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-rw-r--r--src/core/cgroup.c586
-rw-r--r--src/core/cgroup.h32
-rw-r--r--src/core/dbus-cgroup.c26
-rw-r--r--src/core/dbus-unit.c3
-rw-r--r--src/core/execute.h2
-rw-r--r--src/core/manager.c6
-rw-r--r--src/core/manager.h12
-rw-r--r--src/core/mount-setup.c11
-rw-r--r--src/core/scope.c67
-rw-r--r--src/core/service.c16
-rw-r--r--src/core/slice.c43
-rw-r--r--src/core/unit.c168
-rw-r--r--src/core/unit.h10
13 files changed, 678 insertions, 304 deletions
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index e92d2cc850..a70b4d33ae 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -283,7 +283,7 @@ fail:
return -errno;
}
-void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path, ManagerState state) {
+void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, ManagerState state) {
bool is_root;
int r;
@@ -304,7 +304,7 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha
* cgroup trees (assuming we are running in a container then),
* and missing cgroups, i.e. EROFS and ENOENT. */
- if ((mask & CGROUP_CPU) && !is_root) {
+ if ((mask & CGROUP_MASK_CPU) && !is_root) {
char buf[MAX(DECIMAL_STR_MAX(unsigned long), DECIMAL_STR_MAX(usec_t)) + 1];
sprintf(buf, "%lu\n",
@@ -331,7 +331,7 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha
"Failed to set cpu.cfs_quota_us on %s: %m", path);
}
- if (mask & CGROUP_BLKIO) {
+ if (mask & CGROUP_MASK_BLKIO) {
char buf[MAX3(DECIMAL_STR_MAX(unsigned long)+1,
DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(unsigned long)*1,
DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1)];
@@ -381,21 +381,30 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha
}
}
- if ((mask & CGROUP_MEMORY) && !is_root) {
+ if ((mask & CGROUP_MASK_MEMORY) && !is_root) {
if (c->memory_limit != (uint64_t) -1) {
char buf[DECIMAL_STR_MAX(uint64_t) + 1];
sprintf(buf, "%" PRIu64 "\n", c->memory_limit);
- r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
- } else
- r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1");
+
+ if (cg_unified() <= 0)
+ r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
+ else
+ r = cg_set_attribute("memory", path, "memory.max", buf);
+
+ } else {
+ if (cg_unified() <= 0)
+ r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1");
+ else
+ r = cg_set_attribute("memory", path, "memory.max", "max");
+ }
if (r < 0)
log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
- "Failed to set memory.limit_in_bytes on %s: %m", path);
+ "Failed to set memory.limit_in_bytes/memory.max on %s: %m", path);
}
- if ((mask & CGROUP_DEVICE) && !is_root) {
+ if ((mask & CGROUP_MASK_DEVICE) && !is_root) {
CGroupDeviceAllow *a;
/* Changing the devices list of a populated cgroup
@@ -459,8 +468,8 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha
}
}
-CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) {
- CGroupControllerMask mask = 0;
+CGroupMask cgroup_context_get_mask(CGroupContext *c) {
+ CGroupMask mask = 0;
/* Figure out which controllers we need */
@@ -468,29 +477,31 @@ CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) {
c->cpu_shares != (unsigned long) -1 ||
c->startup_cpu_shares != (unsigned long) -1 ||
c->cpu_quota_per_sec_usec != USEC_INFINITY)
- mask |= CGROUP_CPUACCT | CGROUP_CPU;
+ mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU;
if (c->blockio_accounting ||
c->blockio_weight != (unsigned long) -1 ||
c->startup_blockio_weight != (unsigned long) -1 ||
c->blockio_device_weights ||
c->blockio_device_bandwidths)
- mask |= CGROUP_BLKIO;
+ mask |= CGROUP_MASK_BLKIO;
if (c->memory_accounting ||
c->memory_limit != (uint64_t) -1)
- mask |= CGROUP_MEMORY;
+ mask |= CGROUP_MASK_MEMORY;
if (c->device_allow ||
c->device_policy != CGROUP_AUTO)
- mask |= CGROUP_DEVICE;
+ mask |= CGROUP_MASK_DEVICE;
return mask;
}
-CGroupControllerMask unit_get_cgroup_mask(Unit *u) {
+CGroupMask unit_get_own_mask(Unit *u) {
CGroupContext *c;
+ /* Returns the mask of controllers the unit needs for itself */
+
c = unit_get_cgroup_context(u);
if (!c)
return 0;
@@ -505,15 +516,18 @@ CGroupControllerMask unit_get_cgroup_mask(Unit *u) {
e = unit_get_exec_context(u);
if (!e || exec_context_maintains_privileges(e))
- return _CGROUP_CONTROLLER_MASK_ALL;
+ return _CGROUP_MASK_ALL;
}
return cgroup_context_get_mask(c);
}
-CGroupControllerMask unit_get_members_mask(Unit *u) {
+CGroupMask unit_get_members_mask(Unit *u) {
assert(u);
+ /* Returns the mask of controllers all of the unit's children
+ * require, merged */
+
if (u->cgroup_members_mask_valid)
return u->cgroup_members_mask;
@@ -532,7 +546,7 @@ CGroupControllerMask unit_get_members_mask(Unit *u) {
continue;
u->cgroup_members_mask |=
- unit_get_cgroup_mask(member) |
+ unit_get_own_mask(member) |
unit_get_members_mask(member);
}
}
@@ -541,19 +555,52 @@ CGroupControllerMask unit_get_members_mask(Unit *u) {
return u->cgroup_members_mask;
}
-CGroupControllerMask unit_get_siblings_mask(Unit *u) {
+CGroupMask unit_get_siblings_mask(Unit *u) {
assert(u);
+ /* Returns the mask of controllers all of the unit's siblings
+ * require, i.e. the members mask of the unit's parent slice
+ * if there is one. */
+
if (UNIT_ISSET(u->slice))
return unit_get_members_mask(UNIT_DEREF(u->slice));
- return unit_get_cgroup_mask(u) | unit_get_members_mask(u);
+ return unit_get_own_mask(u) | unit_get_members_mask(u);
}
-CGroupControllerMask unit_get_target_mask(Unit *u) {
- CGroupControllerMask mask;
+CGroupMask unit_get_subtree_mask(Unit *u) {
+
+ /* Returns the mask of this subtree, meaning of the group
+ * itself and its children. */
+
+ return unit_get_own_mask(u) | unit_get_members_mask(u);
+}
+
+CGroupMask unit_get_target_mask(Unit *u) {
+ CGroupMask mask;
+
+ /* This returns the cgroup mask of all controllers to enable
+ * for a specific cgroup, i.e. everything it needs itself,
+ * plus all that its children need, plus all that its siblings
+ * need. This is primarily useful on the legacy cgroup
+ * hierarchy, where we need to duplicate each cgroup in each
+ * hierarchy that shall be enabled for it. */
- mask = unit_get_cgroup_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
+ mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
+ mask &= u->manager->cgroup_supported;
+
+ return mask;
+}
+
+CGroupMask unit_get_enable_mask(Unit *u) {
+ CGroupMask mask;
+
+ /* This returns the cgroup mask of all controllers to enable
+ * for the children of a specific cgroup. This is primarily
+ * useful for the unified cgroup hierarchy, where each cgroup
+ * controls which controllers are enabled for its children. */
+
+ mask = unit_get_members_mask(u);
mask &= u->manager->cgroup_supported;
return mask;
@@ -562,13 +609,13 @@ CGroupControllerMask unit_get_target_mask(Unit *u) {
/* Recurse from a unit up through its containing slices, propagating
* mask bits upward. A unit is also member of itself. */
void unit_update_cgroup_members_masks(Unit *u) {
- CGroupControllerMask m;
+ CGroupMask m;
bool more;
assert(u);
/* Calculate subtree mask */
- m = unit_get_cgroup_mask(u) | unit_get_members_mask(u);
+ m = unit_get_subtree_mask(u);
/* See if anything changed from the previous invocation. If
* not, we're done. */
@@ -608,7 +655,7 @@ void unit_update_cgroup_members_masks(Unit *u) {
}
}
-static const char *migrate_callback(CGroupControllerMask mask, void *userdata) {
+static const char *migrate_callback(CGroupMask mask, void *userdata) {
Unit *u = userdata;
assert(mask != 0);
@@ -626,7 +673,115 @@ static const char *migrate_callback(CGroupControllerMask mask, void *userdata) {
return NULL;
}
-static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
+char *unit_default_cgroup_path(Unit *u) {
+ _cleanup_free_ char *escaped = NULL, *slice = NULL;
+ int r;
+
+ assert(u);
+
+ if (unit_has_name(u, SPECIAL_ROOT_SLICE))
+ return strdup(u->manager->cgroup_root);
+
+ if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
+ r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
+ if (r < 0)
+ return NULL;
+ }
+
+ escaped = cg_escape(u->id);
+ if (!escaped)
+ return NULL;
+
+ if (slice)
+ return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL);
+ else
+ return strjoin(u->manager->cgroup_root, "/", escaped, NULL);
+}
+
+int unit_set_cgroup_path(Unit *u, const char *path) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ assert(u);
+
+ if (path) {
+ p = strdup(path);
+ if (!p)
+ return -ENOMEM;
+ } else
+ p = NULL;
+
+ if (streq_ptr(u->cgroup_path, p))
+ return 0;
+
+ if (p) {
+ r = hashmap_put(u->manager->cgroup_unit, p, u);
+ if (r < 0)
+ return r;
+ }
+
+ unit_release_cgroup(u);
+
+ u->cgroup_path = p;
+ p = NULL;
+
+ return 1;
+}
+
+int unit_watch_cgroup(Unit *u) {
+ _cleanup_free_ char *populated = NULL;
+ int r;
+
+ assert(u);
+
+ if (!u->cgroup_path)
+ return 0;
+
+ if (u->cgroup_inotify_wd >= 0)
+ return 0;
+
+ /* Only applies to the unified hierarchy */
+ r = cg_unified();
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed detect wether the unified hierarchy is used: %m");
+ if (r == 0)
+ return 0;
+
+ /* Don't watch the root slice, it's pointless. */
+ if (unit_has_name(u, SPECIAL_ROOT_SLICE))
+ return 0;
+
+ r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops);
+ if (r < 0)
+ return log_oom();
+
+ r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.populated", &populated);
+ if (r < 0)
+ return log_oom();
+
+ u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, populated, IN_MODIFY);
+ if (u->cgroup_inotify_wd < 0) {
+
+ if (errno == ENOENT) /* If the directory is already
+ * gone we don't need to track
+ * it, so this is not an error */
+ return 0;
+
+ return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path);
+ }
+
+ r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u);
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m");
+
+ return 0;
+}
+
+static int unit_create_cgroup(
+ Unit *u,
+ CGroupMask target_mask,
+ CGroupMask enable_mask) {
+
CGroupContext *c;
int r;
@@ -643,25 +798,29 @@ static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
if (!path)
return log_oom();
- r = hashmap_put(u->manager->cgroup_unit, path, u);
- if (r < 0) {
- log_error(r == -EEXIST ? "cgroup %s exists already: %s" : "hashmap_put failed for %s: %s", path, strerror(-r));
- return r;
- }
- if (r > 0) {
- u->cgroup_path = path;
- path = NULL;
- }
+ r = unit_set_cgroup_path(u, path);
+ if (r == -EEXIST)
+ return log_unit_error_errno(u, r, "Control group %s exists already.", path);
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
}
/* First, create our own group */
- r = cg_create_everywhere(u->manager->cgroup_supported, mask, u->cgroup_path);
+ r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
+ if (r < 0)
+ return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
+
+ /* Start watching it */
+ (void) unit_watch_cgroup(u);
+
+ /* Enable all controllers we need */
+ r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path);
if (r < 0)
- return log_error_errno(r, "Failed to create cgroup %s: %m", u->cgroup_path);
+ log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
/* Keep track that this is now realized */
u->cgroup_realized = true;
- u->cgroup_realized_mask = mask;
+ u->cgroup_realized_mask = target_mask;
if (u->type != UNIT_SLICE && !c->delegate) {
@@ -670,7 +829,7 @@ static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
* for slice and delegation units. */
r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
if (r < 0)
- log_warning_errno(r, "Failed to migrate cgroup from to %s: %m", u->cgroup_path);
+ log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
}
return 0;
@@ -691,10 +850,10 @@ int unit_attach_pids_to_cgroup(Unit *u) {
return 0;
}
-static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) {
+static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask) {
assert(u);
- return u->cgroup_realized && u->cgroup_realized_mask == mask;
+ return u->cgroup_realized && u->cgroup_realized_mask == target_mask;
}
/* Check if necessary controllers and attributes for a unit are in place.
@@ -704,7 +863,7 @@ static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) {
*
* Returns 0 on success and < 0 on failure. */
static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
- CGroupControllerMask mask;
+ CGroupMask target_mask, enable_mask;
int r;
assert(u);
@@ -714,9 +873,8 @@ static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
u->in_cgroup_queue = false;
}
- mask = unit_get_target_mask(u);
-
- if (unit_has_mask_realized(u, mask))
+ target_mask = unit_get_target_mask(u);
+ if (unit_has_mask_realized(u, target_mask))
return 0;
/* First, realize parents */
@@ -727,12 +885,13 @@ static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
}
/* And then do the real work */
- r = unit_create_cgroups(u, mask);
+ enable_mask = unit_get_enable_mask(u);
+ r = unit_create_cgroup(u, target_mask, enable_mask);
if (r < 0)
return r;
/* Finally, apply the necessary attributes. */
- cgroup_context_apply(unit_get_cgroup_context(u), mask, u->cgroup_path, state);
+ cgroup_context_apply(unit_get_cgroup_context(u), target_mask, u->cgroup_path, state);
return 0;
}
@@ -759,7 +918,7 @@ unsigned manager_dispatch_cgroup_queue(Manager *m) {
r = unit_realize_cgroup_now(i, state);
if (r < 0)
- log_warning_errno(r, "Failed to realize cgroups for queued unit %s: %m", i->id);
+ log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
n++;
}
@@ -829,39 +988,67 @@ int unit_realize_cgroup(Unit *u) {
return unit_realize_cgroup_now(u, manager_state(u->manager));
}
-void unit_destroy_cgroup_if_empty(Unit *u) {
+void unit_release_cgroup(Unit *u) {
+ assert(u);
+
+ /* Forgets all cgroup details for this cgroup */
+
+ if (u->cgroup_path) {
+ (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
+ u->cgroup_path = mfree(u->cgroup_path);
+ }
+
+ if (u->cgroup_inotify_wd >= 0) {
+ if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0)
+ log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id);
+
+ (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd));
+ u->cgroup_inotify_wd = -1;
+ }
+}
+
+void unit_prune_cgroup(Unit *u) {
int r;
+ bool is_root_slice;
assert(u);
+ /* Removes the cgroup, if empty and possible, and stops watching it. */
+
if (!u->cgroup_path)
return;
- r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !unit_has_name(u, SPECIAL_ROOT_SLICE));
+ is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
+
+ r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
if (r < 0) {
- log_debug_errno(r, "Failed to destroy cgroup %s: %m", u->cgroup_path);
+ log_debug_errno(r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
return;
}
- hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
+ if (is_root_slice)
+ return;
+
+ unit_release_cgroup(u);
- free(u->cgroup_path);
- u->cgroup_path = NULL;
u->cgroup_realized = false;
u->cgroup_realized_mask = 0;
}
-pid_t unit_search_main_pid(Unit *u) {
+int unit_search_main_pid(Unit *u, pid_t *ret) {
_cleanup_fclose_ FILE *f = NULL;
pid_t pid = 0, npid, mypid;
+ int r;
assert(u);
+ assert(ret);
if (!u->cgroup_path)
- return 0;
+ return -ENXIO;
- if (cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f) < 0)
- return 0;
+ r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
+ if (r < 0)
+ return r;
mypid = getpid();
while (cg_read_pid(f, &npid) > 0) {
@@ -874,90 +1061,274 @@ pid_t unit_search_main_pid(Unit *u) {
if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid)
continue;
- if (pid != 0) {
+ if (pid != 0)
/* Dang, there's more than one daemonized PID
in this group, so we don't know what process
is the main process. */
- pid = 0;
- break;
- }
+
+ return -ENODATA;
pid = npid;
}
- return pid;
+ *ret = pid;
+ return 0;
+}
+
+static int unit_watch_pids_in_path(Unit *u, const char *path) {
+ _cleanup_closedir_ DIR *d = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int ret = 0, r;
+
+ assert(u);
+ assert(path);
+
+ r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
+ if (r < 0)
+ ret = r;
+ else {
+ pid_t pid;
+
+ while ((r = cg_read_pid(f, &pid)) > 0) {
+ r = unit_watch_pid(u, pid);
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
+ if (r < 0) {
+ if (ret >= 0)
+ ret = r;
+ } else {
+ char *fn;
+
+ while ((r = cg_read_subgroup(d, &fn)) > 0) {
+ _cleanup_free_ char *p = NULL;
+
+ p = strjoin(path, "/", fn, NULL);
+ free(fn);
+
+ if (!p)
+ return -ENOMEM;
+
+ r = unit_watch_pids_in_path(u, p);
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ if (r < 0 && ret >= 0)
+ ret = r;
+ }
+
+ return ret;
+}
+
+int unit_watch_all_pids(Unit *u) {
+ assert(u);
+
+ /* Adds all PIDs from our cgroup to the set of PIDs we
+ * watch. This is a fallback logic for cases where we do not
+ * get reliable cgroup empty notifications: we try to use
+ * SIGCHLD as replacement. */
+
+ if (!u->cgroup_path)
+ return -ENOENT;
+
+ if (cg_unified() > 0) /* On unified we can use proper notifications */
+ return 0;
+
+ return unit_watch_pids_in_path(u, u->cgroup_path);
+}
+
+int unit_notify_cgroup_empty(Unit *u) {
+ int r;
+
+ assert(u);
+
+ if (!u->cgroup_path)
+ return 0;
+
+ r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
+ if (r <= 0)
+ return r;
+
+ unit_add_to_gc_queue(u);
+
+ if (UNIT_VTABLE(u)->notify_cgroup_empty)
+ UNIT_VTABLE(u)->notify_cgroup_empty(u);
+
+ return 0;
+}
+
+static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ Manager *m = userdata;
+
+ assert(s);
+ assert(fd >= 0);
+ assert(m);
+
+ for (;;) {
+ union inotify_event_buffer buffer;
+ struct inotify_event *e;
+ ssize_t l;
+
+ l = read(fd, &buffer, sizeof(buffer));
+ if (l < 0) {
+ if (errno == EINTR || errno == EAGAIN)
+ return 0;
+
+ return log_error_errno(errno, "Failed to read control group inotify events: %m");
+ }
+
+ FOREACH_INOTIFY_EVENT(e, buffer, l) {
+ Unit *u;
+
+ if (e->wd < 0)
+ /* Queue overflow has no watch descriptor */
+ continue;
+
+ if (e->mask & IN_IGNORED)
+ /* The watch was just removed */
+ continue;
+
+ u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd));
+ if (!u) /* Not that inotify might deliver
+ * events for a watch even after it
+ * was removed, because it was queued
+ * before the removal. Let's ignore
+ * this here safely. */
+ continue;
+
+ (void) unit_notify_cgroup_empty(u);
+ }
+ }
}
int manager_setup_cgroup(Manager *m) {
_cleanup_free_ char *path = NULL;
- int r;
+ CGroupController c;
+ int r, unified;
+ char *e;
assert(m);
/* 1. Determine hierarchy */
- free(m->cgroup_root);
- m->cgroup_root = NULL;
-
+ m->cgroup_root = mfree(m->cgroup_root);
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
if (r < 0)
return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
- /* LEGACY: Already in /system.slice? If so, let's cut this
- * off. This is to support live upgrades from older systemd
- * versions where PID 1 was moved there. */
- if (m->running_as == MANAGER_SYSTEM) {
- char *e;
+ /* Chop off the init scope, if we are already located in it */
+ e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
+ /* LEGACY: Also chop off the system slice if we are in
+ * it. This is to support live upgrades from older systemd
+ * versions where PID 1 was moved there. Also see
+ * cg_get_root_path(). */
+ if (!e && m->running_as == MANAGER_SYSTEM) {
e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
if (!e)
- e = endswith(m->cgroup_root, "/system");
- if (e)
- *e = 0;
+ e = endswith(m->cgroup_root, "/system"); /* even more legacy */
}
+ if (e)
+ *e = 0;
/* And make sure to store away the root value without trailing
* slash, even for the root dir, so that we can easily prepend
* it everywhere. */
- if (streq(m->cgroup_root, "/"))
- m->cgroup_root[0] = 0;
+ while ((e = endswith(m->cgroup_root, "/")))
+ *e = 0;
/* 2. Show data */
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
if (r < 0)
return log_error_errno(r, "Cannot find cgroup mount point: %m");
- log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
+ unified = cg_unified();
+ if (unified < 0)
+ return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
+ if (unified > 0)
+ log_debug("Unified cgroup hierarchy is located at %s.", path);
+ else
+ log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
+
if (!m->test_run) {
+ const char *scope_path;
/* 3. Install agent */
- if (m->running_as == MANAGER_SYSTEM) {
+ if (unified) {
+
+ /* In the unified hierarchy we can can get
+ * cgroup empty notifications via inotify. */
+
+ m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
+ safe_close(m->cgroup_inotify_fd);
+
+ m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
+ if (m->cgroup_inotify_fd < 0)
+ return log_error_errno(errno, "Failed to create control group inotify object: %m");
+
+ r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
+ if (r < 0)
+ return log_error_errno(r, "Failed to watch control group inotify object: %m");
+
+ r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_IDLE - 5);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set priority of inotify event source: %m");
+
+ (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
+
+ } else if (m->running_as == MANAGER_SYSTEM) {
+
+ /* On the legacy hierarchy we only get
+ * notifications via cgroup agents. (Which
+ * isn't really reliable, since it does not
+ * generate events when control groups with
+ * children run empty. */
+
r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
if (r < 0)
log_warning_errno(r, "Failed to install release agent, ignoring: %m");
else if (r > 0)
log_debug("Installed release agent.");
- else
+ else if (r == 0)
log_debug("Release agent already installed.");
}
- /* 4. Make sure we are in the root cgroup */
- r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0);
+ /* 4. Make sure we are in the special "init.scope" unit in the root slice. */
+ scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
+ r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
if (r < 0)
- return log_error_errno(r, "Failed to create root cgroup hierarchy: %m");
+ return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
+
+ /* also, move all other userspace processes remaining
+ * in the root cgroup into that scope. */
+ r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, false);
+ if (r < 0)
+ log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
/* 5. And pin it, so that it cannot be unmounted */
safe_close(m->pin_cgroupfs_fd);
-
m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
if (m->pin_cgroupfs_fd < 0)
return log_error_errno(errno, "Failed to open pin file: %m");
/* 6. Always enable hierarchical support if it exists... */
- cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
+ if (!unified)
+ (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
}
/* 7. Figure out which controllers are supported */
- m->cgroup_supported = cg_mask_supported();
+ r = cg_mask_supported(&m->cgroup_supported);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine supported controllers: %m");
+
+ for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
+ log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & c));
return 0;
}
@@ -968,12 +1339,16 @@ void manager_shutdown_cgroup(Manager *m, bool delete) {
/* We can't really delete the group, since we are in it. But
* let's trim it. */
if (delete && m->cgroup_root)
- cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
+ (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
+
+ m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit);
+
+ m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
+ m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
- free(m->cgroup_root);
- m->cgroup_root = NULL;
+ m->cgroup_root = mfree(m->cgroup_root);
}
Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
@@ -992,8 +1367,8 @@ Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
char *e;
e = strrchr(p, '/');
- if (e == p || !e)
- return NULL;
+ if (!e || e == p)
+ return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
*e = 0;
@@ -1010,9 +1385,12 @@ Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
assert(m);
- if (pid <= 1)
+ if (pid <= 0)
return NULL;
+ if (pid == 1)
+ return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
+
u = hashmap_get(m->watch_pids1, LONG_TO_PTR(pid));
if (u)
return u;
@@ -1030,7 +1408,6 @@ Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
Unit *u;
- int r;
assert(m);
assert(cgroup);
@@ -1039,15 +1416,7 @@ int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
if (!u)
return 0;
- r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
- if (r <= 0)
- return r;
-
- if (UNIT_VTABLE(u)->notify_cgroup_empty)
- UNIT_VTABLE(u)->notify_cgroup_empty(u);
-
- unit_add_to_gc_queue(u);
- return 0;
+ return unit_notify_cgroup_empty(u);
}
int unit_get_memory_current(Unit *u, uint64_t *ret) {
@@ -1060,10 +1429,13 @@ int unit_get_memory_current(Unit *u, uint64_t *ret) {
if (!u->cgroup_path)
return -ENODATA;
- if ((u->cgroup_realized_mask & CGROUP_MEMORY) == 0)
+ if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
return -ENODATA;
- r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
+ if (cg_unified() <= 0)
+ r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
+ else
+ r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
@@ -1083,7 +1455,7 @@ static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
if (!u->cgroup_path)
return -ENODATA;
- if ((u->cgroup_realized_mask & CGROUP_CPUACCT) == 0)
+ if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
return -ENODATA;
r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index 7b38d210fb..1ce21f43f2 100644
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -96,22 +96,32 @@ struct CGroupContext {
void cgroup_context_init(CGroupContext *c);
void cgroup_context_done(CGroupContext *c);
void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix);
-void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path, ManagerState state);
+void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, ManagerState state);
-CGroupControllerMask cgroup_context_get_mask(CGroupContext *c);
+CGroupMask cgroup_context_get_mask(CGroupContext *c);
void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a);
void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w);
void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b);
-CGroupControllerMask unit_get_cgroup_mask(Unit *u);
-CGroupControllerMask unit_get_siblings_mask(Unit *u);
-CGroupControllerMask unit_get_members_mask(Unit *u);
-CGroupControllerMask unit_get_target_mask(Unit *u);
+CGroupMask unit_get_own_mask(Unit *u);
+CGroupMask unit_get_siblings_mask(Unit *u);
+CGroupMask unit_get_members_mask(Unit *u);
+CGroupMask unit_get_subtree_mask(Unit *u);
+
+CGroupMask unit_get_target_mask(Unit *u);
+CGroupMask unit_get_enable_mask(Unit *u);
void unit_update_cgroup_members_masks(Unit *u);
+
+char *unit_default_cgroup_path(Unit *u);
+int unit_set_cgroup_path(Unit *u, const char *path);
+
int unit_realize_cgroup(Unit *u);
-void unit_destroy_cgroup_if_empty(Unit *u);
+void unit_release_cgroup(Unit *u);
+void unit_prune_cgroup(Unit *u);
+int unit_watch_cgroup(Unit *u);
+
int unit_attach_pids_to_cgroup(Unit *u);
int manager_setup_cgroup(Manager *m);
@@ -122,9 +132,8 @@ unsigned manager_dispatch_cgroup_queue(Manager *m);
Unit *manager_get_unit_by_cgroup(Manager *m, const char *cgroup);
Unit* manager_get_unit_by_pid(Manager *m, pid_t pid);
-pid_t unit_search_main_pid(Unit *u);
-
-int manager_notify_cgroup_empty(Manager *m, const char *group);
+int unit_search_main_pid(Unit *u, pid_t *ret);
+int unit_watch_all_pids(Unit *u);
int unit_get_memory_current(Unit *u, uint64_t *ret);
int unit_get_cpu_usage(Unit *u, nsec_t *ret);
@@ -132,5 +141,8 @@ int unit_reset_cpu_usage(Unit *u);
bool unit_cgroup_delegate(Unit *u);
+int unit_notify_cgroup_empty(Unit *u);
+int manager_notify_cgroup_empty(Manager *m, const char *group);
+
const char* cgroup_device_policy_to_string(CGroupDevicePolicy i) _const_;
CGroupDevicePolicy cgroup_device_policy_from_string(const char *s) _pure_;
diff --git a/src/core/dbus-cgroup.c b/src/core/dbus-cgroup.c
index 9dcc51f240..e8fd44e294 100644
--- a/src/core/dbus-cgroup.c
+++ b/src/core/dbus-cgroup.c
@@ -228,7 +228,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->cpu_accounting = b;
- u->cgroup_realized_mask &= ~CGROUP_CPUACCT;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_CPUACCT;
unit_write_drop_in_private(u, mode, name, b ? "CPUAccounting=yes" : "CPUAccounting=no");
}
@@ -252,7 +252,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->cpu_shares = ul;
- u->cgroup_realized_mask &= ~CGROUP_CPU;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_CPU;
unit_write_drop_in_private_format(u, mode, name, "CPUShares=%lu", ul);
}
@@ -276,7 +276,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->startup_cpu_shares = ul;
- u->cgroup_realized_mask &= ~CGROUP_CPU;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_CPU;
unit_write_drop_in_private_format(u, mode, name, "StartupCPUShares=%lu", ul);
}
@@ -294,7 +294,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->cpu_quota_per_sec_usec = u64;
- u->cgroup_realized_mask &= ~CGROUP_CPU;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_CPU;
unit_write_drop_in_private_format(u, mode, "CPUQuota", "CPUQuota=%0.f%%", (double) (c->cpu_quota_per_sec_usec / 10000));
}
@@ -309,7 +309,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->blockio_accounting = b;
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
unit_write_drop_in_private(u, mode, name, b ? "BlockIOAccounting=yes" : "BlockIOAccounting=no");
}
@@ -333,7 +333,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->blockio_weight = ul;
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
unit_write_drop_in_private_format(u, mode, name, "BlockIOWeight=%lu", ul);
}
@@ -357,7 +357,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->startup_blockio_weight = ul;
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
unit_write_drop_in_private_format(u, mode, name, "StartupBlockIOWeight=%lu", ul);
}
@@ -427,7 +427,7 @@ int bus_cgroup_set_property(
cgroup_context_free_blockio_device_bandwidth(c, a);
}
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
f = open_memstream(&buf, &size);
if (!f)
@@ -510,7 +510,7 @@ int bus_cgroup_set_property(
cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
}
- u->cgroup_realized_mask &= ~CGROUP_BLKIO;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_BLKIO;
f = open_memstream(&buf, &size);
if (!f)
@@ -535,7 +535,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->memory_accounting = b;
- u->cgroup_realized_mask &= ~CGROUP_MEMORY;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_MEMORY;
unit_write_drop_in_private(u, mode, name, b ? "MemoryAccounting=yes" : "MemoryAccounting=no");
}
@@ -550,7 +550,7 @@ int bus_cgroup_set_property(
if (mode != UNIT_CHECK) {
c->memory_limit = limit;
- u->cgroup_realized_mask &= ~CGROUP_MEMORY;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_MEMORY;
unit_write_drop_in_private_format(u, mode, name, "%s=%" PRIu64, name, limit);
}
@@ -572,7 +572,7 @@ int bus_cgroup_set_property(
char *buf;
c->device_policy = p;
- u->cgroup_realized_mask &= ~CGROUP_DEVICE;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_DEVICE;
buf = strjoina("DevicePolicy=", policy);
unit_write_drop_in_private(u, mode, name, buf);
@@ -651,7 +651,7 @@ int bus_cgroup_set_property(
cgroup_context_free_device_allow(c, c->device_allow);
}
- u->cgroup_realized_mask &= ~CGROUP_DEVICE;
+ u->cgroup_realized_mask &= ~CGROUP_MASK_DEVICE;
f = open_memstream(&buf, &size);
if (!f)
diff --git a/src/core/dbus-unit.c b/src/core/dbus-unit.c
index 1e6291e762..31016b6c4a 100644
--- a/src/core/dbus-unit.c
+++ b/src/core/dbus-unit.c
@@ -25,6 +25,7 @@
#include "cgroup-util.h"
#include "strv.h"
#include "bus-common-errors.h"
+#include "special.h"
#include "dbus.h"
#include "dbus-unit.h"
@@ -973,6 +974,8 @@ static int bus_unit_set_transient_property(
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
if (u->type == UNIT_SLICE)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
+ if (unit_has_name(u, SPECIAL_INIT_SCOPE))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
r = sd_bus_message_read(message, "s", &s);
if (r < 0)
diff --git a/src/core/execute.h b/src/core/execute.h
index 8d14fe23d0..a750246a89 100644
--- a/src/core/execute.h
+++ b/src/core/execute.h
@@ -214,7 +214,7 @@ struct ExecParameters {
bool apply_tty_stdin;
bool confirm_spawn;
bool selinux_context_net;
- CGroupControllerMask cgroup_supported;
+ CGroupMask cgroup_supported;
const char *cgroup_path;
bool cgroup_delegate;
const char *runtime_prefix;
diff --git a/src/core/manager.c b/src/core/manager.c
index 14f069ba97..c3327e37f5 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -568,7 +568,9 @@ int manager_new(ManagerRunningAs running_as, bool test_run, Manager **_m) {
m->idle_pipe[0] = m->idle_pipe[1] = m->idle_pipe[2] = m->idle_pipe[3] = -1;
- m->pin_cgroupfs_fd = m->notify_fd = m->signal_fd = m->time_change_fd = m->dev_autofs_fd = m->private_listen_fd = m->kdbus_fd = m->utab_inotify_fd = -1;
+ m->pin_cgroupfs_fd = m->notify_fd = m->signal_fd = m->time_change_fd =
+ m->dev_autofs_fd = m->private_listen_fd = m->kdbus_fd = m->utab_inotify_fd =
+ m->cgroup_inotify_fd = -1;
m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
m->ask_password_inotify_fd = -1;
@@ -2722,7 +2724,7 @@ void manager_check_finished(Manager *m) {
SET_FOREACH(u, m->startup_units, i)
if (u->cgroup_path)
- cgroup_context_apply(unit_get_cgroup_context(u), unit_get_cgroup_mask(u), u->cgroup_path, manager_state(m));
+ cgroup_context_apply(unit_get_cgroup_context(u), unit_get_own_mask(u), u->cgroup_path, manager_state(m));
}
static int create_generator_dir(Manager *m, char **generator, const char *name) {
diff --git a/src/core/manager.h b/src/core/manager.h
index 3f7fa24e58..9956cb7700 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -215,16 +215,22 @@ struct Manager {
/* Data specific to the cgroup subsystem */
Hashmap *cgroup_unit;
- CGroupControllerMask cgroup_supported;
+ CGroupMask cgroup_supported;
char *cgroup_root;
- int gc_marker;
- unsigned n_in_gc_queue;
+ /* Notifications from cgroups, when the unified hierarchy is
+ * used is done via inotify. */
+ int cgroup_inotify_fd;
+ sd_event_source *cgroup_inotify_event_source;
+ Hashmap *cgroup_inotify_wd_unit;
/* Make sure the user cannot accidentally unmount our cgroup
* file system */
int pin_cgroupfs_fd;
+ int gc_marker;
+ unsigned n_in_gc_queue;
+
/* Flags */
ManagerRunningAs running_as;
ManagerExitCode exit_code:5;
diff --git a/src/core/mount-setup.c b/src/core/mount-setup.c
index 1782d40720..c6f3569915 100644
--- a/src/core/mount-setup.c
+++ b/src/core/mount-setup.c
@@ -93,12 +93,14 @@ static const MountPoint mount_table[] = {
#endif
{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
NULL, MNT_FATAL|MNT_IN_CONTAINER },
+ { "cgroup", "/sys/fs/cgroup", "cgroup", "__DEVEL__sane_behavior", MS_NOSUID|MS_NOEXEC|MS_NODEV,
+ cg_is_unified_wanted, MNT_FATAL|MNT_IN_CONTAINER },
{ "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME,
- NULL, MNT_FATAL|MNT_IN_CONTAINER },
+ cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV,
- NULL, MNT_IN_CONTAINER },
+ cg_is_legacy_wanted, MNT_IN_CONTAINER },
{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV,
- NULL, MNT_FATAL|MNT_IN_CONTAINER },
+ cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
{ "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
NULL, MNT_NONE },
#ifdef ENABLE_EFI
@@ -217,6 +219,9 @@ int mount_cgroup_controllers(char ***join_controllers) {
_cleanup_set_free_free_ Set *controllers = NULL;
int r;
+ if (!cg_is_legacy_wanted())
+ return 0;
+
/* Mount all available cgroup controllers that are built into the kernel. */
controllers = set_new(&string_hash_ops);
diff --git a/src/core/scope.c b/src/core/scope.c
index 1e94d63561..44cd324f58 100644
--- a/src/core/scope.c
+++ b/src/core/scope.c
@@ -22,12 +22,13 @@
#include <errno.h>
#include <unistd.h>
-#include "unit.h"
-#include "scope.h"
#include "log.h"
-#include "dbus-scope.h"
+#include "strv.h"
#include "special.h"
#include "unit-name.h"
+#include "unit.h"
+#include "scope.h"
+#include "dbus-scope.h"
#include "load-dropin.h"
static const UnitActiveState state_translation_table[_SCOPE_STATE_MAX] = {
@@ -136,7 +137,9 @@ static int scope_verify(Scope *s) {
if (UNIT(s)->load_state != UNIT_LOADED)
return 0;
- if (set_isempty(UNIT(s)->pids) && UNIT(s)->manager->n_reloading <= 0) {
+ if (set_isempty(UNIT(s)->pids) &&
+ !manager_is_reloading_or_reexecuting(UNIT(s)->manager) <= 0 &&
+ !unit_has_name(UNIT(s), SPECIAL_INIT_SCOPE)) {
log_unit_error(UNIT(s), "Scope has no PIDs. Refusing.");
return -EINVAL;
}
@@ -151,7 +154,7 @@ static int scope_load(Unit *u) {
assert(s);
assert(u->load_state == UNIT_STUB);
- if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
+ if (!u->transient && !manager_is_reloading_or_reexecuting(u->manager))
return -ENOENT;
u->load_state = UNIT_LOADED;
@@ -279,6 +282,9 @@ static int scope_start(Unit *u) {
assert(s);
+ if (unit_has_name(u, SPECIAL_INIT_SCOPE))
+ return -EPERM;
+
if (s->state == SCOPE_FAILED)
return -EPERM;
@@ -289,7 +295,7 @@ static int scope_start(Unit *u) {
assert(s->state == SCOPE_DEAD);
- if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
+ if (!u->transient && !manager_is_reloading_or_reexecuting(u->manager))
return -ENOENT;
(void) unit_realize_cgroup(u);
@@ -464,6 +470,9 @@ static int scope_dispatch_timer(sd_event_source *source, usec_t usec, void *user
int scope_abandon(Scope *s) {
assert(s);
+ if (unit_has_name(UNIT(s), SPECIAL_INIT_SCOPE))
+ return -EPERM;
+
if (!IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED))
return -ESTALE;
@@ -499,6 +508,48 @@ _pure_ static const char *scope_sub_state_to_string(Unit *u) {
return scope_state_to_string(SCOPE(u)->state);
}
+static int scope_enumerate(Manager *m) {
+ Unit *u;
+ int r;
+
+ assert(m);
+
+ /* Let's unconditionally add the "init.scope" special unit
+ * that encapsulates PID 1. Note that PID 1 already is in the
+ * cgroup for this, we hence just need to allocate the object
+ * for it and that's it. */
+
+ u = manager_get_unit(m, SPECIAL_INIT_SCOPE);
+ if (!u) {
+ u = unit_new(m, sizeof(Scope));
+ if (!u)
+ return log_oom();
+
+ r = unit_add_name(u, SPECIAL_INIT_SCOPE);
+ if (r < 0) {
+ unit_free(u);
+ return log_error_errno(r, "Failed to add init.scope name");
+ }
+ }
+
+ u->transient = true;
+ u->default_dependencies = false;
+ u->no_gc = true;
+ SCOPE(u)->deserialized_state = SCOPE_RUNNING;
+ SCOPE(u)->kill_context.kill_signal = SIGRTMIN+14;
+
+ /* Prettify things, if we can. */
+ if (!u->description)
+ u->description = strdup("System and Service Manager");
+ if (!u->documentation)
+ (void) strv_extend(&u->documentation, "man:systemd(1)");
+
+ unit_add_to_load_queue(u);
+ unit_add_to_dbus_queue(u);
+
+ return 0;
+}
+
static const char* const scope_state_table[_SCOPE_STATE_MAX] = {
[SCOPE_DEAD] = "dead",
[SCOPE_RUNNING] = "running",
@@ -565,5 +616,7 @@ const UnitVTable scope_vtable = {
.bus_set_property = bus_scope_set_property,
.bus_commit_properties = bus_scope_commit_properties,
- .can_transient = true
+ .can_transient = true,
+
+ .enumerate = scope_enumerate,
};
diff --git a/src/core/service.c b/src/core/service.c
index 5a0a3aa867..292fe50de8 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -767,7 +767,7 @@ static int service_load_pid_file(Service *s, bool may_warn) {
}
static int service_search_main_pid(Service *s) {
- pid_t pid;
+ pid_t pid = 0;
int r;
assert(s);
@@ -782,9 +782,9 @@ static int service_search_main_pid(Service *s) {
assert(s->main_pid <= 0);
- pid = unit_search_main_pid(UNIT(s));
- if (pid <= 0)
- return -ENOENT;
+ r = unit_search_main_pid(UNIT(s), &pid);
+ if (r < 0)
+ return r;
log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid);
r = service_set_main_pid(s, pid);
@@ -860,7 +860,7 @@ static void service_set_state(Service *s, ServiceState state) {
/* For the inactive states unit_notify() will trim the cgroup,
* but for exit we have to do that ourselves... */
if (state == SERVICE_EXITED && UNIT(s)->manager->n_reloading <= 0)
- unit_destroy_cgroup_if_empty(UNIT(s));
+ unit_prune_cgroup(UNIT(s));
/* For remain_after_exit services, let's see if we can "release" the
* hold on the console, since unit_notify() only does that in case of
@@ -2644,7 +2644,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
break;
}
} else
- service_search_main_pid(s);
+ (void) service_search_main_pid(s);
service_enter_start_post(s);
break;
@@ -2666,7 +2666,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
break;
}
} else
- service_search_main_pid(s);
+ (void) service_search_main_pid(s);
service_enter_running(s, SERVICE_SUCCESS);
break;
@@ -2674,7 +2674,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
case SERVICE_RELOAD:
if (f == SERVICE_SUCCESS) {
service_load_pid_file(s, true);
- service_search_main_pid(s);
+ (void) service_search_main_pid(s);
}
s->reload_result = f;
diff --git a/src/core/slice.c b/src/core/slice.c
index 7442d23391..b414462066 100644
--- a/src/core/slice.c
+++ b/src/core/slice.c
@@ -21,12 +21,13 @@
#include <errno.h>
-#include "unit.h"
-#include "slice.h"
#include "log.h"
-#include "dbus-slice.h"
+#include "strv.h"
#include "special.h"
#include "unit-name.h"
+#include "unit.h"
+#include "slice.h"
+#include "dbus-slice.h"
static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = {
[SLICE_DEAD] = UNIT_INACTIVE,
@@ -252,6 +253,40 @@ _pure_ static const char *slice_sub_state_to_string(Unit *u) {
return slice_state_to_string(SLICE(u)->state);
}
+static int slice_enumerate(Manager *m) {
+ Unit *u;
+ int r;
+
+ assert(m);
+
+ u = manager_get_unit(m, SPECIAL_ROOT_SLICE);
+ if (!u) {
+ u = unit_new(m, sizeof(Slice));
+ if (!u)
+ return log_oom();
+
+ r = unit_add_name(u, SPECIAL_ROOT_SLICE);
+ if (r < 0) {
+ unit_free(u);
+ return log_error_errno(r, "Failed to add -.slice name");
+ }
+ }
+
+ u->default_dependencies = false;
+ u->no_gc = true;
+ SLICE(u)->deserialized_state = SLICE_ACTIVE;
+
+ if (!u->description)
+ u->description = strdup("Root Slice");
+ if (!u->documentation)
+ (void) strv_extend(&u->documentation, "man:systemd.special(7)");
+
+ unit_add_to_load_queue(u);
+ unit_add_to_dbus_queue(u);
+
+ return 0;
+}
+
static const char* const slice_state_table[_SLICE_STATE_MAX] = {
[SLICE_DEAD] = "dead",
[SLICE_ACTIVE] = "active"
@@ -293,6 +328,8 @@ const UnitVTable slice_vtable = {
.bus_set_property = bus_slice_set_property,
.bus_commit_properties = bus_slice_commit_properties,
+ .enumerate = slice_enumerate,
+
.status_message_formats = {
.finished_start_job = {
[JOB_DONE] = "Created slice %s.",
diff --git a/src/core/unit.c b/src/core/unit.c
index 34d3adcd3b..8c07c6140d 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -91,6 +91,7 @@ Unit *unit_new(Manager *m, size_t size) {
u->unit_file_state = _UNIT_FILE_STATE_INVALID;
u->unit_file_preset = -1;
u->on_failure_job_mode = JOB_REPLACE;
+ u->cgroup_inotify_wd = -1;
RATELIMIT_INIT(u->auto_stop_ratelimit, 10 * USEC_PER_SEC, 16);
@@ -525,10 +526,7 @@ void unit_free(Unit *u) {
if (u->in_cgroup_queue)
LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u);
- if (u->cgroup_path) {
- hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
- free(u->cgroup_path);
- }
+ unit_release_cgroup(u);
manager_update_failed_units(u->manager, u, false);
set_remove(u->manager->startup_units, u);
@@ -1801,7 +1799,7 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_su
/* Make sure the cgroup is always removed when we become inactive */
if (UNIT_IS_INACTIVE_OR_FAILED(ns))
- unit_destroy_cgroup_if_empty(u);
+ unit_prune_cgroup(u);
/* Note that this doesn't apply to RemainAfterExit services exiting
* successfully, since there's no change of state in that case. Which is
@@ -2028,70 +2026,7 @@ void unit_unwatch_all_pids(Unit *u) {
while (!set_isempty(u->pids))
unit_unwatch_pid(u, PTR_TO_LONG(set_first(u->pids)));
- set_free(u->pids);
- u->pids = NULL;
-}
-
-static int unit_watch_pids_in_path(Unit *u, const char *path) {
- _cleanup_closedir_ DIR *d = NULL;
- _cleanup_fclose_ FILE *f = NULL;
- int ret = 0, r;
-
- assert(u);
- assert(path);
-
- /* Adds all PIDs from a specific cgroup path to the set of PIDs we watch. */
-
- r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
- if (r >= 0) {
- pid_t pid;
-
- while ((r = cg_read_pid(f, &pid)) > 0) {
- r = unit_watch_pid(u, pid);
- if (r < 0 && ret >= 0)
- ret = r;
- }
- if (r < 0 && ret >= 0)
- ret = r;
-
- } else if (ret >= 0)
- ret = r;
-
- r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
- if (r >= 0) {
- char *fn;
-
- while ((r = cg_read_subgroup(d, &fn)) > 0) {
- _cleanup_free_ char *p = NULL;
-
- p = strjoin(path, "/", fn, NULL);
- free(fn);
-
- if (!p)
- return -ENOMEM;
-
- r = unit_watch_pids_in_path(u, p);
- if (r < 0 && ret >= 0)
- ret = r;
- }
- if (r < 0 && ret >= 0)
- ret = r;
-
- } else if (ret >= 0)
- ret = r;
-
- return ret;
-}
-
-int unit_watch_all_pids(Unit *u) {
- assert(u);
-
- /* Adds all PIDs from our cgroup to the set of PIDs we watch */
-
- if (!u->cgroup_path)
- return -ENOENT;
-
- return unit_watch_pids_in_path(u, u->cgroup_path);
+ u->pids = set_free(u->pids);
}
void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2) {
@@ -2400,31 +2335,6 @@ char *unit_dbus_path(Unit *u) {
return unit_dbus_path_from_name(u->id);
}
-char *unit_default_cgroup_path(Unit *u) {
- _cleanup_free_ char *escaped = NULL, *slice = NULL;
- int r;
-
- assert(u);
-
- if (unit_has_name(u, SPECIAL_ROOT_SLICE))
- return strdup(u->manager->cgroup_root);
-
- if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
- r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
- if (r < 0)
- return NULL;
- }
-
- escaped = cg_escape(u->id);
- if (!escaped)
- return NULL;
-
- if (slice)
- return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL);
- else
- return strjoin(u->manager->cgroup_root, "/", escaped, NULL);
-}
-
int unit_set_slice(Unit *u, Unit *slice) {
assert(u);
assert(slice);
@@ -2447,6 +2357,10 @@ int unit_set_slice(Unit *u, Unit *slice) {
if (slice->type != UNIT_SLICE)
return -EINVAL;
+ if (unit_has_name(u, SPECIAL_INIT_SCOPE) &&
+ !unit_has_name(slice, SPECIAL_ROOT_SLICE))
+ return -EPERM;
+
if (UNIT_DEREF(u->slice) == slice)
return 0;
@@ -2495,7 +2409,7 @@ int unit_set_default_slice(Unit *u) {
slice_name = b;
} else
slice_name =
- u->manager->running_as == MANAGER_SYSTEM
+ u->manager->running_as == MANAGER_SYSTEM && !unit_has_name(u, SPECIAL_INIT_SCOPE)
? SPECIAL_SYSTEM_SLICE
: SPECIAL_ROOT_SLICE;
@@ -2704,40 +2618,6 @@ void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
fprintf(f, "%s=%s\n", key, value);
}
-static int unit_set_cgroup_path(Unit *u, const char *path) {
- _cleanup_free_ char *p = NULL;
- int r;
-
- assert(u);
-
- if (path) {
- p = strdup(path);
- if (!p)
- return -ENOMEM;
- } else
- p = NULL;
-
- if (streq_ptr(u->cgroup_path, p))
- return 0;
-
- if (p) {
- r = hashmap_put(u->manager->cgroup_unit, p, u);
- if (r < 0)
- return r;
- }
-
- if (u->cgroup_path) {
- log_unit_debug(u, "Changing cgroup path from %s to %s.", u->cgroup_path, strna(p));
- hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
- free(u->cgroup_path);
- }
-
- u->cgroup_path = p;
- p = NULL;
-
- return 0;
-}
-
int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
ExecRuntime **rt = NULL;
size_t offset;
@@ -2868,6 +2748,8 @@ int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
if (r < 0)
log_unit_debug_errno(u, r, "Failed to set cgroup path %s, ignoring: %m", v);
+ (void) unit_watch_cgroup(u);
+
continue;
} else if (streq(l, "cgroup-realized")) {
int b;
@@ -3600,18 +3482,22 @@ int unit_kill_context(
} else if (r > 0) {
- /* FIXME: For now, we will not wait for the
- * cgroup members to die if we are running in
- * a container or if this is a delegation
- * unit, simply because cgroup notification is
- * unreliable in these cases. It doesn't work
- * at all in containers, and outside of
- * containers it can be confused easily by
- * left-over directories in the cgroup --
- * which however should not exist in
- * non-delegated units. */
-
- if (detect_container(NULL) == 0 && !unit_cgroup_delegate(u))
+ /* FIXME: For now, on the legacy hierarchy, we
+ * will not wait for the cgroup members to die
+ * if we are running in a container or if this
+ * is a delegation unit, simply because cgroup
+ * notification is unreliable in these
+ * cases. It doesn't work at all in
+ * containers, and outside of containers it
+ * can be confused easily by left-over
+ * directories in the cgroup -- which however
+ * should not exist in non-delegated units. On
+ * the unified hierarchy that's different,
+ * there we get proper events. Hence rely on
+ * them.*/
+
+ if (cg_unified() > 0 ||
+ (detect_container(NULL) == 0 && !unit_cgroup_delegate(u)))
wait_for_exit = true;
if (c->send_sighup && k != KILL_KILL) {
diff --git a/src/core/unit.h b/src/core/unit.h
index bc26653247..3c7684411b 100644
--- a/src/core/unit.h
+++ b/src/core/unit.h
@@ -184,9 +184,10 @@ struct Unit {
/* Counterparts in the cgroup filesystem */
char *cgroup_path;
- CGroupControllerMask cgroup_realized_mask;
- CGroupControllerMask cgroup_subtree_mask;
- CGroupControllerMask cgroup_members_mask;
+ CGroupMask cgroup_realized_mask;
+ CGroupMask cgroup_subtree_mask;
+ CGroupMask cgroup_members_mask;
+ int cgroup_inotify_wd;
/* How to start OnFailure units */
JobMode on_failure_job_mode;
@@ -522,7 +523,6 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_su
int unit_watch_pid(Unit *u, pid_t pid);
void unit_unwatch_pid(Unit *u, pid_t pid);
-int unit_watch_all_pids(Unit *u);
void unit_unwatch_all_pids(Unit *u);
void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2);
@@ -567,8 +567,6 @@ bool unit_active_or_pending(Unit *u);
int unit_add_default_target_dependency(Unit *u, Unit *target);
-char *unit_default_cgroup_path(Unit *u);
-
void unit_start_on_failure(Unit *u);
void unit_trigger_notify(Unit *u);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-18 13:46:05 +0000