VFS: Clean up shared mount flag propagation

[pandora-kernel.git] / include / linux / mount.h

diff --git a/include/linux/mount.h b/include/linux/mount.h
index 5d52753..375d43a 100644 (file)
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -34,7 +34,16 @@ struct mnt_namespace;
 
 #define MNT_SHARED     0x1000  /* if the vfsmount is a shared mount */
 #define MNT_UNBINDABLE 0x2000  /* if the vfsmount is a unbindable mount */
-#define MNT_PNODE_MASK 0x3000  /* propagation flag mask */
+/*
+ * MNT_SHARED_MASK is the set of flags that should be cleared when a
+ * mount becomes shared.  Currently, this is only the flag that says a
+ * mount cannot be bind mounted, since this is how we create a mount
+ * that shares events with another mount.  If you add a new MNT_*
+ * flag, consider how it interacts with shared mounts.
+ */
+#define MNT_SHARED_MASK        (MNT_UNBINDABLE)
+#define MNT_PROPAGATION_MASK   (MNT_SHARED | MNT_UNBINDABLE)
+
 
 struct vfsmount {
        struct list_head mnt_hash;