FreeBSD/Linux Kernel Cross Reference
sys/sys/ccdvar.h
1 /* $FreeBSD: releng/5.1/sys/sys/ccdvar.h 111979 2003-03-08 08:01:31Z phk $ */
2
3 /* $NetBSD: ccdvar.h,v 1.7.2.1 1995/10/12 21:30:18 thorpej Exp $ */
4
5 /*
6 * Copyright (c) 1995 Jason R. Thorpe.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project
20 * by Jason R. Thorpe.
21 * 4. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 /*
38 * Copyright (c) 1988 University of Utah.
39 * Copyright (c) 1990, 1993
40 * The Regents of the University of California. All rights reserved.
41 *
42 * This code is derived from software contributed to Berkeley by
43 * the Systems Programming Group of the University of Utah Computer
44 * Science Department.
45 *
46 * Redistribution and use in source and binary forms, with or without
47 * modification, are permitted provided that the following conditions
48 * are met:
49 * 1. Redistributions of source code must retain the above copyright
50 * notice, this list of conditions and the following disclaimer.
51 * 2. Redistributions in binary form must reproduce the above copyright
52 * notice, this list of conditions and the following disclaimer in the
53 * documentation and/or other materials provided with the distribution.
54 * 3. All advertising materials mentioning features or use of this software
55 * must display the following acknowledgement:
56 * This product includes software developed by the University of
57 * California, Berkeley and its contributors.
58 * 4. Neither the name of the University nor the names of its contributors
59 * may be used to endorse or promote products derived from this software
60 * without specific prior written permission.
61 *
62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
72 * SUCH DAMAGE.
73 *
74 * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
75 *
76 * @(#)cdvar.h 8.1 (Berkeley) 6/10/93
77 */
78
79 /*
80 * Dynamic configuration and disklabel support by:
81 * Jason R. Thorpe <thorpej@nas.nasa.gov>
82 * Numerical Aerodynamic Simulation Facility
83 * Mail Stop 258-6
84 * NASA Ames Research Center
85 * Moffett Field, CA 94035
86 */
87
88 /*
89 * This structure is used to configure a ccd via ioctl(2).
90 */
91 struct ccd_ioctl {
92 char **ccio_disks; /* pointer to component paths */
93 u_int ccio_ndisks; /* number of disks to concatenate */
94 int ccio_ileave; /* interleave (DEV_BSIZE blocks) */
95 int ccio_flags; /* misc. information */
96 int ccio_unit; /* unit number: use varies */
97 size_t ccio_size; /* (returned) size of ccd */
98 };
99
100 /*
101 * Component info table.
102 * Describes a single component of a concatenated disk.
103 */
104 struct ccdcinfo {
105 struct vnode *ci_vp; /* device's vnode */
106 dev_t ci_dev; /* XXX: device's dev_t */
107 size_t ci_size; /* size */
108 char *ci_path; /* path to component */
109 size_t ci_pathlen; /* length of component path */
110 };
111
112 /*
113 * Interleave description table.
114 * Computed at boot time to speed irregular-interleave lookups.
115 * The idea is that we interleave in "groups". First we interleave
116 * evenly over all component disks up to the size of the smallest
117 * component (the first group), then we interleave evenly over all
118 * remaining disks up to the size of the next-smallest (second group),
119 * and so on.
120 *
121 * Each table entry describes the interleave characteristics of one
122 * of these groups. For example if a concatenated disk consisted of
123 * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
124 * DEV_BSIZE (1), the table would have three entries:
125 *
126 * ndisk startblk startoff dev
127 * 3 0 0 0, 1, 2
128 * 2 9 3 0, 2
129 * 1 13 5 2
130 * 0 - - -
131 *
132 * which says that the first nine blocks (0-8) are interleaved over
133 * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
134 * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
135 * at component block 3, and the remaining blocks (13-14) are on disk
136 * 2 starting at offset 5.
137 */
138 struct ccdiinfo {
139 int ii_ndisk; /* # of disks range is interleaved over */
140 daddr_t ii_startblk; /* starting scaled block # for range */
141 daddr_t ii_startoff; /* starting component offset (block #) */
142 int *ii_index; /* ordered list of components in range */
143 };
144
145 /*
146 * Concatenated disk pseudo-geometry information.
147 */
148 struct ccdgeom {
149 u_int32_t ccg_secsize; /* # bytes per sector */
150 u_int32_t ccg_nsectors; /* # data sectors per track */
151 u_int32_t ccg_ntracks; /* # tracks per cylinder */
152 u_int32_t ccg_ncylinders; /* # cylinders per unit */
153 };
154
155 /*
156 * A concatenated disk is described by this structure.
157 */
158 struct ccd_s {
159 LIST_ENTRY(ccd_s) list;
160
161 int sc_unit; /* logical unit number */
162 struct vnode **sc_vpp; /* array of component vnodes */
163 int sc_flags; /* flags */
164 int sc_cflags; /* configuration flags */
165 size_t sc_size; /* size of ccd */
166 int sc_ileave; /* interleave */
167 u_int sc_nccdisks; /* number of components */
168 #define CCD_MAXNDISKS 65536
169 struct ccdcinfo *sc_cinfo; /* component info */
170 struct ccdiinfo *sc_itable; /* interleave table */
171 struct ccdgeom sc_geom; /* pseudo geometry info */
172 int sc_pick; /* side of mirror picked */
173 daddr_t sc_blk[2]; /* mirror localization */
174 struct disk *sc_disk;
175 struct cdev *__remove00; /* XXX: remove when convenient */
176 };
177
178 /* sc_flags */
179 #define CCDF_UNIFORM 0x02 /* use LCCD of sizes for uniform interleave */
180 #define CCDF_MIRROR 0x04 /* use mirroring */
181 #define CCDF_INITED 0x10 /* unit has been initialized */
182 #define CCDF_WLABEL 0x20 /* label area is writable */
183 #define CCDF_LABELLING 0x40 /* unit is currently being labelled */
184 #define CCDF_WANTED 0x60 /* someone is waiting to obtain a lock */
185 #define CCDF_LOCKED 0x80 /* unit is locked */
186
187 /* Mask of user-settable ccd flags. */
188 #define CCDF_USERMASK (CCDF_UNIFORM|CCDF_MIRROR)
189
190 /*
191 * Before you can use a unit, it must be configured with CCDIOCSET.
192 * The configuration persists across opens and closes of the device;
193 * a CCDIOCCLR must be used to reset a configuration. An attempt to
194 * CCDIOCSET an already active unit will return EBUSY. Attempts to
195 * CCDIOCCLR an inactive unit will return ENXIO.
196 */
197 #define CCDIOCSET _IOWR('F', 16, struct ccd_ioctl) /* enable ccd */
198 #define CCDIOCCLR _IOW('F', 17, struct ccd_ioctl) /* disable ccd */
199
200 struct ccdconf {
201 int size; /* sizeof of buffer below */
202 struct ccd_s *buffer; /* pointer to a configuration array */
203 };
204 #define CCDCONFINFO _IOWR('F', 19, struct ccdconf) /* get config */
205
206 struct ccdcpps {
207 int size;
208 char *buffer;
209 };
210 #define CCDCPPINFO _IOWR('F', 20, struct ccdcpps) /* get components */
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