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https://github.com/SerenityOS/serenity
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a6a439243f
This step would ideally not have been necessary (increases amount of refactoring and templates necessary, which in turn increases build times), but it gives us a couple of nice properties: - SpinlockProtected inside Singleton (a very common combination) can now obtain any lock rank just via the template parameter. It was not previously possible to do this with SingletonInstanceCreator magic. - SpinlockProtected's lock rank is now mandatory; this is the majority of cases and allows us to see where we're still missing proper ranks. - The type already informs us what lock rank a lock has, which aids code readability and (possibly, if gdb cooperates) lock mismatch debugging. - The rank of a lock can no longer be dynamic, which is not something we wanted in the first place (or made use of). Locks randomly changing their rank sounds like a disaster waiting to happen. - In some places, we might be able to statically check that locks are taken in the right order (with the right lock rank checking implementation) as rank information is fully statically known. This refactoring even more exposes the fact that Mutex has no lock rank capabilites, which is not fixed here.
90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/RefPtr.h>
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#include <AK/Singleton.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/Inode.h>
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namespace Kernel {
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static Singleton<SpinlockProtected<Custody::AllCustodiesList, LockRank::None>> s_all_instances;
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SpinlockProtected<Custody::AllCustodiesList, LockRank::None>& Custody::all_instances()
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{
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return s_all_instances;
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}
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ErrorOr<NonnullRefPtr<Custody>> Custody::try_create(Custody* parent, StringView name, Inode& inode, int mount_flags)
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{
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return all_instances().with([&](auto& all_custodies) -> ErrorOr<NonnullRefPtr<Custody>> {
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for (Custody& custody : all_custodies) {
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if (custody.parent() == parent
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&& custody.name() == name
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&& &custody.inode() == &inode
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&& custody.mount_flags() == mount_flags) {
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return NonnullRefPtr { custody };
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}
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}
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auto name_kstring = TRY(KString::try_create(name));
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auto custody = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) Custody(parent, move(name_kstring), inode, mount_flags)));
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all_custodies.prepend(*custody);
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return custody;
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});
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}
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Custody::Custody(Custody* parent, NonnullOwnPtr<KString> name, Inode& inode, int mount_flags)
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: m_parent(parent)
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, m_name(move(name))
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, m_inode(inode)
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, m_mount_flags(mount_flags)
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{
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}
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Custody::~Custody() = default;
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ErrorOr<NonnullOwnPtr<KString>> Custody::try_serialize_absolute_path() const
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{
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if (!parent())
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return KString::try_create("/"sv);
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Vector<Custody const*, 32> custody_chain;
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size_t path_length = 0;
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for (auto const* custody = this; custody; custody = custody->parent()) {
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TRY(custody_chain.try_append(custody));
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path_length += custody->m_name->length() + 1;
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}
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VERIFY(path_length > 0);
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char* buffer;
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auto string = TRY(KString::try_create_uninitialized(path_length - 1, buffer));
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size_t string_index = 0;
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for (size_t custody_index = custody_chain.size() - 1; custody_index > 0; --custody_index) {
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buffer[string_index] = '/';
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++string_index;
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auto const& custody_name = *custody_chain[custody_index - 1]->m_name;
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__builtin_memcpy(buffer + string_index, custody_name.characters(), custody_name.length());
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string_index += custody_name.length();
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}
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VERIFY(string->length() == string_index);
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buffer[string_index] = 0;
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return string;
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}
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bool Custody::is_readonly() const
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{
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if (m_mount_flags & MS_RDONLY)
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return true;
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return m_inode->fs().is_readonly();
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}
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}
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