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Message-Id: <1431555167-23995-2-git-send-email-cleech@redhat.com>
Date: Wed, 13 May 2015 15:12:44 -0700
From: Chris Leech <cleech@...hat.com>
To: <open-iscsi@...glegroups.com>, <linux-scsi@...r.kernel.org>,
netdev@...r.kernel.org
Subject: [RFC PATCH 1/4] iscsi: create per-net iscsi nl kernel sockets
Prepare iSCSI netlink to operate in multiple namespaces.
---
drivers/scsi/scsi_transport_iscsi.c | 67 +++++++++++++++++++++++++++++++------
1 file changed, 57 insertions(+), 10 deletions(-)
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 67d43e3..88a3347 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -26,6 +26,8 @@
#include <linux/bsg-lib.h>
#include <linux/idr.h>
#include <net/tcp.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
@@ -1606,7 +1608,11 @@ static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
NULL,
NULL);
-static struct sock *nls;
+struct iscsi_net {
+ struct sock *nls;
+};
+
+static int iscsi_net_id __read_mostly;
static DEFINE_MUTEX(rx_queue_mutex);
static LIST_HEAD(sesslist);
@@ -2338,11 +2344,23 @@ iscsi_if_transport_lookup(struct iscsi_transport *tt)
}
static int
-iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
+iscsi_multicast_netns(struct net *net, struct sk_buff *skb,
+ uint32_t group, gfp_t gfp)
{
+ struct sock *nls;
+ struct iscsi_net *isn;
+
+ isn = net_generic(net, iscsi_net_id);
+ nls = isn->nls;
return nlmsg_multicast(nls, skb, 0, group, gfp);
}
+static int
+iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
+{
+ return iscsi_multicast_netns(&init_net, skb, group, gfp);
+}
+
int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
char *data, uint32_t data_size)
{
@@ -4505,13 +4523,42 @@ int iscsi_unregister_transport(struct iscsi_transport *tt)
}
EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
-static __init int iscsi_transport_init(void)
+static int __net_init iscsi_net_init(struct net *net)
{
- int err;
+ struct sock *nls;
+ struct iscsi_net *isn;
struct netlink_kernel_cfg cfg = {
.groups = 1,
.input = iscsi_if_rx,
};
+
+ nls = netlink_kernel_create(net, NETLINK_ISCSI, &cfg);
+ if (!nls)
+ return -ENOMEM;
+ isn = net_generic(net, iscsi_net_id);
+ isn->nls = nls;
+ return 0;
+}
+
+static void __net_exit iscsi_net_exit(struct net *net)
+{
+ struct iscsi_net *isn;
+
+ isn = net_generic(net, iscsi_net_id);
+ netlink_kernel_release(isn->nls);
+ isn->nls = NULL;
+}
+
+static struct pernet_operations iscsi_net_ops = {
+ .init = iscsi_net_init,
+ .exit = iscsi_net_exit,
+ .id = &iscsi_net_id,
+ .size = sizeof(struct iscsi_net),
+};
+
+static __init int iscsi_transport_init(void)
+{
+ int err;
printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
ISCSI_TRANSPORT_VERSION);
@@ -4545,8 +4592,8 @@ static __init int iscsi_transport_init(void)
if (err)
goto unregister_session_class;
- nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
- if (!nls) {
+ err = register_pernet_subsys(&iscsi_net_ops);
+ if (err) {
err = -ENOBUFS;
goto unregister_flashnode_bus;
}
@@ -4554,13 +4601,13 @@ static __init int iscsi_transport_init(void)
iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
if (!iscsi_eh_timer_workq) {
err = -ENOMEM;
- goto release_nls;
+ goto unregister_pernet_subsys;
}
return 0;
-release_nls:
- netlink_kernel_release(nls);
+unregister_pernet_subsys:
+ unregister_pernet_subsys(&iscsi_net_ops);
unregister_flashnode_bus:
bus_unregister(&iscsi_flashnode_bus);
unregister_session_class:
@@ -4581,7 +4628,7 @@ unregister_transport_class:
static void __exit iscsi_transport_exit(void)
{
destroy_workqueue(iscsi_eh_timer_workq);
- netlink_kernel_release(nls);
+ unregister_pernet_subsys(&iscsi_net_ops);
bus_unregister(&iscsi_flashnode_bus);
transport_class_unregister(&iscsi_connection_class);
transport_class_unregister(&iscsi_session_class);
--
2.1.0
--
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