linux-kernel - [PATCH -next v2 12/28] md/raid5-cache: use new apis to suspend array for r5c_journal_mode

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Message-Id: <20230828020021.2489641-13-yukuai1@huaweicloud.com>
Date:   Mon, 28 Aug 2023 10:00:05 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     agk@...hat.com, snitzer@...nel.org, dm-devel@...hat.com,
        song@...nel.org, xni@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com,
        yangerkun@...wei.com
Subject: [PATCH -next v2 12/28] md/raid5-cache: use new apis to suspend array for r5c_journal_mode_store()

From: Yu Kuai <yukuai3@...wei.com>

r5c_journal_mode_set() will suspend array and it has only 2 caller, the
other caller raid_ctl() already suspend the array with new apis.

This is not hot path, so performance is not concerned.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/raid5-cache.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 109367fec7c0..38d38f2e33bc 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -2584,9 +2584,7 @@ int r5c_journal_mode_set(struct mddev *mddev, int mode)
 	    mode == R5C_JOURNAL_MODE_WRITE_BACK)
 		return -EINVAL;
 
-	mddev_suspend(mddev);
 	conf->log->r5c_journal_mode = mode;
-	mddev_resume(mddev);
 
 	pr_debug("md/raid:%s: setting r5c cache mode to %d: %s\n",
 		 mdname(mddev), mode, r5c_journal_mode_str[mode]);
@@ -2611,11 +2609,11 @@ static ssize_t r5c_journal_mode_store(struct mddev *mddev,
 		if (strlen(r5c_journal_mode_str[mode]) == len &&
 		    !strncmp(page, r5c_journal_mode_str[mode], len))
 			break;
-	ret = mddev_lock(mddev);
+	ret = mddev_suspend_and_lock(mddev);
 	if (ret)
 		return ret;
 	ret = r5c_journal_mode_set(mddev, mode);
-	mddev_unlock(mddev);
+	mddev_unlock_and_resume(mddev);
 	return ret ?: length;
 }
 
-- 
2.39.2