THMAP_INODE_LEN
p = gc_alloc(thmap, THMAP_INODE_LEN);
memset(node, 0, THMAP_INODE_LEN);
gc_free(thmap, nptr, THMAP_INODE_LEN);
stage_mem_gc(thmap, THMAP_GETOFF(thmap, node), THMAP_INODE_LEN);
stage_mem_gc(thmap, nptr, THMAP_INODE_LEN);