[Gluster-devel] Nameless lookup in meta namespace

[Niels de Vos]

On Fri, Aug 12, 2016 at 11:29:34AM +0530, 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.
> 
> 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?

How about taking the path+filename in the meta-xlator and generate the
GFID based on that? meta should not need to manage hardlinks, so there
wont be multuple filenames for the same GFID.

Niels
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