[PATCH proxmox v4 01/14] pbs-api-types: add datastore create maintenance-mode type

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

Datastore creation can take some time, especially for stores located
on network attached filesystems or datastores backed by S3.

Therefore, add a maintenance-mode type `create`, which will be used to
block access to the datastore while it is being created, without the
need to hold the datasore configuration lock for the whole
construction period. Rather the maintenance-mode will be locked until
the operation is completed or failed.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
 pbs-api-types/src/datastore.rs   | 8 ++++++++
 pbs-api-types/src/maintenance.rs | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/pbs-api-types/src/datastore.rs b/pbs-api-types/src/datastore.rs
index 7643b0de..89ec4dbf 100644
--- a/pbs-api-types/src/datastore.rs
+++ b/pbs-api-types/src/datastore.rs
@@ -658,6 +658,14 @@ impl DataStoreConfig {
                     }
                 }
             }
+            Some(MaintenanceType::Create) => {
+                match new_type {
+                    Some(MaintenanceType::Delete) => { /* allows deletion if creation failed */ }
+                    Some(MaintenanceType::S3Refresh) => { /* refresh from s3 during creation */ }
+                    None => { /* switch to regular operation after successful creation */ }
+                    _ => bail!("datastore is being created or creation failed"),
+                }
+            }
             #[cfg(feature = "enum-fallback")]
             Some(MaintenanceType::UnknownEnumValue(s)) => {
                 bail!("unknown maintenance type: {s}")
diff --git a/pbs-api-types/src/maintenance.rs b/pbs-api-types/src/maintenance.rs
index 2adb5d84..d6bb8308 100644
--- a/pbs-api-types/src/maintenance.rs
+++ b/pbs-api-types/src/maintenance.rs
@@ -44,6 +44,8 @@ pub enum MaintenanceType {
     //  - Add "GarbageCollection" or "DeleteOnly" as type and track GC (or all deletes) as separate
     //    operation, so that one can enable a mode where nothing new can be added but stuff can be
     //    cleaned
+    /// The datastore is being created
+    Create,
     /// Only read operations are allowed on the datastore.
     ReadOnly,
     /// Neither read nor write operations are allowed on the datastore.
@@ -96,6 +98,8 @@ impl MaintenanceMode {
     pub fn check(&self, operation: Operation) -> Result<(), Error> {
         if self.ty == MaintenanceType::Delete {
             bail!("datastore is being deleted");
+        } else if self.ty == MaintenanceType::Create {
+            bail!("datastore is being created");
         }
 
         let message = percent_encoding::percent_decode_str(self.message.as_deref().unwrap_or(""))
-- 
2.47.3