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e6fc7b3ff7
The main place where this is a little iffy is in RAMFS where inodes have a LockWeakPtr to their parent inode. I've left that as a LockWeakPtr for now.
94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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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/AtomicRefCounted.h>
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#include <AK/Error.h>
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#include <AK/Function.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Library/LockRefPtr.h>
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namespace Kernel {
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struct SysFSInodeData : public OpenFileDescriptionData {
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OwnPtr<KBuffer> buffer;
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};
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class SysFSDirectory;
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class SysFSComponent : public AtomicRefCounted<SysFSComponent> {
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friend class SysFSDirectory;
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public:
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virtual StringView name() const = 0;
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { return Error::from_errno(ENOTIMPL); }
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
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virtual LockRefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
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virtual mode_t permissions() const;
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virtual ErrorOr<void> truncate(u64) { return EPERM; }
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virtual size_t size() const { return 0; }
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virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) { return EROFS; }
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virtual ErrorOr<void> refresh_data(OpenFileDescription&) const { return {}; }
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virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const&) const;
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InodeIndex component_index() const { return m_component_index; };
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virtual ~SysFSComponent() = default;
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ErrorOr<NonnullOwnPtr<KString>> relative_path(NonnullOwnPtr<KString>, size_t current_hop = 0) const;
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ErrorOr<size_t> relative_path_hops_count_from_mountpoint(size_t current_hop = 0) const;
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protected:
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explicit SysFSComponent(SysFSDirectory const& parent_directory);
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SysFSComponent();
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LockRefPtr<SysFSDirectory> m_parent_directory;
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IntrusiveListNode<SysFSComponent, NonnullLockRefPtr<SysFSComponent>> m_list_node;
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private:
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InodeIndex m_component_index {};
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};
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class SysFSSymbolicLink : public SysFSComponent {
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public:
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const override final;
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virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
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protected:
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ErrorOr<NonnullOwnPtr<KString>> try_generate_return_path_to_mount_point() const;
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ErrorOr<NonnullOwnPtr<KBuffer>> try_to_generate_buffer() const;
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explicit SysFSSymbolicLink(SysFSDirectory const& parent_directory, SysFSComponent const& pointed_component);
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LockRefPtr<SysFSComponent> m_pointed_component;
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};
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class SysFSDirectory : public SysFSComponent {
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public:
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override final;
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virtual LockRefPtr<SysFSComponent> lookup(StringView name) override final;
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virtual ErrorOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
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using ChildList = SpinlockProtected<IntrusiveList<&SysFSComponent::m_list_node>, LockRank::None>;
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protected:
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virtual bool is_root_directory() const { return false; }
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SysFSDirectory() {};
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explicit SysFSDirectory(SysFSDirectory const& parent_directory);
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ChildList m_child_components {};
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};
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}
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