From: Wouter Verhelst <w@uter.be>
To: Markus Pargmann <mpa@pengutronix.de>
Cc: nbd-general <nbd-general@lists.sourceforge.net>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] nbd: Issue a uevent when disconnecting
Date: Fri, 5 Feb 2016 10:42:41 +0100 [thread overview]
Message-ID: <20160205094241.GC6366@grep.be> (raw)
In-Reply-To: <5247002.OuBHJMaBYj@adelgunde>
Hi Markus,
On Fri, Feb 05, 2016 at 10:03:41AM +0100, Markus Pargmann wrote:
> Hi Wouter,
>
> On Tuesday, February 02, 2016 04:27:00 PM Wouter Verhelst wrote:
> > There already is a uevent by default when closing a device upon connect
> > of the device. However, the same isn't true on disconnect.
> >
> > This makes it hard for userspace to keep track of whether a device is
> > connected, since we are notified when the connection is created, but not
> > when it is removed again.
> >
> > Explicitly issue a "change" uevent to remedy.
> >
> > [v2: incorporate feedback from udev maintainer and make sure that we
> > issue a uevent upon connect as well as disconnect, rather than connect
> > only]
>
> The systemd people had the same feedback.
Well, the systemd people and the udev people are the same people these
days :-)
> Basically the device is not marked as ready until a uevent is received. My
> idea was to use the size property consistently. If the device is connected
> the size is correctly changed and a uevent is created. On disconnect the size
> is set to 0 with another uevent.
>
> Does this work for you as well? I will send the patch as reply.
Sure. What matters most is that the uevent is done; how it's done, less
so.
I should add that this was meant to go with systemd #2422. I wasn't
aware of #358, or I would've talked to you more :-)
--
It is easy to love a country that is famous for chocolate and beer
-- Barack Obama, speaking in Brussels, Belgium, 2014-03-26
next prev parent reply other threads:[~2016-02-05 9:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-23 16:23 [PATCH] Issue a uevent when disconnecting Wouter Verhelst
2016-02-02 15:27 ` [PATCH v2] nbd: " Wouter Verhelst
2016-02-05 9:03 ` Markus Pargmann
2016-02-05 9:42 ` Wouter Verhelst [this message]
2016-02-12 14:49 ` Markus Pargmann
2016-02-05 9:04 ` [PATCH] nbd: Create size change events for userspace Markus Pargmann
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