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authorRicardo Labiaga <Ricardo.Labiaga@netapp.com>2009-04-01 09:23:07 -0400
committerBenny Halevy <bhalevy@panasas.com>2009-06-17 14:11:29 -0700
commit4d6bbb6233c9cf23822a2f66f8470c9f40854b77 (patch)
tree0779a7173d2d33adc83162596e64f5636e9f7d5c /net/sunrpc
parent1cad7ea6fe98dc414bd3df55275c147bd15ebf97 (diff)
downloadlinux-4d6bbb6233c9cf23822a2f66f8470c9f40854b77.tar.bz2
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>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/svc.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index bfda66db2f4f..06b52e465f47 100644
--- 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.
*/