nfsd_file_file
status = nfs_local_run_commit(nfs_to->nfsd_file_file(ctx->localio),
struct file *file = nfs_to->nfsd_file_file(localio);
struct file *nfsd_file_file(struct nfsd_file *nf);
.nfsd_file_file = nfsd_file_file,
struct file *(*nfsd_file_file)(struct nfsd_file *);