Commit bb351aba authored Dec 26, 2018 by Weiping Zhang Committed by Jens Axboe Jan 04, 2019

block: add documentation for io_timeout



Add documentation for /sys/block/<disk>/queue/io_timeout.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 59f75fd0

Documentation/ABI/testing/sysfs-block

+9 −0

Original line number	Original line	Diff line number	Diff line
	@@ -279,3 +279,12 @@ Description:
	size in 512B sectors of the zones of the device, with		size in 512B sectors of the zones of the device, with
	the eventual exception of the last zone of the device		the eventual exception of the last zone of the device
	which may be smaller.		which may be smaller.

			What: /sys/block/<disk>/queue/io_timeout
			Date: November 2018
			Contact: Weiping Zhang <zhangweiping@didiglobal.com>
			Description:
			io_timeout is the request timeout in milliseconds. If a request
			does not complete in this time then the block driver timeout
			handler is invoked. That timeout handler can decide to retry
			the request, to fail it or to start a device recovery strategy.

Documentation/block/queue-sysfs.txt

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -67,6 +67,13 @@ If set to a value larger than 0, the kernel will put the process issuing
	IO to sleep for this amount of microseconds before entering classic		IO to sleep for this amount of microseconds before entering classic
	polling.		polling.

			io_timeout (RW)
			---------------
			io_timeout is the request timeout in milliseconds. If a request does not
			complete in this time then the block driver timeout handler is invoked.
			That timeout handler can decide to retry the request, to fail it or to start
			a device recovery strategy.

	iostats (RW)		iostats (RW)
	-------------		-------------
	This file is used to control (on/off) the iostats accounting of the		This file is used to control (on/off) the iostats accounting of the