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#include "kernel/filesystem/ext2/inode.hpp"
#include "kapi/system.hpp"
#include "kernel/devices/block_device_utils.hpp"
#include "kernel/filesystem/ext2/filesystem.hpp"
#include "kernel/filesystem/inode.hpp"
#include <algorithm>
#include <cstddef>
#include <cstdint>
namespace kernel::filesystem::ext2
{
inode::inode(filesystem * fs)
: kernel::filesystem::inode(inode_kind::regular)
, m_filesystem(fs)
{
if (!m_filesystem)
{
kapi::system::panic("[EXT2] ext2::inode constructed with filesystem null pointer");
}
}
auto inode::read(void * buffer, size_t offset, size_t size) const -> size_t
{
auto block_index = offset / m_filesystem->get_block_size();
auto in_block_offset = offset % m_filesystem->get_block_size();
auto bytes_read = 0uz;
while (bytes_read < size)
{
auto const block_number = m_filesystem->map_inode_block_index_to_global_block_number(block_index, m_data);
if (block_number == 0) // TODO BA-FS26 really correct?
{
break;
}
auto const block_start_offset = block_number * m_filesystem->get_block_size();
auto const read_offset = block_start_offset + in_block_offset;
auto const bytes_to_read = std::min(size - bytes_read, m_filesystem->get_block_size() - in_block_offset);
bytes_read += kernel::devices::block_device_utils::read(
m_filesystem->device(), static_cast<uint8_t *>(buffer) + bytes_read, read_offset, bytes_to_read);
block_index++;
in_block_offset = 0; // After the first block, we always start at the beginning of the block
}
return bytes_read;
}
auto inode::write(void const * /*buffer*/, size_t /*offset*/, size_t /*size*/) -> size_t
{
kapi::system::panic("[EXT2] inode::write is not implemented yet");
return 0;
}
} // namespace kernel::filesystem::ext2
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