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"
37 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
38 [SWAP_DEAD] = UNIT_INACTIVE,
39 [SWAP_ACTIVE] = UNIT_ACTIVE,
40 [SWAP_MAINTAINANCE] = UNIT_INACTIVE
43 static int swap_verify(Swap *s) {
47 if (UNIT(s)->meta.load_state != UNIT_LOADED)
50 if (!(e = unit_name_from_path(s->what, ".swap")))
53 b = unit_has_name(UNIT(s), e);
57 log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->meta.id);
63 static int swap_add_target_links(Swap *s) {
64 Manager *m = s->meta.manager;
68 r = manager_load_unit(m, SPECIAL_SWAP_TARGET, NULL, &tu);
72 if (!s->no_auto && (r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0)
75 return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true);
78 static int swap_load(Unit *u) {
83 assert(u->meta.load_state == UNIT_STUB);
85 /* Load a .swap file */
86 if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
89 if (u->meta.load_state == UNIT_LOADED) {
91 if (!(s->what = unit_name_to_path(u->meta.id)))
94 path_kill_slashes(s->what);
96 if ((r = mount_add_node_links(u, s->what)) < 0)
99 if (!path_startswith(s->what, "/dev/"))
100 if ((r = mount_add_path_links(u, s->what, true)) < 0)
103 if ((r = swap_add_target_links(s)) < 0)
107 return swap_verify(s);
110 int swap_add_one(Manager *m, const char *what, bool no_auto, int prio, bool from_proc_swaps) {
116 if (!(e = unit_name_from_path(what, ".swap")))
119 if (!(u = manager_get_unit(m, e))) {
122 if (!(u = unit_new(m))) {
127 r = unit_add_name(u, e);
133 if (!(SWAP(u)->what = strdup(what))) {
138 if ((r = unit_set_description(u, what)) < 0)
141 unit_add_to_load_queue(u);
143 SWAP(u)->from_proc_swaps_only = from_proc_swaps;
145 if (SWAP(u)->from_proc_swaps_only && !from_proc_swaps)
146 SWAP(u)->from_proc_swaps_only = false;
152 if (!from_proc_swaps)
153 SWAP(u)->no_auto = no_auto;
155 SWAP(u)->found_in_proc_swaps = true;
157 SWAP(u)->priority = prio;
168 static void swap_set_state(Swap *s, SwapState state) {
172 old_state = s->state;
175 if (state != old_state)
176 log_debug("%s changed %s -> %s",
178 swap_state_to_string(old_state),
179 swap_state_to_string(state));
181 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
184 static int swap_coldplug(Unit *u) {
186 SwapState new_state = SWAP_DEAD;
189 assert(s->state == SWAP_DEAD);
191 if (s->deserialized_state != s->state)
192 new_state = s->deserialized_state;
193 else if (s->found_in_proc_swaps)
194 new_state = SWAP_ACTIVE;
196 if (new_state != s->state)
197 swap_set_state(s, s->deserialized_state);
202 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
208 "%sAutomount State: %s\n"
212 prefix, swap_state_to_string(s->state),
215 prefix, yes_no(s->no_auto));
218 static void swap_enter_dead(Swap *s, bool success) {
221 swap_set_state(s, success ? SWAP_MAINTAINANCE : SWAP_DEAD);
224 static int swap_start(Unit *u) {
230 assert(s->state == SWAP_DEAD || s->state == SWAP_MAINTAINANCE);
232 r = swapon(s->what, (s->priority << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK);
234 if (r < 0 && errno != EBUSY) {
236 swap_enter_dead(s, false);
240 swap_set_state(s, SWAP_ACTIVE);
244 static int swap_stop(Unit *u) {
250 assert(s->state == SWAP_ACTIVE);
252 r = swapoff(s->what);
253 swap_enter_dead(s, r >= 0 || errno == EINVAL);
258 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
265 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
270 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
276 if (streq(key, "state")) {
279 if ((state = swap_state_from_string(value)) < 0)
280 log_debug("Failed to parse state value %s", value);
282 s->deserialized_state = state;
284 log_debug("Unknown serialization key '%s'", key);
289 static UnitActiveState swap_active_state(Unit *u) {
292 return state_translation_table[SWAP(u)->state];
295 static const char *swap_sub_state_to_string(Unit *u) {
298 return swap_state_to_string(SWAP(u)->state);
301 static bool swap_check_gc(Unit *u) {
306 return !s->from_proc_swaps_only || s->found_in_proc_swaps;
309 static int swap_load_proc_swaps(Manager *m) {
312 rewind(m->proc_swaps);
313 fscanf(m->proc_self_mountinfo, "%*s %*s %*s %*s %*s\n");
316 char *dev = NULL, *d;
319 k = fscanf(m->proc_self_mountinfo,
320 "%ms " /* device/file */
321 "%*s " /* type of swap */
322 "%*s " /* swap size */
324 "%d\n", /* priority */
334 if (!(d = cunescape(dev))) {
340 k = swap_add_one(m, d, false, prio, true);
348 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) {
349 Swap *s = (Swap*) meta;
351 if (s->state != SWAP_DEAD && s->state != SWAP_ACTIVE)
354 if ((s->state == SWAP_DEAD && !s->found_in_proc_swaps) ||
355 (s->state == SWAP_ACTIVE && s->found_in_proc_swaps))
358 swap_set_state(s, s->found_in_proc_swaps ? SWAP_ACTIVE : SWAP_DEAD);
360 /* Reset the flags for later calls */
361 s->found_in_proc_swaps = false;
365 static void swap_shutdown(Manager *m) {
369 fclose(m->proc_swaps);
370 m->proc_swaps = NULL;
374 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
375 [SWAP_DEAD] = "dead",
376 [SWAP_ACTIVE] = "active",
377 [SWAP_MAINTAINANCE] = "maintainance"
380 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
382 static int swap_enumerate(Manager *m) {
386 if (!m->proc_swaps &&
387 !(m->proc_swaps = fopen("/proc/swaps", "er")))
390 if ((r = swap_load_proc_swaps(m)) < 0)
396 const UnitVTable swap_vtable = {
400 .no_instances = true,
404 .coldplug = swap_coldplug,
411 .serialize = swap_serialize,
412 .deserialize_item = swap_deserialize_item,
414 .active_state = swap_active_state,
415 .sub_state_to_string = swap_sub_state_to_string,
417 .check_gc = swap_check_gc,
419 .bus_message_handler = bus_swap_message_handler,
421 .shutdown = swap_shutdown,
423 .enumerate = swap_enumerate