block-backend: remove blk_flush_all
We can teach Xen to drain and flush each device as it needs to, instead of trying to flush ALL devices. This removes the last user of blk_flush_all. The function is therefore removed under the premise that any new uses of blk_flush_all would be the wrong paradigm: either flush the single device that requires flushing, or use an appropriate flush_all mechanism from outside of the BlkBackend layer. Signed-off-by:John Snow <jsnow@redhat.com> Reviewed-by:
Max Reitz <mreitz@redhat.com> Acked-by:
Fam Zheng <famz@redhat.com> Signed-off-by:
Kevin Wolf <kwolf@redhat.com> (cherry picked from commit 49137bf6) Signed-off-by:
Michael Roth <mdroth@linux.vnet.ibm.com>
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