Add documentation for /sys/block/<disk>/queue/io_timeout.
Signed-off-by: Weiping Zhang <zhangweip...@didiglobal.com>
---
Documentation/ABI/testing/sysfs-block | 10 ++++++++++
Documentation/block/queue-sysfs.txt | 7 +++++++
2 files changed, 17 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-block
b/Documentation/ABI/testing/sysfs-block
index dea212db9df3..f254a374710a 100644
--- a/Documentation/ABI/testing/sysfs-block
+++ b/Documentation/ABI/testing/sysfs-block
@@ -271,3 +271,13 @@ Description:
size of 512B sectors of the zones of the device, with
the eventual exception of the last zone of the device
which may be smaller.
+
+What: /sys/block/<disk>/queue/io_timeout
+Date: November 2018
+Contact: Weiping Zhang <zhangweip...@didiglobal.com>
+Description:
+ io_timeout is a request’s timeouts at block layer in
+ milliseconds. When the underlying driver starts processing
+ a request, the generic block layer will start a timer, if
+ this request cannot be completed in io_timeout milliseconds,
+ a timeout event will occur.
diff --git a/Documentation/block/queue-sysfs.txt
b/Documentation/block/queue-sysfs.txt
index 2c1e67058fd3..f0c9bbce73fd 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 amont of microseconds before entering classic
polling.
+io_timeout (RW)
+---------------
+This is a request’s timeouts at block layer in milliseconds. When the
+underlying driver starts processing a request, the generic block layer
+will start a timer, if this request cannot be completed in io_timeout
+milliseconds, a timeout event will occur.
+
iostats (RW)
-------------
This file is used to control (on/off) the iostats accounting of the
--
2.14.1
