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specdev.h revision 1.31 
      1 /*	$NetBSD: specdev.h,v 1.31 2007/07/22 19:16:06 pooka 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)specdev.h	8.6 (Berkeley) 5/21/95
     32  */
     33 #ifndef _MISCFS_SPECFS_SPECDEV_H_
     34 #define _MISCFS_SPECFS_SPECDEV_H_
     35 
     36 /*
     37  * This structure defines the information maintained about
     38  * special devices. It is allocated in checkalias and freed
     39  * in vgone.
     40  */
     41 struct spec_cow_entry {
     42 	SLIST_ENTRY(spec_cow_entry) ce_list;
     43 	int (*ce_func)(void *, struct buf *);
     44 	void *ce_cookie;
     45 };
     46 
     47 struct specinfo {
     48 	struct	vnode **si_hashchain;
     49 	struct	vnode *si_specnext;
     50 	struct	mount *si_mountpoint;
     51 	dev_t	si_rdev;
     52 	struct	lockf *si_lockf;
     53 	struct simplelock si_cow_slock;
     54 	SLIST_HEAD(, spec_cow_entry) si_cow_head;
     55 	int si_cow_req;
     56 	int si_cow_count;
     57 };
     58 /*
     59  * Exported shorthand
     60  */
     61 #define v_rdev		v_specinfo->si_rdev
     62 #define v_hashchain	v_specinfo->si_hashchain
     63 #define v_specnext	v_specinfo->si_specnext
     64 #define v_speclockf	v_specinfo->si_lockf
     65 #define v_specmountpoint v_specinfo->si_mountpoint
     66 #define v_spec_cow_slock v_specinfo->si_cow_slock
     67 #define v_spec_cow_head	v_specinfo->si_cow_head
     68 #define v_spec_cow_req	v_specinfo->si_cow_req
     69 #define v_spec_cow_count v_specinfo->si_cow_count
     70 
     71 #define SPEC_COW_LOCK(si, s) \
     72 	do { \
     73 		(s) = splbio(); \
     74 		simple_lock(&(si)->si_cow_slock) ; \
     75 	} while (/*CONSTCOND*/0)
     76 
     77 #define SPEC_COW_UNLOCK(si, s) \
     78 	do { \
     79 		simple_unlock(&(si)->si_cow_slock) ; \
     80 		splx((s)); \
     81 	} while (/*CONSTCOND*/0)
     82 
     83 /*
     84  * Special device management
     85  */
     86 #define	SPECHSZ	64
     87 #if	((SPECHSZ&(SPECHSZ-1)) == 0)
     88 #define	SPECHASH(rdev)	(((rdev>>5)+(rdev))&(SPECHSZ-1))
     89 #else
     90 #define	SPECHASH(rdev)	(((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
     91 #endif
     92 
     93 extern	struct vnode *speclisth[SPECHSZ];
     94 
     95 /*
     96  * Prototypes for special file operations on vnodes.
     97  */
     98 extern	int (**spec_vnodeop_p)(void *);
     99 struct	nameidata;
    100 struct	componentname;
    101 struct	flock;
    102 struct	buf;
    103 struct	uio;
    104 
    105 int	spec_lookup(void *);
    106 #define	spec_create	genfs_badop
    107 #define	spec_mknod	genfs_badop
    108 int	spec_open(void *);
    109 int	spec_close(void *);
    110 #define	spec_access	genfs_ebadf
    111 #define	spec_getattr	genfs_ebadf
    112 #define	spec_setattr	genfs_ebadf
    113 int	spec_read(void *);
    114 int	spec_write(void *);
    115 #define	spec_lease_check genfs_nullop
    116 #define spec_fcntl	genfs_fcntl
    117 int	spec_ioctl(void *);
    118 int	spec_poll(void *);
    119 int	spec_kqfilter(void *);
    120 #define spec_revoke	genfs_revoke
    121 int	spec_mmap(void *);
    122 int	spec_fsync(void *);
    123 #define	spec_seek	genfs_nullop		/* XXX should query device */
    124 #define	spec_remove	genfs_badop
    125 #define	spec_link	genfs_badop
    126 #define	spec_rename	genfs_badop
    127 #define	spec_mkdir	genfs_badop
    128 #define	spec_rmdir	genfs_badop
    129 #define	spec_symlink	genfs_badop
    130 #define	spec_readdir	genfs_badop
    131 #define	spec_readlink	genfs_badop
    132 #define	spec_abortop	genfs_badop
    133 #define	spec_reclaim	genfs_nullop
    134 int	spec_inactive(void *);
    135 #define	spec_lock	genfs_nolock
    136 #define	spec_unlock	genfs_nounlock
    137 int	spec_bmap(void *);
    138 int	spec_strategy(void *);
    139 int	spec_print(void *);
    140 #define	spec_islocked	genfs_noislocked
    141 int	spec_pathconf(void *);
    142 int	spec_advlock(void *);
    143 #define	spec_bwrite	vn_bwrite
    144 #define	spec_getpages	genfs_getpages
    145 #define	spec_putpages	genfs_putpages
    146 int	spec_size(void *);
    147 
    148 #endif /* _MISCFS_SPECFS_SPECDEV_H_ */
    149