crimson/osd: optimize the fast path of get_recovery_read()

no need to enqueue if the lock can be acquired without waiting for it.

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/crimson/osd/object_context.h b/src/crimson/osd/object_context.h
index 6a2ba9f2c877cf2de722db75565f65afd20d4efd..40bda6592e84a9777bf27cd61aeff36274e8e7a1 100644 (file)
--- a/src/crimson/osd/object_context.h
+++ b/src/crimson/osd/object_context.h
@@ -204,8 +204,9 @@ public:
     return put_lock_type(RWState::RWREAD);
   }
   seastar::future<bool> get_recovery_read(bool can_wait = false) {
-    if (!can_wait) {
-      return seastar::make_ready_future<bool>(rwstate.get_recovery_read());
+    if (bool acquired = rwstate.get_recovery_read();
+        acquired || !can_wait) {
+      return seastar::make_ready_future<bool>(acquired);
     }
     return with_queue([this] {
       return rwstate.get_recovery_read();