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block: add default implementations for bdrv_co_get_block_status()
bdrv_co_get_block_status_from_file() and bdrv_co_get_block_status_from_backing() set *file to bs->file and bs->backing respectively, so that bdrv_co_get_block_status() can recurse to them. Future block drivers won't have to duplicate code to implement this. Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Manos Pitsidianakis <el13635@mail.ntua.gr> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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