/**
* fdisk_get_partition:
* @cxt: context
* @partno: partition number (0 is the first partition)
* @pa: returns data about partition
*
* Reads disklabel and fills in @pa with data about partition @n.
*
* Note that partno may address unused partition and then this function does
* not fill anything to @pa. See fdisk_is_partition_used(). If @pa points to
* NULL then the function allocates a newly allocated fdisk_partition struct,
* use fdisk_unref_partition() to deallocate.
*
* Returns: 0 on success, otherwise, a corresponding error.
*/
int fdisk_get_partition(struct fdisk_context *cxt, size_t partno,
struct fdisk_partition **pa)
{
int rc;
struct fdisk_partition *np = NULL;
if (!cxt || !cxt->label || !pa)
return -EINVAL;
if (!cxt->label->op->get_part)
return -ENOSYS;
if (!fdisk_is_partition_used(cxt, partno))
return -EINVAL;
if (!*pa) {
np = *pa = fdisk_new_partition();
if (!*pa)
return -ENOMEM;
} else
fdisk_reset_partition(*pa);
(*pa)->partno = partno;
rc = cxt->label->op->get_part(cxt, partno, *pa);
if (rc) {
if (np) {
fdisk_unref_partition(np);
*pa = NULL;
} else
fdisk_reset_partition(*pa);
} else
(*pa)->size_explicit = 1;
return rc;
}
static struct fdisk_partition *__copy_partition(struct fdisk_partition *o)
{
struct fdisk_partition *n = fdisk_new_partition();
if (!n)
return NULL;
memcpy(n, o, sizeof(*n));
if (n->type)
fdisk_ref_parttype(n->type);
if (o->name)
n->name = strdup(o->name);
if (o->uuid)
n->uuid = strdup(o->uuid);
if (o->attrs)
n->attrs = strdup(o->attrs);
return n;
}
/**
* fdisk_set_partition_type:
* @cxt: fdisk context
* @partnum: partition number
* @t: new type
*
* Returns: 0 on success, < 0 on error.
*/
int fdisk_set_partition_type(struct fdisk_context *cxt,
size_t partnum,
struct fdisk_parttype *t)
{
if (!cxt || !cxt->label || !t)
return -EINVAL;
if (cxt->label->op->set_part) {
struct fdisk_partition *pa = fdisk_new_partition();
int rc;
if (!pa)
return -ENOMEM;
fdisk_partition_set_type(pa, t);
DBG(CXT, ul_debugobj(cxt, "partition: %zd: set type", partnum));
rc = cxt->label->op->set_part(cxt, partnum, pa);
fdisk_unref_partition(pa);
return rc;
}
return -ENOSYS;
}
