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Windows: Block ReFS file systems

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Signed-off-by: John Howard <jhoward@microsoft.com>
This commit is contained in:
John Howard 2016-08-08 14:25:33 -07:00
parent b435d75526
commit 1cb9e9b44e
1 changed files with 41 additions and 0 deletions
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41
daemon/graphdriver/windows/windows.go
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@ -6,6 +6,7 @@ import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
@ -67,6 +68,15 @@ func isTP5OrOlder() bool {
// InitFilter returns a new Windows storage filter driver.
func InitFilter(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
logrus.Debugf("WindowsGraphDriver InitFilter at %s", home)
fsType, err := getFileSystemType(string(home[0]))
if err != nil {
return nil, err
}
if strings.ToLower(fsType) == "refs" {
return nil, fmt.Errorf("%s is on an ReFS volume - ReFS volumes are not supported", home)
}
d := &Driver{
info: hcsshim.DriverInfo{
HomeDir: home,
@ -78,6 +88,37 @@ func InitFilter(home string, options []string, uidMaps, gidMaps []idtools.IDMap)
return d, nil
}
// win32FromHresult is a helper function to get the win32 error code from an HRESULT
func win32FromHresult(hr uintptr) uintptr {
if hr&0x1fff0000 == 0x00070000 {
return hr & 0xffff
}
return hr
}
// getFileSystemType obtains the type of a file system through GetVolumeInformation
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364993(v=vs.85).aspx
func getFileSystemType(drive string) (fsType string, hr error) {
var (
modkernel32 = syscall.NewLazyDLL("kernel32.dll")
procGetVolumeInformation = modkernel32.NewProc("GetVolumeInformationW")
buf = make([]uint16, 255)
size = syscall.MAX_PATH + 1
)
if len(drive) != 1 {
hr = errors.New("getFileSystemType must be called with a drive letter")
return
}
drive += `:\`
n := uintptr(unsafe.Pointer(nil))
r0, _, _ := syscall.Syscall9(procGetVolumeInformation.Addr(), 8, uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(drive))), n, n, n, n, n, uintptr(unsafe.Pointer(&buf[0])), uintptr(size), 0)
if int32(r0) < 0 {
hr = syscall.Errno(win32FromHresult(r0))
}
fsType = syscall.UTF16ToString(buf)
return
}
// String returns the string representation of a driver. This should match
// the name the graph driver has been registered with.
func (d *Driver) String() string {