md/md-bitmap: fix dm-raid max_write_behind setting

[ Upstream commit 2afe17794cfed5f80295b1b9facd66e6f65e5002 ]

It's supposed to be COUNTER_MAX / 2, not COUNTER_MAX.

Link: https://lore.kernel.org/linux-raid/20250524061320.370630-14-yukuai1@huaweicloud.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 91bc764a854c67da87c70576fd2a69f88960e998..f2ba541ed89d4d70e299a14979bc6509313ee840 100644 (file)
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -546,7 +546,7 @@ static int md_bitmap_new_disk_sb(struct bitmap *bitmap)
         * is a good choice?  We choose COUNTER_MAX / 2 arbitrarily.
         */
        write_behind = bitmap->mddev->bitmap_info.max_write_behind;
-       if (write_behind > COUNTER_MAX)
+       if (write_behind > COUNTER_MAX / 2)
                write_behind = COUNTER_MAX / 2;
        sb->write_behind = cpu_to_le32(write_behind);
        bitmap->mddev->bitmap_info.max_write_behind = write_behind;