From 864fb097621df32df229e3192cf3a757437a9535 Mon Sep 17 00:00:00 2001
From: Logan G <logan@qtechofficial.com>
Date: Fri, 24 Feb 2023 21:55:28 -0700
Subject: [PATCH] First version (not tested)

---
 etc/systemd/system/btrfs-maintenance.service | 10 +++++++
 etc/systemd/system/btrfs-maintenance.timer   |  9 ++++++
 usr/local/bin/btrfs-maintenance              | 30 ++++++++++++++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 etc/systemd/system/btrfs-maintenance.service
 create mode 100644 etc/systemd/system/btrfs-maintenance.timer
 create mode 100755 usr/local/bin/btrfs-maintenance

diff --git a/etc/systemd/system/btrfs-maintenance.service b/etc/systemd/system/btrfs-maintenance.service
new file mode 100644
index 0000000..763045f
--- /dev/null
+++ b/etc/systemd/system/btrfs-maintenance.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=Run BTRFS maintenance (scrubs and rebalance)
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/btrfs-maintenance
+RemainAfterExit=yes
+
+[Install]
+WantedBy=default.target
diff --git a/etc/systemd/system/btrfs-maintenance.timer b/etc/systemd/system/btrfs-maintenance.timer
new file mode 100644
index 0000000..1a9eb7e
--- /dev/null
+++ b/etc/systemd/system/btrfs-maintenance.timer
@@ -0,0 +1,9 @@
+[Unit]
+Description=Run BTRFS maintenance stuff (scrub and rebalance) monthly
+
+[Timer]
+OnCalendar=*-*-01 02:00:00
+Persistent=true
+
+[Install]
+WantedBy=timers.target
\ No newline at end of file
diff --git a/usr/local/bin/btrfs-maintenance b/usr/local/bin/btrfs-maintenance
new file mode 100755
index 0000000..b7942c0
--- /dev/null
+++ b/usr/local/bin/btrfs-maintenance
@@ -0,0 +1,30 @@
+#!/bin/bash
+set -e
+
+# Find all BTRFS formatted partitions
+PARTITIONS=()
+for i in $(lsblk -nrpo "name" -e 1,7,11); do
+    if [[ "$(lsblk -no FSTYPE "$i")" == "btrfs" ]]; then
+        PARTITIONS+=("$i")
+    fi
+done
+
+# Reallocate blocks that are less than 95% used
+for i in ${PARTITIONS[*]}; do
+    echo "Balance: $i"
+    btrfs balance start -dusage=95 "$i" &
+done
+
+# Wait for balance operations to finish
+wait
+
+# Scrub all partitions
+for i in ${PARTITIONS[*]}; do
+    echo "Scrub: $i"
+    btrfs scrub start -B "$i" &
+done
+
+# Wait for scrub operations to finish
+wait
+
+exit 0