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dm writecache: count number of blocks discarded, not number of discard bios 

Change dm-writecache, so that it counts the number of blocks discarded
instead of the number of discard bios. Make it consistent with the
read and write statistics counters that were changed to count the
number of blocks instead of bios.

Fixes: e3a35d0340 ("dm writecache: add event counters")
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mikulas Patocka 2022-07-11 16:31:52 -04:00 committed by Mike Snitzer
parent b2676e1482
commit 2ee73ef60d
2 changed files with 2 additions and 2 deletions
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2
Documentation/admin-guide/device-mapper/writecache.rst
View File

@ -89,7 +89,7 @@ Status:
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
14. the number of discarded blocks
Messages:
flush

2
drivers/md/dm-writecache.c
View File

@ -1514,7 +1514,7 @@ static enum wc_map_op writecache_map_flush(struct dm_writecache *wc, struct bio
static enum wc_map_op writecache_map_discard(struct dm_writecache *wc, struct bio *bio)
{
wc->stats.discards++;
wc->stats.discards += bio->bi_iter.bi_size >> wc->block_size_bits;
if (writecache_has_error(wc))
return WC_MAP_ERROR;