From 5201dc449e4b6b6d7e92f7f974269b11681f98b5 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@redhat.com>
Date: Thu, 1 Sep 2016 11:11:59 +0200
Subject: ovl: use cached acl on underlying layer

Instead of calling ->get_acl() directly, use get_acl() to get the cached
value.

We will have the acl cached on the underlying inode anyway, because we do
permission checking on the both the overlay and the underlying fs.

So, since we already have double caching, this improves performance without
any cost.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 024352f..d50d1ea 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -10,6 +10,7 @@
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/xattr.h>
+#include <linux/posix_acl.h>
 #include "overlayfs.h"
 
 static int ovl_copy_up_truncate(struct dentry *dentry)
@@ -314,14 +315,14 @@ struct posix_acl *ovl_get_acl(struct inode *inode, int type)
 	const struct cred *old_cred;
 	struct posix_acl *acl;
 
-	if (!IS_POSIXACL(realinode))
+	if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !IS_POSIXACL(realinode))
 		return NULL;
 
 	if (!realinode->i_op->get_acl)
 		return NULL;
 
 	old_cred = ovl_override_creds(inode->i_sb);
-	acl = realinode->i_op->get_acl(realinode, type);
+	acl = get_acl(realinode, type);
 	revert_creds(old_cred);
 
 	return acl;
-- 
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