linux-kernel - [PATCH md-6.8 v2 4/9] md: add a new helper reshape

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Message-Id: <20240305072306.2562024-5-yukuai1@huaweicloud.com>
Date: Tue,  5 Mar 2024 15:23:01 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: xni@...hat.com,
	zkabelac@...hat.com,
	agk@...hat.com,
	snitzer@...nel.org,
	mpatocka@...hat.com,
	dm-devel@...ts.linux.dev,
	song@...nel.org,
	yukuai3@...wei.com,
	heinzm@...hat.com,
	jbrassow@...hat.com,
	neilb@...e.de
Cc: linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH md-6.8 v2 4/9] md: add a new helper reshape_interrupted()

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

The helper will be used for dm-raid456 later to detect the case that
reshape can't make progress.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
Signed-off-by: Xiao Ni <xni@...hat.com>
Acked-by: Mike Snitzer <snitzer@...nel.org>
---
 drivers/md/md.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 684cc866402a..7f955115d78d 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -570,6 +570,25 @@ static inline bool md_is_rdwr(struct mddev *mddev)
 	return (mddev->ro == MD_RDWR);
 }
 
+static inline bool reshape_interrupted(struct mddev *mddev)
+{
+	/* reshape never start */
+	if (mddev->reshape_position == MaxSector)
+		return false;
+
+	/* interrupted */
+	if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
+		return true;
+
+	/* running reshape will be interrupted soon. */
+	if (test_bit(MD_RECOVERY_WAIT, &mddev->recovery) ||
+	    test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
+	    test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
+		return true;
+
+	return false;
+}
+
 static inline int __must_check mddev_lock(struct mddev *mddev)
 {
 	return mutex_lock_interruptible(&mddev->reconfig_mutex);
-- 
2.39.2