jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 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/PrivateInodeVMObject.h>
9
10namespace Kernel::Memory {
11
12ErrorOr<NonnullLockRefPtr<PrivateInodeVMObject>> PrivateInodeVMObject::try_create_with_inode(Inode& inode)
13{
14 if (inode.size() == 0)
15 return EINVAL;
16 return try_create_with_inode_and_range(inode, 0, inode.size());
17}
18
19ErrorOr<NonnullLockRefPtr<PrivateInodeVMObject>> PrivateInodeVMObject::try_create_with_inode_and_range(Inode& inode, u64 offset, size_t range_size)
20{
21 // Note: To ensure further allocation of a Region with this VMObject will not complain
22 // on "smaller" VMObject than the requested Region, we simply take the max size between both values.
23 auto size = max(inode.size(), (offset + range_size));
24 VERIFY(size > 0);
25 auto new_physical_pages = TRY(VMObject::try_create_physical_pages(size));
26 auto dirty_pages = TRY(Bitmap::create(new_physical_pages.size(), false));
27 return adopt_nonnull_lock_ref_or_enomem(new (nothrow) PrivateInodeVMObject(inode, move(new_physical_pages), move(dirty_pages)));
28}
29
30ErrorOr<NonnullLockRefPtr<VMObject>> PrivateInodeVMObject::try_clone()
31{
32 auto new_physical_pages = TRY(this->try_clone_physical_pages());
33 auto dirty_pages = TRY(Bitmap::create(new_physical_pages.size(), false));
34 return adopt_nonnull_lock_ref_or_enomem<VMObject>(new (nothrow) PrivateInodeVMObject(*this, move(new_physical_pages), move(dirty_pages)));
35}
36
37PrivateInodeVMObject::PrivateInodeVMObject(Inode& inode, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, Bitmap dirty_pages)
38 : InodeVMObject(inode, move(new_physical_pages), move(dirty_pages))
39{
40}
41
42PrivateInodeVMObject::PrivateInodeVMObject(PrivateInodeVMObject const& other, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, Bitmap dirty_pages)
43 : InodeVMObject(other, move(new_physical_pages), move(dirty_pages))
44{
45}
46
47PrivateInodeVMObject::~PrivateInodeVMObject() = default;
48
49}