//go:build windows// +build windows // Copyright (c) 2015-2021 MinIO, Inc.//// This file is part of MinIO Object Storage stack//// This program is free software: you can redistribute it and/or modify// it under the terms of the GNU Affero General Public License as published by// the Free Software Foundation, either version 3 of the License, or// (at your option) any later version.//// This program is distributed in the hope that it will be useful// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the// GNU Affero General Public License for more details.//// You should have received a copy of the GNU Affero General Public License// along with this program.  If not, see <http://www.gnu.org/licenses/>. package disk import (	"fmt"	"os"	"syscall"	"unsafe" 	"golang.org/x/sys/windows") var (	kernel32 = windows.NewLazySystemDLL("kernel32.dll") 	// GetDiskFreeSpaceEx - https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspx	// Retrieves information about the amount of space that is available on a disk volume,	// which is the total amount of space, the total amount of free space, and the total	// amount of free space available to the user that is associated with the calling thread.	GetDiskFreeSpaceEx = kernel32.NewProc("GetDiskFreeSpaceExW") 	// GetDiskFreeSpace - https://msdn.microsoft.com/en-us/library/windows/desktop/aa364935(v=vs.85).aspx	// Retrieves information about the specified disk, including the amount of free space on the disk.	GetDiskFreeSpace = kernel32.NewProc("GetDiskFreeSpaceW")) // GetInfo returns total and free bytes available in a directory, e.g. `C:\`.// It returns free space available to the user (including quota limitations)//// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspxfunc GetInfo(path string) (info Info, err error) {	// Stat to know if the path exists.	if _, err = os.Stat(path); err != nil {		return Info{}, err	} 	lpFreeBytesAvailable := int64(0)	lpTotalNumberOfBytes := int64(0)	lpTotalNumberOfFreeBytes := int64(0) 	// Extract values safely	// BOOL WINAPI GetDiskFreeSpaceEx(	// _In_opt_  LPCTSTR         lpDirectoryName,	// _Out_opt_ PULARGE_INTEGER lpFreeBytesAvailable,	// _Out_opt_ PULARGE_INTEGER lpTotalNumberOfBytes,	// _Out_opt_ PULARGE_INTEGER lpTotalNumberOfFreeBytes	// );	_, _, _ = GetDiskFreeSpaceEx.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),		uintptr(unsafe.Pointer(&lpFreeBytesAvailable)),		uintptr(unsafe.Pointer(&lpTotalNumberOfBytes)),		uintptr(unsafe.Pointer(&lpTotalNumberOfFreeBytes))) 	if uint64(lpTotalNumberOfFreeBytes) > uint64(lpTotalNumberOfBytes) {		return info, fmt.Errorf("detected free space (%d) > total disk space (%d), fs corruption at (%s). please run 'fsck'",			uint64(lpTotalNumberOfFreeBytes), uint64(lpTotalNumberOfBytes), path)	} 	info = Info{		Total:  uint64(lpTotalNumberOfBytes),		Free:   uint64(lpTotalNumberOfFreeBytes),		Used:   uint64(lpTotalNumberOfBytes) - uint64(lpTotalNumberOfFreeBytes),		FSType: getFSType(path),	} 	// Return values of GetDiskFreeSpace()	lpSectorsPerCluster := uint32(0)	lpBytesPerSector := uint32(0)	lpNumberOfFreeClusters := uint32(0)	lpTotalNumberOfClusters := uint32(0) 	// Extract values safely	// BOOL WINAPI GetDiskFreeSpace(	//   _In_  LPCTSTR lpRootPathName,	//   _Out_ LPDWORD lpSectorsPerCluster,	//   _Out_ LPDWORD lpBytesPerSector,	//   _Out_ LPDWORD lpNumberOfFreeClusters,	//   _Out_ LPDWORD lpTotalNumberOfClusters	// );	_, _, _ = GetDiskFreeSpace.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),		uintptr(unsafe.Pointer(&lpSectorsPerCluster)),		uintptr(unsafe.Pointer(&lpBytesPerSector)),		uintptr(unsafe.Pointer(&lpNumberOfFreeClusters)),		uintptr(unsafe.Pointer(&lpTotalNumberOfClusters))) 	info.Files = uint64(lpTotalNumberOfClusters)	info.Ffree = uint64(lpNumberOfFreeClusters) 	return info, nil}