From 3fe746ed64c383c6ceb403c48b2a3fdeb3af200c Mon Sep 17 00:00:00 2001
From: teesid <teesid@instasim.com>
Date: Fri, 29 Jun 2018 09:36:10 +0700
Subject: [PATCH] btrbk: it is now possible to back up a subvolume that is
 already mounted at /.

It works with the configuration snippet below:

```
volume /
  subvolume  .
    snapshot_create  ondemand
    snapshot_name    root
    target send-receive      /mnt/ext-backup/snapshots
```
---
 btrbk | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/btrbk b/btrbk
index f4a76c1..e35b9fb 100755
--- a/btrbk
+++ b/btrbk
@@ -5303,7 +5303,10 @@ MAIN:
         WARN "Skipping subvolume \"$svol->{PRINT}\": $abrt";
         next;
       }
-      if($svol->{node}{uuid} && _is_child_of($sroot->{node}, $svol->{node}{uuid})) {
+      if($svol->{node}{uuid} &&
+          (_is_child_of($sroot->{node}, $svol->{node}{uuid}) ||
+           ($svol->{node}{uuid} eq $sroot->{node}{uuid}))) 
+      {
         DEBUG "Found \"$svol->{PRINT}\" (id=$svol->{node}{id}) in btrfs subtree of: $sroot->{PRINT}";
       } else {
         ABORTED($svol, "Not a child subvolume of: $sroot->{PRINT}");