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: stable@vger.kernel.org # v6.7+
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Xiao Ni <xni@redhat.com>
Acked-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240305072306.2562024-5-yukuai1@huaweicloud.com

diff --git a/drivers/md/md.h b/drivers/md/md.h
index a40e898fe57e5330e861081fc537f67f8d322fe9..d5721bd77f63b6071937caab079141f09df8598a 100644 (file)
--- a/drivers/md/md.h
+++ b/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);