/* Get kernel driver protocol version and comapre it with library version. */
static int _check_version(char *version, size_t size)
{
struct dm_task *task;
int r;
if (!(task = dm_task_create(DM_DEVICE_VERSION))) {
log_error("Failed to get device-mapper version");
version[0] = '\0';
return 0;
}
r = dm_task_run(task);
dm_task_get_driver_version(task, version, size);
dm_task_destroy(task);
return r;
}
/* Retrieve device-mapper driver version. */
int
dm_version(struct lib_context *lc, char *version, size_t size)
{
int ret;
struct dm_task *dmt;
/* Be prepared for device-mapper not in kernel. */
strncpy(version, "unknown", size);
_init_dm();
ret = (dmt = dm_task_create(DM_DEVICE_VERSION)) &&
dm_task_run(dmt) &&
dm_task_get_driver_version(dmt, version, size);
_exit_dm(dmt);
return ret;
}
void dm_check_version(void)
{
char *saveptr, *version;
struct dm_task *task = dm_task_create(DM_DEVICE_VERSION);
if(!task) {
die("dm_task_create");
}
dm_task_run(task);
version = steg_malloc(1024);
dm_task_get_driver_version(task, version, 1024);
version[1023] = 0;
strtok_r(version, ".", &saveptr);
if(strncmp(version, MESG_STR("4"))) {
die("unknown device mapper version");
}
steg_free(version);
dm_task_destroy(task);
}