freebsd-nq/sys/vm/swap_pager.h
Warner Losh cdccd11b36 forward declare struct thread
sys/sysctl.h moved struct thread forward declaration under #ifdef
_KERNEL and so this header fails when included from userland. Add a
forward declaration here.

Fixes:	     		99eefc727e
Sponsored by:		Netflix
2021-10-11 12:59:39 -06:00

91 lines
3.1 KiB
C

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1990 University of Utah.
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
* $FreeBSD$
*/
#ifndef _VM_SWAP_PAGER_H_
#define _VM_SWAP_PAGER_H_
#include <sys/_types.h>
struct buf;
struct swdevt;
struct thread;
typedef void sw_strategy_t(struct buf *, struct swdevt *);
typedef void sw_close_t(struct thread *, struct swdevt *);
/*
* Swap device table
*/
struct swdevt {
int sw_flags;
int sw_nblks;
int sw_used;
dev_t sw_dev;
struct vnode *sw_vp;
void *sw_id;
__daddr_t sw_first;
__daddr_t sw_end;
struct blist *sw_blist;
TAILQ_ENTRY(swdevt) sw_list;
sw_strategy_t *sw_strategy;
sw_close_t *sw_close;
};
#define SW_UNMAPPED 0x01
#define SW_CLOSING 0x04
#ifdef _KERNEL
extern int swap_pager_avail;
extern int nsw_cluster_max;
struct xswdev;
int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len);
void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);
vm_pindex_t swap_pager_find_least(vm_object_t object, vm_pindex_t pindex);
void swap_pager_swap_init(void);
int swap_pager_nswapdev(void);
int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_pindex_t);
void swap_pager_status(int *total, int *used);
u_long swap_pager_swapped_pages(vm_object_t object);
void swapoff_all(void);
bool swap_pager_init_object(vm_object_t object, void *handle,
struct ucred *cred, vm_ooffset_t size, vm_ooffset_t offset);
#endif /* _KERNEL */
#endif /* _VM_SWAP_PAGER_H_ */