>   *                   non-volatile media on completion.
> + * WRITE_BG          Background write. This is for background activity like
> + *                   the periodic flush and background threshold writeback
>   *
>   */
>  #define RW_MASK                      REQ_OP_WRITE
> @@ -202,6 +204,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t 
> offset,
>  #define WRITE_FLUSH          (REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH)
>  #define WRITE_FUA            (REQ_SYNC | REQ_NOIDLE | REQ_FUA)
>  #define WRITE_FLUSH_FUA              (REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH | 
> REQ_FUA)
> +#define WRITE_BG             (REQ_NOIDLE | REQ_BG)

I've been trying to kill off these WRITE_ flags as they aren't exactly
helpful, see my branch here that I'm waiting for the previous serious to
go in:

   http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/block-flags

Which also begs the question why you add the REQ_NOIDLE flag above, as
it's only applied to synchronous queues in cfq as far as I can tell.

And while I'm at nitpicking about the most trivial patch of the
series anyway:  any good reason to not just spell out the "BACKGROUND" ?
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