From: Yan <yanzheng@21cn.com>
Date: Tue, 22 Jan 2008 17:46:56 +0000 (-0500)
Subject: Fix for btrfs_find_free_objectid
X-Git-Tag: v2.6.29-rc1~27^2~9^2~55^2~56^2~30^2~326
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b17854275cd297d40c6c5562fa44a472314c6c7f;p=pandora-kernel.git

Fix for btrfs_find_free_objectid

btrfs_find_free_objectid may return a used objectid due to arithmetic
underflow. This bug may happen when parameter 'root' is tree root,  so
it may cause serious problems when creating snapshot or sub-volume.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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