[Samba] cannot set gpfs:sharemodes to yes

Christian Ambach ambi at samba.org
Fri May 11 05:23:25 MDT 2012

On 05/11/2012 12:39 PM, Zdenek SMetana wrote:
> I'm trying to set up samba share exporting gpfs filesystem and I strugle
> with setting sharemode to yes. Samba is 3.6.5, gpfs version is 3.2.1-29
> (the latest available for 3.2 branch). Everything works fine when sharemode
> is set to no, but I'd rather insist to switch it to yes. That's what man
> page says:

I am not sure if Samba 3.6 and GPFS 3.2 were tested together recently as 
3.2 is even out of support by IBM.
But the share modes code has been in Samba for a long while now, so it 
should work and it does with more recent GPFS versions.

Did you see that problem on earlier GPFS 3.2 PTF releases? Maybe 
something has changed on the GPFS side. But as 3.2 is out of service, 
there won't be future updates to it I am afraid.

You could still create GPFS traces and ask IBM support why GPFS rejects 
that request. Once the cause is known, we might be able to work around 
in Samba.

>   no - do not propagate sharemodes across all GPFS nodes. This should only
> be used if the GPFS file system is exclusively exported by Samba. Access by
> local unix application or NFS exports could lead to corrupted files.

Sharemodes are less important for data integrity than gpfs:leases, but 
there are still necessary to get full protection.

> [2012/05/11 11:29:41.979668, 10] modules/gpfs.c:77(set_gpfs_sharemode)
>    am=20089, allow=1, sa=3, deny=0
> [2012/05/11 11:29:41.979722, 10] modules/gpfs.c:87(set_gpfs_sharemode)
>    gpfs_set_share failed: Operation not
> permitted                                                           - why
> it goes whong here??????

> [2012/05/11 11:29:41.979836, 10] modules/gpfs.c:68(set_gpfs_sharemode)
>    special case am=no_access:0
> [2012/05/11 11:29:41.979879, 10] modules/gpfs.c:77(set_gpfs_sharemode)
>    am=0, allow=0, sa=0, deny=0
> [2012/05/11 11:29:41.979927, 10] modules/gpfs.c:87(set_gpfs_sharemode)
>    gpfs_set_share failed: Operation not permitted
> [2012/05/11 11:29:41.979971, 10]

Yes, those are are definitely related to the problem you are seeing.


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