+ sd->pfds = malloc(sizeof(struct pollfd) * td->nr_files);
+ memset(sd->pfds, 0, sizeof(struct pollfd) * td->nr_files);
+ sd->fd_flags = malloc(sizeof(int) * td->nr_files);
+ memset(sd->fd_flags, 0, sizeof(int) * td->nr_files);
+ sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->iodepth);
+ memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->iodepth);
+