From: Arne Jansen <sensille@gmx.net>
Date: Fri, 10 Jun 2011 11:55:54 +0000 (+0200)
Subject: btrfs: hooks for readahead
X-Git-Tag: v3.2-rc1~21^2~9^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4bb31e92;p=pandora-kernel.git

btrfs: hooks for readahead

This adds the hooks needed for readahead. In the readpage_end_io_hook,
the extent state is checked for the EXTENT_READAHEAD flag. Only in this
case the readahead hook is called, to keep the impact on non-ra as low
as possible.
Additionally, a hook for a failed IO is added, otherwise readahead would
wait indefinitely for the extent to finish.

Changes for v2:
 - eliminate race condition

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