loop: add ioctl for changing logical block size
This is a different approach from the first attempt in f2c6df7d ("loop: support 4k physical blocksize"). Rather than extending LOOP_{GET,SET}_STATUS, add a separate ioctl just for setting the block size. Reviewed-by: NMing Lei <ming.lei@redhat.com> Reviewed-by: NHannes Reinecke <hare@suse.com> Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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