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 * $FreeBSD$
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 /*
75 * Types defined:
76 *
77 * vm_object_t Virtual memory object.
78 *
79 * List of locks
80 * (c) const until freed
81 *
82 */
83
84 struct vm_object {
85 struct mtx mtx;
86 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
87 LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
88 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
89 TAILQ_HEAD(, vm_page) memq; /* list of resident pages */
90 vm_page_t root; /* root of the resident page splay tree */
91 vm_pindex_t size; /* Object size */
92 int generation; /* generation ID */
93 int ref_count; /* How many refs?? */
94 int shadow_count; /* how many objects that this is a shadow for */
95 objtype_t type; /* type of pager */
96 u_short flags; /* see below */
97 u_short pg_color; /* (c) color of first page in obj */
98 u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
99 int resident_page_count; /* number of resident pages */
100 struct vm_object *backing_object; /* object that I'm a shadow of */
101 vm_ooffset_t backing_object_offset;/* Offset in backing object */
102 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
103 vm_page_t cache; /* root of the cache page splay tree */
104 void *handle;
105 union {
106 /*
107 * VNode pager
108 *
109 * vnp_size - current size of file
110 */
111 struct {
112 off_t vnp_size;
113 } vnp;
114
115 /*
116 * Device pager
117 *
118 * devp_pglist - list of allocated pages
119 */
120 struct {
121 TAILQ_HEAD(, vm_page) devp_pglist;
122 } devp;
123
124 /*
125 * Swap pager
126 *
127 * swp_bcount - number of swap 'swblock' metablocks, each
128 * contains up to 16 swapblk assignments.
129 * see vm/swap_pager.h
130 */
131 struct {
132 int swp_bcount;
133 } swp;
134 } un_pager;
135 };
136
137 /*
138 * Flags
139 */
140 #define OBJ_ACTIVE 0x0004 /* active objects */
141 #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */
142 #define OBJ_NOSPLIT 0x0010 /* dont split this object */
143 #define OBJ_PIPWNT 0x0040 /* paging in progress wanted */
144 #define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */
145 #define OBJ_CLEANING 0x0200
146 #define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */
147 #define OBJ_DISCONNECTWNT 0x4000 /* disconnect from vnode wanted */
148 #define OBJ_NEEDGIANT 0x8000 /* object requires Giant */
149
150 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
151 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
152
153 #ifdef _KERNEL
154
155 #define OBJPC_SYNC 0x1 /* sync I/O */
156 #define OBJPC_INVAL 0x2 /* invalidate */
157 #define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */
158
159 TAILQ_HEAD(object_q, vm_object);
160
161 extern struct object_q vm_object_list; /* list of allocated objects */
162 extern struct mtx vm_object_list_mtx; /* lock for object list and count */
163
164 extern struct vm_object kernel_object_store;
165 extern struct vm_object kmem_object_store;
166
167 #define kernel_object (&kernel_object_store)
168 #define kmem_object (&kmem_object_store)
169
170 #define VM_OBJECT_LOCK(object) mtx_lock(&(object)->mtx)
171 #define VM_OBJECT_LOCK_ASSERT(object, type) \
172 mtx_assert(&(object)->mtx, (type))
173 #define VM_OBJECT_LOCK_INIT(object, type) \
174 mtx_init(&(object)->mtx, "vm object", \
175 (type), MTX_DEF | MTX_DUPOK)
176 #define VM_OBJECT_LOCKED(object) mtx_owned(&(object)->mtx)
177 #define VM_OBJECT_MTX(object) (&(object)->mtx)
178 #define VM_OBJECT_TRYLOCK(object) mtx_trylock(&(object)->mtx)
179 #define VM_OBJECT_UNLOCK(object) mtx_unlock(&(object)->mtx)
180
181 /*
182 * The object must be locked or thread private.
183 */
184 static __inline void
185 vm_object_set_flag(vm_object_t object, u_short bits)
186 {
187
188 object->flags |= bits;
189 }
190
191 void vm_object_clear_flag(vm_object_t object, u_short bits);
192 void vm_object_pip_add(vm_object_t object, short i);
193 void vm_object_pip_subtract(vm_object_t object, short i);
194 void vm_object_pip_wakeup(vm_object_t object);
195 void vm_object_pip_wakeupn(vm_object_t object, short i);
196 void vm_object_pip_wait(vm_object_t object, char *waitid);
197
198 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
199 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
200 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t);
201 void vm_object_collapse (vm_object_t);
202 void vm_object_deallocate (vm_object_t);
203 void vm_object_terminate (vm_object_t);
204 void vm_object_set_writeable_dirty (vm_object_t);
205 void vm_object_init (void);
206 void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
207 void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
208 void vm_object_reference (vm_object_t);
209 void vm_object_reference_locked(vm_object_t);
210 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
211 void vm_object_split(vm_map_entry_t);
212 void vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
213 boolean_t);
214 void vm_object_madvise (vm_object_t, vm_pindex_t, int, int);
215 #endif /* _KERNEL */
216
217 #endif /* _VM_OBJECT_ */
Cache object: 166499459df714f0c8b3503a1c6abb64
|