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nodemap: track the total and unused amount of data in the rawdata file

Authored by marmoute.

Description

nodemap: track the total and unused amount of data in the rawdata file

We need to keep that information around:

  • total data will allow transaction to start appending new information without confusing other reader.
  • unused data will allow to detect when we should regenerate new rawdata file.

Differential Revision: https://phab.mercurial-scm.org/D7889