From: Tejun Heo <tj@kernel.org>
Date: Thu, 13 Jan 2011 19:59:59 +0000 (+0000)
Subject: dm snapshot: persistent make metadata_wq multithreaded
X-Git-Tag: v2.6.38-rc1~221^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=239c8dd533e74de4a7f3c85c4f9f430eb08867c1;p=pandora-kernel.git

dm snapshot: persistent make metadata_wq multithreaded

metadata_wq serves on-stack work items from chunk_io().  Even if
multiple chunk_io() are simultaneously in progress, each is
independent and queued only once, so multithreaded workqueue can be
safely used.

Switch metadata_wq to multithread and flush the work item instead of
the workqueue in chunk_io().

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

Reading git-diff-tree failed