FreeBSD/Linux Kernel Cross Reference
sys/sys/disklabel.h
1 /*
2 * Copyright (c) 1987, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94
34 * $FreeBSD: releng/5.1/sys/sys/disklabel.h 114556 2003-05-02 22:46:13Z phk $
35 */
36
37 #ifndef _SYS_DISKLABEL_H_
38 #define _SYS_DISKLABEL_H_
39
40 #ifndef _KERNEL
41 #include <sys/types.h>
42 #endif
43 #include <sys/ioccom.h>
44
45 /*
46 * Disk description table, see disktab(5)
47 */
48 #define _PATH_DISKTAB "/etc/disktab"
49
50 /*
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.
55 */
56
57 /* XXX these should be defined per controller (or drive) elsewhere, not here! */
58 #ifdef __i386__
59 #define LABELSECTOR 1 /* sector containing label */
60 #define LABELOFFSET 0 /* offset of label in sector */
61 #endif
62
63 #ifdef __alpha__
64 #define LABELSECTOR 0
65 #define LABELOFFSET 64
66 #endif
67
68 #ifdef __ia64__
69 #define LABELSECTOR 1
70 #define LABELOFFSET 0
71 #endif
72
73 #ifdef __sparc64__
74 #define LABELSECTOR 0
75 #define LABELOFFSET 128
76 #endif
77
78 #ifndef LABELSECTOR
79 #define LABELSECTOR 0
80 #endif
81
82 #ifndef LABELOFFSET
83 #define LABELOFFSET 64
84 #endif
85
86 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
87 #ifndef MAXPARTITIONS
88 #define MAXPARTITIONS 8
89 #endif
90
91 /* Size of bootblock area in sector-size neutral bytes */
92 #define BBSIZE 8192
93
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 */
97
98 struct disklabel {
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" */
103
104 char d_packname[16]; /* pack identifier */
105
106 /* disk geometry: */
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 */
113
114 /*
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.
119 */
120 u_int16_t d_sparespertrack; /* # of spare sectors per track */
121 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
122 /*
123 * Alternate cylinders include maintenance, replacement, configuration
124 * description areas, etc.
125 */
126 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
127
128 /* hardware characteristics: */
129 /*
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
143 * on cylinder N-1.
144 */
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 */
152 #define NDDATA 5
153 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
154 #define NSPARE 5
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 */
158
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 */
171 };
172
173 #ifdef CTASSERT
174 CTASSERT(sizeof(struct disklabel) == 148 + MAXPARTITIONS * 16);
175 #endif
176
177 static __inline u_int16_t dkcksum(struct disklabel *lp);
178 static __inline u_int16_t
179 dkcksum(struct disklabel *lp)
180 {
181 u_int16_t *start, *end;
182 u_int16_t sum = 0;
183
184 start = (u_int16_t *)lp;
185 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
186 while (start < end)
187 sum ^= *start++;
188 return (sum);
189 }
190
191
192 /* d_type values: */
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_RAID 14 /* CMU RAIDFrame */
206 #define DTYPE_JFS2 16 /* IBM JFS 2 */
207
208 #ifdef DKTYPENAMES
209 static const char *dktypenames[] = {
210 "unknown",
211 "SMD",
212 "MSCP",
213 "old DEC",
214 "SCSI",
215 "ESDI",
216 "ST506",
217 "HP-IB",
218 "HP-FL",
219 "type 9",
220 "floppy",
221 "CCD",
222 "Vinum",
223 "DOC2K",
224 "Raid",
225 "?",
226 "jfs",
227 NULL
228 };
229 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
230 #endif
231
232 /*
233 * Filesystem type and version.
234 * Used to interpret other filesystem-specific
235 * per-partition information.
236 */
237 #define FS_UNUSED 0 /* unused */
238 #define FS_SWAP 1 /* swap */
239 #define FS_V6 2 /* Sixth Edition */
240 #define FS_V7 3 /* Seventh Edition */
241 #define FS_SYSV 4 /* System V */
242 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
243 #define FS_V8 6 /* Eighth Edition, 4K blocks */
244 #define FS_BSDFFS 7 /* 4.2BSD fast filesystem */
245 #define FS_MSDOS 8 /* MSDOS filesystem */
246 #define FS_BSDLFS 9 /* 4.4BSD log-structured filesystem */
247 #define FS_OTHER 10 /* in use, but unknown/unsupported */
248 #define FS_HPFS 11 /* OS/2 high-performance filesystem */
249 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
250 #define FS_BOOT 13 /* partition contains bootstrap */
251 #define FS_VINUM 14 /* Vinum drive */
252 #define FS_RAID 15 /* RAIDFrame drive */
253 #define FS_JFS2 21 /* IBM JFS2 */
254
255 #ifdef FSTYPENAMES
256 static const char *fstypenames[] = {
257 "unused",
258 "swap",
259 "Version 6",
260 "Version 7",
261 "System V",
262 "4.1BSD",
263 "Eighth Edition",
264 "4.2BSD",
265 "MSDOS",
266 "4.4LFS",
267 "unknown",
268 "HPFS",
269 "ISO9660",
270 "boot",
271 "vinum",
272 "raid",
273 "?",
274 "?",
275 "?",
276 "?",
277 "jfs",
278 NULL
279 };
280 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
281 #endif
282
283 /*
284 * flags shared by various drives:
285 */
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 */
291
292 /*
293 * Disklabel-specific ioctls.
294 *
295 * NB: <sys/disk.h> defines ioctls from 'd'/128 and up.
296 */
297 /* get and set disklabel */
298 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
299 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
300 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
301 #define DIOCBSDBB _IOW('d', 110, void *) /* write bootblocks */
302
303 /*
304 * Functions for proper encoding/decoding of struct disklabel into/from
305 * bytestring.
306 */
307 void bsd_partition_le_dec(u_char *ptr, struct partition *d);
308 int bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart);
309 void bsd_partition_le_enc(u_char *ptr, struct partition *d);
310 void bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d);
311
312 #ifndef _KERNEL
313 __BEGIN_DECLS
314 struct disklabel *getdiskbyname(const char *);
315 __END_DECLS
316 #endif
317
318 #endif /* !_SYS_DISKLABEL_H_ */
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