From: Tejun Heo <tj@kernel.org>
Date: Fri, 28 Nov 2008 04:32:04 +0000 (+0900)
Subject: block: make every barrier action optional
X-Git-Tag: v2.6.29-rc1~569^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f671620e7d895af221bdfeda751d54fa55ed9546;p=pandora-kernel.git

block: make every barrier action optional

In all barrier sequences, the barrier write itself was always assumed
to be issued and thus didn't have corresponding control flag.  This
patch adds QUEUE_ORDERED_DO_BAR and unify action mask handling in
start_ordered() such that any barrier action can be skipped.

This patch doesn't introduce any visible behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

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