1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/migrate_mode.h b/include/linux/migrate_mode.h
new file mode 100644
index 000000000000..ebf3d89a3919
--- /dev/null
+++ b/include/linux/migrate_mode.h
@@ -0,0 +1,16 @@
+#ifndef MIGRATE_MODE_H_INCLUDED
+#define MIGRATE_MODE_H_INCLUDED
+/*
+ * MIGRATE_ASYNC means never block
+ * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
+ *      on most operations but not ->writepage as the potential stall time
+ *      is too significant
+ * MIGRATE_SYNC will block when migrating pages
+ */
+enum migrate_mode {
+        MIGRATE_ASYNC,
+        MIGRATE_SYNC_LIGHT,
+        MIGRATE_SYNC,
+};
+
+#endif          /* MIGRATE_MODE_H_INCLUDED */