[PATCH 4.14 003/222] bcache: trace missed reading by cache_missed

Greg Kroah-Hartman
2018-11-11T23:09:27Z

From: Tang Junhui <tang.junhui.linux@gmail.com>

commit 502b291568fc7faf1ebdb2c2590f12851db0ff76 upstream.

Missed reading IOs are identified by s->cache_missed, not the
s->cache_miss, so in trace_bcache_read() using trace_bcache_read
to identify whether the IO is missed or not.

Signed-off-by: Tang Junhui <tang.junhui.linux@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/md/bcache/request.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -792,7 +792,7 @@ static void cached_dev_read_done_bh(stru

bch_mark_cache_accounting(s->iop.c, s->d,
!s->cache_missed, s->iop.bypass);
- trace_bcache_read(s->orig_bio, !s->cache_miss, s->iop.bypass);
+ trace_bcache_read(s->orig_bio, !s->cache_missed, s->iop.bypass);

if (s->iop.status)
continue_at_nobarrier(cl, cached_dev_read_error, bcache_wq);