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/*
* fs/sysfs/group.c - Operations for adding/removing multiple files at once.
*
* Copyright (c) 2003 Patrick Mochel
* Copyright (c) 2003 Open Source Development Lab
*
* This file is released undert the GPL v2.
*
*/
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <asm/semaphore.h>
#include "sysfs.h"
static void remove_files(struct dentry * dir,
const struct attribute_group * grp)
{
struct attribute *const* attr;
for (attr = grp->attrs; *attr; attr++)
sysfs_hash_and_remove(dir,(*attr)->name);
}
static int create_files(struct dentry * dir,
const struct attribute_group * grp)
{
struct attribute *const* attr;
int error = 0;
for (attr = grp->attrs; *attr && !error; attr++) {
error = sysfs_add_file(dir, *attr, SYSFS_KOBJ_ATTR);
}
if (error)
remove_files(dir,grp);
return error;
}
int sysfs_create_group(struct kobject * kobj,
const struct attribute_group * grp)
{
struct dentry * dir;
int error;
BUG_ON(!kobj || !kobj->dentry);
if (grp->name) {
error = sysfs_create_subdir(kobj,grp->name,&dir);
if (error)
return error;
} else
dir = kobj->dentry;
dir = dget(dir);
if ((error = create_files(dir,grp))) {
if (grp->name)
sysfs_remove_subdir(dir);
}
dput(dir);
return error;
}
void sysfs_remove_group(struct kobject * kobj,
const struct attribute_group * grp)
{
struct dentry * dir;
if (grp->name) {
dir = lookup_one_len_kern(grp->name, kobj->dentry,
strlen(grp->name));
BUG_ON(IS_ERR(dir));
}
else
dir = dget(kobj->dentry);
remove_files(dir,grp);
if (grp->name)
sysfs_remove_subdir(dir);
/* release the ref. taken in this routine */
dput(dir);
}
EXPORT_SYMBOL_GPL(sysfs_create_group);
EXPORT_SYMBOL_GPL(sysfs_remove_group);
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