[Gluster-users] GlusterFS extended attributes, "system" namespace

Amar Tumballi amarts at redhat.com
Thu Sep 5 05:18:13 UTC 2013

On 08/28/2013 11:15 PM, Iain Buchanan wrote:
> Hi,
> I'm running GlusterFS 3.3.2 and I'm having trouble getting geo-replication to work.  I think it is a problem with extended attributes.  I'll using ssh with a normal user to perform the replication.
> On the server log in /var/log/glusterfs/geo-replication/VOLNAME/ssh….log I'm getting an error "ReceClient: call …:…:… (xtime) failed on peer with OSError".  On the replication target I'm getting the same error, but with a stack trace leading back to where it tries to set extended attributes in the Python replication code.  It appears to be trying to get the attribute "system.glusterfs.xyz.xtime" at line 365 of /usr/lib/glusterfs/glusterfs/python/syncdaemon/resource.py: "Xattr.lgetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'xtime')], 8))".
> I don't know anything about extended attributes, but I can't get anything in the "system" namespace manually, even running as root - e.g.
> 	touch a
> 	getfattr -n system.test a
> The above returns "Operation not supported" rather than "No such attribute".  The "user" and "trusted" namespace work fine - this is on ext3 with user_xattr set in the mount options, and also on the server (ext4).
Yes, 'system' is not allowed to be used by a process.
> On the server side I can see files have things set in the "trusted" namespace (e.g. with "getfattr -m - filename").
> Should the setting of GX_NSPACE set the namespace to be "system" for non-root or should it always be "trusted"? (line 248 in resource.py)  If I force it to be "trusted" it seems to get further (I get occasional "Operation not permitted" lines, but I think this is file permission related).
Looks like a bug. Please change 'system' to 'user' in resource.py file, 
and see if it works.


> Iain
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