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/* $OpenBSD: bio.c,v 1.11 2007/12/23 17:09:49 deraadt Exp $ */
/*
* Copyright (c) 2002 Niklas Hallqvist. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/* A device controller ioctl tunnelling device. */
#include <sys/param.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <dev/biovar.h>
struct bio_mapping {
LIST_ENTRY(bio_mapping) bm_link;
struct device *bm_dev;
int (*bm_ioctl)(struct device *, u_long, caddr_t);
};
LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios);
void bioattach(int);
int bioclose(dev_t, int, int, struct proc *);
int bioioctl(dev_t, u_long, caddr_t, int, struct proc *);
int bioopen(dev_t, int, int, struct proc *);
int bio_delegate_ioctl(struct bio_mapping *, u_long, caddr_t);
struct bio_mapping *bio_lookup(char *);
int bio_validate(void *);
void
bioattach(int nunits)
{
}
int
bioopen(dev_t dev, int flags, int mode, struct proc *p)
{
return (0);
}
int
bioclose(dev_t dev, int flags, int mode, struct proc *p)
{
return (0);
}
int
bioioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
{
struct bio_locate *locate;
struct bio_common *common;
char name[16];
int error;
switch (cmd) {
case BIOCLOCATE:
locate = (struct bio_locate *)addr;
error = copyinstr(locate->bl_name, name, sizeof name, NULL);
if (error != 0)
return (error);
locate->bl_cookie = bio_lookup(name);
if (locate->bl_cookie == NULL)
return (ENOENT);
break;
default:
common = (struct bio_common *)addr;
if (!bio_validate(common->bc_cookie))
return (ENOENT);
return (bio_delegate_ioctl(
(struct bio_mapping *)common->bc_cookie, cmd, addr));
}
return (0);
}
int
bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, caddr_t))
{
struct bio_mapping *bm;
bm = malloc(sizeof *bm, M_DEVBUF, M_NOWAIT);
if (bm == NULL)
return (ENOMEM);
bm->bm_dev = dev;
bm->bm_ioctl = ioctl;
LIST_INSERT_HEAD(&bios, bm, bm_link);
return (0);
}
void
bio_unregister(struct device *dev)
{
struct bio_mapping *bm, *next;
for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) {
next = LIST_NEXT(bm, bm_link);
if (dev == bm->bm_dev) {
LIST_REMOVE(bm, bm_link);
free(bm, M_DEVBUF);
}
}
}
struct bio_mapping *
bio_lookup(char *name)
{
struct bio_mapping *bm;
LIST_FOREACH(bm, &bios, bm_link)
if (strcmp(name, bm->bm_dev->dv_xname) == 0)
return (bm);
return (NULL);
}
int
bio_validate(void *cookie)
{
struct bio_mapping *bm;
LIST_FOREACH(bm, &bios, bm_link)
if (bm == cookie)
return (1);
return (0);
}
int
bio_delegate_ioctl(struct bio_mapping *bm, u_long cmd, caddr_t addr)
{
return (bm->bm_ioctl(bm->bm_dev, cmd, addr));
}
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