Btrfs: optimize back reference update during btrfs_drop_snapshot
authorYan, Zheng <zheng.yan@oracle.com>
Fri, 9 Oct 2009 13:25:16 +0000 (09:25 -0400)
committerChris Mason <chris.mason@oracle.com>
Fri, 9 Oct 2009 13:25:16 +0000 (09:25 -0400)
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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