From 8c2653fb9ac4803e10f7ede7339e9eece414708a Mon Sep 17 00:00:00 2001
From: Liu Hua <sdu.liu@huawei.com>
Date: Tue, 1 Dec 2015 17:19:34 +0800
Subject: [PATCH] fix Put without Get in aufs

this Patch is ported from 3916561619d45a3d8ca17dfa467149824111023a

Signed-off-by: Liu Hua <sdu.liu@huawei.com>
Upstream-commit: 451f7517733087a8629fe20894b6c10a63bb155e
Component: engine
---
 components/engine/daemon/graphdriver/aufs/aufs.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/components/engine/daemon/graphdriver/aufs/aufs.go b/components/engine/daemon/graphdriver/aufs/aufs.go
index 0cb5a053d6..aa24185ff4 100644
--- a/components/engine/daemon/graphdriver/aufs/aufs.go
+++ b/components/engine/daemon/graphdriver/aufs/aufs.go
@@ -332,6 +332,14 @@ func (a *Driver) Put(id string) error {
 
 	m := a.active[id]
 	if m == nil {
+		// but it might be still here
+		if a.Exists(id) {
+			path := path.Join(a.rootPath(), "mnt", id)
+			err := Unmount(path)
+			if err != nil {
+				logrus.Debugf("Failed to unmount %s aufs: %v", id, err)
+			}
+		}
 		return nil
 	}
 	if count := m.referenceCount; count > 1 {