bsd/miscfs/specfs/specdev.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1995, 1998 Apple Computer, Inc. All Rights Reserved.
  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. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by the University of
  44  *      California, Berkeley and its contributors.
  45  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)specdev.h   8.6 (Berkeley) 5/21/95
  62  */
  63
  64 #ifndef _MISCFS_SPECFS_SPECDEV_H_
  65 #define _MISCFS_SPECFS_SPECDEV_H_
  66
  67 #include  <sys/appleapiopts.h>
  68
  69 #ifdef __APPLE_API_PRIVATE
  70 #include <vfs/vfs_support.h>
  71
  72 /*
  73  * This structure defines the information maintained about
  74  * special devices. It is allocated in checkalias and freed
  75  * in vgone.
  76  */
  77 struct specinfo {
  78         struct  vnode **si_hashchain;
  79         struct  vnode *si_specnext;
  80         long    si_flags;
  81         dev_t   si_rdev;
  82         int32_t si_opencount;
  83         daddr_t si_size;                /* device block size in bytes */
  84         daddr64_t       si_lastr;       /* last read blkno (read-ahead) */
  85         u_int64_t       si_devsize;     /* actual device size in bytes */
  86
  87         u_int8_t        si_initted;
  88         u_int8_t        si_throttleable;
  89         u_int16_t       si_isssd;
  90         u_int32_t       si_devbsdunit;
  91         u_int64_t       si_throttle_mask;
  92 };
  93 /*
  94  * Exported shorthand
  95  */
  96 #define v_rdev v_specinfo->si_rdev
  97 #define v_hashchain v_specinfo->si_hashchain
  98 #define v_specnext v_specinfo->si_specnext
  99 #define v_specflags v_specinfo->si_flags
 100 #define v_specsize v_specinfo->si_size
 101 #define v_specdevsize v_specinfo->si_devsize
 102 #define v_speclastr v_specinfo->si_lastr
 103
 104 /*
 105  * Flags for specinfo
 106  */
 107 #define SI_MOUNTEDON    0x0001  /* block special device is mounted on */
 108 #define SI_ALIASED      0x0002  /* multiple active vnodes refer to this device */
 109
 110 /*
 111  * Special device management
 112  */
 113 #define SPECHSZ 64
 114 #if     ((SPECHSZ&(SPECHSZ-1)) == 0)
 115 #define SPECHASH(rdev)  (((rdev>>21)+(rdev))&(SPECHSZ-1))
 116 #else
 117 #define SPECHASH(rdev)  (((unsigned)((rdev>>21)+(rdev)))%SPECHSZ)
 118 #endif
 119
 120 extern struct vnode *speclisth[SPECHSZ];
 121
 122 /*
 123  * Prototypes for special file operations on vnodes.
 124  */
 125 extern  int (**spec_vnodeop_p)(void *);
 126 struct  nameidata;
 127 struct  componentname;
 128 struct  flock;
 129 struct  buf;
 130 struct  uio;
 131
 132 __BEGIN_DECLS
 133 #ifdef BSD_KERNEL_PRIVATE
 134 int spec_blktooff (struct  vnop_blktooff_args *);
 135 int spec_offtoblk (struct  vnop_offtoblk_args *);
 136 int     spec_fsync_internal (vnode_t, int, vfs_context_t);
 137 int spec_blockmap (struct  vnop_blockmap_args *);
 138 int spec_kqfilter (vnode_t vp, struct knote *kn, struct kevent_internal_s *kev);
 139 #endif /* BSD_KERNEL_PRIVATE */
 140
 141 int     spec_ebadf(void *);
 142
 143 int     spec_lookup (struct vnop_lookup_args *);
 144 #define spec_create (int (*) (struct  vnop_access_args *))err_create
 145 #define spec_mknod (int (*) (struct  vnop_access_args *))err_mknod
 146 int     spec_open (struct vnop_open_args *);
 147 int     spec_close (struct vnop_close_args *);
 148 #define spec_access (int (*) (struct  vnop_access_args *))spec_ebadf
 149 #define spec_getattr (int (*) (struct  vnop_getattr_args *))spec_ebadf
 150 #define spec_setattr (int (*) (struct  vnop_setattr_args *))spec_ebadf
 151 int     spec_read (struct vnop_read_args *);
 152 int     spec_write (struct vnop_write_args *);
 153 int     spec_ioctl (struct vnop_ioctl_args *);
 154 int     spec_select (struct vnop_select_args *);
 155 #define spec_revoke (int (*) (struct  vnop_access_args *))nop_revoke
 156 #define spec_mmap (int (*) (struct  vnop_access_args *))err_mmap
 157 int     spec_fsync (struct  vnop_fsync_args *);
 158 #define spec_remove (int (*) (struct  vnop_access_args *))err_remove
 159 #define spec_link (int (*) (struct  vnop_access_args *))err_link
 160 #define spec_rename (int (*) (struct  vnop_access_args *))err_rename
 161 #define spec_mkdir (int (*) (struct  vnop_access_args *))err_mkdir
 162 #define spec_rmdir (int (*) (struct  vnop_access_args *))err_rmdir
 163 #define spec_symlink (int (*) (struct  vnop_access_args *))err_symlink
 164 #define spec_readdir (int (*) (struct  vnop_access_args *))err_readdir
 165 #define spec_readlink (int (*) (struct  vnop_access_args *))err_readlink
 166 #define spec_inactive (int (*) (struct  vnop_access_args *))nop_inactive
 167 #define spec_reclaim (int (*) (struct  vnop_access_args *))nop_reclaim
 168 #define spec_lock (int (*) (struct  vnop_access_args *))nop_lock
 169 #define spec_unlock (int (*)(struct  vnop_access_args *))nop_unlock
 170 int     spec_strategy (struct vnop_strategy_args *);
 171 #define spec_islocked (int (*) (struct  vnop_access_args *))nop_islocked
 172 int     spec_pathconf (struct vnop_pathconf_args *);
 173 #define spec_advlock (int (*) (struct  vnop_access_args *))err_advlock
 174 #define spec_blkatoff (int (*) (struct  vnop_access_args *))err_blkatoff
 175 #define spec_valloc (int (*) (struct  vnop_access_args *))err_valloc
 176 #define spec_vfree (int (*) (struct  vnop_access_args *))err_vfree
 177 #define spec_bwrite (int (*) (struct  vnop_bwrite_args *))nop_bwrite
 178 __END_DECLS
 179
 180 #endif /* __APPLE_API_PRIVATE */
 181 #endif /* _MISCFS_SPECFS_SPECDEV_H_ */