From 7757062193baf5b0fd48c7c81be7c9376b42572f Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Fri, 18 Jan 2019 01:21:11 -0500
Subject: [PATCH] dm: add missing trace_block_split() to
 __split_and_process_bio()

commit 075c18c3e124a1511ebc10a89f1858c8a77dcb01 upstream.

Provides useful context about bio splits in blktrace.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Shile Zhang <shile.zhang@linux.alibaba.com>
Acked-by: Caspar Zhang <caspar@linux.alibaba.com>
---
 drivers/md/dm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 9dd6342d9d82..109a6a903be1 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1629,6 +1629,7 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
 				part_stat_unlock();
 
 				bio_chain(b, bio);
+				trace_block_split(md->queue, b, bio->bi_iter.bi_sector);
 				ret = generic_make_request(bio);
 				break;
 			}
-- 
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