- only update extent pages *after* flush of real page has been done
    - sync both create/drop of table into undolog (for disk tables)


storage/ndb/src/kernel/blocks/dblqh/DblqhMain.cpp:
  inform TUP which LCP to restore each fragment to
storage/ndb/src/kernel/blocks/dbtup/Dbtup.hpp:
  1) inform TUP which LCP to restore each fragment to
  2) inform TUP both before/after a page has been written
storage/ndb/src/kernel/blocks/dbtup/DbtupDiskAlloc.cpp:
  1) inform TUP which LCP to restore each fragment to
  2) inform TUP both before/after a page has been written
storage/ndb/src/kernel/blocks/dbtup/DbtupMeta.cpp:
  log both create/drop table
storage/ndb/src/kernel/blocks/lgman.cpp:
  let TUP know about all LCPs
storage/ndb/src/kernel/blocks/pgman.cpp:
  add "when" argument to disk_page_unmap_callback so that TUP gets informed both before and after page writeout
    so that extent pages can be updated only *after* page has been written
storage/ndb/src/kernel/blocks/tsman.cpp:
  remove lsn from update page free bits
  use wal for page vs extent relation
storage/ndb/src/kernel/blocks/tsman.hpp:
  remove lsn from update page free bits
  use wal for page vs extent relation