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Kernel: Use non-locking {Nonnull,}RefPtr for OpenFileDescription

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This patch switches away from {Nonnull,}LockRefPtr to the non-locking
smart pointers throughout the kernel.

I've looked at the handful of places where these were being persisted
and I don't see any race situations.

Note that the process file descriptor table (Process::m_fds) was already
guarded via MutexProtected.
This commit is contained in:
Andreas Kling 2023-03-06 19:29:25 +01:00
parent 36b0ecfe9e
commit d1371d66f7
34 changed files with 82 additions and 80 deletions
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2
Kernel/Syscalls/anon_create.cpp
View file

@ -38,7 +38,7 @@ ErrorOr<FlatPtr> Process::sys$anon_create(size_t size, int options)
return m_fds.with_exclusive([&](auto& fds) -> ErrorOr<FlatPtr> {
auto new_fd = TRY(fds.allocate());
fds[new_fd.fd].set(move(description), fd_flags);
fds[new_fd.fd].set(description, fd_flags);
return new_fd.fd;
});
}

10
Kernel/Syscalls/execve.cpp
View file

@ -423,8 +423,8 @@ static ErrorOr<LoadResult> load_elf_object(NonnullOwnPtr<Memory::AddressSpace> n
}
ErrorOr<LoadResult>
Process::load(NonnullLockRefPtr<OpenFileDescription> main_program_description,
LockRefPtr<OpenFileDescription> interpreter_description, const ElfW(Ehdr) & main_program_header)
Process::load(NonnullRefPtr<OpenFileDescription> main_program_description,
RefPtr<OpenFileDescription> interpreter_description, const ElfW(Ehdr) & main_program_header)
{
auto new_space = TRY(Memory::AddressSpace::try_create(nullptr));
@ -471,8 +471,8 @@ void Process::clear_signal_handlers_for_exec()
}
}
ErrorOr<void> Process::do_exec(NonnullLockRefPtr<OpenFileDescription> main_program_description, Vector<NonnullOwnPtr<KString>> arguments, Vector<NonnullOwnPtr<KString>> environment,
LockRefPtr<OpenFileDescription> interpreter_description, Thread*& new_main_thread, InterruptsState& previous_interrupts_state, const ElfW(Ehdr) & main_program_header)
ErrorOr<void> Process::do_exec(NonnullRefPtr<OpenFileDescription> main_program_description, Vector<NonnullOwnPtr<KString>> arguments, Vector<NonnullOwnPtr<KString>> environment,
RefPtr<OpenFileDescription> interpreter_description, Thread*& new_main_thread, InterruptsState& previous_interrupts_state, const ElfW(Ehdr) & main_program_header)
{
VERIFY(is_user_process());
VERIFY(!Processor::in_critical());
@ -784,7 +784,7 @@ static ErrorOr<Vector<NonnullOwnPtr<KString>>> find_shebang_interpreter_for_exec
return ENOEXEC;
}
ErrorOr<LockRefPtr<OpenFileDescription>> Process::find_elf_interpreter_for_executable(StringView path, ElfW(Ehdr) const& main_executable_header, size_t main_executable_header_size, size_t file_size)
ErrorOr<RefPtr<OpenFileDescription>> Process::find_elf_interpreter_for_executable(StringView path, ElfW(Ehdr) const& main_executable_header, size_t main_executable_header_size, size_t file_size)
{
// Not using ErrorOr here because we'll want to do the same thing in userspace in the RTLD
StringBuilder interpreter_path_builder;

2
Kernel/Syscalls/mmap.cpp
View file

@ -196,7 +196,7 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<Syscall::SC_mmap_params const*> use
Memory::Region* region = nullptr;
LockRefPtr<OpenFileDescription> description;
RefPtr<OpenFileDescription> description;
LockRefPtr<Memory::VMObject> vmobject;
u64 used_offset = 0;

2
Kernel/Syscalls/poll.cpp
View file

@ -51,7 +51,7 @@ ErrorOr<FlatPtr> Process::sys$poll(Userspace<Syscall::SC_poll_params const*> use
TRY(m_fds.with_shared([&](auto& fds) -> ErrorOr<void> {
for (size_t i = 0; i < params.nfds; i++) {
auto& pfd = fds_copy[i];
LockRefPtr<OpenFileDescription> description;
RefPtr<OpenFileDescription> description;
auto description_or_error = fds.open_file_description(pfd.fd);
if (!description_or_error.is_error())
description = description_or_error.release_value();

2
Kernel/Syscalls/read.cpp
View file

@ -13,7 +13,7 @@ namespace Kernel {
using BlockFlags = Thread::FileBlocker::BlockFlags;
static ErrorOr<NonnullLockRefPtr<OpenFileDescription>> open_readable_file_description(auto& fds, int fd)
static ErrorOr<NonnullRefPtr<OpenFileDescription>> open_readable_file_description(auto& fds, int fd)
{
auto description = TRY(fds.with_shared([&](auto& fds) { return fds.open_file_description(fd); }));
if (!description->is_readable())

4
Kernel/Syscalls/socket.cpp
View file

@ -20,7 +20,7 @@ namespace Kernel {
TRY(require_promise(Pledge::unix)); \
} while (0)
static void setup_socket_fd(Process::OpenFileDescriptions& fds, int fd, NonnullLockRefPtr<OpenFileDescription> description, int type)
static void setup_socket_fd(Process::OpenFileDescriptions& fds, int fd, NonnullRefPtr<OpenFileDescription> description, int type)
{
description->set_readable(true);
description->set_writable(true);
@ -94,7 +94,7 @@ ErrorOr<FlatPtr> Process::sys$accept4(Userspace<Syscall::SC_accept4_params const
TRY(copy_from_user(&address_size, static_ptr_cast<socklen_t const*>(user_address_size)));
ScopedDescriptionAllocation fd_allocation;
LockRefPtr<OpenFileDescription> accepting_socket_description;
RefPtr<OpenFileDescription> accepting_socket_description;
TRY(m_fds.with_exclusive([&](auto& fds) -> ErrorOr<void> {
fd_allocation = TRY(fds.allocate());

2
Kernel/Syscalls/utimensat.cpp
View file

@ -38,7 +38,7 @@ ErrorOr<FlatPtr> Process::sys$utimensat(Userspace<Syscall::SC_utimensat_params c
}
OwnPtr<KString> path;
LockRefPtr<OpenFileDescription> description;
RefPtr<OpenFileDescription> description;
RefPtr<Custody> base;
auto path_or_error = get_syscall_path_argument(params.path);