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#include "kernel/filesystem/vfs.hpp"
#include "kapi/system.hpp"
#include "kernel/devices/device.hpp"
#include "kernel/devices/storage/storage_management.hpp"
#include "kernel/filesystem/custody.hpp"
#include "kernel/filesystem/device_file.hpp"
#include "kernel/filesystem/ext2/ext2_filesystem.hpp"
#include "kernel/filesystem/inode.hpp"
#include "kernel/filesystem/inode_file.hpp"
#include "kernel/filesystem/mount.hpp"
#include "kernel/filesystem/open_file_description.hpp"
#include <kstd/memory>
#include <algorithm>
#include <optional>
#include <string_view>
namespace filesystem
{
namespace
{
constinit auto static active_vfs = std::optional<vfs>{};
} // namespace
auto vfs::init() -> void
{
if (active_vfs)
{
kapi::system::panic("[FILESYSTEM] vfs has already been initialized.");
}
active_vfs.emplace(vfs{});
auto storage_mgmt = devices::storage::storage_management::get();
if (auto boot_device = storage_mgmt.determine_boot_device())
{
active_vfs->m_root_fs = kstd::make_shared<ext2::ext2_filesystem>();
if (active_vfs->m_root_fs->mount(boot_device) != 0)
{
kapi::system::panic("[FILESYSTEM] Failed to mount root filesystem.");
}
active_vfs->m_root_mount = mount{"/", active_vfs->m_root_fs};
std::ranges::for_each(storage_mgmt.all_controllers(), [&](auto controller) {
std::ranges::for_each(controller->all_devices(), [&](auto device) { active_vfs->make_device_node(device); });
});
}
else
{
// TODO BA-FS26 ?? what when no boot_device == no modules loaded??
}
}
auto vfs::get() -> vfs &
{
if (!active_vfs)
{
kapi::system::panic("[FILESYSTEM] vfs has not been initialized.");
}
return *active_vfs;
}
auto vfs::open(std::string_view path) -> std::optional<open_file_description>
{
if (auto custody = resolve_path(path))
{
auto node = custody->get_inode();
if (node->is_device())
{
auto current_device_file = kstd::make_shared<device_file>(node->backing_device());
current_device_file->open();
return open_file_description{current_device_file};
}
auto current_inode_file = kstd::make_shared<inode_file>(node);
current_inode_file->open();
return open_file_description{current_inode_file};
}
return std::nullopt;
}
auto vfs::make_device_node(kstd::shared_ptr<devices::device> const & device) -> void
{
if (!device)
{
kapi::system::panic("[FILESYSTEM] make_device_node called with null device.");
}
m_device_nodes.push_back(device_node_entry{device->name(), kstd::make_shared<inode>(device)});
}
auto vfs::resolve_path(std::string_view path) -> std::optional<custody>
{
// TODO BA-FS26 implement real path resolution with mounts and directories etc.
// For now, just support device nodes at /dev/<device_name>.
constexpr auto device_prefix = std::string_view{"/dev/"};
if (path.starts_with(device_prefix))
{
auto const device_name = path.substr(device_prefix.size());
auto entry = std::ranges::find_if(m_device_nodes, [&](auto const & device_entry) {
return device_entry.has_value() && device_entry->name == device_name;
});
if (entry != m_device_nodes.end())
{
return custody{nullptr, entry->value().node};
}
return std::nullopt;
}
return std::nullopt;
}
} // namespace filesystem
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