tree 27675574e1f79775a5ab03f84e27b81266be4e21
parent 3972f2603d8570effaf633cea52b12c7c2773c11
author Ilya Dryomov <idryomov@gmail.com> 1358690277 +0200
committer Ilya Dryomov <idryomov@gmail.com> 1358691677 +0200

Btrfs: bring back balance pause/resume logic

Balance pause/resume logic got broken by 5ac00add (went in into 3.8-rc1
as part of dev-replace merge).  Offending commit took a stab at making
mutually exclusive volume operations (add_dev, rm_dev, resize, balance,
replace_dev) not block behind volume_mutex if another such operation is
in progress and instead return an error right away.  Balancing front-end
relied on the blocking behaviour, so the fix is ugly, but short of a
complete rework, it's the best we can do.

Reported-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>