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List:       git
Subject:    Re: [PATCH] add GIT_FAST_STAT mode for Cygwin
From:       "Shawn O. Pearce" <spearce () spearce ! org>
Date:       2008-09-24 15:16:53
Message-ID: 20080924151653.GQ3669 () spearce ! org
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Alex Riesen <raa.lkml@gmail.com> wrote:
> 2008/9/24 Shawn O. Pearce <spearce@spearce.org>:
> >
> > However Dmitry pointed out that he has cases where this faster
> > function doesn't work correctly, and it was path specific. Some
> > areas of the filesystem work, others don't, on the same system.
> 
> Huh?! What are they? What paths require cygwin's handling
> which aren't handled already? (the absolute paths are handled).

Cygwin lets you mount a filesystem at a different part of the
filesystem.  Sort of like Linux's mount -t bind (IIRC).

For example its possible to remap C:\foo\bar\widget\srcs into
C:\cygwin\home\lib, so you see the files under /home/lib in Cygwin,
even though that folder is empty (or flat out doesn't exist)
in Windows.

That filesystem remount stuff is part of the reason why the Cygwin
stat/lstat routines are so much slower than the native Windows ones.
They have to evaluate the path space twice (once in Cygwin, again
in the Windows kernel).

-- 
Shawn.
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