Commit b7e94a16 authored May 22, 2012 by Jun'ichi Nomura Committed by James Bottomley May 23, 2012

[SCSI] Fix dm-multipath starvation when scsi host is busy

block congestion control doesn't have any concept of fairness across
multiple queues.  This means that if SCSI reports the host as busy in
the queue congestion control it can result in an unfair starvation
situation in dm-mp if there are multiple multipath devices on the same
host.  For example:
http://www.redhat.com/archives/dm-devel/2012-May/msg00123.html



The fix for this is to report only the sdev busy state (and ignore the
host busy state) in the block congestion control call back.
The host is still congested, but the SCSI subsystem will sort out the
congestion in a fair way because it knows the relation between the
queues and the host.

[jejb: fixed up trailing whitespace]
Reported-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Tested-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

parent 4886b1af

drivers/scsi/scsi_lib.c

+7 −4

Original line number	Diff line number	Diff line
		@@ -1378,16 +1378,19 @@ static int scsi_lld_busy(struct request_queue *q)
		{
		struct scsi_device *sdev = q->queuedata;
		struct Scsi_Host *shost;
		struct scsi_target *starget;

		if (!sdev)
		return 0;

		shost = sdev->host;
		starget = scsi_target(sdev);

		if (scsi_host_in_recovery(shost) \|\| scsi_host_is_busy(shost) \|\|
		scsi_target_is_busy(starget) \|\| scsi_device_is_busy(sdev))
		/*
		* Ignore host/starget busy state.
		* Since block layer does not have a concept of fairness across
		* multiple queues, congestion of host/starget needs to be handled
		* in SCSI layer.
		*/
		if (scsi_host_in_recovery(shost) \|\| scsi_device_is_busy(sdev))
		return 1;

		return 0;

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