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cgroup.c: clean up for handle_cgroup_settings

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Clean up the nesting if, make the logic similar for memory
and cpuset, and the error message should sent from inside,
for better extendibility.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Qiang Huang 2014-01-20 16:37:06 +08:00 committed by Serge Hallyn
parent 55fc19a104
commit 032e28b767
1 changed files with 40 additions and 23 deletions
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63
src/lxc/cgroup.c
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@ -848,10 +848,8 @@ struct cgroup_process_info *lxc_cgroupfs_create(const char *name, const char *pa
if (lxc_string_in_array("ns", (const char **)h->subsystems))
continue;
if (handle_cgroup_settings(mp, info_ptr->cgroup_path) < 0) {
ERROR("Could not set clone_children to 1 for cpuset hierarchy in parent cgroup.");
if (handle_cgroup_settings(mp, info_ptr->cgroup_path) < 0)
goto out_initial_error;
}
}
/* normalize the path */
@ -2084,47 +2082,66 @@ static int handle_cgroup_settings(struct cgroup_mount_point *mp,
{
int r, saved_errno = 0;
char buf[2];
const char **subsystems = (const char **)mp->hierarchy->subsystems;
/* If this is the memory cgroup, we want to enforce hierarchy.
* But don't fail if for some reason we can't.
*/
if (lxc_string_in_array("memory", (const char **)mp->hierarchy->subsystems)) {
char *cc_path = cgroup_to_absolute_path(mp, cgroup_path, "/memory.use_hierarchy");
if (cc_path) {
r = lxc_read_from_file(cc_path, buf, 1);
if (r < 1 || buf[0] != '1') {
r = lxc_write_to_file(cc_path, "1", 1, false);
if (r < 0)
SYSERROR("failed to set memory.use_hiararchy to 1; continuing");
}
if (lxc_string_in_array("memory", subsystems)) {
char *cc_path = cgroup_to_absolute_path(mp, cgroup_path,
"/memory.use_hierarchy");
if (!cc_path)
goto cpuset;
r = lxc_read_from_file(cc_path, buf, 1);
if (r == 1 && buf[0] == '1') {
free(cc_path);
goto cpuset;
}
}
r = lxc_write_to_file(cc_path, "1", 1, false);
if (r < 0)
SYSERROR("Failed to set memory.use_hiararchy to 1; continuing");
free(cc_path);
}
/* if this is a cpuset hierarchy, we have to set cgroup.clone_children in
* the base cgroup, otherwise containers will start with an empty cpuset.mems
* and cpuset.cpus and then
*/
if (lxc_string_in_array("cpuset", (const char **)mp->hierarchy->subsystems)) {
char *cc_path = cgroup_to_absolute_path(mp, cgroup_path, "/cgroup.clone_children");
cpuset:
if (lxc_string_in_array("cpuset", subsystems)) {
struct stat sb;
char *cc_path = cgroup_to_absolute_path(mp, cgroup_path,
"/cgroup.clone_children");
if (!cc_path)
return -1;
if (stat(cc_path, &sb) != 0 && errno == ENOENT)
return 0;
goto err;
if (stat(cc_path, &sb) != 0 && errno == ENOENT) {
free(cc_path);
goto out;
}
r = lxc_read_from_file(cc_path, buf, 1);
if (r == 1 && buf[0] == '1') {
free(cc_path);
return 0;
goto out;
}
r = lxc_write_to_file(cc_path, "1", 1, false);
saved_errno = errno;
free(cc_path);
errno = saved_errno;
return r < 0 ? -1 : 0;
if (r < 0) {
SYSERROR("Failed to set clone_children to 1 for cpuset hierarchy in parent cgroup.");
saved_errno = errno;
free(cc_path);
errno = saved_errno;
goto err;
}
free(cc_path);
}
out:
return 0;
err:
return -1;
}
extern void lxc_monitor_send_state(const char *name, lxc_state_t state,