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dkvar.h revision 1.11 
      1 /* $NetBSD: dkvar.h,v 1.11 2007/06/26 15:22:24 cube Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Roland C. Dowdeswell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 struct dk_geom {
     40 	u_int32_t	pdg_secsize;
     41 	u_int32_t	pdg_nsectors;
     42 	u_int32_t	pdg_ntracks;
     43 	u_int32_t	pdg_ncylinders;
     44 };
     45 
     46 /* literally this is not a softc, but is intended to be included in
     47  * the pseudo-disk's softc and passed to calls in dksubr.c.  It
     48  * should include the common elements of the pseudo-disk's softc.
     49  * All elements that are included here should describe the external
     50  * representation of the disk to the higher layers, and flags that
     51  * are common to each of the pseudo-disk drivers.
     52  */
     53 struct dk_softc {
     54 	void			*sc_osc;	/* the softc of the underlying
     55 						 * driver */
     56 	u_int32_t		 sc_flags;	/* flags */
     57 	size_t			 sc_size;	/* size of disk */
     58 	struct dk_geom		 sc_geom;	/* geometry info */
     59 #define DK_XNAME_SIZE 8
     60 	char			 sc_xname[DK_XNAME_SIZE]; /* external name */
     61 	struct disk		 sc_dkdev;	/* generic disk info */
     62 	struct bufq_state	*sc_bufq;	/* buffer queue */
     63 };
     64 
     65 /* sc_flags:
     66  *   We separate the flags into two varieties, those that dksubr.c
     67  *   understands and manipulates and those that it does not.
     68  */
     69 
     70 #define DKF_INITED	0x00010000 /* unit has been initialised */
     71 #define DKF_WLABEL	0x00020000 /* label area is writable */
     72 #define DKF_LABELLING	0x00040000 /* unit is currently being labeled */
     73 #define DKF_WARNLABEL	0x00080000 /* warn if disklabel not present */
     74 #define DKF_LABELSANITY	0x00100000 /* warn if disklabel not sane */
     75 #define DKF_TAKEDUMP	0x00200000 /* allow dumping */
     76 
     77 /* Mask of flags that dksubr.c understands, other flags are fair game */
     78 #define DK_FLAGMASK	0xffff0000
     79 
     80 /*
     81  * This defines the interface to the routines in dksubr.c.  This
     82  * should be a single static structure per pseudo-disk driver.
     83  * We only define the functions that we currently need.
     84  */
     85 struct dk_intf {
     86 	int	  di_dtype;			/* disk type */
     87 	const char *di_dkname;			/* disk type name */
     88 	int	(*di_open)(dev_t, int, int, struct lwp *);
     89 	int	(*di_close)(dev_t, int, int, struct lwp *);
     90 	void	(*di_strategy)(struct buf *);
     91 	int	(*di_diskstart)(struct dk_softc *, struct buf *);
     92 };
     93 
     94 #define DK_BUSY(_dksc, _pmask)				\
     95 	((_dksc)->sc_dkdev.dk_openmask & ~(_pmask)) ||	\
     96 	((_dksc)->sc_dkdev.dk_bopenmask & (_pmask)  &&	\
     97 	((_dksc)->sc_dkdev.dk_copenmask & (_pmask)))
     98 
     99 /*
    100  * Functions that are exported to the pseudo disk implementations:
    101  */
    102 
    103 void	dk_sc_init(struct dk_softc *, void *, char *);
    104 
    105 int	dk_open(struct dk_intf *, struct dk_softc *, dev_t,
    106 		int, int, struct lwp *);
    107 int	dk_close(struct dk_intf *, struct dk_softc *, dev_t,
    108 		 int, int, struct lwp *);
    109 void	dk_strategy(struct dk_intf *, struct dk_softc *, struct buf *);
    110 void	dk_start(struct dk_intf *, struct dk_softc *);
    111 void	dk_iodone(struct dk_intf *, struct dk_softc *);
    112 int	dk_size(struct dk_intf *, struct dk_softc *, dev_t);
    113 int	dk_ioctl(struct dk_intf *, struct dk_softc *, dev_t,
    114 		 u_long, void *, int, struct lwp *);
    115 int	dk_dump(struct dk_intf *, struct dk_softc *, dev_t,
    116 		daddr_t, void *, size_t);
    117 void	dk_getdisklabel(struct dk_intf *, struct dk_softc *, dev_t);
    118 void	dk_getdefaultlabel(struct dk_intf *, struct dk_softc *,
    119 			   struct disklabel *);
    120 
    121 int	dk_lookup(const char *, struct lwp *, struct vnode **, enum uio_seg);
    122