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cgroups: fix cgroup settings sorting

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2021-08-27 10:17:01 +02:00
parent 8ab50a9bfc
commit bca286f2d7
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GPG Key ID: 8EB056D53EECB12D
3 changed files with 26 additions and 24 deletions
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26
src/lxc/cgroups/cgfsng.c
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@ -2703,6 +2703,32 @@ static int cg_legacy_set_data(struct cgroup_ops *ops, const char *filename,
return lxc_write_openat(h->path_lim, filename, value, strlen(value)); return lxc_write_openat(h->path_lim, filename, value, strlen(value));
} }
/*
* Return the list of cgroup_settings sorted according to the following rules
* 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes
*/
static void sort_cgroup_settings(struct lxc_conf *conf)
{
LIST_HEAD(memsw_list);
struct lxc_cgroup *cgroup, *ncgroup;
/* Iterate over the cgroup settings and copy them to the output list. */
list_for_each_entry_safe(cgroup, ncgroup, &conf->cgroup, head) {
if (!strequal(cgroup->subsystem, "memory.memsw.limit_in_bytes"))
continue;
/* Move the memsw entry from the cgroup settings list. */
list_move_tail(&cgroup->head, &memsw_list);
}
/*
* Append all the memsw entries to the end of the cgroup settings list
* to make sure they are applied after all memory limit settings.
*/
list_splice_tail(&memsw_list, &conf->cgroup);
}
__cgfsng_ops static bool cgfsng_setup_limits_legacy(struct cgroup_ops *ops, __cgfsng_ops static bool cgfsng_setup_limits_legacy(struct cgroup_ops *ops,
struct lxc_conf *conf, struct lxc_conf *conf,
bool do_devices) bool do_devices)

23
src/lxc/conf.c
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@ -5679,29 +5679,6 @@ void suggest_default_idmap(void)
ERROR("lxc.idmap = g 0 %u %u", gid, grange); ERROR("lxc.idmap = g 0 %u %u", gid, grange);
} }
/* Return the list of cgroup_settings sorted according to the following rules
* 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes
*/
void sort_cgroup_settings(struct lxc_conf *conf)
{
struct lxc_cgroup *cgroup, *memsw_limit, *ncgroup;
/* Iterate over the cgroup settings and copy them to the output list. */
list_for_each_entry_safe(cgroup, ncgroup, &conf->cgroup, head) {
if (strequal(cgroup->subsystem, "memory.memsw.limit_in_bytes")) {
/* Store the memsw_limit location */
memsw_limit = cgroup;
} else if (memsw_limit && strequal(cgroup->subsystem, "memory.limit_in_bytes")) {
/*
* lxc.cgroup.memory.memsw.limit_in_bytes is found
* before lxc.cgroup.memory.limit_in_bytes, swap these
* two items.
*/
list_swap(&memsw_limit->head, &cgroup->head);
}
}
}
int lxc_set_environment(const struct lxc_conf *conf) int lxc_set_environment(const struct lxc_conf *conf)
{ {
struct environment_entry *env; struct environment_entry *env;

1
src/lxc/conf.h
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@ -568,7 +568,6 @@ __hidden extern int parse_mount_attrs(struct lxc_mount_options *opts, const char
__hidden extern void tmp_proc_unmount(struct lxc_conf *lxc_conf); __hidden extern void tmp_proc_unmount(struct lxc_conf *lxc_conf);
__hidden extern void suggest_default_idmap(void); __hidden extern void suggest_default_idmap(void);
__hidden extern FILE *make_anonymous_mount_file(struct lxc_list *mount, bool include_nesting_helpers); __hidden extern FILE *make_anonymous_mount_file(struct lxc_list *mount, bool include_nesting_helpers);
__hidden extern void sort_cgroup_settings(struct lxc_conf *conf);
__hidden extern int run_script(const char *name, const char *section, const char *script, ...); __hidden extern int run_script(const char *name, const char *section, const char *script, ...);
__hidden extern int run_script_argv(const char *name, unsigned int hook_version, const char *section, __hidden extern int run_script_argv(const char *name, unsigned int hook_version, const char *section,
const char *script, const char *hookname, char **argsin); const char *script, const char *hookname, char **argsin);