SMB3 Posix Setinfo class?

Jeremy Allison jra at
Mon Sep 26 17:21:31 UTC 2022

On Mon, Sep 26, 2022 at 11:12:28AM -0600, David Mulder wrote:
>Currently I've defined in the smb3 posix spec a set info request to 
>use the FilePosixInformation class defined here:
>I noticed that MS-FSCC (section 2.4) defines different info classes 
>for set and query.
>It seems to me that FilePosixInformation, as it's currently defined, 
>is better defined as a query only class. Most of the attributes are 
>not modifiable via a setinfo. I think we should define an additional 
>info class for setinfo, allowing you to set POSIXPerms (any other 
>attributes make sense here?).
>Either way, I don't think anyone has implemented setinfo for 
>FilePosixInformation anyway (it's not in Samba at least).

What specific attributes do you want to set with
FilePosixInformation ?

The file mode (rwxrwxrwx) is set by a normal
SetNTACL request with a specially formatted

I can't think of anything else POSIX-specific that
can't be set with a standard SMB3 setinfo
the same way it's set on a Windows handle.

I don't think we need SetFilePosixInformation
at all.

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