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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#ifndef _VM_PVN_H
#define _VM_PVN_H
#include <sys/buf.h>
#include <vm/seg.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifdef _KERNEL
/*
* VM - paged vnode.
*
* The VM system manages memory as a cache of paged vnodes.
* This file desribes the interfaces to common subroutines
* used to help implement the VM/file system routines.
*/
struct page *pvn_read_kluster(struct vnode *vp, u_offset_t off,
struct seg *seg, caddr_t addr, u_offset_t *offp,
size_t *lenp, u_offset_t vp_off, size_t vp_len,
int isra);
struct page *pvn_write_kluster(struct vnode *vp, struct page *pp,
u_offset_t *offp, size_t *lenp, u_offset_t vp_off,
size_t vp_len, int flags);
void pvn_read_done(struct page *plist, int flags);
void pvn_write_done(struct page *plist, int flags);
void pvn_io_done(struct page *plist);
int pvn_vplist_dirty(struct vnode *vp, u_offset_t off,
int (*putapage)(vnode_t *, struct page *, u_offset_t *,
size_t *, int, cred_t *),
int flags, struct cred *cred);
void pvn_vplist_setdirty(vnode_t *vp, int (*page_check)(page_t *));
int pvn_getdirty(struct page *pp, int flags);
void pvn_vpzero(struct vnode *vp, u_offset_t vplen, size_t zbytes);
int pvn_getpages(
int (*getpage)(vnode_t *, u_offset_t, size_t, uint_t *,
struct page *[], size_t, struct seg *,
caddr_t, enum seg_rw, cred_t *),
struct vnode *vp, u_offset_t off, size_t len,
uint_t *protp, struct page **pl, size_t plsz,
struct seg *seg, caddr_t addr, enum seg_rw rw,
struct cred *cred);
void pvn_plist_init(struct page *pp, struct page **pl, size_t plsz,
u_offset_t off, size_t io_len, enum seg_rw rw);
void pvn_init(void);
/*
* The value is put in p_hash to identify marker pages. It is safe to
* test p_hash ==(!=) PVN_VPLIST_HASH_TAG even without holding p_selock.
*/
#define PVN_VPLIST_HASH_TAG ((page_t *)-1)
/*
* When requesting pages from the getpage routines, pvn_getpages will
* allocate space to return PVN_GETPAGE_NUM pages which map PVN_GETPAGE_SZ
* worth of bytes. These numbers are chosen to be the minimum of the max's
* given in terms of bytes and pages.
*/
#define PVN_MAX_GETPAGE_SZ 0x10000 /* getpage size limit */
#define PVN_MAX_GETPAGE_NUM 0x8 /* getpage page limit */
#if PVN_MAX_GETPAGE_SZ > PVN_MAX_GETPAGE_NUM * PAGESIZE
#define PVN_GETPAGE_SZ ptob(PVN_MAX_GETPAGE_NUM)
#define PVN_GETPAGE_NUM PVN_MAX_GETPAGE_NUM
#else
#define PVN_GETPAGE_SZ PVN_MAX_GETPAGE_SZ
#define PVN_GETPAGE_NUM btop(PVN_MAX_GETPAGE_SZ)
#endif
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _VM_PVN_H */
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