xref: /openbmc/linux/fs/sysfs/group.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 
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 
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 
89 EXPORT_SYMBOL_GPL(sysfs_create_group);
90 EXPORT_SYMBOL_GPL(sysfs_remove_group);
91