FreeBSD/Linux Kernel Cross Reference
sys/sys/disklabel64.h

     /*
      * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
      * 
      * This code is derived from software contributed to The DragonFly Project
      * by Matthew Dillon <dillon@backplane.com>
      * 
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in
     *    the documentation and/or other materials provided with the
     *    distribution.
     * 3. Neither the name of The DragonFly Project nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific, prior written permission.
     * 
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
     * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     * 
     * $DragonFly: src/sys/sys/disklabel64.h,v 1.4 2007/06/19 06:39:10 dillon Exp $
     */
    
    #ifndef _SYS_DISKLABEL64_H_
    #define _SYS_DISKLABEL64_H_
    
    #ifndef _SYS_TYPES_H_
    #include <sys/types.h>
    #endif
    #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_)
    #include <sys/systm.h>
    #endif
    #ifndef _SYS_IOCCOM_H_
    #include <sys/ioccom.h>
    #endif
    #ifndef _SYS_UUID_H_
    #include <sys/uuid.h>
    #endif
    
    /*
     * disklabel64's start at offset 0 on the disk or slice they reside.  All
     * values are byte offsets, not block numbers, in order to allow portability.
     * Unlike the original 32 bit disklabels, the on-disk format for a 64 bit
     * disklabel is slice-relative and does not have to be translated.
     *
     * Currently the number of partitions is limited to 16, but the virgin
     * disklabel code will leave enough space for 32.
     */
    #define DISKMAGIC64     ((u_int32_t)0xc4464c59) /* The disk magic number */
    #ifndef MAXPARTITIONS64
    #define MAXPARTITIONS64 16
    #endif
    #ifndef RESPARTITIONS64
    #define RESPARTITIONS64 32
    #endif
    
    #ifndef LOCORE
    
    /*
     * A disklabel64 starts at slice relative offset 0, NOT SECTOR 1.  In
     * otherwords, d_magic is at byte offset 512 within the slice, regardless
     * of the sector size.
     *
     * The d_reserved0 area is not included in the crc and any kernel writeback
     * of the label will not change the d_reserved area on-disk.  It is purely
     * a shim to allow us to avoid sector calculations when reading or
     * writing the label.  Since byte offsets are used in our 64 bit disklabel,
     * the entire disklabel and the I/O required to access it becomes
     * sector-agnostic.
     */
    struct disklabel64 {
            char      d_reserved0[512];     /* reserved or unused */
            u_int32_t d_magic;              /* the magic number */
            u_int32_t d_crc;                /* crc32() d_magic thru last part */
            u_int32_t d_align;              /* partition alignment requirement */
            u_int32_t d_npartitions;        /* number of partitions */
            struct uuid d_stor_uuid;        /* unique uuid for label */
    
            u_int64_t d_total_size;         /* total size incl everything (bytes) */
            u_int64_t d_bbase;              /* boot area base offset (bytes) */
                                            /* boot area is pbase - bbase */
            u_int64_t d_pbase;              /* first allocatable offset (bytes) */
            u_int64_t d_pstop;              /* last allocatable offset+1 (bytes) */
            u_int64_t d_abase;              /* location of backup copy if not 0 */
    
            u_char    d_packname[64];
           u_char    d_reserved[64];
   
           /*
            * Note: offsets are relative to the base of the slice, NOT to
            * d_pbase.  Unlike 32 bit disklabels the on-disk format for
            * a 64 bit disklabel remains slice-relative.
            *
            * An uninitialized partition has a p_boffset and p_bsize of 0.
            *
            * If p_fstype is not supported for a live partition it is set
            * to FS_OTHER.  This is typically the case when the filesystem
            * is identified by its uuid.
            */
           struct partition64 {            /* the partition table */
                   u_int64_t p_boffset;    /* slice relative offset, in bytes */
                   u_int64_t p_bsize;      /* size of partition, in bytes */
                   u_int8_t  p_fstype;
                   u_int8_t  p_unused01;   /* reserved, must be 0 */
                   u_int8_t  p_unused02;   /* reserved, must be 0 */
                   u_int8_t  p_unused03;   /* reserved, must be 0 */
                   u_int32_t p_unused04;   /* reserved, must be 0 */
                   u_int32_t p_unused05;   /* reserved, must be 0 */
                   u_int32_t p_unused06;   /* reserved, must be 0 */
                   struct uuid p_type_uuid;/* mount type as UUID */
                   struct uuid p_stor_uuid;/* unique uuid for storage */
           } d_partitions[MAXPARTITIONS64];/* actually may be more */
   };
   
   #ifdef _KERNEL
   extern struct disklabel_ops disklabel64_ops;
   #endif
   
   /*
    * Disk-specific ioctls.
    */
   #define DIOCGDINFO64    _IOR('d', 101, struct disklabel64)
   #define DIOCSDINFO64    _IOW('d', 102, struct disklabel64)
   #define DIOCWDINFO64    _IOW('d', 103, struct disklabel64)
   #define DIOCGDVIRGIN64  _IOR('d', 105, struct disklabel64)
   
   #endif /* LOCORE */
   
   #endif /* !_SYS_DISKLABEL64_H_ */

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