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由 Peter Lieven 提交于
this patch does 2 things: a) only do additional call outs if BDRV_BLOCK_ZERO is not already set. b) use the newly introduced bdrv_unallocated_blocks_are_zero() to return the zero state of an unallocated block. the used callout to bdrv_has_zero_init() is only valid right after bdrv_create. Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NPeter Lieven <pl@kamp.de> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
c3d86884