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/*-
* 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 */
#define BIO_SPEEDUP 0x0a /* Upper layers face shortage */
/* 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
#define BIO_SWAP 0x200 /* Swap-related I/O */
#define PRINT_BIO_FLAGS "\20\12swap\7vlist\6transient_mapping\5unmapped" \
"\4ordered\3onqueue\2done\1error"
#define BIO_SPEEDUP_WRITE 0x4000 /* Resource shortage at upper layers */
#define BIO_SPEEDUP_TRIM 0x8000 /* Resource shortage at upper layers */
#ifdef _KERNEL
struct disk;
struct bio;
struct vm_map;
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_spare1;
void *bio_spare2;
#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_ */
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