Merge pull request #1341 from ekozlov-search/windows_disk_stat

Discs statistics on Windows platform.

weed/stats/disk_notsupported.go

@@ -1,4 +1,4 @@
-// +build windows openbsd netbsd plan9 solaris
+// +build openbsd netbsd plan9 solaris
 
 package stats
 

weed/stats/disk_windows.go

@@ -0,0 +1,46 @@
+package stats
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"golang.org/x/sys/windows"
+	"syscall"
+	"unsafe"
+)
+var (
+	kernel32           = windows.NewLazySystemDLL("Kernel32.dll")
+	getDiskFreeSpaceEx = kernel32.NewProc("GetDiskFreeSpaceExW")
+)
+
+func fillInDiskStatus(disk *volume_server_pb.DiskStatus) {
+
+	ptr, err := syscall.UTF16PtrFromString(disk.Dir)
+
+	if err != nil {
+		return
+	}
+	var _temp uint64
+	/* #nosec */
+	r, _, e := syscall.Syscall6(
+		getDiskFreeSpaceEx.Addr(),
+		4,
+		uintptr(unsafe.Pointer(ptr)),
+		uintptr(unsafe.Pointer(&disk.Free)),
+		uintptr(unsafe.Pointer(&disk.All)),
+		uintptr(unsafe.Pointer(&_temp)),
+		0,
+		0,
+	)
+
+	if r == 0 {
+		if e != 0 {
+			return
+		}
+
+		return
+	}
+	disk.Used = disk.All - disk.Free
+	disk.PercentFree = float32((float64(disk.Free) / float64(disk.All)) * 100)
+	disk.PercentUsed = float32((float64(disk.Used) / float64(disk.All)) * 100)
+
+	return
+}