[LTP] [PATCH v3] syscalls/ioctl_loop05: Use correct blockdev to get logical_block_size

[Jan Stancek]

----- Original Message -----
> Using inode block size is also wrong because it is for filesystem io(such as
> we format
> filesystem can specify block size for data or log or metadata), it is not
> suitable
> for logical block size.

If this copes correctly with btrfs too, I don't have objections.
I retested on failing s390 setup and v3 works there OK.