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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.
*/
#pragma once
#include <AK/Badge.h>
#include <AK/Function.h>
#include <AK/HashMap.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/RefPtr.h>
#include <AK/String.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/InodeIdentifier.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/KResult.h>
#include <Kernel/UnveilNode.h>
namespace Kernel {
class Custody;
class Device;
class FileDescription;
struct UidAndGid {
uid_t uid;
gid_t gid;
};
class VFS {
AK_MAKE_ETERNAL
public:
class Mount {
public:
Mount(FS&, Custody* host_custody, int flags);
Mount(Inode& source, Custody& host_custody, int flags);
const Inode* host() const;
Inode* host();
const Inode& guest() const { return *m_guest; }
Inode& guest() { return *m_guest; }
const FS& guest_fs() const { return *m_guest_fs; }
String absolute_path() const;
int flags() const { return m_flags; }
void set_flags(int flags) { m_flags = flags; }
private:
NonnullRefPtr<Inode> m_guest;
NonnullRefPtr<FS> m_guest_fs;
RefPtr<Custody> m_host_custody;
int m_flags;
};
static void initialize();
static VFS& the();
VFS();
~VFS();
bool mount_root(FS&);
KResult mount(FS&, Custody& mount_point, int flags);
KResult bind_mount(Custody& source, Custody& mount_point, int flags);
KResult remount(Custody& mount_point, int new_flags);
KResult unmount(Inode& guest_inode);
KResultOr<NonnullRefPtr<FileDescription>> open(StringView path, int options, mode_t mode, Custody& base, Optional<UidAndGid> = {});
KResultOr<NonnullRefPtr<FileDescription>> create(StringView path, int options, mode_t mode, Custody& parent_custody, Optional<UidAndGid> = {});
KResult mkdir(StringView path, mode_t mode, Custody& base);
KResult link(StringView old_path, StringView new_path, Custody& base);
KResult unlink(StringView path, Custody& base);
KResult symlink(StringView target, StringView linkpath, Custody& base);
KResult rmdir(StringView path, Custody& base);
KResult chmod(StringView path, mode_t, Custody& base);
KResult chmod(Custody&, mode_t);
KResult chown(StringView path, uid_t, gid_t, Custody& base);
KResult chown(Custody&, uid_t, gid_t);
KResult access(StringView path, int mode, Custody& base);
KResultOr<InodeMetadata> lookup_metadata(StringView path, Custody& base, int options = 0);
KResult utime(StringView path, Custody& base, time_t atime, time_t mtime);
KResult rename(StringView oldpath, StringView newpath, Custody& base);
KResult mknod(StringView path, mode_t, dev_t, Custody& base);
KResultOr<NonnullRefPtr<Custody>> open_directory(StringView path, Custody& base);
size_t mount_count() const { return m_mounts.size(); }
void for_each_mount(Function<void(const Mount&)>) const;
InodeIdentifier root_inode_id() const;
void sync();
Custody& root_custody();
KResultOr<NonnullRefPtr<Custody>> resolve_path(StringView path, Custody& base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
KResultOr<NonnullRefPtr<Custody>> resolve_path_without_veil(StringView path, Custody& base, RefPtr<Custody>* out_parent = nullptr, int options = 0, int symlink_recursion_level = 0);
private:
friend class FileDescription;
const UnveilNode* find_matching_unveiled_path(StringView path);
KResult validate_path_against_process_veil(StringView path, int options);
bool is_vfs_root(InodeIdentifier) const;
KResult traverse_directory_inode(Inode&, Function<bool(const FS::DirectoryEntryView&)>);
Mount* find_mount_for_host(Inode&);
Mount* find_mount_for_host(InodeIdentifier);
Mount* find_mount_for_guest(Inode&);
Mount* find_mount_for_guest(InodeIdentifier);
Lock m_lock { "VFSLock" };
RefPtr<Inode> m_root_inode;
Vector<Mount, 16> m_mounts;
RefPtr<Custody> m_root_custody;
};
}
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