314 lines
9.1 KiB
Rust
314 lines
9.1 KiB
Rust
use anyhow::{anyhow, Result};
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use std::convert::TryInto;
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use std::fs::OpenOptions;
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use std::path::Path;
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use std::sync::Arc;
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use crate::cache::hint::Hint;
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use crate::cache::ir::{self, MetadataVisitor, Visit};
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use crate::cache::mapping::{Mapping, MappingFlags};
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use crate::cache::superblock::*;
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use crate::cache::xml;
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use crate::io_engine::*;
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use crate::math::*;
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use crate::pdata::array_builder::*;
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use crate::pdata::space_map_common::pack_root;
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use crate::pdata::space_map_metadata::*;
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use crate::report::*;
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use crate::write_batcher::*;
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//------------------------------------------
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const MAX_CONCURRENT_IO: u32 = 1024;
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//------------------------------------------
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pub struct CacheRestoreOptions<'a> {
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pub input: &'a Path,
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pub output: &'a Path,
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pub async_io: bool,
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pub report: Arc<Report>,
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}
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struct Context {
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_report: Arc<Report>,
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engine: Arc<dyn IoEngine + Send + Sync>,
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}
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fn mk_context(opts: &CacheRestoreOptions) -> anyhow::Result<Context> {
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let engine: Arc<dyn IoEngine + Send + Sync>;
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if opts.async_io {
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engine = Arc::new(AsyncIoEngine::new(opts.output, MAX_CONCURRENT_IO, true)?);
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} else {
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let nr_threads = std::cmp::max(8, num_cpus::get() * 2);
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engine = Arc::new(SyncIoEngine::new(opts.output, nr_threads, true)?);
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}
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Ok(Context {
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_report: opts.report.clone(),
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engine,
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})
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}
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//------------------------------------------
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#[derive(PartialEq)]
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enum Section {
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None,
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Superblock,
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Mappings,
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Hints,
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Finalized,
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}
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pub struct Restorer<'a> {
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write_batcher: &'a mut WriteBatcher,
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sb: Option<ir::Superblock>,
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mapping_builder: Option<ArrayBuilder<Mapping>>,
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dirty_builder: Option<ArrayBuilder<u64>>,
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hint_builder: Option<ArrayBuilder<Hint>>,
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mapping_root: Option<u64>,
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dirty_root: Option<u64>,
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hint_root: Option<u64>,
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discard_root: Option<u64>,
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dirty_bits: (u32, u64), // (index in u64 array, value)
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in_section: Section,
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}
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impl<'a> Restorer<'a> {
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pub fn new(w: &'a mut WriteBatcher) -> Restorer<'a> {
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Restorer {
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write_batcher: w,
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sb: None,
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mapping_builder: None,
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dirty_builder: None,
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hint_builder: None,
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mapping_root: None,
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dirty_root: None,
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hint_root: None,
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discard_root: None,
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dirty_bits: (0, 0),
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in_section: Section::None,
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}
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}
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fn finalize(&mut self) -> Result<()> {
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let src_sb;
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if let Some(sb) = self.sb.take() {
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src_sb = sb;
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} else {
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return Err(anyhow!("not in superblock"));
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}
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// complete the mapping array
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if let Some(builder) = self.mapping_builder.take() {
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self.mapping_root = Some(builder.complete(self.write_batcher)?);
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}
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// complete the dirty array
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if let Some(mut builder) = self.dirty_builder.take() {
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// push the bufferred trailing bits
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builder.push_value(
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self.write_batcher,
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self.dirty_bits.0 as u64,
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self.dirty_bits.1,
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)?;
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self.dirty_root = Some(builder.complete(self.write_batcher)?);
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}
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// complete the hint array
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if let Some(builder) = self.hint_builder.take() {
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self.hint_root = Some(builder.complete(self.write_batcher)?);
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}
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// build metadata space map
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let metadata_sm_root = build_metadata_sm(self.write_batcher)?;
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let mapping_root = self.mapping_root.as_ref().unwrap();
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let hint_root = self.hint_root.as_ref().unwrap();
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let discard_root = self.discard_root.as_ref().unwrap();
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let sb = Superblock {
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flags: SuperblockFlags {
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clean_shutdown: true,
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needs_check: false,
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},
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block: SUPERBLOCK_LOCATION,
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version: 2,
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policy_name: src_sb.policy.as_bytes().to_vec(),
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policy_version: vec![2, 0, 0],
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policy_hint_size: src_sb.hint_width,
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metadata_sm_root,
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mapping_root: *mapping_root,
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dirty_root: self.dirty_root, // dirty_root is optional
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hint_root: *hint_root,
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discard_root: *discard_root,
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discard_block_size: 0,
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discard_nr_blocks: 0,
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data_block_size: src_sb.block_size,
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cache_blocks: src_sb.nr_cache_blocks,
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compat_flags: 0,
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compat_ro_flags: 0,
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incompat_flags: 0,
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read_hits: 0,
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read_misses: 9,
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write_hits: 0,
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write_misses: 0,
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};
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write_superblock(self.write_batcher.engine.as_ref(), SUPERBLOCK_LOCATION, &sb)?;
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self.in_section = Section::Finalized;
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Ok(())
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}
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}
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impl<'a> MetadataVisitor for Restorer<'a> {
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fn superblock_b(&mut self, sb: &ir::Superblock) -> Result<Visit> {
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if self.in_section != Section::None {
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return Err(anyhow!("duplicated superblock"));
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}
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self.sb = Some(sb.clone());
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let b = self.write_batcher.alloc()?;
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if b.loc != SUPERBLOCK_LOCATION {
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return Err(anyhow!("superblock was occupied"));
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}
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self.mapping_builder = Some(ArrayBuilder::new(sb.nr_cache_blocks as u64));
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self.dirty_builder = Some(ArrayBuilder::new(div_up(sb.nr_cache_blocks as u64, 64)));
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self.hint_builder = Some(ArrayBuilder::new(sb.nr_cache_blocks as u64));
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let discard_builder = ArrayBuilder::<u64>::new(0); // discard bitset is optional
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self.discard_root = Some(discard_builder.complete(self.write_batcher)?);
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self.in_section = Section::Superblock;
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Ok(Visit::Continue)
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}
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fn superblock_e(&mut self) -> Result<Visit> {
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self.finalize()?;
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Ok(Visit::Continue)
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}
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fn mappings_b(&mut self) -> Result<Visit> {
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if self.in_section != Section::Superblock {
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return Err(anyhow!("not in superblock"));
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}
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self.in_section = Section::Mappings;
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Ok(Visit::Continue)
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}
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fn mappings_e(&mut self) -> Result<Visit> {
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if self.in_section != Section::Mappings {
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return Err(anyhow!("not in mappings"));
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}
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self.in_section = Section::Superblock;
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Ok(Visit::Continue)
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}
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fn mapping(&mut self, m: &ir::Map) -> Result<Visit> {
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let map = Mapping {
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oblock: m.oblock,
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flags: MappingFlags::Valid as u32,
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};
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let mapping_builder = self.mapping_builder.as_mut().unwrap();
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mapping_builder.push_value(self.write_batcher, m.cblock as u64, map)?;
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if m.dirty {
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let index = m.cblock >> 6;
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let mask = 1 << (m.cblock & 63);
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if index == self.dirty_bits.0 {
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self.dirty_bits.1 |= mask;
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} else {
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let dirty_builder = self.dirty_builder.as_mut().unwrap();
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dirty_builder.push_value(
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self.write_batcher,
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self.dirty_bits.0 as u64,
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self.dirty_bits.1,
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)?;
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self.dirty_bits.0 = index;
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self.dirty_bits.1 = 0;
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}
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}
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Ok(Visit::Continue)
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}
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fn hints_b(&mut self) -> Result<Visit> {
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if self.in_section != Section::Superblock {
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return Err(anyhow!("not in superblock"));
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}
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self.in_section = Section::Hints;
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Ok(Visit::Continue)
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}
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fn hints_e(&mut self) -> Result<Visit> {
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if self.in_section != Section::Hints {
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return Err(anyhow!("not in hints"));
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}
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self.in_section = Section::Superblock;
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Ok(Visit::Continue)
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}
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fn hint(&mut self, h: &ir::Hint) -> Result<Visit> {
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let hint = Hint {
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hint: h.data[..].try_into().unwrap(),
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};
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let hint_builder = self.hint_builder.as_mut().unwrap();
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hint_builder.push_value(self.write_batcher, h.cblock as u64, hint)?;
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Ok(Visit::Continue)
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}
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fn discards_b(&mut self) -> Result<Visit> {
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Ok(Visit::Continue)
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}
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fn discards_e(&mut self) -> Result<Visit> {
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Ok(Visit::Continue)
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}
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fn discard(&mut self, _d: &ir::Discard) -> Result<Visit> {
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Ok(Visit::Continue)
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}
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fn eof(&mut self) -> Result<Visit> {
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if self.in_section != Section::Finalized {
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return Err(anyhow!("incompleted source metadata"));
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}
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Ok(Visit::Continue)
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}
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}
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//------------------------------------------
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fn build_metadata_sm(w: &mut WriteBatcher) -> Result<Vec<u8>> {
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let r = write_metadata_sm(w)?;
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let sm_root = pack_root(&r, SPACE_MAP_ROOT_SIZE)?;
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Ok(sm_root)
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}
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//------------------------------------------
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pub fn restore(opts: CacheRestoreOptions) -> Result<()> {
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let input = OpenOptions::new()
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.read(true)
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.write(false)
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.open(opts.input)?;
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let ctx = mk_context(&opts)?;
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let sm = core_metadata_sm(ctx.engine.get_nr_blocks(), u32::MAX);
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let mut w = WriteBatcher::new(ctx.engine.clone(), sm.clone(), ctx.engine.get_batch_size());
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// build cache mappings
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let mut restorer = Restorer::new(&mut w);
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xml::read(input, &mut restorer)?;
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Ok(())
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}
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//------------------------------------------
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