[Samba] NFS locking ...maybe?

Don Meyer dlmeyer at uiuc.edu
Thu May 24 19:54:13 GMT 2007

First off, I'll save the devs the trouble/time -- they'll say that 
re-sharing an NFS-mounted resource with Samba is not supported and is 
generally a bad idea.   (Some might even go so far as to say a 
"really bad idea"... ;-)

That said, I've done this successfully.  Somewhat.  It worked fine - 
until we started putting real users on the system and adding groups 
to fill out the security model.  Then we discovered the "16 
groups/user" hard limit built into NFS.   That alone sunk the effort...

We saw a similar behavior -- users could not write/create new files, 
but could generally do everything else.   The failure to write/create 
manifested as a permission denied error, and not a locking error, 
however.   If you are seeing a locking error, you may have a different problem.


At 12:07 PM 5/24/2007, Ashley M. Kirchner wrote:
>    Hi folks,
>    After some more trial and error, I was able to get a bit further 
> in the game with the permission issues I had (previous message was 
> titled 'Samba permissions...)  Now I'm able to get onto the system, 
> browse and read/copy/delete files off of the shares.  What I can't 
> do is put stuff on because I get a locking error.
>    The setup is as follows:
>    Server 1 --> exports /storage/ftpusers
>    Server 2 --> NFS mounts (autofs) the above export as /mnt/ftpusers
>    At the same time, it also shares that mount through samba
>    Server 3 (which is a WinBox) then accesses the above share.
>    What I CAN do:
>    From Server 3, I can go into network places, click on the samba 
> share and get on it.  I can browse everything that's on the share 
> (which translates to everything that's on Server 1 in 
> /storage/ftpusers/ )  I can copy files OFF of that share, and I can 
> delete files off of that share.
>    What I CANNOT do:
>    From Server 3, I cannot PUT any files on that share.  I get an 
> error message that says:
>    "Cannot copy testfile.txt: The process cannot access the file 
> because another process has locked a portion of the file."
>    I know with absolute certainty that there is no actual program 
> trying to access the file on either Server 2 or Server 1, which 
> leads me to believe that maybe NFS locking is having something to do with it.
>Somewhere in the mounting of the NFS, or the share through samba, 
>things get locked.  What I don't understand is, why can I read, 
>copy, AND delete from the share, but I can't PUT anything.
>    The NFS mount is done with rw, as is the Samba share.  I don't 
> think it would've allowed me to delete files otherwise, but I could be wrong.
>    Anyone have any ideas why I'm getting locking issues?  And which 
> one is the culprit?
>W | It's not a bug - it's an undocumented feature.
>  +--------------------------------------------------------------------
>  Ashley M. Kirchner <mailto:ashley at pcraft.com>   .   303.442.6410 x130
>  IT Director / SysAdmin / Websmith             .     800.441.3873 x130
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Don Meyer                                           <dlmeyer at uiuc.edu>
Network Manager, ACES Academic Computing Facility
Technical System Manager, ACES TeleNet System
UIUC College of ACES, Information Technology and Communication Services

   "They that can give up essential liberty to obtain a little 
temporary safety,
         deserve neither liberty or safety."     -- Benjamin Franklin, 1759 

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