[pnfs] [PATCH 15/23] 2.6-latest pnfs client implement rpc pnfs4_read_done

[William A. (Andy) Adamson]

On 12/23/07, Benny Halevy <bhalevy at panasas.com> wrote:
>
> On Dec. 13, 2007, 22:51 +0200, andros at umich.edu wrote:
> > From: Andy Adamson <andros at umich.edu>
> >
> > pnfs4_read_done is called in the rpc_call_done path used by rpc
> communication
> > to the MDS or to a filelayout data server.
> > Switch on MDS or Data server processing on the presence of
> > nfs_read_data->ds_nfs_client.
> >
> > Signed-off by: Andy Adamson<andros at umich.edu>
> > ---
> >  fs/nfs/nfs4proc.c |   38 ++++++++++++++++++++++++++++++++++++--
> >  1 files changed, 36 insertions(+), 2 deletions(-)
> >
> > diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> > index 12368d6..c6d1bbd 100644
> > --- a/fs/nfs/nfs4proc.c
> > +++ b/fs/nfs/nfs4proc.c
> > @@ -2933,9 +2933,43 @@ static int nfs4_read_done(struct rpc_task *task,
> struct nfs_read_data *data)
> >  }
> >
> >  #ifdef CONFIG_PNFS
> > +/*
> > + * rpc_call_done callback for a read to the MDS or to a filelayout Data
> Server
> > + */
> >  static int pnfs4_read_done(struct rpc_task *task, struct nfs_read_data
> *data)
> >  {
> > -     /* XXX Needs to be implemented */
> > +     struct nfs_server *mds_svr = NFS_SERVER(data->inode);
> > +     struct nfs4_session *session = mds_svr->session;
> > +     struct nfs_client *client = mds_svr->nfs_client;
> > +     int status;
> > +
> > +     dprintk("--> %s\n", __func__);
> > +     status = task->tk_status >= 0 ? 0 : task->tk_status;
> > +
> > +     /* Is this a DS session */
> > +     if (data->ds_nfs_client) {
> > +             dprintk("%s DS read\n",__func__);
> > +             session = data->ds_nfs_client->cl_ds_session;
> > +             client = NULL; /* do not update mds lease...*/
> > +     }
> > +
> > +     nfs41_sequence_done(client, session, &data->res.seq_res, status);
> > +
> > +     /*
> > +     * Handle async errors for both data servers and MDS communication.
> > +     */
> > +
> > +     if (nfs4_async_handle_error(task, mds_svr, client) == -EAGAIN) {
> > +             rpc_restart_call(task);
> > +             dprintk("<-- %s status= %d\n", __FUNCTION__, -EAGAIN);
> > +             return -EAGAIN;
> > +     }
> > +
> > +     /* Only renew lease if this was a read call to MDS */
> > +     if (task->tk_status > 0 && !data->ds_nfs_client)
> > +             renew_lease(mds_svr, data->timestamp);
>
> How is this going to work with non-files layout drivers?


non RPC I/O doesn't call this code.


> For these data->ds_nfs_client is NULL yet it's still possible/likely
> that no I/O has been done to the MDS.
>
> _______________________________________________
> pNFS mailing list
> pNFS at linux-nfs.org
> http://linux-nfs.org/cgi-bin/mailman/listinfo/pnfs
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://linux-nfs.org/pipermail/pnfs/attachments/20071227/5d892627/attachment.htm