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/5.2/sys/sys/disklabel.h 115947 2003-06-07 09:06:39Z 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 #if defined(__i386__) || defined(__amd64__) || defined(__ia64__)
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 #define DISKMAGIC ((u_int32_t)0x82564557) /* The disk magic number */
69 #ifndef MAXPARTITIONS
70 #define MAXPARTITIONS 8
71 #endif
72
73 /* Size of bootblock area in sector-size neutral bytes */
74 #define BBSIZE 8192
75
76 #define LABEL_PART 2 /* partition containing label */
77 #define RAW_PART 2 /* partition containing whole disk */
78 #define SWAP_PART 1 /* partition normally containing swap */
79
80 struct disklabel {
81 u_int32_t d_magic; /* the magic number */
82 u_int16_t d_type; /* drive type */
83 u_int16_t d_subtype; /* controller/d_type specific */
84 char d_typename[16]; /* type name, e.g. "eagle" */
85
86 char d_packname[16]; /* pack identifier */
87
88 /* disk geometry: */
89 u_int32_t d_secsize; /* # of bytes per sector */
90 u_int32_t d_nsectors; /* # of data sectors per track */
91 u_int32_t d_ntracks; /* # of tracks per cylinder */
92 u_int32_t d_ncylinders; /* # of data cylinders per unit */
93 u_int32_t d_secpercyl; /* # of data sectors per cylinder */
94 u_int32_t d_secperunit; /* # of data sectors per unit */
95
96 /*
97 * Spares (bad sector replacements) below are not counted in
98 * d_nsectors or d_secpercyl. Spare sectors are assumed to
99 * be physical sectors which occupy space at the end of each
100 * track and/or cylinder.
101 */
102 u_int16_t d_sparespertrack; /* # of spare sectors per track */
103 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */
104 /*
105 * Alternate cylinders include maintenance, replacement, configuration
106 * description areas, etc.
107 */
108 u_int32_t d_acylinders; /* # of alt. cylinders per unit */
109
110 /* hardware characteristics: */
111 /*
112 * d_interleave, d_trackskew and d_cylskew describe perturbations
113 * in the media format used to compensate for a slow controller.
114 * Interleave is physical sector interleave, set up by the
115 * formatter or controller when formatting. When interleaving is
116 * in use, logically adjacent sectors are not physically
117 * contiguous, but instead are separated by some number of
118 * sectors. It is specified as the ratio of physical sectors
119 * traversed per logical sector. Thus an interleave of 1:1
120 * implies contiguous layout, while 2:1 implies that logical
121 * sector 0 is separated by one sector from logical sector 1.
122 * d_trackskew is the offset of sector 0 on track N relative to
123 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew
124 * is the offset of sector 0 on cylinder N relative to sector 0
125 * on cylinder N-1.
126 */
127 u_int16_t d_rpm; /* rotational speed */
128 u_int16_t d_interleave; /* hardware sector interleave */
129 u_int16_t d_trackskew; /* sector 0 skew, per track */
130 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */
131 u_int32_t d_headswitch; /* head switch time, usec */
132 u_int32_t d_trkseek; /* track-to-track seek, usec */
133 u_int32_t d_flags; /* generic flags */
134 #define NDDATA 5
135 u_int32_t d_drivedata[NDDATA]; /* drive-type specific information */
136 #define NSPARE 5
137 u_int32_t d_spare[NSPARE]; /* reserved for future use */
138 u_int32_t d_magic2; /* the magic number (again) */
139 u_int16_t d_checksum; /* xor of data incl. partitions */
140
141 /* filesystem and partition information: */
142 u_int16_t d_npartitions; /* number of partitions in following */
143 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */
144 u_int32_t d_sbsize; /* max size of fs superblock, bytes */
145 struct partition { /* the partition table */
146 u_int32_t p_size; /* number of sectors in partition */
147 u_int32_t p_offset; /* starting sector */
148 u_int32_t p_fsize; /* filesystem basic fragment size */
149 u_int8_t p_fstype; /* filesystem type, see below */
150 u_int8_t p_frag; /* filesystem fragments per block */
151 u_int16_t p_cpg; /* filesystem cylinders per group */
152 } d_partitions[MAXPARTITIONS]; /* actually may be more */
153 };
154
155 #ifdef CTASSERT
156 CTASSERT(sizeof(struct disklabel) == 148 + MAXPARTITIONS * 16);
157 #endif
158
159 static __inline u_int16_t dkcksum(struct disklabel *lp);
160 static __inline u_int16_t
161 dkcksum(struct disklabel *lp)
162 {
163 u_int16_t *start, *end;
164 u_int16_t sum = 0;
165
166 start = (u_int16_t *)lp;
167 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
168 while (start < end)
169 sum ^= *start++;
170 return (sum);
171 }
172
173
174 /* d_type values: */
175 #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
176 #define DTYPE_MSCP 2 /* MSCP */
177 #define DTYPE_DEC 3 /* other DEC (rk, rl) */
178 #define DTYPE_SCSI 4 /* SCSI */
179 #define DTYPE_ESDI 5 /* ESDI interface */
180 #define DTYPE_ST506 6 /* ST506 etc. */
181 #define DTYPE_HPIB 7 /* CS/80 on HP-IB */
182 #define DTYPE_HPFL 8 /* HP Fiber-link */
183 #define DTYPE_FLOPPY 10 /* floppy */
184 #define DTYPE_CCD 11 /* concatenated disk */
185 #define DTYPE_VINUM 12 /* vinum volume */
186 #define DTYPE_DOC2K 13 /* Msys DiskOnChip */
187 #define DTYPE_RAID 14 /* CMU RAIDFrame */
188 #define DTYPE_JFS2 16 /* IBM JFS 2 */
189
190 #ifdef DKTYPENAMES
191 static const char *dktypenames[] = {
192 "unknown",
193 "SMD",
194 "MSCP",
195 "old DEC",
196 "SCSI",
197 "ESDI",
198 "ST506",
199 "HP-IB",
200 "HP-FL",
201 "type 9",
202 "floppy",
203 "CCD",
204 "Vinum",
205 "DOC2K",
206 "Raid",
207 "?",
208 "jfs",
209 NULL
210 };
211 #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
212 #endif
213
214 /*
215 * Filesystem type and version.
216 * Used to interpret other filesystem-specific
217 * per-partition information.
218 */
219 #define FS_UNUSED 0 /* unused */
220 #define FS_SWAP 1 /* swap */
221 #define FS_V6 2 /* Sixth Edition */
222 #define FS_V7 3 /* Seventh Edition */
223 #define FS_SYSV 4 /* System V */
224 #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
225 #define FS_V8 6 /* Eighth Edition, 4K blocks */
226 #define FS_BSDFFS 7 /* 4.2BSD fast filesystem */
227 #define FS_MSDOS 8 /* MSDOS filesystem */
228 #define FS_BSDLFS 9 /* 4.4BSD log-structured filesystem */
229 #define FS_OTHER 10 /* in use, but unknown/unsupported */
230 #define FS_HPFS 11 /* OS/2 high-performance filesystem */
231 #define FS_ISO9660 12 /* ISO 9660, normally CD-ROM */
232 #define FS_BOOT 13 /* partition contains bootstrap */
233 #define FS_VINUM 14 /* Vinum drive */
234 #define FS_RAID 15 /* RAIDFrame drive */
235 #define FS_JFS2 21 /* IBM JFS2 */
236
237 #ifdef FSTYPENAMES
238 static const char *fstypenames[] = {
239 "unused",
240 "swap",
241 "Version 6",
242 "Version 7",
243 "System V",
244 "4.1BSD",
245 "Eighth Edition",
246 "4.2BSD",
247 "MSDOS",
248 "4.4LFS",
249 "unknown",
250 "HPFS",
251 "ISO9660",
252 "boot",
253 "vinum",
254 "raid",
255 "?",
256 "?",
257 "?",
258 "?",
259 "jfs",
260 NULL
261 };
262 #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
263 #endif
264
265 /*
266 * flags shared by various drives:
267 */
268 #define D_REMOVABLE 0x01 /* removable media */
269 #define D_ECC 0x02 /* supports ECC */
270 #define D_BADSECT 0x04 /* supports bad sector forw. */
271 #define D_RAMDISK 0x08 /* disk emulator */
272 #define D_CHAIN 0x10 /* can do back-back transfers */
273
274 /*
275 * Disklabel-specific ioctls.
276 *
277 * NB: <sys/disk.h> defines ioctls from 'd'/128 and up.
278 */
279 /* get and set disklabel */
280 #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
281 #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
282 #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
283 #define DIOCBSDBB _IOW('d', 110, void *) /* write bootblocks */
284
285 /*
286 * Functions for proper encoding/decoding of struct disklabel into/from
287 * bytestring.
288 */
289 void bsd_partition_le_dec(u_char *ptr, struct partition *d);
290 int bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart);
291 void bsd_partition_le_enc(u_char *ptr, struct partition *d);
292 void bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d);
293
294 #ifndef _KERNEL
295 __BEGIN_DECLS
296 struct disklabel *getdiskbyname(const char *);
297 __END_DECLS
298 #endif
299
300 #endif /* !_SYS_DISKLABEL_H_ */
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