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qbootctl
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A port of the Qualcomm Android bootctrl HAL for musl/glibc userspace.
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qbootctl/bootctrl_impl.cpp

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/*
* Copyright (c) 2016, The Linux Foundation. All rights reserved.
* Copyright (C) 2021-2022 Caleb Connolly <caleb@connolly.tech>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <map>
#include <list>
#include <string>
#include <vector>
#include <errno.h>
#include <regex>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
#include <stdint.h>
#include "utils.h"
#include "gpt-utils.h"
#include "ufs-bsg.h"
#include "bootctrl.h"
#define BOOTDEV_DIR "/dev/disk/by-partlabel"
#define BOOT_IMG_PTN_NAME "boot_"
#define LUN_NAME_END_LOC 14
#define BOOT_SLOT_PROP "slot_suffix"
#define MAX_CMDLINE_SIZE 4096
#define SLOT_ACTIVE 1
#define SLOT_INACTIVE 2
#define UPDATE_SLOT(pentry, guid, slot_state) \
({ \
memcpy(pentry, guid, TYPE_GUID_SIZE); \
if (slot_state == SLOT_ACTIVE) \
*(pentry + AB_FLAG_OFFSET) = AB_SLOT_ACTIVE_VAL; \
else if (slot_state == SLOT_INACTIVE) \
*(pentry + AB_FLAG_OFFSET) = \
(*(pentry + AB_FLAG_OFFSET) & \
~AB_PARTITION_ATTR_SLOT_ACTIVE); \
})
using namespace std;
const char *slot_suffix_arr[] = { AB_SLOT_A_SUFFIX, AB_SLOT_B_SUFFIX, NULL };
enum part_attr_type {
ATTR_SLOT_ACTIVE = 0,
ATTR_BOOT_SUCCESSFUL,
ATTR_UNBOOTABLE,
ATTR_BOOTABLE,
};
struct file {
int fd = -1;
~file()
{
if (fd > -1)
close(fd);
}
int open(const char *path)
{
fd = ::open(path, O_RDONLY);
return fd;
}
};
void get_kernel_cmdline_arg(const char *arg, char *buf, const char *def)
{
file file;
char pcmd[MAX_CMDLINE_SIZE];
char *val, *found, *ptr = buf;
file.open("/proc/cmdline");
int rc = read(file.fd, pcmd, MAX_CMDLINE_SIZE);
if (rc < 0) {
fprintf(stderr, "Couldn't open /proc/cmdline: %d (%s)\n", rc,
strerror(errno));
goto error;
}
found = strstr(pcmd, arg);
if (!found || !(val = strstr(found, "="))) {
fprintf(stderr, "Couldn't find cmdline arg: '%s'\n", arg);
goto error;
}
++val;
// no this doesn't handle quotes lol
while (*val != ' ') {
*ptr++ = *val++;
}
return;
error:
strcpy(buf, def);
}
//Get the value of one of the attribute fields for a partition.
static int get_partition_attribute(char *partname,
enum part_attr_type part_attr)
{
struct gpt_disk disk;
uint8_t *pentry = NULL;
int retval = -1;
uint8_t *attr = NULL;
if (!partname)
return retval;
if (gpt_disk_get_disk_info(partname, &disk)) {
fprintf(stderr, "%s: Failed to get disk info\n", __func__);
return retval;
}
pentry = gpt_disk_get_pentry(&disk, partname, PRIMARY_GPT);
if (!pentry) {
fprintf(stderr, "%s: pentry does not exist in disk struct\n",
__func__);
return retval;
}
attr = pentry + AB_FLAG_OFFSET;
LOGD("get_partition_attribute() partname = %s, attr = 0x%x\n", partname,
*attr);
if (part_attr == ATTR_SLOT_ACTIVE) {
retval = !!(*attr & AB_PARTITION_ATTR_SLOT_ACTIVE);
LOGD("ATTR_SLOT_ACTIVE, retval = %d\n", retval);
} else if (part_attr == ATTR_BOOT_SUCCESSFUL) {
retval = !!(*attr & AB_PARTITION_ATTR_BOOT_SUCCESSFUL);
LOGD("AB_PARTITION_ATTR_BOOT_SUCCESSFUL, retval = %d\n",
retval);
} else if (part_attr == ATTR_UNBOOTABLE) {
retval = !!(*attr & AB_PARTITION_ATTR_UNBOOTABLE);
LOGD("AB_PARTITION_ATTR_UNBOOTABLE, retval = %d\n", retval);
}
return retval;
}
//Set a particular attribute for all the partitions in a
//slot
static int update_slot_attribute(const char *slot, enum part_attr_type ab_attr)
{
unsigned int i = 0;
char buf[PATH_MAX];
struct stat st;
struct gpt_disk disk;
uint8_t *pentry = NULL;
uint8_t *pentry_bak = NULL;
int rc = -1;
uint8_t *attr = NULL;
uint8_t *attr_bak = NULL;
char partName[MAX_GPT_NAME_SIZE + 1] = { 0 };
const char ptn_list[][MAX_GPT_NAME_SIZE - 1] = { AB_PTN_LIST };
int slot_name_valid = 0;
if (!slot) {
fprintf(stderr, "%s: Invalid argument\n", __func__);
return -1;
}
for (i = 0; slot_suffix_arr[i] != NULL; i++) {
if (!strncmp(slot, slot_suffix_arr[i],
strlen(slot_suffix_arr[i])))
slot_name_valid = 1;
}
if (!slot_name_valid) {
fprintf(stderr, "%s: Invalid slot name\n", __func__);
return -1;
}
for (i = 0; i < ARRAY_SIZE(ptn_list); i++) {
memset(buf, '\0', sizeof(buf));
//Check if A/B versions of this ptn exist
snprintf(buf, sizeof(buf) - 1, "%s/%s%s", BOOT_DEV_DIR,
ptn_list[i], AB_SLOT_A_SUFFIX);
if (stat(buf, &st) < 0) {
//partition does not have _a version
continue;
}
memset(buf, '\0', sizeof(buf));
snprintf(buf, sizeof(buf) - 1, "%s/%s%s", BOOT_DEV_DIR,
ptn_list[i], AB_SLOT_B_SUFFIX);
if (stat(buf, &st) < 0) {
//partition does not have _b version
continue;
}
memset(partName, '\0', sizeof(partName));
snprintf(partName, sizeof(partName) - 1, "%s%s", ptn_list[i],
slot);
rc = gpt_disk_get_disk_info(partName, &disk);
if (rc != 0) {
fprintf(stderr, "%s: Failed to get disk info for %s\n",
__func__, partName);
return -1;
}
pentry = gpt_disk_get_pentry(&disk, partName, PRIMARY_GPT);
pentry_bak =
gpt_disk_get_pentry(&disk, partName, SECONDARY_GPT);
if (!pentry || !pentry_bak) {
fprintf(stderr,
"%s: Failed to get pentry/pentry_bak for %s\n",
__func__, partName);
return -1;
}
attr = pentry + AB_FLAG_OFFSET;
LOGD("%s: got pentry for part '%s': 0x%lx (at flags: 0x%x)\n",
__func__, partName, *(uint64_t *)pentry, *attr);
attr_bak = pentry_bak + AB_FLAG_OFFSET;
switch (ab_attr) {
case ATTR_BOOT_SUCCESSFUL:
*attr = (*attr) | AB_PARTITION_ATTR_BOOT_SUCCESSFUL;
*attr_bak =
(*attr_bak) | AB_PARTITION_ATTR_BOOT_SUCCESSFUL;
break;
case ATTR_UNBOOTABLE:
*attr = (*attr) | AB_PARTITION_ATTR_UNBOOTABLE;
*attr_bak = (*attr_bak) | AB_PARTITION_ATTR_UNBOOTABLE;
break;
case ATTR_BOOTABLE:
*attr = (*attr) ^ AB_PARTITION_ATTR_UNBOOTABLE;
*attr_bak = (*attr_bak) ^ AB_PARTITION_ATTR_UNBOOTABLE;
break;
case ATTR_SLOT_ACTIVE:
*attr = (*attr) | AB_PARTITION_ATTR_SLOT_ACTIVE;
*attr_bak = (*attr) | AB_PARTITION_ATTR_SLOT_ACTIVE;
break;
default:
fprintf(stderr, "%s: Unrecognized attr\n", __func__);
return -1;
}
if (gpt_disk_update_crc(&disk)) {
fprintf(stderr, "%s: Failed to update crc for %s\n",
__func__, partName);
return -1;
}
if (gpt_disk_commit(&disk)) {
fprintf(stderr,
"%s: Failed to write back entry for %s\n",
__func__, partName);
return -1;
}
}
return 0;
}
struct dir {
DIR *dir = NULL;
~dir()
{
if (dir)
closedir(dir);
}
DIR *open(const char *name)
{
dir = opendir(name);
return dir;
}
};
unsigned get_number_slots()
{
struct dirent *de = NULL;
dir dir_bootdev;
unsigned slot_count = 0;
if (!dir_bootdev.open(BOOTDEV_DIR)) {
fprintf(stderr, "%s: Failed to open bootdev dir (%s)\n",
__func__, strerror(errno));
return 0;
}
while ((de = readdir(dir_bootdev.dir))) {
if (de->d_name[0] == '.')
continue;
static_assert(AB_SLOT_A_SUFFIX[0] == '_',
"Breaking change to slot A suffix");
static_assert(AB_SLOT_B_SUFFIX[0] == '_',
"Breaking change to slot B suffix");
if (!strncmp(de->d_name, BOOT_IMG_PTN_NAME,
strlen(BOOT_IMG_PTN_NAME)) &&
!!strncmp(de->d_name, "boot_aging\n",
strlen("boot_aging"))) {
slot_count++;
}
}
return slot_count;
}
static unsigned int get_current_slot()
{
uint32_t num_slots = 0;
char bootSlotProp[MAX_CMDLINE_SIZE] = { '\0' };
unsigned i = 0;
num_slots = get_number_slots();
if (num_slots <= 1) {
//Slot 0 is the only slot around.
return 0;
}
get_kernel_cmdline_arg(BOOT_SLOT_PROP, bootSlotProp, "_a");
if (!strncmp(bootSlotProp, "N/A\n", strlen("N/A"))) {
fprintf(stderr, "%s: Unable to read boot slot property\n",
__func__);
return 0;
}
//Iterate through a list of partitons named as boot+suffix
//and see which one is currently active.
for (i = 0; slot_suffix_arr[i] != NULL; i++) {
if (!strncmp(bootSlotProp, slot_suffix_arr[i],
strlen(slot_suffix_arr[i]))) {
//printf("%s current_slot = %d\n", __func__, i);
return i;
}
}
//The HAL spec requires that we return a number between
//0 to num_slots - 1. Since something went wrong here we
//are just going to return the default slot.
return 0;
}
static int boot_control_check_slot_sanity(unsigned slot)
{
uint32_t num_slots = get_number_slots();
if ((num_slots < 1) || (slot > num_slots - 1)) {
fprintf(stderr, "Invalid slot number");
return -1;
}
return 0;
}
int get_boot_attr(unsigned slot, enum part_attr_type attr)
{
char bootPartition[MAX_GPT_NAME_SIZE + 1] = { 0 };
if (boot_control_check_slot_sanity(slot) != 0) {
fprintf(stderr, "%s: Argument check failed\n", __func__);
return -1;
}
snprintf(bootPartition, sizeof(bootPartition) - 1, "boot%s",
slot_suffix_arr[slot]);
return get_partition_attribute(bootPartition, attr);
}
int is_slot_bootable(unsigned slot)
{
int attr = 0;
attr = get_boot_attr(slot, ATTR_UNBOOTABLE);
if (attr >= 0)
return !attr;
return -1;
}
int mark_boot_successful(unsigned slot)
{
int successful = get_boot_attr(slot, ATTR_BOOT_SUCCESSFUL);
if (!is_slot_bootable(slot)) {
printf("SLOT %s: was marked unbootable, fixing this"
" (I hope you know what you're doing...)\n",
slot_suffix_arr[slot]);
update_slot_attribute(slot_suffix_arr[slot], ATTR_BOOTABLE);
}
if (successful) {
fprintf(stderr, "SLOT %s: already marked successful\n",
slot_suffix_arr[slot]);
return 0;
}
if (update_slot_attribute(slot_suffix_arr[slot],
ATTR_BOOT_SUCCESSFUL)) {
fprintf(stderr, "SLOT %s: Failed to mark boot successful\n",
slot_suffix_arr[slot]);
return -1;
}
return 0;
}
const char *get_suffix(unsigned slot)
{
if (boot_control_check_slot_sanity(slot) != 0)
return "";
else
return slot_suffix_arr[slot];
}
//Return a gpt disk structure representing the disk that holds
//partition.
static bool boot_ctl_get_disk_info(char *partition, gpt_disk *disk)
{
if (!partition)
return false;
if (gpt_disk_get_disk_info(partition, disk)) {
fprintf(stderr, "failed to get disk info for %s\n", partition);
return false;
}
return true;
}
//The argument here is a vector of partition names(including the slot suffix)
//that lie on a single disk
static int boot_ctl_set_active_slot_for_partitions(vector<string> part_list,
unsigned slot)
{
char buf[PATH_MAX] = { 0 };
struct gpt_disk disk;
char slotA[MAX_GPT_NAME_SIZE + 1] = { 0 };
char slotB[MAX_GPT_NAME_SIZE + 1] = { 0 };
char active_guid[TYPE_GUID_SIZE + 1] = { 0 };
char inactive_guid[TYPE_GUID_SIZE + 1] = { 0 };
int rc;
//Pointer to the partition entry of current 'A' partition
uint8_t *pentryA = NULL;
uint8_t *pentryA_bak = NULL;
//Pointer to partition entry of current 'B' partition
uint8_t *pentryB = NULL;
uint8_t *pentryB_bak = NULL;
struct stat st;
vector<string>::iterator partition_iterator;
LOGD("Marking slot %s as active:\n", slot_suffix_arr[slot]);
for (partition_iterator = part_list.begin();
partition_iterator != part_list.end(); partition_iterator++) {
//Chop off the slot suffix from the partition name to
//make the string easier to work with.
string prefix = *partition_iterator;
LOGD("Part: %s\n", prefix.c_str());
if (prefix.size() < (strlen(AB_SLOT_A_SUFFIX) + 1)) {
fprintf(stderr, "Invalid partition name: %s\n",
prefix.c_str());
return -1;
}
prefix.resize(prefix.size() - strlen(AB_SLOT_A_SUFFIX));
//Check if A/B versions of this ptn exist
snprintf(buf, sizeof(buf) - 1, "%s/%s%s", BOOT_DEV_DIR,
prefix.c_str(), AB_SLOT_A_SUFFIX);
LOGD("\t_a Path: '%s'\n", buf);
rc = stat(buf, &st);
if (rc < 0) {
fprintf(stderr, "Failed to stat() path: %d: %s\n", rc,
strerror(errno));
continue;
}
memset(buf, '\0', sizeof(buf));
snprintf(buf, sizeof(buf) - 1, "%s/%s%s", BOOT_DEV_DIR,
prefix.c_str(), AB_SLOT_B_SUFFIX);
LOGD("\t_b Path: '%s'\n", buf);
rc = stat(buf, &st);
if (rc < 0) {
fprintf(stderr, "Failed to stat() path: %d: %s\n", rc,
strerror(errno));
continue;
}
memset(slotA, 0, sizeof(slotA));
memset(slotB, 0, sizeof(slotA));
snprintf(slotA, sizeof(slotA) - 1, "%s%s", prefix.c_str(),
AB_SLOT_A_SUFFIX);
snprintf(slotB, sizeof(slotB) - 1, "%s%s", prefix.c_str(),
AB_SLOT_B_SUFFIX);
//Get the disk containing the partitions that were passed in.
//All partitions passed in must lie on the same disk.
if (!boot_ctl_get_disk_info(slotA, &disk))
return -1;
//Get partition entry for slot A & B from the primary
//and backup tables.
pentryA = gpt_disk_get_pentry(&disk, slotA, PRIMARY_GPT);
pentryA_bak = gpt_disk_get_pentry(&disk, slotA, SECONDARY_GPT);
pentryB = gpt_disk_get_pentry(&disk, slotB, PRIMARY_GPT);
pentryB_bak = gpt_disk_get_pentry(&disk, slotB, SECONDARY_GPT);
if (!pentryA || !pentryA_bak || !pentryB || !pentryB_bak) {
//None of these should be NULL since we have already
//checked for A & B versions earlier.
fprintf(stderr, "Slot pentries for %s not found.\n",
prefix.c_str());
return -1;
}
LOGD("\tAB attr (A): 0x%x (backup: 0x%x)\n",
*(uint16_t *)(pentryA + AB_FLAG_OFFSET),
*(uint16_t *)(pentryA_bak + AB_FLAG_OFFSET));
LOGD("\tAB attr (B): 0x%x (backup: 0x%x)\n",
*(uint16_t *)(pentryB + AB_FLAG_OFFSET),
*(uint16_t *)(pentryB_bak + AB_FLAG_OFFSET));
memset(active_guid, '\0', sizeof(active_guid));
memset(inactive_guid, '\0', sizeof(inactive_guid));
if (get_partition_attribute(slotA, ATTR_SLOT_ACTIVE) == 1) {
//A is the current active slot
memcpy((void *)active_guid, (const void *)pentryA,
TYPE_GUID_SIZE);
memcpy((void *)inactive_guid, (const void *)pentryB,
TYPE_GUID_SIZE);
} else if (get_partition_attribute(slotB, ATTR_SLOT_ACTIVE) ==
1) {
//B is the current active slot
memcpy((void *)active_guid, (const void *)pentryB,
TYPE_GUID_SIZE);
memcpy((void *)inactive_guid, (const void *)pentryA,
TYPE_GUID_SIZE);
} else {
fprintf(stderr, "Both A & B are inactive..Aborting");
return -1;
}
// printf("\tActive GUID: %s\n", active_guid);
// printf("\tInactive GUID: %s\n", active_guid);
if (!strncmp(slot_suffix_arr[slot], AB_SLOT_A_SUFFIX,
strlen(AB_SLOT_A_SUFFIX))) {
//Mark A as active in primary table
UPDATE_SLOT(pentryA, active_guid, SLOT_ACTIVE);
//Mark A as active in backup table
UPDATE_SLOT(pentryA_bak, active_guid, SLOT_ACTIVE);
//Mark B as inactive in primary table
UPDATE_SLOT(pentryB, inactive_guid, SLOT_INACTIVE);
//Mark B as inactive in backup table
UPDATE_SLOT(pentryB_bak, inactive_guid, SLOT_INACTIVE);
} else if (!strncmp(slot_suffix_arr[slot], AB_SLOT_B_SUFFIX,
strlen(AB_SLOT_B_SUFFIX))) {
//Mark B as active in primary table
UPDATE_SLOT(pentryB, active_guid, SLOT_ACTIVE);
//Mark B as active in backup table
UPDATE_SLOT(pentryB_bak, active_guid, SLOT_ACTIVE);
//Mark A as inavtive in primary table
UPDATE_SLOT(pentryA, inactive_guid, SLOT_INACTIVE);
//Mark A as inactive in backup table
UPDATE_SLOT(pentryA_bak, inactive_guid, SLOT_INACTIVE);
} else {
//Something has gone terribly terribly wrong
fprintf(stderr, "%s: Unknown slot suffix!\n", __func__);
return -1;
}
if (gpt_disk_update_crc(&disk) != 0) {
fprintf(stderr, "%s: Failed to update gpt_disk crc\n",
__func__);
return -1;
}
}
//write updated content to disk
if (gpt_disk_commit(&disk)) {
fprintf(stderr, "Failed to commit disk entry");
return -1;
}
return 0;
}
unsigned get_active_boot_slot()
{
uint32_t num_slots = get_number_slots();
if (num_slots <= 1) {
//Slot 0 is the only slot around.
return 0;
}
for (uint32_t i = 0; i < num_slots; i++) {
if (get_boot_attr(i, ATTR_SLOT_ACTIVE))
return i;
}
fprintf(stderr, "%s: Failed to find the active boot slot\n", __func__);
return 0;
}
int set_active_boot_slot(unsigned slot)
{
map<string, vector<string> > ptn_map;
vector<string> ptn_vec;
const char ptn_list[][MAX_GPT_NAME_SIZE] = { AB_PTN_LIST };
uint32_t i;
int rc = -1;
map<string, vector<string> >::iterator map_iter;
bool ismmc;
if (boot_control_check_slot_sanity(slot)) {
fprintf(stderr, "%s: Bad arguments\n", __func__);
return -1;
}
ismmc = gpt_utils_is_partition_backed_by_emmc(PTN_XBL AB_SLOT_A_SUFFIX);
if (!ismmc && ufs_bsg_dev_open() < 0) {
return -1;
}
//The partition list just contains prefixes(without the _a/_b) of the
//partitions that support A/B. In order to get the layout we need the
//actual names. To do this we append the slot suffix to every member
//in the list.
for (i = 0; i < ARRAY_SIZE(ptn_list); i++) {
//XBL is handled differrently for ufs devices so ignore it
if (!ismmc && !strncmp(ptn_list[i], PTN_XBL, strlen(PTN_XBL)))
continue;
//The partition list will be the list of _a partitions
string cur_ptn = ptn_list[i];
cur_ptn.append(AB_SLOT_A_SUFFIX);
ptn_vec.push_back(cur_ptn);
}
//The partition map gives us info in the following format:
// [path_to_block_device_1]--><partitions on device 1>
// [path_to_block_device_2]--><partitions on device 2>
// ...
// ...
// eg:
// [/dev/block/sdb]---><system, boot, rpm, tz,....>
if (gpt_utils_get_partition_map(ptn_vec, ptn_map)) {
fprintf(stderr, "%s: Failed to get partition map\n", __func__);
return -1;
}
for (map_iter = ptn_map.begin(); map_iter != ptn_map.end();
map_iter++) {
if (map_iter->second.size() < 1)
continue;
if (boot_ctl_set_active_slot_for_partitions(map_iter->second,
slot)) {
fprintf(stderr,
"%s: Failed to set active slot for partitions \n",
__func__);
return -1;
}
}
// EMMC doesn't need attributes to be set.
if (ismmc)
return 0;
if (!strncmp(slot_suffix_arr[slot], AB_SLOT_A_SUFFIX,
strlen(AB_SLOT_A_SUFFIX))) {
//Set xbl_a as the boot lun
rc = gpt_utils_set_xbl_boot_partition(NORMAL_BOOT);
} else if (!strncmp(slot_suffix_arr[slot], AB_SLOT_B_SUFFIX,
strlen(AB_SLOT_B_SUFFIX))) {
//Set xbl_b as the boot lun
rc = gpt_utils_set_xbl_boot_partition(BACKUP_BOOT);
} else {
//Something has gone terribly terribly wrong
fprintf(stderr, "%s: Unknown slot suffix!\n", __func__);
return -1;
}
if (rc) {
fprintf(stderr,
"%s: Failed to switch xbl boot partition\n",
__func__);
return -1;
}
return 0;
}
int set_slot_as_unbootable(unsigned slot)
{
if (boot_control_check_slot_sanity(slot) != 0) {
fprintf(stderr, "%s: Argument check failed\n", __func__);
goto error;
}
if (update_slot_attribute(slot_suffix_arr[slot], ATTR_UNBOOTABLE)) {
goto error;
}
return 0;
error:
fprintf(stderr, "%s: Failed to mark slot unbootable\n", __func__);
return -1;
}
int is_slot_marked_successful(unsigned slot)
{
int attr = 0;
char bootPartition[MAX_GPT_NAME_SIZE + 1] = { 0 };
if (boot_control_check_slot_sanity(slot) != 0) {
fprintf(stderr, "%s: Argument check failed\n", __func__);
return -1;
}
snprintf(bootPartition, sizeof(bootPartition) - 1, "boot%s",
slot_suffix_arr[slot]);
attr = get_partition_attribute(bootPartition, ATTR_BOOT_SUCCESSFUL);
LOGD("%s: slot = %d, attr = 0x%x\n", __func__, slot, attr);
if (attr >= 0)
return attr;
return -1;
}
const struct boot_control_module bootctl = {
.getCurrentSlot = get_current_slot,
.markBootSuccessful = mark_boot_successful,
.setActiveBootSlot = set_active_boot_slot,
.setSlotAsUnbootable = set_slot_as_unbootable,
.isSlotBootable = is_slot_bootable,
.getSuffix = get_suffix,
.isSlotMarkedSuccessful = is_slot_marked_successful,
.getActiveBootSlot = get_active_boot_slot,
};