1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2013 Zbigniew Jędrzejewski-Szmek
6 Copyright 2018 Dell Inc.
10 //#include <linux/fs.h>
11 //#include <stdbool.h>
18 #include "alloc-util.h"
19 //#include "conf-parser.h"
21 //#include "env-util.h"
26 #include "parse-util.h"
27 #include "sleep-config.h"
28 #include "string-util.h"
31 #if 0 /// UNNEEDED by elogind
32 int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t *_delay) {
34 _cleanup_strv_free_ char
35 **suspend_mode = NULL, **suspend_state = NULL,
36 **hibernate_mode = NULL, **hibernate_state = NULL,
37 **hybrid_mode = NULL, **hybrid_state = NULL;
38 _cleanup_strv_free_ char **modes, **states; /* always initialized below */
39 usec_t delay = 180 * USEC_PER_MINUTE;
41 const ConfigTableItem items[] = {
42 { "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode },
43 { "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state },
44 { "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode },
45 { "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state },
46 { "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode },
47 { "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state },
48 { "Sleep", "HibernateDelaySec", config_parse_sec, 0, &delay},
52 (void) config_parse_many_nulstr(PKGSYSCONFDIR "/sleep.conf",
53 CONF_PATHS_NULSTR("elogind/sleep.conf.d"),
54 "Sleep\0", config_item_table_lookup, items,
55 CONFIG_PARSE_WARN, NULL);
57 if (streq(verb, "suspend")) {
58 /* empty by default */
59 modes = TAKE_PTR(suspend_mode);
62 states = TAKE_PTR(suspend_state);
64 states = strv_new("mem", "standby", "freeze", NULL);
66 } else if (streq(verb, "hibernate")) {
68 modes = TAKE_PTR(hibernate_mode);
70 modes = strv_new("platform", "shutdown", NULL);
73 states = TAKE_PTR(hibernate_state);
75 states = strv_new("disk", NULL);
77 } else if (streq(verb, "hybrid-sleep")) {
79 modes = TAKE_PTR(hybrid_mode);
81 modes = strv_new("suspend", "platform", "shutdown", NULL);
84 states = TAKE_PTR(hybrid_state);
86 states = strv_new("disk", NULL);
88 } else if (streq(verb, "suspend-then-hibernate"))
89 modes = states = NULL;
91 assert_not_reached("what verb");
93 if ((!modes && STR_IN_SET(verb, "hibernate", "hybrid-sleep")) ||
94 (!states && !streq(verb, "suspend-then-hibernate")))
98 *_modes = TAKE_PTR(modes);
100 *_states = TAKE_PTR(states);
108 #if 1 /// Only available in this file for elogind
111 int can_sleep_state(char **types) {
114 _cleanup_free_ char *p = NULL;
116 if (strv_isempty(types))
119 /* If /sys is read-only we cannot sleep */
120 if (access("/sys/power/state", W_OK) < 0)
123 r = read_one_line_file("/sys/power/state", &p);
127 STRV_FOREACH(type, types) {
128 const char *word, *state;
132 FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state)
133 if (l == k && memcmp(word, *type, l) == 0)
140 #if 1 /// Only available in this file for elogind
143 int can_sleep_disk(char **types) {
146 _cleanup_free_ char *p = NULL;
148 if (strv_isempty(types))
151 /* If /sys is read-only we cannot sleep */
152 if (access("/sys/power/disk", W_OK) < 0)
155 r = read_one_line_file("/sys/power/disk", &p);
159 STRV_FOREACH(type, types) {
160 const char *word, *state;
164 FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) {
165 if (l == k && memcmp(word, *type, l) == 0)
170 memcmp(word + 1, *type, l - 2) == 0 &&
179 #define HIBERNATION_SWAP_THRESHOLD 0.98
181 int find_hibernate_location(char **device, char **type, size_t *size, size_t *used) {
182 _cleanup_fclose_ FILE *f;
185 f = fopen("/proc/swaps", "re");
187 log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
188 "Failed to retrieve open /proc/swaps: %m");
193 (void) fscanf(f, "%*s %*s %*s %*s %*s\n");
196 _cleanup_free_ char *dev_field = NULL, *type_field = NULL;
197 size_t size_field, used_field;
201 "%ms " /* device/file */
202 "%ms " /* type of swap */
203 "%zu " /* swap size */
205 "%*i\n", /* priority */
206 &dev_field, &type_field, &size_field, &used_field);
211 log_warning("Failed to parse /proc/swaps:%u", i);
215 if (streq(type_field, "partition") && endswith(dev_field, "\\040(deleted)")) {
216 log_warning("Ignoring deleted swapfile '%s'.", dev_field);
220 *device = TAKE_PTR(dev_field);
222 *type = TAKE_PTR(type_field);
230 log_debug("No swap partitions were found.");
234 static bool enough_swap_for_hibernation(void) {
235 _cleanup_free_ char *active = NULL;
236 unsigned long long act = 0;
237 size_t size = 0, used = 0;
240 #if 0 /// elogind does not allow any bypass, we are never init!
241 if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0)
245 r = find_hibernate_location(NULL, NULL, &size, &used);
249 r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active);
251 log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m");
255 r = safe_atollu(active, &act);
257 log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m",
262 r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
263 log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%",
264 r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD);
269 int read_fiemap(int fd, struct fiemap **ret) {
270 _cleanup_free_ struct fiemap *fiemap = NULL, *result_fiemap = NULL;
271 struct stat statinfo;
272 uint32_t result_extents = 0;
273 uint64_t fiemap_start = 0, fiemap_length;
274 const size_t n_extra = DIV_ROUND_UP(sizeof(struct fiemap), sizeof(struct fiemap_extent));
275 size_t fiemap_allocated = n_extra, result_fiemap_allocated = n_extra;
277 if (fstat(fd, &statinfo) < 0)
278 return log_debug_errno(errno, "Cannot determine file size: %m");
279 if (!S_ISREG(statinfo.st_mode))
281 fiemap_length = statinfo.st_size;
283 /* Zero this out in case we run on a file with no extents */
284 fiemap = calloc(n_extra, sizeof(struct fiemap_extent));
288 result_fiemap = malloc_multiply(n_extra, sizeof(struct fiemap_extent));
292 /* XFS filesystem has incorrect implementation of fiemap ioctl and
293 * returns extents for only one block-group at a time, so we need
294 * to handle it manually, starting the next fiemap call from the end
297 while (fiemap_start < fiemap_length) {
298 *fiemap = (struct fiemap) {
299 .fm_start = fiemap_start,
300 .fm_length = fiemap_length,
301 .fm_flags = FIEMAP_FLAG_SYNC,
304 /* Find out how many extents there are */
305 if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
306 return log_debug_errno(errno, "Failed to read extents: %m");
308 /* Nothing to process */
309 if (fiemap->fm_mapped_extents == 0)
312 /* Resize fiemap to allow us to read in the extents, result fiemap has to hold all
313 * the extents for the whole file. Add space for the initial struct fiemap. */
314 if (!greedy_realloc0((void**) &fiemap, &fiemap_allocated,
315 n_extra + fiemap->fm_mapped_extents, sizeof(struct fiemap_extent)))
318 fiemap->fm_extent_count = fiemap->fm_mapped_extents;
319 fiemap->fm_mapped_extents = 0;
321 if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
322 return log_debug_errno(errno, "Failed to read extents: %m");
324 /* Resize result_fiemap to allow us to copy in the extents */
325 if (!greedy_realloc((void**) &result_fiemap, &result_fiemap_allocated,
326 n_extra + result_extents + fiemap->fm_mapped_extents, sizeof(struct fiemap_extent)))
329 memcpy(result_fiemap->fm_extents + result_extents,
331 sizeof(struct fiemap_extent) * fiemap->fm_mapped_extents);
333 result_extents += fiemap->fm_mapped_extents;
335 /* Highly unlikely that it is zero */
336 if (_likely_(fiemap->fm_mapped_extents > 0)) {
337 uint32_t i = fiemap->fm_mapped_extents - 1;
339 fiemap_start = fiemap->fm_extents[i].fe_logical +
340 fiemap->fm_extents[i].fe_length;
342 if (fiemap->fm_extents[i].fe_flags & FIEMAP_EXTENT_LAST)
347 memcpy(result_fiemap, fiemap, sizeof(struct fiemap));
348 result_fiemap->fm_mapped_extents = result_extents;
349 *ret = TAKE_PTR(result_fiemap);
353 #if 0 /// elogind has to do, or better, *can* do it differently
354 static bool can_s2h(void) {
358 r = access("/sys/class/rtc/rtc0/wakealarm", W_OK);
360 log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
361 "/sys/class/rct/rct0/wakealarm is not writable %m");
365 FOREACH_STRING(p, "suspend", "hibernate") {
367 if (IN_SET(r, 0, -ENOSPC)) {
368 log_debug("Unable to %s system.", p);
372 return log_debug_errno(r, "Failed to check if %s is possible: %m", p);
378 int can_sleep(Manager *m, const char *verb) {
380 assert(streq(verb, "suspend") ||
381 streq(verb, "hibernate") ||
382 streq(verb, "hybrid-sleep"));
383 int can_sleep(const char *verb) {
384 _cleanup_strv_free_ char **modes = NULL, **states = NULL;
387 if ( streq(verb, "suspend")
388 && ( !can_sleep_state(m->suspend_state)
389 || !can_sleep_disk(m->suspend_mode) ) )
391 assert(STR_IN_SET(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-to-hibernate"));
392 assert(STR_IN_SET(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate"));
394 if ( streq(verb, "hibernate")
395 && ( !can_sleep_state(m->hibernate_state)
396 || !can_sleep_disk(m->hibernate_mode) ) )
398 if (streq(verb, "suspend-to-hibernate"))
399 if (streq(verb, "suspend-then-hibernate"))
402 if ( streq(verb, "hybrid-sleep")
403 && ( !can_sleep_state(m->hybrid_sleep_state)
404 || !can_sleep_disk(m->hybrid_sleep_mode) ) )
405 r = parse_sleep_config(verb, &modes, &states, NULL);
409 if (!can_sleep_state(states) || !can_sleep_disk(modes))
412 return streq(verb, "suspend") || enough_memory_for_hibernation();
413 if (streq(verb, "suspend"))
416 if (!enough_memory_for_hibernation())
417 if (!enough_swap_for_hibernation())