nvme: implement the Flush command
Implement a real flush instead of faking it. This is especially important as Qemu assume Write back cashing by default and thus requires a working cache flush operation for data integrity. Signed-off-by: NChristoph Hellwig <hch@lst.de> Acked-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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