Prev: [PATCH] acpi: fix unused function warning
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From: Rusty Russell on 15 Jun 2010 22:00
On Tue, 15 Jun 2010 10:13:48 pm Christoph Hellwig wrote:
> If we want to support barriers with the cache=writethrough mode in qemu
> we need to tell the block layer that we only need queue drains to
> implement a barrier. Follow the model set by SCSI and IDE and assume
> that there is no volatile write cache if the host doesn't advertize it.
> While this might imply working barriers on old qemu versions or other
> hypervisors that actually have a volatile write cache this is only a
> cosmetic issue - these hypervisors don't guarantee any data integrity
> with or without this patch, but with the patch we at least provide
> data ordering.
>
> Signed-off-by: Christoph Hellwig <hch(a)lst.de>

Thanks, applied.

Cheers,
Rusty.
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