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2c72d495a3
I believe this to be safe, as the main thing that LockRefPtr provides over RefPtr is safe copying from a shared LockRefPtr instance. I've inspected the uses of RefPtr<PhysicalPage> and it seems they're all guarded by external locking. Some of it is less obvious, but this is an area where we're making continuous headway.
100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/Memory/InodeVMObject.h>
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namespace Kernel::Memory {
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InodeVMObject::InodeVMObject(Inode& inode, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, Bitmap dirty_pages)
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: VMObject(move(new_physical_pages))
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, m_inode(inode)
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, m_dirty_pages(move(dirty_pages))
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{
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}
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InodeVMObject::InodeVMObject(InodeVMObject const& other, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, Bitmap dirty_pages)
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: VMObject(move(new_physical_pages))
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, m_inode(other.m_inode)
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, m_dirty_pages(move(dirty_pages))
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{
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for (size_t i = 0; i < page_count(); ++i)
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m_dirty_pages.set(i, other.m_dirty_pages.get(i));
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}
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InodeVMObject::~InodeVMObject() = default;
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size_t InodeVMObject::amount_clean() const
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{
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size_t count = 0;
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VERIFY(page_count() == m_dirty_pages.size());
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for (size_t i = 0; i < page_count(); ++i) {
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if (!m_dirty_pages.get(i) && m_physical_pages[i])
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++count;
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}
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return count * PAGE_SIZE;
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}
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size_t InodeVMObject::amount_dirty() const
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{
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size_t count = 0;
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for (size_t i = 0; i < m_dirty_pages.size(); ++i) {
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if (m_dirty_pages.get(i))
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++count;
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}
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return count * PAGE_SIZE;
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}
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int InodeVMObject::release_all_clean_pages()
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{
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SpinlockLocker locker(m_lock);
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int count = 0;
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for (size_t i = 0; i < page_count(); ++i) {
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if (!m_dirty_pages.get(i) && m_physical_pages[i]) {
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m_physical_pages[i] = nullptr;
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++count;
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}
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}
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if (count) {
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for_each_region([](auto& region) {
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region.remap();
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});
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}
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return count;
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}
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int InodeVMObject::try_release_clean_pages(int page_amount)
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{
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SpinlockLocker locker(m_lock);
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int count = 0;
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for (size_t i = 0; i < page_count() && count < page_amount; ++i) {
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if (!m_dirty_pages.get(i) && m_physical_pages[i]) {
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m_physical_pages[i] = nullptr;
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++count;
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}
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}
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if (count) {
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for_each_region([](auto& region) {
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region.remap();
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});
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}
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return count;
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}
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u32 InodeVMObject::writable_mappings() const
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{
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u32 count = 0;
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const_cast<InodeVMObject&>(*this).for_each_region([&](auto& region) {
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if (region.is_writable())
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++count;
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});
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return count;
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}
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}
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