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47bfbe343b
- Use KResultOr and TRY() to propagate errors - Check for OOM errors - Move allocation out of constructors There's still a lot more to do here, as SysFS is still quite brittle in the face of memory pressure.
63 lines
2.1 KiB
C++
63 lines
2.1 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/Function.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <Kernel/API/KResult.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/Forward.h>
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namespace Kernel {
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struct SysFSInodeData : public FileDescriptionData {
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OwnPtr<KBuffer> buffer;
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};
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class SysFSComponent : public RefCounted<SysFSComponent> {
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public:
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virtual StringView name() const { return m_name->view(); }
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virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const { VERIFY_NOT_REACHED(); }
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virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
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virtual RefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
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virtual KResultOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, FileDescription*) { return EROFS; }
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virtual KResult refresh_data(FileDescription&) const { return KSuccess; }
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virtual KResultOr<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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protected:
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explicit SysFSComponent(StringView name);
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private:
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NonnullOwnPtr<KString> m_name;
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InodeIndex m_component_index {};
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};
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class SysFSDirectory : public SysFSComponent {
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public:
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virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override;
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virtual KResultOr<NonnullRefPtr<SysFSInode>> to_inode(SysFS const& sysfs_instance) const override final;
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protected:
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explicit SysFSDirectory(StringView name);
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SysFSDirectory(StringView name, SysFSDirectory const& parent_directory);
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NonnullRefPtrVector<SysFSComponent> m_components;
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RefPtr<SysFSDirectory> m_parent_directory;
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};
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}
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