wip

src/thin/mod.rs

@@ -0,0 +1 @@
+mod superblock;

src/thin/superblock.rs

@@ -0,0 +1,60 @@
+use crate::block_manager::*;
+use crate::checksum::*;
+
+const SPACE_MAP_ROOT_SIZE: usize = 128;
+
+pub struct Superblock {
+    block: u64,
+    uuid: String,
+    version: u32,
+    time: u32,
+    transaction_id: u64,
+    metadata_snap: u64,
+    data_sm_root: [u8; SPACE_MAP_ROOT_SIZE],
+    metadata_sn_root: [u8; SPACE_MAP_ROOT_SIZE],
+    mapping_root: u64,
+    details_root: u64,
+    data_block_size: u32,
+}
+
+pub enum CheckSeverity {
+    Fatal,
+    NonFatal,
+}
+
+pub trait CheckError {
+    fn severity(&self) -> CheckSeverity;
+    fn block(&self) -> u64;
+    fn sub_errors(&self) -> Vec<Box<dyn CheckError>>;
+}
+
+enum ErrorType {
+    BadChecksum,
+    BadBlockType(&'static str),
+    BadBlock(u64),
+    BadVersion(u32),
+    MetadataSnapOutOfBounds(u64),
+    MappingRootOutOfBounds(u64),
+    DetailsRootOutOfBounds(u64),
+}
+
+struct SuperblockError {
+    severity: CheckSeverity,
+    kind: ErrorType,
+}
+
+use SuperblockDamage::*;
+
+//------------------------------
+
+pub fn check_type(b: &Block) -> Result<(), Box<dyn CheckError>> {
+    match metadata_block_type(&b.data[0..]) {
+        SUPERBLOCK => Ok(()),
+        NODE => Err(Box::new(BadBlockType("BTree Node"))),
+        INDEX => Err(Box::new(BadBlockType("Space Map Index"))),
+        BITMAP => Err(Box::new(BadBlockType("Space Map Bitmap"))),
+        UNKNOWN => Err(Box::new(BadChecksum)),
+    }
+}
+
+//------------------------------