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  • Simon Sapin's avatar
    dirstate-v2: Add storage space for nanoseconds precision in file mtimes · 308d9c245337
    Simon Sapin authored
    For now the sub-second component is always set to zero for tracked files and
    symlinks. (The mtime of directories for the `readdir`-skipping optimization
    is a different code path and already uses the full precision available.)
    
    This extra storage uses the space previously freed by replacing the 32-bit
    `mode` field by two bits in the existing `flags` field, so the overall size
    of nodes is unchanged. (This space had been left as padding for this purpose.)
    
    Also move things around in the node layout and documentation to have less
    duplication. Now that they have the same representation, directory mtime and
    file mtime are kept in the same field. (Only either one can exist for a given
    node.)
    
    Differential Revision: https://phab.mercurial-scm.org/D11655
    308d9c245337