linux-kernel - [PATCH v2] md raid1: allow writebehind to work on any leg device set WriteMostly

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Date:   Mon, 14 Aug 2023 14:01:15 +0200
From:   heinzm@...hat.com
To:     linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Cc:     xni@...hat.com, ncroxon@...hat.com
Subject: [PATCH v2] md raid1: allow writebehind to work on any leg device set WriteMostly

From: Heinz Mauelshagen <heinzm@...hat.com>

This is version 2 replacing my previous patch series as requested by Song Liu.

As the WriteMostly flag can be set on any component device of a RAID1
array, remove the constraint that it only works if set on the first one.


Signed-off-by: Heinz Mauelshagen <heinzm@...hat.com>
Tested-by: Xiao Ni <xni@...hat.com>
---
 drivers/md/raid1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index dd25832eb045..913cd46b786b 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1519,7 +1519,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 			 * allocate memory, or a reader on WriteMostly
 			 * is waiting for behind writes to flush */
 			if (bitmap &&
-			    test_bit(WriteMostly, &rdev->flags) &&
+			    write_behind &&
 			    (atomic_read(&bitmap->behind_writes)
 			     < mddev->bitmap_info.max_write_behind) &&
 			    !waitqueue_active(&bitmap->behind_wait)) {
-- 
2.41.0