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specdev.h revision 1.17.20.1 
      1 /*	$NetBSD: specdev.h,v 1.17.20.1 1999/12/21 23:20:01 wrstuden Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)specdev.h	8.6 (Berkeley) 5/21/95
     36  */
     37 
     38 /*
     39  * This structure defines the information maintained about
     40  * special devices. It is allocated in checkalias and freed
     41  * in vgone.
     42  */
     43 struct specinfo {
     44 	struct	vnode **si_hashchain;
     45 	struct	vnode *si_specnext;
     46 	long	si_flags;
     47 	dev_t	si_rdev;
     48 	struct	lockf *si_lockf;
     49 	int	si_bshift;	/* for disk devices, block shift value */
     50 				/* valid after device opened */
     51 };
     52 /*
     53  * Exported shorthand
     54  */
     55 #define v_rdev		v_specinfo->si_rdev
     56 #define v_hashchain	v_specinfo->si_hashchain
     57 #define v_specnext	v_specinfo->si_specnext
     58 #define v_specflags	v_specinfo->si_flags
     59 #define v_speclockf	v_specinfo->si_lockf
     60 #define v_specbshift	v_specinfo->si_bshift
     61 
     62 /*
     63  * Flags for specinfo
     64  */
     65 #define	SI_MOUNTEDON	0x0001	/* block special device is mounted on */
     66 
     67 /*
     68  * Special device management
     69  */
     70 #define	SPECHSZ	64
     71 #if	((SPECHSZ&(SPECHSZ-1)) == 0)
     72 #define	SPECHASH(rdev)	(((rdev>>5)+(rdev))&(SPECHSZ-1))
     73 #else
     74 #define	SPECHASH(rdev)	(((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
     75 #endif
     76 
     77 struct vnode *speclisth[SPECHSZ];
     78 
     79 /*
     80  * Prototypes for special file operations on vnodes.
     81  */
     82 extern	int (**spec_vnodeop_p) __P((void *));
     83 struct	nameidata;
     84 struct	componentname;
     85 struct	ucred;
     86 struct	flock;
     87 struct	buf;
     88 struct	uio;
     89 
     90 int	spec_lookup	__P((void *));
     91 #define	spec_create	genfs_badop
     92 #define	spec_mknod	genfs_badop
     93 int	spec_open	__P((void *));
     94 int	spec_close	__P((void *));
     95 #define	spec_access	genfs_ebadf
     96 #define	spec_getattr	genfs_ebadf
     97 #define	spec_setattr	genfs_ebadf
     98 int	spec_read	__P((void *));
     99 int	spec_write	__P((void *));
    100 #define	spec_lease_check genfs_nullop
    101 int	spec_ioctl	__P((void *));
    102 int	spec_poll	__P((void *));
    103 #define spec_revoke	genfs_revoke
    104 #define	spec_mmap	genfs_badop
    105 int	spec_fsync	__P((void *));
    106 #define	spec_seek	genfs_nullop		/* XXX should query device */
    107 #define	spec_remove	genfs_badop
    108 #define	spec_link	genfs_badop
    109 #define	spec_rename	genfs_badop
    110 #define	spec_mkdir	genfs_badop
    111 #define	spec_rmdir	genfs_badop
    112 #define	spec_symlink	genfs_badop
    113 #define	spec_readdir	genfs_badop
    114 #define	spec_readlink	genfs_badop
    115 #define	spec_abortop	genfs_badop
    116 #define	spec_reclaim	genfs_nullop
    117 int	spec_inactive	__P((void *));
    118 #define	spec_lock	genfs_nolock
    119 #define	spec_unlock	genfs_nounlock
    120 int	spec_bmap	__P((void *));
    121 int	spec_strategy	__P((void *));
    122 int	spec_print	__P((void *));
    123 #define	spec_islocked	genfs_noislocked
    124 int	spec_pathconf	__P((void *));
    125 int	spec_advlock	__P((void *));
    126 #define	spec_blkatoff	genfs_badop
    127 #define	spec_valloc	genfs_badop
    128 #define	spec_reallocblks genfs_badop
    129 #define	spec_vfree	genfs_badop
    130 #define	spec_truncate	genfs_nullop
    131 #define	spec_update	genfs_nullop
    132 #define	spec_bwrite	vn_bwrite
    133