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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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8
src/api2/admin/datastore.rs
View File

@ -1481,11 +1481,9 @@ fn set_notes(
let allowed = (user_privs & PRIV_DATASTORE_READ) != 0;
if !allowed { check_backup_owner(&datastore, backup_dir.group(), &userid)?; }
let (mut manifest, _) = datastore.load_manifest(&backup_dir)?;
manifest.unprotected["notes"] = notes.into();
datastore.store_manifest(&backup_dir, manifest)?;
datastore.update_manifest(&backup_dir,|manifest| {
manifest.unprotected["notes"] = notes.into();
}).map_err(|err| format_err!("unable to update manifest blob - {}", err))?;
Ok(())
}