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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 1.11 2005/04/30 23:04:21 swildner 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 */
67 #define LABELSECTOR 0 /* sector containing label */
71 #define LABELOFFSET 64 /* offset of label in sector */
74 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
76 #define MAXPARTITIONS 16
79 #define LABEL_PART 2 /* partition containing label */
80 #define RAW_PART 2 /* partition containing whole disk */
81 #define SWAP_PART 1 /* partition normally containing swap */
85 u_int32_t d_magic; /* the magic number */
86 u_int16_t d_type; /* drive type */
87 u_int16_t d_subtype; /* controller/d_type specific */
88 char d_typename[16]; /* type name, e.g. "eagle" */
91 * d_packname contains the pack identifier and is returned when
92 * the disklabel is read off the disk or in-core copy.
93 * d_boot0 and d_boot1 are the (optional) names of the
94 * primary (block 0) and secondary (block 1-15) bootstraps
95 * as found in /boot. These are returned when using
96 * getdiskbyname(3) to retrieve the values from /etc/disktab.
99 char un_d_packname[16]; /* pack identifier */
101 char *un_d_boot0; /* primary bootstrap name */
102 char *un_d_boot1; /* secondary bootstrap name */
105 #define d_packname d_un.un_d_packname
106 #define d_boot0 d_un.un_b.un_d_boot0
107 #define d_boot1 d_un.un_b.un_d_boot1
110 u_int32_t d_secsize; /* # of bytes per sector */
111 u_int32_t d_nsectors; /* # of data sectors per track */
112 u_int32_t d_ntracks; /* # of tracks per cylinder */
113 u_int32_t d_ncylinders; /* # of data cylinders per unit */
114 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
115 u_int32_t d_secperunit; /* # of data sectors per unit */
118 * Spares (bad sector replacements) below are not counted in
119 * d_nsectors or d_secpercyl. Spare sectors are assumed to
120 * be physical sectors which occupy space at the end of each
121 * track and/or cylinder.
123 u_int16_t d_sparespertrack; /* # of spare sectors per track */
124 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
126 * Alternate cylinders include maintenance, replacement, configuration
127 * description areas, etc.
129 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
131 /* hardware characteristics: */
133 * d_interleave, d_trackskew and d_cylskew describe perturbations
134 * in the media format used to compensate for a slow controller.
135 * Interleave is physical sector interleave, set up by the
136 * formatter or controller when formatting. When interleaving is
137 * in use, logically adjacent sectors are not physically
138 * contiguous, but instead are separated by some number of
139 * sectors. It is specified as the ratio of physical sectors
140 * traversed per logical sector. Thus an interleave of 1:1
141 * implies contiguous layout, while 2:1 implies that logical
142 * sector 0 is separated by one sector from logical sector 1.
143 * d_trackskew is the offset of sector 0 on track N relative to
144 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
145 * is the offset of sector 0 on cylinder N relative to sector 0
148 u_int16_t d_rpm; /* rotational speed */
149 u_int16_t d_interleave; /* hardware sector interleave */
150 u_int16_t d_trackskew; /* sector 0 skew, per track */
151 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
152 u_int32_t d_headswitch; /* head switch time, usec */
153 u_int32_t d_trkseek; /* track-to-track seek, usec */
154 u_int32_t d_flags; /* generic flags */
156 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
158 u_int32_t d_spare[NSPARE]; /* reserved for future use */
159 u_int32_t d_magic2; /* the magic number (again) */
160 u_int16_t d_checksum; /* xor of data incl. partitions */
162 /* filesystem and partition information: */
163 u_int16_t d_npartitions; /* number of partitions in following */
164 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
165 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
166 struct partition { /* the partition table */
167 u_int32_t p_size; /* number of sectors in partition */
168 u_int32_t p_offset; /* starting sector */
169 u_int32_t p_fsize; /* filesystem basic fragment size */
170 u_int8_t p_fstype; /* filesystem type, see below */
171 u_int8_t p_frag; /* filesystem fragments per block */
173 u_int16_t cpg; /* UFS: FS cylinders per group */
174 u_int16_t sgs; /* LFS: FS segment shift */
176 #define p_cpg __partition_u1.cpg
177 #define p_sgs __partition_u1.sgs
178 } d_partitions[MAXPARTITIONS]; /* actually may be more */
181 static u_int16_t dkcksum(struct disklabel *lp);
183 static __inline u_int16_t
184 dkcksum(struct disklabel *lp)
186 u_int16_t *start, *end;
189 start = (u_int16_t *)lp;
190 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
198 * offsets for asm boot files.
206 .set d_end_,276 /* size of disk label */
210 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
211 #define DTYPE_MSCP 2 /* MSCP */
212 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
213 #define DTYPE_SCSI 4 /* SCSI */
214 #define DTYPE_ESDI 5 /* ESDI interface */
215 #define DTYPE_ST506 6 /* ST506 etc. */
216 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
217 #define DTYPE_HPFL 8 /* HP Fiber-link */
218 #define DTYPE_FLOPPY 10 /* floppy */
219 #define DTYPE_CCD 11 /* concatenated disk */
220 #define DTYPE_VINUM 12 /* vinum volume */
221 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
224 static const char *dktypenames[] = {
241 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
245 * Filesystem type and version.
246 * Used to interpret other filesystem-specific
247 * per-partition information.
249 #define FS_UNUSED 0 /* unused */
250 #define FS_SWAP 1 /* swap */
251 #define FS_V6 2 /* Sixth Edition */
252 #define FS_V7 3 /* Seventh Edition */
253 #define FS_SYSV 4 /* System V */
254 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
255 #define FS_V8 6 /* Eighth Edition, 4K blocks */
256 #define FS_BSDFFS 7 /* 4.2BSD fast file system */
257 #define FS_MSDOS 8 /* MSDOS file system */
258 #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
259 #define FS_OTHER 10 /* in use, but unknown/unsupported */
260 #define FS_HPFS 11 /* OS/2 high-performance file system */
261 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
262 #define FS_BOOT 13 /* partition contains bootstrap */
263 #define FS_VINUM 14 /* Vinum drive */
266 static const char *fstypenames[] = {
284 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
288 * flags shared by various drives:
290 #define D_REMOVABLE 0x01 /* removable media */
291 #define D_ECC 0x02 /* supports ECC */
292 #define D_BADSECT 0x04 /* supports bad sector forw. */
293 #define D_RAMDISK 0x08 /* disk emulator */
294 #define D_CHAIN 0x10 /* can do back-back transfers */
297 * Drive data for SMD.
299 #define d_smdflags d_drivedata[0]
300 #define D_SSE 0x1 /* supports skip sectoring */
301 #define d_mindist d_drivedata[1]
302 #define d_maxdist d_drivedata[2]
303 #define d_sdist d_drivedata[3]
306 * Drive data for ST506.
308 #define d_precompcyl d_drivedata[0]
309 #define d_gap3 d_drivedata[1] /* used only when formatting */
312 * Drive data for SCSI.
314 #define d_blind d_drivedata[0]
318 * Structure used to perform a format or other raw operation, returning
319 * data and/or register values. Register identification and format
320 * are device- and driver-dependent.
324 int df_count; /* value-result */
326 int df_reg[8]; /* result */
330 * Structure used internally to retrieve information about a partition
334 struct disklabel *disklab;
335 struct partition *part;
339 * Disk-specific ioctls.
341 /* get and set disklabel; DIOCGPART used internally */
342 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
343 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
344 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
345 #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
346 #define DIOCGDVIRGIN _IOR('d', 105, struct disklabel) /* get virgin label */
348 #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
353 * XXX encoding of disk minor numbers, should be elsewhere.
355 * See <sys/reboot.h> for a possibly better encoding.
357 * "cpio -H newc" can be used to back up device files with large minor
358 * numbers (but not ones >= 2^31). Old cpio formats and all tar formats
359 * don't have enough bits, and cpio and tar don't notice the lossage.
360 * There are also some sign extension bugs.
365 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
366 _________________________________________________________________
367 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
368 -----------------------------------------------------------------
369 | TYPE |UNIT_2 |P| SLICE | MAJOR? | UNIT |PART |
370 -----------------------------------------------------------------
373 #define DKMAXUNIT 0x1ff /* Highest disk unit number */
375 #define dkmakeminor(unit, slice, part) \
376 (((slice) << 16) | (((unit) & 0x1e0) << 16) | \
377 (((unit) & 0x1f) << 3) | (part & 7) | \
378 ((part & 0x08) << 17))
380 static __inline u_int
386 static __inline u_int
389 return(dkmakeminor(unit, 0, 0));
392 static __inline dev_t
393 dkmodpart(dev_t dev, int part)
400 val = (part & 7) | 0x100000;
401 return (make_sub_dev(dev, (minor(dev) & ~0x100007) | val));
404 static __inline dev_t
405 dkmodslice(dev_t dev, int slice)
407 return (make_sub_dev(dev, (minor(dev) & ~0x0f0000) | (slice << 16)));
413 return (((minor(dev) >> 17) & 0x08) | (minor(dev) & 7));
416 #define dkslice(dev) ((minor(dev) >> 16) & 0x0f)
417 #define dktype(dev) ((minor(dev) >> 25) & 0x7f)
419 static __inline u_int
422 return (((minor(dev) >> 16) & 0x1e0) | ((minor(dev) >> 3) & 0x1f));
426 struct buf_queue_head;
428 int bounds_check_with_label (struct buf *bp, struct disklabel *lp,
430 void diskerr (struct buf *bp, dev_t dev, char *what, int pri, int blkdone,
431 struct disklabel *lp);
432 void disksort (struct buf *ap, struct buf *bp);
433 char *readdisklabel (dev_t dev, struct disklabel *lp);
434 void bufqdisksort (struct buf_queue_head *ap, struct buf *bp);
435 int setdisklabel (struct disklabel *olp, struct disklabel *nlp,
437 int writedisklabel (dev_t dev, struct disklabel *lp);
445 struct disklabel *getdiskbyname (const char *);
449 #endif /* !_SYS_DISKLABEL_H_ */