On Thursday 29 January 2009 11:47:15 am Edward Tomasz Napierala wrote:
> Author: trasz
> Date: Thu Jan 29 16:47:15 2009
> New Revision: 187894
> URL: http://svn.freebsd.org/changeset/base/187894
> 
> Log:
>   Make sure the cdev doesn't go away while the filesystem is still mounted.
>   Otherwise dev2udev() could return garbage.
>   
>   Reviewed by:        kib
>   Approved by:        rwatson (mentor)
>   Sponsored by:       FreeBSD Foundation

Is this applicable to all filesystems?  I'm curious why the VREF() on the 
vnode associated with the cdev entry (um_devvp) is not sufficient to prevent 
this?  I would have thought that the vnode would have held a reference on the 
cdev.

-- 
John Baldwin
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