forked from Deuxfleurs/garage
[refactor-block] refactor DataBlock and DataBlockPath
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parent
07c7895948
commit
cd1069c1d4
3 changed files with 88 additions and 78 deletions
src/block
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@ -13,77 +13,99 @@ pub enum DataBlockHeader {
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Compressed,
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Compressed,
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}
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}
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/// A possibly compressed block of data
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#[derive(Debug)]
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pub enum DataBlock {
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pub struct DataBlockElem<T> {
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/// Uncompressed data
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header: DataBlockHeader,
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Plain(Bytes),
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elem: T,
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/// Data compressed with zstd
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Compressed(Bytes),
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}
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}
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#[derive(Debug)]
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/// A possibly compressed block of data
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pub enum DataBlockPath {
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pub type DataBlock = DataBlockElem<Bytes>;
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/// Uncompressed data fail
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Plain(PathBuf),
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/// A path to a possibly compressed block of data
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/// Compressed data fail
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pub type DataBlockPath = DataBlockElem<PathBuf>;
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Compressed(PathBuf),
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impl DataBlockHeader {
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pub fn is_compressed(&self) -> bool {
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matches!(self, DataBlockHeader::Compressed)
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}
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}
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impl<T> DataBlockElem<T> {
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pub fn from_parts(header: DataBlockHeader, elem: T) -> Self {
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Self { header, elem }
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}
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pub fn plain(elem: T) -> Self {
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Self {
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header: DataBlockHeader::Plain,
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elem,
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}
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}
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pub fn compressed(elem: T) -> Self {
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Self {
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header: DataBlockHeader::Compressed,
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elem,
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}
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}
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pub fn into_parts(self) -> (DataBlockHeader, T) {
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(self.header, self.elem)
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}
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pub fn as_parts_ref(&self) -> (DataBlockHeader, &T) {
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(self.header, &self.elem)
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}
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/// Query whether this block is compressed
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pub fn is_compressed(&self) -> bool {
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self.header.is_compressed()
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}
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}
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}
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impl DataBlock {
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impl DataBlock {
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/// Query whether this block is compressed
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pub fn is_compressed(&self) -> bool {
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matches!(self, DataBlock::Compressed(_))
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}
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/// Get the inner, possibly compressed buffer. You should probably use [`DataBlock::verify_get`]
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/// Get the inner, possibly compressed buffer. You should probably use [`DataBlock::verify_get`]
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/// instead
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/// instead
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pub fn inner_buffer(&self) -> &[u8] {
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pub fn inner_buffer(&self) -> &[u8] {
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use DataBlock::*;
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&self.elem
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let (Plain(ref res) | Compressed(ref res)) = self;
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res
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}
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}
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/// Verify data integrity. Does not return the buffer content.
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/// Verify data integrity. Does not return the buffer content.
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pub fn verify(&self, hash: Hash) -> Result<(), Error> {
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pub fn verify(&self, hash: Hash) -> Result<(), Error> {
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match self {
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match self.header {
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DataBlock::Plain(data) => {
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DataBlockHeader::Plain => {
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if blake2sum(data) == hash {
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if blake2sum(&self.elem) == hash {
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Ok(())
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Ok(())
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} else {
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} else {
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Err(Error::CorruptData(hash))
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Err(Error::CorruptData(hash))
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}
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}
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}
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}
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DataBlock::Compressed(data) => zstd::stream::copy_decode(&data[..], std::io::sink())
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DataBlockHeader::Compressed => {
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.map_err(|_| Error::CorruptData(hash)),
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zstd::stream::copy_decode(&self.elem[..], std::io::sink())
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.map_err(|_| Error::CorruptData(hash))
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}
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}
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}
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}
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}
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pub async fn from_buffer(data: Bytes, level: Option<i32>) -> DataBlock {
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pub async fn from_buffer(data: Bytes, level: Option<i32>) -> DataBlock {
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tokio::task::spawn_blocking(move || {
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tokio::task::spawn_blocking(move || {
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if let Some(level) = level {
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if let Some(level) = level {
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if let Ok(data) = zstd_encode(&data[..], level) {
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if let Ok(data_compressed) = zstd_encode(&data[..], level) {
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return DataBlock::Compressed(data.into());
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return DataBlock {
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header: DataBlockHeader::Compressed,
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elem: data_compressed.into(),
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};
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}
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}
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}
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}
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DataBlock::Plain(data)
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DataBlock {
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header: DataBlockHeader::Plain,
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elem: data.into(),
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}
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})
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})
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.await
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.await
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.unwrap()
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.unwrap()
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}
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}
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pub fn into_parts(self) -> (DataBlockHeader, Bytes) {
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match self {
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DataBlock::Plain(data) => (DataBlockHeader::Plain, data),
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DataBlock::Compressed(data) => (DataBlockHeader::Compressed, data),
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}
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}
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pub fn from_parts(h: DataBlockHeader, bytes: Bytes) -> Self {
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match h {
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DataBlockHeader::Plain => DataBlock::Plain(bytes),
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DataBlockHeader::Compressed => DataBlock::Compressed(bytes),
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}
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}
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}
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}
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fn zstd_encode<R: std::io::Read>(mut source: R, level: i32) -> std::io::Result<Vec<u8>> {
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fn zstd_encode<R: std::io::Read>(mut source: R, level: i32) -> std::io::Result<Vec<u8>> {
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@ -547,10 +547,7 @@ impl BlockManager {
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hash: &Hash,
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hash: &Hash,
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block_path: &DataBlockPath,
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block_path: &DataBlockPath,
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) -> Result<DataBlock, Error> {
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) -> Result<DataBlock, Error> {
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let (path, compressed) = match block_path {
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let (header, path) = block_path.as_parts_ref();
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DataBlockPath::Plain(p) => (p, false),
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DataBlockPath::Compressed(p) => (p, true),
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};
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let mut f = fs::File::open(&path).await?;
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let mut f = fs::File::open(&path).await?;
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let mut data = vec![];
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let mut data = vec![];
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@ -558,11 +555,7 @@ impl BlockManager {
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self.metrics.bytes_read.add(data.len() as u64);
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self.metrics.bytes_read.add(data.len() as u64);
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drop(f);
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drop(f);
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let data = if compressed {
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let data = DataBlock::from_parts(header, data.into());
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DataBlock::Compressed(data.into())
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} else {
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DataBlock::Plain(data.into())
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};
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if data.verify(*hash).is_err() {
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if data.verify(*hash).is_err() {
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self.metrics.corruption_counter.add(1);
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self.metrics.corruption_counter.add(1);
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@ -615,20 +608,20 @@ impl BlockManager {
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// first and then a compressed one (as compression may have been
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// first and then a compressed one (as compression may have been
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// previously enabled).
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// previously enabled).
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if fs::metadata(&path).await.is_ok() {
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if fs::metadata(&path).await.is_ok() {
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return Some(DataBlockPath::Plain(path));
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return Some(DataBlockPath::plain(path));
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}
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}
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path.set_extension("zst");
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path.set_extension("zst");
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if fs::metadata(&path).await.is_ok() {
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if fs::metadata(&path).await.is_ok() {
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return Some(DataBlockPath::Compressed(path));
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return Some(DataBlockPath::compressed(path));
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}
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}
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} else {
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} else {
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path.set_extension("zst");
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path.set_extension("zst");
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if fs::metadata(&path).await.is_ok() {
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if fs::metadata(&path).await.is_ok() {
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return Some(DataBlockPath::Compressed(path));
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return Some(DataBlockPath::compressed(path));
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}
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}
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path.set_extension("");
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path.set_extension("");
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if fs::metadata(&path).await.is_ok() {
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if fs::metadata(&path).await.is_ok() {
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return Some(DataBlockPath::Plain(path));
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return Some(DataBlockPath::plain(path));
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}
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}
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}
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}
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}
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}
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@ -709,24 +702,25 @@ impl BlockManagerLocked {
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tgt_path.set_extension("zst");
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tgt_path.set_extension("zst");
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}
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}
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let to_delete = match (existing_path, compressed) {
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let existing_info = existing_path.map(|x| x.into_parts());
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let to_delete = match (existing_info, compressed) {
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// If the block is stored in the wrong directory,
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// If the block is stored in the wrong directory,
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// write it again at the correct path and delete the old path
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// write it again at the correct path and delete the old path
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(Some(DataBlockPath::Plain(p)), false) if p != tgt_path => Some(p),
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(Some((DataBlockHeader::Plain, p)), false) if p != tgt_path => Some(p),
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(Some(DataBlockPath::Compressed(p)), true) if p != tgt_path => Some(p),
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(Some((DataBlockHeader::Compressed, p)), true) if p != tgt_path => Some(p),
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// If the block is already stored not compressed but we have a compressed
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// If the block is already stored not compressed but we have a compressed
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// copy, write the compressed copy and delete the uncompressed one
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// copy, write the compressed copy and delete the uncompressed one
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(Some(DataBlockPath::Plain(plain_path)), true) => Some(plain_path),
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(Some((DataBlockHeader::Plain, plain_path)), true) => Some(plain_path),
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// If the block is already stored compressed,
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// If the block is already stored compressed,
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// keep the stored copy, we have nothing to do
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// keep the stored copy, we have nothing to do
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(Some(DataBlockPath::Compressed(_)), _) => return Ok(()),
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(Some((DataBlockHeader::Compressed, _)), _) => return Ok(()),
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// If the block is already stored not compressed,
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// If the block is already stored not compressed,
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// and we don't have a compressed copy either,
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// and we don't have a compressed copy either,
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// keep the stored copy, we have nothing to do
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// keep the stored copy, we have nothing to do
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(Some(DataBlockPath::Plain(_)), false) => return Ok(()),
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(Some((DataBlockHeader::Plain, _)), false) => return Ok(()),
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// If the block isn't stored already, just store what is given to us
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// If the block isn't stored already, just store what is given to us
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(None, _) => None,
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(None, _) => None,
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@ -778,18 +772,14 @@ impl BlockManagerLocked {
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}
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}
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async fn move_block_to_corrupted(&self, block_path: &DataBlockPath) -> Result<(), Error> {
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async fn move_block_to_corrupted(&self, block_path: &DataBlockPath) -> Result<(), Error> {
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let (path, path2) = match block_path {
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let (header, path) = block_path.as_parts_ref();
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DataBlockPath::Plain(p) => {
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let mut p2 = p.clone();
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let mut path2 = path.clone();
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p2.set_extension("corrupted");
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if header.is_compressed() {
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(p, p2)
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path2.set_extension("zst.corrupted");
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} else {
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path2.set_extension("corrupted");
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}
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}
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DataBlockPath::Compressed(p) => {
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let mut p2 = p.clone();
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p2.set_extension("zst.corrupted");
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(p, p2)
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}
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};
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fs::rename(path, path2).await?;
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fs::rename(path, path2).await?;
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Ok(())
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Ok(())
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@ -799,9 +789,7 @@ impl BlockManagerLocked {
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let rc = mgr.rc.get_block_rc(hash)?;
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let rc = mgr.rc.get_block_rc(hash)?;
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if rc.is_deletable() {
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if rc.is_deletable() {
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while let Some(path) = mgr.find_block(hash).await {
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while let Some(path) = mgr.find_block(hash).await {
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let path = match path {
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let (_header, path) = path.as_parts_ref();
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DataBlockPath::Plain(p) | DataBlockPath::Compressed(p) => p,
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};
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fs::remove_file(path).await?;
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fs::remove_file(path).await?;
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mgr.metrics.delete_counter.add(1);
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mgr.metrics.delete_counter.add(1);
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}
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}
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@ -584,8 +584,8 @@ impl Worker for RebalanceWorker {
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let prim_loc = self.manager.data_layout.load().primary_block_dir(&hash);
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let prim_loc = self.manager.data_layout.load().primary_block_dir(&hash);
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if path.ancestors().all(|x| x != prim_loc) {
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if path.ancestors().all(|x| x != prim_loc) {
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let block_path = match path.extension() {
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let block_path = match path.extension() {
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None => DataBlockPath::Plain(path.clone()),
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None => DataBlockPath::plain(path.clone()),
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Some(x) if x.to_str() == Some("zst") => DataBlockPath::Compressed(path.clone()),
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Some(x) if x.to_str() == Some("zst") => DataBlockPath::compressed(path.clone()),
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_ => {
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_ => {
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warn!("not rebalancing file: {}", path.to_string_lossy());
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warn!("not rebalancing file: {}", path.to_string_lossy());
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return Ok(WorkerState::Busy);
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return Ok(WorkerState::Busy);
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