From 466266c1728e3b53b7020e4c0165c3e88576b805 Mon Sep 17 00:00:00 2001
From: Michal Sekletar <msekleta@redhat.com>
Date: Tue, 2 Aug 2022 12:38:30 +0200
Subject: [PATCH] rules: import previous SYSTEMD_READY state for suspended DM
 devices and skip other rules
 
We can't get any FS meta-data from a suspended device. Hence defer
making any plugged/unplugged decisions, i.e. we just import whatever was
previous state and skip processing all other rules.
 
Thanks Lennart Poettering <lennart@poettering.net> for suggesting this
solution.
---
 rules/99-systemd.rules.in                  | 6 ++++++
 test/fuzz/fuzz-udev-rules/99-systemd.rules | 6 ++++++
 2 files changed, 12 insertions(+)
 
diff --git a/rules/99-systemd.rules.in b/rules/99-systemd.rules.in
index 25b8a590a6..3dbba1f850 100644
--- a/rules/99-systemd.rules.in
+++ b/rules/99-systemd.rules.in
@@ -15,12 +15,18 @@ KERNEL=="vport*", TAG+="systemd"
 SUBSYSTEM=="ubi", TAG+="systemd"
 
 SUBSYSTEM=="block", TAG+="systemd"
+
+# We can't make any conclusions about suspended DM devices so let's just import previous SYSTEMD_READY state and skip other rules
+SUBSYSTEM=="block", ENV{DM_SUSPENDED}=="1", IMPORT{db}="SYSTEMD_READY", GOTO="systemd_end"
 SUBSYSTEM=="block", ACTION=="add", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", ENV{SYSTEMD_READY}="0"
 
 # Ignore encrypted devices with no identified superblock on it, since
 # we are probably still calling mke2fs or mkswap on it.
 SUBSYSTEM=="block", ENV{DM_UUID}=="CRYPT-*", ENV{ID_PART_TABLE_TYPE}=="", ENV{ID_FS_USAGE}=="", ENV{SYSTEMD_READY}="0"
 
+# Explicitly set SYSTEMD_READY=1 for DM devices that don't have it set yet, so that we always have something to import above
+SUBSYSTEM=="block", ENV{DM_UUID}=="?*", ENV{SYSTEMD_READY}=="", ENV{SYSTEMD_READY}="1"
+
 # add symlink to GPT root disk
 SUBSYSTEM=="block", ENV{ID_PART_GPT_AUTO_ROOT}=="1", ENV{ID_FS_TYPE}!="crypto_LUKS", SYMLINK+="gpt-auto-root"
 SUBSYSTEM=="block", ENV{ID_PART_GPT_AUTO_ROOT}=="1", ENV{ID_FS_TYPE}=="crypto_LUKS", SYMLINK+="gpt-auto-root-luks"
diff --git a/test/fuzz/fuzz-udev-rules/99-systemd.rules b/test/fuzz/fuzz-udev-rules/99-systemd.rules
index e8a0f5a739..278383b02c 100644
--- a/test/fuzz/fuzz-udev-rules/99-systemd.rules
+++ b/test/fuzz/fuzz-udev-rules/99-systemd.rules
@@ -15,12 +15,18 @@ KERNEL=="vport*", TAG+="systemd"
 SUBSYSTEM=="ubi", TAG+="systemd"
 
 SUBSYSTEM=="block", TAG+="systemd"
+
+# We can't make any conclusions about suspended DM devices so let's just import previous SYSTEMD_READY state and skip other rules
+SUBSYSTEM=="block", ENV{DM_SUSPENDED}=="1", IMPORT{db}="SYSTEMD_READY", GOTO="systemd_end"
 SUBSYSTEM=="block", ACTION=="add", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", ENV{SYSTEMD_READY}="0"
 
 # Ignore encrypted devices with no identified superblock on it, since
 # we are probably still calling mke2fs or mkswap on it.
 SUBSYSTEM=="block", ENV{DM_UUID}=="CRYPT-*", ENV{ID_PART_TABLE_TYPE}=="", ENV{ID_FS_USAGE}=="", ENV{SYSTEMD_READY}="0"
 
+# Explicitly set SYSTEMD_READY=1 for DM devices that don't have it set yet, so that we always have something to import above
+SUBSYSTEM=="block", ENV{DM_UUID}=="?*", ENV{SYSTEMD_READY}=="", ENV{SYSTEMD_READY}="1"
+
 # add symlink to GPT root disk
 SUBSYSTEM=="block", ENV{ID_PART_GPT_AUTO_ROOT}=="1", ENV{ID_FS_TYPE}!="crypto_LUKS", SYMLINK+="gpt-auto-root"
 SUBSYSTEM=="block", ENV{ID_PART_GPT_AUTO_ROOT}=="1", ENV{ID_FS_TYPE}=="crypto_LUKS", SYMLINK+="gpt-auto-root-luks"
-- 
2.33.0
 
