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/* $OpenBSD: kern_bufq.c,v 1.2 2009/06/04 19:16:13 thib Exp $ */
/*
* Copyright (c) 2008, 2009 Thordur I. Bjornsson <thib@openbsd.org>
* Copyright (c) 2004 Ted Unangst <tedu@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/errno.h>
#include <sys/disklabel.h>
/* plain old disksort. */
struct buf *bufq_disksort_get(struct bufq *, int);
void bufq_disksort_add(struct bufq *, struct buf *);
int bufq_disksort_init(struct bufq *);
struct bufq *
bufq_init(int type)
{
struct bufq *bq;
int error;
KASSERT(type = BUFQ_DISKSORT);
bq = malloc(sizeof(*bq), M_DEVBUF, M_NOWAIT|M_ZERO);
if (bq == NULL)
return (NULL);
/* For now, only plain old disksort. */
bq->bufq_type = type;
bq->bufq_get = bufq_disksort_get;
bq->bufq_add = bufq_disksort_add;
error = bufq_disksort_init(bq);
if (error) {
free(bq, M_DEVBUF);
return (NULL);
}
return (bq);
}
void
bufq_destroy(struct bufq *bq)
{
bufq_drain(bq);
if (bq->bufq_data != NULL)
free(bq->bufq_data, M_DEVBUF);
free(bq, M_DEVBUF);
}
void
bufq_drain(struct bufq *bq)
{
struct buf *bp;
int s;
s = splbio();
while ((bp = BUFQ_GET(bq)) != NULL) {
bp->b_error = ENXIO;
bp->b_flags |= B_ERROR;
biodone(bp);
}
splx(s);
}
void
bufq_disksort_add(struct bufq *bq, struct buf *bp)
{
struct buf *bufq;
splassert(IPL_BIO);
bufq = (struct buf *)bq->bufq_data;
disksort(bufq, bp);
}
struct buf *
bufq_disksort_get(struct bufq *bq, int peeking)
{
struct buf *bufq, *bp;
splassert(IPL_BIO);
bufq = (struct buf *)bq->bufq_data;
bp = bufq->b_actf;
if (bp == NULL)
return (NULL);
if (!peeking)
bufq->b_actf = bp->b_actf;
return (bp);
}
int
bufq_disksort_init(struct bufq *bq)
{
int error = 0;
bq->bufq_data = malloc(sizeof(struct buf), M_DEVBUF,
M_WAITOK|M_ZERO);
if (bq->bufq_data == NULL)
error = ENOMEM;
return (error);
}
#ifdef DDB
#include <machine/db_machdep.h>
#include <ddb/db_interface.h>
#include <ddb/db_output.h>
void
db_bufq_print(struct bufq *bq, int full, int (*pr)(const char *, ...))
{
struct buf *bp, *dp;
(*pr)(" type %i\n bufq_add %p bufq_get %p bufq_data %p",
bq->bufq_type, bq->bufq_add, bq->bufq_get, bq->bufq_data);
if (full) {
printf("bufs on queue:\n");
bp = (struct buf *)bq->bufq_data;
while ((dp = bp->b_actf) != NULL) {
printf("%p\n", bp);
bp = dp;
}
}
}
#endif
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