[unix-history] / sys / vm / vnode_pager.h

/*
 * Copyright (c) 1990 University of Utah.
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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 the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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: @(#)vnode_pager.h	7.1 (Berkeley) 12/5/90
 *	$Id: vnode_pager.h,v 1.4 1994/01/14 16:27:33 davidg Exp $
 */

#ifndef	_VNODE_PAGER_
#define	_VNODE_PAGER_	1

/*
 * VNODE pager private data.
 */
struct vnpager {
	int		vnp_flags;	/* flags */
	struct vnode	*vnp_vp;	/* vnode */
	vm_size_t	vnp_size;	/* vnode current size */
};
typedef struct vnpager	*vn_pager_t;

#define VN_PAGER_NULL	((vn_pager_t)0)

#define	VNP_PAGING	0x01		/* vnode used for pageout */
#define VNP_CACHED	0x02		/* vnode is cached */

#ifdef KERNEL

void		vnode_pager_init();
vm_pager_t	vnode_pager_alloc(caddr_t, vm_offset_t, vm_prot_t, vm_offset_t);
void		vnode_pager_dealloc();
int		vnode_pager_getpage();
int		vnode_pager_getmulti();
int		vnode_pager_putpage();
boolean_t	vnode_pager_haspage();

extern struct pagerops vnodepagerops;

#endif /* KERNEL */

#endif	/* _VNODE_PAGER_ */
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1990 University of Utah.
	3	* Copyright (c) 1991 The Regents of the University of California.
	4	* All rights reserved.
	5	*
	6	* This code is derived from software contributed to Berkeley by
	7	* the Systems Programming Group of the University of Utah Computer
	8	* Science Department.
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. All advertising materials mentioning features or use of this software
	19	* must display the following acknowledgement:
	20	* This product includes software developed by the University of
	21	* California, Berkeley and its contributors.
	22	* 4. Neither the name of the University nor the names of its contributors
	23	* may be used to endorse or promote products derived from this software
	24	* without specific prior written permission.
	25	*
	26	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	27	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	28	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	29	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	30	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	31	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	32	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	33	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	34	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	35	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	36	* SUCH DAMAGE.
	37	*
1284e777	38	* from: @(#)vnode_pager.h 7.1 (Berkeley) 12/5/90
ce619eaa	39	* $Id: vnode_pager.h,v 1.4 1994/01/14 16:27:33 davidg Exp $
15637ed4 RG	40	*/
	41
	42	#ifndef _VNODE_PAGER_
	43	#define _VNODE_PAGER_ 1
	44
	45	/*
	46	* VNODE pager private data.
	47	*/
	48	struct vnpager {
	49	int vnp_flags; /* flags */
	50	struct vnode vnp_vp; / vnode */
	51	vm_size_t vnp_size; /* vnode current size */
	52	};
	53	typedef struct vnpager *vn_pager_t;
	54
	55	#define VN_PAGER_NULL ((vn_pager_t)0)
	56
	57	#define VNP_PAGING 0x01 /* vnode used for pageout */
	58	#define VNP_CACHED 0x02 /* vnode is cached */
	59
	60	#ifdef KERNEL
	61
	62	void vnode_pager_init();
ce619eaa	63	vm_pager_t vnode_pager_alloc(caddr_t, vm_offset_t, vm_prot_t, vm_offset_t);
15637ed4	64	void vnode_pager_dealloc();
bbc3f849	65	int vnode_pager_getpage();
55768178	66	int vnode_pager_getmulti();
bbc3f849	67	int vnode_pager_putpage();
15637ed4 RG	68	boolean_t vnode_pager_haspage();
15637ed4 RG	69
bbc3f849	70	extern struct pagerops vnodepagerops;
15637ed4	71
bbc3f849	72	#endif /* KERNEL */
15637ed4 RG	73
15637ed4 RG	74	#endif /* _VNODE_PAGER_ */