mirror of
https://github.com/LadybirdBrowser/ladybird.git
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58acdce41f
As with the previous commit, we put a distinction between filesystems that require a file description and those which don't, but now in a much more readable mechanism - all initialization properties as well as the create static method are grouped to create the FileSystemInitializer structure. Then when we need to initialize an instance, we iterate over a table of these structures, checking for matching structure and then validating the given arguments from userspace against the requirements to ensure we can create a valid instance of the requested filesystem.
202 lines
8.1 KiB
C++
202 lines
8.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@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/Types.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/Forward.h>
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#include <Kernel/KBufferBuilder.h>
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#include <Kernel/Locking/Mutex.h>
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#include <Kernel/ProcessExposed.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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class ProcFS final : public FileSystem {
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friend class ProcFSInode;
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friend class ProcFSDirectoryInode;
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friend class ProcFSProcessDirectoryInode;
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friend class ProcFSGlobalInode;
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friend class ProcFSAssociatedProcessInode;
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friend class ProcFSProcessSubDirectoryInode;
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public:
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virtual ~ProcFS() override;
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static ErrorOr<NonnullRefPtr<FileSystem>> try_create();
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virtual ErrorOr<void> initialize() override;
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virtual StringView class_name() const override { return "ProcFS"sv; }
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virtual Inode& root_inode() override;
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private:
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ProcFS();
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RefPtr<ProcFSDirectoryInode> m_root_inode;
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};
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class ProcFSInode : public Inode {
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friend class ProcFS;
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public:
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virtual ~ProcFSInode() override;
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protected:
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ProcFSInode(ProcFS const&, InodeIndex);
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ProcFS& procfs() { return static_cast<ProcFS&>(Inode::fs()); }
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ProcFS const& procfs() const { return static_cast<ProcFS const&>(Inode::fs()); }
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// ^Inode
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virtual ErrorOr<void> attach(OpenFileDescription& description) override = 0;
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virtual void did_seek(OpenFileDescription&, off_t) override = 0;
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virtual ErrorOr<void> flush_metadata() override final;
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override final;
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virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override final;
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virtual ErrorOr<void> remove_child(StringView name) override final;
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virtual ErrorOr<void> chmod(mode_t) override final;
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virtual ErrorOr<void> chown(UserID, GroupID) override final;
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};
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class ProcFSGlobalInode : public ProcFSInode {
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friend class ProcFS;
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public:
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static ErrorOr<NonnullRefPtr<ProcFSGlobalInode>> try_create(ProcFS const&, ProcFSExposedComponent const&);
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virtual ~ProcFSGlobalInode() override {};
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StringView name() const;
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protected:
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ProcFSGlobalInode(ProcFS const&, ProcFSExposedComponent const&);
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// ^Inode
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virtual ErrorOr<void> attach(OpenFileDescription& description) override final;
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virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override final;
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virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override final;
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virtual void did_seek(OpenFileDescription&, off_t) override final;
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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<NonnullRefPtr<Inode>> lookup(StringView) override;
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virtual ErrorOr<void> truncate(u64) override final;
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virtual ErrorOr<void> set_mtime(time_t) override final;
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NonnullRefPtr<ProcFSExposedComponent> m_associated_component;
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};
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class ProcFSLinkInode : public ProcFSGlobalInode {
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friend class ProcFS;
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public:
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static ErrorOr<NonnullRefPtr<ProcFSLinkInode>> try_create(ProcFS const&, ProcFSExposedComponent const&);
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protected:
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ProcFSLinkInode(ProcFS const&, ProcFSExposedComponent const&);
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virtual InodeMetadata metadata() const override;
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};
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class ProcFSDirectoryInode final : public ProcFSGlobalInode {
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friend class ProcFS;
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public:
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static ErrorOr<NonnullRefPtr<ProcFSDirectoryInode>> try_create(ProcFS const&, ProcFSExposedComponent const&);
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virtual ~ProcFSDirectoryInode() override;
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protected:
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ProcFSDirectoryInode(ProcFS const&, ProcFSExposedComponent 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<NonnullRefPtr<Inode>> lookup(StringView name) override;
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};
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class ProcFSProcessAssociatedInode : public ProcFSInode {
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friend class ProcFS;
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protected:
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ProcFSProcessAssociatedInode(ProcFS const&, ProcessID, InodeIndex);
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ProcessID associated_pid() const { return m_pid; }
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// ^Inode
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virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override final;
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private:
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const ProcessID m_pid;
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};
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class ProcFSProcessDirectoryInode final : public ProcFSProcessAssociatedInode {
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friend class ProcFS;
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public:
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static ErrorOr<NonnullRefPtr<ProcFSProcessDirectoryInode>> try_create(ProcFS const&, ProcessID);
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private:
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ProcFSProcessDirectoryInode(ProcFS const&, ProcessID);
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// ^Inode
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virtual ErrorOr<void> attach(OpenFileDescription& description) override;
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virtual void did_seek(OpenFileDescription&, off_t) override { }
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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<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override final;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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};
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class ProcFSProcessSubDirectoryInode final : public ProcFSProcessAssociatedInode {
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friend class ProcFS;
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public:
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static ErrorOr<NonnullRefPtr<ProcFSProcessSubDirectoryInode>> try_create(ProcFS const&, SegmentedProcFSIndex::ProcessSubDirectory, ProcessID);
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private:
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ProcFSProcessSubDirectoryInode(ProcFS const&, SegmentedProcFSIndex::ProcessSubDirectory, ProcessID);
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// ^Inode
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virtual ErrorOr<void> attach(OpenFileDescription& description) override;
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virtual void did_seek(OpenFileDescription&, off_t) override;
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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<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override final;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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const SegmentedProcFSIndex::ProcessSubDirectory m_sub_directory_type;
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};
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class ProcFSProcessPropertyInode final : public ProcFSProcessAssociatedInode {
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friend class ProcFS;
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public:
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static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_file_description_link(ProcFS const&, unsigned, ProcessID);
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static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_thread_stack(ProcFS const&, ThreadID, ProcessID);
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static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_pid_property(ProcFS const&, SegmentedProcFSIndex::MainProcessProperty, ProcessID);
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static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_child_process_link(ProcFS const&, ProcessID, ProcessID);
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private:
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ProcFSProcessPropertyInode(ProcFS const&, SegmentedProcFSIndex::MainProcessProperty, ProcessID);
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ProcFSProcessPropertyInode(ProcFS const&, ThreadID, ProcessID);
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ProcFSProcessPropertyInode(ProcFS const&, unsigned, ProcessID);
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ProcFSProcessPropertyInode(ProcFS const&, ProcessID, ProcessID);
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// ^Inode
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virtual ErrorOr<void> attach(OpenFileDescription& description) override;
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virtual void did_seek(OpenFileDescription&, off_t) override;
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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<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override final;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override final;
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ErrorOr<void> refresh_data(OpenFileDescription& description);
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ErrorOr<void> try_to_acquire_data(Process& process, KBufferBuilder& builder) const;
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const SegmentedProcFSIndex::ProcessSubDirectory m_parent_sub_directory_type;
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union {
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SegmentedProcFSIndex::MainProcessProperty property_type;
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unsigned property_index;
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} m_possible_data;
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mutable Mutex m_refresh_lock;
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};
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}
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