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. September 2010 BLK_QUEUE_MAX_HW_SEC(9)