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
  18 static 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
  27 static 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
  42 int 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
  65 void 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
  83 EXPORT_SYMBOL_GPL(sysfs_create_group);
  84 EXPORT_SYMBOL_GPL(sysfs_remove_group);