ext4: commit super block if fs record error when journal record without error

Now, 'es->s_state' maybe covered by recover journal. And journal errno
maybe not recorded in journal sb as IO error. ext4_update_super() only
update error information when 'sbi->s_add_error_count' large than zero.
Then 'EXT4_ERROR_FS' flag maybe lost.
To solve above issue just recover 'es->s_state' error flag after journal
replay like error info.

Signed-off-by: Ye Bin <[email protected]>
Reviewed-by: Baokun Li <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Ye Bin

fs/ext4/super.c

@@ -5959,6 +5959,7 @@ static int ext4_load_journal(struct super_block *sb,
 		err = jbd2_journal_wipe(journal, !really_read_only);
 	if (!err) {
 		char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
+
 		if (save)
 			memcpy(save, ((char *) es) +
 			       EXT4_S_ERR_START, EXT4_S_ERR_LEN);
@@ -5967,6 +5968,14 @@ static int ext4_load_journal(struct super_block *sb,
 			memcpy(((char *) es) + EXT4_S_ERR_START,
 			       save, EXT4_S_ERR_LEN);
 		kfree(save);
+		es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state &
+					   EXT4_ERROR_FS);
+		/* Write out restored error information to the superblock */
+		if (!bdev_read_only(sb->s_bdev)) {
+			int err2;
+			err2 = ext4_commit_super(sb);
+			err = err ? : err2;
+		}
 	}
 
 	if (err) {