Re: 2.6.16-rc6-mm1 (NFS tree ... busy inodes ... relatively harmless)

[Neil Brown]

On Sunday March 12, akpm@xxxxxxxx wrote:
> 
> - The NFS tree is a bit sick - you may see the `busy inodes - self destruct
>   in five seconds" message when performing NFS unmounts.  It seems relatively
>   harmless.

I think the term is "mostly harmless" ... see the entry for "Earth" in
The Hitch-Hikers Guide To The Galaxy... :-)

I don't believe this is harmless at all, and I have an oops to prove
it - though it is with NFSv4 which is still EXPERIMENTAL.

I don't believe it is an NFS bug at all, but a VFS bug.  It happens
more with NFS because iput on nfs can be a lot slower due to the
required network activity, so the race is easier to hit.

See the 
      Fix shrink_dcache_parent() against shrink_dcache_memory() race
threads.

Of course there could be other bugs...

NeilBrown
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