backup: check all referenced chunks actually exist
A client can omit uploading chunks in the "known_chunks" list, those then also won't be written on the server side. Check all those chunks mentioned in the index but not uploaded for existance and report an error if they don't exist instead of marking a potentially broken backup as "successful". This is only important if the base snapshot references corrupted chunks, but has not been negatively verified. Also, it is important to only verify this at the end, *after* all index writers are closed, since only then can it be guaranteed that no GC will sweep referenced chunks away. If a chunk is found missing, also mark the previous backup with a verification failure, since we know the missing chunk has to referenced in it (only way it could have been inserted to known_chunks with checked=false). This has the benefit of automatically doing a full-upload backup if the user attempts to retry after seeing the new error, instead of requiring a manual verify or forget. Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
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@ -9,7 +9,7 @@ use proxmox::tools::digest_to_hex;
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use proxmox::tools::fs::{replace_file, CreateOptions};
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use proxmox::api::{RpcEnvironment, RpcEnvironmentType};
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use crate::api2::types::Userid;
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use crate::api2::types::{Userid, SnapshotVerifyState};
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use crate::backup::*;
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use crate::server::WorkerTask;
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use crate::server::formatter::*;
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@ -66,13 +66,16 @@ struct FixedWriterState {
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incremental: bool,
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}
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// key=digest, value=(length, existance checked)
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type KnownChunksMap = HashMap<[u8;32], (u32, bool)>;
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struct SharedBackupState {
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finished: bool,
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uid_counter: usize,
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file_counter: usize, // successfully uploaded files
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dynamic_writers: HashMap<usize, DynamicWriterState>,
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fixed_writers: HashMap<usize, FixedWriterState>,
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known_chunks: HashMap<[u8;32], u32>,
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known_chunks: KnownChunksMap,
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backup_size: u64, // sums up size of all files
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backup_stat: UploadStatistic,
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}
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@ -153,7 +156,7 @@ impl BackupEnvironment {
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state.ensure_unfinished()?;
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state.known_chunks.insert(digest, length);
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state.known_chunks.insert(digest, (length, false));
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Ok(())
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}
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@ -195,7 +198,7 @@ impl BackupEnvironment {
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if is_duplicate { data.upload_stat.duplicates += 1; }
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// register chunk
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state.known_chunks.insert(digest, size);
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state.known_chunks.insert(digest, (size, true));
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Ok(())
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}
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@ -228,7 +231,7 @@ impl BackupEnvironment {
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if is_duplicate { data.upload_stat.duplicates += 1; }
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// register chunk
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state.known_chunks.insert(digest, size);
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state.known_chunks.insert(digest, (size, true));
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Ok(())
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}
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@ -237,7 +240,7 @@ impl BackupEnvironment {
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let state = self.state.lock().unwrap();
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match state.known_chunks.get(digest) {
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Some(len) => Some(*len),
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Some((len, _)) => Some(*len),
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None => None,
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}
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}
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@ -454,6 +457,47 @@ impl BackupEnvironment {
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Ok(())
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}
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/// Ensure all chunks referenced in this backup actually exist.
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/// Only call *after* all writers have been closed, to avoid race with GC.
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/// In case of error, mark the previous backup as 'verify failed'.
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fn verify_chunk_existance(&self, known_chunks: &KnownChunksMap) -> Result<(), Error> {
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for (digest, (_, checked)) in known_chunks.iter() {
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if !checked && !self.datastore.chunk_path(digest).0.exists() {
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let mark_msg = if let Some(ref last_backup) = self.last_backup {
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let last_dir = &last_backup.backup_dir;
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let verify_state = SnapshotVerifyState {
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state: "failed".to_owned(),
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upid: self.worker.upid().clone(),
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};
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let res = proxmox::try_block!{
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let (mut manifest, _) = self.datastore.load_manifest(last_dir)?;
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manifest.unprotected["verify_state"] = serde_json::to_value(verify_state)?;
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self.datastore.store_manifest(last_dir, serde_json::to_value(manifest)?)
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};
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if let Err(err) = res {
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format!("tried marking previous snapshot as bad, \
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but got error accessing manifest: {}", err)
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} else {
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"marked previous snapshot as bad, please use \
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'verify' for a detailed check".to_owned()
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}
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} else {
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"internal error: no base backup registered to mark invalid".to_owned()
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};
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bail!(
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"chunk '{}' was attempted to be reused but doesn't exist - {}",
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digest_to_hex(digest),
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mark_msg
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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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/// Mark backup as finished
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pub fn finish_backup(&self) -> Result<(), Error> {
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let mut state = self.state.lock().unwrap();
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@ -490,6 +534,8 @@ impl BackupEnvironment {
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}
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}
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self.verify_chunk_existance(&state.known_chunks)?;
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// marks the backup as successful
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state.finished = true;
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