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Add copy-on-write support for Linux BTRFS filesystem #952

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Merged
technoweenie merged 2 commits into from
Feb 4, 2016
Merged

Add copy-on-write support for Linux BTRFS filesystem #952

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ea16fd5
Add copy-on-write support for Linux BTRFS filesystem
bozaro Jan 26, 2016
a2f72c9
Fix non linux with cgo build condition
bozaro Jan 29, 2016
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6 changes: 6 additions & 0 deletions lfs/util.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,12 @@ func (w *CallbackReader) Read(p []byte) (int, error) {
}

func CopyWithCallback(writer io.Writer, reader io.Reader, totalSize int64, cb CopyCallback) (int64, error) {
if success, _ := CloneFile(writer, reader); success {
if cb != nil {
cb(totalSize, totalSize, 0)
}
return totalSize, nil
}
if cb == nil {
return io.Copy(writer, reader)
}
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11 changes: 11 additions & 0 deletions lfs/util_generic.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
// +build !linux !cgo

package lfs

import (
"io"
)

func CloneFile(writer io.Writer, reader io.Reader) (bool, error) {
return false, nil
}
35 changes: 35 additions & 0 deletions lfs/util_linux.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,35 @@
// +build linux,cgo

package lfs

/*
#include <sys/ioctl.h>

#undef BTRFS_IOCTL_MAGIC
#define BTRFS_IOCTL_MAGIC 0x94
#undef BTRFS_IOC_CLONE
#define BTRFS_IOC_CLONE _IOW (BTRFS_IOCTL_MAGIC, 9, int)
*/
import "C"

import (
"os"
"io"
"syscall"
)

const (
BtrfsIocClone = C.BTRFS_IOC_CLONE
)

func CloneFile(writer io.Writer, reader io.Reader) (bool, error) {
fdst, fdstFound := writer.(*os.File)
fsrc, fsrcFound := reader.(*os.File)
if fdstFound && fsrcFound {
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fdst.Fd(), BtrfsIocClone, fsrc.Fd()); err != 0 {
return false, err
}
return true, nil
}
return false, nil
}