From 725116d22e850c502e6cb8d42b100da1080dfec0 Mon Sep 17 00:00:00 2001
From: Marcel Braun <marcel.braun@ost.ch>
Date: Mon, 6 Apr 2026 10:35:45 +0200
Subject: Add file system pointer to ext2 inode

---
 kernel/src/filesystem/ext2/inode.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'kernel/src/filesystem/ext2/inode.cpp')

diff --git a/kernel/src/filesystem/ext2/inode.cpp b/kernel/src/filesystem/ext2/inode.cpp
index b75969a..4d36e66 100644
--- a/kernel/src/filesystem/ext2/inode.cpp
+++ b/kernel/src/filesystem/ext2/inode.cpp
@@ -1,14 +1,22 @@
 #include "kernel/filesystem/ext2/inode.hpp"
 
+#include "kapi/system.hpp"
+
 #include "kernel/filesystem/inode.hpp"
 
 #include <cstddef>
 
 namespace kernel::filesystem::ext2
 {
-  inode::inode()
+  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
   {
-- 
cgit v1.2.3


From 4a2d4fb3ab38a64c4b10832f5a6318b7240829cc Mon Sep 17 00:00:00 2001
From: Marcel Braun <marcel.braun@ost.ch>
Date: Mon, 6 Apr 2026 11:40:12 +0200
Subject: Implement read data in ext2 inode

---
 kernel/src/filesystem/ext2/inode.cpp | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

(limited to 'kernel/src/filesystem/ext2/inode.cpp')

diff --git a/kernel/src/filesystem/ext2/inode.cpp b/kernel/src/filesystem/ext2/inode.cpp
index 4d36e66..7f4cf69 100644
--- a/kernel/src/filesystem/ext2/inode.cpp
+++ b/kernel/src/filesystem/ext2/inode.cpp
@@ -2,9 +2,13 @@
 
 #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
 {
@@ -18,10 +22,33 @@ namespace kernel::filesystem::ext2
     }
   }
 
-  auto inode::read(void * /*buffer*/, size_t /*offset*/, size_t /*size*/) const -> size_t
+  auto inode::read(void * buffer, size_t offset, size_t size) const -> size_t
   {
-    // TODO BA-FS26 implement
-    return 0;
+    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
-- 
cgit v1.2.3


From dd330e7a05905713acfa87ec109956bfe78f78c4 Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Wed, 8 Apr 2026 09:31:32 +0200
Subject: add descriptions, some refactoring

---
 kernel/src/filesystem/ext2/inode.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/src/filesystem/ext2/inode.cpp')

diff --git a/kernel/src/filesystem/ext2/inode.cpp b/kernel/src/filesystem/ext2/inode.cpp
index 7f4cf69..a29bb3b 100644
--- a/kernel/src/filesystem/ext2/inode.cpp
+++ b/kernel/src/filesystem/ext2/inode.cpp
@@ -53,7 +53,7 @@ namespace kernel::filesystem::ext2
 
   auto inode::write(void const * /*buffer*/, size_t /*offset*/, size_t /*size*/) -> size_t
   {
-    // TODO BA-FS26 implement
+    kapi::system::panic("[EXT2] inode::write is not implemented yet");
     return 0;
   }
 }  // namespace kernel::filesystem::ext2
\ No newline at end of file
-- 
cgit v1.2.3