crimson/os/seastore: add retire alloc remarks for backref extents to skip replay invalid deltas

Fixes: https://tracker.ceph.com/issues/72580

Signed-off-by: Zhang Song <[email protected]>

Author: zhscn

src/crimson/os/seastore/cache.cc

@@ -1436,6 +1436,14 @@ record_t Cache::prepare_record(
 	  extent->get_length(),
 	  extent->get_type()));
     } else if (is_backref_node(extent->get_type())) {
+      // The retire alloc deltas are used to identify the invalid backref extent
+      // deltas during replay when using CircularBoundedJournal, see
+      // build_paddr_seq_map in CBJournal::replay().
+      rel_delta.alloc_blk_ranges.emplace_back(
+	alloc_blk_t::create_retire(
+	  extent->get_paddr(),
+	  extent->get_length(),
+	  extent->get_type()));
       remove_backref_extent(extent->get_paddr());
     } else {
       ERRORT("Got unexpected extent type: {}", t, *extent);

src/crimson/os/seastore/seastore_types.h

@@ -2107,6 +2107,7 @@ struct alloc_blk_t {
       extent_len_t len,
       extent_types_t type) {
     assert(is_backref_mapped_type(type) ||
+	   is_backref_node(type) ||
 	   is_retired_placeholder_type(type));
     return alloc_blk_t(paddr, L_ADDR_NULL, len, type);
   }