md: fix sync_action incorrect display during resync

JIRA: https://issues.redhat.com/browse/RHEL-94433

commit b7ee30f
Author: Zheng Qixing <zhengqixing@huawei.com>
Date:   Sat Aug 16 08:25:34 2025 +0800

    md: fix sync_action incorrect display during resync

    During raid resync, if a disk becomes faulty, the operation is
    briefly interrupted. The MD_RECOVERY_RECOVER flag triggered by
    the disk failure causes sync_action to incorrectly show "recover"
    instead of "resync". The same issue affects reshape operations.

    Reproduction steps:
      mdadm -Cv /dev/md1 -l1 -n4 -e1.2 /dev/sd{a..d} // -> resync happened
      mdadm -f /dev/md1 /dev/sda                     // -> resync interrupted
      cat sync_action
      -> recover

    Add progress checks in md_sync_action() for resync/recover/reshape
    to ensure the interface correctly reports the actual operation type.

    Fixes: 4b10a3b ("md: ensure resync is prioritized over recovery")
    Signed-off-by: Zheng Qixing <zhengqixing@huawei.com>
    Link: https://lore.kernel.org/linux-raid/20250816002534.1754356-3-zhengqixing@huaweicloud.com
    Signed-off-by: Yu Kuai <yukuai3@huawei.com>

Signed-off-by: Nigel Croxon <ncroxon@redhat.com>

Author: ncroxon

drivers/md/md.c

@@ -4874,9 +4874,33 @@ static bool rdev_needs_recovery(struct md_rdev *rdev, sector_t sectors)
 	       rdev->recovery_offset < sectors;
 }
 
+static enum sync_action md_get_active_sync_action(struct mddev *mddev)
+{
+	struct md_rdev *rdev;
+	bool is_recover = false;
+
+	if (mddev->resync_offset < MaxSector)
+		return ACTION_RESYNC;
+
+	if (mddev->reshape_position != MaxSector)
+		return ACTION_RESHAPE;
+
+	rcu_read_lock();
+	rdev_for_each_rcu(rdev, mddev) {
+		if (rdev_needs_recovery(rdev, MaxSector)) {
+			is_recover = true;
+			break;
+		}
+	}
+	rcu_read_unlock();
+
+	return is_recover ? ACTION_RECOVER : ACTION_IDLE;
+}
+
 enum sync_action md_sync_action(struct mddev *mddev)
 {
 	unsigned long recovery = mddev->recovery;
+	enum sync_action active_action;
 
 	/*
 	 * frozen has the highest priority, means running sync_thread will be
@@ -4900,8 +4924,17 @@ enum sync_action md_sync_action(struct mddev *mddev)
 	    !test_bit(MD_RECOVERY_NEEDED, &recovery))
 		return ACTION_IDLE;
 
-	if (test_bit(MD_RECOVERY_RESHAPE, &recovery) ||
-	    mddev->reshape_position != MaxSector)
+	/*
+	 * Check if any sync operation (resync/recover/reshape) is
+	 * currently active. This ensures that only one sync operation
+	 * can run at a time. Returns the type of active operation, or
+	 * ACTION_IDLE if none are active.
+	 */
+	active_action = md_get_active_sync_action(mddev);
+	if (active_action != ACTION_IDLE)
+		return active_action;
+
+	if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
 		return ACTION_RESHAPE;
 
 	if (test_bit(MD_RECOVERY_RECOVER, &recovery))