1 files changed, 138 insertions, 105 deletions

diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c
index 06336ecd872..c036595b17c 100644
--- a/drivers/target/target_core_tpg.c
+++ b/drivers/target/target_core_tpg.c
@@ -3,10 +3,7 @@
  *
  * This file contains generic Target Portal Group related functions.
  *
- * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
- * Copyright (c) 2005, 2006, 2007 SBE, Inc.
- * Copyright (c) 2007-2010 Rising Tide Systems
- * Copyright (c) 2008-2010 Linux-iSCSI.org
+ * (c) Copyright 2002-2013 Datera, Inc.
  *
  * Nicholas A. Bellinger <nab@kernel.org>
  *
@@ -60,11 +57,10 @@ static void core_clear_initiator_node_from_tpg(
 	int i;
 	struct se_dev_entry *deve;
 	struct se_lun *lun;
-	struct se_lun_acl *acl, *acl_tmp;
 
 	spin_lock_irq(&nacl->device_list_lock);
 	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
-		deve = &nacl->device_list[i];
+		deve = nacl->device_list[i];
 
 		if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 			continue;
@@ -78,31 +74,10 @@ static void core_clear_initiator_node_from_tpg(
 
 		lun = deve->se_lun;
 		spin_unlock_irq(&nacl->device_list_lock);
-		core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
-			TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
-
-		spin_lock(&lun->lun_acl_lock);
-		list_for_each_entry_safe(acl, acl_tmp,
-					&lun->lun_acl_list, lacl_list) {
-			if (!strcmp(acl->initiatorname, nacl->initiatorname) &&
-			    (acl->mapped_lun == deve->mapped_lun))
-				break;
-		}
-
-		if (!acl) {
-			pr_err("Unable to locate struct se_lun_acl for %s,"
-				" mapped_lun: %u\n", nacl->initiatorname,
-				deve->mapped_lun);
-			spin_unlock(&lun->lun_acl_lock);
-			spin_lock_irq(&nacl->device_list_lock);
-			continue;
-		}
-
-		list_del(&acl->lacl_list);
-		spin_unlock(&lun->lun_acl_lock);
+		core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
+			TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 
 		spin_lock_irq(&nacl->device_list_lock);
-		kfree(acl);
 	}
 	spin_unlock_irq(&nacl->device_list_lock);
 }
@@ -136,17 +111,12 @@ struct se_node_acl *core_tpg_get_initiator_node_acl(
 	struct se_node_acl *acl;
 
 	spin_lock_irq(&tpg->acl_node_lock);
-	list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
-		if (!strcmp(acl->initiatorname, initiatorname) &&
-		    !acl->dynamic_node_acl) {
-			spin_unlock_irq(&tpg->acl_node_lock);
-			return acl;
-		}
-	}
+	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 	spin_unlock_irq(&tpg->acl_node_lock);
 
-	return NULL;
+	return acl;
 }
+EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
 
 /*	core_tpg_add_node_to_devs():
  *
@@ -163,7 +133,7 @@ void core_tpg_add_node_to_devs(
 
 	spin_lock(&tpg->tpg_lun_lock);
 	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
-		lun = &tpg->tpg_lun_list[i];
+		lun = tpg->tpg_lun_list[i];
 		if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 			continue;
 
@@ -175,10 +145,7 @@ void core_tpg_add_node_to_devs(
 		 * demo_mode_write_protect is ON, or READ_ONLY;
 		 */
 		if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
-			if (dev->dev_flags & DF_READ_ONLY)
-				lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
-			else
-				lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
+			lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 		} else {
 			/*
 			 * Allow only optical drives to issue R/W in default RO
@@ -197,8 +164,8 @@ void core_tpg_add_node_to_devs(
 			(lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 			"READ-WRITE" : "READ-ONLY");
 
-		core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
-				lun_access, acl, tpg, 1);
+		core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
+				lun_access, acl, tpg);
 		spin_lock(&tpg->tpg_lun_lock);
 	}
 	spin_unlock(&tpg->tpg_lun_lock);
@@ -222,6 +189,34 @@ static int core_set_queue_depth_for_node(
 	return 0;
 }
 
+void array_free(void *array, int n)
+{
+	void **a = array;
+	int i;
+
+	for (i = 0; i < n; i++)
+		kfree(a[i]);
+	kfree(a);
+}
+
+static void *array_zalloc(int n, size_t size, gfp_t flags)
+{
+	void **a;
+	int i;
+
+	a = kzalloc(n * sizeof(void*), flags);
+	if (!a)
+		return NULL;
+	for (i = 0; i < n; i++) {
+		a[i] = kzalloc(size, flags);
+		if (!a[i]) {
+			array_free(a, n);
+			return NULL;
+		}
+	}
+	return a;
+}
+
 /*      core_create_device_list_for_node():
  *
  *
@@ -231,15 +226,15 @@ static int core_create_device_list_for_node(struct se_node_acl *nacl)
 	struct se_dev_entry *deve;
 	int i;
 
-	nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
-				TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
+	nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
+			sizeof(struct se_dev_entry), GFP_KERNEL);
 	if (!nacl->device_list) {
 		pr_err("Unable to allocate memory for"
 			" struct se_node_acl->device_list\n");
 		return -ENOMEM;
 	}
 	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
-		deve = &nacl->device_list[i];
+		deve = nacl->device_list[i];
 
 		atomic_set(&deve->ua_count, 0);
 		atomic_set(&deve->pr_ref_count, 0);
@@ -274,6 +269,8 @@ struct se_node_acl *core_tpg_check_initiator_node_acl(
 
 	INIT_LIST_HEAD(&acl->acl_list);
 	INIT_LIST_HEAD(&acl->acl_sess_list);
+	kref_init(&acl->acl_kref);
+	init_completion(&acl->acl_free_comp);
 	spin_lock_init(&acl->device_list_lock);
 	spin_lock_init(&acl->nacl_sess_lock);
 	atomic_set(&acl->acl_pr_ref_count, 0);
@@ -281,7 +278,6 @@ struct se_node_acl *core_tpg_check_initiator_node_acl(
 	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 	acl->se_tpg = tpg;
 	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
-	spin_lock_init(&acl->stats_lock);
 	acl->dynamic_node_acl = 1;
 
 	tpg->se_tpg_tfo->set_default_node_attributes(acl);
@@ -298,13 +294,11 @@ struct se_node_acl *core_tpg_check_initiator_node_acl(
 	}
 	/*
 	 * Here we only create demo-mode MappedLUNs from the active
-	 * TPG LUNs if the fabric is not explictly asking for
+	 * TPG LUNs if the fabric is not explicitly asking for
 	 * tpg_check_demo_mode_login_only() == 1.
 	 */
-	if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
-	    (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
-		do { ; } while (0);
-	else
+	if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
+	    (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 		core_tpg_add_node_to_devs(acl, tpg);
 
 	spin_lock_irq(&tpg->acl_node_lock);
@@ -329,19 +323,19 @@ void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 
 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 {
-	int i, ret;
+	int i;
 	struct se_lun *lun;
 
 	spin_lock(&tpg->tpg_lun_lock);
 	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
-		lun = &tpg->tpg_lun_list[i];
+		lun = tpg->tpg_lun_list[i];
 
 		if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 		    (lun->lun_se_dev == NULL))
 			continue;
 
 		spin_unlock(&tpg->tpg_lun_lock);
-		ret = core_dev_del_lun(tpg, lun->unpacked_lun);
+		core_dev_del_lun(tpg, lun->unpacked_lun);
 		spin_lock(&tpg->tpg_lun_lock);
 	}
 	spin_unlock(&tpg->tpg_lun_lock);
@@ -402,6 +396,8 @@ struct se_node_acl *core_tpg_add_initiator_node_acl(
 
 	INIT_LIST_HEAD(&acl->acl_list);
 	INIT_LIST_HEAD(&acl->acl_sess_list);
+	kref_init(&acl->acl_kref);
+	init_completion(&acl->acl_free_comp);
 	spin_lock_init(&acl->device_list_lock);
 	spin_lock_init(&acl->nacl_sess_lock);
 	atomic_set(&acl->acl_pr_ref_count, 0);
@@ -409,7 +405,6 @@ struct se_node_acl *core_tpg_add_initiator_node_acl(
 	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 	acl->se_tpg = tpg;
 	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
-	spin_lock_init(&acl->stats_lock);
 
 	tpg->se_tpg_tfo->set_default_node_attributes(acl);
 
@@ -448,39 +443,47 @@ int core_tpg_del_initiator_node_acl(
 	struct se_node_acl *acl,
 	int force)
 {
+	LIST_HEAD(sess_list);
 	struct se_session *sess, *sess_tmp;
-	int dynamic_acl = 0;
+	unsigned long flags;
+	int rc;
 
 	spin_lock_irq(&tpg->acl_node_lock);
 	if (acl->dynamic_node_acl) {
 		acl->dynamic_node_acl = 0;
-		dynamic_acl = 1;
 	}
 	list_del(&acl->acl_list);
 	tpg->num_node_acls--;
 	spin_unlock_irq(&tpg->acl_node_lock);
 
-	spin_lock_bh(&tpg->session_lock);
-	list_for_each_entry_safe(sess, sess_tmp,
-				&tpg->tpg_sess_list, sess_list) {
-		if (sess->se_node_acl != acl)
-			continue;
-		/*
-		 * Determine if the session needs to be closed by our context.
-		 */
-		if (!tpg->se_tpg_tfo->shutdown_session(sess))
+	spin_lock_irqsave(&acl->nacl_sess_lock, flags);
+	acl->acl_stop = 1;
+
+	list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
+				sess_acl_list) {
+		if (sess->sess_tearing_down != 0)
 			continue;
 
-		spin_unlock_bh(&tpg->session_lock);
-		/*
-		 * If the $FABRIC_MOD session for the Initiator Node ACL exists,
-		 * forcefully shutdown the $FABRIC_MOD session/nexus.
-		 */
-		tpg->se_tpg_tfo->close_session(sess);
+		target_get_session(sess);
+		list_move(&sess->sess_acl_list, &sess_list);
+	}
+	spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
+
+	list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
+		list_del(&sess->sess_acl_list);
 
-		spin_lock_bh(&tpg->session_lock);
+		rc = tpg->se_tpg_tfo->shutdown_session(sess);
+		target_put_session(sess);
+		if (!rc)
+			continue;
+		target_put_session(sess);
 	}
-	spin_unlock_bh(&tpg->session_lock);
+	target_put_nacl(acl);
+	/*
+	 * Wait for last target_put_nacl() to complete in target_complete_nacl()
+	 * for active fabric session transport_deregister_session() callbacks.
+	 */
+	wait_for_completion(&acl->acl_free_comp);
 
 	core_tpg_wait_for_nacl_pr_ref(acl);
 	core_clear_initiator_node_from_tpg(acl, tpg);
@@ -507,6 +510,7 @@ int core_tpg_set_initiator_node_queue_depth(
 {
 	struct se_session *sess, *init_sess = NULL;
 	struct se_node_acl *acl;
+	unsigned long flags;
 	int dynamic_acl = 0;
 
 	spin_lock_irq(&tpg->acl_node_lock);
@@ -525,7 +529,7 @@ int core_tpg_set_initiator_node_queue_depth(
 	}
 	spin_unlock_irq(&tpg->acl_node_lock);
 
-	spin_lock_bh(&tpg->session_lock);
+	spin_lock_irqsave(&tpg->session_lock, flags);
 	list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 		if (sess->se_node_acl != acl)
 			continue;
@@ -537,7 +541,7 @@ int core_tpg_set_initiator_node_queue_depth(
 				" depth and force session reinstatement"
 				" use the \"force=1\" parameter.\n",
 				tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
-			spin_unlock_bh(&tpg->session_lock);
+			spin_unlock_irqrestore(&tpg->session_lock, flags);
 
 			spin_lock_irq(&tpg->acl_node_lock);
 			if (dynamic_acl)
@@ -567,7 +571,7 @@ int core_tpg_set_initiator_node_queue_depth(
 	acl->queue_depth = queue_depth;
 
 	if (core_set_queue_depth_for_node(tpg, acl) < 0) {
-		spin_unlock_bh(&tpg->session_lock);
+		spin_unlock_irqrestore(&tpg->session_lock, flags);
 		/*
 		 * Force session reinstatement if
 		 * core_set_queue_depth_for_node() failed, because we assume
@@ -583,7 +587,7 @@ int core_tpg_set_initiator_node_queue_depth(
 		spin_unlock_irq(&tpg->acl_node_lock);
 		return -EINVAL;
 	}
-	spin_unlock_bh(&tpg->session_lock);
+	spin_unlock_irqrestore(&tpg->session_lock, flags);
 	/*
 	 * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 	 * forcefully shutdown the $FABRIC_MOD session/nexus.
@@ -605,6 +609,36 @@ int core_tpg_set_initiator_node_queue_depth(
 }
 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 
+/*	core_tpg_set_initiator_node_tag():
+ *
+ *	Initiator nodeacl tags are not used internally, but may be used by
+ *	userspace to emulate aliases or groups.
+ *	Returns length of newly-set tag or -EINVAL.
+ */
+int core_tpg_set_initiator_node_tag(
+	struct se_portal_group *tpg,
+	struct se_node_acl *acl,
+	const char *new_tag)
+{
+	if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
+		return -EINVAL;
+
+	if (!strncmp("NULL", new_tag, 4)) {
+		acl->acl_tag[0] = '\0';
+		return 0;
+	}
+
+	return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
+}
+EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
+
+static void core_tpg_lun_ref_release(struct percpu_ref *ref)
+{
+	struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
+
+	complete(&lun->lun_ref_comp);
+}
+
 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 {
 	/* Set in core_dev_setup_virtual_lun0() */
@@ -618,12 +652,11 @@ static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 	atomic_set(&lun->lun_acl_count, 0);
 	init_completion(&lun->lun_shutdown_comp);
 	INIT_LIST_HEAD(&lun->lun_acl_list);
-	INIT_LIST_HEAD(&lun->lun_cmd_list);
 	spin_lock_init(&lun->lun_acl_lock);
-	spin_lock_init(&lun->lun_cmd_lock);
 	spin_lock_init(&lun->lun_sep_lock);
+	init_completion(&lun->lun_ref_comp);
 
-	ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
+	ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
 	if (ret < 0)
 		return ret;
 
@@ -647,8 +680,8 @@ int core_tpg_register(
 	struct se_lun *lun;
 	u32 i;
 
-	se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
-				TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
+	se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
+			sizeof(struct se_lun), GFP_KERNEL);
 	if (!se_tpg->tpg_lun_list) {
 		pr_err("Unable to allocate struct se_portal_group->"
 				"tpg_lun_list\n");
@@ -656,16 +689,16 @@ int core_tpg_register(
 	}
 
 	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
-		lun = &se_tpg->tpg_lun_list[i];
+		lun = se_tpg->tpg_lun_list[i];
 		lun->unpacked_lun = i;
+		lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 		lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 		atomic_set(&lun->lun_acl_count, 0);
 		init_completion(&lun->lun_shutdown_comp);
 		INIT_LIST_HEAD(&lun->lun_acl_list);
-		INIT_LIST_HEAD(&lun->lun_cmd_list);
 		spin_lock_init(&lun->lun_acl_lock);
-		spin_lock_init(&lun->lun_cmd_lock);
 		spin_lock_init(&lun->lun_sep_lock);
+		init_completion(&lun->lun_ref_comp);
 	}
 
 	se_tpg->se_tpg_type = se_tpg_type;
@@ -682,7 +715,8 @@ int core_tpg_register(
 
 	if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 		if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
-			kfree(se_tpg);
+			array_free(se_tpg->tpg_lun_list,
+				   TRANSPORT_MAX_LUNS_PER_TPG);
 			return -ENOMEM;
 		}
 	}
@@ -742,12 +776,12 @@ int core_tpg_deregister(struct se_portal_group *se_tpg)
 		core_tpg_release_virtual_lun0(se_tpg);
 
 	se_tpg->se_tpg_fabric_ptr = NULL;
-	kfree(se_tpg->tpg_lun_list);
+	array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 	return 0;
 }
 EXPORT_SYMBOL(core_tpg_deregister);
 
-struct se_lun *core_tpg_pre_addlun(
+struct se_lun *core_tpg_alloc_lun(
 	struct se_portal_group *tpg,
 	u32 unpacked_lun)
 {
@@ -763,7 +797,7 @@ struct se_lun *core_tpg_pre_addlun(
 	}
 
 	spin_lock(&tpg->tpg_lun_lock);
-	lun = &tpg->tpg_lun_list[unpacked_lun];
+	lun = tpg->tpg_lun_list[unpacked_lun];
 	if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 		pr_err("TPG Logical Unit Number: %u is already active"
 			" on %s Target Portal Group: %u, ignoring request.\n",
@@ -777,18 +811,24 @@ struct se_lun *core_tpg_pre_addlun(
 	return lun;
 }
 
-int core_tpg_post_addlun(
+int core_tpg_add_lun(
 	struct se_portal_group *tpg,
 	struct se_lun *lun,
 	u32 lun_access,
-	void *lun_ptr)
+	struct se_device *dev)
 {
 	int ret;
 
-	ret = core_dev_export(lun_ptr, tpg, lun);
+	ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release);
 	if (ret < 0)
 		return ret;
 
+	ret = core_dev_export(dev, tpg, lun);
+	if (ret < 0) {
+		percpu_ref_cancel_init(&lun->lun_ref);
+		return ret;
+	}
+
 	spin_lock(&tpg->tpg_lun_lock);
 	lun->lun_access = lun_access;
 	lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
@@ -797,14 +837,6 @@ int core_tpg_post_addlun(
 	return 0;
 }
 
-static void core_tpg_shutdown_lun(
-	struct se_portal_group *tpg,
-	struct se_lun *lun)
-{
-	core_clear_lun_from_tpg(lun, tpg);
-	transport_clear_lun_from_sessions(lun);
-}
-
 struct se_lun *core_tpg_pre_dellun(
 	struct se_portal_group *tpg,
 	u32 unpacked_lun)
@@ -821,7 +853,7 @@ struct se_lun *core_tpg_pre_dellun(
 	}
 
 	spin_lock(&tpg->tpg_lun_lock);
-	lun = &tpg->tpg_lun_list[unpacked_lun];
+	lun = tpg->tpg_lun_list[unpacked_lun];
 	if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 		pr_err("%s Logical Unit Number: %u is not active on"
 			" Target Portal Group: %u, ignoring request.\n",
@@ -839,7 +871,8 @@ int core_tpg_post_dellun(
 	struct se_portal_group *tpg,
 	struct se_lun *lun)
 {
-	core_tpg_shutdown_lun(tpg, lun);
+	core_clear_lun_from_tpg(lun, tpg);
+	transport_clear_lun_ref(lun);
 
 	core_dev_unexport(lun->lun_se_dev, tpg, lun);