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c70e2f2519
We don't need to access the Custody cache in IRQs or anything like that, so it should be fine to use a regular Mutex (via ProtectedValue.) This allows threads to block while waiting for the custody cache. Thanks to Sergey for pointing this out. :^)
128 lines
3.5 KiB
C++
128 lines
3.5 KiB
C++
/*
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* Copyright (c) 2018-2020, 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/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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#include <Kernel/Locking/ProtectedValue.h>
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namespace Kernel {
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static Singleton<ProtectedValue<Custody::AllCustodiesList>> s_all_custodies;
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static ProtectedValue<Custody::AllCustodiesList>& all_custodies()
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{
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return s_all_custodies;
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}
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KResultOr<NonnullRefPtr<Custody>> Custody::try_create(Custody* parent, StringView name, Inode& inode, int mount_flags)
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{
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return all_custodies().with_exclusive([&](auto& all_custodies) -> KResultOr<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 custody;
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}
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}
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auto name_kstring = KString::try_create(name);
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if (!name_kstring)
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return ENOMEM;
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auto custody = adopt_ref_if_nonnull(new (nothrow) Custody(parent, name_kstring.release_nonnull(), inode, mount_flags));
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if (!custody)
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return ENOMEM;
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all_custodies.prepend(*custody);
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return custody.release_nonnull();
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});
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}
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bool Custody::unref() const
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{
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bool should_destroy = all_custodies().with_exclusive([&](auto&) {
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if (deref_base())
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return false;
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m_all_custodies_list_node.remove();
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return true;
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});
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if (should_destroy)
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delete this;
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return should_destroy;
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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()
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{
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}
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OwnPtr<KString> Custody::try_create_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* custody = this; custody; custody = custody->parent()) {
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custody_chain.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 = KString::try_create_uninitialized(path_length - 1, buffer);
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if (!string)
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return string;
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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& 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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String Custody::absolute_path() const
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{
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if (!parent())
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return "/";
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Vector<Custody const*, 32> custody_chain;
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for (auto* custody = this; custody; custody = custody->parent())
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custody_chain.append(custody);
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StringBuilder builder;
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for (int i = custody_chain.size() - 2; i >= 0; --i) {
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builder.append('/');
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builder.append(custody_chain[i]->name());
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}
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return builder.to_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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