ladybird/Kernel/VM/InodeVMObject.cpp
2021-04-25 09:38:27 +02:00

97 lines
2.1 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/VM/InodeVMObject.h>
#include <Kernel/VM/MemoryManager.h>
namespace Kernel {
InodeVMObject::InodeVMObject(Inode& inode, size_t size)
: VMObject(size)
, m_inode(inode)
, m_dirty_pages(page_count(), false)
{
}
InodeVMObject::InodeVMObject(const InodeVMObject& other)
: VMObject(other)
, m_inode(other.m_inode)
, m_dirty_pages(page_count(), false)
{
for (size_t i = 0; i < page_count(); ++i)
m_dirty_pages.set(i, other.m_dirty_pages.get(i));
}
InodeVMObject::~InodeVMObject()
{
}
size_t InodeVMObject::amount_clean() const
{
size_t count = 0;
VERIFY(page_count() == m_dirty_pages.size());
for (size_t i = 0; i < page_count(); ++i) {
if (!m_dirty_pages.get(i) && m_physical_pages[i])
++count;
}
return count * PAGE_SIZE;
}
size_t InodeVMObject::amount_dirty() const
{
size_t count = 0;
for (size_t i = 0; i < m_dirty_pages.size(); ++i) {
if (m_dirty_pages.get(i))
++count;
}
return count * PAGE_SIZE;
}
int InodeVMObject::release_all_clean_pages()
{
Locker locker(m_paging_lock);
return release_all_clean_pages_impl();
}
int InodeVMObject::release_all_clean_pages_impl()
{
int count = 0;
InterruptDisabler disabler;
for (size_t i = 0; i < page_count(); ++i) {
if (!m_dirty_pages.get(i) && m_physical_pages[i]) {
m_physical_pages[i] = nullptr;
++count;
}
}
for_each_region([](auto& region) {
region.remap();
});
return count;
}
u32 InodeVMObject::writable_mappings() const
{
u32 count = 0;
const_cast<InodeVMObject&>(*this).for_each_region([&](auto& region) {
if (region.is_writable())
++count;
});
return count;
}
u32 InodeVMObject::executable_mappings() const
{
u32 count = 0;
const_cast<InodeVMObject&>(*this).for_each_region([&](auto& region) {
if (region.is_executable())
++count;
});
return count;
}
}