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29 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
33 #ifndef _SYS_DISKLABEL_H_
34 #define _SYS_DISKLABEL_H_
37 #include <sys/types.h>
39 #include <sys/ioccom.h>
42 * Disk description table, see disktab(5)
44 #define _PATH_DISKTAB "/etc/disktab"
47 * Each disk has a label which includes information about the hardware
48 * disk geometry, filesystem partitions, and drive specific information.
49 * The label is in block 0 or 1, possibly offset from the beginning
50 * to leave room for a bootstrap, etc.
53 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
54 #if defined(__i386__) || defined(__amd64__) || defined(__arm__) || \
56 #define LABELSECTOR 1 /* sector containing label */
57 #define LABELOFFSET 0 /* offset of label in sector */
62 #define LABELOFFSET 64
65 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
67 #define MAXPARTITIONS 8
70 /* Size of bootblock area in sector-size neutral bytes */
73 #define LABEL_PART 2 /* partition containing label */
74 #define RAW_PART 2 /* partition containing whole disk */
75 #define SWAP_PART 1 /* partition normally containing swap */
78 u_int32_t d_magic; /* the magic number */
79 u_int16_t d_type; /* drive type */
80 u_int16_t d_subtype; /* controller/d_type specific */
81 char d_typename[16]; /* type name, e.g. "eagle" */
83 char d_packname[16]; /* pack identifier */
86 u_int32_t d_secsize; /* # of bytes per sector */
87 u_int32_t d_nsectors; /* # of data sectors per track */
88 u_int32_t d_ntracks; /* # of tracks per cylinder */
89 u_int32_t d_ncylinders; /* # of data cylinders per unit */
90 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
91 u_int32_t d_secperunit; /* # of data sectors per unit */
94 * Spares (bad sector replacements) below are not counted in
95 * d_nsectors or d_secpercyl. Spare sectors are assumed to
96 * be physical sectors which occupy space at the end of each
97 * track and/or cylinder.
99 u_int16_t d_sparespertrack; /* # of spare sectors per track */
100 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
102 * Alternate cylinders include maintenance, replacement, configuration
103 * description areas, etc.
105 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
107 /* hardware characteristics: */
109 * d_interleave, d_trackskew and d_cylskew describe perturbations
110 * in the media format used to compensate for a slow controller.
111 * Interleave is physical sector interleave, set up by the
112 * formatter or controller when formatting. When interleaving is
113 * in use, logically adjacent sectors are not physically
114 * contiguous, but instead are separated by some number of
115 * sectors. It is specified as the ratio of physical sectors
116 * traversed per logical sector. Thus an interleave of 1:1
117 * implies contiguous layout, while 2:1 implies that logical
118 * sector 0 is separated by one sector from logical sector 1.
119 * d_trackskew is the offset of sector 0 on track N relative to
120 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
121 * is the offset of sector 0 on cylinder N relative to sector 0
124 u_int16_t d_rpm; /* rotational speed */
125 u_int16_t d_interleave; /* hardware sector interleave */
126 u_int16_t d_trackskew; /* sector 0 skew, per track */
127 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
128 u_int32_t d_headswitch; /* head switch time, usec */
129 u_int32_t d_trkseek; /* track-to-track seek, usec */
130 u_int32_t d_flags; /* generic flags */
132 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
134 u_int32_t d_spare[NSPARE]; /* reserved for future use */
135 u_int32_t d_magic2; /* the magic number (again) */
136 u_int16_t d_checksum; /* xor of data incl. partitions */
138 /* filesystem and partition information: */
139 u_int16_t d_npartitions; /* number of partitions in following */
140 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
141 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
142 struct partition { /* the partition table */
143 u_int32_t p_size; /* number of sectors in partition */
144 u_int32_t p_offset; /* starting sector */
145 u_int32_t p_fsize; /* filesystem basic fragment size */
146 u_int8_t p_fstype; /* filesystem type, see below */
147 u_int8_t p_frag; /* filesystem fragments per block */
148 u_int16_t p_cpg; /* filesystem cylinders per group */
149 } d_partitions[MAXPARTITIONS]; /* actually may be more */
153 CTASSERT(sizeof(struct disklabel) == 148 + MAXPARTITIONS * 16);
156 static __inline u_int16_t dkcksum(struct disklabel *lp);
157 static __inline u_int16_t
158 dkcksum(struct disklabel *lp)
160 u_int16_t *start, *end;
163 start = (u_int16_t *)lp;
164 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
172 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
173 #define DTYPE_MSCP 2 /* MSCP */
174 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
175 #define DTYPE_SCSI 4 /* SCSI */
176 #define DTYPE_ESDI 5 /* ESDI interface */
177 #define DTYPE_ST506 6 /* ST506 etc. */
178 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
179 #define DTYPE_HPFL 8 /* HP Fiber-link */
180 #define DTYPE_FLOPPY 10 /* floppy */
181 #define DTYPE_CCD 11 /* concatenated disk */
182 #define DTYPE_VINUM 12 /* vinum volume */
183 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
184 #define DTYPE_RAID 14 /* CMU RAIDFrame */
185 #define DTYPE_JFS2 16 /* IBM JFS 2 */
188 static const char *dktypenames[] = {
208 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
212 * Filesystem type and version.
213 * Used to interpret other filesystem-specific
214 * per-partition information.
216 #define FS_UNUSED 0 /* unused */
217 #define FS_SWAP 1 /* swap */
218 #define FS_V6 2 /* Sixth Edition */
219 #define FS_V7 3 /* Seventh Edition */
220 #define FS_SYSV 4 /* System V */
221 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
222 #define FS_V8 6 /* Eighth Edition, 4K blocks */
223 #define FS_BSDFFS 7 /* 4.2BSD fast filesystem */
224 #define FS_MSDOS 8 /* MSDOS filesystem */
225 #define FS_BSDLFS 9 /* 4.4BSD log-structured filesystem */
226 #define FS_OTHER 10 /* in use, but unknown/unsupported */
227 #define FS_HPFS 11 /* OS/2 high-performance filesystem */
228 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
229 #define FS_BOOT 13 /* partition contains bootstrap */
230 #define FS_VINUM 14 /* Vinum drive */
231 #define FS_RAID 15 /* RAIDFrame drive */
232 #define FS_JFS2 21 /* IBM JFS2 */
235 static const char *fstypenames[] = {
259 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
263 * flags shared by various drives:
265 #define D_REMOVABLE 0x01 /* removable media */
266 #define D_ECC 0x02 /* supports ECC */
267 #define D_BADSECT 0x04 /* supports bad sector forw. */
268 #define D_RAMDISK 0x08 /* disk emulator */
269 #define D_CHAIN 0x10 /* can do back-back transfers */
272 * Disklabel-specific ioctls.
274 * NB: <sys/disk.h> defines ioctls from 'd'/128 and up.
276 /* get and set disklabel */
277 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
278 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
279 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
280 #define DIOCBSDBB _IOW('d', 110, void *) /* write bootblocks */
283 * Functions for proper encoding/decoding of struct disklabel into/from
286 void bsd_partition_le_dec(u_char *ptr, struct partition *d);
287 int bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart);
288 void bsd_partition_le_enc(u_char *ptr, struct partition *d);
289 void bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d);
293 struct disklabel *getdiskbyname(const char *);
297 #endif /* !_SYS_DISKLABEL_H_ */