From 06f29cc81f0350261f59643a505010531130eea0 Mon Sep 17 00:00:00 2001
From: Zhouyi Zhou <zhouzhouyi@gmail.com>
Date: Wed, 10 Jan 2018 00:34:19 -0500
Subject: [PATCH] ext4: save error to disk in __ext4_grp_locked_error()
Git-commit: 06f29cc81f0350261f59643a505010531130eea0
Patch-mainline: v4.16-rc1
References: bsc#1052766

In the function __ext4_grp_locked_error(), __save_error_info()
is called to save error info in super block block, but does not sync
that information to disk to info the subsequence fsck after reboot.

This patch writes the error information to disk.  After this patch,
I think there is no obvious EXT4 error handle branches which leads to
"Remounting filesystem read-only" will leave the disk partition miss
the subsequence fsck.

Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Acked-by: Jan Kara <jack@suse.cz>

---
 fs/ext4/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2a7faf94bb90..be71f24a75a0 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -743,6 +743,7 @@ __acquires(bitlock)
 	}
 
 	ext4_unlock_group(sb, grp);
+	ext4_commit_super(sb, 1);
 	ext4_handle_error(sb);
 	/*
 	 * We only get here in the ERRORS_RO case; relocking the group
-- 
2.13.6