From: Joe Thornber <ejt@redhat.com>
Date: Mon, 6 Oct 2014 14:28:30 +0000 (+0100)
Subject: dm thin: prefetch missing metadata pages
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~22^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a01a6af75f839ff8eb25dab69b49224e855bfa1;p=pandora-kernel.git

dm thin: prefetch missing metadata pages

Prefetch metadata at the start of the worker thread and then again every
128th bio processed from the deferred list.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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