linux-kernel - Re: iov_iter

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Message-ID: <20170427041918.ts33j22wm352xjni@codemonkey.org.uk>
Date:   Thu, 27 Apr 2017 00:19:18 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: iov_iter_pipe warning.

On Fri, Apr 21, 2017 at 06:54:30PM +0100, Al Viro wrote:
 > On Wed, Apr 12, 2017 at 03:03:18PM -0400, Dave Jones wrote:
 > 
 > > Well it's been running an hour without incident, which looks promising.
 > > I'll leave it run, but I'd say you're on the right track given how quick
 > > it reproduced so far.
 > 
 > Could you try this and see if it works?  What happens is that unlike
 > e.g. generic_file_read_iter/generic_file_write_iter, NFS O_DIRECT handling
 > does not make sure that iov_iter had been advanced by the amount
 > actually transferred - it is left advanced by the amount *requested*.

Sorry for delay on this, been sick.   Just gave this a run for 12 hours.
Looks good to me.

	Dave