98 lines
3.7 KiB
C
98 lines
3.7 KiB
C
/* $OpenBSD: uvm_vnode.h,v 1.21 2022/10/20 13:31:52 mpi Exp $ */
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/* $NetBSD: uvm_vnode.h,v 1.9 2000/03/26 20:54:48 kleink Exp $ */
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/*
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*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor and
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* Washington University.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: Id: uvm_vnode.h,v 1.1.2.4 1997/10/03 21:18:24 chuck Exp
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*/
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#ifndef _UVM_UVM_VNODE_H_
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#define _UVM_UVM_VNODE_H_
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/*
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* uvm_vnode.h
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*
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* vnode handle into the VM system.
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*/
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struct vnode;
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/*
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* the uvm_vnode structure.
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*
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* Locks used to protect struct members in this file:
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* I immutable after creation
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* K kernel lock
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* S uvn_sync_lock
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* v u_obj's vmobjlock
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*/
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struct uvm_vnode {
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struct uvm_object u_obj; /* the actual VM object */
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struct vnode *u_vnode; /* [I] pointer back to vnode */
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int u_flags; /* [v] flags */
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int u_nio; /* [v] number of running I/O requests */
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voff_t u_size; /* [v] size of object */
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LIST_ENTRY(uvm_vnode) u_wlist; /* [K] list of writeable vnode objs */
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SIMPLEQ_ENTRY(uvm_vnode) u_syncq; /* [S] vnode objs due for a "sync" */
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};
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/*
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* u_flags values
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*/
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#define UVM_VNODE_VALID 0x001 /* we are attached to the vnode */
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#define UVM_VNODE_CANPERSIST 0x002 /* we can persist after ref == 0 */
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#define UVM_VNODE_ALOCK 0x004 /* uvn_attach is locked out */
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#define UVM_VNODE_DYING 0x008 /* final detach/terminate in
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progress */
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#define UVM_VNODE_RELKILL 0x010 /* uvn should be killed by releasepg
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when final i/o is done */
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#define UVM_VNODE_WANTED 0x020 /* someone is waiting for alock,
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dying, or relkill to clear */
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#define UVM_VNODE_VNISLOCKED 0x040 /* underlying vnode struct is locked
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(valid when DYING is true) */
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#define UVM_VNODE_IOSYNC 0x080 /* I/O sync in progress ... setter
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sleeps on &uvn->u_nio */
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#define UVM_VNODE_IOSYNCWANTED 0x100 /* a process is waiting for the
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i/o sync to clear so it can do
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i/o */
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#define UVM_VNODE_WRITEABLE 0x200 /* uvn has pages that are writeable */
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/*
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* UVM_VNODE_BLOCKED: any condition that should new processes from
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* touching the vnode [set WANTED and sleep to wait for it to clear]
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*/
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#define UVM_VNODE_BLOCKED (UVM_VNODE_ALOCK|UVM_VNODE_DYING|UVM_VNODE_RELKILL)
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#endif /* _UVM_UVM_VNODE_H_ */
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