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082ed6f417
This patch greatly simplifies VMObject locking by doing two things: 1. Giving VMObject an IntrusiveList of all its mapping Region objects. 2. Removing VMObject::m_paging_lock in favor of VMObject::m_lock Before (1), VMObject::for_each_region() was forced to acquire the global MM lock (since it worked by walking MemoryManager's list of all regions and checking for regions that pointed to itself.) With each VMObject having its own list of Regions, VMObject's own m_lock is all we need. Before (2), page fault handlers used a separate mutex for preventing overlapping work. This design required multiple temporary unlocks and was generally extremely hard to reason about. Instead, page fault handlers now use VMObject's own m_lock as well.
93 lines
2.0 KiB
C++
93 lines
2.0 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/VM/InodeVMObject.h>
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namespace Kernel {
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InodeVMObject::InodeVMObject(Inode& inode, size_t size)
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: VMObject(size)
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, m_inode(inode)
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, m_dirty_pages(page_count(), false)
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{
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}
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InodeVMObject::InodeVMObject(InodeVMObject const& other)
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: VMObject(other)
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, m_inode(other.m_inode)
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, m_dirty_pages(page_count(), false)
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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()
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{
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}
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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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ScopedSpinLock 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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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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u32 InodeVMObject::executable_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_executable())
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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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