Annotation of sys/sys/disklabel.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: disklabel.h,v 1.39 2007/07/11 04:50:43 miod Exp $ */
2: /* $NetBSD: disklabel.h,v 1.41 1996/05/10 23:07:37 mark Exp $ */
3:
4: /*
5: * Copyright (c) 1987, 1988, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the University nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: *
32: * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
33: */
34:
35: /*
36: * Disk description table, see disktab(5)
37: */
38: #define _PATH_DISKTAB "/etc/disktab"
39: #define DISKTAB "/etc/disktab" /* deprecated */
40:
41: /*
42: * Each disk has a label which includes information about the hardware
43: * disk geometry, filesystem partitions, and drive specific information.
44: * The location of the label, as well as the number of partitions the
45: * label can describe and the number of the "whole disk" (raw)
46: * paritition are machine dependent.
47: */
48: #include <machine/disklabel.h>
49:
50: /*
51: * The absolute maximum number of disk partitions allowed.
52: * This is the maximum value of MAXPARTITIONS for which 'struct disklabel'
53: * is <= DEV_BSIZE bytes long. If MAXPARTITIONS is greater than this, beware.
54: */
55: #define MAXMAXPARTITIONS 22
56: #if MAXPARTITIONS > MAXMAXPARTITIONS
57: #warn beware: MAXPARTITIONS bigger than MAXMAXPARTITIONS
58: #endif
59:
60: /*
61: * Translate between device numbers and major/disk unit/disk partition.
62: */
63: #define DISKUNIT(dev) (minor(dev) / MAXPARTITIONS)
64: #define DISKPART(dev) (minor(dev) % MAXPARTITIONS)
65: #define RAW_PART 2 /* 'c' partition */
66: #define DISKMINOR(unit, part) \
67: (((unit) * MAXPARTITIONS) + (part))
68: #define MAKEDISKDEV(maj, unit, part) \
69: (makedev((maj), DISKMINOR((unit), (part))))
70: #define DISKLABELDEV(dev) \
71: (MAKEDISKDEV(major(dev), DISKUNIT(dev), RAW_PART))
72:
73: #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
74:
75: #define MAXDISKSIZE 0x1fffffffffffLL /* 47 bits of reach */
76:
77: #ifndef _LOCORE
78: struct disklabel {
79: u_int32_t d_magic; /* the magic number */
80: u_int16_t d_type; /* drive type */
81: u_int16_t d_subtype; /* controller/d_type specific */
82: char d_typename[16]; /* type name, e.g. "eagle" */
83:
84: /*
85: * d_packname contains the pack identifier and is returned when
86: * the disklabel is read off the disk or in-core copy.
87: * d_boot0 and d_boot1 are the (optional) names of the
88: * primary (block 0) and secondary (block 1-15) bootstraps
89: * as found in /usr/mdec. These are returned when using
90: * getdiskbyname(3) to retrieve the values from /etc/disktab.
91: */
92: union {
93: char un_d_packname[16]; /* pack identifier */
94: struct {
95: char *un_d_boot0; /* primary bootstrap name */
96: char *un_d_boot1; /* secondary bootstrap name */
97: } un_b;
98: } d_un;
99: #define d_packname d_un.un_d_packname
100: #define d_boot0 d_un.un_b.un_d_boot0
101: #define d_boot1 d_un.un_b.un_d_boot1
102:
103: /* disk geometry: */
104: u_int32_t d_secsize; /* # of bytes per sector */
105: u_int32_t d_nsectors; /* # of data sectors per track */
106: u_int32_t d_ntracks; /* # of tracks per cylinder */
107: u_int32_t d_ncylinders; /* # of data cylinders per unit */
108: u_int32_t d_secpercyl; /* # of data sectors per cylinder */
109: u_int32_t d_secperunit; /* # of data sectors per unit */
110:
111: /*
112: * Spares (bad sector replacements) below are not counted in
113: * d_nsectors or d_secpercyl. Spare sectors are assumed to
114: * be physical sectors which occupy space at the end of each
115: * track and/or cylinder.
116: */
117: u_int16_t d_sparespertrack; /* # of spare sectors per track */
118: u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
119: /*
120: * Alternate cylinders include maintenance, replacement, configuration
121: * description areas, etc.
122: */
123: u_int32_t d_acylinders; /* # of alt. cylinders per unit */
124:
125: /* hardware characteristics: */
126: /*
127: * d_interleave, d_trackskew and d_cylskew describe perturbations
128: * in the media format used to compensate for a slow controller.
129: * Interleave is physical sector interleave, set up by the
130: * formatter or controller when formatting. When interleaving is
131: * in use, logically adjacent sectors are not physically
132: * contiguous, but instead are separated by some number of
133: * sectors. It is specified as the ratio of physical sectors
134: * traversed per logical sector. Thus an interleave of 1:1
135: * implies contiguous layout, while 2:1 implies that logical
136: * sector 0 is separated by one sector from logical sector 1.
137: * d_trackskew is the offset of sector 0 on track N relative to
138: * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
139: * is the offset of sector 0 on cylinder N relative to sector 0
140: * on cylinder N-1.
141: */
142: u_int16_t d_rpm; /* rotational speed */
143: u_int16_t d_interleave; /* hardware sector interleave */
144: u_int16_t d_trackskew; /* sector 0 skew, per track */
145: u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
146: u_int32_t d_headswitch; /* head switch time, usec */
147: u_int32_t d_trkseek; /* track-to-track seek, usec */
148: u_int32_t d_flags; /* generic flags */
149: #define NDDATA 5
150: u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
151: u_int16_t d_secperunith; /* # of data sectors (high part) */
152: u_int16_t d_version; /* version # (1=48 bit addressing) */
153: #define NSPARE 4
154: u_int32_t d_spare[NSPARE]; /* reserved for future use */
155: u_int32_t d_magic2; /* the magic number (again) */
156: u_int16_t d_checksum; /* xor of data incl. partitions */
157:
158: /* filesystem and partition information: */
159: u_int16_t d_npartitions; /* number of partitions in following */
160: u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
161: u_int32_t d_sbsize; /* max size of fs superblock, bytes */
162: struct partition { /* the partition table */
163: u_int32_t p_size; /* number of sectors in partition */
164: u_int32_t p_offset; /* starting sector */
165: u_int16_t p_offseth; /* starting sector (high part) */
166: u_int16_t p_sizeh; /* number of sectors (high part) */
167: u_int8_t p_fstype; /* filesystem type, see below */
168: u_int8_t p_fragblock; /* encoded filesystem frag/block */
169: u_int16_t p_cpg; /* UFS: FS cylinders per group */
170: } d_partitions[MAXPARTITIONS]; /* actually may be more */
171: };
172:
173:
174: struct __partitionv0 { /* the partition table */
175: u_int32_t p_size; /* number of sectors in partition */
176: u_int32_t p_offset; /* starting sector */
177: u_int32_t p_fsize; /* filesystem basic fragment size */
178: u_int8_t p_fstype; /* filesystem type, see below */
179: u_int8_t p_frag; /* filesystem fragments per block */
180: union {
181: u_int16_t cpg; /* UFS: FS cylinders per group */
182: u_int16_t sgs; /* LFS: FS segment shift */
183: } __partitionv0_u1;
184: };
185:
186: #else /* _LOCORE */
187: /*
188: * offsets for asm boot files.
189: */
190: .set d_secsize,40
191: .set d_nsectors,44
192: .set d_ntracks,48
193: .set d_ncylinders,52
194: .set d_secpercyl,56
195: .set d_secperunit,60
196: .set d_end_,404 /* size of disk label */
197: #endif /* _LOCORE */
198:
199:
200: #define DISKLABELV1_FFS_FRAGBLOCK(fsize, frag) \
201: ((fsize) * (frag) == 0 ? 0 : \
202: (((ffs((fsize) * (frag)) - 13) << 3) | (ffs(frag))))
203:
204: #define DISKLABELV1_FFS_BSIZE(i) ((i) == 0 ? 0 : (1 << (((i) >> 3) + 12)))
205: #define DISKLABELV1_FFS_FRAG(i) ((i) == 0 ? 0 : (1 << (((i) & 0x07) - 1)))
206: #define DISKLABELV1_FFS_FSIZE(i) (DISKLABELV1_FFS_FRAG(i) == 0 ? 0 : \
207: (DISKLABELV1_FFS_BSIZE(i) / DISKLABELV1_FFS_FRAG(i)))
208:
209: #define DL_GETPSIZE(p) (((u_int64_t)(p)->p_sizeh << 32) + (p)->p_size)
210: #define DL_GETPOFFSET(p) (((u_int64_t)(p)->p_offseth << 32) + (p)->p_offset)
211: #define DL_GETDSIZE(d) (((u_int64_t)(d)->d_secperunith << 32) + \
212: (d)->d_secperunit)
213:
214: #define DL_SETPSIZE(p, n) do { \
215: daddr64_t x = (n); \
216: (p)->p_sizeh = x >> 32; \
217: (p)->p_size = x; \
218: } while (0)
219: #define DL_SETPOFFSET(p, n) do { \
220: daddr64_t x = (n); \
221: (p)->p_offseth = x >> 32; \
222: (p)->p_offset = x; \
223: } while (0)
224: #define DL_SETDSIZE(d, n) do { \
225: daddr64_t x = (n); \
226: (d)->d_secperunith = x >> 32; \
227: (d)->d_secperunit = x; \
228: } while (0)
229:
230: /* d_type values: */
231: #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
232: #define DTYPE_MSCP 2 /* MSCP */
233: #define DTYPE_DEC 3 /* other DEC (rk, rl) */
234: #define DTYPE_SCSI 4 /* SCSI */
235: #define DTYPE_ESDI 5 /* ESDI interface */
236: #define DTYPE_ST506 6 /* ST506 etc. */
237: #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
238: #define DTYPE_HPFL 8 /* HP Fiber-link */
239: #define DTYPE_FLOPPY 10 /* floppy */
240: #define DTYPE_CCD 11 /* concatenated disk device */
241: #define DTYPE_VND 12 /* vnode pseudo-disk */
242: #define DTYPE_ATAPI 13 /* ATAPI */
243: #define DTYPE_RAID 14 /* RAIDframe */
244:
245: #ifdef DKTYPENAMES
246: static char *dktypenames[] = {
247: "unknown",
248: "SMD",
249: "MSCP",
250: "old DEC",
251: "SCSI",
252: "ESDI",
253: "ST506",
254: "HP-IB",
255: "HP-FL",
256: "type 9",
257: "floppy",
258: "ccd",
259: "vnd",
260: "ATAPI",
261: "RAID",
262: NULL
263: };
264: #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
265: #endif
266:
267: /*
268: * Filesystem type and version.
269: * Used to interpret other filesystem-specific
270: * per-partition information.
271: */
272: #define FS_UNUSED 0 /* unused */
273: #define FS_SWAP 1 /* swap */
274: #define FS_V6 2 /* Sixth Edition */
275: #define FS_V7 3 /* Seventh Edition */
276: #define FS_SYSV 4 /* System V */
277: #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
278: #define FS_V8 6 /* Eighth Edition, 4K blocks */
279: #define FS_BSDFFS 7 /* 4.2BSD fast file system */
280: #define FS_MSDOS 8 /* MSDOS file system */
281: #define FS_BSDLFS 9 /* 4.4BSD log-structured file system */
282: #define FS_OTHER 10 /* in use, but unknown/unsupported */
283: #define FS_HPFS 11 /* OS/2 high-performance file system */
284: #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
285: #define FS_BOOT 13 /* partition contains bootstrap */
286: #define FS_ADOS 14 /* AmigaDOS fast file system */
287: #define FS_HFS 15 /* Macintosh HFS */
288: #define FS_ADFS 16 /* Acorn Disk Filing System */
289: #define FS_EXT2FS 17 /* ext2fs */
290: #define FS_CCD 18 /* ccd component */
291: #define FS_RAID 19 /* RAIDframe */
292: #define FS_NTFS 20 /* Windows/NT file system */
293: #define FS_UDF 21 /* UDF (DVD) filesystem */
294:
295: #ifdef DKTYPENAMES
296: static char *fstypenames[] = {
297: "unused",
298: "swap",
299: "Version6",
300: "Version7",
301: "SystemV",
302: "4.1BSD",
303: "Eighth-Edition",
304: "4.2BSD",
305: "MSDOS",
306: "4.4LFS",
307: "unknown",
308: "HPFS",
309: "ISO9660",
310: "boot",
311: "ADOS",
312: "HFS",
313: "ADFS",
314: "ext2fs",
315: "ccd",
316: "RAID",
317: "NTFS",
318: "UDF",
319: NULL
320: };
321:
322: /* Similar to the above, but used for things like the mount command. */
323: static char *fstypesnames[] = {
324: "", /* 0 */
325: "", /* 1 */
326: "", /* 2 */
327: "", /* 3 */
328: "", /* 4 */
329: "", /* 5 */
330: "", /* 6 */
331: "ffs", /* 7 */
332: "msdos", /* 8 */
333: "lfs", /* 9 */
334: "", /* 10 */
335: "", /* 11 */
336: "cd9660", /* 12 */
337: "", /* 13 */
338: "ados", /* 14 */
339: "", /* 15 */
340: "", /* 16 */
341: "ext2fs", /* 17 */
342: "", /* 18 */
343: "", /* 19 */
344: "ntfs", /* 20 */
345: "udf", /* 21 */
346: NULL
347: };
348:
349: #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
350: #endif
351:
352: /*
353: * flags shared by various drives:
354: */
355: #define D_BADSECT 0x04 /* supports bad sector forw. */
356: #define D_VENDOR 0x08 /* vendor disklabel */
357:
358: /*
359: * Drive data for SMD.
360: */
361: #define d_smdflags d_drivedata[0]
362: #define D_SSE 0x1 /* supports skip sectoring */
363: #define d_mindist d_drivedata[1]
364: #define d_maxdist d_drivedata[2]
365: #define d_sdist d_drivedata[3]
366:
367: /*
368: * Drive data for ST506.
369: */
370: #define d_precompcyl d_drivedata[0]
371: #define d_gap3 d_drivedata[1] /* used only when formatting */
372:
373: /*
374: * Drive data for SCSI.
375: */
376: #define d_blind d_drivedata[0]
377:
378: #ifndef _LOCORE
379: /*
380: * Structure used to perform a format or other raw operation, returning
381: * data and/or register values. Register identification and format
382: * are device- and driver-dependent.
383: */
384: struct format_op {
385: char *df_buf;
386: int df_count; /* value-result */
387: daddr64_t df_startblk;
388: int df_reg[8]; /* result */
389: };
390:
391: /*
392: * Structure used internally to retrieve information about a partition
393: * on a disk.
394: */
395: struct partinfo {
396: struct disklabel *disklab;
397: struct partition *part;
398: };
399:
400: /* DOS partition table -- located at start of some disks. */
401: #define DOS_LABELSECTOR 1
402: #define DOSBBSECTOR 0 /* DOS boot block relative sector # */
403: #define DOSPARTOFF 446
404: #define DOSDISKOFF 444
405: #define NDOSPART 4
406: #define DOSACTIVE 0x80 /* active partition */
407:
408: #define DOSMBR_SIGNATURE (0xaa55)
409: #define DOSMBR_SIGNATURE_OFF (0x1fe)
410:
411: struct dos_partition {
412: u_int8_t dp_flag; /* bootstrap flags */
413: u_int8_t dp_shd; /* starting head */
414: u_int8_t dp_ssect; /* starting sector */
415: u_int8_t dp_scyl; /* starting cylinder */
416: u_int8_t dp_typ; /* partition type (see below) */
417: u_int8_t dp_ehd; /* end head */
418: u_int8_t dp_esect; /* end sector */
419: u_int8_t dp_ecyl; /* end cylinder */
420: u_int32_t dp_start; /* absolute starting sector number */
421: u_int32_t dp_size; /* partition size in sectors */
422: };
423:
424: /* Isolate the relevant bits to get sector and cylinder. */
425: #define DPSECT(s) ((s) & 0x3f)
426: #define DPCYL(c, s) ((c) + (((s) & 0xc0) << 2))
427:
428: /* Known DOS partition types. */
429: #define DOSPTYP_UNUSED 0x00 /* Unused partition */
430: #define DOSPTYP_FAT12 0x01 /* 12-bit FAT */
431: #define DOSPTYP_FAT16S 0x04 /* 16-bit FAT, less than 32M */
432: #define DOSPTYP_EXTEND 0x05 /* Extended; contains sub-partitions */
433: #define DOSPTYP_FAT16B 0x06 /* 16-bit FAT, more than 32M */
434: #define DOSPTYP_FAT32 0x0b /* 32-bit FAT */
435: #define DOSPTYP_FAT32L 0x0c /* 32-bit FAT, LBA-mapped */
436: #define DOSPTYP_FAT16L 0x0e /* 16-bit FAT, LBA-mapped */
437: #define DOSPTYP_EXTENDL 0x0f /* Extended, LBA-mapped; (sub-partitions) */
438: #define DOSPTYP_ONTRACK 0x54
439: #define DOSPTYP_LINUX 0x83 /* That other thing */
440: #define DOSPTYP_FREEBSD 0xa5 /* FreeBSD partition type */
441: #define DOSPTYP_OPENBSD 0xa6 /* OpenBSD partition type */
442: #define DOSPTYP_NETBSD 0xa9 /* NetBSD partition type */
443:
444: struct dos_mbr {
445: u_int8_t dmbr_boot[DOSPARTOFF];
446: struct dos_partition dmbr_parts[NDOSPART];
447: u_int16_t dmbr_sign;
448: } __packed;
449:
450: #ifdef _KERNEL
451: void diskerr(struct buf *, char *, char *, int, int, struct disklabel *);
452: void disksort(struct buf *, struct buf *);
453: u_int dkcksum(struct disklabel *);
454: char *initdisklabel(struct disklabel *);
455: char *checkdisklabel(void *, struct disklabel *);
456: int setdisklabel(struct disklabel *, struct disklabel *, u_int);
457: char *readdisklabel(dev_t, void (*)(struct buf *), struct disklabel *, int);
458: int writedisklabel(dev_t, void (*)(struct buf *), struct disklabel *);
459: int bounds_check_with_label(struct buf *, struct disklabel *, int);
460: char *readdoslabel(struct buf *, void (*)(struct buf *),
461: struct disklabel *, int *, int);
462: #ifdef CD9660
463: int iso_disklabelspoof(dev_t dev, void (*strat)(struct buf *),
464: struct disklabel *lp);
465: #endif
466: #ifdef UDF
467: int udf_disklabelspoof(dev_t dev, void (*strat)(struct buf *),
468: struct disklabel *lp);
469: #endif
470: #endif
471: #endif /* _LOCORE */
472:
473: #if !defined(_KERNEL) && !defined(_LOCORE)
474:
475: #include <sys/cdefs.h>
476:
477: __BEGIN_DECLS
478: struct disklabel *getdiskbyname(const char *);
479: __END_DECLS
480:
481: #endif
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