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dkvar.h revision 1.15.8.2 
      1 /* $NetBSD: dkvar.h,v 1.15.8.2 2014/05/22 11:40:19 yamt 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 struct pathbuf; /* from namei.h */
     33 
     34 
     35 /* literally this is not a softc, but is intended to be included in
     36  * the pseudo-disk's softc and passed to calls in dksubr.c.  It
     37  * should include the common elements of the pseudo-disk's softc.
     38  * All elements that are included here should describe the external
     39  * representation of the disk to the higher layers, and flags that
     40  * are common to each of the pseudo-disk drivers.
     41  */
     42 struct dk_softc {
     43 	device_t		 sc_dev;
     44 	u_int32_t		 sc_flags;	/* flags */
     45 #define DK_XNAME_SIZE 8
     46 	char			 sc_xname[DK_XNAME_SIZE]; /* external name */
     47 	struct disk		 sc_dkdev;	/* generic disk info */
     48 	struct bufq_state	*sc_bufq;	/* buffer queue */
     49 };
     50 
     51 /* sc_flags:
     52  *   We separate the flags into two varieties, those that dksubr.c
     53  *   understands and manipulates and those that it does not.
     54  */
     55 
     56 #define DKF_INITED	0x00010000 /* unit has been initialised */
     57 #define DKF_WLABEL	0x00020000 /* label area is writable */
     58 #define DKF_LABELLING	0x00040000 /* unit is currently being labeled */
     59 #define DKF_WARNLABEL	0x00080000 /* warn if disklabel not present */
     60 #define DKF_LABELSANITY	0x00100000 /* warn if disklabel not sane */
     61 #define DKF_TAKEDUMP	0x00200000 /* allow dumping */
     62 
     63 /* Mask of flags that dksubr.c understands, other flags are fair game */
     64 #define DK_FLAGMASK	0xffff0000
     65 
     66 /*
     67  * This defines the interface to the routines in dksubr.c.  This
     68  * should be a single static structure per pseudo-disk driver.
     69  * We only define the functions that we currently need.
     70  */
     71 struct dk_intf {
     72 	int	  di_dtype;			/* disk type */
     73 	const char *di_dkname;			/* disk type name */
     74 	int	(*di_open)(dev_t, int, int, struct lwp *);
     75 	int	(*di_close)(dev_t, int, int, struct lwp *);
     76 	void	(*di_strategy)(struct buf *);
     77 	int	(*di_diskstart)(struct dk_softc *, struct buf *);
     78 };
     79 
     80 #define DK_BUSY(_dksc, _pmask)				\
     81 	(((_dksc)->sc_dkdev.dk_openmask & ~(_pmask)) ||	\
     82 	((_dksc)->sc_dkdev.dk_bopenmask & (_pmask)  &&	\
     83 	((_dksc)->sc_dkdev.dk_copenmask & (_pmask))))
     84 
     85 /*
     86  * Functions that are exported to the pseudo disk implementations:
     87  */
     88 
     89 void	dk_sc_init(struct dk_softc *, const char *);
     90 
     91 int	dk_open(struct dk_intf *, struct dk_softc *, dev_t,
     92 		int, int, struct lwp *);
     93 int	dk_close(struct dk_intf *, struct dk_softc *, dev_t,
     94 		 int, int, struct lwp *);
     95 void	dk_strategy(struct dk_intf *, struct dk_softc *, struct buf *);
     96 void	dk_start(struct dk_intf *, struct dk_softc *);
     97 void	dk_iodone(struct dk_intf *, struct dk_softc *);
     98 int	dk_size(struct dk_intf *, struct dk_softc *, dev_t);
     99 int	dk_ioctl(struct dk_intf *, struct dk_softc *, dev_t,
    100 		 u_long, void *, int, struct lwp *);
    101 int	dk_dump(struct dk_intf *, struct dk_softc *, dev_t,
    102 		daddr_t, void *, size_t);
    103 void	dk_getdisklabel(struct dk_intf *, struct dk_softc *, dev_t);
    104 void	dk_getdefaultlabel(struct dk_intf *, struct dk_softc *,
    105 			   struct disklabel *);
    106 
    107 int	dk_lookup(struct pathbuf *, struct lwp *, struct vnode **);
    108