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/launch.rs

@@ -44,7 +44,10 @@ impl<'a> Launcher<'a> {
     ) -> Result<Self, &'static str> {
         let spawn_ep = syscall::create_endpoint().ok_or("no spawn endpoint")?;
         let deaths = syscall::create_notification().map_err(|_| "no death notification")?;
-        Ok(Self { storage, scratch, devices, served: [None; MAX_SERVED], next_badge: 1, spawn_ep, deaths, spawner: Spawner::new() })
+        // Storage was started by boot, before init; programs may use it too.
+        let mut served = [None; MAX_SERVED];
+        served[0] = Some(("storage", crate::STORAGE_EP));
+        Ok(Self { storage, scratch, devices, served, next_badge: 1, spawn_ep, deaths, spawner: Spawner::new() })
     }
 
     pub(crate) fn storage(&mut self) -> (&mut Storage, &mut [u8]) {

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());

crates/init/src/manifest.rs

@@ -70,6 +70,7 @@ pub const SERVERS: &[Program] = &[
 /// spawns through init, then reports and halts.
 pub const TESTS: &[Program] = &[Program {
     serves: false,
+    uses: &["storage"],
     spawns: Some(Limits { pages: 128, endpoints: 2, notifications: 2, regions: 2 }),
     system_control: true,
     ..server("spawntest", b"spawntst.elf", SMALL)