1 files changed, 0 insertions, 227 deletions
diff --git a/internal/fusefrontend/file_allocate_truncate.go b/internal/fusefrontend/file_allocate_truncate.go
deleted file mode 100644
index b6e9150..0000000
--- a/internal/fusefrontend/file_allocate_truncate.go
+++ /dev/null
@@ -1,227 +0,0 @@
-package fusefrontend
-
-// FUSE operations Truncate and Allocate on file handles
-// i.e. ftruncate and fallocate
-
-import (
-	"log"
-	"sync"
-	"syscall"
-
-	"github.com/hanwen/go-fuse/v2/fuse"
-
-	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
-	"github.com/rfjakob/gocryptfs/internal/tlog"
-)
-
-// FALLOC_DEFAULT is a "normal" fallocate operation
-const FALLOC_DEFAULT = 0x00
-
-// FALLOC_FL_KEEP_SIZE allocates disk space while not modifying the file size
-const FALLOC_FL_KEEP_SIZE = 0x01
-
-// Only warn once
-var allocateWarnOnce sync.Once
-
-// Allocate - FUSE call for fallocate(2)
-//
-// mode=FALLOC_FL_KEEP_SIZE is implemented directly.
-//
-// mode=FALLOC_DEFAULT is implemented as a two-step process:
-//
-//   (1) Allocate the space using FALLOC_FL_KEEP_SIZE
-//   (2) Set the file size using ftruncate (via truncateGrowFile)
-//
-// This allows us to reuse the file grow mechanics from Truncate as they are
-// complicated and hard to get right.
-//
-// Other modes (hole punching, zeroing) are not supported.
-func (f *File) Allocate(off uint64, sz uint64, mode uint32) fuse.Status {
-	if mode != FALLOC_DEFAULT && mode != FALLOC_FL_KEEP_SIZE {
-		f := func() {
-			tlog.Info.Printf("fallocate: only mode 0 (default) and 1 (keep size) are supported")
-		}
-		allocateWarnOnce.Do(f)
-		return fuse.Status(syscall.EOPNOTSUPP)
-	}
-
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-	if f.released {
-		return fuse.EBADF
-	}
-	f.fileTableEntry.ContentLock.Lock()
-	defer f.fileTableEntry.ContentLock.Unlock()
-
-	blocks := f.contentEnc.ExplodePlainRange(off, sz)
-	firstBlock := blocks[0]
-	lastBlock := blocks[len(blocks)-1]
-
-	// Step (1): Allocate the space the user wants using FALLOC_FL_KEEP_SIZE.
-	// This will fill file holes and/or allocate additional space past the end of
-	// the file.
-	cipherOff := firstBlock.BlockCipherOff()
-	cipherSz := lastBlock.BlockCipherOff() - cipherOff +
-		f.contentEnc.BlockOverhead() + lastBlock.Skip + lastBlock.Length
-	err := syscallcompat.Fallocate(f.intFd(), FALLOC_FL_KEEP_SIZE, int64(cipherOff), int64(cipherSz))
-	tlog.Debug.Printf("Allocate off=%d sz=%d mode=%x cipherOff=%d cipherSz=%d\n",
-		off, sz, mode, cipherOff, cipherSz)
-	if err != nil {
-		return fuse.ToStatus(err)
-	}
-	if mode == FALLOC_FL_KEEP_SIZE {
-		// The user did not want to change the apparent size. We are done.
-		return fuse.OK
-	}
-	// Step (2): Grow the apparent file size
-	// We need the old file size to determine if we are growing the file at all.
-	newPlainSz := off + sz
-	oldPlainSz, err := f.statPlainSize()
-	if err != nil {
-		return fuse.ToStatus(err)
-	}
-	if newPlainSz <= oldPlainSz {
-		// The new size is smaller (or equal). Fallocate with mode = 0 never
-		// truncates a file, so we are done.
-		return fuse.OK
-	}
-	// The file grows. The space has already been allocated in (1), so what is
-	// left to do is to pad the first and last block and call truncate.
-	// truncateGrowFile does just that.
-	return f.truncateGrowFile(oldPlainSz, newPlainSz)
-}
-
-// Truncate - FUSE call
-func (f *File) Truncate(newSize uint64) fuse.Status {
-	f.fdLock.RLock()
-	defer f.fdLock.RUnlock()
-	if f.released {
-		// The file descriptor has been closed concurrently.
-		tlog.Warn.Printf("ino%d fh%d: Truncate on released file", f.qIno.Ino, f.intFd())
-		return fuse.EBADF
-	}
-	f.fileTableEntry.ContentLock.Lock()
-	defer f.fileTableEntry.ContentLock.Unlock()
-	var err error
-	// Common case first: Truncate to zero
-	if newSize == 0 {
-		err = syscall.Ftruncate(int(f.fd.Fd()), 0)
-		if err != nil {
-			tlog.Warn.Printf("ino%d fh%d: Ftruncate(fd, 0) returned error: %v", f.qIno.Ino, f.intFd(), err)
-			return fuse.ToStatus(err)
-		}
-		// Truncate to zero kills the file header
-		f.fileTableEntry.ID = nil
-		return fuse.OK
-	}
-	// We need the old file size to determine if we are growing or shrinking
-	// the file
-	oldSize, err := f.statPlainSize()
-	if err != nil {
-		return fuse.ToStatus(err)
-	}
-
-	oldB := float32(oldSize) / float32(f.contentEnc.PlainBS())
-	newB := float32(newSize) / float32(f.contentEnc.PlainBS())
-	tlog.Debug.Printf("ino%d: FUSE Truncate from %.2f to %.2f blocks (%d to %d bytes)", f.qIno.Ino, oldB, newB, oldSize, newSize)
-
-	// File size stays the same - nothing to do
-	if newSize == oldSize {
-		return fuse.OK
-	}
-	// File grows
-	if newSize > oldSize {
-		return f.truncateGrowFile(oldSize, newSize)
-	}
-
-	// 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(nil, plainOff, lastBlockLen)
-		if status != fuse.OK {
-			tlog.Warn.Printf("Truncate: shrink doRead returned error: %v", err)
-			return status
-		}
-	}
-	// Truncate down to the last complete block
-	err = syscall.Ftruncate(int(f.fd.Fd()), int64(cipherOff))
-	if err != nil {
-		tlog.Warn.Printf("Truncate: 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
-}
-
-// statPlainSize stats the file and returns the plaintext size
-func (f *File) statPlainSize() (uint64, error) {
-	fi, err := f.fd.Stat()
-	if err != nil {
-		tlog.Warn.Printf("ino%d fh%d: statPlainSize: %v", f.qIno.Ino, f.intFd(), err)
-		return 0, err
-	}
-	cipherSz := uint64(fi.Size())
-	plainSz := uint64(f.contentEnc.CipherSizeToPlainSize(cipherSz))
-	return plainSz, nil
-}
-
-// truncateGrowFile extends a file using seeking or ftruncate performing RMW on
-// the first and last block as necessary. New blocks in the middle become
-// file holes unless they have been fallocate()'d beforehand.
-func (f *File) truncateGrowFile(oldPlainSz uint64, newPlainSz uint64) fuse.Status {
-	if newPlainSz <= oldPlainSz {
-		log.Panicf("BUG: newSize=%d <= oldSize=%d", newPlainSz, oldPlainSz)
-	}
-	newEOFOffset := newPlainSz - 1
-	if oldPlainSz > 0 {
-		n1 := f.contentEnc.PlainOffToBlockNo(oldPlainSz - 1)
-		n2 := f.contentEnc.PlainOffToBlockNo(newEOFOffset)
-		// The file is grown within one block, no need to pad anything.
-		// Write a single zero to the last byte and let doWrite figure out the RMW.
-		if n1 == n2 {
-			buf := make([]byte, 1)
-			_, status := f.doWrite(buf, int64(newEOFOffset))
-			return status
-		}
-	}
-	// The truncate creates at least one new block.
-	//
-	// Make sure the old last block is padded to the block boundary. This call
-	// is a no-op if it is already block-aligned.
-	status := f.zeroPad(oldPlainSz)
-	if !status.Ok() {
-		return status
-	}
-	// The new size is block-aligned. In this case we can do everything ourselves
-	// and avoid the call to doWrite.
-	if newPlainSz%f.contentEnc.PlainBS() == 0 {
-		// The file was empty, so it did not have a header. Create one.
-		if oldPlainSz == 0 {
-			id, err := f.createHeader()
-			if err != nil {
-				return fuse.ToStatus(err)
-			}
-			f.fileTableEntry.ID = id
-		}
-		cSz := int64(f.contentEnc.PlainSizeToCipherSize(newPlainSz))
-		err := syscall.Ftruncate(f.intFd(), cSz)
-		if err != nil {
-			tlog.Warn.Printf("Truncate: grow Ftruncate returned error: %v", err)
-		}
-		return fuse.ToStatus(err)
-	}
-	// The new size is NOT aligned, so we need to write a partial block.
-	// Write a single zero to the last byte and let doWrite figure it out.
-	buf := make([]byte, 1)
-	_, status = f.doWrite(buf, int64(newEOFOffset))
-	return status
-}