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docs: sysfs-block: document stable_writes

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

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20211209003833.6396-6-ebiggers@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Eric Biggers 2021-12-08 16:38:30 -08:00 committed by Jens Axboe
parent 849ab826e1
commit 1163010418
1 changed files with 17 additions and 0 deletions
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Documentation/ABI/stable/sysfs-block
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@ -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@vger.kernel.org
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@vger.kernel.org