From 8eebd8ecda4e1ad18b52ae2349c6472083891a1e Mon Sep 17 00:00:00 2001
From: Ian Kelling <ian@iankelling.org>
Date: Thu, 3 Oct 2024 07:18:15 -0400
Subject: [PATCH] minor docs fix

---
 filesystem/usr/local/bin/mount-latest-subvol | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/filesystem/usr/local/bin/mount-latest-subvol b/filesystem/usr/local/bin/mount-latest-subvol
index 602ca52..376b0d8 100755
--- a/filesystem/usr/local/bin/mount-latest-subvol
+++ b/filesystem/usr/local/bin/mount-latest-subvol
@@ -183,11 +183,13 @@ expire-leaf-vols() {
   done
 }
 
-# Check if subvol $1 is different than its btrbk parent subvol, delete it if not.
+# Usage: dedupe-btrbk SUBVOL_PATH
+#
+# Check if subvol at SUBVOL_PATH is a duplicate of its btrbk parent subvol, and delete if so.
 #
 # Silently give up if $1 is not a child of a btrbk subvol.
 #
-# Input vars: $root_dir (from get-btrfs-root-mountpoint)
+# Input vars: $vol $root_dir (from get-btrfs-root-mounts)
 dedupe-btrbk() {
   local parentid subvol parent_sub i lines tmpstr
   local -a bsubs
@@ -202,7 +204,8 @@ dedupe-btrbk() {
     fi
   done
   if [[ ! $parent_sub ]]; then
-    d "Warning: failed to find parent of subvol=$subvol in dir: $root_dir/btrbk"
+    # This is expected to happen often. The parent gets expired.
+    # d "Warning: failed to find parent of subvol=$subvol in dir: $root_dir/btrbk"
     return 0
   fi
   # in testing, same subvol is 136 bytes. allow some overhead. 32 happens sometimes under systemd.
-- 
2.30.2