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#include <drivers/ext2.hpp>
#include <drivers/disk.hpp>
#include <generic/vfs.hpp>
#include <generic/pmm.hpp>
#include <generic/hhdm.hpp>
#include <utils/assert.hpp>
#include <klibc/stdio.hpp>
#include <cstdint>
ext2_inode ext2_get_inode(ext2_partition* partition, std::uint64_t inode_num) {
char* buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
ext2_superblock* sb = partition->sb;
std::uint32_t group = (inode_num - 1) / sb->s_inodes_per_group;
std::uint32_t index = (inode_num - 1) % sb->s_inodes_per_group;
std::uint32_t bgdt_block = (sb->s_log_block_size == 0) ? 2 : 1;
std::uint32_t block_size = 1024 << sb->s_log_block_size;
bytes_to_block_res result = bytes_to_blocks(block_size * bgdt_block, block_size, partition->target_disk->lba_size);
partition->target_disk->read(partition->target_disk->arg, buffer, result.lba, result.size_in_blocks);
struct ext2_group_desc *gd = (struct ext2_group_desc *)((std::uint64_t)buffer + group);
uint32_t inode_size = 128;
uint32_t byte_offset = index * inode_size;
uint32_t block_in_table = gd->bg_inode_table + (byte_offset / block_size);
uint32_t internal_offset = byte_offset % block_size;
result = bytes_to_blocks(block_size * block_in_table, block_size, partition->target_disk->lba_size);
char* inode_buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
partition->target_disk->read(partition->target_disk->arg, inode_buffer, result.lba, result.size_in_blocks);
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
return *(struct ext2_inode*)((std::uint64_t)inode_buffer + internal_offset);
}
void drivers::ext2::init(disk* target_disk, std::uint64_t lba_start) {
bytes_to_block_res b = bytes_to_blocks(1024, 1024, target_disk->lba_size);
char* buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
target_disk->read(target_disk->arg, buffer, lba_start + b.lba, b.size_in_blocks);
ext2_superblock *sb = (ext2_superblock*)buffer;
assert(sb->s_magic == EXT2_MAGIC,"its not ext2 partition !");
}
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