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33 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
34 * $FreeBSD: src/sys/sys/disklabel.h,v 1.49.2.7 2001/05/27 05:58:26 jkh Exp $
35 * $DragonFly: src/sys/sys/disklabel.h,v 1.7 2004/06/02 19:31:02 dillon Exp $
38 #ifndef _SYS_DISKLABEL_H_
39 #define _SYS_DISKLABEL_H_
42 #include <sys/types.h>
44 #include <sys/ioccom.h>
48 * Disk description table, see disktab(5)
50 #define _PATH_DISKTAB "/etc/disktab"
51 #define DISKTAB "/etc/disktab" /* deprecated */
54 * Each disk has a label which includes information about the hardware
55 * disk geometry, filesystem partitions, and drive specific information.
56 * The label is in block 0 or 1, possibly offset from the beginning
57 * to leave room for a bootstrap, etc.
60 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
62 #define LABELSECTOR 1 /* sector containing label */
63 #define LABELOFFSET 0 /* offset of label in sector */
68 #define LABELOFFSET 64
72 #define LABELSECTOR 0 /* sector containing label */
76 #define LABELOFFSET 64 /* offset of label in sector */
79 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
81 #define MAXPARTITIONS 16
84 #define LABEL_PART 2 /* partition containing label */
85 #define RAW_PART 2 /* partition containing whole disk */
86 #define SWAP_PART 1 /* partition normally containing swap */
90 u_int32_t d_magic; /* the magic number */
91 u_int16_t d_type; /* drive type */
92 u_int16_t d_subtype; /* controller/d_type specific */
93 char d_typename[16]; /* type name, e.g. "eagle" */
96 * d_packname contains the pack identifier and is returned when
97 * the disklabel is read off the disk or in-core copy.
98 * d_boot0 and d_boot1 are the (optional) names of the
99 * primary (block 0) and secondary (block 1-15) bootstraps
100 * as found in /boot. These are returned when using
101 * getdiskbyname(3) to retrieve the values from /etc/disktab.
104 char un_d_packname[16]; /* pack identifier */
106 char *un_d_boot0; /* primary bootstrap name */
107 char *un_d_boot1; /* secondary bootstrap name */
110 #define d_packname d_un.un_d_packname
111 #define d_boot0 d_un.un_b.un_d_boot0
112 #define d_boot1 d_un.un_b.un_d_boot1
115 u_int32_t d_secsize; /* # of bytes per sector */
116 u_int32_t d_nsectors; /* # of data sectors per track */
117 u_int32_t d_ntracks; /* # of tracks per cylinder */
118 u_int32_t d_ncylinders; /* # of data cylinders per unit */
119 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
120 u_int32_t d_secperunit; /* # of data sectors per unit */
123 * Spares (bad sector replacements) below are not counted in
124 * d_nsectors or d_secpercyl. Spare sectors are assumed to
125 * be physical sectors which occupy space at the end of each
126 * track and/or cylinder.
128 u_int16_t d_sparespertrack; /* # of spare sectors per track */
129 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
131 * Alternate cylinders include maintenance, replacement, configuration
132 * description areas, etc.
134 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
136 /* hardware characteristics: */
138 * d_interleave, d_trackskew and d_cylskew describe perturbations
139 * in the media format used to compensate for a slow controller.
140 * Interleave is physical sector interleave, set up by the
141 * formatter or controller when formatting. When interleaving is
142 * in use, logically adjacent sectors are not physically
143 * contiguous, but instead are separated by some number of
144 * sectors. It is specified as the ratio of physical sectors
145 * traversed per logical sector. Thus an interleave of 1:1
146 * implies contiguous layout, while 2:1 implies that logical
147 * sector 0 is separated by one sector from logical sector 1.
148 * d_trackskew is the offset of sector 0 on track N relative to
149 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
150 * is the offset of sector 0 on cylinder N relative to sector 0
153 u_int16_t d_rpm; /* rotational speed */
154 u_int16_t d_interleave; /* hardware sector interleave */
155 u_int16_t d_trackskew; /* sector 0 skew, per track */
156 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
157 u_int32_t d_headswitch; /* head switch time, usec */
158 u_int32_t d_trkseek; /* track-to-track seek, usec */
159 u_int32_t d_flags; /* generic flags */
161 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
163 u_int32_t d_spare[NSPARE]; /* reserved for future use */
164 u_int32_t d_magic2; /* the magic number (again) */
165 u_int16_t d_checksum; /* xor of data incl. partitions */
167 /* filesystem and partition information: */
168 u_int16_t d_npartitions; /* number of partitions in following */
169 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
170 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
171 struct partition { /* the partition table */
172 u_int32_t p_size; /* number of sectors in partition */
173 u_int32_t p_offset; /* starting sector */
174 u_int32_t p_fsize; /* filesystem basic fragment size */
175 u_int8_t p_fstype; /* filesystem type, see below */
176 u_int8_t p_frag; /* filesystem fragments per block */
178 u_int16_t cpg; /* UFS: FS cylinders per group */
179 u_int16_t sgs; /* LFS: FS segment shift */
181 #define p_cpg __partition_u1.cpg
182 #define p_sgs __partition_u1.sgs
183 } d_partitions[MAXPARTITIONS]; /* actually may be more */
186 static u_int16_t dkcksum(struct disklabel *lp);
188 static __inline u_int16_t
189 dkcksum(struct disklabel *lp)
191 u_int16_t *start, *end;
194 start = (u_int16_t *)lp;
195 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
203 * offsets for asm boot files.
211 .set d_end_,276 /* size of disk label */
215 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
216 #define DTYPE_MSCP 2 /* MSCP */
217 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
218 #define DTYPE_SCSI 4 /* SCSI */
219 #define DTYPE_ESDI 5 /* ESDI interface */
220 #define DTYPE_ST506 6 /* ST506 etc. */
221 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
222 #define DTYPE_HPFL 8 /* HP Fiber-link */
223 #define DTYPE_FLOPPY 10 /* floppy */
224 #define DTYPE_CCD 11 /* concatenated disk */
225 #define DTYPE_VINUM 12 /* vinum volume */
226 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
228 #if defined(PC98) && !defined(PC98_ATCOMPAT)
229 #define DSTYPE_SEC256 0x80 /* physical sector size=256 */
233 static char *dktypenames[] = {
250 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
254 * Filesystem type and version.
255 * Used to interpret other filesystem-specific
256 * per-partition information.
258 #define FS_UNUSED 0 /* unused */
259 #define FS_SWAP 1 /* swap */
260 #define FS_V6 2 /* Sixth Edition */
261 #define FS_V7 3 /* Seventh Edition */
262 #define FS_SYSV 4 /* System V */
263 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
264 #define FS_V8 6 /* Eighth Edition, 4K blocks */
265 #define FS_BSDFFS 7 /* 4.2BSD fast file system */
266 #define FS_MSDOS 8 /* MSDOS file system */
267 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
268 #define FS_OTHER 10 /* in use, but unknown/unsupported */
269 #define FS_HPFS 11 /* OS/2 high-performance file system */
270 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
271 #define FS_BOOT 13 /* partition contains bootstrap */
272 #define FS_VINUM 14 /* Vinum drive */
275 static char *fstypenames[] = {
293 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
297 * flags shared by various drives:
299 #define D_REMOVABLE 0x01 /* removable media */
300 #define D_ECC 0x02 /* supports ECC */
301 #define D_BADSECT 0x04 /* supports bad sector forw. */
302 #define D_RAMDISK 0x08 /* disk emulator */
303 #define D_CHAIN 0x10 /* can do back-back transfers */
306 * Drive data for SMD.
308 #define d_smdflags d_drivedata[0]
309 #define D_SSE 0x1 /* supports skip sectoring */
310 #define d_mindist d_drivedata[1]
311 #define d_maxdist d_drivedata[2]
312 #define d_sdist d_drivedata[3]
315 * Drive data for ST506.
317 #define d_precompcyl d_drivedata[0]
318 #define d_gap3 d_drivedata[1] /* used only when formatting */
321 * Drive data for SCSI.
323 #define d_blind d_drivedata[0]
327 * Structure used to perform a format or other raw operation, returning
328 * data and/or register values. Register identification and format
329 * are device- and driver-dependent.
333 int df_count; /* value-result */
335 int df_reg[8]; /* result */
339 * Structure used internally to retrieve information about a partition
343 struct disklabel *disklab;
344 struct partition *part;
348 * Disk-specific ioctls.
350 /* get and set disklabel; DIOCGPART used internally */
351 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
352 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
353 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
354 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
355 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */
357 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
362 * XXX encoding of disk minor numbers, should be elsewhere.
364 * See <sys/reboot.h> for a possibly better encoding.
366 * "cpio -H newc" can be used to back up device files with large minor
367 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats
368 * don't have enough bits, and cpio and tar don't notice the lossage.
369 * There are also some sign extension bugs.
374 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
375 _________________________________________________________________
376 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
377 -----------------------------------------------------------------
378 | TYPE |UNIT_2 |P| SLICE | MAJOR? | UNIT |PART |
379 -----------------------------------------------------------------
382 #define DKMAXUNIT 0x1ff /* Highest disk unit number */
384 #define dkmakeminor(unit, slice, part) \
385 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
386 (((unit) & 0x1f) << 3) | (part & 7) | \
387 ((part & 0x08) << 17))
389 static __inline u_int
395 static __inline u_int
398 return(dkmakeminor(unit, 0, 0));
401 static __inline dev_t
402 dkmodpart(dev_t dev, int part)
409 val = (part & 7) | 0x100000;
410 return (make_sub_dev(dev, (minor(dev) & ~0x100007) | val));
413 static __inline dev_t
414 dkmodslice(dev_t dev, int slice)
416 return (make_sub_dev(dev, (minor(dev) & ~0x0f0000) | (slice << 16)));
422 return (((minor(dev) >> 17) & 0x08) | (minor(dev) & 7));
425 #define dkslice(dev) ((minor(dev) >> 16) & 0x0f)
426 #define dktype(dev) ((minor(dev) >> 25) & 0x7f)
428 static __inline u_int
431 return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f));
435 struct buf_queue_head;
437 int bounds_check_with_label (struct buf *bp, struct disklabel *lp,
439 void diskerr (struct buf *bp, dev_t dev, char *what, int pri, int blkdone,
440 struct disklabel *lp);
441 void disksort (struct buf *ap, struct buf *bp);
442 char *readdisklabel (dev_t dev, struct disklabel *lp);
443 void bufqdisksort (struct buf_queue_head *ap, struct buf *bp);
444 int setdisklabel (struct disklabel *olp, struct disklabel *nlp,
446 int writedisklabel (dev_t dev, struct disklabel *lp);
448 void alpha_fix_srm_checksum (struct buf *bp);
457 struct disklabel *getdiskbyname (const char *);
461 #endif /* !_SYS_DISKLABEL_H_ */