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xen/blkfront: Implement FUA with BLKIF_OP_WRITE_BARRIER
authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Tue, 2 Nov 2010 14:38:33 +0000 (10:38 -0400)
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Tue, 2 Nov 2010 15:27:59 +0000 (11:27 -0400)
The BLKIF_OP_WRITE_BARRIER is a full ordered barrier, so we can use it
to implement FUA as well as a plain FLUSH.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Christoph Hellwig <hch@lst.de>

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