-/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
#include <sys/epoll.h>
#include <sys/stat.h>
#include <sys/swap.h>
+#include <libudev.h>
#include "unit.h"
#include "swap.h"
#include "load-dropin.h"
#include "unit-name.h"
#include "dbus-swap.h"
+#include "special.h"
+#include "bus-errors.h"
+#include "exit-status.h"
+#include "def.h"
static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
[SWAP_DEAD] = UNIT_INACTIVE,
+ [SWAP_ACTIVATING] = UNIT_ACTIVATING,
[SWAP_ACTIVE] = UNIT_ACTIVE,
- [SWAP_MAINTAINANCE] = UNIT_INACTIVE
+ [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
+ [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
+ [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
+ [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
+ [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
+ [SWAP_FAILED] = UNIT_FAILED
};
-static void swap_init(Unit *u) {
+static void swap_unset_proc_swaps(Swap *s) {
+ Swap *first;
+
+ assert(s);
+
+ if (!s->parameters_proc_swaps.what)
+ return;
+
+ /* Remove this unit from the chain of swaps which share the
+ * same kernel swap device. */
+
+ first = hashmap_get(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
+ LIST_REMOVE(Swap, same_proc_swaps, first, s);
+
+ if (first)
+ hashmap_remove_and_replace(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first);
+ else
+ hashmap_remove(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what);
+
+ free(s->parameters_proc_swaps.what);
+ s->parameters_proc_swaps.what = NULL;
+}
+
+ static void swap_init(Unit *u) {
Swap *s = SWAP(u);
assert(s);
assert(s->meta.load_state == UNIT_STUB);
+ s->timeout_usec = DEFAULT_TIMEOUT_USEC;
+
+ exec_context_init(&s->exec_context);
+ s->exec_context.std_output = EXEC_OUTPUT_KMSG;
+
s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
+
+ s->timer_watch.type = WATCH_INVALID;
+
+ s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
+
+ s->meta.ignore_on_isolate = true;
+}
+
+static void swap_unwatch_control_pid(Swap *s) {
+ assert(s);
+
+ if (s->control_pid <= 0)
+ return;
+
+ unit_unwatch_pid(UNIT(s), s->control_pid);
+ s->control_pid = 0;
}
static void swap_done(Unit *u) {
assert(s);
+ swap_unset_proc_swaps(s);
+
free(s->what);
+ s->what = NULL;
+
free(s->parameters_etc_fstab.what);
- free(s->parameters_proc_swaps.what);
free(s->parameters_fragment.what);
+ s->parameters_etc_fstab.what = s->parameters_fragment.what = NULL;
+
+ exec_context_done(&s->exec_context);
+ exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
+ s->control_command = NULL;
+
+ swap_unwatch_control_pid(s);
+
+ unit_unwatch_timer(u, &s->timer_watch);
}
int swap_add_one_mount_link(Swap *s, Mount *m) {
if (!path_startswith(s->what, m->where))
return 0;
- if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(s), true)) < 0)
- return r;
-
- if ((r = unit_add_dependency(UNIT(s), UNIT_REQUIRES, UNIT(m), true)) < 0)
+ if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
return r;
return 0;
assert(s);
- LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
+ LIST_FOREACH(units_by_type, other, s->meta.manager->units_by_type[UNIT_MOUNT])
if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0)
return r;
else
return 0;
- if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, &tu)) < 0)
+ if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0)
return r;
- if (!p->noauto && p->handle && s->meta.manager->running_as != MANAGER_SESSION)
+ if (!p->noauto &&
+ !p->nofail &&
+ (p->handle || s->meta.manager->swap_auto) &&
+ s->from_etc_fstab &&
+ s->meta.manager->running_as == MANAGER_SYSTEM)
if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0)
return r;
return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true);
}
+static int swap_add_device_links(Swap *s) {
+ SwapParameters *p;
+
+ assert(s);
+
+ if (!s->what)
+ return 0;
+
+ if (s->from_fragment)
+ p = &s->parameters_fragment;
+ else if (s->from_etc_fstab)
+ p = &s->parameters_etc_fstab;
+ else
+ return 0;
+
+ if (is_device_path(s->what))
+ return unit_add_node_link(UNIT(s), s->what,
+ !p->noauto && p->nofail &&
+ s->meta.manager->running_as == MANAGER_SYSTEM);
+ else
+ /* File based swap devices need to be ordered after
+ * remount-rootfs.service, since they might need a
+ * writable file system. */
+ return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true);
+}
+
+static int swap_add_default_dependencies(Swap *s) {
+ int r;
+
+ assert(s);
+
+ if (s->meta.manager->running_as == MANAGER_SYSTEM) {
+
+ if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
+ return r;
+ }
+
+ return 0;
+}
+
static int swap_verify(Swap *s) {
bool b;
char *e;
- if (UNIT(s)->meta.load_state != UNIT_LOADED)
+ if (s->meta.load_state != UNIT_LOADED)
return 0;
if (!(e = unit_name_from_path(s->what, ".swap")))
free(e);
if (!b) {
- log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->meta.id);
+ log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s->meta.id);
+ return -EINVAL;
+ }
+
+ if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
+ log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id);
return -EINVAL;
}
return r;
if (u->meta.load_state == UNIT_LOADED) {
+ if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
+ return r;
if (s->meta.fragment_path)
s->from_fragment = true;
if ((r = unit_set_description(u, s->what)) < 0)
return r;
- if ((r = unit_add_node_link(u, s->what,
- (u->meta.manager->running_as == MANAGER_INIT ||
- u->meta.manager->running_as == MANAGER_SYSTEM))) < 0)
+ if ((r = swap_add_device_links(s)) < 0)
return r;
if ((r = swap_add_mount_links(s)) < 0)
if ((r = swap_add_target_links(s)) < 0)
return r;
- }
- return swap_verify(s);
-}
-
-static int swap_find(Manager *m, const char *what, Unit **_u) {
- Unit *u;
- char *e;
-
- assert(m);
- assert(what);
- assert(_u);
-
- /* /proc/swaps and /etc/fstab might refer to this device by
- * different names (e.g. one by uuid, the other by the kernel
- * name), we hence need to look for all aliases we are aware
- * of for this device */
-
- if (!(e = unit_name_from_path(what, ".device")))
- return -ENOMEM;
-
- u = manager_get_unit(m, e);
- free(e);
-
- if (u) {
- Iterator i;
- const char *d;
-
- SET_FOREACH(d, u->meta.names, i) {
- Unit *k;
-
- if (!(e = unit_name_change_suffix(d, ".swap")))
- return -ENOMEM;
-
- k = manager_get_unit(m, e);
- free(e);
+ if ((r = unit_add_default_cgroups(u)) < 0)
+ return r;
- if (k) {
- *_u = k;
- return 0;
- }
- }
+ if (s->meta.default_dependencies)
+ if ((r = swap_add_default_dependencies(s)) < 0)
+ return r;
}
- *_u = NULL;
- return 0;
+ return swap_verify(s);
}
int swap_add_one(
Manager *m,
const char *what,
+ const char *what_proc_swaps,
int priority,
bool noauto,
+ bool nofail,
bool handle,
- bool from_proc_swaps) {
+ bool set_flags) {
+
Unit *u = NULL;
- char *e = NULL, *w = NULL;
- bool delete;
+ char *e = NULL, *wp = NULL;
+ bool delete = false;
int r;
SwapParameters *p;
if (!(e = unit_name_from_path(what, ".swap")))
return -ENOMEM;
- if (!(u = manager_get_unit(m, e)))
- if ((r = swap_find(m, what, &u)) < 0)
- goto fail;
+ u = manager_get_unit(m, e);
+
+ if (what_proc_swaps &&
+ u &&
+ SWAP(u)->from_proc_swaps &&
+ !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps))
+ return -EEXIST;
if (!u) {
delete = true;
free(e);
return -ENOMEM;
}
+
+ if ((r = unit_add_name(u, e)) < 0)
+ goto fail;
+
+ if (!(SWAP(u)->what = strdup(what))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ unit_add_to_load_queue(u);
} else
delete = false;
- if ((r = unit_add_name(u, e)) < 0)
- goto fail;
+ if (what_proc_swaps) {
+ Swap *first;
- if (!(w = strdup(what))) {
- r = -ENOMEM;
- goto fail;
- }
-
- if (from_proc_swaps) {
p = &SWAP(u)->parameters_proc_swaps;
+
+ if (!p->what) {
+ if (!(wp = strdup(what_proc_swaps))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ if (!m->swaps_by_proc_swaps)
+ if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ free(p->what);
+ p->what = wp;
+
+ first = hashmap_get(m->swaps_by_proc_swaps, wp);
+ LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u));
+
+ if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0)
+ goto fail;
+ }
+
+ if (set_flags) {
+ SWAP(u)->is_active = true;
+ SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
+ }
+
SWAP(u)->from_proc_swaps = true;
+
} else {
p = &SWAP(u)->parameters_etc_fstab;
+
+ if (!(wp = strdup(what))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ free(p->what);
+ p->what = wp;
+
SWAP(u)->from_etc_fstab = true;
}
- free(p->what);
- p->what = w;
-
p->priority = priority;
p->noauto = noauto;
+ p->nofail = nofail;
p->handle = handle;
- if (delete)
- unit_add_to_load_queue(u);
-
unit_add_to_dbus_queue(u);
free(e);
return 0;
fail:
- free(w);
+ log_warning("Failed to load swap unit: %s", strerror(-r));
+
+ free(wp);
free(e);
if (delete && u)
return r;
}
+static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) {
+ struct stat st;
+ int r = 0, k;
+
+ assert(m);
+
+ if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) {
+ struct udev_device *d;
+ const char *dn;
+ struct udev_list_entry *item = NULL, *first = NULL;
+
+ /* So this is a proper swap device. Create swap units
+ * for all names this swap device is known under */
+
+ if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev)))
+ return -ENOMEM;
+
+ if ((dn = udev_device_get_devnode(d)))
+ r = swap_add_one(m, dn, device, prio, false, false, false, set_flags);
+
+ /* Add additional units for all symlinks */
+ first = udev_device_get_devlinks_list_entry(d);
+ udev_list_entry_foreach(item, first) {
+ const char *p;
+
+ /* Don't bother with the /dev/block links */
+ p = udev_list_entry_get_name(item);
+
+ if (path_startswith(p, "/dev/block/"))
+ continue;
+
+ if (stat(p, &st) >= 0)
+ if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d))
+ continue;
+
+ if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0)
+ r = k;
+ }
+
+ udev_device_unref(d);
+ }
+
+ if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 0)
+ r = k;
+
+ return r;
+}
+
static void swap_set_state(Swap *s, SwapState state) {
SwapState old_state;
+
assert(s);
old_state = s->state;
s->state = state;
+ if (state != SWAP_ACTIVATING &&
+ state != SWAP_ACTIVATING_SIGTERM &&
+ state != SWAP_ACTIVATING_SIGKILL &&
+ state != SWAP_DEACTIVATING &&
+ state != SWAP_DEACTIVATING_SIGTERM &&
+ state != SWAP_DEACTIVATING_SIGKILL) {
+ unit_unwatch_timer(UNIT(s), &s->timer_watch);
+ swap_unwatch_control_pid(s);
+ s->control_command = NULL;
+ s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
+ }
+
if (state != old_state)
log_debug("%s changed %s -> %s",
- UNIT(s)->meta.id,
+ s->meta.id,
swap_state_to_string(old_state),
swap_state_to_string(state));
- unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
+ unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
}
static int swap_coldplug(Unit *u) {
Swap *s = SWAP(u);
SwapState new_state = SWAP_DEAD;
+ int r;
assert(s);
assert(s->state == SWAP_DEAD);
else if (s->from_proc_swaps)
new_state = SWAP_ACTIVE;
- if (new_state != s->state)
+ if (new_state != s->state) {
+
+ if (new_state == SWAP_ACTIVATING ||
+ new_state == SWAP_ACTIVATING_SIGTERM ||
+ new_state == SWAP_ACTIVATING_SIGKILL ||
+ new_state == SWAP_DEACTIVATING ||
+ new_state == SWAP_DEACTIVATING_SIGTERM ||
+ new_state == SWAP_DEACTIVATING_SIGKILL) {
+
+ if (s->control_pid <= 0)
+ return -EBADMSG;
+
+ if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
+ return r;
+
+ if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+ return r;
+ }
+
swap_set_state(s, new_state);
+ }
return 0;
}
"%sWhat: %s\n"
"%sPriority: %i\n"
"%sNoAuto: %s\n"
+ "%sNoFail: %s\n"
"%sHandle: %s\n"
"%sFrom /etc/fstab: %s\n"
"%sFrom /proc/swaps: %s\n"
prefix, s->what,
prefix, p->priority,
prefix, yes_no(p->noauto),
+ prefix, yes_no(p->nofail),
prefix, yes_no(p->handle),
prefix, yes_no(s->from_etc_fstab),
prefix, yes_no(s->from_proc_swaps),
prefix, yes_no(s->from_fragment));
+
+ if (s->control_pid > 0)
+ fprintf(f,
+ "%sControl PID: %lu\n",
+ prefix, (unsigned long) s->control_pid);
+
+ exec_context_dump(&s->exec_context, f, prefix);
+}
+
+static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
+ pid_t pid;
+ int r;
+
+ assert(s);
+ assert(c);
+ assert(_pid);
+
+ if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+ goto fail;
+
+ if ((r = exec_spawn(c,
+ NULL,
+ &s->exec_context,
+ NULL, 0,
+ s->meta.manager->environment,
+ true,
+ true,
+ true,
+ s->meta.manager->confirm_spawn,
+ s->meta.cgroup_bondings,
+ &pid)) < 0)
+ goto fail;
+
+ if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
+ /* FIXME: we need to do something here */
+ goto fail;
+
+ *_pid = pid;
+
+ return 0;
+
+fail:
+ unit_unwatch_timer(UNIT(s), &s->timer_watch);
+
+ return r;
}
static void swap_enter_dead(Swap *s, bool success) {
assert(s);
- swap_set_state(s, success ? SWAP_MAINTAINANCE : SWAP_DEAD);
+ if (!success)
+ s->failure = true;
+
+ swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD);
}
-static int swap_start(Unit *u) {
- Swap *s = SWAP(u);
- int priority = -1;
+static void swap_enter_active(Swap *s, bool success) {
+ assert(s);
+
+ if (!success)
+ s->failure = true;
+
+ swap_set_state(s, SWAP_ACTIVE);
+}
+
+static void swap_enter_signal(Swap *s, SwapState state, bool success) {
int r;
+ Set *pid_set = NULL;
+ bool wait_for_exit = false;
+
+ assert(s);
+
+ if (!success)
+ s->failure = true;
+
+ if (s->exec_context.kill_mode != KILL_NONE) {
+ int sig = (state == SWAP_ACTIVATING_SIGTERM ||
+ state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
+
+ if (s->control_pid > 0) {
+ if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
+
+ log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
+ else
+ wait_for_exit = true;
+ }
+
+ if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
+
+ if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ /* Exclude the control pid from being killed via the cgroup */
+ if (s->control_pid > 0)
+ if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
+ goto fail;
+
+ if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
+ if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
+ log_warning("Failed to kill control group: %s", strerror(-r));
+ } else if (r > 0)
+ wait_for_exit = true;
+
+ set_free(pid_set);
+ pid_set = NULL;
+ }
+ }
+
+ if (wait_for_exit) {
+ if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
+ goto fail;
+
+ swap_set_state(s, state);
+ } else
+ swap_enter_dead(s, true);
+
+ return;
+
+fail:
+ log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
+
+ swap_enter_dead(s, false);
+
+ if (pid_set)
+ set_free(pid_set);
+}
+
+static void swap_enter_activating(Swap *s) {
+ int r, priority;
assert(s);
- assert(s->state == SWAP_DEAD || s->state == SWAP_MAINTAINANCE);
+
+ s->control_command_id = SWAP_EXEC_ACTIVATE;
+ s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
if (s->from_fragment)
priority = s->parameters_fragment.priority;
else if (s->from_etc_fstab)
priority = s->parameters_etc_fstab.priority;
+ else
+ priority = -1;
- r = swapon(s->what, (priority << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK);
+ if (priority >= 0) {
+ char p[LINE_MAX];
- if (r < 0 && errno != EBUSY) {
- r = -errno;
- swap_enter_dead(s, false);
- return r;
- }
+ snprintf(p, sizeof(p), "%i", priority);
+ char_array_0(p);
- swap_set_state(s, SWAP_ACTIVE);
+ r = exec_command_set(
+ s->control_command,
+ "/sbin/swapon",
+ "-p",
+ p,
+ s->what,
+ NULL);
+ } else
+ r = exec_command_set(
+ s->control_command,
+ "/sbin/swapon",
+ s->what,
+ NULL);
+
+ if (r < 0)
+ goto fail;
+
+ swap_unwatch_control_pid(s);
+
+ if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0)
+ goto fail;
+
+ swap_set_state(s, SWAP_ACTIVATING);
+
+ return;
+
+fail:
+ log_warning("%s failed to run 'swapon' task: %s", s->meta.id, strerror(-r));
+ swap_enter_dead(s, false);
+}
+
+static void swap_enter_deactivating(Swap *s, bool success) {
+ int r;
+
+ assert(s);
+
+ if (!success)
+ s->failure = true;
+
+ s->control_command_id = SWAP_EXEC_DEACTIVATE;
+ s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
+
+ if ((r = exec_command_set(
+ s->control_command,
+ "/sbin/swapoff",
+ s->what,
+ NULL)) < 0)
+ goto fail;
+
+ swap_unwatch_control_pid(s);
+
+ if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0)
+ goto fail;
+
+ swap_set_state(s, SWAP_DEACTIVATING);
+
+ return;
+
+fail:
+ log_warning("%s failed to run 'swapoff' task: %s", s->meta.id, strerror(-r));
+ swap_enter_active(s, false);
+}
+
+static int swap_start(Unit *u) {
+ Swap *s = SWAP(u);
+
+ assert(s);
+
+ /* We cannot fulfill this request right now, try again later
+ * please! */
+
+ if (s->state == SWAP_DEACTIVATING ||
+ s->state == SWAP_DEACTIVATING_SIGTERM ||
+ s->state == SWAP_DEACTIVATING_SIGKILL ||
+ s->state == SWAP_ACTIVATING_SIGTERM ||
+ s->state == SWAP_ACTIVATING_SIGKILL)
+ return -EAGAIN;
+
+ if (s->state == SWAP_ACTIVATING)
+ return 0;
+
+ assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
+
+ s->failure = false;
+ swap_enter_activating(s);
return 0;
}
static int swap_stop(Unit *u) {
Swap *s = SWAP(u);
- int r;
assert(s);
- assert(s->state == SWAP_ACTIVE);
+ if (s->state == SWAP_DEACTIVATING ||
+ s->state == SWAP_DEACTIVATING_SIGTERM ||
+ s->state == SWAP_DEACTIVATING_SIGKILL ||
+ s->state == SWAP_ACTIVATING_SIGTERM ||
+ s->state == SWAP_ACTIVATING_SIGKILL)
+ return 0;
- r = swapoff(s->what);
- swap_enter_dead(s, r >= 0 || errno == EINVAL);
+ assert(s->state == SWAP_ACTIVATING ||
+ s->state == SWAP_ACTIVE);
+ swap_enter_deactivating(s, true);
return 0;
}
assert(fds);
unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
+ unit_serialize_item(u, f, "failure", yes_no(s->failure));
+
+ if (s->control_pid > 0)
+ unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
+
+ if (s->control_command_id >= 0)
+ unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
return 0;
}
log_debug("Failed to parse state value %s", value);
else
s->deserialized_state = state;
+ } else if (streq(key, "failure")) {
+ int b;
+
+ if ((b = parse_boolean(value)) < 0)
+ log_debug("Failed to parse failure value %s", value);
+ else
+ s->failure = b || s->failure;
+
+ } else if (streq(key, "control-pid")) {
+ pid_t pid;
+
+ if (parse_pid(value, &pid) < 0)
+ log_debug("Failed to parse control-pid value %s", value);
+ else
+ s->control_pid = pid;
+
+ } else if (streq(key, "control-command")) {
+ SwapExecCommand id;
+
+ if ((id = swap_exec_command_from_string(value)) < 0)
+ log_debug("Failed to parse exec-command value %s", value);
+ else {
+ s->control_command_id = id;
+ s->control_command = s->exec_command + id;
+ }
+
} else
log_debug("Unknown serialization key '%s'", key);
return s->from_etc_fstab || s->from_proc_swaps;
}
-static int swap_load_proc_swaps(Manager *m) {
+static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
+ Swap *s = SWAP(u);
+ bool success;
+
+ assert(s);
+ assert(pid >= 0);
+
+ if (pid != s->control_pid)
+ return;
+
+ s->control_pid = 0;
+
+ success = is_clean_exit(code, status);
+ s->failure = s->failure || !success;
+
+ if (s->control_command) {
+ exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
+ s->control_command = NULL;
+ s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
+ }
+
+ log_full(success ? LOG_DEBUG : LOG_NOTICE,
+ "%s swap process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
+
+ switch (s->state) {
+
+ case SWAP_ACTIVATING:
+ case SWAP_ACTIVATING_SIGTERM:
+ case SWAP_ACTIVATING_SIGKILL:
+
+ if (success)
+ swap_enter_active(s, true);
+ else
+ swap_enter_dead(s, false);
+ break;
+
+ case SWAP_DEACTIVATING:
+ case SWAP_DEACTIVATING_SIGKILL:
+ case SWAP_DEACTIVATING_SIGTERM:
+
+ if (success)
+ swap_enter_dead(s, true);
+ else
+ swap_enter_dead(s, false);
+ break;
+
+ default:
+ assert_not_reached("Uh, control process died at wrong time.");
+ }
+
+ /* Notify clients about changed exit status */
+ unit_add_to_dbus_queue(u);
+
+ /* Request a reload of /proc/swaps, so that following units
+ * can follow our state change */
+ u->meta.manager->request_reload = true;
+}
+
+static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
+ Swap *s = SWAP(u);
+
+ assert(s);
+ assert(elapsed == 1);
+ assert(w == &s->timer_watch);
+
+ switch (s->state) {
+
+ case SWAP_ACTIVATING:
+ log_warning("%s activation timed out. Stopping.", u->meta.id);
+ swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false);
+ break;
+
+ case SWAP_DEACTIVATING:
+ log_warning("%s deactivation timed out. Stopping.", u->meta.id);
+ swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false);
+ break;
+
+ case SWAP_ACTIVATING_SIGTERM:
+ if (s->exec_context.send_sigkill) {
+ log_warning("%s activation timed out. Killing.", u->meta.id);
+ swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false);
+ } else {
+ log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
+ swap_enter_dead(s, false);
+ }
+ break;
+
+ case SWAP_DEACTIVATING_SIGTERM:
+ if (s->exec_context.send_sigkill) {
+ log_warning("%s deactivation timed out. Killing.", u->meta.id);
+ swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false);
+ } else {
+ log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
+ swap_enter_dead(s, false);
+ }
+ break;
+
+ case SWAP_ACTIVATING_SIGKILL:
+ case SWAP_DEACTIVATING_SIGKILL:
+ log_warning("%s swap process still around after SIGKILL. Ignoring.", u->meta.id);
+ swap_enter_dead(s, false);
+ break;
+
+ default:
+ assert_not_reached("Timeout at wrong time.");
+ }
+}
+
+static int swap_load_proc_swaps(Manager *m, bool set_flags) {
+ unsigned i;
+ int r = 0;
+
+ assert(m);
+
rewind(m->proc_swaps);
(void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
- for (;;) {
+ for (i = 1;; i++) {
char *dev = NULL, *d;
int prio = 0, k;
if ((k = fscanf(m->proc_swaps,
- "%ms " /* device/file */
- "%*s " /* type of swap */
- "%*s " /* swap size */
- "%*s " /* used */
+ "%ms " /* device/file */
+ "%*s " /* type of swap */
+ "%*s " /* swap size */
+ "%*s " /* used */
"%i\n", /* priority */
&dev, &prio)) != 2) {
if (k == EOF)
break;
+ log_warning("Failed to parse /proc/swaps:%u.", i);
free(dev);
- return -EBADMSG;
+ continue;
}
d = cunescape(dev);
if (!d)
return -ENOMEM;
- k = swap_add_one(m, d, prio, false, false, true);
+ k = swap_process_new_swap(m, d, prio, set_flags);
free(d);
if (k < 0)
- return k;
+ r = k;
}
- return 0;
+ return r;
+}
+
+int swap_dispatch_reload(Manager *m) {
+ /* This function should go as soon as the kernel properly notifies us */
+
+ if (_likely_(!m->request_reload))
+ return 0;
+
+ m->request_reload = false;
+
+ return swap_fd_event(m, EPOLLPRI);
+}
+
+int swap_fd_event(Manager *m, int events) {
+ Meta *meta;
+ int r;
+
+ assert(m);
+ assert(events & EPOLLPRI);
+
+ if ((r = swap_load_proc_swaps(m, true)) < 0) {
+ log_error("Failed to reread /proc/swaps: %s", strerror(-r));
+
+ /* Reset flags, just in case, for late calls */
+ LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_SWAP]) {
+ Swap *swap = (Swap*) meta;
+
+ swap->is_active = swap->just_activated = false;
+ }
+
+ return 0;
+ }
+
+ manager_dispatch_load_queue(m);
+
+ LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_SWAP]) {
+ Swap *swap = (Swap*) meta;
+
+ if (!swap->is_active) {
+ /* This has just been deactivated */
+
+ swap->from_proc_swaps = false;
+ swap_unset_proc_swaps(swap);
+
+ switch (swap->state) {
+
+ case SWAP_ACTIVE:
+ swap_enter_dead(swap, true);
+ break;
+
+ default:
+ swap_set_state(swap, swap->state);
+ break;
+ }
+
+ } else if (swap->just_activated) {
+
+ /* New swap entry */
+
+ switch (swap->state) {
+
+ case SWAP_DEAD:
+ case SWAP_FAILED:
+ swap_enter_active(swap, true);
+ break;
+
+ default:
+ /* Nothing really changed, but let's
+ * issue an notification call
+ * nonetheless, in case somebody is
+ * waiting for this. */
+ swap_set_state(swap, swap->state);
+ break;
+ }
+ }
+
+ /* Reset the flags for later calls */
+ swap->is_active = swap->just_activated = false;
+ }
+
+ return 1;
+}
+
+static Unit *swap_following(Unit *u) {
+ Swap *s = SWAP(u);
+ Swap *other, *first = NULL;
+
+ assert(s);
+
+ if (streq_ptr(s->what, s->parameters_proc_swaps.what))
+ return NULL;
+
+ /* Make everybody follow the unit that's named after the swap
+ * device in the kernel */
+
+ LIST_FOREACH_AFTER(same_proc_swaps, other, s)
+ if (streq_ptr(other->what, other->parameters_proc_swaps.what))
+ return UNIT(other);
+
+ LIST_FOREACH_BEFORE(same_proc_swaps, other, s) {
+ if (streq_ptr(other->what, other->parameters_proc_swaps.what))
+ return UNIT(other);
+
+ first = other;
+ }
+
+ return UNIT(first);
+}
+
+static int swap_following_set(Unit *u, Set **_set) {
+ Swap *s = SWAP(u);
+ Swap *other;
+ Set *set;
+ int r;
+
+ assert(s);
+ assert(_set);
+
+ if (LIST_JUST_US(same_proc_swaps, s)) {
+ *_set = NULL;
+ return 0;
+ }
+
+ if (!(set = set_new(NULL, NULL)))
+ return -ENOMEM;
+
+ LIST_FOREACH_AFTER(same_proc_swaps, other, s)
+ if ((r = set_put(set, other)) < 0)
+ goto fail;
+
+ LIST_FOREACH_BEFORE(same_proc_swaps, other, s)
+ if ((r = set_put(set, other)) < 0)
+ goto fail;
+
+ *_set = set;
+ return 1;
+
+fail:
+ set_free(set);
+ return r;
}
static void swap_shutdown(Manager *m) {
fclose(m->proc_swaps);
m->proc_swaps = NULL;
}
-}
-static const char* const swap_state_table[_SWAP_STATE_MAX] = {
- [SWAP_DEAD] = "dead",
- [SWAP_ACTIVE] = "active",
- [SWAP_MAINTAINANCE] = "maintainance"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
+ hashmap_free(m->swaps_by_proc_swaps);
+ m->swaps_by_proc_swaps = NULL;
+}
static int swap_enumerate(Manager *m) {
int r;
+ struct epoll_event ev;
assert(m);
- if (!m->proc_swaps)
+ if (!m->proc_swaps) {
if (!(m->proc_swaps = fopen("/proc/swaps", "re")))
+ return (errno == ENOENT) ? 0 : -errno;
+
+ m->swap_watch.type = WATCH_SWAP;
+ m->swap_watch.fd = fileno(m->proc_swaps);
+
+ zero(ev);
+ ev.events = EPOLLPRI;
+ ev.data.ptr = &m->swap_watch;
+
+ if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0)
return -errno;
+ }
- if ((r = swap_load_proc_swaps(m)) < 0)
+ /* We rely on mount.c to load /etc/fstab for us */
+
+ if ((r = swap_load_proc_swaps(m, false)) < 0)
swap_shutdown(m);
return r;
}
+static void swap_reset_failed(Unit *u) {
+ Swap *s = SWAP(u);
+
+ assert(s);
+
+ if (s->state == SWAP_FAILED)
+ swap_set_state(s, SWAP_DEAD);
+
+ s->failure = false;
+}
+
+static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
+ Swap *s = SWAP(u);
+ int r = 0;
+ Set *pid_set = NULL;
+
+ assert(s);
+
+ if (who == KILL_MAIN) {
+ dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes");
+ return -EINVAL;
+ }
+
+ if (s->control_pid <= 0 && who == KILL_CONTROL) {
+ dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
+ return -ENOENT;
+ }
+
+ if (who == KILL_CONTROL || who == KILL_ALL)
+ if (s->control_pid > 0)
+ if (kill(s->control_pid, signo) < 0)
+ r = -errno;
+
+ if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
+ int q;
+
+ if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
+ return -ENOMEM;
+
+ /* Exclude the control pid from being killed via the cgroup */
+ if (s->control_pid > 0)
+ if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
+ r = q;
+ goto finish;
+ }
+
+ if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0)
+ if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
+ r = q;
+ }
+
+finish:
+ if (pid_set)
+ set_free(pid_set);
+
+ return r;
+}
+
+static const char* const swap_state_table[_SWAP_STATE_MAX] = {
+ [SWAP_DEAD] = "dead",
+ [SWAP_ACTIVATING] = "activating",
+ [SWAP_ACTIVE] = "active",
+ [SWAP_DEACTIVATING] = "deactivating",
+ [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
+ [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
+ [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
+ [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
+ [SWAP_FAILED] = "failed"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
+
+static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
+ [SWAP_EXEC_ACTIVATE] = "ExecActivate",
+ [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
+
const UnitVTable swap_vtable = {
.suffix = ".swap",
+ .no_alias = true,
.no_instances = true,
- .no_isolate = true,
+ .show_status = true,
.init = swap_init,
.load = swap_load,
.start = swap_start,
.stop = swap_stop,
+ .kill = swap_kill,
+
.serialize = swap_serialize,
.deserialize_item = swap_deserialize_item,
.check_gc = swap_check_gc,
+ .sigchld_event = swap_sigchld_event,
+ .timer_event = swap_timer_event,
+
+ .reset_failed = swap_reset_failed,
+
+ .bus_interface = "org.freedesktop.systemd1.Swap",
.bus_message_handler = bus_swap_message_handler,
+ .bus_invalidating_properties = bus_swap_invalidating_properties,
+
+ .following = swap_following,
+ .following_set = swap_following_set,
.enumerate = swap_enumerate,
.shutdown = swap_shutdown
~ianmdlvl / elogind.git / blobdiff