--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <limits.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/epoll.h>
+#include <sys/stat.h>
+#include <sys/swap.h>
+
+#include "unit.h"
+#include "swap.h"
+#include "load-fragment.h"
+#include "load-dropin.h"
+#include "unit-name.h"
+#include "dbus-swap.h"
+
+static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
+ [SWAP_DEAD] = UNIT_INACTIVE,
+ [SWAP_ACTIVE] = UNIT_ACTIVE,
+ [SWAP_MAINTAINANCE] = UNIT_INACTIVE
+};
+
+static int swap_verify(Swap *s) {
+ bool b;
+ char *e;
+
+ if (UNIT(s)->meta.load_state != UNIT_LOADED)
+ return 0;
+
+ if (!(e = unit_name_from_path(s->what, ".swap")))
+ return -ENOMEM;
+
+ b = unit_has_name(UNIT(s), e);
+ free(e);
+
+ if (!b) {
+ log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->meta.id);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int swap_add_target_links(Swap *s) {
+ Manager *m = s->meta.manager;
+ Unit *tu;
+ int r;
+
+ r = manager_load_unit(m, SPECIAL_SWAP_TARGET, NULL, &tu);
+ if (r < 0)
+ return r;
+
+ if (!s->no_auto && (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_load(Unit *u) {
+ int r;
+ Swap *s = SWAP(u);
+
+ assert(s);
+ assert(u->meta.load_state == UNIT_STUB);
+
+ /* Load a .swap file */
+ if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
+ return r;
+
+ if (u->meta.load_state == UNIT_LOADED) {
+ if (!s->what)
+ if (!(s->what = unit_name_to_path(u->meta.id)))
+ return -ENOMEM;
+
+ path_kill_slashes(s->what);
+
+ if ((r = mount_add_node_links(u, s->what)) < 0)
+ return r;
+
+ if (!path_startswith(s->what, "/dev/"))
+ if ((r = mount_add_path_links(u, s->what, true)) < 0)
+ return r;
+
+ if ((r = swap_add_target_links(s)) < 0)
+ return r;
+ }
+
+ return swap_verify(s);
+}
+
+int swap_add_one(Manager *m, const char *what, bool no_auto, int prio, bool from_proc_swaps) {
+ Unit *u;
+ char *e;
+ bool delete;
+ int r;
+
+ if (!(e = unit_name_from_path(what, ".swap")))
+ return -ENOMEM;
+
+ if (!(u = manager_get_unit(m, e))) {
+ delete = true;
+
+ if (!(u = unit_new(m))) {
+ free(e);
+ return -ENOMEM;
+ }
+
+ r = unit_add_name(u, e);
+ free(e);
+
+ if (r < 0)
+ goto fail;
+
+ if (!(SWAP(u)->what = strdup(what))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ if ((r = unit_set_description(u, what)) < 0)
+ goto fail;
+
+ unit_add_to_load_queue(u);
+
+ SWAP(u)->from_proc_swaps_only = from_proc_swaps;
+ } else {
+ if (SWAP(u)->from_proc_swaps_only && !from_proc_swaps)
+ SWAP(u)->from_proc_swaps_only = false;
+
+ delete = false;
+ free(e);
+ }
+
+ if (!from_proc_swaps)
+ SWAP(u)->no_auto = no_auto;
+ else
+ SWAP(u)->found_in_proc_swaps = true;
+
+ SWAP(u)->priority = prio;
+
+ return 0;
+
+fail:
+ if (delete)
+ unit_free(u);
+
+ return 0;
+}
+
+static void swap_set_state(Swap *s, SwapState state) {
+ SwapState old_state;
+ assert(s);
+
+ old_state = s->state;
+ s->state = state;
+
+ if (state != old_state)
+ log_debug("%s changed %s -> %s",
+ UNIT(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]);
+}
+
+static int swap_coldplug(Unit *u) {
+ Swap *s = SWAP(u);
+ SwapState new_state = SWAP_DEAD;
+
+ assert(s);
+ assert(s->state == SWAP_DEAD);
+
+ if (s->deserialized_state != s->state)
+ new_state = s->deserialized_state;
+ else if (s->found_in_proc_swaps)
+ new_state = SWAP_ACTIVE;
+
+ if (new_state != s->state)
+ swap_set_state(s, s->deserialized_state);
+
+ return 0;
+}
+
+static void swap_dump(Unit *u, FILE *f, const char *prefix) {
+ Swap *s = SWAP(u);
+
+ assert(s);
+
+ fprintf(f,
+ "%sAutomount State: %s\n"
+ "%sWhat: %s\n"
+ "%sPriority: %i\n"
+ "%sNoAuto: %s\n",
+ prefix, swap_state_to_string(s->state),
+ prefix, s->what,
+ prefix, s->priority,
+ prefix, yes_no(s->no_auto));
+}
+
+static void swap_enter_dead(Swap *s, bool success) {
+ assert(s);
+
+ swap_set_state(s, success ? SWAP_MAINTAINANCE : SWAP_DEAD);
+}
+
+static int swap_start(Unit *u) {
+ Swap *s = SWAP(u);
+ int r;
+
+ assert(s);
+
+ assert(s->state == SWAP_DEAD || s->state == SWAP_MAINTAINANCE);
+
+ r = swapon(s->what, (s->priority << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK);
+
+ if (r < 0 && errno != EBUSY) {
+ r = -errno;
+ swap_enter_dead(s, false);
+ return r;
+ }
+
+ swap_set_state(s, SWAP_ACTIVE);
+ return 0;
+}
+
+static int swap_stop(Unit *u) {
+ Swap *s = SWAP(u);
+ int r;
+
+ assert(s);
+
+ assert(s->state == SWAP_ACTIVE);
+
+ r = swapoff(s->what);
+ swap_enter_dead(s, r >= 0 || errno == EINVAL);
+
+ return 0;
+}
+
+static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
+ Swap *s = SWAP(u);
+
+ assert(s);
+ assert(f);
+ assert(fds);
+
+ unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
+
+ return 0;
+}
+
+static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
+ Swap *s = SWAP(u);
+
+ assert(s);
+ assert(fds);
+
+ if (streq(key, "state")) {
+ SwapState state;
+
+ if ((state = swap_state_from_string(value)) < 0)
+ log_debug("Failed to parse state value %s", value);
+ else
+ s->deserialized_state = state;
+ } else
+ log_debug("Unknown serialization key '%s'", key);
+
+ return 0;
+}
+
+static UnitActiveState swap_active_state(Unit *u) {
+ assert(u);
+
+ return state_translation_table[SWAP(u)->state];
+}
+
+static const char *swap_sub_state_to_string(Unit *u) {
+ assert(u);
+
+ return swap_state_to_string(SWAP(u)->state);
+}
+
+static bool swap_check_gc(Unit *u) {
+ Swap *s = SWAP(u);
+
+ assert(s);
+
+ return !s->from_proc_swaps_only || s->found_in_proc_swaps;
+}
+
+static int swap_load_proc_swaps(Manager *m) {
+ Meta *meta;
+
+ rewind(m->proc_swaps);
+ fscanf(m->proc_self_mountinfo, "%*s %*s %*s %*s %*s\n");
+
+ for (;;) {
+ char *dev = NULL, *d;
+ int prio = 0, k;
+
+ k = fscanf(m->proc_self_mountinfo,
+ "%ms " /* device/file */
+ "%*s " /* type of swap */
+ "%*s " /* swap size */
+ "%*s " /* used */
+ "%d\n", /* priority */
+ &dev, &prio);
+
+ if (k != 2) {
+ if (k == EOF)
+ k = 0;
+
+ free(dev);
+ return -EBADMSG;
+ }
+ if (!(d = cunescape(dev))) {
+ free(dev);
+ k = -ENOMEM;
+ return k;
+ }
+
+ k = swap_add_one(m, d, false, prio, true);
+ free(dev);
+ free(d);
+
+ if (k < 0)
+ return k;
+ }
+
+ LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) {
+ Swap *s = (Swap*) meta;
+
+ if (s->state != SWAP_DEAD && s->state != SWAP_ACTIVE)
+ continue;
+
+ if ((s->state == SWAP_DEAD && !s->found_in_proc_swaps) ||
+ (s->state == SWAP_ACTIVE && s->found_in_proc_swaps))
+ continue;
+
+ swap_set_state(s, s->found_in_proc_swaps ? SWAP_ACTIVE : SWAP_DEAD);
+
+ /* Reset the flags for later calls */
+ s->found_in_proc_swaps = false;
+ }
+}
+
+static void swap_shutdown(Manager *m) {
+ assert(m);
+
+ if (m->proc_swaps) {
+ 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);
+
+static int swap_enumerate(Manager *m) {
+ int r;
+ assert(m);
+
+ if (!m->proc_swaps &&
+ !(m->proc_swaps = fopen("/proc/swaps", "er")))
+ return -errno;
+
+ if ((r = swap_load_proc_swaps(m)) < 0)
+ swap_shutdown(m);
+
+ return r;
+}
+
+const UnitVTable swap_vtable = {
+ .suffix = ".swap",
+
+ .no_alias = true,
+ .no_instances = true,
+
+ .load = swap_load,
+
+ .coldplug = swap_coldplug,
+
+ .dump = swap_dump,
+
+ .start = swap_start,
+ .stop = swap_stop,
+
+ .serialize = swap_serialize,
+ .deserialize_item = swap_deserialize_item,
+
+ .active_state = swap_active_state,
+ .sub_state_to_string = swap_sub_state_to_string,
+
+ .check_gc = swap_check_gc,
+
+ .bus_message_handler = bus_swap_message_handler,
+
+ .shutdown = swap_shutdown,
+
+ .enumerate = swap_enumerate
+};
~ianmdlvl / elogind.git / blobdiff