diff options
Diffstat (limited to 'src/shared')
-rw-r--r-- | src/shared/sleep-config.c | 95 |
1 files changed, 92 insertions, 3 deletions
diff --git a/src/shared/sleep-config.c b/src/shared/sleep-config.c index 347858a12..0d80bf313 100644 --- a/src/shared/sleep-config.c +++ b/src/shared/sleep-config.c @@ -13,6 +13,7 @@ //#include <unistd.h> #include "alloc-util.h" +//#include "bootspec.h" //#include "conf-parser.h" //#include "def.h" //#include "env-util.h" @@ -22,6 +23,7 @@ //#include "macro.h" #include "parse-util.h" //#include "path-util.h" +//#include "proc-cmdline.h" #include "sleep-config.h" #include "string-util.h" #include "strv.h" @@ -270,12 +272,94 @@ static bool enough_swap_for_hibernation(void) { } 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); + log_debug("%s swap for hibernation, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%", + r ? "Enough" : "Not enough", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD); return r; } +static int check_resume_keys(const char *key, const char *value, void *data) { + assert_se(key); + assert_se(data); + + int *resume = data; + + if (*resume == 0) + /* Exit if we already know we can't resume. */ + return 0; + + if (streq(key, "noresume")) { + log_debug("Found \"noresume\" on the kernel command line, hibernation is disabled."); + *resume = 0; + + } else if (streq(key, "resume")) { + log_debug("Found resume= option on the kernel command line, hibernation is possible."); + *resume = 1; + } + + return 0; +} + +static int resume_configured_in_options(const char *options) { + int resume = -1, r; + + /* We don't use PROC_CMDLINE_STRIP_RD_PREFIX here, so rd.resume is *not* supported. */ + r = proc_cmdline_parse_given(options, check_resume_keys, &resume, 0); + if (r < 0) + return r; + + if (resume < 0) + log_debug("Couldn't find resume= option, hibernation is disabled."); + return resume > 0; +} + +static int resume_configured(void) { + _cleanup_(boot_config_free) BootConfig config = {}; + const BootEntry *e; + int r; + + /* Check whether a valid resume= option is present. If possible, we query the boot options + * for the default kernel. If the system is not using sd-boot, fall back to checking the + * current kernel command line. This is not perfect, but should suffice for most cases. */ + + r = find_default_boot_entry(NULL, NULL, &config, &e); + if (r == -ENOKEY) + log_debug_errno(r, "Cannot find the ESP partition mount point, falling back to other checks."); + else if (r < 0) + return log_debug_errno(r, "Cannot read boot configuration from ESP, assuming hibernation is not possible."); + else { + _cleanup_free_ char *options = NULL; + + options = strv_join(e->options, " "); + if (!options) + return log_oom(); + + r = resume_configured_in_options(options); + if (r < 0) + return log_error_errno(r, "Failed to parse kernel options in \"%s\": %m", + strnull(e->path)); + return r; + } + + /* If we can't figure out the default boot entry, let's fall back to current kernel cmdline */ + _cleanup_free_ char *line = NULL; + r = proc_cmdline(&line); + if (IN_SET(r, -EPERM, -EACCES, -ENOENT)) + log_debug_errno(r, "Cannot access /proc/cmdline: %m"); + else if (r < 0) + return log_error_errno(r, "Failed to query /proc/cmdline: %m"); + else { + r = resume_configured_in_options(line); + if (r < 0) + return log_error_errno(r, "Failed to parse kernel proc cmdline: %m"); + + return r; + } + + log_debug("Couldn't detect any resume mechanism, hibernation is disabled."); + return false; +} + int read_fiemap(int fd, struct fiemap **ret) { _cleanup_free_ struct fiemap *fiemap = NULL, *result_fiemap = NULL; struct stat statinfo; @@ -378,10 +462,10 @@ static bool can_s2h(Manager *m) { FOREACH_STRING(p, "suspend", "hibernate") { #if 0 /// elogind must transport a pointer to its managers instance r = can_sleep(p); + if (IN_SET(r, 0, -ENOSPC, -EADV)) { #else r = can_sleep(m, p); #endif // 0 - if (IN_SET(r, 0, -ENOSPC)) { log_debug("Unable to %s system.", p); return false; } @@ -433,5 +517,10 @@ int can_sleep(Manager *m, const char *verb) { if (!enough_swap_for_hibernation()) return -ENOSPC; + r = resume_configured(); + if (r <= 0) + /* We squash all errors (e.g. EPERM) into a single value for reporting. */ + return -EADV; + return true; } |