sys/sys/disklabel64.h

   1 /*
   2  * Copyright (c) 2007 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  * $DragonFly: src/sys/sys/disklabel64.h,v 1.4 2007/06/19 06:39:10 dillon Exp $
  35  */
  36
  37 #ifndef _SYS_DISKLABEL64_H_
  38 #define _SYS_DISKLABEL64_H_
  39
  40 #ifndef _SYS_TYPES_H_
  41 #include <sys/types.h>
  42 #endif
  43 #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_)
  44 #include <sys/systm.h>
  45 #endif
  46 #ifndef _SYS_IOCCOM_H_
  47 #include <sys/ioccom.h>
  48 #endif
  49 #ifndef _SYS_UUID_H_
  50 #include <sys/uuid.h>
  51 #endif
  52
  53 /*
  54  * disklabel64's start at offset 0 on the disk or slice they reside.  All
  55  * values are byte offsets, not block numbers, in order to allow portability.
  56  * Unlike the original 32 bit disklabels, the on-disk format for a 64 bit
  57  * disklabel is slice-relative and does not have to be translated.
  58  *
  59  * Currently the number of partitions is limited to 16, but the virgin
  60  * disklabel code will leave enough space for 32.
  61  */
  62 #define DISKMAGIC64     ((u_int32_t)0xc4464c59) /* The disk magic number */
  63 #ifndef MAXPARTITIONS64
  64 #define MAXPARTITIONS64 16
  65 #endif
  66 #ifndef RESPARTITIONS64
  67 #define RESPARTITIONS64 32
  68 #endif
  69
  70 #ifndef LOCORE
  71
  72 /*
  73  * A disklabel64 starts at slice relative offset 0, NOT SECTOR 1.  In
  74  * otherwords, d_magic is at byte offset 512 within the slice, regardless
  75  * of the sector size.
  76  *
  77  * The d_reserved0 area is not included in the crc and any kernel writeback
  78  * of the label will not change the d_reserved area on-disk.  It is purely
  79  * a shim to allow us to avoid sector calculations when reading or
  80  * writing the label.  Since byte offsets are used in our 64 bit disklabel,
  81  * the entire disklabel and the I/O required to access it becomes
  82  * sector-agnostic.
  83  */
  84 struct disklabel64 {
  85         char      d_reserved0[512];     /* reserved or unused */
  86         u_int32_t d_magic;              /* the magic number */
  87         u_int32_t d_crc;                /* crc32() d_magic thru last part */
  88         u_int32_t d_align;              /* partition alignment requirement */
  89         u_int32_t d_npartitions;        /* number of partitions */
  90         struct uuid d_stor_uuid;        /* unique uuid for label */
  91
  92         u_int64_t d_total_size;         /* total size incl everything (bytes) */
  93         u_int64_t d_bbase;              /* boot area base offset (bytes) */
  94                                         /* boot area is pbase - bbase */
  95         u_int64_t d_pbase;              /* first allocatable offset (bytes) */
  96         u_int64_t d_pstop;              /* last allocatable offset+1 (bytes) */
  97         u_int64_t d_abase;              /* location of backup copy if not 0 */
  98
  99         u_char    d_packname[64];
 100         u_char    d_reserved[64];
 101
 102         /*
 103          * Note: offsets are relative to the base of the slice, NOT to
 104          * d_pbase.  Unlike 32 bit disklabels the on-disk format for
 105          * a 64 bit disklabel remains slice-relative.
 106          *
 107          * An uninitialized partition has a p_boffset and p_bsize of 0.
 108          *
 109          * If p_fstype is not supported for a live partition it is set
 110          * to FS_OTHER.  This is typically the case when the filesystem
 111          * is identified by its uuid.
 112          */
 113         struct partition64 {            /* the partition table */
 114                 u_int64_t p_boffset;    /* slice relative offset, in bytes */
 115                 u_int64_t p_bsize;      /* size of partition, in bytes */
 116                 u_int8_t  p_fstype;
 117                 u_int8_t  p_unused01;   /* reserved, must be 0 */
 118                 u_int8_t  p_unused02;   /* reserved, must be 0 */
 119                 u_int8_t  p_unused03;   /* reserved, must be 0 */
 120                 u_int32_t p_unused04;   /* reserved, must be 0 */
 121                 u_int32_t p_unused05;   /* reserved, must be 0 */
 122                 u_int32_t p_unused06;   /* reserved, must be 0 */
 123                 struct uuid p_type_uuid;/* mount type as UUID */
 124                 struct uuid p_stor_uuid;/* unique uuid for storage */
 125         } d_partitions[MAXPARTITIONS64];/* actually may be more */
 126 };
 127
 128 #ifdef _KERNEL
 129 extern struct disklabel_ops disklabel64_ops;
 130 #endif
 131
 132 /*
 133  * Disk-specific ioctls.
 134  */
 135 #define DIOCGDINFO64    _IOR('d', 101, struct disklabel64)
 136 #define DIOCSDINFO64    _IOW('d', 102, struct disklabel64)
 137 #define DIOCWDINFO64    _IOW('d', 103, struct disklabel64)
 138 #define DIOCGDVIRGIN64  _IOR('d', 105, struct disklabel64)
 139
 140 #endif /* LOCORE */
 141
 142 #endif /* !_SYS_DISKLABEL64_H_ */