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lib/file: add Implemented constants

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This commit is contained in:
Nick Craig-Wood
2020-05-19 10:15:20 +01:00
parent 919a180ad2
commit 5cb2a2fa3c
3 changed files with 24 additions and 0 deletions
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8
lib/file/preallocate_other.go
View File

@ -4,11 +4,19 @@ package file
import "os" import "os"
// PreallocateImplemented is a constant indicating whether the
// implementation of Preallocate actually does anything.
const PreallocateImplemented = false
// PreAllocate the file for performance reasons // PreAllocate the file for performance reasons
func PreAllocate(size int64, out *os.File) error { func PreAllocate(size int64, out *os.File) error {
return nil return nil
} }
// SetSparseImplemented is a constant indicating whether the
// implementation of SetSparse actually does anything.
const SetSparseImplemented = false
// SetSparse makes the file be a sparse file // SetSparse makes the file be a sparse file
func SetSparse(out *os.File) error { func SetSparse(out *os.File) error {
return nil return nil

8
lib/file/preallocate_unix.go
View File

@ -18,6 +18,10 @@ var (
fallocFlagsIndex int32 fallocFlagsIndex int32
) )
// PreallocateImplemented is a constant indicating whether the
// implementation of Preallocate actually does anything.
const PreallocateImplemented = true
// PreAllocate the file for performance reasons // PreAllocate the file for performance reasons
func PreAllocate(size int64, out *os.File) error { func PreAllocate(size int64, out *os.File) error {
if size <= 0 { if size <= 0 {
@ -45,6 +49,10 @@ again:
return err return err
} }
// SetSparseImplemented is a constant indicating whether the
// implementation of SetSparse actually does anything.
const SetSparseImplemented = false
// SetSparse makes the file be a sparse file // SetSparse makes the file be a sparse file
func SetSparse(out *os.File) error { func SetSparse(out *os.File) error {
return nil return nil

8
lib/file/preallocate_windows.go
View File

@ -32,6 +32,10 @@ type ioStatusBlock struct {
Status, Information uintptr Status, Information uintptr
} }
// PreallocateImplemented is a constant indicating whether the
// implementation of Preallocate actually does anything.
const PreallocateImplemented = true
// PreAllocate the file for performance reasons // PreAllocate the file for performance reasons
func PreAllocate(size int64, out *os.File) error { func PreAllocate(size int64, out *os.File) error {
if size <= 0 { if size <= 0 {
@ -82,6 +86,10 @@ const (
FSCTL_SET_SPARSE = 0x000900c4 FSCTL_SET_SPARSE = 0x000900c4
) )
// SetSparseImplemented is a constant indicating whether the
// implementation of SetSparse actually does anything.
const SetSparseImplemented = true
// SetSparse makes the file be a sparse file // SetSparse makes the file be a sparse file
func SetSparse(out *os.File) error { func SetSparse(out *os.File) error {
err := syscall.DeviceIoControl(syscall.Handle(out.Fd()), FSCTL_SET_SPARSE, nil, 0, nil, 0, nil, nil) err := syscall.DeviceIoControl(syscall.Handle(out.Fd()), FSCTL_SET_SPARSE, nil, 0, nil, 0, nil, nil)