You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1557 lines
57 KiB
1557 lines
57 KiB
/*
|
|
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
* * Neither the name of The Linux Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
|
|
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
|
|
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#define _LARGEFILE64_SOURCE /* enable lseek64() */
|
|
|
|
/******************************************************************************
|
|
* INCLUDE SECTION
|
|
******************************************************************************/
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <scsi/ufs/ioctl.h>
|
|
#include <scsi/ufs/ufs.h>
|
|
#include <unistd.h>
|
|
#include <linux/fs.h>
|
|
#include <limits.h>
|
|
#include <dirent.h>
|
|
#include <inttypes.h>
|
|
#include <linux/kernel.h>
|
|
#include <asm/byteorder.h>
|
|
#include <map>
|
|
#include <vector>
|
|
#include <string>
|
|
#include <endian.h>
|
|
#include <zlib.h>
|
|
|
|
#include "gpt-utils.h"
|
|
|
|
|
|
/******************************************************************************
|
|
* DEFINE SECTION
|
|
******************************************************************************/
|
|
#define BLK_DEV_FILE "/dev/disk/mmcblk0"
|
|
/* list the names of the backed-up partitions to be swapped */
|
|
/* extension used for the backup partitions - tzbak, abootbak, etc. */
|
|
#define BAK_PTN_NAME_EXT "bak"
|
|
#define XBL_PRIMARY "/dev/disk/by-partlabel/xbl_a" // FIXME
|
|
#define XBL_BACKUP "/dev/disk/by-partlabel/xblbak"
|
|
#define XBL_AB_PRIMARY "/dev/disk/by-partlabel/xbl_a"
|
|
#define XBL_AB_SECONDARY "/dev/disk/by-partlabel/xbl_b"
|
|
/* GPT defines */
|
|
#define MAX_LUNS 26
|
|
//Size of the buffer that needs to be passed to the UFS ioctl
|
|
#define UFS_ATTR_DATA_SIZE 32
|
|
//This will allow us to get the root lun path from the path to the partition.
|
|
//i.e: from /dev/disk/sdaXXX get /dev/disk/sda. The assumption here is that
|
|
//the boot critical luns lie between sda to sdz which is acceptable because
|
|
//only user added external disks,etc would lie beyond that limit which do not
|
|
//contain partitions that interest us here.
|
|
#define PATH_TRUNCATE_LOC (sizeof("/dev/disk/sda") - 1)
|
|
|
|
//From /dev/disk/sda get just sda
|
|
#define LUN_NAME_START_LOC (sizeof("/dev/disk/") - 1)
|
|
#define BOOT_LUN_A_ID 1
|
|
#define BOOT_LUN_B_ID 2
|
|
/******************************************************************************
|
|
* MACROS
|
|
******************************************************************************/
|
|
|
|
|
|
#define GET_4_BYTES(ptr) ((uint32_t) *((uint8_t *)(ptr)) | \
|
|
((uint32_t) *((uint8_t *)(ptr) + 1) << 8) | \
|
|
((uint32_t) *((uint8_t *)(ptr) + 2) << 16) | \
|
|
((uint32_t) *((uint8_t *)(ptr) + 3) << 24))
|
|
|
|
#define GET_8_BYTES(ptr) ((uint64_t) *((uint8_t *)(ptr)) | \
|
|
((uint64_t) *((uint8_t *)(ptr) + 1) << 8) | \
|
|
((uint64_t) *((uint8_t *)(ptr) + 2) << 16) | \
|
|
((uint64_t) *((uint8_t *)(ptr) + 3) << 24) | \
|
|
((uint64_t) *((uint8_t *)(ptr) + 4) << 32) | \
|
|
((uint64_t) *((uint8_t *)(ptr) + 5) << 40) | \
|
|
((uint64_t) *((uint8_t *)(ptr) + 6) << 48) | \
|
|
((uint64_t) *((uint8_t *)(ptr) + 7) << 56))
|
|
|
|
#define PUT_4_BYTES(ptr, y) *((uint8_t *)(ptr)) = (y) & 0xff; \
|
|
*((uint8_t *)(ptr) + 1) = ((y) >> 8) & 0xff; \
|
|
*((uint8_t *)(ptr) + 2) = ((y) >> 16) & 0xff; \
|
|
*((uint8_t *)(ptr) + 3) = ((y) >> 24) & 0xff;
|
|
|
|
/******************************************************************************
|
|
* TYPES
|
|
******************************************************************************/
|
|
using namespace std;
|
|
enum gpt_state {
|
|
GPT_OK = 0,
|
|
GPT_BAD_SIGNATURE,
|
|
GPT_BAD_CRC
|
|
};
|
|
//List of LUN's containing boot critical images.
|
|
//Required in the case of UFS devices
|
|
struct update_data {
|
|
char lun_list[MAX_LUNS][PATH_MAX];
|
|
uint32_t num_valid_entries;
|
|
};
|
|
|
|
/******************************************************************************
|
|
* FUNCTIONS
|
|
******************************************************************************/
|
|
/**
|
|
* ==========================================================================
|
|
*
|
|
* \brief Read/Write len bytes from/to block dev
|
|
*
|
|
* \param [in] fd block dev file descriptor (returned from open)
|
|
* \param [in] rw RW flag: 0 - read, != 0; - write
|
|
* \param [in] offset block dev offset [bytes] - RW start position
|
|
* \param [in] buf Pointer to the buffer containing the data
|
|
* \param [in] len RW size in bytes. Buf must be at least that big
|
|
*
|
|
* \return 0 on success
|
|
*
|
|
* ==========================================================================
|
|
*/
|
|
static int blk_rw(int fd, int rw, uint64_t offset, uint8_t *buf, unsigned len)
|
|
{
|
|
int r;
|
|
|
|
if (lseek64(fd, offset, SEEK_SET) < 0) {
|
|
fprintf(stderr, "block dev lseek64 %" PRIu64 " failed: %s\n", offset,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
if (rw)
|
|
r = write(fd, buf, len);
|
|
else
|
|
r = read(fd, buf, len);
|
|
|
|
if (r < 0) {
|
|
fprintf(stderr, "block dev %s failed: %s\n", rw ? "write" : "read\n",
|
|
strerror(errno));
|
|
} else {
|
|
if (rw) {
|
|
r = fsync(fd);
|
|
if (r < 0)
|
|
fprintf(stderr, "fsync failed: %s\n", strerror(errno));
|
|
} else {
|
|
r = 0;
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* ==========================================================================
|
|
*
|
|
* \brief Search within GPT for partition entry with the given name
|
|
* or it's backup twin (name-bak).
|
|
*
|
|
* \param [in] ptn_name Partition name to seek
|
|
* \param [in] pentries_start Partition entries array start pointer
|
|
* \param [in] pentries_end Partition entries array end pointer
|
|
* \param [in] pentry_size Single partition entry size [bytes]
|
|
*
|
|
* \return First partition entry pointer that matches the name or NULL
|
|
*
|
|
* ==========================================================================
|
|
*/
|
|
static uint8_t *gpt_pentry_seek(const char *ptn_name,
|
|
const uint8_t *pentries_start,
|
|
const uint8_t *pentries_end,
|
|
uint32_t pentry_size)
|
|
{
|
|
char *pentry_name;
|
|
unsigned len = strlen(ptn_name);
|
|
|
|
for (pentry_name = (char *) (pentries_start + PARTITION_NAME_OFFSET);
|
|
pentry_name < (char *) pentries_end; pentry_name += pentry_size) {
|
|
char name8[MAX_GPT_NAME_SIZE / 2];
|
|
unsigned i;
|
|
|
|
/* Partition names in GPT are UTF-16 - ignoring UTF-16 2nd byte */
|
|
for (i = 0; i < sizeof(name8); i++)
|
|
name8[i] = pentry_name[i * 2];
|
|
if (!strncmp(ptn_name, name8, len))
|
|
if (name8[len] == 0; || !strcmp(&name8[len], BAK_PTN_NAME_EXT))
|
|
return (uint8_t *) (pentry_name - PARTITION_NAME_OFFSET);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* ==========================================================================
|
|
*
|
|
* \brief Swaps boot chain in GPT partition entries array
|
|
*
|
|
* \param [in] pentries_start Partition entries array start
|
|
* \param [in] pentries_end Partition entries array end
|
|
* \param [in] pentry_size Single partition entry size
|
|
*
|
|
* \return 0 on success, 1 if no backup partitions found
|
|
*
|
|
* ==========================================================================
|
|
*/
|
|
static int gpt_boot_chain_swap(const uint8_t *pentries_start,
|
|
const uint8_t *pentries_end,
|
|
uint32_t pentry_size)
|
|
{
|
|
const char ptn_swap_list[][MAX_GPT_NAME_SIZE] = { PTN_SWAP_LIST };
|
|
|
|
int backup_not_found = 1;
|
|
unsigned i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ptn_swap_list); i++) {
|
|
uint8_t *ptn_entry;
|
|
uint8_t *ptn_bak_entry;
|
|
uint8_t ptn_swap[PTN_ENTRY_SIZE];
|
|
//Skip the xbl partition on UFS devices. That is handled
|
|
//seperately.
|
|
if (gpt_utils_is_ufs_device() && !strncmp(ptn_swap_list[i],
|
|
PTN_XBL,
|
|
strlen(PTN_XBL)))
|
|
continue;
|
|
|
|
ptn_entry = gpt_pentry_seek(ptn_swap_list[i], pentries_start,
|
|
pentries_end, pentry_size);
|
|
if (ptn_entry == NULL)
|
|
continue;
|
|
|
|
ptn_bak_entry = gpt_pentry_seek(ptn_swap_list[i],
|
|
ptn_entry + pentry_size, pentries_end, pentry_size);
|
|
if (ptn_bak_entry == NULL) {
|
|
fprintf(stderr, "'%s' partition not backup - skip safe update\n",
|
|
ptn_swap_list[i]);
|
|
continue;
|
|
}
|
|
|
|
/* swap primary <-> backup partition entries */
|
|
memcpy(ptn_swap, ptn_entry, PTN_ENTRY_SIZE);
|
|
memcpy(ptn_entry, ptn_bak_entry, PTN_ENTRY_SIZE);
|
|
memcpy(ptn_bak_entry, ptn_swap, PTN_ENTRY_SIZE);
|
|
backup_not_found = 0;
|
|
}
|
|
|
|
return backup_not_found;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* ==========================================================================
|
|
*
|
|
* \brief Sets secondary GPT boot chain
|
|
*
|
|
* \param [in] fd block dev file descriptor
|
|
* \param [in] boot Boot chain to switch to
|
|
*
|
|
* \return 0 on success
|
|
*
|
|
* ==========================================================================
|
|
*/
|
|
static int gpt2_set_boot_chain(int fd, enum boot_chain boot)
|
|
{
|
|
int64_t gpt2_header_offset;
|
|
uint64_t pentries_start_offset;
|
|
uint32_t gpt_header_size;
|
|
uint32_t pentry_size;
|
|
uint32_t pentries_array_size;
|
|
|
|
uint8_t *gpt_header = NULL;
|
|
uint8_t *pentries = NULL;
|
|
uint32_t crc;
|
|
uint32_t blk_size = 0;
|
|
int r;
|
|
|
|
if (ioctl(fd, BLKSSZGET, &blk_size) != 0) {
|
|
fprintf(stderr, "Failed to get GPT device block size: %s\n",
|
|
strerror(errno));
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
gpt_header = (uint8_t*)malloc(blk_size);
|
|
if (!gpt_header) {
|
|
fprintf(stderr, "Failed to allocate memory to hold GPT block\n");
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
gpt2_header_offset = lseek64(fd, 0, SEEK_END) - blk_size;
|
|
if (gpt2_header_offset < 0) {
|
|
fprintf(stderr, "Getting secondary GPT header offset failed: %s\n",
|
|
strerror(errno));
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
|
|
/* Read primary GPT header from block dev */
|
|
r = blk_rw(fd, 0, (uint64_t)blk_size, gpt_header, blk_size);
|
|
|
|
if (r) {
|
|
fprintf(stderr, "Failed to read primary GPT header from blk dev\n");
|
|
goto EXIT;
|
|
}
|
|
pentries_start_offset =
|
|
GET_8_BYTES(gpt_header + PENTRIES_OFFSET) * blk_size;
|
|
pentry_size = GET_4_BYTES(gpt_header + PENTRY_SIZE_OFFSET);
|
|
pentries_array_size =
|
|
GET_4_BYTES(gpt_header + PARTITION_COUNT_OFFSET) * pentry_size;
|
|
|
|
pentries = (uint8_t *) calloc(1, pentries_array_size);
|
|
if (pentries == NULL) {
|
|
fprintf(stderr,
|
|
"Failed to alloc memory for GPT partition entries array\n");
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
/* Read primary GPT partititon entries array from block dev */
|
|
r = blk_rw(fd, 0, pentries_start_offset, pentries, pentries_array_size);
|
|
if (r)
|
|
goto EXIT;
|
|
|
|
crc = 0; // crc32(0, pentries, pentries_array_size);
|
|
if (GET_4_BYTES(gpt_header + PARTITION_CRC_OFFSET) != crc) {
|
|
fprintf(stderr, "Primary GPT partition entries array CRC invalid\n");
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
|
|
/* Read secondary GPT header from block dev */
|
|
r = blk_rw(fd, 0, gpt2_header_offset, gpt_header, blk_size);
|
|
if (r)
|
|
goto EXIT;
|
|
|
|
gpt_header_size = GET_4_BYTES(gpt_header + HEADER_SIZE_OFFSET);
|
|
pentries_start_offset =
|
|
GET_8_BYTES(gpt_header + PENTRIES_OFFSET) * blk_size;
|
|
|
|
if (boot == BACKUP_BOOT) {
|
|
r = gpt_boot_chain_swap(pentries, pentries + pentries_array_size,
|
|
pentry_size);
|
|
if (r)
|
|
goto EXIT;
|
|
}
|
|
|
|
crc = 0; // crc32(0, pentries, pentries_array_size);
|
|
PUT_4_BYTES(gpt_header + PARTITION_CRC_OFFSET, crc);
|
|
|
|
/* header CRC is calculated with this field cleared */
|
|
PUT_4_BYTES(gpt_header + HEADER_CRC_OFFSET, 0);
|
|
crc = 0; // crc32(0, gpt_header, gpt_header_size);
|
|
PUT_4_BYTES(gpt_header + HEADER_CRC_OFFSET, crc);
|
|
|
|
/* Write the modified GPT header back to block dev */
|
|
r = blk_rw(fd, 1, gpt2_header_offset, gpt_header, blk_size);
|
|
if (!r)
|
|
/* Write the modified GPT partititon entries array back to block dev */
|
|
r = blk_rw(fd, 1, pentries_start_offset, pentries,
|
|
pentries_array_size);
|
|
|
|
EXIT:
|
|
if(gpt_header)
|
|
free(gpt_header);
|
|
if (pentries)
|
|
free(pentries);
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* ==========================================================================
|
|
*
|
|
* \brief Checks GPT state (header signature and CRC)
|
|
*
|
|
* \param [in] fd block dev file descriptor
|
|
* \param [in] gpt GPT header to be checked
|
|
* \param [out] state GPT header state
|
|
*
|
|
* \return 0 on success
|
|
*
|
|
* ==========================================================================
|
|
*/
|
|
static int gpt_get_state(int fd, enum gpt_instance gpt, enum gpt_state *state)
|
|
{
|
|
int64_t gpt_header_offset;
|
|
uint32_t gpt_header_size;
|
|
uint8_t *gpt_header = NULL;
|
|
uint32_t crc;
|
|
uint32_t blk_size = 0;
|
|
|
|
*state = GPT_OK;
|
|
|
|
if (ioctl(fd, BLKSSZGET, &blk_size) != 0) {
|
|
fprintf(stderr, "Failed to get GPT device block size: %s\n",
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
gpt_header = (uint8_t*)malloc(blk_size);
|
|
if (!gpt_header) {
|
|
fprintf(stderr, "gpt_get_state:Failed to alloc memory for header\n");
|
|
goto error;
|
|
}
|
|
if (gpt == PRIMARY_GPT)
|
|
gpt_header_offset = blk_size;
|
|
else {
|
|
gpt_header_offset = lseek64(fd, 0, SEEK_END) - blk_size;
|
|
if (gpt_header_offset < 0) {
|
|
fprintf(stderr, "gpt_get_state:Seek to end of GPT part fail\n");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
if (blk_rw(fd, 0, gpt_header_offset, gpt_header, blk_size)) {
|
|
fprintf(stderr, "gpt_get_state: blk_rw failed\n");
|
|
goto error;
|
|
}
|
|
if (memcmp(gpt_header, GPT_SIGNATURE, sizeof(GPT_SIGNATURE)))
|
|
*state = GPT_BAD_SIGNATURE;
|
|
gpt_header_size = GET_4_BYTES(gpt_header + HEADER_SIZE_OFFSET);
|
|
|
|
crc = GET_4_BYTES(gpt_header + HEADER_CRC_OFFSET);
|
|
/* header CRC is calculated with this field cleared */
|
|
PUT_4_BYTES(gpt_header + HEADER_CRC_OFFSET, 0);
|
|
if (crc32(0, gpt_header, gpt_header_size) != crc)
|
|
*state = GPT_BAD_CRC;
|
|
free(gpt_header);
|
|
return 0;
|
|
error:
|
|
if (gpt_header)
|
|
free(gpt_header);
|
|
return -1;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* ==========================================================================
|
|
*
|
|
* \brief Sets GPT header state (used to corrupt and fix GPT signature)
|
|
*
|
|
* \param [in] fd block dev file descriptor
|
|
* \param [in] gpt GPT header to be checked
|
|
* \param [in] state GPT header state to set (GPT_OK or GPT_BAD_SIGNATURE)
|
|
*
|
|
* \return 0 on success
|
|
*
|
|
* ==========================================================================
|
|
*/
|
|
static int gpt_set_state(int fd, enum gpt_instance gpt, enum gpt_state state)
|
|
{
|
|
int64_t gpt_header_offset;
|
|
uint32_t gpt_header_size;
|
|
uint8_t *gpt_header = NULL;
|
|
uint32_t crc;
|
|
uint32_t blk_size = 0;
|
|
|
|
if (ioctl(fd, BLKSSZGET, &blk_size) != 0) {
|
|
fprintf(stderr, "Failed to get GPT device block size: %s\n",
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
gpt_header = (uint8_t*)malloc(blk_size);
|
|
if (!gpt_header) {
|
|
fprintf(stderr, "Failed to alloc memory for gpt header\n");
|
|
goto error;
|
|
}
|
|
if (gpt == PRIMARY_GPT)
|
|
gpt_header_offset = blk_size;
|
|
else {
|
|
gpt_header_offset = lseek64(fd, 0, SEEK_END) - blk_size;
|
|
if (gpt_header_offset < 0) {
|
|
fprintf(stderr, "Failed to seek to end of GPT device\n");
|
|
goto error;
|
|
}
|
|
}
|
|
if (blk_rw(fd, 0, gpt_header_offset, gpt_header, blk_size)) {
|
|
fprintf(stderr, "Failed to r/w gpt header\n");
|
|
goto error;
|
|
}
|
|
if (state == GPT_OK)
|
|
memcpy(gpt_header, GPT_SIGNATURE, sizeof(GPT_SIGNATURE));
|
|
else if (state == GPT_BAD_SIGNATURE)
|
|
*gpt_header = 0;
|
|
else {
|
|
fprintf(stderr, "gpt_set_state: Invalid state\n");
|
|
goto error;
|
|
}
|
|
|
|
gpt_header_size = GET_4_BYTES(gpt_header + HEADER_SIZE_OFFSET);
|
|
|
|
/* header CRC is calculated with this field cleared */
|
|
PUT_4_BYTES(gpt_header + HEADER_CRC_OFFSET, 0);
|
|
crc = 0; // crc32(0, gpt_header, gpt_header_size);
|
|
PUT_4_BYTES(gpt_header + HEADER_CRC_OFFSET, crc);
|
|
|
|
if (blk_rw(fd, 1, gpt_header_offset, gpt_header, blk_size)) {
|
|
fprintf(stderr, "gpt_set_state: blk write failed\n");
|
|
goto error;
|
|
}
|
|
return 0;
|
|
error:
|
|
if(gpt_header)
|
|
free(gpt_header);
|
|
return -1;
|
|
}
|
|
|
|
int get_scsi_node_from_bootdevice(const char *bootdev_path,
|
|
char *sg_node_path,
|
|
size_t buf_size)
|
|
{
|
|
char sg_dir_path[PATH_MAX] = {0};
|
|
char real_path[PATH_MAX] = {0};
|
|
DIR *scsi_dir = NULL;
|
|
struct dirent *de;
|
|
int node_found = 0;
|
|
if (!bootdev_path || !sg_node_path) {
|
|
fprintf(stderr, "%s : invalid argument\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
if (readlink(bootdev_path, real_path, sizeof(real_path) - 1) < 0) {
|
|
fprintf(stderr, "failed to resolve link for %s(%s)\n",
|
|
bootdev_path,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
if(strlen(real_path) < PATH_TRUNCATE_LOC + 1){
|
|
fprintf(stderr, "Unrecognized path :%s:\n",
|
|
real_path);
|
|
goto error;
|
|
}
|
|
//For the safe side in case there are additional partitions on
|
|
//the XBL lun we truncate the name.
|
|
real_path[PATH_TRUNCATE_LOC] = '\0';
|
|
if(strlen(real_path) < LUN_NAME_START_LOC + 1){
|
|
fprintf(stderr, "Unrecognized truncated path :%s:\n",
|
|
real_path);
|
|
goto error;
|
|
}
|
|
//This will give us /dev/disk/sdb/device/scsi_generic
|
|
//which contains a file sgY whose name gives us the path
|
|
//to /dev/sgY which we return
|
|
snprintf(sg_dir_path, sizeof(sg_dir_path) - 1,
|
|
"/sys/block/%s/device/scsi_generic",
|
|
&real_path[LUN_NAME_START_LOC]);
|
|
scsi_dir = opendir(sg_dir_path);
|
|
if (!scsi_dir) {
|
|
fprintf(stderr, "%s : Failed to open %s(%s)\n",
|
|
__func__,
|
|
sg_dir_path,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
while((de = readdir(scsi_dir))) {
|
|
if (de->d_name[0] == '.')
|
|
continue;
|
|
else if (!strncmp(de->d_name, "sg\n", 2)) {
|
|
snprintf(sg_node_path,
|
|
buf_size -1,
|
|
"/dev/%s",
|
|
de->d_name);
|
|
fprintf(stderr, "%s:scsi generic node is :%s:\n",
|
|
__func__,
|
|
sg_node_path);
|
|
node_found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if(!node_found) {
|
|
fprintf(stderr,"%s: Unable to locate scsi generic node\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
closedir(scsi_dir);
|
|
return 0;
|
|
error:
|
|
if (scsi_dir)
|
|
closedir(scsi_dir);
|
|
return -1;
|
|
}
|
|
|
|
int set_boot_lun(char *sg_dev, uint8_t boot_lun_id)
|
|
{
|
|
int fd = -1;
|
|
int rc;
|
|
struct ufs_ioctl_query_data *data = NULL;
|
|
size_t ioctl_data_size = sizeof(struct ufs_ioctl_query_data) + UFS_ATTR_DATA_SIZE;
|
|
|
|
data = (struct ufs_ioctl_query_data*)malloc(ioctl_data_size);
|
|
if (!data) {
|
|
fprintf(stderr, "%s: Failed to alloc query data struct\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
memset(data, 0, ioctl_data_size);
|
|
data->opcode = UPIU_QUERY_OPCODE_WRITE_ATTR;
|
|
data->idn = QUERY_ATTR_IDN_BOOT_LU_EN;
|
|
data->buf_size = UFS_ATTR_DATA_SIZE;
|
|
data->buffer[0] = boot_lun_id;
|
|
fd = open(sg_dev, O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "%s: Failed to open %s(%s)\n",
|
|
__func__,
|
|
sg_dev,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
rc = ioctl(fd, UFS_IOCTL_QUERY, data);
|
|
if (rc) {
|
|
fprintf(stderr, "%s: UFS query ioctl failed(%s)\n",
|
|
__func__,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
close(fd);
|
|
free(data);
|
|
return 0;
|
|
error:
|
|
if (fd >= 0)
|
|
close(fd);
|
|
if (data)
|
|
free(data);
|
|
return -1;
|
|
}
|
|
|
|
//Swtich betwieen using either the primary or the backup
|
|
//boot LUN for boot. This is required since UFS boot partitions
|
|
//cannot have a backup GPT which is what we use for failsafe
|
|
//updates of the other 'critical' partitions. This function will
|
|
//not be invoked for emmc targets and on UFS targets is only required
|
|
//to be invoked for XBL.
|
|
//
|
|
//The algorithm to do this is as follows:
|
|
//- Find the real block device(eg: /dev/disk/sdb) that corresponds
|
|
// to the /dev/disk/bootdevice/by-name/xbl(bak) symlink
|
|
//
|
|
//- Once we have the block device 'node' name(sdb in the above example)
|
|
// use this node to to locate the scsi generic device that represents
|
|
// it by checking the file /sys/block/sdb/device/scsi_generic/sgY
|
|
//
|
|
//- Once we locate sgY we call the query ioctl on /dev/sgy to switch
|
|
//the boot lun to either LUNA or LUNB
|
|
int gpt_utils_set_xbl_boot_partition(enum boot_chain chain)
|
|
{
|
|
struct stat st;
|
|
///sys/block/sdX/device/scsi_generic/
|
|
char sg_dev_node[PATH_MAX] = {0};
|
|
uint8_t boot_lun_id = 0;
|
|
const char *boot_dev = NULL;
|
|
|
|
if (chain == BACKUP_BOOT) {
|
|
boot_lun_id = BOOT_LUN_B_ID;
|
|
if (!stat(XBL_BACKUP, &st))
|
|
boot_dev = XBL_BACKUP;
|
|
else if (!stat(XBL_AB_SECONDARY, &st))
|
|
boot_dev = XBL_AB_SECONDARY;
|
|
else {
|
|
fprintf(stderr, "%s: Failed to locate secondary xbl\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
} else if (chain == NORMAL_BOOT) {
|
|
boot_lun_id = BOOT_LUN_A_ID;
|
|
if (!stat(XBL_PRIMARY, &st))
|
|
boot_dev = XBL_PRIMARY;
|
|
else if (!stat(XBL_AB_PRIMARY, &st))
|
|
boot_dev = XBL_AB_PRIMARY;
|
|
else {
|
|
fprintf(stderr, "%s: Failed to locate primary xbl\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
} else {
|
|
fprintf(stderr, "%s: Invalid boot chain id\n", __func__);
|
|
goto error;
|
|
}
|
|
//We need either both xbl and xblbak or both xbl_a and xbl_b to exist at
|
|
//the same time. If not the current configuration is invalid.
|
|
if((stat(XBL_PRIMARY, &st) ||
|
|
stat(XBL_BACKUP, &st)) &&
|
|
(stat(XBL_AB_PRIMARY, &st) ||
|
|
stat(XBL_AB_SECONDARY, &st))) {
|
|
fprintf(stderr, "%s:primary/secondary XBL prt not found(%s)\n",
|
|
__func__,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
fprintf(stderr, "%s: setting %s lun as boot lun\n",
|
|
__func__,
|
|
boot_dev);
|
|
if (get_scsi_node_from_bootdevice(boot_dev,
|
|
sg_dev_node,
|
|
sizeof(sg_dev_node))) {
|
|
fprintf(stderr, "%s: Failed to get scsi node path for xblbak\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
if (set_boot_lun(sg_dev_node, boot_lun_id)) {
|
|
fprintf(stderr, "%s: Failed to set xblbak as boot partition\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
return 0;
|
|
error:
|
|
return -1;
|
|
}
|
|
|
|
int gpt_utils_is_ufs_device()
|
|
{
|
|
return 1; // Stubbed to "true" because we dont' support emmc for now
|
|
// char bootdevice[PROPERTY_VALUE_MAX] = {0};
|
|
// property_get("ro.boot.bootdevice\n", bootdevice, "N/A");
|
|
// if (strlen(bootdevice) < strlen(".ufshc") + 1)
|
|
// return 0;
|
|
// return (!strncmp(&bootdevice[strlen(bootdevice) - strlen(".ufshc")],
|
|
// ".ufshc\n",
|
|
// sizeof(".ufshc")));
|
|
}
|
|
//dev_path is the path to the block device that contains the GPT image that
|
|
//needs to be updated. This would be the device which holds one or more critical
|
|
//boot partitions and their backups. In the case of EMMC this function would
|
|
//be invoked only once on /dev/disk/mmcblk1 since it holds the GPT image
|
|
//containing all the partitions For UFS devices it could potentially be
|
|
//invoked multiple times, once for each LUN containing critical image(s) and
|
|
//their backups
|
|
int prepare_partitions(enum boot_update_stage stage, const char *dev_path)
|
|
{
|
|
int r = 0;
|
|
int fd = -1;
|
|
int is_ufs = gpt_utils_is_ufs_device();
|
|
enum gpt_state gpt_prim, gpt_second = GPT_OK;
|
|
enum boot_update_stage internal_stage;
|
|
struct stat xbl_partition_stat;
|
|
|
|
if (!dev_path) {
|
|
fprintf(stderr, "%s: Invalid dev_path\n",
|
|
__func__);
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
fd = open(dev_path, O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "%s: Opening '%s' failed: %s\n",
|
|
__func__,
|
|
BLK_DEV_FILE,
|
|
strerror(errno));
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
r = gpt_get_state(fd, PRIMARY_GPT, &gpt_prim) ||
|
|
gpt_get_state(fd, SECONDARY_GPT, &gpt_second);
|
|
if (r) {
|
|
fprintf(stderr, "%s: Getting GPT headers state failed\n",
|
|
__func__);
|
|
goto EXIT;
|
|
}
|
|
|
|
/* These 2 combinations are unexpected and unacceptable */
|
|
if (gpt_prim == GPT_BAD_CRC || gpt_second == GPT_BAD_CRC) {
|
|
fprintf(stderr, "%s: GPT headers CRC corruption detected, aborting\n",
|
|
__func__);
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
if (gpt_prim == GPT_BAD_SIGNATURE && gpt_second == GPT_BAD_SIGNATURE) {
|
|
fprintf(stderr, "%s: Both GPT headers corrupted, aborting\n",
|
|
__func__);
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
|
|
/* Check internal update stage according GPT headers' state */
|
|
if (gpt_prim == GPT_OK && gpt_second == GPT_OK)
|
|
internal_stage = UPDATE_MAIN;
|
|
else if (gpt_prim == GPT_BAD_SIGNATURE)
|
|
internal_stage = UPDATE_BACKUP;
|
|
else if (gpt_second == GPT_BAD_SIGNATURE)
|
|
internal_stage = UPDATE_FINALIZE;
|
|
else {
|
|
fprintf(stderr, "%s: Abnormal GPTs state: primary (%d), secondary (%d), "
|
|
"aborting\n", __func__, gpt_prim, gpt_second);
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
|
|
/* Stage already set - ready for update, exitting */
|
|
if ((int) stage == (int) internal_stage - 1)
|
|
goto EXIT;
|
|
/* Unexpected stage given */
|
|
if (stage != internal_stage) {
|
|
r = -1;
|
|
goto EXIT;
|
|
}
|
|
|
|
switch (stage) {
|
|
case UPDATE_MAIN:
|
|
if (is_ufs) {
|
|
if(stat(XBL_PRIMARY, &xbl_partition_stat)||
|
|
stat(XBL_BACKUP, &xbl_partition_stat)){
|
|
//Non fatal error. Just means this target does not
|
|
//use XBL but relies on sbl whose update is handled
|
|
//by the normal methods.
|
|
fprintf(stderr, "%s: xbl part not found(%s).Assuming sbl in use\n",
|
|
__func__,
|
|
strerror(errno));
|
|
} else {
|
|
//Switch the boot lun so that backup boot LUN is used
|
|
r = gpt_utils_set_xbl_boot_partition(BACKUP_BOOT);
|
|
if(r){
|
|
fprintf(stderr, "%s: Failed to set xbl backup partition as boot\n",
|
|
__func__);
|
|
goto EXIT;
|
|
}
|
|
}
|
|
}
|
|
//Fix up the backup GPT table so that it actually points to
|
|
//the backup copy of the boot critical images
|
|
fprintf(stderr, "%s: Preparing for primary partition update\n",
|
|
__func__);
|
|
r = gpt2_set_boot_chain(fd, BACKUP_BOOT);
|
|
if (r) {
|
|
if (r < 0)
|
|
fprintf(stderr,
|
|
"%s: Setting secondary GPT to backup boot failed\n",
|
|
__func__);
|
|
/* No backup partitions - do not corrupt GPT, do not flag error */
|
|
else
|
|
r = 0;
|
|
goto EXIT;
|
|
}
|
|
//corrupt the primary GPT so that the backup(which now points to
|
|
//the backup boot partitions is used)
|
|
r = gpt_set_state(fd, PRIMARY_GPT, GPT_BAD_SIGNATURE);
|
|
if (r) {
|
|
fprintf(stderr, "%s: Corrupting primary GPT header failed\n",
|
|
__func__);
|
|
goto EXIT;
|
|
}
|
|
break;
|
|
case UPDATE_BACKUP:
|
|
if (is_ufs) {
|
|
if(stat(XBL_PRIMARY, &xbl_partition_stat)||
|
|
stat(XBL_BACKUP, &xbl_partition_stat)){
|
|
//Non fatal error. Just means this target does not
|
|
//use XBL but relies on sbl whose update is handled
|
|
//by the normal methods.
|
|
fprintf(stderr, "%s: xbl part not found(%s).Assuming sbl in use\n",
|
|
__func__,
|
|
strerror(errno));
|
|
} else {
|
|
//Switch the boot lun so that backup boot LUN is used
|
|
r = gpt_utils_set_xbl_boot_partition(NORMAL_BOOT);
|
|
if(r) {
|
|
fprintf(stderr, "%s: Failed to set xbl backup partition as boot\n",
|
|
__func__);
|
|
goto EXIT;
|
|
}
|
|
}
|
|
}
|
|
//Fix the primary GPT header so that is used
|
|
fprintf(stderr, "%s: Preparing for backup partition update\n",
|
|
__func__);
|
|
r = gpt_set_state(fd, PRIMARY_GPT, GPT_OK);
|
|
if (r) {
|
|
fprintf(stderr, "%s: Fixing primary GPT header failed\n",
|
|
__func__);
|
|
goto EXIT;
|
|
}
|
|
//Corrupt the scondary GPT header
|
|
r = gpt_set_state(fd, SECONDARY_GPT, GPT_BAD_SIGNATURE);
|
|
if (r) {
|
|
fprintf(stderr, "%s: Corrupting secondary GPT header failed\n",
|
|
__func__);
|
|
goto EXIT;
|
|
}
|
|
break;
|
|
case UPDATE_FINALIZE:
|
|
//Undo the changes we had made in the UPDATE_MAIN stage so that the
|
|
//primary/backup GPT headers once again point to the same set of
|
|
//partitions
|
|
fprintf(stderr, "%s: Finalizing partitions\n",
|
|
__func__);
|
|
r = gpt2_set_boot_chain(fd, NORMAL_BOOT);
|
|
if (r < 0) {
|
|
fprintf(stderr, "%s: Setting secondary GPT to normal boot failed\n",
|
|
__func__);
|
|
goto EXIT;
|
|
}
|
|
|
|
r = gpt_set_state(fd, SECONDARY_GPT, GPT_OK);
|
|
if (r) {
|
|
fprintf(stderr, "%s: Fixing secondary GPT header failed\n",
|
|
__func__);
|
|
goto EXIT;
|
|
}
|
|
break;
|
|
default:;
|
|
}
|
|
|
|
EXIT:
|
|
if (fd >= 0) {
|
|
fsync(fd);
|
|
close(fd);
|
|
}
|
|
return r;
|
|
}
|
|
|
|
int add_lun_to_update_list(char *lun_path, struct update_data *dat)
|
|
{
|
|
uint32_t i = 0;
|
|
struct stat st;
|
|
if (!lun_path || !dat){
|
|
fprintf(stderr, "%s: Invalid data\n",
|
|
__func__);
|
|
return -1;
|
|
}
|
|
if (stat(lun_path, &st)) {
|
|
fprintf(stderr, "%s: Unable to access %s. Skipping adding to list\n",
|
|
__func__,
|
|
lun_path);
|
|
return -1;
|
|
}
|
|
if (dat->num_valid_entries == 0) {
|
|
fprintf(stderr, "%s: Copying %s into lun_list[%d]\n",
|
|
__func__,
|
|
lun_path,
|
|
i);
|
|
strlcpy(dat->lun_list[0], lun_path,
|
|
PATH_MAX * sizeof(char));
|
|
dat->num_valid_entries = 1;
|
|
} else {
|
|
for (i = 0; (i < dat->num_valid_entries) &&
|
|
(dat->num_valid_entries < MAX_LUNS - 1); i++) {
|
|
//Check if the current LUN is not already part
|
|
//of the lun list
|
|
if (!strncmp(lun_path,dat->lun_list[i],
|
|
strlen(dat->lun_list[i]))) {
|
|
//LUN already in list..Return
|
|
return 0;
|
|
}
|
|
}
|
|
fprintf(stderr, "%s: Copying %s into lun_list[%d]\n",
|
|
__func__,
|
|
lun_path,
|
|
dat->num_valid_entries);
|
|
//Add LUN path lun list
|
|
strlcpy(dat->lun_list[dat->num_valid_entries], lun_path,
|
|
PATH_MAX * sizeof(char));
|
|
dat->num_valid_entries++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int prepare_boot_update(enum boot_update_stage stage)
|
|
{
|
|
int is_ufs = gpt_utils_is_ufs_device();
|
|
struct stat ufs_dir_stat;
|
|
struct update_data data;
|
|
int rcode = 0;
|
|
uint32_t i = 0;
|
|
int is_error = 0;
|
|
const char ptn_swap_list[][MAX_GPT_NAME_SIZE] = { PTN_SWAP_LIST };
|
|
//Holds /dev/disk/bootdevice/by-name/*bak entry
|
|
char buf[PATH_MAX] = {0};
|
|
//Holds the resolved path of the symlink stored in buf
|
|
char real_path[PATH_MAX] = {0};
|
|
|
|
if (!is_ufs) {
|
|
//emmc device. Just pass in path to mmcblk0
|
|
return prepare_partitions(stage, BLK_DEV_FILE);
|
|
} else {
|
|
//Now we need to find the list of LUNs over
|
|
//which the boot critical images are spread
|
|
//and set them up for failsafe updates.To do
|
|
//this we find out where the symlinks for the
|
|
//each of the paths under
|
|
///dev/disk/bootdevice/by-name/PTN_SWAP_LIST
|
|
//actually point to.
|
|
fprintf(stderr, "%s: Running on a UFS device\n",
|
|
__func__);
|
|
memset(&data, '\0', sizeof(struct update_data));
|
|
for (i=0; i < ARRAY_SIZE(ptn_swap_list); i++) {
|
|
//XBL on UFS does not follow the convention
|
|
//of being loaded based on well known GUID'S.
|
|
//We take care of switching the UFS boot LUN
|
|
//explicitly later on.
|
|
if (!strncmp(ptn_swap_list[i],
|
|
PTN_XBL,
|
|
strlen(PTN_XBL)))
|
|
continue;
|
|
snprintf(buf, sizeof(buf),
|
|
"%s/%sbak\n",
|
|
BOOT_DEV_DIR,
|
|
ptn_swap_list[i]);
|
|
if (stat(buf, &ufs_dir_stat)) {
|
|
continue;
|
|
}
|
|
if (readlink(buf, real_path, sizeof(real_path) - 1) < 0)
|
|
{
|
|
fprintf(stderr, "%s: readlink error. Skipping %s\n",
|
|
__func__,
|
|
strerror(errno));
|
|
} else {
|
|
if(strlen(real_path) < PATH_TRUNCATE_LOC + 1){
|
|
fprintf(stderr, "Unknown path.Skipping :%s:\n",
|
|
real_path);
|
|
} else {
|
|
real_path[PATH_TRUNCATE_LOC] = '\0';
|
|
add_lun_to_update_list(real_path, &data);
|
|
}
|
|
}
|
|
memset(buf, '\0', sizeof(buf));
|
|
memset(real_path, '\0', sizeof(real_path));
|
|
}
|
|
for (i=0; i < data.num_valid_entries; i++) {
|
|
fprintf(stderr, "%s: Preparing %s for update stage %d\n",
|
|
__func__,
|
|
data.lun_list[i],
|
|
stage);
|
|
rcode = prepare_partitions(stage, data.lun_list[i]);
|
|
if (rcode != 0)
|
|
{
|
|
fprintf(stderr, "%s: Failed to prepare %s.Continuing..\n",
|
|
__func__,
|
|
data.lun_list[i]);
|
|
is_error = 1;
|
|
}
|
|
}
|
|
}
|
|
if (is_error)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
//Given a parttion name(eg: rpm) get the path to the block device that
|
|
//represents the GPT disk the partition resides on. In the case of emmc it
|
|
//would be the default emmc dev(/dev/mmcblk0). In the case of UFS we look
|
|
//through the /dev/disk/bootdevice/by-name/ tree for partname, and resolve
|
|
//the path to the LUN from there.
|
|
static int get_dev_path_from_partition_name(const char *partname,
|
|
char *buf,
|
|
size_t buflen)
|
|
{
|
|
struct stat st;
|
|
int rc;
|
|
char path[PATH_MAX] = {0};
|
|
if (!partname || !buf || buflen < ((PATH_TRUNCATE_LOC) + 1)) {
|
|
fprintf(stderr, "%s: Invalid argument\n", __func__);
|
|
goto error;
|
|
}
|
|
if (gpt_utils_is_ufs_device()) {
|
|
//Need to find the lun that holds partition partname
|
|
snprintf(path, sizeof(path),
|
|
"%s/%s",
|
|
BOOT_DEV_DIR,
|
|
partname);
|
|
printf("PATH: #%s#\n", path);
|
|
// if (rc = stat(path, &st)) {
|
|
// printf("stat failed: errno=%d\n", errno);
|
|
// goto error;
|
|
// }
|
|
buf = realpath(path, buf);
|
|
if (!buf)
|
|
{
|
|
printf("readlink failed\n");
|
|
goto error;
|
|
} else {
|
|
buf[PATH_TRUNCATE_LOC] = '\0';
|
|
}
|
|
printf("readlink path: %s, rc = %d, errno=%d\n", buf, rc, errno);
|
|
} else {
|
|
snprintf(buf, buflen, "/dev/mmcblk0");
|
|
}
|
|
return 0;
|
|
|
|
error:
|
|
return -1;
|
|
}
|
|
|
|
int gpt_utils_get_partition_map(vector<string>& ptn_list,
|
|
map<string, vector<string>>& partition_map) {
|
|
char devpath[PATH_MAX] = {'\0'};
|
|
map<string, vector<string>>::iterator it;
|
|
if (ptn_list.size() < 1) {
|
|
fprintf(stderr, "%s: Invalid ptn list\n", __func__);
|
|
return -1;
|
|
}
|
|
//Go through the passed in list
|
|
for (uint32_t i = 0; i < ptn_list.size(); i++)
|
|
{
|
|
//Key in the map is the path to the device that holds the
|
|
//partition
|
|
if (get_dev_path_from_partition_name(ptn_list[i].c_str(),
|
|
devpath,
|
|
sizeof(devpath))) {
|
|
//Not necessarily an error. The partition may just
|
|
//not be present.
|
|
continue;
|
|
}
|
|
string path = devpath;
|
|
it = partition_map.find(path);
|
|
if (it != partition_map.end()) {
|
|
it->second.push_back(ptn_list[i]);
|
|
} else {
|
|
vector<string> str_vec;
|
|
str_vec.push_back( ptn_list[i]);
|
|
partition_map.insert(pair<string, vector<string>>
|
|
(path, str_vec));
|
|
}
|
|
memset(devpath, '\0', sizeof(devpath));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
//Get the block size of the disk represented by decsriptor fd
|
|
static uint32_t gpt_get_block_size(int fd)
|
|
{
|
|
uint32_t block_size = 0;
|
|
if (fd < 0) {
|
|
fprintf(stderr, "%s: invalid descriptor\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
if (ioctl(fd, BLKSSZGET, &block_size) != 0) {
|
|
fprintf(stderr, "%s: Failed to get GPT dev block size : %s\n",
|
|
__func__,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
return block_size;
|
|
error:
|
|
return 0;
|
|
}
|
|
|
|
//Write the GPT header present in the passed in buffer back to the
|
|
//disk represented by fd
|
|
static int gpt_set_header(uint8_t *gpt_header, int fd,
|
|
enum gpt_instance instance)
|
|
{
|
|
uint32_t block_size = 0;
|
|
off_t gpt_header_offset = 0;
|
|
if (!gpt_header || fd < 0) {
|
|
fprintf(stderr, "%s: Invalid arguments\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
block_size = gpt_get_block_size(fd);
|
|
printf("%s: Block size is : %d\n", __func__, block_size);
|
|
if (block_size == 0) {
|
|
fprintf(stderr, "%s: Failed to get block size\n", __func__);
|
|
goto error;
|
|
}
|
|
if (instance == PRIMARY_GPT)
|
|
gpt_header_offset = block_size;
|
|
else
|
|
gpt_header_offset = lseek64(fd, 0, SEEK_END) - block_size;
|
|
if (gpt_header_offset <= 0) {
|
|
fprintf(stderr, "%s: Failed to get gpt header offset\n",__func__);
|
|
goto error;
|
|
}
|
|
printf("%s: Writing back header to offset %ld\n", __func__,
|
|
gpt_header_offset);
|
|
if (blk_rw(fd, 1, gpt_header_offset, gpt_header, block_size)) {
|
|
fprintf(stderr, "%s: Failed to write back GPT header\n", __func__);
|
|
goto error;
|
|
}
|
|
return 0;
|
|
error:
|
|
return -1;
|
|
}
|
|
|
|
//Read out the GPT header for the disk that contains the partition partname
|
|
static uint8_t* gpt_get_header(const char *partname, enum gpt_instance instance)
|
|
{
|
|
uint8_t* hdr = NULL;
|
|
char devpath[PATH_MAX] = {0};
|
|
uint64_t hdr_offset = 0;
|
|
uint32_t block_size = 0;
|
|
int fd = -1;
|
|
if (!partname) {
|
|
fprintf(stderr, "%s: Invalid partition name\n", __func__);
|
|
goto error;
|
|
}
|
|
if (get_dev_path_from_partition_name(partname, devpath, sizeof(devpath))
|
|
!= 0) {
|
|
fprintf(stderr, "%s: Failed to resolve path for %s\n",
|
|
__func__,
|
|
partname);
|
|
goto error;
|
|
}
|
|
fd = open(devpath, O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "%s: Failed to open %s : %s\n",
|
|
__func__,
|
|
devpath,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
block_size = gpt_get_block_size(fd);
|
|
if (block_size == 0)
|
|
{
|
|
fprintf(stderr, "%s: Failed to get gpt block size for %s\n",
|
|
__func__,
|
|
partname);
|
|
goto error;
|
|
}
|
|
|
|
hdr = (uint8_t*)calloc(block_size, 1);
|
|
printf("%s(): devpath = %s, block_size = %u, hdr[0] = 0x%x, hdr[1] = 0x%x\n", __func__, devpath, block_size, hdr[0], hdr[1]);
|
|
if (!hdr) {
|
|
fprintf(stderr, "%s: Failed to allocate memory for gpt header\n",
|
|
__func__);
|
|
}
|
|
if (instance == PRIMARY_GPT)
|
|
hdr_offset = block_size;
|
|
else {
|
|
hdr_offset = lseek64(fd, 0, SEEK_END) - block_size;
|
|
}
|
|
if (hdr_offset < 0) {
|
|
fprintf(stderr, "%s: Failed to get gpt header offset\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
if (blk_rw(fd, 0, hdr_offset, hdr, block_size)) {
|
|
fprintf(stderr, "%s: Failed to read GPT header from device\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
close(fd);
|
|
return hdr;
|
|
error:
|
|
if (fd >= 0)
|
|
close(fd);
|
|
if (hdr)
|
|
free(hdr);
|
|
return NULL;
|
|
}
|
|
|
|
//Returns the partition entry array based on the
|
|
//passed in buffer which contains the gpt header.
|
|
//The fd here is the descriptor for the 'disk' which
|
|
//holds the partition
|
|
static uint8_t* gpt_get_pentry_arr(uint8_t *hdr, int fd)
|
|
{
|
|
uint64_t pentries_start = 0;
|
|
uint32_t pentry_size = 0;
|
|
uint32_t block_size = 0;
|
|
uint32_t pentries_arr_size = 0;
|
|
uint8_t *pentry_arr = NULL;
|
|
int rc = 0;
|
|
if (!hdr) {
|
|
fprintf(stderr, "%s: Invalid header\n", __func__);
|
|
goto error;
|
|
}
|
|
if (fd < 0) {
|
|
fprintf(stderr, "%s: Invalid fd\n", __func__);
|
|
goto error;
|
|
}
|
|
block_size = gpt_get_block_size(fd);
|
|
if (!block_size) {
|
|
fprintf(stderr, "%s: Failed to get gpt block size for\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
pentries_start = GET_8_BYTES(hdr + PENTRIES_OFFSET) * block_size;
|
|
pentry_size = GET_4_BYTES(hdr + PENTRY_SIZE_OFFSET);
|
|
pentries_arr_size =
|
|
GET_4_BYTES(hdr + PARTITION_COUNT_OFFSET) * pentry_size;
|
|
pentry_arr = (uint8_t*)calloc(1, pentries_arr_size);
|
|
if (!pentry_arr) {
|
|
fprintf(stderr, "%s: Failed to allocate memory for partition array\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
printf("hdr + PENTRIES_OFFSET = %lu, pentries_start: %lu\n", GET_8_BYTES(hdr + PENTRIES_OFFSET), pentries_start);
|
|
rc = blk_rw(fd, 0,
|
|
pentries_start,
|
|
pentry_arr,
|
|
pentries_arr_size);
|
|
if (rc) {
|
|
fprintf(stderr, "%s: Failed to read partition entry array\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
return pentry_arr;
|
|
error:
|
|
if (pentry_arr)
|
|
free(pentry_arr);
|
|
return NULL;
|
|
}
|
|
|
|
static int gpt_set_pentry_arr(uint8_t *hdr, int fd, uint8_t* arr)
|
|
{
|
|
uint32_t block_size = 0;
|
|
uint64_t pentries_start = 0;
|
|
uint32_t pentry_size = 0;
|
|
uint32_t pentries_arr_size = 0;
|
|
int rc = 0;
|
|
if (!hdr || fd < 0 || !arr) {
|
|
fprintf(stderr, "%s: Invalid argument\n", __func__);
|
|
goto error;
|
|
}
|
|
block_size = gpt_get_block_size(fd);
|
|
if (!block_size) {
|
|
fprintf(stderr, "%s: Failed to get gpt block size for\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
printf("%s : Block size is %d\n", __func__, block_size);
|
|
pentries_start = GET_8_BYTES(hdr + PENTRIES_OFFSET) * block_size;
|
|
pentry_size = GET_4_BYTES(hdr + PENTRY_SIZE_OFFSET);
|
|
pentries_arr_size =
|
|
GET_4_BYTES(hdr + PARTITION_COUNT_OFFSET) * pentry_size;
|
|
printf("%s: Writing partition entry array of size %d to offset %" PRIu64 "\n",
|
|
__func__,
|
|
pentries_arr_size,
|
|
pentries_start);
|
|
printf("pentries_start: %lu\n", pentries_start);
|
|
rc = blk_rw(fd, 1,
|
|
pentries_start,
|
|
arr,
|
|
pentries_arr_size);
|
|
if (rc) {
|
|
fprintf(stderr, "%s: Failed to read partition entry array\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
return 0;
|
|
error:
|
|
return -1;
|
|
}
|
|
|
|
|
|
|
|
//Allocate a handle used by calls to the "gpt_disk" api's
|
|
struct gpt_disk * gpt_disk_alloc()
|
|
{
|
|
struct gpt_disk *disk;
|
|
disk = (struct gpt_disk *)malloc(sizeof(struct gpt_disk));
|
|
if (!disk) {
|
|
fprintf(stderr, "%s: Failed to allocate memory\n", __func__);
|
|
goto end;
|
|
}
|
|
memset(disk, 0, sizeof(struct gpt_disk));
|
|
end:
|
|
return disk;
|
|
}
|
|
|
|
//Free previously allocated/initialized handle
|
|
void gpt_disk_free(struct gpt_disk *disk)
|
|
{
|
|
if (!disk)
|
|
return;
|
|
if (disk->hdr)
|
|
free(disk->hdr);
|
|
if (disk->hdr_bak)
|
|
free(disk->hdr_bak);
|
|
if (disk->pentry_arr)
|
|
free(disk->pentry_arr);
|
|
if (disk->pentry_arr_bak)
|
|
free(disk->pentry_arr_bak);
|
|
free(disk);
|
|
return;
|
|
}
|
|
|
|
//fills up the passed in gpt_disk struct with information about the
|
|
//disk represented by path dev. Returns 0 on success and -1 on error.
|
|
int gpt_disk_get_disk_info(const char *dev, struct gpt_disk *dsk)
|
|
{
|
|
struct gpt_disk *disk = NULL;
|
|
int fd = -1;
|
|
uint32_t gpt_header_size = 0;
|
|
|
|
if (!dsk || !dev) {
|
|
fprintf(stderr, "%s: Invalid arguments\n", __func__);
|
|
goto error;
|
|
}
|
|
disk = dsk;
|
|
disk->hdr = gpt_get_header(dev, PRIMARY_GPT);
|
|
if (!disk->hdr) {
|
|
fprintf(stderr, "%s: Failed to get primary header\n", __func__);
|
|
goto error;
|
|
}
|
|
gpt_header_size = GET_4_BYTES(disk->hdr + HEADER_SIZE_OFFSET);
|
|
// FIXME: pointer offsets crc bleh
|
|
disk->hdr_crc = 0; //crc32(0, disk->hdr, gpt_header_size);
|
|
disk->hdr_bak = gpt_get_header(dev, PRIMARY_GPT);
|
|
if (!disk->hdr_bak) {
|
|
fprintf(stderr, "%s: Failed to get backup header\n", __func__);
|
|
goto error;
|
|
}
|
|
disk->hdr_bak_crc = 0; //crc32(0, disk->hdr_bak, gpt_header_size);
|
|
|
|
//Descriptor for the block device. We will use this for further
|
|
//modifications to the partition table
|
|
if (get_dev_path_from_partition_name(dev,
|
|
disk->devpath,
|
|
sizeof(disk->devpath)) != 0) {
|
|
fprintf(stderr, "%s: Failed to resolve path for %s\n",
|
|
__func__,
|
|
dev);
|
|
goto error;
|
|
}
|
|
fd = open(disk->devpath, O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "%s: Failed to open %s: %s\n",
|
|
__func__,
|
|
disk->devpath,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
disk->pentry_arr = gpt_get_pentry_arr(disk->hdr, fd);
|
|
if (!disk->pentry_arr) {
|
|
fprintf(stderr, "%s: Failed to obtain partition entry array\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
disk->pentry_arr_bak = gpt_get_pentry_arr(disk->hdr_bak, fd);
|
|
if (!disk->pentry_arr_bak) {
|
|
fprintf(stderr, "%s: Failed to obtain backup partition entry array\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
disk->pentry_size = GET_4_BYTES(disk->hdr + PENTRY_SIZE_OFFSET);
|
|
disk->pentry_arr_size =
|
|
GET_4_BYTES(disk->hdr + PARTITION_COUNT_OFFSET) *
|
|
disk->pentry_size;
|
|
disk->pentry_arr_crc = GET_4_BYTES(disk->hdr + PARTITION_CRC_OFFSET);
|
|
disk->pentry_arr_bak_crc = GET_4_BYTES(disk->hdr_bak +
|
|
PARTITION_CRC_OFFSET);
|
|
disk->block_size = gpt_get_block_size(fd);
|
|
close(fd);
|
|
disk->is_initialized = GPT_DISK_INIT_MAGIC;
|
|
return 0;
|
|
error:
|
|
if (fd >= 0)
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
//Get pointer to partition entry from a allocated gpt_disk structure
|
|
uint8_t* gpt_disk_get_pentry(struct gpt_disk *disk,
|
|
const char *partname,
|
|
enum gpt_instance instance)
|
|
{
|
|
uint8_t *ptn_arr = NULL;
|
|
if (!disk || !partname || disk->is_initialized != GPT_DISK_INIT_MAGIC) {
|
|
fprintf(stderr, "%s: Invalid argument\n",__func__);
|
|
goto error;
|
|
}
|
|
ptn_arr = (instance == PRIMARY_GPT) ?
|
|
disk->pentry_arr : disk->pentry_arr_bak;
|
|
return (gpt_pentry_seek(partname, ptn_arr,
|
|
ptn_arr + disk->pentry_arr_size ,
|
|
disk->pentry_size));
|
|
error:
|
|
return NULL;
|
|
}
|
|
|
|
//Update CRC values for the various components of the gpt_disk
|
|
//structure. This function should be called after any of the fields
|
|
//have been updated before the structure contents are written back to
|
|
//disk.
|
|
int gpt_disk_update_crc(struct gpt_disk *disk)
|
|
{
|
|
uint32_t gpt_header_size = 0;
|
|
if (!disk || (disk->is_initialized != GPT_DISK_INIT_MAGIC)) {
|
|
fprintf(stderr, "%s: invalid argument\n", __func__);
|
|
goto error;
|
|
}
|
|
//Recalculate the CRC of the primary partiton array
|
|
disk->pentry_arr_crc = 0; // crc32(0,
|
|
//disk->pentry_arr,
|
|
//disk->pentry_arr_size);
|
|
//Recalculate the CRC of the backup partition array
|
|
disk->pentry_arr_bak_crc = 0; // crc32(0,
|
|
//disk->pentry_arr_bak,
|
|
//disk->pentry_arr_size);
|
|
//Update the partition CRC value in the primary GPT header
|
|
PUT_4_BYTES(disk->hdr + PARTITION_CRC_OFFSET, disk->pentry_arr_crc);
|
|
//Update the partition CRC value in the backup GPT header
|
|
PUT_4_BYTES(disk->hdr_bak + PARTITION_CRC_OFFSET,
|
|
disk->pentry_arr_bak_crc);
|
|
//Update the CRC value of the primary header
|
|
gpt_header_size = GET_4_BYTES(disk->hdr + HEADER_SIZE_OFFSET);
|
|
//Header CRC is calculated with its own CRC field set to 0
|
|
PUT_4_BYTES(disk->hdr + HEADER_CRC_OFFSET, 0);
|
|
PUT_4_BYTES(disk->hdr_bak + HEADER_CRC_OFFSET, 0);
|
|
disk->hdr_crc = 0; // crc32(0, disk->hdr, gpt_header_size);
|
|
disk->hdr_bak_crc = 0; // crc32(0, disk->hdr_bak, gpt_header_size);
|
|
PUT_4_BYTES(disk->hdr + HEADER_CRC_OFFSET, disk->hdr_crc);
|
|
PUT_4_BYTES(disk->hdr_bak + HEADER_CRC_OFFSET, disk->hdr_bak_crc);
|
|
return 0;
|
|
error:
|
|
return -1;
|
|
}
|
|
|
|
//Write the contents of struct gpt_disk back to the actual disk
|
|
int gpt_disk_commit(struct gpt_disk *disk)
|
|
{
|
|
int fd = -1;
|
|
if (!disk || (disk->is_initialized != GPT_DISK_INIT_MAGIC)){
|
|
fprintf(stderr, "%s: Invalid args\n", __func__);
|
|
goto error;
|
|
}
|
|
fd = open(disk->devpath, O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "%s: Failed to open %s: %s\n",
|
|
__func__,
|
|
disk->devpath,
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
printf("%s: Writing back primary GPT header\n", __func__);
|
|
//Write the primary header
|
|
if(gpt_set_header(disk->hdr, fd, PRIMARY_GPT) != 0) {
|
|
fprintf(stderr, "%s: Failed to update primary GPT header\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
printf("%s: Writing back primary partition array\n", __func__);
|
|
//Write back the primary partition array
|
|
if (gpt_set_pentry_arr(disk->hdr, fd, disk->pentry_arr)) {
|
|
fprintf(stderr, "%s: Failed to write primary GPT partition arr\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
fsync(fd);
|
|
close(fd);
|
|
return 0;
|
|
error:
|
|
if (fd >= 0)
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|