100 lines
2.4 KiB
Rust
100 lines
2.4 KiB
Rust
use crate::block_manager::*;
|
|
use anyhow::{anyhow, Result};
|
|
use nom::{bytes::complete::*, number::complete::*, IResult};
|
|
|
|
pub const SUPERBLOCK_LOCATION: u64 = 0;
|
|
//const UUID_SIZE: usize = 16;
|
|
const SPACE_MAP_ROOT_SIZE: usize = 128;
|
|
|
|
#[derive(Debug)]
|
|
pub struct Superblock {
|
|
pub block: u64,
|
|
//uuid: [u8; UUID_SIZE],
|
|
pub version: u32,
|
|
pub time: u32,
|
|
pub transaction_id: u64,
|
|
pub metadata_snap: u64,
|
|
//data_sm_root: [u8; SPACE_MAP_ROOT_SIZE],
|
|
//metadata_sm_root: [u8; SPACE_MAP_ROOT_SIZE],
|
|
pub mapping_root: u64,
|
|
pub details_root: u64,
|
|
pub 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,
|
|
}
|
|
*/
|
|
|
|
fn unpack(data: &[u8]) -> IResult<&[u8], Superblock> {
|
|
let (i, _csum) = le_u32(data)?;
|
|
let (i, _flags) = le_u32(i)?;
|
|
let (i, block) = le_u64(i)?;
|
|
let (i, _uuid) = take(16usize)(i)?;
|
|
let (i, _magic) = le_u64(i)?;
|
|
let (i, version) = le_u32(i)?;
|
|
let (i, time) = le_u32(i)?;
|
|
let (i, transaction_id) = le_u64(i)?;
|
|
let (i, metadata_snap) = le_u64(i)?;
|
|
let (i, _data_sm_root) = take(SPACE_MAP_ROOT_SIZE)(i)?;
|
|
let (i, _metadata_sm_root) = take(SPACE_MAP_ROOT_SIZE)(i)?;
|
|
let (i, mapping_root) = le_u64(i)?;
|
|
let (i, details_root) = le_u64(i)?;
|
|
let (i, data_block_size) = le_u32(i)?;
|
|
let (i, _metadata_block_size) = le_u32(i)?;
|
|
let (i, _metadata_nr_blocks) = le_u64(i)?;
|
|
|
|
Ok((
|
|
i,
|
|
Superblock {
|
|
block,
|
|
//uuid: uuid[0..UUID_SIZE],
|
|
version,
|
|
time,
|
|
transaction_id,
|
|
metadata_snap,
|
|
//data_sm_root,
|
|
//metadata_sm_root,
|
|
mapping_root,
|
|
details_root,
|
|
data_block_size,
|
|
},
|
|
))
|
|
}
|
|
|
|
pub fn read_superblock<E: IoEngine>(engine: &mut E, loc: u64) -> Result<Superblock> {
|
|
let mut b = Block::new(loc);
|
|
engine.read(&mut b)?;
|
|
|
|
if let Ok((_, sb)) = unpack(&b.get_data()) {
|
|
Ok(sb)
|
|
} else {
|
|
Err(anyhow!("couldn't unpack superblock"))
|
|
}
|
|
}
|
|
|
|
//------------------------------
|