1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/types.h>
27 #include <sys/mount.h>
31 #include "cgroup-util.h"
34 #include "path-util.h"
36 int cgroup_bonding_realize(CGroupBonding *b) {
41 assert(b->controller);
43 r = cg_create(b->controller, b->path);
45 log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r));
54 int cgroup_bonding_realize_list(CGroupBonding *first) {
58 LIST_FOREACH(by_unit, b, first)
59 if ((r = cgroup_bonding_realize(b)) < 0 && b->essential)
65 void cgroup_bonding_free(CGroupBonding *b, bool trim) {
71 LIST_REMOVE(CGroupBonding, by_unit, b->unit->cgroup_bondings, b);
73 if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
74 assert_se(f = hashmap_get(b->unit->manager->cgroup_bondings, b->path));
75 LIST_REMOVE(CGroupBonding, by_path, f, b);
78 hashmap_replace(b->unit->manager->cgroup_bondings, b->path, f);
80 hashmap_remove(b->unit->manager->cgroup_bondings, b->path);
84 if (b->realized && b->ours && trim)
85 cg_trim(b->controller, b->path, false);
92 void cgroup_bonding_free_list(CGroupBonding *first, bool remove_or_trim) {
95 LIST_FOREACH_SAFE(by_unit, b, n, first)
96 cgroup_bonding_free(b, remove_or_trim);
99 void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) {
102 if (b->realized && b->ours)
103 cg_trim(b->controller, b->path, delete_root);
106 void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) {
109 LIST_FOREACH(by_unit, b, first)
110 cgroup_bonding_trim(b, delete_root);
113 int cgroup_bonding_install(CGroupBonding *b, pid_t pid, const char *cgroup_suffix) {
114 _cleanup_free_ char *p = NULL;
122 p = strjoin(b->path, "/", cgroup_suffix, NULL);
130 r = cg_create_and_attach(b->controller, path, pid);
138 int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid, const char *cgroup_suffix) {
142 LIST_FOREACH(by_unit, b, first) {
143 r = cgroup_bonding_install(b, pid, cgroup_suffix);
144 if (r < 0 && b->essential)
151 int cgroup_bonding_migrate(CGroupBonding *b, CGroupBonding *list) {
155 LIST_FOREACH(by_unit, q, list) {
164 r = cg_migrate_recursive(q->controller, q->path, b->controller, b->path, true, false);
165 if (r < 0 && ret == 0)
172 int cgroup_bonding_migrate_to(CGroupBonding *b, const char *target, bool rem) {
176 return cg_migrate_recursive(b->controller, b->path, b->controller, target, true, rem);
179 int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) {
185 return cg_set_group_access(b->controller, b->path, mode, uid, gid);
188 int cgroup_bonding_set_group_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) {
192 LIST_FOREACH(by_unit, b, first) {
193 r = cgroup_bonding_set_group_access(b, mode, uid, gid);
201 int cgroup_bonding_set_task_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid, int sticky) {
207 return cg_set_task_access(b->controller, b->path, mode, uid, gid, sticky);
210 int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid, int sticky) {
214 LIST_FOREACH(by_unit, b, first) {
215 r = cgroup_bonding_set_task_access(b, mode, uid, gid, sticky);
223 int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) {
231 /* Don't kill cgroups that aren't ours */
236 p = strjoin(b->path, "/", cgroup_suffix, NULL);
244 r = cg_kill_recursive(b->controller, path, sig, sigcont, true, rem, s);
250 int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) {
252 Set *allocated_set = NULL;
253 int ret = -EAGAIN, r;
259 if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func)))
262 LIST_FOREACH(by_unit, b, first) {
263 r = cgroup_bonding_kill(b, sig, sigcont, rem, s, cgroup_suffix);
265 if (r == -EAGAIN || r == -ESRCH)
272 if (ret < 0 || r > 0)
278 set_free(allocated_set);
283 /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we
285 int cgroup_bonding_is_empty(CGroupBonding *b) {
290 if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0)
293 /* If it is empty it is empty */
297 /* It's not only us using this cgroup, so we just don't know */
298 return b->ours ? 0 : -EAGAIN;
301 int cgroup_bonding_is_empty_list(CGroupBonding *first) {
304 LIST_FOREACH(by_unit, b, first) {
307 if ((r = cgroup_bonding_is_empty(b)) < 0) {
308 /* If this returned -EAGAIN, then we don't know if the
309 * group is empty, so let's see if another group can
321 int manager_setup_cgroup(Manager *m) {
322 char *current = NULL, *path = NULL;
328 /* 0. Be nice to Ingo Molnar #628004 */
329 if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) {
330 log_warning("No control group support available, not creating root group.");
334 /* 1. Determine hierarchy */
335 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t);
337 log_error("Cannot determine cgroup we are running in: %s", strerror(-r));
341 if (m->running_as == SYSTEMD_SYSTEM)
342 strcpy(suffix, "/system");
344 snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid());
345 char_array_0(suffix);
348 free(m->cgroup_hierarchy);
349 if (endswith(current, suffix)) {
350 /* We probably got reexecuted and can continue to use our root cgroup */
351 m->cgroup_hierarchy = current;
355 /* We need a new root cgroup */
356 m->cgroup_hierarchy = NULL;
357 if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) {
364 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path);
366 log_error("Cannot find cgroup mount point: %s", strerror(-r));
370 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
372 /* 3. Install agent */
373 r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
375 log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
377 log_debug("Installed release agent.");
379 log_debug("Release agent already installed.");
381 /* 4. Realize the group */
382 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0);
384 log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
388 /* 5. And pin it, so that it cannot be unmounted */
389 if (m->pin_cgroupfs_fd >= 0)
390 close_nointr_nofail(m->pin_cgroupfs_fd);
392 m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
394 log_error("Failed to open pin file: %m");
399 log_debug("Created root group.");
401 cg_shorten_controllers(m->default_controllers);
410 void manager_shutdown_cgroup(Manager *m, bool delete) {
413 if (delete && m->cgroup_hierarchy)
414 cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy);
416 if (m->pin_cgroupfs_fd >= 0) {
417 close_nointr_nofail(m->pin_cgroupfs_fd);
418 m->pin_cgroupfs_fd = -1;
421 free(m->cgroup_hierarchy);
422 m->cgroup_hierarchy = NULL;
425 int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) {
433 b = hashmap_get(m->cgroup_bondings, cgroup);
454 b = hashmap_get(m->cgroup_bondings, p);
462 int cgroup_notify_empty(Manager *m, const char *group) {
463 CGroupBonding *l, *b;
469 r = cgroup_bonding_get(m, group, &l);
473 LIST_FOREACH(by_path, b, l) {
479 t = cgroup_bonding_is_empty_list(b);
482 /* If we don't know, we don't know */
484 log_warning("Failed to check whether cgroup is empty: %s", strerror(errno));
490 /* If it is empty, let's delete it */
491 cgroup_bonding_trim_list(b->unit->cgroup_bondings, true);
493 if (UNIT_VTABLE(b->unit)->cgroup_notify_empty)
494 UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit);
501 Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) {
502 CGroupBonding *l, *b;
510 if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0)
513 l = hashmap_get(m->cgroup_bondings, group);
518 while ((slash = strrchr(group, '/'))) {
524 if ((l = hashmap_get(m->cgroup_bondings, group)))
531 LIST_FOREACH(by_path, b, l) {
543 CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) {
547 controller = SYSTEMD_CGROUP_CONTROLLER;
549 LIST_FOREACH(by_unit, b, first)
550 if (streq(b->controller, controller))
556 char *cgroup_bonding_to_string(CGroupBonding *b) {
561 if (asprintf(&r, "%s:%s", b->controller, b->path) < 0)
567 pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) {
569 pid_t pid = 0, npid, mypid;
576 if (cg_enumerate_processes(b->controller, b->path, &f) < 0)
581 while (cg_read_pid(f, &npid) > 0) {
587 /* Ignore processes that aren't our kids */
588 if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid)
592 /* Dang, there's more than one daemonized PID
593 in this group, so we don't know what process
594 is the main process. */
607 pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) {
611 /* Try to find a main pid from this cgroup, but checking if
612 * there's only one PID in the cgroup and returning it. Later
613 * on we might want to add additional, smarter heuristics
616 LIST_FOREACH(by_unit, b, first)
617 if ((pid = cgroup_bonding_search_main_pid(b)) != 0)