From 3d136a1131c66f7d26fb171e4c5b0b8baacd3129 Mon Sep 17 00:00:00 2001
From: Stefan Behrens <sbehrens@giantdisaster.de>
Date: Fri, 3 Feb 2012 11:20:04 +0100
Subject: [PATCH] Btrfs: set ioprio of scrub readahead to idle

Reduce ioprio class of scrub readahead threads to idle priority.
This setting is fixed. This priority has shown the best performance
during all measurements.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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