From: Yingxin Cheng <yingxin.cheng@intel.com>
Date: Thu, 7 Mar 2024 08:41:25 +0000 (+0800)
Subject: crimson/os/seastore/../fixed_kv_node: add comment to copy-from-source
X-Git-Tag: testing/wip-batrick-testing-20240411.154038~247^2~2
X-Git-Url: http://git.apps.os.sepia.ceph.com/?a=commitdiff_plain;h=3df6477809f8aabacbf9850a09527c2887263949;p=ceph-ci.git

crimson/os/seastore/../fixed_kv_node: add comment to copy-from-source

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>
---

diff --git a/src/crimson/os/seastore/btree/fixed_kv_node.h b/src/crimson/os/seastore/btree/fixed_kv_node.h
index 6ad55e3b9b3..544727f30aa 100644
--- a/src/crimson/os/seastore/btree/fixed_kv_node.h
+++ b/src/crimson/os/seastore/btree/fixed_kv_node.h
@@ -430,6 +430,8 @@ struct FixedKVNode : ChildableCachedExtent {
 	// the foreign key is preserved
 	if (!child) {
 	  child = source.children[foreign_it.get_offset()];
+	  // child can be either valid if present, nullptr if absent,
+	  // or RESERVATION_PTR.
 	}
 	foreign_it++;
 	local_it++;