1 /* 2 * Copyright (c) 2004, 2005 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Hiten Pandya <hmp@backplane.com>. 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 * 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 16 * distribution. 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. 20 * 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 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/sys/bio.h,v 1.1 2005/08/08 01:25:31 hmp Exp $ 35 */ 36 37 #ifndef _SYS_QUEUE_H_ 38 #include <sys/queue.h> 39 #endif 40 41 typedef void biodone_t(struct buf *); 42 43 /* 44 * BIO encapsulation for storage drivers and systems that do not require 45 * caching support for underlying blocks. 46 */ 47 struct bio { 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. */ 60 }; 61