Local refcounting of blocks

This commit is contained in:
Alex 2020-04-11 23:00:26 +02:00
parent dcf58499a4
commit 5dd59e437d
4 changed files with 119 additions and 41 deletions

View file

@ -1,25 +1,38 @@
use std::path::PathBuf;
use std::sync::Arc;
use tokio::fs;
use tokio::prelude::*;
use tokio::sync::Mutex;
use futures_util::future::*;
use crate::data::*;
use crate::error::Error;
use crate::proto::*;
use crate::server::Garage;
use crate::background::*;
fn block_dir(garage: &Garage, hash: &Hash) -> PathBuf {
let mut path = garage.system.config.data_dir.clone();
path.push(hex::encode(&hash.as_slice()[0..1]));
path.push(hex::encode(&hash.as_slice()[1..2]));
path
pub struct BlockManager {
pub data_dir: PathBuf,
pub rc: sled::Tree,
pub lock: Mutex<()>,
}
pub async fn write_block(garage: Arc<Garage>, hash: &Hash, data: &[u8]) -> Result<Message, Error> {
garage.fs_lock.lock().await;
impl BlockManager {
pub fn new(db: &sled::Db, data_dir: PathBuf) -> Self {
let rc = db.open_tree("block_local_rc")
.expect("Unable to open block_local_rc tree");
rc.set_merge_operator(rc_merge);
Self{
rc,
data_dir,
lock: Mutex::new(()),
}
}
let mut path = block_dir(&garage, hash);
pub async fn write_block(&self, hash: &Hash, data: &[u8]) -> Result<Message, Error> {
let _lock = self.lock.lock().await;
let mut path = self.block_dir(hash);
fs::create_dir_all(&path).await?;
path.push(hex::encode(hash));
@ -34,8 +47,8 @@ pub async fn write_block(garage: Arc<Garage>, hash: &Hash, data: &[u8]) -> Resul
Ok(Message::Ok)
}
pub async fn read_block(garage: Arc<Garage>, hash: &Hash) -> Result<Message, Error> {
let mut path = block_dir(&garage, hash);
pub async fn read_block(&self, hash: &Hash) -> Result<Message, Error> {
let mut path = self.block_dir(hash);
path.push(hex::encode(hash));
let mut f = fs::File::open(path).await?;
@ -47,3 +60,54 @@ pub async fn read_block(garage: Arc<Garage>, hash: &Hash) -> Result<Message, Err
data,
}))
}
fn block_dir(&self, hash: &Hash) -> PathBuf {
let mut path = self.data_dir.clone();
path.push(hex::encode(&hash.as_slice()[0..1]));
path.push(hex::encode(&hash.as_slice()[1..2]));
path
}
pub fn block_incref(&self, hash: &Hash) -> Result<(), Error> {
self.rc.merge(&hash, vec![1])?;
Ok(())
}
pub fn block_decref(&self, hash: &Hash, background: &BackgroundRunner) -> Result<(), Error> {
match self.rc.merge(&hash, vec![0])? {
None => {
let mut path = self.block_dir(hash);
path.push(hex::encode(hash));
background.spawn(tokio::fs::remove_file(path).map_err(Into::into));
Ok(())
}
Some(_) => Ok(())
}
}
}
fn rc_merge(_key: &[u8], old: Option<&[u8]>, new: &[u8]) -> Option<Vec<u8>> {
let old = old.map(|x| {
assert!(x.len() == 8);
let mut x8 = [0u8; 8];
x8.copy_from_slice(x);
u64::from_be_bytes(x8)
}).unwrap_or(0);
assert!(new.len() == 1);
let new = match new[0] {
0 => {
if old > 0 {
old - 1
} else {
0
}
}
1 => old + 1,
_ => unreachable!(),
};
if new == 0 {
None
} else {
Some(u64::to_be_bytes(new).to_vec())
}
}

View file

@ -45,7 +45,19 @@ impl TableFormat for BlockRefTable {
type E = BlockRef;
async fn updated(&self, old: Option<Self::E>, new: Self::E) {
//unimplemented!()
// TODO
let garage = self.garage.read().await.as_ref().cloned().unwrap();
let was_before = old.map(|x| !x.deleted).unwrap_or(false);
let is_after = !new.deleted;
if is_after && !was_before {
if let Err(e) = garage.block_manager.block_incref(&new.block) {
eprintln!("Failed to incref block {:?}: {}", &new.block, e);
}
}
if was_before && !is_after {
if let Err(e) = garage.block_manager.block_decref(&new.block, &garage.background) {
eprintln!("Failed to decref or delete block {:?}: {}", &new.block, e);
}
}
}
}

View file

@ -9,7 +9,6 @@ use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Method, Request, Response, Server, StatusCode};
use serde::Serialize;
use crate::block::*;
use crate::data::rmp_to_vec_all_named;
use crate::error::Error;
use crate::proto::Message;
@ -65,8 +64,8 @@ async fn handler(
Message::AdvertiseNodesUp(adv) => sys.handle_advertise_nodes_up(adv).await,
Message::AdvertiseConfig(adv) => sys.handle_advertise_config(adv).await,
Message::PutBlock(m) => write_block(garage, &m.hash, &m.data).await,
Message::GetBlock(h) => read_block(garage, &h).await,
Message::PutBlock(m) => garage.block_manager.write_block(&m.hash, &m.data).await,
Message::GetBlock(h) => garage.block_manager.read_block(&h).await,
Message::TableRPC(table, msg) => {
if let Some(rpc_handler) = garage.table_rpc_handlers.get(table) {

View file

@ -1,4 +1,4 @@
use futures_util::future::FutureExt;
pub use futures_util::future::FutureExt;
use serde::Deserialize;
use std::collections::HashMap;
use std::io::{Read, Write};
@ -6,11 +6,12 @@ use std::net::SocketAddr;
use std::path::PathBuf;
use std::sync::Arc;
use tokio::sync::watch;
use tokio::sync::{Mutex, RwLock};
use tokio::sync::RwLock;
use crate::api_server;
use crate::background::*;
use crate::data::*;
use crate::block::*;
use crate::error::Error;
use crate::membership::System;
use crate::proto::*;
@ -40,7 +41,7 @@ pub struct Config {
pub struct Garage {
pub db: sled::Db,
pub system: Arc<System>,
pub fs_lock: Mutex<()>,
pub block_manager: BlockManager,
pub background: Arc<BackgroundRunner>,
pub table_rpc_handlers: HashMap<String, Box<dyn TableRpcHandler + Sync + Send>>,
@ -57,6 +58,8 @@ impl Garage {
db: sled::Db,
background: Arc<BackgroundRunner>,
) -> Arc<Self> {
let block_manager = BlockManager::new(&db, config.data_dir.clone());
let system = Arc::new(System::new(config, id, background.clone()));
let meta_rep_param = TableReplicationParams {
@ -105,7 +108,7 @@ impl Garage {
let mut garage = Self {
db,
system: system.clone(),
fs_lock: Mutex::new(()),
block_manager,
background,
table_rpc_handlers: HashMap::new(),
object_table,