ext4: Display the journal_async_commit mount option in /proc/mounts

Cc: Andreas Dilger <adilger@clusterfs.com>
Cc: Girish Shilamkar <girish@clusterfs.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

fs/ext4/super.c

@@ -731,6 +731,8 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
 	}
 	if (test_opt(sb, BARRIER))
 		seq_puts(seq, ",barrier=1");
+	if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
+		seq_puts(seq, ",journal_async_commit");
 	if (test_opt(sb, NOBH))
 		seq_puts(seq, ",nobh");
 	if (!test_opt(sb, EXTENTS))