[Gluster-devel] Nameless lookup in meta namespace

[Ravishankar N]

On 08/12/2016 11:29 AM, Mohammed Rafi K C wrote:
> Hi,
>
> As you may probably know meta xlators provide a /proc kind of virtual
> name space that can be used to get meta data information for mount
> process. We are trying to enhance the meta xlator to support more
> features and to support other protocols.
>
> Currently meta generate gfid by its own and store it to the inode. But
> when a graph switch happens fuse send a nameless lookup with a fresh
> inode from the new graph to resolve the gfid. But meta doesn't know
> about the gfid even though it generated it, because all the information
> are stored in inode_ctx of previous inode. So the nameless lookup will fail.
Can we create a .glusterfs/.meta on the bricks with a fixed gfid (like 
.trashcan does)?
We shouldn't allow any operations on it though.

-Ravi
>
> Basically we need a way to resolve gfid from meta xlators. Or otherwise
> as meta xlators provide meta data of process, we can restrict the access
> to per graph basis. If a graph change happens , we can treat it as the
> directory as deleted and recreated with different gfid. We have to
> access it again to get information from new graph.
>
> Thoughts?
>
>
> Regards!
>
> Rafi KC
>
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