use submit_bio_wait() instead of original struct.
io: bit fixes.
redo: remove an unused header.
alldevs: make things simple.
remove hashtbl.
move treemap test code.
alldevs: a bit refactor.
control: we should check goten minor id.
change log level of several logs.
remove unused headers inclusion.
update README.
io: a bit fix of log level.
doc: update.
fix: treemap: make arguments of several functions const.
update README.
use idr instead list for alldevs.