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1.1 root 1: /*
2: * Copyright (c) 1987, 1988 Regents of the University of California.
3: * 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 7.19 (Berkeley) 5/7/91
34: */
35:
36: /*
37: * Disk description table, see disktab(5)
38: */
39: #define _PATH_DISKTAB "/etc/disktab"
40: #define DISKTAB "/etc/disktab" /* deprecated */
41:
42: /*
43: * Each disk has a label which includes information about the hardware
44: * disk geometry, filesystem partitions, and drive specific information.
45: * The label is in block 0 or 1, possibly offset from the beginning
46: * to leave room for a bootstrap, etc.
47: */
48:
49: /* XXX these should be defined per controller (or drive) elsewhere, not here! */
50: #ifdef i386
51: #define LABELSECTOR 1 /* sector containing label */
52: #define LABELOFFSET 0 /* offset of label in sector */
53: #endif
54:
55: #ifndef LABELSECTOR
56: #define LABELSECTOR 0 /* sector containing label */
57: #endif
58:
59: #ifndef LABELOFFSET
60: #define LABELOFFSET 64 /* offset of label in sector */
61: #endif
62:
63: #define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */
64: #ifndef MAXPARTITIONS
65: #define MAXPARTITIONS 8
66: #endif
67:
68:
69: #ifndef LOCORE
70: struct disklabel {
71: u_long d_magic; /* the magic number */
72: short d_type; /* drive type */
73: short d_subtype; /* controller/d_type specific */
74: char d_typename[16]; /* type name, e.g. "eagle" */
75: /*
76: * d_packname contains the pack identifier and is returned when
77: * the disklabel is read off the disk or in-core copy.
78: * d_boot0 and d_boot1 are the (optional) names of the
79: * primary (block 0) and secondary (block 1-15) bootstraps
80: * as found in /usr/mdec. These are returned when using
81: * getdiskbyname(3) to retrieve the values from /etc/disktab.
82: */
83: #if defined(KERNEL) || defined(STANDALONE)
84: char d_packname[16]; /* pack identifier */
85: #else
86: union {
87: char un_d_packname[16]; /* pack identifier */
88: struct {
89: char *un_d_boot0; /* primary bootstrap name */
90: char *un_d_boot1; /* secondary bootstrap name */
91: } un_b;
92: } d_un;
93: #define d_packname d_un.un_d_packname
94: #define d_boot0 d_un.un_b.un_d_boot0
95: #define d_boot1 d_un.un_b.un_d_boot1
96: #endif /* ! KERNEL or STANDALONE */
97: /* disk geometry: */
98: u_long d_secsize; /* # of bytes per sector */
99: u_long d_nsectors; /* # of data sectors per track */
100: u_long d_ntracks; /* # of tracks per cylinder */
101: u_long d_ncylinders; /* # of data cylinders per unit */
102: u_long d_secpercyl; /* # of data sectors per cylinder */
103: u_long d_secperunit; /* # of data sectors per unit */
104: /*
105: * Spares (bad sector replacements) below
106: * are not counted in d_nsectors or d_secpercyl.
107: * Spare sectors are assumed to be physical sectors
108: * which occupy space at the end of each track and/or cylinder.
109: */
110: u_short d_sparespertrack; /* # of spare sectors per track */
111: u_short d_sparespercyl; /* # of spare sectors per cylinder */
112: /*
113: * Alternate cylinders include maintenance, replacement,
114: * configuration description areas, etc.
115: */
116: u_long d_acylinders; /* # of alt. cylinders per unit */
117:
118: /* hardware characteristics: */
119: /*
120: * d_interleave, d_trackskew and d_cylskew describe perturbations
121: * in the media format used to compensate for a slow controller.
122: * Interleave is physical sector interleave, set up by the formatter
123: * or controller when formatting. When interleaving is in use,
124: * logically adjacent sectors are not physically contiguous,
125: * but instead are separated by some number of sectors.
126: * It is specified as the ratio of physical sectors traversed
127: * per logical sector. Thus an interleave of 1:1 implies contiguous
128: * layout, while 2:1 implies that logical sector 0 is separated
129: * by one sector from logical sector 1.
130: * d_trackskew is the offset of sector 0 on track N
131: * relative to sector 0 on track N-1 on the same cylinder.
132: * Finally, d_cylskew is the offset of sector 0 on cylinder N
133: * relative to sector 0 on cylinder N-1.
134: */
135: u_short d_rpm; /* rotational speed */
136: u_short d_interleave; /* hardware sector interleave */
137: u_short d_trackskew; /* sector 0 skew, per track */
138: u_short d_cylskew; /* sector 0 skew, per cylinder */
139: u_long d_headswitch; /* head switch time, usec */
140: u_long d_trkseek; /* track-to-track seek, usec */
141: u_long d_flags; /* generic flags */
142: #define NDDATA 5
143: u_long d_drivedata[NDDATA]; /* drive-type specific information */
144: #define NSPARE 5
145: u_long d_spare[NSPARE]; /* reserved for future use */
146: u_long d_magic2; /* the magic number (again) */
147: u_short d_checksum; /* xor of data incl. partitions */
148:
149: /* filesystem and partition information: */
150: u_short d_npartitions; /* number of partitions in following */
151: u_long d_bbsize; /* size of boot area at sn0, bytes */
152: u_long d_sbsize; /* max size of fs superblock, bytes */
153: struct partition { /* the partition table */
154: u_long p_size; /* number of sectors in partition */
155: u_long p_offset; /* starting sector */
156: u_long p_fsize; /* filesystem basic fragment size */
157: u_char p_fstype; /* filesystem type, see below */
158: u_char p_frag; /* filesystem fragments per block */
159: u_short p_cpg; /* filesystem cylinders per group */
160: } d_partitions[MAXPARTITIONS]; /* actually may be more */
161: };
162: #else LOCORE
163: /*
164: * offsets for asm boot files.
165: */
166: .set d_secsize,40
167: .set d_nsectors,44
168: .set d_ntracks,48
169: .set d_ncylinders,52
170: .set d_secpercyl,56
171: .set d_secperunit,60
172: .set d_end_,276 /* size of disk label */
173: #endif LOCORE
174:
175: /* d_type values: */
176: #define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
177: #define DTYPE_MSCP 2 /* MSCP */
178: #define DTYPE_DEC 3 /* other DEC (rk, rl) */
179: #define DTYPE_SCSI 4 /* SCSI */
180: #define DTYPE_ESDI 5 /* ESDI interface */
181: #define DTYPE_ST506 6 /* ST506 etc. */
182: #define DTYPE_FLOPPY 10 /* floppy */
183:
184: #ifdef DKTYPENAMES
185: static char *dktypenames[] = {
186: "unknown",
187: "SMD",
188: "MSCP",
189: "old DEC",
190: "SCSI",
191: "ESDI",
192: "ST506",
193: "type 7",
194: "type 8",
195: "type 9",
196: "floppy",
197: 0
198: };
199: #define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
200: #endif
201:
202: /*
203: * Filesystem type and version.
204: * Used to interpret other filesystem-specific
205: * per-partition information.
206: */
207: #define FS_UNUSED 0 /* unused */
208: #define FS_SWAP 1 /* swap */
209: #define FS_V6 2 /* Sixth Edition */
210: #define FS_V7 3 /* Seventh Edition */
211: #define FS_SYSV 4 /* System V */
212: #define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
213: #define FS_V8 6 /* Eighth Edition, 4K blocks */
214: #define FS_BSDFFS 7 /* 4.2BSD fast file system */
215: #define FS_MSDOS 8 /* MSDOS file system */
216:
217: #ifdef DKTYPENAMES
218: static char *fstypenames[] = {
219: "unused",
220: "swap",
221: "Version 6",
222: "Version 7",
223: "System V",
224: "4.1BSD",
225: "Eighth Edition",
226: "4.2BSD",
227: "MSDOS",
228: 0
229: };
230: #define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
231: #endif
232:
233: /*
234: * flags shared by various drives:
235: */
236: #define D_REMOVABLE 0x01 /* removable media */
237: #define D_ECC 0x02 /* supports ECC */
238: #define D_BADSECT 0x04 /* supports bad sector forw. */
239: #define D_RAMDISK 0x08 /* disk emulator */
240: #define D_CHAIN 0x10 /* can do back-back transfers */
241:
242: /*
243: * Drive data for SMD.
244: */
245: #define d_smdflags d_drivedata[0]
246: #define D_SSE 0x1 /* supports skip sectoring */
247: #define d_mindist d_drivedata[1]
248: #define d_maxdist d_drivedata[2]
249: #define d_sdist d_drivedata[3]
250:
251: /*
252: * Drive data for ST506.
253: */
254: #define d_precompcyl d_drivedata[0]
255: #define d_gap3 d_drivedata[1] /* used only when formatting */
256:
257: /*
258: * Drive data for SCSI.
259: */
260: #define d_blind d_drivedata[0]
261:
262: #ifndef LOCORE
263: /*
264: * Structure used to perform a format
265: * or other raw operation, returning data
266: * and/or register values.
267: * Register identification and format
268: * are device- and driver-dependent.
269: */
270: struct format_op {
271: char *df_buf;
272: int df_count; /* value-result */
273: daddr_t df_startblk;
274: int df_reg[8]; /* result */
275: };
276:
277: /*
278: * Structure used internally to retrieve
279: * information about a partition on a disk.
280: */
281: struct partinfo {
282: struct disklabel *disklab;
283: struct partition *part;
284: };
285:
286: /*
287: * Disk-specific ioctls.
288: */
289: /* get and set disklabel; DIOCGPART used internally */
290: #define DIOCGDINFO _IOR('d', 101, struct disklabel)/* get */
291: #define DIOCSDINFO _IOW('d', 102, struct disklabel)/* set */
292: #define DIOCWDINFO _IOW('d', 103, struct disklabel)/* set, update disk */
293: #define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
294:
295: /* do format operation, read or write */
296: #define DIOCRFORMAT _IOWR('d', 105, struct format_op)
297: #define DIOCWFORMAT _IOWR('d', 106, struct format_op)
298:
299: #define DIOCSSTEP _IOW('d', 107, int) /* set step rate */
300: #define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */
301: #define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
302:
303: #define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */
304:
305: #endif LOCORE
306:
307: #if !defined(KERNEL) && !defined(LOCORE)
308:
309: #include <sys/cdefs.h>
310:
311: __BEGIN_DECLS
312: struct disklabel *getdiskbyname __P((const char *));
313: __END_DECLS
314:
315: #endif
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