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https://github.com/RGBCube/serenity
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b63a1dda63
Such operation is almost equivalent to writing on an Inode, so lock the Inode m_inode_lock exclusively. All FileSystem Inode implementations then override a new method called truncate_locked which should implement the actual truncating.
95 lines
3.7 KiB
C++
95 lines
3.7 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2022-2023, Liav A. <liavalb@hotmail.co.il>
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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 <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/RAMFS/FileSystem.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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namespace Kernel {
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class RAMFSInode final : public Inode {
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friend class RAMFS;
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public:
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virtual ~RAMFSInode() override;
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RAMFS& fs() { return static_cast<RAMFS&>(Inode::fs()); }
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RAMFS const& fs() const { return static_cast<RAMFS const&>(Inode::fs()); }
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// ^Inode
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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virtual ErrorOr<void> flush_metadata() override;
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
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virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
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virtual ErrorOr<void> remove_child(StringView name) override;
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virtual ErrorOr<void> replace_child(StringView name, Inode& child) override;
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virtual ErrorOr<void> chmod(mode_t) override;
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virtual ErrorOr<void> chown(UserID, GroupID) override;
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virtual ErrorOr<void> truncate_locked(u64) override;
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virtual ErrorOr<void> update_timestamps(Optional<UnixDateTime> atime, Optional<UnixDateTime> ctime, Optional<UnixDateTime> mtime) override;
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private:
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RAMFSInode(RAMFS& fs, InodeMetadata const& metadata, LockWeakPtr<RAMFSInode> parent);
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explicit RAMFSInode(RAMFS& fs);
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static ErrorOr<NonnullRefPtr<RAMFSInode>> try_create(RAMFS&, InodeMetadata const& metadata, LockWeakPtr<RAMFSInode> parent);
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static ErrorOr<NonnullRefPtr<RAMFSInode>> try_create_root(RAMFS&);
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// ^Inode
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virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& buffer, OpenFileDescription*) override;
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ErrorOr<size_t> do_io_on_content_space(Memory::Region& mapping_region, size_t offset, size_t io_size, UserOrKernelBuffer& buffer, bool write);
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struct Child {
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NonnullOwnPtr<KString> name;
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NonnullRefPtr<RAMFSInode> inode;
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IntrusiveListNode<Child> list_node {};
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using List = IntrusiveList<&Child::list_node>;
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};
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Child* find_child_by_name(StringView);
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InodeMetadata m_metadata;
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LockWeakPtr<RAMFSInode> m_parent;
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ErrorOr<void> ensure_allocated_blocks(size_t offset, size_t io_size);
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ErrorOr<void> truncate_to_block_index(size_t block_index);
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ErrorOr<size_t> read_bytes_from_content_space(size_t offset, size_t io_size, UserOrKernelBuffer& buffer) const;
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ErrorOr<size_t> write_bytes_to_content_space(size_t offset, size_t io_size, UserOrKernelBuffer const& buffer);
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struct DataBlock {
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public:
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using List = Vector<OwnPtr<DataBlock>>;
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static ErrorOr<NonnullOwnPtr<DataBlock>> create();
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constexpr static size_t block_size = 128 * KiB;
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Memory::AnonymousVMObject& vmobject() { return *m_content_buffer_vmobject; }
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Memory::AnonymousVMObject const& vmobject() const { return *m_content_buffer_vmobject; }
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private:
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explicit DataBlock(NonnullLockRefPtr<Memory::AnonymousVMObject> content_buffer_vmobject)
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: m_content_buffer_vmobject(move(content_buffer_vmobject))
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{
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}
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NonnullLockRefPtr<Memory::AnonymousVMObject> m_content_buffer_vmobject;
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};
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bool const m_root_directory_inode { false };
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DataBlock::List m_blocks;
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Child::List m_children;
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};
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}
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