summaryrefslogtreecommitdiff
path: root/src/shared/sleep-config.c
blob: 8fa0d6ff8c5f1a2bd181b212ab2552d4b4ac1502 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
/* SPDX-License-Identifier: LGPL-2.1+ */
/***
  Copyright © 2013 Zbigniew Jędrzejewski-Szmek
  Copyright © 2018 Dell Inc.
***/

#include <errno.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#include "alloc-util.h"
#include "conf-parser.h"
#include "def.h"
#include "env-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "macro.h"
#include "parse-util.h"
#include "sleep-config.h"
#include "string-util.h"
#include "strv.h"

int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t *_delay) {

        _cleanup_strv_free_ char
                **suspend_mode = NULL, **suspend_state = NULL,
                **hibernate_mode = NULL, **hibernate_state = NULL,
                **hybrid_mode = NULL, **hybrid_state = NULL;
        _cleanup_strv_free_ char **modes, **states; /* always initialized below */
        usec_t delay = 180 * USEC_PER_MINUTE;

        const ConfigTableItem items[] = {
                { "Sleep",   "SuspendMode",      config_parse_strv,  0, &suspend_mode  },
                { "Sleep",   "SuspendState",     config_parse_strv,  0, &suspend_state },
                { "Sleep",   "HibernateMode",    config_parse_strv,  0, &hibernate_mode  },
                { "Sleep",   "HibernateState",   config_parse_strv,  0, &hibernate_state },
                { "Sleep",   "HybridSleepMode",  config_parse_strv,  0, &hybrid_mode  },
                { "Sleep",   "HybridSleepState", config_parse_strv,  0, &hybrid_state },
                { "Sleep",   "HibernateDelaySec", config_parse_sec,  0, &delay},
                {}
        };

        (void) config_parse_many_nulstr(PKGSYSCONFDIR "/sleep.conf",
                                        CONF_PATHS_NULSTR("systemd/sleep.conf.d"),
                                        "Sleep\0", config_item_table_lookup, items,
                                        CONFIG_PARSE_WARN, NULL);

        if (streq(verb, "suspend")) {
                /* empty by default */
                modes = TAKE_PTR(suspend_mode);

                if (suspend_state)
                        states = TAKE_PTR(suspend_state);
                else
                        states = strv_new("mem", "standby", "freeze", NULL);

        } else if (streq(verb, "hibernate")) {
                if (hibernate_mode)
                        modes = TAKE_PTR(hibernate_mode);
                else
                        modes = strv_new("platform", "shutdown", NULL);

                if (hibernate_state)
                        states = TAKE_PTR(hibernate_state);
                else
                        states = strv_new("disk", NULL);

        } else if (streq(verb, "hybrid-sleep")) {
                if (hybrid_mode)
                        modes = TAKE_PTR(hybrid_mode);
                else
                        modes = strv_new("suspend", "platform", "shutdown", NULL);

                if (hybrid_state)
                        states = TAKE_PTR(hybrid_state);
                else
                        states = strv_new("disk", NULL);

        } else if (streq(verb, "suspend-then-hibernate"))
                modes = states = NULL;
        else
                assert_not_reached("what verb");

        if ((!modes && STR_IN_SET(verb, "hibernate", "hybrid-sleep")) ||
            (!states && !streq(verb, "suspend-then-hibernate")))
                return log_oom();

        if (_modes)
                *_modes = TAKE_PTR(modes);
        if (_states)
                *_states = TAKE_PTR(states);
        if (_delay)
                *_delay = delay;

        return 0;
}

int can_sleep_state(char **types) {
        char **type;
        int r;
        _cleanup_free_ char *p = NULL;

        if (strv_isempty(types))
                return true;

        /* If /sys is read-only we cannot sleep */
        if (access("/sys/power/state", W_OK) < 0)
                return false;

        r = read_one_line_file("/sys/power/state", &p);
        if (r < 0)
                return false;

        STRV_FOREACH(type, types) {
                const char *word, *state;
                size_t l, k;

                k = strlen(*type);
                FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state)
                        if (l == k && memcmp(word, *type, l) == 0)
                                return true;
        }

        return false;
}

int can_sleep_disk(char **types) {
        char **type;
        int r;
        _cleanup_free_ char *p = NULL;

        if (strv_isempty(types))
                return true;

        /* If /sys is read-only we cannot sleep */
        if (access("/sys/power/disk", W_OK) < 0)
                return false;

        r = read_one_line_file("/sys/power/disk", &p);
        if (r < 0)
                return false;

        STRV_FOREACH(type, types) {
                const char *word, *state;
                size_t l, k;

                k = strlen(*type);
                FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) {
                        if (l == k && memcmp(word, *type, l) == 0)
                                return true;

                        if (l == k + 2 &&
                            word[0] == '[' &&
                            memcmp(word + 1, *type, l - 2) == 0 &&
                            word[l-1] == ']')
                                return true;
                }
        }

        return false;
}

#define HIBERNATION_SWAP_THRESHOLD 0.98

int find_hibernate_location(char **device, char **type, size_t *size, size_t *used) {
        _cleanup_fclose_ FILE *f;
        unsigned i;

        f = fopen("/proc/swaps", "re");
        if (!f) {
                log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
                         "Failed to retrieve open /proc/swaps: %m");
                assert(errno > 0);
                return -errno;
        }

        (void) fscanf(f, "%*s %*s %*s %*s %*s\n");

        for (i = 1;; i++) {
                _cleanup_free_ char *dev_field = NULL, *type_field = NULL;
                size_t size_field, used_field;
                int k;

                k = fscanf(f,
                           "%ms "   /* device/file */
                           "%ms "   /* type of swap */
                           "%zu "   /* swap size */
                           "%zu "   /* used */
                           "%*i\n", /* priority */
                           &dev_field, &type_field, &size_field, &used_field);
                if (k != 4) {
                        if (k == EOF)
                                break;

                        log_warning("Failed to parse /proc/swaps:%u", i);
                        continue;
                }

                if (streq(type_field, "partition") && endswith(dev_field, "\\040(deleted)")) {
                        log_warning("Ignoring deleted swapfile '%s'.", dev_field);
                        continue;
                }
                if (device)
                        *device = TAKE_PTR(dev_field);
                if (type)
                        *type = TAKE_PTR(type_field);
                if (size)
                        *size = size_field;
                if (used)
                        *used = used_field;
                return 0;
        }

        log_debug("No swap partitions were found.");
        return -ENOSYS;
}

static bool enough_swap_for_hibernation(void) {
        _cleanup_free_ char *active = NULL;
        unsigned long long act = 0;
        size_t size = 0, used = 0;
        int r;

        if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0)
                return true;

        r = find_hibernate_location(NULL, NULL, &size, &used);
        if (r < 0)
                return false;

        r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active);
        if (r < 0) {
                log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m");
                return false;
        }

        r = safe_atollu(active, &act);
        if (r < 0) {
                log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m",
                                active);
                return false;
        }

        r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
        log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%",
                  r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD);

        return r;
}

int read_fiemap(int fd, struct fiemap **ret) {
        _cleanup_free_ struct fiemap *fiemap = NULL, *result_fiemap = NULL;
        struct stat statinfo;
        uint32_t result_extents = 0;
        uint64_t fiemap_start = 0, fiemap_length;
        const size_t n_extra = DIV_ROUND_UP(sizeof(struct fiemap), sizeof(struct fiemap_extent));
        size_t fiemap_allocated = n_extra, result_fiemap_allocated = n_extra;

        if (fstat(fd, &statinfo) < 0)
                return log_debug_errno(errno, "Cannot determine file size: %m");
        if (!S_ISREG(statinfo.st_mode))
                return -ENOTTY;
        fiemap_length = statinfo.st_size;

        /* Zero this out in case we run on a file with no extents */
        fiemap = calloc(n_extra, sizeof(struct fiemap_extent));
        if (!fiemap)
                return -ENOMEM;

        result_fiemap = malloc_multiply(n_extra, sizeof(struct fiemap_extent));
        if (!result_fiemap)
                return -ENOMEM;

        /*  XFS filesystem has incorrect implementation of fiemap ioctl and
         *  returns extents for only one block-group at a time, so we need
         *  to handle it manually, starting the next fiemap call from the end
         *  of the last extent
         */
        while (fiemap_start < fiemap_length) {
                *fiemap = (struct fiemap) {
                        .fm_start = fiemap_start,
                        .fm_length = fiemap_length,
                        .fm_flags = FIEMAP_FLAG_SYNC,
                };

                /* Find out how many extents there are */
                if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
                        return log_debug_errno(errno, "Failed to read extents: %m");

                /* Nothing to process */
                if (fiemap->fm_mapped_extents == 0)
                        break;

                /* Resize fiemap to allow us to read in the extents, result fiemap has to hold all
                 * the extents for the whole file. Add space for the initial struct fiemap. */
                if (!greedy_realloc0((void**) &fiemap, &fiemap_allocated,
                                     n_extra + fiemap->fm_mapped_extents, sizeof(struct fiemap_extent)))
                        return -ENOMEM;

                fiemap->fm_extent_count = fiemap->fm_mapped_extents;
                fiemap->fm_mapped_extents = 0;

                if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
                        return log_debug_errno(errno, "Failed to read extents: %m");

                /* Resize result_fiemap to allow us to copy in the extents */
                if (!greedy_realloc((void**) &result_fiemap, &result_fiemap_allocated,
                                    n_extra + result_extents + fiemap->fm_mapped_extents, sizeof(struct fiemap_extent)))
                        return -ENOMEM;

                memcpy(result_fiemap->fm_extents + result_extents,
                       fiemap->fm_extents,
                       sizeof(struct fiemap_extent) * fiemap->fm_mapped_extents);

                result_extents += fiemap->fm_mapped_extents;

                /* Highly unlikely that it is zero */
                if (_likely_(fiemap->fm_mapped_extents > 0)) {
                        uint32_t i = fiemap->fm_mapped_extents - 1;

                        fiemap_start = fiemap->fm_extents[i].fe_logical +
                                       fiemap->fm_extents[i].fe_length;

                        if (fiemap->fm_extents[i].fe_flags & FIEMAP_EXTENT_LAST)
                                break;
                }
        }

        memcpy(result_fiemap, fiemap, sizeof(struct fiemap));
        result_fiemap->fm_mapped_extents = result_extents;
        *ret = TAKE_PTR(result_fiemap);
        return 0;
}

static bool can_s2h(void) {
        const char *p;
        int r;

        r = access("/sys/class/rtc/rtc0/wakealarm", W_OK);
        if (r < 0) {
                log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
                         "/sys/class/rct/rct0/wakealarm is not writable %m");
                return false;
        }

        FOREACH_STRING(p, "suspend", "hibernate") {
                r = can_sleep(p);
                if (IN_SET(r, 0, -ENOSPC)) {
                        log_debug("Unable to %s system.", p);
                        return false;
                }
                if (r < 0)
                        return log_debug_errno(r, "Failed to check if %s is possible: %m", p);
        }

        return true;
}

int can_sleep(const char *verb) {
        _cleanup_strv_free_ char **modes = NULL, **states = NULL;
        int r;

        assert(STR_IN_SET(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate"));

        if (streq(verb, "suspend-then-hibernate"))
                return can_s2h();

        r = parse_sleep_config(verb, &modes, &states, NULL);
        if (r < 0)
                return false;

        if (!can_sleep_state(states) || !can_sleep_disk(modes))
                return false;

        if (streq(verb, "suspend"))
                return true;

        if (!enough_swap_for_hibernation())
                return -ENOSPC;

        return true;
}