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156 lines
5.9 KiB
C++
156 lines
5.9 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
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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/Error.h>
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#include <AK/Function.h>
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#include <AK/HashTable.h>
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#include <AK/IntrusiveList.h>
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#include <Kernel/FileSystem/FIFO.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/InodeIdentifier.h>
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#include <Kernel/FileSystem/InodeMetadata.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Library/ListedRefCounted.h>
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#include <Kernel/Library/LockWeakPtr.h>
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#include <Kernel/Locking/Mutex.h>
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#include <Kernel/Memory/SharedInodeVMObject.h>
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namespace Kernel {
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enum class ShouldBlock {
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No = 0,
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Yes = 1
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};
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class Inode : public ListedRefCounted<Inode, LockType::Spinlock>
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, public LockWeakable<Inode> {
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friend class VirtualFileSystem;
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friend class FileSystem;
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friend class InodeFile;
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public:
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virtual ~Inode();
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virtual void remove_from_secondary_lists() { }
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FileSystem& fs() { return m_file_system; }
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FileSystem const& fs() const { return m_file_system; }
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FileSystemID fsid() const { return m_file_system.fsid(); }
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InodeIndex index() const { return m_index; }
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size_t size() const { return metadata().size; }
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bool is_symlink() const { return metadata().is_symlink(); }
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bool is_directory() const { return metadata().is_directory(); }
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bool is_character_device() const { return metadata().is_character_device(); }
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mode_t mode() const { return metadata().mode; }
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InodeIdentifier identifier() const { return { fsid(), index() }; }
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virtual InodeMetadata metadata() const = 0;
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ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const& data, OpenFileDescription*);
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ErrorOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const;
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ErrorOr<size_t> read_until_filled_or_end(off_t, size_t, UserOrKernelBuffer buffer, OpenFileDescription*) const;
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virtual ErrorOr<void> attach(OpenFileDescription&) { return {}; }
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virtual void detach(OpenFileDescription&) { }
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virtual void did_seek(OpenFileDescription&, off_t) { }
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const = 0;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) = 0;
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) = 0;
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virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) = 0;
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virtual ErrorOr<void> remove_child(StringView name) = 0;
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/// Replace child atomically, incrementing the link count of the replacement
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/// inode and decrementing the older inode's.
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virtual ErrorOr<void> replace_child(StringView name, Inode&) = 0;
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virtual ErrorOr<void> chmod(mode_t) = 0;
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virtual ErrorOr<void> chown(UserID, GroupID) = 0;
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virtual ErrorOr<void> truncate(u64) { return {}; }
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ErrorOr<NonnullRefPtr<Custody>> resolve_as_link(Credentials const&, Custody& base, RefPtr<Custody>* out_parent, int options, int symlink_recursion_level) const;
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virtual ErrorOr<int> get_block_address(int) { return ENOTSUP; }
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LockRefPtr<LocalSocket> bound_socket() const;
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bool bind_socket(LocalSocket&);
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bool unbind_socket();
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bool is_metadata_dirty() const { return m_metadata_dirty; }
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virtual ErrorOr<void> update_timestamps(Optional<UnixDateTime> atime, Optional<UnixDateTime> ctime, Optional<UnixDateTime> mtime);
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virtual ErrorOr<void> increment_link_count();
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virtual ErrorOr<void> decrement_link_count();
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virtual ErrorOr<void> flush_metadata() = 0;
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void will_be_destroyed();
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ErrorOr<void> set_shared_vmobject(Memory::SharedInodeVMObject&);
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LockRefPtr<Memory::SharedInodeVMObject> shared_vmobject() const;
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static void sync_all();
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void sync();
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bool has_watchers() const;
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ErrorOr<void> register_watcher(Badge<InodeWatcher>, InodeWatcher&);
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void unregister_watcher(Badge<InodeWatcher>, InodeWatcher&);
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ErrorOr<NonnullRefPtr<FIFO>> fifo();
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bool can_apply_flock(flock const&, Optional<OpenFileDescription const&> = {}) const;
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ErrorOr<void> apply_flock(Process const&, OpenFileDescription const&, Userspace<flock const*>, ShouldBlock);
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ErrorOr<void> get_flock(OpenFileDescription const&, Userspace<flock*>) const;
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void remove_flocks_for_description(OpenFileDescription const&);
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Thread::FlockBlockerSet& flock_blocker_set() { return m_flock_blocker_set; }
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protected:
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Inode(FileSystem&, InodeIndex);
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void set_metadata_dirty(bool);
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ErrorOr<void> prepare_to_write_data();
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void did_add_child(InodeIdentifier child_id, StringView);
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void did_remove_child(InodeIdentifier child_id, StringView);
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void did_modify_contents();
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void did_delete_self();
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mutable Mutex m_inode_lock { "Inode"sv };
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virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& data, OpenFileDescription*) = 0;
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virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const = 0;
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private:
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ErrorOr<bool> try_apply_flock(Process const&, OpenFileDescription const&, flock const&);
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FileSystem& m_file_system;
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InodeIndex m_index { 0 };
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LockWeakPtr<Memory::SharedInodeVMObject> m_shared_vmobject;
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LockWeakPtr<LocalSocket> m_bound_socket;
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SpinlockProtected<HashTable<InodeWatcher*>, LockRank::None> m_watchers {};
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bool m_metadata_dirty { false };
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RefPtr<FIFO> m_fifo;
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IntrusiveListNode<Inode> m_inode_list_node;
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struct Flock {
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off_t start;
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off_t len;
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OpenFileDescription const* owner;
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pid_t pid;
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short type;
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};
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Thread::FlockBlockerSet m_flock_blocker_set;
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SpinlockProtected<Vector<Flock>, LockRank::None> m_flocks {};
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public:
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using AllInstancesList = IntrusiveList<&Inode::m_inode_list_node>;
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static SpinlockProtected<Inode::AllInstancesList, LockRank::None>& all_instances();
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};
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}
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