blk_queue_max_hw_sectors

Langue: en

Version: October 2010 (fedora - 01/12/10)

Section: 9 (Appels noyau Linux)

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.