[pbs-devel] [PATCH v4 proxmox-backup 3/6] pbs-datastore: add active operations tracking
Hannes Laimer
h.laimer at proxmox.com
Fri Nov 12 13:30:16 CET 2021
Saves the currently active read/write operation counts in a file. The
file is updated whenever a reference returned by lookup_datastore is
dropped and whenever a reference is returned by lookup_datastore. The
files are locked before every access, there is one file per datastore.
---
v3->v4: implement Clone for the DataStore wrapper struct. So clones are
tracked correctly. On every update of the file, the lines of inactive
processes are removed. A line looks like this:
<pid> <read> <write>
So, PID has <read>/<write> active read/write operations. This is needed
because if we just had one number for read/write and some process would
die, we are not able to find out how many operations were ended with
it. Like this we only consider lines that have a PID that belongs to an
active process.
pbs-api-types/src/maintenance.rs | 1 +
pbs-datastore/Cargo.toml | 1 +
pbs-datastore/src/datastore.rs | 166 +++++++++++++++++++++++++------
pbs-datastore/src/lib.rs | 3 +
src/bin/proxmox-backup-api.rs | 1 +
src/server/mod.rs | 16 ++-
6 files changed, 158 insertions(+), 30 deletions(-)
diff --git a/pbs-api-types/src/maintenance.rs b/pbs-api-types/src/maintenance.rs
index f816b279..98e3ec62 100644
--- a/pbs-api-types/src/maintenance.rs
+++ b/pbs-api-types/src/maintenance.rs
@@ -25,6 +25,7 @@ pub enum MaintenanceType {
Offline(String),
}
+#[derive(Copy ,Clone)]
/// Operation requirments, used when checking for maintenance mode.
pub enum Operation {
Read,
diff --git a/pbs-datastore/Cargo.toml b/pbs-datastore/Cargo.toml
index 01c5ee00..2063c1bb 100644
--- a/pbs-datastore/Cargo.toml
+++ b/pbs-datastore/Cargo.toml
@@ -34,5 +34,6 @@ proxmox-time = "1"
proxmox-uuid = "1"
pbs-api-types = { path = "../pbs-api-types" }
+pbs-buildcfg = { path = "../pbs-buildcfg" }
pbs-tools = { path = "../pbs-tools" }
pbs-config = { path = "../pbs-config" }
diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index 064fd273..d8c2f3f5 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -9,6 +9,7 @@ use std::time::Duration;
use anyhow::{bail, format_err, Error};
use lazy_static::lazy_static;
+use proxmox::sys::linux::procfs;
use proxmox::tools::fs::{replace_file, file_read_optional_string, CreateOptions};
use pbs_api_types::{UPID, DataStoreConfig, Authid, GarbageCollectionStatus, MaintenanceType, Operation};
@@ -31,7 +32,7 @@ use crate::manifest::{
};
lazy_static! {
- static ref DATASTORE_MAP: Mutex<HashMap<String, Arc<DataStore>>> = Mutex::new(HashMap::new());
+ static ref DATASTORE_MAP: Mutex<HashMap<String, Arc<DataStoreImpl>>> = Mutex::new(HashMap::new());
}
/// checks if auth_id is owner, or, if owner is a token, if
@@ -52,13 +53,113 @@ pub fn check_backup_owner(
///
/// A Datastore can store severals backups, and provides the
/// management interface for backup.
-pub struct DataStore {
+pub struct DataStoreImpl {
chunk_store: Arc<ChunkStore>,
gc_mutex: Mutex<()>,
last_gc_status: Mutex<GarbageCollectionStatus>,
verify_new: bool,
}
+pub struct DataStore {
+ inner: Arc<DataStoreImpl>,
+ operation: Option<Operation>,
+}
+
+impl Clone for DataStore {
+ fn clone(&self) -> Self {
+ if let Some(operation) = self.operation.clone() {
+ if let Err(e) = update_active_operations(self.name(), operation, -1) {
+ eprintln!("could not update active operations - {}", e);
+ }
+ }
+ DataStore {
+ inner: self.inner.clone(),
+ operation: self.operation.clone(),
+ }
+ }
+}
+
+fn update_active_operations(name: &str, operation: Operation, count: i64) -> Result<(), Error> {
+ let mut path = PathBuf::from(crate::ACTIVE_OPERATIONS_DIR);
+ let mut lock_path = PathBuf::from(crate::ACTIVE_OPERATIONS_DIR);
+ path.push(name);
+ lock_path.push(format!(".{}.lock", name));
+
+ let user = pbs_config::backup_user()?;
+ let options = proxmox::tools::fs::CreateOptions::new()
+ .group(user.gid)
+ .owner(user.uid)
+ .perm(nix::sys::stat::Mode::from_bits_truncate(0o660));
+
+ let timeout = std::time::Duration::new(10, 0);
+ proxmox::tools::fs::open_file_locked(&lock_path, timeout, true, options.clone())?;
+
+ let pid = std::process::id() as i64;
+ proxmox::tools::fs::replace_file(
+ &path,
+ match proxmox::tools::fs::file_get_optional_contents(&path) {
+ Ok(Some(data)) => {
+ let mut updated = false;
+ let new_data = String::from_utf8(data)
+ .unwrap_or(String::new())
+ .lines()
+ .into_iter()
+ .fold(String::new(), |xs, line| {
+ let split = line.split(" ").collect::<Vec<&str>>();
+ match split[0].parse::<i32>() {
+ Ok(line_pid) if line_pid as i64 == pid && split.len() == 3 => {
+ let stat = (
+ split[1].parse::<i64>().unwrap_or(0),
+ split[2].parse::<i64>().unwrap_or(0),
+ );
+ updated = true;
+ match (operation, stat) {
+ (Operation::Write, (r, w)) => {
+ format!("{}\n{} {} {}", xs, pid, r, w + count)
+ }
+ (Operation::Read, (r, w)) => {
+ format!("{}\n{} {} {}", xs, pid, r + count, w)
+ }
+ }
+ }
+ Ok(line_pid)
+ if procfs::check_process_running(line_pid).is_some()
+ && split.len() == 3 =>
+ {
+ format!("{}\n{}", xs, line)
+ }
+ _ => xs,
+ }
+ });
+ match operation {
+ Operation::Read if !updated => format!("{}\n{} {} {}", new_data, pid, 1, 0),
+ Operation::Write if !updated => format!("{}\n{} {} {}", new_data, pid, 0, 1),
+ _ => new_data,
+ }
+ }
+ _ => match operation {
+ Operation::Read => format!("{} {} {}", pid, 1, 0),
+ Operation::Write => format!("{} {} {}", pid, 0, 1),
+ },
+ }
+ .as_bytes(),
+ options,
+ false,
+ )?;
+
+ Ok(())
+}
+
+impl Drop for DataStore {
+ fn drop(&mut self) {
+ if let Some(operation) = self.operation.clone() {
+ if let Err(e) = update_active_operations(self.name(), operation, -1) {
+ eprintln!("could not update active operations - {}", e);
+ }
+ }
+ }
+}
+
impl DataStore {
pub fn lookup_datastore(
name: &str,
@@ -73,6 +174,7 @@ impl DataStore {
| (Some(MaintenanceType::Offline(message)), Some(_)) => {
bail!("Datastore '{}' is in maintenance mode: {}", name, message);
},
+ (_, Some(operation)) => update_active_operations(name, operation, 1)?,
_ => {}
}
@@ -83,7 +185,10 @@ impl DataStore {
if datastore.chunk_store.base() == path &&
datastore.verify_new == config.verify_new.unwrap_or(false)
{
- return Ok(datastore.clone());
+ return Ok(Arc::new(Self {
+ inner: datastore.clone(),
+ operation,
+ }))
}
}
@@ -92,7 +197,10 @@ impl DataStore {
let datastore = Arc::new(datastore);
map.insert(name.to_string(), datastore.clone());
- Ok(datastore)
+ Ok(Arc::new(Self {
+ inner: datastore,
+ operation,
+ }))
}
/// removes all datastores that are not configured anymore
@@ -107,7 +215,7 @@ impl DataStore {
Ok(())
}
- fn open_with_path(store_name: &str, path: &Path, config: DataStoreConfig) -> Result<Self, Error> {
+ fn open_with_path(store_name: &str, path: &Path, config: DataStoreConfig) -> Result<DataStoreImpl, Error> {
let chunk_store = ChunkStore::open(store_name, path)?;
let mut gc_status_path = chunk_store.base_path();
@@ -125,7 +233,7 @@ impl DataStore {
GarbageCollectionStatus::default()
};
- Ok(Self {
+ Ok(DataStoreImpl {
chunk_store: Arc::new(chunk_store),
gc_mutex: Mutex::new(()),
last_gc_status: Mutex::new(gc_status),
@@ -139,19 +247,19 @@ impl DataStore {
impl Iterator<Item = (Result<pbs_tools::fs::ReadDirEntry, Error>, usize, bool)>,
Error
> {
- self.chunk_store.get_chunk_iterator()
+ self.inner.chunk_store.get_chunk_iterator()
}
pub fn create_fixed_writer<P: AsRef<Path>>(&self, filename: P, size: usize, chunk_size: usize) -> Result<FixedIndexWriter, Error> {
- let index = FixedIndexWriter::create(self.chunk_store.clone(), filename.as_ref(), size, chunk_size)?;
+ let index = FixedIndexWriter::create(self.inner.chunk_store.clone(), filename.as_ref(), size, chunk_size)?;
Ok(index)
}
pub fn open_fixed_reader<P: AsRef<Path>>(&self, filename: P) -> Result<FixedIndexReader, Error> {
- let full_path = self.chunk_store.relative_path(filename.as_ref());
+ let full_path = self.inner.chunk_store.relative_path(filename.as_ref());
let index = FixedIndexReader::open(&full_path)?;
@@ -163,14 +271,14 @@ impl DataStore {
) -> Result<DynamicIndexWriter, Error> {
let index = DynamicIndexWriter::create(
- self.chunk_store.clone(), filename.as_ref())?;
+ self.inner.chunk_store.clone(), filename.as_ref())?;
Ok(index)
}
pub fn open_dynamic_reader<P: AsRef<Path>>(&self, filename: P) -> Result<DynamicIndexReader, Error> {
- let full_path = self.chunk_store.relative_path(filename.as_ref());
+ let full_path = self.inner.chunk_store.relative_path(filename.as_ref());
let index = DynamicIndexReader::open(&full_path)?;
@@ -220,11 +328,11 @@ impl DataStore {
}
pub fn name(&self) -> &str {
- self.chunk_store.name()
+ self.inner.chunk_store.name()
}
pub fn base_path(&self) -> PathBuf {
- self.chunk_store.base_path()
+ self.inner.chunk_store.base_path()
}
/// Cleanup a backup directory
@@ -530,7 +638,7 @@ impl DataStore {
worker.check_abort()?;
worker.fail_on_shutdown()?;
let digest = index.index_digest(pos).unwrap();
- if !self.chunk_store.cond_touch_chunk(digest, false)? {
+ if !self.inner.chunk_store.cond_touch_chunk(digest, false)? {
task_warn!(
worker,
"warning: unable to access non-existent chunk {}, required by {:?}",
@@ -546,7 +654,7 @@ impl DataStore {
let mut bad_path = PathBuf::new();
bad_path.push(self.chunk_path(digest).0);
bad_path.set_extension(bad_ext);
- self.chunk_store.cond_touch_path(&bad_path, false)?;
+ self.inner.chunk_store.cond_touch_path(&bad_path, false)?;
}
}
}
@@ -626,24 +734,24 @@ impl DataStore {
}
pub fn last_gc_status(&self) -> GarbageCollectionStatus {
- self.last_gc_status.lock().unwrap().clone()
+ self.inner.last_gc_status.lock().unwrap().clone()
}
pub fn garbage_collection_running(&self) -> bool {
- !matches!(self.gc_mutex.try_lock(), Ok(_))
+ !matches!(self.inner.gc_mutex.try_lock(), Ok(_))
}
pub fn garbage_collection(&self, worker: &dyn WorkerTaskContext, upid: &UPID) -> Result<(), Error> {
- if let Ok(ref mut _mutex) = self.gc_mutex.try_lock() {
+ if let Ok(ref mut _mutex) = self.inner.gc_mutex.try_lock() {
// avoids that we run GC if an old daemon process has still a
// running backup writer, which is not save as we have no "oldest
// writer" information and thus no safe atime cutoff
- let _exclusive_lock = self.chunk_store.try_exclusive_lock()?;
+ let _exclusive_lock = self.inner.chunk_store.try_exclusive_lock()?;
let phase1_start_time = proxmox_time::epoch_i64();
- let oldest_writer = self.chunk_store.oldest_writer().unwrap_or(phase1_start_time);
+ let oldest_writer = self.inner.chunk_store.oldest_writer().unwrap_or(phase1_start_time);
let mut gc_status = GarbageCollectionStatus::default();
gc_status.upid = Some(upid.to_string());
@@ -653,7 +761,7 @@ impl DataStore {
self.mark_used_chunks(&mut gc_status, worker)?;
task_log!(worker, "Start GC phase2 (sweep unused chunks)");
- self.chunk_store.sweep_unused_chunks(
+ self.inner.chunk_store.sweep_unused_chunks(
oldest_writer,
phase1_start_time,
&mut gc_status,
@@ -730,7 +838,7 @@ impl DataStore {
let _ = replace_file(path, serialized.as_bytes(), options, false);
}
- *self.last_gc_status.lock().unwrap() = gc_status;
+ *self.inner.last_gc_status.lock().unwrap() = gc_status;
} else {
bail!("Start GC failed - (already running/locked)");
@@ -740,15 +848,15 @@ impl DataStore {
}
pub fn try_shared_chunk_store_lock(&self) -> Result<ProcessLockSharedGuard, Error> {
- self.chunk_store.try_shared_lock()
+ self.inner.chunk_store.try_shared_lock()
}
pub fn chunk_path(&self, digest:&[u8; 32]) -> (PathBuf, String) {
- self.chunk_store.chunk_path(digest)
+ self.inner.chunk_store.chunk_path(digest)
}
pub fn cond_touch_chunk(&self, digest: &[u8; 32], fail_if_not_exist: bool) -> Result<bool, Error> {
- self.chunk_store.cond_touch_chunk(digest, fail_if_not_exist)
+ self.inner.chunk_store.cond_touch_chunk(digest, fail_if_not_exist)
}
pub fn insert_chunk(
@@ -756,7 +864,7 @@ impl DataStore {
chunk: &DataBlob,
digest: &[u8; 32],
) -> Result<(bool, u64), Error> {
- self.chunk_store.insert_chunk(chunk, digest)
+ self.inner.chunk_store.insert_chunk(chunk, digest)
}
pub fn load_blob(&self, backup_dir: &BackupDir, filename: &str) -> Result<DataBlob, Error> {
@@ -772,13 +880,13 @@ impl DataStore {
pub fn stat_chunk(&self, digest: &[u8; 32]) -> Result<std::fs::Metadata, Error> {
- let (chunk_path, _digest_str) = self.chunk_store.chunk_path(digest);
+ let (chunk_path, _digest_str) = self.inner.chunk_store.chunk_path(digest);
std::fs::metadata(chunk_path).map_err(Error::from)
}
pub fn load_chunk(&self, digest: &[u8; 32]) -> Result<DataBlob, Error> {
- let (chunk_path, digest_str) = self.chunk_store.chunk_path(digest);
+ let (chunk_path, digest_str) = self.inner.chunk_store.chunk_path(digest);
proxmox_lang::try_block!({
let mut file = std::fs::File::open(&chunk_path)?;
@@ -892,7 +1000,7 @@ impl DataStore {
}
pub fn verify_new(&self) -> bool {
- self.verify_new
+ self.inner.verify_new
}
/// returns a list of chunks sorted by their inode number on disk
diff --git a/pbs-datastore/src/lib.rs b/pbs-datastore/src/lib.rs
index d50a64a5..159642fd 100644
--- a/pbs-datastore/src/lib.rs
+++ b/pbs-datastore/src/lib.rs
@@ -145,6 +145,9 @@
// Note: .pcat1 => Proxmox Catalog Format version 1
pub const CATALOG_NAME: &str = "catalog.pcat1.didx";
+/// Directory path where active operations counters are saved.
+pub const ACTIVE_OPERATIONS_DIR: &str = concat!(pbs_buildcfg::PROXMOX_BACKUP_RUN_DIR_M!(), "/active-operations");
+
#[macro_export]
macro_rules! PROXMOX_BACKUP_PROTOCOL_ID_V1 {
() => {
diff --git a/src/bin/proxmox-backup-api.rs b/src/bin/proxmox-backup-api.rs
index 9eb20269..aa60d316 100644
--- a/src/bin/proxmox-backup-api.rs
+++ b/src/bin/proxmox-backup-api.rs
@@ -73,6 +73,7 @@ async fn run() -> Result<(), Error> {
proxmox_backup::server::create_run_dir()?;
proxmox_backup::server::create_state_dir()?;
+ proxmox_backup::server::create_active_operations_dir()?;
proxmox_backup::server::jobstate::create_jobstate_dir()?;
proxmox_backup::tape::create_tape_status_dir()?;
proxmox_backup::tape::create_drive_state_dir()?;
diff --git a/src/server/mod.rs b/src/server/mod.rs
index deeb3398..ffb26f0e 100644
--- a/src/server/mod.rs
+++ b/src/server/mod.rs
@@ -4,7 +4,7 @@
//! services. We want async IO, so this is built on top of
//! tokio/hyper.
-use anyhow::Error;
+use anyhow::{format_err, Error};
use serde_json::Value;
use proxmox::tools::fs::{create_path, CreateOptions};
@@ -71,3 +71,17 @@ pub fn create_state_dir() -> Result<(), Error> {
create_path(pbs_buildcfg::PROXMOX_BACKUP_STATE_DIR_M!(), None, Some(opts))?;
Ok(())
}
+
+/// Create active operations dir with correct permission.
+pub fn create_active_operations_dir() -> Result<(), Error> {
+ let backup_user = pbs_config::backup_user()?;
+ let mode = nix::sys::stat::Mode::from_bits_truncate(0o0750);
+ let options = CreateOptions::new()
+ .perm(mode)
+ .owner(backup_user.uid)
+ .group(backup_user.gid);
+
+ create_path(pbs_datastore::ACTIVE_OPERATIONS_DIR, None, Some(options))
+ .map_err(|err: Error| format_err!("unable to create active operations dir - {}", err))?;
+ Ok(())
+}
--
2.30.2
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