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94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/HashMap.h>
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#include <AK/Optional.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/KBuffer.h>
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namespace Kernel {
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class TmpFSInode;
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class TmpFS final : public FileSystem {
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friend class TmpFSInode;
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public:
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virtual ~TmpFS() override;
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static RefPtr<TmpFS> create();
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virtual bool initialize() override;
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virtual StringView class_name() const override { return "TmpFS"sv; }
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virtual bool supports_watchers() const override { return true; }
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virtual NonnullRefPtr<Inode> root_inode() const override;
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private:
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TmpFS();
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RefPtr<TmpFSInode> m_root_inode;
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HashMap<InodeIndex, NonnullRefPtr<TmpFSInode>> m_inodes;
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RefPtr<Inode> get_inode(InodeIdentifier identifier) const;
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void register_inode(TmpFSInode&);
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void unregister_inode(InodeIdentifier);
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unsigned m_next_inode_index { 1 };
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unsigned next_inode_index();
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};
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class TmpFSInode final : public Inode {
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friend class TmpFS;
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public:
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virtual ~TmpFSInode() override;
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TmpFS& fs() { return static_cast<TmpFS&>(Inode::fs()); }
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const TmpFS& fs() const { return static_cast<const TmpFS&>(Inode::fs()); }
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// ^Inode
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virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, FileDescription*) const override;
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virtual InodeMetadata metadata() const override;
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virtual KResult traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<Inode> lookup(StringView name) override;
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virtual void flush_metadata() override;
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virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, FileDescription*) override;
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virtual KResultOr<NonnullRefPtr<Inode>> create_child(const String& name, mode_t, dev_t, uid_t, gid_t) override;
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virtual KResult add_child(Inode&, const StringView& name, mode_t) override;
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virtual KResult remove_child(const StringView& name) override;
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virtual KResultOr<size_t> directory_entry_count() const override;
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virtual KResult chmod(mode_t) override;
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virtual KResult chown(uid_t, gid_t) override;
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virtual KResult truncate(u64) override;
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virtual KResult set_atime(time_t) override;
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virtual KResult set_ctime(time_t) override;
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virtual KResult set_mtime(time_t) override;
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virtual void one_ref_left() override;
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private:
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TmpFSInode(TmpFS& fs, InodeMetadata metadata, InodeIdentifier parent);
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static RefPtr<TmpFSInode> create(TmpFS&, InodeMetadata metadata, InodeIdentifier parent);
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static RefPtr<TmpFSInode> create_root(TmpFS&);
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void notify_watchers();
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InodeMetadata m_metadata;
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InodeIdentifier m_parent;
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OwnPtr<KBuffer> m_content;
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struct Child {
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String name;
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NonnullRefPtr<TmpFSInode> inode;
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};
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HashMap<String, Child> m_children;
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};
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}
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