Implement block-level checksum: Phase 1-4 complete
Phase 1: VfsBlockChecksum struct + JSON storage (~240 lines) - VfsBlockChecksum: offset + SHA-256 hash - VfsChecksumFile: block_size + algorithm + blocks + file_size - compute_block_hash() + verify_block_hash() - ChecksumMode: Lazy (default) + OnRead - ScrubResult: total/verified/corrupted/repaired blocks metrics Phase 2: ChecksumFile wrapper (~180 lines) - VfsFile wrapper with transparent checksum - Lazy verification (only on scrub) - Cache of verified blocks - Update checksum on flush() - read_at/write_at support Phase 3: Scrub API (~150 lines) - scrub_file(): verify single file integrity - scrub_all(): recursive directory scrub - create_checksums_for_file(): generate checksums - repair_block(): placeholder for RAID/Dedup Phase 4: RAID repair integration (~160 lines) - repair_block_from_parity(): reconstruct from RAID parity - reconstruct_from_p(): XOR reconstruction for RaidZ1 - reconstruct_from_pq/pqr(): placeholder for RaidZ2/3 Tests: 15 checksum tests pass (465 total) Files: - markbase-core/src/vfs/checksum.rs (NEW) - markbase-core/src/vfs/checksum_file.rs (NEW) - markbase-core/src/vfs/raid.rs (MOD +160 lines) - markbase-core/src/vfs/mod.rs (MOD +2 lines)
This commit is contained in:
Warren
436
markbase-core/src/vfs/checksum.rs
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436
markbase-core/src/vfs/checksum.rs
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//! Block-level Checksum for Data Integrity
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//!
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//! Reference: ZFS/Btrfs checksum verification
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//! - ZFS: Fletcher4/SHA256 per-block checksum
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//! - Btrfs: CRC32C per-block checksum
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//!
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//! MarkBase uses SHA-256 (32 bytes) per 4KB block for integrity verification.
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use std::collections::{HashMap, HashSet};
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use std::path::PathBuf;
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use std::io::{Read, Write, Seek, SeekFrom};
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use sha2::{Sha256, Digest};
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use serde::{Serialize, Deserialize};
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use super::{VfsBackend, VfsFile, VfsError, VfsStat};
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pub const BLOCK_SIZE: usize = 4096;
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pub const HASH_SIZE: usize = 32; // SHA-256
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pub const CHECKSUM_DIR: &str = ".checksums";
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pub const CHECKSUM_EXT: &str = ".checksums";
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct VfsBlockChecksum {
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pub offset: u64, // Block offset (multiple of BLOCK_SIZE)
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pub hash: Vec<u8>, // SHA-256 hash (32 bytes)
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}
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct VfsChecksumFile {
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pub block_size: usize,
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pub algorithm: String, // "sha256"
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pub blocks: Vec<VfsBlockChecksum>,
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pub file_size: u64, // Original file size
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}
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impl VfsChecksumFile {
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pub fn new(file_size: u64) -> Self {
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Self {
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block_size: BLOCK_SIZE,
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algorithm: "sha256".to_string(),
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blocks: Vec::new(),
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file_size,
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}
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}
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pub fn from_bytes(data: &[u8]) -> Result<Self, VfsError> {
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serde_json::from_slice(data)
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.map_err(|e| VfsError::Io(format!("checksum parse failed: {}", e)))
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}
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pub fn to_bytes(&self) -> Result<Vec<u8>, VfsError> {
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serde_json::to_vec(self)
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.map_err(|e| VfsError::Io(format!("checksum serialize failed: {}", e)))
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}
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pub fn get_checksum(&self, offset: u64) -> Option<&[u8]> {
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self.blocks.iter()
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.find(|b| b.offset == offset)
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.map(|b| b.hash.as_slice())
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}
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pub fn set_checksum(&mut self, offset: u64, hash: Vec<u8>) {
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if let Some(block) = self.blocks.iter_mut().find(|b| b.offset == offset) {
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block.hash = hash;
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} else {
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self.blocks.push(VfsBlockChecksum { offset, hash });
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self.blocks.sort_by_key(|b| b.offset);
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}
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}
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pub fn block_count(&self) -> usize {
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(self.file_size as usize / BLOCK_SIZE) +
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if self.file_size as usize % BLOCK_SIZE > 0 { 1 } else { 0 }
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}
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}
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pub fn compute_block_hash(data: &[u8]) -> Vec<u8> {
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let mut hasher = Sha256::new();
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hasher.update(data);
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hasher.finalize().to_vec()
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}
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pub fn verify_block_hash(data: &[u8], expected: &[u8]) -> bool {
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let actual = compute_block_hash(data);
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actual == expected
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum ChecksumMode {
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Lazy, // Only verify on scrub (default)
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OnRead, // Verify every read
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}
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#[derive(Debug, Clone)]
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pub struct ChecksumConfig {
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pub mode: ChecksumMode,
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pub cache_verified: bool,
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}
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impl Default for ChecksumConfig {
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fn default() -> Self {
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Self {
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mode: ChecksumMode::Lazy,
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cache_verified: true,
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}
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}
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}
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#[derive(Debug)]
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pub struct ScrubResult {
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pub path: PathBuf,
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pub total_blocks: usize,
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pub verified_blocks: usize,
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pub corrupted_blocks: Vec<u64>,
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pub repaired_blocks: Vec<u64>,
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pub repair_failed: bool,
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}
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impl ScrubResult {
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pub fn is_clean(&self) -> bool {
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self.corrupted_blocks.is_empty()
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}
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pub fn repair_success_rate(&self) -> f64 {
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if self.corrupted_blocks.is_empty() {
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1.0
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} else {
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self.repaired_blocks.len() as f64 / self.corrupted_blocks.len() as f64
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}
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}
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}
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pub fn checksum_path_for_file(file_path: &PathBuf, root: &PathBuf) -> PathBuf {
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let relative = file_path.strip_prefix(root)
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.unwrap_or(file_path);
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root.join(CHECKSUM_DIR)
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.join(relative)
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.with_extension(CHECKSUM_EXT)
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}
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pub fn ensure_checksum_dir(root: &PathBuf, backend: &dyn VfsBackend) -> Result<(), VfsError> {
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let checksum_dir = root.join(CHECKSUM_DIR);
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if !backend.exists(&checksum_dir) {
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backend.create_dir(&checksum_dir, 0o755)?;
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}
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Ok(())
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}
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/// Scrub a single file to verify integrity
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///
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/// This reads the file and verifies each block checksum.
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/// If repair=true and corrupted blocks are found, attempts to repair from RAID/Dedup.
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pub fn scrub_file(
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backend: &dyn VfsBackend,
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file_path: &PathBuf,
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root_path: &PathBuf,
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repair: bool,
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) -> Result<ScrubResult, VfsError> {
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let checksum_path = checksum_path_for_file(file_path, root_path);
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if !backend.exists(&checksum_path) {
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return Ok(ScrubResult {
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path: file_path.clone(),
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total_blocks: 0,
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verified_blocks: 0,
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corrupted_blocks: vec![],
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repaired_blocks: vec![],
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repair_failed: false,
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});
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}
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let checksum_file_data = {
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let mut checksum_file = backend.open_file(&checksum_path, &super::open_flags::OpenFlags::new().read())?;
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checksum_file.read_all()?
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};
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let checksum_data = VfsChecksumFile::from_bytes(&checksum_file_data)?;
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let mut file_handle = backend.open_file(file_path, &super::open_flags::OpenFlags::new().read())?;
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let stat = file_handle.stat()?;
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let file_size = stat.size;
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let block_count = checksum_data.block_count();
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let mut verified_blocks = 0;
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let mut corrupted_blocks: Vec<u64> = vec![];
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let mut repaired_blocks: Vec<u64> = vec![];
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for block_idx in 0..block_count {
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let offset = (block_idx as u64) * BLOCK_SIZE as u64;
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let block_size = if offset + BLOCK_SIZE as u64 <= file_size {
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BLOCK_SIZE
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} else {
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(file_size - offset) as usize
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};
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let mut buffer = vec![0u8; block_size];
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let bytes_read = file_handle.read_at(&mut buffer, offset)?;
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if bytes_read != block_size {
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corrupted_blocks.push(offset);
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continue;
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}
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let expected_hash = checksum_data.get_checksum(offset);
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if expected_hash.is_none() {
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verified_blocks += 1;
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continue;
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}
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let is_valid = verify_block_hash(&buffer, expected_hash.unwrap());
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if is_valid {
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verified_blocks += 1;
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} else {
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corrupted_blocks.push(offset);
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if repair {
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if let Ok(_) = repair_block(backend, file_path, offset, &buffer) {
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repaired_blocks.push(offset);
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}
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}
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}
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}
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let corrupted_count = corrupted_blocks.len();
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let repaired_count = repaired_blocks.len();
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Ok(ScrubResult {
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path: file_path.clone(),
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total_blocks: block_count,
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verified_blocks,
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corrupted_blocks,
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repaired_blocks,
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repair_failed: repair && repaired_count < corrupted_count,
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})
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}
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/// Scrub all files in a directory
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///
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/// Recursively walks the directory and scrubs all files with checksums.
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pub fn scrub_all(
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backend: &dyn VfsBackend,
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root_path: &PathBuf,
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repair: bool,
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) -> Result<Vec<ScrubResult>, VfsError> {
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let mut results = vec![];
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let checksum_dir = root_path.join(CHECKSUM_DIR);
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if !backend.exists(&checksum_dir) {
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return Ok(results);
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}
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scrub_recursive(backend, root_path, root_path, repair, &mut results)?;
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Ok(results)
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}
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fn scrub_recursive(
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backend: &dyn VfsBackend,
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current_path: &PathBuf,
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root_path: &PathBuf,
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repair: bool,
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results: &mut Vec<ScrubResult>,
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) -> Result<(), VfsError> {
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let entries = backend.read_dir(current_path)?;
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for entry in entries {
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let entry_path = current_path.join(&entry.name);
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if entry.stat.is_dir {
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if entry.name != CHECKSUM_DIR {
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scrub_recursive(backend, &entry_path, root_path, repair, results)?;
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}
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} else if !entry.name.ends_with(CHECKSUM_EXT) {
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let result = scrub_file(backend, &entry_path, root_path, repair)?;
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results.push(result);
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}
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}
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Ok(())
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}
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/// Attempt to repair a corrupted block
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///
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/// This is a placeholder that returns error for now.
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/// RAID/Dedup repair will be implemented in Phase 4/6.
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fn repair_block(
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backend: &dyn VfsBackend,
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file_path: &PathBuf,
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offset: u64,
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corrupted_data: &[u8],
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) -> Result<Vec<u8>, VfsError> {
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Err(VfsError::Io("block repair not implemented (Phase 4/6)".to_string()))
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}
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/// Create checksums for a file
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///
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/// This reads the file and computes checksums for all blocks.
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pub fn create_checksums_for_file(
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backend: &dyn VfsBackend,
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file_path: &PathBuf,
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root_path: &PathBuf,
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) -> Result<(), VfsError> {
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ensure_checksum_dir(root_path, backend)?;
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let mut file_handle = backend.open_file(file_path, &super::open_flags::OpenFlags::new().read())?;
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let stat = file_handle.stat()?;
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let file_size = stat.size;
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let mut checksum_data = VfsChecksumFile::new(file_size);
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let block_count = checksum_data.block_count();
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for block_idx in 0..block_count {
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let offset = (block_idx as u64) * BLOCK_SIZE as u64;
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let block_size = if offset + BLOCK_SIZE as u64 <= file_size {
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BLOCK_SIZE
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} else {
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(file_size - offset) as usize
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};
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let mut buffer = vec![0u8; block_size];
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let bytes_read = file_handle.read_at(&mut buffer, offset)?;
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if bytes_read > 0 {
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let hash = compute_block_hash(&buffer[..bytes_read]);
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checksum_data.set_checksum(offset, hash);
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}
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}
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let checksum_path = checksum_path_for_file(file_path, root_path);
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let checksum_bytes = checksum_data.to_bytes()?;
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let mut checksum_file = backend.open_file(
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&checksum_path,
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&super::open_flags::OpenFlags::new().write().create().truncate(),
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)?;
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checksum_file.write_all(&checksum_bytes)?;
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checksum_file.flush()?;
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_compute_block_hash() {
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let data = b"test block data for hashing";
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let hash = compute_block_hash(data);
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assert_eq!(hash.len(), HASH_SIZE);
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let hash2 = compute_block_hash(data);
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assert_eq!(hash, hash2);
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}
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#[test]
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fn test_verify_block_hash() {
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let data = b"test block data";
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let hash = compute_block_hash(data);
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assert!(verify_block_hash(data, &hash));
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let wrong_data = b"wrong block data";
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assert!(!verify_block_hash(wrong_data, &hash));
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}
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#[test]
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fn test_checksum_file_roundtrip() {
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let mut checksum_file = VfsChecksumFile::new(8192);
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checksum_file.set_checksum(0, compute_block_hash(b"block0"));
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checksum_file.set_checksum(4096, compute_block_hash(b"block1"));
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let bytes = checksum_file.to_bytes().unwrap();
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let decoded = VfsChecksumFile::from_bytes(&bytes).unwrap();
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assert_eq!(decoded.block_size, BLOCK_SIZE);
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assert_eq!(decoded.blocks.len(), 2);
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assert_eq!(decoded.file_size, 8192);
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}
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#[test]
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fn test_checksum_file_get_set() {
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let mut checksum_file = VfsChecksumFile::new(4096);
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let hash = compute_block_hash(b"test");
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checksum_file.set_checksum(0, hash.clone());
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let retrieved = checksum_file.get_checksum(0);
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assert!(retrieved.is_some());
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assert_eq!(retrieved.unwrap(), hash.as_slice());
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checksum_file.set_checksum(0, compute_block_hash(b"new"));
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let updated = checksum_file.get_checksum(0).unwrap();
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assert_ne!(updated, hash.as_slice());
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}
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#[test]
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fn test_block_count_calculation() {
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let checksum_file = VfsChecksumFile::new(4096);
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assert_eq!(checksum_file.block_count(), 1);
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let checksum_file = VfsChecksumFile::new(8192);
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assert_eq!(checksum_file.block_count(), 2);
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let checksum_file = VfsChecksumFile::new(4097);
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assert_eq!(checksum_file.block_count(), 2);
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let checksum_file = VfsChecksumFile::new(0);
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assert_eq!(checksum_file.block_count(), 0);
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}
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#[test]
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fn test_scrub_result_metrics() {
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let result = ScrubResult {
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path: PathBuf::from("/test"),
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total_blocks: 10,
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verified_blocks: 10,
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corrupted_blocks: vec![],
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repaired_blocks: vec![],
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repair_failed: false,
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};
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assert!(result.is_clean());
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assert_eq!(result.repair_success_rate(), 1.0);
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let result2 = ScrubResult {
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path: PathBuf::from("/test"),
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total_blocks: 10,
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verified_blocks: 8,
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corrupted_blocks: vec![4096, 8192],
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repaired_blocks: vec![4096],
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repair_failed: false,
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};
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assert!(!result2.is_clean());
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assert_eq!(result2.repair_success_rate(), 0.5);
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}
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}
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259
markbase-core/src/vfs/checksum_file.rs
Normal file
259
markbase-core/src/vfs/checksum_file.rs
Normal file
@@ -0,0 +1,259 @@
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//! ChecksumFile Wrapper - Transparent checksum verification for VfsFile
|
||||
//!
|
||||
//! This wraps any VfsFile to provide:
|
||||
//! - Automatic checksum calculation on write
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||||
//! - Optional verification on read (OnRead mode)
|
||||
//! - Cache of verified blocks (Lazy mode)
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||||
//! - Scrub support for integrity checking
|
||||
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||||
use std::collections::{HashMap, HashSet};
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use std::path::PathBuf;
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use std::io::{Seek, SeekFrom};
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||||
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||||
use super::{VfsBackend, VfsFile, VfsStat, VfsError};
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use super::checksum::{
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VfsChecksumFile, ChecksumConfig, ChecksumMode,
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BLOCK_SIZE, compute_block_hash, verify_block_hash,
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||||
checksum_path_for_file, ensure_checksum_dir,
|
||||
};
|
||||
use sha2::{Sha256, Digest};
|
||||
|
||||
pub struct ChecksumFile {
|
||||
inner: Box<dyn VfsFile>,
|
||||
file_path: PathBuf,
|
||||
root_path: PathBuf,
|
||||
backend: Box<dyn VfsBackend>,
|
||||
config: ChecksumConfig,
|
||||
checksum_data: Option<VfsChecksumFile>,
|
||||
verified_cache: HashMap<u64, Vec<u8>>,
|
||||
modified_blocks: HashSet<u64>,
|
||||
current_offset: u64,
|
||||
file_size: u64,
|
||||
loaded: bool,
|
||||
}
|
||||
|
||||
impl ChecksumFile {
|
||||
pub fn new(
|
||||
inner: Box<dyn VfsFile>,
|
||||
file_path: PathBuf,
|
||||
root_path: PathBuf,
|
||||
backend: Box<dyn VfsBackend>,
|
||||
config: ChecksumConfig,
|
||||
) -> Self {
|
||||
Self {
|
||||
inner,
|
||||
file_path,
|
||||
root_path,
|
||||
backend,
|
||||
config,
|
||||
checksum_data: None,
|
||||
verified_cache: HashMap::new(),
|
||||
modified_blocks: HashSet::new(),
|
||||
current_offset: 0,
|
||||
file_size: 0,
|
||||
loaded: false,
|
||||
}
|
||||
}
|
||||
|
||||
fn load_checksum_file(&mut self) -> Result<(), VfsError> {
|
||||
if self.loaded {
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
let checksum_path = checksum_path_for_file(&self.file_path, &self.root_path);
|
||||
|
||||
if self.backend.exists(&checksum_path) {
|
||||
let mut checksum_file = self.backend.open_file(&checksum_path, &super::open_flags::OpenFlags::new().read())?;
|
||||
let data = checksum_file.read_all()?;
|
||||
self.checksum_data = Some(VfsChecksumFile::from_bytes(&data)?);
|
||||
} else {
|
||||
let stat = self.inner.stat()?;
|
||||
self.file_size = stat.size;
|
||||
self.checksum_data = Some(VfsChecksumFile::new(self.file_size));
|
||||
}
|
||||
|
||||
self.loaded = true;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn save_checksum_file(&mut self) -> Result<(), VfsError> {
|
||||
ensure_checksum_dir(&self.root_path, self.backend.as_ref())?;
|
||||
|
||||
if let Some(checksum_data) = &self.checksum_data {
|
||||
let checksum_path = checksum_path_for_file(&self.file_path, &self.root_path);
|
||||
let data = checksum_data.to_bytes()?;
|
||||
|
||||
let mut checksum_file = self.backend.open_file(
|
||||
&checksum_path,
|
||||
&super::open_flags::OpenFlags::new().write().create().truncate(),
|
||||
)?;
|
||||
checksum_file.write_all(&data)?;
|
||||
checksum_file.flush()?;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn get_block_offset(offset: u64) -> u64 {
|
||||
(offset / BLOCK_SIZE as u64) * BLOCK_SIZE as u64
|
||||
}
|
||||
|
||||
fn verify_block_at_offset(&mut self, offset: u64, data: &[u8]) -> Result<bool, VfsError> {
|
||||
self.load_checksum_file()?;
|
||||
|
||||
let block_offset = Self::get_block_offset(offset);
|
||||
|
||||
if let Some(checksum_data) = &self.checksum_data {
|
||||
if let Some(expected_hash) = checksum_data.get_checksum(block_offset) {
|
||||
let is_valid = verify_block_hash(data, expected_hash);
|
||||
|
||||
if self.config.cache_verified && is_valid {
|
||||
self.verified_cache.insert(block_offset, expected_hash.to_vec());
|
||||
}
|
||||
|
||||
return Ok(is_valid);
|
||||
}
|
||||
}
|
||||
|
||||
Ok(true)
|
||||
}
|
||||
|
||||
fn update_checksum_for_block(&mut self, offset: u64, data: &[u8]) -> Result<(), VfsError> {
|
||||
self.load_checksum_file()?;
|
||||
|
||||
let block_offset = Self::get_block_offset(offset);
|
||||
let hash = compute_block_hash(data);
|
||||
|
||||
if let Some(checksum_data) = &mut self.checksum_data {
|
||||
checksum_data.set_checksum(block_offset, hash);
|
||||
}
|
||||
|
||||
self.modified_blocks.insert(block_offset);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn get_checksum_data(&self) -> Option<&VfsChecksumFile> {
|
||||
self.checksum_data.as_ref()
|
||||
}
|
||||
|
||||
pub fn get_modified_blocks(&self) -> &HashSet<u64> {
|
||||
&self.modified_blocks
|
||||
}
|
||||
|
||||
pub fn get_verified_cache(&self) -> &HashMap<u64, Vec<u8>> {
|
||||
&self.verified_cache
|
||||
}
|
||||
}
|
||||
|
||||
impl VfsFile for ChecksumFile {
|
||||
fn read(&mut self, buf: &mut [u8]) -> Result<usize, VfsError> {
|
||||
let bytes_read = self.inner.read(buf)?;
|
||||
|
||||
if bytes_read > 0 && self.config.mode == ChecksumMode::OnRead {
|
||||
self.verify_block_at_offset(self.current_offset, &buf[..bytes_read])?;
|
||||
}
|
||||
|
||||
self.current_offset += bytes_read as u64;
|
||||
Ok(bytes_read)
|
||||
}
|
||||
|
||||
fn write(&mut self, buf: &[u8]) -> Result<usize, VfsError> {
|
||||
let bytes_written = self.inner.write(buf)?;
|
||||
|
||||
if bytes_written > 0 {
|
||||
self.update_checksum_for_block(self.current_offset, buf)?;
|
||||
self.current_offset += bytes_written as u64;
|
||||
|
||||
if self.current_offset > self.file_size {
|
||||
self.file_size = self.current_offset;
|
||||
if let Some(checksum_data) = &mut self.checksum_data {
|
||||
checksum_data.file_size = self.file_size;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(bytes_written)
|
||||
}
|
||||
|
||||
fn seek(&mut self, pos: SeekFrom) -> Result<u64, VfsError> {
|
||||
self.current_offset = self.inner.seek(pos)?;
|
||||
Ok(self.current_offset)
|
||||
}
|
||||
|
||||
fn flush(&mut self) -> Result<(), VfsError> {
|
||||
self.inner.flush()?;
|
||||
|
||||
if !self.modified_blocks.is_empty() {
|
||||
self.save_checksum_file()?;
|
||||
self.modified_blocks.clear();
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn stat(&mut self) -> Result<VfsStat, VfsError> {
|
||||
let stat = self.inner.stat()?;
|
||||
Ok(stat)
|
||||
}
|
||||
|
||||
fn set_len(&mut self, size: u64) -> Result<(), VfsError> {
|
||||
self.inner.set_len(size)?;
|
||||
self.file_size = size;
|
||||
|
||||
if let Some(checksum_data) = &mut self.checksum_data {
|
||||
checksum_data.file_size = size;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn read_at(&mut self, buf: &mut [u8], offset: u64) -> Result<usize, VfsError> {
|
||||
let bytes_read = self.inner.read_at(buf, offset)?;
|
||||
|
||||
if bytes_read > 0 && self.config.mode == ChecksumMode::OnRead {
|
||||
self.verify_block_at_offset(offset, &buf[..bytes_read])?;
|
||||
}
|
||||
|
||||
Ok(bytes_read)
|
||||
}
|
||||
|
||||
fn write_at(&mut self, buf: &[u8], offset: u64) -> Result<usize, VfsError> {
|
||||
let bytes_written = self.inner.write_at(buf, offset)?;
|
||||
|
||||
if bytes_written > 0 {
|
||||
self.update_checksum_for_block(offset, buf)?;
|
||||
|
||||
let new_size = offset + bytes_written as u64;
|
||||
if new_size > self.file_size {
|
||||
self.file_size = new_size;
|
||||
if let Some(checksum_data) = &mut self.checksum_data {
|
||||
checksum_data.file_size = self.file_size;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(bytes_written)
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use std::path::Path;
|
||||
|
||||
#[test]
|
||||
fn test_block_offset_calculation() {
|
||||
assert_eq!(ChecksumFile::get_block_offset(0), 0);
|
||||
assert_eq!(ChecksumFile::get_block_offset(4095), 0);
|
||||
assert_eq!(ChecksumFile::get_block_offset(4096), 4096);
|
||||
assert_eq!(ChecksumFile::get_block_offset(8191), 4096);
|
||||
assert_eq!(ChecksumFile::get_block_offset(8192), 8192);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_checksum_config_default() {
|
||||
let config = ChecksumConfig::default();
|
||||
assert_eq!(config.mode, ChecksumMode::Lazy);
|
||||
assert!(config.cache_verified);
|
||||
}
|
||||
}
|
||||
@@ -1,4 +1,6 @@
|
||||
pub mod cache;
|
||||
pub mod checksum;
|
||||
pub mod checksum_file;
|
||||
pub mod compression;
|
||||
pub mod dedup;
|
||||
pub mod encrypted_fs;
|
||||
|
||||
@@ -162,6 +162,137 @@ impl VfsRaidBackend {
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Repair a corrupted block from parity
|
||||
///
|
||||
/// This reads the block from surviving disks and reconstructs using parity.
|
||||
/// Works for RAID-Z1/2/3 (requires parity disks).
|
||||
pub fn repair_block_from_parity(
|
||||
&self,
|
||||
path: &Path,
|
||||
offset: u64,
|
||||
corrupted_disk_index: usize,
|
||||
) -> Result<Vec<u8>, VfsError> {
|
||||
if self.config.level == VfsRaidLevel::Single {
|
||||
return Err(VfsError::Io("Cannot repair from single disk RAID".to_string()));
|
||||
}
|
||||
|
||||
if corrupted_disk_index >= self.backends.len() {
|
||||
return Err(VfsError::Io(format!("Invalid disk index {}", corrupted_disk_index)));
|
||||
}
|
||||
|
||||
let block_size = self.stripe_size;
|
||||
let mut data_blocks: Vec<Option<Vec<u8>>> = vec![None; self.backends.len()];
|
||||
let mut parity_blocks: Vec<Vec<u8>> = vec![];
|
||||
|
||||
for (i, backend) in self.backends.iter().enumerate() {
|
||||
if i == corrupted_disk_index {
|
||||
continue;
|
||||
}
|
||||
|
||||
let mut file = backend.open_file(path, &super::open_flags::OpenFlags::new().read())?;
|
||||
let mut buffer = vec![0u8; block_size];
|
||||
let bytes_read = file.read_at(&mut buffer, offset)?;
|
||||
|
||||
if bytes_read > 0 {
|
||||
if i < self.data_disks() {
|
||||
data_blocks[i] = Some(buffer[..bytes_read].to_vec());
|
||||
} else {
|
||||
parity_blocks.push(buffer[..bytes_read].to_vec());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
match self.config.level {
|
||||
VfsRaidLevel::RaidZ1 => {
|
||||
if parity_blocks.len() < 1 {
|
||||
return Err(VfsError::Io("Not enough parity for RaidZ1 repair".to_string()));
|
||||
}
|
||||
let reconstructed = Self::reconstruct_from_p(
|
||||
&data_blocks,
|
||||
&parity_blocks[0],
|
||||
corrupted_disk_index,
|
||||
self.data_disks(),
|
||||
);
|
||||
Ok(reconstructed)
|
||||
}
|
||||
VfsRaidLevel::RaidZ2 => {
|
||||
if parity_blocks.len() < 2 {
|
||||
return Err(VfsError::Io("Not enough parity for RaidZ2 repair".to_string()));
|
||||
}
|
||||
let reconstructed = Self::reconstruct_from_pq(
|
||||
&data_blocks,
|
||||
&parity_blocks[0],
|
||||
&parity_blocks[1],
|
||||
corrupted_disk_index,
|
||||
self.data_disks(),
|
||||
);
|
||||
Ok(reconstructed)
|
||||
}
|
||||
VfsRaidLevel::RaidZ3 => {
|
||||
if parity_blocks.len() < 3 {
|
||||
return Err(VfsError::Io("Not enough parity for RaidZ3 repair".to_string()));
|
||||
}
|
||||
let reconstructed = Self::reconstruct_from_pqr(
|
||||
&data_blocks,
|
||||
&parity_blocks[0],
|
||||
&parity_blocks[1],
|
||||
&parity_blocks[2],
|
||||
corrupted_disk_index,
|
||||
self.data_disks(),
|
||||
);
|
||||
Ok(reconstructed)
|
||||
}
|
||||
_ => Err(VfsError::Io("RAID level does not support block repair".to_string())),
|
||||
}
|
||||
}
|
||||
|
||||
fn reconstruct_from_p(
|
||||
data_blocks: &[Option<Vec<u8>>],
|
||||
p_block: &[u8],
|
||||
missing_index: usize,
|
||||
data_disk_count: usize,
|
||||
) -> Vec<u8> {
|
||||
let size = p_block.len();
|
||||
let mut reconstructed = vec![0u8; size];
|
||||
|
||||
for i in 0..data_disk_count {
|
||||
if i != missing_index {
|
||||
if let Some(data) = &data_blocks[i] {
|
||||
for j in 0..size {
|
||||
reconstructed[j] ^= data[j];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
for j in 0..size {
|
||||
reconstructed[j] ^= p_block[j];
|
||||
}
|
||||
|
||||
reconstructed
|
||||
}
|
||||
|
||||
fn reconstruct_from_pq(
|
||||
data_blocks: &[Option<Vec<u8>>],
|
||||
p_block: &[u8],
|
||||
q_block: &[u8],
|
||||
missing_index: usize,
|
||||
data_disk_count: usize,
|
||||
) -> Vec<u8> {
|
||||
Self::reconstruct_from_p(data_blocks, p_block, missing_index, data_disk_count)
|
||||
}
|
||||
|
||||
fn reconstruct_from_pqr(
|
||||
data_blocks: &[Option<Vec<u8>>],
|
||||
p_block: &[u8],
|
||||
q_block: &[u8],
|
||||
r_block: &[u8],
|
||||
missing_index: usize,
|
||||
data_disk_count: usize,
|
||||
) -> Vec<u8> {
|
||||
Self::reconstruct_from_p(data_blocks, p_block, missing_index, data_disk_count)
|
||||
}
|
||||
}
|
||||
|
||||
impl VfsBackend for VfsRaidBackend {
|
||||
|
||||
Reference in New Issue
Block a user