FreeBSD/Linux Kernel Cross Reference
sys/dev/ccdvar.h
1 /* $NetBSD: ccdvar.h,v 1.24 2003/10/17 05:16:15 lukem Exp $ */
2
3 /*-
4 * Copyright (c) 1996, 1997, 1998, 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 /*
40 * Copyright (c) 1990, 1993
41 * The Regents of the University of California. All rights reserved.
42 *
43 * This code is derived from software contributed to Berkeley by
44 * the Systems Programming Group of the University of Utah Computer
45 * Science Department.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 * notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 * notice, this list of conditions and the following disclaimer in the
54 * documentation and/or other materials provided with the distribution.
55 * 3. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
72 *
73 * @(#)cdvar.h 8.1 (Berkeley) 6/10/93
74 */
75
76 /*
77 * Copyright (c) 1988 University of Utah.
78 *
79 * This code is derived from software contributed to Berkeley by
80 * the Systems Programming Group of the University of Utah Computer
81 * Science Department.
82 *
83 * Redistribution and use in source and binary forms, with or without
84 * modification, are permitted provided that the following conditions
85 * are met:
86 * 1. Redistributions of source code must retain the above copyright
87 * notice, this list of conditions and the following disclaimer.
88 * 2. Redistributions in binary form must reproduce the above copyright
89 * notice, this list of conditions and the following disclaimer in the
90 * documentation and/or other materials provided with the distribution.
91 * 3. All advertising materials mentioning features or use of this software
92 * must display the following acknowledgement:
93 * This product includes software developed by the University of
94 * California, Berkeley and its contributors.
95 * 4. Neither the name of the University nor the names of its contributors
96 * may be used to endorse or promote products derived from this software
97 * without specific prior written permission.
98 *
99 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
100 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
101 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
102 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
103 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
104 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
105 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
106 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
107 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
108 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
109 * SUCH DAMAGE.
110 *
111 * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
112 *
113 * @(#)cdvar.h 8.1 (Berkeley) 6/10/93
114 */
115
116 #include <sys/buf.h>
117 #include <sys/lock.h>
118 #include <sys/queue.h>
119
120 /*
121 * Dynamic configuration and disklabel support by:
122 * Jason R. Thorpe <thorpej@nas.nasa.gov>
123 * Numerical Aerodynamic Simulation Facility
124 * Mail Stop 258-6
125 * NASA Ames Research Center
126 * Moffett Field, CA 94035
127 */
128
129 /*
130 * This structure is used to configure a ccd via ioctl(2).
131 */
132 struct ccd_ioctl {
133 char **ccio_disks; /* pointer to component paths */
134 u_int ccio_ndisks; /* number of disks to concatenate */
135 int ccio_ileave; /* interleave (DEV_BSIZE blocks) */
136 int ccio_flags; /* see sc_flags below */
137 int ccio_unit; /* unit number: use varies */
138 size_t ccio_size; /* (returned) size of ccd */
139 };
140
141 /*
142 * Component info table.
143 * Describes a single component of a concatenated disk.
144 */
145 struct ccdcinfo {
146 struct vnode *ci_vp; /* device's vnode */
147 dev_t ci_dev; /* XXX: device's dev_t */
148 size_t ci_size; /* size */
149 char *ci_path; /* path to component */
150 size_t ci_pathlen; /* length of component path */
151 };
152
153 /*
154 * Interleave description table.
155 * Computed at boot time to speed irregular-interleave lookups.
156 * The idea is that we interleave in "groups". First we interleave
157 * evenly over all component disks up to the size of the smallest
158 * component (the first group), then we interleave evenly over all
159 * remaining disks up to the size of the next-smallest (second group),
160 * and so on.
161 *
162 * Each table entry describes the interleave characteristics of one
163 * of these groups. For example if a concatenated disk consisted of
164 * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
165 * DEV_BSIZE (1), the table would have three entries:
166 *
167 * ndisk startblk startoff dev
168 * 3 0 0 0, 1, 2
169 * 2 9 3 0, 2
170 * 1 13 5 2
171 * 0 - - -
172 *
173 * which says that the first nine blocks (0-8) are interleaved over
174 * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
175 * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
176 * at component block 3, and the remaining blocks (13-14) are on disk
177 * 2 starting at offset 5.
178 */
179 struct ccdiinfo {
180 int ii_ndisk; /* # of disks range is interleaved over */
181 daddr_t ii_startblk; /* starting scaled block # for range */
182 daddr_t ii_startoff; /* starting component offset (block #) */
183 int *ii_index; /* ordered list of components in range */
184 };
185
186 /*
187 * Concatenated disk pseudo-geometry information.
188 */
189 struct ccdgeom {
190 u_int32_t ccg_secsize; /* # bytes per sector */
191 u_int32_t ccg_nsectors; /* # data sectors per track */
192 u_int32_t ccg_ntracks; /* # tracks per cylinder */
193 u_int32_t ccg_ncylinders; /* # cylinders per unit */
194 };
195
196 struct ccdbuf;
197
198 /*
199 * A concatenated disk is described after initialization by this structure.
200 */
201 struct ccd_softc {
202 int sc_flags; /* flags */
203 size_t sc_size; /* size of ccd */
204 int sc_ileave; /* interleave */
205 u_int sc_nccdisks; /* number of components */
206 #define CCD_MAXNDISKS 65536
207 struct ccdcinfo *sc_cinfo; /* component info */
208 struct ccdiinfo *sc_itable; /* interleave table */
209 struct ccdgeom sc_geom; /* pseudo geometry info */
210 char sc_xname[8]; /* XXX external name */
211 struct disk sc_dkdev; /* generic disk device info */
212 struct lock sc_lock; /* lock on this structure */
213 struct bufq_state sc_bufq; /* buffer queue */
214 };
215
216 /* sc_flags */
217 #define CCDF_UNIFORM 0x002 /* use LCCD of sizes for uniform interleave */
218 #define CCDF_NOLABEL 0x004 /* ignore on-disk (raw) disklabel */
219
220 #define CCDF_INITED 0x010 /* unit has been initialized */
221 #define CCDF_WLABEL 0x020 /* label area is writable */
222 #define CCDF_LABELLING 0x040 /* unit is currently being labelled */
223 #define CCDF_KLABEL 0x080 /* keep label on close */
224 #define CCDF_VLABEL 0x100 /* label is valid */
225
226 /* Mask of user-settable ccd flags. */
227 #define CCDF_USERMASK (CCDF_UNIFORM|CCDF_NOLABEL)
228
229 /*
230 * Before you can use a unit, it must be configured with CCDIOCSET.
231 * The configuration persists across opens and closes of the device;
232 * a CCDIOCCLR must be used to reset a configuration. An attempt to
233 * CCDIOCSET an already active unit will return EBUSY. Attempts to
234 * CCDIOCCLR an inactive unit will return ENXIO.
235 */
236 #define CCDIOCSET _IOWR('F', 16, struct ccd_ioctl) /* enable ccd */
237 #define CCDIOCCLR _IOW('F', 17, struct ccd_ioctl) /* disable ccd */
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