1 /* $FreeBSD: src/sys/sys/ccdvar.h,v 1.11.2.1 2001/09/11 09:49:54 kris Exp $ */ 2 /* $DragonFly: src/sys/sys/ccdvar.h,v 1.4 2006/05/20 02:42:13 dillon Exp $ */ 3 4 /* $NetBSD: ccdvar.h,v 1.7.2.1 1995/10/12 21:30:18 thorpej Exp $ */ 5 6 /* 7 * Copyright (c) 1995 Jason R. Thorpe. 8 * All rights reserved. 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 for the NetBSD Project 21 * by Jason R. Thorpe. 22 * 4. The name of the author may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 32 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1988 University of Utah. 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. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by the University of 58 * California, Berkeley and its contributors. 59 * 4. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 * 75 * from: Utah $Hdr: cdvar.h 1.1 90/07/09$ 76 * 77 * @(#)cdvar.h 8.1 (Berkeley) 6/10/93 78 */ 79 80 #ifndef _SYS_CCDVAR_H_ 81 #define _SYS_CCDVAR_H_ 82 83 /* 84 * Dynamic configuration and disklabel support by: 85 * Jason R. Thorpe <thorpej@nas.nasa.gov> 86 * Numerical Aerodynamic Simulation Facility 87 * Mail Stop 258-6 88 * NASA Ames Research Center 89 * Moffett Field, CA 94035 90 */ 91 92 #ifndef _SYS_TYPES_H_ 93 #include <sys/types.h> 94 #endif 95 #ifndef _SYS_DEVICESTAT_H_ 96 #include <sys/devicestat.h> 97 #endif 98 #ifndef _SYS_DISKLABEL_H_ 99 #include <sys/disklabel.h> 100 #endif 101 102 /* 103 * A concatenated disk is described at initialization time by this structure. 104 */ 105 struct ccddevice { 106 int ccd_unit; /* logical unit of this ccd */ 107 int ccd_interleave; /* interleave (DEV_BSIZE blocks) */ 108 int ccd_flags; /* misc. information */ 109 int ccd_dk; /* disk number */ 110 struct vnode **ccd_vpp; /* array of component vnodes */ 111 char **ccd_cpp; /* array of component pathnames */ 112 int ccd_ndev; /* number of component devices */ 113 }; 114 115 /* 116 * This structure is used to configure a ccd via ioctl(2). 117 */ 118 struct ccd_ioctl { 119 char **ccio_disks; /* pointer to component paths */ 120 u_int ccio_ndisks; /* number of disks to concatenate */ 121 int ccio_ileave; /* interleave (DEV_BSIZE blocks) */ 122 int ccio_flags; /* misc. information */ 123 int ccio_unit; /* unit number: use varies */ 124 size_t ccio_size; /* (returned) size of ccd */ 125 }; 126 127 /* ccd_flags */ 128 #define CCDF_SWAP 0x01 /* interleave should be dmmax */ 129 #define CCDF_UNIFORM 0x02 /* use LCCD of sizes for uniform interleave */ 130 #define CCDF_MIRROR 0x04 /* use mirroring */ 131 #define CCDF_PARITY 0x08 /* use parity (RAID level 5) */ 132 133 /* Mask of user-settable ccd flags. */ 134 #define CCDF_USERMASK (CCDF_SWAP|CCDF_UNIFORM|CCDF_MIRROR|CCDF_PARITY) 135 136 /* 137 * Component info table. 138 * Describes a single component of a concatenated disk. 139 */ 140 struct ccdcinfo { 141 struct vnode *ci_vp; /* device's vnode */ 142 dev_t ci_dev; /* XXX: device's dev_t */ 143 size_t ci_size; /* size */ 144 char *ci_path; /* path to component */ 145 size_t ci_pathlen; /* length of component path */ 146 }; 147 148 /* 149 * Interleave description table. 150 * Computed at boot time to speed irregular-interleave lookups. 151 * The idea is that we interleave in "groups". First we interleave 152 * evenly over all component disks up to the size of the smallest 153 * component (the first group), then we interleave evenly over all 154 * remaining disks up to the size of the next-smallest (second group), 155 * and so on. 156 * 157 * Each table entry describes the interleave characteristics of one 158 * of these groups. For example if a concatenated disk consisted of 159 * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at 160 * DEV_BSIZE (1), the table would have three entries: 161 * 162 * ndisk startblk startoff dev 163 * 3 0 0 0, 1, 2 164 * 2 9 3 0, 2 165 * 1 13 5 2 166 * 0 - - - 167 * 168 * which says that the first nine blocks (0-8) are interleaved over 169 * 3 disks (0, 1, 2) starting at block offset 0 on any component disk, 170 * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting 171 * at component block 3, and the remaining blocks (13-14) are on disk 172 * 2 starting at offset 5. 173 */ 174 struct ccdiinfo { 175 int ii_ndisk; /* # of disks range is interleaved over */ 176 daddr_t ii_startblk; /* starting scaled block # for range */ 177 daddr_t ii_startoff; /* starting component offset (block #) */ 178 int *ii_index; /* ordered list of components in range */ 179 }; 180 181 /* 182 * Concatenated disk pseudo-geometry information. 183 */ 184 struct ccdgeom { 185 u_int32_t ccg_secsize; /* # bytes per sector */ 186 u_int32_t ccg_nsectors; /* # data sectors per track */ 187 u_int32_t ccg_ntracks; /* # tracks per cylinder */ 188 u_int32_t ccg_ncylinders; /* # cylinders per unit */ 189 }; 190 191 /* 192 * A concatenated disk is described after initialization by this structure. 193 */ 194 struct ccd_softc { 195 int sc_unit; /* logical unit number */ 196 int sc_flags; /* flags */ 197 int sc_cflags; /* configuration flags */ 198 size_t sc_size; /* size of ccd */ 199 int sc_ileave; /* interleave */ 200 u_int sc_nccdisks; /* number of components */ 201 #define CCD_MAXNDISKS 65536 202 struct ccdcinfo *sc_cinfo; /* component info */ 203 struct ccdiinfo *sc_itable; /* interleave table */ 204 struct devstat device_stats; /* device statistics */ 205 struct ccdgeom sc_geom; /* pseudo geometry info */ 206 struct disklabel sc_label; /* generic disk device info */ 207 int sc_openmask; 208 int sc_pick; /* side of mirror picked */ 209 off_t sc_blk[2]; /* mirror localization */ 210 }; 211 212 /* sc_flags */ 213 #define CCDF_INITED 0x01 /* unit has been initialized */ 214 #define CCDF_WLABEL 0x02 /* label area is writable */ 215 #define CCDF_LABELLING 0x04 /* unit is currently being labelled */ 216 #define CCDF_WANTED 0x40 /* someone is waiting to obtain a lock */ 217 #define CCDF_LOCKED 0x80 /* unit is locked */ 218 219 /* 220 * Before you can use a unit, it must be configured with CCDIOCSET. 221 * The configuration persists across opens and closes of the device; 222 * a CCDIOCCLR must be used to reset a configuration. An attempt to 223 * CCDIOCSET an already active unit will return EBUSY. Attempts to 224 * CCDIOCCLR an inactive unit will return ENXIO. 225 */ 226 #define CCDIOCSET _IOWR('F', 16, struct ccd_ioctl) /* enable ccd */ 227 #define CCDIOCCLR _IOW('F', 17, struct ccd_ioctl) /* disable ccd */ 228 229 #endif 230