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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/FileSystem/DevPtsFS.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/TTY/SlavePTY.h>
namespace Kernel {
ErrorOr<NonnullRefPtr<DevPtsFS>> DevPtsFS::try_create()
{
return adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFS);
}
DevPtsFS::DevPtsFS() = default;
DevPtsFS::~DevPtsFS() = default;
ErrorOr<void> DevPtsFS::initialize()
{
m_root_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) 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 {};
}
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;
}
Inode& DevPtsFS::root_inode()
{
return *m_root_inode;
}
ErrorOr<NonnullRefPtr<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 = DeviceManagement::the().get_device(201, pty_index);
VERIFY(device);
auto inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) 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;
}
DevPtsFSInode::DevPtsFSInode(DevPtsFS& fs, InodeIndex index, SlavePTY* pty)
: Inode(fs, index)
{
if (pty)
m_pty = *pty;
}
DevPtsFSInode::~DevPtsFSInode() = default;
ErrorOr<size_t> DevPtsFSInode::read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const
{
VERIFY_NOT_REACHED();
}
ErrorOr<size_t> DevPtsFSInode::write_bytes(off_t, size_t, const UserOrKernelBuffer&, OpenFileDescription*)
{
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;
}
ErrorOr<void> DevPtsFSInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
{
if (identifier().index() > 1)
return ENOTDIR;
TRY(callback({ ".", identifier(), 0 }));
TRY(callback({ "..", identifier(), 0 }));
return SlavePTY::all_instances().with([&](auto& list) -> ErrorOr<void> {
StringBuilder builder;
for (SlavePTY& slave_pty : list) {
builder.clear();
TRY(builder.try_appendff("{}", slave_pty.index()));
TRY(callback({ builder.string_view(), { fsid(), pty_index_to_inode_index(slave_pty.index()) }, 0 }));
}
return {};
});
}
ErrorOr<NonnullRefPtr<Inode>> DevPtsFSInode::lookup(StringView name)
{
VERIFY(identifier().index() == 1);
if (name == "." || name == "..")
return *this;
auto pty_index = name.to_uint();
if (!pty_index.has_value())
return ENOENT;
return SlavePTY::all_instances().with([&](auto& list) -> ErrorOr<NonnullRefPtr<Inode>> {
for (SlavePTY& slave_pty : list) {
if (slave_pty.index() != pty_index.value())
continue;
return fs().get_inode({ fsid(), pty_index_to_inode_index(pty_index.value()) });
}
return ENOENT;
});
}
ErrorOr<void> DevPtsFSInode::flush_metadata()
{
return {};
}
ErrorOr<void> DevPtsFSInode::add_child(Inode&, StringView, mode_t)
{
return EROFS;
}
ErrorOr<NonnullRefPtr<Inode>> DevPtsFSInode::create_child(StringView, mode_t, dev_t, UserID, GroupID)
{
return EROFS;
}
ErrorOr<void> DevPtsFSInode::remove_child(StringView)
{
return EROFS;
}
ErrorOr<void> DevPtsFSInode::chmod(mode_t)
{
return EROFS;
}
ErrorOr<void> DevPtsFSInode::chown(UserID, GroupID)
{
return EROFS;
}
}
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