diff --git a/internal/restorer/preallocate_darwin.go b/internal/fs/preallocate_darwin.go
similarity index 87%
rename from internal/restorer/preallocate_darwin.go
rename to internal/fs/preallocate_darwin.go
index ae6e5ee3e..af46e971b 100644
--- a/internal/restorer/preallocate_darwin.go
+++ b/internal/fs/preallocate_darwin.go
@@ -1,4 +1,4 @@
-package restorer
+package fs
 
 import (
 	"os"
@@ -6,7 +6,7 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-func preallocateFile(wr *os.File, size int64) error {
+func PreallocateFile(wr *os.File, size int64) error {
 	// try contiguous first
 	fst := unix.Fstore_t{
 		Flags:   unix.F_ALLOCATECONTIG | unix.F_ALLOCATEALL,
diff --git a/internal/restorer/preallocate_linux.go b/internal/fs/preallocate_linux.go
similarity index 76%
rename from internal/restorer/preallocate_linux.go
rename to internal/fs/preallocate_linux.go
index dc73ddfe2..30b9e4644 100644
--- a/internal/restorer/preallocate_linux.go
+++ b/internal/fs/preallocate_linux.go
@@ -1,4 +1,4 @@
-package restorer
+package fs
 
 import (
 	"os"
@@ -6,7 +6,7 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-func preallocateFile(wr *os.File, size int64) error {
+func PreallocateFile(wr *os.File, size int64) error {
 	if size <= 0 {
 		return nil
 	}
diff --git a/internal/restorer/preallocate_other.go b/internal/fs/preallocate_other.go
similarity index 73%
rename from internal/restorer/preallocate_other.go
rename to internal/fs/preallocate_other.go
index f01757bf4..4fb44d421 100644
--- a/internal/restorer/preallocate_other.go
+++ b/internal/fs/preallocate_other.go
@@ -1,11 +1,11 @@
 //go:build !linux && !darwin
 // +build !linux,!darwin
 
-package restorer
+package fs
 
 import "os"
 
-func preallocateFile(wr *os.File, size int64) error {
+func PreallocateFile(wr *os.File, size int64) error {
 	// Maybe truncate can help?
 	// Windows: This calls SetEndOfFile which preallocates space on disk
 	return wr.Truncate(size)
diff --git a/internal/restorer/preallocate_test.go b/internal/fs/preallocate_test.go
similarity index 85%
rename from internal/restorer/preallocate_test.go
rename to internal/fs/preallocate_test.go
index 0cc2b3f5d..9dabd2f36 100644
--- a/internal/restorer/preallocate_test.go
+++ b/internal/fs/preallocate_test.go
@@ -1,4 +1,4 @@
-package restorer
+package fs
 
 import (
 	"os"
@@ -7,7 +7,6 @@ import (
 	"syscall"
 	"testing"
 
-	"github.com/restic/restic/internal/fs"
 	"github.com/restic/restic/internal/test"
 )
 
@@ -23,7 +22,7 @@ func TestPreallocate(t *testing.T) {
 				test.OK(t, wr.Close())
 			}()
 
-			err = preallocateFile(wr, i)
+			err = PreallocateFile(wr, i)
 			if err == syscall.ENOTSUP {
 				t.SkipNow()
 			}
@@ -32,7 +31,7 @@ func TestPreallocate(t *testing.T) {
 			fi, err := wr.Stat()
 			test.OK(t, err)
 
-			efi := fs.ExtendedStat(fi)
+			efi := ExtendedStat(fi)
 			test.Assert(t, efi.Size == i || efi.Blocks > 0, "Preallocated size of %v, got size %v block %v", i, efi.Size, efi.Blocks)
 		})
 	}
diff --git a/internal/restorer/fileswriter.go b/internal/restorer/fileswriter.go
index 0a26101f4..589aa502a 100644
--- a/internal/restorer/fileswriter.go
+++ b/internal/restorer/fileswriter.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/cespare/xxhash/v2"
 	"github.com/restic/restic/internal/debug"
+	"github.com/restic/restic/internal/fs"
 )
 
 // writes blobs to target files.
@@ -72,7 +73,7 @@ func (w *filesWriter) writeToFile(path string, blob []byte, offset int64, create
 					return nil, err
 				}
 			} else {
-				err := preallocateFile(wr.File, createSize)
+				err := fs.PreallocateFile(wr.File, createSize)
 				if err != nil {
 					// Just log the preallocate error but don't let it cause the restore process to fail.
 					// Preallocate might return an error if the filesystem (implementation) does not