1 files changed, 104 insertions, 30 deletions

diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 5ed8931dfe98..952f206ff307 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
 
@@ -486,6 +487,10 @@ svc_destroy(struct svc_serv *serv)
         if (svc_serv_is_pooled(serv))
                 svc_pool_map_put();
 
+#if defined(CONFIG_NFS_V4_1)
+        svc_sock_destroy(serv->bc_xprt);
+#endif /* CONFIG_NFS_V4_1 */
+
         svc_unregister(serv);
         kfree(serv->sv_pools);
         kfree(serv);
@@ -970,20 +975,18 @@ svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
 }
 
 /*
- * Process the RPC request.
+ * Common routine for processing the RPC request.
  */
-int
-svc_process(struct svc_rqst *rqstp)
+static int
+svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
 {
         struct svc_program      *progp;
         struct svc_version      *versp = NULL;  /* compiler food */
         struct svc_procedure    *procp = NULL;
-        struct kvec *           argv = &rqstp->rq_arg.head[0];
-        struct kvec *           resv = &rqstp->rq_res.head[0];
         struct svc_serv         *serv = rqstp->rq_server;
         kxdrproc_t              xdr;
         __be32                  *statp;
-        u32                     dir, prog, vers, proc;
+        u32                     prog, vers, proc;
         __be32                  auth_stat, rpc_stat;
         int                     auth_res;
         __be32                  *reply_statp;
@@ -993,19 +996,6 @@ svc_process(struct svc_rqst *rqstp)
         if (argv->iov_len < 6*4)
                 goto err_short_len;
 
-        /* setup response xdr_buf.
-         * Initially it has just one page
-         */
-        rqstp->rq_resused = 1;
-        resv->iov_base = page_address(rqstp->rq_respages[0]);
-        resv->iov_len = 0;
-        rqstp->rq_res.pages = rqstp->rq_respages + 1;
-        rqstp->rq_res.len = 0;
-        rqstp->rq_res.page_base = 0;
-        rqstp->rq_res.page_len = 0;
-        rqstp->rq_res.buflen = PAGE_SIZE;
-        rqstp->rq_res.tail[0].iov_base = NULL;
-        rqstp->rq_res.tail[0].iov_len = 0;
         /* Will be turned off only in gss privacy case: */
         rqstp->rq_splice_ok = 1;
         /* Will be turned off only when NFSv4 Sessions are used */
@@ -1014,17 +1004,13 @@ svc_process(struct svc_rqst *rqstp)
         /* Setup reply header */
         rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
 
-        rqstp->rq_xid = svc_getu32(argv);
         svc_putu32(resv, rqstp->rq_xid);
 
-        dir  = svc_getnl(argv);
         vers = svc_getnl(argv);
 
         /* First words of reply: */
         svc_putnl(resv, 1);             /* REPLY */
 
-        if (dir != 0)           /* direction != CALL */
-                goto err_bad_dir;
         if (vers != 2)          /* RPC version number */
                 goto err_bad_rpc;
 
@@ -1147,7 +1133,7 @@ svc_process(struct svc_rqst *rqstp)
  sendit:
         if (svc_authorise(rqstp))
                 goto dropit;
-        return svc_send(rqstp);
+        return 1;               /* Caller can now send it */
 
  dropit:
         svc_authorise(rqstp);   /* doesn't hurt to call this twice */
@@ -1161,12 +1147,6 @@ err_short_len:
 
         goto dropit;                    /* drop request */
 
-err_bad_dir:
-        svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
-
-        serv->sv_stats->rpcbadfmt++;
-        goto dropit;                    /* drop request */
-
 err_bad_rpc:
         serv->sv_stats->rpcbadfmt++;
         svc_putnl(resv, 1);     /* REJECT */
@@ -1220,6 +1200,100 @@ err_bad:
 EXPORT_SYMBOL_GPL(svc_process);
 
 /*
+ * Process the RPC request.
+ */
+int
+svc_process(struct svc_rqst *rqstp)
+{
+        struct kvec             *argv = &rqstp->rq_arg.head[0];
+        struct kvec             *resv = &rqstp->rq_res.head[0];
+        struct svc_serv         *serv = rqstp->rq_server;
+        u32                     dir;
+        int                     error;
+
+        /*
+         * Setup response xdr_buf.
+         * Initially it has just one page
+         */
+        rqstp->rq_resused = 1;
+        resv->iov_base = page_address(rqstp->rq_respages[0]);
+        resv->iov_len = 0;
+        rqstp->rq_res.pages = rqstp->rq_respages + 1;
+        rqstp->rq_res.len = 0;
+        rqstp->rq_res.page_base = 0;
+        rqstp->rq_res.page_len = 0;
+        rqstp->rq_res.buflen = PAGE_SIZE;
+        rqstp->rq_res.tail[0].iov_base = NULL;
+        rqstp->rq_res.tail[0].iov_len = 0;
+
+        rqstp->rq_xid = svc_getu32(argv);
+
+        dir  = svc_getnl(argv);
+        if (dir != 0) {
+                /* direction != CALL */
+                svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
+                serv->sv_stats->rpcbadfmt++;
+                svc_drop(rqstp);
+                return 0;
+        }
+
+        error = svc_process_common(rqstp, argv, resv);
+        if (error <= 0)
+                return error;
+
+        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_xprt = serv->bc_xprt;
+        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.
  */
 u32 svc_max_payload(const struct svc_rqst *rqstp)