Merge "Change BCB to perform synchronous writes." am: 5797bf9c90 (59f28151) · Commits · e / tools / etwrp

bootloader.cpp

+74 −59

Original line number	Diff line number	Diff line
		@@ -14,26 +14,31 @@
		* limitations under the License.
		*/

		#include <fs_mgr.h>
		#include "bootloader.h"
		#include "common.h"
		#include "mtdutils/mtdutils.h"
		#include "roots.h"

		#include <errno.h>
		#include <fcntl.h>
		#include <inttypes.h>
		#include <stdio.h>
		#include <string.h>
		#include <sys/stat.h>
		#include <sys/types.h>
		#include <unistd.h>

		static int get_bootloader_message_mtd(struct bootloader_message out, const Volume v);
		static int set_bootloader_message_mtd(const struct bootloader_message in, const Volume v);
		static int get_bootloader_message_block(struct bootloader_message out, const Volume v);
		static int set_bootloader_message_block(const struct bootloader_message in, const Volume v);
		#include <fs_mgr.h>

		#include "bootloader.h"
		#include "common.h"
		#include "mtdutils/mtdutils.h"
		#include "roots.h"
		#include "unique_fd.h"

		static int get_bootloader_message_mtd(bootloader_message* out, const Volume* v);
		static int set_bootloader_message_mtd(const bootloader_message* in, const Volume* v);
		static int get_bootloader_message_block(bootloader_message* out, const Volume* v);
		static int set_bootloader_message_block(const bootloader_message* in, const Volume* v);

		int get_bootloader_message(struct bootloader_message *out) {
		int get_bootloader_message(bootloader_message* out) {
		Volume* v = volume_for_path("/misc");
		if (v == NULL) {
		if (v == nullptr) {
		LOGE("Cannot load volume /misc!\n");
		return -1;
		}
		@@ -46,9 +51,9 @@ int get_bootloader_message(struct bootloader_message *out) {
		return -1;
		}

		int set_bootloader_message(const struct bootloader_message *in) {
		int set_bootloader_message(const bootloader_message* in) {
		Volume* v = volume_for_path("/misc");
		if (v == NULL) {
		if (v == nullptr) {
		LOGE("Cannot load volume /misc!\n");
		return -1;
		}
		@@ -68,69 +73,69 @@ int set_bootloader_message(const struct bootloader_message *in) {
		static const int MISC_PAGES = 3; // number of pages to save
		static const int MISC_COMMAND_PAGE = 1; // bootloader command is this page

		static int get_bootloader_message_mtd(struct bootloader_message *out,
		static int get_bootloader_message_mtd(bootloader_message* out,
		const Volume* v) {
		size_t write_size;
		mtd_scan_partitions();
		const MtdPartition* part = mtd_find_partition_by_name(v->blk_device);
		if (part == NULL \|\| mtd_partition_info(part, NULL, NULL, &write_size)) {
		LOGE("Can't find %s\n", v->blk_device);
		if (part == nullptr \|\| mtd_partition_info(part, nullptr, nullptr, &write_size)) {
		LOGE("failed to find \"%s\"\n", v->blk_device);
		return -1;
		}

		MtdReadContext* read = mtd_read_partition(part);
		if (read == NULL) {
		LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
		if (read == nullptr) {
		LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}

		const ssize_t size = write_size * MISC_PAGES;
		char data[size];
		ssize_t r = mtd_read_data(read, data, size);
		if (r != size) LOGE("Can't read %s\n(%s)\n", v->blk_device, strerror(errno));
		if (r != size) LOGE("failed to read \"%s\": %s\n", v->blk_device, strerror(errno));
		mtd_read_close(read);
		if (r != size) return -1;

		memcpy(out, &data[write_size * MISC_COMMAND_PAGE], sizeof(*out));
		return 0;
		}
		static int set_bootloader_message_mtd(const struct bootloader_message *in,
		static int set_bootloader_message_mtd(const bootloader_message* in,
		const Volume* v) {
		size_t write_size;
		mtd_scan_partitions();
		const MtdPartition* part = mtd_find_partition_by_name(v->blk_device);
		if (part == NULL \|\| mtd_partition_info(part, NULL, NULL, &write_size)) {
		LOGE("Can't find %s\n", v->blk_device);
		if (part == nullptr \|\| mtd_partition_info(part, nullptr, nullptr, &write_size)) {
		LOGE("failed to find \"%s\"\n", v->blk_device);
		return -1;
		}

		MtdReadContext* read = mtd_read_partition(part);
		if (read == NULL) {
		LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
		if (read == nullptr) {
		LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}

		ssize_t size = write_size * MISC_PAGES;
		char data[size];
		ssize_t r = mtd_read_data(read, data, size);
		if (r != size) LOGE("Can't read %s\n(%s)\n", v->blk_device, strerror(errno));
		if (r != size) LOGE("failed to read \"%s\": %s\n", v->blk_device, strerror(errno));
		mtd_read_close(read);
		if (r != size) return -1;

		memcpy(&data[write_size * MISC_COMMAND_PAGE], in, sizeof(*in));

		MtdWriteContext* write = mtd_write_partition(part);
		if (write == NULL) {
		LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
		if (write == nullptr) {
		LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}
		if (mtd_write_data(write, data, size) != size) {
		LOGE("Can't write %s\n(%s)\n", v->blk_device, strerror(errno));
		LOGE("failed to write \"%s\": %s\n", v->blk_device, strerror(errno));
		mtd_write_close(write);
		return -1;
		}
		if (mtd_write_close(write)) {
		LOGE("Can't finish %s\n(%s)\n", v->blk_device, strerror(errno));
		LOGE("failed to finish \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}

		@@ -146,57 +151,67 @@ static int set_bootloader_message_mtd(const struct bootloader_message *in,
		static void wait_for_device(const char* fn) {
		int tries = 0;
		int ret;
		struct stat buf;
		do {
		++tries;
		struct stat buf;
		ret = stat(fn, &buf);
		if (ret) {
		printf("stat %s try %d: %s\n", fn, tries, strerror(errno));
		if (ret == -1) {
		printf("failed to stat \"%s\" try %d: %s\n", fn, tries, strerror(errno));
		sleep(1);
		}
		} while (ret && tries < 10);

		if (ret) {
		printf("failed to stat %s\n", fn);
		printf("failed to stat \"%s\"\n", fn);
		}
		}

		static int get_bootloader_message_block(struct bootloader_message *out,
		static int get_bootloader_message_block(bootloader_message* out,
		const Volume* v) {
		wait_for_device(v->blk_device);
		FILE* f = fopen(v->blk_device, "rb");
		if (f == NULL) {
		LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
		if (f == nullptr) {
		LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}
		struct bootloader_message temp;
		bootloader_message temp;
		int count = fread(&temp, sizeof(temp), 1, f);
		if (count != 1) {
		LOGE("Failed reading %s\n(%s)\n", v->blk_device, strerror(errno));
		LOGE("failed to read \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}
		if (fclose(f) != 0) {
		LOGE("Failed closing %s\n(%s)\n", v->blk_device, strerror(errno));
		LOGE("failed to close \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}
		memcpy(out, &temp, sizeof(temp));
		return 0;
		}

		static int set_bootloader_message_block(const struct bootloader_message *in,
		static int set_bootloader_message_block(const bootloader_message* in,
		const Volume* v) {
		wait_for_device(v->blk_device);
		FILE* f = fopen(v->blk_device, "wb");
		if (f == NULL) {
		LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
		unique_fd fd(open(v->blk_device, O_WRONLY \| O_SYNC));
		if (fd.get() == -1) {
		LOGE("failed to open \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}
		int count = fwrite(in, sizeof(*in), 1, f);
		if (count != 1) {
		LOGE("Failed writing %s\n(%s)\n", v->blk_device, strerror(errno));

		size_t written = 0;
		const uint8_t* start = reinterpret_cast<const uint8_t*>(in);
		size_t total = sizeof(*in);
		while (written < total) {
		ssize_t wrote = TEMP_FAILURE_RETRY(write(fd.get(), start + written, total - written));
		if (wrote == -1) {
		LOGE("failed to write %" PRId64 " bytes: %s\n",
		static_cast<off64_t>(written), strerror(errno));
		return -1;
		}
		if (fclose(f) != 0) {
		LOGE("Failed closing %s\n(%s)\n", v->blk_device, strerror(errno));
		written += wrote;
		}

		if (fsync(fd.get()) == -1) {
		LOGE("failed to fsync \"%s\": %s\n", v->blk_device, strerror(errno));
		return -1;
		}
		return 0;