#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 */