fix quota manager not exiting properly on stop

Author: 0x7d8

src/main.cpp

@@ -171,15 +171,23 @@ int main(int argc, char *argv[]) {
         fuse_loop_cfg_set_max_threads(loop_config, fs.num_threads);
     fuse_loop_cfg_set_clone_fd(loop_config, fs.clone_fd);
 
+    debug_print("Filesystem mounted at {}", mountpoint);
+
     int ret =
         options.count("single") ? fuse_session_loop(se) : fuse_session_loop_mt(se, loop_config);
 
+    debug_print("Filesystem unmounting");
+
     fuse_session_unmount(se);
     fuse_remove_signal_handlers(se);
 
+    debug_print("Filesystem unmounted");
+
     fs.shutdown_complete.release();
 
     fuse_opt_free_args(&args);
 
+    debug_print("Filesystem exited with code {}", ret);
+
     return ret;
 }

src/quota.cpp

@@ -1,4 +1,6 @@
 #include "quota.hpp"
+#include <condition_variable>
+#include <mutex>
 #include <unordered_set>
 #include "inode.hpp"
 
@@ -48,8 +50,16 @@ void QuotaManager::calculate_usage() {
 }
 
 void QuotaManager::background_scanner(std::stop_token st) {
+    std::mutex mtx;
+    std::condition_variable_any cv;
+
     while (!st.stop_requested()) {
-        if (std::this_thread::sleep_for(rescan_interval); st.stop_requested()) {
+        std::unique_lock lock(mtx);
+
+        bool stop_now =
+            cv.wait_for(lock, st, rescan_interval, [&st] { return st.stop_requested(); });
+
+        if (stop_now) {
             break;
         }