[10/11] iscsi: make session and connection lists per-net

Message ID	20230506232930.195451-11-cleech@redhat.com (mailing list archive)
State	Changes Requested
Headers	show Return-Path: <linux-scsi-owner@vger.kernel.org> From: Chris Leech <cleech@redhat.com> To: Lee Duncan <lduncan@suse.com>, linux-scsi@vger.kernel.org, open-iscsi@googlegroups.com, netdev@vger.kernel.org Cc: Chris Leech <cleech@redhat.com> Subject: [PATCH 10/11] iscsi: make session and connection lists per-net Date: Sat, 6 May 2023 16:29:29 -0700 Message-Id: <20230506232930.195451-11-cleech@redhat.com> In-Reply-To: <20230506232930.195451-1-cleech@redhat.com> References: <20230506232930.195451-1-cleech@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Make iscsid-kernel communications namespace-aware \| expand [v2,00/11] Make iscsid-kernel communications namespace-aware [01/11] iscsi: create per-net iscsi netlink kernel sockets [02/11] iscsi: associate endpoints with a host [03/11] iscsi: sysfs filtering by network namespace [04/11] iscsi: make all iSCSI netlink multicast namespace aware [05/11] iscsi: check net namespace for all iscsi lookup [06/11] iscsi: set netns for tcp and iser hosts [07/11] iscsi: convert flashnode devices from bus to class [08/11] iscsi: rename iscsi_bus_flash_* to iscsi_flash_* [09/11] iscsi: filter flashnode sysfs by net namespace [10/11] iscsi: make session and connection lists per-net [11/11] iscsi: force destroy sesions when a network namespace exits

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index cd3228293a64..15d28186996d 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -1755,17 +1755,16 @@ static DECLARE_TRANSPORT_CLASS_NS(iscsi_connection_class, struct iscsi_net { struct sock *nls; + spinlock_t sesslock; + struct list_head sesslist; + spinlock_t connlock; + struct list_head connlist; + struct list_head connlist_err; }; static int iscsi_net_id __read_mostly; static DEFINE_MUTEX(rx_queue_mutex); -static LIST_HEAD(sesslist); -static DEFINE_SPINLOCK(sesslock); -static LIST_HEAD(connlist); -static LIST_HEAD(connlist_err); -static DEFINE_SPINLOCK(connlock); - static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) { struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); @@ -1780,19 +1779,18 @@ static struct iscsi_cls_session *iscsi_session_lookup(struct net *net, { unsigned long flags; struct iscsi_cls_session *sess; - struct net *ns; + struct iscsi_net *isn; - spin_lock_irqsave(&sesslock, flags); - list_for_each_entry(sess, &sesslist, sess_list) { + isn = net_generic(net, iscsi_net_id); + + spin_lock_irqsave(&isn->sesslock, flags); + list_for_each_entry(sess, &isn->sesslist, sess_list) { if (sess->sid == sid) { - ns = iscsi_sess_net(sess); - if (ns != net) - continue; - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); return sess; } } - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); return NULL; } @@ -1804,19 +1802,18 @@ static struct iscsi_cls_conn *iscsi_conn_lookup(struct net *net, uint32_t sid, { unsigned long flags; struct iscsi_cls_conn *conn; - struct net *ns; + struct iscsi_net *isn; - spin_lock_irqsave(&connlock, flags); - list_for_each_entry(conn, &connlist, conn_list) { + isn = net_generic(net, iscsi_net_id); + + spin_lock_irqsave(&isn->connlock, flags); + list_for_each_entry(conn, &isn->connlist, conn_list) { if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { - ns = iscsi_conn_net(conn); - if (ns != net) - continue; - spin_unlock_irqrestore(&connlock, flags); + spin_unlock_irqrestore(&isn->connlock, flags); return conn; } } - spin_unlock_irqrestore(&connlock, flags); + spin_unlock_irqrestore(&isn->connlock, flags); return NULL; } @@ -2228,6 +2225,9 @@ EXPORT_SYMBOL_GPL(iscsi_alloc_session); int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) { struct Scsi_Host *shost = iscsi_session_to_shost(session); + struct iscsi_cls_host *ihost = shost->shost_data; + struct net *net = iscsi_host_net(ihost); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); unsigned long flags; int id = 0; int err; @@ -2271,9 +2271,9 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) goto release_dev; } - spin_lock_irqsave(&sesslock, flags); - list_add(&session->sess_list, &sesslist); - spin_unlock_irqrestore(&sesslock, flags); + spin_lock_irqsave(&isn->sesslock, flags); + list_add(&session->sess_list, &isn->sesslist); + spin_unlock_irqrestore(&isn->sesslock, flags); iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n"); @@ -2343,15 +2343,17 @@ static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) void iscsi_remove_session(struct iscsi_cls_session *session) { + struct net *net = iscsi_sess_net(session); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); unsigned long flags; int err; ISCSI_DBG_TRANS_SESSION(session, "Removing session\n"); - spin_lock_irqsave(&sesslock, flags); + spin_lock_irqsave(&isn->sesslock, flags); if (!list_empty(&session->sess_list)) list_del(&session->sess_list); - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); if (!cancel_work_sync(&session->block_work)) cancel_delayed_work_sync(&session->recovery_work); @@ -2562,20 +2564,22 @@ static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data) void iscsi_force_destroy_session(struct iscsi_cls_session *session) { struct iscsi_transport *transport = session->transport; + struct net *net = iscsi_sess_net(session); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); unsigned long flags; WARN_ON_ONCE(system_state == SYSTEM_RUNNING); - spin_lock_irqsave(&sesslock, flags); + spin_lock_irqsave(&isn->sesslock, flags); if (list_empty(&session->sess_list)) { - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); /* * Conn/ep is already freed. Session is being torn down via * async path. For shutdown we don't care about it so return. */ return; } - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); device_for_each_child(&session->dev, NULL, iscsi_iter_force_destroy_conn_fn); @@ -2646,6 +2650,8 @@ int iscsi_add_conn(struct iscsi_cls_conn *conn) int err; unsigned long flags; struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent); + struct net *net = iscsi_sess_net(session); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); err = device_add(&conn->dev); if (err) { @@ -2661,9 +2667,9 @@ int iscsi_add_conn(struct iscsi_cls_conn *conn) return err; } - spin_lock_irqsave(&connlock, flags); - list_add(&conn->conn_list, &connlist); - spin_unlock_irqrestore(&connlock, flags); + spin_lock_irqsave(&isn->connlock, flags); + list_add(&conn->conn_list, &isn->connlist); + spin_unlock_irqrestore(&isn->connlock, flags); return 0; } @@ -2678,11 +2684,14 @@ EXPORT_SYMBOL_GPL(iscsi_add_conn); */ void iscsi_remove_conn(struct iscsi_cls_conn *conn) { + struct net *net = iscsi_conn_net(conn); + struct iscsi_net *isn = net_generic(net, iscsi_net_id); + unsigned long flags; - spin_lock_irqsave(&connlock, flags); + spin_lock_irqsave(&isn->connlock, flags); list_del(&conn->conn_list); - spin_unlock_irqrestore(&connlock, flags); + spin_unlock_irqrestore(&isn->connlock, flags); transport_unregister_device(&conn->dev); device_del(&conn->dev); @@ -3466,20 +3475,21 @@ iscsi_set_path(struct net *net, struct iscsi_transport *transport, return err; } -static int iscsi_session_has_conns(int sid) +static int iscsi_session_has_conns(struct net *net, int sid) { + struct iscsi_net *isn = net_generic(net, iscsi_net_id); struct iscsi_cls_conn *conn; unsigned long flags; int found = 0; - spin_lock_irqsave(&connlock, flags); - list_for_each_entry(conn, &connlist, conn_list) { + spin_lock_irqsave(&isn->connlock, flags); + list_for_each_entry(conn, &isn->connlist, conn_list) { if (iscsi_conn_get_sid(conn) == sid) { found = 1; break; } } - spin_unlock_irqrestore(&connlock, flags); + spin_unlock_irqrestore(&isn->connlock, flags); return found; } @@ -4192,7 +4202,7 @@ iscsi_if_recv_msg(struct net *net, struct sk_buff *skb, session = iscsi_session_lookup(net, ev->u.d_session.sid); if (!session) err = -EINVAL; - else if (iscsi_session_has_conns(ev->u.d_session.sid)) + else if (iscsi_session_has_conns(net, ev->u.d_session.sid)) err = -EBUSY; else transport->destroy_session(session); @@ -4201,15 +4211,16 @@ iscsi_if_recv_msg(struct net *net, struct sk_buff *skb, session = iscsi_session_lookup(net, ev->u.d_session.sid); if (!session) err = -EINVAL; - else if (iscsi_session_has_conns(ev->u.d_session.sid)) + else if (iscsi_session_has_conns(net, ev->u.d_session.sid)) err = -EBUSY; else { + struct iscsi_net *isn = net_generic(net, iscsi_net_id); unsigned long flags; /* Prevent this session from being found again */ - spin_lock_irqsave(&sesslock, flags); + spin_lock_irqsave(&isn->sesslock, flags); list_del_init(&session->sess_list); - spin_unlock_irqrestore(&sesslock, flags); + spin_unlock_irqrestore(&isn->sesslock, flags); queue_work(system_unbound_wq, &session->destroy_work); } @@ -5211,6 +5222,13 @@ static int __net_init iscsi_net_init(struct net *net) if (!nls) return -ENOMEM; isn = net_generic(net, iscsi_net_id); + + INIT_LIST_HEAD(&isn->sesslist); + spin_lock_init(&isn->sesslock); + INIT_LIST_HEAD(&isn->connlist); + INIT_LIST_HEAD(&isn->connlist_err); + spin_lock_init(&isn->connlock); + isn->nls = nls; return 0; }

[10/11] iscsi: make session and connection lists per-net

Commit Message

Comments

Patch