2782 lines
75 KiB
C
2782 lines
75 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2010 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <ftw.h>
|
|
#include <limits.h>
|
|
#include <signal.h>
|
|
#include <stddef.h>
|
|
#include <stdio_ext.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/statfs.h>
|
|
#include <sys/types.h>
|
|
#include <sys/xattr.h>
|
|
#include <unistd.h>
|
|
|
|
#include "alloc-util.h"
|
|
#include "cgroup-util.h"
|
|
#include "def.h"
|
|
#include "dirent-util.h"
|
|
#include "extract-word.h"
|
|
#include "fd-util.h"
|
|
#include "fileio.h"
|
|
#include "format-util.h"
|
|
#include "fs-util.h"
|
|
#include "log.h"
|
|
#include "login-util.h"
|
|
#include "macro.h"
|
|
#include "missing.h"
|
|
#include "mkdir.h"
|
|
#include "parse-util.h"
|
|
#include "path-util.h"
|
|
#include "proc-cmdline.h"
|
|
#include "process-util.h"
|
|
#include "set.h"
|
|
#include "special.h"
|
|
#include "stat-util.h"
|
|
#include "stdio-util.h"
|
|
#include "string-table.h"
|
|
#include "string-util.h"
|
|
#include "strv.h"
|
|
#include "unit-name.h"
|
|
#include "user-util.h"
|
|
|
|
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
FILE *f;
|
|
int r;
|
|
|
|
assert(_f);
|
|
|
|
r = cg_get_path(controller, path, "cgroup.procs", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
f = fopen(fs, "re");
|
|
if (!f)
|
|
return -errno;
|
|
|
|
*_f = f;
|
|
return 0;
|
|
}
|
|
|
|
int cg_read_pid(FILE *f, pid_t *_pid) {
|
|
unsigned long ul;
|
|
|
|
/* Note that the cgroup.procs might contain duplicates! See
|
|
* cgroups.txt for details. */
|
|
|
|
assert(f);
|
|
assert(_pid);
|
|
|
|
errno = 0;
|
|
if (fscanf(f, "%lu", &ul) != 1) {
|
|
|
|
if (feof(f))
|
|
return 0;
|
|
|
|
return errno > 0 ? -errno : -EIO;
|
|
}
|
|
|
|
if (ul <= 0)
|
|
return -EIO;
|
|
|
|
*_pid = (pid_t) ul;
|
|
return 1;
|
|
}
|
|
|
|
int cg_read_event(
|
|
const char *controller,
|
|
const char *path,
|
|
const char *event,
|
|
char **val) {
|
|
|
|
_cleanup_free_ char *events = NULL, *content = NULL;
|
|
char *p, *line;
|
|
int r;
|
|
|
|
r = cg_get_path(controller, path, "cgroup.events", &events);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = read_full_file(events, &content, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
p = content;
|
|
while ((line = strsep(&p, "\n"))) {
|
|
char *key;
|
|
|
|
key = strsep(&line, " ");
|
|
if (!key || !line)
|
|
return -EINVAL;
|
|
|
|
if (strcmp(key, event))
|
|
continue;
|
|
|
|
*val = strdup(line);
|
|
return 0;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
bool cg_ns_supported(void) {
|
|
static thread_local int enabled = -1;
|
|
|
|
if (enabled >= 0)
|
|
return enabled;
|
|
|
|
if (access("/proc/self/ns/cgroup", F_OK) == 0)
|
|
enabled = 1;
|
|
else
|
|
enabled = 0;
|
|
|
|
return enabled;
|
|
}
|
|
|
|
int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
int r;
|
|
DIR *d;
|
|
|
|
assert(_d);
|
|
|
|
/* This is not recursive! */
|
|
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
d = opendir(fs);
|
|
if (!d)
|
|
return -errno;
|
|
|
|
*_d = d;
|
|
return 0;
|
|
}
|
|
|
|
int cg_read_subgroup(DIR *d, char **fn) {
|
|
struct dirent *de;
|
|
|
|
assert(d);
|
|
assert(fn);
|
|
|
|
FOREACH_DIRENT_ALL(de, d, return -errno) {
|
|
char *b;
|
|
|
|
if (de->d_type != DT_DIR)
|
|
continue;
|
|
|
|
if (dot_or_dot_dot(de->d_name))
|
|
continue;
|
|
|
|
b = strdup(de->d_name);
|
|
if (!b)
|
|
return -ENOMEM;
|
|
|
|
*fn = b;
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_rmdir(const char *controller, const char *path) {
|
|
_cleanup_free_ char *p = NULL;
|
|
int r;
|
|
|
|
r = cg_get_path(controller, path, NULL, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = rmdir(p);
|
|
if (r < 0 && errno != ENOENT)
|
|
return -errno;
|
|
|
|
r = cg_hybrid_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
|
|
r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to remove compat systemd cgroup %s: %m", path);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_kill(
|
|
const char *controller,
|
|
const char *path,
|
|
int sig,
|
|
CGroupFlags flags,
|
|
Set *s,
|
|
cg_kill_log_func_t log_kill,
|
|
void *userdata) {
|
|
|
|
_cleanup_set_free_ Set *allocated_set = NULL;
|
|
bool done = false;
|
|
int r, ret = 0;
|
|
pid_t my_pid;
|
|
|
|
assert(sig >= 0);
|
|
|
|
/* Don't send SIGCONT twice. Also, SIGKILL always works even when process is suspended, hence don't send
|
|
* SIGCONT on SIGKILL. */
|
|
if (IN_SET(sig, SIGCONT, SIGKILL))
|
|
flags &= ~CGROUP_SIGCONT;
|
|
|
|
/* This goes through the tasks list and kills them all. This
|
|
* is repeated until no further processes are added to the
|
|
* tasks list, to properly handle forking processes */
|
|
|
|
if (!s) {
|
|
s = allocated_set = set_new(NULL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
my_pid = getpid_cached();
|
|
|
|
do {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
pid_t pid = 0;
|
|
done = true;
|
|
|
|
r = cg_enumerate_processes(controller, path, &f);
|
|
if (r < 0) {
|
|
if (ret >= 0 && r != -ENOENT)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
|
|
while ((r = cg_read_pid(f, &pid)) > 0) {
|
|
|
|
if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid)
|
|
continue;
|
|
|
|
if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid))
|
|
continue;
|
|
|
|
if (log_kill)
|
|
log_kill(pid, sig, userdata);
|
|
|
|
/* If we haven't killed this process yet, kill
|
|
* it */
|
|
if (kill(pid, sig) < 0) {
|
|
if (ret >= 0 && errno != ESRCH)
|
|
ret = -errno;
|
|
} else {
|
|
if (flags & CGROUP_SIGCONT)
|
|
(void) kill(pid, SIGCONT);
|
|
|
|
if (ret == 0)
|
|
ret = 1;
|
|
}
|
|
|
|
done = false;
|
|
|
|
r = set_put(s, PID_TO_PTR(pid));
|
|
if (r < 0) {
|
|
if (ret >= 0)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (r < 0) {
|
|
if (ret >= 0)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* To avoid racing against processes which fork
|
|
* quicker than we can kill them we repeat this until
|
|
* no new pids need to be killed. */
|
|
|
|
} while (!done);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int cg_kill_recursive(
|
|
const char *controller,
|
|
const char *path,
|
|
int sig,
|
|
CGroupFlags flags,
|
|
Set *s,
|
|
cg_kill_log_func_t log_kill,
|
|
void *userdata) {
|
|
|
|
_cleanup_set_free_ Set *allocated_set = NULL;
|
|
_cleanup_closedir_ DIR *d = NULL;
|
|
int r, ret;
|
|
char *fn;
|
|
|
|
assert(path);
|
|
assert(sig >= 0);
|
|
|
|
if (!s) {
|
|
s = allocated_set = set_new(NULL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = cg_kill(controller, path, sig, flags, s, log_kill, userdata);
|
|
|
|
r = cg_enumerate_subgroups(controller, path, &d);
|
|
if (r < 0) {
|
|
if (ret >= 0 && r != -ENOENT)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
|
|
while ((r = cg_read_subgroup(d, &fn)) > 0) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = strjoin(path, "/", fn);
|
|
free(fn);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = cg_kill_recursive(controller, p, sig, flags, s, log_kill, userdata);
|
|
if (r != 0 && ret >= 0)
|
|
ret = r;
|
|
}
|
|
if (ret >= 0 && r < 0)
|
|
ret = r;
|
|
|
|
if (flags & CGROUP_REMOVE) {
|
|
r = cg_rmdir(controller, path);
|
|
if (r < 0 && ret >= 0 && !IN_SET(r, -ENOENT, -EBUSY))
|
|
return r;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int cg_migrate(
|
|
const char *cfrom,
|
|
const char *pfrom,
|
|
const char *cto,
|
|
const char *pto,
|
|
CGroupFlags flags) {
|
|
|
|
bool done = false;
|
|
_cleanup_set_free_ Set *s = NULL;
|
|
int r, ret = 0;
|
|
pid_t my_pid;
|
|
|
|
assert(cfrom);
|
|
assert(pfrom);
|
|
assert(cto);
|
|
assert(pto);
|
|
|
|
s = set_new(NULL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
my_pid = getpid_cached();
|
|
|
|
do {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
pid_t pid = 0;
|
|
done = true;
|
|
|
|
r = cg_enumerate_processes(cfrom, pfrom, &f);
|
|
if (r < 0) {
|
|
if (ret >= 0 && r != -ENOENT)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
|
|
while ((r = cg_read_pid(f, &pid)) > 0) {
|
|
|
|
/* This might do weird stuff if we aren't a
|
|
* single-threaded program. However, we
|
|
* luckily know we are not */
|
|
if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid)
|
|
continue;
|
|
|
|
if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid))
|
|
continue;
|
|
|
|
/* Ignore kernel threads. Since they can only
|
|
* exist in the root cgroup, we only check for
|
|
* them there. */
|
|
if (cfrom &&
|
|
(isempty(pfrom) || path_equal(pfrom, "/")) &&
|
|
is_kernel_thread(pid) > 0)
|
|
continue;
|
|
|
|
r = cg_attach(cto, pto, pid);
|
|
if (r < 0) {
|
|
if (ret >= 0 && r != -ESRCH)
|
|
ret = r;
|
|
} else if (ret == 0)
|
|
ret = 1;
|
|
|
|
done = false;
|
|
|
|
r = set_put(s, PID_TO_PTR(pid));
|
|
if (r < 0) {
|
|
if (ret >= 0)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (r < 0) {
|
|
if (ret >= 0)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
} while (!done);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int cg_migrate_recursive(
|
|
const char *cfrom,
|
|
const char *pfrom,
|
|
const char *cto,
|
|
const char *pto,
|
|
CGroupFlags flags) {
|
|
|
|
_cleanup_closedir_ DIR *d = NULL;
|
|
int r, ret = 0;
|
|
char *fn;
|
|
|
|
assert(cfrom);
|
|
assert(pfrom);
|
|
assert(cto);
|
|
assert(pto);
|
|
|
|
ret = cg_migrate(cfrom, pfrom, cto, pto, flags);
|
|
|
|
r = cg_enumerate_subgroups(cfrom, pfrom, &d);
|
|
if (r < 0) {
|
|
if (ret >= 0 && r != -ENOENT)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
|
|
while ((r = cg_read_subgroup(d, &fn)) > 0) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = strjoin(pfrom, "/", fn);
|
|
free(fn);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = cg_migrate_recursive(cfrom, p, cto, pto, flags);
|
|
if (r != 0 && ret >= 0)
|
|
ret = r;
|
|
}
|
|
|
|
if (r < 0 && ret >= 0)
|
|
ret = r;
|
|
|
|
if (flags & CGROUP_REMOVE) {
|
|
r = cg_rmdir(cfrom, pfrom);
|
|
if (r < 0 && ret >= 0 && !IN_SET(r, -ENOENT, -EBUSY))
|
|
return r;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int cg_migrate_recursive_fallback(
|
|
const char *cfrom,
|
|
const char *pfrom,
|
|
const char *cto,
|
|
const char *pto,
|
|
CGroupFlags flags) {
|
|
|
|
int r;
|
|
|
|
assert(cfrom);
|
|
assert(pfrom);
|
|
assert(cto);
|
|
assert(pto);
|
|
|
|
r = cg_migrate_recursive(cfrom, pfrom, cto, pto, flags);
|
|
if (r < 0) {
|
|
char prefix[strlen(pto) + 1];
|
|
|
|
/* This didn't work? Then let's try all prefixes of the destination */
|
|
|
|
PATH_FOREACH_PREFIX(prefix, pto) {
|
|
int q;
|
|
|
|
q = cg_migrate_recursive(cfrom, pfrom, cto, prefix, flags);
|
|
if (q >= 0)
|
|
return q;
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static const char *controller_to_dirname(const char *controller) {
|
|
const char *e;
|
|
|
|
assert(controller);
|
|
|
|
/* Converts a controller name to the directory name below
|
|
* /sys/fs/cgroup/ we want to mount it to. Effectively, this
|
|
* just cuts off the name= prefixed used for named
|
|
* hierarchies, if it is specified. */
|
|
|
|
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
|
|
if (cg_hybrid_unified() > 0)
|
|
controller = SYSTEMD_CGROUP_CONTROLLER_HYBRID;
|
|
else
|
|
controller = SYSTEMD_CGROUP_CONTROLLER_LEGACY;
|
|
}
|
|
|
|
e = startswith(controller, "name=");
|
|
if (e)
|
|
return e;
|
|
|
|
return controller;
|
|
}
|
|
|
|
static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) {
|
|
const char *dn;
|
|
char *t = NULL;
|
|
|
|
assert(fs);
|
|
assert(controller);
|
|
|
|
dn = controller_to_dirname(controller);
|
|
|
|
if (isempty(path) && isempty(suffix))
|
|
t = strappend("/sys/fs/cgroup/", dn);
|
|
else if (isempty(path))
|
|
t = strjoin("/sys/fs/cgroup/", dn, "/", suffix);
|
|
else if (isempty(suffix))
|
|
t = strjoin("/sys/fs/cgroup/", dn, "/", path);
|
|
else
|
|
t = strjoin("/sys/fs/cgroup/", dn, "/", path, "/", suffix);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
*fs = t;
|
|
return 0;
|
|
}
|
|
|
|
static int join_path_unified(const char *path, const char *suffix, char **fs) {
|
|
char *t;
|
|
|
|
assert(fs);
|
|
|
|
if (isempty(path) && isempty(suffix))
|
|
t = strdup("/sys/fs/cgroup");
|
|
else if (isempty(path))
|
|
t = strappend("/sys/fs/cgroup/", suffix);
|
|
else if (isempty(suffix))
|
|
t = strappend("/sys/fs/cgroup/", path);
|
|
else
|
|
t = strjoin("/sys/fs/cgroup/", path, "/", suffix);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
*fs = t;
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
|
|
int r;
|
|
|
|
assert(fs);
|
|
|
|
if (!controller) {
|
|
char *t;
|
|
|
|
/* If no controller is specified, we return the path
|
|
* *below* the controllers, without any prefix. */
|
|
|
|
if (!path && !suffix)
|
|
return -EINVAL;
|
|
|
|
if (!suffix)
|
|
t = strdup(path);
|
|
else if (!path)
|
|
t = strdup(suffix);
|
|
else
|
|
t = strjoin(path, "/", suffix);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
*fs = path_kill_slashes(t);
|
|
return 0;
|
|
}
|
|
|
|
if (!cg_controller_is_valid(controller))
|
|
return -EINVAL;
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0)
|
|
r = join_path_unified(path, suffix, fs);
|
|
else
|
|
r = join_path_legacy(controller, path, suffix, fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
path_kill_slashes(*fs);
|
|
return 0;
|
|
}
|
|
|
|
static int controller_is_accessible(const char *controller) {
|
|
int r;
|
|
|
|
assert(controller);
|
|
|
|
/* Checks whether a specific controller is accessible,
|
|
* i.e. its hierarchy mounted. In the unified hierarchy all
|
|
* controllers are considered accessible, except for the named
|
|
* hierarchies */
|
|
|
|
if (!cg_controller_is_valid(controller))
|
|
return -EINVAL;
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) {
|
|
/* We don't support named hierarchies if we are using
|
|
* the unified hierarchy. */
|
|
|
|
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
|
|
return 0;
|
|
|
|
if (startswith(controller, "name="))
|
|
return -EOPNOTSUPP;
|
|
|
|
} else {
|
|
const char *cc, *dn;
|
|
|
|
dn = controller_to_dirname(controller);
|
|
cc = strjoina("/sys/fs/cgroup/", dn);
|
|
|
|
if (laccess(cc, F_OK) < 0)
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
|
|
int r;
|
|
|
|
assert(controller);
|
|
assert(fs);
|
|
|
|
/* Check if the specified controller is actually accessible */
|
|
r = controller_is_accessible(controller);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_get_path(controller, path, suffix, fs);
|
|
}
|
|
|
|
static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
|
|
assert(path);
|
|
assert(sb);
|
|
assert(ftwbuf);
|
|
|
|
if (typeflag != FTW_DP)
|
|
return 0;
|
|
|
|
if (ftwbuf->level < 1)
|
|
return 0;
|
|
|
|
(void) rmdir(path);
|
|
return 0;
|
|
}
|
|
|
|
int cg_trim(const char *controller, const char *path, bool delete_root) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
int r = 0, q;
|
|
|
|
assert(path);
|
|
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
errno = 0;
|
|
if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) {
|
|
if (errno == ENOENT)
|
|
r = 0;
|
|
else if (errno > 0)
|
|
r = -errno;
|
|
else
|
|
r = -EIO;
|
|
}
|
|
|
|
if (delete_root) {
|
|
if (rmdir(fs) < 0 && errno != ENOENT)
|
|
return -errno;
|
|
}
|
|
|
|
q = cg_hybrid_unified();
|
|
if (q < 0)
|
|
return q;
|
|
if (q > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
|
|
q = cg_trim(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, delete_root);
|
|
if (q < 0)
|
|
log_warning_errno(q, "Failed to trim compat systemd cgroup %s: %m", path);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_create(const char *controller, const char *path) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
int r;
|
|
|
|
r = cg_get_path_and_check(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = mkdir_parents(fs, 0755);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = mkdir_errno_wrapper(fs, 0755);
|
|
if (r == -EEXIST)
|
|
return 0;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_hybrid_unified();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
|
|
r = cg_create(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to create compat systemd cgroup %s: %m", path);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
|
|
int r, q;
|
|
|
|
assert(pid >= 0);
|
|
|
|
r = cg_create(controller, path);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
q = cg_attach(controller, path, pid);
|
|
if (q < 0)
|
|
return q;
|
|
|
|
/* This does not remove the cgroup on failure */
|
|
return r;
|
|
}
|
|
|
|
int cg_attach(const char *controller, const char *path, pid_t pid) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
char c[DECIMAL_STR_MAX(pid_t) + 2];
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(pid >= 0);
|
|
|
|
r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (pid == 0)
|
|
pid = getpid_cached();
|
|
|
|
xsprintf(c, PID_FMT "\n", pid);
|
|
|
|
r = write_string_file(fs, c, 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_hybrid_unified();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
|
|
r = cg_attach(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, pid);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to attach "PID_FMT" to compat systemd cgroup %s: %m", pid, path);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
|
|
int r;
|
|
|
|
assert(controller);
|
|
assert(path);
|
|
assert(pid >= 0);
|
|
|
|
r = cg_attach(controller, path, pid);
|
|
if (r < 0) {
|
|
char prefix[strlen(path) + 1];
|
|
|
|
/* This didn't work? Then let's try all prefixes of
|
|
* the destination */
|
|
|
|
PATH_FOREACH_PREFIX(prefix, path) {
|
|
int q;
|
|
|
|
q = cg_attach(controller, prefix, pid);
|
|
if (q >= 0)
|
|
return q;
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_set_access(
|
|
const char *controller,
|
|
const char *path,
|
|
uid_t uid,
|
|
gid_t gid) {
|
|
|
|
struct Attribute {
|
|
const char *name;
|
|
bool fatal;
|
|
};
|
|
|
|
/* cgroupsv1, aka legacy/non-unified */
|
|
static const struct Attribute legacy_attributes[] = {
|
|
{ "cgroup.procs", true },
|
|
{ "tasks", false },
|
|
{ "cgroup.clone_children", false },
|
|
{},
|
|
};
|
|
|
|
/* cgroupsv2, aka unified */
|
|
static const struct Attribute unified_attributes[] = {
|
|
{ "cgroup.procs", true },
|
|
{ "cgroup.subtree_control", true },
|
|
{ "cgroup.threads", false },
|
|
{},
|
|
};
|
|
|
|
static const struct Attribute* const attributes[] = {
|
|
[false] = legacy_attributes,
|
|
[true] = unified_attributes,
|
|
};
|
|
|
|
_cleanup_free_ char *fs = NULL;
|
|
const struct Attribute *i;
|
|
int r, unified;
|
|
|
|
assert(path);
|
|
|
|
if (uid == UID_INVALID && gid == GID_INVALID)
|
|
return 0;
|
|
|
|
unified = cg_unified_controller(controller);
|
|
if (unified < 0)
|
|
return unified;
|
|
|
|
/* Configure access to the cgroup itself */
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = chmod_and_chown(fs, 0755, uid, gid);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Configure access to the cgroup's attributes */
|
|
for (i = attributes[unified]; i->name; i++) {
|
|
fs = mfree(fs);
|
|
|
|
r = cg_get_path(controller, path, i->name, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = chmod_and_chown(fs, 0644, uid, gid);
|
|
if (r < 0) {
|
|
if (i->fatal)
|
|
return r;
|
|
|
|
log_debug_errno(r, "Failed to set access on cgroup %s, ignoring: %m", fs);
|
|
}
|
|
}
|
|
|
|
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
|
|
r = cg_hybrid_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) {
|
|
/* Always propagate access mode from unified to legacy controller */
|
|
r = cg_set_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, uid, gid);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to set access on compatibility systemd cgroup %s, ignoring: %m", path);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(name);
|
|
assert(value || size <= 0);
|
|
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (setxattr(fs, name, value, size, flags) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_xattr(const char *controller, const char *path, const char *name, void *value, size_t size) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
ssize_t n;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(name);
|
|
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
n = getxattr(fs, name, value, size);
|
|
if (n < 0)
|
|
return -errno;
|
|
|
|
return (int) n;
|
|
}
|
|
|
|
int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
char line[LINE_MAX];
|
|
const char *fs, *controller_str;
|
|
size_t cs = 0;
|
|
int unified;
|
|
|
|
assert(path);
|
|
assert(pid >= 0);
|
|
|
|
if (controller) {
|
|
if (!cg_controller_is_valid(controller))
|
|
return -EINVAL;
|
|
} else
|
|
controller = SYSTEMD_CGROUP_CONTROLLER;
|
|
|
|
unified = cg_unified_controller(controller);
|
|
if (unified < 0)
|
|
return unified;
|
|
if (unified == 0) {
|
|
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
|
|
controller_str = SYSTEMD_CGROUP_CONTROLLER_LEGACY;
|
|
else
|
|
controller_str = controller;
|
|
|
|
cs = strlen(controller_str);
|
|
}
|
|
|
|
fs = procfs_file_alloca(pid, "cgroup");
|
|
f = fopen(fs, "re");
|
|
if (!f)
|
|
return errno == ENOENT ? -ESRCH : -errno;
|
|
|
|
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
|
|
|
FOREACH_LINE(line, f, return -errno) {
|
|
char *e, *p;
|
|
|
|
truncate_nl(line);
|
|
|
|
if (unified) {
|
|
e = startswith(line, "0:");
|
|
if (!e)
|
|
continue;
|
|
|
|
e = strchr(e, ':');
|
|
if (!e)
|
|
continue;
|
|
} else {
|
|
char *l;
|
|
size_t k;
|
|
const char *word, *state;
|
|
bool found = false;
|
|
|
|
l = strchr(line, ':');
|
|
if (!l)
|
|
continue;
|
|
|
|
l++;
|
|
e = strchr(l, ':');
|
|
if (!e)
|
|
continue;
|
|
|
|
*e = 0;
|
|
FOREACH_WORD_SEPARATOR(word, k, l, ",", state)
|
|
if (k == cs && memcmp(word, controller_str, cs) == 0) {
|
|
found = true;
|
|
break;
|
|
}
|
|
if (!found)
|
|
continue;
|
|
}
|
|
|
|
p = strdup(e + 1);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
/* Truncate suffix indicating the process is a zombie */
|
|
e = endswith(p, " (deleted)");
|
|
if (e)
|
|
*e = 0;
|
|
|
|
*path = p;
|
|
return 0;
|
|
}
|
|
|
|
return -ENODATA;
|
|
}
|
|
|
|
int cg_install_release_agent(const char *controller, const char *agent) {
|
|
_cleanup_free_ char *fs = NULL, *contents = NULL;
|
|
const char *sc;
|
|
int r;
|
|
|
|
assert(agent);
|
|
|
|
r = cg_unified_controller(controller);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) /* doesn't apply to unified hierarchy */
|
|
return -EOPNOTSUPP;
|
|
|
|
r = cg_get_path(controller, NULL, "release_agent", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = read_one_line_file(fs, &contents);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
sc = strstrip(contents);
|
|
if (isempty(sc)) {
|
|
r = write_string_file(fs, agent, 0);
|
|
if (r < 0)
|
|
return r;
|
|
} else if (!path_equal(sc, agent))
|
|
return -EEXIST;
|
|
|
|
fs = mfree(fs);
|
|
r = cg_get_path(controller, NULL, "notify_on_release", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
contents = mfree(contents);
|
|
r = read_one_line_file(fs, &contents);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
sc = strstrip(contents);
|
|
if (streq(sc, "0")) {
|
|
r = write_string_file(fs, "1", 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
if (!streq(sc, "1"))
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_uninstall_release_agent(const char *controller) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
int r;
|
|
|
|
r = cg_unified_controller(controller);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) /* Doesn't apply to unified hierarchy */
|
|
return -EOPNOTSUPP;
|
|
|
|
r = cg_get_path(controller, NULL, "notify_on_release", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = write_string_file(fs, "0", 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
fs = mfree(fs);
|
|
|
|
r = cg_get_path(controller, NULL, "release_agent", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = write_string_file(fs, "", 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_is_empty(const char *controller, const char *path) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
pid_t pid;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = cg_enumerate_processes(controller, path, &f);
|
|
if (r == -ENOENT)
|
|
return 1;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_read_pid(f, &pid);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return r == 0;
|
|
}
|
|
|
|
int cg_is_empty_recursive(const char *controller, const char *path) {
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
/* The root cgroup is always populated */
|
|
if (controller && (isempty(path) || path_equal(path, "/")))
|
|
return false;
|
|
|
|
r = cg_unified_controller(controller);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) {
|
|
_cleanup_free_ char *t = NULL;
|
|
|
|
/* On the unified hierarchy we can check empty state
|
|
* via the "populated" attribute of "cgroup.events". */
|
|
|
|
r = cg_read_event(controller, path, "populated", &t);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return streq(t, "0");
|
|
} else {
|
|
_cleanup_closedir_ DIR *d = NULL;
|
|
char *fn;
|
|
|
|
r = cg_is_empty(controller, path);
|
|
if (r <= 0)
|
|
return r;
|
|
|
|
r = cg_enumerate_subgroups(controller, path, &d);
|
|
if (r == -ENOENT)
|
|
return 1;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
while ((r = cg_read_subgroup(d, &fn)) > 0) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = strjoin(path, "/", fn);
|
|
free(fn);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = cg_is_empty_recursive(controller, p);
|
|
if (r <= 0)
|
|
return r;
|
|
}
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
int cg_split_spec(const char *spec, char **controller, char **path) {
|
|
char *t = NULL, *u = NULL;
|
|
const char *e;
|
|
|
|
assert(spec);
|
|
|
|
if (*spec == '/') {
|
|
if (!path_is_normalized(spec))
|
|
return -EINVAL;
|
|
|
|
if (path) {
|
|
t = strdup(spec);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
*path = path_kill_slashes(t);
|
|
}
|
|
|
|
if (controller)
|
|
*controller = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
e = strchr(spec, ':');
|
|
if (!e) {
|
|
if (!cg_controller_is_valid(spec))
|
|
return -EINVAL;
|
|
|
|
if (controller) {
|
|
t = strdup(spec);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
*controller = t;
|
|
}
|
|
|
|
if (path)
|
|
*path = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
t = strndup(spec, e-spec);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
if (!cg_controller_is_valid(t)) {
|
|
free(t);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (isempty(e+1))
|
|
u = NULL;
|
|
else {
|
|
u = strdup(e+1);
|
|
if (!u) {
|
|
free(t);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (!path_is_normalized(u) ||
|
|
!path_is_absolute(u)) {
|
|
free(t);
|
|
free(u);
|
|
return -EINVAL;
|
|
}
|
|
|
|
path_kill_slashes(u);
|
|
}
|
|
|
|
if (controller)
|
|
*controller = t;
|
|
else
|
|
free(t);
|
|
|
|
if (path)
|
|
*path = u;
|
|
else
|
|
free(u);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_mangle_path(const char *path, char **result) {
|
|
_cleanup_free_ char *c = NULL, *p = NULL;
|
|
char *t;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(result);
|
|
|
|
/* First, check if it already is a filesystem path */
|
|
if (path_startswith(path, "/sys/fs/cgroup")) {
|
|
|
|
t = strdup(path);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
*result = path_kill_slashes(t);
|
|
return 0;
|
|
}
|
|
|
|
/* Otherwise, treat it as cg spec */
|
|
r = cg_split_spec(path, &c, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result);
|
|
}
|
|
|
|
int cg_get_root_path(char **path) {
|
|
char *p, *e;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
e = endswith(p, "/" SPECIAL_INIT_SCOPE);
|
|
if (!e)
|
|
e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */
|
|
if (!e)
|
|
e = endswith(p, "/system"); /* even more legacy */
|
|
if (e)
|
|
*e = 0;
|
|
|
|
*path = p;
|
|
return 0;
|
|
}
|
|
|
|
int cg_shift_path(const char *cgroup, const char *root, const char **shifted) {
|
|
_cleanup_free_ char *rt = NULL;
|
|
char *p;
|
|
int r;
|
|
|
|
assert(cgroup);
|
|
assert(shifted);
|
|
|
|
if (!root) {
|
|
/* If the root was specified let's use that, otherwise
|
|
* let's determine it from PID 1 */
|
|
|
|
r = cg_get_root_path(&rt);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
root = rt;
|
|
}
|
|
|
|
p = path_startswith(cgroup, root);
|
|
if (p && p > cgroup)
|
|
*shifted = p - 1;
|
|
else
|
|
*shifted = cgroup;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
|
|
_cleanup_free_ char *raw = NULL;
|
|
const char *c;
|
|
int r;
|
|
|
|
assert(pid >= 0);
|
|
assert(cgroup);
|
|
|
|
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_shift_path(raw, root, &c);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (c == raw)
|
|
*cgroup = TAKE_PTR(raw);
|
|
else {
|
|
char *n;
|
|
|
|
n = strdup(c);
|
|
if (!n)
|
|
return -ENOMEM;
|
|
|
|
*cgroup = n;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_path_decode_unit(const char *cgroup, char **unit) {
|
|
char *c, *s;
|
|
size_t n;
|
|
|
|
assert(cgroup);
|
|
assert(unit);
|
|
|
|
n = strcspn(cgroup, "/");
|
|
if (n < 3)
|
|
return -ENXIO;
|
|
|
|
c = strndupa(cgroup, n);
|
|
c = cg_unescape(c);
|
|
|
|
if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
|
|
return -ENXIO;
|
|
|
|
s = strdup(c);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*unit = s;
|
|
return 0;
|
|
}
|
|
|
|
static bool valid_slice_name(const char *p, size_t n) {
|
|
|
|
if (!p)
|
|
return false;
|
|
|
|
if (n < STRLEN("x.slice"))
|
|
return false;
|
|
|
|
if (memcmp(p + n - 6, ".slice", 6) == 0) {
|
|
char buf[n+1], *c;
|
|
|
|
memcpy(buf, p, n);
|
|
buf[n] = 0;
|
|
|
|
c = cg_unescape(buf);
|
|
|
|
return unit_name_is_valid(c, UNIT_NAME_PLAIN);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static const char *skip_slices(const char *p) {
|
|
assert(p);
|
|
|
|
/* Skips over all slice assignments */
|
|
|
|
for (;;) {
|
|
size_t n;
|
|
|
|
p += strspn(p, "/");
|
|
|
|
n = strcspn(p, "/");
|
|
if (!valid_slice_name(p, n))
|
|
return p;
|
|
|
|
p += n;
|
|
}
|
|
}
|
|
|
|
int cg_path_get_unit(const char *path, char **ret) {
|
|
const char *e;
|
|
char *unit;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(ret);
|
|
|
|
e = skip_slices(path);
|
|
|
|
r = cg_path_decode_unit(e, &unit);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* We skipped over the slices, don't accept any now */
|
|
if (endswith(unit, ".slice")) {
|
|
free(unit);
|
|
return -ENXIO;
|
|
}
|
|
|
|
*ret = unit;
|
|
return 0;
|
|
}
|
|
|
|
int cg_pid_get_unit(pid_t pid, char **unit) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(unit);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_unit(cgroup, unit);
|
|
}
|
|
|
|
/**
|
|
* Skip session-*.scope, but require it to be there.
|
|
*/
|
|
static const char *skip_session(const char *p) {
|
|
size_t n;
|
|
|
|
if (isempty(p))
|
|
return NULL;
|
|
|
|
p += strspn(p, "/");
|
|
|
|
n = strcspn(p, "/");
|
|
if (n < STRLEN("session-x.scope"))
|
|
return NULL;
|
|
|
|
if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) {
|
|
char buf[n - 8 - 6 + 1];
|
|
|
|
memcpy(buf, p + 8, n - 8 - 6);
|
|
buf[n - 8 - 6] = 0;
|
|
|
|
/* Note that session scopes never need unescaping,
|
|
* since they cannot conflict with the kernel's own
|
|
* names, hence we don't need to call cg_unescape()
|
|
* here. */
|
|
|
|
if (!session_id_valid(buf))
|
|
return false;
|
|
|
|
p += n;
|
|
p += strspn(p, "/");
|
|
return p;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* Skip user@*.service, but require it to be there.
|
|
*/
|
|
static const char *skip_user_manager(const char *p) {
|
|
size_t n;
|
|
|
|
if (isempty(p))
|
|
return NULL;
|
|
|
|
p += strspn(p, "/");
|
|
|
|
n = strcspn(p, "/");
|
|
if (n < STRLEN("user@x.service"))
|
|
return NULL;
|
|
|
|
if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) {
|
|
char buf[n - 5 - 8 + 1];
|
|
|
|
memcpy(buf, p + 5, n - 5 - 8);
|
|
buf[n - 5 - 8] = 0;
|
|
|
|
/* Note that user manager services never need unescaping,
|
|
* since they cannot conflict with the kernel's own
|
|
* names, hence we don't need to call cg_unescape()
|
|
* here. */
|
|
|
|
if (parse_uid(buf, NULL) < 0)
|
|
return NULL;
|
|
|
|
p += n;
|
|
p += strspn(p, "/");
|
|
|
|
return p;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static const char *skip_user_prefix(const char *path) {
|
|
const char *e, *t;
|
|
|
|
assert(path);
|
|
|
|
/* Skip slices, if there are any */
|
|
e = skip_slices(path);
|
|
|
|
/* Skip the user manager, if it's in the path now... */
|
|
t = skip_user_manager(e);
|
|
if (t)
|
|
return t;
|
|
|
|
/* Alternatively skip the user session if it is in the path... */
|
|
return skip_session(e);
|
|
}
|
|
|
|
int cg_path_get_user_unit(const char *path, char **ret) {
|
|
const char *t;
|
|
|
|
assert(path);
|
|
assert(ret);
|
|
|
|
t = skip_user_prefix(path);
|
|
if (!t)
|
|
return -ENXIO;
|
|
|
|
/* And from here on it looks pretty much the same as for a
|
|
* system unit, hence let's use the same parser from here
|
|
* on. */
|
|
return cg_path_get_unit(t, ret);
|
|
}
|
|
|
|
int cg_pid_get_user_unit(pid_t pid, char **unit) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(unit);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_user_unit(cgroup, unit);
|
|
}
|
|
|
|
int cg_path_get_machine_name(const char *path, char **machine) {
|
|
_cleanup_free_ char *u = NULL;
|
|
const char *sl;
|
|
int r;
|
|
|
|
r = cg_path_get_unit(path, &u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
sl = strjoina("/run/systemd/machines/unit:", u);
|
|
return readlink_malloc(sl, machine);
|
|
}
|
|
|
|
int cg_pid_get_machine_name(pid_t pid, char **machine) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(machine);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_machine_name(cgroup, machine);
|
|
}
|
|
|
|
int cg_path_get_session(const char *path, char **session) {
|
|
_cleanup_free_ char *unit = NULL;
|
|
char *start, *end;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = cg_path_get_unit(path, &unit);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
start = startswith(unit, "session-");
|
|
if (!start)
|
|
return -ENXIO;
|
|
end = endswith(start, ".scope");
|
|
if (!end)
|
|
return -ENXIO;
|
|
|
|
*end = 0;
|
|
if (!session_id_valid(start))
|
|
return -ENXIO;
|
|
|
|
if (session) {
|
|
char *rr;
|
|
|
|
rr = strdup(start);
|
|
if (!rr)
|
|
return -ENOMEM;
|
|
|
|
*session = rr;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_pid_get_session(pid_t pid, char **session) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_session(cgroup, session);
|
|
}
|
|
|
|
int cg_path_get_owner_uid(const char *path, uid_t *uid) {
|
|
_cleanup_free_ char *slice = NULL;
|
|
char *start, *end;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = cg_path_get_slice(path, &slice);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
start = startswith(slice, "user-");
|
|
if (!start)
|
|
return -ENXIO;
|
|
end = endswith(start, ".slice");
|
|
if (!end)
|
|
return -ENXIO;
|
|
|
|
*end = 0;
|
|
if (parse_uid(start, uid) < 0)
|
|
return -ENXIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_owner_uid(cgroup, uid);
|
|
}
|
|
|
|
int cg_path_get_slice(const char *p, char **slice) {
|
|
const char *e = NULL;
|
|
|
|
assert(p);
|
|
assert(slice);
|
|
|
|
/* Finds the right-most slice unit from the beginning, but
|
|
* stops before we come to the first non-slice unit. */
|
|
|
|
for (;;) {
|
|
size_t n;
|
|
|
|
p += strspn(p, "/");
|
|
|
|
n = strcspn(p, "/");
|
|
if (!valid_slice_name(p, n)) {
|
|
|
|
if (!e) {
|
|
char *s;
|
|
|
|
s = strdup(SPECIAL_ROOT_SLICE);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*slice = s;
|
|
return 0;
|
|
}
|
|
|
|
return cg_path_decode_unit(e, slice);
|
|
}
|
|
|
|
e = p;
|
|
p += n;
|
|
}
|
|
}
|
|
|
|
int cg_pid_get_slice(pid_t pid, char **slice) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(slice);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_slice(cgroup, slice);
|
|
}
|
|
|
|
int cg_path_get_user_slice(const char *p, char **slice) {
|
|
const char *t;
|
|
assert(p);
|
|
assert(slice);
|
|
|
|
t = skip_user_prefix(p);
|
|
if (!t)
|
|
return -ENXIO;
|
|
|
|
/* And now it looks pretty much the same as for a system
|
|
* slice, so let's just use the same parser from here on. */
|
|
return cg_path_get_slice(t, slice);
|
|
}
|
|
|
|
int cg_pid_get_user_slice(pid_t pid, char **slice) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(slice);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_user_slice(cgroup, slice);
|
|
}
|
|
|
|
char *cg_escape(const char *p) {
|
|
bool need_prefix = false;
|
|
|
|
/* This implements very minimal escaping for names to be used
|
|
* as file names in the cgroup tree: any name which might
|
|
* conflict with a kernel name or is prefixed with '_' is
|
|
* prefixed with a '_'. That way, when reading cgroup names it
|
|
* is sufficient to remove a single prefixing underscore if
|
|
* there is one. */
|
|
|
|
/* The return value of this function (unlike cg_unescape())
|
|
* needs free()! */
|
|
|
|
if (IN_SET(p[0], 0, '_', '.') ||
|
|
streq(p, "notify_on_release") ||
|
|
streq(p, "release_agent") ||
|
|
streq(p, "tasks") ||
|
|
startswith(p, "cgroup."))
|
|
need_prefix = true;
|
|
else {
|
|
const char *dot;
|
|
|
|
dot = strrchr(p, '.');
|
|
if (dot) {
|
|
CGroupController c;
|
|
size_t l = dot - p;
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
const char *n;
|
|
|
|
n = cgroup_controller_to_string(c);
|
|
|
|
if (l != strlen(n))
|
|
continue;
|
|
|
|
if (memcmp(p, n, l) != 0)
|
|
continue;
|
|
|
|
need_prefix = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (need_prefix)
|
|
return strappend("_", p);
|
|
|
|
return strdup(p);
|
|
}
|
|
|
|
char *cg_unescape(const char *p) {
|
|
assert(p);
|
|
|
|
/* The return value of this function (unlike cg_escape())
|
|
* doesn't need free()! */
|
|
|
|
if (p[0] == '_')
|
|
return (char*) p+1;
|
|
|
|
return (char*) p;
|
|
}
|
|
|
|
#define CONTROLLER_VALID \
|
|
DIGITS LETTERS \
|
|
"_"
|
|
|
|
bool cg_controller_is_valid(const char *p) {
|
|
const char *t, *s;
|
|
|
|
if (!p)
|
|
return false;
|
|
|
|
if (streq(p, SYSTEMD_CGROUP_CONTROLLER))
|
|
return true;
|
|
|
|
s = startswith(p, "name=");
|
|
if (s)
|
|
p = s;
|
|
|
|
if (IN_SET(*p, 0, '_'))
|
|
return false;
|
|
|
|
for (t = p; *t; t++)
|
|
if (!strchr(CONTROLLER_VALID, *t))
|
|
return false;
|
|
|
|
if (t - p > FILENAME_MAX)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int cg_slice_to_path(const char *unit, char **ret) {
|
|
_cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
|
|
const char *dash;
|
|
int r;
|
|
|
|
assert(unit);
|
|
assert(ret);
|
|
|
|
if (streq(unit, SPECIAL_ROOT_SLICE)) {
|
|
char *x;
|
|
|
|
x = strdup("");
|
|
if (!x)
|
|
return -ENOMEM;
|
|
*ret = x;
|
|
return 0;
|
|
}
|
|
|
|
if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN))
|
|
return -EINVAL;
|
|
|
|
if (!endswith(unit, ".slice"))
|
|
return -EINVAL;
|
|
|
|
r = unit_name_to_prefix(unit, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
dash = strchr(p, '-');
|
|
|
|
/* Don't allow initial dashes */
|
|
if (dash == p)
|
|
return -EINVAL;
|
|
|
|
while (dash) {
|
|
_cleanup_free_ char *escaped = NULL;
|
|
char n[dash - p + sizeof(".slice")];
|
|
|
|
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
|
|
/* msan doesn't instrument stpncpy, so it thinks
|
|
* n is later used unitialized:
|
|
* https://github.com/google/sanitizers/issues/926
|
|
*/
|
|
zero(n);
|
|
#endif
|
|
|
|
/* Don't allow trailing or double dashes */
|
|
if (IN_SET(dash[1], 0, '-'))
|
|
return -EINVAL;
|
|
|
|
strcpy(stpncpy(n, p, dash - p), ".slice");
|
|
if (!unit_name_is_valid(n, UNIT_NAME_PLAIN))
|
|
return -EINVAL;
|
|
|
|
escaped = cg_escape(n);
|
|
if (!escaped)
|
|
return -ENOMEM;
|
|
|
|
if (!strextend(&s, escaped, "/", NULL))
|
|
return -ENOMEM;
|
|
|
|
dash = strchr(dash+1, '-');
|
|
}
|
|
|
|
e = cg_escape(unit);
|
|
if (!e)
|
|
return -ENOMEM;
|
|
|
|
if (!strextend(&s, e, NULL))
|
|
return -ENOMEM;
|
|
|
|
*ret = TAKE_PTR(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) {
|
|
_cleanup_free_ char *p = NULL;
|
|
int r;
|
|
|
|
r = cg_get_path(controller, path, attribute, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return write_string_file(p, value, 0);
|
|
}
|
|
|
|
int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) {
|
|
_cleanup_free_ char *p = NULL;
|
|
int r;
|
|
|
|
r = cg_get_path(controller, path, attribute, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return read_one_line_file(p, ret);
|
|
}
|
|
|
|
int cg_get_keyed_attribute(
|
|
const char *controller,
|
|
const char *path,
|
|
const char *attribute,
|
|
char **keys,
|
|
char **ret_values) {
|
|
|
|
_cleanup_free_ char *filename = NULL, *contents = NULL;
|
|
const char *p;
|
|
size_t n, i, n_done = 0;
|
|
char **v;
|
|
int r;
|
|
|
|
/* Reads one or more fields of a cgroupsv2 keyed attribute file. The 'keys' parameter should be an strv with
|
|
* all keys to retrieve. The 'ret_values' parameter should be passed as string size with the same number of
|
|
* entries as 'keys'. On success each entry will be set to the value of the matching key.
|
|
*
|
|
* If the attribute file doesn't exist at all returns ENOENT, if any key is not found returns ENXIO. */
|
|
|
|
r = cg_get_path(controller, path, attribute, &filename);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = read_full_file(filename, &contents, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
n = strv_length(keys);
|
|
if (n == 0) /* No keys to retrieve? That's easy, we are done then */
|
|
return 0;
|
|
|
|
/* Let's build this up in a temporary array for now in order not to clobber the return parameter on failure */
|
|
v = newa0(char*, n);
|
|
|
|
for (p = contents; *p;) {
|
|
const char *w = NULL;
|
|
|
|
for (i = 0; i < n; i++)
|
|
if (!v[i]) {
|
|
w = first_word(p, keys[i]);
|
|
if (w)
|
|
break;
|
|
}
|
|
|
|
if (w) {
|
|
size_t l;
|
|
|
|
l = strcspn(w, NEWLINE);
|
|
v[i] = strndup(w, l);
|
|
if (!v[i]) {
|
|
r = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
n_done++;
|
|
if (n_done >= n)
|
|
goto done;
|
|
|
|
p = w + l;
|
|
} else
|
|
p += strcspn(p, NEWLINE);
|
|
|
|
p += strspn(p, NEWLINE);
|
|
}
|
|
|
|
r = -ENXIO;
|
|
|
|
fail:
|
|
for (i = 0; i < n; i++)
|
|
free(v[i]);
|
|
|
|
return r;
|
|
|
|
done:
|
|
memcpy(ret_values, v, sizeof(char*) * n);
|
|
return 0;
|
|
|
|
}
|
|
|
|
int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) {
|
|
CGroupController c;
|
|
int r;
|
|
|
|
/* This one will create a cgroup in our private tree, but also
|
|
* duplicate it in the trees specified in mask, and remove it
|
|
* in all others */
|
|
|
|
/* First create the cgroup in our own hierarchy. */
|
|
r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* If we are in the unified hierarchy, we are done now */
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0)
|
|
return 0;
|
|
|
|
/* Otherwise, do the same in the other hierarchies */
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
|
|
const char *n;
|
|
|
|
n = cgroup_controller_to_string(c);
|
|
|
|
if (mask & bit)
|
|
(void) cg_create(n, path);
|
|
else if (supported & bit)
|
|
(void) cg_trim(n, path, true);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
|
|
CGroupController c;
|
|
int r;
|
|
|
|
r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0)
|
|
return 0;
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
|
|
const char *p = NULL;
|
|
|
|
if (!(supported & bit))
|
|
continue;
|
|
|
|
if (path_callback)
|
|
p = path_callback(bit, userdata);
|
|
|
|
if (!p)
|
|
p = path;
|
|
|
|
(void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) {
|
|
Iterator i;
|
|
void *pidp;
|
|
int r = 0;
|
|
|
|
SET_FOREACH(pidp, pids, i) {
|
|
pid_t pid = PTR_TO_PID(pidp);
|
|
int q;
|
|
|
|
q = cg_attach_everywhere(supported, path, pid, path_callback, userdata);
|
|
if (q < 0 && r >= 0)
|
|
r = q;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
|
|
CGroupController c;
|
|
int r = 0, q;
|
|
|
|
if (!path_equal(from, to)) {
|
|
r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
q = cg_all_unified();
|
|
if (q < 0)
|
|
return q;
|
|
if (q > 0)
|
|
return r;
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
|
|
const char *p = NULL;
|
|
|
|
if (!(supported & bit))
|
|
continue;
|
|
|
|
if (to_callback)
|
|
p = to_callback(bit, userdata);
|
|
|
|
if (!p)
|
|
p = to;
|
|
|
|
(void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) {
|
|
CGroupController c;
|
|
int r, q;
|
|
|
|
r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
q = cg_all_unified();
|
|
if (q < 0)
|
|
return q;
|
|
if (q > 0)
|
|
return r;
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
|
|
|
|
if (!(supported & bit))
|
|
continue;
|
|
|
|
(void) cg_trim(cgroup_controller_to_string(c), path, delete_root);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_mask_to_string(CGroupMask mask, char **ret) {
|
|
_cleanup_free_ char *s = NULL;
|
|
size_t n = 0, allocated = 0;
|
|
bool space = false;
|
|
CGroupController c;
|
|
|
|
assert(ret);
|
|
|
|
if (mask == 0) {
|
|
*ret = NULL;
|
|
return 0;
|
|
}
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
const char *k;
|
|
size_t l;
|
|
|
|
if (!(mask & CGROUP_CONTROLLER_TO_MASK(c)))
|
|
continue;
|
|
|
|
k = cgroup_controller_to_string(c);
|
|
l = strlen(k);
|
|
|
|
if (!GREEDY_REALLOC(s, allocated, n + space + l + 1))
|
|
return -ENOMEM;
|
|
|
|
if (space)
|
|
s[n] = ' ';
|
|
memcpy(s + n + space, k, l);
|
|
n += space + l;
|
|
|
|
space = true;
|
|
}
|
|
|
|
assert(s);
|
|
|
|
s[n] = 0;
|
|
*ret = TAKE_PTR(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_mask_from_string(const char *value, CGroupMask *mask) {
|
|
assert(mask);
|
|
assert(value);
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *n = NULL;
|
|
CGroupController v;
|
|
int r;
|
|
|
|
r = extract_first_word(&value, &n, NULL, 0);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
break;
|
|
|
|
v = cgroup_controller_from_string(n);
|
|
if (v < 0)
|
|
continue;
|
|
|
|
*mask |= CGROUP_CONTROLLER_TO_MASK(v);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int cg_mask_supported(CGroupMask *ret) {
|
|
CGroupMask mask = 0;
|
|
int r;
|
|
|
|
/* Determines the mask of supported cgroup controllers. Only
|
|
* includes controllers we can make sense of and that are
|
|
* actually accessible. */
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) {
|
|
_cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL;
|
|
|
|
/* In the unified hierarchy we can read the supported
|
|
* and accessible controllers from a the top-level
|
|
* cgroup attribute */
|
|
|
|
r = cg_get_root_path(&root);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = read_one_line_file(path, &controllers);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_mask_from_string(controllers, &mask);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Currently, we support the cpu, memory, io and pids
|
|
* controller in the unified hierarchy, mask
|
|
* everything else off. */
|
|
mask &= CGROUP_MASK_CPU | CGROUP_MASK_MEMORY | CGROUP_MASK_IO | CGROUP_MASK_PIDS;
|
|
|
|
} else {
|
|
CGroupController c;
|
|
|
|
/* In the legacy hierarchy, we check whether which
|
|
* hierarchies are mounted. */
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
const char *n;
|
|
|
|
n = cgroup_controller_to_string(c);
|
|
if (controller_is_accessible(n) >= 0)
|
|
mask |= CGROUP_CONTROLLER_TO_MASK(c);
|
|
}
|
|
}
|
|
|
|
*ret = mask;
|
|
return 0;
|
|
}
|
|
|
|
int cg_kernel_controllers(Set **ret) {
|
|
_cleanup_set_free_free_ Set *controllers = NULL;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
/* Determines the full list of kernel-known controllers. Might
|
|
* include controllers we don't actually support, arbitrary
|
|
* named hierarchies and controllers that aren't currently
|
|
* accessible (because not mounted). */
|
|
|
|
controllers = set_new(&string_hash_ops);
|
|
if (!controllers)
|
|
return -ENOMEM;
|
|
|
|
f = fopen("/proc/cgroups", "re");
|
|
if (!f) {
|
|
if (errno == ENOENT) {
|
|
*ret = NULL;
|
|
return 0;
|
|
}
|
|
|
|
return -errno;
|
|
}
|
|
|
|
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
|
|
|
/* Ignore the header line */
|
|
(void) read_line(f, (size_t) -1, NULL);
|
|
|
|
for (;;) {
|
|
char *controller;
|
|
int enabled = 0;
|
|
|
|
errno = 0;
|
|
if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
|
|
|
|
if (feof(f))
|
|
break;
|
|
|
|
if (ferror(f) && errno > 0)
|
|
return -errno;
|
|
|
|
return -EBADMSG;
|
|
}
|
|
|
|
if (!enabled) {
|
|
free(controller);
|
|
continue;
|
|
}
|
|
|
|
if (!cg_controller_is_valid(controller)) {
|
|
free(controller);
|
|
return -EBADMSG;
|
|
}
|
|
|
|
r = set_consume(controllers, controller);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
*ret = controllers;
|
|
controllers = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN;
|
|
|
|
/* The hybrid mode was initially implemented in v232 and simply mounted cgroup v2 on /sys/fs/cgroup/systemd. This
|
|
* unfortunately broke other tools (such as docker) which expected the v1 "name=systemd" hierarchy on
|
|
* /sys/fs/cgroup/systemd. From v233 and on, the hybrid mode mountnbs v2 on /sys/fs/cgroup/unified and maintains
|
|
* "name=systemd" hierarchy on /sys/fs/cgroup/systemd for compatibility with other tools.
|
|
*
|
|
* To keep live upgrade working, we detect and support v232 layout. When v232 layout is detected, to keep cgroup v2
|
|
* process management but disable the compat dual layout, we return %true on
|
|
* cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) and %false on cg_hybrid_unified().
|
|
*/
|
|
static thread_local bool unified_systemd_v232;
|
|
|
|
static int cg_unified_update(void) {
|
|
|
|
struct statfs fs;
|
|
|
|
/* Checks if we support the unified hierarchy. Returns an
|
|
* error when the cgroup hierarchies aren't mounted yet or we
|
|
* have any other trouble determining if the unified hierarchy
|
|
* is supported. */
|
|
|
|
if (unified_cache >= CGROUP_UNIFIED_NONE)
|
|
return 0;
|
|
|
|
if (statfs("/sys/fs/cgroup/", &fs) < 0)
|
|
return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/\") failed: %m");
|
|
|
|
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
|
|
log_debug("Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy");
|
|
unified_cache = CGROUP_UNIFIED_ALL;
|
|
} else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
|
|
if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 &&
|
|
F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
|
|
log_debug("Found cgroup2 on /sys/fs/cgroup/unified, unified hierarchy for systemd controller");
|
|
unified_cache = CGROUP_UNIFIED_SYSTEMD;
|
|
unified_systemd_v232 = false;
|
|
} else {
|
|
if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
|
|
return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/systemd\" failed: %m");
|
|
|
|
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
|
|
log_debug("Found cgroup2 on /sys/fs/cgroup/systemd, unified hierarchy for systemd controller (v232 variant)");
|
|
unified_cache = CGROUP_UNIFIED_SYSTEMD;
|
|
unified_systemd_v232 = true;
|
|
} else if (F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC)) {
|
|
log_debug("Found cgroup on /sys/fs/cgroup/systemd, legacy hierarchy");
|
|
unified_cache = CGROUP_UNIFIED_NONE;
|
|
} else {
|
|
log_debug("Unexpected filesystem type %llx mounted on /sys/fs/cgroup/systemd, assuming legacy hierarchy",
|
|
(unsigned long long) fs.f_type);
|
|
unified_cache = CGROUP_UNIFIED_NONE;
|
|
}
|
|
}
|
|
} else {
|
|
log_debug("Unknown filesystem type %llx mounted on /sys/fs/cgroup.",
|
|
(unsigned long long) fs.f_type);
|
|
return -ENOMEDIUM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_unified_controller(const char *controller) {
|
|
int r;
|
|
|
|
r = cg_unified_update();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (unified_cache == CGROUP_UNIFIED_NONE)
|
|
return false;
|
|
|
|
if (unified_cache >= CGROUP_UNIFIED_ALL)
|
|
return true;
|
|
|
|
return streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER);
|
|
}
|
|
|
|
int cg_all_unified(void) {
|
|
int r;
|
|
|
|
r = cg_unified_update();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return unified_cache >= CGROUP_UNIFIED_ALL;
|
|
}
|
|
|
|
int cg_hybrid_unified(void) {
|
|
int r;
|
|
|
|
r = cg_unified_update();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return unified_cache == CGROUP_UNIFIED_SYSTEMD && !unified_systemd_v232;
|
|
}
|
|
|
|
int cg_unified_flush(void) {
|
|
unified_cache = CGROUP_UNIFIED_UNKNOWN;
|
|
|
|
return cg_unified_update();
|
|
}
|
|
|
|
int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
_cleanup_free_ char *fs = NULL;
|
|
CGroupController c;
|
|
int r;
|
|
|
|
assert(p);
|
|
|
|
if (supported == 0)
|
|
return 0;
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0) /* on the legacy hiearchy there's no joining of controllers defined */
|
|
return 0;
|
|
|
|
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
|
|
const char *n;
|
|
|
|
if (!(supported & bit))
|
|
continue;
|
|
|
|
n = cgroup_controller_to_string(c);
|
|
{
|
|
char s[1 + strlen(n) + 1];
|
|
|
|
s[0] = mask & bit ? '+' : '-';
|
|
strcpy(s + 1, n);
|
|
|
|
if (!f) {
|
|
f = fopen(fs, "we");
|
|
if (!f) {
|
|
log_debug_errno(errno, "Failed to open cgroup.subtree_control file of %s: %m", p);
|
|
break;
|
|
}
|
|
}
|
|
|
|
r = write_string_stream(f, s, 0);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool cg_is_unified_wanted(void) {
|
|
static thread_local int wanted = -1;
|
|
int r;
|
|
bool b;
|
|
const bool is_default = DEFAULT_HIERARCHY == CGROUP_UNIFIED_ALL;
|
|
|
|
/* If we have a cached value, return that. */
|
|
if (wanted >= 0)
|
|
return wanted;
|
|
|
|
/* If the hierarchy is already mounted, then follow whatever
|
|
* was chosen for it. */
|
|
if (cg_unified_flush() >= 0)
|
|
return (wanted = unified_cache >= CGROUP_UNIFIED_ALL);
|
|
|
|
/* Otherwise, let's see what the kernel command line has to say.
|
|
* Since checking is expensive, cache a non-error result. */
|
|
r = proc_cmdline_get_bool("systemd.unified_cgroup_hierarchy", &b);
|
|
|
|
return (wanted = r > 0 ? b : is_default);
|
|
}
|
|
|
|
bool cg_is_legacy_wanted(void) {
|
|
static thread_local int wanted = -1;
|
|
|
|
/* If we have a cached value, return that. */
|
|
if (wanted >= 0)
|
|
return wanted;
|
|
|
|
/* Check if we have cgroups2 already mounted. */
|
|
if (cg_unified_flush() >= 0 &&
|
|
unified_cache == CGROUP_UNIFIED_ALL)
|
|
return (wanted = false);
|
|
|
|
/* Otherwise, assume that at least partial legacy is wanted,
|
|
* since cgroups2 should already be mounted at this point. */
|
|
return (wanted = true);
|
|
}
|
|
|
|
bool cg_is_hybrid_wanted(void) {
|
|
static thread_local int wanted = -1;
|
|
int r;
|
|
bool b;
|
|
const bool is_default = DEFAULT_HIERARCHY >= CGROUP_UNIFIED_SYSTEMD;
|
|
/* We default to true if the default is "hybrid", obviously,
|
|
* but also when the default is "unified", because if we get
|
|
* called, it means that unified hierarchy was not mounted. */
|
|
|
|
/* If we have a cached value, return that. */
|
|
if (wanted >= 0)
|
|
return wanted;
|
|
|
|
/* If the hierarchy is already mounted, then follow whatever
|
|
* was chosen for it. */
|
|
if (cg_unified_flush() >= 0 &&
|
|
unified_cache == CGROUP_UNIFIED_ALL)
|
|
return (wanted = false);
|
|
|
|
/* Otherwise, let's see what the kernel command line has to say.
|
|
* Since checking is expensive, cache a non-error result. */
|
|
r = proc_cmdline_get_bool("systemd.legacy_systemd_cgroup_controller", &b);
|
|
|
|
/* The meaning of the kernel option is reversed wrt. to the return value
|
|
* of this function, hence the negation. */
|
|
return (wanted = r > 0 ? !b : is_default);
|
|
}
|
|
|
|
int cg_weight_parse(const char *s, uint64_t *ret) {
|
|
uint64_t u;
|
|
int r;
|
|
|
|
if (isempty(s)) {
|
|
*ret = CGROUP_WEIGHT_INVALID;
|
|
return 0;
|
|
}
|
|
|
|
r = safe_atou64(s, &u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (u < CGROUP_WEIGHT_MIN || u > CGROUP_WEIGHT_MAX)
|
|
return -ERANGE;
|
|
|
|
*ret = u;
|
|
return 0;
|
|
}
|
|
|
|
const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX] = {
|
|
[CGROUP_IO_RBPS_MAX] = CGROUP_LIMIT_MAX,
|
|
[CGROUP_IO_WBPS_MAX] = CGROUP_LIMIT_MAX,
|
|
[CGROUP_IO_RIOPS_MAX] = CGROUP_LIMIT_MAX,
|
|
[CGROUP_IO_WIOPS_MAX] = CGROUP_LIMIT_MAX,
|
|
};
|
|
|
|
static const char* const cgroup_io_limit_type_table[_CGROUP_IO_LIMIT_TYPE_MAX] = {
|
|
[CGROUP_IO_RBPS_MAX] = "IOReadBandwidthMax",
|
|
[CGROUP_IO_WBPS_MAX] = "IOWriteBandwidthMax",
|
|
[CGROUP_IO_RIOPS_MAX] = "IOReadIOPSMax",
|
|
[CGROUP_IO_WIOPS_MAX] = "IOWriteIOPSMax",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(cgroup_io_limit_type, CGroupIOLimitType);
|
|
|
|
int cg_cpu_shares_parse(const char *s, uint64_t *ret) {
|
|
uint64_t u;
|
|
int r;
|
|
|
|
if (isempty(s)) {
|
|
*ret = CGROUP_CPU_SHARES_INVALID;
|
|
return 0;
|
|
}
|
|
|
|
r = safe_atou64(s, &u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (u < CGROUP_CPU_SHARES_MIN || u > CGROUP_CPU_SHARES_MAX)
|
|
return -ERANGE;
|
|
|
|
*ret = u;
|
|
return 0;
|
|
}
|
|
|
|
int cg_blkio_weight_parse(const char *s, uint64_t *ret) {
|
|
uint64_t u;
|
|
int r;
|
|
|
|
if (isempty(s)) {
|
|
*ret = CGROUP_BLKIO_WEIGHT_INVALID;
|
|
return 0;
|
|
}
|
|
|
|
r = safe_atou64(s, &u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (u < CGROUP_BLKIO_WEIGHT_MIN || u > CGROUP_BLKIO_WEIGHT_MAX)
|
|
return -ERANGE;
|
|
|
|
*ret = u;
|
|
return 0;
|
|
}
|
|
|
|
bool is_cgroup_fs(const struct statfs *s) {
|
|
return is_fs_type(s, CGROUP_SUPER_MAGIC) ||
|
|
is_fs_type(s, CGROUP2_SUPER_MAGIC);
|
|
}
|
|
|
|
bool fd_is_cgroup_fs(int fd) {
|
|
struct statfs s;
|
|
|
|
if (fstatfs(fd, &s) < 0)
|
|
return -errno;
|
|
|
|
return is_cgroup_fs(&s);
|
|
}
|
|
|
|
static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
|
|
[CGROUP_CONTROLLER_CPU] = "cpu",
|
|
[CGROUP_CONTROLLER_CPUACCT] = "cpuacct",
|
|
[CGROUP_CONTROLLER_IO] = "io",
|
|
[CGROUP_CONTROLLER_BLKIO] = "blkio",
|
|
[CGROUP_CONTROLLER_MEMORY] = "memory",
|
|
[CGROUP_CONTROLLER_DEVICES] = "devices",
|
|
[CGROUP_CONTROLLER_PIDS] = "pids",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);
|