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Kernel: Store a pointer to the owner process in PageDirectory

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This replaces the previous owning address space pointer. This commit
should not change any of the existing functionality, but it lays down
the groundwork needed to let us properly access the region table under
the address space spinlock during page fault handling.
This commit is contained in:
Idan Horowitz 2023-04-04 21:06:14 +03:00
parent 65641187ff
commit 003989e1b0
9 changed files with 33 additions and 32 deletions
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20
Kernel/Process.cpp
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@ -286,20 +286,22 @@ void Process::unprotect_data()
ErrorOr<Process::ProcessAndFirstThread> Process::create(NonnullOwnPtr<KString> name, UserID uid, GroupID gid, ProcessID ppid, bool is_kernel_process, RefPtr<Custody> current_directory, RefPtr<Custody> executable, RefPtr<TTY> tty, Process* fork_parent)
{
OwnPtr<Memory::AddressSpace> new_address_space;
if (fork_parent) {
TRY(fork_parent->address_space().with([&](auto& parent_address_space) -> ErrorOr<void> {
new_address_space = TRY(Memory::AddressSpace::try_create(parent_address_space.ptr()));
return {};
}));
} else {
new_address_space = TRY(Memory::AddressSpace::try_create(nullptr));
}
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_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))));
OwnPtr<Memory::AddressSpace> new_address_space;
if (fork_parent) {
TRY(fork_parent->address_space().with([&](auto& parent_address_space) -> ErrorOr<void> {
new_address_space = TRY(Memory::AddressSpace::try_create(*process, parent_address_space.ptr()));
return {};
}));
} else {
new_address_space = TRY(Memory::AddressSpace::try_create(*process, nullptr));
}
auto first_thread = TRY(process->attach_resources(new_address_space.release_nonnull(), fork_parent));
return ProcessAndFirstThread { move(process), move(first_thread) };