netapp: print output for single device too

In addition to printing info of all ontap devices on the host,
provide an option to print the output for the specified
device alone.

Signed-off-by: Martin George <marting@netapp.com>

Author: martin-gpy

plugins/netapp/netapp-nvme.c

@@ -317,7 +317,7 @@ static void netapp_smdevices_print(struct smdevice_info *devices, int count, int
 }
 
 static void netapp_ontapdevices_print_regular(struct ontapdevice_info *devices,
-		int count, int format)
+		int count, int format, const char *devname)
 {
 	char vsname[ONTAP_LABEL_LEN] = " ";
 	char nspath[ONTAP_NS_PATHLEN] = " ";
@@ -346,6 +346,21 @@ static void netapp_ontapdevices_print_regular(struct ontapdevice_info *devices,
 	}
 
 	for (i = 0; i < count; i++) {
+		if (devname && !strcmp(devname, basename(devices[i].dev))) {
+			/* found the device, fetch and print for that alone */
+			netapp_get_ns_size(size, &lba, &devices[i].ns);
+			nvme_uuid_to_string(devices[i].uuid, uuid_str);
+			netapp_get_ontap_labels(vsname, nspath,
+					devices[i].log_data);
+
+			printf(formatstr, devices[i].dev, vsname, nspath,
+					devices[i].nsid, uuid_str, size);
+			return;
+		}
+	}
+
+	for (i = 0; i < count; i++) {
+		/* fetch info and print for all devices */
 		netapp_get_ns_size(size, &lba, &devices[i].ns);
 		nvme_uuid_to_string(devices[i].uuid, uuid_str);
 		netapp_get_ontap_labels(vsname, nspath, devices[i].log_data);
@@ -356,7 +371,7 @@ static void netapp_ontapdevices_print_regular(struct ontapdevice_info *devices,
 }
 
 static void netapp_ontapdevices_print_json(struct ontapdevice_info *devices,
-		int count)
+		int count, const char *devname)
 {
 	struct json_object *root = NULL;
 	struct json_object *json_devices = NULL;
@@ -372,6 +387,22 @@ static void netapp_ontapdevices_print_json(struct ontapdevice_info *devices,
 	json_devices = json_create_array();
 
 	for (i = 0; i < count; i++) {
+		if (devname && !strcmp(devname, basename(devices[i].dev))) {
+			/* found the device, fetch info for that alone */
+			netapp_get_ns_size(size, &lba, &devices[i].ns);
+			nvme_uuid_to_string(devices[i].uuid, uuid_str);
+			netapp_get_ontap_labels(vsname, nspath, devices[i].log_data);
+
+			netapp_ontapdevice_json(json_devices, devices[i].dev,
+					vsname, nspath, devices[i].nsid,
+					uuid_str, size, lba,
+					le64_to_cpu(devices[i].ns.nsze));
+			goto out;
+		}
+	}
+
+	for (i = 0; i < count; i++) {
+		/* fetch info for all devices */
 		netapp_get_ns_size(size, &lba, &devices[i].ns);
 		nvme_uuid_to_string(devices[i].uuid, uuid_str);
 		netapp_get_ontap_labels(vsname, nspath, devices[i].log_data);
@@ -382,6 +413,7 @@ static void netapp_ontapdevices_print_json(struct ontapdevice_info *devices,
 				le64_to_cpu(devices[i].ns.nsze));
 	}
 
+out:
 	/* complete the json output */
 	json_object_add_value_array(root, "ONTAPdevices", json_devices);
 	json_print_object(root, NULL);
@@ -626,6 +658,7 @@ static int netapp_ontapdevices(int argc, char **argv, struct command *command,
 	int num, i, fd, ret, fmt;
 	struct ontapdevice_info *ontapdevices;
 	char path[264];
+	char *devname = NULL;
 	int num_ontapdevices = 0;
 
 	struct config {
@@ -651,6 +684,18 @@ static int netapp_ontapdevices(int argc, char **argv, struct command *command,
 		return -EINVAL;
 	}
 
+	if (optind < argc)
+		devname = basename(argv[optind++]);
+
+	if (devname) {
+		int subsys_num, nsid;
+
+		if (sscanf(devname, "nvme%dn%d", &subsys_num, &nsid) != 2) {
+			fprintf(stderr, "Invalid device name %s\n", devname);
+			return -EINVAL;
+		}
+	}
+
 	num = scandir(dev_path, &devices, netapp_nvme_filter, alphasort);
 	if (num <= 0) {
 		fprintf(stderr, "No NVMe devices detected.\n");
@@ -682,10 +727,10 @@ static int netapp_ontapdevices(int argc, char **argv, struct command *command,
 	if (num_ontapdevices) {
 		if (fmt == NNORMAL || fmt == NCOLUMN)
 			netapp_ontapdevices_print_regular(ontapdevices,
-					num_ontapdevices, fmt);
+					num_ontapdevices, fmt, devname);
 		else if (fmt == NJSON)
 			netapp_ontapdevices_print_json(ontapdevices,
-					num_ontapdevices);
+					num_ontapdevices, devname);
 	}
 
 	for (i = 0; i < num; i++)