tree baed843e078e80d04ff28054751dea22e98bea0b
parent 8c9c2bf7a3c4f7e9d158c0be9c49f372fb943ad2
author Arne Jansen <sensille@gmx.net> 1330157387 +0100
committer David Sterba <dsterba@suse.cz> 1334769164 +0200

btrfs: don't add both copies of DUP to reada extent tree

Normally when there are 2 copies of a block, we add both to the
reada extent tree and prefetch only the one that is easier to reach.
This way we can better utilize multiple devices.
In case of DUP this makes no sense as both copies reside on the
same device.

Signed-off-by: Arne Jansen <sensille@gmx.net>