tree a5290cc4e69c434b24c091a212d1723bae56e46c
parent a2bff64025d7a707ac49155bb6678a636e55096e
author Stefan Behrens <sbehrens@giantdisaster.de> 1352134448 +0100
committer Josef Bacik <jbacik@fusionio.com> 1355350538 -0500

Btrfs: disallow mutually exclusive admin operations from user mode

Btrfs admin operations that are manually started from user mode
and that cannot be executed at the same time return -EINPROGRESS.
A common way to enter and leave this locked section is introduced
since it used to be specific to the balance operation.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>