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inaccurate disk size on windows #325

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inaccurate disk size on windows #325

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23 changes: 23 additions & 0 deletions pkg/block/block_windows.go
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Expand Up @@ -6,7 +6,10 @@
package block

import (
"os"
"strings"
"syscall"
"unsafe"

"github.com/StackExchange/wmi"

Expand Down Expand Up @@ -158,6 +161,26 @@ func getDiskDrives() ([]win32DiskDrive, error) {
if err := wmi.Query(wqlDiskDrive, &win3232DiskDriveDescriptions); err != nil {
return nil, err
}
for _, disk := range win3232DiskDriveDescriptions {
if disk.DeviceID == nil {
continue
}
volume, err := os.OpenFile(*disk.DeviceID, os.O_RDWR, 0)
if err != nil {
continue
}
// Get the volume's underlying partition size in NTFS clusters.
var (
partitionSize int64
bytes uint32
)
const _IOCTL_DISK_GET_LENGTH_INFO = 0x0007405C
err = syscall.DeviceIoControl(syscall.Handle(volume.Fd()), _IOCTL_DISK_GET_LENGTH_INFO, nil, 0, (*byte)(unsafe.Pointer(&partitionSize)), 8, &bytes, nil)
volume.Close()
if err == nil {
*disk.Size = uint64(partitionSize)
}
}
return win3232DiskDriveDescriptions, nil
}

Expand Down