mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-01-23 09:46:04 -05:00
2871df6f0d
As it turns out, Dr. POSIX doesn't require that post-mmap() changes to a file are reflected in the memory mappings. So we don't actually have to care about the file size changing (or the contents.) IIUC, as long as all the MAP_SHARED mappings that refer to the same inode are in sync, we're good. This means that VMObjects don't need resizing capabilities. I'm sure there are ways we can take advantage of this fact.
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Bitmap.h>
|
|
#include <Kernel/UnixTypes.h>
|
|
#include <Kernel/VM/VMObject.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class InodeVMObject : public VMObject {
|
|
public:
|
|
virtual ~InodeVMObject() override;
|
|
|
|
Inode& inode() { return *m_inode; }
|
|
const Inode& inode() const { return *m_inode; }
|
|
|
|
size_t amount_dirty() const;
|
|
size_t amount_clean() const;
|
|
|
|
int release_all_clean_pages();
|
|
|
|
u32 writable_mappings() const;
|
|
u32 executable_mappings() const;
|
|
|
|
protected:
|
|
explicit InodeVMObject(Inode&, size_t);
|
|
explicit InodeVMObject(const InodeVMObject&);
|
|
|
|
InodeVMObject& operator=(const InodeVMObject&) = delete;
|
|
InodeVMObject& operator=(InodeVMObject&&) = delete;
|
|
InodeVMObject(InodeVMObject&&) = delete;
|
|
|
|
virtual bool is_inode() const final { return true; }
|
|
|
|
int release_all_clean_pages_impl();
|
|
|
|
NonnullRefPtr<Inode> m_inode;
|
|
Bitmap m_dirty_pages;
|
|
};
|
|
|
|
}
|