nvme: add delete ns error message output

Print it if delete NS failed and NS management not supported.

Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>

Author: ikegami-t

nvme.c

@@ -2783,6 +2783,32 @@ static int id_endurance_grp_list(int argc, char **argv, struct command *cmd,
 	return err;
 }
 
+static void delete_ns_show_error(struct nvme_dev *dev, int err)
+{
+	_cleanup_free_ struct nvme_id_ctrl *ctrl = NULL;
+
+	if (err < 0) {
+		nvme_show_error("delete namespace: %s", nvme_strerror(errno));
+		return;
+	}
+
+	nvme_show_init();
+
+	nvme_show_status(err);
+
+	ctrl = nvme_alloc(sizeof(*ctrl));
+	if (!ctrl)
+		return;
+
+	err = nvme_cli_identify_ctrl(dev, ctrl);
+	if (!err) {
+		if (!(le16_to_cpu(ctrl->oacs) & NVME_CTRL_OACS_NS_MGMT))
+			nvme_show_result("NS management and attachment not supported");
+	}
+
+	nvme_show_finish();
+}
+
 static int delete_ns(int argc, char **argv, struct command *cmd, struct plugin *plugin)
 {
 	const char *desc = "Delete the given namespace by "
@@ -2824,10 +2850,8 @@ static int delete_ns(int argc, char **argv, struct command *cmd, struct plugin *
 	err = nvme_cli_ns_mgmt_delete(dev, cfg.namespace_id, nvme_cfg.timeout);
 	if (!err)
 		printf("%s: Success, deleted nsid:%d\n", cmd->name, cfg.namespace_id);
-	else if (err > 0)
-		nvme_show_status(err);
 	else
-		nvme_show_error("delete namespace: %s", nvme_strerror(errno));
+		delete_ns_show_error(dev, err);
 
 	return err;
 }