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