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Diffstat (limited to 'freebsd/sys/sys/bio.h')
| -rw-r--r-- | freebsd/sys/sys/bio.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/freebsd/sys/sys/bio.h b/freebsd/sys/sys/bio.h new file mode 100644 index 00000000..1dab6155 --- /dev/null +++ b/freebsd/sys/sys/bio.h @@ -0,0 +1,184 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1982, 1986, 1989, 1993 + * The Regents of the University of California. All rights reserved. + * (c) UNIX System Laboratories, Inc. + * All or some portions of this file are derived from material licensed + * to the University of California by American Telephone and Telegraph + * Co. or Unix System Laboratories, Inc. and are reproduced herein with + * the permission of UNIX System Laboratories, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)buf.h 8.9 (Berkeley) 3/30/95 + * $FreeBSD$ + */ + +#ifndef _SYS_BIO_H_ +#define _SYS_BIO_H_ + +#include <sys/queue.h> +#include <sys/disk_zone.h> + +/* bio_cmd */ +#define BIO_READ 0x01 /* Read I/O data */ +#define BIO_WRITE 0x02 /* Write I/O data */ +#define BIO_DELETE 0x03 /* TRIM or free blocks, i.e. mark as unused */ +#define BIO_GETATTR 0x04 /* Get GEOM attributes of object */ +#define BIO_FLUSH 0x05 /* Commit outstanding I/O now */ +#define BIO_CMD0 0x06 /* Available for local hacks */ +#define BIO_CMD1 0x07 /* Available for local hacks */ +#define BIO_CMD2 0x08 /* Available for local hacks */ +#define BIO_ZONE 0x09 /* Zone command */ + +/* bio_flags */ +#define BIO_ERROR 0x01 /* An error occurred processing this bio. */ +#define BIO_DONE 0x02 /* This bio is finished. */ +#define BIO_ONQUEUE 0x04 /* This bio is in a queue & not yet taken. */ +/* + * This bio must be executed after all previous bios in the queue have been + * executed, and before any successive bios can be executed. + */ +#define BIO_ORDERED 0x08 +#define BIO_UNMAPPED 0x10 +#define BIO_TRANSIENT_MAPPING 0x20 +#define BIO_VLIST 0x40 + +#ifdef _KERNEL +struct disk; +struct bio; +struct vm_map; + +/* Empty classifier tag, to prevent further classification. */ +#define BIO_NOTCLASSIFIED (void *)(~0UL) + +typedef void bio_task_t(void *); + +/* + * The bio structure describes an I/O operation in the kernel. + */ +struct bio { + uint16_t bio_cmd; /* I/O operation. */ + uint16_t bio_flags; /* General flags. */ + uint16_t bio_cflags; /* Private use by the consumer. */ + uint16_t bio_pflags; /* Private use by the provider. */ + struct cdev *bio_dev; /* Device to do I/O on. */ + struct disk *bio_disk; /* Valid below geom_disk.c only */ + off_t bio_offset; /* Offset into file. */ + long bio_bcount; /* Valid bytes in buffer. */ + caddr_t bio_data; /* Memory, superblocks, indirect etc. */ + struct vm_page **bio_ma; /* Or unmapped. */ + int bio_ma_offset; /* Offset in the first page of bio_ma. */ + int bio_ma_n; /* Number of pages in bio_ma. */ + int bio_error; /* Errno for BIO_ERROR. */ + long bio_resid; /* Remaining I/O in bytes. */ + void (*bio_done)(struct bio *); + void *bio_driver1; /* Private use by the provider. */ + void *bio_driver2; /* Private use by the provider. */ + void *bio_caller1; /* Private use by the consumer. */ + void *bio_caller2; /* Private use by the consumer. */ + TAILQ_ENTRY(bio) bio_queue; /* Disksort queue. */ + const char *bio_attribute; /* Attribute for BIO_[GS]ETATTR */ + struct disk_zone_args bio_zone;/* Used for BIO_ZONE */ + struct g_consumer *bio_from; /* GEOM linkage */ + struct g_provider *bio_to; /* GEOM linkage */ + off_t bio_length; /* Like bio_bcount */ + off_t bio_completed; /* Inverse of bio_resid */ + u_int bio_children; /* Number of spawned bios */ + u_int bio_inbed; /* Children safely home by now */ + struct bio *bio_parent; /* Pointer to parent */ + struct bintime bio_t0; /* Time request started */ + + bio_task_t *bio_task; /* Task_queue handler */ + void *bio_task_arg; /* Argument to above */ + + void *bio_classifier1; /* Classifier tag. */ + void *bio_classifier2; /* Classifier tag. */ + +#ifdef DIAGNOSTIC + void *_bio_caller1; + void *_bio_caller2; + uint8_t _bio_cflags; +#endif +#if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING) + struct buf *bio_track_bp; /* Parent buf for tracking */ +#endif + + /* XXX: these go away when bio chaining is introduced */ + daddr_t bio_pblkno; /* physical block number */ +}; + +struct uio; +struct devstat; + +struct bio_queue_head { + TAILQ_HEAD(bio_queue, bio) queue; + off_t last_offset; + struct bio *insert_point; + int total; + int batched; +}; + +extern struct vm_map *bio_transient_map; +extern int bio_transient_maxcnt; + +void biodone(struct bio *bp); +void biofinish(struct bio *bp, struct devstat *stat, int error); +int biowait(struct bio *bp, const char *wchan); + +#if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING) +void biotrack_buf(struct bio *bp, const char *location); + +static __inline void +biotrack(struct bio *bp, const char *location) +{ + + if (bp->bio_track_bp != NULL) + biotrack_buf(bp, location); +} +#else +static __inline void +biotrack(struct bio *bp __unused, const char *location __unused) +{ +} +#endif + +void bioq_disksort(struct bio_queue_head *ap, struct bio *bp); +struct bio *bioq_first(struct bio_queue_head *head); +struct bio *bioq_takefirst(struct bio_queue_head *head); +void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error); +void bioq_init(struct bio_queue_head *head); +void bioq_insert_head(struct bio_queue_head *head, struct bio *bp); +void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp); +void bioq_remove(struct bio_queue_head *head, struct bio *bp); + +int physio(struct cdev *dev, struct uio *uio, int ioflag); +#define physread physio +#define physwrite physio + +#endif /* _KERNEL */ + +#endif /* !_SYS_BIO_H_ */ |