高通平台如何正确设置userdata分区的大小

以下是一个简单的高通8295芯片的分区代码，其中包含了一些物理分区的信息，用于控制设备的分区行为。这个代码使用了GPT分区表，其中包含了一些基本的分区，如boot、recovery、system、userdata等等。此外，代码中还包含了一些附加分区，如cache、persist、misc等等。请注意，这只是一个简单的示例，实际的分区代码可能会更复杂和详细。 ``` #define SECTOR_SIZE 512 #define PARTITION_TABLE_SIZE 34 * SECTOR_SIZE struct partition_entry { uint8_t partition_guid[16]; uint64_t starting_lba; uint64_t ending_lba; uint64_t attributes; uint16_t partition_name[36]; }; struct partition_table { uint64_t signature; uint32_t revision; uint32_t header_size; uint32_t crc32; uint32_t reserved; uint64_t current_lba; uint64_t backup_lba; uint64_t first_usable_lba; uint64_t last_usable_lba; uint8_t disk_guid[16]; uint64_t partition_entry_lba; uint32_t num_partition_entries; uint32_t sizeof_partition_entry; uint32_t partition_entry_array_crc32; struct partition_entry partition_entries[128]; }; int main() { struct partition_table gpt = {0}; gpt.signature = 0x5452415020494645ULL; gpt.revision = 0x00010000; gpt.header_size = 92; gpt.current_lba = 1; gpt.backup_lba = 65535; gpt.first_usable_lba = 34; gpt.last_usable_lba = 65502; memcpy(gpt.disk_guid, "\x8f\x00\x00\x00\x00\x00\x10\x00\x80\x00\x00\xaa\x00\x38\x9b\x71", 16); gpt.partition_entry_lba = 2; gpt.num_partition_entries = 128; gpt.sizeof_partition_entry = 128; // boot partition struct partition_entry boot = {0}; memcpy(boot.partition_guid, "\x40\x0c\x52\x6a\x8d\x4e\x4f\x5d\x84\x65\x5a\x3e\x3f\xbd\x6c\x3f", 16); boot.starting_lba = 34; boot.ending_lba = 1601; boot.attributes = 0; memcpy(boot.partition_name, L"boot", 8 * sizeof(wchar_t)); gpt.partition_entries[0] = boot; // recovery partition struct partition_entry recovery = {0}; memcpy(recovery.partition_guid, "\x9e\x6d\xc5\x8e\x3b\x3d\x4a\x4b\x9f\x6a\x92\x9d\x8b\xfa\x8a\x13", 16); recovery.starting_lba = 1602; recovery.ending_lba = 3137; recovery.attributes = 0; memcpy(recovery.partition_name, L"recovery", 16 * sizeof(wchar_t)); gpt.partition_entries[1] = recovery; // system partition struct partition_entry system = {0}; memcpy(system.partition_guid, "\x7a\x26\x8c\x2e\x5d\x91\x4c\x45\xa1\x4b\x7e\x69\xb6\x6f\x1f\x9f", 16); system.starting_lba = 3138; system.ending_lba = 44289; system.attributes = 0; memcpy(system.partition_name, L"system", 12 * sizeof(wchar_t)); gpt.partition_entries[2] = system; // userdata partition struct partition_entry userdata = {0}; memcpy(userdata.partition_guid, "\xc5\x9a\x34\xd2\x64\x4d\x4c\x4d\x80\x0b\x67\xc0\x5c\x1b\xf3\x96", 16); userdata.starting_lba = 44290; userdata.ending_lba = 65502; userdata.attributes = 0; memcpy(userdata.partition_name, L"userdata", 14 * sizeof(wchar_t)); gpt.partition_entries[3] = userdata; // cache partition struct partition_entry cache = {0}; memcpy(cache.partition_guid, "\xbf\x0a\x1b\x2e\xd2\x1d\x4c\x4f\xa6\xdb\x2a\xef\x43\x7c\xdf\x3b", 16); cache.starting_lba = 3138; cache.ending_lba = 3377; cache.attributes = 0; memcpy(cache.partition_name, L"cache", 10 * sizeof(wchar_t)); gpt.partition_entries[4] = cache; // persist partition struct partition_entry persist = {0}; memcpy(persist.partition_guid, "\x6d\x55\x8e\xea\x6f\x36\x4c\x4d\xbb\x1c\x95\x7d\x5c\x5b\x12\x45", 16); persist.starting_lba = 3378; persist.ending_lba = 3649; persist.attributes = 0; memcpy(persist.partition_name, L"persist", 12 * sizeof(wchar_t)); gpt.partition_entries[5] = persist; // misc partition struct partition_entry misc = {0}; memcpy(misc.partition_guid, "\x5d\x07\x7d\x41\x6c\x77\x4e\x4f\xa9\x5e\x9c\x7d\x5c\x5b\x12\x45", 16); misc.starting_lba = 3650; misc.ending_lba = 3777; misc.attributes = 0; memcpy(misc.partition_name, L"misc", 8 * sizeof(wchar_t)); gpt.partition_entries[6] = misc; // write partition table to disk FILE* fp = fopen("/dev/block/mmcblk0", "wb"); fwrite(&gpt, 1, PARTITION_TABLE_SIZE, fp); fclose(fp); return 0; } ```