static int init_child(struct dm_btree_info *info, struct dm_btree_value_type *vt,
struct btree_node *parent,
unsigned index, struct child *result)
{
int r, inc;
dm_block_t root;
result->index = index;
root = value64(parent, index);
r = dm_tm_shadow_block(info->tm, root, &btree_node_validator,
&result->block, &inc);
if (r)
return r;
result->n = dm_block_data(result->block);
if (inc)
inc_children(info->tm, result->n, vt);
*((__le64 *) value_ptr(parent, index)) =
cpu_to_le64(dm_block_location(result->block));
return 0;
}
static int bn_shadow(struct dm_btree_info *info, dm_block_t orig,
struct dm_btree_value_type *vt,
struct dm_block **result)
{
int r, inc;
r = dm_tm_shadow_block(info->tm, orig, &btree_node_validator,
result, &inc);
if (!r && inc)
inc_children(info->tm, dm_block_data(*result), vt);
return r;
}