From: Maneesh Soni <maneesh@in.ibm.com>

o The following patch provides dumb helpers to access the corresponding
  kobject, attribute or binary attribute given a dentry and prepare the
  sysfs_file_operation methods for using sysfs_dirents.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>