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 <linux/fs.h>
17#include <asm/semaphore.h>
18#include "sysfs.h"
19
20
21static 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
30static 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
45int 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
68void sysfs_remove_group(struct kobject * kobj,
69			const struct attribute_group * grp)
70{
71	struct dentry * dir;
72
73	if (grp->name) {
74		dir = lookup_one_len_kern(grp->name, kobj->dentry,
75				strlen(grp->name));
76		BUG_ON(IS_ERR(dir));
77	}
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
89EXPORT_SYMBOL_GPL(sysfs_create_group);
90EXPORT_SYMBOL_GPL(sysfs_remove_group);
91