Btrfs: don't lookup csums for prealloc extents

The tree logging stuff was looking up csums to copy over for prealloc
extents which is just work we don't need to be doing.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2012-09-26 11:07:06 -04:00 • committed by Chris Mason
commit 6f1fed7753