From a6c4be95307186f381f01adde26210f80f1f33d3 Mon Sep 17 00:00:00 2001
From: Petru Paler <petru@paler.net>
Date: Tue, 4 Nov 2025 17:51:34 +0000
Subject: [PATCH] Use clone source for btrfs send.

---
 common/nfs-services-server.nix | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/common/nfs-services-server.nix b/common/nfs-services-server.nix
index 842ffd4..c9d933b 100644
--- a/common/nfs-services-server.nix
+++ b/common/nfs-services-server.nix
@@ -139,8 +139,9 @@ in
                 echo "Incremental send completed successfully"
                 REPLICATION_SUCCESS=1
               else
-                echo "Incremental send failed (likely missing parent on receiver), falling back to full send"
-                btrfs send "$SNAPSHOT_PATH" | \
+                echo "Incremental send failed (likely missing parent on receiver), falling back to full send with clone source"
+                # Use -c to specify clone source, maintaining parent relationship even in full send
+                btrfs send -c "$PREV_LOCAL" "$SNAPSHOT_PATH" | \
                   ssh -i "$SSH_KEY" -o StrictHostKeyChecking=accept-new root@${standby} \
                   "btrfs receive /persist/services-standby"
                 REPLICATION_SUCCESS=1