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Date:	Thu, 28 Aug 2014 14:31:25 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Why does df fail to stat CIFS shares?
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On Aug 27 16:28, Achim Gratz wrote:
> Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
> > > -v, please.  What means "obviously" here?  Did you ask Netapp?
>=20
> No, I've tried all combinations of parameters to the open calls to
> absolutely no avail.  I then started to look at what the VolumeInformation
> call is supposed to be doing and decided that this might have a better
> chance of producing a workaround.
>=20
> > > The FileFsFullSizeInformation class is *old*, it has been introduced
> > > with Windows 2000.  Did you test all combinations I asked you for?  C=
an
> > > you provide detailed results?  It might help to find a working combin=
ation.
>=20
> All combinations you listed produced absolutely the same behaviour than
> before: the open suceeds and the VolumeInfo call fails.  I've tried a few
> other combinations that are forbidden according to MSDN and promptly had =
the
> open call fail, so I think I did this correctly...
>=20
> While searching the net I've found some notes saying that the only classes
> confirmed working everywhere didn't include FileFsFullSizeInformation.  T=
rue
> or not, that's what pushed me to rip it out.
>=20
> http://sourceforge.net/p/openxdk/patches/_discuss/thread/4b412944/4ba5/at=
tachment/undocumented.txt
>=20
> > Btw., one other hare-brained idea would be if the Netapp FS has a
> > somewhat different idea of the size of FILE_FS_FULL_SIZE_INFORMATION,
> > maybe due to a misunderstanding in alignment.  What you could try is
> > to make full_fsi a pointer:
> >=20
> >   PFILE_FS_FULL_SIZE_INFORMATION full_fsi =3D
> >   	(PFILE_FS_FULL_SIZE_INFORMATION)
> > 	alloca (2 * sizeof (FILE_FS_FULL_SIZE_INFORMATION));
> >=20
> > and then change all "full_fsi." to "full_fsi->"
>=20
> Tomorrow...
>=20
> > If nothing else works, try this workaround for size:
>=20
> That's essentially what I've done to get it working.  Not that exact patc=
h,
> so I'll try that out tomorrow as well, but that code path should produce
> correct output from df no matter of what FS it finds behind the mount.

I've applied my patch since it certainly doesn't hurt.  At least not
more than those bugs in various filesystems.  It seems the minimal
requirements for filesystems to get MSFT blessing are *very* low :(


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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