linux-kernel - [PATCH 5.4 083/177] dm writecache: handle REQ

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Message-Id: <20191216174837.756474123@linuxfoundation.org>
Date:   Mon, 16 Dec 2019 18:48:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Maged Mokhtar <mmokhtar@...asan.org>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 5.4 083/177] dm writecache: handle REQ_FUA

From: Maged Mokhtar <mmokhtar@...asan.org>

commit c1005322ff02110a4df7f0033368ea015062b583 upstream.

Call writecache_flush() on REQ_FUA in writecache_map().

Cc: stable@...r.kernel.org # 4.18+
Signed-off-by: Maged Mokhtar <mmokhtar@...asan.org>
Acked-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-writecache.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -1218,7 +1218,8 @@ bio_copy:
 			}
 		} while (bio->bi_iter.bi_size);
 
-		if (unlikely(wc->uncommitted_blocks >= wc->autocommit_blocks))
+		if (unlikely(bio->bi_opf & REQ_FUA ||
+			     wc->uncommitted_blocks >= wc->autocommit_blocks))
 			writecache_flush(wc);
 		else
 			writecache_schedule_autocommit(wc);