From a4aa5e56e5189b88a2891cdcc350dac618810354 Mon Sep 17 00:00:00 2001
From: Damien Le Moal <damien.lemoal@wdc.com>
Date: Mon, 8 May 2017 16:40:46 -0700
Subject: [PATCH] dm: fix REQ_OP_ZONE_RESET bio handling
Git-commit: a4aa5e56e5189b88a2891cdcc350dac618810354
Patch-mainline: v4.13-rc1
References: fate#322738,fate#322919,fate#322950,fate#323773

The REQ_OP_ZONE_RESET bio has no payload and zero sectors.  Its position
is the only information used to indicate the zone to reset on the
device.  Due to its zero length, this bio is not cloned and sent to the
target through the non-flush case in __split_and_process_bio().  Add an
additional case in that function to call __split_and_process_non_flush()
without checking the clone info size.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>

---
 drivers/md/dm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index ff22aa2a07b5..d85adec43fe8 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1384,6 +1384,10 @@ static void __split_and_process_bio(struct mapped_device *md,
 		ci.sector_count = 0;
 		error = __send_empty_flush(&ci);
 		/* dec_pending submits any data associated with flush */
+	} else if (bio_op(bio) == REQ_OP_ZONE_RESET) {
+		ci.bio = bio;
+		ci.sector_count = 0;
+		error = __split_and_process_non_flush(&ci);
 	} else {
 		ci.bio = bio;
 		ci.sector_count = bio_sectors(bio);
-- 
2.13.1