From 502b291568fc7faf1ebdb2c2590f12851db0ff76 Mon Sep 17 00:00:00 2001
From: Tang Junhui <tang.junhui.linux@gmail.com>
Date: Mon, 8 Oct 2018 20:41:08 +0800
Subject: [PATCH] bcache: trace missed reading by cache_missed
Git-commit: 502b291568fc7faf1ebdb2c2590f12851db0ff76
References: Git-fixes
Patch-mainline: v4.20-rc1

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.

(Coly Li: rebased for SLE15 kernel)

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>
Acked-by: Coly Li <colyli@suse.de>

---
 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
@@ -845,7 +845,7 @@ 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);