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From 4dbe6568d5bcc082b13f3ef4d323d1669f16095c Mon Sep 17 00:00:00 2001
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From: Michal Sekletar <msekleta@redhat.com>
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Date: Mon, 30 May 2022 11:55:41 +0200
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Subject: [PATCH] unit: check for mount rate limiting before checking active
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state
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Having this check as part of mount_can_start() is too late because
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UNIT(u)->can_start() virtual method is called after checking the active
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state of unit in unit_start().
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We need to hold off running mount start jobs when /p/s/mountinfo monitor
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is rate limited even when given mount unit is already active.
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Fixes #20329
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(cherry picked from commit b161bc394b2cc8b271dda9208e310cc2af0cc29d)
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Resolves: #2095744
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---
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src/core/mount.c | 3 ---
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src/core/unit.c | 4 ++++
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2 files changed, 4 insertions(+), 3 deletions(-)
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diff --git a/src/core/mount.c b/src/core/mount.c
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index 9547cb9b29..d37b5731f8 100644
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--- a/src/core/mount.c
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+++ b/src/core/mount.c
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@@ -1999,9 +1999,6 @@ static int mount_can_start(Unit *u) {
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assert(m);
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- if (sd_event_source_is_ratelimited(u->manager->mount_event_source))
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- return -EAGAIN;
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-
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r = unit_test_start_limit(u);
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if (r < 0) {
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mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
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diff --git a/src/core/unit.c b/src/core/unit.c
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index c00d30e837..0810bf5a58 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -1729,6 +1729,10 @@ int unit_start(Unit *u) {
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assert(u);
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+ /* Let's hold off running start jobs for mount units when /proc/self/mountinfo monitor is rate limited. */
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+ if (u->type == UNIT_MOUNT && sd_event_source_is_ratelimited(u->manager->mount_event_source))
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+ return -EAGAIN;
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+
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/* If this is already started, then this will succeed. Note that this will even succeed if this unit
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* is not startable by the user. This is relied on to detect when we need to wait for units and when
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* waiting is finished. */
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