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Annotation of sys/miscfs/specfs/specdev.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: specdev.h,v 1.20 2007/06/02 00:45:21 thib Exp $       */
                      2: /*     $NetBSD: specdev.h,v 1.12 1996/02/13 13:13:01 mycroft Exp $     */
                      3:
                      4: /*
                      5:  * Copyright (c) 1990, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)specdev.h   8.3 (Berkeley) 8/10/94
                     33:  */
                     34:
                     35: /*
                     36:  * This structure defines the information maintained about
                     37:  * special devices. It is allocated in checkalias and freed
                     38:  * in vgone.
                     39:  */
                     40: struct specinfo {
                     41:        struct  vnode **si_hashchain;
                     42:        struct  vnode *si_specnext;
                     43:        struct  mount *si_mountpoint;
                     44:        dev_t   si_rdev;
                     45:        struct  lockf *si_lockf;
                     46:        daddr64_t si_lastr;
                     47:        union {
                     48:                struct vnode *ci_parent; /* pointer back to parent device */
                     49:                u_int8_t ci_bitmap[8]; /* bitmap of devices cloned off us */
                     50:        } si_ci;
                     51: };
                     52:
                     53: struct cloneinfo {
                     54:        struct vnode *ci_vp; /* cloned vnode */
                     55:        void *ci_data; /* original vnode's v_data */
                     56: };
                     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_specmountpoint v_specinfo->si_mountpoint
                     65: #define v_speclockf v_specinfo->si_lockf
                     66: #define v_specparent v_specinfo->si_ci.ci_parent
                     67: #define v_specbitmap v_specinfo->si_ci.ci_bitmap
                     68:
                     69: /*
                     70:  * Special device management
                     71:  */
                     72: #define        SPECHSZ 64
                     73: #if    ((SPECHSZ&(SPECHSZ-1)) == 0)
                     74: #define        SPECHASH(rdev)  (((rdev>>5)+(rdev))&(SPECHSZ-1))
                     75: #else
                     76: #define        SPECHASH(rdev)  (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
                     77: #endif
                     78:
                     79: extern struct vnode *speclisth[SPECHSZ];
                     80:
                     81: /*
                     82:  * Prototypes for special file operations on vnodes.
                     83:  */
                     84: extern int (**spec_vnodeop_p)(void *);
                     85: struct nameidata;
                     86: struct componentname;
                     87: struct ucred;
                     88: struct flock;
                     89: struct buf;
                     90: struct uio;
                     91:
                     92: int    spec_badop(void *);
                     93: int    spec_ebadf(void *);
                     94:
                     95: int    spec_lookup(void *);
                     96: #define        spec_create     spec_badop
                     97: #define        spec_mknod      spec_badop
                     98: int    spec_open(void *);
                     99: int    spec_close(void *);
                    100: #define        spec_access     spec_ebadf
                    101: #define        spec_getattr    spec_ebadf
                    102: #define        spec_setattr    spec_ebadf
                    103: int    spec_read(void *);
                    104: int    spec_write(void *);
                    105: int    spec_ioctl(void *);
                    106: int    spec_poll(void *);
                    107: int    spec_kqfilter(void *);
                    108: int    spec_fsync(void *);
                    109: #define        spec_remove     spec_badop
                    110: #define        spec_link       spec_badop
                    111: #define        spec_rename     spec_badop
                    112: #define        spec_mkdir      spec_badop
                    113: #define        spec_rmdir      spec_badop
                    114: #define        spec_symlink    spec_badop
                    115: #define        spec_readdir    spec_badop
                    116: #define        spec_readlink   spec_badop
                    117: #define        spec_abortop    spec_badop
                    118: int spec_inactive(void *);
                    119: #define        spec_reclaim    nullop
                    120: #define spec_lock       vop_generic_lock
                    121: #define spec_unlock     vop_generic_unlock
                    122: #define spec_islocked   vop_generic_islocked
                    123: int    spec_bmap(void *);
                    124: int    spec_strategy(void *);
                    125: int    spec_print(void *);
                    126: int    spec_pathconf(void *);
                    127: int    spec_advlock(void *);
                    128: #define        spec_reallocblks spec_badop
                    129: #define        spec_bwrite     vop_generic_bwrite
                    130: #define spec_revoke     vop_generic_revoke
                    131:
                    132: int    spec_vnoperate(void *);
                    133:
                    134: /* spec_subr.c */
                    135: int    spec_open_clone(struct vop_open_args *);
                    136: int    spec_close_clone(struct vop_close_args *);