From 2d854c732774f8e4b9359675fa6996a08c59d532 Mon Sep 17 00:00:00 2001
From: Axel Burri <axel@tty0.ch>
Date: Sat, 24 Jul 2021 11:19:04 +0200
Subject: [PATCH] btrbk: add comment on clone source from different mount point

---
 btrbk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/btrbk b/btrbk
index 11e4139..957e5d8 100755
--- a/btrbk
+++ b/btrbk
@@ -3697,6 +3697,9 @@ sub get_best_parent($$$;@)
   # mountpoint as the source subvolume:
   #  - btrfs send -p: "ERROR: not on mount point: /path/to/mountpoint"
   #  - btrfs receive: "ERROR: parent subvol is not reachable from inside the root subvol"
+  #
+  # Note that specifying clones from outside the mount point would work for btrfs send,
+  # but btrfs receive fails with same error as above (tested with v5.13).
   my $source_fallback_all_mountpoints = ($source_incremental_resolve eq "_all_accessible");
   my $target_fallback_all_mountpoints = ($target_incremental_resolve eq "_all_accessible");