From: Stefan Behrens <sbehrens@giantdisaster.de>
Date: Thu, 14 Jun 2012 14:42:31 +0000 (+0200)
Subject: Btrfs: don't count I/O statistic read errors for missing devices
X-Git-Tag: v3.5-rc6~14^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=597a60fadedf9a40fdff8735054bf772b3dafd57;p=pandora-kernel.git

Btrfs: don't count I/O statistic read errors for missing devices

It is normal behaviour of the low level btrfs function btrfs_map_bio()
to complete a bio with -EIO if the device is missing, instead of just
preventing the bio creation in an earlier step.
This used to cause I/O statistic read error increments and annoying
printk_ratelimited messages. This commit fixes the issue.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Reported-by: Carey Underwood <cwillu@cwillu.com>
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