1 /*- 2 * Copyright (c) 1990 University of Utah. 3 * Copyright (c) 1991 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90 35 * $FreeBSD$ 36 */ 37 38 #ifndef _VM_SWAP_PAGER_H_ 39 #define _VM_SWAP_PAGER_H_ 1 40 41 typedef int32_t swblk_t; /* 42 * swap offset. This is the type used to 43 * address the "virtual swap device" and 44 * therefore the maximum swap space is 45 * 2^32 pages. 46 */ 47 48 struct buf; 49 struct swdevt; 50 typedef void sw_strategy_t(struct buf *, struct swdevt *); 51 typedef void sw_close_t(struct thread *, struct swdevt *); 52 53 /* 54 * Swap device table 55 */ 56 struct swdevt { 57 int sw_flags; 58 int sw_nblks; 59 int sw_used; 60 dev_t sw_dev; 61 struct vnode *sw_vp; 62 void *sw_id; 63 swblk_t sw_first; 64 swblk_t sw_end; 65 struct blist *sw_blist; 66 TAILQ_ENTRY(swdevt) sw_list; 67 sw_strategy_t *sw_strategy; 68 sw_close_t *sw_close; 69 }; 70 71 #define SW_UNMAPPED 0x01 72 #define SW_CLOSING 0x04 73 74 #ifdef _KERNEL 75 76 extern int swap_pager_full; 77 extern int swap_pager_avail; 78 79 struct xswdev; 80 int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len); 81 void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int); 82 void swap_pager_freespace(vm_object_t, vm_pindex_t, vm_size_t); 83 void swap_pager_swap_init(void); 84 int swap_pager_isswapped(vm_object_t, struct swdevt *); 85 int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_size_t); 86 void swap_pager_status(int *total, int *used); 87 void swapoff_all(void); 88 89 #endif /* _KERNEL */ 90 #endif /* _VM_SWAP_PAGER_H_ */ 91