From: Yan, Zheng <zheng.yan@oracle.com>
Date: Fri, 9 Oct 2009 13:25:16 +0000 (-0400)
Subject: Btrfs: optimize back reference update during btrfs_drop_snapshot
X-Git-Tag: v2.6.32-rc4~7^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=94fcca9f8999e7828d5f4dc181daa39cad2af38a;p=pandora-kernel.git

Btrfs: optimize back reference update during btrfs_drop_snapshot

This patch reading level 0 tree blocks that already use full backrefs.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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