[SCSI] iscsi class: add session scanning
This just adds iscsi session scanning which works like fc rport scanning.
The future patches will hook the drivers into Mathew Wilcox's async
scanning infrastructure, so userspace does not have to special case
iscsi and so userspace does not have to make a extra special case for
hardware iscsi root scanning.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index f876b0a..af88955 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -128,11 +128,11 @@
INIT_LIST_HEAD(&ihost->sessions);
mutex_init(&ihost->mutex);
- snprintf(ihost->unbind_workq_name, KOBJ_NAME_LEN, "iscsi_unbind_%d",
+ snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
shost->host_no);
- ihost->unbind_workq = create_singlethread_workqueue(
- ihost->unbind_workq_name);
- if (!ihost->unbind_workq)
+ ihost->scan_workq = create_singlethread_workqueue(
+ ihost->scan_workq_name);
+ if (!ihost->scan_workq)
return -ENOMEM;
return 0;
}
@@ -143,7 +143,7 @@
struct Scsi_Host *shost = dev_to_shost(dev);
struct iscsi_host *ihost = shost->shost_data;
- destroy_workqueue(ihost->unbind_workq);
+ destroy_workqueue(ihost->scan_workq);
return 0;
}
@@ -302,6 +302,23 @@
return 0;
}
+static void iscsi_scan_session(struct work_struct *work)
+{
+ struct iscsi_cls_session *session =
+ container_of(work, struct iscsi_cls_session, scan_work);
+ unsigned long flags;
+
+ spin_lock_irqsave(&session->lock, flags);
+ if (session->state != ISCSI_SESSION_LOGGED_IN) {
+ spin_unlock_irqrestore(&session->lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(&session->lock, flags);
+
+ scsi_scan_target(&session->dev, 0, session->target_id,
+ SCAN_WILD_CARD, 1);
+}
+
static void session_recovery_timedout(struct work_struct *work)
{
struct iscsi_cls_session *session =
@@ -340,6 +357,8 @@
void iscsi_unblock_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;
spin_lock_irqsave(&session->lock, flags);
@@ -347,6 +366,7 @@
spin_unlock_irqrestore(&session->lock, flags);
__iscsi_unblock_session(session);
+ queue_work(ihost->scan_workq, &session->scan_work);
}
EXPORT_SYMBOL_GPL(iscsi_unblock_session);
@@ -390,7 +410,7 @@
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);
+ return queue_work(ihost->scan_workq, &session->unbind_work);
}
struct iscsi_cls_session *
@@ -411,6 +431,7 @@
INIT_LIST_HEAD(&session->host_list);
INIT_LIST_HEAD(&session->sess_list);
INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
+ INIT_WORK(&session->scan_work, iscsi_scan_session);
spin_lock_init(&session->lock);
/* this is released in the dev's release function */
@@ -530,13 +551,15 @@
spin_unlock_irqrestore(&session->lock, flags);
__iscsi_unblock_session(session);
iscsi_unbind_session(session);
+
+ /* flush running scans */
+ flush_workqueue(ihost->scan_workq);
/*
* 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);
/* hw iscsi may not have removed all connections from session */
err = device_for_each_child(&session->dev, NULL,
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 0e869d9..1f0ec46 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -177,11 +177,12 @@
struct list_head host_list;
struct iscsi_transport *transport;
spinlock_t lock;
+ struct work_struct scan_work;
+ struct work_struct unbind_work;
/* recovery fields */
int recovery_tmo;
struct delayed_work recovery_work;
- struct work_struct unbind_work;
int target_id;
@@ -203,8 +204,8 @@
struct iscsi_host {
struct list_head sessions;
struct mutex mutex;
- struct workqueue_struct *unbind_workq;
- char unbind_workq_name[KOBJ_NAME_LEN];
+ struct workqueue_struct *scan_workq;
+ char scan_workq_name[KOBJ_NAME_LEN];
};
/*