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https://github.com/SerenityOS/serenity
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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.
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2022-2024, 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 <Kernel/FileSystem/RAMBackedFileType.h>
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#include <Kernel/FileSystem/RAMFS/FileSystem.h>
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#include <Kernel/FileSystem/RAMFS/Inode.h>
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namespace Kernel {
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ErrorOr<NonnullRefPtr<FileSystem>> RAMFS::try_create(FileSystemSpecificOptions const&)
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{
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return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) RAMFS));
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}
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RAMFS::RAMFS() = default;
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RAMFS::~RAMFS() = default;
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ErrorOr<void> RAMFS::initialize()
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{
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m_root_inode = TRY(RAMFSInode::try_create_root(*this));
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return {};
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}
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Inode& RAMFS::root_inode()
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{
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VERIFY(!m_root_inode.is_null());
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return *m_root_inode;
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}
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ErrorOr<void> RAMFS::rename(Inode& old_parent_inode, StringView old_basename, Inode& new_parent_inode, StringView new_basename)
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{
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MutexLocker locker(m_lock);
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if (auto maybe_inode_to_be_replaced = new_parent_inode.lookup(new_basename); !maybe_inode_to_be_replaced.is_error()) {
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VERIFY(!maybe_inode_to_be_replaced.value()->is_directory());
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TRY(new_parent_inode.remove_child(new_basename));
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}
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auto old_inode = TRY(old_parent_inode.lookup(old_basename));
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TRY(new_parent_inode.add_child(old_inode, new_basename, old_inode->mode()));
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TRY(old_parent_inode.remove_child(old_basename));
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return {};
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}
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unsigned RAMFS::next_inode_index()
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{
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MutexLocker locker(m_lock);
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return m_next_inode_index++;
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}
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u8 RAMFS::internal_file_type_to_directory_entry_type(DirectoryEntryView const& entry) const
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{
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return ram_backed_file_type_to_directory_entry_type(entry);
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}
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}
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