/*
 * 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)

#endif  /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _VM_PVN_H */