112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/* $OpenBSD: specdev.h,v 1.41 2022/06/26 05:20:42 visa Exp $ */
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/* $NetBSD: specdev.h,v 1.12 1996/02/13 13:13:01 mycroft Exp $ */
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)specdev.h 8.3 (Berkeley) 8/10/94
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*/
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SLIST_HEAD(vnodechain, vnode);
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/*
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* This structure defines the information maintained about
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* special devices. It is allocated in checkalias and freed
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* in vgone.
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*/
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struct specinfo {
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struct vnodechain *si_hashchain;
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SLIST_ENTRY(vnode) si_specnext;
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struct mount *si_mountpoint;
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dev_t si_rdev;
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struct lockf_state *si_lockf;
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daddr_t si_lastr;
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union {
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struct vnode *ci_parent; /* pointer back to parent device */
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u_int8_t *ci_bitmap; /* bitmap of devices cloned off us */
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} si_ci;
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};
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struct cloneinfo {
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struct vnode *ci_vp; /* cloned vnode */
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void *ci_data; /* original vnode's v_data */
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};
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/*
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* Exported shorthand
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*/
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#define v_rdev v_specinfo->si_rdev
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#define v_hashchain v_specinfo->si_hashchain
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#define v_specnext v_specinfo->si_specnext
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#define v_specmountpoint v_specinfo->si_mountpoint
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#define v_speclockf v_specinfo->si_lockf
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#define v_specparent v_specinfo->si_ci.ci_parent
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#define v_specbitmap v_specinfo->si_ci.ci_bitmap
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/*
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* We use the upper 16 bits of the minor to record the clone instance.
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* This gives us 8 bits for encoding the real minor number.
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*/
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#define CLONE_SHIFT 8
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#define CLONE_MAPSZ 128
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/*
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* Special device management
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*/
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#define SPECHSZ 64
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#if ((SPECHSZ&(SPECHSZ-1)) == 0)
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#define SPECHASH(rdev) (((rdev>>5)+(rdev))&(SPECHSZ-1))
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#else
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#define SPECHASH(rdev) (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
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#endif
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#ifdef _KERNEL
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extern struct vnodechain speclisth[SPECHSZ];
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/*
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* Prototypes for special file operations on vnodes.
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*/
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int spec_getattr(void *);
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int spec_setattr(void *);
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int spec_access(void *);
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int spec_open(void *);
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int spec_close(void *);
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int spec_read(void *);
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int spec_write(void *);
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int spec_ioctl(void *);
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int spec_kqfilter(void *);
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int spec_fsync(void *);
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int spec_inactive(void *);
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int spec_strategy(void *);
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int spec_print(void *);
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int spec_pathconf(void *);
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int spec_advlock(void *);
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#endif /* _KERNEL */
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