mirror of
https://github.com/RGBCube/serenity
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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.
96 lines
3.4 KiB
C++
96 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 <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/SysFS/Component.h>
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#include <Kernel/Locking/MutexProtected.h>
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namespace Kernel {
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class SysFS final : public FileSystem {
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friend class SysFSInode;
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friend class SysFSDirectoryInode;
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public:
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virtual ~SysFS() override;
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static ErrorOr<NonnullLockRefPtr<FileSystem>> try_create();
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virtual ErrorOr<void> initialize() override;
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virtual StringView class_name() const override { return "SysFS"sv; }
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virtual Inode& root_inode() override;
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private:
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SysFS();
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LockRefPtr<SysFSInode> m_root_inode;
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};
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class SysFSInode : public Inode {
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friend class SysFS;
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friend class SysFSDirectoryInode;
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public:
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static ErrorOr<NonnullLockRefPtr<SysFSInode>> try_create(SysFS const&, SysFSComponent const&);
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StringView name() const { return m_associated_component->name(); }
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protected:
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SysFSInode(SysFS const&, SysFSComponent const&);
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virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullLockRefPtr<Inode>> lookup(StringView name) override;
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virtual ErrorOr<void> flush_metadata() override;
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) override;
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virtual ErrorOr<NonnullLockRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
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virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
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virtual ErrorOr<void> remove_child(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> update_timestamps(Optional<time_t> atime, Optional<time_t> ctime, Optional<time_t> mtime) override;
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virtual ErrorOr<void> attach(OpenFileDescription& description) override final;
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virtual void did_seek(OpenFileDescription&, off_t) override final;
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NonnullLockRefPtr<SysFSComponent> m_associated_component;
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};
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class SysFSLinkInode : public SysFSInode {
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friend class SysFS;
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public:
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static ErrorOr<NonnullLockRefPtr<SysFSLinkInode>> try_create(SysFS const&, SysFSComponent const&);
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virtual ~SysFSLinkInode() override;
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protected:
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SysFSLinkInode(SysFS const&, SysFSComponent const&);
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// ^Inode
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virtual InodeMetadata metadata() const override;
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};
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class SysFSDirectoryInode : public SysFSInode {
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friend class SysFS;
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public:
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static ErrorOr<NonnullLockRefPtr<SysFSDirectoryInode>> try_create(SysFS const&, SysFSComponent const&);
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virtual ~SysFSDirectoryInode() override;
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SysFS& fs() { return static_cast<SysFS&>(Inode::fs()); }
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SysFS const& fs() const { return static_cast<SysFS const&>(Inode::fs()); }
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protected:
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SysFSDirectoryInode(SysFS const&, SysFSComponent const&);
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// ^Inode
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullLockRefPtr<Inode>> lookup(StringView name) override;
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};
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}
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