linux-ext4 - Re: [PATCH] ext4: use directio end_io error status to finish unwritten aio dio correctly

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Date:	Mon, 22 Feb 2016 12:11:02 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Theodore Ts'o" <tytso@....edu>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: use directio end_io error status to finish
 unwritten aio dio correctly

On Mon, Feb 22, 2016 at 09:19:14AM +0100, Jan Kara wrote:
> On Sun 21-02-16 17:28:26, Dave Chinner wrote:
> > On Fri, Feb 19, 2016 at 02:18:29PM +0100, Jan Kara wrote:
> > > On Fri 19-02-16 09:02:32, Dave Chinner wrote:
> > > > Won't that now call ext4_put_io_end() ->
> > > > ext4_convert_unwritten_extents() with an uninitialised offset and
> > > > size?
> > > > 
> > > > i.e. I don't think this prevents warnings, and may make things
> > > > worse when real errors occur....
> > > 
> > > Yeah, if IO error occurs while writing to unwritten extent we need to just
> > > destroy the IO end without doing the extent conversion (since we don't know
> > > how much got written). Attached patch should fix the issue - full xfstests
> > > run is in progress but a quick check using generic/299 has passed.
> > > 
> > > How do we merge this? It depends on the changes in Dave's tree so do we
> > > merge it via that? I have other ext4 changes pending in this area so Ted
> > > would then have to pull some branch from Dave's tree. Guys?
> > 
> > The xfs-dio-fix-4.6 branch in the XFS tree is stable, so feel free
> > to pull it into other trees. However, it might be better for me to
> > append this patch to that branch once it is revewed and tested to
> > keep them all together in a stable branch. It can still be pulled
> > into other trees if needed...
> 
> Full xfstests run completed for me fine with the patch so it should be
> good to go in your tree in that regard. So additional review would be fine
> though. Darrick, can you have a look?

Looks good to me and passes generic/25[02], so
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> 
> 								Honza
> -- 
> Jan Kara <jack@...e.com>
> SUSE Labs, CR
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