static int _dm_check_versions(void)
{
struct dm_task *dmt;
struct dm_versions *target, *last_target;
if (_dm_crypt_checked)
return 1;
if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
return 0;
if (!dm_task_run(dmt)) {
dm_task_destroy(dmt);
return 0;
}
target = dm_task_get_versions(dmt);
do {
last_target = target;
if (!strcmp(DM_CRYPT_TARGET, target->name)) {
_dm_set_crypt_compat((int)target->version[0],
(int)target->version[1],
(int)target->version[2]);
}
target = (void *) target + target->next;
} while (last_target != target);
dm_task_destroy(dmt);
return 1;
}
/*
* Retrieve list of registered mapping targets.
*
* dm-library must get inititalized by caller.
*/
static struct dm_versions *
get_target_list(void)
{
struct dm_task *dmt;
return (dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)) &&
dm_task_run(dmt) ? dm_task_get_versions(dmt) : NULL;
}
int
dm_drv_version (unsigned int * version, char * str)
{
int r = 2;
struct dm_task *dmt;
struct dm_versions *target;
struct dm_versions *last_target;
unsigned int *v;
version[0] = 0;
version[1] = 0;
version[2] = 0;
if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
return 1;
dm_task_no_open_count(dmt);
if (!dm_task_run(dmt)) {
condlog(0, "Can not communicate with kernel DM");
goto out;
}
target = dm_task_get_versions(dmt);
do {
last_target = target;
if (!strncmp(str, target->name, strlen(str))) {
r = 1;
break;
}
target = (void *) target + target->next;
} while (last_target != target);
if (r == 2) {
condlog(0, "DM %s kernel driver not loaded", str);
goto out;
}
v = target->version;
version[0] = v[0];
version[1] = v[1];
version[2] = v[2];
r = 0;
out:
dm_task_destroy(dmt);
return r;
}
int dm_prereq(char * str, int x, int y, int z)
{
int r = 1;
struct dm_task *dmt;
struct dm_versions *target;
struct dm_versions *last_target;
if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
return 1;
dm_task_no_open_count(dmt);
if (!dm_task_run(dmt))
goto out;
target = dm_task_get_versions(dmt);
/* Fetch targets and print 'em */
do {
last_target = target;
if (!strncmp(str, target->name, strlen(str)) &&
/* dummy prereq on multipath version */
target->version[0] >= x &&
target->version[1] >= y &&
target->version[2] >= z
)
r = 0;
target = (void *) target + target->next;
} while (last_target != target);
out:
dm_task_destroy(dmt);
return r;
}