mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-11 17:37:00 +02:00
0e94887b2c
Previously, the VFS layer would try to handle renames more-or-less by itself, which really only worked for ext2, and even that was only due to the replace_child kludge existing specifically for this purpose. This never worked properly for FATFS, since the VFS layer effectively depended on filesystems having some kind of reference-counting for inodes, which is something that simply doesn't exist on any FAT variant we support. To resolve various issues with the existing scheme, this commit makes filesystem implementations themselves responsible for the actual rename operation, while keeping all the existing validation inside the VFS layer. The only intended behavior change here is that rename operations should actually properly work on FATFS.
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> 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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