dirstate-v2: Change the on-disk format to be tree-shaped...
dirstate-v2: Change the on-disk format to be tree-shaped
Nodes are stored not only for tracked files but also for their ancestor
directories. A node has "pointers" (byte count from the start of the file)
to its direct child nodes. Everything can be accessed with zero copy.
Differential Revision:
https://phab.mercurial-scm.org/D10722
