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
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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 1.32 2000/05/10 07:54:29 grog Exp grog $ 39 * $FreeBSD$ 40 */ 41 42 #define STATIC static /* nothing while we're testing XXX */ 43 44 #define REALLYKERNEL 45 #include "opt_vinum.h" 46 #include <dev/vinum/vinumhdr.h> 47 #include <sys/sysproto.h> /* for sync(2) */ 48 #include <sys/devicestat.h> 49 #ifdef VINUMDEBUG 50 #include <sys/reboot.h> 51 int debug = 0; 52 extern int total_malloced; 53 extern int malloccount; 54 extern struct mc malloced[]; 55 #endif 56 #include <dev/vinum/request.h> 57 58 STATIC struct cdevsw vinum_cdevsw = 59 { 60 vinumopen, vinumclose, vinumread, vinumwrite, 61 vinumioctl, nostop, nullreset, nodevtotty, 62 seltrue, nommap, vinumstrategy, "vinum", 63 NULL, -1, vinumdump, vinumsize, 64 D_DISK, 0, -1 65 }; 66 67 /* Called by main() during pseudo-device attachment. */ 68 STATIC void vinumattach(void *); 69 70 #ifndef ACTUALLY_LKM_NOT_KERNEL 71 STATIC int vinum_modevent(module_t mod, modeventtype_t type, void *unused); 72 #endif 73 74 struct _vinum_conf vinum_conf; /* configuration information */ 75 76 /* 77 * Called by main() during pseudo-device attachment. All we need 78 * to do is allocate enough space for devices to be configured later, and 79 * add devsw entries. 80 */ 81 void 82 vinumattach(void *dummy) 83 { 84 /* modload should prevent multiple loads, so this is worth a panic */ 85 if ((vinum_conf.flags & VF_LOADED) != 0) 86 panic("vinum: already loaded"); 87 88 log(LOG_INFO, "vinum: loaded\n"); 89 vinum_conf.flags |= VF_LOADED; /* we're loaded now */ 90 91 daemonq = NULL; /* initialize daemon's work queue */ 92 dqend = NULL; 93 94 cdevsw_add_generic(VINUM_BDEV_MAJOR, VINUM_CDEV_MAJOR, &vinum_cdevsw); 95 96 /* allocate space: drives... */ 97 DRIVE = (struct drive *) Malloc(sizeof(struct drive) * INITIAL_DRIVES); 98 CHECKALLOC(DRIVE, "vinum: no memory\n"); 99 bzero(DRIVE, sizeof(struct drive) * INITIAL_DRIVES); 100 vinum_conf.drives_allocated = INITIAL_DRIVES; /* number of drive slots allocated */ 101 vinum_conf.drives_used = 0; /* and number in use */ 102 103 /* volumes, ... */ 104 VOL = (struct volume *) Malloc(sizeof(struct volume) * INITIAL_VOLUMES); 105 CHECKALLOC(VOL, "vinum: no memory\n"); 106 bzero(VOL, sizeof(struct volume) * INITIAL_VOLUMES); 107 vinum_conf.volumes_allocated = INITIAL_VOLUMES; /* number of volume slots allocated */ 108 vinum_conf.volumes_used = 0; /* and number in use */ 109 110 /* plexes, ... */ 111 PLEX = (struct plex *) Malloc(sizeof(struct plex) * INITIAL_PLEXES); 112 CHECKALLOC(PLEX, "vinum: no memory\n"); 113 bzero(PLEX, sizeof(struct plex) * INITIAL_PLEXES); 114 vinum_conf.plexes_allocated = INITIAL_PLEXES; /* number of plex slots allocated */ 115 vinum_conf.plexes_used = 0; /* and number in use */ 116 117 /* and subdisks */ 118 SD = (struct sd *) Malloc(sizeof(struct sd) * INITIAL_SUBDISKS); 119 CHECKALLOC(SD, "vinum: no memory\n"); 120 bzero(SD, sizeof(struct sd) * INITIAL_SUBDISKS); 121 vinum_conf.subdisks_allocated = INITIAL_SUBDISKS; /* number of sd slots allocated */ 122 vinum_conf.subdisks_used = 0; /* and number in use */ 123 } 124 125 /* 126 * Check if we have anything open. If confopen is != 0, 127 * that goes for the super device as well, otherwise 128 * only for volumes. 129 * 130 * Return 0 if not inactive, 1 if inactive. 131 */ 132 int 133 vinum_inactive(int confopen) 134 { 135 int i; 136 int can_do = 1; /* assume we can do it */ 137 138 if (confopen && (vinum_conf.flags & VF_OPEN)) /* open by vinum(8)? */ 139 return 0; /* can't do it while we're open */ 140 lock_config(); 141 for (i = 0; i < vinum_conf.volumes_allocated; i++) { 142 if ((VOL[i].state > volume_down) 143 && (VOL[i].flags & VF_OPEN)) { /* volume is open */ 144 can_do = 0; 145 break; 146 } 147 } 148 unlock_config(); 149 return can_do; 150 } 151 152 /* 153 * Free all structures. 154 * If cleardrive is 0, save the configuration; otherwise 155 * remove the configuration from the drive. 156 * 157 * Before coming here, ensure that no volumes are open. 158 */ 159 void 160 free_vinum(int cleardrive) 161 { 162 int i; 163 int drives_allocated = vinum_conf.drives_allocated; 164 165 if (DRIVE != NULL) { 166 if (cleardrive) { /* remove the vinum config */ 167 for (i = 0; i < drives_allocated; i++) 168 remove_drive(i); /* remove the drive */ 169 } else { /* keep the config */ 170 for (i = 0; i < drives_allocated; i++) 171 free_drive(&DRIVE[i]); /* close files and things */ 172 } 173 Free(DRIVE); 174 } 175 while ((vinum_conf.flags & (VF_STOPPING | VF_DAEMONOPEN)) 176 == (VF_STOPPING | VF_DAEMONOPEN)) { /* at least one daemon open, we're stopping */ 177 queue_daemon_request(daemonrq_return, (union daemoninfo) 0); /* stop the daemon */ 178 tsleep(&vinumclose, PUSER, "vstop", 1); /* and wait for it */ 179 } 180 if (SD != NULL) 181 Free(SD); 182 if (PLEX != NULL) { 183 for (i = 0; i < vinum_conf.plexes_allocated; i++) { 184 struct plex *plex = &vinum_conf.plex[i]; 185 186 if (plex->state != plex_unallocated) { /* we have real data there */ 187 if (plex->sdnos) 188 Free(plex->sdnos); 189 } 190 } 191 Free(PLEX); 192 } 193 if (VOL != NULL) 194 Free(VOL); 195 bzero(&vinum_conf, sizeof(vinum_conf)); 196 } 197 198 STATIC int 199 vinum_modevent(module_t mod, modeventtype_t type, void *unused) 200 { 201 struct sync_args dummyarg = 202 {0}; 203 204 switch (type) { 205 case MOD_LOAD: 206 vinumattach(NULL); 207 return 0; /* OK */ 208 case MOD_UNLOAD: 209 if (!vinum_inactive(1)) /* is anything open? */ 210 return EBUSY; /* yes, we can't do it */ 211 vinum_conf.flags |= VF_STOPPING; /* note that we want to stop */ 212 sync(curproc, &dummyarg); /* write out buffers */ 213 free_vinum(0); /* clean up */ 214 #ifdef VINUMDEBUG 215 if (total_malloced) { 216 int i; 217 #ifdef INVARIANTS 218 int *poke; 219 #endif 220 221 for (i = 0; i < malloccount; i++) { 222 if (debug & DEBUG_WARNINGS) /* want to hear about them */ 223 log(LOG_WARNING, 224 "vinum: exiting with %d bytes malloced from %s:%d\n", 225 malloced[i].size, 226 malloced[i].file, 227 malloced[i].line); 228 #ifdef INVARIANTS 229 poke = &((int *) malloced[i].address) 230 [malloced[i].size / (2 * sizeof(int))]; /* middle of the area */ 231 if (*poke == 0xdeadc0de) /* already freed */ 232 log(LOG_ERR, 233 "vinum: exiting with malloc table inconsistency at %p from %s:%d\n", 234 malloced[i].address, 235 malloced[i].file, 236 malloced[i].line); 237 #endif 238 Free(malloced[i].address); 239 } 240 } 241 #endif 242 cdevsw[VINUM_CDEV_MAJOR] = NULL; /* no cdevsw any more */ 243 bdevsw[VINUM_BDEV_MAJOR] = NULL; /* nor bdevsw */ 244 log(LOG_INFO, "vinum: unloaded\n"); /* tell the world */ 245 return 0; 246 default: 247 break; 248 } 249 return 0; 250 } 251 252 moduledata_t vinum_mod = 253 { 254 "vinum", 255 (modeventhand_t) vinum_modevent, 256 0 257 }; 258 DECLARE_MODULE(vinum, vinum_mod, SI_SUB_VINUM, SI_ORDER_MIDDLE); 259 260 /* ARGSUSED */ 261 /* Open a vinum object */ 262 int 263 vinumopen(dev_t dev, 264 int flags, 265 int fmt, 266 struct proc *p) 267 { 268 int error; 269 unsigned int index; 270 struct volume *vol; 271 struct plex *plex; 272 struct sd *sd; 273 int devminor; /* minor number */ 274 275 devminor = minor(dev); 276 error = 0; 277 /* First, decide what we're looking at */ 278 switch (DEVTYPE(dev)) { 279 case VINUM_VOLUME_TYPE: 280 index = Volno(dev); 281 if (index >= vinum_conf.volumes_allocated) 282 return ENXIO; /* no such device */ 283 vol = &VOL[index]; 284 285 switch (vol->state) { 286 case volume_unallocated: 287 case volume_uninit: 288 return ENXIO; 289 290 case volume_up: 291 vol->flags |= VF_OPEN; /* note we're open */ 292 return 0; 293 294 case volume_down: 295 return EIO; 296 297 default: 298 return EINVAL; 299 } 300 301 case VINUM_PLEX_TYPE: 302 if (Volno(dev) >= vinum_conf.volumes_allocated) 303 return ENXIO; 304 /* FALLTHROUGH */ 305 306 case VINUM_RAWPLEX_TYPE: 307 index = Plexno(dev); /* get plex index in vinum_conf */ 308 if (index >= vinum_conf.plexes_allocated) 309 return ENXIO; /* no such device */ 310 plex = &PLEX[index]; 311 312 switch (plex->state) { 313 case plex_referenced: 314 case plex_unallocated: 315 return EINVAL; 316 317 default: 318 plex->flags |= VF_OPEN; /* note we're open */ 319 return 0; 320 } 321 322 case VINUM_SD_TYPE: 323 if ((Volno(dev) >= vinum_conf.volumes_allocated) /* no such volume */ 324 ||(Plexno(dev) >= vinum_conf.plexes_allocated)) /* or no such plex */ 325 return ENXIO; /* no such device */ 326 327 /* FALLTHROUGH */ 328 329 case VINUM_RAWSD_TYPE: 330 index = Sdno(dev); /* get the subdisk number */ 331 if ((index >= vinum_conf.subdisks_allocated) /* not a valid SD entry */ 332 ||(SD[index].state < sd_init)) /* or SD is not real */ 333 return ENXIO; /* no such device */ 334 sd = &SD[index]; 335 336 /* 337 * Opening a subdisk is always a special operation, so we 338 * ignore the state as long as it represents a real subdisk 339 */ 340 switch (sd->state) { 341 case sd_unallocated: 342 case sd_uninit: 343 return EINVAL; 344 345 default: 346 sd->flags |= VF_OPEN; /* note we're open */ 347 return 0; 348 } 349 350 case VINUM_SUPERDEV_TYPE: 351 error = suser(p->p_ucred, &p->p_acflag); /* are we root? */ 352 if (error == 0) { /* yes, can do */ 353 if (devminor == VINUM_DAEMON_DEV) /* daemon device */ 354 vinum_conf.flags |= VF_DAEMONOPEN; /* we're open */ 355 else if (devminor == VINUM_SUPERDEV) 356 vinum_conf.flags |= VF_OPEN; /* we're open */ 357 else 358 error = ENODEV; /* nothing, maybe a debug mismatch */ 359 } 360 return error; 361 362 /* Vinum drives are disks. We already have a disk 363 * driver, so don't handle them here */ 364 case VINUM_DRIVE_TYPE: 365 default: 366 return ENODEV; /* don't know what to do with these */ 367 } 368 } 369 370 /* ARGSUSED */ 371 int 372 vinumclose(dev_t dev, 373 int flags, 374 int fmt, 375 struct proc *p) 376 { 377 unsigned int index; 378 struct volume *vol; 379 int devminor; 380 381 devminor = minor(dev); 382 index = Volno(dev); 383 /* First, decide what we're looking at */ 384 switch (DEVTYPE(dev)) { 385 case VINUM_VOLUME_TYPE: 386 if (index >= vinum_conf.volumes_allocated) 387 return ENXIO; /* no such device */ 388 vol = &VOL[index]; 389 390 switch (vol->state) { 391 case volume_unallocated: 392 case volume_uninit: 393 return ENXIO; 394 395 case volume_up: 396 vol->flags &= ~VF_OPEN; /* reset our flags */ 397 return 0; 398 399 case volume_down: 400 return EIO; 401 402 default: 403 return EINVAL; 404 } 405 406 case VINUM_PLEX_TYPE: 407 if (Volno(dev) >= vinum_conf.volumes_allocated) 408 return ENXIO; 409 /* FALLTHROUGH */ 410 411 case VINUM_RAWPLEX_TYPE: 412 index = Plexno(dev); /* get plex index in vinum_conf */ 413 if (index >= vinum_conf.plexes_allocated) 414 return ENXIO; /* no such device */ 415 PLEX[index].flags &= ~VF_OPEN; /* reset our flags */ 416 return 0; 417 418 case VINUM_SD_TYPE: 419 if ((Volno(dev) >= vinum_conf.volumes_allocated) || /* no such volume */ 420 (Plexno(dev) >= vinum_conf.plexes_allocated)) /* or no such plex */ 421 return ENXIO; /* no such device */ 422 /* FALLTHROUGH */ 423 424 case VINUM_RAWSD_TYPE: 425 index = Sdno(dev); /* get the subdisk number */ 426 if (index >= vinum_conf.subdisks_allocated) 427 return ENXIO; /* no such device */ 428 SD[index].flags &= ~VF_OPEN; /* reset our flags */ 429 return 0; 430 431 case VINUM_SUPERDEV_TYPE: 432 /* 433 * don't worry about whether we're root: 434 * nobody else would get this far. 435 */ 436 if (devminor == VINUM_SUPERDEV) /* normal superdev */ 437 vinum_conf.flags &= ~VF_OPEN; /* no longer open */ 438 else if (devminor == VINUM_DAEMON_DEV) { /* the daemon device */ 439 vinum_conf.flags &= ~VF_DAEMONOPEN; /* no longer open */ 440 if (vinum_conf.flags & VF_STOPPING) /* we're stopping, */ 441 wakeup(&vinumclose); /* we can continue stopping now */ 442 } 443 return 0; 444 445 case VINUM_DRIVE_TYPE: 446 default: 447 return ENODEV; /* don't know what to do with these */ 448 } 449 } 450 451 /* size routine */ 452 int 453 vinumsize(dev_t dev) 454 { 455 struct volume *vol; 456 int size; 457 458 vol = &VOL[Volno(dev)]; 459 460 if (vol->state == volume_up) 461 size = vol->size; 462 else 463 return 0; /* err on the size of conservatism */ 464 465 return size; 466 } 467 468 int 469 vinumdump(dev_t dev) 470 { 471 /* Not implemented. */ 472 return ENXIO; 473 } 474 475 /* Local Variables: */ 476 /* fill-column: 50 */ 477 /* End: */
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