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Subject[PATCH 16/34] union-mount: Create IS_MNT_UNION()
Date
From: Jan Blunck <jblunck@suse.de>

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.

Signed-off-by: Valerie Aurora <vaurora@redhat.com>
---
fs/union.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/fs/union.h b/fs/union.h
index 1692803..c496823 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 *);
@@ -64,6 +65,7 @@ static inline struct path *union_find_dir(struct dentry *dentry,

#else /* CONFIG_UNION_MOUNT */

+#define IS_MNT_UNION(x) (0)
#define IS_DIR_UNIONED(x) (0)

#define d_free_unions(x) do { } while (0)
--
1.6.3.3


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