ocfs2_reserve_clusters
ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
ret = ocfs2_reserve_clusters(osb, alloc + dx_alloc, &data_ac);
status = ocfs2_reserve_clusters(osb, 1, &data_ac);
ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
ret = ocfs2_reserve_clusters(osb, *len, &context->data_ac);
status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
int ocfs2_reserve_clusters(struct ocfs2_super *osb,
ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
ret = ocfs2_reserve_clusters(osb, len, data_ac);