From: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Date: Thu, 10 Dec 2009 23:52:16 +0000 (+0000)
Subject: dm: use md pending for in flight IO counting
X-Git-Tag: v2.6.33-rc1~75^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b4324feeae304ae39e631a254d238a7d63be004b;p=pandora-kernel.git

dm: use md pending for in flight IO counting

This patch changes the counter for the number of in_flight I/Os
to md->pending from q->in_flight in preparation for a later patch.
No functional change.

Request-based dm used q->in_flight to count the number of in-flight
clones assuming the counter is always incremented for an in-flight
original request and original:clone is 1:1 relationship.
However, it this no longer true for barrier requests.
So use md->pending to count the number of in-flight clones.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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