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#pragma once
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
#include <AK/RetainPtr.h>
#include <AK/AKString.h>
#include <AK/Vector.h>
#include <AK/Function.h>
#include "InodeIdentifier.h"
#include "InodeMetadata.h"
#include "FileSystem.h"
#include <Kernel/KResult.h>
#define O_RDONLY 0
#define O_WRONLY 1
#define O_RDWR 2
#define O_CREAT 0100
#define O_EXCL 0200
#define O_NOCTTY 0400
#define O_TRUNC 01000
#define O_APPEND 02000
#define O_NONBLOCK 04000
#define O_DIRECTORY 00200000
#define O_NOFOLLOW 00400000
#define O_CLOEXEC 02000000
#define O_NOFOLLOW_NOERROR 0x4000000
class Device;
class FileDescriptor;
inline constexpr dword encoded_device(unsigned major, unsigned minor)
{
return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
}
class VFS;
class VFS {
AK_MAKE_ETERNAL
public:
class Mount {
public:
Mount(InodeIdentifier host, RetainPtr<FS>&&);
InodeIdentifier host() const { return m_host; }
InodeIdentifier guest() const { return m_guest; }
const FS& guest_fs() const { return *m_guest_fs; }
private:
InodeIdentifier m_host;
InodeIdentifier m_guest;
RetainPtr<FS> m_guest_fs;
};
[[gnu::pure]] static VFS& the();
VFS();
~VFS();
bool mount_root(RetainPtr<FS>&&);
bool mount(RetainPtr<FS>&&, StringView path);
KResultOr<Retained<FileDescriptor>> open(RetainPtr<Device>&&, int options);
KResultOr<Retained<FileDescriptor>> open(StringView path, int options, mode_t mode, Inode& base);
KResultOr<Retained<FileDescriptor>> create(StringView path, int options, mode_t mode, Inode& base);
KResult mkdir(StringView path, mode_t mode, Inode& base);
KResult link(StringView old_path, StringView new_path, Inode& base);
KResult unlink(StringView path, Inode& base);
KResult symlink(StringView target, StringView linkpath, Inode& base);
KResult rmdir(StringView path, Inode& base);
KResult chmod(StringView path, mode_t, Inode& base);
KResult chmod(Inode&, mode_t);
KResult chown(StringView path, uid_t, gid_t, Inode& base);
KResult access(StringView path, int mode, Inode& base);
KResult stat(StringView path, int options, Inode& base, struct stat&);
KResult utime(StringView path, Inode& base, time_t atime, time_t mtime);
KResult rename(StringView oldpath, StringView newpath, Inode& base);
KResultOr<Retained<Inode>> open_directory(StringView path, Inode& base);
void register_device(Device&);
void unregister_device(Device&);
size_t mount_count() const { return m_mounts.size(); }
void for_each_mount(Function<void(const Mount&)>) const;
KResultOr<String> absolute_path(Inode&);
KResultOr<String> absolute_path(InodeIdentifier);
InodeIdentifier root_inode_id() const;
Inode* root_inode() { return m_root_inode.ptr(); }
const Inode* root_inode() const { return m_root_inode.ptr(); }
void sync();
Device* get_device(unsigned major, unsigned minor);
private:
friend class FileDescriptor;
RetainPtr<Inode> get_inode(InodeIdentifier);
bool is_vfs_root(InodeIdentifier) const;
void traverse_directory_inode(Inode&, Function<bool(const FS::DirectoryEntry&)>);
InodeIdentifier old_resolve_path(StringView path, InodeIdentifier base, int& error, int options = 0, InodeIdentifier* parent_id = nullptr);
KResultOr<InodeIdentifier> resolve_path(StringView path, InodeIdentifier base, int options = 0, InodeIdentifier* parent_id = nullptr);
KResultOr<Retained<Inode>> resolve_path_to_inode(StringView path, Inode& base, RetainPtr<Inode>* parent_id = nullptr, int options = 0);
KResultOr<InodeIdentifier> resolve_symbolic_link(InodeIdentifier base, Inode& symlink_inode);
Mount* find_mount_for_host(InodeIdentifier);
Mount* find_mount_for_guest(InodeIdentifier);
RetainPtr<Inode> m_root_inode;
Vector<OwnPtr<Mount>> m_mounts;
HashMap<dword, Device*> m_devices;
};
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