linux-kernel - RE: [Xen-devel] [PATCH v3] xen-blkfront: dynamic configuration of per-vbd resources

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Message-ID: <32978d4e198f4359bc7878d8474b3078@AMSPEX02CL03.citrite.net>
Date:	Wed, 27 Jul 2016 09:29:08 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	Bob Liu <bob.liu@...cle.com>,
	Roger Pau Monne <roger.pau@...rix.com>
CC:	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Xen-devel] [PATCH v3] xen-blkfront: dynamic configuration of
	per-vbd resources

> -----Original Message-----
[snip]
> >
> > Also, I'm not sure this is correct, if blkfront sees the "Closing" state on
> > blkback it will try to close the frontend and destroy the block device (see
> > blkfront_closing), and this should be avoided. You should call
> > blkfront_resume as soon as you see the backend move to the Closed or
> Closing
> > states, without calling blkfront_closing.
> >
> 
> I didn't get how this can happen, backend state won't be changed to 'Closing'
> before blkfront_closing() is called.
> So I think current logic is fine.
> 

Backends can go to closing before frontends, when the PV device is being detached.

  Paul