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core: always create /user and /machine top-level cgroup dirs

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This allows clients to put inotify watches on these trees to watch for
state changes, without having to wait until these dirs are created.

This introduces the new top-level /machine cgroup dir as canonical
location where OS containers and VMs shall be located (as discussed with
the libvirt folks).
This commit is contained in:
Lennart Poettering 2013-04-15 21:52:56 +02:00
parent a53824ea74
commit a32360f1a5
6 changed files with 39 additions and 37 deletions
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52
src/core/cgroup.c
View File

@ -40,7 +40,7 @@ int cgroup_bonding_realize(CGroupBonding *b) {
assert(b->path);
assert(b->controller);
r = cg_create(b->controller, b->path);
r = cg_create(b->controller, b->path, NULL);
if (r < 0) {
log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r));
return r;
@ -319,9 +319,9 @@ int cgroup_bonding_is_empty_list(CGroupBonding *first) {
}
int manager_setup_cgroup(Manager *m) {
char *current = NULL, *path = NULL;
_cleanup_free_ char *current = NULL, *path = NULL;
int r;
char suffix[32];
char suffix[sizeof("/systemd-") + DECIMAL_STR_MAX(pid_t)];
assert(m);
@ -335,7 +335,7 @@ int manager_setup_cgroup(Manager *m) {
r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &current);
if (r < 0) {
log_error("Cannot determine cgroup we are running in: %s", strerror(-r));
goto finish;
return r;
}
if (m->running_as == SYSTEMD_SYSTEM)
@ -354,35 +354,35 @@ int manager_setup_cgroup(Manager *m) {
} else {
/* We need a new root cgroup */
m->cgroup_hierarchy = NULL;
if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) {
r = log_oom();
goto finish;
}
if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0)
return log_oom();
}
/* 2. Show data */
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path);
if (r < 0) {
log_error("Cannot find cgroup mount point: %s", strerror(-r));
goto finish;
return r;
}
log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
/* 3. Install agent */
r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
if (r < 0)
log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
else if (r > 0)
log_debug("Installed release agent.");
else
log_debug("Release agent already installed.");
if (m->running_as == SYSTEMD_SYSTEM) {
r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
if (r < 0)
log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
else if (r > 0)
log_debug("Installed release agent.");
else
log_debug("Release agent already installed.");
}
/* 4. Realize the group */
r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0);
if (r < 0) {
log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
goto finish;
return r;
}
/* 5. And pin it, so that it cannot be unmounted */
@ -392,19 +392,21 @@ int manager_setup_cgroup(Manager *m) {
m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
if (r < 0) {
log_error("Failed to open pin file: %m");
r = -errno;
goto finish;
return -errno;
}
log_debug("Created root group.");
/* 6. Remove non-existing controllers from the default controllers list */
cg_shorten_controllers(m->default_controllers);
finish:
free(current);
free(path);
/* 7. Let's create the user and machine hierarchies
* right-away, so that people can inotify on them, if they
* wish, without this being racy. */
if (m->running_as == SYSTEMD_SYSTEM) {
cg_create(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, "../user");
cg_create(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, "../machine");
}
return r;
return 0;
}
void manager_shutdown_cgroup(Manager *m, bool delete) {

4
src/login/logind-session.c
View File

@ -442,9 +442,9 @@ static int session_create_one_group(Session *s, const char *controller, const ch
if (s->leader > 0) {
r = cg_create_and_attach(controller, path, s->leader);
if (r < 0)
r = cg_create(controller, path);
r = cg_create(controller, path, NULL);
} else
r = cg_create(controller, path);
r = cg_create(controller, path, NULL);
if (r < 0)
return r;

4
src/login/logind-user.c
View File

@ -320,7 +320,7 @@ static int user_create_cgroup(User *u) {
} else
p = u->cgroup_path;
r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p);
r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p, NULL);
if (r < 0) {
log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
free(p);
@ -335,7 +335,7 @@ static int user_create_cgroup(User *u) {
if (strv_contains(u->manager->reset_controllers, *k))
continue;
r = cg_create(*k, p);
r = cg_create(*k, p, NULL);
if (r < 0)
log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r));
}

6
src/shared/cgroup-label.c
View File

@ -36,14 +36,14 @@
#include "util.h"
#include "mkdir.h"
int cg_create(const char *controller, const char *path) {
int cg_create(const char *controller, const char *path, const char *suffix) {
_cleanup_free_ char *fs = NULL;
int r;
assert(controller);
assert(path);
r = cg_get_path_and_check(controller, path, NULL, &fs);
r = cg_get_path_and_check(controller, path, suffix, &fs);
if (r < 0)
return r;
@ -69,7 +69,7 @@ int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
assert(path);
assert(pid >= 0);
r = cg_create(controller, path);
r = cg_create(controller, path, NULL);
if (r < 0)
return r;

2
src/shared/cgroup-util.h
View File

@ -55,7 +55,7 @@ int cg_trim(const char *controller, const char *path, bool delete_root);
int cg_rmdir(const char *controller, const char *path, bool honour_sticky);
int cg_delete(const char *controller, const char *path);
int cg_create(const char *controller, const char *path);
int cg_create(const char *controller, const char *path, const char *suffix);
int cg_attach(const char *controller, const char *path, pid_t pid);
int cg_create_and_attach(const char *controller, const char *path, pid_t pid);

8
src/test/test-cgroup.c
View File

@ -31,10 +31,10 @@ int main(int argc, char*argv[]) {
char *path;
char *c, *p;
assert_se(cg_create(SYSTEMD_CGROUP_CONTROLLER, "/test-a") == 0);
assert_se(cg_create(SYSTEMD_CGROUP_CONTROLLER, "/test-a") == 0);
assert_se(cg_create(SYSTEMD_CGROUP_CONTROLLER, "/test-b") == 0);
assert_se(cg_create(SYSTEMD_CGROUP_CONTROLLER, "/test-b/test-c") == 0);
assert_se(cg_create(SYSTEMD_CGROUP_CONTROLLER, "/test-a", NULL) == 0);
assert_se(cg_create(SYSTEMD_CGROUP_CONTROLLER, "/test-a", NULL) == 0);
assert_se(cg_create(SYSTEMD_CGROUP_CONTROLLER, "/test-b", NULL) == 0);
assert_se(cg_create(SYSTEMD_CGROUP_CONTROLLER, "/test-b/test-c", NULL) == 0);
assert_se(cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, "/test-b", 0) == 0);
assert_se(cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, getpid(), &path) == 0);