From: Ilya Dryomov <idryomov@gmail.com>
Date: Tue, 12 Feb 2013 16:28:59 +0000 (+0000)
Subject: Btrfs: allow for selecting only completely empty chunks
X-Git-Tag: v3.9-rc1~17^2~29^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e39cea61c4ecb5774c08f3e30507fdd58c1cca9;p=pandora-kernel.git

Btrfs: allow for selecting only completely empty chunks

Enhance balance usage filter by making it possible to balance out only
completely empty chunks.  Today, usage filter properly acts on values
from 1 to 99 inclusive, usage=100 selects all chunks, and usage=0
selects no chunks.  This commit changes the usage=0 case: the new
meaning is to restripe only completely empty chunks and nothing else.

Suggested-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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