tree 644af58ba64f8cb431d01abaff81113b4ed6a835
parent ea25da48086d3bbebf3a2eeff387ea00ed96f5c4
author Jan Kara <jack@suse.cz> 1492594407 +0200
committer Jens Axboe <axboe@fb.com> 1492613343 -0600

block: Make writeback throttling defaults consistent for SQ devices

When CFQ is used as an elevator, it disables writeback throttling
because they don't play well together. Later when a different elevator
is chosen for the device, writeback throttling doesn't get enabled
again as it should. Make sure CFQ enables writeback throttling (if it
should be enabled by default) when we switch from it to another IO
scheduler.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>