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Kernel: Stop using *LockRefPtr for Process pointers

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The only persistent one of these was Thread::m_process and that never
changes after initialization. Make it const to enforce this and switch
everything over to RefPtr & NonnullRefPtr.
This commit is contained in:
Andreas Kling 2023-04-02 18:35:32 +02:00
parent 19084ef743
commit 65438d8a85
Notes: sideshowbarker 2024-07-17 05:58:46 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/65438d8a85
Pull-request: https://github.com/SerenityOS/serenity/pull/18163
Reviewed-by: https://github.com/Hendiadyoin1
11 changed files with 42 additions and 42 deletions
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4
Kernel/Coredump.cpp
View File

@ -52,7 +52,7 @@ bool Coredump::FlatRegionData::is_consistent_with_region(Memory::Region const& r
return true;
}
ErrorOr<NonnullOwnPtr<Coredump>> Coredump::try_create(NonnullLockRefPtr<Process> process, StringView output_path)
ErrorOr<NonnullOwnPtr<Coredump>> Coredump::try_create(NonnullRefPtr<Process> process, StringView output_path)
{
if (!process->is_dumpable()) {
dbgln("Refusing to generate coredump for non-dumpable process {}", process->pid().value());
@ -74,7 +74,7 @@ ErrorOr<NonnullOwnPtr<Coredump>> Coredump::try_create(NonnullLockRefPtr<Process>
return adopt_nonnull_own_or_enomem(new (nothrow) Coredump(move(process), move(description), move(regions)));
}
Coredump::Coredump(NonnullLockRefPtr<Process> process, NonnullRefPtr<OpenFileDescription> description, Vector<FlatRegionData> regions)
Coredump::Coredump(NonnullRefPtr<Process> process, NonnullRefPtr<OpenFileDescription> description, Vector<FlatRegionData> regions)
: m_process(move(process))
, m_description(move(description))
, m_regions(move(regions))

6
Kernel/Coredump.h
View File

@ -18,7 +18,7 @@ namespace Kernel {
class Coredump {
public:
static ErrorOr<NonnullOwnPtr<Coredump>> try_create(NonnullLockRefPtr<Process>, StringView output_path);
static ErrorOr<NonnullOwnPtr<Coredump>> try_create(NonnullRefPtr<Process>, StringView output_path);
static SpinlockProtected<OwnPtr<KString>, LockRank::None>& directory_path();
~Coredump() = default;
@ -65,7 +65,7 @@ private:
VirtualAddress m_vaddr;
};
Coredump(NonnullLockRefPtr<Process>, NonnullRefPtr<OpenFileDescription>, Vector<FlatRegionData>);
Coredump(NonnullRefPtr<Process>, NonnullRefPtr<OpenFileDescription>, Vector<FlatRegionData>);
static ErrorOr<NonnullRefPtr<OpenFileDescription>> try_create_target_file(Process const&, StringView output_path);
ErrorOr<void> write_elf_header();
@ -79,7 +79,7 @@ private:
ErrorOr<void> create_notes_regions_data(auto&) const;
ErrorOr<void> create_notes_metadata_data(auto&) const;
NonnullLockRefPtr<Process> m_process;
NonnullRefPtr<Process> const m_process;
NonnullRefPtr<OpenFileDescription> m_description;
size_t m_num_program_headers { 0 };
Vector<FlatRegionData> m_regions;

2
Kernel/Devices/AsyncDeviceRequest.h
View File

@ -149,7 +149,7 @@ private:
AsyncDeviceSubRequestList m_sub_requests_pending;
AsyncDeviceSubRequestList m_sub_requests_complete;
WaitQueue m_queue;
NonnullLockRefPtr<Process> m_process;
NonnullRefPtr<Process> const m_process;
void* m_private { nullptr };
mutable Spinlock<LockRank::None> m_lock {};
};

2
Kernel/FileSystem/ProcFS/Inode.cpp
View File

@ -288,7 +288,7 @@ static ErrorOr<void> build_from_cached_data(KBufferBuilder& builder, ProcFSInode
return {};
}
ErrorOr<void> ProcFSInode::try_fetch_process_property_data(NonnullLockRefPtr<Process> process, KBufferBuilder& builder) const
ErrorOr<void> ProcFSInode::try_fetch_process_property_data(NonnullRefPtr<Process> process, KBufferBuilder& builder) const
{
VERIFY(m_type == Type::ProcessProperty);
if (m_subdirectory == process_fd_subdirectory_root_entry.subdirectory) {

2
Kernel/FileSystem/ProcFS/Inode.h
View File

@ -69,7 +69,7 @@ private:
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override final;
ErrorOr<void> refresh_process_property_data(OpenFileDescription& description);
ErrorOr<void> try_fetch_process_property_data(NonnullLockRefPtr<Process>, KBufferBuilder& builder) const;
ErrorOr<void> try_fetch_process_property_data(NonnullRefPtr<Process>, KBufferBuilder& builder) const;
Type m_type;
Optional<ProcessID> const m_associated_pid {};

24
Kernel/Process.cpp
View File

@ -202,13 +202,13 @@ void Process::kill_all_threads()
void Process::register_new(Process& process)
{
// Note: this is essentially the same like process->ref()
LockRefPtr<Process> new_process = process;
NonnullRefPtr<Process> const new_process = process;
all_instances().with([&](auto& list) {
list.prepend(process);
});
}
ErrorOr<NonnullLockRefPtr<Process>> Process::try_create_user_process(LockRefPtr<Thread>& first_thread, StringView path, UserID uid, GroupID gid, Vector<NonnullOwnPtr<KString>> arguments, Vector<NonnullOwnPtr<KString>> environment, TTY* tty)
ErrorOr<NonnullRefPtr<Process>> Process::try_create_user_process(LockRefPtr<Thread>& first_thread, StringView path, UserID uid, GroupID gid, Vector<NonnullOwnPtr<KString>> arguments, Vector<NonnullOwnPtr<KString>> environment, TTY* tty)
{
auto parts = path.split_view('/');
if (arguments.is_empty()) {
@ -257,7 +257,7 @@ ErrorOr<NonnullLockRefPtr<Process>> Process::try_create_user_process(LockRefPtr<
return process;
}
LockRefPtr<Process> Process::create_kernel_process(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, void (*entry)(void*), void* entry_data, u32 affinity, RegisterProcess do_register)
RefPtr<Process> Process::create_kernel_process(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, void (*entry)(void*), void* entry_data, u32 affinity, RegisterProcess do_register)
{
auto process_or_error = Process::try_create(first_thread, move(name), UserID(0), GroupID(0), ProcessID(0), true);
if (process_or_error.is_error())
@ -289,7 +289,7 @@ void Process::unprotect_data()
});
}
ErrorOr<NonnullLockRefPtr<Process>> Process::try_create(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, UserID uid, GroupID gid, ProcessID ppid, bool is_kernel_process, RefPtr<Custody> current_directory, RefPtr<Custody> executable, TTY* tty, Process* fork_parent)
ErrorOr<NonnullRefPtr<Process>> Process::try_create(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, UserID uid, GroupID gid, ProcessID ppid, bool is_kernel_process, RefPtr<Custody> current_directory, RefPtr<Custody> executable, TTY* tty, Process* fork_parent)
{
OwnPtr<Memory::AddressSpace> new_address_space;
if (fork_parent) {
@ -303,7 +303,7 @@ ErrorOr<NonnullLockRefPtr<Process>> Process::try_create(LockRefPtr<Thread>& firs
auto unveil_tree = UnveilNode { TRY(KString::try_create("/"sv)), UnveilMetadata(TRY(KString::try_create("/"sv))) };
auto exec_unveil_tree = UnveilNode { TRY(KString::try_create("/"sv)), UnveilMetadata(TRY(KString::try_create("/"sv))) };
auto credentials = TRY(Credentials::create(uid, gid, uid, gid, uid, gid, {}, fork_parent ? fork_parent->sid() : 0, fork_parent ? fork_parent->pgid() : 0));
auto process = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Process(move(name), move(credentials), ppid, is_kernel_process, move(current_directory), move(executable), tty, move(unveil_tree), move(exec_unveil_tree))));
auto process = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) Process(move(name), move(credentials), ppid, is_kernel_process, move(current_directory), move(executable), tty, move(unveil_tree), move(exec_unveil_tree))));
TRY(process->attach_resources(new_address_space.release_nonnull(), first_thread, fork_parent));
return process;
}
@ -491,11 +491,11 @@ void Process::crash(int signal, Optional<RegisterState const&> regs, bool out_of
VERIFY_NOT_REACHED();
}
LockRefPtr<Process> Process::from_pid_in_same_jail(ProcessID pid)
RefPtr<Process> Process::from_pid_in_same_jail(ProcessID pid)
{
return Process::current().m_jail_process_list.with([&](auto const& list_ptr) -> LockRefPtr<Process> {
return Process::current().m_jail_process_list.with([&](auto const& list_ptr) -> RefPtr<Process> {
if (list_ptr) {
return list_ptr->attached_processes().with([&](auto const& list) -> LockRefPtr<Process> {
return list_ptr->attached_processes().with([&](auto const& list) -> RefPtr<Process> {
for (auto& process : list) {
if (process.pid() == pid) {
return process;
@ -504,7 +504,7 @@ LockRefPtr<Process> Process::from_pid_in_same_jail(ProcessID pid)
return {};
});
}
return all_instances().with([&](auto const& list) -> LockRefPtr<Process> {
return all_instances().with([&](auto const& list) -> RefPtr<Process> {
for (auto& process : list) {
if (process.pid() == pid) {
return process;
@ -515,9 +515,9 @@ LockRefPtr<Process> Process::from_pid_in_same_jail(ProcessID pid)
});
}
LockRefPtr<Process> Process::from_pid_ignoring_jails(ProcessID pid)
RefPtr<Process> Process::from_pid_ignoring_jails(ProcessID pid)
{
return all_instances().with([&](auto const& list) -> LockRefPtr<Process> {
return all_instances().with([&](auto const& list) -> RefPtr<Process> {
for (auto const& process : list) {
if (process.pid() == pid)
return &process;
@ -812,7 +812,7 @@ void Process::disowned_by_waiter(Process& process)
void Process::unblock_waiters(Thread::WaitBlocker::UnblockFlags flags, u8 signal)
{
LockRefPtr<Process> waiter_process;
RefPtr<Process> waiter_process;
if (auto* my_tracer = tracer())
waiter_process = Process::from_pid_ignoring_jails(my_tracer->tracer_pid());
else

14
Kernel/Process.h
View File

@ -186,14 +186,14 @@ public:
};
template<typename EntryFunction>
static LockRefPtr<Process> create_kernel_process(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, EntryFunction entry, u32 affinity = THREAD_AFFINITY_DEFAULT, RegisterProcess do_register = RegisterProcess::Yes)
static RefPtr<Process> create_kernel_process(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, EntryFunction entry, u32 affinity = THREAD_AFFINITY_DEFAULT, RegisterProcess do_register = RegisterProcess::Yes)
{
auto* entry_func = new EntryFunction(move(entry));
return create_kernel_process(first_thread, move(name), &Process::kernel_process_trampoline<EntryFunction>, entry_func, affinity, do_register);
}
static LockRefPtr<Process> create_kernel_process(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, void (*entry)(void*), void* entry_data = nullptr, u32 affinity = THREAD_AFFINITY_DEFAULT, RegisterProcess do_register = RegisterProcess::Yes);
static ErrorOr<NonnullLockRefPtr<Process>> try_create_user_process(LockRefPtr<Thread>& first_thread, StringView path, UserID, GroupID, Vector<NonnullOwnPtr<KString>> arguments, Vector<NonnullOwnPtr<KString>> environment, TTY*);
static RefPtr<Process> create_kernel_process(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, void (*entry)(void*), void* entry_data = nullptr, u32 affinity = THREAD_AFFINITY_DEFAULT, RegisterProcess do_register = RegisterProcess::Yes);
static ErrorOr<NonnullRefPtr<Process>> try_create_user_process(LockRefPtr<Thread>& first_thread, StringView path, UserID, GroupID, Vector<NonnullOwnPtr<KString>> arguments, Vector<NonnullOwnPtr<KString>> environment, TTY*);
static void register_new(Process&);
~Process();
@ -215,8 +215,8 @@ public:
bool is_kernel_process() const { return m_is_kernel_process; }
bool is_user_process() const { return !m_is_kernel_process; }
static LockRefPtr<Process> from_pid_in_same_jail(ProcessID);
static LockRefPtr<Process> from_pid_ignoring_jails(ProcessID);
static RefPtr<Process> from_pid_in_same_jail(ProcessID);
static RefPtr<Process> from_pid_ignoring_jails(ProcessID);
static SessionID get_sid_from_pgid(ProcessGroupID pgid);
SpinlockProtected<NonnullOwnPtr<KString>, LockRank::None> const& name() const;
@ -594,7 +594,7 @@ private:
bool remove_thread(Thread&);
Process(NonnullOwnPtr<KString> name, NonnullRefPtr<Credentials>, ProcessID ppid, bool is_kernel_process, RefPtr<Custody> current_directory, RefPtr<Custody> executable, TTY* tty, UnveilNode unveil_tree, UnveilNode exec_unveil_tree);
static ErrorOr<NonnullLockRefPtr<Process>> try_create(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, UserID, GroupID, ProcessID ppid, bool is_kernel_process, RefPtr<Custody> current_directory = nullptr, RefPtr<Custody> executable = nullptr, TTY* = nullptr, Process* fork_parent = nullptr);
static ErrorOr<NonnullRefPtr<Process>> try_create(LockRefPtr<Thread>& first_thread, NonnullOwnPtr<KString> name, UserID, GroupID, ProcessID ppid, bool is_kernel_process, RefPtr<Custody> current_directory = nullptr, RefPtr<Custody> executable = nullptr, TTY* = nullptr, Process* fork_parent = nullptr);
ErrorOr<void> attach_resources(NonnullOwnPtr<Memory::AddressSpace>&&, LockRefPtr<Thread>& first_thread, Process* fork_parent);
static ProcessID allocate_pid();
@ -617,7 +617,7 @@ private:
ErrorOr<void> do_killall(int signal);
ErrorOr<void> do_killself(int signal);
ErrorOr<siginfo_t> do_waitid(Variant<Empty, NonnullLockRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee, int options);
ErrorOr<siginfo_t> do_waitid(Variant<Empty, NonnullRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee, int options);
static ErrorOr<NonnullOwnPtr<KString>> get_syscall_path_argument(Userspace<char const*> user_path, size_t path_length);
static ErrorOr<NonnullOwnPtr<KString>> get_syscall_path_argument(Syscall::StringArgument const&);

4
Kernel/Syscalls/waitid.cpp
View File

@ -10,7 +10,7 @@
namespace Kernel {
ErrorOr<siginfo_t> Process::do_waitid(Variant<Empty, NonnullLockRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee, int options)
ErrorOr<siginfo_t> Process::do_waitid(Variant<Empty, NonnullRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee, int options)
{
ErrorOr<siginfo_t> result = siginfo_t {};
if (Thread::current()->block<Thread::WaitBlocker>({}, options, move(waitee), result).was_interrupted())
@ -25,7 +25,7 @@ ErrorOr<FlatPtr> Process::sys$waitid(Userspace<Syscall::SC_waitid_params const*>
TRY(require_promise(Pledge::proc));
auto params = TRY(copy_typed_from_user(user_params));
Variant<Empty, NonnullLockRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee;
Variant<Empty, NonnullRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee;
switch (params.idtype) {
case P_ALL:
break;

6
Kernel/Thread.cpp
View File

@ -39,7 +39,7 @@ SpinlockProtected<Thread::GlobalList, LockRank::None>& Thread::all_instances()
return *s_list;
}
ErrorOr<NonnullLockRefPtr<Thread>> Thread::try_create(NonnullLockRefPtr<Process> process)
ErrorOr<NonnullLockRefPtr<Thread>> Thread::try_create(NonnullRefPtr<Process> process)
{
auto kernel_stack_region = TRY(MM.allocate_kernel_region(default_kernel_stack_size, {}, Memory::Region::Access::ReadWrite, AllocationStrategy::AllocateNow));
kernel_stack_region->set_stack(true);
@ -50,7 +50,7 @@ ErrorOr<NonnullLockRefPtr<Thread>> Thread::try_create(NonnullLockRefPtr<Process>
return adopt_nonnull_lock_ref_or_enomem(new (nothrow) Thread(move(process), move(kernel_stack_region), move(block_timer), move(name)));
}
Thread::Thread(NonnullLockRefPtr<Process> process, NonnullOwnPtr<Memory::Region> kernel_stack_region, NonnullLockRefPtr<Timer> block_timer, NonnullOwnPtr<KString> name)
Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Memory::Region> kernel_stack_region, NonnullLockRefPtr<Timer> block_timer, NonnullOwnPtr<KString> name)
: m_process(move(process))
, m_kernel_stack_region(move(kernel_stack_region))
, m_name(move(name))
@ -596,7 +596,7 @@ void Thread::finalize_dying_threads()
});
}
for (auto* thread : dying_threads) {
LockRefPtr<Process> process = thread->process();
RefPtr<Process> const process = thread->process();
dbgln_if(PROCESS_DEBUG, "Before finalization, {} has {} refs and its process has {}",
*thread, thread->ref_count(), thread->process().ref_count());
thread->finalize();

14
Kernel/Thread.h
View File

@ -67,7 +67,7 @@ public:
return Processor::current_thread();
}
static ErrorOr<NonnullLockRefPtr<Thread>> try_create(NonnullLockRefPtr<Process>);
static ErrorOr<NonnullLockRefPtr<Thread>> try_create(NonnullRefPtr<Process>);
~Thread();
static LockRefPtr<Thread> from_tid(ThreadID);
@ -644,7 +644,7 @@ public:
Disowned
};
WaitBlocker(int wait_options, Variant<Empty, NonnullLockRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee, ErrorOr<siginfo_t>& result);
WaitBlocker(int wait_options, Variant<Empty, NonnullRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee, ErrorOr<siginfo_t>& result);
virtual StringView state_string() const override { return "Waiting"sv; }
virtual Type blocker_type() const override { return Type::Wait; }
virtual void will_unblock_immediately_without_blocking(UnblockImmediatelyReason) override;
@ -660,7 +660,7 @@ public:
int const m_wait_options;
ErrorOr<siginfo_t>& m_result;
Variant<Empty, NonnullLockRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> m_waitee;
Variant<Empty, NonnullRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> const m_waitee;
bool m_did_unblock { false };
bool m_got_sigchild { false };
};
@ -684,12 +684,12 @@ public:
private:
struct ProcessBlockInfo {
NonnullLockRefPtr<Process> process;
NonnullRefPtr<Process> const process;
WaitBlocker::UnblockFlags flags;
u8 signal;
bool was_waited { false };
explicit ProcessBlockInfo(NonnullLockRefPtr<Process>&&, WaitBlocker::UnblockFlags, u8);
explicit ProcessBlockInfo(NonnullRefPtr<Process>&&, WaitBlocker::UnblockFlags, u8);
~ProcessBlockInfo();
};
@ -1083,7 +1083,7 @@ public:
#endif
private:
Thread(NonnullLockRefPtr<Process>, NonnullOwnPtr<Memory::Region>, NonnullLockRefPtr<Timer>, NonnullOwnPtr<KString>);
Thread(NonnullRefPtr<Process>, NonnullOwnPtr<Memory::Region>, NonnullLockRefPtr<Timer>, NonnullOwnPtr<KString>);
BlockResult block_impl(BlockTimeout const&, Blocker&);
@ -1154,7 +1154,7 @@ private:
mutable RecursiveSpinlock<LockRank::Thread> m_lock {};
mutable RecursiveSpinlock<LockRank::None> m_block_lock {};
NonnullLockRefPtr<Process> m_process;
NonnullRefPtr<Process> const m_process;
ThreadID m_tid { -1 };
ThreadRegisters m_regs {};
DebugRegisterState m_debug_register_state {};

6
Kernel/ThreadBlockers.cpp
View File

@ -510,7 +510,7 @@ bool Thread::SignalBlocker::check_pending_signals(bool from_add_blocker)
return true;
}
Thread::WaitBlockerSet::ProcessBlockInfo::ProcessBlockInfo(NonnullLockRefPtr<Process>&& process, WaitBlocker::UnblockFlags flags, u8 signal)
Thread::WaitBlockerSet::ProcessBlockInfo::ProcessBlockInfo(NonnullRefPtr<Process>&& process, WaitBlocker::UnblockFlags flags, u8 signal)
: process(move(process))
, flags(flags)
, signal(signal)
@ -663,7 +663,7 @@ void Thread::WaitBlockerSet::finalize()
}
}
Thread::WaitBlocker::WaitBlocker(int wait_options, Variant<Empty, NonnullLockRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee, ErrorOr<siginfo_t>& result)
Thread::WaitBlocker::WaitBlocker(int wait_options, Variant<Empty, NonnullRefPtr<Process>, NonnullLockRefPtr<ProcessGroup>> waitee, ErrorOr<siginfo_t>& result)
: m_wait_options(wait_options)
, m_result(result)
, m_waitee(move(waitee))
@ -731,7 +731,7 @@ bool Thread::WaitBlocker::unblock(Process& process, UnblockFlags flags, u8 signa
VERIFY(flags != UnblockFlags::Terminated || signal == 0); // signal argument should be ignored for Terminated
bool do_not_unblock = m_waitee.visit(
[&](NonnullLockRefPtr<Process> const& waitee_process) {
[&](NonnullRefPtr<Process> const& waitee_process) {
return &process != waitee_process;
},
[&](NonnullLockRefPtr<ProcessGroup> const& waitee_process_group) {