linux_folio.c

/*-
 * Copyright (c) 2024-2025 The FreeBSD Foundation
 * Copyright (c) 2024-2025 Jean-Sébastien Pédron
 *
 * This software was developed by Jean-Sébastien Pédron under sponsorship
 * from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/mm_types.h>
#include <linux/page.h>
#include <linux/pagevec.h>

struct folio *
folio_alloc(gfp_t gfp, unsigned int order)
{
	struct page *page;
	struct folio *folio;

	/*
	 * Allocated pages are wired already. There is no need to increase a
	 * refcount here.
	 */
	page = alloc_pages(gfp | __GFP_COMP, order);
	folio = (struct folio *)page;

	return (folio);
}

void
__folio_batch_release(struct folio_batch *fbatch)
{
	release_pages(fbatch->folios, folio_batch_count(fbatch));

	folio_batch_reinit(fbatch);
}