From: Zhang Song <zhangsong02@qianxin.com>
Date: Mon, 18 Aug 2025 11:16:32 +0000 (+0800)
Subject: crimson/os/seastore: don't apply backref extents' alloc deltas to cache
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=56023c346cbe6e212885b855e92ca5b5ae319916;p=ceph.git

crimson/os/seastore: don't apply backref extents' alloc deltas to cache

Signed-off-by: Zhang Song <zhangsong02@qianxin.com>
---

diff --git a/src/crimson/os/seastore/cache.cc b/src/crimson/os/seastore/cache.cc
index 255dd9406be..522a59b62e7 100644
--- a/src/crimson/os/seastore/cache.cc
+++ b/src/crimson/os/seastore/cache.cc
@@ -2050,6 +2050,14 @@ Cache::replay_delta(
     decode(alloc_delta, delta.bl);
     backref_entry_refs_t backref_entries;
     for (auto &alloc_blk : alloc_delta.alloc_blk_ranges) {
+      if (is_backref_node(alloc_blk.type)) {
+	// On startup, BackrefManager::scan_mapped_space() will scan all
+	// mappings and internal entries to rebuild the space management.
+	// It's unnecessary to apply the alloc deltas of backref extents
+	// to the cached backref entries and these deltas are only used
+	// to skip invalid deltas for RBM backends.
+	continue;
+      }
       if (alloc_blk.paddr.is_record_relative()) {
 	alloc_blk.paddr = record_base.add_relative(alloc_blk.paddr);
       } else {