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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/HashMap.h>
#include <AK/Types.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/Forward.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/Locking/Mutex.h>
#include <Kernel/ProcessExposed.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
class ProcFS final : public FileSystem {
friend class ProcFSInode;
friend class ProcFSDirectoryInode;
friend class ProcFSProcessDirectoryInode;
friend class ProcFSGlobalInode;
friend class ProcFSAssociatedProcessInode;
friend class ProcFSProcessSubDirectoryInode;
public:
virtual ~ProcFS() override;
static ErrorOr<NonnullRefPtr<ProcFS>> try_create();
virtual ErrorOr<void> initialize() override;
virtual StringView class_name() const override { return "ProcFS"sv; }
virtual Inode& root_inode() override;
private:
ProcFS();
RefPtr<ProcFSDirectoryInode> m_root_inode;
};
class ProcFSInode : public Inode {
friend class ProcFS;
public:
virtual ~ProcFSInode() override;
protected:
ProcFSInode(const ProcFS&, InodeIndex);
ProcFS& procfs() { return static_cast<ProcFS&>(Inode::fs()); }
ProcFS const& procfs() const { return static_cast<ProcFS const&>(Inode::fs()); }
// ^Inode
virtual ErrorOr<void> attach(OpenFileDescription& description) override = 0;
virtual void did_seek(OpenFileDescription&, off_t) override = 0;
virtual ErrorOr<void> flush_metadata() override final;
virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override final;
virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override final;
virtual ErrorOr<void> remove_child(StringView name) override final;
virtual ErrorOr<void> chmod(mode_t) override final;
virtual ErrorOr<void> chown(UserID, GroupID) override final;
};
class ProcFSGlobalInode : public ProcFSInode {
friend class ProcFS;
public:
static ErrorOr<NonnullRefPtr<ProcFSGlobalInode>> try_create(const ProcFS&, const ProcFSExposedComponent&);
virtual ~ProcFSGlobalInode() override {};
StringView name() const;
protected:
ProcFSGlobalInode(const ProcFS&, const ProcFSExposedComponent&);
// ^Inode
virtual ErrorOr<void> attach(OpenFileDescription& description) override final;
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override final;
virtual ErrorOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, OpenFileDescription*) override final;
virtual void did_seek(OpenFileDescription&, off_t) override final;
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView) override;
virtual ErrorOr<void> truncate(u64) override final;
virtual ErrorOr<void> set_mtime(time_t) override final;
NonnullRefPtr<ProcFSExposedComponent> m_associated_component;
};
class ProcFSLinkInode : public ProcFSGlobalInode {
friend class ProcFS;
public:
static ErrorOr<NonnullRefPtr<ProcFSLinkInode>> try_create(const ProcFS&, const ProcFSExposedComponent&);
protected:
ProcFSLinkInode(const ProcFS&, const ProcFSExposedComponent&);
virtual InodeMetadata metadata() const override;
};
class ProcFSDirectoryInode final : public ProcFSGlobalInode {
friend class ProcFS;
public:
static ErrorOr<NonnullRefPtr<ProcFSDirectoryInode>> try_create(const ProcFS&, const ProcFSExposedComponent&);
virtual ~ProcFSDirectoryInode() override;
protected:
ProcFSDirectoryInode(const ProcFS&, const ProcFSExposedComponent&);
// ^Inode
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
};
class ProcFSProcessAssociatedInode : public ProcFSInode {
friend class ProcFS;
protected:
ProcFSProcessAssociatedInode(const ProcFS&, ProcessID, InodeIndex);
ProcessID associated_pid() const { return m_pid; }
// ^Inode
virtual ErrorOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer& buffer, OpenFileDescription*) override final;
private:
const ProcessID m_pid;
};
class ProcFSProcessDirectoryInode final : public ProcFSProcessAssociatedInode {
friend class ProcFS;
public:
static ErrorOr<NonnullRefPtr<ProcFSProcessDirectoryInode>> try_create(const ProcFS&, ProcessID);
private:
ProcFSProcessDirectoryInode(const ProcFS&, ProcessID);
// ^Inode
virtual ErrorOr<void> attach(OpenFileDescription& description) override;
virtual void did_seek(OpenFileDescription&, off_t) override { }
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override final;
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
};
class ProcFSProcessSubDirectoryInode final : public ProcFSProcessAssociatedInode {
friend class ProcFS;
public:
static ErrorOr<NonnullRefPtr<ProcFSProcessSubDirectoryInode>> try_create(const ProcFS&, SegmentedProcFSIndex::ProcessSubDirectory, ProcessID);
private:
ProcFSProcessSubDirectoryInode(const ProcFS&, SegmentedProcFSIndex::ProcessSubDirectory, ProcessID);
// ^Inode
virtual ErrorOr<void> attach(OpenFileDescription& description) override;
virtual void did_seek(OpenFileDescription&, off_t) override;
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override final;
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
const SegmentedProcFSIndex::ProcessSubDirectory m_sub_directory_type;
};
class ProcFSProcessPropertyInode final : public ProcFSProcessAssociatedInode {
friend class ProcFS;
public:
static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_file_description_link(const ProcFS&, unsigned, ProcessID);
static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_thread_stack(const ProcFS&, ThreadID, ProcessID);
static ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> try_create_for_pid_property(const ProcFS&, SegmentedProcFSIndex::MainProcessProperty, ProcessID);
private:
ProcFSProcessPropertyInode(const ProcFS&, SegmentedProcFSIndex::MainProcessProperty, ProcessID);
ProcFSProcessPropertyInode(const ProcFS&, ThreadID, ProcessID);
ProcFSProcessPropertyInode(const ProcFS&, unsigned, ProcessID);
// ^Inode
virtual ErrorOr<void> attach(OpenFileDescription& description) override;
virtual void did_seek(OpenFileDescription&, off_t) override;
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override final;
virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override final;
ErrorOr<void> refresh_data(OpenFileDescription& description);
ErrorOr<void> try_to_acquire_data(Process& process, KBufferBuilder& builder) const;
const SegmentedProcFSIndex::ProcessSubDirectory m_parent_sub_directory_type;
union {
SegmentedProcFSIndex::MainProcessProperty property_type;
unsigned property_index;
} m_possible_data;
mutable Mutex m_refresh_lock;
};
}
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