Re: Replace lockmgr for vnodes

[David Holland <dholland-tech%netbsd.org@localhost>]

On Sat, Jan 26, 2008 at 05:57:50PM +0000, Andrew Doran wrote:
 >> 4) I think we can rip out the "UPPER LOCK" stuff in layerfs. It dated from 
 >> when lower file systems didn't do locking. The only thing now that doesn't 
 >> export a vn_lock is unionfs, which does do correct locking. Sorry, I've 
 >> been meaning to kill it but haven't gotten to it.
 > 
 > Sounds like union-over-union should be prevented? I'll see about removing
 > it.

It seems like if unionfs does proper locking, it ought to be able to
take unions of anything, including other unionfses.

Am I missing something?

-- 
David A. Holland
dholland%netbsd.org@localhost