From b03b6b851082d91ca374fed3e8a070d278eb93ab Mon Sep 17 00:00:00 2001
From: "marcel.braun" <marcel.braun@ost.ch>
Date: Sun, 29 Mar 2026 17:22:55 +0200
Subject: Add ext2 block_group_descriptor, inode and linked_directory_entry
 definitions

---
 .../ext2/ext2_block_group_descriptor.hpp           | 21 ++++++++++++++++++++
 .../include/kernel/filesystem/ext2/ext2_inode.hpp  | 23 ++++++++++++++++++++++
 .../ext2/ext2_linked_directory_entry.hpp           | 20 +++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 kernel/include/kernel/filesystem/ext2/ext2_block_group_descriptor.hpp
 create mode 100644 kernel/include/kernel/filesystem/ext2/ext2_linked_directory_entry.hpp

(limited to 'kernel')

diff --git a/kernel/include/kernel/filesystem/ext2/ext2_block_group_descriptor.hpp b/kernel/include/kernel/filesystem/ext2/ext2_block_group_descriptor.hpp
new file mode 100644
index 0000000..b0966da
--- /dev/null
+++ b/kernel/include/kernel/filesystem/ext2/ext2_block_group_descriptor.hpp
@@ -0,0 +1,21 @@
+#ifndef EXT2_BLOCK_GROUP_DESCRIPTOR_HPP
+#define EXT2_BLOCK_GROUP_DESCRIPTOR_HPP
+
+#include <array>
+#include <cstdint>
+
+namespace filesystem::ext2
+{
+  struct ext2_block_group_descriptor
+  {
+    uint32_t block_bitmap;
+    uint32_t inode_bitmap;
+    uint32_t inode_table;
+    uint16_t free_blocks_count;
+    uint16_t free_inodes_count;
+    uint16_t used_dirs_count;
+    std::array<uint8_t, 2> padding;
+    std::array<uint8_t, 12> reserved;  // NOLINT(readability-magic-numbers)
+  };
+}  // namespace filesystem::ext2
+#endif  // EXT2_BLOCK_GROUP_DESCRIPTOR_HPP
\ No newline at end of file
diff --git a/kernel/include/kernel/filesystem/ext2/ext2_inode.hpp b/kernel/include/kernel/filesystem/ext2/ext2_inode.hpp
index 3f6a3b0..c35f84c 100644
--- a/kernel/include/kernel/filesystem/ext2/ext2_inode.hpp
+++ b/kernel/include/kernel/filesystem/ext2/ext2_inode.hpp
@@ -5,7 +5,9 @@
 
 #include <kstd/memory>
 
+#include <array>
 #include <cstddef>
+#include <cstdint>
 
 namespace filesystem::ext2
 {
@@ -15,6 +17,27 @@ namespace filesystem::ext2
 
     auto read(void * buffer, size_t offset, size_t size) const -> size_t override;
     auto write(void const * buffer, size_t offset, size_t size) -> size_t override;
+
+    uint16_t mode;
+    uint16_t uid;
+    uint32_t size;
+    uint32_t atime;
+    uint32_t ctime;
+    uint32_t mtime;
+    uint32_t dtime;
+    uint16_t gid;
+    uint16_t links_count;
+    uint32_t blocks;
+    uint32_t flags;
+    uint32_t osd1;
+    // uint32_t block[15]; // TODO BA-FS26 really correct?
+    std::array<uint32_t, 15> block;  // NOLINT(readability-magic-numbers)
+    uint32_t generation;
+    uint32_t file_acl;
+    uint32_t dir_acl;
+    uint32_t faddr;
+    // uint8_t osd2[12]; // TODO BA-FS26 really correct?
+    std::array<uint8_t, 12> osd2;  // NOLINT(readability-magic-numbers)
   };
 }  // namespace filesystem::ext2
 
diff --git a/kernel/include/kernel/filesystem/ext2/ext2_linked_directory_entry.hpp b/kernel/include/kernel/filesystem/ext2/ext2_linked_directory_entry.hpp
new file mode 100644
index 0000000..2a8872b
--- /dev/null
+++ b/kernel/include/kernel/filesystem/ext2/ext2_linked_directory_entry.hpp
@@ -0,0 +1,20 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_EXT2_LINKED_DIRECTORY_ENTRY_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_EXT2_LINKED_DIRECTORY_ENTRY_HPP
+
+#include <array>
+#include <cstdint>
+
+namespace filesystem::ext2
+{
+  struct ext2_linked_directory_entry
+  {
+    uint32_t inode;
+    uint16_t rec_len;
+    uint8_t name_len;
+    uint8_t file_type;
+    uint8_t pad;
+    std::array<uint8_t, 256> name;
+  };
+}  // namespace filesystem::ext2
+
+#endif
\ No newline at end of file
-- 
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