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#include "kernel/filesystem/ext2/filesystem.hpp"
#include "kapi/devices/device.hpp"
#include "kernel/devices/block_device_utils.hpp"
#include "kernel/filesystem/ext2/inode.hpp"
#include "kernel/filesystem/ext2/superblock.hpp"
#include "kernel/filesystem/inode.hpp"
#include <kstd/memory>
#include <cstddef>
#include <cstdint>
#include <string_view>
namespace kernel::filesystem::ext2
{
namespace
{
constexpr size_t SUPERBLOCK_OFFSET = 1024;
constexpr uint16_t EXT2_MAGIC = 0xEF53;
// Mode bits
constexpr uint16_t S_IFMT = 0xF000;
constexpr uint16_t S_IFREG = 0x8000;
constexpr uint16_t S_IFDIR = 0x4000;
auto S_ISREG(uint16_t mode) -> bool
{
return (mode & S_IFMT) == S_IFREG;
}
auto S_ISDIR(uint16_t mode) -> bool
{
return (mode & S_IFMT) == S_IFDIR;
}
} // namespace
auto filesystem::mount(kstd::shared_ptr<kapi::devices::device> const & device) -> int
{
m_device = device;
kernel::devices::block_device_utils::read(m_device, &m_superblock, SUPERBLOCK_OFFSET, sizeof(m_superblock));
if (m_superblock.magic != EXT2_MAGIC)
{
return -1;
}
// TODO BA-FS26 load proper root inode from ext2 metadata
// m_root_inode = inode{inode_kind::directory};
// TODO BA-FS26 implement
m_root_inode = kstd::make_shared<inode>();
// devices::block_device_utils::read(device, nullptr, 0, 0); // TODO BA-FS26 just for testing
return 0;
}
auto filesystem::lookup(kstd::shared_ptr<kernel::filesystem::inode> const & /*parent*/, std::string_view name)
-> kstd::shared_ptr<kernel::filesystem::inode>
{
// TODO BA-FS26 implement ext2 directory traversal and inode loading
if (name == "dev")
{
// TODO BA-FS26 just for testing
return nullptr;
}
return kstd::make_shared<inode>();
}
auto filesystem::get_block_size() -> size_t
{
return 1024U << m_superblock.log_block_size;
}
auto filesystem::get_inode_size() -> size_t
{
return m_superblock.rev_level == 0 ? 128 : m_superblock.inode_size;
}
} // namespace kernel::filesystem::ext2
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