mirror of https://gitee.com/openkylin/linux.git
[SCSI] iscsi class: Add logging to scsi_transport_iscsi.c
Logging for connections and sessions in the scsi_transport_iscsi module is now controlled by module parameters. Signed-off-by: Erez Zilber <erezzi.list@gmail.com> [Mike Christie: newline fixups and modification of some dbg statements] Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Mike Christie
James Bottomley
parent
b06fc73a9e
commit
632248aab3
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@ -36,6 +36,38 @@
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#define ISCSI_TRANSPORT_VERSION "2.0-870"
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static int dbg_session;
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module_param_named(debug_session, dbg_session, int,
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S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_session,
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"Turn on debugging for sessions in scsi_transport_iscsi "
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"module. Set to 1 to turn on, and zero to turn off. Default "
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"is off.");
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static int dbg_conn;
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module_param_named(debug_conn, dbg_conn, int,
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S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug_conn,
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"Turn on debugging for connections in scsi_transport_iscsi "
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"module. Set to 1 to turn on, and zero to turn off. Default "
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"is off.");
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#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
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do { \
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if (dbg_session) \
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iscsi_cls_session_printk(KERN_INFO, _session, \
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"%s: " dbg_fmt, \
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__func__, ##arg); \
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} while (0);
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#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
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do { \
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if (dbg_conn) \
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iscsi_cls_conn_printk(KERN_INFO, _conn, \
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"%s: " dbg_fmt, \
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__func__, ##arg); \
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} while (0);
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struct iscsi_internal {
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struct scsi_transport_template t;
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struct iscsi_transport *iscsi_transport;
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@ -377,6 +409,7 @@ static void iscsi_session_release(struct device *dev)
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shost = iscsi_session_to_shost(session);
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scsi_host_put(shost);
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ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
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kfree(session);
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}
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@ -441,6 +474,9 @@ static int iscsi_user_scan_session(struct device *dev, void *data)
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return 0;
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session = iscsi_dev_to_session(dev);
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ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
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shost = iscsi_session_to_shost(session);
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ihost = shost->shost_data;
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@ -448,8 +484,7 @@ static int iscsi_user_scan_session(struct device *dev, void *data)
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spin_lock_irqsave(&session->lock, flags);
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if (session->state != ISCSI_SESSION_LOGGED_IN) {
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spin_unlock_irqrestore(&session->lock, flags);
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mutex_unlock(&ihost->mutex);
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return 0;
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goto user_scan_exit;
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}
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id = session->target_id;
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spin_unlock_irqrestore(&session->lock, flags);
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@ -462,7 +497,10 @@ static int iscsi_user_scan_session(struct device *dev, void *data)
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scsi_scan_target(&session->dev, 0, id,
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scan_data->lun, 1);
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}
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user_scan_exit:
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mutex_unlock(&ihost->mutex);
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ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
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return 0;
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}
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@ -522,7 +560,9 @@ static void session_recovery_timedout(struct work_struct *work)
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if (session->transport->session_recovery_timedout)
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session->transport->session_recovery_timedout(session);
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ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
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scsi_target_unblock(&session->dev);
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ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
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}
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static void __iscsi_unblock_session(struct work_struct *work)
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@ -534,6 +574,7 @@ static void __iscsi_unblock_session(struct work_struct *work)
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struct iscsi_cls_host *ihost = shost->shost_data;
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unsigned long flags;
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ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
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/*
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* The recovery and unblock work get run from the same workqueue,
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* so try to cancel it if it was going to run after this unblock.
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@ -553,6 +594,7 @@ static void __iscsi_unblock_session(struct work_struct *work)
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if (scsi_queue_work(shost, &session->scan_work))
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atomic_inc(&ihost->nr_scans);
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}
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ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
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}
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/**
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@ -579,10 +621,12 @@ static void __iscsi_block_session(struct work_struct *work)
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block_work);
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unsigned long flags;
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ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
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spin_lock_irqsave(&session->lock, flags);
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session->state = ISCSI_SESSION_FAILED;
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spin_unlock_irqrestore(&session->lock, flags);
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scsi_target_block(&session->dev);
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ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
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queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
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session->recovery_tmo * HZ);
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}
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@ -602,6 +646,8 @@ static void __iscsi_unbind_session(struct work_struct *work)
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struct iscsi_cls_host *ihost = shost->shost_data;
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unsigned long flags;
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ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
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/* Prevent new scans and make sure scanning is not in progress */
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mutex_lock(&ihost->mutex);
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spin_lock_irqsave(&session->lock, flags);
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@ -616,6 +662,7 @@ static void __iscsi_unbind_session(struct work_struct *work)
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scsi_remove_target(&session->dev);
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iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
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ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
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}
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struct iscsi_cls_session *
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@ -647,6 +694,8 @@ iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
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device_initialize(&session->dev);
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if (dd_size)
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session->dd_data = &session[1];
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ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
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return session;
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}
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EXPORT_SYMBOL_GPL(iscsi_alloc_session);
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@ -712,6 +761,7 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
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spin_unlock_irqrestore(&sesslock, flags);
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iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
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ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
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return 0;
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release_host:
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@ -752,6 +802,7 @@ static void iscsi_conn_release(struct device *dev)
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struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
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struct device *parent = conn->dev.parent;
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ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
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kfree(conn);
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put_device(parent);
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}
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@ -774,6 +825,8 @@ void iscsi_remove_session(struct iscsi_cls_session *session)
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unsigned long flags;
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int err;
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ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
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spin_lock_irqsave(&sesslock, flags);
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list_del(&session->sess_list);
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spin_unlock_irqrestore(&sesslock, flags);
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@ -807,12 +860,15 @@ void iscsi_remove_session(struct iscsi_cls_session *session)
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"for session. Error %d.\n", err);
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transport_unregister_device(&session->dev);
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ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
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device_del(&session->dev);
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}
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EXPORT_SYMBOL_GPL(iscsi_remove_session);
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void iscsi_free_session(struct iscsi_cls_session *session)
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{
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ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
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iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
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put_device(&session->dev);
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}
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@ -828,6 +884,7 @@ EXPORT_SYMBOL_GPL(iscsi_free_session);
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int iscsi_destroy_session(struct iscsi_cls_session *session)
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{
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iscsi_remove_session(session);
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ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
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iscsi_free_session(session);
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return 0;
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}
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@ -885,6 +942,8 @@ iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
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list_add(&conn->conn_list, &connlist);
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conn->active = 1;
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spin_unlock_irqrestore(&connlock, flags);
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ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
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return conn;
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release_parent_ref:
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@ -912,6 +971,7 @@ int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
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spin_unlock_irqrestore(&connlock, flags);
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transport_unregister_device(&conn->dev);
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ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
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device_unregister(&conn->dev);
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return 0;
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}
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@ -1200,6 +1260,9 @@ int iscsi_session_event(struct iscsi_cls_session *session,
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"Cannot notify userspace of session "
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"event %u. Check iscsi daemon\n",
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event);
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ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
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event, rc);
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return rc;
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}
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EXPORT_SYMBOL_GPL(iscsi_session_event);
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@ -1221,6 +1284,8 @@ iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
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shost = iscsi_session_to_shost(session);
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ev->r.c_session_ret.host_no = shost->host_no;
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ev->r.c_session_ret.sid = session->sid;
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ISCSI_DBG_TRANS_SESSION(session,
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"Completed creating transport session\n");
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return 0;
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}
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@ -1246,6 +1311,8 @@ iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
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ev->r.c_conn_ret.sid = session->sid;
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ev->r.c_conn_ret.cid = conn->cid;
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ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
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return 0;
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}
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@ -1258,8 +1325,10 @@ iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev
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if (!conn)
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return -EINVAL;
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ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
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if (transport->destroy_conn)
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transport->destroy_conn(conn);
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return 0;
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}
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