linux/fs/netfs/direct_read.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* Direct I/O support.
 *
 * Copyright (C) 2023 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/uio.h>
#include <linux/sched/mm.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/netfs.h>
#include "internal.h"

/**
 * netfs_unbuffered_read_iter_locked - Perform an unbuffered or direct I/O read
 * @iocb: The I/O control descriptor describing the read
 * @iter: The output buffer (also specifies read length)
 *
 * Perform an unbuffered I/O or direct I/O from the file in @iocb to the
 * output buffer.  No use is made of the pagecache.
 *
 * The caller must hold any appropriate locks.
 */
ssize_t netfs_unbuffered_read_iter_locked(struct kiocb *iocb, struct iov_iter *iter)
{ … }
EXPORT_SYMBOL(…);

/**
 * netfs_unbuffered_read_iter - Perform an unbuffered or direct I/O read
 * @iocb: The I/O control descriptor describing the read
 * @iter: The output buffer (also specifies read length)
 *
 * Perform an unbuffered I/O or direct I/O from the file in @iocb to the
 * output buffer.  No use is made of the pagecache.
 */
ssize_t netfs_unbuffered_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{ … }
EXPORT_SYMBOL(…);