mirror of
https://github.com/SerenityOS/serenity.git
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116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/HashTable.h>
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#include <AK/StringBuilder.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/Lock.h>
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namespace Kernel {
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static Lockable<InlineLinkedList<Custody>>& all_custodies()
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{
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static Lockable<InlineLinkedList<Custody>>* list;
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if (!list)
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list = new Lockable<InlineLinkedList<Custody>>;
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return *list;
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}
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Custody* Custody::get_if_cached(Custody* parent, const StringView& name)
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{
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LOCKER(all_custodies().lock());
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for (auto& custody : all_custodies().resource()) {
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if (custody.is_deleted())
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continue;
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if (custody.is_mounted_on())
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continue;
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if (custody.parent() == parent && custody.name() == name)
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return &custody;
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}
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return nullptr;
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}
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NonnullRefPtr<Custody> Custody::get_or_create(Custody* parent, const StringView& name, Inode& inode, int mount_flags)
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{
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if (RefPtr<Custody> cached_custody = get_if_cached(parent, name)) {
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if (&cached_custody->inode() != &inode) {
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dbg() << "WTF! Cached custody for name '" << name << "' has inode=" << cached_custody->inode().identifier() << ", new inode=" << inode.identifier();
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}
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ASSERT(&cached_custody->inode() == &inode);
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return *cached_custody;
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}
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return create(parent, name, inode, mount_flags);
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}
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Custody::Custody(Custody* parent, const StringView& name, Inode& inode, int mount_flags)
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: m_parent(parent)
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, m_name(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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LOCKER(all_custodies().lock());
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all_custodies().resource().append(this);
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}
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Custody::~Custody()
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{
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LOCKER(all_custodies().lock());
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all_custodies().resource().remove(this);
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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<const Custody*, 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().characters());
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}
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return builder.to_string();
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}
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void Custody::did_delete(Badge<VFS>)
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{
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m_deleted = true;
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}
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void Custody::did_mount_on(Badge<VFS>)
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{
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m_mounted_on = true;
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}
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void Custody::did_rename(Badge<VFS>, const String& name)
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{
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m_name = name;
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}
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}
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