commit cead89bb08c0f64e23886f1c18df9bb98e97c55c
author hujianyang <hujianyang@huawei.com> Mon Nov 24 18:25:21 2014 +0800
committer Miklos Szeredi <mszeredi@suse.cz> Sat Dec 13 00:59:52 2014 +0100
tree dbf10b40ef83804ac343cbdf4f3776af685d1e62
parent 1ba38725a351f91769918b132c17fb7fcaf6c2f5

ovl: Use macros to present ovl_xattr

This patch adds two macros:

OVL_XATTR_PRE_NAME and OVL_XATTR_PRE_LEN

to present ovl_xattr name prefix and its length. Also, a
new macro OVL_XATTR_OPAQUE is introduced to replace old
*ovl_opaque_xattr*.

Fix the length of "trusted.overlay." to *16*.

Signed-off-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

fs/overlayfs/overlayfs.h

diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index d176b67..17ac5af 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -23,7 +23,9 @@
 #define OVL_TYPE_MERGE_OR_LOWER(type) \
 	(OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type))
 
-extern const char *ovl_opaque_xattr;
+#define OVL_XATTR_PRE_NAME "trusted.overlay."
+#define OVL_XATTR_PRE_LEN  16
+#define OVL_XATTR_OPAQUE   OVL_XATTR_PRE_NAME"opaque"
 
 static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
 {