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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 /*
     31  * University Copyright- Copyright (c) 1982, 1986, 1988
     32  * The Regents of the University of California
     33  * All Rights Reserved
     34  *
     35  * University Acknowledgment- Portions of this document are derived from
     36  * software developed by the University of California, Berkeley, and its
     37  * contributors.
     38  */
     39 
     40 #ifndef	_VM_PVN_H
     41 #define	_VM_PVN_H
     42 
     43 #pragma ident	"@(#)pvn.h	1.54	05/06/08 SMI"
     44 
     45 #include <sys/buf.h>
     46 #include <vm/seg.h>
     47 
     48 #ifdef	__cplusplus
     49 extern "C" {
     50 #endif
     51 
     52 #ifdef	_KERNEL
     53 
     54 /*
     55  * VM - paged vnode.
     56  *
     57  * The VM system manages memory as a cache of paged vnodes.
     58  * This file desribes the interfaces to common subroutines
     59  * used to help implement the VM/file system routines.
     60  */
     61 
     62 struct page	*pvn_read_kluster(struct vnode *vp, u_offset_t off,
     63 			struct seg *seg, caddr_t addr, u_offset_t *offp,
     64 			size_t *lenp, u_offset_t vp_off, size_t vp_len,
     65 			int isra);
     66 struct page	*pvn_write_kluster(struct vnode *vp, struct page *pp,
     67 			u_offset_t *offp, size_t *lenp, u_offset_t vp_off,
     68 			size_t vp_len, int flags);
     69 void		pvn_read_done(struct page *plist, int flags);
     70 void		pvn_write_done(struct page *plist, int flags);
     71 void		pvn_io_done(struct page *plist);
     72 int		pvn_vplist_dirty(struct vnode *vp, u_offset_t off,
     73 			int (*putapage)(vnode_t *, struct page *, u_offset_t *,
     74 				size_t *, int, cred_t *),
     75 			int flags, struct cred *cred);
     76 int		pvn_getdirty(struct page *pp, int flags);
     77 void		pvn_vpzero(struct vnode *vp, u_offset_t vplen, size_t zbytes);
     78 int		pvn_getpages(
     79 			int (*getpage)(vnode_t *, u_offset_t, size_t, uint_t *,
     80 				struct page *[], size_t, struct seg *,
     81 				caddr_t, enum seg_rw, cred_t *),
     82 			struct vnode *vp, u_offset_t off, size_t len,
     83 			uint_t *protp, struct page **pl, size_t plsz,
     84 			struct seg *seg, caddr_t addr, enum seg_rw rw,
     85 			struct cred *cred);
     86 void		pvn_plist_init(struct page *pp, struct page **pl, size_t plsz,
     87 			u_offset_t off, size_t io_len, enum seg_rw rw);
     88 void		pvn_init(void);
     89 
     90 /*
     91  * When requesting pages from the getpage routines, pvn_getpages will
     92  * allocate space to return PVN_GETPAGE_NUM pages which map PVN_GETPAGE_SZ
     93  * worth of bytes.  These numbers are chosen to be the minimum of the max's
     94  * given in terms of bytes and pages.
     95  */
     96 #define	PVN_MAX_GETPAGE_SZ	0x10000		/* getpage size limit */
     97 #define	PVN_MAX_GETPAGE_NUM	0x8		/* getpage page limit */
     98 
     99 #if PVN_MAX_GETPAGE_SZ > PVN_MAX_GETPAGE_NUM * PAGESIZE
    100 
    101 #define	PVN_GETPAGE_SZ	ptob(PVN_MAX_GETPAGE_NUM)
    102 #define	PVN_GETPAGE_NUM	PVN_MAX_GETPAGE_NUM
    103 
    104 #else
    105 
    106 #define	PVN_GETPAGE_SZ	PVN_MAX_GETPAGE_SZ
    107 #define	PVN_GETPAGE_NUM	btop(PVN_MAX_GETPAGE_SZ)
    108 
    109 #endif
    110 
    111 #endif	/* _KERNEL */
    112 
    113 #ifdef	__cplusplus
    114 }
    115 #endif
    116 
    117 #endif	/* _VM_PVN_H */
    118