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/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
* $FreeBSD$
*/
/*
* Modifications to the block allocation data structure by John S. Dyson
* 18 Dec 93.
*/
#ifndef _VM_SWAP_PAGER_H_
#define _VM_SWAP_PAGER_H_ 1
/*
* Swap device table
*/
struct swdevt {
udev_t sw_dev; /* For quasibogus swapdev reporting */
int sw_flags;
int sw_nblks;
int sw_used;
struct vnode *sw_vp;
dev_t sw_device;
};
#define SW_FREED 0x01
#define SW_SEQUENTIAL 0x02
#define SW_CLOSING 0x04
#define sw_freed sw_flags /* XXX compat */
#ifdef _KERNEL
/*
* SWB_NPAGES must be a power of 2. It may be set to 1, 2, 4, 8, or 16
* pages per allocation. We recommend you stick with the default of 8.
* The 16-page limit is due to the radix code (kern/subr_blist.c).
*/
#if !defined(SWB_NPAGES)
#define SWB_NPAGES 8
#endif
/*
* Piecemeal swap metadata structure. Swap is stored in a radix tree.
*
* If SWB_NPAGES is 8 and sizeof(char *) == sizeof(daddr_t), our radix
* is basically 8. Assuming PAGE_SIZE == 4096, one tree level represents
* 32K worth of data, two levels represent 256K, three levels represent
* 2 MBytes. This is acceptable.
*
* Overall memory utilization is about the same as the old swap structure.
*/
#define SWCORRECT(n) (sizeof(void *) * (n) / sizeof(daddr_t))
#define SWAP_META_PAGES (SWB_NPAGES * 2)
#define SWAP_META_MASK (SWAP_META_PAGES - 1)
struct swblock {
struct swblock *swb_hnext;
vm_object_t swb_object;
vm_pindex_t swb_index;
int swb_count;
daddr_t swb_pages[SWAP_META_PAGES];
};
extern struct pagerlst swap_pager_un_object_list;
extern int swap_pager_full;
extern struct blist *swapblist;
extern struct uma_zone *swap_zone;
extern int nswap_lowat, nswap_hiwat;
extern int dmmax, dmmax_mask;
extern struct vnode *swapdev_vp;
extern struct swdevt *swdevt;
extern int nswdev;
/*
* vm_swap_size is in page-sized chunks now. It was DEV_BSIZE'd chunks
* in the old system.
*/
extern int vm_swap_size; /* number of free swap blocks, in pages */
void swap_pager_putpages(vm_object_t, vm_page_t *, int, boolean_t, int *);
boolean_t swap_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *before, int *after);
void swap_pager_swapoff(int devidx, int *sw_used);
int swap_pager_swp_alloc(vm_object_t, int);
void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);
void swap_pager_freespace(vm_object_t, vm_pindex_t, vm_size_t);
void swap_pager_dmzspace(vm_object_t, vm_pindex_t, vm_size_t);
void swap_pager_swap_init(void);
int swap_pager_isswapped(vm_object_t, int);
int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_size_t);
/*
* newswap functions
*/
void swap_pager_page_removed(vm_page_t, vm_object_t);
#endif /* _KERNEL */
#endif /* _VM_SWAP_PAGER_H_ */
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