Re: [v2 PATCH 1/1] mtd: mtd_blkdevs: handle REQ_FLUSH request and do explicit flush of writeback buffer

From: Brian Norris
Date: Wed Apr 16 2014 - 02:57:44 EST


On Sat, Mar 08, 2014 at 09:59:14PM +0900, Roman Pen wrote:
> From: Roman Peniaev <r.peniaev@xxxxxxxxx>
>
> mtd_blkdevs is device with volatile cache (writeback buffer), so it should support
> REQ_FLUSH to do explicit flush.
>
> Without this patch 'sync' does not guarantee that writeback buffer will be flushed
> on disk in case of power off, e.g.:
>
> $ cp some_file /mnt
> $ sync
>
> ### POWER OFF
>
> In case of this sequence writeback buffer will not be flushed on disk.
>
> This patch fixes this behaviour and explicitly reports to block layer that flush
> requests are being supported.
>
> Signed-off-by: Roman Peniaev <r.peniaev@xxxxxxxxx>
> CC: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
> CC: Brian Norris <computersforpeace@xxxxxxxxx>
> CC: linux-mtd@xxxxxxxxxxxxxxxxxxx
> CC: linux-kernel@xxxxxxxxxxxxxxx

Pushed to l2-mtd.git. Thanks!

Brian
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