tree ff697d01a6dd8cf50b37b3855e40764335be044d
parent 0940ebf6b92ea10a6f30ae5ac3993a3b75745da6
author Ilya Dryomov <idryomov@gmail.com> 1326744288 +0200
committer Ilya Dryomov <idryomov@gmail.com> 1326744288 +0200

Btrfs: recover balance on mount

On mount, if balance item is found, resume balance in a separate
kernel thread.

Try to be smart to continue roughly where previous balance (or convert)
was interrupted.  For chunk types that were being converted to some
profile we turn on soft convert, in case of a simple balance we turn on
usage filter and relocate only less-than-90%-full chunks of that type.
These are just heuristics but they help quite a bit, and can be improved
in future.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>