Re: NFS in 2.1.130??

Jamie Lokier (
Wed, 2 Dec 1998 12:16:25 +0000

On Tue, Dec 01, 1998 at 03:59:51PM +0000, Alan Cox wrote:
> Jamie Lokier wrote:
> > This will not work. No kind of dot-locking will work with an NFS client
> > that caches data, which includes Linux 2.0.x and Linux 2.1.x, unless you
> procmail style dot locking works over NFS. NFS has an atomic rename,
> even though they screwed everything else up in NFSv2. Rename is the only
> real NFS safe operation to use.

I appreciate that the _locking_ works, but dot-locking does not flush
writes or revalidate cached reads on the locked file, does it?

This is a cause of lost mail amongst other things.

Of course, if you do fcntl-locking _as well_, and the nfs client
guarantees proper ordering of reads & writes around the lock, everything
should be ok.

-- Jamie

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