scsi: target: iscsi: Add upcast helpers

iSCSI target is cluttered with open-coded container_of() conversions from
se_nacl to iscsi_node_acl. The code could be cleaned by introducing a
helper - to_iscsi_nacl() (similar to other helpers in target core).

While at it, make another iSCSI conversion helper consistent and rename
iscsi_tpg() helper to to_iscsi_tpg().

Link: https://lore.kernel.org/r/20220523095905.26070-2-d.bogdanov@yadro.comReviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Reviewed-by: Konstantin Shelekhin <k.shelekhin@yadro.com>
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/target/iscsi/iscsi_target_configfs.c

@@ -210,7 +210,7 @@ static struct se_tpg_np *lio_target_call_addnptotpg(
 		return ERR_PTR(ret);
 	}
 
-	tpg = container_of(se_tpg, struct iscsi_portal_group, tpg_se_tpg);
+	tpg = to_iscsi_tpg(se_tpg);
 	ret = iscsit_get_tpg(tpg);
 	if (ret < 0)
 		return ERR_PTR(-EINVAL);
@@ -281,9 +281,7 @@ static ssize_t iscsi_nacl_attrib_##name##_show(struct config_item *item,\
 		char *page)						\
 {									\
 	struct se_node_acl *se_nacl = attrib_to_nacl(item);		\
-	struct iscsi_node_acl *nacl = container_of(se_nacl, struct iscsi_node_acl, \
-					se_node_acl);			\
-									\
+	struct iscsi_node_acl *nacl = to_iscsi_nacl(se_nacl);		\
 	return sprintf(page, "%u\n", nacl->node_attrib.name);		\
 }									\
 									\
@@ -291,8 +289,7 @@ static ssize_t iscsi_nacl_attrib_##name##_store(struct config_item *item,\
 		const char *page, size_t count)				\
 {									\
 	struct se_node_acl *se_nacl = attrib_to_nacl(item);		\
-	struct iscsi_node_acl *nacl = container_of(se_nacl, struct iscsi_node_acl, \
-					se_node_acl);			\
+	struct iscsi_node_acl *nacl = to_iscsi_nacl(se_nacl);		\
 	u32 val;							\
 	int ret;							\
 									\
@@ -377,15 +374,14 @@ static ssize_t iscsi_nacl_auth_##name##_show(struct config_item *item,	\
 		char *page)						\
 {									\
 	struct se_node_acl *nacl = auth_to_nacl(item);			\
-	return __iscsi_nacl_auth_##name##_show(container_of(nacl,	\
-			struct iscsi_node_acl, se_node_acl), page);	\
+	return __iscsi_nacl_auth_##name##_show(to_iscsi_nacl(nacl), page);	\
 }									\
 static ssize_t iscsi_nacl_auth_##name##_store(struct config_item *item,	\
 		const char *page, size_t count)				\
 {									\
 	struct se_node_acl *nacl = auth_to_nacl(item);			\
-	return __iscsi_nacl_auth_##name##_store(container_of(nacl,	\
-			struct iscsi_node_acl, se_node_acl), page, count); \
+	return __iscsi_nacl_auth_##name##_store(to_iscsi_nacl(nacl),	\
+						page, count); \
 }									\
 									\
 CONFIGFS_ATTR(iscsi_nacl_auth_, name)
@@ -417,8 +413,7 @@ static ssize_t iscsi_nacl_auth_##name##_show(struct config_item *item,	\
 		char *page)						\
 {									\
 	struct se_node_acl *nacl = auth_to_nacl(item);			\
-	return __iscsi_nacl_auth_##name##_show(container_of(nacl,	\
-			struct iscsi_node_acl, se_node_acl), page);	\
+	return __iscsi_nacl_auth_##name##_show(to_iscsi_nacl(nacl), page);	\
 }									\
 									\
 CONFIGFS_ATTR_RO(iscsi_nacl_auth_, name)
@@ -623,8 +618,7 @@ static ssize_t lio_target_nacl_cmdsn_depth_store(struct config_item *item,
 {
 	struct se_node_acl *se_nacl = acl_to_nacl(item);
 	struct se_portal_group *se_tpg = se_nacl->se_tpg;
-	struct iscsi_portal_group *tpg = container_of(se_tpg,
-			struct iscsi_portal_group, tpg_se_tpg);
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);
 	struct config_item *acl_ci, *tpg_ci, *wwn_ci;
 	u32 cmdsn_depth = 0;
 	int ret;
@@ -700,8 +694,7 @@ static struct configfs_attribute *lio_target_initiator_attrs[] = {
 static int lio_target_init_nodeacl(struct se_node_acl *se_nacl,
 		const char *name)
 {
-	struct iscsi_node_acl *acl =
-		container_of(se_nacl, struct iscsi_node_acl, se_node_acl);
+	struct iscsi_node_acl *acl = to_iscsi_nacl(se_nacl);
 
 	config_group_init_type_name(&acl->node_stat_grps.iscsi_sess_stats_group,
 			"iscsi_sess_stats", &iscsi_stat_sess_cit);
@@ -720,8 +713,7 @@ static ssize_t iscsi_tpg_attrib_##name##_show(struct config_item *item,	\
 		char *page)						\
 {									\
 	struct se_portal_group *se_tpg = attrib_to_tpg(item);		\
-	struct iscsi_portal_group *tpg = container_of(se_tpg,		\
-			struct iscsi_portal_group, tpg_se_tpg);	\
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);		\
 	ssize_t rb;							\
 									\
 	if (iscsit_get_tpg(tpg) < 0)					\
@@ -736,8 +728,7 @@ static ssize_t iscsi_tpg_attrib_##name##_store(struct config_item *item,\
 		const char *page, size_t count)				\
 {									\
 	struct se_portal_group *se_tpg = attrib_to_tpg(item);		\
-	struct iscsi_portal_group *tpg = container_of(se_tpg,		\
-			struct iscsi_portal_group, tpg_se_tpg);	\
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);		\
 	u32 val;							\
 	int ret;							\
 									\
@@ -800,8 +791,7 @@ static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = {
 static ssize_t __iscsi_##prefix##_##name##_show(struct se_portal_group *se_tpg,	\
 		char *page)							\
 {										\
-	struct iscsi_portal_group *tpg = container_of(se_tpg,			\
-				struct iscsi_portal_group, tpg_se_tpg);		\
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);			\
 	struct iscsi_node_auth *auth = &tpg->tpg_demo_auth;			\
 										\
 	if (!capable(CAP_SYS_ADMIN))						\
@@ -813,8 +803,7 @@ static ssize_t __iscsi_##prefix##_##name##_show(struct se_portal_group *se_tpg,
 static ssize_t __iscsi_##prefix##_##name##_store(struct se_portal_group *se_tpg,\
 		const char *page, size_t count)					\
 {										\
-	struct iscsi_portal_group *tpg = container_of(se_tpg,			\
-				struct iscsi_portal_group, tpg_se_tpg);		\
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);			\
 	struct iscsi_node_auth *auth = &tpg->tpg_demo_auth;			\
 										\
 	if (!capable(CAP_SYS_ADMIN))						\
@@ -861,8 +850,7 @@ DEF_TPG_AUTH_STR(password_mutual, NAF_PASSWORD_IN_SET);
 static ssize_t __iscsi_##prefix##_##name##_show(struct se_portal_group *se_tpg,	\
 		char *page)								\
 {										\
-	struct iscsi_portal_group *tpg = container_of(se_tpg,			\
-				struct iscsi_portal_group, tpg_se_tpg);		\
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);			\
 	struct iscsi_node_auth *auth = &tpg->tpg_demo_auth;			\
 										\
 	if (!capable(CAP_SYS_ADMIN))						\
@@ -900,8 +888,7 @@ static ssize_t iscsi_tpg_param_##name##_show(struct config_item *item,	\
 		char *page)						\
 {									\
 	struct se_portal_group *se_tpg = param_to_tpg(item);		\
-	struct iscsi_portal_group *tpg = container_of(se_tpg,		\
-			struct iscsi_portal_group, tpg_se_tpg);		\
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);		\
 	struct iscsi_param *param;					\
 	ssize_t rb;							\
 									\
@@ -923,8 +910,7 @@ static ssize_t iscsi_tpg_param_##name##_store(struct config_item *item, \
 		const char *page, size_t count)				\
 {									\
 	struct se_portal_group *se_tpg = param_to_tpg(item);		\
-	struct iscsi_portal_group *tpg = container_of(se_tpg,		\
-			struct iscsi_portal_group, tpg_se_tpg);		\
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);		\
 	char *buf;							\
 	int ret, len;							\
 									\
@@ -1073,8 +1059,7 @@ static struct se_portal_group *lio_target_tiqn_addtpg(struct se_wwn *wwn,
 static int lio_target_tiqn_enabletpg(struct se_portal_group *se_tpg,
 				     bool enable)
 {
-	struct iscsi_portal_group *tpg = container_of(se_tpg,
-			struct iscsi_portal_group, tpg_se_tpg);
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);
 	int ret;
 
 	ret = iscsit_get_tpg(tpg);
@@ -1106,7 +1091,7 @@ static void lio_target_tiqn_deltpg(struct se_portal_group *se_tpg)
 	struct iscsi_portal_group *tpg;
 	struct iscsi_tiqn *tiqn;
 
-	tpg = container_of(se_tpg, struct iscsi_portal_group, tpg_se_tpg);
+	tpg = to_iscsi_tpg(se_tpg);
 	tiqn = tpg->tpg_tiqn;
 	/*
 	 * iscsit_tpg_del_portal_group() assumes force=1
@@ -1416,46 +1401,41 @@ static void lio_aborted_task(struct se_cmd *se_cmd)
 	cmd->conn->conn_transport->iscsit_aborted_task(cmd->conn, cmd);
 }
 
-static inline struct iscsi_portal_group *iscsi_tpg(struct se_portal_group *se_tpg)
-{
-	return container_of(se_tpg, struct iscsi_portal_group, tpg_se_tpg);
-}
-
 static char *lio_tpg_get_endpoint_wwn(struct se_portal_group *se_tpg)
 {
-	return iscsi_tpg(se_tpg)->tpg_tiqn->tiqn;
+	return to_iscsi_tpg(se_tpg)->tpg_tiqn->tiqn;
 }
 
 static u16 lio_tpg_get_tag(struct se_portal_group *se_tpg)
 {
-	return iscsi_tpg(se_tpg)->tpgt;
+	return to_iscsi_tpg(se_tpg)->tpgt;
 }
 
 static u32 lio_tpg_get_default_depth(struct se_portal_group *se_tpg)
 {
-	return iscsi_tpg(se_tpg)->tpg_attrib.default_cmdsn_depth;
+	return to_iscsi_tpg(se_tpg)->tpg_attrib.default_cmdsn_depth;
 }
 
 static int lio_tpg_check_demo_mode(struct se_portal_group *se_tpg)
 {
-	return iscsi_tpg(se_tpg)->tpg_attrib.generate_node_acls;
+	return to_iscsi_tpg(se_tpg)->tpg_attrib.generate_node_acls;
 }
 
 static int lio_tpg_check_demo_mode_cache(struct se_portal_group *se_tpg)
 {
-	return iscsi_tpg(se_tpg)->tpg_attrib.cache_dynamic_acls;
+	return to_iscsi_tpg(se_tpg)->tpg_attrib.cache_dynamic_acls;
 }
 
 static int lio_tpg_check_demo_mode_write_protect(
 	struct se_portal_group *se_tpg)
 {
-	return iscsi_tpg(se_tpg)->tpg_attrib.demo_mode_write_protect;
+	return to_iscsi_tpg(se_tpg)->tpg_attrib.demo_mode_write_protect;
 }
 
 static int lio_tpg_check_prod_mode_write_protect(
 	struct se_portal_group *se_tpg)
 {
-	return iscsi_tpg(se_tpg)->tpg_attrib.prod_mode_write_protect;
+	return to_iscsi_tpg(se_tpg)->tpg_attrib.prod_mode_write_protect;
 }
 
 static int lio_tpg_check_prot_fabric_only(
@@ -1465,9 +1445,9 @@ static int lio_tpg_check_prot_fabric_only(
 	 * Only report fabric_prot_type if t10_pi has also been enabled
 	 * for incoming ib_isert sessions.
 	 */
-	if (!iscsi_tpg(se_tpg)->tpg_attrib.t10_pi)
+	if (!to_iscsi_tpg(se_tpg)->tpg_attrib.t10_pi)
 		return 0;
-	return iscsi_tpg(se_tpg)->tpg_attrib.fabric_prot_type;
+	return to_iscsi_tpg(se_tpg)->tpg_attrib.fabric_prot_type;
 }
 
 /*
@@ -1504,16 +1484,14 @@ static void lio_tpg_close_session(struct se_session *se_sess)
 
 static u32 lio_tpg_get_inst_index(struct se_portal_group *se_tpg)
 {
-	return iscsi_tpg(se_tpg)->tpg_tiqn->tiqn_index;
+	return to_iscsi_tpg(se_tpg)->tpg_tiqn->tiqn_index;
 }
 
 static void lio_set_default_node_attributes(struct se_node_acl *se_acl)
 {
-	struct iscsi_node_acl *acl = container_of(se_acl, struct iscsi_node_acl,
-				se_node_acl);
+	struct iscsi_node_acl *acl = to_iscsi_nacl(se_acl);
 	struct se_portal_group *se_tpg = se_acl->se_tpg;
-	struct iscsi_portal_group *tpg = container_of(se_tpg,
-				struct iscsi_portal_group, tpg_se_tpg);
+	struct iscsi_portal_group *tpg = to_iscsi_tpg(se_tpg);
 
 	acl->node_attrib.nacl = acl;
 	iscsit_set_default_node_attribues(acl, tpg);

drivers/target/iscsi/iscsi_target_nego.c

@@ -104,8 +104,8 @@ static u32 iscsi_handle_authentication(
 {
 	struct iscsit_session *sess = conn->sess;
 	struct iscsi_node_auth *auth;
-	struct iscsi_node_acl *iscsi_nacl;
-	struct iscsi_portal_group *iscsi_tpg;
+	struct iscsi_node_acl *nacl;
+	struct iscsi_portal_group *tpg;
 	struct se_node_acl *se_nacl;
 
 	if (!sess->sess_ops->SessionType) {
@@ -120,15 +120,13 @@ static u32 iscsi_handle_authentication(
 		}
 
 		if (se_nacl->dynamic_node_acl) {
-			iscsi_tpg = container_of(se_nacl->se_tpg,
-					struct iscsi_portal_group, tpg_se_tpg);
+			tpg = to_iscsi_tpg(se_nacl->se_tpg);
 
-			auth = &iscsi_tpg->tpg_demo_auth;
+			auth = &tpg->tpg_demo_auth;
 		} else {
-			iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
-						  se_node_acl);
+			nacl = to_iscsi_nacl(se_nacl);
 
-			auth = &iscsi_nacl->node_auth;
+			auth = &nacl->node_auth;
 		}
 	} else {
 		/*

drivers/target/iscsi/iscsi_target_tpg.c

@@ -394,8 +394,7 @@ struct iscsi_node_attrib *iscsit_tpg_get_node_attrib(
 {
 	struct se_session *se_sess = sess->se_sess;
 	struct se_node_acl *se_nacl = se_sess->se_node_acl;
-	struct iscsi_node_acl *acl = container_of(se_nacl, struct iscsi_node_acl,
-					se_node_acl);
+	struct iscsi_node_acl *acl = to_iscsi_nacl(se_nacl);
 
 	return &acl->node_attrib;
 }

include/target/iscsi/iscsi_target_core.h

@@ -758,6 +758,12 @@ struct iscsi_node_acl {
 	struct iscsi_node_stat_grps node_stat_grps;
 };
 
+static inline struct iscsi_node_acl *
+to_iscsi_nacl(struct se_node_acl *se_nacl)
+{
+	return container_of(se_nacl, struct iscsi_node_acl, se_node_acl);
+}
+
 struct iscsi_tpg_attrib {
 	u32			authentication;
 	u32			login_timeout;
@@ -839,6 +845,12 @@ struct iscsi_portal_group {
 	struct list_head	tpg_list;
 } ____cacheline_aligned;
 
+static inline struct iscsi_portal_group *
+to_iscsi_tpg(struct se_portal_group *se_tpg)
+{
+	return container_of(se_tpg, struct iscsi_portal_group, tpg_se_tpg);
+}
+
 struct iscsi_wwn_stat_grps {
 	struct config_group	iscsi_stat_group;
 	struct config_group	iscsi_instance_group;