1 /*- 2 * Copyright (c) 1997, 1998 3 * Nan Yang Computer Services Limited. All rights reserved. 4 * 5 * This software is distributed under the so-called ``Berkeley 6 * License'': 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Nan Yang Computer 19 * Services Limited. 20 * 4. Neither the name of the Company nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * This software is provided ``as is'', and any express or implied 25 * warranties, including, but not limited to, the implied warranties of 26 * merchantability and fitness for a particular purpose are disclaimed. 27 * In no event shall the company or contributors be liable for any 28 * direct, indirect, incidental, special, exemplary, or consequential 29 * damages (including, but not limited to, procurement of substitute 30 * goods or services; loss of use, data, or profits; or business 31 * interruption) however caused and on any theory of liability, whether 32 * in contract, strict liability, or tort (including negligence or 33 * otherwise) arising in any way out of the use of this software, even if 34 * advised of the possibility of such damage. 35 * 36 * $Id: vinumio.c,v 1.30 2000/05/10 23:23:30 grog Exp grog $ 37 * $FreeBSD: src/sys/dev/vinum/vinumio.c,v 1.52.2.6 2002/05/02 08:43:44 grog Exp $ 38 * $DragonFly: src/sys/dev/raid/vinum/vinumio.c,v 1.30 2007/12/09 17:23:53 corecode Exp $ 39 */ 40 41 #include "vinumhdr.h" 42 #include "request.h" 43 #include <vm/vm_zone.h> 44 #include <sys/nlookup.h> 45 46 static char *sappend(char *txt, char *s); 47 static int drivecmp(const void *va, const void *vb); 48 49 /* 50 * Open the device associated with the drive, and set drive's vp. 51 * Return an error number 52 */ 53 int 54 open_drive(struct drive *drive, struct proc *p, int verbose) 55 { 56 struct nlookupdata nd; 57 int error; 58 const char *dname; 59 60 /* 61 * Fail if already open 62 */ 63 if (drive->flags & VF_OPEN) 64 return EBUSY; 65 dname = drive->devicename; 66 67 /* 68 * Severe hack to disallow opening partition 'c' 69 */ 70 if (strncmp(dname, "/dev", 4) == 0 && dname[strlen(dname)-1] == 'c') 71 return ENOTTY; 72 73 if (rootdev) { 74 /* 75 * Open via filesystem (future) 76 */ 77 error = nlookup_init(&nd, drive->devicename, UIO_SYSSPACE, NLC_FOLLOW); 78 if (error) 79 return error; 80 error = vn_open(&nd, NULL, FREAD|FWRITE, 0); 81 drive->vp = nd.nl_open_vp; 82 nd.nl_open_vp = NULL; 83 nlookup_done(&nd); 84 } else { 85 /* 86 * Open via synthesized vnode backed by disk device 87 */ 88 error = vn_opendisk(drive->devicename, FREAD|FWRITE, &drive->vp); 89 if (error) 90 return error; 91 } 92 93 if (error == 0 && drive->vp == NULL) 94 error = ENODEV; 95 96 /* 97 * A huge amount of pollution all over vinum requires that our low 98 * level drive be a device. 99 */ 100 if (error == 0 && drive->vp->v_type != VCHR) { 101 vn_close(drive->vp, FREAD|FWRITE); 102 drive->vp = NULL; 103 error = ENODEV; 104 } 105 if (error) { 106 drive->state = drive_down; 107 if (verbose) { 108 log(LOG_WARNING, 109 "vinum open_drive %s: failed with error %d\n", 110 drive->devicename, error); 111 } 112 } else { 113 drive->dev = drive->vp->v_rdev; 114 drive->flags |= VF_OPEN; 115 } 116 drive->lasterror = error; 117 return error; 118 } 119 120 /* 121 * Set some variables in the drive struct 122 * in more convenient form. Return error indication 123 */ 124 int 125 set_drive_parms(struct drive *drive) 126 { 127 drive->blocksize = BLKDEV_IOSIZE; /* do we need this? */ 128 drive->secsperblock = drive->blocksize /* number of sectors per block */ 129 / drive->partinfo.media_blksize; 130 131 /* Now update the label part */ 132 bcopy(hostname, drive->label.sysname, VINUMHOSTNAMELEN); /* put in host name */ 133 getmicrotime(&drive->label.date_of_birth); /* and current time */ 134 drive->label.drive_size = drive->partinfo.media_size; 135 #if VINUMDEBUG 136 if (debug & DEBUG_BIGDRIVE) /* pretend we're 100 times as big */ 137 drive->label.drive_size *= 100; 138 #endif 139 140 /* number of sectors available for subdisks */ 141 drive->sectors_available = drive->label.drive_size / DEV_BSIZE - DATASTART; 142 143 /* 144 * Bug in 3.0 as of January 1998: you can open 145 * non-existent slices. They have a length of 0. 146 */ 147 if (drive->label.drive_size < MINVINUMSLICE) { /* too small to worry about */ 148 set_drive_state(drive->driveno, drive_down, setstate_force); 149 drive->lasterror = ENOSPC; 150 return ENOSPC; 151 } 152 drive->freelist_size = INITIAL_DRIVE_FREELIST; /* initial number of entries */ 153 drive->freelist = (struct drive_freelist *) 154 Malloc(INITIAL_DRIVE_FREELIST * sizeof(struct drive_freelist)); 155 if (drive->freelist == NULL) /* can't malloc, dammit */ 156 return ENOSPC; 157 drive->freelist_entries = 1; /* just (almost) the complete drive */ 158 drive->freelist[0].offset = DATASTART; /* starts here */ 159 drive->freelist[0].sectors = (drive->label.drive_size >> DEV_BSHIFT) - DATASTART; /* and it's this long */ 160 if (drive->label.name[0] != '\0') /* got a name */ 161 set_drive_state(drive->driveno, drive_up, setstate_force); /* our drive is accessible */ 162 else /* we know about it, but that's all */ 163 drive->state = drive_referenced; 164 return 0; 165 } 166 167 /* 168 * Initialize a drive: open the device and add device 169 * information 170 */ 171 int 172 init_drive(struct drive *drive, int verbose) 173 { 174 if (drive->devicename[0] != '/') { 175 drive->lasterror = EINVAL; 176 log(LOG_ERR, "vinum: Can't open drive without drive name\n"); 177 return EINVAL; 178 } 179 drive->lasterror = open_drive(drive, curproc, verbose); /* open the drive */ 180 if (drive->lasterror) 181 return drive->lasterror; 182 183 drive->lasterror = VOP_IOCTL(drive->vp, DIOCGPART, 184 (caddr_t)&drive->partinfo, 185 FREAD|FWRITE, proc0.p_ucred); 186 if (drive->lasterror) { 187 if (verbose) 188 log(LOG_WARNING, 189 "vinum open_drive %s: Can't get partition information, drive->lasterror %d\n", 190 drive->devicename, 191 drive->lasterror); 192 close_drive(drive); 193 return drive->lasterror; 194 } 195 if (drive->partinfo.fstype != FS_VINUM && 196 !kuuid_is_vinum(&drive->partinfo.fstype_uuid) 197 ) { 198 drive->lasterror = EFTYPE; 199 if (verbose) 200 log(LOG_WARNING, 201 "vinum open_drive %s: Wrong partition type for vinum\n", 202 drive->devicename); 203 close_drive(drive); 204 return EFTYPE; 205 } 206 return set_drive_parms(drive); /* set various odds and ends */ 207 } 208 209 /* Close a drive if it's open. */ 210 void 211 close_drive(struct drive *drive) 212 { 213 LOCKDRIVE(drive); /* keep the daemon out */ 214 if (drive->flags & VF_OPEN) 215 close_locked_drive(drive); /* and close it */ 216 if (drive->state > drive_down) /* if it's up */ 217 drive->state = drive_down; /* make sure it's down */ 218 unlockdrive(drive); 219 } 220 221 /* 222 * Real drive close code, called with drive already locked. 223 * We have also checked that the drive is open. No errors. 224 */ 225 void 226 close_locked_drive(struct drive *drive) 227 { 228 /* 229 * If we can't access the drive, we can't flush 230 * the queues, which spec_close() will try to 231 * do. Get rid of them here first. 232 */ 233 if (drive->vp) { 234 drive->lasterror = vn_close(drive->vp, FREAD|FWRITE); 235 drive->vp = NULL; 236 } 237 drive->flags &= ~VF_OPEN; 238 } 239 240 /* 241 * Remove drive from the configuration. 242 * Caller must ensure that it isn't active. 243 */ 244 void 245 remove_drive(int driveno) 246 { 247 struct drive *drive = &vinum_conf.drive[driveno]; 248 struct vinum_hdr *vhdr; /* buffer for header */ 249 int error; 250 251 if (drive->state > drive_referenced) { /* real drive */ 252 if (drive->state == drive_up) { 253 vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* allocate buffer */ 254 CHECKALLOC(vhdr, "Can't allocate memory"); 255 error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET); 256 if (error) 257 drive->lasterror = error; 258 else { 259 vhdr->magic = VINUM_NOMAGIC; /* obliterate the magic, but leave the rest */ 260 write_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET); 261 } 262 Free(vhdr); 263 } 264 free_drive(drive); /* close it and free resources */ 265 save_config(); /* and save the updated configuration */ 266 } 267 } 268 269 /* 270 * Transfer drive data. Usually called from one of these defines; 271 * #define read_drive(a, b, c, d) driveio (a, b, c, d, BUF_CMD_READ) 272 * #define write_drive(a, b, c, d) driveio (a, b, c, d, BUF_CMD_WRITE) 273 * 274 * length and offset are in bytes, but must be multiples of sector 275 * size. The function *does not check* for this condition, and 276 * truncates ruthlessly. 277 * Return error number 278 */ 279 int 280 driveio(struct drive *drive, char *buf, size_t length, off_t offset, buf_cmd_t cmd) 281 { 282 int error; 283 struct buf *bp; 284 caddr_t saveaddr; 285 286 error = 0; /* to keep the compiler happy */ 287 while (length) { /* divide into small enough blocks */ 288 int len = min(length, MAXBSIZE); /* maximum block device transfer is MAXBSIZE */ 289 290 bp = geteblk(len); /* get a buffer header */ 291 bp->b_cmd = cmd; 292 bp->b_bio1.bio_offset = offset; /* disk offset */ 293 saveaddr = bp->b_data; 294 bp->b_data = buf; 295 bp->b_bcount = len; 296 vn_strategy(drive->vp, &bp->b_bio1); 297 error = biowait(bp); 298 bp->b_data = saveaddr; 299 bp->b_flags |= B_INVAL | B_AGE; 300 bp->b_flags &= ~B_ERROR; 301 brelse(bp); 302 if (error) 303 break; 304 length -= len; /* update pointers */ 305 buf += len; 306 offset += len; 307 } 308 return error; 309 } 310 311 /* 312 * Check a drive for a vinum header. If found, 313 * update the drive information. We come here 314 * with a partially populated drive structure 315 * which includes the device name. 316 * 317 * Return information on what we found. 318 * 319 * This function is called from two places: check_drive, 320 * which wants to find out whether the drive is a 321 * Vinum drive, and config_drive, which asserts that 322 * it is a vinum drive. In the first case, we don't 323 * print error messages (verbose==0), in the second 324 * we do (verbose==1). 325 */ 326 enum drive_label_info 327 read_drive_label(struct drive *drive, int verbose) 328 { 329 int error; 330 int result; /* result of our search */ 331 struct vinum_hdr *vhdr; /* and as header */ 332 333 error = init_drive(drive, 0); /* find the drive */ 334 if (error) /* find the drive */ 335 return DL_CANT_OPEN; /* not ours */ 336 337 vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* allocate buffers */ 338 CHECKALLOC(vhdr, "Can't allocate memory"); 339 340 drive->state = drive_up; /* be optimistic */ 341 error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET); 342 if (vhdr->magic == VINUM_MAGIC) { /* ours! */ 343 if (drive->label.name[0] /* we have a name for this drive */ 344 &&(strcmp(drive->label.name, vhdr->label.name))) { /* but it doesn't match the real name */ 345 drive->lasterror = EINVAL; 346 result = DL_WRONG_DRIVE; /* it's the wrong drive */ 347 drive->state = drive_unallocated; /* put it back, it's not ours */ 348 } else 349 result = DL_OURS; 350 /* 351 * We copy the drive anyway so that we have 352 * the correct name in the drive info. This 353 * may not be the name specified 354 */ 355 drive->label = vhdr->label; /* put in the label information */ 356 } else if (vhdr->magic == VINUM_NOMAGIC) /* was ours, but we gave it away */ 357 result = DL_DELETED_LABEL; /* and return the info */ 358 else 359 result = DL_NOT_OURS; /* we could have it, but we don't yet */ 360 Free(vhdr); /* that's all. */ 361 return result; 362 } 363 364 /* 365 * Check a drive for a vinum header. If found, 366 * read configuration information from the drive and 367 * incorporate the data into the configuration. 368 * 369 * Return drive number. 370 */ 371 struct drive * 372 check_drive(char *devicename) 373 { 374 int driveno; 375 int i; 376 struct drive *drive; 377 378 driveno = find_drive_by_dev(devicename, 1); /* if entry doesn't exist, create it */ 379 drive = &vinum_conf.drive[driveno]; /* and get a pointer */ 380 381 if (read_drive_label(drive, 0) == DL_OURS) { /* one of ours */ 382 for (i = 0; i < vinum_conf.drives_allocated; i++) { /* see if the name already exists */ 383 if ((i != driveno) /* not this drive */ 384 &&(DRIVE[i].state != drive_unallocated) /* and it's allocated */ 385 &&(strcmp(DRIVE[i].label.name, 386 DRIVE[driveno].label.name) == 0)) { /* and it has the same name */ 387 struct drive *mydrive = &DRIVE[i]; 388 389 if (mydrive->devicename[0] == '/') { /* we know a device name for it */ 390 /* 391 * set an error, but don't take the 392 * drive down: that would cause unneeded 393 * error messages. 394 */ 395 drive->lasterror = EEXIST; 396 break; 397 } else { /* it's just a place holder, */ 398 int sdno; 399 400 for (sdno = 0; sdno < vinum_conf.subdisks_allocated; sdno++) { /* look at each subdisk */ 401 if ((SD[sdno].driveno == i) /* it's pointing to this one, */ 402 &&(SD[sdno].state != sd_unallocated)) { /* and it's a real subdisk */ 403 SD[sdno].driveno = drive->driveno; /* point to the one we found */ 404 update_sd_state(sdno); /* and update its state */ 405 } 406 } 407 bzero(mydrive, sizeof(struct drive)); /* don't deallocate it, just remove it */ 408 } 409 } 410 } 411 } else { 412 if (drive->lasterror == 0) 413 drive->lasterror = ENODEV; 414 close_drive(drive); 415 drive->state = drive_down; 416 } 417 return drive; 418 } 419 420 static char * 421 sappend(char *txt, char *s) 422 { 423 while ((*s++ = *txt++) != 0); 424 return s - 1; 425 } 426 427 void 428 format_config(char *config, int len) 429 { 430 int i; 431 int j; 432 char *s = config; 433 char *configend = &config[len]; 434 435 bzero(config, len); 436 437 /* First write the volume configuration */ 438 for (i = 0; i < vinum_conf.volumes_allocated; i++) { 439 struct volume *vol; 440 441 vol = &vinum_conf.volume[i]; 442 if ((vol->state > volume_uninit) 443 && (vol->name[0] != '\0')) { /* paranoia */ 444 ksnprintf(s, 445 configend - s, 446 "volume %s state %s", 447 vol->name, 448 volume_state(vol->state)); 449 while (*s) 450 s++; /* find the end */ 451 if (vol->preferred_plex >= 0) /* preferences, */ 452 ksnprintf(s, 453 configend - s, 454 " readpol prefer %s", 455 vinum_conf.plex[vol->preferred_plex].name); 456 while (*s) 457 s++; /* find the end */ 458 s = sappend("\n", s); 459 } 460 } 461 462 /* Then the plex configuration */ 463 for (i = 0; i < vinum_conf.plexes_allocated; i++) { 464 struct plex *plex; 465 466 plex = &vinum_conf.plex[i]; 467 if ((plex->state > plex_referenced) 468 && (plex->name[0] != '\0')) { /* paranoia */ 469 ksnprintf(s, 470 configend - s, 471 "plex name %s state %s org %s ", 472 plex->name, 473 plex_state(plex->state), 474 plex_org(plex->organization)); 475 while (*s) 476 s++; /* find the end */ 477 if (isstriped(plex)) { 478 ksnprintf(s, 479 configend - s, 480 "%ds ", 481 (int) plex->stripesize); 482 while (*s) 483 s++; /* find the end */ 484 } 485 if (plex->volno >= 0) /* we have a volume */ 486 ksnprintf(s, 487 configend - s, 488 "vol %s ", 489 vinum_conf.volume[plex->volno].name); 490 while (*s) 491 s++; /* find the end */ 492 for (j = 0; j < plex->subdisks; j++) { 493 ksnprintf(s, 494 configend - s, 495 " sd %s", 496 vinum_conf.sd[plex->sdnos[j]].name); 497 } 498 s = sappend("\n", s); 499 } 500 } 501 502 /* And finally the subdisk configuration */ 503 for (i = 0; i < vinum_conf.subdisks_allocated; i++) { 504 struct sd *sd; 505 char *drivename; 506 507 sd = &SD[i]; 508 if ((sd->state != sd_referenced) 509 && (sd->state != sd_unallocated) 510 && (sd->name[0] != '\0')) { /* paranoia */ 511 drivename = vinum_conf.drive[sd->driveno].label.name; 512 /* 513 * XXX We've seen cases of dead subdisks 514 * which don't have a drive. If we let them 515 * through here, the drive name is null, so 516 * they get the drive named 'plex'. 517 * 518 * This is a breakage limiter, not a fix. 519 */ 520 if (drivename[0] == '\0') 521 drivename = "*invalid*"; 522 ksnprintf(s, 523 configend - s, 524 "sd name %s drive %s plex %s len %llus driveoffset %llus state %s", 525 sd->name, 526 drivename, 527 vinum_conf.plex[sd->plexno].name, 528 (unsigned long long) sd->sectors, 529 (unsigned long long) sd->driveoffset, 530 sd_state(sd->state)); 531 while (*s) 532 s++; /* find the end */ 533 if (sd->plexno >= 0) 534 ksnprintf(s, 535 configend - s, 536 " plexoffset %llds", 537 (long long) sd->plexoffset); 538 else 539 ksnprintf(s, configend - s, " detached"); 540 while (*s) 541 s++; /* find the end */ 542 if (sd->flags & VF_RETRYERRORS) { 543 ksnprintf(s, configend - s, " retryerrors"); 544 while (*s) 545 s++; /* find the end */ 546 } 547 ksnprintf(s, configend - s, " \n"); 548 while (*s) 549 s++; /* find the end */ 550 } 551 } 552 if (s > &config[len - 2]) 553 panic("vinum: configuration data overflow"); 554 } 555 556 /* 557 * issue a save config request to the d�mon. The actual work 558 * is done in process context by daemon_save_config 559 */ 560 void 561 save_config(void) 562 { 563 queue_daemon_request(daemonrq_saveconfig, (union daemoninfo) NULL); 564 } 565 566 /* 567 * Write the configuration to all vinum slices. This 568 * is performed by the d�mon only 569 */ 570 void 571 daemon_save_config(void) 572 { 573 int error; 574 int written_config; /* set when we first write the config to disk */ 575 int driveno; 576 struct drive *drive; /* point to current drive info */ 577 struct vinum_hdr *vhdr; /* and as header */ 578 char *config; /* point to config data */ 579 int wlabel_on; /* to set writing label on/off */ 580 581 /* don't save the configuration while we're still working on it */ 582 if (vinum_conf.flags & VF_CONFIGURING) 583 return; 584 written_config = 0; /* no config written yet */ 585 /* Build a volume header */ 586 vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* get space for the config data */ 587 CHECKALLOC(vhdr, "Can't allocate config data"); 588 vhdr->magic = VINUM_MAGIC; /* magic number */ 589 vhdr->config_length = MAXCONFIG; /* length of following config info */ 590 591 config = Malloc(MAXCONFIG); /* get space for the config data */ 592 CHECKALLOC(config, "Can't allocate config data"); 593 594 format_config(config, MAXCONFIG); 595 error = 0; /* no errors yet */ 596 for (driveno = 0; driveno < vinum_conf.drives_allocated; driveno++) { 597 drive = &vinum_conf.drive[driveno]; /* point to drive */ 598 if (drive->state > drive_referenced) { 599 LOCKDRIVE(drive); /* don't let it change */ 600 601 /* 602 * First, do some drive consistency checks. Some 603 * of these are kludges, others require a process 604 * context and couldn't be done before 605 */ 606 if ((drive->devicename[0] == '\0') 607 || (drive->label.name[0] == '\0')) { 608 unlockdrive(drive); 609 free_drive(drive); /* get rid of it */ 610 break; 611 } 612 if (((drive->flags & VF_OPEN) == 0) /* drive not open */ 613 &&(drive->state > drive_down)) { /* and it thinks it's not down */ 614 unlockdrive(drive); 615 set_drive_state(driveno, drive_down, setstate_force); /* tell it what's what */ 616 continue; 617 } 618 if ((drive->state == drive_down) /* it's down */ 619 &&(drive->flags & VF_OPEN)) { /* but open, */ 620 unlockdrive(drive); 621 close_drive(drive); /* close it */ 622 } else if (drive->state > drive_down) { 623 getmicrotime(&drive->label.last_update); /* time of last update is now */ 624 bcopy((char *) &drive->label, /* and the label info from the drive structure */ 625 (char *) &vhdr->label, 626 sizeof(vhdr->label)); 627 if ((drive->state != drive_unallocated) 628 && (drive->state != drive_referenced)) { /* and it's a real drive */ 629 wlabel_on = 1; /* enable writing the label */ 630 error = 0; 631 #if 1 632 error = VOP_IOCTL(drive->vp, DIOCWLABEL, 633 (caddr_t)&wlabel_on, 634 FREAD|FWRITE, proc0.p_ucred); 635 #endif 636 if (error == 0) 637 error = write_drive(drive, (char *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET); 638 if (error == 0) 639 error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET); /* first config copy */ 640 if (error == 0) 641 error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET + MAXCONFIG); /* second copy */ 642 wlabel_on = 0; /* enable writing the label */ 643 #if 1 644 if (error == 0) { 645 error = VOP_IOCTL(drive->vp, DIOCWLABEL, 646 (caddr_t)&wlabel_on, 647 FREAD|FWRITE, proc0.p_ucred); 648 } 649 #endif 650 unlockdrive(drive); 651 if (error) { 652 log(LOG_ERR, 653 "vinum: Can't write config to %s, error %d\n", 654 drive->devicename, 655 error); 656 set_drive_state(drive->driveno, drive_down, setstate_force); 657 } else 658 written_config = 1; /* we've written it on at least one drive */ 659 } 660 } else /* not worth looking at, */ 661 unlockdrive(drive); /* just unlock it again */ 662 } 663 } 664 Free(vhdr); 665 Free(config); 666 } 667 668 /* Look at all disks on the system for vinum slices */ 669 int 670 vinum_scandisk(char *devicename[], int drives) 671 { 672 struct drive *volatile drive; 673 volatile int driveno; 674 int firstdrive; /* first drive in this list */ 675 volatile int gooddrives; /* number of usable drives found */ 676 int firsttime; /* set if we have never configured before */ 677 int error; 678 char *config_text; /* read the config info from disk into here */ 679 char *volatile cptr; /* pointer into config information */ 680 char *eptr; /* end pointer into config information */ 681 char *config_line; /* copy the config line to */ 682 volatile int status; 683 int *volatile drivelist; /* list of drive indices */ 684 #define DRIVENAMELEN 64 685 #define DRIVEPARTS 35 /* max partitions per drive, excluding c */ 686 char partname[DRIVENAMELEN]; /* for creating partition names */ 687 688 status = 0; /* success indication */ 689 vinum_conf.flags |= VF_READING_CONFIG; /* reading config from disk */ 690 691 gooddrives = 0; /* number of usable drives found */ 692 firstdrive = vinum_conf.drives_used; /* the first drive */ 693 firsttime = vinum_conf.drives_used == 0; /* are we a virgin? */ 694 695 /* allocate a drive pointer list */ 696 drivelist = (int *) Malloc(drives * DRIVEPARTS * sizeof(int)); 697 CHECKALLOC(drivelist, "Can't allocate memory"); 698 error = lock_config(); /* make sure we're alone here */ 699 if (error) 700 return error; 701 error = setjmp(command_fail); /* come back here on error */ 702 if (error) { /* longjmped out */ 703 unlock_config(); 704 return error; 705 } 706 707 /* Open all drives and find which was modified most recently */ 708 for (driveno = 0; driveno < drives; driveno++) { 709 char part; /* UNIX partition */ 710 int slice; 711 int founddrive; /* flag when we find a vinum drive */ 712 int has_slice = 0; 713 int has_part = 0; 714 char *tmp; 715 716 founddrive = 0; /* no vinum drive found yet on this spindle */ 717 718 /* 719 * If the device path contains a slice we do not try to tack on 720 * another slice. If the device path has a partition we only check 721 * that partition. 722 */ 723 if ((tmp = rindex(devicename[driveno], '/')) == NULL) 724 tmp = devicename[driveno]; 725 while (*tmp && (*tmp < '0' || *tmp > '9')) 726 ++tmp; 727 while (*tmp && *tmp >= '0' && *tmp <= '9') 728 ++tmp; 729 if (*tmp == 's') 730 has_slice = strtol(tmp + 1, &tmp, 0); 731 if (*tmp >= 'a' && *tmp <= 'p') 732 has_part = *tmp; 733 734 /* 735 * Scan slices if no slice was specified, only if no partition was 736 * specified. 737 */ 738 if (has_slice == 0 && has_part == 0) 739 for (slice = 0; slice < MAX_SLICES; slice++) { 740 if (has_slice && slice != has_slice) 741 continue; 742 743 for (part = 'a'; part < 'a' + MAXPARTITIONS; part++) { 744 if (has_part && part != has_part) 745 continue; 746 if (part == 'c') 747 continue; 748 ksnprintf(partname, DRIVENAMELEN, 749 "%ss%d%c", devicename[driveno], slice, part); 750 drive = check_drive(partname); /* try to open it */ 751 if ((drive->lasterror != 0) /* didn't work, */ 752 ||(drive->state != drive_up)) 753 free_drive(drive); /* get rid of it */ 754 else if (drive->flags & VF_CONFIGURED) /* already read this config, */ 755 log(LOG_WARNING, 756 "vinum: already read config from %s\n", /* say so */ 757 drive->label.name); 758 else { 759 drivelist[gooddrives] = drive->driveno; /* keep the drive index */ 760 drive->flags &= ~VF_NEWBORN; /* which is no longer newly born */ 761 gooddrives++; 762 founddrive++; 763 } 764 } 765 } 766 if (founddrive == 0 && has_slice == 0) { /* didn't find anything, */ 767 for (part = 'a'; part < 'a' + MAXPARTITIONS; part++) { /* try the compatibility partition */ 768 if (has_part && has_part != part) 769 continue; 770 if (part == 'c') 771 continue; 772 if (has_part) { 773 ksnprintf(partname, DRIVENAMELEN, 774 "%s", devicename[driveno]); 775 } else { 776 ksnprintf(partname, DRIVENAMELEN, 777 "%s%c", devicename[driveno], part); 778 } 779 drive = check_drive(partname); /* try to open it */ 780 if ((drive->lasterror != 0) /* didn't work, */ 781 ||(drive->state != drive_up)) 782 free_drive(drive); /* get rid of it */ 783 else if (drive->flags & VF_CONFIGURED) /* already read this config, */ 784 log(LOG_WARNING, 785 "vinum: already read config from %s\n", /* say so */ 786 drive->label.name); 787 else { 788 drivelist[gooddrives] = drive->driveno; /* keep the drive index */ 789 drive->flags &= ~VF_NEWBORN; /* which is no longer newly born */ 790 gooddrives++; 791 } 792 } 793 } 794 } 795 796 if (gooddrives == 0) { 797 if (firsttime) 798 log(LOG_WARNING, "vinum: no drives found\n"); 799 else 800 log(LOG_INFO, "vinum: no additional drives found\n"); 801 unlock_config(); 802 return ENOENT; 803 } 804 /* 805 * We now have at least one drive 806 * open. Sort them in order of config time 807 * and merge the config info with what we 808 * have already. 809 */ 810 kqsort(drivelist, gooddrives, sizeof(int), drivecmp); 811 config_text = (char *) Malloc(MAXCONFIG * 2); /* allocate buffers */ 812 CHECKALLOC(config_text, "Can't allocate memory"); 813 config_line = (char *) Malloc(MAXCONFIGLINE * 2); /* allocate buffers */ 814 CHECKALLOC(config_line, "Can't allocate memory"); 815 for (driveno = 0; driveno < gooddrives; driveno++) { /* now include the config */ 816 drive = &DRIVE[drivelist[driveno]]; /* point to the drive */ 817 818 if (firsttime && (driveno == 0)) /* we've never configured before, */ 819 log(LOG_INFO, "vinum: reading configuration from %s\n", drive->devicename); 820 else 821 log(LOG_INFO, "vinum: updating configuration from %s\n", drive->devicename); 822 823 if (drive->state == drive_up) 824 /* Read in both copies of the configuration information */ 825 error = read_drive(drive, config_text, MAXCONFIG * 2, VINUM_CONFIG_OFFSET); 826 else { 827 error = EIO; 828 kprintf("vinum_scandisk: %s is %s\n", drive->devicename, drive_state(drive->state)); 829 } 830 831 if (error != 0) { 832 log(LOG_ERR, "vinum: Can't read device %s, error %d\n", drive->devicename, error); 833 free_drive(drive); /* give it back */ 834 status = error; 835 } 836 /* 837 * At this point, check that the two copies 838 * are the same, and do something useful if 839 * not. In particular, consider which is 840 * newer, and what this means for the 841 * integrity of the data on the drive. 842 */ 843 else { 844 vinum_conf.drives_used++; /* another drive in use */ 845 /* Parse the configuration, and add it to the global configuration */ 846 for (cptr = config_text; *cptr != '\0';) { /* love this style(9) */ 847 volatile int parse_status; /* return value from parse_config */ 848 849 for (eptr = config_line; (*cptr != '\n') && (*cptr != '\0');) /* until the end of the line */ 850 *eptr++ = *cptr++; 851 *eptr = '\0'; /* and delimit */ 852 if (setjmp(command_fail) == 0) { /* come back here on error and continue */ 853 parse_status = parse_config(config_line, &keyword_set, 1); /* parse the config line */ 854 if (parse_status < 0) { /* error in config */ 855 /* 856 * This config should have been parsed in user 857 * space. If we run into problems here, something 858 * serious is afoot. Complain and let the user 859 * snarf the config to see what's wrong. 860 */ 861 log(LOG_ERR, 862 "vinum: Config error on %s, aborting integration\n", 863 drive->devicename); 864 free_drive(drive); /* give it back */ 865 status = EINVAL; 866 } 867 } 868 while (*cptr == '\n') 869 cptr++; /* skip to next line */ 870 } 871 } 872 drive->flags |= VF_CONFIGURED; /* read this drive's configuration */ 873 } 874 875 Free(config_line); 876 Free(config_text); 877 Free(drivelist); 878 vinum_conf.flags &= ~VF_READING_CONFIG; /* no longer reading from disk */ 879 if (status != 0) 880 kprintf("vinum: couldn't read configuration"); 881 else 882 updateconfig(VF_READING_CONFIG); /* update from disk config */ 883 unlock_config(); 884 return status; 885 } 886 887 /* 888 * Compare the modification dates of the drives, for qsort. 889 * Return 1 if a < b, 0 if a == b, 01 if a > b: in other 890 * words, sort backwards. 891 */ 892 int 893 drivecmp(const void *va, const void *vb) 894 { 895 const struct drive *a = &DRIVE[*(const int *) va]; 896 const struct drive *b = &DRIVE[*(const int *) vb]; 897 898 if ((a->label.last_update.tv_sec == b->label.last_update.tv_sec) 899 && (a->label.last_update.tv_usec == b->label.last_update.tv_usec)) 900 return 0; 901 else if ((a->label.last_update.tv_sec > b->label.last_update.tv_sec) 902 || ((a->label.last_update.tv_sec == b->label.last_update.tv_sec) 903 && (a->label.last_update.tv_usec > b->label.last_update.tv_usec))) 904 return -1; 905 else 906 return 1; 907 } 908 /* Local Variables: */ 909 /* fill-column: 50 */ 910 /* End: */ 911