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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/vm/swap_pager.h
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/*-

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 * SPDX-License-Identifier: BSD-3-Clause

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 *

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 * Copyright (c) 1990 University of Utah.

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 * Copyright (c) 1991 The Regents of the University of California.

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 * All rights reserved.

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 *

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 * This code is derived from software contributed to Berkeley by

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 * the Systems Programming Group of the University of Utah Computer

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 * Science Department.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 * 3. Neither the name of the University nor the names of its contributors

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 *    may be used to endorse or promote products derived from this software

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 *    without specific prior written permission.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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#ifndef	_VM_SWAP_PAGER_H_

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#define	_VM_SWAP_PAGER_H_

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#include <sys/_types.h>

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struct buf;

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struct swdevt;

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struct thread;

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typedef void sw_strategy_t(struct buf *, struct swdevt *);

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typedef void sw_close_t(struct thread *, struct swdevt *);

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/*

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 * Swap device table

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 */

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struct swdevt {

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	int	sw_flags;

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	int	sw_nblks;

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	int     sw_used;

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	dev_t	sw_dev;

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	struct vnode *sw_vp;

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	void	*sw_id;

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	__daddr_t sw_first;

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	__daddr_t sw_end;

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	struct blist *sw_blist;

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	TAILQ_ENTRY(swdevt)	sw_list;

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	sw_strategy_t		*sw_strategy;

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	sw_close_t		*sw_close;

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};

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#define	SW_UNMAPPED	0x01

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#define	SW_CLOSING	0x04

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#ifdef _KERNEL

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extern bool swap_pager_almost_full;

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extern int swap_pager_avail;

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extern int nsw_cluster_max;

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struct xswdev;

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int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len);

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void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);

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bool swap_pager_scan_all_shadowed(vm_object_t object);

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vm_pindex_t swap_pager_seek_data(vm_object_t object, vm_pindex_t pindex);

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vm_pindex_t swap_pager_seek_hole(vm_object_t object, vm_pindex_t pindex);

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void swap_pager_freespace(vm_object_t object, vm_pindex_t start,

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    vm_size_t size, vm_size_t *freed);

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void swap_pager_swap_init(void);

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int swap_pager_nswapdev(void);

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int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_pindex_t);

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void swap_pager_status(int *total, int *used);

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u_long swap_pager_swapped_pages(vm_object_t object);

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void swapoff_all(void);

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bool swap_pager_init_object(vm_object_t object, void *handle,

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    struct ucred *cred, vm_ooffset_t size, vm_ooffset_t offset);

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#endif				/* _KERNEL */

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#endif				/* _VM_SWAP_PAGER_H_ */

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