tree 64287747fdbb1641052d8ec146c8997c3797bc48
parent e293e97e363e419d8a3628a927321e3f75206a0b
author Chris Mason <chris.mason@oracle.com> 1232125099 -0500
committer Chris Mason <chris.mason@oracle.com> 1232125099 -0500

Btrfs: Clear the device->running_pending flag before bailing on congestion

Btrfs maintains a queue of async bio submissions so the checksumming
threads don't have to wait on get_request_wait.  In order to avoid
extra wakeups, this code has a running_pending flag that is used
to tell new submissions they don't need to wake the thread.

When the threads notice congestion on a single device, they
may decide to requeue the job and move on to other devices.  This
makes sure the running_pending flag is cleared before the
job is requeued.

It should help avoid IO stalls by making sure the task is woken up
when new submissions come in.

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