usb/140477: [umass] [patch] allow boot-time attachment of daX devices to GEOM_ELI

[Bjoern A. Zeeb]

The following reply was made to PR usb/140477; it has been noted by GNATS.

From: "Bjoern A. Zeeb" <bzeeb-lists at lists.zabbadoz.net>
To: Eygene Ryabinkin <rea-fbsd at codelabs.ru>
Cc: bug-followup at FreeBSD.org
Subject: Re: usb/140477: [umass] [patch] allow boot-time attachment of daX
 devices to GEOM_ELI
Date: Thu, 12 Nov 2009 10:43:56 +0000 (UTC)

 On Thu, 12 Nov 2009, Eygene Ryabinkin wrote:
 
 Hi,
 
 > Bjoern, good day.
 >
 > Thu, Nov 12, 2009 at 07:28:03AM +0000, Bjoern A. Zeeb wrote:
 >> has this changed recently, that it no longer works?  I seem to
 >> remember that it had perfectly worked before this year.
 >
 > Yes, it used to work with up to 7.<anything>.  But it seems that with
 > the new USB stack we have asynchronous discovery and attachment, so
 > other subsystems are started when this process isn't yet fully
 > completed, so root mount is getting "closer" and, for my case, root
 > mount typically waits only for the completion of USB tasks.
 >
 > My gut feeling is that the device discovery prior to the USBv2 was
 > done synchronously, but with USBv2 kernel use async callbacks.  Though,
 > I may be wrong in this judgement.
 >
 > You can try it yourself -- plugged USB stick with geli volume that is
 > marked as attach-on-boot should show the current behaviour.
 
 I am doing that regularly, on HEAD (last updated in October). But I
 see I lacked coffee this morning, wanted to say "earlier this year".
 
 -- 
 Bjoern A. Zeeb         It will not break if you know what you are doing.