xfblob_create
error = xfblob_create("xattr names", &rx->xattr_blobs);
error = xfblob_create("xattr parent pointer names",
error = xfblob_create("slow directory entry names",
error = xfblob_create("directory entry names", &rd->dir_names);
error = xfblob_create("dirtree path names", &dl->path_names);
error = xfblob_create("slow parent pointer names", &pp->pptr_names);
error = xfblob_create("parent pointer names", &rp->pptr_names);
error = xfblob_create("parent pointer xattr values", &rp->xattr_blobs);
int xfblob_create(const char *descr, struct xfblob **blobp);