[Samba] How to turn on SMB3 POSIX extensions in Samba server?

Rowland penny rpenny at samba.org
Sat Oct 5 07:45:02 UTC 2019

On 05/10/2019 06:49, Chris Han via samba wrote:
> Hi, I want to use the SMB3 POSIX extensions in the latest Samba (with
> SMB3.1.1, vers=3.1.1). By following the user manual, I have added the
> "posix" mount option when mounting, but it shows the following error
> messages.
> Error messages:
> [xxxxx] CIFS VFS: Server does not support mounting with posix SMB3.11
> extensions.
> [xxxxx] CIFS VFS: cifs_mount failed w/return code = -95
> Mount option:
> https://www.mankier.com/8/mount.cifs#posix%7Cunix%7Clinux
> https://wiki.samba.org/index.php/SMB3-Linux
> Mount commands:
> mount –t cifs -o username=<user>,vers=3.1.1,posix //<address>/share
> /mnt/share
> mount –t cifs -o username=<user>,vers=3.1.1,posix,mfsymlinks
> //<address>/share /mnt/share
> Software and kernel version:
> 1. Ubuntu 19.04, Kernel 5.0, Samba 4.10
> 2. Ubuntu 18.04.3, Kernel 5.0, Samba 4.7
> How to turn on SMB3 POSIX extensions in Samba server?
> Thanks.

Ah, sorry, but as far as I am aware, that manpage is wrong, it should say:


     (default) Enable Unix Extensions for this mount. Requires CIFS 
(vers=1.0) and a server supporting them.

There are no Unix extensions for SMBv2 or SMBv3 (yet)


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