Implementing new features in samba and smbfs

Jeremy Allison jra at
Thu Jan 24 10:21:07 GMT 2002

On Thu, Jan 24, 2002 at 03:00:52PM +0100, Urban Widmark wrote:
> On Thu, 24 Jan 2002, Andrew Bartlett wrote:
> > John Newbigin wrote:
> > > 
> > > I am looking at the feasibility of adding some features to the SMB
> > > protocol to allow UNIX file information so the linux smbfs can access
> > > things like the file mode and possibly the user and group id.
> [...]
> > 
> > The server side has been done.  HP had 'CIFS Unix extenstions' in their
> > version of Samba (known as CIFS/9000) for a while, and Jeremy has ported
> > it to 2.2 and HEAD (at least in part) in the last few weeks.
> Has it been merged or is it in the process of being merged?
> > I'm sure any work on smbfs would be very much apprciated - but contact
> > the maintainer.
> Hey! That's me!
> John, what you want and more (device nodes, symlinks, hard links) is
> covered by the "CIFS Extensions for UNIX systems v2.0" (use google).
> Don't know how much you have done but ...
> The spec adds a SMB_QUERY_FILE_UNIX_BASIC "infolevel" to the protocol.
> To do the things you listed you need to make smbfs read this and that is
> done by adding the infolevel to smb_proc_readdir_long() and
> smb_decode_long_dirent(). Also look at the getattr variants.
> Changing ownership and permissions is done by smb_notify_change(). It
> needs to be told when it can do that and then add a new setattr().
> The spec describes how to detect that a server supports these extensions,
> it's just a bit in the capabilities word.

The spec will be updated soon to match the implementation
details (ie. I had to work a few bugs out when implementing).


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