fusefrontend_reverse: use inomap for inode number translation

Gets rid of static inode number value limitations.

Fixes https://github.com/rfjakob/gocryptfs/issues/457

1 files changed, 17 insertions, 9 deletions

diff --git a/internal/inomap/qino.go b/internal/inomap/qino.go
index a74a96d..ed514e8 100644
--- a/internal/inomap/qino.go
+++ b/internal/inomap/qino.go
@@ -7,9 +7,11 @@ import (
 type namespaceData struct {
 	// Stat_t.Dev is uint64 on 32- and 64-bit Linux
 	Dev uint64
-	// Flags acts like an extension of the Dev field.
+	// Tag acts like an extension of the Dev field.
 	// It is used by reverse mode for virtual files.
-	Flags uint8
+	// Normal (forward) mode does not use it and it
+	// stays always zero there.
+	Tag uint8
 }
 
 // QIno = Qualified Inode number.
@@ -21,15 +23,21 @@ type QIno struct {
 	Ino uint64
 }
 
-// QInoFromStat fills a new QIno struct with the passed Stat_t info.
-func QInoFromStat(st *syscall.Stat_t) QIno {
+// NewQIno returns a filled QIno struct
+func NewQIno(dev uint64, tag uint8, ino uint64) QIno {
 	return QIno{
 		namespaceData: namespaceData{
-			// There are some architectures that use 32-bit values here
-			// (darwin, freebsd-32, maybe others). Add an explicit cast to make
-			// this function work everywhere.
-			Dev: uint64(st.Dev),
+			Dev: dev,
+			Tag: tag,
 		},
-		Ino: uint64(st.Ino),
+		Ino: ino,
 	}
 }
+
+// QInoFromStat fills a new QIno struct with the passed Stat_t info.
+func QInoFromStat(st *syscall.Stat_t) QIno {
+	// There are some architectures that use 32-bit values here
+	// (darwin, freebsd-32, maybe others). Add an explicit cast to make
+	// this function work everywhere.
+	return NewQIno(uint64(st.Dev), 0, uint64(st.Ino))
+}