qbootctl/bootctrl_impl.cpp

/*
 * 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 "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,
};

void get_kernel_cmdline_arg(const char *arg, char *buf, const char *def)
{
	int fd;
	char pcmd[MAX_CMDLINE_SIZE];
	char *val, *found, *ptr = buf;
	fd = open("/proc/cmdline", O_RDONLY);
	int rc = read(fd, pcmd, MAX_CMDLINE_SIZE);
	if (rc < 0) {
		fprintf(stderr, "Couldn't open /proc/cmdline: %d (%s)\n", rc,
			strerror(errno));
		goto error;
	}
	close(fd);
	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 = NULL;
	uint8_t *pentry = NULL;
	int retval = -1;
	uint8_t *attr = NULL;
	if (!partname)
		goto error;
	disk = gpt_disk_alloc();
	if (!disk) {
		fprintf(stderr, "%s: Failed to alloc disk struct\n", __func__);
		goto error;
	}
	if (gpt_disk_get_disk_info(partname, disk)) {
		fprintf(stderr, "%s: Failed to get disk info\n", __func__);
		goto error;
	}
	pentry = gpt_disk_get_pentry(disk, partname, PRIMARY_GPT);

	if (!pentry) {
		fprintf(stderr, "%s: pentry does not exist in disk struct\n",
			__func__);
		goto error;
	}
	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);
	} else {
		retval = -1;
	}
	gpt_disk_free(disk);
	return retval;
error:
	if (disk)
		gpt_disk_free(disk);
	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 = NULL;
	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__);
		goto error;
	}
	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__);
		goto error;
	}
	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);
		disk = gpt_disk_alloc();
		if (!disk) {
			fprintf(stderr, "%s: Failed to alloc disk struct\n",
				__func__);
			goto error;
		}
		rc = gpt_disk_get_disk_info(partName, disk);
		if (rc != 0) {
			fprintf(stderr, "%s: Failed to get disk info for %s\n",
				__func__, partName);
			goto error;
		}
		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);
			goto error;
		}
		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__);
			goto error;
		}
		if (gpt_disk_update_crc(disk)) {
			fprintf(stderr, "%s: Failed to update crc for %s\n",
				__func__, partName);
			goto error;
		}
		if (gpt_disk_commit(disk)) {
			fprintf(stderr,
				"%s: Failed to write back entry for %s\n",
				__func__, partName);
			goto error;
		}
		gpt_disk_free(disk);
		disk = NULL;
	}
	return 0;
error:
	if (disk)
		gpt_disk_free(disk);
	return -1;
}

unsigned get_number_slots()
{
	struct dirent *de = NULL;
	DIR *dir_bootdev = NULL;
	unsigned slot_count = 0;

	dir_bootdev = opendir(BOOTDEV_DIR);
	if (!dir_bootdev) {
		fprintf(stderr, "%s: Failed to open bootdev dir (%s)\n",
			__func__, strerror(errno));
		goto error;
	}
	while ((de = readdir(dir_bootdev))) {
		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++;
		}
	}
	closedir(dir_bootdev);
	return slot_count;
error:
	if (dir_bootdev)
		closedir(dir_bootdev);
	return 0;
}

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__);
		goto error;
	}
	//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;
		}
	}
error:
	//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)) {
		goto error;
	}
	return 0;
error:
	fprintf(stderr, "SLOT %s: Failed to mark boot successful\n",
		slot_suffix_arr[slot]);
	return -1;
}

const char *get_suffix(unsigned slot)
{
	if (boot_control_check_slot_sanity(slot) != 0)
		return NULL;
	else
		return slot_suffix_arr[slot];
}

//Return a gpt disk structure representing the disk that holds
//partition.
static struct gpt_disk *boot_ctl_get_disk_info(char *partition)
{
	struct gpt_disk *disk = NULL;
	if (!partition)
		return NULL;
	disk = gpt_disk_alloc();
	if (!disk) {
		fprintf(stderr, "%s: Failed to alloc disk\n", __func__);
		goto error;
	}
	if (gpt_disk_get_disk_info(partition, disk)) {
		fprintf(stderr, "failed to get disk info for %s\n", partition);
		goto error;
	}
	return disk;
error:
	if (disk)
		gpt_disk_free(disk);
	return NULL;
}

//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 = NULL;
	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());
			goto error;
		}
		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 (!disk) {
			disk = boot_ctl_get_disk_info(slotA);
			if (!disk)
				goto error;
		}
		//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());
			goto error;
		}
		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");
			goto error;
		}
		// 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__);
			goto error;
		}
		if (gpt_disk_update_crc(disk) != 0) {
			fprintf(stderr, "%s: Failed to update gpt_disk crc\n",
				__func__);
			goto error;
		}
	}
	//write updated content to disk
	if (disk) {
		if (gpt_disk_commit(disk)) {
			fprintf(stderr, "Failed to commit disk entry");
			goto error;
		}
		gpt_disk_free(disk);
	}
	return 0;

error:
	if (disk)
		gpt_disk_free(disk);
	return -1;
}

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__);
		goto error;
	}

	ismmc = gpt_utils_is_partition_backed_by_emmc(PTN_XBL AB_SLOT_A_SUFFIX);

	if (!ismmc && ufs_bsg_dev_open() < 0) {
		goto error;
	}

	//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__);
		goto error;
	}
	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__);
			;
			goto error;
		}
	}

	// 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__);
		goto error;
	}
	if (rc) {
		fprintf(stderr,
			"%s: Failed to switch xbl boot partition\n",
			__func__);
		goto error;
	}

	return 0;

error:
	return -1;
}

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__);
		goto error;
	}
	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;
error:
	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,
};