Documentation/block/capability.txt

   1 Generic Block Device Capability
   2 ===============================================================================
   3 This file documents the sysfs file block/<disk>/capability
   4
   5 capability is a hex word indicating which capabilities a specific disk
   6 supports.  For more information on bits not listed here, see
   7 include/linux/genhd.h
   8
   9 Capability                              Value
  10 -------------------------------------------------------------------------------
  11 GENHD_FL_MEDIA_CHANGE_NOTIFY            4
  12         When this bit is set, the disk supports Asynchronous Notification
  13         of media change events.  These events will be broadcast to user
  14         space via kernel uevent.
  15