linux/mm/fadvise.c

// SPDX-License-Identifier: GPL-2.0
/*
 * mm/fadvise.c
 *
 * Copyright (C) 2002, Linus Torvalds
 *
 * 11Jan2003	Andrew Morton
 *		Initial version.
 */

#include <linux/kernel.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/backing-dev.h>
#include <linux/fadvise.h>
#include <linux/writeback.h>
#include <linux/syscalls.h>
#include <linux/swap.h>

#include <asm/unistd.h>

#include "internal.h"

/*
 * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
 * deactivate the pages and clear PG_Referenced.
 */

int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
{ … }
EXPORT_SYMBOL(…);

int vfs_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
{ … }
EXPORT_SYMBOL(…);

#ifdef CONFIG_ADVISE_SYSCALLS

int ksys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
{ … }

SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
{ … }

#ifdef __ARCH_WANT_SYS_FADVISE64

SYSCALL_DEFINE4(fadvise64, int, fd, loff_t, offset, size_t, len, int, advice)
{ … }

#endif

#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_FADVISE64_64)

COMPAT_SYSCALL_DEFINE6(fadvise64_64, int, fd, compat_arg_u64_dual(offset),
		       compat_arg_u64_dual(len), int, advice)
{
	return ksys_fadvise64_64(fd, compat_arg_u64_glue(offset),
				 compat_arg_u64_glue(len), advice);
}

#endif
#endif