From 6354a9a0303af2f8ece388c72907bbeb89196723 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 7 Mar 2022 21:38:10 +0100
Subject: [PATCH] Kernel: Mark sys$fsync() as not needing the big lock

This syscall doesn't access any data that was implicitly protected by
the big lock.
---
 Kernel/API/Syscall.h      | 2 +-
 Kernel/Syscalls/fsync.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Kernel/API/Syscall.h b/Kernel/API/Syscall.h
index 2fb5c580cc..9ef87ca331 100644
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@@ -78,7 +78,7 @@ enum class NeedsBigProcessLock {
     S(fork, NeedsBigProcessLock::Yes)                       \
     S(fstat, NeedsBigProcessLock::No)                       \
     S(fstatvfs, NeedsBigProcessLock::Yes)                   \
-    S(fsync, NeedsBigProcessLock::Yes)                      \
+    S(fsync, NeedsBigProcessLock::No)                       \
     S(ftruncate, NeedsBigProcessLock::Yes)                  \
     S(futex, NeedsBigProcessLock::Yes)                      \
     S(get_dir_entries, NeedsBigProcessLock::Yes)            \
diff --git a/Kernel/Syscalls/fsync.cpp b/Kernel/Syscalls/fsync.cpp
index f726c4cfb6..89b91152fd 100644
--- a/Kernel/Syscalls/fsync.cpp
+++ b/Kernel/Syscalls/fsync.cpp
@@ -10,7 +10,7 @@ namespace Kernel {
 
 ErrorOr<FlatPtr> Process::sys$fsync(int fd)
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
+    VERIFY_NO_PROCESS_BIG_LOCK(this);
     TRY(require_promise(Pledge::stdio));
     auto description = TRY(open_file_description(fd));
     TRY(description->sync());