rgw: switch back to boost::asio for spawn() and yield_context

a fork of boost::asio::spawn() was introduced in 2020 with spawn::spawn() from #31580. this fork enabled rgw to customize how the coroutine stacks are allocated in order to avoid stack overflows in frontend request coroutines. this customization was based on a StackAllocator concept from the boost::context library

in boost 1.80, that same StackAllocator overload was added to boost::asio::spawn(), along with other improvements like per-op cancellation. now that boost has everything we need, switch back and drop the spawn submodule

this required switching a lot of async functions from async_completion<> to async_initiate<>. similar changes were necessary to enable the c++20 coroutine token boost::asio::use_awaitable

Signed-off-by: Casey Bodley <cbodley@redhat.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/src/rgw/driver/rados/rgw_tools.cc b/src/rgw/driver/rados/rgw_tools.cc
index 41254f9519e..eec4a799115 100644
--- a/src/rgw/driver/rados/rgw_tools.cc
+++ b/src/rgw/driver/rados/rgw_tools.cc
@@ -203,11 +203,10 @@ int rgw_rados_operate(const DoutPrefixProvider *dpp, librados::IoCtx& ioctx, con
   // given a yield_context, call async_operate() to yield the coroutine instead
   // of blocking
   if (y) {
-    auto& context = y.get_io_context();
     auto& yield = y.get_yield_context();
     boost::system::error_code ec;
     auto bl = librados::async_operate(
-      context, ioctx, oid, op, flags, trace_info, yield[ec]);
+      yield, ioctx, oid, op, flags, trace_info, yield[ec]);
     if (pbl) {
       *pbl = std::move(bl);
     }
@@ -228,10 +227,9 @@ int rgw_rados_operate(const DoutPrefixProvider *dpp, librados::IoCtx& ioctx, con
 		      int flags, const jspan_context* trace_info)
 {
   if (y) {
-    auto& context = y.get_io_context();
     auto& yield = y.get_yield_context();
     boost::system::error_code ec;
-    librados::async_operate(context, ioctx, oid, op, flags, trace_info, yield[ec]);
+    librados::async_operate(yield, ioctx, oid, op, flags, trace_info, yield[ec]);
     return -ec.value();
   }
   if (is_asio_thread) {
@@ -248,10 +246,9 @@ int rgw_rados_notify(const DoutPrefixProvider *dpp, librados::IoCtx& ioctx, cons
                      optional_yield y)
 {
   if (y) {
-    auto& context = y.get_io_context();
     auto& yield = y.get_yield_context();
     boost::system::error_code ec;
-    auto reply = librados::async_notify(context, ioctx, oid,
+    auto reply = librados::async_notify(yield, ioctx, oid,
                                         bl, timeout_ms, yield[ec]);
     if (pbl) {
       *pbl = std::move(reply);