152 lines
5.2 KiB
C
152 lines
5.2 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)buf.h 8.9 (Berkeley) 3/30/95
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* $FreeBSD$
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*/
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#ifndef _SYS_BIO_H_
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#define _SYS_BIO_H_
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#include <sys/queue.h>
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struct bio;
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struct iodone_chain {
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long ic_prev_flags;
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void (*ic_prev_iodone)(struct bio *);
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void *ic_prev_iodone_chain;
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struct {
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long ia_long;
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void *ia_ptr;
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} ic_args[5];
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};
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/*
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* The bio structure describes an I/O operation in the kernel.
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*/
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struct bio {
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u_int bio_cmd; /* I/O operation. */
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dev_t bio_dev; /* Device to do I/O on. */
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daddr_t bio_blkno; /* Underlying physical block number. */
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off_t bio_offset; /* Offset into file. */
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long bio_bcount; /* Valid bytes in buffer. */
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caddr_t bio_data; /* Memory, superblocks, indirect etc. */
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u_int bio_flags; /* BIO_ flags. */
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int bio_error; /* Errno for BIO_ERROR. */
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long bio_resid; /* Remaining I/0 in bytes. */
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void (*bio_done)(struct bio *);
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void *bio_driver1; /* Private use by the callee. */
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void *bio_driver2; /* Private use by the callee. */
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void *bio_caller1; /* Private use by the caller. */
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void *bio_caller2; /* Private use by the caller. */
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TAILQ_ENTRY(bio) bio_queue; /* Disksort queue. */
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const char *bio_attribute; /* Attribute for BIO_[GS]ETATTR */
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struct g_consumer *bio_from; /* GEOM linkage */
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struct g_provider *bio_to; /* GEOM linkage */
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off_t bio_length; /* Like bio_bcount */
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off_t bio_completed; /* Inverse of bio_resid */
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u_int bio_children; /* Number of spawned bios */
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/* XXX: these go away when bio chaining is introduced */
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daddr_t bio_pblkno; /* physical block number */
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struct iodone_chain *bio_done_chain;
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struct bio *bio_linkage;
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};
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/* bio_cmd */
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#define BIO_READ 0x00000001
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#define BIO_WRITE 0x00000002
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#define BIO_DELETE 0x00000004
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#define BIO_GETATTR 0x00000008
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#define BIO_SETATTR 0x00000010
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#define BIO_CMD1 0x40000000 /* Available for local hacks */
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#define BIO_CMD2 0x80000000 /* Available for local hacks */
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/* bio_flags */
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#define BIO_ERROR 0x00000001
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#define BIO_DONE 0x00000004
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#define BIO_FLAG2 0x40000000 /* Available for local hacks */
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#define BIO_FLAG1 0x80000000 /* Available for local hacks */
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#ifdef _KERNEL
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struct uio;
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struct devstat;
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struct bio_queue_head {
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TAILQ_HEAD(bio_queue, bio) queue;
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daddr_t last_pblkno;
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struct bio *insert_point;
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struct bio *switch_point;
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int busy;
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};
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static __inline void bioq_insert_tail(struct bio_queue_head *head,
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struct bio *bp);
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static __inline struct bio *bioq_first(struct bio_queue_head *head);
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static __inline void
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bioq_insert_tail(struct bio_queue_head *head, struct bio *bp)
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{
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TAILQ_INSERT_TAIL(&head->queue, bp, bio_queue);
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}
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static __inline struct bio *
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bioq_first(struct bio_queue_head *head)
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{
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return (TAILQ_FIRST(&head->queue));
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}
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void biodone(struct bio *bp);
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void biofinish(struct bio *bp, struct devstat *stat, int error);
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int biowait(struct bio *bp, const char *wchan);
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void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
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#define bioqdisksort(foo, bar) bioq_disksort(foo, bar)
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void bioq_init(struct bio_queue_head *head);
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void bioq_remove(struct bio_queue_head *head, struct bio *bp);
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int physio(dev_t dev, struct uio *uio, int ioflag);
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#define physread physio
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#define physwrite physio
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#endif /* _KERNEL */
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#endif /* !_SYS_BIO_H_ */
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