btrfs-progs: mkfs: print zone count for each device

In zoned mode print zone count for each device, the zone size must be
the same so it's sufficient to print it in the summary.

  $ mkfs.btrfs -O zoned /dev/nullb[0-3]
  ...
  Zoned device:       yes
    Zone size:        16.00MiB
  ...
  Devices:
     ID        SIZE  ZONES  PATH
      1   512.00MiB     32  /dev/nullb0
      2   256.00MiB     16  /dev/nullb1
      3     1.00GiB     64  /dev/nullb2
      4     2.00GiB    128  /dev/nullb3

Issue: #693
Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

mkfs/main.c

@@ -57,6 +57,7 @@
 #include "common/box.h"
 #include "common/units.h"
 #include "common/string-utils.h"
+#include "common/string-table.h"
 #include "cmds/commands.h"
 #include "check/qgroup-verify.h"
 #include "mkfs/common.h"
@@ -486,11 +487,13 @@ static int _cmp_device_by_id(void *priv, struct list_head *a,
 	       list_entry(b, struct btrfs_device, dev_list)->devid;
 }
 
-static void list_all_devices(struct btrfs_root *root)
+static void list_all_devices(struct btrfs_root *root, bool is_zoned)
 {
 	struct btrfs_fs_devices *fs_devices;
 	struct btrfs_device *device;
 	int number_of_devices = 0;
+	struct string_table *tab;
+	int row, col;
 
 	fs_devices = root->fs_info->fs_devices;
 
@@ -501,15 +504,31 @@ static void list_all_devices(struct btrfs_root *root)
 
 	printf("Number of devices:  %d\n", number_of_devices);
 	printf("Devices:\n");
-	printf("   ID        SIZE  PATH\n");
+	if (is_zoned)
+		tab = table_create(4, number_of_devices + 1);
+	else
+		tab = table_create(3, number_of_devices + 1);
+	tab->spacing = STRING_TABLE_SPACING_2;
+	col = 0;
+	table_printf(tab, col++, 0, ">   ID");
+	table_printf(tab, col++, 0, ">      SIZE");
+	if (is_zoned)
+		table_printf(tab, col++, 0, ">ZONES");
+	table_printf(tab, col++, 0, "<PATH");
+
+	row = 1;
 	list_for_each_entry(device, &fs_devices->devices, dev_list) {
-		printf("  %3llu  %10s  %s\n",
-			device->devid,
-			pretty_size(device->total_bytes),
-			device->name);
-	}
-
+		col = 0;
+		table_printf(tab, col++, row, ">%llu", device->devid);
+		table_printf(tab, col++, row, ">%s", pretty_size(device->total_bytes));
+		if (is_zoned)
+			table_printf(tab, col++, row, ">%u", device->zone_info->nr_zones);
+		table_printf(tab, col++, row, "<%s", device->name);
+		row++;
+	}
+	table_dump(tab);
 	printf("\n");
+	table_free(tab);
 }
 
 static bool is_temp_block_group(struct extent_buffer *node,
@@ -2016,7 +2035,7 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
 		printf("Checksum:           %s\n",
 		       btrfs_super_csum_name(mkfs_cfg.csum_type));
 
-		list_all_devices(root);
+		list_all_devices(root, opt_zoned);
 
 		if (mkfs_cfg.csum_type == BTRFS_CSUM_TYPE_SHA256) {
 			printf(