471 lines
14 KiB
Rust
471 lines
14 KiB
Rust
use failure::*;
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use std::path::{Path, PathBuf};
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use std::io::Write;
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use std::sync::{Arc, Mutex};
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use std::os::unix::io::AsRawFd;
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use proxmox::tools::fs::{CreateOptions, create_path, create_dir};
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use crate::tools;
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use crate::api2::types::GarbageCollectionStatus;
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use super::DataBlob;
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use crate::server::WorkerTask;
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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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locker: Arc<Mutex<tools::ProcessLocker>>,
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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: usize) -> Result<(), Error> {
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static SIZES: [usize; 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: &[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>(name: &str, path: P, uid: nix::unistd::Uid, gid: nix::unistd::Gid) -> Result<Self, Error>
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where
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P: Into<PathBuf>,
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{
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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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let options = CreateOptions::new()
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.owner(uid)
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.group(gid);
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let default_options = CreateOptions::new();
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if let Err(err) = create_path(&base, Some(default_options.clone()), Some(options.clone())) {
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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) = create_dir(&chunk_dir, options.clone()) {
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bail!("unable to create chunk store '{}' subdir {:?} - {}", name, chunk_dir, err);
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}
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// create lock file with correct owner/group
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let lockfile_path = Self::lockfile_path(&base);
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proxmox::tools::fs::replace_file(lockfile_path, b"", options.clone())?;
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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) = create_dir(&l1path, options.clone()) {
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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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fn lockfile_path<P: Into<PathBuf>>(base: P) -> PathBuf {
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let base: PathBuf = base.into();
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let mut lockfile_path = base.clone();
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lockfile_path.push(".lock");
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lockfile_path
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}
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pub fn open<P: Into<PathBuf>>(name: &str, base: P) -> Result<Self, Error> {
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let base: PathBuf = base.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 lockfile_path = Self::lockfile_path(&base);
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let locker = tools::ProcessLocker::new(&lockfile_path)?;
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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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locker,
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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; 32]) -> Result<(), Error> {
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self.cond_touch_chunk(digest, true)?;
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Ok(())
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}
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pub fn cond_touch_chunk(&self, digest: &[u8; 32], fail_if_not_exist: bool) -> Result<bool, Error> {
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let (chunk_path, _digest_str) = self.chunk_path(digest);
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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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let tmp = libc::utimensat(-1, cstr.as_ptr(), ×[0], libc::AT_SYMLINK_NOFOLLOW);
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nix::errno::Errno::result(tmp)
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})?;
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if let Err(err) = res {
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if !fail_if_not_exist && err.as_errno() == Some(nix::errno::Errno::ENOENT) {
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return Ok(false);
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}
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bail!("updata atime failed for chunk {:?} - {}", chunk_path, err);
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}
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Ok(true)
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}
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pub fn read_chunk(&self, digest: &[u8; 32]) -> Result<DataBlob, Error> {
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let (chunk_path, digest_str) = self.chunk_path(digest);
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let mut file = std::fs::File::open(&chunk_path)
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.map_err(|err| {
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format_err!(
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"store '{}', unable to read 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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DataBlob::load(&mut file)
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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>, usize)> + std::iter::FusedIterator,
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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 = Dir::open(&self.chunk_dir, OFlag::O_RDONLY, Mode::empty())
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.map_err(|err| {
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format_err!(
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"unable to open store '{}' chunk dir {:?} - {}",
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self.name,
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self.chunk_dir,
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err,
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)
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})?;
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let mut done = false;
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let mut inner: Option<tools::fs::ReadDir> = None;
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let mut at = 0;
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let mut percentage = 0;
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Ok(std::iter::from_fn(move || {
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if done {
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return None;
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}
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loop {
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if let Some(ref mut inner) = inner {
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match inner.next() {
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Some(Ok(entry)) => {
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// skip files if they're not a hash
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let bytes = entry.file_name().to_bytes();
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if bytes.len() != 64 {
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continue;
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}
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if !bytes.iter().all(u8::is_ascii_hexdigit) {
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continue;
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}
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return Some((Ok(entry), percentage));
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}
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Some(Err(err)) => {
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// stop after first error
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done = true;
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// and pass the error through:
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return Some((Err(err), percentage));
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}
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None => (), // open next directory
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}
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}
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inner = None;
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if at == 0x10000 {
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done = true;
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return None;
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}
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let subdir: &str = &format!("{:04x}", at);
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percentage = (at * 100) / 0x10000;
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at += 1;
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match tools::fs::read_subdir(base_handle.as_raw_fd(), subdir) {
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Ok(dir) => {
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inner = Some(dir);
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// start reading:
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continue;
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}
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Err(ref err) if err.as_errno() == Some(nix::errno::Errno::ENOENT) => {
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// non-existing directories are okay, just keep going:
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continue;
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}
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Err(err) => {
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// other errors are fatal, so end our iteration
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done = true;
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// and pass the error through:
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return Some((Err(format_err!("unable to read subdir '{}' - {}", subdir, err)), percentage));
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}
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}
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}
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}).fuse())
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}
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pub fn oldest_writer(&self) -> Option<i64> {
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tools::ProcessLocker::oldest_shared_lock(self.locker.clone())
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}
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pub fn sweep_unused_chunks(
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&self,
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oldest_writer: Option<i64>,
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status: &mut GarbageCollectionStatus,
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worker: Arc<WorkerTask>,
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) -> 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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let mut min_atime = now - 3600*24; // at least 24h (see mount option relatime)
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if let Some(stamp) = oldest_writer {
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if stamp < min_atime {
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min_atime = stamp;
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}
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}
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min_atime -= 300; // add 5 mins gap for safety
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let mut last_percentage = 0;
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let mut chunk_count = 0;
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for (entry, percentage) in self.get_chunk_iterator()? {
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if last_percentage != percentage {
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last_percentage = percentage;
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worker.log(format!("percentage done: {}, chunk count: {}", percentage, chunk_count));
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}
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tools::fail_on_shutdown()?;
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let (dirfd, entry) = match entry {
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Ok(entry) => (entry.parent_fd(), entry),
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Err(err) => bail!("chunk iterator on chunk store '{}' failed - {}", self.name, err),
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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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chunk_count += 1;
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let filename = entry.file_name();
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let lock = self.mutex.lock();
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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 stat.st_atime < min_atime {
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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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status.removed_chunks += 1;
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status.removed_bytes += stat.st_size as u64;
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} else {
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status.disk_chunks += 1;
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status.disk_bytes += stat.st_size as u64;
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}
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}
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drop(lock);
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}
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Ok(())
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}
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pub fn insert_chunk(
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&self,
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chunk: &DataBlob,
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digest: &[u8; 32],
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) -> Result<(bool, u64), Error> {
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//println!("DIGEST {}", proxmox::tools::digest_to_hex(digest));
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let (chunk_path, digest_str) = self.chunk_path(digest);
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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, metadata.len()));
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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 mut file = std::fs::File::create(&tmp_path)?;
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let raw_data = chunk.raw_data();
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let encoded_size = raw_data.len() as u64;
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file.write_all(raw_data)?;
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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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drop(lock);
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Ok((false, encoded_size))
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}
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pub fn chunk_path(&self, digest:&[u8; 32]) -> (PathBuf, String) {
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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 = proxmox::tools::digest_to_hex(digest);
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chunk_path.push(&digest_str);
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(chunk_path, digest_str)
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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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pub fn try_shared_lock(&self) -> Result<tools::ProcessLockSharedGuard, Error> {
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tools::ProcessLocker::try_shared_lock(self.locker.clone())
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}
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pub fn try_exclusive_lock(&self) -> Result<tools::ProcessLockExclusiveGuard, Error> {
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tools::ProcessLocker::try_exclusive_lock(self.locker.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 user = nix::unistd::User::from_uid(nix::unistd::Uid::current()).unwrap().unwrap();
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let chunk_store = ChunkStore::create("test", &path, user.uid, user.gid).unwrap();
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let (chunk, digest) = super::DataChunkBuilder::new(&[0u8, 1u8]).build().unwrap();
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let (exists, _) = chunk_store.insert_chunk(&chunk, &digest).unwrap();
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assert!(!exists);
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let (exists, _) = chunk_store.insert_chunk(&chunk, &digest).unwrap();
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assert!(exists);
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let chunk_store = ChunkStore::create("test", &path, user.uid, user.gid);
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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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