From 777b95f82ffea8a25b95089343b07b29378110da Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 26 Jul 2020 18:35:12 +0200
Subject: v2api: delete (most) fusefrontend v1 files

All the functionality in these files has been reimplemented
for the v2 api. Drop the old files.
---
 internal/fusefrontend/file_holes.go | 92 -------------------------------------
 1 file changed, 92 deletions(-)
 delete mode 100644 internal/fusefrontend/file_holes.go

(limited to 'internal/fusefrontend/file_holes.go')

diff --git a/internal/fusefrontend/file_holes.go b/internal/fusefrontend/file_holes.go
deleted file mode 100644
index 2b7564e..0000000
--- a/internal/fusefrontend/file_holes.go
+++ /dev/null
@@ -1,92 +0,0 @@
-package fusefrontend
-
-// Helper functions for sparse files (files with holes)
-
-import (
-	"runtime"
-	"syscall"
-
-	"github.com/hanwen/go-fuse/v2/fuse"
-
-	"github.com/rfjakob/gocryptfs/internal/tlog"
-)
-
-// Will a write to plaintext offset "targetOff" create a file hole in the
-// ciphertext? If yes, zero-pad the last ciphertext block.
-func (f *File) writePadHole(targetOff int64) fuse.Status {
-	// Get the current file size.
-	fi, err := f.fd.Stat()
-	if err != nil {
-		tlog.Warn.Printf("checkAndPadHole: Fstat failed: %v", err)
-		return fuse.ToStatus(err)
-	}
-	plainSize := f.contentEnc.CipherSizeToPlainSize(uint64(fi.Size()))
-	// Appending a single byte to the file (equivalent to writing to
-	// offset=plainSize) would write to "nextBlock".
-	nextBlock := f.contentEnc.PlainOffToBlockNo(plainSize)
-	// targetBlock is the block the user wants to write to.
-	targetBlock := f.contentEnc.PlainOffToBlockNo(uint64(targetOff))
-	// The write goes into an existing block or (if the last block was full)
-	// starts a new one directly after the last block. Nothing to do.
-	if targetBlock <= nextBlock {
-		return fuse.OK
-	}
-	// The write goes past the next block. nextBlock has
-	// to be zero-padded to the block boundary and (at least) nextBlock+1
-	// will contain a file hole in the ciphertext.
-	status := f.zeroPad(plainSize)
-	if status != fuse.OK {
-		return status
-	}
-	return fuse.OK
-}
-
-// Zero-pad the file of size plainSize to the next block boundary. This is a no-op
-// if the file is already block-aligned.
-func (f *File) zeroPad(plainSize uint64) fuse.Status {
-	lastBlockLen := plainSize % f.contentEnc.PlainBS()
-	if lastBlockLen == 0 {
-		// Already block-aligned
-		return fuse.OK
-	}
-	missing := f.contentEnc.PlainBS() - lastBlockLen
-	pad := make([]byte, missing)
-	tlog.Debug.Printf("zeroPad: Writing %d bytes\n", missing)
-	_, status := f.doWrite(pad, int64(plainSize))
-	return status
-}
-
-// SeekData calls the lseek syscall with SEEK_DATA. It returns the offset of the
-// next data bytes, skipping over file holes.
-func (f *File) SeekData(oldOffset int64) (int64, error) {
-	if runtime.GOOS != "linux" {
-		// Does MacOS support something like this?
-		return 0, syscall.EOPNOTSUPP
-	}
-	const SEEK_DATA = 3
-
-	// Convert plaintext offset to ciphertext offset and round down to the
-	// start of the current block. File holes smaller than a full block will
-	// be ignored.
-	blockNo := f.contentEnc.PlainOffToBlockNo(uint64(oldOffset))
-	oldCipherOff := int64(f.contentEnc.BlockNoToCipherOff(blockNo))
-
-	// Determine the next data offset. If the old offset points to (or beyond)
-	// the end of the file, the Seek syscall fails with syscall.ENXIO.
-	newCipherOff, err := syscall.Seek(f.intFd(), oldCipherOff, SEEK_DATA)
-	if err != nil {
-		return 0, err
-	}
-
-	// Convert ciphertext offset back to plaintext offset. At this point,
-	// newCipherOff should always be >= contentenc.HeaderLen. Round down,
-	// but ensure that the result is never smaller than the initial offset
-	// (to avoid endless loops).
-	blockNo = f.contentEnc.CipherOffToBlockNo(uint64(newCipherOff))
-	newOffset := int64(f.contentEnc.BlockNoToPlainOff(blockNo))
-	if newOffset < oldOffset {
-		newOffset = oldOffset
-	}
-
-	return newOffset, nil
-}
-- 
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