MAX_BACK_FILES
for (i = 0; i < MAX_BACK_FILES; i++) {
while (i < argc && ctx.nr_files < MAX_BACK_FILES) {
unsigned long backing_file_size[MAX_BACK_FILES];
char backing_file[MAX_BACK_FILES][PATH_MAX];
int fds[MAX_BACK_FILES + 1]; /* fds[0] points to /dev/ublkcN */
char *files[MAX_BACK_FILES];
#define NR_STRIPE MAX_BACK_FILES