1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)buf.h 8.9 (Berkeley) 3/30/95 35 * $FreeBSD$ 36 */ 37 38 #ifndef _SYS_BIO_H_ 39 #define _SYS_BIO_H_ 40 41 #include <sys/queue.h> 42 43 /* bio_cmd */ 44 #define BIO_READ 0x01 45 #define BIO_WRITE 0x02 46 #define BIO_DELETE 0x04 47 #define BIO_GETATTR 0x08 48 #define BIO_FLUSH 0x10 49 #define BIO_CMD0 0x20 /* Available for local hacks */ 50 #define BIO_CMD1 0x40 /* Available for local hacks */ 51 #define BIO_CMD2 0x80 /* Available for local hacks */ 52 53 /* bio_flags */ 54 #define BIO_ERROR 0x01 55 #define BIO_DONE 0x02 56 #define BIO_ONQUEUE 0x04 57 #define BIO_ORDERED 0x08 58 59 #ifdef _KERNEL 60 struct disk; 61 struct bio; 62 63 /* Empty classifier tag, to prevent further classification. */ 64 #define BIO_NOTCLASSIFIED (void *)(~0UL) 65 66 typedef void bio_task_t(void *); 67 68 /* 69 * The bio structure describes an I/O operation in the kernel. 70 */ 71 struct bio { 72 uint8_t bio_cmd; /* I/O operation. */ 73 uint8_t bio_flags; /* General flags. */ 74 uint8_t bio_cflags; /* Private use by the consumer. */ 75 uint8_t bio_pflags; /* Private use by the provider. */ 76 struct cdev *bio_dev; /* Device to do I/O on. */ 77 struct disk *bio_disk; /* Valid below geom_disk.c only */ 78 off_t bio_offset; /* Offset into file. */ 79 long bio_bcount; /* Valid bytes in buffer. */ 80 caddr_t bio_data; /* Memory, superblocks, indirect etc. */ 81 int bio_error; /* Errno for BIO_ERROR. */ 82 long bio_resid; /* Remaining I/O in bytes. */ 83 void (*bio_done)(struct bio *); 84 void *bio_driver1; /* Private use by the provider. */ 85 void *bio_driver2; /* Private use by the provider. */ 86 void *bio_caller1; /* Private use by the consumer. */ 87 void *bio_caller2; /* Private use by the consumer. */ 88 TAILQ_ENTRY(bio) bio_queue; /* Disksort queue. */ 89 const char *bio_attribute; /* Attribute for BIO_[GS]ETATTR */ 90 struct g_consumer *bio_from; /* GEOM linkage */ 91 struct g_provider *bio_to; /* GEOM linkage */ 92 off_t bio_length; /* Like bio_bcount */ 93 off_t bio_completed; /* Inverse of bio_resid */ 94 u_int bio_children; /* Number of spawned bios */ 95 u_int bio_inbed; /* Children safely home by now */ 96 struct bio *bio_parent; /* Pointer to parent */ 97 struct bintime bio_t0; /* Time request started */ 98 99 bio_task_t *bio_task; /* Task_queue handler */ 100 void *bio_task_arg; /* Argument to above */ 101 102 void *bio_classifier1; /* Classifier tag. */ 103 void *bio_classifier2; /* Classifier tag. */ 104 105 #ifdef DIAGNOSTIC 106 void *_bio_caller1; 107 void *_bio_caller2; 108 uint8_t _bio_cflags; 109 #endif 110 111 /* XXX: these go away when bio chaining is introduced */ 112 daddr_t bio_pblkno; /* physical block number */ 113 }; 114 115 struct uio; 116 struct devstat; 117 118 struct bio_queue_head { 119 TAILQ_HEAD(bio_queue, bio) queue; 120 off_t last_offset; 121 struct bio *insert_point; 122 }; 123 124 void biodone(struct bio *bp); 125 void biofinish(struct bio *bp, struct devstat *stat, int error); 126 int biowait(struct bio *bp, const char *wchan); 127 128 void bioq_disksort(struct bio_queue_head *ap, struct bio *bp); 129 struct bio *bioq_first(struct bio_queue_head *head); 130 struct bio *bioq_takefirst(struct bio_queue_head *head); 131 void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error); 132 void bioq_init(struct bio_queue_head *head); 133 void bioq_insert_head(struct bio_queue_head *head, struct bio *bp); 134 void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp); 135 void bioq_remove(struct bio_queue_head *head, struct bio *bp); 136 137 void bio_taskqueue(struct bio *bp, bio_task_t *fund, void *arg); 138 139 int physio(struct cdev *dev, struct uio *uio, int ioflag); 140 #define physread physio 141 #define physwrite physio 142 143 #endif /* _KERNEL */ 144 145 #endif /* !_SYS_BIO_H_ */ 146