/* * 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 "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(grp->name, kobj->dentry,				strlen(grp->name));	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);