It seems OpenBSD uses `f_frsize` instead of `f_bsize` to report correct
disksize.

I also sent a pull-request upstream but it seems to be inactive since some time.

Denis

Index: Makefile
===================================================================
RCS file: /cvs/ports/x11/i3status/Makefile,v
diff -u -p -r1.67 Makefile
--- Makefile	31 Mar 2025 14:37:47 -0000	1.67
+++ Makefile	30 Apr 2025 12:24:38 -0000
@@ -9,6 +9,8 @@ HOMEPAGE=		https://i3wm.org/i3status/
 
 MAINTAINER=		Robert Nagy <robert@openbsd.org>
 
+REVISION=		0
+
 # BSD
 PERMIT_PACKAGE =	Yes
 
Index: patches/patch-src_print_disk_info_c
===================================================================
RCS file: patches/patch-src_print_disk_info_c
diff -N patches/patch-src_print_disk_info_c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-src_print_disk_info_c	30 Apr 2025 12:24:38 -0000
@@ -0,0 +1,29 @@
+Index: src/print_disk_info.c
+--- src/print_disk_info.c.orig
++++ src/print_disk_info.c
+@@ -73,13 +73,13 @@ static bool below_threshold(struct statvfs buf, const 
+     } else if (strcasecmp(threshold_type, "percentage_avail") == 0) {
+         return 100.0 * (double)buf.f_bavail / (double)buf.f_blocks < low_threshold;
+     } else if (strcasecmp(threshold_type, "bytes_free") == 0) {
+-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
+-        return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold;
++#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__APPLE__)
++        return (double)buf.f_size * (double)buf.f_bfree < low_threshold;
+ #else
+         return (double)buf.f_frsize * (double)buf.f_bfree < low_threshold;
+ #endif
+     } else if (strcasecmp(threshold_type, "bytes_avail") == 0) {
+-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
++#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__APPLE__)
+         return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold;
+ #else
+         return (double)buf.f_frsize * (double)buf.f_bavail < low_threshold;
+@@ -198,7 +198,7 @@ void print_disk_info(disk_info_ctx_t *ctx) {
+     char string_percentage_used[STRING_SIZE];
+     char string_percentage_avail[STRING_SIZE];
+ 
+-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
++#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__APPLE__)
+     print_bytes_human(string_free, (uint64_t)buf.f_bsize * (uint64_t)buf.f_bfree, ctx->prefix_type);
+     print_bytes_human(string_used, (uint64_t)buf.f_bsize * ((uint64_t)buf.f_blocks - (uint64_t)buf.f_bfree), ctx->prefix_type);
+     print_bytes_human(string_total, (uint64_t)buf.f_bsize * (uint64_t)buf.f_blocks, ctx->prefix_type);