[PATCH 29/73] union-mount: Create IS_MNT_UNION() [ver #2]

[David Howells]

From: Jan Blunck <jblunck@xxxxxxx>

IS_MNT_UNION() tests whether a vfsmount is a union.  Note that a
directory in a union mounted file system is not necessarily unioned.
Use IS_DIR_UNIONED() to test that.

Original-author: Jan Blunck <jblunck@xxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

 fs/union.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/union.h b/fs/union.h
index e918a04..990dd16 100644
--- a/fs/union.h
+++ b/fs/union.h
@@ -51,6 +51,11 @@ struct union_stack {
 	struct path u_dirs[0];
 };
 
+static inline bool IS_MNT_UNION(struct vfsmount *mnt)
+{
+	return mnt->mnt_flags & MNT_UNION;
+}
+
 static inline bool IS_DIR_UNIONED(struct dentry *dentry)
 {
 	return !!dentry->d_union_stack;
@@ -77,6 +82,7 @@ struct path *union_find_dir(struct dentry *dentry, unsigned int layer)
 	return NULL;
 }
 
+static inline bool IS_MNT_UNION(struct vfsmount *mnt) { return false; }
 static inline bool IS_DIR_UNIONED(struct dentry *dentry) { return false; }
 static inline void d_free_unions(struct dentry *dentry) {}
 

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