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specdev.h revision 1.20.2.2 
      1 /*	$NetBSD: specdev.h,v 1.20.2.2 2001/09/18 19:13:57 fvdl 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 	struct	mount *si_mountpoint;
     47 	dev_t	si_rdev;
     48 	struct	lockf *si_lockf;
     49 	void	*si_devcookie;
     50 	void	(*si_callback)(struct vnode *, int, void *);
     51 	void	*si_cbarg;
     52 };
     53 
     54 /*
     55  * Values to the int arg of the callback function. Only a call to
     56  * spec_close can lead to a callback for now.
     57  */
     58 #define VN_CB_CLOSE		1
     59 
     60 /*
     61  * Exported shorthand
     62  */
     63 #define v_rdev		v_specinfo->si_rdev
     64 #define v_hashchain	v_specinfo->si_hashchain
     65 #define v_specnext	v_specinfo->si_specnext
     66 #define v_speclockf	v_specinfo->si_lockf
     67 #define v_specmountpoint v_specinfo->si_mountpoint
     68 #define	v_devcookie	v_specinfo->si_devcookie
     69 #define v_callback	v_specinfo->si_callback
     70 #define v_cbarg		v_specinfo->si_cbarg
     71 
     72 
     73 /*
     74  * Special device management
     75  */
     76 #define	SPECHSZ	64
     77 #if	((SPECHSZ&(SPECHSZ-1)) == 0)
     78 #define	SPECHASH(rdev)	(((rdev>>5)+(rdev))&(SPECHSZ-1))
     79 #else
     80 #define	SPECHASH(rdev)	(((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
     81 #endif
     82 
     83 struct vnode *speclisth[SPECHSZ];
     84 
     85 /*
     86  * Prototypes for special file operations on vnodes.
     87  */
     88 extern	int (**spec_vnodeop_p) __P((void *));
     89 struct	nameidata;
     90 struct	componentname;
     91 struct	ucred;
     92 struct	flock;
     93 struct	buf;
     94 struct	uio;
     95 
     96 int	spec_lookup	__P((void *));
     97 #define	spec_create	genfs_badop
     98 #define	spec_mknod	genfs_badop
     99 int	spec_open	__P((void *));
    100 int	spec_close	__P((void *));
    101 #define	spec_access	genfs_ebadf
    102 #define	spec_getattr	genfs_ebadf
    103 #define	spec_setattr	genfs_ebadf
    104 int	spec_read	__P((void *));
    105 int	spec_write	__P((void *));
    106 #define	spec_lease_check genfs_nullop
    107 #define spec_fcntl	genfs_fcntl
    108 int	spec_ioctl	__P((void *));
    109 int	spec_poll	__P((void *));
    110 #define spec_revoke	genfs_revoke
    111 #define	spec_mmap	genfs_mmap
    112 int	spec_fsync	__P((void *));
    113 #define	spec_seek	genfs_nullop		/* XXX should query device */
    114 #define	spec_remove	genfs_badop
    115 #define	spec_link	genfs_badop
    116 #define	spec_rename	genfs_badop
    117 #define	spec_mkdir	genfs_badop
    118 #define	spec_rmdir	genfs_badop
    119 #define	spec_symlink	genfs_badop
    120 #define	spec_readdir	genfs_badop
    121 #define	spec_readlink	genfs_badop
    122 #define	spec_abortop	genfs_badop
    123 #define	spec_reclaim	genfs_nullop
    124 int	spec_inactive	__P((void *));
    125 #define	spec_lock	genfs_nolock
    126 #define	spec_unlock	genfs_nounlock
    127 int	spec_bmap	__P((void *));
    128 int	spec_strategy	__P((void *));
    129 int	spec_print	__P((void *));
    130 #define	spec_islocked	genfs_noislocked
    131 int	spec_pathconf	__P((void *));
    132 int	spec_advlock	__P((void *));
    133 #define	spec_blkatoff	genfs_badop
    134 #define	spec_valloc	genfs_badop
    135 #define	spec_reallocblks genfs_badop
    136 #define	spec_vfree	genfs_badop
    137 #define	spec_truncate	genfs_nullop
    138 #define	spec_update	genfs_nullop
    139 #define	spec_bwrite	vn_bwrite
    140 #define	spec_getpages	genfs_getpages
    141 #define	spec_putpages	genfs_putpages
    142 int	spec_size	__P((void *));
    143