From 85297cda97d018b514361a2088a78f50f1446f95 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Tue, 24 Jan 2023 22:07:28 +0100
Subject: fusefrontend: doWrite: report readFileID errors as I/O error

It used to be reported as "function not implemented", accompanied
with this log output:

  go-fuse: can't convert error type: ParseHeader: header is all-zero. Header hexdump: 000000000000000000000000000000000000

Now we report EIO and log this:

  doWrite 1372183: corrupt header: ParseHeader: header is all-zero. Header hexdump: 000000000000000000000000000000000000
---
 internal/fusefrontend/file.go | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'internal')

diff --git a/internal/fusefrontend/file.go b/internal/fusefrontend/file.go
index 2f111fd..ff26a6e 100644
--- a/internal/fusefrontend/file.go
+++ b/internal/fusefrontend/file.go
@@ -273,6 +273,10 @@ func (f *File) doWrite(data []byte, off int64) (uint32, syscall.Errno) {
 		if err == io.EOF {
 			fileID, err = f.createHeader()
 			fileWasEmpty = true
+		} else if err != nil {
+			// Other errors mean readFileID() found a corrupt header
+			tlog.Warn.Printf("doWrite %d: corrupt header: %v", f.qIno.Ino, err)
+			return 0, syscall.EIO
 		}
 		if err != nil {
 			return 0, fs.ToErrno(err)
-- 
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