btrfs-progs: filesystem show: introduce printing helper functions

Introduce helper functions for printing the filesystem data and list of
devices. This prepares the both printing code paths of filesystem show
to support json output.

Signed-off-by: Jelle van der Waa <jvanderwaa@redhat.com>

Author: jelly

cmds/filesystem.c

@@ -273,6 +273,34 @@ static void splice_device_list(struct list_head *seed_devices,
 	list_splice(seed_devices, all_devices);
 }
 
+static void print_filesystem_info(char *label, char uuidbuf[BTRFS_UUID_UNPARSED_SIZE],
+				u64 bytes_used, u64 num_devices,
+				unsigned unit_mode)
+{
+	if (label)
+		pr_verbose(LOG_DEFAULT, "Label: '%s' ", label);
+	else
+		pr_verbose(LOG_DEFAULT, "Label: none ");
+
+	pr_verbose(LOG_DEFAULT, " uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
+		num_devices,
+		pretty_size_mode(bytes_used,
+				 unit_mode));
+}
+
+static void print_filesystem_device(u64 devid, u64 total_bytes, u64 bytes_used,
+				char *path,
+				bool missing,
+				unsigned unit_mode)
+{
+	pr_verbose(LOG_DEFAULT, "\tdevid %4llu size %s used %s path %s%s\n",
+		devid,
+		pretty_size_mode(total_bytes, unit_mode),
+		pretty_size_mode(bytes_used, unit_mode),
+		path,
+		missing ? " MISSING" : "");
+}
+
 static void print_devices(struct btrfs_fs_devices *fs_devices,
 			  u64 *devs_found, unsigned unit_mode)
 {
@@ -290,12 +318,11 @@ static void print_devices(struct btrfs_fs_devices *fs_devices,
 
 	list_sort(NULL, all_devices, cmp_device_id);
 	list_for_each_entry(device, all_devices, dev_list) {
-		pr_verbose(LOG_DEFAULT, "\tdevid %4llu size %s used %s path %s\n",
-		       device->devid,
-		       pretty_size_mode(device->total_bytes, unit_mode),
-		       pretty_size_mode(device->bytes_used, unit_mode),
-		       device->name);
-
+		print_filesystem_device(device->devid,
+					device->total_bytes, device->bytes_used,
+					device->name,
+					false,
+					unit_mode);
 		(*devs_found)++;
 	}
 }
@@ -314,14 +341,11 @@ static void print_one_uuid(struct btrfs_fs_devices *fs_devices,
 	uuid_unparse(fs_devices->fsid, uuidbuf);
 	device = list_entry(fs_devices->devices.next, struct btrfs_device,
 			    dev_list);
-	if (device->label && device->label[0])
-		pr_verbose(LOG_DEFAULT, "Label: '%s' ", device->label);
-	else
-		pr_verbose(LOG_DEFAULT, "Label: none ");
-
 	total = device->total_devs;
-	pr_verbose(LOG_DEFAULT, " uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
-	       total, pretty_size_mode(device->super_bytes_used, unit_mode));
+
+	print_filesystem_info(device->label && device->label[0] ? device->label : NULL, uuidbuf,
+			      device->super_bytes_used, total,
+			      unit_mode);
 
 	print_devices(fs_devices, &devs_found, unit_mode);
 
@@ -360,15 +384,9 @@ static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 		return ret;
 
 	uuid_unparse(fs_info->fsid, uuidbuf);
-	if (label && *label)
-		pr_verbose(LOG_DEFAULT, "Label: '%s' ", label);
-	else
-		pr_verbose(LOG_DEFAULT, "Label: none ");
-
-	pr_verbose(LOG_DEFAULT, " uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
-			fs_info->num_devices,
-			pretty_size_mode(calc_used_bytes(space_info),
-					 unit_mode));
+	print_filesystem_info(label && *label ? label : NULL, uuidbuf,
+				calc_used_bytes(space_info), fs_info->num_devices,
+				unit_mode);
 
 	for (i = 0; i < fs_info->num_devices; i++) {
 		char *canonical_path;
@@ -378,18 +396,20 @@ static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 		/* Add check for missing devices even mounted */
 		fd = open((char *)tmp_dev_info->path, O_RDONLY);
 		if (fd < 0) {
-			pr_verbose(LOG_DEFAULT, "\tdevid %4llu size 0 used 0 path %s MISSING\n",
-					tmp_dev_info->devid, tmp_dev_info->path);
+			print_filesystem_device(tmp_dev_info->devid,
+						0, 0,
+						(char *)tmp_dev_info->path,
+						true,
+						unit_mode);
 			continue;
-
 		}
 		close(fd);
 		canonical_path = path_canonicalize((char *)tmp_dev_info->path);
-		pr_verbose(LOG_DEFAULT, "\tdevid %4llu size %s used %s path %s\n",
-			tmp_dev_info->devid,
-			pretty_size_mode(tmp_dev_info->total_bytes, unit_mode),
-			pretty_size_mode(tmp_dev_info->bytes_used, unit_mode),
-			canonical_path);
+		print_filesystem_device(tmp_dev_info->devid,
+					tmp_dev_info->total_bytes, tmp_dev_info->bytes_used,
+					canonical_path,
+					false,
+					unit_mode);
 
 		free(canonical_path);
 	}