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dm writecache: count number of blocks written, not number of write bios

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[ Upstream commit b2676e1482 ]

Change dm-writecache, so that it counts the number of blocks written
instead of the number of write bios. Bios can be split and requeued
using the dm_accept_partial_bio function, so counting bios caused
inaccurate results.

Fixes: e3a35d0340 ("dm writecache: add event counters")
Reported-by: Yu Kuai <yukuai1@huaweicloud.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mikulas Patocka
2022-07-11 16:31:26 -04:00
committed by Greg Kroah-Hartman
parent 5fef35fc1a
commit f06cbeff23
2 changed files with 14 additions and 8 deletions
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10
Documentation/admin-guide/device-mapper/writecache.rst
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@@ -80,11 +80,11 @@ Status:
4. the number of blocks under writeback
5. the number of read blocks
6. the number of read blocks that hit the cache
7. the number of write requests
8. the number of write requests that hit uncommitted block
9. the number of write requests that hit committed block
10. the number of write requests that bypass the cache
11. the number of write requests that are allocated in the cache
7. the number of write blocks
8. the number of write blocks that hit uncommitted block
9. the number of write blocks that hit committed block
10. the number of write blocks that bypass the cache
11. the number of write blocks that are allocated in the cache
12. the number of write requests that are blocked on the freelist
13. the number of flush requests
14. the number of discard requests