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@@ -0,0 +1,1524 @@
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+/*
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+ * Copyright (c) 2013,2016,2020 The Linux Foundation. All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are
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+ * met:
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * * Redistributions in binary form must reproduce the above
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+ * copyright notice, this list of conditions and the following
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+ * disclaimer in the documentation and/or other materials provided
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+ * with the distribution.
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+ * * Neither the name of The Linux Foundation nor the names of its
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+ * contributors may be used to endorse or promote products derived
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+ * from this software without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#define _LARGEFILE64_SOURCE /* enable lseek64() */
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+
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+/******************************************************************************
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+ * INCLUDE SECTION
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+ ******************************************************************************/
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+#include <stdio.h>
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+#include <fcntl.h>
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+#include <string.h>
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+#include <errno.h>
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+#include <sys/stat.h>
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+#include <sys/ioctl.h>
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+#include <unistd.h>
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+#include <linux/fs.h>
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+#include <limits.h>
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+#include <dirent.h>
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+#include <linux/kernel.h>
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+#include <asm/byteorder.h>
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+#include <map>
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+#include <vector>
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+#include <string>
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+#ifndef __STDC_FORMAT_MACROS
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+#define __STDC_FORMAT_MACROS
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+#endif
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+#include <inttypes.h>
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+
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+
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+#define LOG_TAG "gpt-utils"
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+#include <cutils/log.h>
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+#include <cutils/properties.h>
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+#include "gpt-utils.h"
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+#include <zlib.h>
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+#include <endian.h>
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+
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+
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+/******************************************************************************
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+ * DEFINE SECTION
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+ ******************************************************************************/
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+#define BLK_DEV_FILE "/dev/block/mmcblk0"
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+/* list the names of the backed-up partitions to be swapped */
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+/* extension used for the backup partitions - tzbak, abootbak, etc. */
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+#define BAK_PTN_NAME_EXT "bak"
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+#define XBL_PRIMARY "/dev/block/bootdevice/by-name/xbl"
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+#define XBL_BACKUP "/dev/block/bootdevice/by-name/xblbak"
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+#define XBL_AB_PRIMARY "/dev/block/bootdevice/by-name/xbl_a"
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+#define XBL_AB_SECONDARY "/dev/block/bootdevice/by-name/xbl_b"
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+/* GPT defines */
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+#define MAX_LUNS 26
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+//This will allow us to get the root lun path from the path to the partition.
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+//i.e: from /dev/block/sdaXXX get /dev/block/sda. The assumption here is that
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+//the boot critical luns lie between sda to sdz which is acceptable because
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+//only user added external disks,etc would lie beyond that limit which do not
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+//contain partitions that interest us here.
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+#define PATH_TRUNCATE_LOC (sizeof("/dev/block/sda") - 1)
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+
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+//From /dev/block/sda get just sda
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+#define LUN_NAME_START_LOC (sizeof("/dev/block/") - 1)
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+#define BOOT_LUN_A_ID 1
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+#define BOOT_LUN_B_ID 2
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+/******************************************************************************
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+ * MACROS
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+ ******************************************************************************/
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+
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+
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+#define GET_4_BYTES(ptr) ((uint32_t) *((uint8_t *)(ptr)) | \
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+ ((uint32_t) *((uint8_t *)(ptr) + 1) << 8) | \
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+ ((uint32_t) *((uint8_t *)(ptr) + 2) << 16) | \
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+ ((uint32_t) *((uint8_t *)(ptr) + 3) << 24))
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+
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+#define GET_8_BYTES(ptr) ((uint64_t) *((uint8_t *)(ptr)) | \
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+ ((uint64_t) *((uint8_t *)(ptr) + 1) << 8) | \
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+ ((uint64_t) *((uint8_t *)(ptr) + 2) << 16) | \
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+ ((uint64_t) *((uint8_t *)(ptr) + 3) << 24) | \
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+ ((uint64_t) *((uint8_t *)(ptr) + 4) << 32) | \
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+ ((uint64_t) *((uint8_t *)(ptr) + 5) << 40) | \
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+ ((uint64_t) *((uint8_t *)(ptr) + 6) << 48) | \
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+ ((uint64_t) *((uint8_t *)(ptr) + 7) << 56))
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+
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+#define PUT_4_BYTES(ptr, y) *((uint8_t *)(ptr)) = (y) & 0xff; \
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+ *((uint8_t *)(ptr) + 1) = ((y) >> 8) & 0xff; \
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+ *((uint8_t *)(ptr) + 2) = ((y) >> 16) & 0xff; \
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+ *((uint8_t *)(ptr) + 3) = ((y) >> 24) & 0xff;
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+
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+/******************************************************************************
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+ * TYPES
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+ ******************************************************************************/
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+using namespace std;
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+enum gpt_state {
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+ GPT_OK = 0,
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+ GPT_BAD_SIGNATURE,
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+ GPT_BAD_CRC
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+};
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+//List of LUN's containing boot critical images.
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+//Required in the case of UFS devices
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+struct update_data {
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+ char lun_list[MAX_LUNS][PATH_MAX];
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+ uint32_t num_valid_entries;
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+};
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+
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+int32_t set_boot_lun(char *sg_dev,uint8_t boot_lun_id);
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+/******************************************************************************
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+ * FUNCTIONS
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+ ******************************************************************************/
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+/**
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+ * ==========================================================================
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+ *
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+ * \brief Read/Write len bytes from/to block dev
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+ *
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+ * \param [in] fd block dev file descriptor (returned from open)
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+ * \param [in] rw RW flag: 0 - read, != 0 - write
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+ * \param [in] offset block dev offset [bytes] - RW start position
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+ * \param [in] buf Pointer to the buffer containing the data
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+ * \param [in] len RW size in bytes. Buf must be at least that big
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+ *
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+ * \return 0 on success
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+ *
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+ * ==========================================================================
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+ */
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+static int blk_rw(int fd, int rw, int64_t offset, uint8_t *buf, unsigned len)
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+{
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+ int r;
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+
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+ if (lseek64(fd, offset, SEEK_SET) < 0) {
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+ fprintf(stderr, "block dev lseek64 %" PRIi64 " failed: %s\n", offset,
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+ strerror(errno));
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+ return -1;
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+ }
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+
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+ if (rw)
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+ r = write(fd, buf, len);
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+ else
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+ r = read(fd, buf, len);
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+
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+ if (r < 0)
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+ fprintf(stderr, "block dev %s failed: %s\n", rw ? "write" : "read",
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+ strerror(errno));
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+ else
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+ r = 0;
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+
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+ return r;
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+}
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+
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+
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+
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+/**
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+ * ==========================================================================
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+ *
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+ * \brief Search within GPT for partition entry with the given name
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+ * or it's backup twin (name-bak).
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+ *
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+ * \param [in] ptn_name Partition name to seek
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+ * \param [in] pentries_start Partition entries array start pointer
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+ * \param [in] pentries_end Partition entries array end pointer
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+ * \param [in] pentry_size Single partition entry size [bytes]
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+ *
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+ * \return First partition entry pointer that matches the name or NULL
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+ *
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+ * ==========================================================================
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+ */
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+static uint8_t *gpt_pentry_seek(const char *ptn_name,
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+ const uint8_t *pentries_start,
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+ const uint8_t *pentries_end,
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+ uint32_t pentry_size)
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+{
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+ char *pentry_name;
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+ unsigned len = strlen(ptn_name);
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+ unsigned i;
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+ char name8[MAX_GPT_NAME_SIZE] = {0}; // initialize with null
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+
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+ for (pentry_name = (char *) (pentries_start + PARTITION_NAME_OFFSET);
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+ pentry_name < (char *) pentries_end;
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+ pentry_name += pentry_size) {
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+
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+ /* Partition names in GPT are UTF-16 - ignoring UTF-16 2nd byte */
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+ for (i = 0; i < sizeof(name8) / 2; i++)
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+ name8[i] = pentry_name[i * 2];
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+ name8[i] = '\0';
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+
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+ if (!strncmp(ptn_name, name8, len)) {
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+ if (name8[len] == 0 || !strcmp(&name8[len], BAK_PTN_NAME_EXT))
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+ return (uint8_t *) (pentry_name - PARTITION_NAME_OFFSET);
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+ }
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+ }
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+
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+ return NULL;
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+}
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+
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+
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+
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+/**
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+ * ==========================================================================
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+ *
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+ * \brief Swaps boot chain in GPT partition entries array
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+ *
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+ * \param [in] pentries_start Partition entries array start
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+ * \param [in] pentries_end Partition entries array end
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+ * \param [in] pentry_size Single partition entry size
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+ *
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+ * \return 0 on success, 1 if no backup partitions found
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+ *
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+ * ==========================================================================
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+ */
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+static int gpt_boot_chain_swap(const uint8_t *pentries_start,
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+ const uint8_t *pentries_end,
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+ uint32_t pentry_size)
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+{
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+ const char ptn_swap_list[][MAX_GPT_NAME_SIZE] = { PTN_SWAP_LIST };
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+
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+ int backup_not_found = 1;
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+ unsigned i;
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+
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+ for (i = 0; i < ARRAY_SIZE(ptn_swap_list); i++) {
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+ uint8_t *ptn_entry;
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+ uint8_t *ptn_bak_entry;
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+ uint8_t ptn_swap[PTN_ENTRY_SIZE];
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+ //Skip the xbl, multiimgoem, multiimgqti partitions on UFS devices. That is handled
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+ //seperately.
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+ if (gpt_utils_is_ufs_device() && !strncmp(ptn_swap_list[i],PTN_XBL,strlen(PTN_XBL))
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+ || !strncmp(ptn_swap_list[i],PTN_MULTIIMGOEM,strlen(PTN_MULTIIMGOEM))
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+ || !strncmp(ptn_swap_list[i],PTN_MULTIIMGQTI,strlen(PTN_MULTIIMGQTI)))
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+ continue;
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+
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+ ptn_entry = gpt_pentry_seek(ptn_swap_list[i], pentries_start,
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+ pentries_end, pentry_size);
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+ if (ptn_entry == NULL)
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+ continue;
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+
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+ ptn_bak_entry = gpt_pentry_seek(ptn_swap_list[i],
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+ ptn_entry + pentry_size, pentries_end, pentry_size);
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+ if (ptn_bak_entry == NULL) {
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+ fprintf(stderr, "'%s' partition not backup - skip safe update\n",
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+ ptn_swap_list[i]);
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+ continue;
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+ }
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+
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+ /* swap primary <-> backup partition entries */
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+ memcpy(ptn_swap, ptn_entry, PTN_ENTRY_SIZE);
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+ memcpy(ptn_entry, ptn_bak_entry, PTN_ENTRY_SIZE);
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+ memcpy(ptn_bak_entry, ptn_swap, PTN_ENTRY_SIZE);
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+ backup_not_found = 0;
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+ }
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+
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+ return backup_not_found;
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+}
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+
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+
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+
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+/**
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+ * ==========================================================================
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+ *
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+ * \brief Sets secondary GPT boot chain
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+ *
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+ * \param [in] fd block dev file descriptor
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+ * \param [in] boot Boot chain to switch to
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+ *
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+ * \return 0 on success
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+ *
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+ * ==========================================================================
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+ */
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+static int gpt2_set_boot_chain(int fd, enum boot_chain boot)
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+{
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+ int64_t gpt2_header_offset;
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+ uint64_t pentries_start_offset;
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+ uint32_t gpt_header_size;
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+ uint32_t pentry_size;
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+ uint32_t pentries_array_size;
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+
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+ uint8_t *gpt_header = NULL;
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+ uint8_t *pentries = NULL;
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+ uint32_t crc;
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+ uint32_t crc_zero;
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+ uint32_t blk_size = 0;
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+ int r;
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+
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+
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+ crc_zero = crc32(0L, Z_NULL, 0);
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+ if (ioctl(fd, BLKSSZGET, &blk_size) != 0) {
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+ fprintf(stderr, "Failed to get GPT device block size: %s\n",
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+ strerror(errno));
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+ r = -1;
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+ goto EXIT;
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+ }
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+ gpt_header = (uint8_t*)malloc(blk_size);
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+ if (!gpt_header) {
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+ fprintf(stderr, "Failed to allocate memory to hold GPT block\n");
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+ r = -1;
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+ goto EXIT;
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+ }
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+ gpt2_header_offset = lseek64(fd, 0, SEEK_END) - blk_size;
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+ if (gpt2_header_offset < 0) {
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+ fprintf(stderr, "Getting secondary GPT header offset failed: %s\n",
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+ strerror(errno));
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+ r = -1;
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+ goto EXIT;
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+ }
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+
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+ /* Read primary GPT header from block dev */
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+ r = blk_rw(fd, 0, blk_size, gpt_header, blk_size);
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+
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+ if (r) {
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+ fprintf(stderr, "Failed to read primary GPT header from blk dev\n");
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+ goto EXIT;
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+ }
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+ pentries_start_offset =
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+ GET_8_BYTES(gpt_header + PENTRIES_OFFSET) * blk_size;
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+ pentry_size = GET_4_BYTES(gpt_header + PENTRY_SIZE_OFFSET);
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+ pentries_array_size =
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+ GET_4_BYTES(gpt_header + PARTITION_COUNT_OFFSET) * pentry_size;
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+
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+ pentries = (uint8_t *) calloc(1, pentries_array_size);
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+ if (pentries == NULL) {
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+ fprintf(stderr,
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+ "Failed to alloc memory for GPT partition entries array\n");
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+ r = -1;
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+ goto EXIT;
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+ }
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+ /* Read primary GPT partititon entries array from block dev */
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+ r = blk_rw(fd, 0, pentries_start_offset, pentries, pentries_array_size);
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+ if (r)
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+ goto EXIT;
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+
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+ crc = crc32(crc_zero, pentries, pentries_array_size);
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+ if (GET_4_BYTES(gpt_header + PARTITION_CRC_OFFSET) != crc) {
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+ fprintf(stderr, "Primary GPT partition entries array CRC invalid\n");
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+ r = -1;
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+ goto EXIT;
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+ }
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+
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+ /* Read secondary GPT header from block dev */
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+ r = blk_rw(fd, 0, gpt2_header_offset, gpt_header, blk_size);
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+ if (r)
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+ goto EXIT;
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+
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+ gpt_header_size = GET_4_BYTES(gpt_header + HEADER_SIZE_OFFSET);
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+ pentries_start_offset =
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+ GET_8_BYTES(gpt_header + PENTRIES_OFFSET) * blk_size;
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+
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+ if (boot == BACKUP_BOOT) {
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+ r = gpt_boot_chain_swap(pentries, pentries + pentries_array_size,
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+ pentry_size);
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+ if (r)
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+ goto EXIT;
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+ }
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+
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+ crc = crc32(crc_zero, pentries, pentries_array_size);
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+ PUT_4_BYTES(gpt_header + PARTITION_CRC_OFFSET, crc);
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+
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+ /* header CRC is calculated with this field cleared */
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|
|
+ PUT_4_BYTES(gpt_header + HEADER_CRC_OFFSET, 0);
|
|
|
+ crc = crc32(crc_zero, 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 crc_zero;
|
|
|
+ uint32_t blk_size = 0;
|
|
|
+
|
|
|
+ *state = GPT_OK;
|
|
|
+
|
|
|
+ crc_zero = crc32(0L, Z_NULL, 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, "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(crc_zero, 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 crc_zero;
|
|
|
+ uint32_t blk_size = 0;
|
|
|
+
|
|
|
+ crc_zero = crc32(0L, Z_NULL, 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 = crc32(crc_zero, 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/block/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", 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;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+//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/block/sdb) that corresponds
|
|
|
+// to the /dev/block/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;
|
|
|
+ }
|
|
|
+ /* set boot lun using /dev/sg or /dev/ufs-bsg* */
|
|
|
+ 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()
|
|
|
+{
|
|
|
+ char bootdevice[PROPERTY_VALUE_MAX] = {0};
|
|
|
+ property_get("ro.boot.bootdevice", bootdevice, "N/A");
|
|
|
+ if (strlen(bootdevice) < strlen(".ufshc") + 1)
|
|
|
+ return 0;
|
|
|
+ return (!strncmp(&bootdevice[strlen(bootdevice) - strlen(".ufshc")],
|
|
|
+ ".ufshc",
|
|
|
+ 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/block/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;
|
|
|
+ enum boot_update_stage internal_stage;
|
|
|
+ struct stat xbl_partition_stat;
|
|
|
+ struct stat ufs_dir_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",
|
|
|
+ __func__);
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ if (stat(lun_path, &st)) {
|
|
|
+ fprintf(stderr, "%s: Unable to access %s. Skipping adding to list",
|
|
|
+ __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 r, fd;
|
|
|
+ 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/block/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/block/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))
|
|
|
+ || !strncmp(ptn_swap_list[i],PTN_MULTIIMGOEM,strlen(PTN_MULTIIMGOEM))
|
|
|
+ || !strncmp(ptn_swap_list[i],PTN_MULTIIMGQTI,strlen(PTN_MULTIIMGQTI)))
|
|
|
+ continue;
|
|
|
+ snprintf(buf, sizeof(buf),
|
|
|
+ "%s/%sbak",
|
|
|
+ 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",
|
|
|
+ __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/block/mmcblk0). In the case of UFS we look
|
|
|
+//through the /dev/block/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;
|
|
|
+ char path[PATH_MAX] = {0};
|
|
|
+ if (!partname || !buf || buflen < ((PATH_TRUNCATE_LOC) + 1)) {
|
|
|
+ ALOGE("%s: Invalid argument", __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);
|
|
|
+ if (stat(path, &st)) {
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ if (readlink(path, buf, buflen) < 0)
|
|
|
+ {
|
|
|
+ goto error;
|
|
|
+ } else {
|
|
|
+ buf[PATH_TRUNCATE_LOC] = '\0';
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ snprintf(buf, buflen, BLK_DEV_FILE);
|
|
|
+ }
|
|
|
+ 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__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ //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;
|
|
|
+error:
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+//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) {
|
|
|
+ ALOGE("%s: invalid descriptor",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ if (ioctl(fd, BLKSSZGET, &block_size) != 0) {
|
|
|
+ ALOGE("%s: Failed to get GPT dev block size : %s",
|
|
|
+ __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;
|
|
|
+ off64_t gpt_header_offset = 0;
|
|
|
+ if (!gpt_header || fd < 0) {
|
|
|
+ ALOGE("%s: Invalid arguments",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ block_size = gpt_get_block_size(fd);
|
|
|
+ if (block_size == 0) {
|
|
|
+ ALOGE("%s: Failed to get block size", __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) {
|
|
|
+ ALOGE("%s: Failed to get gpt header offset",__func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ if (blk_rw(fd, 1, gpt_header_offset, gpt_header, block_size)) {
|
|
|
+ ALOGE("%s: Failed to write back GPT header", __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};
|
|
|
+ int64_t hdr_offset = 0;
|
|
|
+ uint32_t block_size = 0;
|
|
|
+ int fd = -1;
|
|
|
+ if (!partname) {
|
|
|
+ ALOGE("%s: Invalid partition name", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ if (get_dev_path_from_partition_name(partname, devpath, sizeof(devpath))
|
|
|
+ != 0) {
|
|
|
+ ALOGE("%s: Failed to resolve path for %s",
|
|
|
+ __func__,
|
|
|
+ partname);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ fd = open(devpath, O_RDWR);
|
|
|
+ if (fd < 0) {
|
|
|
+ ALOGE("%s: Failed to open %s : %s",
|
|
|
+ __func__,
|
|
|
+ devpath,
|
|
|
+ strerror(errno));
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ block_size = gpt_get_block_size(fd);
|
|
|
+ if (block_size == 0)
|
|
|
+ {
|
|
|
+ ALOGE("%s: Failed to get gpt block size for %s",
|
|
|
+ __func__,
|
|
|
+ partname);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ hdr = (uint8_t*)malloc(block_size);
|
|
|
+ if (!hdr) {
|
|
|
+ ALOGE("%s: Failed to allocate memory for gpt header",
|
|
|
+ __func__);
|
|
|
+ }
|
|
|
+ if (instance == PRIMARY_GPT)
|
|
|
+ hdr_offset = block_size;
|
|
|
+ else {
|
|
|
+ hdr_offset = lseek64(fd, 0, SEEK_END) - block_size;
|
|
|
+ }
|
|
|
+ if (hdr_offset < 0) {
|
|
|
+ ALOGE("%s: Failed to get gpt header offset",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ if (blk_rw(fd, 0, hdr_offset, hdr, block_size)) {
|
|
|
+ ALOGE("%s: Failed to read GPT header from device",
|
|
|
+ __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) {
|
|
|
+ ALOGE("%s: Invalid header", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ if (fd < 0) {
|
|
|
+ ALOGE("%s: Invalid fd", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ block_size = gpt_get_block_size(fd);
|
|
|
+ if (!block_size) {
|
|
|
+ ALOGE("%s: Failed to get gpt block size for",
|
|
|
+ __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) {
|
|
|
+ ALOGE("%s: Failed to allocate memory for partition array",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ rc = blk_rw(fd, 0,
|
|
|
+ pentries_start,
|
|
|
+ pentry_arr,
|
|
|
+ pentries_arr_size);
|
|
|
+ if (rc) {
|
|
|
+ ALOGE("%s: Failed to read partition entry array",
|
|
|
+ __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) {
|
|
|
+ ALOGE("%s: Invalid argument", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ block_size = gpt_get_block_size(fd);
|
|
|
+ if (!block_size) {
|
|
|
+ ALOGE("%s: Failed to get gpt block size for",
|
|
|
+ __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;
|
|
|
+ rc = blk_rw(fd, 1,
|
|
|
+ pentries_start,
|
|
|
+ arr,
|
|
|
+ pentries_arr_size);
|
|
|
+ if (rc) {
|
|
|
+ ALOGE("%s: Failed to read partition entry array",
|
|
|
+ __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) {
|
|
|
+ ALOGE("%s: Failed to allocate memory", __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;
|
|
|
+ uint32_t crc_zero;
|
|
|
+
|
|
|
+ crc_zero = crc32(0L, Z_NULL, 0);
|
|
|
+ if (!dsk || !dev) {
|
|
|
+ ALOGE("%s: Invalid arguments", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ disk = dsk;
|
|
|
+ disk->hdr = gpt_get_header(dev, PRIMARY_GPT);
|
|
|
+ if (!disk->hdr) {
|
|
|
+ ALOGE("%s: Failed to get primary header", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ gpt_header_size = GET_4_BYTES(disk->hdr + HEADER_SIZE_OFFSET);
|
|
|
+ disk->hdr_crc = crc32(crc_zero, disk->hdr, gpt_header_size);
|
|
|
+ disk->hdr_bak = gpt_get_header(dev, SECONDARY_GPT);
|
|
|
+ if (!disk->hdr_bak) {
|
|
|
+ ALOGE("%s: Failed to get backup header", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ disk->hdr_bak_crc = crc32(crc_zero, 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) {
|
|
|
+ ALOGE("%s: Failed to resolve path for %s",
|
|
|
+ __func__,
|
|
|
+ dev);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ fd = open(disk->devpath, O_RDWR);
|
|
|
+ if (fd < 0) {
|
|
|
+ ALOGE("%s: Failed to open %s: %s",
|
|
|
+ __func__,
|
|
|
+ disk->devpath,
|
|
|
+ strerror(errno));
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ disk->pentry_arr = gpt_get_pentry_arr(disk->hdr, fd);
|
|
|
+ if (!disk->pentry_arr) {
|
|
|
+ ALOGE("%s: Failed to obtain partition entry array",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ disk->pentry_arr_bak = gpt_get_pentry_arr(disk->hdr_bak, fd);
|
|
|
+ if (!disk->pentry_arr_bak) {
|
|
|
+ ALOGE("%s: Failed to obtain backup partition entry array",
|
|
|
+ __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) {
|
|
|
+ ALOGE("%s: Invalid argument",__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;
|
|
|
+ uint32_t crc_zero;
|
|
|
+ crc_zero = crc32(0L, Z_NULL, 0);
|
|
|
+ if (!disk || (disk->is_initialized != GPT_DISK_INIT_MAGIC)) {
|
|
|
+ ALOGE("%s: invalid argument", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ //Recalculate the CRC of the primary partiton array
|
|
|
+ disk->pentry_arr_crc = crc32(crc_zero,
|
|
|
+ disk->pentry_arr,
|
|
|
+ disk->pentry_arr_size);
|
|
|
+ //Recalculate the CRC of the backup partition array
|
|
|
+ disk->pentry_arr_bak_crc = crc32(crc_zero,
|
|
|
+ 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 = crc32(crc_zero, disk->hdr, gpt_header_size);
|
|
|
+ disk->hdr_bak_crc = crc32(crc_zero, 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)){
|
|
|
+ ALOGE("%s: Invalid args", __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ fd = open(disk->devpath, O_RDWR | O_DSYNC);
|
|
|
+ if (fd < 0) {
|
|
|
+ ALOGE("%s: Failed to open %s: %s",
|
|
|
+ __func__,
|
|
|
+ disk->devpath,
|
|
|
+ strerror(errno));
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ //Write the primary header
|
|
|
+ if(gpt_set_header(disk->hdr, fd, PRIMARY_GPT) != 0) {
|
|
|
+ ALOGE("%s: Failed to update primary GPT header",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ //Write back the primary partition array
|
|
|
+ if (gpt_set_pentry_arr(disk->hdr, fd, disk->pentry_arr)) {
|
|
|
+ ALOGE("%s: Failed to write primary GPT partition arr",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ //Write back the secondary header
|
|
|
+ if(gpt_set_header(disk->hdr_bak, fd, SECONDARY_GPT) != 0) {
|
|
|
+ ALOGE("%s: Failed to update secondary GPT header",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ //Write back the secondary partition array
|
|
|
+ if (gpt_set_pentry_arr(disk->hdr_bak, fd, disk->pentry_arr_bak)) {
|
|
|
+ ALOGE("%s: Failed to write secondary GPT partition arr",
|
|
|
+ __func__);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ fsync(fd);
|
|
|
+ close(fd);
|
|
|
+ return 0;
|
|
|
+error:
|
|
|
+ if (fd >= 0)
|
|
|
+ close(fd);
|
|
|
+ return -1;
|
|
|
+}
|
Arian