From 16b854e991bb791694268d09eb696c719cdff42f Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Thu, 2 Apr 2026 11:09:13 +0200
Subject: read block_group_descriptors

---
 kernel/include/kernel/filesystem/ext2/filesystem.hpp |  3 +++
 kernel/src/filesystem/ext2/filesystem.cpp            | 13 +++++++++++++
 2 files changed, 16 insertions(+)

(limited to 'kernel')

diff --git a/kernel/include/kernel/filesystem/ext2/filesystem.hpp b/kernel/include/kernel/filesystem/ext2/filesystem.hpp
index f6cd17f..59b9cba 100644
--- a/kernel/include/kernel/filesystem/ext2/filesystem.hpp
+++ b/kernel/include/kernel/filesystem/ext2/filesystem.hpp
@@ -3,11 +3,13 @@
 
 #include "kapi/devices/device.hpp"
 
+#include "kernel/filesystem/ext2/block_group_descriptor.hpp"
 #include "kernel/filesystem/ext2/superblock.hpp"
 #include "kernel/filesystem/filesystem.hpp"
 #include "kernel/filesystem/inode.hpp"
 
 #include <kstd/memory>
+#include <kstd/vector>
 
 #include <cstddef>
 #include <string_view>
@@ -25,6 +27,7 @@ namespace kernel::filesystem::ext2
     auto get_inode_size() -> size_t;
 
     superblock m_superblock;
+    kstd::vector<block_group_descriptor> m_block_group_descriptors;
   };
 }  // namespace kernel::filesystem::ext2
 
diff --git a/kernel/src/filesystem/ext2/filesystem.cpp b/kernel/src/filesystem/ext2/filesystem.cpp
index 0ebb243..96c1589 100644
--- a/kernel/src/filesystem/ext2/filesystem.cpp
+++ b/kernel/src/filesystem/ext2/filesystem.cpp
@@ -3,12 +3,14 @@
 #include "kapi/devices/device.hpp"
 
 #include "kernel/devices/block_device_utils.hpp"
+#include "kernel/filesystem/ext2/block_group_descriptor.hpp"
 #include "kernel/filesystem/ext2/inode.hpp"
 #include "kernel/filesystem/ext2/superblock.hpp"
 #include "kernel/filesystem/filesystem.hpp"
 #include "kernel/filesystem/inode.hpp"
 
 #include <kstd/memory>
+#include <kstd/vector>
 
 #include <cstddef>
 #include <cstdint>
@@ -47,6 +49,17 @@ namespace kernel::filesystem::ext2
       return -1;
     }
 
+    auto const block_size = get_block_size();
+    auto const blocks_per_group = m_superblock.blocks_per_group;
+    auto const num_block_groups = (m_superblock.blocks_count + blocks_per_group - 1) / blocks_per_group;
+
+    m_block_group_descriptors = kstd::vector<block_group_descriptor>(num_block_groups);
+
+    auto const block_group_descriptor_table_offset = block_size == 1024 ? 2 * block_size : block_size;
+    kernel::devices::block_device_utils::read(m_device, m_block_group_descriptors.data(),
+                                              block_group_descriptor_table_offset,
+                                              num_block_groups * sizeof(block_group_descriptor));
+
     // TODO BA-FS26 load proper root inode from ext2 metadata
     // m_root_inode = inode{inode_kind::directory};
 
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