| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| /*** |
| Copyright © 2018 Dell Inc. |
| ***/ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <linux/fs.h> |
| #include <linux/magic.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <syslog.h> |
| #include <unistd.h> |
| |
| #include "alloc-util.h" |
| #include "blockdev-util.h" |
| #include "btrfs-util.h" |
| #include "conf-parser.h" |
| #include "def.h" |
| #include "env-util.h" |
| #include "errno-util.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "sleep-config.h" |
| #include "stat-util.h" |
| #include "stdio-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "time-util.h" |
| |
| int parse_sleep_config(SleepConfig **ret_sleep_config) { |
| _cleanup_(free_sleep_configp) SleepConfig *sc = NULL; |
| int allow_suspend = -1, allow_hibernate = -1, |
| allow_s2h = -1, allow_hybrid_sleep = -1; |
| |
| sc = new0(SleepConfig, 1); |
| if (!sc) |
| return log_oom(); |
| |
| const ConfigTableItem items[] = { |
| { "Sleep", "AllowSuspend", config_parse_tristate, 0, &allow_suspend }, |
| { "Sleep", "AllowHibernation", config_parse_tristate, 0, &allow_hibernate }, |
| { "Sleep", "AllowSuspendThenHibernate", config_parse_tristate, 0, &allow_s2h }, |
| { "Sleep", "AllowHybridSleep", config_parse_tristate, 0, &allow_hybrid_sleep }, |
| |
| { "Sleep", "SuspendMode", config_parse_strv, 0, sc->modes + SLEEP_SUSPEND }, |
| { "Sleep", "SuspendState", config_parse_strv, 0, sc->states + SLEEP_SUSPEND }, |
| { "Sleep", "HibernateMode", config_parse_strv, 0, sc->modes + SLEEP_HIBERNATE }, |
| { "Sleep", "HibernateState", config_parse_strv, 0, sc->states + SLEEP_HIBERNATE }, |
| { "Sleep", "HybridSleepMode", config_parse_strv, 0, sc->modes + SLEEP_HYBRID_SLEEP }, |
| { "Sleep", "HybridSleepState", config_parse_strv, 0, sc->states + SLEEP_HYBRID_SLEEP }, |
| |
| { "Sleep", "HibernateDelaySec", config_parse_sec, 0, &sc->hibernate_delay_sec }, |
| {} |
| }; |
| |
| (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, |
| NULL); |
| |
| /* use default values unless set */ |
| sc->allow[SLEEP_SUSPEND] = allow_suspend != 0; |
| sc->allow[SLEEP_HIBERNATE] = allow_hibernate != 0; |
| sc->allow[SLEEP_HYBRID_SLEEP] = allow_hybrid_sleep >= 0 ? allow_hybrid_sleep |
| : (allow_suspend != 0 && allow_hibernate != 0); |
| sc->allow[SLEEP_SUSPEND_THEN_HIBERNATE] = allow_s2h >= 0 ? allow_s2h |
| : (allow_suspend != 0 && allow_hibernate != 0); |
| |
| if (!sc->states[SLEEP_SUSPEND]) |
| sc->states[SLEEP_SUSPEND] = strv_new("mem", "standby", "freeze"); |
| if (!sc->modes[SLEEP_HIBERNATE]) |
| sc->modes[SLEEP_HIBERNATE] = strv_new("platform", "shutdown"); |
| if (!sc->states[SLEEP_HIBERNATE]) |
| sc->states[SLEEP_HIBERNATE] = strv_new("disk"); |
| if (!sc->modes[SLEEP_HYBRID_SLEEP]) |
| sc->modes[SLEEP_HYBRID_SLEEP] = strv_new("suspend", "platform", "shutdown"); |
| if (!sc->states[SLEEP_HYBRID_SLEEP]) |
| sc->states[SLEEP_HYBRID_SLEEP] = strv_new("disk"); |
| if (sc->hibernate_delay_sec == 0) |
| sc->hibernate_delay_sec = 2 * USEC_PER_HOUR; |
| |
| /* ensure values set for all required fields */ |
| if (!sc->states[SLEEP_SUSPEND] || !sc->modes[SLEEP_HIBERNATE] |
| || !sc->states[SLEEP_HIBERNATE] || !sc->modes[SLEEP_HYBRID_SLEEP] || !sc->states[SLEEP_HYBRID_SLEEP]) |
| return log_oom(); |
| |
| *ret_sleep_config = TAKE_PTR(sc); |
| |
| return 0; |
| } |
| |
| int can_sleep_state(char **types) { |
| _cleanup_free_ char *text = NULL; |
| int r; |
| |
| if (strv_isempty(types)) |
| return true; |
| |
| /* If /sys is read-only we cannot sleep */ |
| if (access("/sys/power/state", W_OK) < 0) { |
| log_debug_errno(errno, "/sys/power/state is not writable, cannot sleep: %m"); |
| return false; |
| } |
| |
| r = read_one_line_file("/sys/power/state", &text); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to read /sys/power/state, cannot sleep: %m"); |
| return false; |
| } |
| |
| const char *found; |
| r = string_contains_word_strv(text, NULL, types, &found); |
| if (r < 0) |
| return log_debug_errno(r, "Failed to parse /sys/power/state: %m"); |
| if (r > 0) |
| log_debug("Sleep mode \"%s\" is supported by the kernel.", found); |
| else if (DEBUG_LOGGING) { |
| _cleanup_free_ char *t = strv_join(types, "/"); |
| log_debug("Sleep mode %s not supported by the kernel, sorry.", strnull(t)); |
| } |
| return r; |
| } |
| |
| int can_sleep_disk(char **types) { |
| _cleanup_free_ char *text = NULL; |
| int r; |
| |
| if (strv_isempty(types)) |
| return true; |
| |
| /* If /sys is read-only we cannot sleep */ |
| if (access("/sys/power/disk", W_OK) < 0) { |
| log_debug_errno(errno, "/sys/power/disk is not writable: %m"); |
| return false; |
| } |
| |
| r = read_one_line_file("/sys/power/disk", &text); |
| if (r < 0) { |
| log_debug_errno(r, "Couldn't read /sys/power/disk: %m"); |
| return false; |
| } |
| |
| for (const char *p = text;;) { |
| _cleanup_free_ char *word = NULL; |
| |
| r = extract_first_word(&p, &word, NULL, 0); |
| if (r < 0) |
| return log_debug_errno(r, "Failed to parse /sys/power/disk: %m"); |
| if (r == 0) |
| break; |
| |
| char *s = word; |
| size_t l = strlen(s); |
| if (s[0] == '[' && s[l-1] == ']') { |
| s[l-1] = '\0'; |
| s++; |
| } |
| |
| if (strv_contains(types, s)) { |
| log_debug("Disk sleep mode \"%s\" is supported by the kernel.", s); |
| return true; |
| } |
| } |
| |
| if (DEBUG_LOGGING) { |
| _cleanup_free_ char *t = strv_join(types, "/"); |
| log_debug("Disk sleep mode %s not supported by the kernel, sorry.", strnull(t)); |
| } |
| return false; |
| } |
| |
| #define HIBERNATION_SWAP_THRESHOLD 0.98 |
| |
| SwapEntry* swap_entry_free(SwapEntry *se) { |
| if (!se) |
| return NULL; |
| |
| free(se->device); |
| free(se->type); |
| |
| return mfree(se); |
| } |
| |
| HibernateLocation* hibernate_location_free(HibernateLocation *hl) { |
| if (!hl) |
| return NULL; |
| |
| swap_entry_free(hl->swap); |
| |
| return mfree(hl); |
| } |
| |
| static int swap_device_to_device_id(const SwapEntry *swap, dev_t *ret_dev) { |
| struct stat sb; |
| int r; |
| |
| assert(swap); |
| assert(swap->device); |
| assert(swap->type); |
| |
| r = stat(swap->device, &sb); |
| if (r < 0) |
| return -errno; |
| |
| if (streq(swap->type, "partition")) { |
| if (!S_ISBLK(sb.st_mode)) |
| return -ENOTBLK; |
| |
| *ret_dev = sb.st_rdev; |
| return 0; |
| } |
| |
| return get_block_device(swap->device, ret_dev); |
| } |
| |
| /* |
| * Attempt to calculate the swap file offset on supported filesystems. On unsupported |
| * filesystems, a debug message is logged and ret_offset is set to UINT64_MAX. |
| */ |
| static int calculate_swap_file_offset(const SwapEntry *swap, uint64_t *ret_offset) { |
| _cleanup_close_ int fd = -1; |
| _cleanup_free_ struct fiemap *fiemap = NULL; |
| struct stat sb; |
| int r; |
| |
| assert(swap); |
| assert(swap->device); |
| assert(streq(swap->type, "file")); |
| |
| fd = open(swap->device, O_RDONLY|O_CLOEXEC|O_NOCTTY); |
| if (fd < 0) |
| return log_debug_errno(errno, "Failed to open swap file %s to determine on-disk offset: %m", swap->device); |
| |
| if (fstat(fd, &sb) < 0) |
| return log_debug_errno(errno, "Failed to stat %s: %m", swap->device); |
| |
| r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC); |
| if (r < 0) |
| return log_debug_errno(r, "Error checking %s for Btrfs filesystem: %m", swap->device); |
| if (r > 0) { |
| log_debug("%s: detection of swap file offset on Btrfs is not supported", swap->device); |
| *ret_offset = UINT64_MAX; |
| return 0; |
| } |
| |
| r = read_fiemap(fd, &fiemap); |
| if (r < 0) |
| return log_debug_errno(r, "Unable to read extent map for '%s': %m", swap->device); |
| |
| *ret_offset = fiemap->fm_extents[0].fe_physical / page_size(); |
| return 0; |
| } |
| |
| static int read_resume_files(dev_t *ret_resume, uint64_t *ret_resume_offset) { |
| _cleanup_free_ char *resume_str = NULL, *resume_offset_str = NULL; |
| uint64_t resume_offset = 0; |
| dev_t resume; |
| int r; |
| |
| r = read_one_line_file("/sys/power/resume", &resume_str); |
| if (r < 0) |
| return log_debug_errno(r, "Error reading /sys/power/resume: %m"); |
| |
| r = parse_dev(resume_str, &resume); |
| if (r < 0) |
| return log_debug_errno(r, "Error parsing /sys/power/resume device: %s: %m", resume_str); |
| |
| r = read_one_line_file("/sys/power/resume_offset", &resume_offset_str); |
| if (r == -ENOENT) |
| log_debug_errno(r, "Kernel does not support resume_offset; swap file offset detection will be skipped."); |
| else if (r < 0) |
| return log_debug_errno(r, "Error reading /sys/power/resume_offset: %m"); |
| else { |
| r = safe_atou64(resume_offset_str, &resume_offset); |
| if (r < 0) |
| return log_debug_errno(r, "Failed to parse value in /sys/power/resume_offset \"%s\": %m", resume_offset_str); |
| } |
| |
| if (resume_offset > 0 && resume == 0) |
| log_debug("Warning: found /sys/power/resume_offset==%" PRIu64 ", but /sys/power/resume unset. Misconfiguration?", |
| resume_offset); |
| |
| *ret_resume = resume; |
| *ret_resume_offset = resume_offset; |
| |
| return 0; |
| } |
| |
| /* |
| * Determine if the HibernateLocation matches the resume= (device) and resume_offset= (file). |
| */ |
| static bool location_is_resume_device(const HibernateLocation *location, dev_t sys_resume, uint64_t sys_offset) { |
| if (!location) |
| return false; |
| |
| return sys_resume > 0 && |
| sys_resume == location->devno && |
| (sys_offset == location->offset || (sys_offset > 0 && location->offset == UINT64_MAX)); |
| } |
| |
| /* |
| * Attempt to find the hibernation location by parsing /proc/swaps, /sys/power/resume, and |
| * /sys/power/resume_offset. |
| * |
| * Returns: |
| * 1 - Values are set in /sys/power/resume and /sys/power/resume_offset. |
| * ret_hibernate_location will represent matching /proc/swap entry if identified or NULL if not. |
| * |
| * 0 - No values are set in /sys/power/resume and /sys/power/resume_offset. |
| ret_hibernate_location will represent the highest priority swap with most remaining space discovered in /proc/swaps. |
| * |
| * Negative value in the case of error. |
| */ |
| int find_hibernate_location(HibernateLocation **ret_hibernate_location) { |
| _cleanup_fclose_ FILE *f = NULL; |
| _cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL; |
| dev_t sys_resume = 0; /* Unnecessary initialization to appease gcc */ |
| uint64_t sys_offset = 0; |
| bool resume_match = false; |
| int r; |
| |
| /* read the /sys/power/resume & /sys/power/resume_offset values */ |
| r = read_resume_files(&sys_resume, &sys_offset); |
| if (r < 0) |
| return r; |
| |
| f = fopen("/proc/swaps", "re"); |
| if (!f) { |
| log_debug_errno(errno, "Failed to open /proc/swaps: %m"); |
| return errno == ENOENT ? -EOPNOTSUPP : -errno; /* Convert swap not supported to a recognizable error */ |
| } |
| |
| (void) fscanf(f, "%*s %*s %*s %*s %*s\n"); |
| for (unsigned i = 1;; i++) { |
| _cleanup_(swap_entry_freep) SwapEntry *swap = NULL; |
| uint64_t swap_offset = 0; |
| int k; |
| |
| swap = new0(SwapEntry, 1); |
| if (!swap) |
| return -ENOMEM; |
| |
| k = fscanf(f, |
| "%ms " /* device/file */ |
| "%ms " /* type of swap */ |
| "%" PRIu64 /* swap size */ |
| "%" PRIu64 /* used */ |
| "%i\n", /* priority */ |
| &swap->device, &swap->type, &swap->size, &swap->used, &swap->priority); |
| if (k == EOF) |
| break; |
| if (k != 5) { |
| log_debug("Failed to parse /proc/swaps:%u, ignoring", i); |
| continue; |
| } |
| |
| if (streq(swap->type, "file")) { |
| if (endswith(swap->device, "\\040(deleted)")) { |
| log_debug("Ignoring deleted swap file '%s'.", swap->device); |
| continue; |
| } |
| |
| r = calculate_swap_file_offset(swap, &swap_offset); |
| if (r < 0) |
| return r; |
| |
| } else if (streq(swap->type, "partition")) { |
| const char *fn; |
| |
| fn = path_startswith(swap->device, "/dev/"); |
| if (fn && startswith(fn, "zram")) { |
| log_debug("%s: ignoring zram swap", swap->device); |
| continue; |
| } |
| |
| } else { |
| log_debug("%s: swap type %s is unsupported for hibernation, ignoring", swap->device, swap->type); |
| continue; |
| } |
| |
| /* prefer resume device or highest priority swap with most remaining space */ |
| if (sys_resume == 0) { |
| if (hibernate_location && swap->priority < hibernate_location->swap->priority) { |
| log_debug("%s: ignoring device with lower priority", swap->device); |
| continue; |
| } |
| if (hibernate_location && |
| (swap->priority == hibernate_location->swap->priority |
| && swap->size - swap->used < hibernate_location->swap->size - hibernate_location->swap->used)) { |
| log_debug("%s: ignoring device with lower usable space", swap->device); |
| continue; |
| } |
| } |
| |
| dev_t swap_device; |
| r = swap_device_to_device_id(swap, &swap_device); |
| if (r < 0) |
| return log_debug_errno(r, "%s: failed to query device number: %m", swap->device); |
| if (swap_device == 0) |
| return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), "%s: not backed by block device.", swap->device); |
| |
| hibernate_location = hibernate_location_free(hibernate_location); |
| hibernate_location = new(HibernateLocation, 1); |
| if (!hibernate_location) |
| return -ENOMEM; |
| |
| *hibernate_location = (HibernateLocation) { |
| .devno = swap_device, |
| .offset = swap_offset, |
| .swap = TAKE_PTR(swap), |
| }; |
| |
| /* if the swap is the resume device, stop the loop */ |
| if (location_is_resume_device(hibernate_location, sys_resume, sys_offset)) { |
| log_debug("%s: device matches configured resume settings.", hibernate_location->swap->device); |
| resume_match = true; |
| break; |
| } |
| |
| log_debug("%s: is a candidate device.", hibernate_location->swap->device); |
| } |
| |
| /* We found nothing at all */ |
| if (!hibernate_location) |
| return log_debug_errno(SYNTHETIC_ERRNO(ENOSYS), |
| "No possible swap partitions or files suitable for hibernation were found in /proc/swaps."); |
| |
| /* resume= is set but a matching /proc/swaps entry was not found */ |
| if (sys_resume != 0 && !resume_match) |
| return log_debug_errno(SYNTHETIC_ERRNO(ENOSYS), |
| "No swap partitions or files matching resume config were found in /proc/swaps."); |
| |
| if (hibernate_location->offset == UINT64_MAX) { |
| if (sys_offset == 0) |
| return log_debug_errno(SYNTHETIC_ERRNO(ENOSYS), "Offset detection failed and /sys/power/resume_offset is not set."); |
| |
| hibernate_location->offset = sys_offset; |
| } |
| |
| if (resume_match) |
| log_debug("Hibernation will attempt to use swap entry with path: %s, device: %u:%u, offset: %" PRIu64 ", priority: %i", |
| hibernate_location->swap->device, major(hibernate_location->devno), minor(hibernate_location->devno), |
| hibernate_location->offset, hibernate_location->swap->priority); |
| else |
| log_debug("/sys/power/resume is not configured; attempting to hibernate with path: %s, device: %u:%u, offset: %" PRIu64 ", priority: %i", |
| hibernate_location->swap->device, major(hibernate_location->devno), minor(hibernate_location->devno), |
| hibernate_location->offset, hibernate_location->swap->priority); |
| |
| *ret_hibernate_location = TAKE_PTR(hibernate_location); |
| |
| if (resume_match) |
| return 1; |
| |
| return 0; |
| } |
| |
| static bool enough_swap_for_hibernation(void) { |
| _cleanup_free_ char *active = NULL; |
| _cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL; |
| unsigned long long act = 0; |
| int r; |
| |
| if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0) |
| return true; |
| |
| r = find_hibernate_location(&hibernate_location); |
| if (r < 0) |
| return false; |
| |
| /* If /sys/power/{resume,resume_offset} is configured but a matching entry |
| * could not be identified in /proc/swaps, user is likely using Btrfs with a swapfile; |
| * return true and let the system attempt hibernation. |
| */ |
| if (r > 0 && !hibernate_location) { |
| log_debug("Unable to determine remaining swap space; hibernation may fail"); |
| return true; |
| } |
| |
| if (!hibernate_location) |
| return false; |
| |
| r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m"); |
| return false; |
| } |
| |
| r = safe_atollu(active, &act); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m", active); |
| return false; |
| } |
| |
| r = act <= (hibernate_location->swap->size - hibernate_location->swap->used) * HIBERNATION_SWAP_THRESHOLD; |
| log_debug("%s swap for hibernation, Active(anon)=%llu kB, size=%" PRIu64 " kB, used=%" PRIu64 " kB, threshold=%.2g%%", |
| r ? "Enough" : "Not enough", act, hibernate_location->swap->size, hibernate_location->swap->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)); |
| |
| 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, 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, |
| 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 int can_sleep_internal(const SleepConfig *sleep_config, SleepOperation operation, bool check_allowed); |
| |
| static bool can_s2h(const SleepConfig *sleep_config) { |
| |
| static const SleepOperation operations[] = { |
| SLEEP_SUSPEND, |
| SLEEP_HIBERNATE, |
| }; |
| |
| int r; |
| |
| if (!clock_supported(CLOCK_BOOTTIME_ALARM)) { |
| log_debug("CLOCK_BOOTTIME_ALARM is not supported."); |
| return false; |
| } |
| |
| for (size_t i = 0; i < ELEMENTSOF(operations); i++) { |
| r = can_sleep_internal(sleep_config, operations[i], false); |
| if (IN_SET(r, 0, -ENOSPC)) { |
| log_debug("Unable to %s system.", sleep_operation_to_string(operations[i])); |
| return false; |
| } |
| if (r < 0) |
| return log_debug_errno(r, "Failed to check if %s is possible: %m", sleep_operation_to_string(operations[i])); |
| } |
| |
| return true; |
| } |
| |
| static int can_sleep_internal( |
| const SleepConfig *sleep_config, |
| SleepOperation operation, |
| bool check_allowed) { |
| |
| assert(operation >= 0); |
| assert(operation < _SLEEP_OPERATION_MAX); |
| |
| if (check_allowed && !sleep_config->allow[operation]) { |
| log_debug("Sleep mode \"%s\" is disabled by configuration.", sleep_operation_to_string(operation)); |
| return false; |
| } |
| |
| if (operation == SLEEP_SUSPEND_THEN_HIBERNATE) |
| return can_s2h(sleep_config); |
| |
| if (can_sleep_state(sleep_config->states[operation]) <= 0 || |
| can_sleep_disk(sleep_config->modes[operation]) <= 0) |
| return false; |
| |
| if (operation == SLEEP_SUSPEND) |
| return true; |
| |
| if (!enough_swap_for_hibernation()) |
| return -ENOSPC; |
| |
| return true; |
| } |
| |
| int can_sleep(SleepOperation operation) { |
| _cleanup_(free_sleep_configp) SleepConfig *sleep_config = NULL; |
| int r; |
| |
| r = parse_sleep_config(&sleep_config); |
| if (r < 0) |
| return r; |
| |
| return can_sleep_internal(sleep_config, operation, true); |
| } |
| |
| SleepConfig* free_sleep_config(SleepConfig *sc) { |
| if (!sc) |
| return NULL; |
| |
| for (SleepOperation i = 0; i < _SLEEP_OPERATION_MAX; i++) { |
| strv_free(sc->modes[i]); |
| strv_free(sc->states[i]); |
| } |
| |
| return mfree(sc); |
| } |
| |
| static const char* const sleep_operation_table[_SLEEP_OPERATION_MAX] = { |
| [SLEEP_SUSPEND] = "suspend", |
| [SLEEP_HIBERNATE] = "hibernate", |
| [SLEEP_HYBRID_SLEEP] = "hybrid-sleep", |
| [SLEEP_SUSPEND_THEN_HIBERNATE] = "suspend-then-hibernate", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(sleep_operation, SleepOperation); |
