SUNRPC: Add srcaddr as a file in sysfs

I don't support changing it right now, but it could be useful
information for clients with multiple network cards.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/net/sunrpc/sysfs.c b/net/sunrpc/sysfs.c
index 64da3bfd28e6c2ab30e51b2459dc3bb0f22f2ce6..2e7a53504974e5a36f61c80bc93f9c123828d877 100644 (file)
--- a/net/sunrpc/sysfs.c
+++ b/net/sunrpc/sysfs.c
@@ -100,6 +100,28 @@ static ssize_t rpc_sysfs_xprt_dstaddr_show(struct kobject *kobj,
        return ret + 1;
 }
 
+static ssize_t rpc_sysfs_xprt_srcaddr_show(struct kobject *kobj,
+                                          struct kobj_attribute *attr,
+                                          char *buf)
+{
+       struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
+       struct sockaddr_storage saddr;
+       struct sock_xprt *sock;
+       ssize_t ret = -1;
+
+       if (!xprt)
+               return 0;
+
+       sock = container_of(xprt, struct sock_xprt, xprt);
+       if (kernel_getsockname(sock->sock, (struct sockaddr *)&saddr) < 0)
+               goto out;
+
+       ret = sprintf(buf, "%pISc\n", &saddr);
+out:
+       xprt_put(xprt);
+       return ret + 1;
+}
+
 static ssize_t rpc_sysfs_xprt_info_show(struct kobject *kobj,
                                        struct kobj_attribute *attr,
                                        char *buf)
@@ -376,6 +398,9 @@ static const void *rpc_sysfs_xprt_namespace(struct kobject *kobj)
 static struct kobj_attribute rpc_sysfs_xprt_dstaddr = __ATTR(dstaddr,
        0644, rpc_sysfs_xprt_dstaddr_show, rpc_sysfs_xprt_dstaddr_store);
 
+static struct kobj_attribute rpc_sysfs_xprt_srcaddr = __ATTR(srcaddr,
+       0644, rpc_sysfs_xprt_srcaddr_show, NULL);
+
 static struct kobj_attribute rpc_sysfs_xprt_info = __ATTR(xprt_info,
        0444, rpc_sysfs_xprt_info_show, NULL);
 
@@ -384,6 +409,7 @@ static struct kobj_attribute rpc_sysfs_xprt_change_state = __ATTR(xprt_state,
 
 static struct attribute *rpc_sysfs_xprt_attrs[] = {
        &rpc_sysfs_xprt_dstaddr.attr,
+       &rpc_sysfs_xprt_srcaddr.attr,
        &rpc_sysfs_xprt_info.attr,
        &rpc_sysfs_xprt_change_state.attr,
        NULL,