On 08/22/2011 04:45 PM, Christoph Hellwig wrote:
On Mon, Aug 22, 2011 at 03:35:43PM +0200, Hannes Reinecke wrote:
Starting multipath on a cciss device will cause a kernel
warning to be triggered. Problem is that we're using the
->queuedata field of the request_queue to dereference the
scsi device; however, for other (non-SCSI) devices this
points to a totally different structure.
So we should rather be using accessors here to make
sure ->queuedata points to a valid sdev.
How do we match to attach a scsi device handler to a non-scsi queue?
I suspect that is the fundamental issue that needs addressing.
We don't. SCSI device handler are only for SCSI devices, not block
devices. But scsi_dh_attach() and scsi_dh_detach() is called from
dm-mpath.c:parse_path(), and this doesn't have any idea about the
underlying device type.
Cheers,
Hannes
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Dr. Hannes Reinecke zSeries & Storage
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