mirror of
https://github.com/RGBCube/serenity
synced 2025-05-18 07:15:08 +00:00
c88cc8557f
We make these methods non-virtual because we want to ensure we properly enforce locking of the m_inode_lock mutex. Also, for write operations, we want to call prepare_to_write_data before the actual write. The previous design required us to ensure the callers do that at various places which lead to hard-to-find bugs. By moving everything to a place where we call prepare_to_write_data only once, we eliminate a possibilty of forgeting to call it on some code path in the kernel.
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
/*
|
|
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/FileSystem/FileSystem.h>
|
|
#include <Kernel/FileSystem/Inode.h>
|
|
#include <Kernel/KBuffer.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class TmpFSInode;
|
|
|
|
class TmpFS final : public FileSystem {
|
|
friend class TmpFSInode;
|
|
|
|
public:
|
|
virtual ~TmpFS() override;
|
|
static ErrorOr<NonnullLockRefPtr<FileSystem>> try_create();
|
|
virtual ErrorOr<void> initialize() override;
|
|
|
|
virtual StringView class_name() const override { return "TmpFS"sv; }
|
|
|
|
virtual bool supports_watchers() const override { return true; }
|
|
|
|
virtual Inode& root_inode() override;
|
|
|
|
private:
|
|
TmpFS();
|
|
|
|
LockRefPtr<TmpFSInode> m_root_inode;
|
|
|
|
unsigned m_next_inode_index { 1 };
|
|
unsigned next_inode_index();
|
|
};
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
OwnPtr<KBuffer> m_content;
|
|
|
|
Child::List m_children;
|
|
};
|
|
|
|
}
|