1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990 University of Utah. 5 * Copyright (c) 1991 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90 37 * $FreeBSD$ 38 */ 39 40 #ifndef _VM_SWAP_PAGER_H_ 41 #define _VM_SWAP_PAGER_H_ 42 43 #include <sys/_types.h> 44 45 struct buf; 46 struct swdevt; 47 struct thread; 48 typedef void sw_strategy_t(struct buf *, struct swdevt *); 49 typedef void sw_close_t(struct thread *, struct swdevt *); 50 51 /* 52 * Swap device table 53 */ 54 struct swdevt { 55 int sw_flags; 56 int sw_nblks; 57 int sw_used; 58 dev_t sw_dev; 59 struct vnode *sw_vp; 60 void *sw_id; 61 __daddr_t sw_first; 62 __daddr_t sw_end; 63 struct blist *sw_blist; 64 TAILQ_ENTRY(swdevt) sw_list; 65 sw_strategy_t *sw_strategy; 66 sw_close_t *sw_close; 67 }; 68 69 #define SW_UNMAPPED 0x01 70 #define SW_CLOSING 0x04 71 72 #ifdef _KERNEL 73 74 extern int swap_pager_avail; 75 extern int nsw_cluster_max; 76 77 struct xswdev; 78 int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len); 79 void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int); 80 vm_pindex_t swap_pager_find_least(vm_object_t object, vm_pindex_t pindex); 81 void swap_pager_swap_init(void); 82 int swap_pager_nswapdev(void); 83 int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_pindex_t); 84 void swap_pager_status(int *total, int *used); 85 u_long swap_pager_swapped_pages(vm_object_t object); 86 void swapoff_all(void); 87 bool swap_pager_init_object(vm_object_t object, void *handle, 88 struct ucred *cred, vm_ooffset_t size, vm_ooffset_t offset); 89 #endif /* _KERNEL */ 90 #endif /* _VM_SWAP_PAGER_H_ */ 91