[pbs-devel] [PATCH proxmox-backup v13 12/26] datastore: handle deletion of removable datastore properly

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

Data deletion is only possible if the datastore is mounted, won't attempt
mounting it for the purpose of deleting data is made.

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 pbs-datastore/src/datastore.rs |  4 +++-
 src/api2/config/datastore.rs   | 37 +++++++++++++++++++++++++++++++++-
 2 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index cadf9245..83e4dcb0 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -1525,7 +1525,9 @@ impl DataStore {
                         // weird, but ok
                     }
                     Err(err) if err.is_errno(nix::errno::Errno::EBUSY) => {
-                        warn!("Cannot delete datastore directory (is it a mount point?).")
+                        if datastore_config.backing_device.is_none() {
+                            warn!("Cannot delete datastore directory (is it a mount point?).")
+                        }
                     }
                     Err(err) if err.is_errno(nix::errno::Errno::ENOTEMPTY) => {
                         warn!("Datastore directory not empty, not deleting.")
diff --git a/src/api2/config/datastore.rs b/src/api2/config/datastore.rs
index 9140a7a4..60bff9e2 100644
--- a/src/api2/config/datastore.rs
+++ b/src/api2/config/datastore.rs
@@ -1,4 +1,4 @@
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
 use ::serde::{Deserialize, Serialize};
 use anyhow::{bail, Error};
@@ -29,6 +29,7 @@ use crate::api2::config::tape_backup_job::{delete_tape_backup_job, list_tape_bac
 use crate::api2::config::verify::delete_verification_job;
 use pbs_config::CachedUserInfo;
 
+use pbs_datastore::is_datastore_mounted_at;
 use proxmox_rest_server::WorkerTask;
 
 use crate::server::jobstate;
@@ -557,6 +558,21 @@ pub async fn delete_datastore(
         http_bail!(NOT_FOUND, "datastore '{}' does not exist.", name);
     }
 
+    let store_config: DataStoreConfig = config.lookup("datastore", &name)?;
+    let mount_status = store_config
+        .get_mount_point()
+        .zip(store_config.backing_device.as_ref())
+        .map(|(mount_point, device_uuid)| {
+            is_datastore_mounted_at(mount_point, device_uuid.to_string())
+        });
+
+    if destroy_data && mount_status == Some(false) {
+        http_bail!(
+            BAD_REQUEST,
+            "cannot destroy data on '{name}' unless the datastore is mounted"
+        );
+    }
+
     if !keep_job_configs {
         for job in list_verification_jobs(Some(name.clone()), Value::Null, rpcenv)? {
             delete_verification_job(job.config.id, None, rpcenv)?
@@ -583,6 +599,19 @@ pub async fn delete_datastore(
 
     let auth_id: Authid = rpcenv.get_auth_id().unwrap().parse()?;
     let to_stdout = rpcenv.env_type() == RpcEnvironmentType::CLI;
+    let name_copy = name.clone();
+    if let Ok(proxy_pid) = proxmox_rest_server::read_pid(pbs_buildcfg::PROXMOX_BACKUP_PROXY_PID_FN)
+    {
+        let sock = proxmox_daemon::command_socket::path_from_pid(proxy_pid);
+        let _ = proxmox_daemon::command_socket::send_raw(
+            sock,
+            &format!(
+                "{{\"command\":\"update-datastore-cache\",\"args\":\"{}\"}}\n",
+                name_copy
+            ),
+        )
+        .await;
+    };
 
     let upid = WorkerTask::new_thread(
         "delete-datastore",
@@ -595,6 +624,12 @@ pub async fn delete_datastore(
             // ignore errors
             let _ = jobstate::remove_state_file("prune", &name);
             let _ = jobstate::remove_state_file("garbage_collection", &name);
+            if destroy_data {
+                if let Some(mount_point) = store_config.get_mount_point() {
+                    let _ = unmount_by_mountpoint(Path::new(&mount_point));
+                    let _ = std::fs::remove_dir(&mount_point);
+                }
+            }
 
             if let Err(err) =
                 proxmox_async::runtime::block_on(crate::server::notify_datastore_removed())
-- 
2.39.5



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