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Kernel: Use RefPtr instead of LockRefPtr for Custody

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By protecting all the RefPtr<Custody> objects that may be accessed from
multiple threads at the same time (with spinlocks), we remove the need
for using LockRefPtr<Custody> (which is basically a RefPtr with a
built-in spinlock.)
This commit is contained in:
Andreas Kling 2022-08-21 01:04:35 +02:00
parent 5331d243c6
commit 728c3fbd14
23 changed files with 143 additions and 102 deletions
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5
Kernel/Syscalls/chdir.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/RefPtr.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>
@ -15,10 +16,10 @@ ErrorOr<FlatPtr> Process::sys$chdir(Userspace<char const*> user_path, size_t pat
VERIFY_NO_PROCESS_BIG_LOCK(this);
TRY(require_promise(Pledge::rpath));
auto path = TRY(get_syscall_path_argument(user_path, path_length));
auto current_directory = m_current_directory.with([](auto& current_directory) -> NonnullLockRefPtr<Custody> {
auto current_directory = m_current_directory.with([](auto& current_directory) -> NonnullRefPtr<Custody> {
return *current_directory;
});
LockRefPtr<Custody> new_directory = TRY(VirtualFileSystem::the().open_directory(path->view(), *current_directory));
RefPtr<Custody> new_directory = TRY(VirtualFileSystem::the().open_directory(path->view(), *current_directory));
m_current_directory.with([&](auto& current_directory) {
// NOTE: We use swap() here to avoid manipulating the ref counts while holding the lock.
swap(current_directory, new_directory);