Annotation of sys/dev/ccdvar.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ccdvar.h,v 1.11 2007/06/06 17:15:13 deraadt Exp $ */
2: /* $NetBSD: ccdvar.h,v 1.11 1996/02/28 01:08:32 thorpej Exp $ */
3:
4: /*-
5: * Copyright (c) 1996 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Jason R. Thorpe.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the NetBSD
22: * Foundation, Inc. and its contributors.
23: * 4. Neither the name of The NetBSD Foundation nor the names of its
24: * contributors may be used to endorse or promote products derived
25: * from this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
31: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: */
39:
40: /*
41: * Copyright (c) 1988 University of Utah.
42: * Copyright (c) 1990, 1993
43: * The Regents of the University of California. All rights reserved.
44: *
45: * This code is derived from software contributed to Berkeley by
46: * the Systems Programming Group of the University of Utah Computer
47: * Science Department.
48: *
49: * Redistribution and use in source and binary forms, with or without
50: * modification, are permitted provided that the following conditions
51: * are met:
52: * 1. Redistributions of source code must retain the above copyright
53: * notice, this list of conditions and the following disclaimer.
54: * 2. Redistributions in binary form must reproduce the above copyright
55: * notice, this list of conditions and the following disclaimer in the
56: * documentation and/or other materials provided with the distribution.
57: * 3. Neither the name of the University nor the names of its contributors
58: * may be used to endorse or promote products derived from this software
59: * without specific prior written permission.
60: *
61: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
62: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
63: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
64: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
65: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
66: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
67: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
68: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
69: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
70: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
71: * SUCH DAMAGE.
72: *
73: * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
74: *
75: * @(#)cdvar.h 8.1 (Berkeley) 6/10/93
76: */
77:
78: /*
79: * Dynamic configuration and disklabel support by:
80: * Jason R. Thorpe <thorpej@nas.nasa.gov>
81: * Numerical Aerodynamic Simulation Facility
82: * Mail Stop 258-6
83: * NASA Ames Research Center
84: * Moffett Field, CA 94035
85: */
86:
87: /*
88: * A concatenated disk is described at initialization time by this structure.
89: */
90: struct ccddevice {
91: struct vnode **ccd_vpp; /* array of component vnodes */
92: char **ccd_cpp; /* array of component pathnames */
93: int ccd_unit; /* logical unit of this ccd */
94: int ccd_interleave; /* interleave (DEV_BSIZE blocks) */
95: int ccd_flags; /* misc. information */
96: int ccd_ndev; /* number of component devices */
97: };
98:
99: /*
100: * This structure is used to configure a ccd via ioctl(2).
101: */
102: struct ccd_ioctl {
103: char **ccio_disks; /* pointer to component paths */
104: u_int ccio_ndisks; /* number of disks to concatenate */
105: int ccio_ileave; /* interleave (DEV_BSIZE blocks) */
106: int ccio_flags; /* misc. information */
107: int ccio_unit; /* unit number: use varies */
108: size_t ccio_size; /* (returned) size of ccd */
109: };
110:
111: /* ccd_flags */
112: #define CCDF_SWAP 0x01 /* interleave should be dmmax */
113: #define CCDF_UNIFORM 0x02 /* use LCCD of sizes for uniform interleave */
114: #define CCDF_MIRROR 0x04 /* enable data mirroring */
115: #define CCDF_OLD 0x08 /* legacy */
116: #define CCDF_BITS \
117: "\020\01swap\02uniform\03mirror\04old"
118:
119: /* Mask of user-settable ccd flags. */
120: #define CCDF_USERMASK \
121: (CCDF_SWAP|CCDF_UNIFORM|CCDF_MIRROR|CCDF_OLD)
122:
123: /*
124: * Component info table.
125: * Describes a single component of a concatenated disk.
126: */
127: struct ccdcinfo {
128: struct vnode *ci_vp; /* device's vnode */
129: char *ci_path; /* path to component */
130: size_t ci_size; /* size */
131: size_t ci_pathlen; /* length of component path */
132: dev_t ci_dev; /* XXX: device's dev_t */
133: int ci_flags; /* see below */
134: };
135:
136: #define CCIF_FAILED 0x01 /* had a B_ERROR on this one */
137:
138: /*
139: * Interleave description table.
140: * Computed at boot time to speed irregular-interleave lookups.
141: * The idea is that we interleave in "groups". First we interleave
142: * evenly over all component disks up to the size of the smallest
143: * component (the first group), then we interleave evenly over all
144: * remaining disks up to the size of the next-smallest (second group),
145: * and so on.
146: *
147: * Each table entry describes the interleave characteristics of one
148: * of these groups. For example if a concatenated disk consisted of
149: * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
150: * DEV_BSIZE (1), the table would have three entries:
151: *
152: * ndisk startblk startoff dev
153: * 3 0 0 0, 1, 2
154: * 2 9 3 0, 2
155: * 1 13 5 2
156: * 0 - - -
157: *
158: * which says that the first nine blocks (0-8) are interleaved over
159: * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
160: * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
161: * at component block 3, and the remaining blocks (13-14) are on disk
162: * 2 starting at offset 5.
163: */
164: struct ccdiinfo {
165: daddr64_t ii_startblk; /* starting scaled block # for range */
166: daddr64_t ii_startoff; /* starting component offset (block #) */
167: int *ii_index; /* ordered list of components in range */
168: int *ii_parity; /* list of parity shifts */
169: int ii_ndisk; /* # of disks range is interleaved over */
170: };
171:
172: /*
173: * Concatenated disk pseudo-geometry information.
174: */
175: struct ccdgeom {
176: u_int32_t ccg_secsize; /* # bytes per sector */
177: u_int32_t ccg_nsectors; /* # data sectors per track */
178: u_int32_t ccg_ntracks; /* # tracks per cylinder */
179: u_int32_t ccg_ncylinders; /* # cylinders per unit */
180: u_int16_t ccg_rpm;
181: };
182:
183: /*
184: * Before you can use a unit, it must be configured with CCDIOCSET.
185: * The configuration persists across opens and closes of the device;
186: * a CCDIOCCLR must be used to reset a configuration. An attempt to
187: * CCDIOCSET an already active unit will return EBUSY. Attempts to
188: * CCDIOCCLR an inactive unit will return ENXIO.
189: */
190: #define CCDIOCSET _IOWR('F', 16, struct ccd_ioctl) /* enable ccd */
191: #define CCDIOCCLR _IOW('F', 17, struct ccd_ioctl) /* disable ccd */
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