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/*
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/AtomicRefCounted.h>
#include <AK/Badge.h>
#include <AK/RefPtr.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/FIFO.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/Forward.h>
#include <Kernel/KBuffer.h>
#include <Kernel/VirtualAddress.h>
namespace Kernel {
class OpenFileDescriptionData {
public:
virtual ~OpenFileDescriptionData() = default;
};
class OpenFileDescription final : public AtomicRefCounted<OpenFileDescription> {
public:
static ErrorOr<NonnullRefPtr<OpenFileDescription>> try_create(Custody&);
static ErrorOr<NonnullRefPtr<OpenFileDescription>> try_create(File&);
~OpenFileDescription();
Thread::FileBlocker::BlockFlags should_unblock(Thread::FileBlocker::BlockFlags) const;
bool is_readable() const;
void set_readable(bool);
bool is_writable() const;
void set_writable(bool);
void set_rw_mode(int options);
ErrorOr<void> close();
ErrorOr<off_t> seek(off_t, int whence);
ErrorOr<size_t> read(UserOrKernelBuffer&, size_t);
ErrorOr<size_t> write(UserOrKernelBuffer const& data, size_t);
ErrorOr<struct stat> stat();
// NOTE: These ignore the current offset of this file description.
ErrorOr<size_t> read(UserOrKernelBuffer&, u64 offset, size_t);
ErrorOr<size_t> write(u64 offset, UserOrKernelBuffer const&, size_t);
ErrorOr<void> chmod(Credentials const& credentials, mode_t);
bool can_read() const;
bool can_write() const;
ErrorOr<size_t> get_dir_entries(UserOrKernelBuffer& buffer, size_t);
ErrorOr<NonnullOwnPtr<KString>> original_absolute_path() const;
ErrorOr<NonnullOwnPtr<KString>> pseudo_path() const;
bool is_direct() const;
bool is_directory() const;
File& file() { return *m_file; }
File const& file() const { return *m_file; }
bool is_device() const;
Device const* device() const;
Device* device();
bool is_tty() const;
const TTY* tty() const;
TTY* tty();
bool is_inode_watcher() const;
InodeWatcher const* inode_watcher() const;
InodeWatcher* inode_watcher();
bool is_master_pty() const;
MasterPTY const* master_pty() const;
MasterPTY* master_pty();
InodeMetadata metadata() const;
Inode* inode() { return m_inode.ptr(); }
Inode const* inode() const { return m_inode.ptr(); }
RefPtr<Custody> custody();
RefPtr<Custody const> custody() const;
ErrorOr<NonnullLockRefPtr<Memory::VMObject>> vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64& offset, bool shared);
bool is_blocking() const;
void set_blocking(bool b);
bool should_append() const;
u32 file_flags() const;
void set_file_flags(u32);
bool is_socket() const;
Socket* socket();
Socket const* socket() const;
bool is_fifo() const;
FIFO* fifo();
FIFO::Direction fifo_direction() const;
void set_fifo_direction(Badge<FIFO>, FIFO::Direction direction);
OwnPtr<OpenFileDescriptionData>& data();
void set_original_inode(Badge<VirtualFileSystem>, NonnullRefPtr<Inode> inode) { m_inode = move(inode); }
void set_original_custody(Badge<VirtualFileSystem>, Custody& custody);
ErrorOr<void> truncate(u64);
ErrorOr<void> sync();
off_t offset() const;
ErrorOr<void> chown(Credentials const& credentials, UserID, GroupID);
FileBlockerSet& blocker_set();
ErrorOr<void> apply_flock(Process const&, Userspace<flock const*>, ShouldBlock);
ErrorOr<void> get_flock(Userspace<flock*>) const;
private:
friend class VirtualFileSystem;
explicit OpenFileDescription(File&);
ErrorOr<void> attach();
void evaluate_block_conditions()
{
blocker_set().unblock_all_blockers_whose_conditions_are_met();
}
RefPtr<Inode> m_inode;
NonnullRefPtr<File> const m_file;
struct State {
OwnPtr<OpenFileDescriptionData> data;
RefPtr<Custody> custody;
off_t current_offset { 0 };
u32 file_flags { 0 };
bool readable : 1 { false };
bool writable : 1 { false };
bool is_blocking : 1 { true };
bool is_directory : 1 { false };
bool should_append : 1 { false };
bool direct : 1 { false };
FIFO::Direction fifo_direction : 2 { FIFO::Direction::Neither };
};
SpinlockProtected<State, LockRank::None> m_state {};
};
}
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