tape: add MediaCatalog implementation
This commit is contained in:
Dietmar Maurer
parent
a78348acbb
commit
205e187613
688
src/tape/media_catalog.rs
Normal file
688
src/tape/media_catalog.rs
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@ -0,0 +1,688 @@
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use std::convert::TryFrom;
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use std::fs::File;
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use std::io::{Write, Read, BufReader};
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use std::path::Path;
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use std::collections::HashMap;
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use anyhow::{bail, format_err, Error};
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use endian_trait::Endian;
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use proxmox::tools::{
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Uuid,
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fs::{
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fchown,
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create_path,
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CreateOptions,
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},
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io::{
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WriteExt,
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ReadExt,
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},
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};
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use crate::{
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backup::BackupDir,
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tape::drive::MediaLabelInfo,
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};
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/// The Media Catalog
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///
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/// Stores what chunks and snapshots are stored on a specific media,
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/// including the file position.
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///
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/// We use a simple binary format to store data on disk.
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pub struct MediaCatalog {
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uuid: Uuid, // BackupMedia uuid
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file: Option<File>,
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pub log_to_stdout: bool,
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current_archive: Option<(Uuid, u64)>,
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last_entry: Option<(Uuid, u64)>,
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chunk_index: HashMap<[u8;32], u64>,
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snapshot_index: HashMap<String, u64>,
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pending: Vec<u8>,
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}
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impl MediaCatalog {
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/// Test if a catalog exists
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pub fn exists(base_path: &Path, uuid: &Uuid) -> bool {
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let mut path = base_path.to_owned();
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path.push(uuid.to_string());
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path.set_extension("log");
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path.exists()
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}
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/// Destroy the media catalog (remove all files)
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pub fn destroy(base_path: &Path, uuid: &Uuid) -> Result<(), Error> {
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let mut path = base_path.to_owned();
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path.push(uuid.to_string());
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path.set_extension("log");
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match std::fs::remove_file(path) {
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Ok(()) => Ok(()),
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Err(err) if err.kind() == std::io::ErrorKind::NotFound => Ok(()),
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Err(err) => Err(err.into()),
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}
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}
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fn create_basedir(base_path: &Path) -> Result<(), Error> {
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let backup_user = crate::backup::backup_user()?;
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let mode = nix::sys::stat::Mode::from_bits_truncate(0o0640);
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let opts = CreateOptions::new()
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.perm(mode)
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.owner(backup_user.uid)
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.group(backup_user.gid);
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create_path(base_path, None, Some(opts))
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.map_err(|err: Error| format_err!("unable to create media catalog dir - {}", err))?;
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Ok(())
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}
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/// Open a catalog database, load into memory
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pub fn open(
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base_path: &Path,
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uuid: &Uuid,
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write: bool,
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create: bool,
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) -> Result<Self, Error> {
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let mut path = base_path.to_owned();
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path.push(uuid.to_string());
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path.set_extension("log");
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let me = proxmox::try_block!({
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Self::create_basedir(base_path)?;
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let mut file = std::fs::OpenOptions::new()
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.read(true)
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.write(write)
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.create(create)
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.open(&path)?;
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use std::os::unix::io::AsRawFd;
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let backup_user = crate::backup::backup_user()?;
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if let Err(err) = fchown(file.as_raw_fd(), Some(backup_user.uid), Some(backup_user.gid)) {
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bail!("fchown on media catalog {:?} failed - {}", path, err);
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}
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let mut me = Self {
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uuid: uuid.clone(),
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file: None,
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log_to_stdout: false,
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current_archive: None,
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last_entry: None,
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chunk_index: HashMap::new(),
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snapshot_index: HashMap::new(),
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pending: Vec::new(),
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};
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me.load_catalog(&mut file)?;
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if write {
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me.file = Some(file);
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}
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Ok(me)
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}).map_err(|err: Error| {
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format_err!("unable to open media catalog {:?} - {}", path, err)
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})?;
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Ok(me)
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}
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/// Creates a temporary, empty catalog database
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pub fn create_temporary_database(
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base_path: &Path,
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label_info: &MediaLabelInfo,
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log_to_stdout: bool,
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) -> Result<Self, Error> {
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Self::create_basedir(base_path)?;
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let uuid = &label_info.label.uuid;
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let mut tmp_path = base_path.to_owned();
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tmp_path.push(uuid.to_string());
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tmp_path.set_extension("tmp");
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let file = std::fs::OpenOptions::new()
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.read(true)
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.write(true)
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.create(true)
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.truncate(true)
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.open(&tmp_path)?;
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use std::os::unix::io::AsRawFd;
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let backup_user = crate::backup::backup_user()?;
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if let Err(err) = fchown(file.as_raw_fd(), Some(backup_user.uid), Some(backup_user.gid)) {
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bail!("fchown on media catalog {:?} failed - {}", tmp_path, err);
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}
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let mut me = Self {
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uuid: uuid.clone(),
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file: Some(file),
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log_to_stdout: false,
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current_archive: None,
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last_entry: None,
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chunk_index: HashMap::new(),
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snapshot_index: HashMap::new(),
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pending: Vec::new(),
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};
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me.log_to_stdout = log_to_stdout;
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me.register_label(&label_info.label_uuid, 0)?;
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if let Some((_, ref content_uuid)) = label_info.media_set_label {
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me.register_label(&content_uuid, 1)?;
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}
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me.commit()?;
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Ok(me)
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}
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/// Commit or Abort a temporary catalog database
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pub fn finish_temporary_database(
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base_path: &Path,
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uuid: &Uuid,
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commit: bool,
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) -> Result<(), Error> {
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let mut tmp_path = base_path.to_owned();
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tmp_path.push(uuid.to_string());
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tmp_path.set_extension("tmp");
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if commit {
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let mut catalog_path = tmp_path.clone();
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catalog_path.set_extension("log");
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if let Err(err) = std::fs::rename(&tmp_path, &catalog_path) {
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bail!("Atomic rename catalog {:?} failed - {}", catalog_path, err);
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}
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} else {
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std::fs::remove_file(&tmp_path)?;
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}
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Ok(())
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}
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/// Returns the BackupMedia uuid
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pub fn uuid(&self) -> &Uuid {
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&self.uuid
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}
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/// Accessor to content list
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pub fn snapshot_index(&self) -> &HashMap<String, u64> {
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&self.snapshot_index
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}
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/// Commit pending changes
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///
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/// This is necessary to store changes persistently.
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///
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/// Fixme: this should be atomic ...
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pub fn commit(&mut self) -> Result<(), Error> {
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if self.pending.is_empty() {
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return Ok(());
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}
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match self.file {
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Some(ref mut file) => {
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file.write_all(&self.pending)?;
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file.flush()?;
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file.sync_data()?;
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}
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None => bail!("media catalog not writable (opened read only)"),
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}
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self.pending = Vec::new();
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Ok(())
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}
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/// Conditionally commit if in pending data is large (> 1Mb)
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pub fn commit_if_large(&mut self) -> Result<(), Error> {
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if self.pending.len() > 1024*1024 {
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self.commit()?;
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}
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Ok(())
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}
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/// Destroy existing catalog, opens a new one
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pub fn overwrite(
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base_path: &Path,
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label_info: &MediaLabelInfo,
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log_to_stdout: bool,
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) -> Result<Self, Error> {
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let uuid = &label_info.label.uuid;
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let me = Self::create_temporary_database(base_path, &label_info, log_to_stdout)?;
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Self::finish_temporary_database(base_path, uuid, true)?;
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Ok(me)
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}
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/// Test if the catalog already contain a snapshot
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pub fn contains_snapshot(&self, snapshot: &str) -> bool {
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self.snapshot_index.contains_key(snapshot)
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}
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/// Returns the chunk archive file number
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pub fn lookup_snapshot(&self, snapshot: &str) -> Option<u64> {
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self.snapshot_index.get(snapshot).map(|n| *n)
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}
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/// Test if the catalog already contain a chunk
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pub fn contains_chunk(&self, digest: &[u8;32]) -> bool {
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self.chunk_index.contains_key(digest)
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}
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/// Returns the chunk archive file number
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pub fn lookup_chunk(&self, digest: &[u8;32]) -> Option<u64> {
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self.chunk_index.get(digest).map(|n| *n)
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}
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fn check_register_label(&self, file_number: u64) -> Result<(), Error> {
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if file_number >= 2 {
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bail!("register label failed: got wrong file number ({} >= 2)", file_number);
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}
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if self.current_archive.is_some() {
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bail!("register label failed: inside chunk archive");
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}
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let expected_file_number = match self.last_entry {
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Some((_, last_number)) => last_number + 1,
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None => 0,
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};
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if file_number != expected_file_number {
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bail!("register label failed: got unexpected file number ({} < {})",
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file_number, expected_file_number);
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}
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Ok(())
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}
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/// Register media labels (file 0 and 1)
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pub fn register_label(
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&mut self,
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uuid: &Uuid, // Uuid form MediaContentHeader
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file_number: u64,
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) -> Result<(), Error> {
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self.check_register_label(file_number)?;
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let entry = LabelEntry {
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file_number,
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uuid: *uuid.as_bytes(),
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};
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if self.log_to_stdout {
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println!("L|{}|{}", file_number, uuid.to_string());
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}
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self.pending.push(b'L');
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unsafe { self.pending.write_le_value(entry)?; }
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self.last_entry = Some((uuid.clone(), file_number));
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Ok(())
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}
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/// Register a chunk
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///
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/// Only valid after start_chunk_archive.
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pub fn register_chunk(
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&mut self,
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digest: &[u8;32],
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) -> Result<(), Error> {
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let file_number = match self.current_archive {
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None => bail!("register_chunk failed: no archive started"),
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Some((_, file_number)) => file_number,
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};
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if self.log_to_stdout {
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println!("C|{}", proxmox::tools::digest_to_hex(digest));
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}
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self.pending.push(b'C');
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self.pending.extend(digest);
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self.chunk_index.insert(*digest, file_number);
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Ok(())
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}
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fn check_start_chunk_archive(&self, file_number: u64) -> Result<(), Error> {
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if self.current_archive.is_some() {
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bail!("start_chunk_archive failed: already started");
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}
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if file_number < 2 {
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bail!("start_chunk_archive failed: got wrong file number ({} < 2)", file_number);
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}
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let expect_min_file_number = match self.last_entry {
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Some((_, last_number)) => last_number + 1,
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None => 0,
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};
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if file_number < expect_min_file_number {
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bail!("start_chunk_archive: got unexpected file number ({} < {})",
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file_number, expect_min_file_number);
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}
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Ok(())
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}
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/// Start a chunk archive section
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pub fn start_chunk_archive(
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&mut self,
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uuid: Uuid, // Uuid form MediaContentHeader
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file_number: u64,
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) -> Result<(), Error> {
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self.check_start_chunk_archive(file_number)?;
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let entry = ChunkArchiveStart {
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file_number,
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uuid: *uuid.as_bytes(),
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};
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if self.log_to_stdout {
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println!("A|{}|{}", file_number, uuid.to_string());
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}
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self.pending.push(b'A');
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unsafe { self.pending.write_le_value(entry)?; }
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self.current_archive = Some((uuid, file_number));
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Ok(())
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}
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fn check_end_chunk_archive(&self, uuid: &Uuid, file_number: u64) -> Result<(), Error> {
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match self.current_archive {
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None => bail!("end_chunk archive failed: not started"),
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Some((ref expected_uuid, expected_file_number)) => {
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if uuid != expected_uuid {
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bail!("end_chunk_archive failed: got unexpected uuid");
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}
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if file_number != expected_file_number {
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bail!("end_chunk_archive failed: got unexpected file number ({} != {})",
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file_number, expected_file_number);
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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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/// End a chunk archive section
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pub fn end_chunk_archive(&mut self) -> Result<(), Error> {
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match self.current_archive.take() {
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None => bail!("end_chunk_archive failed: not started"),
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Some((uuid, file_number)) => {
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let entry = ChunkArchiveEnd {
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file_number,
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uuid: *uuid.as_bytes(),
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};
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if self.log_to_stdout {
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println!("E|{}|{}\n", file_number, uuid.to_string());
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}
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self.pending.push(b'E');
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unsafe { self.pending.write_le_value(entry)?; }
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self.last_entry = Some((uuid, file_number));
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}
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}
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Ok(())
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}
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fn check_register_snapshot(&self, file_number: u64, snapshot: &str) -> Result<(), Error> {
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if self.current_archive.is_some() {
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bail!("register_snapshot failed: inside chunk_archive");
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}
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if file_number < 2 {
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bail!("register_snapshot failed: got wrong file number ({} < 2)", file_number);
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}
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let expect_min_file_number = match self.last_entry {
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Some((_, last_number)) => last_number + 1,
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None => 0,
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};
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if file_number < expect_min_file_number {
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bail!("register_snapshot failed: got unexpected file number ({} < {})",
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file_number, expect_min_file_number);
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}
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if let Err(err) = snapshot.parse::<BackupDir>() {
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bail!("register_snapshot failed: unable to parse snapshot '{}' - {}", snapshot, err);
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}
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Ok(())
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}
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/// Register a snapshot
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pub fn register_snapshot(
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&mut self,
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uuid: Uuid, // Uuid form MediaContentHeader
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file_number: u64,
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snapshot: &str,
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) -> Result<(), Error> {
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self.check_register_snapshot(file_number, snapshot)?;
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let entry = SnapshotEntry {
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file_number,
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uuid: *uuid.as_bytes(),
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name_len: u16::try_from(snapshot.len())?,
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};
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if self.log_to_stdout {
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println!("S|{}|{}|{}", file_number, uuid.to_string(), snapshot);
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}
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self.pending.push(b'S');
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unsafe { self.pending.write_le_value(entry)?; }
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self.pending.extend(snapshot.as_bytes());
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self.snapshot_index.insert(snapshot.to_string(), file_number);
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self.last_entry = Some((uuid, file_number));
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Ok(())
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}
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fn load_catalog(&mut self, file: &mut File) -> Result<(), Error> {
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let mut file = BufReader::new(file);
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loop {
|
||||
let mut entry_type = [0u8; 1];
|
||||
match file.read_exact_or_eof(&mut entry_type) {
|
||||
Ok(false) => { /* EOF */ break; }
|
||||
Ok(true) => { /* OK */ }
|
||||
Err(err) => bail!("read failed - {}", err),
|
||||
}
|
||||
|
||||
match entry_type[0] {
|
||||
b'C' => {
|
||||
let file_number = match self.current_archive {
|
||||
None => bail!("register_chunk failed: no archive started"),
|
||||
Some((_, file_number)) => file_number,
|
||||
};
|
||||
let mut digest = [0u8; 32];
|
||||
file.read_exact(&mut digest)?;
|
||||
self.chunk_index.insert(digest, file_number);
|
||||
}
|
||||
b'A' => {
|
||||
let entry: ChunkArchiveStart = unsafe { file.read_le_value()? };
|
||||
let file_number = entry.file_number;
|
||||
let uuid = Uuid::from(entry.uuid);
|
||||
|
||||
self.check_start_chunk_archive(file_number)?;
|
||||
|
||||
self.current_archive = Some((uuid, file_number));
|
||||
}
|
||||
b'E' => {
|
||||
let entry: ChunkArchiveEnd = unsafe { file.read_le_value()? };
|
||||
let file_number = entry.file_number;
|
||||
let uuid = Uuid::from(entry.uuid);
|
||||
|
||||
self.check_end_chunk_archive(&uuid, file_number)?;
|
||||
|
||||
self.current_archive = None;
|
||||
self.last_entry = Some((uuid, file_number));
|
||||
}
|
||||
b'S' => {
|
||||
let entry: SnapshotEntry = unsafe { file.read_le_value()? };
|
||||
let file_number = entry.file_number;
|
||||
let name_len = entry.name_len;
|
||||
let uuid = Uuid::from(entry.uuid);
|
||||
|
||||
let snapshot = file.read_exact_allocated(name_len.into())?;
|
||||
let snapshot = std::str::from_utf8(&snapshot)?;
|
||||
|
||||
self.check_register_snapshot(file_number, snapshot)?;
|
||||
|
||||
self.snapshot_index.insert(snapshot.to_string(), file_number);
|
||||
|
||||
self.last_entry = Some((uuid, file_number));
|
||||
}
|
||||
b'L' => {
|
||||
let entry: LabelEntry = unsafe { file.read_le_value()? };
|
||||
let file_number = entry.file_number;
|
||||
let uuid = Uuid::from(entry.uuid);
|
||||
|
||||
self.check_register_label(file_number)?;
|
||||
|
||||
self.last_entry = Some((uuid, file_number));
|
||||
}
|
||||
_ => {
|
||||
bail!("unknown entry type '{}'", entry_type[0]);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// Media set catalog
|
||||
///
|
||||
/// Catalog for multiple media.
|
||||
pub struct MediaSetCatalog {
|
||||
catalog_list: HashMap<Uuid, MediaCatalog>,
|
||||
}
|
||||
|
||||
impl MediaSetCatalog {
|
||||
|
||||
/// Creates a new instance
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
catalog_list: HashMap::new(),
|
||||
}
|
||||
}
|
||||
|
||||
/// Add a catalog
|
||||
pub fn append_catalog(&mut self, catalog: MediaCatalog) -> Result<(), Error> {
|
||||
|
||||
if self.catalog_list.get(&catalog.uuid).is_some() {
|
||||
bail!("MediaSetCatalog already contains media '{}'", catalog.uuid);
|
||||
}
|
||||
|
||||
self.catalog_list.insert(catalog.uuid.clone(), catalog);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Remove a catalog
|
||||
pub fn remove_catalog(&mut self, media_uuid: &Uuid) {
|
||||
self.catalog_list.remove(media_uuid);
|
||||
}
|
||||
|
||||
/// Test if the catalog already contain a snapshot
|
||||
pub fn contains_snapshot(&self, snapshot: &str) -> bool {
|
||||
for catalog in self.catalog_list.values() {
|
||||
if catalog.contains_snapshot(snapshot) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
false
|
||||
}
|
||||
|
||||
/// Test if the catalog already contain a chunk
|
||||
pub fn contains_chunk(&self, digest: &[u8;32]) -> bool {
|
||||
for catalog in self.catalog_list.values() {
|
||||
if catalog.contains_chunk(digest) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
false
|
||||
}
|
||||
}
|
||||
|
||||
// Type definitions for internal binary catalog encoding
|
||||
|
||||
#[derive(Endian)]
|
||||
#[repr(C)]
|
||||
pub struct LabelEntry {
|
||||
file_number: u64,
|
||||
uuid: [u8;16],
|
||||
}
|
||||
|
||||
#[derive(Endian)]
|
||||
#[repr(C)]
|
||||
pub struct ChunkArchiveStart {
|
||||
file_number: u64,
|
||||
uuid: [u8;16],
|
||||
}
|
||||
|
||||
#[derive(Endian)]
|
||||
#[repr(C)]
|
||||
pub struct ChunkArchiveEnd{
|
||||
file_number: u64,
|
||||
uuid: [u8;16],
|
||||
}
|
||||
|
||||
#[derive(Endian)]
|
||||
#[repr(C)]
|
||||
pub struct SnapshotEntry{
|
||||
file_number: u64,
|
||||
uuid: [u8;16],
|
||||
name_len: u16,
|
||||
/* snapshot name follows */
|
||||
}
|
||||
@ -1,3 +1,5 @@
|
||||
//! Magnetic tape backup
|
||||
|
||||
use anyhow::{format_err, Error};
|
||||
|
||||
use proxmox::tools::fs::{
|
||||
@ -34,6 +36,9 @@ pub use online_status_map::*;
|
||||
mod media_pool;
|
||||
pub use media_pool::*;
|
||||
|
||||
mod media_catalog;
|
||||
pub use media_catalog::*;
|
||||
|
||||
/// Directory path where we store all tape status information
|
||||
pub const TAPE_STATUS_DIR: &str = "/var/lib/proxmox-backup/tape";
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user