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Re: kern/41189: kernel panic xen dom0 using mke2fs & WAPBL

The following reply was made to PR kern/41189; it has been noted by GNATS.

From: David Holland <>
To: Andrew Doran <>
Subject: Re: kern/41189: kernel panic xen dom0 using mke2fs & WAPBL
Date: Wed, 6 May 2009 23:22:03 +0000

 On Mon, May 04, 2009 at 11:05:08PM +0000, Andrew Doran wrote:
  > >  Realistically devfs won't change the real problem (confusing whether
  > >  um_devvp belongs to the fs mounted on it or the fs it sits on) but
  > >  just replace wapbl-related issues with comparable devfs-related
  > >  issues.
  > >  
  > >  The real fix is [...]
  > I disagree. I think the solution is:
  > - devfs
  > - kill block devices in userspace
  > - allow unaligned I/O to disk devices via the raw node
 How/why? As I've already explained once (mostly quoted above), devfs
 will not solve the real problem, just move it around. What are you
 envisioning that devfs will provide that will avoid the confusion?
 And while unaligned I/O seems like a fine idea (as long as it doesn't
 make physio slower) I don't see how it's relevant.
 Please *explain* your reasoning.
 David A. Holland

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