linux-kernel - Re: [V2 PATCH 1/2] aio: make kiocb->private NUll in init_sync

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Message-ID: <20120605093103.GA21560@kroah.com>
Date:	Tue, 5 Jun 2012 18:31:03 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Junxiao Bi <junxiao.bi@...cle.com>
Cc:	ocfs2-devel@....oracle.com, linux-aio@...ck.org, jmoyer@...hat.com,
	mfasheh@...e.com, jlbec@...lplan.org, bcrl@...ck.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	joe.jin@...cle.com, dave.kleikamp@...cle.com
Subject: Re: [V2 PATCH 1/2] aio: make kiocb->private NUll in init_sync_kiocb()

On Tue, Jun 05, 2012 at 03:26:49PM +0800, Junxiao Bi wrote:
> Ocfs2 uses kiocb.*private as a flag of unsigned long size. In
> commit a11f7e6 ocfs2: serialize unaligned aio, the unaligned
> io flag is involved in it to serialize the unaligned aio. As
> *private is not initialized in init_sync_kiocb() of do_sync_write(),
> this unaligned io flag may be unexpectly set in an aligned dio.
> And this will cause OCFS2_I(inode)->ip_unaligned_aio decreased
> to -1 in ocfs2_dio_end_io(), thus the following unaligned dio
> will hang forever at ocfs2_aiodio_wait() in ocfs2_file_aio_write().
> 
> Signed-off-by: Junxiao Bi <junxiao.bi@...cle.com>
> ---
>  include/linux/aio.h |    1 +
>  1 file changed, 1 insertion(+)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>
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