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authorWeiping Zhang <zhangweiping@didiglobal.com>2018-12-26 11:56:33 +0800
committerJens Axboe <axboe@kernel.dk>2019-01-04 19:19:51 -0700
commitbb351abaf5cd4f9237e1b3094d9cc04853de6d95 (patch)
tree0173b76e9df11f30e15aaaff05a0575dc6b89f19 /Documentation/block/queue-sysfs.txt
parent59f75fd0e31532bdcf65f754516cac2954d5ddc7 (diff)
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>
Diffstat (limited to 'Documentation/block/queue-sysfs.txt')
-rw-r--r--Documentation/block/queue-sysfs.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt
index 39e286d7afc9..83b457e24bba 100644
--- a/Documentation/block/queue-sysfs.txt
+++ b/Documentation/block/queue-sysfs.txt
@@ -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
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)
-------------
This file is used to control (on/off) the iostats accounting of the