Annotation of sys/uvm/uvm_vnode.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: uvm_vnode.h,v 1.12 2002/03/14 01:27:19 millert 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. put at the top of the vnode data structure.
49: * this allows:
50: * (struct vnode *) == (struct uvm_vnode *) == (struct uvm_object *)
51: */
52:
53: struct uvm_vnode {
54: struct uvm_object u_obj; /* the actual VM object */
55: int u_flags; /* flags */
56: int u_nio; /* number of running I/O requests */
57: voff_t u_size; /* size of object */
58:
59: /* the following entry is locked by uvn_wl_lock */
60: LIST_ENTRY(uvm_vnode) u_wlist; /* list of writeable vnode objects */
61:
62: /* the following entry is locked by uvn_sync_lock */
63: SIMPLEQ_ENTRY(uvm_vnode) u_syncq; /* vnode objects due for a "sync" */
64: };
65:
66: /*
67: * u_flags values
68: */
69: #define UVM_VNODE_VALID 0x001 /* we are attached to the vnode */
70: #define UVM_VNODE_CANPERSIST 0x002 /* we can persist after ref == 0 */
71: #define UVM_VNODE_ALOCK 0x004 /* uvn_attach is locked out */
72: #define UVM_VNODE_DYING 0x008 /* final detach/terminate in
73: progress */
74: #define UVM_VNODE_RELKILL 0x010 /* uvn should be killed by releasepg
75: when final i/o is done */
76: #define UVM_VNODE_WANTED 0x020 /* someone is waiting for alock,
77: dying, or relkill to clear */
78: #define UVM_VNODE_VNISLOCKED 0x040 /* underlying vnode struct is locked
79: (valid when DYING is true) */
80: #define UVM_VNODE_IOSYNC 0x080 /* I/O sync in progress ... setter
81: sleeps on &uvn->u_nio */
82: #define UVM_VNODE_IOSYNCWANTED 0x100 /* a process is waiting for the
83: i/o sync to clear so it can do
84: i/o */
85: #define UVM_VNODE_WRITEABLE 0x200 /* uvn has pages that are writeable */
86:
87: /*
88: * UVM_VNODE_BLOCKED: any condition that should new processes from
89: * touching the vnode [set WANTED and sleep to wait for it to clear]
90: */
91: #define UVM_VNODE_BLOCKED (UVM_VNODE_ALOCK|UVM_VNODE_DYING|UVM_VNODE_RELKILL)
92:
93: #ifdef _KERNEL
94:
95: /*
96: * prototypes
97: */
98:
99: #if 0
100: /*
101: * moved uvn_attach to uvm_extern.h because uvm_vnode.h is needed to
102: * include sys/vnode.h, and files that include sys/vnode.h don't know
103: * what a vm_prot_t is.
104: */
105: struct uvm_object *uvn_attach(void *, vm_prot_t);
106: #endif
107:
108: #endif /* _KERNEL */
109:
110: #endif /* _UVM_UVM_VNODE_H_ */
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