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@ -1,4 +1,4 @@
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.\" $NetBSD: disklabel.5,v 1.3 1995/03/18 14:54:36 cgd Exp $
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.\" $NetBSD: disklabel.5,v 1.4 1996/07/03 22:38:37 pk Exp $
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.\"
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.\" Copyright (c) 1987, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -104,48 +104,50 @@ All of these operations are normally done using
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.Xr disklabel .
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.Pp
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The format of the disk label, as specified in
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.Aw Pa sys/disklabel.h ,
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.Pa sys/disklabel.h ,
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is
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.Bd -literal
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/*
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* Disk description table, see disktab(5)
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*/
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#define DISKTAB "/etc/disktab"
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#define _PATH_DISKTAB "/etc/disktab"
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/*
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* Each disk has a label which includes information about the hardware
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* disk geometry, filesystem partitions, and drive specific information.
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* The label is in block 0 or 1, possibly offset from the beginning
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* to leave room for a bootstrap, etc.
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* The location of the label, as well as the number of partitions the
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* label can describe and the number of the "whole disk" (raw)
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* paritition are machine dependent.
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*/
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#include <machine/disklabel.h>
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#ifndef LABELSECTOR
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#define LABELSECTOR 0 /* sector containing label */
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/*
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* The absolute maximum number of disk partitions allowed.
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* This is the maximum value of MAXPARTITIONS for which 'struct disklabel'
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* is <= DEV_BSIZE bytes long. If MAXPARTITIONS is greater than this, beware.
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*/
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#define MAXMAXPARTITIONS 22
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#if MAXPARTITIONS > MAXMAXPARTITIONS
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#warn beware: MAXPARTITIONS bigger than MAXMAXPARTITIONS
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#endif
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#ifndef LABELOFFSET
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#define LABELOFFSET 64 /* offset of label in sector */
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#endif
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#define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */
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#ifndef MAXPARTITIONS
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#define MAXPARTITIONS 8
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#endif
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#define DISKMAGIC ((u_int32_t) 0x82564557) /* The disk magic number */
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#ifndef LOCORE
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#ifndef _LOCORE
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struct disklabel {
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u_long d_magic; /* the magic number */
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short d_type; /* drive type */
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short d_subtype; /* controller/d_type specific */
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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)
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to retrieve the values from /etc/disktab.
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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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@ -159,76 +161,88 @@ struct disklabel {
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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_long d_secsize; /* # of bytes per sector */
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u_long d_nsectors; /* # of data sectors per track */
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u_long d_ntracks; /* # of tracks per cylinder */
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u_long d_ncylinders; /* # of data cylinders per unit */
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u_long d_secpercyl; /* # of data sectors per cylinder */
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u_long d_secperunit; /* # of data sectors per unit */
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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
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* are not counted in d_nsectors or d_secpercyl.
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* Spare sectors are assumed to be physical sectors
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* which occupy space at the end of each track and/or cylinder.
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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_short d_sparespertrack; /* # of spare sectors per track */
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u_short d_sparespercyl; /* # of spare sectors per cylinder */
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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,
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* configuration description areas, etc.
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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_long d_acylinders; /* # of alt. cylinders per unit */
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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 formatter
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* or controller when formatting. When interleaving is in use,
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* logically adjacent sectors are not physically contiguous,
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* but instead are separated by some number of sectors.
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* It is specified as the ratio of physical sectors traversed
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* per logical sector. Thus an interleave of 1:1 implies contiguous
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* layout, while 2:1 implies that logical sector 0 is separated
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* by one sector from logical sector 1.
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* d_trackskew is the offset of sector 0 on track N
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* relative to sector 0 on track N-1 on the same cylinder.
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* Finally, d_cylskew is the offset of sector 0 on cylinder N
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* relative to sector 0 on cylinder N-1.
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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_short d_rpm; /* rotational speed */
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u_short d_interleave; /* hardware sector interleave */
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u_short d_trackskew; /* sector 0 skew, per track */
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u_short d_cylskew; /* sector 0 skew, per cylinder */
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u_long d_headswitch; /* head switch time, usec */
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u_long d_trkseek; /* track-to-track seek, usec */
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u_long d_flags; /* generic flags */
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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_long d_drivedata[NDDATA]; /* drive-type specific information */
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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_long d_spare[NSPARE]; /* reserved for future use */
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u_long d_magic2; /* the magic number (again) */
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u_short d_checksum; /* xor of data incl. partitions */
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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_short d_npartitions; /* number of partitions in following */
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u_long d_bbsize; /* size of boot area at sn0, bytes */
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u_long d_sbsize; /* max size of fs superblock, bytes */
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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_long p_size; /* number of sectors in partition */
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u_long p_offset; /* starting sector */
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u_long p_fsize; /* filesystem basic fragment size */
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u_char p_fstype; /* filesystem type, see below */
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u_char p_frag; /* filesystem fragments per block */
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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_short cpg; /* UFS: FS cylinders per group */
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u_short sgs; /* LFS: FS segment shift */
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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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u_short p_cpg; /* filesystem cylinders per group */
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} d_partitions[MAXPARTITIONS]; /* actually may be more */
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};
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#else /* _LOCORE */
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/*
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* offsets for asm boot files.
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*/
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.set d_secsize,40
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.set d_nsectors,44
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.set d_ntracks,48
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.set d_ncylinders,52
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.set d_secpercyl,56
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.set d_secperunit,60
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.set d_end_,276 /* size of disk label */
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#endif /* _LOCORE */
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/* d_type values: */
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#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
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@ -240,6 +254,8 @@ struct disklabel {
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#define DTYPE_HPIB 7 /* CS/80 on HP-IB */
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#define DTYPE_HPFL 8 /* HP Fiber-link */
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#define DTYPE_FLOPPY 10 /* floppy */
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#define DTYPE_CCD 11 /* concatenated disk device */
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#define DTYPE_VND 12 /* vnode pseudo-disk */
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#ifdef DKTYPENAMES
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static char *dktypenames[] = {
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@ -254,6 +270,8 @@ static char *dktypenames[] = {
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"HP-FL",
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"type 9",
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"floppy",
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"ccd",
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"vnd",
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0
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};
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#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
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@ -278,6 +296,9 @@ static char *dktypenames[] = {
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#define FS_HPFS 11 /* OS/2 high-performance file system */
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#define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
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#define FS_BOOT 13 /* partition contains bootstrap */
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#define FS_ADOS 14 /* AmigaDOS fast file system */
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#define FS_HFS 15 /* Macintosh HFS */
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#define FS_ADFS 16 /* Acorn Disk Filing System */
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#ifdef DKTYPENAMES
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static char *fstypenames[] = {
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@ -295,6 +316,9 @@ static char *fstypenames[] = {
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"HPFS",
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"ISO9660",
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"boot",
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"ADOS",
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"HFS",
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"ADFS",
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0
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};
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#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
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*/
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#define d_blind d_drivedata[0]
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#ifndef LOCORE
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#ifndef _LOCORE
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/*
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* Structure used to perform a format
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* or other raw operation, returning data
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* and/or register values.
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* Register identification and format
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* are device- and driver-dependent.
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* Structure used to perform a format or other raw operation,
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* returning data and/or register values. Register identification
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* and format are device- and driver-dependent.
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*/
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struct format_op {
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char *df_buf;
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@ -353,7 +375,12 @@ struct partinfo {
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struct disklabel *disklab;
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struct partition *part;
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};
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.Ed
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.Pp
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Disk specific ioctls ar defined in
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.Pa sys/dkio.h .
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.Bd -literal
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/*
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* Disk-specific ioctls.
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*/
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@ -373,7 +400,7 @@ struct partinfo {
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#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */
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#endif LOCORE
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#endif _LOCORE
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.Ed
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.Sh SEE ALSO
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.Xr disktab 5 ,
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