[pbs-devel] [PATCH proxmox-backup] pbs-api-types: new MaintenanceType::Unmount, implement and use set_maintenance_mode

[pbs-devel] [PATCH proxmox-backup] pbs-api-types: new MaintenanceType::Unmount, implement and use set_maintenance_mode

[Dietmar Maurer]

Signed-off-by: Dietmar Maurer <dietmar@proxmox.com>
---
 pbs-api-types/src/datastore.rs   | 49 ++++++++++++++++++++++++++++----
 pbs-api-types/src/maintenance.rs | 11 ++++---
 pbs-datastore/src/datastore.rs   |  8 ++++--
 src/api2/config/datastore.rs     | 13 +++++++--
 4 files changed, 66 insertions(+), 15 deletions(-)

diff --git a/pbs-api-types/src/datastore.rs b/pbs-api-types/src/datastore.rs
index 5e13c157..9fe45bc0 100644
--- a/pbs-api-types/src/datastore.rs
+++ b/pbs-api-types/src/datastore.rs
@@ -11,8 +11,8 @@ use proxmox_schema::{
 };
 
 use crate::{
-    Authid, CryptMode, Fingerprint, GroupFilter, MaintenanceMode, Userid, BACKUP_ID_RE,
-    BACKUP_NS_RE, BACKUP_TIME_RE, BACKUP_TYPE_RE, DATASTORE_NOTIFY_STRING_SCHEMA,
+    Authid, CryptMode, Fingerprint, GroupFilter, MaintenanceMode, MaintenanceType, Userid,
+    BACKUP_ID_RE, BACKUP_NS_RE, BACKUP_TIME_RE, BACKUP_TYPE_RE, DATASTORE_NOTIFY_STRING_SCHEMA,
     GC_SCHEDULE_SCHEMA, GROUP_OR_SNAPSHOT_PATH_REGEX_STR, PROXMOX_SAFE_ID_FORMAT,
     PROXMOX_SAFE_ID_REGEX_STR, PRUNE_SCHEDULE_SCHEMA, SHA256_HEX_REGEX, SINGLE_LINE_COMMENT_SCHEMA,
     SNAPSHOT_PATH_REGEX_STR, UPID,
@@ -336,10 +336,47 @@ impl DataStoreConfig {
     }
 
     pub fn get_maintenance_mode(&self) -> Option<MaintenanceMode> {
-        self.maintenance_mode
-            .as_ref()
-            .and_then(|str| MaintenanceMode::API_SCHEMA.parse_property_string(str).ok())
-            .and_then(|value| MaintenanceMode::deserialize(value).ok())
+        self.maintenance_mode.as_ref().and_then(|str| {
+            MaintenanceMode::deserialize(proxmox_schema::de::SchemaDeserializer::new(
+                str,
+                &MaintenanceMode::API_SCHEMA,
+            ))
+            .ok()
+        })
+    }
+
+    pub fn set_maintenance_mode(&mut self, new_mode: Option<MaintenanceMode>) -> Result<(), Error> {
+        let current_type = self.get_maintenance_mode().map(|mode| mode.ty);
+        let new_type = new_mode.as_ref().map(|mode| mode.ty);
+
+        match current_type {
+            Some(MaintenanceType::ReadOnly) => { /* always OK  */ }
+            Some(MaintenanceType::Offline) => { /* always OK  */ }
+            Some(MaintenanceType::Unmount) => {
+                bail!("datastore is being unmounted");
+            }
+            Some(MaintenanceType::Delete) => {
+                match new_type {
+                    Some(MaintenanceType::Delete) => { /* allow to delete a deleted storage */ }
+                    _ => {
+                        bail!("datastore is being deleted")
+                    }
+                }
+            }
+            None => { /* always OK  */ }
+        }
+
+        let new_mode = match new_mode {
+            Some(new_mode) => Some(
+                proxmox_schema::property_string::PropertyString::new(new_mode)
+                    .to_property_string()?,
+            ),
+            None => None,
+        };
+
+        self.maintenance_mode = new_mode;
+
+        Ok(())
     }
 }
 
diff --git a/pbs-api-types/src/maintenance.rs b/pbs-api-types/src/maintenance.rs
index a605cc17..fd4d3416 100644
--- a/pbs-api-types/src/maintenance.rs
+++ b/pbs-api-types/src/maintenance.rs
@@ -33,12 +33,11 @@ pub enum Operation {
 }
 
 #[api]
-#[derive(Deserialize, Serialize, PartialEq, Eq)]
+#[derive(Copy, Clone, Deserialize, Serialize, PartialEq, Eq)]
 #[serde(rename_all = "kebab-case")]
 /// Maintenance type.
 pub enum MaintenanceType {
     // TODO:
-    //  - Add "unmounting" once we got pluggable datastores
     //  - 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
@@ -48,6 +47,8 @@ pub enum MaintenanceType {
     Offline,
     /// The datastore is being deleted.
     Delete,
+    /// The (removable) datastore is being unmounted.
+    Unmount,
 }
 serde_plain::derive_display_from_serialize!(MaintenanceType);
 serde_plain::derive_fromstr_from_deserialize!(MaintenanceType);
@@ -69,11 +70,11 @@ serde_plain::derive_fromstr_from_deserialize!(MaintenanceType);
 pub struct MaintenanceMode {
     /// Type of maintenance ("read-only" or "offline").
     #[serde(rename = "type")]
-    ty: MaintenanceType,
+    pub ty: MaintenanceType,
 
     /// Reason for maintenance.
     #[serde(skip_serializing_if = "Option::is_none")]
-    message: Option<String>,
+    pub message: Option<String>,
 }
 
 impl MaintenanceMode {
@@ -94,6 +95,8 @@ impl MaintenanceMode {
 
         if let Some(Operation::Lookup) = operation {
             return Ok(());
+        } else if self.ty == MaintenanceType::Unmount {
+            bail!("datastore is being unmounted");
         } else if self.ty == MaintenanceType::Offline {
             bail!("offline maintenance mode: {}", message);
         } else if self.ty == MaintenanceType::ReadOnly {
diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index 0685cc84..f95da761 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -20,7 +20,7 @@ use proxmox_sys::{task_log, task_warn};
 
 use pbs_api_types::{
     Authid, BackupNamespace, BackupType, ChunkOrder, DataStoreConfig, DatastoreFSyncLevel,
-    DatastoreTuning, GarbageCollectionStatus, Operation, UPID,
+    DatastoreTuning, GarbageCollectionStatus, MaintenanceMode, MaintenanceType, Operation, UPID,
 };
 
 use crate::backup_info::{BackupDir, BackupGroup, BackupGroupDeleteStats};
@@ -1390,7 +1390,11 @@ impl DataStore {
         let (mut config, _digest) = pbs_config::datastore::config()?;
         let mut datastore_config: DataStoreConfig = config.lookup("datastore", name)?;
 
-        datastore_config.maintenance_mode = Some("type=delete".to_string());
+        datastore_config.set_maintenance_mode(Some(MaintenanceMode {
+            ty: MaintenanceType::Delete,
+            message: None,
+        }))?;
+
         config.set_data(name, "datastore", &datastore_config)?;
         pbs_config::datastore::save_config(&config)?;
         drop(config_lock);
diff --git a/src/api2/config/datastore.rs b/src/api2/config/datastore.rs
index 3081e1f4..87425ff5 100644
--- a/src/api2/config/datastore.rs
+++ b/src/api2/config/datastore.rs
@@ -13,7 +13,7 @@ use proxmox_uuid::Uuid;
 
 use pbs_api_types::{
     Authid, DataStoreConfig, DataStoreConfigUpdater, DatastoreNotify, DatastoreTuning, KeepOptions,
-    PruneJobConfig, PruneJobOptions, DATASTORE_SCHEMA, PRIV_DATASTORE_ALLOCATE,
+    MaintenanceMode, PruneJobConfig, PruneJobOptions, DATASTORE_SCHEMA, PRIV_DATASTORE_ALLOCATE,
     PRIV_DATASTORE_AUDIT, PRIV_DATASTORE_MODIFY, PROXMOX_CONFIG_DIGEST_SCHEMA, UPID_SCHEMA,
 };
 use pbs_config::BackupLockGuard;
@@ -319,7 +319,7 @@ pub fn update_datastore(
                     data.tuning = None;
                 }
                 DeletableProperty::MaintenanceMode => {
-                    data.maintenance_mode = None;
+                    data.set_maintenance_mode(None)?;
                 }
             }
         }
@@ -392,7 +392,14 @@ pub fn update_datastore(
     let mut maintenance_mode_changed = false;
     if update.maintenance_mode.is_some() {
         maintenance_mode_changed = data.maintenance_mode != update.maintenance_mode;
-        data.maintenance_mode = update.maintenance_mode;
+
+        let maintenance_mode = match update.maintenance_mode {
+            Some(mode_str) => Some(MaintenanceMode::deserialize(
+                proxmox_schema::de::SchemaDeserializer::new(mode_str, &MaintenanceMode::API_SCHEMA),
+            )?),
+            None => None,
+        };
+        data.set_maintenance_mode(maintenance_mode)?;
     }
 
     config.set_data(&name, "datastore", &data)?;
-- 
2.39.2


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