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util-lib: add debug messages when checking cgroup layout

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This has become very complex, let's make it a bit easier to diagnose.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2017-11-15 10:04:29 +01:00
parent 47a78d4102
commit 9aa2113365
1 changed files with 12 additions and 5 deletions
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17
src/basic/cgroup-util.c
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@ -2449,24 +2449,31 @@ static int cg_unified_update(void) {
return 0;
if (statfs("/sys/fs/cgroup/", &fs) < 0)
return -errno;
return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/\" failed: %m");
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
log_debug("Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy");
unified_cache = CGROUP_UNIFIED_ALL;
else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
} else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 &&
F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
log_debug("Found cgroup2 on /sys/fs/cgroup/unified, unified hierarchy for systemd controller");
unified_cache = CGROUP_UNIFIED_SYSTEMD;
unified_systemd_v232 = false;
} else if (statfs("/sys/fs/cgroup/systemd/", &fs) == 0 &&
F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
log_debug("Found cgroup2 on /sys/fs/cgroup/systemd, unified hierarchy for systemd controller (v232 variant)");
unified_cache = CGROUP_UNIFIED_SYSTEMD;
unified_systemd_v232 = true;
} else {
if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
return -errno;
if (!F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC))
return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/systemd\" failed: %m");
if (!F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC)) {
log_debug("Unexpected filesystem type %llx mounted on /sys/fs/cgroup/systemd.",
(unsigned long long) fs.f_type);
return -ENOMEDIUM;
}
log_debug("Found cgroup on /sys/fs/cgroup/systemd, legacy hierarchy");
unified_cache = CGROUP_UNIFIED_NONE;
}
} else {