#include <unistd.h>
#include "alloc-util.h"
+#include "btrfs-util.h"
#include "conf-parser.h"
#include "def.h"
#include "env-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "sleep-config.h"
+#include "stdio-util.h"
#include "string-util.h"
#include "strv.h"
#include "time-util.h"
#define HIBERNATION_SWAP_THRESHOLD 0.98
-/* entry in /proc/swaps */
-typedef struct SwapEntry {
- char *device;
- char *type;
- uint64_t size;
- uint64_t used;
- int priority;
-} SwapEntry;
-
-static SwapEntry* swap_entry_free(SwapEntry *se) {
+SwapEntry* swap_entry_free(SwapEntry *se) {
if (!se)
return NULL;
return mfree(se);
}
-DEFINE_TRIVIAL_CLEANUP_FUNC(SwapEntry*, swap_entry_free);
+HibernateLocation* hibernate_location_free(HibernateLocation *hl) {
+ if (!hl)
+ return NULL;
+
+ swap_entry_free(hl->swap);
+ free(hl->resume);
+
+ return mfree(hl);
+}
+
+static int swap_device_to_major_minor(const SwapEntry *swap, char **ret) {
+ _cleanup_free_ char *major_minor = NULL;
+ _cleanup_close_ int fd = -1;
+ struct stat sb;
+ dev_t swap_dev;
+ int r;
+
+ assert(swap);
+ assert(swap->device);
+ assert(swap->type);
+
+ fd = open(swap->device, O_RDONLY | O_CLOEXEC | O_NONBLOCK);
+ if (fd < 0)
+ return log_debug_errno(errno, "Unable to open '%s': %m", swap->device);
+
+ r = fstat(fd, &sb);
+ if (r < 0)
+ return log_debug_errno(errno, "Unable to stat %s: %m", swap->device);
+
+ swap_dev = streq(swap->type, "partition") ? sb.st_rdev : sb.st_dev;
+ if (asprintf(&major_minor, "%u:%u", major(swap_dev), minor(swap_dev)) < 0)
+ return log_oom();
+
+ *ret = TAKE_PTR(major_minor);
+
+ return 0;
+}
+
+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, btrfs;
+
+ assert(swap);
+ assert(swap->device);
+ assert(streq(swap->type, "file"));
+
+ fd = open(swap->device, O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (!fd)
+ return log_error_errno(errno, "Failed to open %s: %m", swap->device);
+
+ r = fstat(fd, &sb);
+ if (r < 0)
+ return log_error_errno(errno, "Failed to stat %s: %m", swap->device);
+
+ btrfs = btrfs_is_filesystem(fd);
+ if (btrfs < 0)
+ return log_error_errno(r, "Error checking %s for Btrfs filesystem: %m", swap->device);
+ else if (btrfs > 0) {
+ log_debug("Detection of swap file offset on Btrfs is not supported: %s; skipping", swap->device);
+ *ret_offset = 0;
+ 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(char **ret_resume, uint64_t *ret_resume_offset) {
+ _cleanup_free_ char *resume, *resume_offset_str = NULL;
+ uint64_t resume_offset = 0;
+ int r;
+
+ r = read_one_line_file("/sys/power/resume", &resume);
+ if (r < 0)
+ return log_debug_errno(r, "Error reading from /sys/power/resume: %m");
+
+ r = read_one_line_file("/sys/power/resume_offset", &resume_offset_str);
+ if (r < 0) {
+ if (r == -ENOENT)
+ log_debug("Kernel does not support resume_offset; swap file offset detection will be skipped.");
+ else
+ return log_debug_errno(r, "Error reading from /sys/power/resume_offset: %m");
+ } else {
+ r = safe_atou64(resume_offset_str, &resume_offset);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse 'resume_offset' from string: %s", resume_offset_str);
+ }
+
+ if (resume_offset > 0 && streq(*ret_resume, "0:0")) {
+ log_debug("Found offset in /sys/power/resume_offset: %" PRIu64 "; no device id found in /sys/power/resume; ignoring resume_offset", resume_offset);
+ resume_offset = 0;
+ }
+
+ *ret_resume = TAKE_PTR(resume);
+ *ret_resume_offset = resume_offset;
+
+ return 0;
+}
+
+static bool location_is_resume_device(const HibernateLocation *location, const char *sys_resume, const uint64_t sys_offset) {
+ assert(location);
+ assert(location->resume);
+ assert(sys_resume);
+
+ return streq(sys_resume, location->resume) && sys_offset == location->resume_offset;
+}
-int find_hibernate_location(char **device, char **type, uint64_t *size, uint64_t *used) {
+/*
+ * Attempt to find the hibernation location by parsing /proc/swaps, /sys/power/resume, and
+ * /sys/power/resume_offset.
+ *
+ * Returns:
+ * 1 - HibernateLocation matches values found in /sys/power/resume & /sys/power/resume_offset
+ * 0 - HibernateLocation is highest priority swap with most remaining space; no valid values exist in /sys/power/resume & /sys/power/resume_offset
+ * negative value in the case of error
+ */
+int find_hibernate_location(HibernateLocation **ret_hibernate_location) {
_cleanup_fclose_ FILE *f;
- _cleanup_(swap_entry_freep) SwapEntry *selected_swap = NULL;
+ _cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL;
+ _cleanup_free_ char *sys_resume = NULL;
+ uint64_t sys_offset = 0;
unsigned i;
+ 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) {
}
(void) fscanf(f, "%*s %*s %*s %*s %*s\n");
-
for (i = 1;; i++) {
_cleanup_(swap_entry_freep) SwapEntry *swap = NULL;
+ uint64_t swap_offset = 0;
int k;
swap = new0(SwapEntry, 1);
}
if (streq(swap->type, "file")) {
-
if (endswith(swap->device, "\\040(deleted)")) {
log_warning("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;
log_debug("Ignoring compressed RAM swap device '%s'.", swap->device);
continue;
}
+ } else {
+ log_debug("Swap type %s is unsupported for hibernation: %s; skipping", swap->type, swap->device);
+ continue;
}
- /* prefer highest priority or swap with most remaining space when same priority */
- if (!selected_swap || swap->priority > selected_swap->priority
- || ((swap->priority == selected_swap->priority)
- && (swap->size - swap->used) > (selected_swap->size - selected_swap->used))) {
- selected_swap = swap_entry_free(selected_swap);
- selected_swap = TAKE_PTR(swap);
+ /* prefer resume device or highest priority swap with most remaining space */
+ if (!hibernate_location || swap->priority > hibernate_location->swap->priority
+ || ((swap->priority == hibernate_location->swap->priority)
+ && (swap->size - swap->used) > (hibernate_location->swap->size - hibernate_location->swap->used))) {
+
+ _cleanup_free_ char *swap_device_id = NULL;
+ r = swap_device_to_major_minor(swap, &swap_device_id);
+ if (r < 0)
+ return r;
+
+ hibernate_location = hibernate_location_free(hibernate_location);
+ hibernate_location = new0(HibernateLocation, 1);
+ if (!hibernate_location)
+ return log_oom();
+
+ hibernate_location->resume = TAKE_PTR(swap_device_id);
+ hibernate_location->resume_offset = swap_offset;
+ hibernate_location->swap = TAKE_PTR(swap);
+
+ /* if the swap is the resume device, stop looping swaps */
+ if (location_is_resume_device(hibernate_location, sys_resume, sys_offset))
+ break;
}
}
- if (!selected_swap)
- return log_debug_errno(SYNTHETIC_ERRNO(ENOSYS), "No swap partitions or files were found.");
+ if (!hibernate_location)
+ return log_debug_errno(SYNTHETIC_ERRNO(ENOSYS), "No swap partitions or files were found");
+
+ if (!streq(sys_resume, "0:0") && !location_is_resume_device(hibernate_location, sys_resume, sys_offset))
+ return log_warning_errno(SYNTHETIC_ERRNO(ENOSYS), "/sys/power/resume and /sys/power/resume_offset has no matching entry in /proc/swaps; Hibernation will fail: resume=%s, resume_offset=%" PRIu64,
+ sys_resume, sys_offset);
+
+ log_debug("Hibernation will attempt to use swap entry with path: %s, device: %s, offset: %" PRIu64 ", priority: %i",
+ hibernate_location->swap->device, hibernate_location->resume, hibernate_location->resume_offset, hibernate_location->swap->priority);
- /* use the swap entry with the highest priority */
- if (device)
- *device = TAKE_PTR(selected_swap->device);
- if (type)
- *type = TAKE_PTR(selected_swap->type);
- if (size)
- *size = selected_swap->size;
- if (used)
- *used = selected_swap->used;
+ *ret_hibernate_location = TAKE_PTR(hibernate_location);
- log_debug("Highest priority swap entry found %s: %i", selected_swap->device, selected_swap->priority);
+ if (location_is_resume_device(*ret_hibernate_location, sys_resume, sys_offset))
+ 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;
- uint64_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);
+ r = find_hibernate_location(&hibernate_location);
if (r < 0)
return false;
return false;
}
- r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
+ 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, size, used, 100*HIBERNATION_SWAP_THRESHOLD);
+ r ? "Enough" : "Not enough", act, hibernate_location->swap->size, hibernate_location->swap->used, 100*HIBERNATION_SWAP_THRESHOLD);
return r;
}
STATIC_DESTRUCTOR_REGISTER(arg_verb, freep);
-static int write_hibernate_location_info(void) {
- _cleanup_free_ char *device = NULL, *type = NULL;
- _cleanup_free_ struct fiemap *fiemap = NULL;
+static int write_hibernate_location_info(const HibernateLocation *hibernate_location) {
char offset_str[DECIMAL_STR_MAX(uint64_t)];
- char device_str[DECIMAL_STR_MAX(uint64_t)];
- _cleanup_close_ int fd = -1;
- struct stat stb;
- uint64_t offset;
int r;
- r = find_hibernate_location(&device, &type, NULL, NULL);
+ assert(hibernate_location);
+ assert(hibernate_location->swap);
+ assert(hibernate_location->resume);
+
+ r = write_string_file("/sys/power/resume", hibernate_location->resume, WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
- return log_debug_errno(r, "Unable to find hibernation location: %m");
+ return log_debug_errno(r, "Failed to write partition device to /sys/power/resume for '%s': '%s': %m",
+ hibernate_location->swap->device, hibernate_location->resume);
- /* if it's a swap partition, we just write the disk to /sys/power/resume */
- if (streq(type, "partition")) {
- r = write_string_file("/sys/power/resume", device, WRITE_STRING_FILE_DISABLE_BUFFER);
- if (r < 0)
- return log_debug_errno(r, "Failed to write partition device to /sys/power/resume: %m");
+ log_debug("Wrote resume= value for %s to /sys/power/resume: %s", hibernate_location->swap->device, hibernate_location->resume);
+ /* if it's a swap partition, we're done */
+ if (streq(hibernate_location->swap->type, "partition"))
return r;
- }
- if (!streq(type, "file"))
+
+ if (!streq(hibernate_location->swap->type, "file"))
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
- "Invalid hibernate type: %s", type);
+ "Invalid hibernate type: %s", hibernate_location->swap->type);
/* Only available in 4.17+ */
- if (access("/sys/power/resume_offset", W_OK) < 0) {
+ if (hibernate_location->resume_offset > 0 && access("/sys/power/resume_offset", W_OK) < 0) {
if (errno == ENOENT) {
- log_debug("Kernel too old, can't configure resume offset, ignoring.");
+ log_debug("Kernel too old, can't configure resume_offset for %s, ignoring: %" PRIu64,
+ hibernate_location->swap->device, hibernate_location->resume_offset);
return 0;
}
return log_debug_errno(errno, "/sys/power/resume_offset not writeable: %m");
}
- fd = open(device, O_RDONLY | O_CLOEXEC | O_NONBLOCK);
- if (fd < 0)
- return log_debug_errno(errno, "Unable to open '%s': %m", device);
- r = fstat(fd, &stb);
- if (r < 0)
- return log_debug_errno(errno, "Unable to stat %s: %m", device);
-
- r = btrfs_is_filesystem(fd);
- if (r < 0)
- return log_error_errno(r, "Error checking %s for Btrfs filesystem: %m", device);
-
- if (r)
- return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
- "Unable to calculate swapfile offset when using Btrfs: %s", device);
-
- r = read_fiemap(fd, &fiemap);
- if (r < 0)
- return log_debug_errno(r, "Unable to read extent map for '%s': %m", device);
- if (fiemap->fm_mapped_extents == 0)
- return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
- "No extents found in '%s'", device);
-
- offset = fiemap->fm_extents[0].fe_physical / page_size();
- xsprintf(offset_str, "%" PRIu64, offset);
+ xsprintf(offset_str, "%" PRIu64, hibernate_location->resume_offset);
r = write_string_file("/sys/power/resume_offset", offset_str, WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
- return log_debug_errno(r, "Failed to write offset '%s': %m", offset_str);
-
- log_debug("Wrote calculated resume_offset value to /sys/power/resume_offset: %s", offset_str);
-
- xsprintf(device_str, "%lx", (unsigned long)stb.st_dev);
- r = write_string_file("/sys/power/resume", device_str, WRITE_STRING_FILE_DISABLE_BUFFER);
- if (r < 0)
- return log_debug_errno(r, "Failed to write device '%s': %m", device_str);
+ return log_debug_errno(r, "Failed to write swap file offset to /sys/power/resume_offset for '%s': '%s': %m",
+ hibernate_location->swap->device, offset_str);
- log_debug("Wrote device id to /sys/power/resume: %s", device_str);
+ log_debug("Wrote resume_offset= value for %s to /sys/power/resume_offset: %s", hibernate_location->swap->device, offset_str);
return 0;
}
return r;
}
-static int configure_hibernation(void) {
- _cleanup_free_ char *resume = NULL, *resume_offset = NULL;
- int r;
-
- /* check for proper hibernation configuration */
- r = read_one_line_file("/sys/power/resume", &resume);
- if (r < 0)
- return log_debug_errno(r, "Error reading from /sys/power/resume: %m");
-
- r = read_one_line_file("/sys/power/resume_offset", &resume_offset);
- if (r < 0)
- return log_debug_errno(r, "Error reading from /sys/power/resume_offset: %m");
-
- if (!streq(resume_offset, "0") && !streq(resume, "0:0")) {
- log_debug("Hibernating using device id and offset read from /sys/power/resume: %s and /sys/power/resume_offset: %s", resume, resume_offset);
- return 0;
- } else if (!streq(resume, "0:0")) {
- log_debug("Hibernating using device id read from /sys/power/resume: %s", resume);
- return 0;
- } else if (!streq(resume_offset, "0"))
- log_debug("Found offset in /sys/power/resume_offset: %s; no device id found in /sys/power/resume; ignoring offset", resume_offset);
-
- /* if hibernation is not properly configured, attempt to calculate and write values */
- return write_hibernate_location_info();
-}
-
static int execute(char **modes, char **states) {
char *arguments[] = {
NULL,
NULL
};
- int r;
_cleanup_fclose_ FILE *f = NULL;
+ _cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL;
+ int r;
/* This file is opened first, so that if we hit an error,
* we can abort before modifying any state. */
/* Configure the hibernation mode */
if (!strv_isempty(modes)) {
- r = configure_hibernation();
+ r = find_hibernate_location(&hibernate_location);
if (r < 0)
- return log_error_errno(r, "Failed to prepare for hibernation: %m");
+ return r;
+ else if (r == 0) {
+ r = write_hibernate_location_info(hibernate_location);
+ if (r < 0)
+ return log_error_errno(r, "Failed to prepare for hibernation: %m");
+ }
r = write_mode(modes);
if (r < 0)
projects / thirdparty / systemd.git / commitdiff
