OS locks must DIE

[Aaron Bentley]

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Alexander Belchenko wrote:
> ... So, subject says all I think about OS locks.

If I recall correctly, one of the reasons for dirstate's os locking was
so that we don't have to update the whole file at once.  I wonder if we
could do a journalling approach instead?  A workingtree's inventory
could be expressed as its parent-tree inventory plus an inventory delta.

Aaron
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