->sd;
62 sysfs_get(sd);
63 error = create_files(sd, kobj, grp);
64 if (error) {
65 if (grp->name)
66 sysfs_remove_subdir(sd);
67 }
68 sysfs_put(sd);
69 return error;
70}
71
72void sysfs_remove_group(struct kobject * kobj,
73 const struct attribute_group * grp)
74{
75 struct sysfs_dirent *dir_sd = kobj->sd;
76 struct sysfs_dirent *sd;
77
78 if (grp->name) {
79 sd = sysfs_get_dirent(dir_sd, grp->name);
80 if (!sd) {
81 printk(KERN_WARNING "sysfs group %p not found for "
82 "kobject '%s'\n", grp, kobject_name(kobj));
83 WARN_ON(!sd);
84 return;
85 }
86 } else
87 sd = sysfs_get(dir_sd);
88
89 remove_files(sd, kobj, grp);
90 if (grp->name)
91 sysfs_remove_subdir(sd);
92
93 sysfs_put(sd);
94}
95
96
97EXPORT_SYMBOL_GPL(sysfs_create_group);
98EXPORT_SYMBOL_GPL(sysfs_remove_group);