Re: kern/28448 (stackable filesystems locking breakage when looking up DOTDOT)

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

The following reply was made to PR kern/28448; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: YAMAMOTO Takashi <yamt%mwd.biglobe.ne.jp@localhost>
Cc: dholland-bugs%netbsd.org@localhost, gnats-bugs%NetBSD.org@localhost,
        kern-bug-people%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
        gnats-admin%netbsd.org@localhost, pooka%NetBSD.org@localhost
Subject: Re: kern/28448 (stackable filesystems locking breakage when
        looking up DOTDOT)
Date: Sun, 4 Jan 2009 01:18:26 +0000

 On Sat, Jan 03, 2009 at 02:32:13PM +0900, YAMAMOTO Takashi wrote:
  > locks can be shared only when the lower vnode exports them
  > for the upper layer.  ie. a layered filesystem can't assume that
  > it can share locks.
 
 That sounds like a problem... I'll keep it in mind.
 
  > > (although note that I'm planning to abolish the dotdot-dance)
  > 
  > good to hear.  thanks for working on it.
  > how will you do so?
 
 See http://mail-index.netbsd.org/tech-kern/2008/03/19/msg000653.html
 and following.
 
 (Which are turning out to be much longer-range plans than I'd
 intended... but that's another story.)
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost