From c7f1fe301a43604cb2eb9d67f389563e8734016c Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Tue, 1 Sep 2026 22:26:12 +0200
Subject: fusefronted: fix mkdir log message on empty gocryptfs.diriv

Before:

$ mkdir asd
mkdir: cannot create directory ‘asd’: Operation not supported

Sep 01 22:24:15 brikett gocryptfs[185344]: go-fuse: can't convert error type: wanted 16 bytes, got 0

After:

$ mkdir asdasd
mkdir: cannot create directory ‘asdasd’: Input/output error

Sep 01 22:25:00 brikett gocryptfs[185784]: prepareAtSyscall: could not read gocryptfs.diriv: wanted 16 bytes, got 0

https://github.com/rfjakob/gocryptfs/issues/1033
---
 internal/fusefrontend/node_prepare_syscall.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/internal/fusefrontend/node_prepare_syscall.go b/internal/fusefrontend/node_prepare_syscall.go
index 9021350..03194df 100644
--- a/internal/fusefrontend/node_prepare_syscall.go
+++ b/internal/fusefrontend/node_prepare_syscall.go
@@ -3,6 +3,7 @@ package fusefrontend
 import (
 	"syscall"
 
+	"github.com/rfjakob/gocryptfs/v2/internal/nametransform"
 	"github.com/rfjakob/gocryptfs/v2/internal/tlog"
 
 	"github.com/hanwen/go-fuse/v2/fs"
@@ -73,8 +74,9 @@ func (n *Node) prepareAtSyscall(child string) (dirfd int, cName string, errno sy
 		var err error
 		iv, err = rn.nameTransform.ReadDirIVAt(dirfd)
 		if err != nil {
+			tlog.Warn.Printf("prepareAtSyscall: could not read %s: %v", nametransform.DirIVFilename, err)
 			syscall.Close(dirfd)
-			return -1, "", fs.ToErrno(err)
+			return -1, "", syscall.EIO
 		}
 	}
 	rn.dirCache.Store(n, dirfd, iv)
-- 
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