blk_queue_alignment_offset (9) - Linux Man Pages
blk_queue_alignment_offset: set physical block alignment offset
blk_queue_alignment_offset - set physical block alignment offset
void blk_queue_alignment_offset(struct request_queue
*q, unsigned int offset);
- the request queue for the device
- alignment offset in bytes
Some devices are naturally misaligned to compensate for things like the legacy DOS partition table 63-sector offset. Low-level drivers should call this function for devices whose first sector is not naturally aligned.