tree 371f8ceacc858232947632eedbdb9cf9f049a8d0
parent 0d10ee2e6deb5c8409ae65b970846344897d5e4e
author Chris Mason <chris.mason@oracle.com> 1312482516 -0400
committer Chris Mason <chris.mason@oracle.com> 1312566498 -0400

Btrfs: force unplugs when switching from high to regular priority bios

Btrfs does bio submissions from a worker thread, and each device
has a list of high priority bios and regular priority bios.

Synchronous writes go to the high priority thread while async writes
go to regular list.  This commit brings back an explicit unplug
any time we switch from high to regular priority, which makes it
easier for the block layer to give us low latencies.

Signed-off-by: Chris Mason <chris.mason@oracle.com>