Non-UNIX permission models (resent)

Jeremy Allison jra at
Fri Sep 30 16:01:21 GMT 2005

On Fri, Sep 30, 2005 at 02:27:07PM +0200, yves.lejeune at wrote:
> > 
> > I've thought about what we would need to change in the kernel in order 
> to 
> > allow non-UNIX permission models on some filesystems/mounts, and I've 
> > discussed this with SUSE folks at the SUSE Labs conference in Prague 
> > yesterday. Surprisingly, nobody seemed to be strongly opposed to what I 
> > presented, rather the opposite. Samba is the most prominent potential 
> user of 
> > non-UNIX permission models on Linux as far as I can see, so I would like 
> to 
> > discuss the topic with you.
> Hello Andreas,
> I am wondering if you would be interested too in modifying the VFS layer
> to provide non-case-sensitive operations - at least a "casestat" 
> operation.
> This can greatly enhance the performance of Samba when large directories
> are present. I have myself added such a "casestat" operation in my Samba 
> VFS module.
> The difficult point then is to take it into account in the Samba code,
> e.g. I was able to update filename.c, but I gave up for 
> call_trans2findfirst().

You don't need that - all the code to do this is already in Samba
code code. If you have a VFS module that exports a case insensitive
view of a file system then you simply set :

case sensitive = yes

in the [share] section exporting your VFS module and you're done.


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