common/vm/pvn.h

	pvn.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2002 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

#pragma ident   "%Z%%M% %I% %E% SMI"

#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);
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);

/*
 * 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 */