NetBSD/sys/dev/dkvar.h

118 lines
4.6 KiB
C

/* $NetBSD: dkvar.h,v 1.15 2010/11/19 06:44:39 dholland Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Roland C. Dowdeswell.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
struct pathbuf; /* from namei.h */
struct dk_geom {
u_int32_t pdg_secsize;
u_int32_t pdg_nsectors;
u_int32_t pdg_ntracks;
u_int32_t pdg_ncylinders;
};
/* literally this is not a softc, but is intended to be included in
* the pseudo-disk's softc and passed to calls in dksubr.c. It
* should include the common elements of the pseudo-disk's softc.
* All elements that are included here should describe the external
* representation of the disk to the higher layers, and flags that
* are common to each of the pseudo-disk drivers.
*/
struct dk_softc {
void *sc_osc; /* the softc of the underlying
* driver */
u_int32_t sc_flags; /* flags */
size_t sc_size; /* size of disk */
struct dk_geom sc_geom; /* geometry info */
#define DK_XNAME_SIZE 8
char sc_xname[DK_XNAME_SIZE]; /* external name */
struct disk sc_dkdev; /* generic disk info */
struct bufq_state *sc_bufq; /* buffer queue */
};
/* sc_flags:
* We separate the flags into two varieties, those that dksubr.c
* understands and manipulates and those that it does not.
*/
#define DKF_INITED 0x00010000 /* unit has been initialised */
#define DKF_WLABEL 0x00020000 /* label area is writable */
#define DKF_LABELLING 0x00040000 /* unit is currently being labeled */
#define DKF_WARNLABEL 0x00080000 /* warn if disklabel not present */
#define DKF_LABELSANITY 0x00100000 /* warn if disklabel not sane */
#define DKF_TAKEDUMP 0x00200000 /* allow dumping */
/* Mask of flags that dksubr.c understands, other flags are fair game */
#define DK_FLAGMASK 0xffff0000
/*
* This defines the interface to the routines in dksubr.c. This
* should be a single static structure per pseudo-disk driver.
* We only define the functions that we currently need.
*/
struct dk_intf {
int di_dtype; /* disk type */
const char *di_dkname; /* disk type name */
int (*di_open)(dev_t, int, int, struct lwp *);
int (*di_close)(dev_t, int, int, struct lwp *);
void (*di_strategy)(struct buf *);
int (*di_diskstart)(struct dk_softc *, struct buf *);
};
#define DK_BUSY(_dksc, _pmask) \
(((_dksc)->sc_dkdev.dk_openmask & ~(_pmask)) || \
((_dksc)->sc_dkdev.dk_bopenmask & (_pmask) && \
((_dksc)->sc_dkdev.dk_copenmask & (_pmask))))
/*
* Functions that are exported to the pseudo disk implementations:
*/
void dk_sc_init(struct dk_softc *, void *, const char *);
int dk_open(struct dk_intf *, struct dk_softc *, dev_t,
int, int, struct lwp *);
int dk_close(struct dk_intf *, struct dk_softc *, dev_t,
int, int, struct lwp *);
void dk_strategy(struct dk_intf *, struct dk_softc *, struct buf *);
void dk_start(struct dk_intf *, struct dk_softc *);
void dk_iodone(struct dk_intf *, struct dk_softc *);
int dk_size(struct dk_intf *, struct dk_softc *, dev_t);
int dk_ioctl(struct dk_intf *, struct dk_softc *, dev_t,
u_long, void *, int, struct lwp *);
int dk_dump(struct dk_intf *, struct dk_softc *, dev_t,
daddr_t, void *, size_t);
void dk_getdisklabel(struct dk_intf *, struct dk_softc *, dev_t);
void dk_getdefaultlabel(struct dk_intf *, struct dk_softc *,
struct disklabel *);
int dk_lookup(struct pathbuf *, struct lwp *, struct vnode **);