[PATCH v3 5/8] docs: sysfs-block: document stable_writes

[Eric Biggers]

From: Eric Biggers <ebiggers@xxxxxxxxxx>

/sys/block/<disk>/queue/stable_writes is completely undocumented.
Document it.

Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
 Documentation/ABI/stable/sysfs-block | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
index de3b86a3dfa55..288626e8cb532 100644
--- a/Documentation/ABI/stable/sysfs-block
+++ b/Documentation/ABI/stable/sysfs-block
@@ -516,6 +516,23 @@ Description:
 		scheduler module, if it isn't already present in the system.
 
 
+What:		/sys/block/<disk>/queue/stable_writes
+Date:		September 2020
+Contact:	linux-block@xxxxxxxxxxxxxxx
+Description:
+		[RW] This file will contain '1' if memory must not be modified
+		while it is being used in a write request to this device.  When
+		this is the case and the kernel is performing writeback of a
+		page, the kernel will wait for writeback to complete before
+		allowing the page to be modified again, rather than allowing
+		immediate modification as is normally the case.  This
+		restriction arises when the device accesses the memory multiple
+		times where the same data must be seen every time -- for
+		example, once to calculate a checksum and once to actually write
+		the data.  If no such restriction exists, this file will contain
+		'0'.  This file is writable for testing purposes.
+
+
 What:		/sys/block/<disk>/queue/throttle_sample_time
 Date:		March 2017
 Contact:	linux-block@xxxxxxxxxxxxxxx
-- 
2.34.1