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freebsd/sbin/mount_cd9660/mount_cd9660.c
Joerg Wunsch d6ef03d3fa Userland part of ISO9660 multi-session support. mount_cd9660(8) will
now by default mount the last data track (thus last session), as
opposed to the very first session it has been mounting previously.
This is consistent with the ISO9660 multi-session idea, and the way
other operating systems are working.

There's support to mount arbitrary sessions using the -s option.  This
way, you can simulate multi-session CDs on something like vn devices
that don't support CDIO* ioctl commands.  You can also force the
historic behaviour with

	mount -t cd9660 -o -s=0 /dev/cd0a /cdrom
1997-04-29 15:56:40 +00:00

221 lines
5.9 KiB
C

/*
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley
* by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
* Support code is derived from software contributed to Berkeley
* by Atsushi Murai (amurai@spec.co.jp).
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)mount_cd9660.c 8.7 (Berkeley) 5/1/95
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1992, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*
static char sccsid[] = "@(#)mount_cd9660.c 8.7 (Berkeley) 5/1/95";
*/
static const char rcsid[] =
"$Id: mount_cd9660.c,v 1.11 1997/03/29 03:32:35 imp Exp $";
#endif /* not lint */
#include <sys/cdio.h>
#include <sys/file.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/../isofs/cd9660/cd9660_mount.h>
#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "mntopts.h"
struct mntopt mopts[] = {
MOPT_STDOPTS,
MOPT_UPDATE,
{ "extatt", 0, ISOFSMNT_EXTATT, 1 },
{ "gens", 0, ISOFSMNT_GENS, 1 },
{ "rrip", 1, ISOFSMNT_NORRIP, 1 },
{ NULL }
};
int get_ssector(const char *dev);
void usage(void);
int
main(int argc, char **argv)
{
struct iso_args args;
int ch, mntflags, opts;
char *dev, *dir;
struct vfsconf vfc;
int error, verbose;
mntflags = opts = verbose = 0;
memset(&args, 0, sizeof args);
args.ssector = -1;
while ((ch = getopt(argc, argv, "ego:rs:v")) != -1)
switch (ch) {
case 'e':
opts |= ISOFSMNT_EXTATT;
break;
case 'g':
opts |= ISOFSMNT_GENS;
break;
case 'o':
getmntopts(optarg, mopts, &mntflags, &opts);
break;
case 'r':
opts |= ISOFSMNT_NORRIP;
break;
case 's':
args.ssector = atoi(optarg);
break;
case 'v':
verbose++;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 2)
usage();
dev = argv[0];
dir = argv[1];
#define DEFAULT_ROOTUID -2
/*
* ISO 9660 filesystems are not writeable.
*/
mntflags |= MNT_RDONLY;
args.export.ex_flags = MNT_EXRDONLY;
args.fspec = dev;
args.export.ex_root = DEFAULT_ROOTUID;
args.flags = opts;
if (args.ssector == -1) {
/*
* The start of the session has not been specified on
* the command line. If we can successfully read the
* TOC of a CD-ROM, use the last data track we find.
* Otherwise, just use 0, in order to mount the very
* first session. This is compatible with the
* historic behaviour of mount_cd9660(8). If the user
* has specified -s <ssector> above, we don't get here
* and leave the user's will.
*/
if ((args.ssector = get_ssector(dev)) == -1) {
if (verbose)
printf("could not determine starting sector, "
"using very first session\n");
args.ssector = 0;
} else if (verbose)
printf("using starting sector %d\n", args.ssector);
}
error = getvfsbyname("cd9660", &vfc);
if (error && vfsisloadable("cd9660")) {
if (vfsload("cd9660"))
err(EX_OSERR, "vfsload(cd9660)");
endvfsent(); /* flush cache */
error = getvfsbyname("cd9660", &vfc);
}
if (error)
errx(1, "cd9660 filesystem is not available");
if (mount(vfc.vfc_name, dir, mntflags, &args) < 0)
err(1, NULL);
exit(0);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: mount_cd9660 [-egrv] [-o options] [-s startsector] special node\n");
exit(EX_USAGE);
}
int
get_ssector(const char *dev)
{
struct ioc_toc_header h;
struct ioc_read_toc_entry t;
struct cd_toc_entry toc_buffer[100];
int fd, ntocentries, i;
if ((fd = open(dev, O_RDONLY)) == -1)
return -1;
if (ioctl(fd, CDIOREADTOCHEADER, &h) == -1) {
close(fd);
return -1;
}
ntocentries = h.ending_track - h.starting_track + 1;
if (ntocentries > 100) {
/* unreasonable, only 100 allowed */
close(fd);
return -1;
}
t.address_format = CD_LBA_FORMAT;
t.starting_track = 0;
t.data_len = ntocentries * sizeof(struct cd_toc_entry);
t.data = toc_buffer;
if (ioctl(fd, CDIOREADTOCENTRYS, (char *) &t) == -1) {
close(fd);
return -1;
}
close(fd);
for (i = ntocentries - 1; i >= 0; i--)
if ((toc_buffer[i].control & 4) != 0)
/* found a data track */
break;
if (i < 0)
return -1;
return ntohl(toc_buffer[i].addr.lba);
}