feat(storage): ext4-only disk via mkfs.ext4 -d; drop FAT16; feature-gated mount (ro on unknown ro_compat); ext4 read spans blocks, delete clears inode, mkdir counts dir; virtio-blk writes; test-qemu e2fsck gate

crates/init/src/lib.rs

@@ -18,7 +18,7 @@ use types::permission::{Permission, PermissionSet};
 /// Where the buffer storage shares with init is mapped.
 const STORAGE_BUF_VA: usize = 0x0180_0000;
 /// Boot loads storage before init and leaves its endpoint here.
-const STORAGE_EP: CapSlot = CapSlot::const_new(2);
+pub(crate) const STORAGE_EP: CapSlot = CapSlot::const_new(2);
 
 pub fn run() -> ! {
     libkos::start::set_console(devices::console());