id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	field_blocks	field_dependson	field_seealso
217	Need a way to detach devices	Jakub Jermář		"Commands like:

- ata_bd
- mbr_part
- file_bd

create new dev_handles and also nodes under /dev.

There is currently no graceful way to release these resources so the associated dev_handles and nodes will exist in the system until reboot or until the respective server dies.

When implementing support for device detaching, care must be taken not to detach a device which is being currently used. This can be achieved by adding a reference when it is being used (e.g. on mount).

It would also be useful to be able to list what devices belong to what services, e.g.:

{{{
# devadm list
dev_handle driver   node
========== =======  =============================
1          rd       bd/initrd
3          -        null0
4          ata_bd   bd/disk0
5          mbr_part bd/disk0p0
6          mbr_part bd/disk0p1
7          mbr_part bd/disk0p2
8          mbr_part bd/disk0p3
9          file_bd  bd/fbdev0

# devadm list mbr_part
dev_handle driver   node
========== =======  =============================
5          mbr_part bd/disk0p0
6          mbr_part bd/disk0p1
7          mbr_part bd/disk0p2
8          mbr_part bd/disk0p3

# devadm detach bd/disk0p0
bd/disk0p0 cannot be detached because it is being used.
# devadm detach bd/disk0p1

# devadm list mbr_part
dev_handle driver   node
========== =======  =============================
5          mbr_part bd/disk0p0
7          mbr_part bd/disk0p2
8          mbr_part bd/disk0p3
}}}"	enhancement	closed	major		helenos/srv/locsrv	mainline	invalid					#215, #449