am e8d953aa: recovery: more cargo-cult programming

        {

            size_t start = 0;

            int success = 0;

            int fd = open(partition, O_RDWR);

            int fd = open(partition, O_RDWR | O_DIRECT | O_SYNC);

            if (fd < 0) {

                printf("failed to open %s: %s\n", partition, strerror(errno));

                return -1;

            for (attempt = 0; attempt < 10; ++attempt) {

                size_t next_sync = start + (1<<20);

                printf("raw write %s attempt %d start at %d\n", partition, attempt+1, start);

                printf("raw O_DIRECT write %s attempt %d start at %d\n", partition, attempt+1, start);

                lseek(fd, start, SEEK_SET);

                while (start < len) {

                    size_t to_write = len - start;