vm_object.h revision 137297
1/* 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * The Mach Operating System project at Carnegie-Mellon University. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)vm_object.h 8.3 (Berkeley) 1/12/94 33 * 34 * 35 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 36 * All rights reserved. 37 * 38 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 39 * 40 * Permission to use, copy, modify and distribute this software and 41 * its documentation is hereby granted, provided that both the copyright 42 * notice and this permission notice appear in all copies of the 43 * software, derivative works or modified versions, and any portions 44 * thereof, and that both notices appear in supporting documentation. 45 * 46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 49 * 50 * Carnegie Mellon requests users of this software to return to 51 * 52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 53 * School of Computer Science 54 * Carnegie Mellon University 55 * Pittsburgh PA 15213-3890 56 * 57 * any improvements or extensions that they make and grant Carnegie the 58 * rights to redistribute these changes. 59 * 60 * $FreeBSD: head/sys/vm/vm_object.h 137297 2004-11-06 05:33:02Z alc $ 61 */ 62 63/* 64 * Virtual memory object module definitions. 65 */ 66 67#ifndef _VM_OBJECT_ 68#define _VM_OBJECT_ 69 70#include <sys/queue.h> 71#include <sys/_lock.h> 72#include <sys/_mutex.h> 73 74enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS, 75 OBJT_DEAD }; 76typedef u_char objtype_t; 77 78/* 79 * Types defined: 80 * 81 * vm_object_t Virtual memory object. 82 * 83 * List of locks 84 * (c) const until freed 85 * 86 */ 87 88struct vm_object { 89 struct mtx mtx; 90 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */ 91 LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */ 92 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */ 93 TAILQ_HEAD(, vm_page) memq; /* list of resident pages */ 94 vm_page_t root; /* root of the resident page splay tree */ 95 vm_pindex_t size; /* Object size */ 96 int generation; /* generation ID */ 97 int ref_count; /* How many refs?? */ 98 int shadow_count; /* how many objects that this is a shadow for */ 99 objtype_t type; /* type of pager */ 100 u_short flags; /* see below */ 101 u_short pg_color; /* (c) color of first page in obj */ 102 u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ 103 int resident_page_count; /* number of resident pages */ 104 struct vm_object *backing_object; /* object that I'm a shadow of */ 105 vm_ooffset_t backing_object_offset;/* Offset in backing object */ 106 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */ 107 void *handle; 108 union { 109 /* 110 * VNode pager 111 * 112 * vnp_size - current size of file 113 */ 114 struct { 115 off_t vnp_size; 116 } vnp; 117 118 /* 119 * Device pager 120 * 121 * devp_pglist - list of allocated pages 122 */ 123 struct { 124 TAILQ_HEAD(, vm_page) devp_pglist; 125 } devp; 126 127 /* 128 * Swap pager 129 * 130 * swp_bcount - number of swap 'swblock' metablocks, each 131 * contains up to 16 swapblk assignments. 132 * see vm/swap_pager.h 133 */ 134 struct { 135 int swp_bcount; 136 } swp; 137 } un_pager; 138}; 139 140/* 141 * Flags 142 */ 143#define OBJ_ACTIVE 0x0004 /* active objects */ 144#define OBJ_DEAD 0x0008 /* dead objects (during rundown) */ 145#define OBJ_NOSPLIT 0x0010 /* dont split this object */ 146#define OBJ_PIPWNT 0x0040 /* paging in progress wanted */ 147#define OBJ_WRITEABLE 0x0080 /* object has been made writable */ 148#define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */ 149#define OBJ_CLEANING 0x0200 150#define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */ 151#define OBJ_DISCONNECTWNT 0x4000 /* disconnect from vnode wanted */ 152 153#define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT) 154#define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT)) 155 156#ifdef _KERNEL 157 158#define OBJPC_SYNC 0x1 /* sync I/O */ 159#define OBJPC_INVAL 0x2 /* invalidate */ 160#define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */ 161 162TAILQ_HEAD(object_q, vm_object); 163 164extern struct object_q vm_object_list; /* list of allocated objects */ 165extern struct mtx vm_object_list_mtx; /* lock for object list and count */ 166 167extern struct vm_object kernel_object_store; 168extern struct vm_object kmem_object_store; 169 170#define kernel_object (&kernel_object_store) 171#define kmem_object (&kmem_object_store) 172 173#define VM_OBJECT_LOCK(object) mtx_lock(&(object)->mtx) 174#define VM_OBJECT_LOCK_ASSERT(object, type) \ 175 mtx_assert(&(object)->mtx, (type)) 176#define VM_OBJECT_LOCK_INIT(object, type) \ 177 mtx_init(&(object)->mtx, "vm object", \ 178 (type), MTX_DEF | MTX_DUPOK) 179#define VM_OBJECT_LOCKED(object) mtx_owned(&(object)->mtx) 180#define VM_OBJECT_MTX(object) (&(object)->mtx) 181#define VM_OBJECT_TRYLOCK(object) mtx_trylock(&(object)->mtx) 182#define VM_OBJECT_UNLOCK(object) mtx_unlock(&(object)->mtx) 183 184/* 185 * The object must be locked or thread private. 186 */ 187static __inline void 188vm_object_set_flag(vm_object_t object, u_short bits) 189{ 190 191 object->flags |= bits; 192} 193 194void vm_object_clear_flag(vm_object_t object, u_short bits); 195void vm_object_pip_add(vm_object_t object, short i); 196void vm_object_pip_subtract(vm_object_t object, short i); 197void vm_object_pip_wakeup(vm_object_t object); 198void vm_object_pip_wakeupn(vm_object_t object, short i); 199void vm_object_pip_wait(vm_object_t object, char *waitid); 200 201vm_object_t vm_object_allocate (objtype_t, vm_pindex_t); 202vm_object_t vm_object_allocate_wait (objtype_t, vm_pindex_t, int); 203void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t); 204boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t); 205void vm_object_collapse (vm_object_t); 206void vm_object_deallocate (vm_object_t); 207void vm_object_terminate (vm_object_t); 208void vm_object_vndeallocate (vm_object_t); 209void vm_object_set_writeable_dirty (vm_object_t); 210void vm_object_init (void); 211void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t); 212void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t); 213void vm_object_reference (vm_object_t); 214void vm_object_reference_locked(vm_object_t); 215void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t); 216void vm_object_split(vm_map_entry_t); 217void vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t, 218 boolean_t); 219void vm_object_madvise (vm_object_t, vm_pindex_t, int, int); 220#endif /* _KERNEL */ 221 222#endif /* _VM_OBJECT_ */ 223