loop: Add LOOP_SET_BLOCK_SIZE in compat ioctl
This change adds LOOP_SET_BLOCK_SIZE as one of the supported ioctls in lo_compat_ioctl. It only takes an unsigned long argument, and in practice a 32-bit value works fine. Reviewed-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NEvan Green <evgreen@chromium.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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