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Use 'cgm listcontrollers' list rather than /proc/self/cgroups

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to populate the list of subsystems to use.

Cgmanager can be started with some subsystems disabled (i.e.
cgmanager -M cpuset).  If lxc using cgmanager then uses the
/proc/self/cgroup output to determine which controllers to use,
it will fail when trying to do things to cpuset.  Instead, ask
cgmanager which controllers to use.

This still defers (per patch 1/1) to the lxc.cgroup.use values.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
This commit is contained in:
Serge Hallyn 2015-05-01 21:11:28 +00:00 committed by Stéphane Graber
parent cb6d63a7aa
commit 7f7948206b
1 changed files with 39 additions and 2 deletions
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41
src/lxc/cgmanager.c
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@ -818,6 +818,25 @@ out:
return pids_len;
}
static bool lxc_list_controllers(char ***list)
{
if (!cgm_dbus_connect()) {
ERROR("Error connecting to cgroup manager");
return false;
}
if (cgmanager_list_controllers_sync(NULL, cgroup_manager, list) != 0) {
NihError *nerr;
nerr = nih_error_get();
ERROR("call to cgmanager_list_controllers_sync failed: %s", nerr->message);
nih_free(nerr);
cgm_dbus_disconnect();
return false;
}
cgm_dbus_disconnect();
return true;
}
static inline void free_abs_cgroup(char *cgroup)
{
if (!cgroup)
@ -1166,8 +1185,9 @@ static bool verify_and_prune(const char *cgroup_use)
static bool collect_subsytems(void)
{
char *line = NULL;
nih_local char **cgm_subsys_list = NULL;
size_t sz = 0;
FILE *f;
FILE *f = NULL;
if (subsystems) // already initialized
return true;
@ -1178,6 +1198,20 @@ static bool collect_subsytems(void)
subsystems_inone[0] = "all";
subsystems_inone[1] = NULL;
if (lxc_list_controllers(&cgm_subsys_list)) {
while (cgm_subsys_list[nr_subsystems]) {
char **tmp = NIH_MUST( realloc(subsystems,
(nr_subsystems+2)*sizeof(char *)) );
tmp[nr_subsystems] = NIH_MUST(
strdup(cgm_subsys_list[nr_subsystems++]) );
subsystems = tmp;
}
if (nr_subsystems)
subsystems[nr_subsystems] = NULL;
goto collected;
}
INFO("cgmanager_list_controllers failed, falling back to /proc/self/cgroups");
f = fopen_cloexec("/proc/self/cgroup", "r");
if (!f) {
f = fopen_cloexec("/proc/1/cgroup", "r");
@ -1219,6 +1253,8 @@ static bool collect_subsytems(void)
fclose(f);
free(line);
collected:
if (!nr_subsystems) {
ERROR("No cgroup subsystems found");
return false;
@ -1240,7 +1276,8 @@ out_good:
out_free:
free(line);
fclose(f);
if (f)
fclose(f);
free_subsystems();
return false;
}