[03/11] iscsi: sysfs filtering by network namespace

Commit Message

Chris Leech May 6, 2023, 11:29 p.m. UTC

This makes the iscsi_host, iscsi_session, iscsi_connection, iscsi_iface,
and iscsi_endpoint transport class devices only visible in sysfs under a
matching network namespace.  The network namespace for all of these
objects is tracked in the iscsi_cls_host structure.

Signed-off-by: Lee Duncan <[e-mail]>
Reviewed-by: Hannes Reinecke <[e-mail]>
Signed-off-by: Chris Leech <[e-mail]>
---
 drivers/scsi/scsi_transport_iscsi.c | 127 ++++++++++++++++++++++++----
 include/scsi/scsi_transport_iscsi.h |   1 +
 2 files changed, 113 insertions(+), 15 deletions(-)

Comments

Mike Christie May 10, 2023, 7:50 p.m. UTC | #1

On 5/6/23 4:29 PM, Chris Leech wrote:
> +#define DECLARE_TRANSPORT_CLASS_NS(cls, nm, su, rm, cfg, ns, nslookup)	\
> +struct transport_class cls = {						\
> +	.class = {							\
> +		.name = nm,						\
> +		.ns_type = ns,						\
> +		.namespace = nslookup,					\
> +	},								\
> +	.setup = su,							\
> +	.remove = rm,							\
> +	.configure = cfg,						\
> +}

I think this would be in the transport class for others to use in the future
and or you want to name it differently so it doesn't clash with the future
transport class naming. Same as other places in the patch.

Patch

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 2f9348178450..814aef6da4a3 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -181,9 +181,34 @@  static void iscsi_endpoint_release(struct device *dev)
 	kfree(ep);
 }
 
+static struct net *iscsi_host_net(struct iscsi_cls_host *ihost)
+{
+	return ihost->netns;
+}
+
+static struct net *iscsi_endpoint_net(struct iscsi_endpoint *ep)
+{
+	struct Scsi_Host *shost = iscsi_endpoint_to_shost(ep);
+	struct iscsi_cls_host *ihost;
+
+	if (!shost)
+		return &init_net;
+	ihost = shost->shost_data;
+	return iscsi_host_net(ihost);
+}
+
+static const void *iscsi_endpoint_namespace(const struct device *dev)
+{
+	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
+
+	return iscsi_endpoint_net(ep);
+}
+
 static struct class iscsi_endpoint_class = {
 	.name = "iscsi_endpoint",
 	.dev_release = iscsi_endpoint_release,
+	.ns_type = &net_ns_type_operations,
+	.namespace = iscsi_endpoint_namespace,
 };
 
 static ssize_t
@@ -309,10 +334,26 @@  static void iscsi_iface_release(struct device *dev)
 	put_device(parent);
 }
 
+static struct net *iscsi_iface_net(struct iscsi_iface *iface)
+{
+	struct Scsi_Host *shost = iscsi_iface_to_shost(iface);
+	struct iscsi_cls_host *ihost = shost->shost_data;
+
+	return iscsi_host_net(ihost);
+}
+
+static const void *iscsi_iface_namespace(const struct device *dev)
+{
+	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
+
+	return iscsi_iface_net(iface);
+}
 
 static struct class iscsi_iface_class = {
 	.name = "iscsi_iface",
 	.dev_release = iscsi_iface_release,
+	.ns_type = &net_ns_type_operations,
+	.namespace = iscsi_iface_namespace,
 };
 
 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)	\
@@ -1566,6 +1607,7 @@  static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 
 	memset(ihost, 0, sizeof(*ihost));
 	mutex_init(&ihost->mutex);
+	ihost->netns = &init_net;
 
 	iscsi_bsg_host_add(shost, ihost);
 	/* ignore any bsg add error - we just can't do sgio */
@@ -1583,23 +1625,78 @@  static int iscsi_remove_host(struct transport_container *tc,
 	return 0;
 }
 
-static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
-			       "iscsi_host",
-			       iscsi_setup_host,
-			       iscsi_remove_host,
-			       NULL);
+#define DECLARE_TRANSPORT_CLASS_NS(cls, nm, su, rm, cfg, ns, nslookup)	\
+struct transport_class cls = {						\
+	.class = {							\
+		.name = nm,						\
+		.ns_type = ns,						\
+		.namespace = nslookup,					\
+	},								\
+	.setup = su,							\
+	.remove = rm,							\
+	.configure = cfg,						\
+}
 
-static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
-			       "iscsi_session",
-			       NULL,
-			       NULL,
-			       NULL);
+static const void *iscsi_host_namespace(const struct device *dev)
+{
+	struct Scsi_Host *shost = transport_class_to_shost(dev);
+	struct iscsi_cls_host *ihost = shost->shost_data;
+
+	return iscsi_host_net(ihost);
+}
+
+static DECLARE_TRANSPORT_CLASS_NS(iscsi_host_class,
+				  "iscsi_host",
+				  iscsi_setup_host,
+				  iscsi_remove_host,
+				  NULL,
+				  &net_ns_type_operations,
+				  iscsi_host_namespace);
+
+static struct net *iscsi_sess_net(struct iscsi_cls_session *cls_session)
+{
+	struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+	struct iscsi_cls_host *ihost = shost->shost_data;
+
+	return iscsi_host_net(ihost);
+}
+
+static const void *iscsi_sess_namespace(const struct device *dev)
+{
+	struct iscsi_cls_session *cls_session = transport_class_to_session(dev);
+
+	return iscsi_sess_net(cls_session);
+}
+
+static DECLARE_TRANSPORT_CLASS_NS(iscsi_session_class,
+				  "iscsi_session",
+				  NULL,
+				  NULL,
+				  NULL,
+				  &net_ns_type_operations,
+				  iscsi_sess_namespace);
+
+static struct net *iscsi_conn_net(struct iscsi_cls_conn *cls_conn)
+{
+	struct iscsi_cls_session *cls_session = iscsi_conn_to_session(cls_conn);
+
+	return iscsi_sess_net(cls_session);
+}
+
+static const void *iscsi_conn_namespace(const struct device *dev)
+{
+	struct iscsi_cls_conn *cls_conn = transport_class_to_conn(dev);
+
+	return iscsi_conn_net(cls_conn);
+}
 
-static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
-			       "iscsi_connection",
-			       NULL,
-			       NULL,
-			       NULL);
+static DECLARE_TRANSPORT_CLASS_NS(iscsi_connection_class,
+				  "iscsi_connection",
+				  NULL,
+				  NULL,
+				  NULL,
+				  &net_ns_type_operations,
+				  iscsi_conn_namespace);
 
 struct iscsi_net {
 	struct sock *nls;
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 8ade6a03f85a..d795e65a1f75 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -299,6 +299,7 @@  struct iscsi_cls_host {
 	struct request_queue *bsg_q;
 	uint32_t port_speed;
 	uint32_t port_state;
+	struct net *netns;
 };
 
 #define iscsi_job_to_shost(_job) \