fusefrontend_reverse: add comment to newVirtualFile

...and improve and comment variable naming in findLongnameParent.

No semantic changes.

2 files changed, 10 insertions, 4 deletions

diff --git a/internal/fusefrontend_reverse/reverse_longnames.go b/internal/fusefrontend_reverse/reverse_longnames.go
index f1c45ca..0830298 100644
--- a/internal/fusefrontend_reverse/reverse_longnames.go
+++ b/internal/fusefrontend_reverse/reverse_longnames.go
@@ -84,18 +84,20 @@ func (rfs *ReverseFS) findLongnameParent(dir string, dirIV []byte, longname stri
 func (rfs *ReverseFS) newNameFile(relPath string) (nodefs.File, fuse.Status) {
 	dotName := filepath.Base(relPath)                                    // gocryptfs.longname.XYZ.name
 	longname := dotName[:len(dotName)-len(nametransform.LongNameSuffix)] // gocryptfs.longname.XYZ
-
+	// cipher directory
 	cDir := saneDir(relPath)
+	// plain directory
 	pDir, err := rfs.decryptPath(cDir)
 	if err != nil {
 		return nil, fuse.ToStatus(err)
 	}
 	dirIV := derivePathIV(cDir, ivPurposeDirIV)
-	e, err := rfs.findLongnameParent(pDir, dirIV, longname)
+	// plain name
+	pName, err := rfs.findLongnameParent(pDir, dirIV, longname)
 	if err != nil {
 		return nil, fuse.ToStatus(err)
 	}
-	content := []byte(rfs.nameTransform.EncryptName(e, dirIV))
-	parentFile := filepath.Join(rfs.args.Cipherdir, pDir, e)
+	content := []byte(rfs.nameTransform.EncryptName(pName, dirIV))
+	parentFile := filepath.Join(rfs.args.Cipherdir, pDir, pName)
 	return rfs.newVirtualFile(content, parentFile)
 }
diff --git a/internal/fusefrontend_reverse/virtualfile.go b/internal/fusefrontend_reverse/virtualfile.go
index 04de634..d5c4491 100644
--- a/internal/fusefrontend_reverse/virtualfile.go
+++ b/internal/fusefrontend_reverse/virtualfile.go
@@ -28,6 +28,10 @@ type virtualFile struct {
 	ino uint64
 }
 
+// newVirtualFile creates a new in-memory file that does not have a representation
+// on disk. "content" is the file content. Timestamps and file owner are copied
+// from "parentFile" (absolute plaintext path). For a "gocryptfs.diriv" file, you
+// would use the parent directory as "parentFile".
 func (rfs *ReverseFS) newVirtualFile(content []byte, parentFile string) (nodefs.File, fuse.Status) {
 	return &virtualFile{
 		File:       nodefs.NewDefaultFile(),