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Kernel: Split the TmpFS core files into smaller components

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Liav A 2022-10-23 22:01:40 +03:00 • committed by Andrew Kaster
parent f53149d5f6
commit 5e6101dd3e
7 changed files with 85 additions and 59 deletions
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90
Kernel/FileSystem/TmpFS/Inode.h Normal file
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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/TmpFS/FileSystem.h>
#include <Kernel/Memory/AnonymousVMObject.h>
namespace Kernel {
class TmpFSInode final : public Inode {
friend class TmpFS;
public:
virtual ~TmpFSInode() override;
TmpFS& fs() { return static_cast<TmpFS&>(Inode::fs()); }
TmpFS const& fs() const { return static_cast<TmpFS const&>(Inode::fs()); }
// ^Inode
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<NonnullLockRefPtr<Inode>> lookup(StringView name) override;
virtual ErrorOr<void> flush_metadata() override;
virtual ErrorOr<NonnullLockRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
virtual ErrorOr<void> remove_child(StringView name) override;
virtual ErrorOr<void> chmod(mode_t) override;
virtual ErrorOr<void> chown(UserID, GroupID) override;
virtual ErrorOr<void> truncate(u64) override;
virtual ErrorOr<void> update_timestamps(Optional<time_t> atime, Optional<time_t> ctime, Optional<time_t> mtime) override;
private:
TmpFSInode(TmpFS& fs, InodeMetadata const& metadata, LockWeakPtr<TmpFSInode> parent);
static ErrorOr<NonnullLockRefPtr<TmpFSInode>> try_create(TmpFS&, InodeMetadata const& metadata, LockWeakPtr<TmpFSInode> parent);
static ErrorOr<NonnullLockRefPtr<TmpFSInode>> try_create_root(TmpFS&);
// ^Inode
virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override;
ErrorOr<size_t> do_io_on_content_space(Memory::Region& mapping_region, size_t offset, size_t io_size, UserOrKernelBuffer& buffer, bool write);
struct Child {
NonnullOwnPtr<KString> name;
NonnullLockRefPtr<TmpFSInode> inode;
IntrusiveListNode<Child> list_node {};
using List = IntrusiveList<&Child::list_node>;
};
Child* find_child_by_name(StringView);
InodeMetadata m_metadata;
LockWeakPtr<TmpFSInode> m_parent;
ErrorOr<void> ensure_allocated_blocks(size_t offset, size_t io_size);
ErrorOr<void> truncate_to_block_index(size_t block_index);
ErrorOr<size_t> read_bytes_from_content_space(size_t offset, size_t io_size, UserOrKernelBuffer& buffer) const;
ErrorOr<size_t> write_bytes_to_content_space(size_t offset, size_t io_size, UserOrKernelBuffer const& buffer);
struct DataBlock {
public:
using List = Vector<OwnPtr<DataBlock>>;
static ErrorOr<NonnullOwnPtr<DataBlock>> create();
constexpr static size_t block_size = 128 * KiB;
Memory::AnonymousVMObject& vmobject() { return *m_content_buffer_vmobject; }
Memory::AnonymousVMObject const& vmobject() const { return *m_content_buffer_vmobject; }
private:
explicit DataBlock(NonnullLockRefPtr<Memory::AnonymousVMObject> content_buffer_vmobject)
: m_content_buffer_vmobject(move(content_buffer_vmobject))
{
}
NonnullLockRefPtr<Memory::AnonymousVMObject> m_content_buffer_vmobject;
};
DataBlock::List m_blocks;
Child::List m_children;
};
}