2 * Copyright (c) 1987, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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33 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
37 #ifndef _SYS_DISKLABEL_H_
38 #define _SYS_DISKLABEL_H_
41 #include <sys/types.h>
43 #include <sys/ioccom.h>
46 * Disk description table, see disktab(5)
48 #define _PATH_DISKTAB "/etc/disktab"
51 * Each disk has a label which includes information about the hardware
52 * disk geometry, filesystem partitions, and drive specific information.
53 * The label is in block 0 or 1, possibly offset from the beginning
54 * to leave room for a bootstrap, etc.
57 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
59 #define LABELSECTOR 1 /* sector containing label */
60 #define LABELOFFSET 0 /* offset of label in sector */
65 #define LABELOFFSET 64
75 #define LABELOFFSET 128
83 #define LABELOFFSET 64
86 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
88 #define MAXPARTITIONS 8
91 /* Size of bootblock area in sector-size neutral bytes */
94 #define LABEL_PART 2 /* partition containing label */
95 #define RAW_PART 2 /* partition containing whole disk */
96 #define SWAP_PART 1 /* partition normally containing swap */
99 u_int32_t d_magic; /* the magic number */
100 u_int16_t d_type; /* drive type */
101 u_int16_t d_subtype; /* controller/d_type specific */
102 char d_typename[16]; /* type name, e.g. "eagle" */
104 char d_packname[16]; /* pack identifier */
107 u_int32_t d_secsize; /* # of bytes per sector */
108 u_int32_t d_nsectors; /* # of data sectors per track */
109 u_int32_t d_ntracks; /* # of tracks per cylinder */
110 u_int32_t d_ncylinders; /* # of data cylinders per unit */
111 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
112 u_int32_t d_secperunit; /* # of data sectors per unit */
115 * Spares (bad sector replacements) below are not counted in
116 * d_nsectors or d_secpercyl. Spare sectors are assumed to
117 * be physical sectors which occupy space at the end of each
118 * track and/or cylinder.
120 u_int16_t d_sparespertrack; /* # of spare sectors per track */
121 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
123 * Alternate cylinders include maintenance, replacement, configuration
124 * description areas, etc.
126 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
128 /* hardware characteristics: */
130 * d_interleave, d_trackskew and d_cylskew describe perturbations
131 * in the media format used to compensate for a slow controller.
132 * Interleave is physical sector interleave, set up by the
133 * formatter or controller when formatting. When interleaving is
134 * in use, logically adjacent sectors are not physically
135 * contiguous, but instead are separated by some number of
136 * sectors. It is specified as the ratio of physical sectors
137 * traversed per logical sector. Thus an interleave of 1:1
138 * implies contiguous layout, while 2:1 implies that logical
139 * sector 0 is separated by one sector from logical sector 1.
140 * d_trackskew is the offset of sector 0 on track N relative to
141 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
142 * is the offset of sector 0 on cylinder N relative to sector 0
145 u_int16_t d_rpm; /* rotational speed */
146 u_int16_t d_interleave; /* hardware sector interleave */
147 u_int16_t d_trackskew; /* sector 0 skew, per track */
148 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
149 u_int32_t d_headswitch; /* head switch time, usec */
150 u_int32_t d_trkseek; /* track-to-track seek, usec */
151 u_int32_t d_flags; /* generic flags */
153 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
155 u_int32_t d_spare[NSPARE]; /* reserved for future use */
156 u_int32_t d_magic2; /* the magic number (again) */
157 u_int16_t d_checksum; /* xor of data incl. partitions */
159 /* filesystem and partition information: */
160 u_int16_t d_npartitions; /* number of partitions in following */
161 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
162 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
163 struct partition { /* the partition table */
164 u_int32_t p_size; /* number of sectors in partition */
165 u_int32_t p_offset; /* starting sector */
166 u_int32_t p_fsize; /* filesystem basic fragment size */
167 u_int8_t p_fstype; /* filesystem type, see below */
168 u_int8_t p_frag; /* filesystem fragments per block */
169 u_int16_t p_cpg; /* filesystem cylinders per group */
170 } d_partitions[MAXPARTITIONS]; /* actually may be more */
174 CTASSERT(sizeof(struct disklabel) == 276);
177 static __inline u_int16_t dkcksum(struct disklabel *lp);
178 static __inline u_int16_t
179 dkcksum(struct disklabel *lp)
181 u_int16_t *start, *end;
184 start = (u_int16_t *)lp;
185 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
193 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
194 #define DTYPE_MSCP 2 /* MSCP */
195 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
196 #define DTYPE_SCSI 4 /* SCSI */
197 #define DTYPE_ESDI 5 /* ESDI interface */
198 #define DTYPE_ST506 6 /* ST506 etc. */
199 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
200 #define DTYPE_HPFL 8 /* HP Fiber-link */
201 #define DTYPE_FLOPPY 10 /* floppy */
202 #define DTYPE_CCD 11 /* concatenated disk */
203 #define DTYPE_VINUM 12 /* vinum volume */
204 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
205 #define DTYPE_JFS2 16 /* IBM JFS 2 */
208 static const char *dktypenames[] = {
228 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
232 * Filesystem type and version.
233 * Used to interpret other filesystem-specific
234 * per-partition information.
236 #define FS_UNUSED 0 /* unused */
237 #define FS_SWAP 1 /* swap */
238 #define FS_V6 2 /* Sixth Edition */
239 #define FS_V7 3 /* Seventh Edition */
240 #define FS_SYSV 4 /* System V */
241 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
242 #define FS_V8 6 /* Eighth Edition, 4K blocks */
243 #define FS_BSDFFS 7 /* 4.2BSD fast filesystem */
244 #define FS_MSDOS 8 /* MSDOS filesystem */
245 #define FS_BSDLFS 9 /* 4.4BSD log-structured filesystem */
246 #define FS_OTHER 10 /* in use, but unknown/unsupported */
247 #define FS_HPFS 11 /* OS/2 high-performance filesystem */
248 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
249 #define FS_BOOT 13 /* partition contains bootstrap */
250 #define FS_VINUM 14 /* Vinum drive */
251 #define FS_JFS2 21 /* IBM JFS2 */
254 static const char *fstypenames[] = {
280 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
284 * flags shared by various drives:
286 #define D_REMOVABLE 0x01 /* removable media */
287 #define D_ECC 0x02 /* supports ECC */
288 #define D_BADSECT 0x04 /* supports bad sector forw. */
289 #define D_RAMDISK 0x08 /* disk emulator */
290 #define D_CHAIN 0x10 /* can do back-back transfers */
292 /* DOS partition table -- located in boot block */
294 #if defined(PC98) && !defined(PC98_ATCOMPAT)
295 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
298 #define DOSPTYP_386BSD 0x94 /* 386BSD partition type */
300 struct dos_partition {
301 unsigned char dp_mid;
302 #define DOSMID_386BSD (0x14|0x80) /* 386bsd|bootable */
303 unsigned char dp_sid;
304 #define DOSSID_386BSD (0x44|0x80) /* 386bsd|active */
305 unsigned char dp_dum1;
306 unsigned char dp_dum2;
307 unsigned char dp_ipl_sct;
308 unsigned char dp_ipl_head;
309 unsigned short dp_ipl_cyl;
310 unsigned char dp_ssect; /* starting sector */
311 unsigned char dp_shd; /* starting head */
312 unsigned short dp_scyl; /* starting cylinder */
313 unsigned char dp_esect; /* end sector */
314 unsigned char dp_ehd; /* end head */
315 unsigned short dp_ecyl; /* end cylinder */
316 unsigned char dp_name[16];
320 #define DOSBBSECTOR 0 /* DOS boot block relative sector number */
321 #define DOSPARTOFF 446
323 #define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */
324 #define DOSPTYP_LINSWP 0x82 /* Linux swap partition */
325 #define DOSPTYP_LINUX 0x83 /* Linux partition */
326 #define DOSPTYP_EXT 5 /* DOS extended partition */
327 #define DOSPTYP_EXTLBA 15 /* DOS extended partition */
329 struct dos_partition {
330 unsigned char dp_flag; /* bootstrap flags */
331 unsigned char dp_shd; /* starting head */
332 unsigned char dp_ssect; /* starting sector */
333 unsigned char dp_scyl; /* starting cylinder */
334 unsigned char dp_typ; /* partition type */
335 unsigned char dp_ehd; /* end head */
336 unsigned char dp_esect; /* end sector */
337 unsigned char dp_ecyl; /* end cylinder */
338 u_int32_t dp_start; /* absolute starting sector number */
339 u_int32_t dp_size; /* partition size in sectors */
342 CTASSERT(sizeof (struct dos_partition) == 16);
346 #define DPSECT(s) ((s) & 0x3f) /* isolate relevant bits of sector */
347 #define DPCYL(c, s) ((c) + (((s) & 0xc0)<<2)) /* and those that are cylinder */
350 * Disklabel-specific ioctls.
352 * NB: <sys/disk.h> defines ioctls from 'd'/128 and up.
354 /* get and set disklabel */
355 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
356 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
357 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
358 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel)/* get virgin label */
360 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
365 * XXX encoding of disk minor numbers, should be elsewhere.
367 * See <sys/reboot.h> for a possibly better encoding.
369 * "cpio -H newc" can be used to back up device files with large minor
370 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats
371 * don't have enough bits, and cpio and tar don't notice the lossage.
372 * There are also some sign extension bugs.
377 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
378 _________________________________________________________________
379 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
380 -----------------------------------------------------------------
381 | SPARE |UNIT_2 | SLICE | MAJOR? | UNIT |PART |
382 -----------------------------------------------------------------
385 #define DKMAXUNIT 0x1ff
387 #define dkmakeminor(unit, slice, part) \
388 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
389 (((unit) & 0x1f) << 3) | (part))
390 #define dkpart(dev) (minor(dev) & 7)
391 #define dkslice(dev) ((minor(dev) >> 16) & 0x1f)
392 #define dksparebits(dev) ((minor(dev) >> 25) & 0x7f)
395 struct bio_queue_head;
397 int bounds_check_with_label(struct bio *bp, struct disklabel *lp,
399 void diskerr(struct bio *bp, char *what, int blkdone, struct disklabel *lp);
400 dev_t dkmodpart(dev_t dev, int part);
401 dev_t dkmodslice(dev_t dev, int slice);
402 u_int dkunit(dev_t dev);
403 char *readdisklabel(dev_t dev, struct disklabel *lp);
404 void bioqdisksort(struct bio_queue_head *ap, struct bio *bp);
405 int setdisklabel(struct disklabel *olp, struct disklabel *nlp,
407 int writedisklabel(dev_t dev, struct disklabel *lp);
410 void alpha_fix_srm_checksum(struct buf *bp);
418 struct disklabel *getdiskbyname(const char *);
422 #endif /* !_SYS_DISKLABEL_H_ */