mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-24 01:03:19 +00:00
2906da29dc
This allows writing to DVD-RAM, PD and similar drives that probe as CD devices. Note that these are randomly writeable devices, not sequential-only devices like CD-R drives, which are supported by cdrecord. Add a new flag value for dsopen(), DSO_COMPATLABEL. The cd(4) driver now uses this flag instead of the DSO_NOLABELS flag. The DSO_NOLABELS always used a "fake" disklabel for the entire disk, provided by the caller. With the DSO_COMPATLABEL flag, dsopen() will first search the media for a label, and if it finds a label, it will use that label. Otherwise it will use the fake disklabel provided by the caller. This provides backwards compatibility, since we will still have labels for ISO9660 media. It also provides new functionality, since you can now have a regular BSD disklabel on read-only media, or on writeable media (e.g. DVD-RAM). Bruce and I both think that we should eventually (in a few years) get away from using disklabels for ISO9660 media, and just use the whole disk device (/dev/cd0). At that point disklabel handling in the cd(4) driver could follow the "normal" model, as used in the da(4) driver. Also, clean up the path in a couple of places in cdregister(). (Thanks to Nick Hibma for catching that bug.) Reviewed by: bde
99 lines
3.5 KiB
C
99 lines
3.5 KiB
C
/*-
|
|
* Copyright (c) 1994 Bruce D. Evans.
|
|
* 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 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _SYS_DISKSLICE_H_
|
|
#define _SYS_DISKSLICE_H_
|
|
|
|
#ifndef _KERNEL
|
|
#include <sys/types.h>
|
|
#endif
|
|
#include <sys/ioccom.h>
|
|
|
|
#define BASE_SLICE 2
|
|
#define COMPATIBILITY_SLICE 0
|
|
#define DIOCGSLICEINFO _IOR('d', 111, struct diskslices)
|
|
#define DIOCSYNCSLICEINFO _IOW('d', 112, int)
|
|
#define MAX_SLICES 32
|
|
#define WHOLE_DISK_SLICE 1
|
|
|
|
struct diskslice {
|
|
u_long ds_offset; /* starting sector */
|
|
u_long ds_size; /* number of sectors */
|
|
int ds_type; /* (foreign) slice type */
|
|
#ifdef PC98
|
|
int ds_subtype; /* sub slice type */
|
|
u_char ds_name[16]; /* slice name */
|
|
#endif
|
|
struct disklabel *ds_label; /* BSD label, if any */
|
|
u_char ds_openmask; /* devs open */
|
|
u_char ds_wlabel; /* nonzero if label is writable */
|
|
};
|
|
|
|
struct diskslices {
|
|
struct cdevsw *dss_cdevsw; /* for containing device */
|
|
int dss_first_bsd_slice; /* COMPATIBILITY_SLICE is mapped here */
|
|
u_int dss_nslices; /* actual dimension of dss_slices[] */
|
|
u_int dss_oflags; /* copy of flags for "first" open */
|
|
int dss_secmult; /* block to sector multiplier */
|
|
int dss_secshift; /* block to sector shift (or -1) */
|
|
int dss_secsize; /* sector size */
|
|
struct diskslice
|
|
dss_slices[MAX_SLICES]; /* actually usually less */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
|
|
/* Flags for dsopen(). */
|
|
#define DSO_NOLABELS 1
|
|
#define DSO_ONESLICE 2
|
|
#define DSO_COMPATLABEL 4
|
|
|
|
#define dsgetlabel(dev, ssp) (ssp->dss_slices[dkslice(dev)].ds_label)
|
|
|
|
struct bio;
|
|
struct disklabel;
|
|
|
|
int dscheck __P((struct bio *bp, struct diskslices *ssp));
|
|
void dsclose __P((dev_t dev, int mode, struct diskslices *ssp));
|
|
void dsgone __P((struct diskslices **sspp));
|
|
int dsinit __P((dev_t dev, struct disklabel *lp,
|
|
struct diskslices **sspp));
|
|
int dsioctl __P((dev_t dev, u_long cmd, caddr_t data,
|
|
int flags, struct diskslices **sspp));
|
|
int dsisopen __P((struct diskslices *ssp));
|
|
struct diskslices *dsmakeslicestruct __P((int nslices, struct disklabel *lp));
|
|
char *dsname __P((dev_t dev, int unit, int slice, int part,
|
|
char *partname));
|
|
int dsopen __P((dev_t dev, int mode, u_int flags,
|
|
struct diskslices **sspp, struct disklabel *lp));
|
|
int dssize __P((dev_t dev, struct diskslices **sspp));
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_SYS_DISKSLICE_H_ */
|