From d212b246c5e24e6151bef45ad5a8185fdd12a28f Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 16 Aug 2020 19:58:47 +0200
Subject: v2api/reverse: implement Lseek

---
 internal/fusefrontend/file_holes.go             |  2 +-
 internal/fusefrontend_reverse/file.go           | 11 +++++++++++
 internal/fusefrontend_reverse/file_api_check.go | 23 ++++++++++-------------
 3 files changed, 22 insertions(+), 14 deletions(-)

(limited to 'internal')

diff --git a/internal/fusefrontend/file_holes.go b/internal/fusefrontend/file_holes.go
index 85792f9..0d28004 100644
--- a/internal/fusefrontend/file_holes.go
+++ b/internal/fusefrontend/file_holes.go
@@ -61,7 +61,7 @@ func (f *File) Lseek(ctx context.Context, off uint64, whence uint32) (uint64, sy
 	cipherOff := f.rootNode.contentEnc.PlainSizeToCipherSize(off)
 	newCipherOff, err := syscall.Seek(f.intFd(), int64(cipherOff), int(whence))
 	if err != nil {
-		return uint64(newCipherOff), fs.ToErrno(err)
+		return 0, fs.ToErrno(err)
 	}
 	newOff := f.contentEnc.CipherSizeToPlainSize(uint64(newCipherOff))
 	return newOff, 0
diff --git a/internal/fusefrontend_reverse/file.go b/internal/fusefrontend_reverse/file.go
index 55f5f80..294872f 100644
--- a/internal/fusefrontend_reverse/file.go
+++ b/internal/fusefrontend_reverse/file.go
@@ -68,3 +68,14 @@ func (f *File) Read(ctx context.Context, buf []byte, ioff int64) (resultData fus
 func (f *File) Release(context.Context) syscall.Errno {
 	return fs.ToErrno(f.fd.Close())
 }
+
+// Lseek - FUSE call.
+func (f *File) Lseek(ctx context.Context, off uint64, whence uint32) (uint64, syscall.Errno) {
+	plainOff := f.contentEnc.CipherSizeToPlainSize(off)
+	newPlainOff, err := syscall.Seek(int(f.fd.Fd()), int64(plainOff), int(whence))
+	if err != nil {
+		return 0, fs.ToErrno(err)
+	}
+	newOff := f.contentEnc.PlainSizeToCipherSize(uint64(newPlainOff))
+	return newOff, 0
+}
diff --git a/internal/fusefrontend_reverse/file_api_check.go b/internal/fusefrontend_reverse/file_api_check.go
index 201f1ea..b7e59d4 100644
--- a/internal/fusefrontend_reverse/file_api_check.go
+++ b/internal/fusefrontend_reverse/file_api_check.go
@@ -7,22 +7,19 @@ import (
 // Check that we have implemented the fs.File* interfaces
 var _ = (fs.FileReader)((*File)(nil))
 var _ = (fs.FileReleaser)((*File)(nil))
-
-/* TODO
-var _ = (fs.FileLseeker)((*File2)(nil))
-*/
+var _ = (fs.FileLseeker)((*File)(nil))
 
 /* Not needed
-var _ = (fs.FileGetattrer)((*File2)(nil))
-var _ = (fs.FileGetlker)((*File2)(nil))
-var _ = (fs.FileSetlker)((*File2)(nil))
-var _ = (fs.FileSetlkwer)((*File2)(nil))
+var _ = (fs.FileGetattrer)((*File)(nil))
+var _ = (fs.FileGetlker)((*File)(nil))
+var _ = (fs.FileSetlker)((*File)(nil))
+var _ = (fs.FileSetlkwer)((*File)(nil))
 */
 
 /* Will not implement these - reverse mode is read-only!
-var _ = (fs.FileSetattrer)((*File2)(nil))
-var _ = (fs.FileWriter)((*File2)(nil))
-var _ = (fs.FileFsyncer)((*File2)(nil))
-var _ = (fs.FileFlusher)((*File2)(nil))
-var _ = (fs.FileAllocater)((*File2)(nil))
+var _ = (fs.FileSetattrer)((*File)(nil))
+var _ = (fs.FileWriter)((*File)(nil))
+var _ = (fs.FileFsyncer)((*File)(nil))
+var _ = (fs.FileFlusher)((*File)(nil))
+var _ = (fs.FileAllocater)((*File)(nil))
 */
-- 
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