From: Shannon Sterz <s.sterz@proxmox.com>
To: pbs-devel@lists.proxmox.com
Subject: [pbs-devel] [PATCH proxmox-backup 3/4] fix #3935: datastore: move manifest locking to new locking method
Date: Mon, 10 Mar 2025 15:36:06 +0100 [thread overview]
Message-ID: <20250310143607.298339-4-s.sterz@proxmox.com> (raw)
In-Reply-To: <20250310143607.298339-1-s.sterz@proxmox.com>
adds double stat'ing and removes directory hierarchy to bring manifest
locking in-line with other locks used by the BackupDir trait.
Signed-off-by: Shannon Sterz <s.sterz@proxmox.com>
---
pbs-datastore/src/backup_info.rs | 34 ++++++++++++++++----------------
1 file changed, 17 insertions(+), 17 deletions(-)
diff --git a/pbs-datastore/src/backup_info.rs b/pbs-datastore/src/backup_info.rs
index 5496e053..4bfd4393 100644
--- a/pbs-datastore/src/backup_info.rs
+++ b/pbs-datastore/src/backup_info.rs
@@ -448,25 +448,28 @@ impl BackupDir {
/// Returns the filename to lock a manifest
///
/// Also creates the basedir. The lockfile is located in
- /// '/run/proxmox-backup/locks/{datastore}/[ns/{ns}/]+{type}/{id}/{timestamp}.index.json.lck'
- fn manifest_lock_path(&self) -> Result<PathBuf, Error> {
- let mut path = PathBuf::from(&format!("/run/proxmox-backup/locks/{}", self.store.name()));
- path.push(self.relative_path());
+ /// `${DATASTORE_LOCKS_DIR}/${datastore name}/${lock_file_path_helper(rpath)}.index.json.lck`
+ /// where rpath is the relative path of the snapshot.
+ fn manifest_lock_path(&self) -> PathBuf {
+ let path = Path::new(DATASTORE_LOCKS_DIR).join(self.store.name());
- std::fs::create_dir_all(&path)?;
- let ts = self.backup_time_string();
- path.push(format!("{ts}{MANIFEST_LOCK_NAME}"));
+ let rpath = Path::new(self.dir.group.ty.as_str())
+ .join(&self.dir.group.id)
+ .join(&self.backup_time_string)
+ .join(MANIFEST_LOCK_NAME);
- Ok(path)
+ path.join(lock_file_path_helper(&self.ns, rpath))
}
/// Locks the manifest of a snapshot, for example, to update or delete it.
pub(crate) fn lock_manifest(&self) -> Result<BackupLockGuard, Error> {
- let path = self.manifest_lock_path()?;
-
- // actions locking the manifest should be relatively short, only wait a few seconds
- open_backup_lockfile(&path, Some(std::time::Duration::from_secs(5)), true)
- .map_err(|err| format_err!("unable to acquire manifest lock {:?} - {}", &path, err))
+ lock_helper(self.store.name(), &self.manifest_lock_path(), |p| {
+ // update_manifest should never take a long time, so if
+ // someone else has the lock we can simply block a bit
+ // and should get it soon
+ open_backup_lockfile(p, Some(Duration::from_secs(5)), true)
+ .map_err(|err| format_err!("unable to acquire manifest lock {p:?} - {err}"))
+ })
}
/// Returns a file name for locking a snapshot.
@@ -521,10 +524,7 @@ impl BackupDir {
})?;
// remove no longer needed lock files
- if let Ok(path) = self.manifest_lock_path() {
- let _ = std::fs::remove_file(path); // ignore errors
- }
-
+ let _ = std::fs::remove_file(self.manifest_lock_path()); // ignore errors
let _ = std::fs::remove_file(self.lock_path()); // ignore errors
Ok(())
--
2.39.5
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next prev parent reply other threads:[~2025-03-10 14:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-10 14:36 [pbs-devel] [PATCH proxmox-backup 0/4] refactor datastore locking to use tmpfs Shannon Sterz
2025-03-10 14:36 ` [pbs-devel] [PATCH proxmox-backup 1/4] datastore/api/backup: prepare for fix of #3935 by adding lock helpers Shannon Sterz
2025-03-10 14:36 ` [pbs-devel] [PATCH proxmox-backup 2/4] fix #3935: datastore/api/backup: move datastore locking to '/run' Shannon Sterz
2025-03-10 14:36 ` Shannon Sterz [this message]
2025-03-10 14:36 ` [pbs-devel] [PATCH proxmox-backup 4/4] fix: api: avoid race condition in set_backup_owner Shannon Sterz
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