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/vinum.c
Version:
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1 /*- 2 * Copyright (c) 1997, 1998 3 * Nan Yang Computer Services Limited. All rights reserved. 4 * 5 * Written by Greg Lehey 6 * 7 * This software is distributed under the so-called ``Berkeley 8 * License'': 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 Nan Yang Computer 21 * Services Limited. 22 * 4. Neither the name of the Company nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * This software is provided ``as is'', and any express or implied 27 * warranties, including, but not limited to, the implied warranties of 28 * merchantability and fitness for a particular purpose are disclaimed. 29 * In no event shall the company or contributors be liable for any 30 * direct, indirect, incidental, special, exemplary, or consequential 31 * damages (including, but not limited to, procurement of substitute 32 * goods or services; loss of use, data, or profits; or business 33 * interruption) however caused and on any theory of liability, whether 34 * in contract, strict liability, or tort (including negligence or 35 * otherwise) arising in any way out of the use of this software, even if 36 * advised of the possibility of such damage. 37 * 38 * $Id: vinum.c,v 1.1.1.1 2003/10/10 03:07:37 grog Exp $ 39 * $FreeBSD$ 40 */ 41 42 #define STATIC static /* nothing while we're testing XXX */ 43 44 #include <dev/vinum/vinumhdr.h> 45 #ifdef VINUMDEBUG 46 #include <sys/reboot.h> 47 int debug = 0; 48 extern int total_malloced; 49 extern int malloccount; 50 extern struct mc malloced[]; 51 #endif 52 #include <dev/vinum/request.h> 53 54 const struct cdevsw vinum_cdevsw = 55 { 56 vinumopen, vinumclose, vinumread, vinumwrite, vinumioctl, 57 nostop, notty, nopoll, nommap, nokqfilter, D_DISK 58 }; 59 60 const struct bdevsw vinum_bdevsw = 61 { 62 vinumopen, vinumclose, vinumstrategy, vinumioctl, 63 nodump, vinumsize, D_DISK 64 }; 65 66 /* Called by main() during pseudo-device attachment. */ 67 void vinumattach(void *); 68 69 struct _vinum_conf vinum_conf; /* configuration information */ 70 71 /* 72 * Called by main() during pseudo-device attachment. All we need 73 * to do is allocate enough space for devices to be configured later, and 74 * add devsw entries. 75 */ 76 void 77 vinumattach(void *dummy) 78 { 79 /* modload should prevent multiple loads, so this is worth a panic */ 80 if ((vinum_conf.flags & VF_LOADED) != 0) 81 panic("vinum: already loaded"); 82 83 log(LOG_INFO, "vinum: loaded\n"); 84 #ifdef VINUMDEBUG 85 vinum_conf.flags |= VF_LOADED | VF_HASDEBUG; /* we're loaded now, and we support debug */ 86 #else 87 vinum_conf.flags |= VF_LOADED; /* we're loaded now */ 88 #endif 89 90 daemonq = NULL; /* initialize daemon's work queue */ 91 dqend = NULL; 92 93 vinum_conf.version = VINUMVERSION; /* note what version we are */ 94 95 /* allocate space: drives... */ 96 DRIVE = (struct drive *) Malloc(sizeof(struct drive) * INITIAL_DRIVES); 97 CHECKALLOC(DRIVE, "vinum: no memory\n"); 98 bzero(DRIVE, sizeof(struct drive) * INITIAL_DRIVES); 99 vinum_conf.drives_allocated = INITIAL_DRIVES; /* number of drive slots allocated */ 100 vinum_conf.drives_used = 0; /* and number in use */ 101 102 /* volumes, ... */ 103 VOL = (struct volume *) Malloc(sizeof(struct volume) * INITIAL_VOLUMES); 104 CHECKALLOC(VOL, "vinum: no memory\n"); 105 bzero(VOL, sizeof(struct volume) * INITIAL_VOLUMES); 106 vinum_conf.volumes_allocated = INITIAL_VOLUMES; /* number of volume slots allocated */ 107 vinum_conf.volumes_used = 0; /* and number in use */ 108 109 /* plexes, ... */ 110 PLEX = (struct plex *) Malloc(sizeof(struct plex) * INITIAL_PLEXES); 111 CHECKALLOC(PLEX, "vinum: no memory\n"); 112 bzero(PLEX, sizeof(struct plex) * INITIAL_PLEXES); 113 vinum_conf.plexes_allocated = INITIAL_PLEXES; /* number of plex slots allocated */ 114 vinum_conf.plexes_used = 0; /* and number in use */ 115 116 /* and subdisks */ 117 SD = (struct sd *) Malloc(sizeof(struct sd) * INITIAL_SUBDISKS); 118 CHECKALLOC(SD, "vinum: no memory\n"); 119 bzero(SD, sizeof(struct sd) * INITIAL_SUBDISKS); 120 vinum_conf.subdisks_allocated = INITIAL_SUBDISKS; /* number of sd slots allocated */ 121 vinum_conf.subdisks_used = 0; /* and number in use */ 122 } 123 124 /* 125 * Check if we have anything open. If confopen is != 0, 126 * that goes for the super device as well, otherwise 127 * only for volumes. 128 * 129 * Return 0 if not inactive, 1 if inactive. 130 */ 131 int 132 vinum_inactive(int confopen) 133 { 134 int i; 135 int can_do = 1; /* assume we can do it */ 136 137 if (confopen && (vinum_conf.flags & VF_OPEN)) /* open by vinum(8)? */ 138 return 0; /* can't do it while we're open */ 139 lock_config(); 140 for (i = 0; i < vinum_conf.volumes_allocated; i++) { 141 if ((VOL[i].state > volume_down) 142 && (VOL[i].flags & VF_OPEN)) { /* volume is open */ 143 can_do = 0; 144 break; 145 } 146 } 147 unlock_config(); 148 return can_do; 149 } 150 151 /* 152 * Free all structures. 153 * If cleardrive is 0, save the configuration; otherwise 154 * remove the configuration from the drive. 155 * 156 * Before coming here, ensure that no volumes are open. 157 */ 158 void 159 free_vinum(int cleardrive) 160 { 161 int i; 162 int drives_allocated = vinum_conf.drives_allocated; 163 164 if (DRIVE != NULL) { 165 if (cleardrive) { /* remove the vinum config */ 166 for (i = 0; i < drives_allocated; i++) 167 remove_drive(i); /* remove the drive */ 168 } else { /* keep the config */ 169 for (i = 0; i < drives_allocated; i++) 170 free_drive(&DRIVE[i]); /* close files and things */ 171 } 172 Free(DRIVE); 173 } 174 while ((vinum_conf.flags & (VF_STOPPING | VF_DAEMONOPEN)) 175 == (VF_STOPPING | VF_DAEMONOPEN)) { /* at least one daemon open, we're stopping */ 176 queue_daemon_request(daemonrq_return, (union daemoninfo) 0); /* stop the daemon */ 177 tsleep(&vinumclose, PUSER, "vstop", 1); /* and wait for it */ 178 } 179 if (SD != NULL) { 180 for (i = 0; i < vinum_conf.subdisks_allocated; i++) { 181 struct sd *sd = &SD[i]; 182 183 if (sd->state != sd_unallocated) 184 free_sd(i); 185 } 186 Free(SD); 187 } 188 if (PLEX != NULL) { 189 for (i = 0; i < vinum_conf.plexes_allocated; i++) { 190 struct plex *plex = &PLEX[i]; 191 192 if (plex->state != plex_unallocated) /* we have real data there */ 193 free_plex(i); 194 } 195 Free(PLEX); 196 } 197 if (VOL != NULL) { 198 for (i = 0; i < vinum_conf.volumes_allocated; i++) { 199 struct volume *volume = &VOL[i]; 200 201 if (volume->state != volume_unallocated) 202 free_volume(i); 203 } 204 Free(VOL); 205 } 206 bzero(&vinum_conf, sizeof(vinum_conf)); 207 vinum_conf.version = VINUMVERSION; /* reinstate version number */ 208 } 209 210 211 /* ARGSUSED */ 212 /* Open a vinum object */ 213 int 214 vinumopen(dev_t dev, 215 int flags, 216 int fmt, 217 struct proc *p) 218 { 219 int error; 220 unsigned int index; 221 struct volume *vol; 222 struct plex *plex; 223 struct sd *sd; 224 int devminor; /* minor number */ 225 226 devminor = minor(dev); 227 error = 0; 228 /* First, decide what we're looking at */ 229 switch (DEVTYPE(dev)) { 230 case VINUM_VOLUME_TYPE: 231 /* 232 * The super device and daemon device are the last two 233 * volume numbers, so check for them first. 234 */ 235 if ((devminor == VINUM_DAEMON_VOL) /* daemon device */ 236 ||(devminor == VINUM_SUPERDEV_VOL)) { /* or normal super device */ 237 error = suser(p->p_ucred, &p->p_acflag); /* are we root? */ 238 239 if (error == 0) { /* yes, can do */ 240 if (devminor == VINUM_DAEMON_VOL) /* daemon device */ 241 vinum_conf.flags |= VF_DAEMONOPEN; /* we're open */ 242 else if (devminor == VINUM_SUPERDEV_VOL) 243 vinum_conf.flags |= VF_OPEN; /* we're open */ 244 } 245 return error; 246 } 247 /* Must be a real volume. Check. */ 248 index = Volno(dev); 249 if (index >= vinum_conf.volumes_allocated) 250 return ENXIO; /* no such device */ 251 vol = &VOL[index]; 252 253 switch (vol->state) { 254 case volume_unallocated: 255 case volume_uninit: 256 return ENXIO; 257 258 case volume_up: 259 vol->flags |= VF_OPEN; /* note we're open */ 260 return 0; 261 262 case volume_down: 263 return EIO; 264 265 default: 266 return EINVAL; 267 } 268 269 case VINUM_PLEX_TYPE: 270 index = Plexno(dev); /* get plex index in vinum_conf */ 271 if (index >= vinum_conf.plexes_allocated) 272 return ENXIO; /* no such device */ 273 plex = &PLEX[index]; 274 275 switch (plex->state) { 276 case plex_unallocated: 277 return ENXIO; 278 279 case plex_referenced: 280 return EINVAL; 281 282 default: 283 plex->flags |= VF_OPEN; /* note we're open */ 284 return 0; 285 } 286 287 case VINUM_SD_TYPE: 288 case VINUM_SD2_TYPE: 289 index = Sdno(dev); /* get the subdisk number */ 290 if (index >= vinum_conf.subdisks_allocated) /* not a valid SD entry */ 291 return ENXIO; /* no such device */ 292 sd = &SD[index]; 293 294 /* 295 * Opening a subdisk is always a special operation, so 296 * we ignore the state as long as it represents a real 297 * subdisk. 298 */ 299 switch (sd->state) { 300 case sd_unallocated: 301 return ENXIO; 302 303 case sd_uninit: 304 case sd_referenced: 305 return EINVAL; 306 307 default: 308 sd->flags |= VF_OPEN; /* note we're open */ 309 return 0; 310 } 311 } 312 return 0; /* to keep the compiler happy */ 313 } 314 315 /* ARGSUSED */ 316 int 317 vinumclose(dev_t dev, 318 int flags, 319 int fmt, 320 struct proc *p) 321 { 322 unsigned int index; 323 struct volume *vol; 324 int devminor; 325 326 devminor = minor(dev); 327 /* First, decide what we're looking at */ 328 switch (DEVTYPE(dev)) { 329 case VINUM_VOLUME_TYPE: 330 /* 331 * The super device and daemon device are the last two 332 * volume numbers, so check for them first. 333 */ 334 if ((devminor == VINUM_DAEMON_VOL) /* daemon device */ 335 ||(devminor == VINUM_SUPERDEV_VOL)) { /* or normal super device */ 336 /* 337 * don't worry about whether we're root: 338 * nobody else would get this far. 339 */ 340 if (devminor == VINUM_SUPERDEV_VOL) /* normal superdev */ 341 vinum_conf.flags &= ~VF_OPEN; /* no longer open */ 342 else { /* the daemon device */ 343 vinum_conf.flags &= ~VF_DAEMONOPEN; /* no longer open */ 344 if (vinum_conf.flags & VF_STOPPING) /* we're trying to stop, */ 345 wakeup(&vinumclose); /* we can continue now */ 346 } 347 return 0; 348 } 349 /* Real volume */ 350 index = Volno(dev); 351 if (index >= vinum_conf.volumes_allocated) 352 return ENXIO; /* no such device */ 353 vol = &VOL[index]; 354 355 switch (vol->state) { 356 case volume_unallocated: 357 case volume_uninit: 358 return ENXIO; 359 360 case volume_up: 361 vol->flags &= ~VF_OPEN; /* reset our flags */ 362 return 0; 363 364 case volume_down: 365 return EIO; 366 367 default: 368 return EINVAL; 369 } 370 371 case VINUM_PLEX_TYPE: 372 if (Volno(dev) >= vinum_conf.volumes_allocated) 373 return ENXIO; 374 /* FALLTHROUGH */ 375 376 case VINUM_SD_TYPE: 377 if ((Volno(dev) >= vinum_conf.volumes_allocated) || /* no such volume */ 378 (Plexno(dev) >= vinum_conf.plexes_allocated)) /* or no such plex */ 379 return ENXIO; /* no such device */ 380 /* FALLTHROUGH */ 381 382 default: 383 return ENODEV; /* don't know what to do with these */ 384 } 385 } 386 387 388 /* size routine */ 389 int 390 vinumsize(dev_t dev) 391 { 392 struct volume *vol; 393 int size; 394 395 vol = &VOL[Volno(dev)]; 396 397 if (vol->state == volume_up) 398 size = vol->size; 399 else 400 return 0; /* err on the size of conservatism */ 401 402 return size; 403 } 404 405 int 406 vinumdump(dev_t dev, daddr_t da, caddr_t ca, size_t size) 407 { 408 return ENXIO; /* Implement this! XXX. */ 409 } 410 411 /* Local Variables: */ 412 /* fill-column: 60 */ 413 /* End: */
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