linux-kernel - Re: [PATCH] knfsd: nfsd: Handle ERESTARTSYS from syscalls.

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Date:	Mon, 16 Jun 2008 12:54:46 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Chuck Lever <chucklever@...il.com>
Cc:	Peter Staubach <staubach@...hat.com>, NeilBrown <neilb@...e.de>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] knfsd: nfsd: Handle ERESTARTSYS from syscalls.

On Mon, 2008-06-16 at 11:09 -0400, Chuck Lever wrote:

> I think an error reply is much better than no reply in nearly every
> case.  NFS3ERR_JUKEBOX/NFS4ERR_DELAY is an interesting idea, but
> something else again will probably be required for v4.1 with sessions.

NFS3ERR_JUKEBOX/NFS4ERR_DELAY may be inappropriate if the nfs daemon has
already started handling the RPC call, since you may be interrupting a
non-idempotent operation.

The only complete solution to this problem is NFSv4.1 with persistent
sessions.

Cheers
  Trond

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