diff options
Diffstat (limited to 'src/sleep')
| -rw-r--r-- | src/sleep/sleep.c | 74 |
1 files changed, 71 insertions, 3 deletions
diff --git a/src/sleep/sleep.c b/src/sleep/sleep.c index 2830b23553..1163a0f56a 100644 --- a/src/sleep/sleep.c +++ b/src/sleep/sleep.c @@ -4,6 +4,7 @@ Copyright 2012 Lennart Poettering Copyright 2013 Zbigniew Jędrzejewski-Szmek + Copyright 2010-2017 Canonical Copyright 2018 Dell Inc. systemd is free software; you can redistribute it and/or modify it @@ -22,6 +23,7 @@ #include <errno.h> #include <getopt.h> +#include <linux/fiemap.h> #include <stdio.h> #include "sd-messages.h" @@ -40,6 +42,67 @@ static char* arg_verb = NULL; +static int write_hibernate_location_info(void) { + _cleanup_free_ char *device = NULL, *type = NULL; + _cleanup_free_ struct fiemap *fiemap = NULL; + 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); + if (r < 0) + return log_debug_errno(r, "Unable to find hibernation location: %m"); + + /* if it's a swap partition, we just write the disk to /sys/power/resume */ + if (streq(type, "partition")) + return write_string_file("/sys/power/resume", device, 0); + else if (!streq(type, "file")) + return log_debug_errno(EINVAL, "Invalid hibernate type %s: %m", + type); + + /* Only available in 4.17+ */ + if (access("/sys/power/resume_offset", F_OK) < 0) { + if (errno == ENOENT) + return 0; + return log_debug_errno(errno, "/sys/power/resume_offset unavailable: %m"); + } + + r = access("/sys/power/resume_offset", W_OK); + if (r < 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 = 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) { + log_debug("No extents found in '%s'", device); + return -EINVAL; + } + offset = fiemap->fm_extents[0].fe_physical / page_size(); + xsprintf(offset_str, "%" PRIu64, offset); + r = write_string_file("/sys/power/resume_offset", offset_str, 0); + if (r < 0) + return log_debug_errno(r, "Failed to write offset '%s': %m", + offset_str); + + xsprintf(device_str, "%lx", (unsigned long)stb.st_dev); + r = write_string_file("/sys/power/resume", device_str, 0); + if (r < 0) + return log_debug_errno(r, "Failed to write device '%s': %m", + device_str); + return 0; +} + static int write_mode(char **modes) { int r = 0; char **mode; @@ -110,9 +173,14 @@ static int execute(char **modes, char **states) { return log_error_errno(errno, "Failed to open /sys/power/state: %m"); /* Configure the hibernation mode */ - r = write_mode(modes); - if (r < 0) - return r; + if (!strv_isempty(modes)) { + r = write_hibernate_location_info(); + if (r < 0) + return log_error_errno(r, "Failed to write hibernation disk offset: %m"); + r = write_mode(modes); + if (r < 0) + return r; + } execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments); |