On 05/05/2011 02:50 PM, Christoph Hellwig wrote:
Please don't repeat the barrier mistake done in the Xen and virtio-blk/lguest
protocols. It really doesn't make sense to put this kind of strict odering
in. If we really want ordering let's do it using SCSI ordered tags at least
to use a standard implementation.
And SCSI already supports the FUA bit to force a write to be writethrough,
even if the QEMU SCSI code doesn't implement.
You're right, I reviewed the history of barriers and you can consider
this gone.
Paolo
