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Date:   Sat, 2 Sep 2017 10:09:42 -0700
From:   Linus Torvalds <>
To:     Andrew Bartlett <>
Cc:     Steve French <>,
        "L. A. Walsh" <>,
        Thorsten Leemhuis <>,
        Linux Kernel Mailing List <>,
        "" <>,
        Pavel Shilovsky <>
Subject: Re: RFC: Revert move default dialect from CIFS to to SMB3

On Fri, Sep 1, 2017 at 10:22 PM, Andrew Bartlett <> wrote:
> My quick research shows:
> SMB 2.1 but not SMB3 is on:
>  Windows 7
>  Windows 8
>  Windows 2008
>  Windows 2012
>  Samba 3.6 and earlier (SMB1 only by default)
> SMB3 is on:
>  Windows 8.1
>  Windows 2012 R2
>  Windows 10
>  Windows 2016
>  Samba 4.0 and above (released 2012)

But most, if not all, of those SMB3 cases _also_ support SMB2.1,
right?  So the "3.0 _only_" case ends up being a fairly rare case
where things have been explicitly limited, and any previous Linux use
must have had that explicit "vers=3.0" flag anyway?


Anyway, we can't avoid *some* breakage (ie the places that literally
only support 1.0 will have to add the explicit "vers=1.0" to get the

And I merged the code to add better error reporting yesterday, so
hopefully regardless of the default we choose the breakage is not
nearly as confusing to people any more.


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