svc: Add /proc/sys/sunrpc/transport files

Add a file that when read lists the set of registered svc
transports.

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>

1 files changed, 28 insertions, 0 deletions

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 000c7dc3b82c..2e5b92ae24ed 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -112,6 +112,34 @@ void svc_unreg_xprt_class(struct svc_xprt_class *xcl)
 }
 EXPORT_SYMBOL_GPL(svc_unreg_xprt_class);
 
+/*
+ * Format the transport list for printing
+ */
+int svc_print_xprts(char *buf, int maxlen)
+{
+        struct list_head *le;
+        char tmpstr[80];
+        int len = 0;
+        buf[0] = '\0';
+
+        spin_lock(&svc_xprt_class_lock);
+        list_for_each(le, &svc_xprt_class_list) {
+                int slen;
+                struct svc_xprt_class *xcl =
+                        list_entry(le, struct svc_xprt_class, xcl_list);
+
+                sprintf(tmpstr, "%s %d\n", xcl->xcl_name, xcl->xcl_max_payload);
+                slen = strlen(tmpstr);
+                if (len + slen > maxlen)
+                        break;
+                len += slen;
+                strcat(buf, tmpstr);
+        }
+        spin_unlock(&svc_xprt_class_lock);
+
+        return len;
+}
+
 static void svc_xprt_free(struct kref *kref)
 {
         struct svc_xprt *xprt =