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

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Date:	Fri, 04 May 2007 09:10:36 -0400
From:	Peter Staubach <staubach@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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

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.

    Thanx...

       ps
-
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