mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-12 01:47:00 +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.
120 lines
3.0 KiB
C++
120 lines
3.0 KiB
C++
/*
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* Copyright (c) 2024, 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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#include <AK/StringView.h>
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#include <Kernel/Devices/Device.h>
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#include <Kernel/Devices/Loop/LoopDevice.h>
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#include <Kernel/FileSystem/DevLoopFS/Inode.h>
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#include <Kernel/FileSystem/RAMBackedFileType.h>
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namespace Kernel {
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static InodeIndex loop_index_to_inode_index(unsigned loop_index)
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{
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return loop_index + 2;
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}
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DevLoopFSInode::DevLoopFSInode(DevLoopFS& fs, InodeIndex index, LoopDevice& loop_device)
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: Inode(fs, index)
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, m_loop_device(loop_device)
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{
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}
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// NOTE: This constructor is used for the root inode only.
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DevLoopFSInode::DevLoopFSInode(DevLoopFS& fs)
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: Inode(fs, 1)
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{
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}
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DevLoopFSInode::~DevLoopFSInode() = default;
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ErrorOr<size_t> DevLoopFSInode::read_bytes_locked(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const
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{
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VERIFY_NOT_REACHED();
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}
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ErrorOr<size_t> DevLoopFSInode::write_bytes_locked(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*)
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{
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VERIFY_NOT_REACHED();
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}
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InodeMetadata DevLoopFSInode::metadata() const
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{
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return m_metadata;
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}
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ErrorOr<void> DevLoopFSInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
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{
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if (identifier().index() > 1)
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return ENOTDIR;
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TRY(callback({ "."sv, identifier(), to_underlying(RAMBackedFileType::Directory) }));
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TRY(callback({ ".."sv, identifier(), to_underlying(RAMBackedFileType::Directory) }));
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return LoopDevice::all_instances().with([&](auto& list) -> ErrorOr<void> {
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StringBuilder builder;
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for (LoopDevice& loop_device : list) {
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builder.clear();
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TRY(builder.try_appendff("{}", loop_device.index()));
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TRY(callback({ builder.string_view(), { fsid(), loop_index_to_inode_index(loop_device.index()) }, to_underlying(RAMBackedFileType::Block) }));
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}
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return {};
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});
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}
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ErrorOr<NonnullRefPtr<Inode>> DevLoopFSInode::lookup(StringView name)
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{
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VERIFY(identifier().index() == 1);
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if (name == "." || name == "..")
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return *this;
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auto loop_index = name.to_number<unsigned>();
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if (!loop_index.has_value())
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return ENOENT;
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return LoopDevice::all_instances().with([&](auto& list) -> ErrorOr<NonnullRefPtr<Inode>> {
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for (LoopDevice& loop_device : list) {
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if (loop_device.index() != loop_index.value())
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continue;
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return fs().get_inode({ fsid(), loop_index_to_inode_index(loop_index.value()) });
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}
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return ENOENT;
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});
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}
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ErrorOr<void> DevLoopFSInode::flush_metadata()
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{
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return {};
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}
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ErrorOr<void> DevLoopFSInode::add_child(Inode&, StringView, mode_t)
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{
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return EROFS;
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}
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ErrorOr<NonnullRefPtr<Inode>> DevLoopFSInode::create_child(StringView, mode_t, dev_t, UserID, GroupID)
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{
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return EROFS;
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}
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ErrorOr<void> DevLoopFSInode::remove_child(StringView)
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{
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return EROFS;
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}
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ErrorOr<void> DevLoopFSInode::chmod(mode_t)
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{
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return EROFS;
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}
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ErrorOr<void> DevLoopFSInode::chown(UserID, GroupID)
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{
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return EROFS;
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}
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}
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