bd_contains is an implementation detail and should not be mentioned in
a userspace API documentation.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This is strictly user-space material at this point, so put it with the
other user-space API documentation.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>