static int get_image_info(const char *device, char **send_from_p,
char **format_p, int *blocksize)
{
int top_level;
if (ploop_get_attr(device, "top", &top_level)) {
ploop_err(0, "Can't find top delta");
return SYSEXIT_SYSFS;
}
if (ploop_get_attr(device, "block_size", blocksize)) {
ploop_err(0, "Can't find block size");
return SYSEXIT_SYSFS;
}
if (find_delta_names(device, top_level, top_level,
send_from_p, format_p)) {
ploop_err(errno, "find_delta_names");
return SYSEXIT_SYSFS;
}
return 0;
}
static int open_top_delta(const char *device, struct delta *delta, int *lvl)
{
char *image = NULL;
char *fmt = NULL;
if (ploop_get_attr(device, "top", lvl)) {
ploop_err(0, "Can't find top delta");
return(SYSEXIT_SYSFS);
}
if (find_delta_names(device, *lvl, *lvl, &image, &fmt))
return(SYSEXIT_SYSFS);
if (strcmp(fmt, "raw") == 0) {
ploop_err(0, "Ballooning for raw format is not supported");
return(SYSEXIT_PARAM);
}
if (open_delta(delta, image, O_RDONLY|O_DIRECT, OD_ALLOW_DIRTY)) {
ploop_err(errno, "open_delta");
return(SYSEXIT_OPEN);
}
return 0;
}
