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

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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>

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Arne Jansen 2012-02-25 09:09:47 +01:00 • committed by David Sterba

parent 8c9c2bf7a3

commit 207a232cca

1 changed files with 13 additions and 0 deletions

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fs/btrfs/reada.c

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