460 lines
16 KiB
C
460 lines
16 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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Copyright © 2018 Dell Inc.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/fs.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "conf-parser.h"
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#include "def.h"
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#include "env-util.h"
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#include "errno-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "macro.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "sleep-config.h"
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#include "string-util.h"
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#include "strv.h"
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#include "time-util.h"
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int parse_sleep_config(SleepConfig **ret_sleep_config) {
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_cleanup_(free_sleep_configp) SleepConfig *sc;
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int allow_suspend = -1, allow_hibernate = -1,
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allow_s2h = -1, allow_hybrid_sleep = -1;
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sc = new0(SleepConfig, 1);
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if (!sc)
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return log_oom();
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const ConfigTableItem items[] = {
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{ "Sleep", "AllowSuspend", config_parse_tristate, 0, &allow_suspend },
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{ "Sleep", "AllowHibernation", config_parse_tristate, 0, &allow_hibernate },
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{ "Sleep", "AllowSuspendThenHibernate", config_parse_tristate, 0, &allow_s2h },
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{ "Sleep", "AllowHybridSleep", config_parse_tristate, 0, &allow_hybrid_sleep },
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{ "Sleep", "SuspendMode", config_parse_strv, 0, &sc->suspend_modes },
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{ "Sleep", "SuspendState", config_parse_strv, 0, &sc->suspend_states },
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{ "Sleep", "HibernateMode", config_parse_strv, 0, &sc->hibernate_modes },
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{ "Sleep", "HibernateState", config_parse_strv, 0, &sc->hibernate_states },
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{ "Sleep", "HybridSleepMode", config_parse_strv, 0, &sc->hybrid_modes },
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{ "Sleep", "HybridSleepState", config_parse_strv, 0, &sc->hybrid_states },
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{ "Sleep", "HibernateDelaySec", config_parse_sec, 0, &sc->hibernate_delay_sec},
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{}
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};
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(void) config_parse_many_nulstr(PKGSYSCONFDIR "/sleep.conf",
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CONF_PATHS_NULSTR("systemd/sleep.conf.d"),
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"Sleep\0", config_item_table_lookup, items,
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CONFIG_PARSE_WARN, NULL);
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/* use default values unless set */
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sc->allow_suspend = allow_suspend != 0;
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sc->allow_hibernate = allow_hibernate != 0;
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sc->allow_hybrid_sleep = allow_hybrid_sleep > 0
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|| (allow_suspend != 0 && allow_hibernate != 0);
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sc->allow_s2h = allow_s2h > 0
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|| (allow_suspend != 0 && allow_hibernate != 0);
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if (!sc->suspend_states)
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sc->suspend_states = strv_new("mem", "standby", "freeze");
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if (!sc->hibernate_modes)
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sc->hibernate_modes = strv_new("platform", "shutdown");
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if (!sc->hibernate_states)
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sc->hibernate_states = strv_new("disk");
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if (!sc->hybrid_modes)
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sc->hybrid_modes = strv_new("suspend", "platform", "shutdown");
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if (!sc->hybrid_states)
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sc->hybrid_states = strv_new("disk");
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if (sc->hibernate_delay_sec == 0)
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sc->hibernate_delay_sec = 180 * USEC_PER_MINUTE;
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/* ensure values set for all required fields */
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if (!sc->suspend_states || !sc->hibernate_modes
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|| !sc->hibernate_states || !sc->hybrid_modes || !sc->hybrid_states)
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return log_oom();
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*ret_sleep_config = TAKE_PTR(sc);
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return 0;
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}
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int can_sleep_state(char **types) {
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char **type;
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int r;
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_cleanup_free_ char *p = NULL;
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if (strv_isempty(types))
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return true;
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/* If /sys is read-only we cannot sleep */
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if (access("/sys/power/state", W_OK) < 0)
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return false;
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r = read_one_line_file("/sys/power/state", &p);
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if (r < 0)
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return false;
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STRV_FOREACH(type, types) {
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const char *word, *state;
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size_t l, k;
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k = strlen(*type);
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FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state)
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if (l == k && memcmp(word, *type, l) == 0)
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return true;
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}
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return false;
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}
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int can_sleep_disk(char **types) {
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char **type;
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int r;
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_cleanup_free_ char *p = NULL;
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if (strv_isempty(types))
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return true;
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/* If /sys is read-only we cannot sleep */
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if (access("/sys/power/disk", W_OK) < 0) {
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log_debug_errno(errno, "/sys/power/disk is not writable: %m");
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return false;
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}
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r = read_one_line_file("/sys/power/disk", &p);
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if (r < 0) {
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log_debug_errno(r, "Couldn't read /sys/power/disk: %m");
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return false;
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}
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STRV_FOREACH(type, types) {
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const char *word, *state;
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size_t l, k;
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k = strlen(*type);
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FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) {
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if (l == k && memcmp(word, *type, l) == 0)
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return true;
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if (l == k + 2 &&
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word[0] == '[' &&
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memcmp(word + 1, *type, l - 2) == 0 &&
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word[l-1] == ']')
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return true;
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}
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}
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return false;
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}
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#define HIBERNATION_SWAP_THRESHOLD 0.98
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int find_hibernate_location(char **device, char **type, size_t *size, size_t *used) {
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_cleanup_fclose_ FILE *f;
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unsigned i;
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f = fopen("/proc/swaps", "re");
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if (!f) {
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log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
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"Failed to retrieve open /proc/swaps: %m");
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return negative_errno();
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}
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(void) fscanf(f, "%*s %*s %*s %*s %*s\n");
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for (i = 1;; i++) {
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_cleanup_free_ char *dev_field = NULL, *type_field = NULL;
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size_t size_field, used_field;
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int k;
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k = fscanf(f,
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"%ms " /* device/file */
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"%ms " /* type of swap */
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"%zu " /* swap size */
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"%zu " /* used */
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"%*i\n", /* priority */
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&dev_field, &type_field, &size_field, &used_field);
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if (k == EOF)
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break;
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if (k != 4) {
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log_warning("Failed to parse /proc/swaps:%u", i);
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continue;
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}
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if (streq(type_field, "file")) {
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if (endswith(dev_field, "\\040(deleted)")) {
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log_warning("Ignoring deleted swap file '%s'.", dev_field);
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continue;
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}
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} else if (streq(type_field, "partition")) {
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const char *fn;
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fn = path_startswith(dev_field, "/dev/");
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if (fn && startswith(fn, "zram")) {
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log_debug("Ignoring compressed RAM swap device '%s'.", dev_field);
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continue;
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}
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}
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if (device)
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*device = TAKE_PTR(dev_field);
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if (type)
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*type = TAKE_PTR(type_field);
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if (size)
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*size = size_field;
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if (used)
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*used = used_field;
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return 0;
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}
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return log_debug_errno(SYNTHETIC_ERRNO(ENOSYS),
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"No swap partitions were found.");
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}
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static bool enough_swap_for_hibernation(void) {
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_cleanup_free_ char *active = NULL;
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unsigned long long act = 0;
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size_t size = 0, used = 0;
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int r;
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if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0)
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return true;
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r = find_hibernate_location(NULL, NULL, &size, &used);
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if (r < 0)
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return false;
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r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active);
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if (r < 0) {
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log_debug_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m");
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return false;
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}
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r = safe_atollu(active, &act);
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if (r < 0) {
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log_debug_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m", active);
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return false;
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}
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r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
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log_debug("%s swap for hibernation, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%",
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r ? "Enough" : "Not enough", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD);
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return r;
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}
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int read_fiemap(int fd, struct fiemap **ret) {
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_cleanup_free_ struct fiemap *fiemap = NULL, *result_fiemap = NULL;
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struct stat statinfo;
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uint32_t result_extents = 0;
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uint64_t fiemap_start = 0, fiemap_length;
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const size_t n_extra = DIV_ROUND_UP(sizeof(struct fiemap), sizeof(struct fiemap_extent));
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size_t fiemap_allocated = n_extra, result_fiemap_allocated = n_extra;
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if (fstat(fd, &statinfo) < 0)
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return log_debug_errno(errno, "Cannot determine file size: %m");
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if (!S_ISREG(statinfo.st_mode))
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return -ENOTTY;
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fiemap_length = statinfo.st_size;
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/* Zero this out in case we run on a file with no extents */
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fiemap = calloc(n_extra, sizeof(struct fiemap_extent));
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if (!fiemap)
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return -ENOMEM;
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result_fiemap = malloc_multiply(n_extra, sizeof(struct fiemap_extent));
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if (!result_fiemap)
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return -ENOMEM;
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/* XFS filesystem has incorrect implementation of fiemap ioctl and
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* returns extents for only one block-group at a time, so we need
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* to handle it manually, starting the next fiemap call from the end
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* of the last extent
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*/
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while (fiemap_start < fiemap_length) {
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*fiemap = (struct fiemap) {
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.fm_start = fiemap_start,
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.fm_length = fiemap_length,
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.fm_flags = FIEMAP_FLAG_SYNC,
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};
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/* Find out how many extents there are */
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if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
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return log_debug_errno(errno, "Failed to read extents: %m");
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/* Nothing to process */
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if (fiemap->fm_mapped_extents == 0)
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break;
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/* Resize fiemap to allow us to read in the extents, result fiemap has to hold all
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* the extents for the whole file. Add space for the initial struct fiemap. */
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if (!greedy_realloc0((void**) &fiemap, &fiemap_allocated,
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n_extra + fiemap->fm_mapped_extents, sizeof(struct fiemap_extent)))
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return -ENOMEM;
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fiemap->fm_extent_count = fiemap->fm_mapped_extents;
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fiemap->fm_mapped_extents = 0;
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if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
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return log_debug_errno(errno, "Failed to read extents: %m");
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/* Resize result_fiemap to allow us to copy in the extents */
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if (!greedy_realloc((void**) &result_fiemap, &result_fiemap_allocated,
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n_extra + result_extents + fiemap->fm_mapped_extents, sizeof(struct fiemap_extent)))
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return -ENOMEM;
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memcpy(result_fiemap->fm_extents + result_extents,
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fiemap->fm_extents,
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sizeof(struct fiemap_extent) * fiemap->fm_mapped_extents);
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result_extents += fiemap->fm_mapped_extents;
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/* Highly unlikely that it is zero */
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if (_likely_(fiemap->fm_mapped_extents > 0)) {
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uint32_t i = fiemap->fm_mapped_extents - 1;
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fiemap_start = fiemap->fm_extents[i].fe_logical +
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fiemap->fm_extents[i].fe_length;
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if (fiemap->fm_extents[i].fe_flags & FIEMAP_EXTENT_LAST)
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break;
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}
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}
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memcpy(result_fiemap, fiemap, sizeof(struct fiemap));
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result_fiemap->fm_mapped_extents = result_extents;
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*ret = TAKE_PTR(result_fiemap);
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return 0;
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}
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static int can_sleep_internal(const char *verb, bool check_allowed, const SleepConfig *sleep_config);
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static bool can_s2h(const SleepConfig *sleep_config) {
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const char *p;
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int r;
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if (!clock_supported(CLOCK_BOOTTIME_ALARM)) {
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log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
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"CLOCK_BOOTTIME_ALARM is not supported");
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return false;
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}
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FOREACH_STRING(p, "suspend", "hibernate") {
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r = can_sleep_internal(p, false, sleep_config);
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if (IN_SET(r, 0, -ENOSPC, -EADV)) {
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log_debug("Unable to %s system.", p);
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return false;
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}
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if (r < 0)
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return log_debug_errno(r, "Failed to check if %s is possible: %m", p);
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}
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return true;
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}
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static int can_sleep_internal(const char *verb, bool check_allowed, const SleepConfig *sleep_config) {
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bool allow;
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char **modes = NULL, **states = NULL;
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int r;
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assert(STR_IN_SET(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate"));
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r = sleep_settings(verb, sleep_config, &allow, &modes, &states);
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if (r < 0)
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return false;
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if (check_allowed && !allow) {
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log_debug("Sleep mode \"%s\" is disabled by configuration.", verb);
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return false;
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}
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if (streq(verb, "suspend-then-hibernate"))
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return can_s2h(sleep_config);
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if (!can_sleep_state(states) || !can_sleep_disk(modes))
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return false;
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if (streq(verb, "suspend"))
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return true;
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if (!enough_swap_for_hibernation())
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return -ENOSPC;
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return true;
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}
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int can_sleep(const char *verb) {
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_cleanup_(free_sleep_configp) SleepConfig *sleep_config = NULL;
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int r;
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r = parse_sleep_config(&sleep_config);
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if (r < 0)
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return r;
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return can_sleep_internal(verb, true, sleep_config);
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}
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int sleep_settings(const char *verb, const SleepConfig *sleep_config, bool *ret_allow, char ***ret_modes, char ***ret_states) {
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assert(verb);
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assert(sleep_config);
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assert(STR_IN_SET(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate"));
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if (streq(verb, "suspend")) {
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*ret_allow = sleep_config->allow_suspend;
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*ret_modes = sleep_config->suspend_modes;
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*ret_states = sleep_config->suspend_states;
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} else if (streq(verb, "hibernate")) {
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*ret_allow = sleep_config->allow_hibernate;
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*ret_modes = sleep_config->hibernate_modes;
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*ret_states = sleep_config->hibernate_states;
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} else if (streq(verb, "hybrid-sleep")) {
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*ret_allow = sleep_config->allow_hybrid_sleep;
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*ret_modes = sleep_config->hybrid_modes;
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*ret_states = sleep_config->hybrid_states;
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} else if (streq(verb, "suspend-then-hibernate")) {
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*ret_allow = sleep_config->allow_s2h;
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*ret_modes = *ret_states = NULL;
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}
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/* suspend modes empty by default */
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if ((!ret_modes && !streq(verb, "suspend")) || !ret_states)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No modes or states set for %s; Check sleep.conf", verb);
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return 0;
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}
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void free_sleep_config(SleepConfig *sc) {
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if (!sc)
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return;
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strv_free(sc->suspend_modes);
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strv_free(sc->suspend_states);
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strv_free(sc->hibernate_modes);
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strv_free(sc->hibernate_states);
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strv_free(sc->hybrid_modes);
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strv_free(sc->hybrid_states);
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free(sc);
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}
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