***/
#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 <libudev.h>
#include "unit.h"
#include "swap.h"
-#include "load-fragment.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"
#include "path-util.h"
#include "virt.h"
#include "udev-util.h"
+#include "fstab-util.h"
static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
[SWAP_DEAD] = UNIT_INACTIVE,
return 0;
fail:
- log_unit_warning(e, "Failed to load swap unit: %s", strerror(-r));
+ log_unit_warning_errno(e, r, "Failed to load swap unit: %m");
if (delete && u)
unit_free(u);
static void swap_set_state(Swap *s, SwapState state) {
SwapState old_state;
+ Swap *other;
assert(s);
swap_state_to_string(state));
unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
+
+ /* If there other units for the same device node have a job
+ queued it might be worth checking again if it is runnable
+ now. This is necessary, since swap_start() refuses
+ operation with EAGAIN if there's already another job for
+ the same device node queued. */
+ LIST_FOREACH_OTHERS(same_devnode, other, s)
+ if (UNIT(other)->job)
+ job_add_to_run_queue(UNIT(other)->job);
}
static int swap_coldplug(Unit *u) {
fail:
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
-
return r;
}
return;
fail:
- log_unit_warning(UNIT(s)->id,
- "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
-
+ log_unit_warning_errno(UNIT(s)->id, r, "%s failed to kill processes: %m", UNIT(s)->id);
swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
}
-static int mount_find_pri(const char *options, int *ret) {
- const char *opt;
- char *end;
- unsigned long r;
-
- assert(ret);
-
- if (!options)
- return 0;
-
- opt = mount_test_option(options, "pri");
- if (!opt)
- return 0;
-
- opt += strlen("pri");
- if (*opt != '=')
- return -EINVAL;
-
- errno = 0;
- r = strtoul(opt + 1, &end, 10);
- if (errno > 0)
- return -errno;
-
- if (end == opt + 1 || (*end != ',' && *end != 0))
- return -EINVAL;
-
- *ret = (int) r;
- return 1;
-}
-
-static int mount_find_discard(const char *options, char **ret) {
- const char *opt;
- char *ans;
- size_t len;
-
- assert(ret);
-
- if (!options)
- return 0;
-
- opt = mount_test_option(options, "discard");
- if (!opt)
- return 0;
-
- opt += strlen("discard");
- if (*opt == ',' || *opt == '\0')
- ans = strdup("all");
- else {
- if (*opt != '=')
- return -EINVAL;
-
- len = strcspn(opt + 1, ",");
- if (len == 0)
- return -EINVAL;
-
- ans = strndup(opt + 1, len);
- }
-
- if (!ans)
- return -ENOMEM;
-
- *ret = ans;
- return 1;
-}
-
static void swap_enter_activating(Swap *s) {
_cleanup_free_ char *discard = NULL;
int r, priority = -1;
s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
if (s->from_fragment) {
- mount_find_discard(s->parameters_fragment.options, &discard);
+ fstab_filter_options(s->parameters_fragment.options, "discard\0",
+ NULL, &discard, NULL);
priority = s->parameters_fragment.priority;
if (priority < 0)
- mount_find_pri(s->parameters_fragment.options, &priority);
+ fstab_find_pri(s->parameters_fragment.options, &priority);
}
r = exec_command_set(s->control_command, "/sbin/swapon", NULL);
if (streq(discard, "all"))
discard_arg = "--discard";
else
- discard_arg = strappenda("--discard=", discard);
+ discard_arg = strjoina("--discard=", discard);
r = exec_command_append(s->control_command, discard_arg, NULL);
if (r < 0)
return;
fail:
- log_unit_warning(UNIT(s)->id,
- "%s failed to run 'swapon' task: %s",
- UNIT(s)->id, strerror(-r));
+ log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'swapon' task: %m", UNIT(s)->id);
swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
}
return;
fail:
- log_unit_warning(UNIT(s)->id,
- "%s failed to run 'swapoff' task: %s",
- UNIT(s)->id, strerror(-r));
+ log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run 'swapoff' task: %m", UNIT(s)->id);
swap_enter_active(s, SWAP_FAILURE_RESOURCES);
}
static int swap_start(Unit *u) {
- Swap *s = SWAP(u);
+ Swap *s = SWAP(u), *other;
assert(s);
if (detect_container(NULL) > 0)
return -EPERM;
+ /* If there's a job for another swap unit for the same node
+ * running, then let's not dispatch this one for now, and wait
+ * until that other job has finished. */
+ LIST_FOREACH_OTHERS(same_devnode, other, s)
+ if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING)
+ return -EAGAIN;
+
s->result = SWAP_SUCCESS;
swap_enter_activating(s);
- return 0;
+ return 1;
}
static int swap_stop(Unit *u) {
return -EPERM;
swap_enter_deactivating(s);
- return 0;
+ return 1;
}
static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
r = swap_load_proc_swaps(m, true);
if (r < 0) {
- log_error_errno(-r, "Failed to reread /proc/swaps: %m");
+ log_error_errno(r, "Failed to reread /proc/swaps: %m");
/* Reset flags, just in case, for late calls */
LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
if (s->from_fragment)
return NULL;
- LIST_FOREACH_AFTER(same_devnode, other, s)
- if (other->from_fragment)
- return UNIT(other);
-
- LIST_FOREACH_BEFORE(same_devnode, other, s)
+ LIST_FOREACH_OTHERS(same_devnode, other, s)
if (other->from_fragment)
return UNIT(other);
if (!set)
return -ENOMEM;
- LIST_FOREACH_AFTER(same_devnode, other, s) {
- r = set_put(set, other);
- if (r < 0)
- goto fail;
- }
-
- LIST_FOREACH_BEFORE(same_devnode, other, s) {
+ LIST_FOREACH_OTHERS(same_devnode, other, s) {
r = set_put(set, other);
if (r < 0)
goto fail;
return 1;
}
+static bool swap_supported(Manager *m) {
+ static int supported = -1;
+
+ /* If swap support is not available in the kernel, or we are
+ * running in a container we don't support swap units, and any
+ * attempts to starting one should fail immediately. */
+
+ if (supported < 0)
+ supported =
+ access("/proc/swaps", F_OK) >= 0 &&
+ detect_container(NULL) <= 0;
+
+ return supported;
+}
+
static const char* const swap_state_table[_SWAP_STATE_MAX] = {
[SWAP_DEAD] = "dead",
[SWAP_ACTIVATING] = "activating",
.enumerate = swap_enumerate,
.shutdown = swap_shutdown,
+ .supported = swap_supported,
.status_message_formats = {
.starting_stopping = {
~ianmdlvl / elogind.git / blobdiff