diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index ab79612..c051798 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -30,8 +30,11 @@
  */
 static int ext2_release_file (struct inode * inode, struct file * filp)
 {
-	if (filp->f_mode & FMODE_WRITE)
-		ext2_discard_prealloc (inode);
+	if (filp->f_mode & FMODE_WRITE) {
+		mutex_lock(&EXT2_I(inode)->truncate_mutex);
+		ext2_discard_reservation(inode);
+		mutex_unlock(&EXT2_I(inode)->truncate_mutex);
+	}
 	return 0;
 }