--- a/fs/reiserfs/super.c	2017-05-29 00:14:45.000000000 -0400
+++ b/fs/reiserfs/super.c	2017-05-29 00:51:44.000000000 -0400
@@ -67,17 +67,28 @@
 static int reiserfs_sync_fs(struct super_block *s, int wait)
 {
 	struct reiserfs_transaction_handle th;
+	int got_lock;
 
 	/*
 	 * Writeback quota in non-journalled quota case - journalled quota has
 	 * no dirty dquots
 	 */
+
+	if ( down_read_trylock(&s->s_umount) )
+		got_lock = 1;
+	else
+		got_lock = 0;
+
 	dquot_writeback_dquots(s, -1);
 	reiserfs_write_lock(s);
 	if (!journal_begin(&th, s, 1))
 		if (!journal_end_sync(&th))
 			reiserfs_flush_old_commits(s);
 	reiserfs_write_unlock(s);
+
+	if ( got_lock )
+		up_read(&s->s_umount);
+
 	return 0;
 }