[PATCH -next 4/9] md: add a new helper reshape_interrupted()

[Yu Kuai]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

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@xxxxxxxxxx>
---
 drivers/md/md.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 09368517cc6c..b961c1b4ead7 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