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Kernel: Make AnonymousVMObject physical page APIs OOM safe

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AnonymousVMObject::create_with_physical_page(s) can't be NonnullRefPtr
as it allocates internally. Fixing the API then surfaced an issue in
ScatterGatherList, where the code was attempting to create an
AnonymousVMObject in the constructor which will not be observable
during OOM.

Fix all of these issues and start propagating errors at the callers
of the AnonymousVMObject and ScatterGatherList APis.
This commit is contained in:
Brian Gianforcaro 2021-05-14 05:06:29 -07:00 • committed by Andreas Kling
parent d45db06826
commit a324d4d6a3
6 changed files with 20 additions and 13 deletions
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4
Kernel/VM/AnonymousVMObject.h
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@ -22,8 +22,8 @@ public:
static RefPtr<AnonymousVMObject> create_with_size(size_t, AllocationStrategy);
static RefPtr<AnonymousVMObject> create_for_physical_range(PhysicalAddress paddr, size_t size);
static NonnullRefPtr<AnonymousVMObject> create_with_physical_page(PhysicalPage& page);
static NonnullRefPtr<AnonymousVMObject> create_with_physical_pages(NonnullRefPtrVector<PhysicalPage>);
static RefPtr<AnonymousVMObject> create_with_physical_page(PhysicalPage& page);
static RefPtr<AnonymousVMObject> create_with_physical_pages(NonnullRefPtrVector<PhysicalPage>);
virtual RefPtr<VMObject> clone() override;
RefPtr<PhysicalPage> allocate_committed_page(size_t);