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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <AK/Bitmap.h>
30#include <Kernel/UnixTypes.h>
31#include <Kernel/VM/VMObject.h>
32
33namespace Kernel {
34
35class InodeVMObject final : public VMObject {
36public:
37 virtual ~InodeVMObject() override;
38
39 static NonnullRefPtr<InodeVMObject> create_with_inode(Inode&);
40 virtual NonnullRefPtr<VMObject> clone() override;
41
42 Inode& inode() { return *m_inode; }
43 const Inode& inode() const { return *m_inode; }
44
45 void inode_contents_changed(Badge<Inode>, off_t, ssize_t, const u8*);
46 void inode_size_changed(Badge<Inode>, size_t old_size, size_t new_size);
47
48 size_t amount_dirty() const;
49 size_t amount_clean() const;
50
51 int release_all_clean_pages();
52
53 u32 writable_mappings() const;
54 u32 executable_mappings() const;
55
56private:
57 explicit InodeVMObject(Inode&, size_t);
58 explicit InodeVMObject(const InodeVMObject&);
59
60 InodeVMObject& operator=(const InodeVMObject&) = delete;
61 InodeVMObject& operator=(InodeVMObject&&) = delete;
62 InodeVMObject(InodeVMObject&&) = delete;
63
64 virtual bool is_inode() const override { return true; }
65
66 int release_all_clean_pages_impl();
67
68 NonnullRefPtr<Inode> m_inode;
69 Bitmap m_dirty_pages;
70};
71
72}