sys/uvm/uvm_readahead.h

   1 /*      $NetBSD: uvm_readahead.h,v 1.4 2009/06/10 01:54:08 yamt Exp $   */
   2
   3 /*-
   4  * Copyright (c)2003, 2005, 2009 YAMAMOTO Takashi,
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #if !defined(_UVM_UVM_READAHEAD_H_)
  30 #define _UVM_UVM_READAHEAD_H_
  31
  32 struct uvm_object;
  33 struct uvm_ractx;
  34
  35 void uvm_ra_init(void);
  36 struct uvm_ractx *uvm_ra_allocctx(void);
  37 void uvm_ra_freectx(struct uvm_ractx *);
  38 void uvm_ra_request(struct uvm_ractx *, int, struct uvm_object *, off_t,
  39     size_t);
  40 int uvm_readahead(struct uvm_object *, off_t, off_t);
  41
  42 #endif /* defined(_UVM_UVM_READAHEAD_H_) */