systemd/0235-unit-check-for-mount-rate-limiting-before-checking-a.patch

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From 7131b76b1ef9382396cdc9dc1a23999d94bb79f8 Mon Sep 17 00:00:00 2001
From: Michal Sekletar <msekleta@redhat.com>
Date: Mon, 30 May 2022 11:55:41 +0200
Subject: [PATCH] unit: check for mount rate limiting before checking active
state
Having this check as part of mount_can_start() is too late because
UNIT(u)->can_start() virtual method is called after checking the active
state of unit in unit_start().
We need to hold off running mount start jobs when /p/s/mountinfo monitor
is rate limited even when given mount unit is already active.
Fixes #20329
(cherry picked from commit b161bc394b2cc8b271dda9208e310cc2af0cc29d)
Related: #2087652
---
src/core/mount.c | 3 ---
src/core/unit.c | 4 ++++
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/src/core/mount.c b/src/core/mount.c
index d63884e47e..8011389bcc 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -2169,9 +2169,6 @@ static int mount_can_start(Unit *u) {
assert(m);
- if (sd_event_source_is_ratelimited(u->manager->mount_event_source))
- return -EAGAIN;
-
r = unit_test_start_limit(u);
if (r < 0) {
mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
diff --git a/src/core/unit.c b/src/core/unit.c
index 6eaa553255..569f712e85 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -1848,6 +1848,10 @@ int unit_start(Unit *u) {
assert(u);
+ /* Let's hold off running start jobs for mount units when /proc/self/mountinfo monitor is rate limited. */
+ if (u->type == UNIT_MOUNT && sd_event_source_is_ratelimited(u->manager->mount_event_source))
+ return -EAGAIN;
+
/* If this is already started, then this will succeed. Note that this will even succeed if this unit
* is not startable by the user. This is relied on to detect when we need to wait for units and when
* waiting is finished. */