diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
index f84993d..c78061a 100644
--- a/filesystem/filesystem.go
+++ b/filesystem/filesystem.go
@@ -397,6 +397,9 @@
 	// to add a dependency on the Output file, as you cannot add dependencies on directories
 	// in ninja.
 	RootDir android.Path
+	// Extra root directories that are also built into the partition. Currently only used for
+	// including the recovery partition files into the vendor_boot image.
+	ExtraRootDirs android.Paths
 	// The rebased staging directory used to build the output filesystem. If consuming this, make
 	// sure to add a dependency on the Output file, as you cannot add dependencies on directories
 	// in ninja. In many cases this is the same as RootDir, only in the system partition is it
@@ -612,6 +615,7 @@
 	var outputHermetic android.WritablePath
 	var buildImagePropFile android.Path
 	var buildImagePropFileDeps android.Paths
+	var extraRootDirs android.Paths
 	switch f.fsType(ctx) {
 	case ext4Type, erofsType, f2fsType:
 		buildImagePropFile, buildImagePropFileDeps = f.buildPropFile(ctx)
@@ -625,9 +629,9 @@
 		f.buildImageUsingBuildImage(ctx, hermeticBuilder, buildImageParams{rootDir, propFileHermetic, buildImagePropFileDeps, outputHermetic})
 		mapFile = f.getMapFile(ctx)
 	case compressedCpioType:
-		f.output = f.buildCpioImage(ctx, builder, rootDir, true)
+		f.output, extraRootDirs = f.buildCpioImage(ctx, builder, rootDir, true)
 	case cpioType:
-		f.output = f.buildCpioImage(ctx, builder, rootDir, false)
+		f.output, extraRootDirs = f.buildCpioImage(ctx, builder, rootDir, false)
 	default:
 		return
 	}
@@ -659,6 +663,7 @@
 		OutputHermetic:         outputHermetic,
 		FileListFile:           fileListFile,
 		RootDir:                rootDir,
+		ExtraRootDirs:          extraRootDirs,
 		RebasedDir:             rebasedDir,
 		MapFile:                mapFile,
 		ModuleName:             ctx.ModuleName(),
@@ -1157,7 +1162,7 @@
 	builder *android.RuleBuilder,
 	rootDir android.OutputPath,
 	compressed bool,
-) android.Path {
+) (android.Path, android.Paths) {
 	if proptools.Bool(f.properties.Use_avb) {
 		ctx.PropertyErrorf("use_avb", "signing compresed cpio image using avbtool is not supported."+
 			"Consider adding this to bootimg module and signing the entire boot image.")
@@ -1197,7 +1202,7 @@
 	// rootDir is not deleted. Might be useful for quick inspection.
 	builder.Build("build_cpio_image", fmt.Sprintf("Creating filesystem %s", f.BaseModuleName()))
 
-	return output
+	return output, rootDirs
 }
 
 var validPartitions = []string{