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-rw-r--r--include/linux/mount.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 5d527536486..375d43a5d80 100644
--- 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;