md: Report failed arrays as broken in mdstat

Depending on if array has personality, it is either reported as active or
inactive. This patch adds third status "broken" for arrays with
personality that became inoperative. The reason is end users tend to
assume that "active" indicates array is operational.

Add "broken" state for inoperative arrays with personality and refactor
the code.

Signed-off-by: Mateusz Kusiak <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Song Liu <[email protected]>

Author: dancesWithMachines

drivers/md/md.c

@@ -8327,14 +8327,19 @@ static int md_seq_show(struct seq_file *seq, void *v)
 	spin_unlock(&all_mddevs_lock);
 	spin_lock(&mddev->lock);
 	if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
-		seq_printf(seq, "%s : %sactive", mdname(mddev),
-						mddev->pers ? "" : "in");
+		seq_printf(seq, "%s : ", mdname(mddev));
 		if (mddev->pers) {
+			if (test_bit(MD_BROKEN, &mddev->flags))
+				seq_printf(seq, "broken");
+			else
+				seq_printf(seq, "active");
 			if (mddev->ro == MD_RDONLY)
 				seq_printf(seq, " (read-only)");
 			if (mddev->ro == MD_AUTO_READ)
 				seq_printf(seq, " (auto-read-only)");
 			seq_printf(seq, " %s", mddev->pers->name);
+		} else {
+			seq_printf(seq, "inactive");
 		}
 
 		sectors = 0;