mirror of
https://github.com/RGBCube/serenity
synced 2025-05-23 18:15:06 +00:00
cf16b2c8e6
This forces anyone who wants to look into and/or manipulate an address space to lock it. And this replaces the previous, more flimsy, manual spinlock use. Note that pointers *into* the address space are not safe to use after you unlock the space. We've got many issues like this, and we'll have to track those down as wlel.
161 lines
4.5 KiB
C++
161 lines
4.5 KiB
C++
/*
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* Copyright (c) 2018-2022, 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/AtomicRefCounted.h>
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#include <AK/Badge.h>
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#include <AK/RefPtr.h>
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#include <Kernel/FileSystem/FIFO.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/InodeMetadata.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/KBuffer.h>
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#include <Kernel/VirtualAddress.h>
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namespace Kernel {
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class OpenFileDescriptionData {
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public:
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virtual ~OpenFileDescriptionData() = default;
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};
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class OpenFileDescription final : public AtomicRefCounted<OpenFileDescription> {
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public:
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static ErrorOr<NonnullLockRefPtr<OpenFileDescription>> try_create(Custody&);
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static ErrorOr<NonnullLockRefPtr<OpenFileDescription>> try_create(File&);
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~OpenFileDescription();
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Thread::FileBlocker::BlockFlags should_unblock(Thread::FileBlocker::BlockFlags) const;
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bool is_readable() const;
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void set_readable(bool);
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bool is_writable() const;
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void set_writable(bool);
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void set_rw_mode(int options);
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ErrorOr<void> close();
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ErrorOr<off_t> seek(off_t, int whence);
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ErrorOr<size_t> read(UserOrKernelBuffer&, size_t);
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ErrorOr<size_t> write(UserOrKernelBuffer const& data, size_t);
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ErrorOr<struct stat> stat();
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// NOTE: These ignore the current offset of this file description.
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ErrorOr<size_t> read(UserOrKernelBuffer&, u64 offset, size_t);
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ErrorOr<size_t> write(u64 offset, UserOrKernelBuffer const&, size_t);
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ErrorOr<void> chmod(Credentials const& credentials, mode_t);
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bool can_read() const;
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bool can_write() const;
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ErrorOr<size_t> get_dir_entries(UserOrKernelBuffer& buffer, size_t);
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ErrorOr<NonnullOwnPtr<KBuffer>> read_entire_file();
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ErrorOr<NonnullOwnPtr<KString>> original_absolute_path() const;
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ErrorOr<NonnullOwnPtr<KString>> pseudo_path() const;
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bool is_direct() const;
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bool is_directory() const;
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File& file() { return *m_file; }
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File const& file() const { return *m_file; }
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bool is_device() const;
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Device const* device() const;
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Device* device();
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bool is_tty() const;
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const TTY* tty() const;
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TTY* tty();
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bool is_inode_watcher() const;
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InodeWatcher const* inode_watcher() const;
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InodeWatcher* inode_watcher();
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bool is_master_pty() const;
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MasterPTY const* master_pty() const;
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MasterPTY* master_pty();
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InodeMetadata metadata() const;
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Inode* inode() { return m_inode.ptr(); }
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Inode const* inode() const { return m_inode.ptr(); }
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RefPtr<Custody> custody();
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RefPtr<Custody const> custody() const;
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ErrorOr<Memory::Region*> mmap(Process&, Memory::AddressSpace&, Memory::VirtualRange const&, u64 offset, int prot, bool shared);
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bool is_blocking() const;
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void set_blocking(bool b);
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bool should_append() const;
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u32 file_flags() const;
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void set_file_flags(u32);
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bool is_socket() const;
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Socket* socket();
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Socket const* socket() const;
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bool is_fifo() const;
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FIFO* fifo();
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FIFO::Direction fifo_direction() const;
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void set_fifo_direction(Badge<FIFO>, FIFO::Direction direction);
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OwnPtr<OpenFileDescriptionData>& data();
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void set_original_inode(Badge<VirtualFileSystem>, NonnullLockRefPtr<Inode>&& inode) { m_inode = move(inode); }
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void set_original_custody(Badge<VirtualFileSystem>, Custody& custody);
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ErrorOr<void> truncate(u64);
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ErrorOr<void> sync();
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off_t offset() const;
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ErrorOr<void> chown(Credentials const& credentials, UserID, GroupID);
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FileBlockerSet& blocker_set();
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ErrorOr<void> apply_flock(Process const&, Userspace<flock const*>, ShouldBlock);
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ErrorOr<void> get_flock(Userspace<flock*>) const;
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private:
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friend class VirtualFileSystem;
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explicit OpenFileDescription(File&);
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ErrorOr<void> attach();
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void evaluate_block_conditions()
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{
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blocker_set().unblock_all_blockers_whose_conditions_are_met();
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}
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LockRefPtr<Inode> m_inode;
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NonnullLockRefPtr<File> m_file;
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struct State {
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OwnPtr<OpenFileDescriptionData> data;
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RefPtr<Custody> custody;
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off_t current_offset { 0 };
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u32 file_flags { 0 };
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bool readable : 1 { false };
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bool writable : 1 { false };
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bool is_blocking : 1 { true };
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bool is_directory : 1 { false };
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bool should_append : 1 { false };
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bool direct : 1 { false };
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FIFO::Direction fifo_direction : 2 { FIFO::Direction::Neither };
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};
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SpinlockProtected<State> m_state { LockRank::None };
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};
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}
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