[VFS] Skeleton for moving victoria falls to rust.

rust/lib/client/denali_client/src/disk_reader.rs

@@ -0,0 +1,31 @@
+use mammoth::{cap::Capability, zion::ZError};
+
+use crate::{DenaliClient, DiskBlock, ReadRequest};
+
+pub struct DiskReader {
+    client: DenaliClient,
+    disk_id: u64,
+    lba_offset: u64,
+}
+
+impl DiskReader {
+    pub fn new(client: DenaliClient, disk_id: u64, lba_offset: u64) -> Self {
+        Self {
+            client,
+            disk_id,
+            lba_offset,
+        }
+    }
+
+    pub fn read(&mut self, lba: u64, cnt: u64) -> Result<Capability, ZError> {
+        let read_resp = self.client.read(&ReadRequest {
+            device_id: self.disk_id,
+            block: DiskBlock {
+                lba: self.lba_offset + lba,
+                size: cnt,
+            },
+        })?;
+
+        Ok(Capability::take(read_resp.memory))
+    }
+}

rust/lib/client/denali_client/src/lib.rs

@@ -3,3 +3,7 @@
 use core::include;
 
 include!(concat!(env!("OUT_DIR"), "/yunq.rs"));
+
+mod disk_reader;
+
+pub use disk_reader::DiskReader;