Il 03/07/2012 15:46, Kevin Wolf ha scritto:
>> > Introduce a new feature bit and configuration field that provide
>> > support for toggling the cache mode between writethrough and writeback.
>> >
>> > Also rename VIRTIO_BLK_F_WCACHE to VIRTIO_BLK_F_WCE for consistency with
>> > the spec.
> My spec (and my kernel as well) call it VIRTIO_BLK_F_FLUSH.
>
> What's the status of the kernel and spec side of the change?
Both posted. The spec patch that introduces VIRTIO_BLK_F_CONFIG_WCE
also renames it to VIRTIO_BLK_F_WCE, since that's really what it does.
See this old comment in the kernel (not in the latest git anymore):
/*
* If the FLUSH feature is supported we do have support for
* flushing a volatile write cache on the host. [...]
* otherwise, we must assume that the host does not
* perform any kind of volatile write caching.
*/
Paolo
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