tyler/proxmox-backup
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datastore: prevent in-use deletion with locks instead of heuristic

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Attempt to lock the backup directory to be deleted, if it works keep the
lock until the deletion is complete. This way we ensure that no other
locking operation (e.g. using a snapshot as base for another backup) can
happen concurrently.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
This commit is contained in:
Stefan Reiter 2020-08-11 10:50:38 +02:00 committed by Dietmar Maurer
parent e434258592
commit 6d6b4e72d3
1 changed files with 4 additions and 36 deletions
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40
src/backup/datastore.rs
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@ -11,7 +11,7 @@ use serde_json::Value;
use proxmox::tools::fs::{replace_file, CreateOptions};
use super::backup_info::{BackupGroup, BackupDir, BackupInfo};
use super::backup_info::{BackupGroup, BackupDir};
use super::chunk_store::ChunkStore;
use super::dynamic_index::{DynamicIndexReader, DynamicIndexWriter};
use super::fixed_index::{FixedIndexReader, FixedIndexWriter};
@ -200,19 +200,7 @@ impl DataStore {
let full_path = self.group_path(backup_group);
let mut snap_list = backup_group.list_backups(&self.base_path())?;
BackupInfo::sort_list(&mut snap_list, false);
for snap in snap_list {
if snap.is_finished() {
break;
} else {
bail!(
"cannot remove backup group {:?}, contains potentially running backup: {}",
full_path,
snap.backup_dir
);
}
}
let _guard = tools::fs::lock_dir_noblock(&full_path, "backup group", "possible running backup")?;
log::info!("removing backup group {:?}", full_path);
std::fs::remove_dir_all(&full_path)
@ -232,29 +220,9 @@ impl DataStore {
let full_path = self.snapshot_path(backup_dir);
let _guard;
if !force {
let mut snap_list = backup_dir.group().list_backups(&self.base_path())?;
BackupInfo::sort_list(&mut snap_list, false);
let mut prev_snap_finished = true;
for snap in snap_list {
let cur_snap_finished = snap.is_finished();
if &snap.backup_dir == backup_dir {
if !cur_snap_finished {
bail!(
"cannot remove currently running snapshot: {:?}",
backup_dir
);
}
if !prev_snap_finished {
bail!(
"cannot remove snapshot {:?}, successor is currently running and potentially based on it",
backup_dir
);
}
break;
}
prev_snap_finished = cur_snap_finished;
}
_guard = lock_dir_noblock(&full_path, "snapshot", "possibly running or used as base")?;
}
log::info!("removing backup snapshot {:?}", full_path);