read block_group_descriptors

1 files changed, 13 insertions, 0 deletions

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};