linux-kernel - Re: [PATCH] sd: do not set changed flag on all unit attention conditions

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Date:	Tue, 17 Jul 2012 23:12:11 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Mike Christie <michaelc@...wisc.edu>
CC:	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] sd: do not set changed flag on all unit attention conditions

Il 17/07/2012 20:49, Mike Christie ha scritto:
> > Not sure if we are talking about the same thing.
> > 
> > So can virtio-scsi send a UA with asc/ascq that indicates the lun
> > changed size? Other drivers do this. I updated Hannes's patches the
> > other day to support UAs like those in userspace.
> > 
> > I just saw the code in the patch where virtio-scsi gets that event.
> Was not done. I meant I saw that patch where virtio-scsi gets that
> virtio_scsi_event and kicks of a rescan based off of that.

Yes, it sends both (event + UA).  Right now Linux ignores the UA, and I
wanted virtio-scsi to match real hardware as much as possible so I
copied what aacraid does.  The event also has the advantage over UA that
it the revalidate is done immediately, not the next time the unit is
accessed.

Paolo
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