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.
---
fs/union.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/fs/union.h b/fs/union.h
index db7c70c..89527b7 100644
--- a/fs/union.h
+++ b/fs/union.h
@@ -49,6 +49,7 @@ struct union_stack {
struct path u_dirs[0];
};
+#define IS_MNT_UNION(mnt) ((mnt)->mnt_flags & MNT_UNION)
#define IS_DIR_UNIONED(dentry) ((dentry)->d_union_stack)
extern void d_free_unions(struct dentry *);
@@ -65,6 +66,7 @@ struct path *union_find_dir(struct dentry *dentry, unsigned int layer)
#else /* CONFIG_UNION_MOUNT */
+#define IS_MNT_UNION(x) (0)
#define IS_DIR_UNIONED(x) (0)
#define d_free_unions(x) do { } while (0)
--
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