iscsi: use IP_FREEBIND socket option

Use IP_FREEBIND socket option so that iscsi portal configuration with
explicit IP addresses can happen during boot, before network interfaces
have been assigned IPs.

This is especially important on systemd based Linux boxes where system
boot happens asynchronously and non-trivial configuration must be done
to get targetcli.service to start synchronously after the network is
configured.

Reference:
http://lists.fedoraproject.org/pipermail/devel/2011-October/158025.html

Signed-off-by: Dax Kelson <dkelson@gurulabs.com>
Cc: "Nicholas A. Bellinger" <nab@linux-iscsi.org>
Cc: "Andy Grover" <agrover@redhat.com>
Cc: "Lennart Poettering" <lennart@poettering.net>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index ec47a7c5966ef2438765cf2c658d46b0c9b7181a..38cb7ce8469ed36084eb739bd7336f4376f03cbd 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -842,6 +842,14 @@ int iscsi_target_setup_login_socket(
                goto fail;
        }
 
+       ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
+                       (char *)&opt, sizeof(opt));
+       if (ret < 0) {
+               pr_err("kernel_setsockopt() for IP_FREEBIND"
+                       " failed\n");
+               goto fail;
+       }
+
        ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
        if (ret < 0) {
                pr_err("kernel_bind() failed: %d\n", ret);