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Message-ID: <1341419217.18786.3.camel@lappy> 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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