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Kernel: Handle committing pages in regions more gracefully

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Sometimes a physical underlying page may be there, but we may be
unable to allocate a page table that may be needed to map it. Bubble
up such mapping errors so that they can be handled more appropriately.
This commit is contained in:
Tom 2020-09-01 16:10:54 -06:00 • committed by Andreas Kling
parent 1ece93c805
commit bf268a0185
4 changed files with 58 additions and 31 deletions
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6
Kernel/VM/Region.h
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@ -171,7 +171,7 @@ public:
void set_executable(bool b) { set_access_bit(Access::Execute, b); }
void set_page_directory(PageDirectory&);
void map(PageDirectory&);
bool map(PageDirectory&);
enum class ShouldDeallocateVirtualMemoryRange {
No,
Yes,
@ -201,13 +201,13 @@ private:
}
bool commit(size_t page_index);
void remap_page(size_t index, bool with_flush = true);
bool remap_page(size_t index, bool with_flush = true);
PageFaultResponse handle_cow_fault(size_t page_index);
PageFaultResponse handle_inode_fault(size_t page_index);
PageFaultResponse handle_zero_fault(size_t page_index);
void map_individual_page_impl(size_t page_index);
bool map_individual_page_impl(size_t page_index);
RefPtr<PageDirectory> m_page_directory;
Range m_range;