Function fdescfree_fds_adapt_use

freebsd/kern/kern_descrip.c:2522–2565

* Release a filedesc structure, we use this. */

 * Release a filedesc structure, we use this.
 */
static void
fdescfree_fds_adapt_use(struct thread *td, struct filedesc *fdp, bool needclose)
{
	struct filedesc0 *fdp0;
	struct freetable *ft, *tft;
	struct filedescent *fde;
	struct file *fp;
	int i, lastfile;

	KASSERT(refcount_load(&fdp->fd_refcnt) == 0,
	    ("%s: fd table %p carries references", __func__, fdp));

	/*
	 * Serialize with threads iterating over the table, if any.
	 */
	if (refcount_load(&fdp->fd_holdcnt) > 1) {
		FILEDESC_XLOCK(fdp);
		FILEDESC_XUNLOCK(fdp);
	}

	lastfile = fdlastfile_single(fdp);
	for (i = 0; i <= lastfile; i++) {
		fde = &fdp->fd_ofiles[i];
		fp = fde->fde_file;
		if (fp != NULL) {
			fdefree_last(fde);
			if (needclose)
				(void) closefp_impl(fdp, i, fp, td, true);
			else
				fdrop(fp, td);
		}
	}

	if (NDSLOTS(fdp->fd_nfiles) > NDSLOTS(NDFILE))
		free(fdp->fd_map, M_FILEDESC);
	if (fdp->fd_nfiles > NDFILE)
		free(fdp->fd_files, M_FILEDESC);

	fdp0 = (struct filedesc0 *)fdp;
	SLIST_FOREACH_SAFE(ft, &fdp0->fd_free, ft_next, tft)
		free(ft->ft_table, M_FILEDESC);

	fddrop(fdp);
}

void
fdescfree_adapt_use(struct thread *td)