fusefrontend: aessiv: enable deterministiv file id and block ivdet

Seems to work ok:

 $ echo aaaaaaaaaaaaaaaaaaa > b/foo
 $ gocryptfs-xray a/LAh7EiK-kjleJhStVZ1JGg
 Header: Version: 2, Id: 8d76d368438112fb00cb807fa8210a74
 Block  0: IV: b05bb152f77816678230885d09a4a596, Tag: c1c7d580fe01dd1eb543efd9d8eda8ad, Offset:    18 Len: 52
 $ > b/foo
 $ echo aaaaaaaaaaaaaaaaaaa > b/foo
 $ gocryptfs-xray a/LAh7EiK-kjleJhStVZ1JGg
 Header: Version: 2, Id: 8d76d368438112fb00cb807fa8210a74
 Block  0: IV: b05bb152f77816678230885d09a4a596, Tag: c1c7d580fe01dd1eb543efd9d8eda8ad, Offset:    18 Len: 52

Deterministic diriv generation is still missing.

Part of https://github.com/rfjakob/gocryptfs/issues/108

1 files changed, 7 insertions, 6 deletions

diff --git a/internal/fusefrontend/fs.go b/internal/fusefrontend/fs.go
index c589302..40b6d2d 100644
--- a/internal/fusefrontend/fs.go
+++ b/internal/fusefrontend/fs.go
@@ -100,11 +100,12 @@ func (fs *FS) Open(path string, flags uint32, context *fuse.Context) (fuseFile n
 		return nil, fuse.EPERM
 	}
 	newFlags := fs.mangleOpenFlags(flags)
-	cPath, err := fs.getBackingPath(path)
+	cRelPath, err := fs.encryptPath(path)
 	if err != nil {
-		tlog.Debug.Printf("Open: getBackingPath: %v", err)
+		tlog.Debug.Printf("Open: encryptPath: %v", err)
 		return nil, fuse.ToStatus(err)
 	}
+	cPath := filepath.Join(fs.args.Cipherdir, cRelPath)
 	tlog.Debug.Printf("Open: %s", cPath)
 	f, err := os.OpenFile(cPath, newFlags, 0666)
 	if err != nil {
@@ -116,8 +117,7 @@ func (fs *FS) Open(path string, flags uint32, context *fuse.Context) (fuseFile n
 		}
 		return nil, fuse.ToStatus(err)
 	}
-
-	return NewFile(f, fs)
+	return NewFile(f, fs, cRelPath)
 }
 
 // Create implements pathfs.Filesystem.
@@ -126,10 +126,11 @@ func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Conte
 		return nil, fuse.EPERM
 	}
 	newFlags := fs.mangleOpenFlags(flags)
-	cPath, err := fs.getBackingPath(path)
+	cRelPath, err := fs.encryptPath(path)
 	if err != nil {
 		return nil, fuse.ToStatus(err)
 	}
+	cPath := filepath.Join(fs.args.Cipherdir, cRelPath)
 
 	var fd *os.File
 	cName := filepath.Base(cPath)
@@ -171,7 +172,7 @@ func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Conte
 			tlog.Warn.Printf("Create: fd.Chown failed: %v", err)
 		}
 	}
-	return NewFile(fd, fs)
+	return NewFile(fd, fs, path)
 }
 
 // Chmod implements pathfs.Filesystem.