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Date: Mon, 27 May 2013 01:21:55 +0000
From: Steve Wills <swills@FreeBSD.org>
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To: fs@FreeBSD.org
Subject: Re: dev entries for cloned zvol don't show up until after reboot
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On 05/24/13 17:56, Steve Wills wrote:
> Hi,
> 
> I've noticed that if I make zvol, create a snapshot of it, then clone
> that, the /dev/zvol/* entries for it don't show up until after I reboot.
> This is on r250925. Is this a known bug?

To add a bit more detail to this, the steps are:

zfs create -V 1G pool/somevol
ls /dev/zvol/pool # witness somevol entries
zfs create pool/somevol@somesnap
ls /dev/zvol/pool # witness no new entries
zfs clone pool/somvol@somesnap pool/anothervol
ls /dev/zvol/pool # again witness no new entries
reboot
ls /dev/zvol/pool # witness missing entries appearing

I'll go ahead and submit a PR too in case that helps.

Steve