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Fetch stats from folder mounted volumes #1534

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Fetch stats from folder mounted volumes #1534

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acd2212
Fetch stats from folder mounted volumes
dloucasfx Oct 3, 2023
a94b92c
fix PR review
dloucasfx Jan 8, 2024
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188 changes: 128 additions & 60 deletions disk/disk_windows.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,22 +4,30 @@
package disk

import (
"bytes"
"context"
"fmt"
"strings"
"syscall"
"unicode/utf16"
"unsafe"

"github.com/shirou/gopsutil/v3/internal/common"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/registry"
)

const volumeNameBufferLength = uint32(windows.MAX_PATH + 1)
const volumePathBufferLength = volumeNameBufferLength

var (
procGetDiskFreeSpaceExW = common.Modkernel32.NewProc("GetDiskFreeSpaceExW")
procGetLogicalDriveStringsW = common.Modkernel32.NewProc("GetLogicalDriveStringsW")
procGetDriveType = common.Modkernel32.NewProc("GetDriveTypeW")
procGetVolumeInformation = common.Modkernel32.NewProc("GetVolumeInformationW")
procGetDiskFreeSpaceExW = common.Modkernel32.NewProc("GetDiskFreeSpaceExW")
procGetLogicalDriveStringW = common.Modkernel32.NewProc("GetLogicalDriveStringsW")
procGetDriveTypeW = common.Modkernel32.NewProc("GetDriveTypeW")
procGetVolumeInformationW = common.Modkernel32.NewProc("GetVolumeInformationW")
procFindFirstVolumeW = common.Modkernel32.NewProc("FindFirstVolumeW")
procFindNextVolumeW = common.Modkernel32.NewProc("FindNextVolumeW")
procFindVolumeClose = common.Modkernel32.NewProc("FindVolumeClose")
procGetVolumePathNamesForVolumeNameW = common.Modkernel32.NewProc("GetVolumePathNamesForVolumeNameW")
)

var (
Expand Down Expand Up @@ -87,75 +95,100 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
Verbose: true,
}

var errLogicalDrives error
var errFirstVol error
retChan := make(chan PartitionStat)
quitChan := make(chan struct{})
defer close(quitChan)

getPartitions := func() {
defer close(retChan)

lpBuffer := make([]byte, 254)
volNameBuf := make([]uint16, volumeNameBufferLength)

diskret, _, err := procGetLogicalDriveStringsW.Call(
uintptr(len(lpBuffer)),
uintptr(unsafe.Pointer(&lpBuffer[0])))
if diskret == 0 {
errLogicalDrives = err
nextVolHandle, _, err := procFindFirstVolumeW.Call(
uintptr(unsafe.Pointer(&volNameBuf[0])),
uintptr(volumeNameBufferLength))
if windows.Handle(nextVolHandle) == windows.InvalidHandle {
errFirstVol = fmt.Errorf("failed to get first-volume: %w", err)
return
}
for _, v := range lpBuffer {
if v >= 65 && v <= 90 {
path := string(v) + ":"
typepath, _ := windows.UTF16PtrFromString(path)
typeret, _, _ := procGetDriveType.Call(uintptr(unsafe.Pointer(typepath)))
if typeret == 0 {
defer procFindVolumeClose.Call(nextVolHandle)
firstVolume := true
var volPaths []string

for {
if !firstVolume {
volNameBuf = make([]uint16, volumeNameBufferLength)
if volRet, _, err := procFindNextVolumeW.Call(
nextVolHandle,
uintptr(unsafe.Pointer(&volNameBuf[0])),
uintptr(volumeNameBufferLength)); err != nil && volRet == 0 {

if errno, ok := err.(syscall.Errno); ok && errno == windows.ERROR_NO_MORE_FILES {
break
}
warnings.Add(fmt.Errorf("failed to find next volume: %w", err))
continue
}
}

firstVolume = false
if volPaths, err = getVolumePaths(volNameBuf); err != nil {
warnings.Add(fmt.Errorf("failed to find paths for volume %s", windows.UTF16ToString(volNameBuf)))
continue
}

if len(volPaths) > 0 {
volPathPtr, _ := windows.UTF16PtrFromString(volPaths[0])
driveType, _, _ := procGetDriveTypeW.Call(uintptr(unsafe.Pointer(volPathPtr)))
if driveType == windows.DRIVE_UNKNOWN {
err := windows.GetLastError()
warnings.Add(err)
continue
}
// 2: DRIVE_REMOVABLE 3: DRIVE_FIXED 4: DRIVE_REMOTE 5: DRIVE_CDROM

if typeret == 2 || typeret == 3 || typeret == 4 || typeret == 5 {
lpVolumeNameBuffer := make([]byte, 256)
lpVolumeSerialNumber := int64(0)
lpMaximumComponentLength := int64(0)
lpFileSystemFlags := int64(0)
lpFileSystemNameBuffer := make([]byte, 256)
volpath, _ := windows.UTF16PtrFromString(string(v) + ":/")
driveret, _, err := procGetVolumeInformation.Call(
uintptr(unsafe.Pointer(volpath)),
uintptr(unsafe.Pointer(&lpVolumeNameBuffer[0])),
uintptr(len(lpVolumeNameBuffer)),
uintptr(unsafe.Pointer(&lpVolumeSerialNumber)),
uintptr(unsafe.Pointer(&lpMaximumComponentLength)),
uintptr(unsafe.Pointer(&lpFileSystemFlags)),
uintptr(unsafe.Pointer(&lpFileSystemNameBuffer[0])),
uintptr(len(lpFileSystemNameBuffer)))
if driveret == 0 {
if typeret == 5 || typeret == 2 {
continue // device is not ready will happen if there is no disk in the drive
for _, volPath := range volPaths {
if driveType == windows.DRIVE_REMOVABLE || driveType == windows.DRIVE_FIXED || driveType == windows.DRIVE_REMOTE || driveType == windows.DRIVE_CDROM {
fsFlags, fsNameBuf := uint32(0), make([]uint16, 256)
rootPathPtr, _ := windows.UTF16PtrFromString(volPath)
volNameBuf := make([]uint16, 256)
volSerialNum := uint32(0)
maxComponentLen := uint32(0)
driveRet, _, err := procGetVolumeInformationW.Call(
uintptr(unsafe.Pointer(rootPathPtr)),
uintptr(unsafe.Pointer(&volNameBuf[0])),
uintptr(len(volNameBuf)),
uintptr(unsafe.Pointer(&volSerialNum)),
uintptr(unsafe.Pointer(&maxComponentLen)),
uintptr(unsafe.Pointer(&fsFlags)),
uintptr(unsafe.Pointer(&fsNameBuf[0])),
uintptr(len(fsNameBuf)))
if err != nil && driveRet == 0 {
if driveType == windows.DRIVE_CDROM || driveType == windows.DRIVE_REMOVABLE {
continue
}
warnings.Add(fmt.Errorf("failed to get volume information: %w", err))
continue
}
opts := []string{"rw"}
if int64(fsFlags)&fileReadOnlyVolume != 0 {
opts = []string{"ro"}
}
if int64(fsFlags)&fileFileCompression != 0 {
opts = append(opts, "compress")
}
warnings.Add(err)
continue
}
opts := []string{"rw"}
if lpFileSystemFlags&fileReadOnlyVolume != 0 {
opts = []string{"ro"}
}
if lpFileSystemFlags&fileFileCompression != 0 {
opts = append(opts, "compress")
}

select {
case retChan <- PartitionStat{
Mountpoint: path,
Device: path,
Fstype: string(bytes.ReplaceAll(lpFileSystemNameBuffer, []byte("\x00"), []byte(""))),
Opts: opts,
}:
case <-quitChan:
return
path := strings.TrimRight(volPath, "\\")

select {
case retChan <- PartitionStat{
Mountpoint: path,
Device: path,
Fstype: windows.UTF16PtrToString(&fsNameBuf[0]),
Opts: opts,
}:
case <-quitChan:
return
}
}
}
}
Expand All @@ -169,8 +202,8 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
select {
case p, ok := <-retChan:
if !ok {
if errLogicalDrives != nil {
return ret, errLogicalDrives
if errFirstVol != nil {
return ret, errFirstVol
}
return ret, warnings.Reference()
}
Expand All @@ -181,6 +214,41 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
}
}

// getVolumePaths returns the path for the given volume name.
func getVolumePaths(volNameBuf []uint16) ([]string, error) {
volPathsBuf := make([]uint16, volumePathBufferLength)
returnLen := uint32(0)
if result, _, err := procGetVolumePathNamesForVolumeNameW.Call(
uintptr(unsafe.Pointer(&volNameBuf[0])),
uintptr(unsafe.Pointer(&volPathsBuf[0])),
uintptr(volumePathBufferLength),
uintptr(unsafe.Pointer(&returnLen))); err != nil && result == 0 {
return nil, err
}
return split0(volPathsBuf, int(returnLen)), nil
}

// split0 iterates through s16 upto `end` and slices `s16` into sub-slices separated by the null character (uint16(0)).
// split0 converts the sub-slices between the null characters into strings then returns them in a slice.
func split0(s16 []uint16, end int) []string {
if end > len(s16) {
end = len(s16)
}

from, ss := 0, make([]string, 0)

for to := 0; to < end; to++ {
if s16[to] == 0 {
if from < to && s16[from] != 0 {
ss = append(ss, string(utf16.Decode(s16[from:to])))
}
from = to + 1
}
}

return ss
}

func IOCountersWithContext(ctx context.Context, names ...string) (map[string]IOCountersStat, error) {
// https://github.com/giampaolo/psutil/blob/544e9daa4f66a9f80d7bf6c7886d693ee42f0a13/psutil/arch/windows/disk.c#L83
drivemap := make(map[string]IOCountersStat, 0)
Expand Down
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