Re: [PATCH] 2.4.19-rc1/2.5.25 provide dummy fsync() routine for directories on NFS mounts

[Tom McNeal <trmcneal@attbi.com>]

Rex Dieter wrote:
> 
> Trond Myklebust <trond.myklebust@fys.uio.no> wrote:
> 
> > >>>>> " " == Matthias Andree <ma@dt.e-technik.uni-dortmund.de> writes:
> >      > What if the NFS stuff is not mounted with sync or explicitly
> >      > mounted async? Will an nfsd still do synchronous writes to
> >      > directories?
> 
> > Of course. It is not possible for the NFS client to switch this
> > behaviour off, since it is part of the server side specifications in
> > the protocol.
> > The only thing that can screw you up is if you use the 'async' option
> > in /etc/exports on the server.
> 
> How is specifying 'async' in /etc/exports on the NFS server different than a
> NFS client explicitly mounting async?
> 
> -- Rex


The /etc/exports async option allows the server to tell the client
that it has indeed written data/metadata to the disk, regardless
of what has actually happened.

So, the client sync/async affects *when* the client writes to the
server, and the server sync/async affects *how* (OK, and *when*) the 
server replies to the client.  

Regards -

Tom

--
------------------------------------------------------------
Tom McNeal       trmcneal@attbi.com     (650)906-0761 (cell) 
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