* kernel: add device_type = "fb", "fbcon" to class "graphics"
+* readahead: use BTRFS_IOC_DEFRAG_RANGE instead of BTRFS_IOC_DEFRAG ioctl, with START_IO
+
+* readahead: check whether a btrfs volume includes ssd by checking mount flag "ssd"
+
* hostnamed: make file updates atomic
* support sd_notify() style notificatio when reload is finished (RELOADED=1)