linux-kernel - Re: [PATCH] virtio-blk: add support for cache flush

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Message-Id: <200909221604.41838.rusty@rustcorp.com.au>
Date:	Tue, 22 Sep 2009 16:04:41 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Christoph Hellwig <hch@....de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio-blk: add support for cache flush

On Fri, 18 Sep 2009 03:27:42 am Christoph Hellwig wrote:
> 
> Recent qemu has added a VIRTIO_BLK_F_FLUSH flag to advertise that the
> virtual disk has a volatile write cache that needs to be flushed.  In case
> we see this feature implement tell the Linux block layer about the fact
> and use the new VIRTIO_BLK_T_FLUSH to flush the cache when required.  This
> allows for an correct and simple implementation of write barriers.

Thanks Christoph, this looks very nice.  Applied, will push soon.

> + *   VIRTIO_BLK_T_OUT may be combinaed with VIRTIO_BLK_T_SCSI_CMD or
> + *   VIRTIO_BLK_T_BARRIER.  VIRTIO_BLK_T_FLUSH is a command of it's own
> + *   and may no be comined with any of the other flags.

I fixed the typos here :)

Thanks!
Rusty.
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