blk_queue_max_hw_sectors(9) suse man page | unix.com

BLK_QUEUE_MAX_HW_SEC(9) 					   Block Devices					   BLK_QUEUE_MAX_HW_SEC(9)

NAME
       blk_queue_max_hw_sectors - set max sectors for a request for this queue

SYNOPSIS
       void blk_queue_max_hw_sectors(struct request_queue * q, unsigned int max_hw_sectors);

ARGUMENTS
       q
	   the request queue for the device

       max_hw_sectors
	   max hardware sectors in the usual 512b unit

DESCRIPTION
       Enables a low level driver to set a hard upper limit, max_hw_sectors, on the size of requests. max_hw_sectors is set by the device driver
       based upon the combined capabilities of I/O controller and storage device.

       max_sectors is a soft limit imposed by the block layer for filesystem type requests. This value can be overridden on a per-device basis in
       /sys/block/<device>/queue/max_sectors_kb. The soft limit can not exceed max_hw_sectors.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						   BLK_QUEUE_MAX_HW_SEC(9)