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29 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
33 #ifndef _SYS_DISK_BSD_H_
34 #define _SYS_DISK_BSD_H_
36 /* The disk magic number */
37 #define BSD_MAGIC 0x82564557U
39 #define BSD_NPARTS_MIN 8
40 #define BSD_NPARTS_MAX 20
42 /* Size of bootblock area in sector-size neutral bytes */
43 #define BSD_BOOTBLOCK_SIZE 8192
45 /* partition containing whole disk */
46 #define BSD_PART_RAW 2
48 /* partition normally containing swap */
49 #define BSD_PART_SWAP 1
51 /* Drive-type specific data size (in number of 32-bit inegrals) */
52 #define BSD_NDRIVEDATA 5
54 /* Number of spare 32-bit integrals following drive-type data */
58 uint32_t d_magic; /* the magic number */
59 uint16_t d_type; /* drive type */
60 uint16_t d_subtype; /* controller/d_type specific */
61 char d_typename[16]; /* type name, e.g. "eagle" */
63 char d_packname[16]; /* pack identifier */
66 uint32_t d_secsize; /* # of bytes per sector */
67 uint32_t d_nsectors; /* # of data sectors per track */
68 uint32_t d_ntracks; /* # of tracks per cylinder */
69 uint32_t d_ncylinders; /* # of data cylinders per unit */
70 uint32_t d_secpercyl; /* # of data sectors per cylinder */
71 uint32_t d_secperunit; /* # of data sectors per unit */
74 * Spares (bad sector replacements) below are not counted in
75 * d_nsectors or d_secpercyl. Spare sectors are assumed to
76 * be physical sectors which occupy space at the end of each
77 * track and/or cylinder.
79 uint16_t d_sparespertrack; /* # of spare sectors per track */
80 uint16_t d_sparespercyl; /* # of spare sectors per cylinder */
82 * Alternate cylinders include maintenance, replacement, configuration
83 * description areas, etc.
85 uint32_t d_acylinders; /* # of alt. cylinders per unit */
87 /* hardware characteristics: */
89 * d_interleave, d_trackskew and d_cylskew describe perturbations
90 * in the media format used to compensate for a slow controller.
91 * Interleave is physical sector interleave, set up by the
92 * formatter or controller when formatting. When interleaving is
93 * in use, logically adjacent sectors are not physically
94 * contiguous, but instead are separated by some number of
95 * sectors. It is specified as the ratio of physical sectors
96 * traversed per logical sector. Thus an interleave of 1:1
97 * implies contiguous layout, while 2:1 implies that logical
98 * sector 0 is separated by one sector from logical sector 1.
99 * d_trackskew is the offset of sector 0 on track N relative to
100 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
101 * is the offset of sector 0 on cylinder N relative to sector 0
104 uint16_t d_rpm; /* rotational speed */
105 uint16_t d_interleave; /* hardware sector interleave */
106 uint16_t d_trackskew; /* sector 0 skew, per track */
107 uint16_t d_cylskew; /* sector 0 skew, per cylinder */
108 uint32_t d_headswitch; /* head switch time, usec */
109 uint32_t d_trkseek; /* track-to-track seek, usec */
110 uint32_t d_flags; /* generic flags */
111 uint32_t d_drivedata[BSD_NDRIVEDATA]; /* drive-type specific data */
112 uint32_t d_spare[BSD_NSPARE]; /* reserved for future use */
113 uint32_t d_magic2; /* the magic number (again) */
114 uint16_t d_checksum; /* xor of data incl. partitions */
116 /* filesystem and partition information: */
117 uint16_t d_npartitions; /* number of partitions in following */
118 uint32_t d_bbsize; /* size of boot area at sn0, bytes */
119 uint32_t d_sbsize; /* max size of fs superblock, bytes */
120 struct partition { /* the partition table */
121 uint32_t p_size; /* number of sectors in partition */
122 uint32_t p_offset; /* starting sector */
123 uint32_t p_fsize; /* filesystem basic fragment size */
124 uint8_t p_fstype; /* filesystem type, see below */
125 uint8_t p_frag; /* filesystem fragments per block */
126 uint16_t p_cpg; /* filesystem cylinders per group */
127 } d_partitions[BSD_NPARTS_MIN]; /* actually may be more */
130 CTASSERT(sizeof(struct disklabel) == 148 + BSD_NPARTS_MIN * 16);
134 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
135 #define DTYPE_MSCP 2 /* MSCP */
136 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
137 #define DTYPE_SCSI 4 /* SCSI */
138 #define DTYPE_ESDI 5 /* ESDI interface */
139 #define DTYPE_ST506 6 /* ST506 etc. */
140 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
141 #define DTYPE_HPFL 8 /* HP Fiber-link */
142 #define DTYPE_FLOPPY 10 /* floppy */
143 #define DTYPE_CCD 11 /* concatenated disk */
144 #define DTYPE_VINUM 12 /* vinum volume */
145 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
146 #define DTYPE_RAID 14 /* CMU RAIDFrame */
147 #define DTYPE_JFS2 16 /* IBM JFS 2 */
150 * Filesystem type and version.
151 * Used to interpret other filesystem-specific
152 * per-partition information.
154 #define FS_UNUSED 0 /* unused */
155 #define FS_SWAP 1 /* swap */
156 #define FS_V6 2 /* Sixth Edition */
157 #define FS_V7 3 /* Seventh Edition */
158 #define FS_SYSV 4 /* System V */
159 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
160 #define FS_V8 6 /* Eighth Edition, 4K blocks */
161 #define FS_BSDFFS 7 /* 4.2BSD fast filesystem */
162 #define FS_MSDOS 8 /* MSDOS filesystem */
163 #define FS_BSDLFS 9 /* 4.4BSD log-structured filesystem */
164 #define FS_OTHER 10 /* in use, but unknown/unsupported */
165 #define FS_HPFS 11 /* OS/2 high-performance filesystem */
166 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
167 #define FS_BOOT 13 /* partition contains bootstrap */
168 #define FS_VINUM 14 /* Vinum drive */
169 #define FS_RAID 15 /* RAIDFrame drive */
170 #define FS_FILECORE 16 /* Acorn Filecore Filing System */
171 #define FS_EXT2FS 17 /* ext2fs */
172 #define FS_NTFS 18 /* Windows/NT file system */
173 #define FS_CCD 20 /* concatenated disk component */
174 #define FS_JFS2 21 /* IBM JFS2 */
175 #define FS_HAMMER 22 /* DragonFlyBSD Hammer FS */
176 #define FS_HAMMER2 23 /* DragonFlyBSD Hammer2 FS */
177 #define FS_UDF 24 /* UDF */
178 #define FS_EFS 26 /* SGI's Extent File system */
179 #define FS_ZFS 27 /* Sun's ZFS */
180 #define FS_NANDFS 30 /* FreeBSD nandfs (NiLFS derived) */
183 * flags shared by various drives:
185 #define D_REMOVABLE 0x01 /* removable media */
186 #define D_ECC 0x02 /* supports ECC */
187 #define D_BADSECT 0x04 /* supports bad sector forw. */
188 #define D_RAMDISK 0x08 /* disk emulator */
189 #define D_CHAIN 0x10 /* can do back-back transfers */
191 #endif /* !_SYS_DISK_BSD_H_ */