1 files changed, 0 insertions, 501 deletions
diff --git a/pathfs_frontend/file.go b/pathfs_frontend/file.go
deleted file mode 100644
index 387eb35..0000000
--- a/pathfs_frontend/file.go
+++ /dev/null
@@ -1,501 +0,0 @@
-package pathfs_frontend
-
-// FUSE operations on file handles
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"os"
-	"sync"
-	"syscall"
-	"time"
-
-	"github.com/hanwen/go-fuse/fuse"
-	"github.com/hanwen/go-fuse/fuse/nodefs"
-
-	"github.com/rfjakob/gocryptfs/internal/contentenc"
-	"github.com/rfjakob/gocryptfs/internal/toggledlog"
-)
-
-// File - based on loopbackFile in go-fuse/fuse/nodefs/files.go
-type file struct {
-	fd *os.File
-
-	// fdLock prevents the fd to be closed while we are in the middle of
-	// an operation.
-	// Every FUSE entrypoint should RLock(). The only user of Lock() is
-	// Release(), which closes the fd, hence has to acquire an exclusive lock.
-	fdLock sync.RWMutex
-
-	// Was the file opened O_WRONLY?
-	writeOnly bool
-
-	// Content encryption helper
-	contentEnc *contentenc.ContentEnc
-
-	// Inode number
-	ino uint64
-
-	// File header
-	header *contentenc.FileHeader
-
-	forgotten bool
-}
-
-func NewFile(fd *os.File, writeOnly bool, contentEnc *contentenc.ContentEnc) nodefs.File {
-	var st syscall.Stat_t
-	syscall.Fstat(int(fd.Fd()), &st)
-	wlock.register(st.Ino)
-
-	return &file{
-		fd:        fd,
-		writeOnly: writeOnly,
-		contentEnc: contentEnc,
-		ino:       st.Ino,
-	}
-}
-
-// intFd - return the backing file descriptor as an integer. Used for debug
-// messages.
-func (f *file) intFd() int {
-	return int(f.fd.Fd())
-}
-
-func (f *file) InnerFile() nodefs.File {
-	return nil
-}
-
-func (f *file) SetInode(n *nodefs.Inode) {
-}
-
-// readHeader - load the file header from disk
-//
-// Returns io.EOF if the file is empty
-func (f *file) readHeader() error {
-	buf := make([]byte, contentenc.HEADER_LEN)
-	_, err := f.fd.ReadAt(buf, 0)
-	if err != nil {
-		return err
-	}
-	h, err := contentenc.ParseHeader(buf)
-	if err != nil {
-		return err
-	}
-	f.header = h
-
-	return nil
-}
-
-// createHeader - create a new random header and write it to disk
-func (f *file) createHeader() error {
-	h := contentenc.RandomHeader()
-	buf := h.Pack()
-
-	// Prevent partially written (=corrupt) header by preallocating the space beforehand
-	err := prealloc(int(f.fd.Fd()), 0, contentenc.HEADER_LEN)
-	if err != nil {
-		toggledlog.Warn.Printf("ino%d: createHeader: prealloc failed: %s\n", f.ino, err.Error())
-		return err
-	}
-
-	// Actually write header
-	_, err = f.fd.WriteAt(buf, 0)
-	if err != nil {
-		return err
-	}
-	f.header = h
-
-	return nil
-}
-
-func (f *file) String() string {
-	return fmt.Sprintf("cryptFile(%s)", f.fd.Name())
-}
-
-// doRead - returns "length" plaintext bytes from plaintext offset "off".
-// Arguments "length" and "off" do not have to be block-aligned.
-//
-// doRead reads the corresponding ciphertext blocks from disk, decrypts them and
-// returns the requested part of the plaintext.
-//
-// Called by Read() for normal reading,
-// by Write() and Truncate() for Read-Modify-Write
-func (f *file) doRead(off uint64, length uint64) ([]byte, fuse.Status) {
-
-	// Read file header
-	if f.header == nil {
-		err := f.readHeader()
-		if err == io.EOF {
-			return nil, fuse.OK
-		}
-		if err != nil {
-			return nil, fuse.ToStatus(err)
-		}
-	}
-
-	// Read the backing ciphertext in one go
-	blocks := f.contentEnc.ExplodePlainRange(off, length)
-	alignedOffset, alignedLength := blocks[0].JointCiphertextRange(blocks)
-	skip := blocks[0].Skip
-	toggledlog.Debug.Printf("JointCiphertextRange(%d, %d) -> %d, %d, %d", off, length, alignedOffset, alignedLength, skip)
-	ciphertext := make([]byte, int(alignedLength))
-	n, err := f.fd.ReadAt(ciphertext, int64(alignedOffset))
-	if err != nil && err != io.EOF {
-		toggledlog.Warn.Printf("read: ReadAt: %s", err.Error())
-		return nil, fuse.ToStatus(err)
-	}
-	// Truncate ciphertext buffer down to actually read bytes
-	ciphertext = ciphertext[0:n]
-
-	firstBlockNo := blocks[0].BlockNo
-	toggledlog.Debug.Printf("ReadAt offset=%d bytes (%d blocks), want=%d, got=%d", alignedOffset, firstBlockNo, alignedLength, n)
-
-	// Decrypt it
-	plaintext, err := f.contentEnc.DecryptBlocks(ciphertext, firstBlockNo, f.header.Id)
-	if err != nil {
-		curruptBlockNo := firstBlockNo + f.contentEnc.PlainOffToBlockNo(uint64(len(plaintext)))
-		cipherOff := f.contentEnc.BlockNoToCipherOff(curruptBlockNo)
-		plainOff := f.contentEnc.BlockNoToPlainOff(curruptBlockNo)
-		toggledlog.Warn.Printf("ino%d: doRead: corrupt block #%d (plainOff=%d, cipherOff=%d)",
-			f.ino, curruptBlockNo, plainOff, cipherOff)
-		return nil, fuse.EIO
-	}
-
-	// Crop down to the relevant part
-	var out []byte
-	lenHave := len(plaintext)
-	lenWant := int(skip + length)
-	if lenHave > lenWant {
-		out = plaintext[skip:lenWant]
-	} else if lenHave > int(skip) {
-		out = plaintext[skip:lenHave]
-	}
-	// else: out stays empty, file was smaller than the requested offset
-
-	return out, fuse.OK
-}
-
-// Read - FUSE call
-func (f *file) Read(buf []byte, off int64) (resultData fuse.ReadResult, code fuse.Status) {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-
-	toggledlog.Debug.Printf("ino%d: FUSE Read: offset=%d length=%d", f.ino, len(buf), off)
-
-	if f.writeOnly {
-		toggledlog.Warn.Printf("ino%d: Tried to read from write-only file", f.ino)
-		return nil, fuse.EBADF
-	}
-
-	out, status := f.doRead(uint64(off), uint64(len(buf)))
-
-	if status == fuse.EIO {
-		toggledlog.Warn.Printf("ino%d: Read failed with EIO, offset=%d, length=%d", f.ino, len(buf), off)
-	}
-	if status != fuse.OK {
-		return nil, status
-	}
-
-	toggledlog.Debug.Printf("ino%d: Read: status %v, returning %d bytes", f.ino, status, len(out))
-	return fuse.ReadResultData(out), status
-}
-
-const FALLOC_FL_KEEP_SIZE = 0x01
-
-// doWrite - encrypt "data" and write it to plaintext offset "off"
-//
-// Arguments do not have to be block-aligned, read-modify-write is
-// performed internally as neccessary
-//
-// Called by Write() for normal writing,
-// and by Truncate() to rewrite the last file block.
-func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
-
-	// Read header from disk, create a new one if the file is empty
-	if f.header == nil {
-		err := f.readHeader()
-		if err == io.EOF {
-			err = f.createHeader()
-
-		}
-		if err != nil {
-			return 0, fuse.ToStatus(err)
-		}
-	}
-
-	var written uint32
-	status := fuse.OK
-	dataBuf := bytes.NewBuffer(data)
-	blocks := f.contentEnc.ExplodePlainRange(uint64(off), uint64(len(data)))
-	for _, b := range blocks {
-
-		blockData := dataBuf.Next(int(b.Length))
-
-		// Incomplete block -> Read-Modify-Write
-		if b.IsPartial() {
-			// Read
-			o, _ := b.PlaintextRange()
-			oldData, status := f.doRead(o, f.contentEnc.PlainBS())
-			if status != fuse.OK {
-				toggledlog.Warn.Printf("ino%d fh%d: RMW read failed: %s", f.ino, f.intFd(), status.String())
-				return written, status
-			}
-			// Modify
-			blockData = f.contentEnc.MergeBlocks(oldData, blockData, int(b.Skip))
-			toggledlog.Debug.Printf("len(oldData)=%d len(blockData)=%d", len(oldData), len(blockData))
-		}
-
-		// Encrypt
-		blockOffset, blockLen := b.CiphertextRange()
-		blockData = f.contentEnc.EncryptBlock(blockData, b.BlockNo, f.header.Id)
-		toggledlog.Debug.Printf("ino%d: Writing %d bytes to block #%d",
-			f.ino, uint64(len(blockData))-f.contentEnc.BlockOverhead(), b.BlockNo)
-
-		// Prevent partially written (=corrupt) blocks by preallocating the space beforehand
-		err := prealloc(int(f.fd.Fd()), int64(blockOffset), int64(blockLen))
-		if err != nil {
-			toggledlog.Warn.Printf("ino%d fh%d: doWrite: prealloc failed: %s", f.ino, f.intFd(), err.Error())
-			status = fuse.ToStatus(err)
-			break
-		}
-
-		// Write
-		_, err = f.fd.WriteAt(blockData, int64(blockOffset))
-
-		if err != nil {
-			toggledlog.Warn.Printf("doWrite: Write failed: %s", err.Error())
-			status = fuse.ToStatus(err)
-			break
-		}
-		written += uint32(b.Length)
-	}
-	return written, status
-}
-
-// Write - FUSE call
-func (f *file) Write(data []byte, off int64) (uint32, fuse.Status) {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-	wlock.lock(f.ino)
-	defer wlock.unlock(f.ino)
-
-	toggledlog.Debug.Printf("ino%d: FUSE Write: offset=%d length=%d", f.ino, off, len(data))
-
-	fi, err := f.fd.Stat()
-	if err != nil {
-		toggledlog.Warn.Printf("Write: Fstat failed: %v", err)
-		return 0, fuse.ToStatus(err)
-	}
-	plainSize := f.contentEnc.CipherSizeToPlainSize(uint64(fi.Size()))
-	if f.createsHole(plainSize, off) {
-		status := f.zeroPad(plainSize)
-		if status != fuse.OK {
-			toggledlog.Warn.Printf("zeroPad returned error %v", status)
-			return 0, status
-		}
-	}
-	return f.doWrite(data, off)
-}
-
-// Release - FUSE call, close file
-func (f *file) Release() {
-	f.fdLock.Lock()
-	defer f.fdLock.Unlock()
-
-	f.fd.Close()
-	f.forgotten = true
-}
-
-// Flush - FUSE call
-func (f *file) Flush() fuse.Status {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-
-	// Since Flush() may be called for each dup'd fd, we don't
-	// want to really close the file, we just want to flush. This
-	// is achieved by closing a dup'd fd.
-	newFd, err := syscall.Dup(int(f.fd.Fd()))
-
-	if err != nil {
-		return fuse.ToStatus(err)
-	}
-	err = syscall.Close(newFd)
-	return fuse.ToStatus(err)
-}
-
-func (f *file) Fsync(flags int) (code fuse.Status) {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-
-	return fuse.ToStatus(syscall.Fsync(int(f.fd.Fd())))
-}
-
-// Truncate - FUSE call
-func (f *file) Truncate(newSize uint64) fuse.Status {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-	wlock.lock(f.ino)
-	defer wlock.unlock(f.ino)
-
-	if f.forgotten {
-		toggledlog.Warn.Printf("ino%d fh%d: Truncate on forgotten file", f.ino, f.intFd())
-	}
-
-	// Common case first: Truncate to zero
-	if newSize == 0 {
-		err := syscall.Ftruncate(int(f.fd.Fd()), 0)
-		if err != nil {
-			toggledlog.Warn.Printf("ino%d fh%d: Ftruncate(fd, 0) returned error: %v", f.ino, f.intFd(), err)
-			return fuse.ToStatus(err)
-		}
-		// Truncate to zero kills the file header
-		f.header = nil
-		return fuse.OK
-	}
-
-	// We need the old file size to determine if we are growing or shrinking
-	// the file
-	fi, err := f.fd.Stat()
-	if err != nil {
-		toggledlog.Warn.Printf("ino%d fh%d: Truncate: Fstat failed: %v", f.ino, f.intFd(), err)
-		return fuse.ToStatus(err)
-	}
-	oldSize := f.contentEnc.CipherSizeToPlainSize(uint64(fi.Size()))
-	{
-		oldB := float32(oldSize) / float32(f.contentEnc.PlainBS())
-		newB := float32(newSize) / float32(f.contentEnc.PlainBS())
-		toggledlog.Debug.Printf("ino%d: FUSE Truncate from %.2f to %.2f blocks (%d to %d bytes)", f.ino, oldB, newB, oldSize, newSize)
-	}
-
-	// File size stays the same - nothing to do
-	if newSize == oldSize {
-		return fuse.OK
-	}
-
-	// File grows
-	if newSize > oldSize {
-
-		// File was empty, create new header
-		if oldSize == 0 {
-			err := f.createHeader()
-			if err != nil {
-				return fuse.ToStatus(err)
-			}
-		}
-
-		blocks := f.contentEnc.ExplodePlainRange(oldSize, newSize-oldSize)
-		for _, b := range blocks {
-			// First and last block may be partial
-			if b.IsPartial() {
-				off, _ := b.PlaintextRange()
-				off += b.Skip
-				_, status := f.doWrite(make([]byte, b.Length), int64(off))
-				if status != fuse.OK {
-					return status
-				}
-			} else {
-				off, length := b.CiphertextRange()
-				err := syscall.Ftruncate(int(f.fd.Fd()), int64(off+length))
-				if err != nil {
-					toggledlog.Warn.Printf("grow Ftruncate returned error: %v", err)
-					return fuse.ToStatus(err)
-				}
-			}
-		}
-		return fuse.OK
-	} else {
-		// File shrinks
-		blockNo := f.contentEnc.PlainOffToBlockNo(newSize)
-		cipherOff := f.contentEnc.BlockNoToCipherOff(blockNo)
-		plainOff := f.contentEnc.BlockNoToPlainOff(blockNo)
-		lastBlockLen := newSize - plainOff
-		var data []byte
-		if lastBlockLen > 0 {
-			var status fuse.Status
-			data, status = f.doRead(plainOff, lastBlockLen)
-			if status != fuse.OK {
-				toggledlog.Warn.Printf("shrink doRead returned error: %v", err)
-				return status
-			}
-		}
-		// Truncate down to last complete block
-		err = syscall.Ftruncate(int(f.fd.Fd()), int64(cipherOff))
-		if err != nil {
-			toggledlog.Warn.Printf("shrink Ftruncate returned error: %v", err)
-			return fuse.ToStatus(err)
-		}
-		// Append partial block
-		if lastBlockLen > 0 {
-			_, status := f.doWrite(data, int64(plainOff))
-			return status
-		}
-		return fuse.OK
-	}
-}
-
-func (f *file) Chmod(mode uint32) fuse.Status {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-
-	return fuse.ToStatus(f.fd.Chmod(os.FileMode(mode)))
-}
-
-func (f *file) Chown(uid uint32, gid uint32) fuse.Status {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-
-	return fuse.ToStatus(f.fd.Chown(int(uid), int(gid)))
-}
-
-func (f *file) GetAttr(a *fuse.Attr) fuse.Status {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-
-	toggledlog.Debug.Printf("file.GetAttr()")
-	st := syscall.Stat_t{}
-	err := syscall.Fstat(int(f.fd.Fd()), &st)
-	if err != nil {
-		return fuse.ToStatus(err)
-	}
-	a.FromStat(&st)
-	a.Size = f.contentEnc.CipherSizeToPlainSize(a.Size)
-
-	return fuse.OK
-}
-
-// Allocate - FUSE call, fallocate(2)
-var allocateWarned bool
-
-func (f *file) Allocate(off uint64, sz uint64, mode uint32) fuse.Status {
-	// Only warn once
-	if !allocateWarned {
-		toggledlog.Warn.Printf("fallocate(2) is not supported, returning ENOSYS - see https://github.com/rfjakob/gocryptfs/issues/1")
-		allocateWarned = true
-	}
-	return fuse.ENOSYS
-}
-
-const _UTIME_OMIT = ((1 << 30) - 2)
-
-func (f *file) Utimens(a *time.Time, m *time.Time) fuse.Status {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-
-	ts := make([]syscall.Timespec, 2)
-
-	if a == nil {
-		ts[0].Nsec = _UTIME_OMIT
-	} else {
-		ts[0].Sec = a.Unix()
-	}
-
-	if m == nil {
-		ts[1].Nsec = _UTIME_OMIT
-	} else {
-		ts[1].Sec = m.Unix()
-	}
-
-	fn := fmt.Sprintf("/proc/self/fd/%d", f.fd.Fd())
-	return fuse.ToStatus(syscall.UtimesNano(fn, ts))
-}