svc: Add svc_xprt_names service to replace svc_sock_names

[deliverable/linux.git] / net / sunrpc / svc_xprt.c

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 78359734387789c5c0ef9a47265d3cd169b1b7de..c3fb36784f3b5e2fb481dcbc6df1951a401386c6 100644 (file)
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -1014,3 +1014,38 @@ struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name,
        return found;
 }
 EXPORT_SYMBOL_GPL(svc_find_xprt);
+
+/*
+ * Format a buffer with a list of the active transports. A zero for
+ * the buflen parameter disables target buffer overflow checking.
+ */
+int svc_xprt_names(struct svc_serv *serv, char *buf, int buflen)
+{
+       struct svc_xprt *xprt;
+       char xprt_str[64];
+       int totlen = 0;
+       int len;
+
+       /* Sanity check args */
+       if (!serv)
+               return 0;
+
+       spin_lock_bh(&serv->sv_lock);
+       list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
+               len = snprintf(xprt_str, sizeof(xprt_str),
+                              "%s %d\n", xprt->xpt_class->xcl_name,
+                              svc_xprt_local_port(xprt));
+               /* If the string was truncated, replace with error string */
+               if (len >= sizeof(xprt_str))
+                       strcpy(xprt_str, "name-too-long\n");
+               /* Don't overflow buffer */
+               len = strlen(xprt_str);
+               if (buflen && (len + totlen >= buflen))
+                       break;
+               strcpy(buf+totlen, xprt_str);
+               totlen += len;
+       }
+       spin_unlock_bh(&serv->sv_lock);
+       return totlen;
+}
+EXPORT_SYMBOL_GPL(svc_xprt_names);