FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_object.h
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: releng/5.3/sys/vm/vm_object.h 132627 2004-07-25 07:48:47Z 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
74 enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS,
75 OBJT_DEAD };
76 typedef 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
88 struct 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
152 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
153 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
154
155 #ifdef _KERNEL
156
157 #define OBJPC_SYNC 0x1 /* sync I/O */
158 #define OBJPC_INVAL 0x2 /* invalidate */
159 #define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */
160
161 TAILQ_HEAD(object_q, vm_object);
162
163 extern struct object_q vm_object_list; /* list of allocated objects */
164 extern struct mtx vm_object_list_mtx; /* lock for object list and count */
165
166 extern struct vm_object kernel_object_store;
167 extern struct vm_object kmem_object_store;
168
169 #define kernel_object (&kernel_object_store)
170 #define kmem_object (&kmem_object_store)
171
172 #define VM_OBJECT_LOCK(object) mtx_lock(&(object)->mtx)
173 #define VM_OBJECT_LOCK_ASSERT(object, type) \
174 mtx_assert(&(object)->mtx, (type))
175 #define VM_OBJECT_LOCK_INIT(object, type) \
176 mtx_init(&(object)->mtx, "vm object", \
177 (type), MTX_DEF | MTX_DUPOK)
178 #define VM_OBJECT_LOCKED(object) mtx_owned(&(object)->mtx)
179 #define VM_OBJECT_MTX(object) (&(object)->mtx)
180 #define VM_OBJECT_TRYLOCK(object) mtx_trylock(&(object)->mtx)
181 #define VM_OBJECT_UNLOCK(object) mtx_unlock(&(object)->mtx)
182
183 /*
184 * The object must be locked or thread private.
185 */
186 static __inline void
187 vm_object_set_flag(vm_object_t object, u_short bits)
188 {
189
190 object->flags |= bits;
191 }
192
193 void vm_object_clear_flag(vm_object_t object, u_short bits);
194 void vm_object_pip_add(vm_object_t object, short i);
195 void vm_object_pip_subtract(vm_object_t object, short i);
196 void vm_object_pip_wakeup(vm_object_t object);
197 void vm_object_pip_wakeupn(vm_object_t object, short i);
198 void vm_object_pip_wait(vm_object_t object, char *waitid);
199
200 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
201 vm_object_t vm_object_allocate_wait (objtype_t, vm_pindex_t, int);
202 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
203 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t);
204 void vm_object_collapse (vm_object_t);
205 void vm_object_deallocate (vm_object_t);
206 void vm_object_terminate (vm_object_t);
207 void vm_object_vndeallocate (vm_object_t);
208 void vm_object_set_writeable_dirty (vm_object_t);
209 void vm_object_init (void);
210 void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
211 void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
212 void vm_object_reference (vm_object_t);
213 void vm_object_reference_locked(vm_object_t);
214 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
215 void vm_object_split(vm_map_entry_t);
216 void vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
217 boolean_t);
218 void vm_object_madvise (vm_object_t, vm_pindex_t, int, int);
219 #endif /* _KERNEL */
220
221 #endif /* _VM_OBJECT_ */
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