linux/fs/netfs/read_pgpriv2.c

// SPDX-License-Identifier: GPL-2.0-only
/* Read with PG_private_2 [DEPRECATED].
 *
 * Copyright (C) 2024 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 */

#include <linux/export.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/task_io_accounting_ops.h>
#include "internal.h"

/*
 * [DEPRECATED] Mark page as requiring copy-to-cache using PG_private_2.  The
 * third mark in the folio queue is used to indicate that this folio needs
 * writing.
 */
void netfs_pgpriv2_mark_copy_to_cache(struct netfs_io_subrequest *subreq,
				      struct netfs_io_request *rreq,
				      struct folio_queue *folioq,
				      int slot)
{ … }

/*
 * [DEPRECATED] Cancel PG_private_2 on all marked folios in the event of an
 * unrecoverable error.
 */
static void netfs_pgpriv2_cancel(struct folio_queue *folioq)
{ … }

/*
 * [DEPRECATED] Copy a folio to the cache with PG_private_2 set.
 */
static int netfs_pgpriv2_copy_folio(struct netfs_io_request *wreq, struct folio *folio)
{ … }

/*
 * [DEPRECATED] Go through the buffer and write any folios that are marked with
 * the third mark to the cache.
 */
void netfs_pgpriv2_write_to_the_cache(struct netfs_io_request *rreq)
{ … }

/*
 * [DEPRECATED] Remove the PG_private_2 mark from any folios we've finished
 * copying.
 */
bool netfs_pgpriv2_unlock_copied_folios(struct netfs_io_request *wreq)
{ … }