nfs41: Backchannel bc_svc_process()

Implement the NFSv4.1 backchannel service.  Invokes the common callback
processing logic svc_process_common() to authenticate the call and
dispatch the appropriate NFSv4.1 XDR decoder and operation procedure.
It then invokes bc_send() to send the reply over the same connection.
bc_send() is implemented in a separate patch.

At this time there is no slot validation or reply cache handling.

[nfs41: Preallocate rpc_rqst receive buffer for handling callbacks]
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Move bc_svc_process() declaration to correct patch]
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 4a8afbd..16043c4 100644 (file)
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -419,6 +419,8 @@ int            svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
 int               svc_pool_stats_open(struct svc_serv *serv, struct file *file);
 void              svc_destroy(struct svc_serv *);
 int               svc_process(struct svc_rqst *);
+int               bc_svc_process(struct svc_serv *, struct rpc_rqst *,
+                       struct svc_rqst *);
 int               svc_register(const struct svc_serv *, const int,
                                const unsigned short, const unsigned short);
 

diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index bfda66d..06b52e4 100644 (file)
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -25,6 +25,7 @@
 #include <linux/sunrpc/stats.h>
 #include <linux/sunrpc/svcsock.h>
 #include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/bc_xprt.h>
 
 #define RPCDBG_FACILITY        RPCDBG_SVCDSP
 
@@ -1239,6 +1240,54 @@ svc_process(struct svc_rqst *rqstp)
        return svc_send(rqstp);
 }
 
+#if defined(CONFIG_NFS_V4_1)
+/*
+ * Process a backchannel RPC request that arrived over an existing
+ * outbound connection
+ */
+int
+bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
+              struct svc_rqst *rqstp)
+{
+       struct kvec     *argv = &rqstp->rq_arg.head[0];
+       struct kvec     *resv = &rqstp->rq_res.head[0];
+       int             error;
+
+       /* Build the svc_rqst used by the common processing routine */
+       rqstp->rq_xid = req->rq_xid;
+       rqstp->rq_prot = req->rq_xprt->prot;
+       rqstp->rq_server = serv;
+
+       rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
+       memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
+       memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
+       memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
+
+       /* reset result send buffer "put" position */
+       resv->iov_len = 0;
+
+       if (rqstp->rq_prot != IPPROTO_TCP) {
+               printk(KERN_ERR "No support for Non-TCP transports!\n");
+               BUG();
+       }
+
+       /*
+        * Skip the next two words because they've already been
+        * processed in the trasport
+        */
+       svc_getu32(argv);       /* XID */
+       svc_getnl(argv);        /* CALLDIR */
+
+       error = svc_process_common(rqstp, argv, resv);
+       if (error <= 0)
+               return error;
+
+       memcpy(&req->rq_snd_buf, &rqstp->rq_res, sizeof(req->rq_snd_buf));
+       return bc_send(req);
+}
+EXPORT_SYMBOL(bc_svc_process);
+#endif /* CONFIG_NFS_V4_1 */
+
 /*
  * Return (transport-specific) limit on the rpc payload.
  */