The journal blocks of external journal device should not
be counted as overhead.
Signed-off-by: Chin-Tsung Cheng <chintzung@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
                 */
                overhead += ngroups * (2 + sbi->s_itb_per_group);
 
-               /* Add the journal blocks as well */
-                overhead += sbi->s_journal->j_maxlen;
+               /* Add the internal journal blocks as well */
+               if (sbi->s_journal && !sbi->journal_bdev)
+                       overhead += sbi->s_journal->j_maxlen;
 
                sbi->s_overhead_last = overhead;
                smp_wmb();