usr/src/uts/common/sys/fbuf.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 (c) 1997-1998 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30
  31 #ifndef _SYS_FBUF_H
  32 #define _SYS_FBUF_H
  33
  34 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.3   */
  35
  36 #include <sys/vnode.h>
  37
  38 #ifdef  __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 /*
  43  * A struct fbuf is used to get a mapping to part of a file using the
  44  * segkmap facilities.  After you get a mapping, you can fbrelse() it
  45  * (giving a seg code to pass back to segmap_release), you can fbwrite()
  46  * it (causes a synchronous write back using the file mapping information),
  47  * or you can fbiwrite it (causing indirect synchronous write back to
  48  * the block number given without using the file mapping information).
  49  */
  50
  51 struct fbuf {
  52         caddr_t fb_addr;
  53         uint_t  fb_count;
  54 };
  55
  56 #if defined(__STDC__)
  57 extern int fbread(struct vnode *, offset_t, uint_t, enum seg_rw,
  58     struct fbuf **);
  59 extern void fbzero(struct vnode *, offset_t, uint_t, struct fbuf **);
  60 extern int fbwrite(struct fbuf *);
  61 extern int fbdwrite(struct fbuf *);
  62 extern int fbiwrite(struct fbuf *, struct vnode *, daddr_t bn, int bsize);
  63 extern void fbrelse(struct fbuf *, enum seg_rw);
  64 #endif
  65
  66 #ifdef  __cplusplus
  67 }
  68 #endif
  69
  70 #endif  /* _SYS_FBUF_H */