btrfs: test power failure while qgroups rescan is in progress
Test that if a power failure happens on a filesystem with quotas
(qgroups) enabled while the quota rescan kernel thread is running,
we will be able to mount the filesystem after the power failure.
This test is motivated by a recent regression introduced in the
linux kernel's 4.18 merge window and is fixed by a patch with the
title:
"Btrfs: fix mount failure when qgroup rescan is in progress"
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>