centos man page for blk_lld_busy

Query: blk_lld_busy

OS: centos

Section: 9

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

BLK_LLD_BUSY(9) 						   Block Devices						   BLK_LLD_BUSY(9)

NAME
blk_lld_busy - Check if underlying low-level drivers of a device are busy
SYNOPSIS
int blk_lld_busy(struct request_queue * q);
ARGUMENTS
q the queue of the device being checked
DESCRIPTION
Check if underlying low-level drivers of a device are busy. If the drivers want to export their busy state, they must set own exporting function using blk_queue_lld_busy first. Basically, this function is used only by request stacking drivers to stop dispatching requests to underlying devices when underlying devices are busy. This behavior helps more I/O merging on the queue of the request stacking driver and prevents I/O throughput regression on burst I/O load.
RETURN
0 - Not busy (The request stacking driver should dispatch request) 1 - Busy (The request stacking driver should stop dispatching request)
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 BLK_LLD_BUSY(9)
Related Man Pages
blk_init_queue(9) - suse
devctl(3) - freebsd
drv_usecwait(9f) - centos
drv_usecwait(9f) - suse
drv_usecwait(9f) - v7
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