LXR linux-bk/fs/sysfs/group.c

   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/err.h>
  15#include "sysfs.h"
  16
  17
  18static void remove_files(struct dentry * dir, 
  19                         const struct attribute_group * grp)
  20{
  21        struct attribute *const* attr;
  22
  23        for (attr = grp->attrs; *attr; attr++)
  24                sysfs_hash_and_remove(dir,(*attr)->name);
  25}
  26
  27static int create_files(struct dentry * dir,
  28                        const struct attribute_group * grp)
  29{
  30        struct attribute *const* attr;
  31        int error = 0;
  32
  33        for (attr = grp->attrs; *attr && !error; attr++) {
  34                error = sysfs_add_file(dir, *attr, SYSFS_KOBJ_ATTR);
  35        }
  36        if (error)
  37                remove_files(dir,grp);
  38        return error;
  39}
  40
  41
  42int sysfs_create_group(struct kobject * kobj, 
  43                       const struct attribute_group * grp)
  44{
  45        struct dentry * dir;
  46        int error;
  47
  48        BUG_ON(!kobj || !kobj->dentry);
  49
  50        if (grp->name) {
  51                error = sysfs_create_subdir(kobj,grp->name,&dir);
  52                if (error)
  53                        return error;
  54        } else
  55                dir = kobj->dentry;
  56        dir = dget(dir);
  57        if ((error = create_files(dir,grp))) {
  58                if (grp->name)
  59                        sysfs_remove_subdir(dir);
  60        }
  61        dput(dir);
  62        return error;
  63}
  64
  65void sysfs_remove_group(struct kobject * kobj, 
  66                        const struct attribute_group * grp)
  67{
  68        struct dentry * dir;
  69
  70        if (grp->name)
  71                dir = sysfs_get_dentry(kobj->dentry,grp->name);
  72        else
  73                dir = dget(kobj->dentry);
  74
  75        remove_files(dir,grp);
  76        if (grp->name)
  77                sysfs_remove_subdir(dir);
  78        /* release the ref. taken in this routine */
  79        dput(dir);
  80}
  81
  82
  83EXPORT_SYMBOL_GPL(sysfs_create_group);
  84EXPORT_SYMBOL_GPL(sysfs_remove_group);
  85