From 05a0f33b0d0a650b25ce7955a171d725f9c3f5f6 Mon Sep 17 00:00:00 2001
From: licunlong <licunlong1@huawei.com>
Date: Thu, 6 May 2021 09:38:54 +0800
Subject: [PATCH] core-cgroup: support freezer.

This patch add support for freezer subsystem.
---
 meson.build                                   |  2 +
 meson_options.txt                             |  3 ++
 src/basic/cgroup-util.c                       |  1 +
 src/basic/cgroup-util.h                       |  5 +++
 src/core/cgroup.c                             | 16 +++++++
 src/core/cgroup.h                             |  4 ++
 src/core/dbus-cgroup.c                        | 29 +++++++++++++
 src/core/dbus-manager.c                       |  1 +
 src/core/load-fragment-gperf.gperf.in         |  2 +
 src/core/load-fragment.c                      | 33 ++++++++++++++
 src/core/load-fragment.h                      |  1 +
 src/core/main.c                               |  1 +
 src/core/manager.c                            |  2 +
 src/core/manager.h                            |  1 +
 src/core/system.conf.in                       |  1 +
 src/core/unit.c                               |  1 +
 src/shared/bus-unit-util.c                    | 11 +++++
 src/test/meson.build                          |  3 ++
 src/test/test-cgroup-freezer.c                | 43 +++++++++++++++++++
 src/test/test-cgroup-mask.c                   |  3 +-
 .../fuzz-unit-file/directives-all.service     |  2 +
 21 files changed, 164 insertions(+), 1 deletion(-)
 create mode 100644 src/test/test-cgroup-freezer.c

diff --git a/meson.build b/meson.build
index 614013b..8712bdb 100644
--- a/meson.build
+++ b/meson.build
@@ -1582,6 +1582,7 @@ foreach term : ['analyze',
                 'efi',
                 'environment-d',
                 'firstboot',
+                'freezer-cgv1',
                 'gshadow',
                 'hibernate',
                 'hostnamed',
@@ -2855,6 +2856,7 @@ foreach tuple : [
         ['standalone-binaries',    get_option('standalone-binaries')],
         ['coverage',               get_option('b_coverage')],
         ['cpuset-cgv1'],
+        ['freezer-cgv1'],
 ]
 
         if tuple.length() >= 2
diff --git a/meson_options.txt b/meson_options.txt
index 5fda5d9..b61d99d 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -517,3 +517,6 @@ option('bpf-framework', type : 'feature', deprecated : { 'true' : 'enabled', 'fa
 
 option('cpuset-cgv1', type : 'boolean', value : 'true',
        description : 'enable cgroup v1 cpuset support')
+
+option('freezer-cgv1', type : 'boolean', value : 'true',
+       description : 'enable cgroup v1 freezer support')
diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index abd1f91..3e60488 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -2359,6 +2359,7 @@ static const char *const cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
         [CGROUP_CONTROLLER_DEVICES] = "devices",
         [CGROUP_CONTROLLER_PIDS] = "pids",
         [CGROUP_CONTROLLER_CPUSET] = "cpuset",
+        [CGROUP_CONTROLLER_FREEZER] = "freezer",
         [CGROUP_CONTROLLER_BPF_FIREWALL] = "bpf-firewall",
         [CGROUP_CONTROLLER_BPF_DEVICES] = "bpf-devices",
         [CGROUP_CONTROLLER_BPF_FOREIGN] = "bpf-foreign",
diff --git a/src/basic/cgroup-util.h b/src/basic/cgroup-util.h
index dd3df28..4389cce 100644
--- a/src/basic/cgroup-util.h
+++ b/src/basic/cgroup-util.h
@@ -29,6 +29,7 @@ typedef enum CGroupController {
         CGROUP_CONTROLLER_DEVICES,    /* v1 only */
         CGROUP_CONTROLLER_PIDS,
         CGROUP_CONTROLLER_CPUSET,
+        CGROUP_CONTROLLER_FREEZER,
 
         /* BPF-based pseudo-controllers, v2 only */
         CGROUP_CONTROLLER_BPF_FIREWALL,
@@ -57,6 +58,7 @@ typedef enum CGroupMask {
         CGROUP_MASK_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICES),
         CGROUP_MASK_PIDS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_PIDS),
         CGROUP_MASK_CPUSET = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUSET),
+        CGROUP_MASK_FREEZER = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_FREEZER),
         CGROUP_MASK_BPF_FIREWALL = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_FIREWALL),
         CGROUP_MASK_BPF_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_DEVICES),
         CGROUP_MASK_BPF_FOREIGN = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BPF_FOREIGN),
@@ -67,6 +69,9 @@ typedef enum CGroupMask {
         CGROUP_MASK_V1 = CGROUP_MASK_CPU|CGROUP_MASK_CPUACCT|CGROUP_MASK_BLKIO|CGROUP_MASK_MEMORY|CGROUP_MASK_DEVICES|CGROUP_MASK_PIDS
 #if ENABLE_CPUSET_CGV1
         | CGROUP_MASK_CPUSET
+#endif
+#if ENABLE_FREEZER_CGV1
+        | CGROUP_MASK_FREEZER
 #endif
         ,
 
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index cd1e97d..3e47f76 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -179,6 +179,7 @@ void cgroup_context_init(CGroupContext *c) {
                 .startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID,
 
                 .tasks_max = CGROUP_TASKS_MAX_UNSET,
+                .freezer_state = NULL,
 
                 .moom_swap = MANAGED_OOM_AUTO,
                 .moom_mem_pressure = MANAGED_OOM_AUTO,
@@ -304,6 +305,9 @@ void cgroup_context_done(CGroupContext *c) {
         cpu_set_reset(&c->cpuset_mems2);
         cpu_set_reset(&c->startup_cpuset_mems2);
 
+        if (c->freezer_state)
+                c->freezer_state = mfree(c->freezer_state);
+
         c->delegate_subgroup = mfree(c->delegate_subgroup);
 
         nft_set_context_clear(&c->nft_set_context);
@@ -542,6 +546,7 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
                 "%sBlockIOAccounting: %s\n"
                 "%sMemoryAccounting: %s\n"
                 "%sCPUSetAccounting: %s\n"
+                "%sFreezerAccounting=%s\n"
                 "%sTasksAccounting: %s\n"
                 "%sIPAccounting: %s\n"
                 "%sCPUWeight: %" PRIu64 "\n"
@@ -577,6 +582,7 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
                 "%sCPUSetCloneChildren=%s\n"
                 "%sCPUSetMemMigrate=%s\n"
                 "%sTasksMax: %" PRIu64 "\n"
+                "%sFreezerState=%s\n"
                 "%sDevicePolicy: %s\n"
                 "%sDisableControllers: %s\n"
                 "%sDelegate: %s\n"
@@ -591,6 +597,7 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
                 prefix, yes_no(c->blockio_accounting),
                 prefix, yes_no(c->memory_accounting),
                 prefix, yes_no(c->cpuset_accounting),
+                prefix, yes_no(c->freezer_accounting),
                 prefix, yes_no(c->tasks_accounting),
                 prefix, yes_no(c->ip_accounting),
                 prefix, c->cpu_weight,
@@ -626,6 +633,7 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
                 prefix, yes_no(c->cpuset_clone_children),
                 prefix, yes_no(c->cpuset_memory_migrate),
                 prefix, cgroup_tasks_max_resolve(&c->tasks_max),
+                prefix, c->freezer_state,
                 prefix, cgroup_device_policy_to_string(c->device_policy),
                 prefix, strempty(disable_controllers_str),
                 prefix, delegate_str,
@@ -1957,6 +1965,11 @@ static void cgroup_context_apply(
                 }
         }
 
+        if ((apply_mask & CGROUP_MASK_FREEZER) && !is_local_root) {
+                if (c->freezer_state)
+                        (void) set_attribute_and_warn(u, "freezer", "freezer.state", c->freezer_state);
+        }
+
         /* On cgroup v2 we can apply BPF everywhere. On cgroup v1 we apply it everywhere except for the root of
          * containers, where we leave this to the manager */
         if ((apply_mask & (CGROUP_MASK_DEVICES | CGROUP_MASK_BPF_DEVICES)) &&
@@ -2115,6 +2128,9 @@ static CGroupMask unit_get_cgroup_mask(Unit *u) {
             c->cpuset_mems)
                 mask |= CGROUP_MASK_CPUSET;
 
+        if (c->freezer_accounting || c->freezer_state)
+                mask |= CGROUP_MASK_FREEZER;
+
         if (c->device_allow ||
             c->device_policy != CGROUP_DEVICE_POLICY_AUTO)
                 mask |= CGROUP_MASK_DEVICES | CGROUP_MASK_BPF_DEVICES;
diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index 04a7f25..7fb792a 100644
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -135,6 +135,7 @@ struct CGroupContext {
         bool blockio_accounting;
         bool memory_accounting;
         bool cpuset_accounting;
+        bool freezer_accounting;
         bool tasks_accounting;
         bool ip_accounting;
 
@@ -228,6 +229,9 @@ struct CGroupContext {
         /* Common */
         CGroupTasksMax tasks_max;
 
+        /* Freezer */
+        char *freezer_state;
+
         /* Settings for systemd-oomd */
         ManagedOOMMode moom_swap;
         ManagedOOMMode moom_mem_pressure;
diff --git a/src/core/dbus-cgroup.c b/src/core/dbus-cgroup.c
index 05fd445..052049c 100644
--- a/src/core/dbus-cgroup.c
+++ b/src/core/dbus-cgroup.c
@@ -493,6 +493,8 @@ const sd_bus_vtable bus_cgroup_vtable[] = {
         SD_BUS_PROPERTY("CPUSetMems", "s", NULL, offsetof(CGroupContext, cpuset_mems), 0),
         SD_BUS_PROPERTY("CPUSetCloneChildren", "b", bus_property_get_bool, offsetof(CGroupContext, cpuset_clone_children), 0),
         SD_BUS_PROPERTY("CPUSetMemMigrate", "b", bus_property_get_bool, offsetof(CGroupContext, cpuset_memory_migrate), 0),
+        SD_BUS_PROPERTY("FreezerAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, freezer_accounting), 0),
+        SD_BUS_PROPERTY("FreezerState", "s", NULL, offsetof(CGroupContext, freezer_state), 0),
         SD_BUS_PROPERTY("DevicePolicy", "s", property_get_cgroup_device_policy, offsetof(CGroupContext, device_policy), 0),
         SD_BUS_PROPERTY("DeviceAllow", "a(ss)", property_get_device_allow, 0, 0),
         SD_BUS_PROPERTY("TasksAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, tasks_accounting), 0),
@@ -1287,6 +1289,9 @@ int bus_cgroup_set_property(
         if (streq(name, "CPUSetAccounting"))
                 return bus_cgroup_set_boolean(u, name, &c->cpuset_accounting, CGROUP_MASK_CPUSET, message, flags, error);
 
+        if (streq(name, "FreezerAccounting"))
+                return bus_cgroup_set_boolean(u, name, &c->freezer_accounting, CGROUP_MASK_FREEZER, message, flags, error);
+
         if (STR_IN_SET(name, "CPUSetCpus", "CPUSetMems")) {
                 const char *cpuset_str = NULL;
 
@@ -1321,6 +1326,30 @@ int bus_cgroup_set_property(
         if (streq(name, "CPUSetMemMigrate"))
                 return bus_cgroup_set_boolean(u, name, &c->cpuset_memory_migrate, CGROUP_MASK_CPUSET, message, flags, error);
 
+        if (streq(name, "FreezerState")) {
+                const char *state = NULL;
+
+                r = sd_bus_message_read(message, "s", &state);
+                if (r < 0)
+                        return r;
+
+                if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
+                        unit_invalidate_cgroup(u, CGROUP_MASK_FREEZER);
+
+                        if (c->freezer_state) {
+                                free(c->freezer_state);
+                                c->freezer_state = NULL;
+                        }
+
+                        c->freezer_state = strdup(state);
+                        if (!c->freezer_state)
+                                return -ENOMEM;
+
+                        unit_write_settingf(u, flags, name, "FreezerState=%s", state);
+                }
+                return 1;
+        }
+
         if (streq(name, "TasksAccounting"))
                 return bus_cgroup_set_boolean(u, name, &c->tasks_accounting, CGROUP_MASK_PIDS, message, flags, error);
 
diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
index fc49e7d..0f9d4e8 100644
--- a/src/core/dbus-manager.c
+++ b/src/core/dbus-manager.c
@@ -3006,6 +3006,7 @@ const sd_bus_vtable bus_manager_vtable[] = {
         SD_BUS_PROPERTY("DefaultIPAccounting", "b", bus_property_get_bool, offsetof(Manager, defaults.ip_accounting), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("DefaultMemoryAccounting", "b", bus_property_get_bool, offsetof(Manager, defaults.memory_accounting), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("DefaultCpusetAccounting", "b", bus_property_get_bool, offsetof(Manager, defaults.cpuset_accounting), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("DefaultFreezerAccounting", "b", bus_property_get_bool, offsetof(Manager, defaults.freezer_accounting), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("DefaultTasksAccounting", "b", bus_property_get_bool, offsetof(Manager, defaults.tasks_accounting), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("DefaultLimitCPU", "t", bus_property_get_rlimit, offsetof(Manager, defaults.rlimit[RLIMIT_CPU]), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("DefaultLimitCPUSoft", "t", bus_property_get_rlimit, offsetof(Manager, defaults.rlimit[RLIMIT_CPU]), SD_BUS_VTABLE_PROPERTY_CONST),
diff --git a/src/core/load-fragment-gperf.gperf.in b/src/core/load-fragment-gperf.gperf.in
index 1e46af4..1e5b7ab 100644
--- a/src/core/load-fragment-gperf.gperf.in
+++ b/src/core/load-fragment-gperf.gperf.in
@@ -226,6 +226,8 @@
 {{type}}.CPUSetMems,                       config_parse_cpuset_cpumems,                 0,                                  offsetof({{type}}, cgroup_context.cpuset_mems)
 {{type}}.CPUSetCloneChildren,              config_parse_bool,                           0,                                  offsetof({{type}}, cgroup_context.cpuset_clone_children)
 {{type}}.CPUSetMemMigrate,                 config_parse_bool,                           0,                                  offsetof({{type}}, cgroup_context.cpuset_memory_migrate)
+{{type}}.FreezerAccounting,                config_parse_bool,                           0,                                  offsetof({{type}}, cgroup_context.freezer_accounting)
+{{type}}.FreezerState,                     config_parse_freezer_state,                  0,                                  offsetof({{type}}, cgroup_context.freezer_state)
 {{type}}.DeviceAllow,                      config_parse_device_allow,                   0,                                  offsetof({{type}}, cgroup_context)
 {{type}}.DevicePolicy,                     config_parse_device_policy,                  0,                                  offsetof({{type}}, cgroup_context.device_policy)
 {{type}}.IOAccounting,                     config_parse_bool,                           0,                                  offsetof({{type}}, cgroup_context.io_accounting)
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index cbc75e1..8648fb1 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -3973,6 +3973,39 @@ int config_parse_cpuset_cpumems(
      return 0;
 }
 
+int config_parse_freezer_state(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        char **freezer_state = data;
+        char *pinstr = NULL;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (!STR_IN_SET(rvalue, "FROZEN", "THAWED")) {
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Freezer state '%s' is invalid, Ignoring.", rvalue);
+                return 0;
+        }
+
+        pinstr = strdup(rvalue);
+        if (!pinstr)
+                return log_oom();
+
+        free(*freezer_state);
+        *freezer_state = pinstr;
+        return 0;
+}
+
 int config_parse_tasks_max(
                 const char *unit,
                 const char *filename,
diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h
index 0b77c8b..f9ffbf4 100644
--- a/src/core/load-fragment.h
+++ b/src/core/load-fragment.h
@@ -85,6 +85,7 @@ CONFIG_PARSER_PROTOTYPE(config_parse_cg_cpu_weight);
 CONFIG_PARSER_PROTOTYPE(config_parse_cpu_shares);
 CONFIG_PARSER_PROTOTYPE(config_parse_memory_limit);
 CONFIG_PARSER_PROTOTYPE(config_parse_cpuset_cpumems);
+CONFIG_PARSER_PROTOTYPE(config_parse_freezer_state);
 CONFIG_PARSER_PROTOTYPE(config_parse_tasks_max);
 CONFIG_PARSER_PROTOTYPE(config_parse_delegate);
 CONFIG_PARSER_PROTOTYPE(config_parse_delegate_subgroup);
diff --git a/src/core/main.c b/src/core/main.c
index de3f536..96b0a11 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -679,6 +679,7 @@ static int parse_config_file(void) {
                 { "Manager", "DefaultBlockIOAccounting",     config_parse_bool,                  0,                        &arg_defaults.blockio_accounting  },
                 { "Manager", "DefaultMemoryAccounting",      config_parse_bool,                  0,                        &arg_defaults.memory_accounting   },
                 { "Manager", "DefaultCpusetAccounting",      config_parse_bool,                  0,                        &arg_defaults.cpuset_accounting   },
+                { "Manager", "DefaultFreezerAccounting",     config_parse_bool,                  0,                        &arg_defaults.freezer_accounting   },
                 { "Manager", "DefaultTasksAccounting",       config_parse_bool,                  0,                        &arg_defaults.tasks_accounting    },
                 { "Manager", "DefaultTasksMax",              config_parse_tasks_max,             0,                        &arg_defaults.tasks_max           },
                 { "Manager", "DefaultMemoryPressureThresholdSec", config_parse_sec,              0,                        &arg_defaults.memory_pressure_threshold_usec },
diff --git a/src/core/manager.c b/src/core/manager.c
index ef22fed..b29d4e1 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -4193,6 +4193,7 @@ int manager_set_unit_defaults(Manager *m, const UnitDefaults *defaults) {
         m->defaults.cpu_accounting = defaults->cpu_accounting;
         m->defaults.memory_accounting = defaults->memory_accounting;
         m->defaults.cpuset_accounting = defaults->cpuset_accounting;
+        m->defaults.freezer_accounting = defaults->freezer_accounting;
         m->defaults.io_accounting = defaults->io_accounting;
         m->defaults.blockio_accounting = defaults->blockio_accounting;
         m->defaults.tasks_accounting = defaults->tasks_accounting;
@@ -4963,6 +4964,7 @@ void unit_defaults_init(UnitDefaults *defaults, RuntimeScope scope) {
                 .cpu_accounting = cpu_accounting_is_cheap(),
                 .memory_accounting = MEMORY_ACCOUNTING_DEFAULT,
                 .cpuset_accounting = false,
+                .freezer_accounting = false,
                 .io_accounting = false,
                 .blockio_accounting = false,
                 .tasks_accounting = true,
diff --git a/src/core/manager.h b/src/core/manager.h
index e560811..93e9d2a 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -166,6 +166,7 @@ typedef struct UnitDefaults {
         bool io_accounting;
         bool blockio_accounting;
         bool cpuset_accounting;
+        bool freezer_accounting;
         bool tasks_accounting;
         bool ip_accounting;
 
diff --git a/src/core/system.conf.in b/src/core/system.conf.in
index 69ea5d6..dbdc47c 100644
--- a/src/core/system.conf.in
+++ b/src/core/system.conf.in
@@ -58,6 +58,7 @@
 #DefaultIPAccounting=no
 #DefaultMemoryAccounting={{ 'yes' if MEMORY_ACCOUNTING_DEFAULT else 'no' }}
 #DefaultCpusetAccounting=
+#DefaultFreezerAccounting=no
 #DefaultTasksAccounting=yes
 #DefaultTasksMax=80%
 #DefaultLimitCPU=
diff --git a/src/core/unit.c b/src/core/unit.c
index 38017d0..c069018 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -189,6 +189,7 @@ static void unit_init(Unit *u) {
                 cc->blockio_accounting = u->manager->defaults.blockio_accounting;
                 cc->memory_accounting = u->manager->defaults.memory_accounting;
                 cc->cpuset_accounting = u->manager->defaults.cpuset_accounting;
+                cc->freezer_accounting = u->manager->defaults.freezer_accounting;
                 cc->tasks_accounting = u->manager->defaults.tasks_accounting;
                 cc->ip_accounting = u->manager->defaults.ip_accounting;
 
diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index a8f493e..6390986 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -568,6 +568,7 @@ static int bus_append_cgroup_property(sd_bus_message *m, const char *field, cons
                               "IPAccounting",
                               "CoredumpReceive",
                               "CPUSetAccounting",
+                              "FreezerAccounting",
                               "CPUSetCloneChildren",
                               "CPUSetMemMigrate"))
                 return bus_append_parse_boolean(m, field, eq);
@@ -685,6 +686,16 @@ static int bus_append_cgroup_property(sd_bus_message *m, const char *field, cons
                 return 1;
         }
 
+        if (streq(field, "FreezerState")) {
+                if (STR_IN_SET(eq, "FROZEN", "THAWED"))
+                        r = sd_bus_message_append(m, "(sv)", field, "s", eq);
+                else
+                        r = -EINVAL;
+                if (r < 0)
+                        return bus_log_create_error(r);
+                return 1;
+        }
+
         if (streq(field, "CPUQuota")) {
                 if (isempty(eq))
                         r = sd_bus_message_append(m, "(sv)", "CPUQuotaPerSecUSec", "t", USEC_INFINITY);
diff --git a/src/test/meson.build b/src/test/meson.build
index a59461a..a7ca76e 100644
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -484,6 +484,9 @@ executables += [
                 'sources' : files('test-cgroup-mask.c'),
                 'dependencies' : common_test_dependencies,
         },
+        core_test_template + {
+                'sources' : files('test-cgroup-freezer.c'),
+        },
         core_test_template + {
                 'sources' : files('test-cgroup-unit-default.c'),
         },
diff --git a/src/test/test-cgroup-freezer.c b/src/test/test-cgroup-freezer.c
new file mode 100644
index 0000000..a533d16
--- /dev/null
+++ b/src/test/test-cgroup-freezer.c
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "load-fragment.h"
+#include "string-util.h"
+
+static void test_config_parse_freezer_state(void) {
+       /* int config_parse_freezer_state(
+                 const char *unit,
+                 const char *filename,
+                 unsigned line,
+                 const char *section,
+                 unsigned section_line,
+                 const char *lvalue,
+                 int ltype,
+                 const char *rvalue,
+                 void *data,
+                 void *userdata) */
+        int r;
+        _cleanup_free_ char *pstate = NULL;
+
+        r = config_parse_freezer_state(NULL, "fake", 1, "section", 1, "FreezerState", 0, "FROZEN", &pstate, NULL);
+        assert_se(r >= 0);
+        assert_se(streq(pstate, "FROZEN"));
+
+        pstate = mfree(pstate);
+        r = config_parse_freezer_state(NULL, "fake", 1, "section", 1, "FreezerState", 0, "THAWED", &pstate, NULL);
+        assert_se(r >= 0);
+        assert_se(streq(pstate, "THAWED"));
+
+        pstate = mfree(pstate);
+        r = config_parse_freezer_state(NULL, "fake", 1, "section", 1, "FreezerState", 0, "test", &pstate, NULL);
+        assert_se(r >= 0);
+        assert_se(!pstate);
+
+        r = config_parse_freezer_state(NULL, "fake", 1, "section", 1, "FreezerState", 0, "", &pstate, NULL);
+        assert_se(r >= 0);
+        assert_se(!pstate);
+}
+
+int main(int argc, char *argv[]){
+        test_config_parse_freezer_state();
+        return 0;
+}
diff --git a/src/test/test-cgroup-mask.c b/src/test/test-cgroup-mask.c
index 37ec6d6..e0574d9 100644
--- a/src/test/test-cgroup-mask.c
+++ b/src/test/test-cgroup-mask.c
@@ -56,6 +56,7 @@ TEST_RET(cgroup_mask, .sd_booted = true) {
         m->defaults.cpu_accounting =
                 m->defaults.memory_accounting =
                 m->defaults.cpuset_accounting =
+                m->defaults.freezer_accounting =
                 m->defaults.blockio_accounting =
                 m->defaults.io_accounting =
                 m->defaults.tasks_accounting = false;
@@ -141,7 +142,7 @@ static void test_cg_mask_to_string_one(CGroupMask mask, const char *t) {
 
 TEST(cg_mask_to_string) {
         test_cg_mask_to_string_one(0, NULL);
-        test_cg_mask_to_string_one(_CGROUP_MASK_ALL, "cpu cpuacct cpuset2 io blkio memory devices pids cpuset bpf-firewall bpf-devices bpf-foreign bpf-socket-bind bpf-restrict-network-interfaces");
+        test_cg_mask_to_string_one(_CGROUP_MASK_ALL, "cpu cpuacct cpuset2 io blkio memory devices pids cpuset freezer bpf-firewall bpf-devices bpf-foreign bpf-socket-bind bpf-restrict-network-interfaces");
         test_cg_mask_to_string_one(CGROUP_MASK_CPU, "cpu");
         test_cg_mask_to_string_one(CGROUP_MASK_CPUACCT, "cpuacct");
         test_cg_mask_to_string_one(CGROUP_MASK_CPUSET2, "cpuset2");
diff --git a/test/fuzz/fuzz-unit-file/directives-all.service b/test/fuzz/fuzz-unit-file/directives-all.service
index 0e953f2..123c98e 100644
--- a/test/fuzz/fuzz-unit-file/directives-all.service
+++ b/test/fuzz/fuzz-unit-file/directives-all.service
@@ -115,6 +115,8 @@ FileDescriptorName=
 FileDescriptorStoreMax=
 ForceUnmount=
 FreeBind=
+FreezerAccounting=
+FreezerState=
 Group=
 GuessMainPID=
 IOAccounting=
-- 
2.41.0