uvm_vnode.h revision 1.20 
1/*	$OpenBSD: uvm_vnode.h,v 1.20 2022/09/21 07:32:59 mpi Exp $	*/
2/*	$NetBSD: uvm_vnode.h,v 1.9 2000/03/26 20:54:48 kleink Exp $	*/
3
4/*
5 *
6 * Copyright (c) 1997 Charles D. Cranor and Washington University.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *      This product includes software developed by Charles D. Cranor and
20 *      Washington University.
21 * 4. The name of the author may not be used to endorse or promote products
22 *    derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * from: Id: uvm_vnode.h,v 1.1.2.4 1997/10/03 21:18:24 chuck Exp
36 */
37
38#ifndef _UVM_UVM_VNODE_H_
39#define _UVM_UVM_VNODE_H_
40
41/*
42 * uvm_vnode.h
43 *
44 * vnode handle into the VM system.
45 */
46
47/*
48 * the uvm_vnode structure.
49 */
50
51struct vnode;
52
53struct uvm_vnode {
54	struct uvm_object u_obj;	/* the actual VM object */
55	struct vnode *u_vnode;		/* pointer back to vnode */
56	int u_flags;			/* flags */
57	int u_nio;			/* number of running I/O requests */
58	voff_t u_size;			/* size of object */
59
60	/* the following entry is locked by uvn_wl_lock */
61	LIST_ENTRY(uvm_vnode) u_wlist;	/* list of writeable vnode objects */
62
63	/* the following entry is locked by uvn_sync_lock */
64	SIMPLEQ_ENTRY(uvm_vnode) u_syncq; /* vnode objects due for a "sync" */
65};
66
67/*
68 * u_flags values
69 */
70#define UVM_VNODE_VALID		0x001	/* we are attached to the vnode */
71#define UVM_VNODE_CANPERSIST	0x002	/* we can persist after ref == 0 */
72#define UVM_VNODE_ALOCK		0x004	/* uvn_attach is locked out */
73#define UVM_VNODE_DYING		0x008	/* final detach/terminate in
74					   progress */
75#define UVM_VNODE_RELKILL	0x010	/* uvn should be killed by releasepg
76					   when final i/o is done */
77#define UVM_VNODE_WANTED	0x020	/* someone is waiting for alock,
78					   dying, or relkill to clear */
79#define UVM_VNODE_VNISLOCKED	0x040	/* underlying vnode struct is locked
80					   (valid when DYING is true) */
81#define UVM_VNODE_IOSYNC	0x080	/* I/O sync in progress ... setter
82					   sleeps on &uvn->u_nio */
83#define UVM_VNODE_IOSYNCWANTED	0x100	/* a process is waiting for the
84					   i/o sync to clear so it can do
85					   i/o */
86#define UVM_VNODE_WRITEABLE	0x200	/* uvn has pages that are writeable */
87
88/*
89 * UVM_VNODE_BLOCKED: any condition that should new processes from
90 * touching the vnode [set WANTED and sleep to wait for it to clear]
91 */
92#define UVM_VNODE_BLOCKED (UVM_VNODE_ALOCK|UVM_VNODE_DYING|UVM_VNODE_RELKILL)
93
94#endif /* _UVM_UVM_VNODE_H_ */
95