[VFS] Skeleton for moving victoria falls to rust.

rust/lib/fs/ext2/src/ext2_driver.rs

@@ -0,0 +1,19 @@
+use denali_client::DiskReader;
+use mammoth::mem::MemoryRegion;
+
+use crate::types::Superblock;
+
+pub struct Ext2Driver {
+    reader: DiskReader,
+}
+
+impl Ext2Driver {
+    pub fn new(mut reader: DiskReader) -> Self {
+        let super_block_mem = MemoryRegion::from_cap(reader.read(2, 2).unwrap()).unwrap();
+        let super_block: &Superblock = super_block_mem.as_ref();
+        let inodes = super_block.inodes_count;
+        let magic = super_block.magic;
+        mammoth::debug!("Superblock ({:#x}): inodes: {:#x}", magic, inodes);
+        Self { reader }
+    }
+}

rust/lib/fs/ext2/src/lib.rs

@@ -0,0 +1,8 @@
+#![no_std]
+
+extern crate alloc;
+
+mod ext2_driver;
+mod types;
+
+pub use ext2_driver::Ext2Driver;

rust/lib/fs/ext2/src/types.rs

@@ -0,0 +1,30 @@
+#[repr(C, packed)]
+pub struct Superblock {
+    pub inodes_count: u32,
+    pub blocks_count: u32,
+    pub reserved_blocks_count: u32,
+    pub free_blocks_count: u32,
+    pub free_inodes_count: u32,
+    pub first_data_blok: u32,
+    pub log_block_size: u32,
+    pub log_frag_size: u32,
+    pub blocks_per_group: u32,
+    pub frags_per_group: u32,
+    pub inodes_per_group: u32,
+    pub mtime: u32,
+    pub wtime: u32,
+    pub mnt_count: u16,
+    pub max_mnt_count: u16,
+    pub magic: u16,
+    pub state: u16,
+    pub errors: u16,
+    pub minor_rev_level: u16,
+    pub lastcheck: u32,
+    pub checkinterval: u32,
+    pub creator_os: u32,
+    pub rev_level: u32,
+    pub def_resuid: u16,
+    pub def_resgid: u16,
+    pub first_ino: u32,
+    pub inode_size: u16,
+}