1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/epoll.h>
32 #include "load-fragment.h"
33 #include "load-dropin.h"
34 #include "unit-name.h"
35 #include "dbus-swap.h"
38 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
39 [SWAP_DEAD] = UNIT_INACTIVE,
40 [SWAP_ACTIVE] = UNIT_ACTIVE,
41 [SWAP_MAINTENANCE] = UNIT_MAINTENANCE
44 static void swap_init(Unit *u) {
48 assert(s->meta.load_state == UNIT_STUB);
50 s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
53 static void swap_done(Unit *u) {
59 free(s->parameters_etc_fstab.what);
60 free(s->parameters_proc_swaps.what);
61 free(s->parameters_fragment.what);
64 int swap_add_one_mount_link(Swap *s, Mount *m) {
70 if (s->meta.load_state != UNIT_LOADED ||
71 m->meta.load_state != UNIT_LOADED)
74 if (is_device_path(s->what))
77 if (!path_startswith(s->what, m->where))
80 if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
86 static int swap_add_mount_links(Swap *s) {
92 LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
93 if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0)
99 static int swap_add_target_links(Swap *s) {
106 if (s->from_fragment)
107 p = &s->parameters_fragment;
108 else if (s->from_etc_fstab)
109 p = &s->parameters_etc_fstab;
113 if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0)
116 if (!p->noauto && p->handle && s->meta.manager->running_as == MANAGER_SYSTEM)
117 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0)
120 return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true);
123 static int swap_verify(Swap *s) {
127 if (s->meta.load_state != UNIT_LOADED)
130 if (!(e = unit_name_from_path(s->what, ".swap")))
133 b = unit_has_name(UNIT(s), e);
137 log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s->meta.id);
144 static int swap_load(Unit *u) {
149 assert(u->meta.load_state == UNIT_STUB);
151 /* Load a .swap file */
152 if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
155 if (u->meta.load_state == UNIT_LOADED) {
157 if (s->meta.fragment_path)
158 s->from_fragment = true;
161 if (s->parameters_fragment.what)
162 s->what = strdup(s->parameters_fragment.what);
163 else if (s->parameters_etc_fstab.what)
164 s->what = strdup(s->parameters_etc_fstab.what);
165 else if (s->parameters_proc_swaps.what)
166 s->what = strdup(s->parameters_proc_swaps.what);
168 s->what = unit_name_to_path(u->meta.id);
174 path_kill_slashes(s->what);
176 if (!s->meta.description)
177 if ((r = unit_set_description(u, s->what)) < 0)
180 if ((r = unit_add_node_link(u, s->what, u->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
183 if ((r = swap_add_mount_links(s)) < 0)
186 if ((r = swap_add_target_links(s)) < 0)
190 return swap_verify(s);
193 static int swap_find(Manager *m, const char *what, Unit **_u) {
201 /* /proc/swaps and /etc/fstab might refer to this device by
202 * different names (e.g. one by uuid, the other by the kernel
203 * name), we hence need to look for all aliases we are aware
204 * of for this device */
206 if (!(e = unit_name_from_path(what, ".device")))
209 u = manager_get_unit(m, e);
216 SET_FOREACH(d, u->meta.names, i) {
219 if (!(e = unit_name_change_suffix(d, ".swap")))
222 k = manager_get_unit(m, e);
242 bool from_proc_swaps) {
244 char *e = NULL, *w = NULL;
252 if (!(e = unit_name_from_path(what, ".swap")))
255 if (!(u = manager_get_unit(m, e)))
256 if ((r = swap_find(m, what, &u)) < 0)
262 if (!(u = unit_new(m))) {
269 if ((r = unit_add_name(u, e)) < 0)
272 if (!(w = strdup(what))) {
277 if (from_proc_swaps) {
278 p = &SWAP(u)->parameters_proc_swaps;
279 SWAP(u)->from_proc_swaps = true;
281 p = &SWAP(u)->parameters_etc_fstab;
282 SWAP(u)->from_etc_fstab = true;
288 p->priority = priority;
293 unit_add_to_load_queue(u);
295 unit_add_to_dbus_queue(u);
311 static void swap_set_state(Swap *s, SwapState state) {
315 old_state = s->state;
318 if (state != old_state)
319 log_debug("%s changed %s -> %s",
321 swap_state_to_string(old_state),
322 swap_state_to_string(state));
324 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
327 static int swap_coldplug(Unit *u) {
329 SwapState new_state = SWAP_DEAD;
332 assert(s->state == SWAP_DEAD);
334 if (s->deserialized_state != s->state)
335 new_state = s->deserialized_state;
336 else if (s->from_proc_swaps)
337 new_state = SWAP_ACTIVE;
339 if (new_state != s->state)
340 swap_set_state(s, new_state);
345 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
352 if (s->from_proc_swaps)
353 p = &s->parameters_proc_swaps;
354 else if (s->from_fragment)
355 p = &s->parameters_fragment;
357 p = &s->parameters_etc_fstab;
365 "%sFrom /etc/fstab: %s\n"
366 "%sFrom /proc/swaps: %s\n"
367 "%sFrom fragment: %s\n",
368 prefix, swap_state_to_string(s->state),
371 prefix, yes_no(p->noauto),
372 prefix, yes_no(p->handle),
373 prefix, yes_no(s->from_etc_fstab),
374 prefix, yes_no(s->from_proc_swaps),
375 prefix, yes_no(s->from_fragment));
378 static void swap_enter_dead(Swap *s, bool success) {
381 swap_set_state(s, success ? SWAP_MAINTENANCE : SWAP_DEAD);
384 static int swap_start(Unit *u) {
390 assert(s->state == SWAP_DEAD || s->state == SWAP_MAINTENANCE);
392 if (s->from_fragment)
393 priority = s->parameters_fragment.priority;
394 else if (s->from_etc_fstab)
395 priority = s->parameters_etc_fstab.priority;
397 r = swapon(s->what, (priority << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK);
399 if (r < 0 && errno != EBUSY) {
401 swap_enter_dead(s, false);
405 swap_set_state(s, SWAP_ACTIVE);
409 static int swap_stop(Unit *u) {
415 assert(s->state == SWAP_ACTIVE);
417 r = swapoff(s->what);
418 swap_enter_dead(s, r >= 0 || errno == EINVAL);
423 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
430 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
435 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
441 if (streq(key, "state")) {
444 if ((state = swap_state_from_string(value)) < 0)
445 log_debug("Failed to parse state value %s", value);
447 s->deserialized_state = state;
449 log_debug("Unknown serialization key '%s'", key);
454 static UnitActiveState swap_active_state(Unit *u) {
457 return state_translation_table[SWAP(u)->state];
460 static const char *swap_sub_state_to_string(Unit *u) {
463 return swap_state_to_string(SWAP(u)->state);
466 static bool swap_check_gc(Unit *u) {
471 return s->from_etc_fstab || s->from_proc_swaps;
474 static int swap_load_proc_swaps(Manager *m) {
475 rewind(m->proc_swaps);
477 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
480 char *dev = NULL, *d;
483 if ((k = fscanf(m->proc_swaps,
484 "%ms " /* device/file */
485 "%*s " /* type of swap */
486 "%*s " /* swap size */
488 "%i\n", /* priority */
489 &dev, &prio)) != 2) {
504 k = swap_add_one(m, d, prio, false, false, true);
514 static void swap_shutdown(Manager *m) {
518 fclose(m->proc_swaps);
519 m->proc_swaps = NULL;
523 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
524 [SWAP_DEAD] = "dead",
525 [SWAP_ACTIVE] = "active",
526 [SWAP_MAINTENANCE] = "maintenance"
529 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
531 static int swap_enumerate(Manager *m) {
536 if (!(m->proc_swaps = fopen("/proc/swaps", "re")))
539 if ((r = swap_load_proc_swaps(m)) < 0)
545 const UnitVTable swap_vtable = {
548 .no_instances = true,
556 .coldplug = swap_coldplug,
563 .serialize = swap_serialize,
564 .deserialize_item = swap_deserialize_item,
566 .active_state = swap_active_state,
567 .sub_state_to_string = swap_sub_state_to_string,
569 .check_gc = swap_check_gc,
571 .bus_message_handler = bus_swap_message_handler,
573 .enumerate = swap_enumerate,
574 .shutdown = swap_shutdown