feat(storage): full file protocol over per-client shared region (badged clients, owned handles, clamped lengths, ReadOnly on unwritable disk); init loads via libkos::fs; drop boot shared buffer

crates/types/src/lib.rs

@@ -12,5 +12,6 @@ pub mod mapping;
 pub mod permission;
 #[cfg(kani)]
 pub mod proofs;
+pub mod storage;
 pub mod syscall_abi;
 pub mod time;

crates/types/src/storage.rs

@@ -0,0 +1,43 @@
+//! The storage protocol's wire numbers, shared by the server
+//! (`storage_server::protocol`) and the client (`libkos::fs`) so the two
+//! cannot drift apart.
+
+/// Size of each client's buffer.
+pub const BUFFER_PAGES: usize = 16;
+pub const BUFFER_SIZE: usize = BUFFER_PAGES * 4096;
+/// Longest path the server will look at.
+pub const MAX_PATH: usize = 255;
+/// One `ListDir` record: the name (NUL padded), then the size and flags
+/// as little-endian u64s. Flag bit 0: a directory.
+pub const DIR_ENTRY_SIZE: usize = 48;
+pub const DIR_NAME_SIZE: usize = 32;
+pub const DIR_FLAG_DIRECTORY: u64 = 1;
+
+/// Request opcodes (word 0).
+pub mod op {
+    pub const ATTACH: usize = 0;
+    pub const OPEN: usize = 1;
+    pub const READ: usize = 2;
+    pub const WRITE: usize = 3;
+    pub const CLOSE: usize = 4;
+    pub const FILE_SIZE: usize = 5;
+    pub const LIST_DIR: usize = 6;
+    pub const CREATE: usize = 7;
+    pub const DELETE: usize = 8;
+    pub const MKDIR: usize = 9;
+}
+
+/// Reply tags (word 0).
+pub mod reply {
+    pub const ATTACHED: usize = 0;
+    pub const HANDLE: usize = 1;
+    pub const DATA: usize = 2;
+    pub const WRITTEN: usize = 3;
+    pub const OK: usize = 4;
+    pub const DIR_ENTRIES: usize = 5;
+    pub const SIZE: usize = 6;
+    pub const NOT_FOUND: usize = 7;
+    pub const ERROR: usize = 8;
+    pub const READ_ONLY: usize = 9;
+    pub const NOT_ATTACHED: usize = 10;
+}