tree 12495362c9301129912a8d706de0f6cdb7de8ccf
parent 9f518b27cf682dd5155a4c1679d52cd4b5be82f2
author Kiyoshi Ueda <k-ueda@ct.jp.nec.com> 1260489136 +0000
committer Alasdair G Kergon <agk@redhat.com> 1260489136 +0000

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>