From 9b9ab672170f1357e3318009316d3c1cfebbbbb2 Mon Sep 17 00:00:00 2001
From: Yannick Ulrich <yannick.ulrich@durham.ac.uk>
Date: Sun, 26 Feb 2023 13:08:14 +0000
Subject: [PATCH] 4. Better error handling

---
 fuse.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fuse.go b/fuse.go
index 7921f97..2a7f6eb 100644
--- a/fuse.go
+++ b/fuse.go
@@ -256,6 +256,10 @@ func (fh *bytesFileWriteHandle) Write(ctx context.Context, data []byte, off int6
 
 var _ = (fs.FileFlusher)((*bytesFileWriteHandle)(nil))
 func (fh *bytesFileWriteHandle) Flush(ctx context.Context) (errno syscall.Errno) {
+	if len(fh.content) == 0 {
+		return 0
+	}
+
 	log.Info("Attempting flush").Str("path", fh.path).Send()
 	fp, err := myfs.Create(fh.path, uint32(len(fh.content)))
 	if err != nil {
@@ -268,6 +272,11 @@ func (fh *bytesFileWriteHandle) Flush(ctx context.Context) (errno syscall.Errno)
 		fp.Close()
 		return syscall.EROFS
 	}
+	if int(nread) != len(fh.content) {
+		log.Error("Flush failed: write").Str("path", fh.path).Int("expect", len(fh.content)).Int("got", int(nread)).Send()
+		fp.Close()
+		return syscall.EROFS
+	}
 	err = fp.Close()
 	if err != nil {
 		log.Error("Flush failed: close").Str("path", fh.path).Err(err).Send()