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f0b5c0ec7c
This change adopts the upstream fix in this regard at https://go-review.googlesource.com/#/c/41834/ for Minio's purposes. Go's current os.Stat() lacks support for lot of strange windows files such as - share symlinks on SMB2 - symlinks on docker nanoserver - de-duplicated files on NTFS de-duplicated volume. This PR attempts to incorporate the change mentioned here https://blogs.msdn.microsoft.com/oldnewthing/20100212-00/?p=14963/ The article suggests to use Windows I/O manager to dereference the symbolic link. Fixes #4122
96 lines
3.4 KiB
Go
96 lines
3.4 KiB
Go
// +build windows
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/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package disk
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import (
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"syscall"
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"unsafe"
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os2 "github.com/minio/minio/pkg/x/os"
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)
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var (
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kernel32 = syscall.NewLazyDLL("kernel32.dll")
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// GetDiskFreeSpaceEx - https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspx
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// Retrieves information about the amount of space that is available on a disk volume,
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// which is the total amount of space, the total amount of free space, and the total
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// amount of free space available to the user that is associated with the calling thread.
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GetDiskFreeSpaceEx = kernel32.NewProc("GetDiskFreeSpaceExW")
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// GetDiskFreeSpace - https://msdn.microsoft.com/en-us/library/windows/desktop/aa364935(v=vs.85).aspx
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// Retrieves information about the specified disk, including the amount of free space on the disk.
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GetDiskFreeSpace = kernel32.NewProc("GetDiskFreeSpaceW")
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)
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// GetInfo returns total and free bytes available in a directory, e.g. `C:\`.
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// It returns free space available to the user (including quota limitations)
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//
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// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspx
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func GetInfo(path string) (info Info, err error) {
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// Stat to know if the path exists.
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if _, err = os2.Stat(path); err != nil {
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return Info{}, err
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}
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lpFreeBytesAvailable := int64(0)
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lpTotalNumberOfBytes := int64(0)
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lpTotalNumberOfFreeBytes := int64(0)
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// Extract values safely
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// BOOL WINAPI GetDiskFreeSpaceEx(
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// _In_opt_ LPCTSTR lpDirectoryName,
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// _Out_opt_ PULARGE_INTEGER lpFreeBytesAvailable,
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// _Out_opt_ PULARGE_INTEGER lpTotalNumberOfBytes,
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// _Out_opt_ PULARGE_INTEGER lpTotalNumberOfFreeBytes
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// );
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_, _, _ = GetDiskFreeSpaceEx.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
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uintptr(unsafe.Pointer(&lpFreeBytesAvailable)),
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uintptr(unsafe.Pointer(&lpTotalNumberOfBytes)),
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uintptr(unsafe.Pointer(&lpTotalNumberOfFreeBytes)))
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info = Info{}
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info.Total = int64(lpTotalNumberOfBytes)
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info.Free = int64(lpFreeBytesAvailable)
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info.FSType = getFSType(path)
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// Return values of GetDiskFreeSpace()
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lpSectorsPerCluster := uint32(0)
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lpBytesPerSector := uint32(0)
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lpNumberOfFreeClusters := uint32(0)
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lpTotalNumberOfClusters := uint32(0)
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// Extract values safely
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// BOOL WINAPI GetDiskFreeSpace(
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// _In_ LPCTSTR lpRootPathName,
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// _Out_ LPDWORD lpSectorsPerCluster,
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// _Out_ LPDWORD lpBytesPerSector,
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// _Out_ LPDWORD lpNumberOfFreeClusters,
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// _Out_ LPDWORD lpTotalNumberOfClusters
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// );
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_, _, _ = GetDiskFreeSpace.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
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uintptr(unsafe.Pointer(&lpSectorsPerCluster)),
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uintptr(unsafe.Pointer(&lpBytesPerSector)),
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uintptr(unsafe.Pointer(&lpNumberOfFreeClusters)),
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uintptr(unsafe.Pointer(&lpTotalNumberOfClusters)))
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info.Files = int64(lpTotalNumberOfClusters)
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info.Ffree = int64(lpNumberOfFreeClusters)
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return info, nil
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}
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