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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Singleton.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <Kernel/FileSystem/DevPtsFS.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/TTY/SlavePTY.h>
namespace Kernel {
NonnullRefPtr<DevPtsFS> DevPtsFS::create()
{
return adopt_ref(*new DevPtsFS);
}
DevPtsFS::DevPtsFS()
{
}
DevPtsFS::~DevPtsFS()
{
}
static AK::Singleton<HashTable<unsigned>> s_ptys;
bool DevPtsFS::initialize()
{
m_root_inode = adopt_ref(*new DevPtsFSInode(*this, 1, nullptr));
m_root_inode->m_metadata.inode = { fsid(), 1 };
m_root_inode->m_metadata.mode = 0040555;
m_root_inode->m_metadata.uid = 0;
m_root_inode->m_metadata.gid = 0;
m_root_inode->m_metadata.size = 0;
m_root_inode->m_metadata.mtime = mepoch;
return true;
}
static unsigned inode_index_to_pty_index(InodeIndex inode_index)
{
VERIFY(inode_index > 1);
return inode_index.value() - 2;
}
static InodeIndex pty_index_to_inode_index(unsigned pty_index)
{
return pty_index + 2;
}
NonnullRefPtr<Inode> DevPtsFS::root_inode() const
{
return *m_root_inode;
}
RefPtr<Inode> DevPtsFS::get_inode(InodeIdentifier inode_id) const
{
if (inode_id.index() == 1)
return m_root_inode;
unsigned pty_index = inode_index_to_pty_index(inode_id.index());
auto* device = Device::get_device(201, pty_index);
VERIFY(device);
auto inode = adopt_ref(*new DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index(), static_cast<SlavePTY*>(device)));
inode->m_metadata.inode = inode_id;
inode->m_metadata.size = 0;
inode->m_metadata.uid = device->uid();
inode->m_metadata.gid = device->gid();
inode->m_metadata.mode = 0020600;
inode->m_metadata.major_device = device->major();
inode->m_metadata.minor_device = device->minor();
inode->m_metadata.mtime = mepoch;
return inode;
}
void DevPtsFS::register_slave_pty(SlavePTY& slave_pty)
{
s_ptys->set(slave_pty.index());
}
void DevPtsFS::unregister_slave_pty(SlavePTY& slave_pty)
{
s_ptys->remove(slave_pty.index());
}
DevPtsFSInode::DevPtsFSInode(DevPtsFS& fs, InodeIndex index, SlavePTY* pty)
: Inode(fs, index)
{
if (pty)
m_pty = *pty;
}
DevPtsFSInode::~DevPtsFSInode()
{
}
KResultOr<ssize_t> DevPtsFSInode::read_bytes(off_t, ssize_t, UserOrKernelBuffer&, FileDescription*) const
{
VERIFY_NOT_REACHED();
}
KResultOr<ssize_t> DevPtsFSInode::write_bytes(off_t, ssize_t, const UserOrKernelBuffer&, FileDescription*)
{
VERIFY_NOT_REACHED();
}
InodeMetadata DevPtsFSInode::metadata() const
{
if (auto pty = m_pty.strong_ref()) {
auto metadata = m_metadata;
metadata.mtime = pty->time_of_last_write();
return metadata;
}
return m_metadata;
}
KResult DevPtsFSInode::traverse_as_directory(Function<bool(const FS::DirectoryEntryView&)> callback) const
{
if (identifier().index() > 1)
return ENOTDIR;
callback({ ".", identifier(), 0 });
callback({ "..", identifier(), 0 });
for (unsigned pty_index : *s_ptys) {
String name = String::number(pty_index);
InodeIdentifier identifier = { fsid(), pty_index_to_inode_index(pty_index) };
callback({ name, identifier, 0 });
}
return KSuccess;
}
KResultOr<size_t> DevPtsFSInode::directory_entry_count() const
{
VERIFY(identifier().index() == 1);
return 2 + s_ptys->size();
}
RefPtr<Inode> DevPtsFSInode::lookup(StringView name)
{
VERIFY(identifier().index() == 1);
if (name == "." || name == "..")
return this;
auto& fs = static_cast<DevPtsFS&>(this->fs());
auto pty_index = name.to_uint();
if (pty_index.has_value() && s_ptys->contains(pty_index.value())) {
return fs.get_inode({ fsid(), pty_index_to_inode_index(pty_index.value()) });
}
return {};
}
void DevPtsFSInode::flush_metadata()
{
}
KResult DevPtsFSInode::add_child(Inode&, const StringView&, mode_t)
{
return EROFS;
}
KResultOr<NonnullRefPtr<Inode>> DevPtsFSInode::create_child(const String&, mode_t, dev_t, uid_t, gid_t)
{
return EROFS;
}
KResult DevPtsFSInode::remove_child(const StringView&)
{
return EROFS;
}
KResult DevPtsFSInode::chmod(mode_t)
{
return EROFS;
}
KResult DevPtsFSInode::chown(uid_t, gid_t)
{
return EROFS;
}
}
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