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datastore: add manifest locking

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Avoid races when updating manifest data by flocking a lock file.
update_manifest is used to ensure updates always happen with the lock
held.

Snapshot deletion also acquires the lock, so it cannot interfere with an
outstanding manifest write.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
This commit is contained in:
Stefan Reiter
2020-10-16 09:31:12 +02:00
committed by Dietmar Maurer
parent e07620028d
commit 1a374fcfd6
5 changed files with 50 additions and 24 deletions
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13
src/api2/backup/environment.rs
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@ -472,16 +472,11 @@ impl BackupEnvironment {
bail!("backup does not contain valid files (file count == 0)");
}
// check manifest
let (mut manifest, _) = self.datastore.load_manifest(&self.backup_dir)
.map_err(|err| format_err!("unable to load manifest blob - {}", err))?;
// check for valid manifest and store stats
let stats = serde_json::to_value(state.backup_stat)?;
manifest.unprotected["chunk_upload_stats"] = stats;
self.datastore.store_manifest(&self.backup_dir, manifest)
.map_err(|err| format_err!("unable to store manifest blob - {}", err))?;
self.datastore.update_manifest(&self.backup_dir, |manifest| {
manifest.unprotected["chunk_upload_stats"] = stats;
}).map_err(|err| format_err!("unable to update manifest blob - {}", err))?;
if let Some(base) = &self.last_backup {
let path = self.datastore.snapshot_path(&base.backup_dir);