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https://github.com/SerenityOS/serenity.git
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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
95 lines
3.1 KiB
C++
95 lines
3.1 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 <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 ErrorOr<NonnullRefPtr<TmpFS>> try_create();
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virtual ErrorOr<void> 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 Inode& root_inode() 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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ErrorOr<NonnullRefPtr<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 ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<void> traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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virtual ErrorOr<void> flush_metadata() override;
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virtual ErrorOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, OpenFileDescription*) override;
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
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virtual ErrorOr<void> add_child(Inode&, const StringView& name, mode_t) override;
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virtual ErrorOr<void> remove_child(const StringView& name) override;
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virtual ErrorOr<void> chmod(mode_t) override;
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virtual ErrorOr<void> chown(UserID, GroupID) override;
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virtual ErrorOr<void> truncate(u64) override;
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virtual ErrorOr<void> set_atime(time_t) override;
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virtual ErrorOr<void> set_ctime(time_t) override;
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virtual ErrorOr<void> 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, const InodeMetadata& metadata, InodeIdentifier parent);
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static ErrorOr<NonnullRefPtr<TmpFSInode>> try_create(TmpFS&, InodeMetadata const& metadata, InodeIdentifier parent);
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static ErrorOr<NonnullRefPtr<TmpFSInode>> try_create_root(TmpFS&);
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void notify_watchers();
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struct Child {
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NonnullOwnPtr<KString> name;
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NonnullRefPtr<TmpFSInode> inode;
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IntrusiveListNode<Child> list_node {};
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using List = IntrusiveList<&Child::list_node>;
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};
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Child* find_child_by_name(StringView);
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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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Child::List m_children;
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};
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}
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