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This code will be turned on with the TWO options DEVFS and SLICE. (see LINT) Two labels PRE_DEVFS_SLICE and POST_DEVFS_SLICE will deliniate these changes. /dev will be automatically mounted by init (thanks phk) on bootup. See /sys/dev/slice/slice.4 for more info. All code should act the same without these options enabled. Mike Smith, Poul Henning Kamp, Soeren, and a few dozen others This code does not support the following: bad144 handling. Persistance. (My head is still hurting from the last time we discussed this) ATAPI flopies are not handled by the SLICE code yet. When this code is running, all major numbers are arbitrary and COULD be dynamically assigned. (this is not done, for POLA only) Minor numbers for disk slices ARE arbitray and dynamically assigned.
82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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 8.6 (Berkeley) 5/21/95
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* $Id: specdev.h,v 1.14 1998/03/08 09:57:40 julian Exp $
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*/
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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 vnode **si_hashchain;
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struct vnode *si_specnext;
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struct mount *si_mountpoint;
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dev_t si_rdev;
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unsigned long si_blksize; /* smallest IO unit */
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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_blksize v_specinfo->si_blksize
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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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extern struct vnode *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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extern vop_t **spec_vnodeop_p;
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struct nameidata;
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struct componentname;
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struct ucred;
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struct flock;
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struct buf;
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struct uio;
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int spec_vnoperate __P((struct vop_generic_args *));
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