Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/vinum/vinumobj.h
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1 /*- 2 * Copyright (c) 1997, 1998, 1999 3 * Nan Yang Computer Services Limited. All rights reserved. 4 * 5 * Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project. 6 * 7 * Written by Greg Lehey 8 * 9 * This software is distributed under the so-called ``Berkeley 10 * License'': 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by Nan Yang Computer 23 * Services Limited. 24 * 4. Neither the name of the Company nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * This software is provided ``as is'', and any express or implied 29 * warranties, including, but not limited to, the implied warranties of 30 * merchantability and fitness for a particular purpose are disclaimed. 31 * In no event shall the company or contributors be liable for any 32 * direct, indirect, incidental, special, exemplary, or consequential 33 * damages (including, but not limited to, procurement of substitute 34 * goods or services; loss of use, data, or profits; or business 35 * interruption) however caused and on any theory of liability, whether 36 * in contract, strict liability, or tort (including negligence or 37 * otherwise) arising in any way out of the use of this software, even if 38 * advised of the possibility of such damage. 39 * 40 * $Id: vinumobj.h,v 1.2 2001/05/23 23:04:18 grog Exp grog $ 41 * $FreeBSD: releng/5.0/sys/dev/vinum/vinumobj.h 96755 2002-05-16 21:28:32Z trhodes $ 42 */ 43 44 /* 45 * Definitions of Vinum objects: drive, subdisk, plex and volume. 46 * This file is included both by userland programs and by kernel code. 47 * The userland structures are a subset of the kernel structures, and 48 * all userland fields are at the beginning, so that a simple copy in 49 * the length of the userland structure will be sufficient. In order 50 * to perform this copy, vinumioctl must know both structures, so it 51 * includes this file again with _KERNEL reset. 52 */ 53 54 #ifndef _KERNEL 55 /* 56 * Flags for all objects. Most of them only apply 57 * to specific objects, but we currently have 58 * space for all in any 32 bit flags word. 59 */ 60 enum objflags { 61 VF_LOCKED = 1, /* somebody has locked access to this object */ 62 VF_LOCKING = 2, /* we want access to this object */ 63 VF_OPEN = 4, /* object has openers */ 64 VF_WRITETHROUGH = 8, /* volume: write through */ 65 VF_INITED = 0x10, /* unit has been initialized */ 66 VF_WLABEL = 0x20, /* label area is writable */ 67 VF_LABELLING = 0x40, /* unit is currently being labelled */ 68 VF_WANTED = 0x80, /* someone is waiting to obtain a lock */ 69 VF_RAW = 0x100, /* raw volume (no filesystem) */ 70 VF_LOADED = 0x200, /* module is loaded */ 71 VF_CONFIGURING = 0x400, /* somebody is changing the config */ 72 VF_WILL_CONFIGURE = 0x800, /* somebody wants to change the config */ 73 VF_CONFIG_INCOMPLETE = 0x1000, /* haven't finished changing the config */ 74 VF_CONFIG_SETUPSTATE = 0x2000, /* set a volume up if all plexes are empty */ 75 VF_READING_CONFIG = 0x4000, /* we're reading config database from disk */ 76 VF_FORCECONFIG = 0x8000, /* configure drives even with different names */ 77 VF_NEWBORN = 0x10000, /* for objects: we've just created it */ 78 VF_CONFIGURED = 0x20000, /* for drives: we read the config */ 79 VF_STOPPING = 0x40000, /* for vinum_conf: stop on last close */ 80 VF_DAEMONOPEN = 0x80000, /* the daemon has us open (only superdev) */ 81 VF_CREATED = 0x100000, /* for volumes: freshly created, more then new */ 82 VF_HOTSPARE = 0x200000, /* for drives: use as hot spare */ 83 VF_RETRYERRORS = 0x400000, /* don't down subdisks on I/O errors */ 84 VF_HASDEBUG = 0x800000, /* set if we support debug */ 85 }; 86 87 #endif 88 89 /* Global configuration information for the vinum subsystem */ 90 #ifdef _KERNEL 91 struct _vinum_conf 92 #else 93 struct __vinum_conf 94 #endif 95 { 96 int version; /* version of structures */ 97 #ifdef _KERNEL 98 /* Pointers to vinum structures */ 99 struct drive *drive; 100 struct sd *sd; 101 struct plex *plex; 102 struct volume *volume; 103 #else 104 /* Pointers to vinum structures */ 105 struct _drive *drive; 106 struct _sd *sd; 107 struct _plex *plex; 108 struct _volume *volume; 109 #endif 110 111 /* the number allocated */ 112 int drives_allocated; 113 int subdisks_allocated; 114 int plexes_allocated; 115 int volumes_allocated; 116 117 /* and the number currently in use */ 118 int drives_used; 119 int subdisks_used; 120 int plexes_used; 121 int volumes_used; 122 123 int flags; /* see above */ 124 125 #define VINUM_MAXACTIVE 30000 /* maximum number of active requests */ 126 int active; /* current number of requests outstanding */ 127 int maxactive; /* maximum number of requests ever outstanding */ 128 #ifdef _KERNEL 129 #ifdef VINUMDEBUG 130 struct request *lastrq; 131 struct buf *lastbuf; 132 #endif 133 #endif 134 }; 135 136 /* Use these defines to simplify code */ 137 #define DRIVE vinum_conf.drive 138 #define SD vinum_conf.sd 139 #define PLEX vinum_conf.plex 140 #define VOL vinum_conf.volume 141 #define VFLAGS vinum_conf.flags 142 143 /* 144 * A drive corresponds to a disk slice. We use a different term to show 145 * the difference in usage: it doesn't have to be a slice, and could 146 * theoretically be a complete, unpartitioned disk 147 */ 148 149 #ifdef _KERNEL 150 struct drive 151 #else 152 struct _drive 153 #endif 154 { 155 char devicename[MAXDRIVENAME]; /* name of the slice it's on */ 156 struct vinum_label label; /* and the label information */ 157 enum drivestate state; /* current state */ 158 int flags; /* flags */ 159 int subdisks_allocated; /* number of entries in sd */ 160 int subdisks_used; /* and the number used */ 161 int blocksize; /* size of fs blocks */ 162 int pid; /* of locker */ 163 u_int64_t sectors_available; /* number of sectors still available */ 164 int secsperblock; 165 int lasterror; /* last error on drive */ 166 int driveno; /* index of drive in vinum_conf */ 167 int opencount; /* number of up subdisks */ 168 u_int64_t reads; /* number of reads on this drive */ 169 u_int64_t writes; /* number of writes on this drive */ 170 u_int64_t bytes_read; /* number of bytes read */ 171 u_int64_t bytes_written; /* number of bytes written */ 172 #define DRIVE_MAXACTIVE 30000 /* maximum number of active requests */ 173 int active; /* current number of requests outstanding */ 174 int maxactive; /* maximum number of requests ever outstanding */ 175 int freelist_size; /* number of entries alloced in free list */ 176 int freelist_entries; /* number of entries used in free list */ 177 struct drive_freelist *freelist; /* sorted list of free space on drive */ 178 #ifdef _KERNEL 179 u_int sectorsize; 180 off_t mediasize; 181 dev_t dev; /* device information */ 182 #ifdef VINUMDEBUG 183 char lockfilename[16]; /* name of file from which we were locked */ 184 int lockline; /* and the line number */ 185 #endif 186 #endif 187 }; 188 189 #ifdef _KERNEL 190 struct sd 191 #else 192 struct _sd 193 #endif 194 { 195 char name[MAXSDNAME]; /* name of subdisk */ 196 enum sdstate state; /* state */ 197 int flags; 198 int lasterror; /* last error occurred */ 199 /* offsets in blocks */ 200 int64_t driveoffset; /* offset on drive */ 201 /* 202 * plexoffset is the offset from the beginning 203 * of the plex to the very first part of the 204 * subdisk, in sectors. For striped, RAID-4 and 205 * RAID-5 plexes, only the first stripe is 206 * located at this offset 207 */ 208 int64_t plexoffset; /* offset in plex */ 209 u_int64_t sectors; /* and length in sectors */ 210 int plexno; /* index of plex, if it belongs */ 211 int driveno; /* index of the drive on which it is located */ 212 int sdno; /* our index in vinum_conf */ 213 int plexsdno; /* and our number in our plex */ 214 /* (undefined if no plex) */ 215 u_int64_t reads; /* number of reads on this subdisk */ 216 u_int64_t writes; /* number of writes on this subdisk */ 217 u_int64_t bytes_read; /* number of bytes read */ 218 u_int64_t bytes_written; /* number of bytes written */ 219 /* revive parameters */ 220 u_int64_t revived; /* block number of current revive request */ 221 int revive_blocksize; /* revive block size (bytes) */ 222 int revive_interval; /* and time to wait between transfers */ 223 pid_t reviver; /* PID of reviving process */ 224 /* init parameters */ 225 u_int64_t initialized; /* block number of current init request */ 226 int init_blocksize; /* init block size (bytes) */ 227 int init_interval; /* and time to wait between transfers */ 228 #ifdef _KERNEL 229 struct request *waitlist; /* list of requests waiting on revive op */ 230 dev_t dev; /* associated device */ 231 #endif 232 }; 233 234 #ifdef _KERNEL 235 struct plex 236 #else 237 struct _plex 238 #endif 239 { 240 enum plexorg organization; /* Plex organization */ 241 enum plexstate state; /* and current state */ 242 u_int64_t length; /* total length of plex (sectors) */ 243 int flags; 244 int stripesize; /* size of stripe or raid band, in sectors */ 245 int subdisks; /* number of associated subdisks */ 246 int subdisks_allocated; /* number of subdisks allocated space for */ 247 int *sdnos; /* list of component subdisks */ 248 int plexno; /* index of plex in vinum_conf */ 249 int volno; /* index of volume */ 250 int volplexno; /* number of plex in volume */ 251 /* Statistics */ 252 u_int64_t reads; /* number of reads on this plex */ 253 u_int64_t writes; /* number of writes on this plex */ 254 u_int64_t bytes_read; /* number of bytes read */ 255 u_int64_t bytes_written; /* number of bytes written */ 256 u_int64_t recovered_reads; /* number of recovered read operations */ 257 u_int64_t degraded_writes; /* number of degraded writes */ 258 u_int64_t parityless_writes; /* number of parityless writes */ 259 u_int64_t multiblock; /* requests that needed more than one block */ 260 u_int64_t multistripe; /* requests that needed more than one stripe */ 261 int sddowncount; /* number of subdisks down */ 262 /* Lock information */ 263 int usedlocks; /* number currently in use */ 264 int lockwaits; /* and number of waits for locks */ 265 off_t checkblock; /* block number for parity op */ 266 char name[MAXPLEXNAME]; /* name of plex */ 267 #ifdef _KERNEL 268 struct rangelock *lock; /* ranges of locked addresses */ 269 struct mtx lockmtx; 270 dev_t dev; /* associated device */ 271 #endif 272 }; 273 274 #ifdef _KERNEL 275 struct volume 276 #else 277 struct _volume 278 #endif 279 { 280 char name[MAXVOLNAME]; /* name of volume */ 281 enum volumestate state; /* current state */ 282 int plexes; /* number of plexes */ 283 int preferred_plex; /* plex to read from, -1 for round-robin */ 284 /* 285 * index of plex used for last read, for 286 * round-robin. 287 */ 288 int last_plex_read; 289 int volno; /* volume number */ 290 int flags; /* status and configuration flags */ 291 int openflags; /* flags supplied to last open(2) */ 292 u_int64_t size; /* size of volume */ 293 int blocksize; /* logical block size */ 294 int active; /* number of outstanding requests active */ 295 int subops; /* and the number of suboperations */ 296 /* Statistics */ 297 u_int64_t bytes_read; /* number of bytes read */ 298 u_int64_t bytes_written; /* number of bytes written */ 299 u_int64_t reads; /* number of reads on this volume */ 300 u_int64_t writes; /* number of writes on this volume */ 301 u_int64_t recovered_reads; /* reads recovered from another plex */ 302 /* 303 * Unlike subdisks in the plex, space for the 304 * plex pointers is static. 305 */ 306 int plex[MAXPLEX]; /* index of plexes */ 307 #ifdef _KERNEL 308 dev_t dev; /* associated device */ 309 #endif 310 };
Cache object: b07f9f402ad3c754b6f5a1560a6b8fe7
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