jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/FileSystem/Inode.h>
8#include <Kernel/Memory/InodeVMObject.h>
9
10namespace Kernel::Memory {
11
12InodeVMObject::InodeVMObject(Inode& inode, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, Bitmap dirty_pages)
13 : VMObject(move(new_physical_pages))
14 , m_inode(inode)
15 , m_dirty_pages(move(dirty_pages))
16{
17}
18
19InodeVMObject::InodeVMObject(InodeVMObject const& other, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, Bitmap dirty_pages)
20 : VMObject(move(new_physical_pages))
21 , m_inode(other.m_inode)
22 , m_dirty_pages(move(dirty_pages))
23{
24 for (size_t i = 0; i < page_count(); ++i)
25 m_dirty_pages.set(i, other.m_dirty_pages.get(i));
26}
27
28InodeVMObject::~InodeVMObject() = default;
29
30size_t InodeVMObject::amount_clean() const
31{
32 size_t count = 0;
33 VERIFY(page_count() == m_dirty_pages.size());
34 for (size_t i = 0; i < page_count(); ++i) {
35 if (!m_dirty_pages.get(i) && m_physical_pages[i])
36 ++count;
37 }
38 return count * PAGE_SIZE;
39}
40
41size_t InodeVMObject::amount_dirty() const
42{
43 size_t count = 0;
44 for (size_t i = 0; i < m_dirty_pages.size(); ++i) {
45 if (m_dirty_pages.get(i))
46 ++count;
47 }
48 return count * PAGE_SIZE;
49}
50
51int InodeVMObject::release_all_clean_pages()
52{
53 SpinlockLocker locker(m_lock);
54
55 int count = 0;
56 for (size_t i = 0; i < page_count(); ++i) {
57 if (!m_dirty_pages.get(i) && m_physical_pages[i]) {
58 m_physical_pages[i] = nullptr;
59 ++count;
60 }
61 }
62 if (count) {
63 for_each_region([](auto& region) {
64 region.remap();
65 });
66 }
67 return count;
68}
69
70int InodeVMObject::try_release_clean_pages(int page_amount)
71{
72 SpinlockLocker locker(m_lock);
73
74 int count = 0;
75 for (size_t i = 0; i < page_count() && count < page_amount; ++i) {
76 if (!m_dirty_pages.get(i) && m_physical_pages[i]) {
77 m_physical_pages[i] = nullptr;
78 ++count;
79 }
80 }
81 if (count) {
82 for_each_region([](auto& region) {
83 region.remap();
84 });
85 }
86 return count;
87}
88
89u32 InodeVMObject::writable_mappings() const
90{
91 u32 count = 0;
92 const_cast<InodeVMObject&>(*this).for_each_region([&](auto& region) {
93 if (region.is_writable())
94 ++count;
95 });
96 return count;
97}
98
99}