linux-kernel - Re: [PATCH] virtio-blk: allow toggling host cache between writeback and writethrough

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Date:	Wed, 04 Jul 2012 18:26:57 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	kvm@...r.kernel.org
Subject: Re: [PATCH] virtio-blk: allow toggling host cache between writeback
 and writethrough

On Tue, 2012-07-03 at 15:19 +0200, Paolo Bonzini wrote:
> diff --git a/include/linux/virtio_blk.h b/include/linux/virtio_blk.h
> index e0edb40..18a1027 100644
> --- a/include/linux/virtio_blk.h
> +++ b/include/linux/virtio_blk.h
> @@ -37,8 +37,9 @@
>  #define VIRTIO_BLK_F_RO                5       /* Disk is read-only */
>  #define VIRTIO_BLK_F_BLK_SIZE  6       /* Block size of disk is available*/
>  #define VIRTIO_BLK_F_SCSI      7       /* Supports scsi command passthru */
> -#define VIRTIO_BLK_F_FLUSH     9       /* Cache flush command support */
> +#define VIRTIO_BLK_F_WCE       9       /* Writeback mode enabled after reset */
>  #define VIRTIO_BLK_F_TOPOLOGY  10      /* Topology information is available */
> +#define VIRTIO_BLK_F_CONFIG_WCE        11      /* Writeback mode available in config */ 

Wouldn't this change break any usermode code that implements virtio-blk?

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