Re: umount fails with device busy

[Zoot <z00t@gmx.net>]

On Thu, Aug 23, 2007 at 04:35:28PM -0400, Chuck Lever wrote:
> >>>When I run umount during these ops I get an device busy. Any help 
> >>>would be very appreciated!
> >>
> >>This is normal and expected behavior.  One problem may be that your 
> >>server is slow, and thus there are RPCs left outstanding for a bit on 
> >>your client after your application exits.  The COMMIT calls from that 
> >>trace suggest that there is dirty data the client is writing back to 
> >>the server. 
> >
> >It seems to me that this should not be the expected behavior unless
> >the file system is mounted "nocto".  Is it?
> 
> I'm a little puzzled myself about what dirty data there might be left 
> after the application quits.  However, I'll be there is an mmap() 
> lurking somewhere in the background...
> 
> Data that was dirtied via a mapped file is not subject to the writeback 
> part of close-to-open.
At least according to the NFS debug output are the commits only related
to .trc files which are used by the app to store it's debug output. Not
used for mmap.

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