294 lines
8.5 KiB
Rust
294 lines
8.5 KiB
Rust
use anyhow::{anyhow, Result};
|
|
|
|
use std::convert::TryInto;
|
|
use std::fs::OpenOptions;
|
|
use std::io::Cursor;
|
|
use std::ops::Deref;
|
|
use std::path::Path;
|
|
use std::sync::Arc;
|
|
|
|
use crate::cache::hint::Hint;
|
|
use crate::cache::mapping::{Mapping, MappingFlags};
|
|
use crate::cache::superblock::*;
|
|
use crate::cache::xml::{self, MetadataVisitor, Visit};
|
|
use crate::io_engine::*;
|
|
use crate::math::*;
|
|
use crate::pdata::array_builder::*;
|
|
use crate::pdata::space_map::*;
|
|
use crate::pdata::space_map_metadata::*;
|
|
use crate::pdata::unpack::Pack;
|
|
use crate::report::*;
|
|
use crate::write_batcher::*;
|
|
|
|
//------------------------------------------
|
|
|
|
const MAX_CONCURRENT_IO: u32 = 1024;
|
|
|
|
//------------------------------------------
|
|
|
|
pub struct CacheRestoreOptions<'a> {
|
|
pub input: &'a Path,
|
|
pub output: &'a Path,
|
|
pub async_io: bool,
|
|
pub report: Arc<Report>,
|
|
}
|
|
|
|
struct Context {
|
|
_report: Arc<Report>,
|
|
engine: Arc<dyn IoEngine + Send + Sync>,
|
|
}
|
|
|
|
fn mk_context(opts: &CacheRestoreOptions) -> anyhow::Result<Context> {
|
|
let engine: Arc<dyn IoEngine + Send + Sync>;
|
|
|
|
if opts.async_io {
|
|
engine = Arc::new(AsyncIoEngine::new(opts.output, MAX_CONCURRENT_IO, true)?);
|
|
} else {
|
|
let nr_threads = std::cmp::max(8, num_cpus::get() * 2);
|
|
engine = Arc::new(SyncIoEngine::new(opts.output, nr_threads, true)?);
|
|
}
|
|
|
|
Ok(Context {
|
|
_report: opts.report.clone(),
|
|
engine,
|
|
})
|
|
}
|
|
|
|
//------------------------------------------
|
|
|
|
struct RestoreResult {
|
|
sb: xml::Superblock,
|
|
mapping_root: u64,
|
|
dirty_root: Option<u64>,
|
|
hint_root: u64,
|
|
discard_root: u64,
|
|
}
|
|
|
|
struct Restorer<'a> {
|
|
write_batcher: &'a mut WriteBatcher,
|
|
sb: Option<xml::Superblock>,
|
|
mapping_builder: Option<ArrayBuilder<Mapping>>,
|
|
dirty_builder: Option<ArrayBuilder<u64>>,
|
|
hint_builder: Option<ArrayBuilder<Hint>>,
|
|
mapping_root: Option<u64>,
|
|
dirty_root: Option<u64>,
|
|
hint_root: Option<u64>,
|
|
discard_root: Option<u64>,
|
|
dirty_bits: (u32, u64),
|
|
}
|
|
|
|
impl<'a> Restorer<'a> {
|
|
fn new(w: &'a mut WriteBatcher) -> Restorer<'a> {
|
|
Restorer {
|
|
write_batcher: w,
|
|
sb: None,
|
|
mapping_builder: None,
|
|
dirty_builder: None,
|
|
hint_builder: None,
|
|
mapping_root: None,
|
|
dirty_root: None,
|
|
hint_root: None,
|
|
discard_root: None,
|
|
dirty_bits: (0, 0),
|
|
}
|
|
}
|
|
|
|
fn get_result(self) -> Result<RestoreResult> {
|
|
self.write_batcher.flush()?;
|
|
|
|
if self.sb.is_none() || self.discard_root.is_none() {
|
|
return Err(anyhow!("No superblock found in xml file"));
|
|
}
|
|
if self.mapping_root.is_none() || self.hint_root.is_none() {
|
|
return Err(anyhow!("No mappings or hints sections in xml file"));
|
|
}
|
|
Ok(RestoreResult {
|
|
sb: self.sb.unwrap(),
|
|
mapping_root: self.mapping_root.unwrap(),
|
|
dirty_root: self.dirty_root,
|
|
hint_root: self.hint_root.unwrap(),
|
|
discard_root: self.discard_root.unwrap(),
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<'a> MetadataVisitor for Restorer<'a> {
|
|
fn superblock_b(&mut self, sb: &xml::Superblock) -> Result<Visit> {
|
|
self.sb = Some(sb.clone());
|
|
self.write_batcher.alloc()?;
|
|
self.mapping_builder = Some(ArrayBuilder::new(sb.nr_cache_blocks as u64));
|
|
self.dirty_builder = Some(ArrayBuilder::new(div_up(sb.nr_cache_blocks as u64, 64)));
|
|
self.hint_builder = Some(ArrayBuilder::new(sb.nr_cache_blocks as u64));
|
|
|
|
let discard_builder = ArrayBuilder::<u64>::new(0); // discard bitset is optional
|
|
self.discard_root = Some(discard_builder.complete(self.write_batcher)?);
|
|
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn superblock_e(&mut self) -> Result<Visit> {
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn mappings_b(&mut self) -> Result<Visit> {
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn mappings_e(&mut self) -> Result<Visit> {
|
|
let mut mapping_builder = None;
|
|
std::mem::swap(&mut self.mapping_builder, &mut mapping_builder);
|
|
if let Some(builder) = mapping_builder {
|
|
self.mapping_root = Some(builder.complete(self.write_batcher)?);
|
|
}
|
|
|
|
// push the bufferred trailing bits
|
|
let b = self.dirty_builder.as_mut().unwrap();
|
|
b.push_value(
|
|
self.write_batcher,
|
|
self.dirty_bits.0 as u64,
|
|
self.dirty_bits.1,
|
|
)?;
|
|
|
|
let mut dirty_builder = None;
|
|
std::mem::swap(&mut self.dirty_builder, &mut dirty_builder);
|
|
if let Some(builder) = dirty_builder {
|
|
self.dirty_root = Some(builder.complete(self.write_batcher)?);
|
|
}
|
|
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn mapping(&mut self, m: &xml::Map) -> Result<Visit> {
|
|
let map = Mapping {
|
|
oblock: m.oblock,
|
|
flags: MappingFlags::Valid as u32,
|
|
};
|
|
let mapping_builder = self.mapping_builder.as_mut().unwrap();
|
|
mapping_builder.push_value(self.write_batcher, m.cblock as u64, map)?;
|
|
|
|
if m.dirty {
|
|
let index = m.cblock >> 6;
|
|
let bi = m.cblock & 63;
|
|
if index == self.dirty_bits.0 {
|
|
self.dirty_bits.1 |= 1 << bi;
|
|
} else {
|
|
let dirty_builder = self.dirty_builder.as_mut().unwrap();
|
|
dirty_builder.push_value(
|
|
self.write_batcher,
|
|
self.dirty_bits.0 as u64,
|
|
self.dirty_bits.1,
|
|
)?;
|
|
self.dirty_bits.0 = index;
|
|
self.dirty_bits.1 = 0;
|
|
}
|
|
}
|
|
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn hints_b(&mut self) -> Result<Visit> {
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn hints_e(&mut self) -> Result<Visit> {
|
|
let mut hint_builder = None;
|
|
std::mem::swap(&mut self.hint_builder, &mut hint_builder);
|
|
if let Some(builder) = hint_builder {
|
|
self.hint_root = Some(builder.complete(self.write_batcher)?);
|
|
}
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn hint(&mut self, h: &xml::Hint) -> Result<Visit> {
|
|
let hint = Hint {
|
|
hint: h.data[..].try_into().unwrap(),
|
|
};
|
|
let hint_builder = self.hint_builder.as_mut().unwrap();
|
|
hint_builder.push_value(self.write_batcher, h.cblock as u64, hint)?;
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn discards_b(&mut self) -> Result<Visit> {
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn discards_e(&mut self) -> Result<Visit> {
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn discard(&mut self, _d: &xml::Discard) -> Result<Visit> {
|
|
Ok(Visit::Continue)
|
|
}
|
|
|
|
fn eof(&mut self) -> Result<Visit> {
|
|
Ok(Visit::Continue)
|
|
}
|
|
}
|
|
|
|
//------------------------------------------
|
|
|
|
fn build_metadata_sm(w: &mut WriteBatcher) -> Result<Vec<u8>> {
|
|
let mut sm_root = vec![0u8; SPACE_MAP_ROOT_SIZE];
|
|
let mut cur = Cursor::new(&mut sm_root);
|
|
let sm_without_meta = clone_space_map(w.sm.lock().unwrap().deref())?;
|
|
let r = write_metadata_sm(w, sm_without_meta.deref())?;
|
|
r.pack(&mut cur)?;
|
|
|
|
Ok(sm_root)
|
|
}
|
|
|
|
//------------------------------------------
|
|
|
|
pub fn restore(opts: CacheRestoreOptions) -> Result<()> {
|
|
let input = OpenOptions::new()
|
|
.read(true)
|
|
.write(false)
|
|
.open(opts.input)?;
|
|
|
|
let ctx = mk_context(&opts)?;
|
|
|
|
let sm = core_sm(ctx.engine.get_nr_blocks(), u32::MAX);
|
|
let mut w = WriteBatcher::new(ctx.engine.clone(), sm.clone(), ctx.engine.get_batch_size());
|
|
|
|
// build cache mappings
|
|
let mut restorer = Restorer::new(&mut w);
|
|
xml::read(input, &mut restorer)?;
|
|
let result = restorer.get_result()?;
|
|
|
|
// build metadata space map
|
|
let metadata_sm_root = build_metadata_sm(&mut w)?;
|
|
|
|
let sb = Superblock {
|
|
flags: SuperblockFlags {
|
|
clean_shutdown: true,
|
|
needs_check: false,
|
|
},
|
|
block: SUPERBLOCK_LOCATION,
|
|
version: 2,
|
|
policy_name: result.sb.policy.as_bytes().to_vec(),
|
|
policy_version: vec![2, 0, 0],
|
|
policy_hint_size: result.sb.hint_width,
|
|
metadata_sm_root,
|
|
mapping_root: result.mapping_root,
|
|
dirty_root: result.dirty_root,
|
|
hint_root: result.hint_root,
|
|
discard_root: result.discard_root,
|
|
discard_block_size: 0,
|
|
discard_nr_blocks: 0,
|
|
data_block_size: result.sb.block_size,
|
|
cache_blocks: result.sb.nr_cache_blocks,
|
|
compat_flags: 0,
|
|
compat_ro_flags: 0,
|
|
incompat_flags: 0,
|
|
read_hits: 0,
|
|
read_misses: 9,
|
|
write_hits: 0,
|
|
write_misses: 0,
|
|
};
|
|
write_superblock(ctx.engine.as_ref(), SUPERBLOCK_LOCATION, &sb)?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
//------------------------------------------
|