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/* $OpenBSD: specdev.h,v 1.39 2019/12/27 22:17:01 bluhm Exp $ */
/* $NetBSD: specdev.h,v 1.12 1996/02/13 13:13:01 mycroft Exp $ */
/*
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)specdev.h 8.3 (Berkeley) 8/10/94
*/
SLIST_HEAD(vnodechain, vnode);
/*
* This structure defines the information maintained about
* special devices. It is allocated in checkalias and freed
* in vgone.
*/
struct specinfo {
struct vnodechain *si_hashchain;
SLIST_ENTRY(vnode) si_specnext;
struct mount *si_mountpoint;
dev_t si_rdev;
struct lockf_state *si_lockf;
daddr_t si_lastr;
union {
struct vnode *ci_parent; /* pointer back to parent device */
u_int8_t *ci_bitmap; /* bitmap of devices cloned off us */
} si_ci;
};
struct cloneinfo {
struct vnode *ci_vp; /* cloned vnode */
void *ci_data; /* original vnode's v_data */
};
/*
* Exported shorthand
*/
#define v_rdev v_specinfo->si_rdev
#define v_hashchain v_specinfo->si_hashchain
#define v_specnext v_specinfo->si_specnext
#define v_specmountpoint v_specinfo->si_mountpoint
#define v_speclockf v_specinfo->si_lockf
#define v_specparent v_specinfo->si_ci.ci_parent
#define v_specbitmap v_specinfo->si_ci.ci_bitmap
/*
* We use the upper 16 bits of the minor to record the clone instance.
* This gives us 8 bits for encoding the real minor number.
*/
#define CLONE_SHIFT 8
#define CLONE_MAPSZ 128
/*
* Special device management
*/
#define SPECHSZ 64
#if ((SPECHSZ&(SPECHSZ-1)) == 0)
#define SPECHASH(rdev) (((rdev>>5)+(rdev))&(SPECHSZ-1))
#else
#define SPECHASH(rdev) (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
#endif
#ifdef _KERNEL
extern struct vnodechain speclisth[SPECHSZ];
/*
* Prototypes for special file operations on vnodes.
*/
int spec_badop(void *);
int spec_getattr(void *);
int spec_setattr(void *);
int spec_access(void *);
int spec_open(void *);
int spec_close(void *);
int spec_read(void *);
int spec_write(void *);
int spec_ioctl(void *);
int spec_poll(void *);
int spec_kqfilter(void *);
int spec_fsync(void *);
int spec_inactive(void *);
int spec_strategy(void *);
int spec_print(void *);
int spec_pathconf(void *);
int spec_advlock(void *);
#endif /* _KERNEL */
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