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
