[pbs-devel] [PATCH proxmox-backup v5 04/19] datastore: get per-chunk file lock for chunk rename on s3 backend

[Christian Ebner <c.ebner@proxmox.com>]

To guarantee exclusive access during s3 object store and cache
operations, acquire the per-chunk file before renaming a chunk when
the datastore is backed by s3.

This does not yet cover locking for the GC and chunk insert, part
of subsequent changes.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
 pbs-datastore/src/datastore.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index 905d709e7..a3c0f32aa 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -56,6 +56,8 @@ pub const GROUP_OWNER_FILE_NAME: &str = "owner";
 /// Filename for in-use marker stored on S3 object store backend
 pub const S3_DATASTORE_IN_USE_MARKER: &str = ".in-use";
 const NAMESPACE_MARKER_FILENAME: &str = ".namespace";
+// s3 put request times out after upload_size / 1 Kib/s, so about 2.3 hours for 8 MiB
+const CHUNK_LOCK_TIMEOUT: Duration = Duration::from_secs(3 * 60 * 60);
 
 /// checks if auth_id is owner, or, if owner is a token, if
 /// auth_id is the user of the token
@@ -2596,6 +2598,13 @@ impl DataStore {
     pub fn rename_corrupt_chunk(&self, digest: &[u8; 32]) -> Result<Option<PathBuf>, Error> {
         let (path, digest_str) = self.chunk_path(digest);
 
+        let _chunk_guard;
+        if let DatastoreBackendType::S3 = self.inner.backend_config.ty.unwrap_or_default() {
+            _chunk_guard = self
+                .inner
+                .chunk_store
+                .lock_chunk(digest, CHUNK_LOCK_TIMEOUT)?;
+        }
         let _lock = self.inner.chunk_store.mutex().lock().unwrap();
 
         let mut counter = 0;
-- 
2.47.3



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