Bananymous
9537922acc
Memory regions are now splitted when they get munmapped, mprotected, or mmapped with MAP_FIXED. This is used by couple of ports, and without this we were just leaking up memory or straight up crashing programs.
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
#pragma once
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#include <kernel/FS/Inode.h>
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#include <kernel/Memory/MemoryRegion.h>
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namespace Kernel
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{
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struct SharedFileData : public BAN::RefCounted<SharedFileData>, public BAN::Weakable<SharedFileData>
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{
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~SharedFileData();
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void sync(size_t page_index);
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Mutex mutex;
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// FIXME: this should probably be ordered tree like map
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// for fast lookup and less memory usage
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BAN::Vector<paddr_t> pages;
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BAN::RefPtr<Inode> inode;
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uint8_t page_buffer[PAGE_SIZE];
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};
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class FileBackedRegion final : public MemoryRegion
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{
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BAN_NON_COPYABLE(FileBackedRegion);
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BAN_NON_MOVABLE(FileBackedRegion);
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public:
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static BAN::ErrorOr<BAN::UniqPtr<FileBackedRegion>> create(BAN::RefPtr<Inode>, PageTable&, off_t offset, size_t size, AddressRange address_range, Type, PageTable::flags_t, int status_flags);
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~FileBackedRegion();
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BAN::ErrorOr<void> msync(vaddr_t, size_t, int) override;
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BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> clone(PageTable& new_page_table) override;
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BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> split(size_t offset) override;
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protected:
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BAN::ErrorOr<bool> allocate_page_containing_impl(vaddr_t vaddr, bool wants_write) override;
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private:
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FileBackedRegion(BAN::RefPtr<Inode>, PageTable&, off_t offset, ssize_t size, Type type, PageTable::flags_t flags, int status_flags);
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private:
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BAN::RefPtr<Inode> m_inode;
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const off_t m_offset;
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BAN::Vector<paddr_t> m_dirty_pages;
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BAN::RefPtr<SharedFileData> m_shared_data;
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};
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}
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