From 2d6af8eb16894b44ccbfe42d948265bbb0d7a6ab Mon Sep 17 00:00:00 2001
From: Bartosz Kuzma <bartosz.kuzma@gmail.com>
Date: Sat, 20 Sep 2025 05:58:37 +0200
Subject: [PATCH 1/2] Add support for NetBSD

---
 filesystems_netbsd.go |  37 +++++++++++++++
 mounts_netbsd.go      | 105 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 filesystems_netbsd.go
 create mode 100644 mounts_netbsd.go

diff --git a/filesystems_netbsd.go b/filesystems_netbsd.go
new file mode 100644
index 00000000..ce322e5f
--- /dev/null
+++ b/filesystems_netbsd.go
@@ -0,0 +1,37 @@
+//go:build netbsd
+// +build netbsd
+
+package main
+
+func isFuseFs(m Mount) bool {
+	//FIXME: implement
+	return false
+}
+
+func isNetworkFs(m Mount) bool {
+	fs := []string{"nfs", "smbfs"}
+
+	for _, v := range fs {
+		if m.Fstype == v {
+			return true
+		}
+	}
+
+	return false
+}
+
+func isSpecialFs(m Mount) bool {
+	fs := []string{"devfs", "kernfs", "procfs", "ptyfs", "tmpfs"}
+
+	for _, v := range fs {
+		if m.Fstype == v {
+			return true
+		}
+	}
+
+	return false
+}
+
+func isHiddenFs(m Mount) bool {
+	return false
+}
diff --git a/mounts_netbsd.go b/mounts_netbsd.go
new file mode 100644
index 00000000..ca53e634
--- /dev/null
+++ b/mounts_netbsd.go
@@ -0,0 +1,105 @@
+//go:build netbsd
+// +build netbsd
+
+package main
+
+import (
+	"unsafe"
+	"golang.org/x/sys/unix"
+)
+
+func (m *Mount) Stat() unix.Statfs_t {
+	return m.Metadata.(unix.Statfs_t)
+}
+
+// Use unix.Getvfsstat when CL 550476 is merged
+// https://go-review.googlesource.com/c/sys/+/550476
+func Getvfsstat(buf []unix.Statvfs_t, flags int) (n int, err error) {
+	var (
+		_p0     unsafe.Pointer
+		bufsize uintptr
+	)
+	if len(buf) > 0 {
+		_p0 = unsafe.Pointer(&buf[0])
+		bufsize = unsafe.Sizeof(unix.Statvfs_t{}) * uintptr(len(buf))
+	}
+	r0, _, e1 := unix.Syscall(unix.SYS_GETVFSSTAT, uintptr(_p0), bufsize, uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
+func mounts() ([]Mount, []string, error) {
+	var ret []Mount
+	var warnings []string
+
+	count, err := Getvfsstat(nil, unix.ST_WAIT)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	fs := make([]unix.Statvfs_t, count)
+	if _, err := Getvfsstat(fs, unix.ST_WAIT); err != nil {
+		return nil, nil, err
+	}
+
+	for _, stat := range fs {
+		opts := "rw"
+		if stat.Flag&unix.MNT_RDONLY != 0 {
+			opts = "ro"
+		}
+		if stat.Flag&unix.MNT_SYNCHRONOUS != 0 {
+			opts += ",sync"
+		}
+		if stat.Flag&unix.MNT_NOEXEC != 0 {
+			opts += ",noexec"
+		}
+		if stat.Flag&unix.MNT_NOSUID != 0 {
+			opts += ",nosuid"
+		}
+		if stat.Flag&unix.MNT_NODEV != 0 {
+			opts += ",nodev"
+		}
+		if stat.Flag&unix.MNT_ASYNC != 0 {
+			opts += ",async"
+		}
+		if stat.Flag&unix.MNT_SOFTDEP != 0 {
+			opts += ",softdep"
+		}
+		if stat.Flag&unix.MNT_NOATIME != 0 {
+			opts += ",noatime"
+		}
+
+		device := byteToString(stat.Mntfromname[:])
+		mountPoint := byteToString(stat.Mntonname[:])
+		fsType := byteToString(stat.Fstypename[:])
+
+		if len(device) == 0 {
+			continue
+		}
+
+		d := Mount{
+			Device:     device,
+			Mountpoint: mountPoint,
+			Fstype:     fsType,
+			Type:       fsType,
+			Opts:       opts,
+			Metadata:   stat,
+			Total:      (uint64(stat.Blocks) * uint64(stat.Bsize)),
+			Free:       (uint64(stat.Bavail) * uint64(stat.Bsize)),
+			Used:       (uint64(stat.Blocks) - uint64(stat.Bfree)) * uint64(stat.Bsize),
+			Inodes:     stat.Files,
+			InodesFree: uint64(stat.Ffree),
+			InodesUsed: stat.Files - uint64(stat.Ffree),
+			Blocks:     uint64(stat.Blocks),
+			BlockSize:  uint64(stat.Bsize),
+		}
+		d.DeviceType = deviceType(d)
+
+		ret = append(ret, d)
+	}
+
+	return ret, warnings, nil
+}

From 47405c4c52d23672e2a0cf356cdea3d6a15630fc Mon Sep 17 00:00:00 2001
From: Bartosz Kuzma <bartosz.kuzma@gmail.com>
Date: Tue, 23 Dec 2025 05:11:48 +0100
Subject: [PATCH 2/2] Fix incorrect sizes reported by duf.

According to sys/statvfs.h blocks, bfree, bavail are in units of frsize not bsize.
---
 mounts_netbsd.go | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/mounts_netbsd.go b/mounts_netbsd.go
index ca53e634..6f55c76b 100644
--- a/mounts_netbsd.go
+++ b/mounts_netbsd.go
@@ -68,6 +68,9 @@ func mounts() ([]Mount, []string, error) {
 		if stat.Flag&unix.MNT_SOFTDEP != 0 {
 			opts += ",softdep"
 		}
+		if stat.Flag&unix.MNT_LOG != 0 {
+			opts += ",log"
+		}
 		if stat.Flag&unix.MNT_NOATIME != 0 {
 			opts += ",noatime"
 		}
@@ -87,14 +90,14 @@ func mounts() ([]Mount, []string, error) {
 			Type:       fsType,
 			Opts:       opts,
 			Metadata:   stat,
-			Total:      (uint64(stat.Blocks) * uint64(stat.Bsize)),
-			Free:       (uint64(stat.Bavail) * uint64(stat.Bsize)),
-			Used:       (uint64(stat.Blocks) - uint64(stat.Bfree)) * uint64(stat.Bsize),
+			Total:      (uint64(stat.Blocks) * uint64(stat.Frsize)),
+			Free:       (uint64(stat.Bavail) * uint64(stat.Frsize)),
+			Used:       (uint64(stat.Blocks) - uint64(stat.Bfree)) * uint64(stat.Frsize),
 			Inodes:     stat.Files,
 			InodesFree: uint64(stat.Ffree),
 			InodesUsed: stat.Files - uint64(stat.Ffree),
 			Blocks:     uint64(stat.Blocks),
-			BlockSize:  uint64(stat.Bsize),
+			BlockSize:  uint64(stat.Frsize),
 		}
 		d.DeviceType = deviceType(d)