Merge branch 'develop-BA-FS26' into 'develop'HEADdevelop

Merge of BA-FS26 branch into develop

See merge request teachos/kernel!49

1 files changed, 68 insertions, 0 deletions

diff --git a/kernel/src/test_support/filesystem/ext2.cpp b/kernel/src/test_support/filesystem/ext2.cpp
new file mode 100644
index 0000000..52b6efe
--- /dev/null
+++ b/kernel/src/test_support/filesystem/ext2.cpp
@@ -0,0 +1,68 @@
+#include <kernel/test_support/filesystem/ext2.hpp>
+
+#include <kernel/filesystem/ext2/block_group_descriptor.hpp>
+#include <kernel/filesystem/ext2/filesystem.hpp>
+#include <kernel/filesystem/ext2/inode.hpp>
+#include <kernel/filesystem/ext2/superblock.hpp>
+#include <kernel/test_support/devices/block_device.hpp>
+
+#include <cstdint>
+#include <cstring>
+
+namespace kernel::tests::filesystem::ext2
+{
+  namespace
+  {
+    constexpr uint32_t root_directory_data_block = 20;
+  }  // namespace
+
+  auto write_bytes(kernel::tests::devices::block_device & device, size_t offset, void const * source, size_t size)
+      -> void
+  {
+    auto const required_size = offset + size;
+    if (device.data.size() < required_size)
+    {
+      device.data.resize(required_size, 0);
+    }
+
+    std::memcpy(device.data.data() + offset, source, size);
+  }
+
+  auto write_u32(kernel::tests::devices::block_device & device, size_t offset, uint32_t value) -> void
+  {
+    write_bytes(device, offset, &value, sizeof(value));
+  }
+
+  auto setup_mock_ext2_layout(kernel::tests::devices::block_device & device) -> void
+  {
+    auto superblock = kernel::filesystem::ext2::superblock{};
+    superblock.magic = kernel::filesystem::ext2::constants::magic_number;
+    superblock.log_block_size = 0;
+    superblock.blocks_count = 64;
+    superblock.blocks_per_group = 64;
+    superblock.inodes_per_group = 32;
+    superblock.rev_level = 1;
+    superblock.inode_size = 128;
+    setup_mock_ext2_layout(device, superblock);
+  }
+
+  auto setup_mock_ext2_layout(kernel::tests::devices::block_device & device,
+                              kernel::filesystem::ext2::superblock const & superblock) -> void
+  {
+    write_bytes(device, kernel::filesystem::ext2::constants::superblock_offset, &superblock, sizeof(superblock));
+
+    auto group_descriptor = kernel::filesystem::ext2::block_group_descriptor{};
+    group_descriptor.inode_table = 5;
+    write_bytes(device, 2048, &group_descriptor, sizeof(group_descriptor));
+
+    auto root_inode_data = kernel::filesystem::ext2::inode_data{};
+    root_inode_data.mode = kernel::filesystem::ext2::constants::mode_directory;
+    root_inode_data.blocks = 2;
+    root_inode_data.block[0] = root_directory_data_block;
+
+    auto const root_inode_offset =
+        static_cast<size_t>(group_descriptor.inode_table) * kernel::filesystem::ext2::constants::base_block_size +
+        (kernel::filesystem::ext2::constants::root_inode_number - 1) * superblock.inode_size;
+    write_bytes(device, root_inode_offset, &root_inode_data, sizeof(root_inode_data));
+  }
+}  // namespace kernel::tests::filesystem::ext2
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