lock free dirstate

[Robert Collins]

On Mon, 2009-09-28 at 19:22 -0400, John Szakmeister wrote:
> 
> > ^- Presumably you don't need to 'mv foo foo.old' on POSIX platforms?
> 
> Or maybe leave it as is, if the goal is to do a better job on remote
> filesystems?  For instance, if I mount my Windows share under my Linux
> box? 

Its an OS thing [for the most part - definitely as far as 'local'
resources like working trees]. On linux a VFAT file system 'behaves' as
though mv foo bar works when bar exists. It actually isn't, so its
possible for power failures to leave the disk messy. I'm not 100% sure
whether a SMB mount can do 'mv foo bar' when bar exists.

Anyhow, its moot, as I am depending on 'mv missing-file new-file'
erroring to enforce serialisation on the data structure.

-Rob

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