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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@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.
*/
#pragma once
#include <AK/HashMap.h>
#include <AK/Optional.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/KBuffer.h>
namespace Kernel {
class TmpFSInode;
class TmpFS final : public FS {
friend class TmpFSInode;
public:
virtual ~TmpFS() override;
static NonnullRefPtr<TmpFS> create();
virtual bool initialize() override;
virtual const char* class_name() const override { return "TmpFS"; }
virtual bool supports_watchers() const override { return true; }
virtual NonnullRefPtr<Inode> root_inode() const override;
private:
TmpFS();
RefPtr<TmpFSInode> m_root_inode;
HashMap<unsigned, NonnullRefPtr<TmpFSInode>> m_inodes;
RefPtr<Inode> get_inode(InodeIdentifier identifier) const;
void register_inode(TmpFSInode&);
void unregister_inode(InodeIdentifier);
unsigned m_next_inode_index { 1 };
unsigned next_inode_index();
};
class TmpFSInode final : public Inode {
friend class TmpFS;
public:
virtual ~TmpFSInode() override;
TmpFS& fs() { return static_cast<TmpFS&>(Inode::fs()); }
const TmpFS& fs() const { return static_cast<const TmpFS&>(Inode::fs()); }
// ^Inode
virtual ssize_t read_bytes(off_t, ssize_t, UserOrKernelBuffer& buffer, FileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual KResult traverse_as_directory(Function<bool(const FS::DirectoryEntryView&)>) const override;
virtual RefPtr<Inode> lookup(StringView name) override;
virtual void flush_metadata() override;
virtual ssize_t write_bytes(off_t, ssize_t, const UserOrKernelBuffer& buffer, FileDescription*) override;
virtual KResultOr<NonnullRefPtr<Inode>> create_child(const String& name, mode_t, dev_t, uid_t, gid_t) override;
virtual KResult add_child(Inode&, const StringView& name, mode_t) override;
virtual KResult remove_child(const StringView& name) override;
virtual KResultOr<size_t> directory_entry_count() const override;
virtual KResult chmod(mode_t) override;
virtual KResult chown(uid_t, gid_t) override;
virtual KResult truncate(u64) override;
virtual int set_atime(time_t) override;
virtual int set_ctime(time_t) override;
virtual int set_mtime(time_t) override;
virtual void one_ref_left() override;
private:
TmpFSInode(TmpFS& fs, InodeMetadata metadata, InodeIdentifier parent);
static NonnullRefPtr<TmpFSInode> create(TmpFS&, InodeMetadata metadata, InodeIdentifier parent);
static NonnullRefPtr<TmpFSInode> create_root(TmpFS&);
void notify_watchers();
InodeMetadata m_metadata;
InodeIdentifier m_parent;
OwnPtr<KBuffer> m_content;
struct Child {
String name;
NonnullRefPtr<TmpFSInode> inode;
};
HashMap<String, Child> m_children;
};
}
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