[Ocfs2-devel] [PATCH v3 1/2] aio: make kiocb->private NUll in init_sync_kiocb()

[Joel Becker]

On Fri, Jun 08, 2012 at 02:08:04PM +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 at oracle.com>
> Cc: stable at vger.kernel.org
> Acked-by: Jeff Moyer <jmoyer at redhat.com>
Acked-by: Joel Becker <jlbec at evilplan.org>

> ---
>  include/linux/aio.h |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/linux/aio.h b/include/linux/aio.h
> index 2314ad8..b1a520e 100644
> --- a/include/linux/aio.h
> +++ b/include/linux/aio.h
> @@ -140,6 +140,7 @@ struct kiocb {
>  		(x)->ki_dtor = NULL;			\
>  		(x)->ki_obj.tsk = tsk;			\
>  		(x)->ki_user_data = 0;                  \
> +		(x)->private = NULL;			\
>  	} while (0)
>  
>  #define AIO_RING_MAGIC			0xa10a10a1
> -- 
> 1.7.9.5
> 

-- 

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