[pbs-devel] [PATCH proxmox-backup v4 05/22] add helper for checking if a removable datastore is available
Christian Ebner
c.ebner at proxmox.com
Wed Apr 17 09:56:35 CEST 2024
two comments inline
On 4/16/24 17:23, Hannes Laimer wrote:
> Signed-off-by: Hannes Laimer <h.laimer at proxmox.com>
> ---
> pbs-datastore/src/datastore.rs | 49 ++++++++++++++++++++++++++++++++++
> pbs-datastore/src/lib.rs | 2 +-
> 2 files changed, 50 insertions(+), 1 deletion(-)
>
> diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
> index a7fe3b8c..ff2ca95f 100644
> --- a/pbs-datastore/src/datastore.rs
> +++ b/pbs-datastore/src/datastore.rs
> @@ -14,6 +14,7 @@ use proxmox_schema::ApiType;
> use proxmox_sys::error::SysError;
> use proxmox_sys::fs::{file_read_optional_string, replace_file, CreateOptions};
> use proxmox_sys::fs::{lock_dir_noblock, DirLockGuard};
> +use proxmox_sys::linux::procfs::MountInfo;
> use proxmox_sys::process_locker::ProcessLockSharedGuard;
> use proxmox_sys::WorkerTaskContext;
> use proxmox_sys::{task_log, task_warn};
> @@ -49,6 +50,35 @@ pub fn check_backup_owner(owner: &Authid, auth_id: &Authid) -> Result<(), Error>
> Ok(())
> }
>
> +pub fn is_datastore_available(config: &DataStoreConfig) -> bool {
> + config.backing_device.as_ref().map_or(true, |uuid| {
> + if let Ok(store_dev_path) = std::fs::read_link(Path::new("/dev/disk/by-uuid").join(uuid))
> + .map(|p| p.to_string_lossy().into_owned())
> + .map(|p| p.replace("../..", "/dev"))
> + .map(PathBuf::from)
> + {
> + let store_mount_point = PathBuf::from(&config.path);
> +
> + MountInfo::read().map_or(false, |mount_info| {
> + mount_info
> + .iter()
> + .filter_map(|(_, entry)| {
> + entry
> + .mount_source
> + .as_ref()
> + .map(|source| (&entry.mount_point, source))
> + })
> + .any(|(mount_point, mount_source)| {
> + PathBuf::from(&mount_point) == store_mount_point
> + && PathBuf::from(&mount_source) == store_dev_path
> + })
> + })
> + } else {
> + false
> + }
> + })
> +}
> +
Nice work on this one! Way better to look up the device name and getting
the mountpoint by that via procfs.
> /// Datastore Management
> ///
> /// A Datastore can store severals backups, and provides the
> @@ -149,6 +179,21 @@ impl DataStore {
> }
> }
>
> + if config.backing_device.is_some() {
> + let is_mounted = is_datastore_available(&config);
> + let mut datastore_cache = DATASTORE_MAP.lock().unwrap();
> + if let Some((_, true)) = datastore_cache.get(&config.name) {
> + if !is_mounted {
> + datastore_cache.remove(&config.name);
> + }
> + bail!("Removable Datastore in progress to being removed.");
Should maybe be rephrased to `Removable Datastore in progress of being
removed.` or `Pending removal of datastore.`
> + }
> + if !is_mounted {
> + datastore_cache.remove(&config.name);
> + bail!("Removable Datastore is not mounted");
> + }
> + }
> +
> if let Some(operation) = operation {
> update_active_operations(name, operation, 1)?;
> }
> @@ -253,6 +298,10 @@ impl DataStore {
> ) -> Result<Arc<Self>, Error> {
> let name = config.name.clone();
>
> + if !is_datastore_available(&config) {
> + bail!("Datastore is not available")
> + }
> +
> let tuning: DatastoreTuning = serde_json::from_value(
> DatastoreTuning::API_SCHEMA
> .parse_property_string(config.tuning.as_deref().unwrap_or(""))?,
> diff --git a/pbs-datastore/src/lib.rs b/pbs-datastore/src/lib.rs
> index 43050162..458f93d9 100644
> --- a/pbs-datastore/src/lib.rs
> +++ b/pbs-datastore/src/lib.rs
> @@ -206,7 +206,7 @@ pub use manifest::BackupManifest;
> pub use store_progress::StoreProgress;
>
> mod datastore;
> -pub use datastore::{check_backup_owner, DataStore};
> +pub use datastore::{check_backup_owner, is_datastore_available, DataStore};
>
> mod hierarchy;
> pub use hierarchy::{
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