sys/miscfs/specfs/specdev.h

   1 /*      $NetBSD: specdev.h,v 1.38 2009/10/06 04:28:11 elad Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
   5  * 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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /*
  30  * Copyright (c) 1990, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      @(#)specdev.h   8.6 (Berkeley) 5/21/95
  58  */
  59
  60 #ifndef _MISCFS_SPECFS_SPECDEV_H_
  61 #define _MISCFS_SPECFS_SPECDEV_H_
  62
  63 #include <sys/mutex.h>
  64 #include <sys/vnode.h>
  65
  66 typedef struct specnode {
  67         vnode_t         *sn_next;
  68         struct specdev  *sn_dev;
  69         u_int           sn_opencnt;
  70         dev_t           sn_rdev;
  71         bool            sn_gone;
  72 } specnode_t;
  73
  74 typedef struct specdev {
  75         struct mount    *sd_mountpoint;
  76         struct lockf    *sd_lockf;
  77         vnode_t         *sd_bdevvp;
  78         u_int           sd_opencnt;
  79         u_int           sd_refcnt;
  80         dev_t           sd_rdev;
  81 } specdev_t;
  82
  83 /*
  84  * Exported shorthand
  85  */
  86 #define v_specnext      v_specnode->sn_next
  87 #define v_rdev          v_specnode->sn_rdev
  88 #define v_speclockf     v_specnode->sn_dev->sd_lockf
  89 #define v_specmountpoint v_specnode->sn_dev->sd_mountpoint
  90
  91 /*
  92  * Special device management
  93  */
  94 #define SPECHSZ 64
  95 #if     ((SPECHSZ&(SPECHSZ-1)) == 0)
  96 #define SPECHASH(rdev)  (((rdev>>5)+(rdev))&(SPECHSZ-1))
  97 #else
  98 #define SPECHASH(rdev)  (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
  99 #endif
 100
 101 extern vnode_t  *specfs_hash[SPECHSZ];
 102
 103 void    spec_node_init(vnode_t *, dev_t);
 104 void    spec_node_destroy(vnode_t *);
 105 void    spec_node_revoke(vnode_t *);
 106
 107 /*
 108  * Prototypes for special file operations on vnodes.
 109  */
 110 extern  int (**spec_vnodeop_p)(void *);
 111 struct  nameidata;
 112 struct  componentname;
 113 struct  flock;
 114 struct  buf;
 115 struct  uio;
 116
 117 int     spec_lookup(void *);
 118 #define spec_create     genfs_badop
 119 #define spec_mknod      genfs_badop
 120 int     spec_open(void *);
 121 int     spec_close(void *);
 122 #define spec_access     genfs_ebadf
 123 #define spec_getattr    genfs_ebadf
 124 #define spec_setattr    genfs_ebadf
 125 int     spec_read(void *);
 126 int     spec_write(void *);
 127 #define spec_fcntl      genfs_fcntl
 128 int     spec_ioctl(void *);
 129 int     spec_poll(void *);
 130 int     spec_kqfilter(void *);
 131 #define spec_revoke     genfs_revoke
 132 int     spec_mmap(void *);
 133 int     spec_fsync(void *);
 134 #define spec_seek       genfs_nullop            /* XXX should query device */
 135 #define spec_remove     genfs_badop
 136 #define spec_link       genfs_badop
 137 #define spec_rename     genfs_badop
 138 #define spec_mkdir      genfs_badop
 139 #define spec_rmdir      genfs_badop
 140 #define spec_symlink    genfs_badop
 141 #define spec_readdir    genfs_badop
 142 #define spec_readlink   genfs_badop
 143 #define spec_abortop    genfs_badop
 144 #define spec_reclaim    genfs_nullop
 145 int     spec_inactive(void *);
 146 #define spec_lock       genfs_nolock
 147 #define spec_unlock     genfs_nounlock
 148 int     spec_bmap(void *);
 149 int     spec_strategy(void *);
 150 int     spec_print(void *);
 151 #define spec_islocked   genfs_noislocked
 152 int     spec_pathconf(void *);
 153 int     spec_advlock(void *);
 154 #define spec_bwrite     vn_bwrite
 155 #define spec_getpages   genfs_getpages
 156 #define spec_putpages   genfs_putpages
 157
 158 bool    iskmemvp(struct vnode *);
 159 void    spec_init(void);
 160
 161 #endif /* _MISCFS_SPECFS_SPECDEV_H_ */