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[SCSI] iscsi class: add async scan helper

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In qla4xxx's probe it will call the iscsi session setup functions
for session that got setup on the initial start. This then makes
it easy for the iscsi class to export a helper which indicates
when those scans are done.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Mike Christie 2008-01-31 13:36:48 -06:00 committed by James Bottomley
parent 568d303b5b
commit 8aae18adb2
2 changed files with 37 additions and 4 deletions
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38
drivers/scsi/scsi_transport_iscsi.c
View File

@ -127,6 +127,7 @@ 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);
atomic_set(&ihost->nr_scans, 0);
snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
shost->host_no);
@ -284,6 +285,25 @@ static int iscsi_is_session_dev(const struct device *dev)
return dev->release == iscsi_session_release;
}
/**
* iscsi_scan_finished - helper to report when running scans are done
* @shost: scsi host
* @time: scan run time
*
* This function can be used by drives like qla4xxx to report to the scsi
* layer when the scans it kicked off at module load time are done.
*/
int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
struct iscsi_host *ihost = shost->shost_data;
/*
* qla4xxx will have kicked off some session unblocks before calling
* scsi_scan_host, so just wait for them to complete.
*/
return !atomic_read(&ihost->nr_scans);
}
EXPORT_SYMBOL_GPL(iscsi_scan_finished);
static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
uint id, uint lun)
{
@ -306,17 +326,21 @@ static void iscsi_scan_session(struct work_struct *work)
{
struct iscsi_cls_session *session =
container_of(work, struct iscsi_cls_session, scan_work);
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);
if (session->state != ISCSI_SESSION_LOGGED_IN) {
spin_unlock_irqrestore(&session->lock, flags);
return;
goto done;
}
spin_unlock_irqrestore(&session->lock, flags);
scsi_scan_target(&session->dev, 0, session->target_id,
SCAN_WILD_CARD, 1);
done:
atomic_dec(&ihost->nr_scans);
}
static void session_recovery_timedout(struct work_struct *work)
@ -366,7 +390,15 @@ void iscsi_unblock_session(struct iscsi_cls_session *session)
spin_unlock_irqrestore(&session->lock, flags);
__iscsi_unblock_session(session);
queue_work(ihost->scan_workq, &session->scan_work);
/*
* Only do kernel scanning if the driver is properly hooked into
* the async scanning code (drivers like iscsi_tcp do login and
* scanning from userspace).
*/
if (shost->hostt->scan_finished) {
if (queue_work(ihost->scan_workq, &session->scan_work))
atomic_inc(&ihost->nr_scans);
}
}
EXPORT_SYMBOL_GPL(iscsi_unblock_session);
@ -550,7 +582,7 @@ void iscsi_remove_session(struct iscsi_cls_session *session)
session->state = ISCSI_SESSION_FREE;
spin_unlock_irqrestore(&session->lock, flags);
__iscsi_unblock_session(session);
iscsi_unbind_session(session);
__iscsi_unbind_session(&session->unbind_work);
/* flush running scans */
flush_workqueue(ihost->scan_workq);

3
include/scsi/scsi_transport_iscsi.h
View File

@ -203,6 +203,7 @@ struct iscsi_cls_session {
struct iscsi_host {
struct list_head sessions;
atomic_t nr_scans;
struct mutex mutex;
struct workqueue_struct *scan_workq;
char scan_workq_name[KOBJ_NAME_LEN];
@ -229,6 +230,6 @@ extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
extern void iscsi_unblock_session(struct iscsi_cls_session *session);
extern void iscsi_block_session(struct iscsi_cls_session *session);
extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
#endif