From 8fa24045b1501e310fada3f0468f976cd66004ef Mon Sep 17 00:00:00 2001
From: "Unknown W. Brackets" <checkins@unknownbrackets.org>
Date: Sat, 15 Oct 2022 20:55:26 -0700
Subject: [PATCH] Io: Fail open earlier from ms0: w/ no access flags.

The PSP returns this error code if you use 0 for the open flags on ms0:/.
---
 Core/FileSystems/DirectoryFileSystem.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Core/FileSystems/DirectoryFileSystem.cpp b/Core/FileSystems/DirectoryFileSystem.cpp
index af8ea370a4..b2ae2fabb7 100644
--- a/Core/FileSystems/DirectoryFileSystem.cpp
+++ b/Core/FileSystems/DirectoryFileSystem.cpp
@@ -115,6 +115,11 @@ Path DirectoryFileSystem::GetLocalPath(std::string internalPath) const {
 bool DirectoryFileHandle::Open(const Path &basePath, std::string &fileName, FileAccess access, u32 &error) {
 	error = 0;
 
+	if (access == FILEACCESS_NONE) {
+		error = SCE_KERNEL_ERROR_ERRNO_INVALID_ARGUMENT;
+		return false;
+	}
+
 #if HOST_IS_CASE_SENSITIVE
 	if (access & (FILEACCESS_APPEND | FILEACCESS_CREATE | FILEACCESS_WRITE)) {
 		DEBUG_LOG(FILESYS, "Checking case for path %s", fileName.c_str());