From 6d4f1a6888cafd218cb97bd11de6a7553d9bc8f1 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 9 Aug 2020 22:11:46 +0200
Subject: v2api/reverse: implement Read

---
 internal/fusefrontend_reverse/virtualfile.go | 115 ---------------------------
 1 file changed, 115 deletions(-)
 delete mode 100644 internal/fusefrontend_reverse/virtualfile.go

(limited to 'internal/fusefrontend_reverse/virtualfile.go')

diff --git a/internal/fusefrontend_reverse/virtualfile.go b/internal/fusefrontend_reverse/virtualfile.go
deleted file mode 100644
index a7f6913..0000000
--- a/internal/fusefrontend_reverse/virtualfile.go
+++ /dev/null
@@ -1,115 +0,0 @@
-package fusefrontend_reverse
-
-import (
-	"context"
-	"log"
-	"syscall"
-
-	"github.com/hanwen/go-fuse/v2/fs"
-	"github.com/hanwen/go-fuse/v2/fuse"
-
-	"github.com/rfjakob/gocryptfs/internal/configfile"
-	"github.com/rfjakob/gocryptfs/internal/inomap"
-	"github.com/rfjakob/gocryptfs/internal/nametransform"
-)
-
-const (
-	// virtualFileMode is the mode to use for virtual files (gocryptfs.diriv and
-	// *.name). They are always readable, as stated in func Access
-	virtualFileMode = syscall.S_IFREG | 0444
-	// We use inomap's `Tag` feature to generate unique inode numbers for
-	// virtual files. These are the tags we use.
-	inoTagDirIV    = 1
-	inoTagNameFile = 2
-)
-
-type fileType int
-
-// Values returned by lookupFileType
-const (
-	// A real file/directory/symlink in the backing plaintext directory
-	typeReal fileType = iota
-	// A DirIV (gocryptfs.diriv) file
-	typeDiriv
-	// A gocryptfs.longname.*.name file for a file with a long name
-	typeName
-	// The config file gocryptfs.conf
-	typeConfig
-)
-
-// lookupFileType returns the type of child file name
-// (one of the fileType constants above). Called from Lookup().
-func (n *Node) lookupFileType(cName string) fileType {
-	rn := n.rootNode()
-	// In -plaintextname mode, neither diriv nor longname files exist.
-	if !rn.args.PlaintextNames {
-		// Is it a gocryptfs.diriv file?
-		if cName == nametransform.DirIVFilename {
-			return typeDiriv
-		}
-		// Is it a gocryptfs.longname.*.name file?
-		if t := nametransform.NameType(cName); t == nametransform.LongNameFilename {
-			return typeName
-		}
-	}
-	// gocryptfs.conf in the root directory. This is passed through to
-	// .gocryptfs.reverse.conf in the backing plaintext directory.
-	if n.isRoot() && !rn.args.ConfigCustom && cName == configfile.ConfDefaultName {
-		return typeConfig
-	}
-	return typeReal
-}
-
-type virtualFile struct {
-	fs.Inode
-
-	// file content
-	content []byte
-	// attributes for Getattr()
-	attr fuse.Attr
-}
-
-// 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" (file descriptor).
-// For a "gocryptfs.diriv" file, you would use the parent directory as
-// "parentFile".
-func (n *Node) newVirtualFile(content []byte, parentStat *syscall.Stat_t, inoTag uint8) (vf *virtualFile, errno syscall.Errno) {
-	if inoTag == 0 {
-		log.Panicf("BUG: inoTag for virtual file is zero - this will cause ino collisions!")
-	}
-
-	// Adjust inode number and size
-	rn := n.rootNode()
-	st := parentStat
-	q := inomap.NewQIno(uint64(st.Dev), inoTag, uint64(st.Ino))
-	st.Ino = rn.inoMap.Translate(q)
-	st.Size = int64(len(content))
-	st.Mode = virtualFileMode
-	st.Nlink = 1
-	var a fuse.Attr
-	a.FromStat(st)
-
-	vf = &virtualFile{content: content, attr: a}
-	return
-}
-
-// Open - FUSE call
-func (f *virtualFile) Open(ctx context.Context, flags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
-	return nil, fuse.FOPEN_KEEP_CACHE, 0
-}
-
-// GetAttr - FUSE call
-func (f *virtualFile) Getattr(ctx context.Context, fh fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
-	out.Attr = f.attr
-	return 0
-}
-
-// Read - FUSE call
-func (f *virtualFile) Read(ctx context.Context, fh fs.FileHandle, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
-	end := int(off) + len(dest)
-	if end > len(f.content) {
-		end = len(f.content)
-	}
-	return fuse.ReadResultData(f.content[off:end]), 0
-}
-- 
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