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Subject: Re: Registering new |WNNC_NET_*| keys ? / Re: Document support for @
 character in UNC paths
To: cygwin AT cygwin DOT com
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From: Cedric Blancher via Cygwin <cygwin AT cygwin DOT com>
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On Wed, 26 Feb 2025 at 17:29, Corinna Vinschen via Cygwin
<cygwin AT cygwin DOT com> wrote:
>
> On Feb 26 17:13, Cedric Blancher via Cygwin wrote:
> > On Wed, 26 Feb 2025 at 16:50, Corinna Vinschen via Cygwin
> > <cygwin AT cygwin DOT com> wrote:
> > >
> > > On Feb 26 16:23, Roland Mainz via Cygwin wrote:
> > > > On Wed, Feb 26, 2025 at 2:36 PM Corinna Vinschen via Cygwin
> > > > <cygwin AT cygwin DOT com> wrote:
> > > > >
> > > > > On Feb 26 11:15, Roland Mainz via Cygwin wrote:
> > > > > > On Wed, Feb 26, 2025 at 2:22 AM Jeremy Drake via Cygwin
> > > > > > <cygwin AT cygwin DOT com> wrote:
> > > > > > > On Tue, 25 Feb 2025, Takeshi Nishimura via Cygwin wrote:
> > > > > > > > No, it's beegfs.sys you install.
> > > > > > > > SMB is not used, it uses its own protocol. If you do a
> > > > > > > > FileRemoteProtocolInfo query the protocol field says it's a
> > > > > > > > WNNC_NET_RDR2SAMPLE.
> > > > > > >
> > > > > > > Always nice when a driver doesn't change "sample" idenfiers.  It seems
> > > > > > > Virtualbox shared folders also squats on this identifier.  I imagine
> > > > > > > things don't go well if one attempts to install beegfs.sys on a virtualbox
> > > > > > > virtual machine with their guest drivers installed...
> > > > > >
> > > > > > I think the problem is that no one in the OpenSource world really
> > > > > > knows how to register new |WNNC_NET_*| keys. QEmu shared folders,
> > > > > > DOKANY, ms-nfs41-client, etc. all use |WNNC_NET_RDR2SAMPLE| because
> > > > > > the sample filesystem code uses that.
> > > > >
> > > > > So if ms-nfs41-client uses WNNC_NET_RDR2SAMPLE, we don't have to handle
> > > > > these shares when checking the WNNC_NET_MS_NFS provider.  While it would
> > > > > be nice if the nfs v4 driver would use some other WNNC type,
> > > >
> > > > Our plan is to get our own |WNNC_NET_*| key value if we can find the
> > > > person at Microsoft which is maintaining that list (preferred key
> > > > names would be |WNNC_NET_MSNFS41CLIENT| (for CITI's ms-nfs41-client)
> > > > and |WNNC_NET_MSNFS42CLIENT| for our version.
> > > >
> > > > And at the same time maybe help DOKANY&co to get their own
> > > > |WNNC_NET_*| key, too.
> > > >
> > > > > this is
> > > > > at least helpful for handling WNNC_NET_MS_NFS shares, because they
> > > > > have more than one quirk...
> > > >
> > > > I know... that's one reason we started working on the ms-nfs41-client
> > > > project, and at the same time it's API being compatible with the
> > > > MS-NFSv3 and the Exceed/OpenText-NFS drivers (that's why we support
> > > > the "NfsV3Attributes" (incl. uid/gid), "NfsSymlinkTargetName",
> > > > "NfsActOnLink" etc. Win32 extended attributes;
> > > > https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-fscc/ff4df658-7f27-476a-8025-4074c0121eec
> > > > is still on the ToDo list) - but also extend the functionality, e.g.
> > > > support NFSv4.1 ACLs (mapped to Win32 ACLs via a script-driven
> > > > idmapper), sparse file support (for HPC environments), and
> > > > ms-nfs42-client will add AlternateDataStream support if the NFSv4.1
> > > > server supports NFS "named attributes".
> > >
> > > I mentioned it months ago, and I mention it again:
> > >
> > > It would be really great if the filesystem name returned by
> > > NtQueryVolumeInformationFile(FileFsAttributeInformation) would not be
> > > "NFS", like the MS NFS, but something like "NFS4" or "NFSv4".  This
> > > would allow Cygwin's fs_info::update() in mount.cc to recognize the
> > > filesystem as something special, and the code could call either the
> > > special NFS functions, or the Windows functions, or extra functions just
> > > for NFSv4 as time goes by.
> >
> > Well, that backfires because the same applications which want
> > NfsV3Attributes also look at FILE_FS_ATTRIBUTE_INFORMATION
> > FileSystemName, and STOP WORKING using NfsV3Attributes if it's not
> > "NFS".
> > From a driver's vendor position Exceed had that problem, OpenText
> > inherited that problem, CITI had to do it on Microsoft's instructions
> > (the CITI driver was a joint venture of SUN and Microsoft), and now
> > Roland&Tigran&CERN&DESY have to do it too.
>
> I wasn't aware there are other projects using the undocumented NFS
> interfaces.  As far as Cygwin is concerned, it would be the simplest
> thing to add a check for the "NFSv4" FS name and handle it accordingly.
>
> OTOH, there are other ways to differ between MS NFS and NFSv4 in
> fs_info::update(), for instance by checking the filesystem flags.
>
> MS NFS only sets FILE_CASE_PRESERVED_NAMES to TRUE, but no other
> flag.  Therefore, if we know the flags, or a minimal set of flags
> NFSv4 sets, we can distinguish both NFS versions and ultimately add code
> handling NFSv4 different from MS NFS where necessary or prudent in the
> future.
>
> For an example of handling filesystems using the same FS name differently,
> see  for instance the MINIMAL_WIN_NTFS_FLAGS in mount.cc:
>
> https://sourceware.org/cgit/newlib-cygwin/tree/winsup/cygwin/mount.cc#n391

This might not be trivial if we want to be generic and also include
the OpenText folks. ms-nfs41-client and the Exceed/OpenText NFSv4
clients are completely different projects.

But I just had a chat with Chuck Lever <chuck DOT lever AT oracle DOT com>, maybe
ORACLE can find someone in Microsoft to get new WNNC_NET_* values
registered.
I would prefer the official way, e.g. get new WNNC_NET_* values
registered, instead of letting Cygwin suffer from more workarounds.

Ced
-- 
Cedric Blancher <cedric DOT blancher AT gmail DOT com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur

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