usr/src/uts/common/vm/pvn.h

   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   "%Z%%M% %I%     %E% 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 */