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Kernel: Make AddressSpace::add_region() return KResultOr<Region*>

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This allows us to use TRY() in a few places.
This commit is contained in:
Andreas Kling 2021-09-06 02:02:06 +02:00
parent 062cc804e7
commit a994f11f10
3 changed files with 9 additions and 20 deletions
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20
Kernel/Memory/AddressSpace.cpp
View file

@ -144,9 +144,7 @@ KResultOr<Region*> AddressSpace::try_allocate_split_region(Region const& source_
{ {
auto new_region = TRY(Region::try_create_user_accessible( auto new_region = TRY(Region::try_create_user_accessible(
range, source_region.vmobject(), offset_in_vmobject, KString::try_create(source_region.name()), source_region.access(), source_region.is_cacheable() ? Region::Cacheable::Yes : Region::Cacheable::No, source_region.is_shared())); range, source_region.vmobject(), offset_in_vmobject, KString::try_create(source_region.name()), source_region.access(), source_region.is_cacheable() ? Region::Cacheable::Yes : Region::Cacheable::No, source_region.is_shared()));
auto* region = add_region(move(new_region)); auto* region = TRY(add_region(move(new_region)));
if (!region)
return ENOMEM;
region->set_syscall_region(source_region.is_syscall_region()); region->set_syscall_region(source_region.is_syscall_region());
region->set_mmap(source_region.is_mmap()); region->set_mmap(source_region.is_mmap());
region->set_stack(source_region.is_stack()); region->set_stack(source_region.is_stack());
@ -165,10 +163,7 @@ KResultOr<Region*> AddressSpace::allocate_region(VirtualRange const& range, Stri
auto region = TRY(Region::try_create_user_accessible(range, move(vmobject), 0, KString::try_create(name), prot_to_region_access_flags(prot), Region::Cacheable::Yes, false)); auto region = TRY(Region::try_create_user_accessible(range, move(vmobject), 0, KString::try_create(name), prot_to_region_access_flags(prot), Region::Cacheable::Yes, false));
if (!region->map(page_directory())) if (!region->map(page_directory()))
return ENOMEM; return ENOMEM;
auto* added_region = add_region(move(region)); return add_region(move(region));
if (!added_region)
return ENOMEM;
return added_region;
} }
KResultOr<Region*> AddressSpace::allocate_region_with_vmobject(VirtualRange const& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, StringView name, int prot, bool shared) KResultOr<Region*> AddressSpace::allocate_region_with_vmobject(VirtualRange const& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, StringView name, int prot, bool shared)
@ -189,9 +184,7 @@ KResultOr<Region*> AddressSpace::allocate_region_with_vmobject(VirtualRange cons
} }
offset_in_vmobject &= PAGE_MASK; offset_in_vmobject &= PAGE_MASK;
auto region = TRY(Region::try_create_user_accessible(range, move(vmobject), offset_in_vmobject, KString::try_create(name), prot_to_region_access_flags(prot), Region::Cacheable::Yes, shared)); auto region = TRY(Region::try_create_user_accessible(range, move(vmobject), offset_in_vmobject, KString::try_create(name), prot_to_region_access_flags(prot), Region::Cacheable::Yes, shared));
auto* added_region = add_region(move(region)); auto* added_region = TRY(add_region(move(region)));
if (!added_region)
return ENOMEM;
if (!added_region->map(page_directory())) if (!added_region->map(page_directory()))
return ENOMEM; return ENOMEM;
return added_region; return added_region;
@ -264,12 +257,13 @@ Vector<Region*> AddressSpace::find_regions_intersecting(VirtualRange const& rang
return regions; return regions;
} }
Region* AddressSpace::add_region(NonnullOwnPtr<Region> region) KResultOr<Region*> AddressSpace::add_region(NonnullOwnPtr<Region> region)
{ {
auto* ptr = region.ptr(); auto* ptr = region.ptr();
SpinlockLocker lock(m_lock); SpinlockLocker lock(m_lock);
auto success = m_regions.try_insert(region->vaddr().get(), move(region)); if (!m_regions.try_insert(region->vaddr().get(), move(region)))
return success ? ptr : nullptr; return ENOMEM;
return ptr;
} }
// Carve out a virtual address range from a region and return the two regions on either side // Carve out a virtual address range from a region and return the two regions on either side

2
Kernel/Memory/AddressSpace.h
View file

@ -24,7 +24,7 @@ public:
PageDirectory& page_directory() { return *m_page_directory; } PageDirectory& page_directory() { return *m_page_directory; }
const PageDirectory& page_directory() const { return *m_page_directory; } const PageDirectory& page_directory() const { return *m_page_directory; }
Region* add_region(NonnullOwnPtr<Region>); KResultOr<Region*> add_region(NonnullOwnPtr<Region>);
size_t region_count() const { return m_regions.size(); } size_t region_count() const { return m_regions.size(); }

7
Kernel/Syscalls/fork.cpp
View file

@ -94,12 +94,7 @@ KResultOr<FlatPtr> Process::sys$fork(RegisterState& regs)
for (auto& region : address_space().regions()) { for (auto& region : address_space().regions()) {
dbgln_if(FORK_DEBUG, "fork: cloning Region({}) '{}' @ {}", region, region->name(), region->vaddr()); dbgln_if(FORK_DEBUG, "fork: cloning Region({}) '{}' @ {}", region, region->name(), region->vaddr());
auto region_clone = TRY(region->try_clone()); auto region_clone = TRY(region->try_clone());
auto* child_region = child->address_space().add_region(move(region_clone)); auto* child_region = TRY(child->address_space().add_region(move(region_clone)));
if (!child_region) {
dbgln("fork: Cannot add region, insufficient memory");
// TODO: tear down new process?
return ENOMEM;
}
if (!child_region->map(child->address_space().page_directory(), Memory::ShouldFlushTLB::No)) if (!child_region->map(child->address_space().page_directory(), Memory::ShouldFlushTLB::No))
return ENOMEM; return ENOMEM;