linux-kernel - Re: [PATCH 30/40] nfs: fixup missing error code

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Message-Id: <1178284688.24217.37.camel@twins>
Date:	Fri, 04 May 2007 15:18:08 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Peter Staubach <staubach@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Thomas Graf <tgraf@...g.ch>,
	David Miller <davem@...emloft.net>,
	James Bottomley <James.Bottomley@...elEye.com>,
	Mike Christie <michaelc@...wisc.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Phillips <phillips@...gle.com>
Subject: Re: [PATCH 30/40] nfs: fixup missing error code

On Fri, 2007-05-04 at 09:10 -0400, Peter Staubach wrote:
> Peter Zijlstra wrote:
> > Commit 0b67130149b006628389ff3e8f46be9957af98aa lost the setting of tk_status
> > to -EIO when there was no progress with short reads.
> >
> > Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > ---
> >  fs/nfs/read.c |    4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > Index: linux-2.6-git/fs/nfs/read.c
> > ===================================================================
> > --- linux-2.6-git.orig/fs/nfs/read.c	2007-03-13 14:35:53.000000000 +0100
> > +++ linux-2.6-git/fs/nfs/read.c	2007-03-13 14:36:05.000000000 +0100
> > @@ -384,8 +384,10 @@ static int nfs_readpage_retry(struct rpc
> >  	/* This is a short read! */
> >  	nfs_inc_stats(data->inode, NFSIOS_SHORTREAD);
> >  	/* Has the server at least made some progress? */
> > -	if (resp->count == 0)
> > +	if (resp->count == 0) {
> > +		task->tk_status = -EIO;
> >  		return 0;
> > +	}
> >  
> >  	/* Yes, so retry the read at the end of the data */
> >  	argp->offset += resp->count;
> 
> This doesn't look right to me.  It is not an error for the NFS server
> to return 0 bytes.  It is usually an indication of EOF.  If an error
> occured, then the NFS server would have returned an error.

Ah, ok; I found this when looking through NFS changelogs, and this
change was not changelogged. Consider it dropped.

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