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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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