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 capabilities of the
       I/O controller.

       max_dev_sectors is a hard limit imposed by the storage device for READ/WRITE requests. It
       is set by the disk driver.

       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 4.8.                 January 2017                   BLK_QUEUE_MAX_HW_SEC(9)