crimson/os/seastore/cache: add newly read extent prior to read

We already block access to it, but it needs to be in the cache
for a concurrent transaction to see it and block appropriately.

Signed-off-by: Samuel Just <sjust@redhat.com>

diff --git a/src/crimson/os/seastore/cache.h b/src/crimson/os/seastore/cache.h
index 6242721628453c8ddf001bf0854f40423a9dda04..28d5f43aaf18d3fce6cb199432f2a09bb2202827 100644 (file)
--- a/src/crimson/os/seastore/cache.h
+++ b/src/crimson/os/seastore/cache.h
@@ -156,6 +156,7 @@ public:
       ref->set_io_wait();
       ref->set_paddr(offset);
       ref->state = CachedExtent::extent_state_t::CLEAN;
+      add_extent(ref);
 
       return segment_manager.read(
        offset,
@@ -167,7 +168,6 @@ public:
 
            ref->on_clean_read();
            ref->complete_io();
-           add_extent(ref);
            return get_extent_ertr::make_ready_future<TCachedExtentRef<T>>(
              std::move(ref));
          },