Index: linux-stage/fs/ext4/super.c
When ldiskfs run in failover mode whith read-only disk.
Part of allocation updates are lost and ldiskfs may fail
while mounting this is due to inconsistent state of
group-descriptor. Group-descriptor check is added after
journal replay.
===================================================================
--- linux-stage/fs/ext4/super.c	2016-11-06 15:15:30.892386878 +0530
+++ linux-stage.orig.1/fs/ext4/super.c	2016-11-08 10:56:45.579892189 +0530
@@ -3980,10 +3980,6 @@
			goto failed_mount2;
		}
	}
-	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
-		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
-		goto failed_mount2;
-	}

	sbi->s_gdb_count = db_count;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
@@ -4104,6 +4100,12 @@
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

 no_journal:
+
+	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
+		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
+		goto failed_mount2;
+	}
+
	/*
	 * Get the # of file system overhead blocks from the
	 * superblock if present.