blk_queue_logical_block_size(9) centos man page | unix.com

BLK_QUEUE_LOGICAL_BL(9) 					   Block Devices					   BLK_QUEUE_LOGICAL_BL(9)

NAME
       blk_queue_logical_block_size - set logical block size for the queue

SYNOPSIS
       void blk_queue_logical_block_size(struct request_queue * q, unsigned short size);

ARGUMENTS
       q
	   the request queue for the device

       size
	   the logical block size, in bytes

DESCRIPTION
       This should be set to the lowest possible block size that the storage device can address. The default of 512 covers most hardware.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   BLK_QUEUE_LOGICAL_BL(9)