204 lines
8.5 KiB
C
204 lines
8.5 KiB
C
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/* $NetBSD: disklabel.h,v 1.1.1.1 1996/01/07 21:54:16 leo Exp $ */
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/*
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* Copyright (c) 1995 Leo Weppelman.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Leo Weppelman.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef DISKLABEL_H
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#define DISKLABEL_H
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/*
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* On a volume, exclusively used by NetBSD, the boot block starts at
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* sector 0. To allow shared use of a volume between two or more OS's
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* the vendor specific AHDI format is supported. In this case the boot
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* block is located at the start of an AHDI partition. In any case the
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* size of the boot block is 8KB, the disk label is at offset 7KB.
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*/
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#define LABELSECTOR 0 /* `natural' start of boot block */
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#define LABELOFFSET (7 * 1024) /* offset of disk label in bytes,
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relative to start of boot block */
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#define BBSIZE (8 * 1024) /* size of boot block in bytes */
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#define MAXPARTITIONS 16 /* max. # of NetBSD partitions */
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#define RAW_PART 2 /* xx?c is raw partition */
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#define NO_BOOT_BLOCK ((u_int) -1)
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#define MAXAUXROOTS 60 /* max. # of auxilary root sectors */
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/***************************************************************************/
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#define AHDI_BSIZE 512 /* AHDI blocksize */
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#define AHDI_BBLOCK 0 /* AHDI bootblock (root sector) */
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#define AHDI_MAXROOTS (MAXAUXROOTS) /* max. # of AHDI rootsectors */
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#define AHDI_MAXPARTS (AHDI_MAXROOTS+3) /* max. # of AHDI partitions */
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/*
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* Various `well known' AHDI partition identifiers.
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*/
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#define AHDI_MKPID(x,y,z) ( ((u_int32_t)(x) << 16) \
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| ((u_int32_t)(y) << 8) \
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| ((u_int32_t)(z)) \
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)
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#define AHDI_PID_XGM AHDI_MKPID('X','G','M')
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#define AHDI_PID_GEM AHDI_MKPID('G','E','M')
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#define AHDI_PID_BGM AHDI_MKPID('B','G','M')
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#define AHDI_PID_RAW AHDI_MKPID('R','A','W')
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#define AHDI_PID_SWP AHDI_MKPID('S','W','P')
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#define AHDI_PID_NBD AHDI_MKPID('N','B','D')
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#define AHDI_PID_NBR AHDI_MKPID('N','B','R')
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#define AHDI_PID_NBS AHDI_MKPID('N','B','S')
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#define AHDI_PID_NBU AHDI_MKPID('N','B','U')
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/*
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* Format of AHDI boot block.
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*/
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#define AHDI_MAXRPD 4 /* max. # of partition descriptors */
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/* in the AHDI bootblock (aka root)*/
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#define AHDI_MAXARPD 2 /* max. # of partition descriptors */
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/* in an AHDI auxilary root sector */
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struct ahdi_part {
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u_int8_t ap_flg; /* bit 0 is in-use flag */
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u_int8_t ap_id[3]; /* id: GEM, BGM, XGM, UNX, MIX */
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u_int32_t ap_offs; /* block where partition starts */
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u_int32_t ap_size; /* partition size in blocks */
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#define ap_end ap_size /* in the in-core copy, store end instead of size */
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};
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struct ahdi_root {
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u_int8_t ar_fill[0x1c2];/* filler, can be boot code */
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u_int32_t ar_hdsize; /* size of entire volume in blocks */
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struct ahdi_part ar_parts[AHDI_MAXRPD]; /* root partition table */
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u_int32_t ar_bslst; /* start of bad-sector list */
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u_int32_t ar_bslsize; /* # of blocks in bad-sector list */
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u_int16_t ar_cksum;
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};
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/***************************************************************************/
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#define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
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struct disklabel {
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u_int32_t d_magic; /* the magic number */
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u_int16_t d_type; /* drive type */
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u_int16_t d_subtype; /* controller/d_type specific */
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char d_typename[16]; /* type name, e.g. "eagle" */
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/*
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* d_packname contains the pack identifier and is returned when
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* the disklabel is read off the disk or in-core copy.
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* d_boot0 and d_boot1 are the (optional) names of the
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* primary (block 0) and secondary (block 1-15) bootstraps
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* as found in /usr/mdec. These are returned when using
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* getdiskbyname(3) to retrieve the values from /etc/disktab.
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*/
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union {
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char un_d_packname[16]; /* pack identifier */
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struct {
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char *un_d_boot0; /* primary bootstrap name */
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char *un_d_boot1; /* secondary bootstrap name */
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} un_b;
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} d_un;
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#define d_packname d_un.un_d_packname
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#define d_boot0 d_un.un_b.un_d_boot0
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#define d_boot1 d_un.un_b.un_d_boot1
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/* disk geometry: */
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u_int32_t d_secsize; /* # of bytes per sector */
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u_int32_t d_nsectors; /* # of data sectors per track */
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u_int32_t d_ntracks; /* # of tracks per cylinder */
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u_int32_t d_ncylinders; /* # of data cylinders per unit */
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u_int32_t d_secpercyl; /* # of data sectors per cylinder */
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u_int32_t d_secperunit; /* # of data sectors per unit */
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/*
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* Spares (bad sector replacements) below are not counted in
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* d_nsectors or d_secpercyl. Spare sectors are assumed to
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* be physical sectors which occupy space at the end of each
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* track and/or cylinder.
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*/
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u_int16_t d_sparespertrack; /* # of spare sectors per track */
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u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
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/*
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* Alternate cylinders include maintenance, replacement, configuration
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* description areas, etc.
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*/
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u_int32_t d_acylinders; /* # of alt. cylinders per unit */
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/* hardware characteristics: */
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/*
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* d_interleave, d_trackskew and d_cylskew describe perturbations
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* in the media format used to compensate for a slow controller.
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* Interleave is physical sector interleave, set up by the
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* formatter or controller when formatting. When interleaving is
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* in use, logically adjacent sectors are not physically
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* contiguous, but instead are separated by some number of
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* sectors. It is specified as the ratio of physical sectors
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* traversed per logical sector. Thus an interleave of 1:1
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* implies contiguous layout, while 2:1 implies that logical
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* sector 0 is separated by one sector from logical sector 1.
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* d_trackskew is the offset of sector 0 on track N relative to
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* sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
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* is the offset of sector 0 on cylinder N relative to sector 0
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* on cylinder N-1.
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*/
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u_int16_t d_rpm; /* rotational speed */
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u_int16_t d_interleave; /* hardware sector interleave */
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u_int16_t d_trackskew; /* sector 0 skew, per track */
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u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
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u_int32_t d_headswitch; /* head switch time, usec */
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u_int32_t d_trkseek; /* track-to-track seek, usec */
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u_int32_t d_flags; /* generic flags */
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#define NDDATA 5
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u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
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#define NSPARE 5
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u_int32_t d_spare[NSPARE]; /* reserved for future use */
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u_int32_t d_magic2; /* the magic number (again) */
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u_int16_t d_checksum; /* xor of data incl. partitions */
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/* filesystem and partition information: */
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u_int16_t d_npartitions; /* number of partitions in following */
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u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
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u_int32_t d_sbsize; /* max size of fs superblock, bytes */
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struct partition { /* the partition table */
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u_int32_t p_size; /* number of sectors in partition */
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u_int32_t p_offset; /* starting sector */
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u_int32_t p_fsize; /* filesystem basic fragment size */
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u_int8_t p_fstype; /* filesystem type, see below */
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u_int8_t p_frag; /* filesystem fragments per block */
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union {
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u_int16_t cpg; /* UFS: FS cylinders per group */
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u_int16_t sgs; /* LFS: FS segment shift */
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} __partition_u1;
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#define p_cpg __partition_u1.cpg
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#define p_sgs __partition_u1.sgs
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} d_partitions[MAXPARTITIONS]; /* actually may be more */
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};
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#endif /* DISKLABEL_H */
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