#define HIBERNATION_SWAP_THRESHOLD 0.98
-SwapEntry* swap_entry_free(SwapEntry *se) {
- if (!se)
- return NULL;
+void hibernation_device_done(HibernationDevice *device) {
+ assert(device);
- free(se->path);
-
- return mfree(se);
+ free(device->path);
}
-HibernateLocation* hibernate_location_free(HibernateLocation *hl) {
- if (!hl)
- return NULL;
+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));
- swap_entry_free(hl->swap);
+ assert(fd >= 0);
+ assert(ret);
- return mfree(hl);
-}
+ 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;
-static int swap_device_to_devnum(const SwapEntry *swap, dev_t *ret_dev) {
- _cleanup_close_ int fd = -EBADF;
- struct stat sb;
- int r;
+ /* 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;
- assert(swap);
- assert(swap->path);
+ result_fiemap = malloc_multiply(n_extra, sizeof(struct fiemap_extent));
+ if (!result_fiemap)
+ return -ENOMEM;
- fd = open(swap->path, O_CLOEXEC|O_PATH);
- if (fd < 0)
- return -errno;
+ /* 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,
+ };
- if (fstat(fd, &sb) < 0)
- return -errno;
+ /* 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");
- if (swap->type == SWAP_BLOCK) {
- if (!S_ISBLK(sb.st_mode))
- return -ENOTBLK;
+ /* Nothing to process */
+ if (fiemap->fm_mapped_extents == 0)
+ break;
- *ret_dev = sb.st_rdev;
- return 0;
- }
+ /* 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;
- r = stat_verify_regular(&sb);
- if (r < 0)
- return r;
+ fiemap->fm_extent_count = fiemap->fm_mapped_extents;
+ fiemap->fm_mapped_extents = 0;
- return get_block_device_fd(fd, ret_dev);
-}
+ if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0)
+ return log_debug_errno(errno, "Failed to read extents: %m");
-/*
- * 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 = -EBADF;
- _cleanup_free_ struct fiemap *fiemap = NULL;
- int r;
+ /* 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;
- assert(swap);
- assert(swap->path);
- assert(swap->type == SWAP_FILE);
- assert(ret_offset);
+ memcpy(result_fiemap->fm_extents + result_extents,
+ fiemap->fm_extents,
+ sizeof(struct fiemap_extent) * fiemap->fm_mapped_extents);
- fd = open(swap->path, 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->path);
+ result_extents += fiemap->fm_mapped_extents;
- r = fd_verify_regular(fd);
- if (r < 0)
- return log_debug_errno(r, "Selected swap file is not a regular file.");
+ /* Highly unlikely that it is zero */
+ if (_likely_(fiemap->fm_mapped_extents > 0)) {
+ uint32_t i = fiemap->fm_mapped_extents - 1;
- 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->path);
- if (r > 0) {
- log_debug("%s: detection of swap file offset on Btrfs is not supported", swap->path);
- *ret_offset = UINT64_MAX;
- return 0;
- }
+ fiemap_start = fiemap->fm_extents[i].fe_logical +
+ fiemap->fm_extents[i].fe_length;
- r = read_fiemap(fd, &fiemap);
- if (r < 0)
- return log_debug_errno(r, "Unable to read extent map for '%s': %m", swap->path);
+ if (fiemap->fm_extents[i].fe_flags & FIEMAP_EXTENT_LAST)
+ break;
+ }
+ }
- *ret_offset = fiemap->fm_extents[0].fe_physical / page_size();
+ memcpy(result_fiemap, fiemap, sizeof(struct fiemap));
+ result_fiemap->fm_mapped_extents = result_extents;
+ *ret = TAKE_PTR(result_fiemap);
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;
- dev_t resume;
+static int read_resume_config(dev_t *ret_devno, uint64_t *ret_offset) {
+ _cleanup_free_ char *devno_str = NULL, *offset_str = NULL;
+ uint64_t offset;
+ dev_t devno;
int r;
- assert(ret_resume);
- assert(ret_resume_offset);
+ assert(ret_devno);
+ assert(ret_offset);
- r = read_one_line_file("/sys/power/resume", &resume_str);
+ r = read_one_line_file("/sys/power/resume", &devno_str);
if (r < 0)
- return log_debug_errno(r, "Error reading /sys/power/resume: %m");
+ return log_debug_errno(r, "Failed to read /sys/power/resume: %m");
- r = parse_devnum(resume_str, &resume);
+ r = parse_devnum(devno_str, &devno);
if (r < 0)
- return log_debug_errno(r, "Error parsing /sys/power/resume device: %s: %m", resume_str);
+ return log_debug_errno(r, "Failed to parse /sys/power/resume devno '%s': %m", devno_str);
- r = read_one_line_file("/sys/power/resume_offset", &resume_offset_str);
+ r = read_one_line_file("/sys/power/resume_offset", &offset_str);
if (r == -ENOENT) {
- log_debug_errno(r, "Kernel does not support resume_offset; swap file offset detection will be skipped.");
- resume_offset = 0;
+ log_debug_errno(r, "Kernel does not expose resume_offset, skipping.");
+ offset = UINT64_MAX;
} else if (r < 0)
- return log_debug_errno(r, "Error reading /sys/power/resume_offset: %m");
+ return log_debug_errno(r, "Failed to read /sys/power/resume_offset: %m");
else {
- r = safe_atou64(resume_offset_str, &resume_offset);
+ r = safe_atou64(offset_str, &offset);
if (r < 0)
- return log_debug_errno(r, "Failed to parse value in /sys/power/resume_offset \"%s\": %m", resume_offset_str);
+ return log_debug_errno(r,
+ "Failed to parse /sys/power/resume_offset '%s': %m", 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);
+ if (devno == 0 && offset > 0 && offset != UINT64_MAX)
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Found resume_offset=%" PRIu64 " but resume= is unset, refusing.", offset);
+
+ *ret_devno = devno;
+ *ret_offset = 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;
+/* entry in /proc/swaps */
+typedef struct SwapEntry {
+ char *path;
+ bool swapfile;
+
+ uint64_t size;
+ uint64_t used;
+ int priority;
+
+ /* Not present in original entry */
+ dev_t devno;
+ uint64_t offset;
+} SwapEntry;
+
+typedef struct SwapEntries {
+ SwapEntry *swaps;
+ size_t n_swaps;
+} SwapEntries;
+
+static void swap_entry_done(SwapEntry *entry) {
+ assert(entry);
- return sys_resume > 0 &&
- sys_resume == location->devno &&
- (sys_offset == location->offset || (sys_offset > 0 && location->offset == UINT64_MAX));
+ free(entry->path);
}
-/*
- * Attempt to find the hibernation location by parsing /proc/swaps, /sys/power/resume, and
- * /sys/power/resume_offset.
- *
- * Beware:
- * Never use a device or file as location that hasn't been somehow specified by a user that would also be
- * entrusted with full system memory access (for example via /sys/power/resume) or that isn't an already
- * active swap area!
- * Otherwise various security attacks might become possible, for example an attacker could silently attach
- * such a device and circumvent full disk encryption when it would be automatically used for hibernation.
- * Also, having a swap area on top of encryption is not per se enough to protect from all such attacks.
- *
- * 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;
+static void swap_entries_done(SwapEntries *entries) {
+ assert(entries);
+
+ FOREACH_ARRAY(i, entries->swaps, entries->n_swaps)
+ swap_entry_done(i);
+
+ free(entries->swaps);
+}
+
+static int swap_entry_get_resume_config(SwapEntry *swap) {
+ _cleanup_close_ int fd = -EBADF;
+ uint64_t offset_raw;
+ struct stat st;
int r;
- /* read the /sys/power/resume & /sys/power/resume_offset values */
- r = read_resume_files(&sys_resume, &sys_offset);
+ assert(swap);
+ assert(swap->path);
+
+ fd = open(swap->path, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
+ if (fd < 0)
+ return -errno;
+
+ if (fstat(fd, &st) < 0)
+ return -errno;
+
+ if (!swap->swapfile) {
+ if (!S_ISBLK(st.st_mode))
+ return -ENOTBLK;
+
+ swap->devno = st.st_rdev;
+ swap->offset = 0;
+ return 0;
+ }
+
+ r = stat_verify_regular(&st);
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 */
+ r = get_block_device_fd(fd, &swap->devno);
+ if (r < 0)
+ return r;
+
+ r = fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to check if swap file '%s' is on Btrfs: %m", swap->path);
+ if (r > 0) {
+ r = btrfs_get_file_physical_offset_fd(fd, &offset_raw);
+ if (r < 0)
+ return r;
+ } else {
+ _cleanup_free_ struct fiemap *fiemap = NULL;
+
+ r = read_fiemap(fd, &fiemap);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to read extent map for swap file '%s': %m", swap->path);
+
+ offset_raw = fiemap->fm_extents[0].fe_physical;
}
+ swap->offset = offset_raw / page_size();
+ return 0;
+}
+
+static int read_swap_entries(SwapEntries *ret) {
+ _cleanup_(swap_entries_done) SwapEntries entries = {};
+ _cleanup_fclose_ FILE *f = NULL;
+
+ assert(ret);
+
+ f = fopen("/proc/swaps", "re");
+ if (!f)
+ return log_debug_errno(errno, "Failed to open /proc/swaps: %m");
+
+ /* Remove header */
(void) fscanf(f, "%*s %*s %*s %*s %*s\n");
+
for (unsigned i = 1;; i++) {
- _cleanup_(swap_entry_freep) SwapEntry *swap = NULL;
+ _cleanup_(swap_entry_done) SwapEntry swap = {};
_cleanup_free_ char *type = NULL;
- uint64_t swap_offset = 0;
int k;
- swap = new(SwapEntry, 1);
- if (!swap)
- return -ENOMEM;
-
- *swap = (SwapEntry) {
- .type = _SWAP_TYPE_INVALID,
- };
-
k = fscanf(f,
"%ms " /* device/file path */
"%ms " /* type of swap */
"%" PRIu64 /* swap size */
"%" PRIu64 /* used */
- "%i\n", /* priority */
- &swap->path, &type, &swap->size, &swap->used, &swap->priority);
+ "%i" /* priority */
+ "\n",
+ &swap.path, &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 (k != 5)
+ return log_debug_errno(SYNTHETIC_ERRNO(EIO), "Failed to parse /proc/swaps line %u.", i);
if (streq(type, "file")) {
-
- if (endswith(swap->path, "\\040(deleted)")) {
- log_debug("Ignoring deleted swap file '%s'.", swap->path);
+ if (endswith(swap.path, "\\040(deleted)")) {
+ log_debug("Swap file '%s' has been deleted, ignoring.", swap.path);
continue;
}
- swap->type = SWAP_FILE;
-
- r = calculate_swap_file_offset(swap, &swap_offset);
- if (r < 0)
- return r;
+ swap.swapfile = true;
} else if (streq(type, "partition")) {
- const char *fn;
+ const char *node;
- fn = path_startswith(swap->path, "/dev/");
- if (fn && startswith(fn, "zram")) {
- log_debug("%s: ignoring zram swap", swap->path);
+ node = path_startswith(swap.path, "/dev/");
+ if (node && startswith(node, "zram")) {
+ log_debug("Swap partition '%s' is a zram device, ignoring.", swap.path);
continue;
}
- swap->type = SWAP_BLOCK;
+ swap.swapfile = false;
} else {
- log_debug("%s: swap type %s is unsupported for hibernation, ignoring", swap->path, type);
+ log_debug("Swap type %s is not supported for hibernation, ignoring device: %s",
+ type, swap.path);
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->path);
- 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->path);
- continue;
- }
- }
+ if (!GREEDY_REALLOC(entries.swaps, entries.n_swaps + 1))
+ return log_oom_debug();
- dev_t swap_devno;
- r = swap_device_to_devnum(swap, &swap_devno);
- if (r < 0)
- return log_debug_errno(r, "%s: failed to query device number: %m", swap->path);
- if (swap_devno == 0)
- return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), "%s: not backed by block device.", swap->path);
+ entries.swaps[entries.n_swaps++] = TAKE_STRUCT(swap);
+ }
- hibernate_location = hibernate_location_free(hibernate_location);
- hibernate_location = new(HibernateLocation, 1);
- if (!hibernate_location)
- return -ENOMEM;
+ *ret = TAKE_STRUCT(entries);
+ return 0;
+}
- *hibernate_location = (HibernateLocation) {
- .devno = swap_devno,
- .offset = swap_offset,
- .swap = TAKE_PTR(swap),
- };
+/* Attempt to find a suitable device for hibernation by parsing /proc/swaps, /sys/power/resume, and
+ * /sys/power/resume_offset.
+ *
+ * Beware:
+ * Never use a device or file that hasn't been somehow specified by a user who would also be entrusted
+ * with full system memory access (for example via /sys/power/resume) or that isn't an already active
+ * swap area! Otherwise various security attacks might become possible, for example an attacker could
+ * silently attach such a device and circumvent full disk encryption when it would be automatically used
+ * for hibernation. Also, having a swap area on top of encryption is not per se enough to protect from all
+ * such attacks.
+ *
+ * Returns:
+ * 1 - Values are set in /sys/power/resume and /sys/power/resume_offset.
+ *
+ * 0 - No values are set in /sys/power/resume and /sys/power/resume_offset.
+ * ret will represent the highest priority swap with most remaining space discovered in /proc/swaps.
+ *
+ * Negative value in the case of error */
+int find_suitable_hibernation_device_full(HibernationDevice *ret_device, uint64_t *ret_size, uint64_t *ret_used) {
+ _cleanup_(swap_entries_done) SwapEntries entries = {};
+ SwapEntry *entry = NULL;
+ uint64_t resume_config_offset;
+ dev_t resume_config_devno;
+ int r;
- /* 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->path);
- resume_match = true;
- break;
- }
+ assert(!ret_size == !ret_used);
- log_debug("%s: is a candidate device.", hibernate_location->swap->path);
- }
+ r = read_resume_config(&resume_config_devno, &resume_config_offset);
+ if (r < 0)
+ return r;
- /* 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.");
+ r = read_swap_entries(&entries);
+ if (r < 0)
+ return r;
+ if (entries.n_swaps == 0)
+ return log_debug_errno(SYNTHETIC_ERRNO(ENOENT), "No swap space available for hibernation.");
+
+ FOREACH_ARRAY(swap, entries.swaps, entries.n_swaps) {
+ r = swap_entry_get_resume_config(swap);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to get devno and offset for swap '%s': %m", swap->path);
+ if (swap->devno == 0) {
+ assert(swap->swapfile);
- /* 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.");
+ log_debug("Swap file '%s' is not backed by block device, ignoring: %m", swap->path);
+ continue;
+ }
+
+ if (resume_config_devno > 0) {
+ if (swap->devno == resume_config_devno &&
+ (!swap->swapfile || resume_config_offset == UINT64_MAX || swap->offset == resume_config_offset)) {
+ /* /sys/power/resume (resume=) is set, and the calculated swap file offset
+ * matches with /sys/power/resume_offset. If /sys/power/resume_offset is not
+ * exposed, we can't do proper check anyway, so use the found swap file too. */
+ entry = swap;
+ break;
+ }
- 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.");
+ /* If resume= is set, don't try to use other swap spaces. */
+ continue;
+ }
- hibernate_location->offset = sys_offset;
+ if (!entry ||
+ swap->priority > entry->priority ||
+ swap->size - swap->used > entry->size - entry->used)
+ entry = swap;
}
- 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->path, 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->path, major(hibernate_location->devno), minor(hibernate_location->devno),
- hibernate_location->offset, hibernate_location->swap->priority);
+ if (!entry) {
+ /* No need to check n_swaps == 0, since it's rejected early */
+ assert(resume_config_devno > 0);
+ return log_debug_errno(SYNTHETIC_ERRNO(ENXIO), "Cannot find swap entry corresponding to /sys/power/resume.");
+ }
- *ret_hibernate_location = TAKE_PTR(hibernate_location);
+ if (ret_device)
+ *ret_device = (HibernationDevice) {
+ .devno = entry->devno,
+ .offset = entry->offset,
+ .path = TAKE_PTR(entry->path),
+ };
- if (resume_match)
- return 1;
+ if (ret_size) {
+ *ret_size = entry->size;
+ *ret_used = entry->used;
+ }
- return 0;
+ return resume_config_devno > 0;
}
bool enough_swap_for_hibernation(void) {
- _cleanup_free_ char *active = NULL;
- _cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL;
- unsigned long long act = 0;
+ _cleanup_free_ char *active_str = NULL;
+ unsigned long long active;
+ uint64_t size, used;
int r;
if (getenv_bool("SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK") > 0)
return true;
- r = find_hibernate_location(&hibernate_location);
+ r = find_suitable_hibernation_device_full(NULL, &size, &used);
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);
+ r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active_str);
if (r < 0) {
log_debug_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m");
return false;
}
- r = safe_atollu(active, &act);
+ r = safe_atollu(active_str, &active);
if (r < 0) {
- log_debug_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m", active);
+ log_debug_errno(r, "Failed to parse Active(anon) '%s' from /proc/meminfo: %m", active_str);
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);
+ r = active <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
+ log_debug("Detected %s swap for hibernation: Active(anon)=%llu kB, size=%" PRIu64 " kB, used=%" PRIu64 " kB, threshold=%.2g%%",
+ r ? "enough" : "not enough", active, 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));
-
- assert(fd >= 0);
- assert(ret);
-
- 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;
-}
-
int write_resume_config(dev_t devno, uint64_t offset, const char *device) {
char offset_str[DECIMAL_STR_MAX(uint64_t)];
_cleanup_free_ char *path = NULL;
projects / thirdparty / systemd.git / commitdiff
