Attempt to fix the linux ioctl FIDEDUPERANGE

unix/linux/types.go

@@ -473,7 +473,14 @@ type Flock_t C.struct_flock
 
 type FileCloneRange C.struct_file_clone_range
 
-type FileDedupeRange C.struct_file_dedupe_range
+type RawFileDedupeRange C.struct_file_dedupe_range
+
+type RawFileDedupeRangeInfo C.struct_file_dedupe_range_info
+
+const (
+	SizeofRawFileDedupeRange     = C.sizeof_struct_file_dedupe_range
+	SizeofRawFileDedupeRangeInfo = C.sizeof_struct_file_dedupe_range_info
+)
 
 // Filesystem Encryption
 

unix/syscall_linux.go

@@ -137,12 +137,49 @@ func IoctlFileClone(destFd, srcFd int) error {
 	return ioctl(destFd, FICLONE, uintptr(srcFd))
 }
 
+type FileDedupeRange struct {
+	Src_offset uint64
+	Src_length uint64
+	Dest_count uint16
+	Reserved1  uint16
+	Reserved2  uint32
+	Info       []FileDedupeRangeInfo
+}
+
+type FileDedupeRangeInfo struct {
+	Dest_fd       int64
+	Dest_offset   uint64
+	Bytes_deduped uint64
+	Status        int32
+	Reserved      uint32
+}
+
 // IoctlFileDedupeRange performs an FIDEDUPERANGE ioctl operation to share the
 // range of data conveyed in value with the file associated with the file
 // descriptor destFd. See the ioctl_fideduperange(2) man page for details.
-func IoctlFileDedupeRange(destFd int, value *FileDedupeRange) error {
-	err := ioctl(destFd, FIDEDUPERANGE, uintptr(unsafe.Pointer(value)))
-	runtime.KeepAlive(value)
+func IoctlFileDedupeRange(srcFd int, value *FileDedupeRange) error {
+	buf := make([]byte, SizeofRawFileDedupeRange+
+		len(value.Info)*SizeofRawFileDedupeRangeInfo)
+	rawrange := (*FileDedupeRange)(unsafe.Pointer(&buf[0]))
+	rawrange.Src_offset = value.Src_offset
+	rawrange.Src_length = value.Src_length
+	rawrange.Dest_count = uint16(len(value.Info))
+	rawrange.Reserved1 = value.Reserved1
+	rawrange.Reserved2 = value.Reserved2
+
+	for i := range value.Info {
+		rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
+			uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
+				uintptr(SizeofRawFileDedupeRangeInfo)))
+		rawinfo.Dest_fd = value.Info[i].Dest_fd
+		rawinfo.Dest_offset = value.Info[i].Dest_offset
+		rawinfo.Bytes_deduped = value.Info[i].Bytes_deduped
+		rawinfo.Status = value.Info[i].Status
+		rawinfo.Reserved = value.Info[i].Reserved
+	}
+
+	err := ioctl(srcFd, FIDEDUPERANGE, uintptr(unsafe.Pointer(&buf[0])))
+	runtime.KeepAlive(buf)
 	return err
 }
 

unix/ztypes_linux.go

@@ -83,7 +83,7 @@ type FileCloneRange struct {
 	Dest_offset uint64
 }
 
-type FileDedupeRange struct {
+type RawFileDedupeRange struct {
 	Src_offset uint64
 	Src_length uint64
 	Dest_count uint16
@@ -91,6 +91,19 @@ type FileDedupeRange struct {
 	Reserved2  uint32
 }
 
+type RawFileDedupeRangeInfo struct {
+	Dest_fd       int64
+	Dest_offset   uint64
+	Bytes_deduped uint64
+	Status        int32
+	Reserved      uint32
+}
+
+const (
+	SizeofRawFileDedupeRange     = 0x18
+	SizeofRawFileDedupeRangeInfo = 0x20
+)
+
 type FscryptPolicy struct {
 	Version                   uint8
 	Contents_encryption_mode  uint8