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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/HashTable.h>
#include <AK/StringBuilder.h>
#include <AK/Vector.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/Lock.h>
namespace Kernel {
static Lockable<InlineLinkedList<Custody>>& all_custodies()
{
static Lockable<InlineLinkedList<Custody>>* list;
if (!list)
list = new Lockable<InlineLinkedList<Custody>>;
return *list;
}
Custody* Custody::get_if_cached(Custody* parent, const StringView& name)
{
LOCKER(all_custodies().lock());
for (auto& custody : all_custodies().resource()) {
if (custody.is_deleted())
continue;
if (custody.is_mounted_on())
continue;
if (custody.parent() == parent && custody.name() == name)
return &custody;
}
return nullptr;
}
NonnullRefPtr<Custody> Custody::get_or_create(Custody* parent, const StringView& name, Inode& inode, int mount_flags)
{
if (RefPtr<Custody> cached_custody = get_if_cached(parent, name)) {
if (&cached_custody->inode() != &inode) {
dbg() << "WTF! Cached custody for name '" << name << "' has inode=" << cached_custody->inode().identifier() << ", new inode=" << inode.identifier();
}
ASSERT(&cached_custody->inode() == &inode);
return *cached_custody;
}
return create(parent, name, inode, mount_flags);
}
Custody::Custody(Custody* parent, const StringView& name, Inode& inode, int mount_flags)
: m_parent(parent)
, m_name(name)
, m_inode(inode)
, m_mount_flags(mount_flags)
{
LOCKER(all_custodies().lock());
all_custodies().resource().append(this);
}
Custody::~Custody()
{
LOCKER(all_custodies().lock());
all_custodies().resource().remove(this);
}
String Custody::absolute_path() const
{
if (!parent())
return "/";
Vector<const Custody*, 32> custody_chain;
for (auto* custody = this; custody; custody = custody->parent())
custody_chain.append(custody);
StringBuilder builder;
for (int i = custody_chain.size() - 2; i >= 0; --i) {
builder.append('/');
builder.append(custody_chain[i]->name().characters());
}
return builder.to_string();
}
void Custody::did_delete(Badge<VFS>)
{
m_deleted = true;
}
void Custody::did_mount_on(Badge<VFS>)
{
m_mounted_on = true;
}
void Custody::did_rename(Badge<VFS>, const String& name)
{
m_name = name;
}
}
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