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#pragma once
#include <Kernel/Lock.h>
#include <AK/Types.h>
#include <Kernel/FileSystem/FileSystem.h>
class Process;
class ProcFSInode;
class ProcFS final : public FS {
friend class ProcFSInode;
public:
[[gnu::pure]] static ProcFS& the();
virtual ~ProcFS() override;
static Retained<ProcFS> create();
virtual bool initialize() override;
virtual const char* class_name() const override;
virtual InodeIdentifier root_inode() const override;
virtual RetainPtr<Inode> get_inode(InodeIdentifier) const override;
virtual RetainPtr<Inode> create_inode(InodeIdentifier parent_id, const String& name, mode_t, off_t size, int& error) override;
virtual RetainPtr<Inode> create_directory(InodeIdentifier parent_id, const String& name, mode_t, int& error) override;
void add_sys_file(String&&, Function<ByteBuffer(ProcFSInode&)>&& read_callback, Function<ssize_t(ProcFSInode&, const ByteBuffer&)>&& write_callback);
void add_sys_bool(String&&, Lockable<bool>&, Function<void()>&& notify_callback = nullptr);
void add_sys_string(String&&, Lockable<String>&, Function<void()>&& notify_callback = nullptr);
private:
ProcFS();
struct ProcFSDirectoryEntry {
ProcFSDirectoryEntry() { }
ProcFSDirectoryEntry(const char* a_name, unsigned a_proc_file_type, Function<ByteBuffer(InodeIdentifier)>&& a_read_callback = nullptr, Function<ssize_t(InodeIdentifier, const ByteBuffer&)>&& a_write_callback = nullptr, RetainPtr<ProcFSInode>&& a_inode = nullptr)
: name(a_name)
, proc_file_type(a_proc_file_type)
, read_callback(move(a_read_callback))
, write_callback(move(a_write_callback))
, inode(move(a_inode))
{
}
const char* name { nullptr };
unsigned proc_file_type { 0 };
Function<ByteBuffer(InodeIdentifier)> read_callback;
Function<ssize_t(InodeIdentifier, const ByteBuffer&)> write_callback;
RetainPtr<ProcFSInode> inode;
InodeIdentifier identifier(unsigned fsid) const;
};
ProcFSDirectoryEntry* get_directory_entry(InodeIdentifier) const;
Vector<ProcFSDirectoryEntry> m_entries;
Vector<ProcFSDirectoryEntry> m_sys_entries;
mutable Lock m_inodes_lock;
mutable HashMap<unsigned, ProcFSInode*> m_inodes;
RetainPtr<ProcFSInode> m_root_inode;
Lockable<bool> m_kmalloc_stack_helper;
};
struct ProcFSInodeCustomData {
virtual ~ProcFSInodeCustomData();
};
class ProcFSInode final : public Inode {
friend class ProcFS;
public:
virtual ~ProcFSInode() override;
void set_custom_data(OwnPtr<ProcFSInodeCustomData>&& custom_data) { m_custom_data = move(custom_data); }
ProcFSInodeCustomData* custom_data() { return m_custom_data.ptr(); }
const ProcFSInodeCustomData* custom_data() const { return m_custom_data.ptr(); }
private:
// ^Inode
virtual ssize_t read_bytes(off_t, ssize_t, byte* buffer, FileDescriptor*) const override;
virtual InodeMetadata metadata() const override;
virtual bool traverse_as_directory(Function<bool(const FS::DirectoryEntry&)>) const override;
virtual InodeIdentifier lookup(const String& name) override;
virtual String reverse_lookup(InodeIdentifier) override;
virtual void flush_metadata() override;
virtual ssize_t write_bytes(off_t, ssize_t, const byte* buffer, FileDescriptor*) override;
virtual KResult add_child(InodeIdentifier child_id, const String& name, byte file_type) override;
virtual KResult remove_child(const String& name) override;
virtual RetainPtr<Inode> parent() const override;
virtual size_t directory_entry_count() const override;
virtual KResult chmod(mode_t) override;
virtual KResult chown(uid_t, gid_t) override;
ProcFS& fs() { return static_cast<ProcFS&>(Inode::fs()); }
const ProcFS& fs() const { return static_cast<const ProcFS&>(Inode::fs()); }
ProcFSInode(ProcFS&, unsigned index);
OwnPtr<ProcFSInodeCustomData> m_custom_data;
};
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