text: /*
   * 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 sysfs_dirent *dir_sd,
  			 const struct attribute_group *grp)
  {
  	struct attribute *const* attr;
  
  	for (attr = grp->attrs; *attr; attr++)
  		sysfs_hash_and_remove(dir_sd, (*attr)->name);
  }
  
  static int create_files(struct sysfs_dirent *dir_sd,
  			const struct attribute_group *grp)
  {
  	struct attribute *const* attr;
  	int error = 0;
  
  	for (attr = grp->attrs; *attr && !error; attr++)
  		error = sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
  	if (error)
  		remove_files(dir_sd, grp);
  	return error;
  }
  
  
  int sysfs_create_group(struct kobject * kobj, 
  		       const struct attribute_group * grp)
  {
  	struct sysfs_dirent *sd;
  	int error;
  
  	BUG_ON(!kobj || !kobj->sd);
  
  	if (grp->name) {
  		error = sysfs_create_subdir(kobj, grp->name, &sd);
  		if (error)
  			return error;
  	} else
  		sd = kobj->sd;
  	sysfs_get(sd);
  	error = create_files(sd, grp);
  	if (error) {
  		if (grp->name)
  			sysfs_remove_subdir(sd);
  	}
  	sysfs_put(sd);
  	return error;
  }
  
  void sysfs_remove_group(struct kobject * kobj, 
  			const struct attribute_group * grp)
  {
  	struct sysfs_dirent *dir_sd = kobj->sd;
  	struct sysfs_dirent *sd;
  
  	if (grp->name) {
  		sd = sysfs_get_dirent(dir_sd, grp->name);
  		BUG_ON(!sd);
  	} else
  		sd = sysfs_get(dir_sd);
  
  	remove_files(sd, grp);
  	if (grp->name)
  		sysfs_remove_subdir(sd);
  
  	sysfs_put(sd);
  }
  
  
  EXPORT_SYMBOL_GPL(sysfs_create_group);
  EXPORT_SYMBOL_GPL(sysfs_remove_group);
  