[pbs-devel] [PATCH v3 proxmox-backup 4/5] api2: make maintenance_type updatable

[Hannes Laimer <h.laimer@proxmox.com>]

And check if conflicting operations are currently active on the
datastore.
---
 src/api2/config/datastore.rs | 42 +++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/src/api2/config/datastore.rs b/src/api2/config/datastore.rs
index b9367469..cf16ce02 100644
--- a/src/api2/config/datastore.rs
+++ b/src/api2/config/datastore.rs
@@ -1,3 +1,5 @@
+use std::fs::File;
+use std::io::Read;
 use std::path::PathBuf;
 
 use anyhow::{bail, Error};
@@ -11,7 +13,7 @@ use proxmox_section_config::SectionConfigData;
 use pbs_datastore::chunk_store::ChunkStore;
 use pbs_config::BackupLockGuard;
 use pbs_api_types::{
-    Authid, DatastoreNotify,
+    Authid, MaintenanceType, DatastoreNotify,
     DATASTORE_SCHEMA, PROXMOX_CONFIG_DIGEST_SCHEMA,
     PRIV_DATASTORE_ALLOCATE, PRIV_DATASTORE_AUDIT, PRIV_DATASTORE_MODIFY,
     DataStoreConfig, DataStoreConfigUpdater,
@@ -183,6 +185,8 @@ pub enum DeletableProperty {
     notify_user,
     /// Delete the notify property
     notify,
+    /// Delete the maintenance-type property
+    maintenance_type,
 }
 
 #[api(
@@ -249,6 +253,7 @@ pub fn update_datastore(
                 DeletableProperty::verify_new => { data.verify_new = None; },
                 DeletableProperty::notify => { data.notify = None; },
                 DeletableProperty::notify_user => { data.notify_user = None; },
+                DeletableProperty::maintenance_type => { data.maintenance_type = None; },
             }
         }
     }
@@ -294,6 +299,41 @@ pub fn update_datastore(
 
     if update.notify_user.is_some() { data.notify_user = update.notify_user; }
 
+    if let Some(maintenance_type) = update.maintenance_type {
+        let (reading, writing) = {
+            let mut path = PathBuf::from(pbs_datastore::ACTIVE_OPERATIONS_DIR);
+            path.push(&name);
+            if let Ok(mut file) = File::open(path) {
+                let timeout = std::time::Duration::new(10, 0);
+                proxmox::tools::fs::lock_file(&mut file, false, Some(timeout))?;
+
+                let mut data = String::new();
+                file.read_to_string(&mut data)?;
+                if data.is_empty() {
+                    (0, 0)
+                } else {
+                    let tmp = data.split(" ").collect::<Vec<&str>>();
+                    (
+                        tmp[0].parse::<i64>().unwrap_or(0),
+                        tmp[1].parse::<i64>().unwrap_or(0),
+                    )
+                }
+            } else {
+                (0, 0)
+            }
+        };
+
+        match maintenance_type {
+            MaintenanceType::ReadOnly(_) if writing > 0 => {
+                bail!("Can't enable maintenance mode because {} conflicting operations are still active.", writing);
+            }
+            MaintenanceType::Offline(_) if writing + reading > 0 => {
+                bail!("Can't enable maintenance mode because {} conflicting operations are still active.", (writing+reading));
+            }
+            _ => data.maintenance_type = Some(maintenance_type),
+        }
+    }
+
     config.set_data(&name, "datastore", &data)?;
 
     pbs_config::datastore::save_config(&config)?;
-- 
2.30.2