qemu-io: Don't use global bs in command implementations
Pass in the BlockDriverState to the command handlers instead of using the global variable. This is an important step to make the commands usable outside of qemu-io. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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