diff options
Diffstat (limited to 'internal/fusefrontend_reverse/virtualfile.go')
-rw-r--r-- | internal/fusefrontend_reverse/virtualfile.go | 115 |
1 files changed, 0 insertions, 115 deletions
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 -} |