X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fcore%2Fswap.c;h=1add722bf13db58cf4869f63380cebd90c493bf8;hb=f1f00dbb7f3741b30d4a26b1a8b65ec46ff1fde3;hp=e0627db965ab10f5f47b03f3723445c72931d1c3;hpb=09812eb764b440651f3ff4cb5d37bd343f800560;p=elogind.git diff --git a/src/core/swap.c b/src/core/swap.c index e0627db96..1add722bf 100644 --- a/src/core/swap.c +++ b/src/core/swap.c @@ -77,7 +77,7 @@ static int swap_set_devnode(Swap *s, const char *devnode) { assert(s); - r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, string_hash_func, string_compare_func); + r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops); if (r < 0) return r; @@ -118,11 +118,8 @@ static void swap_init(Unit *u) { s->timeout_usec = u->manager->default_timeout_start_usec; - exec_context_init(&s->exec_context); s->exec_context.std_output = u->manager->default_std_output; s->exec_context.std_error = u->manager->default_std_error; - kill_context_init(&s->kill_context); - cgroup_context_init(&s->cgroup_context); s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; @@ -155,8 +152,9 @@ static void swap_done(Unit *u) { free(s->parameters_fragment.what); s->parameters_fragment.what = NULL; - cgroup_context_done(&s->cgroup_context); - exec_context_done(&s->exec_context); + free(s->parameters_fragment.options); + s->parameters_fragment.options = NULL; + s->exec_runtime = exec_runtime_unref(s->exec_runtime); exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); s->control_command = NULL; @@ -184,24 +182,25 @@ static int swap_arm_timer(Swap *s) { return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); } - return sd_event_add_monotonic(UNIT(s)->manager->event, now(CLOCK_MONOTONIC) + s->timeout_usec, 0, swap_dispatch_timer, s, &s->timer_event_source); + return sd_event_add_time( + UNIT(s)->manager->event, + &s->timer_event_source, + CLOCK_MONOTONIC, + now(CLOCK_MONOTONIC) + s->timeout_usec, 0, + swap_dispatch_timer, s); } 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_fragment) return 0; if (is_device_path(s->what)) - return unit_add_node_link(UNIT(s), s->what, !p->noauto && UNIT(s)->manager->running_as == SYSTEMD_SYSTEM); + return unit_add_node_link(UNIT(s), s->what, UNIT(s)->manager->running_as == SYSTEMD_SYSTEM); else /* File based swap devices need to be ordered after * systemd-remount-fs.service, since they might need a @@ -210,7 +209,6 @@ static int swap_add_device_links(Swap *s) { } static int swap_add_default_dependencies(Swap *s) { - bool nofail = false, noauto = false; int r; assert(s); @@ -225,23 +223,15 @@ static int swap_add_default_dependencies(Swap *s) { if (r < 0) return r; - if (s->from_fragment) { - SwapParameters *p = &s->parameters_fragment; - - nofail = p->nofail; - noauto = p->noauto; - } - - if (!noauto) { - if (nofail) - r = unit_add_dependency_by_name_inverse(UNIT(s), UNIT_WANTS, SPECIAL_SWAP_TARGET, NULL, true); - else - r = unit_add_two_dependencies_by_name_inverse(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SWAP_TARGET, NULL, true); - if (r < 0) - return r; - } + if (!s->from_fragment) + /* The swap unit can either be for an alternative device name, in which + * case we don't need to add the dependency on swap.target because this unit + * is following a different unit which will have this dependency added, + * or it can be derived from /proc/swaps, in which case it was started + * manually, and should not become a dependency of swap.target. */ + return 0; - return 0; + return unit_add_two_dependencies_by_name_inverse(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SWAP_TARGET, NULL, true); } static int swap_verify(Swap *s) { @@ -303,9 +293,6 @@ static int swap_load(Unit *u) { return r; if (u->load_state == UNIT_LOADED) { - r = unit_add_exec_dependencies(u, &s->exec_context); - if (r < 0) - return r; if (UNIT(s)->fragment_path) s->from_fragment = true; @@ -342,7 +329,15 @@ static int swap_load(Unit *u) { if (r < 0) return r; - r = unit_add_default_slice(u); + r = unit_patch_contexts(u); + if (r < 0) + return r; + + r = unit_add_exec_dependencies(u, &s->exec_context); + if (r < 0) + return r; + + r = unit_add_default_slice(u, &s->cgroup_context); if (r < 0) return r; @@ -351,10 +346,6 @@ static int swap_load(Unit *u) { if (r < 0) return r; } - - r = unit_exec_context_defaults(u, &s->exec_context); - if (r < 0) - return r; } return swap_verify(s); @@ -365,8 +356,6 @@ static int swap_add_one( const char *what, const char *what_proc_swaps, int priority, - bool noauto, - bool nofail, bool set_flags) { _cleanup_free_ char *e = NULL; @@ -429,8 +418,6 @@ static int swap_add_one( SWAP(u)->from_proc_swaps = true; p->priority = priority; - p->noauto = noauto; - p->nofail = nofail; unit_add_to_dbus_queue(u); @@ -454,7 +441,7 @@ static int swap_process_new_swap(Manager *m, const char *device, int prio, bool assert(m); - r = swap_add_one(m, device, device, prio, false, false, set_flags); + r = swap_add_one(m, device, device, prio, set_flags); if (r < 0) return r; @@ -470,7 +457,7 @@ static int swap_process_new_swap(Manager *m, const char *device, int prio, bool /* Add the main device node */ dn = udev_device_get_devnode(d); if (dn && !streq(dn, device)) - swap_add_one(m, dn, device, prio, false, false, set_flags); + swap_add_one(m, dn, device, prio, set_flags); /* Add additional units for all symlinks */ first = udev_device_get_devlinks_list_entry(d); @@ -491,7 +478,7 @@ static int swap_process_new_swap(Manager *m, const char *device, int prio, bool st.st_rdev != udev_device_get_devnum(d)) continue; - swap_add_one(m, p, device, prio, false, false, set_flags); + swap_add_one(m, p, device, prio, set_flags); } return r; @@ -600,16 +587,14 @@ static void swap_dump(Unit *u, FILE *f, const char *prefix) { if (p) fprintf(f, "%sPriority: %i\n" - "%sNoAuto: %s\n" - "%sNoFail: %s\n", + "%sOptions: %s\n", prefix, p->priority, - prefix, yes_no(p->noauto), - prefix, yes_no(p->nofail)); + prefix, strempty(p->options)); if (s->control_pid > 0) fprintf(f, - "%sControl PID: %lu\n", - prefix, (unsigned long) s->control_pid); + "%sControl PID: "PID_FMT"\n", + prefix, s->control_pid); exec_context_dump(&s->exec_context, f, prefix); kill_context_dump(&s->kill_context, f, prefix); @@ -618,6 +603,11 @@ static void swap_dump(Unit *u, FILE *f, const char *prefix) { static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { pid_t pid; int r; + ExecParameters exec_params = { + .apply_permissions = true, + .apply_chroot = true, + .apply_tty_stdin = true, + }; assert(s); assert(c); @@ -633,20 +623,16 @@ static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { if (r < 0) goto fail; + exec_params.environment = UNIT(s)->manager->environment; + exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; + exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; + exec_params.cgroup_path = UNIT(s)->cgroup_path; + exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager); + exec_params.unit_id = UNIT(s)->id; + r = exec_spawn(c, - NULL, &s->exec_context, - NULL, 0, - UNIT(s)->manager->environment, - true, - true, - true, - UNIT(s)->manager->confirm_spawn, - UNIT(s)->manager->cgroup_supported, - UNIT(s)->cgroup_path, - UNIT(s)->id, - 0, - NULL, + &exec_params, s->exec_runtime, &pid); if (r < 0) @@ -676,6 +662,8 @@ static void swap_enter_dead(Swap *s, SwapResult f) { exec_runtime_destroy(s->exec_runtime); s->exec_runtime = exec_runtime_unref(s->exec_runtime); + exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); + swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); } @@ -699,7 +687,8 @@ static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { r = unit_kill_context( UNIT(s), &s->kill_context, - state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM, + (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ? + KILL_KILL : KILL_TERMINATE, -1, s->control_pid, false); @@ -712,7 +701,11 @@ static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { goto fail; swap_set_state(s, state); - } else + } else if (state == SWAP_ACTIVATING_SIGTERM) + swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS); + else if (state == SWAP_DEACTIVATING_SIGTERM) + swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); + else swap_enter_dead(s, SWAP_SUCCESS); return; @@ -724,38 +717,115 @@ fail: 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) { - int r, priority; + _cleanup_free_ char *discard = NULL; + int r, priority = -1; assert(s); s->control_command_id = SWAP_EXEC_ACTIVATE; s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; - if (s->from_fragment) + if (s->from_fragment) { + mount_find_discard(s->parameters_fragment.options, &discard); + priority = s->parameters_fragment.priority; - else - priority = -1; + if (priority < 0) + mount_find_pri(s->parameters_fragment.options, &priority); + } + + r = exec_command_set(s->control_command, "/sbin/swapon", NULL); + if (r < 0) + goto fail; if (priority >= 0) { char p[DECIMAL_STR_MAX(int)]; sprintf(p, "%i", priority); + r = exec_command_append(s->control_command, "-p", p, NULL); + if (r < 0) + goto fail; + } - 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 (discard && !streq(discard, "none")) { + const char *discard_arg; + if (streq(discard, "all")) + discard_arg = "--discard"; + else + discard_arg = strappenda("--discard=", discard); + + r = exec_command_append(s->control_command, discard_arg, NULL); + if (r < 0) + goto fail; + } + + r = exec_command_append(s->control_command, s->what, NULL); if (r < 0) goto fail; @@ -870,7 +940,7 @@ static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); if (s->control_pid > 0) - unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); + unit_serialize_item_format(u, f, "control-pid", PID_FMT, 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)); @@ -999,10 +1069,7 @@ static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { case SWAP_DEACTIVATING_SIGKILL: case SWAP_DEACTIVATING_SIGTERM: - if (f == SWAP_SUCCESS) - swap_enter_dead(s, f); - else - swap_enter_dead(s, f); + swap_enter_dead(s, f); break; default: @@ -1188,11 +1255,25 @@ static Unit *swap_following(Unit *u) { assert(s); - if (streq_ptr(s->what, s->devnode)) + /* If the user configured the swap through /etc/fstab or + * a device unit, follow that. */ + + if (s->from_fragment) return NULL; - /* Make everybody follow the unit that's named after the swap - * device in the kernel */ + LIST_FOREACH_AFTER(same_devnode, other, s) + if (other->from_fragment) + return UNIT(other); + + LIST_FOREACH_BEFORE(same_devnode, other, s) + if (other->from_fragment) + return UNIT(other); + + /* Otherwise make everybody follow the unit that's named after + * the swap device in the kernel */ + + if (streq_ptr(s->what, s->devnode)) + return NULL; LIST_FOREACH_AFTER(same_devnode, other, s) if (streq_ptr(other->what, other->devnode)) @@ -1205,6 +1286,7 @@ static Unit *swap_following(Unit *u) { first = other; } + /* Fall back to the first on the list */ return UNIT(first); } @@ -1221,7 +1303,7 @@ static int swap_following_set(Unit *u, Set **_set) { return 0; } - set = set_new(NULL, NULL); + set = set_new(NULL); if (!set) return -ENOMEM; @@ -1269,7 +1351,7 @@ static int swap_enumerate(Manager *m) { if (!m->proc_swaps) return errno == ENOENT ? 0 : -errno; - r = sd_event_add_io(m->event, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m, &m->swap_event_source); + r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); if (r < 0) goto fail; @@ -1370,6 +1452,20 @@ static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); } +static int swap_get_timeout(Unit *u, uint64_t *timeout) { + Swap *s = SWAP(u); + int r; + + if (!s->timer_event_source) + return 0; + + r = sd_event_source_get_time(s->timer_event_source, timeout); + if (r < 0) + return r; + + return 1; +} + static const char* const swap_state_table[_SWAP_STATE_MAX] = { [SWAP_DEAD] = "dead", [SWAP_ACTIVATING] = "activating", @@ -1432,6 +1528,8 @@ const UnitVTable swap_vtable = { .kill = swap_kill, + .get_timeout = swap_get_timeout, + .serialize = swap_serialize, .deserialize_item = swap_deserialize_item,