From bdcfd44fb5b5fb8fd660e7f93f1095c507481024 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?=
 <emulatorman@parabola.nu>
Date: Sat, 16 Apr 2016 15:30:54 -0300
Subject: Linux-libre 4.5.1-gnu

---
 drivers/block/loop.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'drivers/block/loop.c')

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 423f4ca7d..0b816b24b 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -706,6 +706,24 @@ static inline int is_loop_device(struct file *file)
 	return i && S_ISBLK(i->i_mode) && MAJOR(i->i_rdev) == LOOP_MAJOR;
 }
 
+/*
+ * for AUFS
+ * no get/put for file.
+ */
+struct file *loop_backing_file(struct super_block *sb)
+{
+	struct file *ret;
+	struct loop_device *l;
+
+	ret = NULL;
+	if (MAJOR(sb->s_dev) == LOOP_MAJOR) {
+		l = sb->s_bdev->bd_disk->private_data;
+		ret = l->lo_backing_file;
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(loop_backing_file);
+
 /* loop sysfs attributes */
 
 static ssize_t loop_attr_show(struct device *dev, char *page,
-- 
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