From: "Lever, Charles" <Charles.Lever@netapp.com>
Subject: RE: NFS problem - close to open cache consistency broken ?
Date: Thu, 15 Sep 2005 06:50:49 -0700
Message-ID: <044B81DE141D7443BCE91E8F44B3C1E288E451@exsvl02.hq.netapp.com>
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Cc: <nfs@lists.sourceforge.net>
To: "Thomas Stockheim" <tommi@bub-agema.de>,
	"Peter Staubach" <staubach@redhat.com>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

> > the client uses mtime and size to detect file changes on=20
> the server.  if
> > the mtime doesn't change on the server, the clients won't detect any
> > data changes.
> >=20
> > what physical file system are you using on the server?
>=20
> Thanks for the reply, but thats exactly my problem: Mtime does change
> on the server, and the client even sees that change ( faster=20
> or slower=20
> depending on caching settings ).
>=20
> But the data on the client never gets updated.
>=20
> I tested some more, and this only happens if another=20
> application on the
> client has the file open for writing.
>=20
> I think it might have to do something with the data_unstable flag in
> nfs_refresh_inode - but I don't understand the kernel code well enough
> to see what happens exactly or how to fix it for us.

peter, do you happen to know how the solaris NFS client behaves when an
application holds a file open like this?

close-to-open is a convention, not a specification, so it's really up to
the client developers to implement what they think is right.  i'm
guessing that the Linux client is working as designed here.  i'm not
convinced it's very *convenient* behavior, though.


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