diff options
Diffstat (limited to 'drivers/scsi/scsi_transport_iscsi.c')
-rw-r--r-- | drivers/scsi/scsi_transport_iscsi.c | 332 |
1 files changed, 186 insertions, 146 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 5428d15f23c..0d7b4e79415 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -30,10 +30,10 @@ #include <scsi/scsi_transport_iscsi.h> #include <scsi/iscsi_if.h> -#define ISCSI_SESSION_ATTRS 15 +#define ISCSI_SESSION_ATTRS 18 #define ISCSI_CONN_ATTRS 11 #define ISCSI_HOST_ATTRS 4 -#define ISCSI_TRANSPORT_VERSION "2.0-724" +#define ISCSI_TRANSPORT_VERSION "2.0-867" struct iscsi_internal { int daemon_pid; @@ -50,6 +50,7 @@ struct iscsi_internal { }; static atomic_t iscsi_session_nr; /* sysfs session id for next new session */ +static struct workqueue_struct *iscsi_eh_timer_workq; /* * list of registered transports and lock that must @@ -115,6 +116,8 @@ static struct attribute_group iscsi_transport_group = { .attrs = iscsi_transport_attrs, }; + + static int iscsi_setup_host(struct transport_container *tc, struct device *dev, struct class_device *cdev) { @@ -124,13 +127,30 @@ static int iscsi_setup_host(struct transport_container *tc, struct device *dev, memset(ihost, 0, sizeof(*ihost)); INIT_LIST_HEAD(&ihost->sessions); mutex_init(&ihost->mutex); + + snprintf(ihost->unbind_workq_name, KOBJ_NAME_LEN, "iscsi_unbind_%d", + shost->host_no); + ihost->unbind_workq = create_singlethread_workqueue( + ihost->unbind_workq_name); + if (!ihost->unbind_workq) + return -ENOMEM; + return 0; +} + +static int iscsi_remove_host(struct transport_container *tc, struct device *dev, + struct class_device *cdev) +{ + struct Scsi_Host *shost = dev_to_shost(dev); + struct iscsi_host *ihost = shost->shost_data; + + destroy_workqueue(ihost->unbind_workq); return 0; } static DECLARE_TRANSPORT_CLASS(iscsi_host_class, "iscsi_host", iscsi_setup_host, - NULL, + iscsi_remove_host, NULL); static DECLARE_TRANSPORT_CLASS(iscsi_session_class, @@ -252,7 +272,7 @@ static void session_recovery_timedout(struct work_struct *work) void iscsi_unblock_session(struct iscsi_cls_session *session) { if (!cancel_delayed_work(&session->recovery_work)) - flush_scheduled_work(); + flush_workqueue(iscsi_eh_timer_workq); scsi_target_unblock(&session->dev); } EXPORT_SYMBOL_GPL(iscsi_unblock_session); @@ -260,11 +280,40 @@ EXPORT_SYMBOL_GPL(iscsi_unblock_session); void iscsi_block_session(struct iscsi_cls_session *session) { scsi_target_block(&session->dev); - schedule_delayed_work(&session->recovery_work, - session->recovery_tmo * HZ); + queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work, + session->recovery_tmo * HZ); } EXPORT_SYMBOL_GPL(iscsi_block_session); +static void __iscsi_unbind_session(struct work_struct *work) +{ + struct iscsi_cls_session *session = + container_of(work, struct iscsi_cls_session, + unbind_work); + struct Scsi_Host *shost = iscsi_session_to_shost(session); + struct iscsi_host *ihost = shost->shost_data; + + /* Prevent new scans and make sure scanning is not in progress */ + mutex_lock(&ihost->mutex); + if (list_empty(&session->host_list)) { + mutex_unlock(&ihost->mutex); + return; + } + list_del_init(&session->host_list); + mutex_unlock(&ihost->mutex); + + scsi_remove_target(&session->dev); + iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); +} + +static int iscsi_unbind_session(struct iscsi_cls_session *session) +{ + struct Scsi_Host *shost = iscsi_session_to_shost(session); + struct iscsi_host *ihost = shost->shost_data; + + return queue_work(ihost->unbind_workq, &session->unbind_work); +} + struct iscsi_cls_session * iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport) @@ -281,6 +330,7 @@ iscsi_alloc_session(struct Scsi_Host *shost, INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); INIT_LIST_HEAD(&session->host_list); INIT_LIST_HEAD(&session->sess_list); + INIT_WORK(&session->unbind_work, __iscsi_unbind_session); /* this is released in the dev's release function */ scsi_host_get(shost); @@ -297,6 +347,7 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) { struct Scsi_Host *shost = iscsi_session_to_shost(session); struct iscsi_host *ihost; + unsigned long flags; int err; ihost = shost->shost_data; @@ -313,9 +364,15 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) } transport_register_device(&session->dev); + spin_lock_irqsave(&sesslock, flags); + list_add(&session->sess_list, &sesslist); + spin_unlock_irqrestore(&sesslock, flags); + mutex_lock(&ihost->mutex); list_add(&session->host_list, &ihost->sessions); mutex_unlock(&ihost->mutex); + + iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); return 0; release_host: @@ -328,9 +385,10 @@ EXPORT_SYMBOL_GPL(iscsi_add_session); * iscsi_create_session - create iscsi class session * @shost: scsi host * @transport: iscsi transport + * @target_id: which target * * This can be called from a LLD or iscsi_transport. - **/ + */ struct iscsi_cls_session * iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport, @@ -350,19 +408,58 @@ iscsi_create_session(struct Scsi_Host *shost, } EXPORT_SYMBOL_GPL(iscsi_create_session); +static void iscsi_conn_release(struct device *dev) +{ + struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); + struct device *parent = conn->dev.parent; + + kfree(conn); + put_device(parent); +} + +static int iscsi_is_conn_dev(const struct device *dev) +{ + return dev->release == iscsi_conn_release; +} + +static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) +{ + if (!iscsi_is_conn_dev(dev)) + return 0; + return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); +} + void iscsi_remove_session(struct iscsi_cls_session *session) { struct Scsi_Host *shost = iscsi_session_to_shost(session); struct iscsi_host *ihost = shost->shost_data; + unsigned long flags; + int err; - if (!cancel_delayed_work(&session->recovery_work)) - flush_scheduled_work(); + spin_lock_irqsave(&sesslock, flags); + list_del(&session->sess_list); + spin_unlock_irqrestore(&sesslock, flags); - mutex_lock(&ihost->mutex); - list_del(&session->host_list); - mutex_unlock(&ihost->mutex); + /* + * If we are blocked let commands flow again. The lld or iscsi + * layer should set up the queuecommand to fail commands. + */ + iscsi_unblock_session(session); + iscsi_unbind_session(session); + /* + * If the session dropped while removing devices then we need to make + * sure it is not blocked + */ + if (!cancel_delayed_work(&session->recovery_work)) + flush_workqueue(iscsi_eh_timer_workq); + flush_workqueue(ihost->unbind_workq); - scsi_remove_target(&session->dev); + /* hw iscsi may not have removed all connections from session */ + err = device_for_each_child(&session->dev, NULL, + iscsi_iter_destroy_conn_fn); + if (err) + dev_printk(KERN_ERR, &session->dev, "iscsi: Could not delete " + "all connections for session. Error %d.\n", err); transport_unregister_device(&session->dev); device_del(&session->dev); @@ -371,9 +468,9 @@ EXPORT_SYMBOL_GPL(iscsi_remove_session); void iscsi_free_session(struct iscsi_cls_session *session) { + iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); put_device(&session->dev); } - EXPORT_SYMBOL_GPL(iscsi_free_session); /** @@ -382,7 +479,7 @@ EXPORT_SYMBOL_GPL(iscsi_free_session); * * Can be called by a LLD or iscsi_transport. There must not be * any running connections. - **/ + */ int iscsi_destroy_session(struct iscsi_cls_session *session) { iscsi_remove_session(session); @@ -391,20 +488,6 @@ int iscsi_destroy_session(struct iscsi_cls_session *session) } EXPORT_SYMBOL_GPL(iscsi_destroy_session); -static void iscsi_conn_release(struct device *dev) -{ - struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); - struct device *parent = conn->dev.parent; - - kfree(conn); - put_device(parent); -} - -static int iscsi_is_conn_dev(const struct device *dev) -{ - return dev->release == iscsi_conn_release; -} - /** * iscsi_create_conn - create iscsi class connection * @session: iscsi cls session @@ -418,12 +501,13 @@ static int iscsi_is_conn_dev(const struct device *dev) * for software iscsi we could be trying to preallocate a connection struct * in which case there could be two connection structs and cid would be * non-zero. - **/ + */ struct iscsi_cls_conn * iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) { struct iscsi_transport *transport = session->transport; struct iscsi_cls_conn *conn; + unsigned long flags; int err; conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); @@ -452,6 +536,11 @@ iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) goto release_parent_ref; } transport_register_device(&conn->dev); + + spin_lock_irqsave(&connlock, flags); + list_add(&conn->conn_list, &connlist); + conn->active = 1; + spin_unlock_irqrestore(&connlock, flags); return conn; release_parent_ref: @@ -465,17 +554,23 @@ EXPORT_SYMBOL_GPL(iscsi_create_conn); /** * iscsi_destroy_conn - destroy iscsi class connection - * @session: iscsi cls session + * @conn: iscsi cls session * * This can be called from a LLD or iscsi_transport. - **/ + */ int iscsi_destroy_conn(struct iscsi_cls_conn *conn) { + unsigned long flags; + + spin_lock_irqsave(&connlock, flags); + conn->active = 0; + list_del(&conn->conn_list); + spin_unlock_irqrestore(&connlock, flags); + transport_unregister_device(&conn->dev); device_unregister(&conn->dev); return 0; } - EXPORT_SYMBOL_GPL(iscsi_destroy_conn); /* @@ -685,132 +780,74 @@ iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) } /** - * iscsi_if_destroy_session_done - send session destr. completion event - * @conn: last connection for session - * - * This is called by HW iscsi LLDs to notify userpsace that its HW has - * removed a session. - **/ -int iscsi_if_destroy_session_done(struct iscsi_cls_conn *conn) + * iscsi_session_event - send session destr. completion event + * @session: iscsi class session + * @event: type of event + */ +int iscsi_session_event(struct iscsi_cls_session *session, + enum iscsi_uevent_e event) { struct iscsi_internal *priv; - struct iscsi_cls_session *session; struct Scsi_Host *shost; struct iscsi_uevent *ev; struct sk_buff *skb; struct nlmsghdr *nlh; - unsigned long flags; int rc, len = NLMSG_SPACE(sizeof(*ev)); - priv = iscsi_if_transport_lookup(conn->transport); + priv = iscsi_if_transport_lookup(session->transport); if (!priv) return -EINVAL; - - session = iscsi_dev_to_session(conn->dev.parent); shost = iscsi_session_to_shost(session); skb = alloc_skb(len, GFP_KERNEL); if (!skb) { - dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " - "session creation event\n"); + dev_printk(KERN_ERR, &session->dev, "Cannot notify userspace " + "of session event %u\n", event); return -ENOMEM; } nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); ev = NLMSG_DATA(nlh); - ev->transport_handle = iscsi_handle(conn->transport); - ev->type = ISCSI_KEVENT_DESTROY_SESSION; - ev->r.d_session.host_no = shost->host_no; - ev->r.d_session.sid = session->sid; - - /* - * this will occur if the daemon is not up, so we just warn - * the user and when the daemon is restarted it will handle it - */ - rc = iscsi_broadcast_skb(skb, GFP_KERNEL); - if (rc < 0) - dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " - "session destruction event. Check iscsi daemon\n"); - - spin_lock_irqsave(&sesslock, flags); - list_del(&session->sess_list); - spin_unlock_irqrestore(&sesslock, flags); + ev->transport_handle = iscsi_handle(session->transport); - spin_lock_irqsave(&connlock, flags); - conn->active = 0; - list_del(&conn->conn_list); - spin_unlock_irqrestore(&connlock, flags); - - return rc; -} -EXPORT_SYMBOL_GPL(iscsi_if_destroy_session_done); - -/** - * iscsi_if_create_session_done - send session creation completion event - * @conn: leading connection for session - * - * This is called by HW iscsi LLDs to notify userpsace that its HW has - * created a session or a existing session is back in the logged in state. - **/ -int iscsi_if_create_session_done(struct iscsi_cls_conn *conn) -{ - struct iscsi_internal *priv; - struct iscsi_cls_session *session; - struct Scsi_Host *shost; - struct iscsi_uevent *ev; - struct sk_buff *skb; - struct nlmsghdr *nlh; - unsigned long flags; - int rc, len = NLMSG_SPACE(sizeof(*ev)); - - priv = iscsi_if_transport_lookup(conn->transport); - if (!priv) + ev->type = event; + switch (event) { + case ISCSI_KEVENT_DESTROY_SESSION: + ev->r.d_session.host_no = shost->host_no; + ev->r.d_session.sid = session->sid; + break; + case ISCSI_KEVENT_CREATE_SESSION: + ev->r.c_session_ret.host_no = shost->host_no; + ev->r.c_session_ret.sid = session->sid; + break; + case ISCSI_KEVENT_UNBIND_SESSION: + ev->r.unbind_session.host_no = shost->host_no; + ev->r.unbind_session.sid = session->sid; + break; + default: + dev_printk(KERN_ERR, &session->dev, "Invalid event %u.\n", + event); + kfree_skb(skb); return -EINVAL; - - session = iscsi_dev_to_session(conn->dev.parent); - shost = iscsi_session_to_shost(session); - - skb = alloc_skb(len, GFP_KERNEL); - if (!skb) { - dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " - "session creation event\n"); - return -ENOMEM; } - nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); - ev = NLMSG_DATA(nlh); - ev->transport_handle = iscsi_handle(conn->transport); - ev->type = ISCSI_UEVENT_CREATE_SESSION; - ev->r.c_session_ret.host_no = shost->host_no; - ev->r.c_session_ret.sid = session->sid; - /* * this will occur if the daemon is not up, so we just warn * the user and when the daemon is restarted it will handle it */ rc = iscsi_broadcast_skb(skb, GFP_KERNEL); if (rc < 0) - dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " - "session creation event. Check iscsi daemon\n"); - - spin_lock_irqsave(&sesslock, flags); - list_add(&session->sess_list, &sesslist); - spin_unlock_irqrestore(&sesslock, flags); - - spin_lock_irqsave(&connlock, flags); - list_add(&conn->conn_list, &connlist); - conn->active = 1; - spin_unlock_irqrestore(&connlock, flags); + dev_printk(KERN_ERR, &session->dev, "Cannot notify userspace " + "of session event %u. Check iscsi daemon\n", event); return rc; } -EXPORT_SYMBOL_GPL(iscsi_if_create_session_done); +EXPORT_SYMBOL_GPL(iscsi_session_event); static int iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) { struct iscsi_transport *transport = priv->iscsi_transport; struct iscsi_cls_session *session; - unsigned long flags; uint32_t hostno; session = transport->create_session(transport, &priv->t, @@ -821,10 +858,6 @@ iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) if (!session) return -ENOMEM; - spin_lock_irqsave(&sesslock, flags); - list_add(&session->sess_list, &sesslist); - spin_unlock_irqrestore(&sesslock, flags); - ev->r.c_session_ret.host_no = hostno; ev->r.c_session_ret.sid = session->sid; return 0; @@ -835,7 +868,6 @@ iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) { struct iscsi_cls_conn *conn; struct iscsi_cls_session *session; - unsigned long flags; session = iscsi_session_lookup(ev->u.c_conn.sid); if (!session) { @@ -854,28 +886,17 @@ iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) ev->r.c_conn_ret.sid = session->sid; ev->r.c_conn_ret.cid = conn->cid; - - spin_lock_irqsave(&connlock, flags); - list_add(&conn->conn_list, &connlist); - conn->active = 1; - spin_unlock_irqrestore(&connlock, flags); - return 0; } static int iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) { - unsigned long flags; struct iscsi_cls_conn *conn; conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); if (!conn) return -EINVAL; - spin_lock_irqsave(&connlock, flags); - conn->active = 0; - list_del(&conn->conn_list); - spin_unlock_irqrestore(&connlock, flags); if (transport->destroy_conn) transport->destroy_conn(conn); @@ -1002,7 +1023,6 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) struct iscsi_internal *priv; struct iscsi_cls_session *session; struct iscsi_cls_conn *conn; - unsigned long flags; priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); if (!priv) @@ -1020,13 +1040,16 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) break; case ISCSI_UEVENT_DESTROY_SESSION: session = iscsi_session_lookup(ev->u.d_session.sid); - if (session) { - spin_lock_irqsave(&sesslock, flags); - list_del(&session->sess_list); - spin_unlock_irqrestore(&sesslock, flags); - + if (session) transport->destroy_session(session); - } else + else + err = -EINVAL; + break; + case ISCSI_UEVENT_UNBIND_SESSION: + session = iscsi_session_lookup(ev->u.d_session.sid); + if (session) + iscsi_unbind_session(session); + else err = -EINVAL; break; case ISCSI_UEVENT_CREATE_CONN: @@ -1179,6 +1202,8 @@ iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); +iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); +iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); #define iscsi_cdev_to_session(_cdev) \ iscsi_dev_to_session(_cdev->dev) @@ -1217,6 +1242,9 @@ iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); +iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); +iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); +iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); #define iscsi_priv_session_attr_show(field, format) \ static ssize_t \ @@ -1413,6 +1441,8 @@ iscsi_register_transport(struct iscsi_transport *tt) SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); + SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); + SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); BUG_ON(count > ISCSI_CONN_ATTRS); priv->conn_attrs[count] = NULL; @@ -1438,6 +1468,9 @@ iscsi_register_transport(struct iscsi_transport *tt) SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); + SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); + SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); + SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); BUG_ON(count > ISCSI_SESSION_ATTRS); @@ -1518,8 +1551,14 @@ static __init int iscsi_transport_init(void) goto unregister_session_class; } + iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); + if (!iscsi_eh_timer_workq) + goto release_nls; + return 0; +release_nls: + netlink_kernel_release(nls); unregister_session_class: transport_class_unregister(&iscsi_session_class); unregister_conn_class: @@ -1533,7 +1572,8 @@ unregister_transport_class: static void __exit iscsi_transport_exit(void) { - sock_release(nls->sk_socket); + destroy_workqueue(iscsi_eh_timer_workq); + netlink_kernel_release(nls); transport_class_unregister(&iscsi_connection_class); transport_class_unregister(&iscsi_session_class); transport_class_unregister(&iscsi_host_class); 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