linux-kernel - Re: [Xen-devel] [PATCH] xen-blkfront: emit KOBJ

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Date:   Wed, 5 Jul 2017 14:37:15 +0200
From:   Vincent Legout <vincent.legout@...di.net>
To:     Jan Beulich <JBeulich@...e.com>
Cc:     Roger Pau Monné <roger.pau@...rix.com>,
        xen-devel@...ts.xenproject.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH] xen-blkfront: emit KOBJ_OFFLINE uevent when
 detaching device

On Wed, Jul 05, 2017 at 02:17:24AM -0600, Jan Beulich wrote :
> >>> On 05.07.17 at 10:08, <vincent.legout@...di.net> wrote:
> > Without the patch, blkif_release and xlvbd_release_gendisk are never
> > called, and no call to blk_unregister_queue is made.
> 
> But isn't that what needs to be fixed then? The device should be
> removed once its last user goes away (which would be at the time
> the umount is eventually done aiui).

You mean that block-detach should fail if the device is still mounted?
or find a way to wait until all the users are gone?

I don't say that's not what should be done, but that's not what I get.
The device is removed after a block-detach, even if still mounted. So
the system is left in an unstable state without the patch.

I also just saw the --force option of xl block-detach, but from a quick
look it seems this option was actually only in xm and never in xl.

Vincent