ccdvar.h revision 1.8
1 /* $NetBSD: ccdvar.h,v 1.8 1995/10/12 21:28:35 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Jason R. Thorpe. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project 18 * by Jason R. Thorpe. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Copyright (c) 1988 University of Utah. 37 * Copyright (c) 1990, 1993 38 * The Regents of the University of California. All rights reserved. 39 * 40 * This code is derived from software contributed to Berkeley by 41 * the Systems Programming Group of the University of Utah Computer 42 * Science Department. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 * from: Utah $Hdr: cdvar.h 1.1 90/07/09$ 73 * 74 * @(#)cdvar.h 8.1 (Berkeley) 6/10/93 75 */ 76 77 /* 78 * Dynamic configuration and disklabel support by: 79 * Jason R. Thorpe <thorpej (at) nas.nasa.gov> 80 * Numerical Aerodynamic Simulation Facility 81 * Mail Stop 258-6 82 * NASA Ames Research Center 83 * Moffett Field, CA 94035 84 */ 85 86 /* 87 * A concatenated disk is described at initialization time by this structure. 88 */ 89 struct ccddevice { 90 int ccd_unit; /* logical unit of this ccd */ 91 int ccd_interleave; /* interleave (DEV_BSIZE blocks) */ 92 int ccd_flags; /* misc. information */ 93 int ccd_dk; /* disk number */ 94 struct vnode **ccd_vpp; /* array of component vnodes */ 95 char **ccd_cpp; /* array of component pathnames */ 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 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 */ 114 115 /* Mask of user-settable ccd flags. */ 116 #define CCDF_USERMASK (CCDF_SWAP|CCDF_UNIFORM) 117 118 /* 119 * Component info table. 120 * Describes a single component of a concatenated disk. 121 */ 122 struct ccdcinfo { 123 struct vnode *ci_vp; /* device's vnode */ 124 dev_t ci_dev; /* XXX: device's dev_t */ 125 size_t ci_size; /* size */ 126 char *ci_path; /* path to component */ 127 size_t ci_pathlen; /* length of component path */ 128 }; 129 130 /* 131 * Interleave description table. 132 * Computed at boot time to speed irregular-interleave lookups. 133 * The idea is that we interleave in "groups". First we interleave 134 * evenly over all component disks up to the size of the smallest 135 * component (the first group), then we interleave evenly over all 136 * remaining disks up to the size of the next-smallest (second group), 137 * and so on. 138 * 139 * Each table entry describes the interleave characteristics of one 140 * of these groups. For example if a concatenated disk consisted of 141 * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at 142 * DEV_BSIZE (1), the table would have three entries: 143 * 144 * ndisk startblk startoff dev 145 * 3 0 0 0, 1, 2 146 * 2 9 3 0, 2 147 * 1 13 5 2 148 * 0 - - - 149 * 150 * which says that the first nine blocks (0-8) are interleaved over 151 * 3 disks (0, 1, 2) starting at block offset 0 on any component disk, 152 * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting 153 * at component block 3, and the remaining blocks (13-14) are on disk 154 * 2 starting at offset 5. 155 */ 156 struct ccdiinfo { 157 int ii_ndisk; /* # of disks range is interleaved over */ 158 daddr_t ii_startblk; /* starting scaled block # for range */ 159 daddr_t ii_startoff; /* starting component offset (block #) */ 160 int *ii_index; /* ordered list of components in range */ 161 }; 162 163 /* 164 * Concatenated disk pseudo-geometry information. 165 */ 166 struct ccdgeom { 167 u_int32_t ccg_secsize; /* # bytes per sector */ 168 u_int32_t ccg_nsectors; /* # data sectors per track */ 169 u_int32_t ccg_ntracks; /* # tracks per cylinder */ 170 u_int32_t ccg_ncylinders; /* # cylinders per unit */ 171 }; 172 173 /* 174 * A concatenated disk is described after initialization by this structure. 175 */ 176 struct ccd_softc { 177 int sc_unit; /* logical unit number */ 178 int sc_flags; /* flags */ 179 int sc_cflags; /* configuration flags */ 180 size_t sc_size; /* size of ccd */ 181 int sc_ileave; /* interleave */ 182 int sc_nccdisks; /* number of components */ 183 struct ccdcinfo *sc_cinfo; /* component info */ 184 struct ccdiinfo *sc_itable; /* interleave table */ 185 int sc_nactive; /* number of requests active */ 186 int sc_dk; /* disk index */ 187 struct ccdgeom sc_geom; /* pseudo geometry info */ 188 struct dkdevice sc_dkdev; /* generic disk device info */ 189 }; 190 191 /* sc_flags */ 192 #define CCDF_INITED 0x01 /* unit has been initialized */ 193 #define CCDF_WLABEL 0x02 /* label area is writable */ 194 #define CCDF_LABELLING 0x04 /* unit is currently being labelled */ 195 #define CCDF_WANTED 0x40 /* someone is waiting to obtain a lock */ 196 #define CCDF_LOCKED 0x80 /* unit is locked */ 197 198 /* 199 * Before you can use a unit, it must be configured with CCDIOCSET. 200 * The configuration persists across opens and closes of the device; 201 * a CCDIOCCLR must be used to reset a configuration. An attempt to 202 * CCDIOCSET an already active unit will return EBUSY. Attempts to 203 * CCDIOCCLR an inactive unit will return ENXIO. 204 */ 205 #define CCDIOCSET _IOWR('F', 16, struct ccd_ioctl) /* enable ccd */ 206 #define CCDIOCCLR _IOW('F', 17, struct ccd_ioctl) /* disable ccd */ 207
Indexes created Wed Sep 24 15:09:51 GMT 2025