md: add a new helper reshape_interrupted()

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

Cc: [email protected] # v6.7+
Signed-off-by: Yu Kuai <[email protected]>
Signed-off-by: Xiao Ni <[email protected]>
Acked-by: Mike Snitzer <[email protected]>
Signed-off-by: Song Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: YuKuai-huawei

drivers/md/md.h

@@ -581,6 +581,25 @@ 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);