linux-kernel - Re: [PATCH] virtio-blk: emit udev event when device is resized

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Date:	Mon, 25 Feb 2013 14:43:39 -0800
From:	Greg KH <greg@...ah.com>
To:	Kay Sievers <kay@...y.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Milos Vyletel <milos.vyletel@....cz>,
	linux-kernel@...r.kernel.org, linux-hotplug@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, mst@...hat.com
Subject: Re: [PATCH] virtio-blk: emit udev event when device is resized

On Mon, Feb 25, 2013 at 11:39:52PM +0100, Kay Sievers wrote:
> On Mon, Feb 25, 2013 at 11:12 PM, Greg KH <greg@...ah.com> wrote:
> 
> > Hm, I thought we were frowning apon running binaries from udev rules
> > these days, especially ones that might have big consequences (like
> > resizing a disk image) like this.
> >
> > Kay, am I right?
> 
> We removed most of them from the default setups, yes. But there is
> nothing wrong if people want to ship that in some package or as custom
> rules.
> 
> It looks fine to me, we would just not add such things to the default
> set of of rules these days.
> 
> > We already emit KOBJECT_CHANGE events when block devices change, from
> > within the block core code.  Why is the patch below needed instead of
> > using these events that are already generated?  How are virtio block
> > devices special?
> 
> I think we only do that for dm and md and a couple of special cases
> like loop and read-only settings.

What about when we repartition a block device?  I've seen the events
happen then.

Anyway, if you are ok with this, no objection from my side then Rusty.

thanks,

greg k-h
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