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