2 * Copyright (c) 2004, 2005 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Hiten Pandya <hmp@backplane.com>.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/sys/bio.h,v 1.1 2005/08/08 01:25:31 hmp Exp $
38 #include <sys/queue.h>
41 typedef void biodone_t(struct buf *);
44 * BIO encapsulation for storage drivers and systems that do not require
45 * caching support for underlying blocks.
48 LIST_ENTRY(bio) bio_chain; /* Chaining. */
49 struct buf *bio_buf; /* High-level buffer back-pointer. */
50 daddr_t bio_lblkno; /* Logical block number. */
51 daddr_t bio_blkno; /* Underlying physical block number. */
52 daddr_t bio_pblkno; /* Physical block number. */
53 dev_t bio_dev; /* Device associated to this I/O. */
54 biodone_t *bio_done; /* Completion function (optional). */
55 long bio_resid; /* Remaining I/O. */
56 int bio_flags; /* Operational flags. */
57 int bio_error; /* Error value. */
58 void *bio_driver_ctx; /* Private context for drivers. */
59 void *bio_caller_ctx; /* Private context for callers. */