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Implement querying of used space for APFS volumes on macOS #208

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Implement querying of used space for APFS volumes on macOS #208

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44 changes: 43 additions & 1 deletion mounts_darwin.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,31 @@
package main

import (
"syscall"
"unsafe"

"golang.org/x/sys/unix"
)

type attrlist struct {
bitmapcount uint16
reserved uint16
commonattr uint32
volattr uint32
dirattr uint32
fileattr uint32
forkattr uint32
}

type volAttrs struct {
length uint32
spaceUsed [8]byte
}

const ATTR_BIT_MAP_COUNT = 5
const ATTR_VOL_INFO = 0x80000000
const ATTR_VOL_SPACEUSED = 0x00800000

func (m *Mount) Stat() unix.Statfs_t {
return m.Metadata.(unix.Statfs_t)
}
Expand Down Expand Up @@ -71,6 +93,26 @@ func mounts() ([]Mount, []string, error) {
continue
}

used := (stat.Blocks - stat.Bfree) * uint64(stat.Bsize)

var mountPointPtr *byte
mountPointPtr, err = syscall.BytePtrFromString(mountPoint)
attrList := attrlist{
bitmapcount: ATTR_BIT_MAP_COUNT,
volattr: ATTR_VOL_INFO | ATTR_VOL_SPACEUSED,
}
var volAttrs volAttrs
volAttrsRes, _, _ := syscall.Syscall6(syscall.SYS_GETATTRLIST,
uintptr(unsafe.Pointer(mountPointPtr)),
uintptr(unsafe.Pointer(&attrList)),
uintptr(unsafe.Pointer(&volAttrs)),
unsafe.Sizeof(volAttrs),
unix.FSOPT_NOFOLLOW,
0)
if volAttrsRes == 0 {
used = *(*uint64)(unsafe.Pointer(&volAttrs.spaceUsed[0]))
}

d := Mount{
Device: device,
Mountpoint: mountPoint,
Expand All @@ -80,7 +122,7 @@ func mounts() ([]Mount, []string, error) {
Metadata: stat,
Total: stat.Blocks * uint64(stat.Bsize),
Free: stat.Bavail * uint64(stat.Bsize),
Used: (stat.Blocks - stat.Bfree) * uint64(stat.Bsize),
Used: used,
Inodes: stat.Files,
InodesFree: stat.Ffree,
InodesUsed: stat.Files - stat.Ffree,
Expand Down