qemu-img: In "map", use the returned "file" from bdrv_get_block_status
Now all drivers should return a correct "file", we can make use of it, even with the recursion into backing chain above. Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com> Message-id: 1453780743-16806-15-git-send-email-famz@redhat.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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