* Copyright (c) 1996-1998 Michael Shalayeff

/* $NetBSD: unixdev.c,v 1.4 2013/11/04 21:59:15 christos Exp $ */
/* $OpenBSD: unixdev.c,v 1.6 2007/06/16 00:26:33 deraadt Exp $ */

/*
* Copyright (c) 1996-1998 Michael Shalayeff
* 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 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.
*
*/

#include <sys/param.h>
#include <sys/reboot.h>

#include "boot.h"
#include "bootinfo.h"
#include "disk.h"
#include "unixdev.h"
#include "compat_linux.h"

static struct btinfo_bootdisk bi_disk;

int
unixstrategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf,
size_t *rsize)
{
off_t off;
int fd = (int)devdata;
int rc = 0;

#ifdef UNIX_DEBUG
printf("unixstrategy: %s %d bytes @ %d\n",
((rw == F_READ) ? "reading" : "writing"), (int)size, (int)blk);
#endif

off = (off_t)blk * DEV_BSIZE;
if ((rc = ulseek(fd, off, SEEK_SET)) >= 0)
rc = (rw == F_READ) ? uread(fd, buf, size) :
uwrite(fd, buf, size);

if (rc >= 0) {
*rsize = (size_t)rc;
rc = 0;
} else
rc = errno;
return rc;
}

int
unixopen(struct open_file *f, ...)
{
va_list ap;
char path[PATH_MAX];
struct diskinfo *dip;
char *devname;
const char *fname;
u_int unit, partition;
int dospart;

va_start(ap, f);
devname = va_arg(ap, char *);
unit = va_arg(ap, u_int);
partition = va_arg(ap, u_int);
fname = va_arg(ap, char *);
va_end(ap);

#ifdef UNIX_DEBUG
printf("%s: devname=%s, unit=%d, partition=%d, fname=%s\n",
__func__, devname, unit, partition, fname);
#else
__USE(fname);
#endif

f->f_devdata = NULL;

/* Find device. */
dip = dkdevice(devname, unit);
if (dip == NULL)
return ENOENT;

/* Try for disklabel again (might be removable media). */
if (dip->bios_info.flags & BDI_BADLABEL) {
const char *st = bios_getdisklabel(&dip->bios_info,
&dip->disklabel);
#ifdef UNIX_DEBUG
if (debug && st)
printf("%s\n", st);
#endif
if (!st) {
dip->bios_info.flags &= ~BDI_BADLABEL;
dip->bios_info.flags |= BDI_GOODLABEL;
} else
return ERDLAB;
}

dospart = bios_getdospart(&dip->bios_info);
bios_devpath(dip->bios_info.bios_number, dospart, path);
f->f_devdata = (void *)uopen(path, LINUX_O_RDONLY);
if ((int)f->f_devdata == -1)
return errno;

bi_disk.biosdev = dip->bios_info.bios_number;
bi_disk.partition = partition;
bi_disk.labelsector =
dip->disklabel.d_partitions[partition].p_offset + LABELSECTOR;
bi_disk.label.type = dip->disklabel.d_type;
memcpy(bi_disk.label.packname, dip->disklabel.d_packname, 16);
bi_disk.label.checksum = dip->disklabel.d_checksum;
BI_ADD(&bi_disk, BTINFO_BOOTDISK, sizeof(bi_disk));

return 0;
}

int
unixpathopen(struct open_file *f, ...)
{
va_list ap;
char *devname;
const char *fname;
u_int unit, partition;

va_start(ap, f);
devname = va_arg(ap, char *);
unit = va_arg(ap, u_int);
partition = va_arg(ap, u_int);
fname = va_arg(ap, char *);
va_end(ap);

#ifdef UNIX_DEBUG
printf("%s: devname=%s, unit=%d, partition=%d, fname=%s\n",
__func__, devname, unit, partition, fname);
#else
__USE(devname); __USE(partition); __USE(unit);
#endif

if (fname == NULL || fname[0] == '\0')
return EINVAL;

f->f_devdata = (void *)uopen(fname, LINUX_O_RDONLY);
if ((int)f->f_devdata == -1)
return errno;

bi_del(BTINFO_BOOTDISK);

return 0;
}

int
unixclose(struct open_file *f)
{

#ifdef UNIX_DEBUG
printf("%s\n", __func__);
#endif

return uclose((int)f->f_devdata);
}

int
unixioctl(struct open_file *f, u_long cmd, void *data)
{

#ifdef UNIX_DEBUG
printf("%s: cmd=0x%08lx\n", __func__, cmd);
#endif

return uioctl((int)f->f_devdata, cmd, data);
}

off_t
ulseek(int fd, off_t off, int wh)
{
extern long ulseek32(int, long, int);
off_t r;

/* XXX only SEEK_SET is used, so anything else can fail for now. */

if (wh == SEEK_SET) {
if (ulseek32(fd, 0, SEEK_SET) != 0)
return -1;
while (off > OFFT_OFFSET_MAX) {
off -= OFFT_OFFSET_MAX;
if (ulseek32(fd, OFFT_OFFSET_MAX, SEEK_CUR) < 0 &&
errno != LINUX_EOVERFLOW)
return -1;
}
r = ulseek32(fd, (long)off, SEEK_CUR);
if (r == -1 && errno == LINUX_EOVERFLOW)
r = off;
} else
r = ulseek32(fd, (long)off, wh);

return r;
}