387 lines
11 KiB
Rust
387 lines
11 KiB
Rust
use failure::*;
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use std::path::{Path, PathBuf};
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use std::io::{Read, Write};
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use std::time::Duration;
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use openssl::sha;
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use std::sync::Mutex;
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use std::fs::File;
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use std::os::unix::io::AsRawFd;
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use crate::tools;
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pub struct GarbageCollectionStatus {
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pub used_bytes: usize,
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pub used_chunks: usize,
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pub disk_bytes: usize,
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pub disk_chunks: usize,
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}
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impl Default for GarbageCollectionStatus {
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fn default() -> Self {
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GarbageCollectionStatus {
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used_bytes: 0,
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used_chunks: 0,
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disk_bytes: 0,
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disk_chunks: 0,
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}
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}
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}
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/// File system based chunk store
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pub struct ChunkStore {
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name: String, // used for error reporting
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pub (crate) base: PathBuf,
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chunk_dir: PathBuf,
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mutex: Mutex<bool>,
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_lockfile: File,
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}
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// TODO: what about sysctl setting vm.vfs_cache_pressure (0 - 100) ?
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pub fn verify_chunk_size(size: u64) -> Result<(), Error> {
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static SIZES: [u64; 7] = [64*1024, 128*1024, 256*1024, 512*1024, 1024*1024, 2048*1024, 4096*1024];
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if !SIZES.contains(&size) {
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bail!("Got unsupported chunk size '{}'", size);
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}
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Ok(())
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}
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fn digest_to_prefix(digest: &[u8]) -> PathBuf {
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let mut buf = Vec::<u8>::with_capacity(2+1+2+1);
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const HEX_CHARS: &'static [u8; 16] = b"0123456789abcdef";
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buf.push(HEX_CHARS[(digest[0] as usize) >> 4]);
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buf.push(HEX_CHARS[(digest[0] as usize) &0xf]);
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buf.push(HEX_CHARS[(digest[1] as usize) >> 4]);
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buf.push(HEX_CHARS[(digest[1] as usize) & 0xf]);
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buf.push('/' as u8);
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let path = unsafe { String::from_utf8_unchecked(buf)};
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path.into()
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}
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impl ChunkStore {
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fn chunk_dir<P: AsRef<Path>>(path: P) -> PathBuf {
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let mut chunk_dir: PathBuf = PathBuf::from(path.as_ref());
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chunk_dir.push(".chunks");
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chunk_dir
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}
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pub fn create<P: Into<PathBuf>>(name: &str, path: P) -> Result<Self, Error> {
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let base: PathBuf = path.into();
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if !base.is_absolute() {
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bail!("expected absolute path - got {:?}", base);
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}
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let chunk_dir = Self::chunk_dir(&base);
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if let Err(err) = std::fs::create_dir(&base) {
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bail!("unable to create chunk store '{}' at {:?} - {}", name, base, err);
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}
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if let Err(err) = std::fs::create_dir(&chunk_dir) {
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bail!("unable to create chunk store '{}' subdir {:?} - {}", name, chunk_dir, err);
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}
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// create 64*1024 subdirs
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let mut last_percentage = 0;
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for i in 0..64*1024 {
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let mut l1path = chunk_dir.clone();
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l1path.push(format!("{:04x}", i));
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if let Err(err) = std::fs::create_dir(&l1path) {
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bail!("unable to create chunk store '{}' subdir {:?} - {}", name, l1path, err);
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}
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let percentage = (i*100)/(64*1024);
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if percentage != last_percentage {
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eprintln!("Percentage done: {}", percentage);
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last_percentage = percentage;
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}
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}
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Self::open(name, base)
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}
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pub fn open<P: Into<PathBuf>>(name: &str, path: P) -> Result<Self, Error> {
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let base: PathBuf = path.into();
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if !base.is_absolute() {
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bail!("expected absolute path - got {:?}", base);
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}
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let chunk_dir = Self::chunk_dir(&base);
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if let Err(err) = std::fs::metadata(&chunk_dir) {
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bail!("unable to open chunk store '{}' at {:?} - {}", name, chunk_dir, err);
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}
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let mut lockfile_path = base.clone();
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lockfile_path.push(".lock");
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// make sure only one process/thread/task can use it
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let lockfile = tools::open_file_locked(
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lockfile_path, Duration::from_secs(10))?;
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Ok(ChunkStore {
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name: name.to_owned(),
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base,
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chunk_dir,
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_lockfile: lockfile,
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mutex: Mutex::new(false)
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})
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}
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pub fn touch_chunk(&self, digest:&[u8]) -> Result<(), Error> {
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let mut chunk_path = self.chunk_dir.clone();
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let prefix = digest_to_prefix(&digest);
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chunk_path.push(&prefix);
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let digest_str = tools::digest_to_hex(&digest);
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chunk_path.push(&digest_str);
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const UTIME_NOW: i64 = ((1 << 30) - 1);
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const UTIME_OMIT: i64 = ((1 << 30) - 2);
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let times: [libc::timespec; 2] = [
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libc::timespec { tv_sec: 0, tv_nsec: UTIME_NOW },
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libc::timespec { tv_sec: 0, tv_nsec: UTIME_OMIT }
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];
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use nix::NixPath;
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let res = chunk_path.with_nix_path(|cstr| unsafe {
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libc::utimensat(-1, cstr.as_ptr(), ×[0], libc::AT_SYMLINK_NOFOLLOW)
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})?;
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if let Err(err) = nix::errno::Errno::result(res) {
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bail!("updata atime failed for chunk {:?} - {}", chunk_path, err);
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}
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Ok(())
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}
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pub fn read_chunk(&self, digest:&[u8], buffer: &mut Vec<u8>) -> Result<(), Error> {
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let mut chunk_path = self.chunk_dir.clone();
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let prefix = digest_to_prefix(&digest);
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chunk_path.push(&prefix);
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let digest_str = tools::digest_to_hex(&digest);
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chunk_path.push(&digest_str);
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let f = std::fs::File::open(&chunk_path)?;
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let mut decoder = lz4::Decoder::new(f)?;
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decoder.read_to_end(buffer)?;
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Ok(())
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}
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pub fn get_chunk_iterator(
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&self,
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) -> Result<
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impl Iterator<Item = Result<tools::fs::ReadDirEntry, Error>>,
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Error
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> {
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use nix::dir::Dir;
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use nix::fcntl::OFlag;
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use nix::sys::stat::Mode;
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let base_handle = match Dir::open(
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&self.chunk_dir, OFlag::O_RDONLY, Mode::empty()) {
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Ok(h) => h,
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Err(err) => bail!("unable to open store '{}' chunk dir {:?} - {}",
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self.name, self.chunk_dir, err),
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};
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let mut verbose = true;
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let mut last_percentage = 0;
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Ok((0..0x10000).filter_map(move |index| {
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let percentage = (index * 100) / 0x10000;
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if last_percentage != percentage {
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last_percentage = percentage;
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eprintln!("percentage done: {}", percentage);
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}
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let subdir: &str = &format!("{:04x}", index);
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match tools::fs::read_subdir(base_handle.as_raw_fd(), subdir) {
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Err(e) => {
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if verbose {
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eprintln!("Error iterating through chunks: {}", e);
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verbose = false;
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}
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None
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}
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Ok(iter) => Some(iter),
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}
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})
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.flatten()
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.filter(|entry| {
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// Check that the file name is actually a hash! (64 hex digits)
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let entry = match entry {
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Err(_) => return true, // pass errors onwards
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Ok(ref entry) => entry,
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};
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let bytes = entry.file_name().to_bytes();
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if bytes.len() != 64 {
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return false;
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}
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for b in bytes {
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if !b.is_ascii_hexdigit() {
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return false;
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}
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}
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true
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}))
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}
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pub fn sweep_unused_chunks(&self, status: &mut GarbageCollectionStatus) -> Result<(), Error> {
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use nix::sys::stat::fstatat;
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let now = unsafe { libc::time(std::ptr::null_mut()) };
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for entry in self.get_chunk_iterator()? {
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let (dirfd, entry) = match entry {
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Ok(entry) => (entry.parent_fd(), entry),
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Err(_) => continue, // ignore errors
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};
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let file_type = match entry.file_type() {
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Some(file_type) => file_type,
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None => bail!("unsupported file system type on chunk store '{}'", self.name),
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};
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if file_type != nix::dir::Type::File {
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continue;
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}
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let filename = entry.file_name();
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if let Ok(stat) = fstatat(dirfd, filename, nix::fcntl::AtFlags::AT_SYMLINK_NOFOLLOW) {
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let age = now - stat.st_atime;
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//println!("FOUND {} {:?}", age/(3600*24), filename);
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if age/(3600*24) >= 2 {
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println!("UNLINK {} {:?}", age/(3600*24), filename);
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let res = unsafe { libc::unlinkat(dirfd, filename.as_ptr(), 0) };
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if res != 0 {
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let err = nix::Error::last();
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bail!(
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"unlink chunk {:?} failed on store '{}' - {}",
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filename,
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self.name,
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err,
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);
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}
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} else {
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status.disk_chunks += 1;
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status.disk_bytes += stat.st_size as usize;
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}
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}
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}
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Ok(())
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}
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pub fn insert_chunk(&self, chunk: &[u8]) -> Result<(bool, [u8; 32]), Error> {
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// fixme: use Sha512/256 when available
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let mut hasher = sha::Sha256::new();
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hasher.update(chunk);
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let digest = hasher.finish();
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//println!("DIGEST {}", tools::digest_to_hex(&digest));
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let mut chunk_path = self.chunk_dir.clone();
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let prefix = digest_to_prefix(&digest);
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chunk_path.push(&prefix);
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let digest_str = tools::digest_to_hex(&digest);
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chunk_path.push(&digest_str);
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let lock = self.mutex.lock();
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if let Ok(metadata) = std::fs::metadata(&chunk_path) {
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if metadata.is_file() {
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return Ok((true, digest));
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} else {
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bail!("Got unexpected file type on store '{}' for chunk {}", self.name, digest_str);
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}
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}
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let mut tmp_path = chunk_path.clone();
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tmp_path.set_extension("tmp");
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let f = std::fs::File::create(&tmp_path)?;
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// fixme: what is the fasted lz4 encoder available (see lzbench)?
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let mut encoder = lz4::EncoderBuilder::new().level(1).build(f)?;
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encoder.write_all(chunk)?;
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let (_, encode_result) = encoder.finish();
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encode_result?;
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if let Err(err) = std::fs::rename(&tmp_path, &chunk_path) {
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if let Err(_) = std::fs::remove_file(&tmp_path) { /* ignore */ }
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bail!(
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"Atomic rename on store '{}' failed for chunk {} - {}",
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self.name,
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digest_str,
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err,
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);
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}
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//println!("PATH {:?}", chunk_path);
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drop(lock);
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Ok((false, digest))
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}
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pub fn relative_path(&self, path: &Path) -> PathBuf {
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let mut full_path = self.base.clone();
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full_path.push(path);
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full_path
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}
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pub fn base_path(&self) -> PathBuf {
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self.base.clone()
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}
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}
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#[test]
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fn test_chunk_store1() {
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let mut path = std::fs::canonicalize(".").unwrap(); // we need absulute path
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path.push(".testdir");
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if let Err(_e) = std::fs::remove_dir_all(".testdir") { /* ignore */ }
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let chunk_store = ChunkStore::open("test", &path);
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assert!(chunk_store.is_err());
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let chunk_store = ChunkStore::create("test", &path).unwrap();
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let (exists, _) = chunk_store.insert_chunk(&[0u8, 1u8]).unwrap();
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assert!(!exists);
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let (exists, _) = chunk_store.insert_chunk(&[0u8, 1u8]).unwrap();
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assert!(exists);
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let chunk_store = ChunkStore::create("test", &path);
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assert!(chunk_store.is_err());
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if let Err(_e) = std::fs::remove_dir_all(".testdir") { /* ignore */ }
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}
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