scsi: target: replace fabric_ops.name with fabric_alias

iscsi_target_mod is the only LIO fabric where fabric_ops.name differs from
the fabric_ops.fabric_name string.  fabric_ops.name is used when matching
target/$fabric ConfigFS create paths, so rename it .fabric_alias and
fallback to target/$fabric vs .fabric_name comparison if .fabric_alias
isn't initialised.  iscsi_target_mod is the only fabric module to set
.fabric_alias . All other fabric modules rely on .fabric_name matching and
can drop the duplicate string.
Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -3673,7 +3673,6 @@ static struct configfs_attribute *srpt_wwn_attrs[] = {
 
 static const struct target_core_fabric_ops srpt_template = {
 	.module				= THIS_MODULE,
-	.name				= "srpt",
 	.fabric_name			= "srpt",
 	.tpg_get_wwn			= srpt_get_fabric_wwn,
 	.tpg_get_tag			= srpt_get_tag,

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

@@ -4039,7 +4039,6 @@ static struct configfs_attribute *ibmvscsis_tpg_attrs[] = {
 
 static const struct target_core_fabric_ops ibmvscsis_ops = {
 	.module				= THIS_MODULE,
-	.name				= "ibmvscsis",
 	.fabric_name			= "ibmvscsis",
 	.max_data_sg_nents		= MAX_TXU / PAGE_SIZE,
 	.tpg_get_wwn			= ibmvscsis_get_fabric_wwn,

drivers/scsi/qla2xxx/tcm_qla2xxx.c

@@ -1910,7 +1910,6 @@ static struct configfs_attribute *tcm_qla2xxx_wwn_attrs[] = {
 
 static const struct target_core_fabric_ops tcm_qla2xxx_ops = {
 	.module				= THIS_MODULE,
-	.name				= "qla2xxx",
 	.fabric_name			= "qla2xxx",
 	.node_acl_size			= sizeof(struct tcm_qla2xxx_nacl),
 	/*
@@ -1959,7 +1958,6 @@ static const struct target_core_fabric_ops tcm_qla2xxx_ops = {
 
 static const struct target_core_fabric_ops tcm_qla2xxx_npiv_ops = {
 	.module				= THIS_MODULE,
-	.name				= "qla2xxx_npiv",
 	.fabric_name			= "qla2xxx_npiv",
 	.node_acl_size			= sizeof(struct tcm_qla2xxx_nacl),
 	.tpg_get_wwn			= tcm_qla2xxx_get_fabric_wwn,

drivers/target/iscsi/iscsi_target_configfs.c

@@ -1544,7 +1544,7 @@ static void lio_release_cmd(struct se_cmd *se_cmd)
 
 const struct target_core_fabric_ops iscsi_ops = {
 	.module				= THIS_MODULE,
-	.name				= "iscsi",
+	.fabric_alias			= "iscsi",
 	.fabric_name			= "iSCSI",
 	.node_acl_size			= sizeof(struct iscsi_node_acl),
 	.tpg_get_wwn			= lio_tpg_get_endpoint_wwn,

drivers/target/loopback/tcm_loop.c

@@ -1144,7 +1144,6 @@ static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
 
 static const struct target_core_fabric_ops loop_ops = {
 	.module				= THIS_MODULE,
-	.name				= "loopback",
 	.fabric_name			= "loopback",
 	.tpg_get_wwn			= tcm_loop_get_endpoint_wwn,
 	.tpg_get_tag			= tcm_loop_get_tag,

drivers/target/sbp/sbp_target.c

@@ -2318,7 +2318,6 @@ static struct configfs_attribute *sbp_tpg_attrib_attrs[] = {
 
 static const struct target_core_fabric_ops sbp_ops = {
 	.module				= THIS_MODULE,
-	.name				= "sbp",
 	.fabric_name			= "sbp",
 	.tpg_get_wwn			= sbp_get_fabric_wwn,
 	.tpg_get_tag			= sbp_get_tag,

drivers/target/target_core_configfs.c

@@ -172,7 +172,10 @@ static struct target_fabric_configfs *target_core_get_fabric(
 
 	mutex_lock(&g_tf_lock);
 	list_for_each_entry(tf, &g_tf_list, tf_list) {
-		if (!strcmp(tf->tf_ops->name, name)) {
+		const char *cmp_name = tf->tf_ops->fabric_alias;
+		if (!cmp_name)
+			cmp_name = tf->tf_ops->fabric_name;
+		if (!strcmp(cmp_name, name)) {
 			atomic_inc(&tf->tf_access_cnt);
 			mutex_unlock(&g_tf_lock);
 			return tf;
@@ -249,7 +252,7 @@ static struct config_group *target_core_register_fabric(
 		return ERR_PTR(-EINVAL);
 	}
 	pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
-			" %s\n", tf->tf_ops->name);
+			" %s\n", tf->tf_ops->fabric_name);
 	/*
 	 * On a successful target_core_get_fabric() look, the returned
 	 * struct target_fabric_configfs *tf will contain a usage reference.
@@ -282,7 +285,7 @@ static void target_core_deregister_fabric(
 		" tf list\n", config_item_name(item));
 
 	pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
-			" %s\n", tf->tf_ops->name);
+			" %s\n", tf->tf_ops->fabric_name);
 	atomic_dec(&tf->tf_access_cnt);
 
 	pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
@@ -342,19 +345,22 @@ EXPORT_SYMBOL(target_undepend_item);
 
 static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
 {
-	if (!tfo->name) {
-		pr_err("Missing tfo->name\n");
-		return -EINVAL;
-	}
-	if (strlen(tfo->name) >= TARGET_FABRIC_NAME_SIZE) {
-		pr_err("Passed name: %s exceeds TARGET_FABRIC"
-			"_NAME_SIZE\n", tfo->name);
-		return -EINVAL;
+	if (tfo->fabric_alias) {
+		if (strlen(tfo->fabric_alias) >= TARGET_FABRIC_NAME_SIZE) {
+			pr_err("Passed alias: %s exceeds "
+				"TARGET_FABRIC_NAME_SIZE\n", tfo->fabric_alias);
+			return -EINVAL;
+		}
 	}
 	if (!tfo->fabric_name) {
 		pr_err("Missing tfo->fabric_name\n");
 		return -EINVAL;
 	}
+	if (strlen(tfo->fabric_name) >= TARGET_FABRIC_NAME_SIZE) {
+		pr_err("Passed name: %s exceeds "
+			"TARGET_FABRIC_NAME_SIZE\n", tfo->fabric_name);
+		return -EINVAL;
+	}
 	if (!tfo->tpg_get_wwn) {
 		pr_err("Missing tfo->tpg_get_wwn()\n");
 		return -EINVAL;
@@ -486,7 +492,7 @@ void target_unregister_template(const struct target_core_fabric_ops *fo)
 
 	mutex_lock(&g_tf_lock);
 	list_for_each_entry(t, &g_tf_list, tf_list) {
-		if (!strcmp(t->tf_ops->name, fo->name)) {
+		if (!strcmp(t->tf_ops->fabric_name, fo->fabric_name)) {
 			BUG_ON(atomic_read(&t->tf_access_cnt));
 			list_del(&t->tf_list);
 			mutex_unlock(&g_tf_lock);

drivers/target/tcm_fc/tfc_conf.c

@@ -422,7 +422,6 @@ static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
 
 static const struct target_core_fabric_ops ft_fabric_ops = {
 	.module =			THIS_MODULE,
-	.name =				"fc",
 	.fabric_name =			"fc",
 	.node_acl_size =		sizeof(struct ft_node_acl),
 	.tpg_get_wwn =			ft_get_fabric_wwn,

drivers/usb/gadget/function/f_tcm.c

@@ -1713,7 +1713,6 @@ static int usbg_check_stop_free(struct se_cmd *se_cmd)
 
 static const struct target_core_fabric_ops usbg_ops = {
 	.module				= THIS_MODULE,
-	.name				= "usb_gadget",
 	.fabric_name			= "usb_gadget",
 	.tpg_get_wwn			= usbg_get_fabric_wwn,
 	.tpg_get_tag			= usbg_get_tag,

drivers/vhost/scsi.c

@@ -2284,7 +2284,6 @@ static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
 
 static const struct target_core_fabric_ops vhost_scsi_ops = {
 	.module				= THIS_MODULE,
-	.name				= "vhost",
 	.fabric_name			= "vhost",
 	.tpg_get_wwn			= vhost_scsi_get_fabric_wwn,
 	.tpg_get_tag			= vhost_scsi_get_tpgt,

drivers/xen/xen-scsiback.c

@@ -1805,7 +1805,6 @@ static int scsiback_check_false(struct se_portal_group *se_tpg)
 
 static const struct target_core_fabric_ops scsiback_ops = {
 	.module				= THIS_MODULE,
-	.name				= "xen-pvscsi",
 	.fabric_name			= "xen-pvscsi",
 	.tpg_get_wwn			= scsiback_get_fabric_wwn,
 	.tpg_get_tag			= scsiback_get_tag,

include/target/target_core_fabric.h

@@ -8,10 +8,16 @@
 
 struct target_core_fabric_ops {
 	struct module *module;
-	const char *name;
 	/*
-	 * fabric_name is used for the ALUA state path and is stored on disk
-	 * with PR state.
+	 * XXX: Special case for iscsi/iSCSI...
+	 * If non-null, fabric_alias is used for matching target/$fabric
+	 * ConfigFS paths. If null, fabric_name is used for this (see below).
+	 */
+	const char *fabric_alias;
+	/*
+	 * fabric_name is used for matching target/$fabric ConfigFS paths
+	 * without a fabric_alias (see above). It's also used for the ALUA state
+	 * path and is stored on disk with PR state.
 	 */
 	const char *fabric_name;
 	size_t node_acl_size;