svc: Change svc_sock_received to svc_xprt_received and export it

All fields touched by svc_sock_received are now transport independent.
Change it to use svc_xprt directly. This function is called from
transport dependent code, so export it.

Update the comment to clearly state the rules for calling this function.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

2 files changed, 25 insertions, 23 deletions

diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 1b8c596b1177..936e0dc52fcc 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -62,8 +62,8 @@ void	svc_unreg_xprt_class(struct svc_xprt_class *);
 void    svc_xprt_init(struct svc_xprt_class *, struct svc_xprt *,
                       struct svc_serv *);
 int     svc_create_xprt(struct svc_serv *, char *, unsigned short, int);
+void    svc_xprt_received(struct svc_xprt *);
 void    svc_xprt_put(struct svc_xprt *xprt);
-
 static inline void svc_xprt_get(struct svc_xprt *xprt)
 {
         kref_get(&xprt->xpt_ref);
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 2016d9c63f88..5fb537e4d63b 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -325,19 +325,21 @@ svc_sock_dequeue(struct svc_pool *pool)
 }
 
 /*
- * Having read something from a socket, check whether it
- * needs to be re-enqueued.
- * Note: XPT_DATA only gets cleared when a read-attempt finds
- * no (or insufficient) data.
+ * svc_xprt_received conditionally queues the transport for processing
+ * by another thread. The caller must hold the XPT_BUSY bit and must
+ * not thereafter touch transport data.
+ *
+ * Note: XPT_DATA only gets cleared when a read-attempt finds no (or
+ * insufficient) data.
  */
-static inline void
-svc_sock_received(struct svc_sock *svsk)
+void svc_xprt_received(struct svc_xprt *xprt)
 {
-        svsk->sk_xprt.xpt_pool = NULL;
-        clear_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags);
-        svc_xprt_enqueue(&svsk->sk_xprt);
+        BUG_ON(!test_bit(XPT_BUSY, &xprt->xpt_flags));
+        xprt->xpt_pool = NULL;
+        clear_bit(XPT_BUSY, &xprt->xpt_flags);
+        svc_xprt_enqueue(xprt);
 }
-
+EXPORT_SYMBOL_GPL(svc_xprt_received);
 
 /**
  * svc_reserve - change the space reserved for the reply to a request.
@@ -766,7 +768,7 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)
                                 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
 
         if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) {
-                svc_sock_received(svsk);
+                svc_xprt_received(&svsk->sk_xprt);
                 return svc_deferred_recv(rqstp);
         }
 
@@ -783,7 +785,7 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)
                         dprintk("svc: recvfrom returned error %d\n", -err);
                         set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
                 }
-                svc_sock_received(svsk);
+                svc_xprt_received(&svsk->sk_xprt);
                 return -EAGAIN;
         }
         rqstp->rq_addrlen = sizeof(rqstp->rq_addr);
@@ -798,7 +800,7 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)
         /*
          * Maybe more packets - kick another thread ASAP.
          */
-        svc_sock_received(svsk);
+        svc_xprt_received(&svsk->sk_xprt);
 
         len  = skb->len - sizeof(struct udphdr);
         rqstp->rq_arg.len = len;
@@ -1104,7 +1106,7 @@ static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
         }
         memcpy(&newsvsk->sk_local, sin, slen);
 
-        svc_sock_received(newsvsk);
+        svc_xprt_received(&newsvsk->sk_xprt);
 
         if (serv->sv_stats)
                 serv->sv_stats->nettcpconn++;
@@ -1134,7 +1136,7 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp)
                 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
 
         if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) {
-                svc_sock_received(svsk);
+                svc_xprt_received(&svsk->sk_xprt);
                 return svc_deferred_recv(rqstp);
         }
 
@@ -1174,7 +1176,7 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp)
                 if (len < want) {
                         dprintk("svc: short recvfrom while reading record length (%d of %lu)\n",
                                 len, want);
-                        svc_sock_received(svsk);
+                        svc_xprt_received(&svsk->sk_xprt);
                         return -EAGAIN; /* record header not complete */
                 }
 
@@ -1210,7 +1212,7 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp)
         if (len < svsk->sk_reclen) {
                 dprintk("svc: incomplete TCP record (%d of %d)\n",
                         len, svsk->sk_reclen);
-                svc_sock_received(svsk);
+                svc_xprt_received(&svsk->sk_xprt);
                 return -EAGAIN; /* record not complete */
         }
         len = svsk->sk_reclen;
@@ -1250,7 +1252,7 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp)
         svsk->sk_reclen = 0;
         svsk->sk_tcplen = 0;
 
-        svc_sock_received(svsk);
+        svc_xprt_received(&svsk->sk_xprt);
         if (serv->sv_stats)
                 serv->sv_stats->nettcpcnt++;
 
@@ -1263,7 +1265,7 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp)
  error:
         if (len == -EAGAIN) {
                 dprintk("RPC: TCP recvfrom got EAGAIN\n");
-                svc_sock_received(svsk);
+                svc_xprt_received(&svsk->sk_xprt);
         } else {
                 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
                        svsk->sk_xprt.xpt_server->sv_name, -len);
@@ -1590,7 +1592,7 @@ svc_recv(struct svc_rqst *rqstp, long timeout)
                         __module_get(newxpt->xpt_class->xcl_owner);
                         svc_check_conn_limits(svsk->sk_xprt.xpt_server);
                 }
-                svc_sock_received(svsk);
+                svc_xprt_received(&svsk->sk_xprt);
         } else {
                 dprintk("svc: server %p, pool %u, socket %p, inuse=%d\n",
                         rqstp, pool->sp_id, svsk,
@@ -1809,7 +1811,7 @@ int svc_addsock(struct svc_serv *serv,
         else {
                 svsk = svc_setup_socket(serv, so, &err, SVC_SOCK_DEFAULTS);
                 if (svsk) {
-                        svc_sock_received(svsk);
+                        svc_xprt_received(&svsk->sk_xprt);
                         err = 0;
                 }
         }
@@ -1865,7 +1867,7 @@ static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
         }
 
         if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
-                svc_sock_received(svsk);
+                svc_xprt_received(&svsk->sk_xprt);
                 return (struct svc_xprt *)svsk;
         }