From b19930753a5dfcc4f4860864216b7acde61f1818 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Sun, 2 May 2010 08:15:29 +0000
Subject: [PATCH] Added sysfs support.

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1674 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 srpt/src/ib_srpt.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++
 srpt/src/ib_srpt.h |  2 ++
 2 files changed, 60 insertions(+)

diff --git a/srpt/src/ib_srpt.c b/srpt/src/ib_srpt.c
index 1e303224b..ee3370702 100644
--- a/srpt/src/ib_srpt.c
+++ b/srpt/src/ib_srpt.c
@@ -1894,6 +1894,47 @@ static void srpt_release_channel(struct scst_session *scst_sess)
 	TRACE_EXIT();
 }
 
+#if !defined(CONFIG_SCST_PROC)
+/**
+ * srpt_enable_target() - Allows to enable a target via sysfs.
+ */
+static int srpt_enable_target(struct scst_tgt *scst_tgt, bool enable)
+{
+	struct srpt_device *sdev = scst_tgt_get_tgt_priv(scst_tgt);
+
+	TRACE_DBG("%s target %s", enable ? "Enabling" : "Disabling",
+		  sdev->device->name);
+
+	spin_lock_irq(&sdev->spinlock);
+	sdev->enabled = enable;
+	spin_unlock_irq(&sdev->spinlock);
+
+	return 0;
+}
+
+/**
+ * srpt_is_target_enabled() - Allows to query a targets status via sysfs.
+ */
+static bool srpt_is_target_enabled(struct scst_tgt *scst_tgt)
+{
+	struct srpt_device *sdev = scst_tgt_get_tgt_priv(scst_tgt);
+
+	bool res;
+	spin_lock_irq(&sdev->spinlock);
+	res = sdev->enabled;
+	spin_unlock_irq(&sdev->spinlock);
+	return res;
+}
+#else
+/**
+ * srpt_is_target_enabled() - Reports that a target is enabled when using procfs.
+ */
+static bool srpt_is_target_enabled(struct scst_tgt *scst_tgt)
+{
+	return true;
+}
+#endif
+
 /**
  * srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
  *
@@ -1959,6 +2000,15 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
 		goto reject;
 	}
 
+	if (!srpt_is_target_enabled(sdev->scst_tgt)) {
+		rej->reason =
+		    cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
+		ret = -EINVAL;
+		PRINT_ERROR("rejected SRP_LOGIN_REQ because the target %s"
+			    " has not yet been enabled", sdev->device->name);
+		goto reject;
+	}
+
 	if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
 		rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
 
@@ -2964,6 +3014,14 @@ static struct scst_tgt_template srpt_template = {
 	.name = DRV_NAME,
 	.sg_tablesize = SRPT_DEF_SG_TABLESIZE,
 	.max_hw_pending_time = 60/*seconds*/,
+#if !defined(CONFIG_SCST_PROC)
+	.enable_target = srpt_enable_target,
+	.is_target_enabled = srpt_is_target_enabled,
+#endif
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+	.default_trace_flags = DEFAULT_SRPT_TRACE_FLAGS,
+	.trace_flags = &trace_flag,
+#endif
 	.detect = srpt_detect,
 	.release = srpt_release,
 	.xmit_response = srpt_xmit_response,
diff --git a/srpt/src/ib_srpt.h b/srpt/src/ib_srpt.h
index fdb053099..07213f673 100644
--- a/srpt/src/ib_srpt.h
+++ b/srpt/src/ib_srpt.h
@@ -283,6 +283,7 @@ struct srpt_port {
  * @event_handler: per-HCA asynchronous IB event handler.
  * @dev:           per-port srpt-<portname> device instance.
  * @scst_tgt:      SCST target information associated with this HCA.
+ * @enabled:       Whether or not this device is considered enabled by SCST.
  */
 struct srpt_device {
 	struct ib_device *device;
@@ -302,6 +303,7 @@ struct srpt_device {
 	struct device dev;
 #endif
 	struct scst_tgt *scst_tgt;
+	bool enabled;
 };
 
 #endif				/* IB_SRPT_H */