sys/sys/disk.h

   1 /*
   2  * Copyright (c) 2003,2004 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   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  *
  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
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * ----------------------------------------------------------------------------
  35  * "THE BEER-WARE LICENSE" (Revision 42):
  36  * <phk@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
  37  * can do whatever you want with this stuff. If we meet some day, and you think
  38  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
  39  * ----------------------------------------------------------------------------
  40  *
  41  * $FreeBSD: src/sys/sys/disk.h,v 1.16.2.3 2001/06/20 16:11:01 scottl Exp $
  42  * $DragonFly: src/sys/sys/disk.h,v 1.18 2007/07/30 08:02:40 dillon Exp $
  43  */
  44
  45 #ifndef _SYS_DISK_H_
  46 #define _SYS_DISK_H_
  47
  48 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
  49 #error "This file should not be included by userland programs."
  50 #endif
  51
  52 #ifndef _SYS_DISKSLICE_H_
  53 #include <sys/diskslice.h>
  54 #endif
  55 #ifndef _SYS_QUEUE_H_
  56 #include <sys/queue.h>
  57 #endif
  58
  59 /*
  60  * Media information structure - filled in by the media driver.
  61  */
  62 struct disk_info {
  63         /*
  64          * These fields are required.  Most drivers will load a disk_info
  65          * structure in the device open function with the media parameters
  66          * and call disk_setdiskinfo().
  67          *
  68          * Note that only one of d_media_size or d_media_blocks should be
  69          * filled in.
  70          *
  71          * d_media_size         media size in bytes
  72          * d_media_blocks       media size in blocks (e.g. total sectors)
  73          * d_media_blksize      media block size / sector size
  74          * d_dsflags            disklabel management flags
  75          */
  76         u_int64_t               d_media_size;
  77         u_int64_t               d_media_blocks;
  78         int                     d_media_blksize;
  79         u_int                   d_dsflags;
  80
  81         /*
  82          * Optional fields, leave 0 if not known
  83          */
  84         u_int                   d_type;         /* DTYPE_xxx */
  85         u_int                   d_nheads;
  86         u_int                   d_ncylinders;
  87         u_int                   d_secpertrack;
  88         u_int                   d_secpercyl;
  89 };
  90
  91 /*
  92  * d_dsflags, also used for dsopen() - control disklabel processing
  93  *
  94  * COMPATPARTA  - used by scsi devices to allow CDs to boot from cd0a.
  95  *                cd's don't have disklabels and the default compat label
  96  *                does not implement an 'a' partition.
  97  *
  98  * COMPARTMBR   - used by the vn device to request that one sector be
  99  *                reserved as if an MBR were present even when one isn't.
 100  */
 101 #define DSO_NOLABELS            0x0001
 102 #define DSO_ONESLICE            0x0002
 103 #define DSO_COMPATLABEL         0x0004
 104 #define DSO_COMPATPARTA         0x0008
 105 #define DSO_COMPATMBR           0x0010
 106 #define DSO_RAWEXTENSIONS       0x0020
 107
 108 /*
 109  * Disk management structure - automated disklabel support.
 110  */
 111 struct disk {
 112         struct dev_ops          *d_dev_ops;     /* our device switch */
 113         struct dev_ops          *d_raw_ops;     /* the raw device switch */
 114         u_int                   d_flags;
 115         cdev_t                  d_rawdev;       /* backing raw device */
 116         cdev_t                  d_cdev;         /* special whole-disk part */
 117         struct diskslices       *d_slice;
 118         struct disk_info        d_info;         /* info structure for media */
 119         LIST_ENTRY(disk)        d_list;
 120 };
 121
 122 /*
 123  * d_flags
 124  */
 125 #define DISKFLAG_LOCK           0x1
 126 #define DISKFLAG_WANTED         0x2
 127
 128 #ifdef _KERNEL
 129 cdev_t disk_create (int unit, struct disk *disk, struct dev_ops *raw_ops);
 130 cdev_t disk_locate (const char *devname);
 131 void disk_destroy (struct disk *disk);
 132 void disk_setdiskinfo (struct disk *disk, struct disk_info *info);
 133 int disk_dumpcheck (cdev_t dev, u_int64_t *count, u_int64_t *blkno, u_int *secsize);
 134 struct disk *disk_enumerate (struct disk *disk);
 135 void disk_invalidate (struct disk *disk);
 136 #endif /* _KERNEL */
 137
 138 #endif /* _SYS_DISK_H_ */