* Copyright (c) 1987, 1988 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
* @(#)disklabel.h 7.10 (Berkeley) 6/27/88
* Disk description table, see disktab(5)
#define DISKTAB "/etc/disktab"
* Each disk has a label which includes information about the hardware
* disk geometry, filesystem partitions, and drive specific information.
* The label is in block 0 or 1, possibly offset from the beginning
* to leave room for a bootstrap, etc.
#define LABELSECTOR 0 /* sector containing label */
#define LABELOFFSET 64 /* offset of label in sector */
#define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */
u_long d_magic
; /* the magic number */ short d_type
; /* drive type */
short d_subtype
; /* controller/d_type specific */
char d_typename
[16]; /* type name, e.g. "eagle" */
* d_packname contains the pack identifier and is returned when
* the disklabel is read off the disk or in-core copy.
* d_boot0 and d_boot1 are the (optional) names of the
* primary (block 0) and secondary (block 1-15) bootstraps
* as found in /usr/mdec. These are returned when using
* getdiskbyname(3) to retrieve the values from /etc/disktab.
#if defined(KERNEL) || defined(STANDALONE)
char d_packname
[16]; /* pack identifier */
char un_d_packname
[16]; /* pack identifier */
char *un_d_boot0
; /* primary bootstrap name */
char *un_d_boot1
; /* secondary bootstrap name */
#define d_packname d_un.un_d_packname
#define d_boot0 d_un.un_b.un_d_boot0
#define d_boot1 d_un.un_b.un_d_boot1
#endif /* ! KERNEL or STANDALONE */
u_long d_secsize
; /* # of bytes per sector */ u_long d_nsectors
; /* # of data sectors per track */ u_long d_ntracks
; /* # of tracks per cylinder */ u_long d_ncylinders
; /* # of data cylinders per unit */ u_long d_secpercyl
; /* # of data sectors per cylinder */ u_long d_secperunit
; /* # of data sectors per unit */ * Spares (bad sector replacements) below
* are not counted in d_nsectors or d_secpercyl.
* Spare sectors are assumed to be physical sectors
* which occupy space at the end of each track and/or cylinder.
u_short d_sparespertrack
; /* # of spare sectors per track */ u_short d_sparespercyl
; /* # of spare sectors per cylinder */ * Alternate cylinders include maintenance, replacement,
* configuration description areas, etc.
u_long d_acylinders
; /* # of alt. cylinders per unit */ /* hardware characteristics: */
* d_interleave, d_trackskew and d_cylskew describe perturbations
* in the media format used to compensate for a slow controller.
* Interleave is physical sector interleave, set up by the formatter
* or controller when formatting. When interleaving is in use,
* logically adjacent sectors are not physically contiguous,
* but instead are separated by some number of sectors.
* It is specified as the ratio of physical sectors traversed
* per logical sector. Thus an interleave of 1:1 implies contiguous
* layout, while 2:1 implies that logical sector 0 is separated
* by one sector from logical sector 1.
* d_trackskew is the offset of sector 0 on track N
* relative to sector 0 on track N-1 on the same cylinder.
* Finally, d_cylskew is the offset of sector 0 on cylinder N
* relative to sector 0 on cylinder N-1.
u_short d_rpm
; /* rotational speed */ u_short d_interleave
; /* hardware sector interleave */ u_short d_trackskew
; /* sector 0 skew, per track */ u_short d_cylskew
; /* sector 0 skew, per cylinder */ u_long d_headswitch
; /* head switch time, usec */ u_long d_trkseek
; /* track-to-track seek, usec */ u_long d_flags
; /* generic flags */ u_long d_drivedata
[NDDATA
]; /* drive-type specific information */ u_long d_spare
[NSPARE
]; /* reserved for future use */ u_long d_magic2
; /* the magic number (again) */ u_short d_checksum
; /* xor of data incl. partitions */ /* filesystem and partition information: */
u_short d_npartitions
; /* number of partitions in following */ u_long d_bbsize
; /* size of boot area at sn0, bytes */ u_long d_sbsize
; /* max size of fs superblock, bytes */ struct partition
{ /* the partition table */
u_long p_size
; /* number of sectors in partition */ u_long p_offset
; /* starting sector */ u_long p_fsize
; /* filesystem basic fragment size */ u_char p_fstype
; /* filesystem type, see below */ u_char p_frag
; /* filesystem fragments per block */ u_short p_cpg
; /* filesystem cylinders per group */ } d_partitions
[MAXPARTITIONS
]; /* actually may be more */
* offsets for asm boot files.
.set d_end_
,276 /* size of disk label */
#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
#define DTYPE_MSCP 2 /* MSCP */
#define DTYPE_DEC 3 /* other DEC (rk, rl) */
#define DTYPE_SCSI 4 /* SCSI */
#define DTYPE_ESDI 5 /* ESDI interface */
#define DTYPE_ST506 6 /* ST506 etc. */
#define DTYPE_FLOPPY 10 /* floppy */
static char *dktypenames
[] = {
#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
* Filesystem type and version.
* Used to interpret other filesystem-specific
* per-partition information.
#define FS_UNUSED 0 /* unused */
#define FS_SWAP 1 /* swap */
#define FS_V6 2 /* Sixth Edition */
#define FS_V7 3 /* Seventh Edition */
#define FS_SYSV 4 /* System V */
#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
#define FS_V8 6 /* Eighth Edition, 4K blocks */
#define FS_BSDFFS 7 /* 4.2BSD fast file system */
static char *fstypenames
[] = {
#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
* flags shared by various drives:
#define D_REMOVABLE 0x01 /* removable media */
#define D_ECC 0x02 /* supports ECC */
#define D_BADSECT 0x04 /* supports bad sector forw. */
#define D_RAMDISK 0x08 /* disk emulator */
#define D_CHAIN 0x10 /* can do back-back transfers */
#define d_smdflags d_drivedata[0]
#define D_SSE 0x1 /* supports skip sectoring */
#define d_mindist d_drivedata[1]
#define d_maxdist d_drivedata[2]
#define d_sdist d_drivedata[3]
#define d_precompcyl d_drivedata[0]
#define d_gap3 d_drivedata[1] /* used only when formatting */
* Structure used to perform a format
* or other raw operation, returning data
* and/or register values.
* Register identification and format
* are device- and driver-dependent.
int df_count
; /* value-result */
int df_reg
[8]; /* result */
* Structure used internally to retrieve
* information about a partition on a disk.
struct disklabel
*disklab
;
/* get and set disklabel; DIOCGPART used internally */
#define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
#define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
#define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
/* do format operation, read or write */
#define DIOCRFORMAT _IOWR('d', 105, struct format_op)
#define DIOCWFORMAT _IOWR('d', 106, struct format_op)
#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */
#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */
#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */
#if !defined(KERNEL) && !defined(LOCORE)
struct disklabel
*getdiskbyname();
projects / unix-history / blob