1 /* 2 md.c : Multiple Devices driver for Linux 3 Copyright (C) 1998, 1999, 2000 Ingo Molnar 4 5 completely rewritten, based on the MD driver code from Marc Zyngier 6 7 Changes: 8 9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar 10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> 11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> 12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su> 13 - kmod support by: Cyrus Durgin 14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> 15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> 16 17 - lots of fixes and improvements to the RAID1/RAID5 and generic 18 RAID code (such as request based resynchronization): 19 20 Neil Brown <neilb@cse.unsw.edu.au>. 21 22 - persistent bitmap code 23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. 24 25 This program is free software; you can redistribute it and/or modify 26 it under the terms of the GNU General Public License as published by 27 the Free Software Foundation; either version 2, or (at your option) 28 any later version. 29 30 You should have received a copy of the GNU General Public License 31 (for example /usr/src/linux/COPYING); if not, write to the Free 32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/config.h> 37 #include <linux/kthread.h> 38 #include <linux/linkage.h> 39 #include <linux/raid/md.h> 40 #include <linux/raid/bitmap.h> 41 #include <linux/sysctl.h> 42 #include <linux/devfs_fs_kernel.h> 43 #include <linux/buffer_head.h> /* for invalidate_bdev */ 44 #include <linux/suspend.h> 45 46 #include <linux/init.h> 47 48 #include <linux/file.h> 49 50 #ifdef CONFIG_KMOD 51 #include <linux/kmod.h> 52 #endif 53 54 #include <asm/unaligned.h> 55 56 #define MAJOR_NR MD_MAJOR 57 #define MD_DRIVER 58 59 /* 63 partitions with the alternate major number (mdp) */ 60 #define MdpMinorShift 6 61 62 #define DEBUG 0 63 #define dprintk(x...) ((void)(DEBUG && printk(x))) 64 65 66 #ifndef MODULE 67 static void autostart_arrays (int part); 68 #endif 69 70 static mdk_personality_t *pers[MAX_PERSONALITY]; 71 static DEFINE_SPINLOCK(pers_lock); 72 73 /* 74 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 75 * is 1000 KB/sec, so the extra system load does not show up that much. 76 * Increase it if you want to have more _guaranteed_ speed. Note that 77 * the RAID driver will use the maximum available bandwidth if the IO 78 * subsystem is idle. There is also an 'absolute maximum' reconstruction 79 * speed limit - in case reconstruction slows down your system despite 80 * idle IO detection. 81 * 82 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 83 */ 84 85 static int sysctl_speed_limit_min = 1000; 86 static int sysctl_speed_limit_max = 200000; 87 88 static struct ctl_table_header *raid_table_header; 89 90 static ctl_table raid_table[] = { 91 { 92 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, 93 .procname = "speed_limit_min", 94 .data = &sysctl_speed_limit_min, 95 .maxlen = sizeof(int), 96 .mode = 0644, 97 .proc_handler = &proc_dointvec, 98 }, 99 { 100 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, 101 .procname = "speed_limit_max", 102 .data = &sysctl_speed_limit_max, 103 .maxlen = sizeof(int), 104 .mode = 0644, 105 .proc_handler = &proc_dointvec, 106 }, 107 { .ctl_name = 0 } 108 }; 109 110 static ctl_table raid_dir_table[] = { 111 { 112 .ctl_name = DEV_RAID, 113 .procname = "raid", 114 .maxlen = 0, 115 .mode = 0555, 116 .child = raid_table, 117 }, 118 { .ctl_name = 0 } 119 }; 120 121 static ctl_table raid_root_table[] = { 122 { 123 .ctl_name = CTL_DEV, 124 .procname = "dev", 125 .maxlen = 0, 126 .mode = 0555, 127 .child = raid_dir_table, 128 }, 129 { .ctl_name = 0 } 130 }; 131 132 static struct block_device_operations md_fops; 133 134 static int start_readonly; 135 136 /* 137 * Enables to iterate over all existing md arrays 138 * all_mddevs_lock protects this list. 139 */ 140 static LIST_HEAD(all_mddevs); 141 static DEFINE_SPINLOCK(all_mddevs_lock); 142 143 144 /* 145 * iterates through all used mddevs in the system. 146 * We take care to grab the all_mddevs_lock whenever navigating 147 * the list, and to always hold a refcount when unlocked. 148 * Any code which breaks out of this loop while own 149 * a reference to the current mddev and must mddev_put it. 150 */ 151 #define ITERATE_MDDEV(mddev,tmp) \ 152 \ 153 for (({ spin_lock(&all_mddevs_lock); \ 154 tmp = all_mddevs.next; \ 155 mddev = NULL;}); \ 156 ({ if (tmp != &all_mddevs) \ 157 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ 158 spin_unlock(&all_mddevs_lock); \ 159 if (mddev) mddev_put(mddev); \ 160 mddev = list_entry(tmp, mddev_t, all_mddevs); \ 161 tmp != &all_mddevs;}); \ 162 ({ spin_lock(&all_mddevs_lock); \ 163 tmp = tmp->next;}) \ 164 ) 165 166 167 static int md_fail_request (request_queue_t *q, struct bio *bio) 168 { 169 bio_io_error(bio, bio->bi_size); 170 return 0; 171 } 172 173 static inline mddev_t *mddev_get(mddev_t *mddev) 174 { 175 atomic_inc(&mddev->active); 176 return mddev; 177 } 178 179 static void mddev_put(mddev_t *mddev) 180 { 181 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 182 return; 183 if (!mddev->raid_disks && list_empty(&mddev->disks)) { 184 list_del(&mddev->all_mddevs); 185 blk_put_queue(mddev->queue); 186 kobject_unregister(&mddev->kobj); 187 } 188 spin_unlock(&all_mddevs_lock); 189 } 190 191 static mddev_t * mddev_find(dev_t unit) 192 { 193 mddev_t *mddev, *new = NULL; 194 195 retry: 196 spin_lock(&all_mddevs_lock); 197 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 198 if (mddev->unit == unit) { 199 mddev_get(mddev); 200 spin_unlock(&all_mddevs_lock); 201 kfree(new); 202 return mddev; 203 } 204 205 if (new) { 206 list_add(&new->all_mddevs, &all_mddevs); 207 spin_unlock(&all_mddevs_lock); 208 return new; 209 } 210 spin_unlock(&all_mddevs_lock); 211 212 new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL); 213 if (!new) 214 return NULL; 215 216 memset(new, 0, sizeof(*new)); 217 218 new->unit = unit; 219 if (MAJOR(unit) == MD_MAJOR) 220 new->md_minor = MINOR(unit); 221 else 222 new->md_minor = MINOR(unit) >> MdpMinorShift; 223 224 init_MUTEX(&new->reconfig_sem); 225 INIT_LIST_HEAD(&new->disks); 226 INIT_LIST_HEAD(&new->all_mddevs); 227 init_timer(&new->safemode_timer); 228 atomic_set(&new->active, 1); 229 spin_lock_init(&new->write_lock); 230 init_waitqueue_head(&new->sb_wait); 231 232 new->queue = blk_alloc_queue(GFP_KERNEL); 233 if (!new->queue) { 234 kfree(new); 235 return NULL; 236 } 237 238 blk_queue_make_request(new->queue, md_fail_request); 239 240 goto retry; 241 } 242 243 static inline int mddev_lock(mddev_t * mddev) 244 { 245 return down_interruptible(&mddev->reconfig_sem); 246 } 247 248 static inline void mddev_lock_uninterruptible(mddev_t * mddev) 249 { 250 down(&mddev->reconfig_sem); 251 } 252 253 static inline int mddev_trylock(mddev_t * mddev) 254 { 255 return down_trylock(&mddev->reconfig_sem); 256 } 257 258 static inline void mddev_unlock(mddev_t * mddev) 259 { 260 up(&mddev->reconfig_sem); 261 262 md_wakeup_thread(mddev->thread); 263 } 264 265 mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) 266 { 267 mdk_rdev_t * rdev; 268 struct list_head *tmp; 269 270 ITERATE_RDEV(mddev,rdev,tmp) { 271 if (rdev->desc_nr == nr) 272 return rdev; 273 } 274 return NULL; 275 } 276 277 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) 278 { 279 struct list_head *tmp; 280 mdk_rdev_t *rdev; 281 282 ITERATE_RDEV(mddev,rdev,tmp) { 283 if (rdev->bdev->bd_dev == dev) 284 return rdev; 285 } 286 return NULL; 287 } 288 289 static inline sector_t calc_dev_sboffset(struct block_device *bdev) 290 { 291 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 292 return MD_NEW_SIZE_BLOCKS(size); 293 } 294 295 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) 296 { 297 sector_t size; 298 299 size = rdev->sb_offset; 300 301 if (chunk_size) 302 size &= ~((sector_t)chunk_size/1024 - 1); 303 return size; 304 } 305 306 static int alloc_disk_sb(mdk_rdev_t * rdev) 307 { 308 if (rdev->sb_page) 309 MD_BUG(); 310 311 rdev->sb_page = alloc_page(GFP_KERNEL); 312 if (!rdev->sb_page) { 313 printk(KERN_ALERT "md: out of memory.\n"); 314 return -EINVAL; 315 } 316 317 return 0; 318 } 319 320 static void free_disk_sb(mdk_rdev_t * rdev) 321 { 322 if (rdev->sb_page) { 323 page_cache_release(rdev->sb_page); 324 rdev->sb_loaded = 0; 325 rdev->sb_page = NULL; 326 rdev->sb_offset = 0; 327 rdev->size = 0; 328 } 329 } 330 331 332 static int super_written(struct bio *bio, unsigned int bytes_done, int error) 333 { 334 mdk_rdev_t *rdev = bio->bi_private; 335 mddev_t *mddev = rdev->mddev; 336 if (bio->bi_size) 337 return 1; 338 339 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) 340 md_error(mddev, rdev); 341 342 if (atomic_dec_and_test(&mddev->pending_writes)) 343 wake_up(&mddev->sb_wait); 344 bio_put(bio); 345 return 0; 346 } 347 348 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) 349 { 350 struct bio *bio2 = bio->bi_private; 351 mdk_rdev_t *rdev = bio2->bi_private; 352 mddev_t *mddev = rdev->mddev; 353 if (bio->bi_size) 354 return 1; 355 356 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && 357 error == -EOPNOTSUPP) { 358 unsigned long flags; 359 /* barriers don't appear to be supported :-( */ 360 set_bit(BarriersNotsupp, &rdev->flags); 361 mddev->barriers_work = 0; 362 spin_lock_irqsave(&mddev->write_lock, flags); 363 bio2->bi_next = mddev->biolist; 364 mddev->biolist = bio2; 365 spin_unlock_irqrestore(&mddev->write_lock, flags); 366 wake_up(&mddev->sb_wait); 367 bio_put(bio); 368 return 0; 369 } 370 bio_put(bio2); 371 bio->bi_private = rdev; 372 return super_written(bio, bytes_done, error); 373 } 374 375 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, 376 sector_t sector, int size, struct page *page) 377 { 378 /* write first size bytes of page to sector of rdev 379 * Increment mddev->pending_writes before returning 380 * and decrement it on completion, waking up sb_wait 381 * if zero is reached. 382 * If an error occurred, call md_error 383 * 384 * As we might need to resubmit the request if BIO_RW_BARRIER 385 * causes ENOTSUPP, we allocate a spare bio... 386 */ 387 struct bio *bio = bio_alloc(GFP_NOIO, 1); 388 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); 389 390 bio->bi_bdev = rdev->bdev; 391 bio->bi_sector = sector; 392 bio_add_page(bio, page, size, 0); 393 bio->bi_private = rdev; 394 bio->bi_end_io = super_written; 395 bio->bi_rw = rw; 396 397 atomic_inc(&mddev->pending_writes); 398 if (!test_bit(BarriersNotsupp, &rdev->flags)) { 399 struct bio *rbio; 400 rw |= (1<<BIO_RW_BARRIER); 401 rbio = bio_clone(bio, GFP_NOIO); 402 rbio->bi_private = bio; 403 rbio->bi_end_io = super_written_barrier; 404 submit_bio(rw, rbio); 405 } else 406 submit_bio(rw, bio); 407 } 408 409 void md_super_wait(mddev_t *mddev) 410 { 411 /* wait for all superblock writes that were scheduled to complete. 412 * if any had to be retried (due to BARRIER problems), retry them 413 */ 414 DEFINE_WAIT(wq); 415 for(;;) { 416 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); 417 if (atomic_read(&mddev->pending_writes)==0) 418 break; 419 while (mddev->biolist) { 420 struct bio *bio; 421 spin_lock_irq(&mddev->write_lock); 422 bio = mddev->biolist; 423 mddev->biolist = bio->bi_next ; 424 bio->bi_next = NULL; 425 spin_unlock_irq(&mddev->write_lock); 426 submit_bio(bio->bi_rw, bio); 427 } 428 schedule(); 429 } 430 finish_wait(&mddev->sb_wait, &wq); 431 } 432 433 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) 434 { 435 if (bio->bi_size) 436 return 1; 437 438 complete((struct completion*)bio->bi_private); 439 return 0; 440 } 441 442 int sync_page_io(struct block_device *bdev, sector_t sector, int size, 443 struct page *page, int rw) 444 { 445 struct bio *bio = bio_alloc(GFP_NOIO, 1); 446 struct completion event; 447 int ret; 448 449 rw |= (1 << BIO_RW_SYNC); 450 451 bio->bi_bdev = bdev; 452 bio->bi_sector = sector; 453 bio_add_page(bio, page, size, 0); 454 init_completion(&event); 455 bio->bi_private = &event; 456 bio->bi_end_io = bi_complete; 457 submit_bio(rw, bio); 458 wait_for_completion(&event); 459 460 ret = test_bit(BIO_UPTODATE, &bio->bi_flags); 461 bio_put(bio); 462 return ret; 463 } 464 465 static int read_disk_sb(mdk_rdev_t * rdev, int size) 466 { 467 char b[BDEVNAME_SIZE]; 468 if (!rdev->sb_page) { 469 MD_BUG(); 470 return -EINVAL; 471 } 472 if (rdev->sb_loaded) 473 return 0; 474 475 476 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) 477 goto fail; 478 rdev->sb_loaded = 1; 479 return 0; 480 481 fail: 482 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", 483 bdevname(rdev->bdev,b)); 484 return -EINVAL; 485 } 486 487 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 488 { 489 if ( (sb1->set_uuid0 == sb2->set_uuid0) && 490 (sb1->set_uuid1 == sb2->set_uuid1) && 491 (sb1->set_uuid2 == sb2->set_uuid2) && 492 (sb1->set_uuid3 == sb2->set_uuid3)) 493 494 return 1; 495 496 return 0; 497 } 498 499 500 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 501 { 502 int ret; 503 mdp_super_t *tmp1, *tmp2; 504 505 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 506 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 507 508 if (!tmp1 || !tmp2) { 509 ret = 0; 510 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); 511 goto abort; 512 } 513 514 *tmp1 = *sb1; 515 *tmp2 = *sb2; 516 517 /* 518 * nr_disks is not constant 519 */ 520 tmp1->nr_disks = 0; 521 tmp2->nr_disks = 0; 522 523 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) 524 ret = 0; 525 else 526 ret = 1; 527 528 abort: 529 kfree(tmp1); 530 kfree(tmp2); 531 return ret; 532 } 533 534 static unsigned int calc_sb_csum(mdp_super_t * sb) 535 { 536 unsigned int disk_csum, csum; 537 538 disk_csum = sb->sb_csum; 539 sb->sb_csum = 0; 540 csum = csum_partial((void *)sb, MD_SB_BYTES, 0); 541 sb->sb_csum = disk_csum; 542 return csum; 543 } 544 545 546 /* 547 * Handle superblock details. 548 * We want to be able to handle multiple superblock formats 549 * so we have a common interface to them all, and an array of 550 * different handlers. 551 * We rely on user-space to write the initial superblock, and support 552 * reading and updating of superblocks. 553 * Interface methods are: 554 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) 555 * loads and validates a superblock on dev. 556 * if refdev != NULL, compare superblocks on both devices 557 * Return: 558 * 0 - dev has a superblock that is compatible with refdev 559 * 1 - dev has a superblock that is compatible and newer than refdev 560 * so dev should be used as the refdev in future 561 * -EINVAL superblock incompatible or invalid 562 * -othererror e.g. -EIO 563 * 564 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) 565 * Verify that dev is acceptable into mddev. 566 * The first time, mddev->raid_disks will be 0, and data from 567 * dev should be merged in. Subsequent calls check that dev 568 * is new enough. Return 0 or -EINVAL 569 * 570 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) 571 * Update the superblock for rdev with data in mddev 572 * This does not write to disc. 573 * 574 */ 575 576 struct super_type { 577 char *name; 578 struct module *owner; 579 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); 580 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); 581 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); 582 }; 583 584 /* 585 * load_super for 0.90.0 586 */ 587 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 588 { 589 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 590 mdp_super_t *sb; 591 int ret; 592 sector_t sb_offset; 593 594 /* 595 * Calculate the position of the superblock, 596 * it's at the end of the disk. 597 * 598 * It also happens to be a multiple of 4Kb. 599 */ 600 sb_offset = calc_dev_sboffset(rdev->bdev); 601 rdev->sb_offset = sb_offset; 602 603 ret = read_disk_sb(rdev, MD_SB_BYTES); 604 if (ret) return ret; 605 606 ret = -EINVAL; 607 608 bdevname(rdev->bdev, b); 609 sb = (mdp_super_t*)page_address(rdev->sb_page); 610 611 if (sb->md_magic != MD_SB_MAGIC) { 612 printk(KERN_ERR "md: invalid raid superblock magic on %s\n", 613 b); 614 goto abort; 615 } 616 617 if (sb->major_version != 0 || 618 sb->minor_version != 90) { 619 printk(KERN_WARNING "Bad version number %d.%d on %s\n", 620 sb->major_version, sb->minor_version, 621 b); 622 goto abort; 623 } 624 625 if (sb->raid_disks <= 0) 626 goto abort; 627 628 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { 629 printk(KERN_WARNING "md: invalid superblock checksum on %s\n", 630 b); 631 goto abort; 632 } 633 634 rdev->preferred_minor = sb->md_minor; 635 rdev->data_offset = 0; 636 rdev->sb_size = MD_SB_BYTES; 637 638 if (sb->level == LEVEL_MULTIPATH) 639 rdev->desc_nr = -1; 640 else 641 rdev->desc_nr = sb->this_disk.number; 642 643 if (refdev == 0) 644 ret = 1; 645 else { 646 __u64 ev1, ev2; 647 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); 648 if (!uuid_equal(refsb, sb)) { 649 printk(KERN_WARNING "md: %s has different UUID to %s\n", 650 b, bdevname(refdev->bdev,b2)); 651 goto abort; 652 } 653 if (!sb_equal(refsb, sb)) { 654 printk(KERN_WARNING "md: %s has same UUID" 655 " but different superblock to %s\n", 656 b, bdevname(refdev->bdev, b2)); 657 goto abort; 658 } 659 ev1 = md_event(sb); 660 ev2 = md_event(refsb); 661 if (ev1 > ev2) 662 ret = 1; 663 else 664 ret = 0; 665 } 666 rdev->size = calc_dev_size(rdev, sb->chunk_size); 667 668 abort: 669 return ret; 670 } 671 672 /* 673 * validate_super for 0.90.0 674 */ 675 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) 676 { 677 mdp_disk_t *desc; 678 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); 679 680 rdev->raid_disk = -1; 681 rdev->flags = 0; 682 if (mddev->raid_disks == 0) { 683 mddev->major_version = 0; 684 mddev->minor_version = sb->minor_version; 685 mddev->patch_version = sb->patch_version; 686 mddev->persistent = ! sb->not_persistent; 687 mddev->chunk_size = sb->chunk_size; 688 mddev->ctime = sb->ctime; 689 mddev->utime = sb->utime; 690 mddev->level = sb->level; 691 mddev->layout = sb->layout; 692 mddev->raid_disks = sb->raid_disks; 693 mddev->size = sb->size; 694 mddev->events = md_event(sb); 695 mddev->bitmap_offset = 0; 696 mddev->default_bitmap_offset = MD_SB_BYTES >> 9; 697 698 if (sb->state & (1<<MD_SB_CLEAN)) 699 mddev->recovery_cp = MaxSector; 700 else { 701 if (sb->events_hi == sb->cp_events_hi && 702 sb->events_lo == sb->cp_events_lo) { 703 mddev->recovery_cp = sb->recovery_cp; 704 } else 705 mddev->recovery_cp = 0; 706 } 707 708 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 709 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 710 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 711 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 712 713 mddev->max_disks = MD_SB_DISKS; 714 715 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 716 mddev->bitmap_file == NULL) { 717 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) { 718 /* FIXME use a better test */ 719 printk(KERN_WARNING "md: bitmaps only support for raid1\n"); 720 return -EINVAL; 721 } 722 mddev->bitmap_offset = mddev->default_bitmap_offset; 723 } 724 725 } else if (mddev->pers == NULL) { 726 /* Insist on good event counter while assembling */ 727 __u64 ev1 = md_event(sb); 728 ++ev1; 729 if (ev1 < mddev->events) 730 return -EINVAL; 731 } else if (mddev->bitmap) { 732 /* if adding to array with a bitmap, then we can accept an 733 * older device ... but not too old. 734 */ 735 __u64 ev1 = md_event(sb); 736 if (ev1 < mddev->bitmap->events_cleared) 737 return 0; 738 } else /* just a hot-add of a new device, leave raid_disk at -1 */ 739 return 0; 740 741 if (mddev->level != LEVEL_MULTIPATH) { 742 desc = sb->disks + rdev->desc_nr; 743 744 if (desc->state & (1<<MD_DISK_FAULTY)) 745 set_bit(Faulty, &rdev->flags); 746 else if (desc->state & (1<<MD_DISK_SYNC) && 747 desc->raid_disk < mddev->raid_disks) { 748 set_bit(In_sync, &rdev->flags); 749 rdev->raid_disk = desc->raid_disk; 750 } 751 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 752 set_bit(WriteMostly, &rdev->flags); 753 } else /* MULTIPATH are always insync */ 754 set_bit(In_sync, &rdev->flags); 755 return 0; 756 } 757 758 /* 759 * sync_super for 0.90.0 760 */ 761 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) 762 { 763 mdp_super_t *sb; 764 struct list_head *tmp; 765 mdk_rdev_t *rdev2; 766 int next_spare = mddev->raid_disks; 767 768 769 /* make rdev->sb match mddev data.. 770 * 771 * 1/ zero out disks 772 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 773 * 3/ any empty disks < next_spare become removed 774 * 775 * disks[0] gets initialised to REMOVED because 776 * we cannot be sure from other fields if it has 777 * been initialised or not. 778 */ 779 int i; 780 int active=0, working=0,failed=0,spare=0,nr_disks=0; 781 782 rdev->sb_size = MD_SB_BYTES; 783 784 sb = (mdp_super_t*)page_address(rdev->sb_page); 785 786 memset(sb, 0, sizeof(*sb)); 787 788 sb->md_magic = MD_SB_MAGIC; 789 sb->major_version = mddev->major_version; 790 sb->minor_version = mddev->minor_version; 791 sb->patch_version = mddev->patch_version; 792 sb->gvalid_words = 0; /* ignored */ 793 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 794 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 795 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 796 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 797 798 sb->ctime = mddev->ctime; 799 sb->level = mddev->level; 800 sb->size = mddev->size; 801 sb->raid_disks = mddev->raid_disks; 802 sb->md_minor = mddev->md_minor; 803 sb->not_persistent = !mddev->persistent; 804 sb->utime = mddev->utime; 805 sb->state = 0; 806 sb->events_hi = (mddev->events>>32); 807 sb->events_lo = (u32)mddev->events; 808 809 if (mddev->in_sync) 810 { 811 sb->recovery_cp = mddev->recovery_cp; 812 sb->cp_events_hi = (mddev->events>>32); 813 sb->cp_events_lo = (u32)mddev->events; 814 if (mddev->recovery_cp == MaxSector) 815 sb->state = (1<< MD_SB_CLEAN); 816 } else 817 sb->recovery_cp = 0; 818 819 sb->layout = mddev->layout; 820 sb->chunk_size = mddev->chunk_size; 821 822 if (mddev->bitmap && mddev->bitmap_file == NULL) 823 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 824 825 sb->disks[0].state = (1<<MD_DISK_REMOVED); 826 ITERATE_RDEV(mddev,rdev2,tmp) { 827 mdp_disk_t *d; 828 int desc_nr; 829 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) 830 && !test_bit(Faulty, &rdev2->flags)) 831 desc_nr = rdev2->raid_disk; 832 else 833 desc_nr = next_spare++; 834 rdev2->desc_nr = desc_nr; 835 d = &sb->disks[rdev2->desc_nr]; 836 nr_disks++; 837 d->number = rdev2->desc_nr; 838 d->major = MAJOR(rdev2->bdev->bd_dev); 839 d->minor = MINOR(rdev2->bdev->bd_dev); 840 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) 841 && !test_bit(Faulty, &rdev2->flags)) 842 d->raid_disk = rdev2->raid_disk; 843 else 844 d->raid_disk = rdev2->desc_nr; /* compatibility */ 845 if (test_bit(Faulty, &rdev2->flags)) { 846 d->state = (1<<MD_DISK_FAULTY); 847 failed++; 848 } else if (test_bit(In_sync, &rdev2->flags)) { 849 d->state = (1<<MD_DISK_ACTIVE); 850 d->state |= (1<<MD_DISK_SYNC); 851 active++; 852 working++; 853 } else { 854 d->state = 0; 855 spare++; 856 working++; 857 } 858 if (test_bit(WriteMostly, &rdev2->flags)) 859 d->state |= (1<<MD_DISK_WRITEMOSTLY); 860 } 861 /* now set the "removed" and "faulty" bits on any missing devices */ 862 for (i=0 ; i < mddev->raid_disks ; i++) { 863 mdp_disk_t *d = &sb->disks[i]; 864 if (d->state == 0 && d->number == 0) { 865 d->number = i; 866 d->raid_disk = i; 867 d->state = (1<<MD_DISK_REMOVED); 868 d->state |= (1<<MD_DISK_FAULTY); 869 failed++; 870 } 871 } 872 sb->nr_disks = nr_disks; 873 sb->active_disks = active; 874 sb->working_disks = working; 875 sb->failed_disks = failed; 876 sb->spare_disks = spare; 877 878 sb->this_disk = sb->disks[rdev->desc_nr]; 879 sb->sb_csum = calc_sb_csum(sb); 880 } 881 882 /* 883 * version 1 superblock 884 */ 885 886 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) 887 { 888 unsigned int disk_csum, csum; 889 unsigned long long newcsum; 890 int size = 256 + le32_to_cpu(sb->max_dev)*2; 891 unsigned int *isuper = (unsigned int*)sb; 892 int i; 893 894 disk_csum = sb->sb_csum; 895 sb->sb_csum = 0; 896 newcsum = 0; 897 for (i=0; size>=4; size -= 4 ) 898 newcsum += le32_to_cpu(*isuper++); 899 900 if (size == 2) 901 newcsum += le16_to_cpu(*(unsigned short*) isuper); 902 903 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 904 sb->sb_csum = disk_csum; 905 return cpu_to_le32(csum); 906 } 907 908 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 909 { 910 struct mdp_superblock_1 *sb; 911 int ret; 912 sector_t sb_offset; 913 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 914 int bmask; 915 916 /* 917 * Calculate the position of the superblock. 918 * It is always aligned to a 4K boundary and 919 * depeding on minor_version, it can be: 920 * 0: At least 8K, but less than 12K, from end of device 921 * 1: At start of device 922 * 2: 4K from start of device. 923 */ 924 switch(minor_version) { 925 case 0: 926 sb_offset = rdev->bdev->bd_inode->i_size >> 9; 927 sb_offset -= 8*2; 928 sb_offset &= ~(sector_t)(4*2-1); 929 /* convert from sectors to K */ 930 sb_offset /= 2; 931 break; 932 case 1: 933 sb_offset = 0; 934 break; 935 case 2: 936 sb_offset = 4; 937 break; 938 default: 939 return -EINVAL; 940 } 941 rdev->sb_offset = sb_offset; 942 943 /* superblock is rarely larger than 1K, but it can be larger, 944 * and it is safe to read 4k, so we do that 945 */ 946 ret = read_disk_sb(rdev, 4096); 947 if (ret) return ret; 948 949 950 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 951 952 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 953 sb->major_version != cpu_to_le32(1) || 954 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 955 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || 956 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 957 return -EINVAL; 958 959 if (calc_sb_1_csum(sb) != sb->sb_csum) { 960 printk("md: invalid superblock checksum on %s\n", 961 bdevname(rdev->bdev,b)); 962 return -EINVAL; 963 } 964 if (le64_to_cpu(sb->data_size) < 10) { 965 printk("md: data_size too small on %s\n", 966 bdevname(rdev->bdev,b)); 967 return -EINVAL; 968 } 969 rdev->preferred_minor = 0xffff; 970 rdev->data_offset = le64_to_cpu(sb->data_offset); 971 972 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 973 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; 974 if (rdev->sb_size & bmask) 975 rdev-> sb_size = (rdev->sb_size | bmask)+1; 976 977 if (refdev == 0) 978 return 1; 979 else { 980 __u64 ev1, ev2; 981 struct mdp_superblock_1 *refsb = 982 (struct mdp_superblock_1*)page_address(refdev->sb_page); 983 984 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 985 sb->level != refsb->level || 986 sb->layout != refsb->layout || 987 sb->chunksize != refsb->chunksize) { 988 printk(KERN_WARNING "md: %s has strangely different" 989 " superblock to %s\n", 990 bdevname(rdev->bdev,b), 991 bdevname(refdev->bdev,b2)); 992 return -EINVAL; 993 } 994 ev1 = le64_to_cpu(sb->events); 995 ev2 = le64_to_cpu(refsb->events); 996 997 if (ev1 > ev2) 998 return 1; 999 } 1000 if (minor_version) 1001 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; 1002 else 1003 rdev->size = rdev->sb_offset; 1004 if (rdev->size < le64_to_cpu(sb->data_size)/2) 1005 return -EINVAL; 1006 rdev->size = le64_to_cpu(sb->data_size)/2; 1007 if (le32_to_cpu(sb->chunksize)) 1008 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); 1009 return 0; 1010 } 1011 1012 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) 1013 { 1014 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1015 1016 rdev->raid_disk = -1; 1017 rdev->flags = 0; 1018 if (mddev->raid_disks == 0) { 1019 mddev->major_version = 1; 1020 mddev->patch_version = 0; 1021 mddev->persistent = 1; 1022 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; 1023 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); 1024 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); 1025 mddev->level = le32_to_cpu(sb->level); 1026 mddev->layout = le32_to_cpu(sb->layout); 1027 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1028 mddev->size = le64_to_cpu(sb->size)/2; 1029 mddev->events = le64_to_cpu(sb->events); 1030 mddev->bitmap_offset = 0; 1031 mddev->default_bitmap_offset = 0; 1032 mddev->default_bitmap_offset = 1024; 1033 1034 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1035 memcpy(mddev->uuid, sb->set_uuid, 16); 1036 1037 mddev->max_disks = (4096-256)/2; 1038 1039 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1040 mddev->bitmap_file == NULL ) { 1041 if (mddev->level != 1) { 1042 printk(KERN_WARNING "md: bitmaps only supported for raid1\n"); 1043 return -EINVAL; 1044 } 1045 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); 1046 } 1047 } else if (mddev->pers == NULL) { 1048 /* Insist of good event counter while assembling */ 1049 __u64 ev1 = le64_to_cpu(sb->events); 1050 ++ev1; 1051 if (ev1 < mddev->events) 1052 return -EINVAL; 1053 } else if (mddev->bitmap) { 1054 /* If adding to array with a bitmap, then we can accept an 1055 * older device, but not too old. 1056 */ 1057 __u64 ev1 = le64_to_cpu(sb->events); 1058 if (ev1 < mddev->bitmap->events_cleared) 1059 return 0; 1060 } else /* just a hot-add of a new device, leave raid_disk at -1 */ 1061 return 0; 1062 1063 if (mddev->level != LEVEL_MULTIPATH) { 1064 int role; 1065 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1066 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1067 switch(role) { 1068 case 0xffff: /* spare */ 1069 break; 1070 case 0xfffe: /* faulty */ 1071 set_bit(Faulty, &rdev->flags); 1072 break; 1073 default: 1074 set_bit(In_sync, &rdev->flags); 1075 rdev->raid_disk = role; 1076 break; 1077 } 1078 if (sb->devflags & WriteMostly1) 1079 set_bit(WriteMostly, &rdev->flags); 1080 } else /* MULTIPATH are always insync */ 1081 set_bit(In_sync, &rdev->flags); 1082 1083 return 0; 1084 } 1085 1086 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) 1087 { 1088 struct mdp_superblock_1 *sb; 1089 struct list_head *tmp; 1090 mdk_rdev_t *rdev2; 1091 int max_dev, i; 1092 /* make rdev->sb match mddev and rdev data. */ 1093 1094 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1095 1096 sb->feature_map = 0; 1097 sb->pad0 = 0; 1098 memset(sb->pad1, 0, sizeof(sb->pad1)); 1099 memset(sb->pad2, 0, sizeof(sb->pad2)); 1100 memset(sb->pad3, 0, sizeof(sb->pad3)); 1101 1102 sb->utime = cpu_to_le64((__u64)mddev->utime); 1103 sb->events = cpu_to_le64(mddev->events); 1104 if (mddev->in_sync) 1105 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1106 else 1107 sb->resync_offset = cpu_to_le64(0); 1108 1109 if (mddev->bitmap && mddev->bitmap_file == NULL) { 1110 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); 1111 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1112 } 1113 1114 max_dev = 0; 1115 ITERATE_RDEV(mddev,rdev2,tmp) 1116 if (rdev2->desc_nr+1 > max_dev) 1117 max_dev = rdev2->desc_nr+1; 1118 1119 sb->max_dev = cpu_to_le32(max_dev); 1120 for (i=0; i<max_dev;i++) 1121 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1122 1123 ITERATE_RDEV(mddev,rdev2,tmp) { 1124 i = rdev2->desc_nr; 1125 if (test_bit(Faulty, &rdev2->flags)) 1126 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1127 else if (test_bit(In_sync, &rdev2->flags)) 1128 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1129 else 1130 sb->dev_roles[i] = cpu_to_le16(0xffff); 1131 } 1132 1133 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ 1134 sb->sb_csum = calc_sb_1_csum(sb); 1135 } 1136 1137 1138 static struct super_type super_types[] = { 1139 [0] = { 1140 .name = "0.90.0", 1141 .owner = THIS_MODULE, 1142 .load_super = super_90_load, 1143 .validate_super = super_90_validate, 1144 .sync_super = super_90_sync, 1145 }, 1146 [1] = { 1147 .name = "md-1", 1148 .owner = THIS_MODULE, 1149 .load_super = super_1_load, 1150 .validate_super = super_1_validate, 1151 .sync_super = super_1_sync, 1152 }, 1153 }; 1154 1155 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) 1156 { 1157 struct list_head *tmp; 1158 mdk_rdev_t *rdev; 1159 1160 ITERATE_RDEV(mddev,rdev,tmp) 1161 if (rdev->bdev->bd_contains == dev->bdev->bd_contains) 1162 return rdev; 1163 1164 return NULL; 1165 } 1166 1167 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) 1168 { 1169 struct list_head *tmp; 1170 mdk_rdev_t *rdev; 1171 1172 ITERATE_RDEV(mddev1,rdev,tmp) 1173 if (match_dev_unit(mddev2, rdev)) 1174 return 1; 1175 1176 return 0; 1177 } 1178 1179 static LIST_HEAD(pending_raid_disks); 1180 1181 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) 1182 { 1183 mdk_rdev_t *same_pdev; 1184 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1185 struct kobject *ko; 1186 1187 if (rdev->mddev) { 1188 MD_BUG(); 1189 return -EINVAL; 1190 } 1191 same_pdev = match_dev_unit(mddev, rdev); 1192 if (same_pdev) 1193 printk(KERN_WARNING 1194 "%s: WARNING: %s appears to be on the same physical" 1195 " disk as %s. True\n protection against single-disk" 1196 " failure might be compromised.\n", 1197 mdname(mddev), bdevname(rdev->bdev,b), 1198 bdevname(same_pdev->bdev,b2)); 1199 1200 /* Verify rdev->desc_nr is unique. 1201 * If it is -1, assign a free number, else 1202 * check number is not in use 1203 */ 1204 if (rdev->desc_nr < 0) { 1205 int choice = 0; 1206 if (mddev->pers) choice = mddev->raid_disks; 1207 while (find_rdev_nr(mddev, choice)) 1208 choice++; 1209 rdev->desc_nr = choice; 1210 } else { 1211 if (find_rdev_nr(mddev, rdev->desc_nr)) 1212 return -EBUSY; 1213 } 1214 bdevname(rdev->bdev,b); 1215 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) 1216 return -ENOMEM; 1217 1218 list_add(&rdev->same_set, &mddev->disks); 1219 rdev->mddev = mddev; 1220 printk(KERN_INFO "md: bind<%s>\n", b); 1221 1222 rdev->kobj.parent = &mddev->kobj; 1223 kobject_add(&rdev->kobj); 1224 1225 if (rdev->bdev->bd_part) 1226 ko = &rdev->bdev->bd_part->kobj; 1227 else 1228 ko = &rdev->bdev->bd_disk->kobj; 1229 sysfs_create_link(&rdev->kobj, ko, "block"); 1230 return 0; 1231 } 1232 1233 static void unbind_rdev_from_array(mdk_rdev_t * rdev) 1234 { 1235 char b[BDEVNAME_SIZE]; 1236 if (!rdev->mddev) { 1237 MD_BUG(); 1238 return; 1239 } 1240 list_del_init(&rdev->same_set); 1241 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); 1242 rdev->mddev = NULL; 1243 sysfs_remove_link(&rdev->kobj, "block"); 1244 kobject_del(&rdev->kobj); 1245 } 1246 1247 /* 1248 * prevent the device from being mounted, repartitioned or 1249 * otherwise reused by a RAID array (or any other kernel 1250 * subsystem), by bd_claiming the device. 1251 */ 1252 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) 1253 { 1254 int err = 0; 1255 struct block_device *bdev; 1256 char b[BDEVNAME_SIZE]; 1257 1258 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 1259 if (IS_ERR(bdev)) { 1260 printk(KERN_ERR "md: could not open %s.\n", 1261 __bdevname(dev, b)); 1262 return PTR_ERR(bdev); 1263 } 1264 err = bd_claim(bdev, rdev); 1265 if (err) { 1266 printk(KERN_ERR "md: could not bd_claim %s.\n", 1267 bdevname(bdev, b)); 1268 blkdev_put(bdev); 1269 return err; 1270 } 1271 rdev->bdev = bdev; 1272 return err; 1273 } 1274 1275 static void unlock_rdev(mdk_rdev_t *rdev) 1276 { 1277 struct block_device *bdev = rdev->bdev; 1278 rdev->bdev = NULL; 1279 if (!bdev) 1280 MD_BUG(); 1281 bd_release(bdev); 1282 blkdev_put(bdev); 1283 } 1284 1285 void md_autodetect_dev(dev_t dev); 1286 1287 static void export_rdev(mdk_rdev_t * rdev) 1288 { 1289 char b[BDEVNAME_SIZE]; 1290 printk(KERN_INFO "md: export_rdev(%s)\n", 1291 bdevname(rdev->bdev,b)); 1292 if (rdev->mddev) 1293 MD_BUG(); 1294 free_disk_sb(rdev); 1295 list_del_init(&rdev->same_set); 1296 #ifndef MODULE 1297 md_autodetect_dev(rdev->bdev->bd_dev); 1298 #endif 1299 unlock_rdev(rdev); 1300 kobject_put(&rdev->kobj); 1301 } 1302 1303 static void kick_rdev_from_array(mdk_rdev_t * rdev) 1304 { 1305 unbind_rdev_from_array(rdev); 1306 export_rdev(rdev); 1307 } 1308 1309 static void export_array(mddev_t *mddev) 1310 { 1311 struct list_head *tmp; 1312 mdk_rdev_t *rdev; 1313 1314 ITERATE_RDEV(mddev,rdev,tmp) { 1315 if (!rdev->mddev) { 1316 MD_BUG(); 1317 continue; 1318 } 1319 kick_rdev_from_array(rdev); 1320 } 1321 if (!list_empty(&mddev->disks)) 1322 MD_BUG(); 1323 mddev->raid_disks = 0; 1324 mddev->major_version = 0; 1325 } 1326 1327 static void print_desc(mdp_disk_t *desc) 1328 { 1329 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, 1330 desc->major,desc->minor,desc->raid_disk,desc->state); 1331 } 1332 1333 static void print_sb(mdp_super_t *sb) 1334 { 1335 int i; 1336 1337 printk(KERN_INFO 1338 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", 1339 sb->major_version, sb->minor_version, sb->patch_version, 1340 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, 1341 sb->ctime); 1342 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", 1343 sb->level, sb->size, sb->nr_disks, sb->raid_disks, 1344 sb->md_minor, sb->layout, sb->chunk_size); 1345 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" 1346 " FD:%d SD:%d CSUM:%08x E:%08lx\n", 1347 sb->utime, sb->state, sb->active_disks, sb->working_disks, 1348 sb->failed_disks, sb->spare_disks, 1349 sb->sb_csum, (unsigned long)sb->events_lo); 1350 1351 printk(KERN_INFO); 1352 for (i = 0; i < MD_SB_DISKS; i++) { 1353 mdp_disk_t *desc; 1354 1355 desc = sb->disks + i; 1356 if (desc->number || desc->major || desc->minor || 1357 desc->raid_disk || (desc->state && (desc->state != 4))) { 1358 printk(" D %2d: ", i); 1359 print_desc(desc); 1360 } 1361 } 1362 printk(KERN_INFO "md: THIS: "); 1363 print_desc(&sb->this_disk); 1364 1365 } 1366 1367 static void print_rdev(mdk_rdev_t *rdev) 1368 { 1369 char b[BDEVNAME_SIZE]; 1370 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", 1371 bdevname(rdev->bdev,b), (unsigned long long)rdev->size, 1372 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), 1373 rdev->desc_nr); 1374 if (rdev->sb_loaded) { 1375 printk(KERN_INFO "md: rdev superblock:\n"); 1376 print_sb((mdp_super_t*)page_address(rdev->sb_page)); 1377 } else 1378 printk(KERN_INFO "md: no rdev superblock!\n"); 1379 } 1380 1381 void md_print_devices(void) 1382 { 1383 struct list_head *tmp, *tmp2; 1384 mdk_rdev_t *rdev; 1385 mddev_t *mddev; 1386 char b[BDEVNAME_SIZE]; 1387 1388 printk("\n"); 1389 printk("md: **********************************\n"); 1390 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); 1391 printk("md: **********************************\n"); 1392 ITERATE_MDDEV(mddev,tmp) { 1393 1394 if (mddev->bitmap) 1395 bitmap_print_sb(mddev->bitmap); 1396 else 1397 printk("%s: ", mdname(mddev)); 1398 ITERATE_RDEV(mddev,rdev,tmp2) 1399 printk("<%s>", bdevname(rdev->bdev,b)); 1400 printk("\n"); 1401 1402 ITERATE_RDEV(mddev,rdev,tmp2) 1403 print_rdev(rdev); 1404 } 1405 printk("md: **********************************\n"); 1406 printk("\n"); 1407 } 1408 1409 1410 static void sync_sbs(mddev_t * mddev) 1411 { 1412 mdk_rdev_t *rdev; 1413 struct list_head *tmp; 1414 1415 ITERATE_RDEV(mddev,rdev,tmp) { 1416 super_types[mddev->major_version]. 1417 sync_super(mddev, rdev); 1418 rdev->sb_loaded = 1; 1419 } 1420 } 1421 1422 static void md_update_sb(mddev_t * mddev) 1423 { 1424 int err; 1425 struct list_head *tmp; 1426 mdk_rdev_t *rdev; 1427 int sync_req; 1428 1429 repeat: 1430 spin_lock_irq(&mddev->write_lock); 1431 sync_req = mddev->in_sync; 1432 mddev->utime = get_seconds(); 1433 mddev->events ++; 1434 1435 if (!mddev->events) { 1436 /* 1437 * oops, this 64-bit counter should never wrap. 1438 * Either we are in around ~1 trillion A.C., assuming 1439 * 1 reboot per second, or we have a bug: 1440 */ 1441 MD_BUG(); 1442 mddev->events --; 1443 } 1444 mddev->sb_dirty = 2; 1445 sync_sbs(mddev); 1446 1447 /* 1448 * do not write anything to disk if using 1449 * nonpersistent superblocks 1450 */ 1451 if (!mddev->persistent) { 1452 mddev->sb_dirty = 0; 1453 spin_unlock_irq(&mddev->write_lock); 1454 wake_up(&mddev->sb_wait); 1455 return; 1456 } 1457 spin_unlock_irq(&mddev->write_lock); 1458 1459 dprintk(KERN_INFO 1460 "md: updating %s RAID superblock on device (in sync %d)\n", 1461 mdname(mddev),mddev->in_sync); 1462 1463 err = bitmap_update_sb(mddev->bitmap); 1464 ITERATE_RDEV(mddev,rdev,tmp) { 1465 char b[BDEVNAME_SIZE]; 1466 dprintk(KERN_INFO "md: "); 1467 if (test_bit(Faulty, &rdev->flags)) 1468 dprintk("(skipping faulty "); 1469 1470 dprintk("%s ", bdevname(rdev->bdev,b)); 1471 if (!test_bit(Faulty, &rdev->flags)) { 1472 md_super_write(mddev,rdev, 1473 rdev->sb_offset<<1, rdev->sb_size, 1474 rdev->sb_page); 1475 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", 1476 bdevname(rdev->bdev,b), 1477 (unsigned long long)rdev->sb_offset); 1478 1479 } else 1480 dprintk(")\n"); 1481 if (mddev->level == LEVEL_MULTIPATH) 1482 /* only need to write one superblock... */ 1483 break; 1484 } 1485 md_super_wait(mddev); 1486 /* if there was a failure, sb_dirty was set to 1, and we re-write super */ 1487 1488 spin_lock_irq(&mddev->write_lock); 1489 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { 1490 /* have to write it out again */ 1491 spin_unlock_irq(&mddev->write_lock); 1492 goto repeat; 1493 } 1494 mddev->sb_dirty = 0; 1495 spin_unlock_irq(&mddev->write_lock); 1496 wake_up(&mddev->sb_wait); 1497 1498 } 1499 1500 struct rdev_sysfs_entry { 1501 struct attribute attr; 1502 ssize_t (*show)(mdk_rdev_t *, char *); 1503 ssize_t (*store)(mdk_rdev_t *, const char *, size_t); 1504 }; 1505 1506 static ssize_t 1507 state_show(mdk_rdev_t *rdev, char *page) 1508 { 1509 char *sep = ""; 1510 int len=0; 1511 1512 if (test_bit(Faulty, &rdev->flags)) { 1513 len+= sprintf(page+len, "%sfaulty",sep); 1514 sep = ","; 1515 } 1516 if (test_bit(In_sync, &rdev->flags)) { 1517 len += sprintf(page+len, "%sin_sync",sep); 1518 sep = ","; 1519 } 1520 if (!test_bit(Faulty, &rdev->flags) && 1521 !test_bit(In_sync, &rdev->flags)) { 1522 len += sprintf(page+len, "%sspare", sep); 1523 sep = ","; 1524 } 1525 return len+sprintf(page+len, "\n"); 1526 } 1527 1528 static struct rdev_sysfs_entry 1529 rdev_state = __ATTR_RO(state); 1530 1531 static ssize_t 1532 super_show(mdk_rdev_t *rdev, char *page) 1533 { 1534 if (rdev->sb_loaded && rdev->sb_size) { 1535 memcpy(page, page_address(rdev->sb_page), rdev->sb_size); 1536 return rdev->sb_size; 1537 } else 1538 return 0; 1539 } 1540 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); 1541 1542 static struct attribute *rdev_default_attrs[] = { 1543 &rdev_state.attr, 1544 &rdev_super.attr, 1545 NULL, 1546 }; 1547 static ssize_t 1548 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 1549 { 1550 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 1551 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 1552 1553 if (!entry->show) 1554 return -EIO; 1555 return entry->show(rdev, page); 1556 } 1557 1558 static ssize_t 1559 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 1560 const char *page, size_t length) 1561 { 1562 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 1563 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 1564 1565 if (!entry->store) 1566 return -EIO; 1567 return entry->store(rdev, page, length); 1568 } 1569 1570 static void rdev_free(struct kobject *ko) 1571 { 1572 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); 1573 kfree(rdev); 1574 } 1575 static struct sysfs_ops rdev_sysfs_ops = { 1576 .show = rdev_attr_show, 1577 .store = rdev_attr_store, 1578 }; 1579 static struct kobj_type rdev_ktype = { 1580 .release = rdev_free, 1581 .sysfs_ops = &rdev_sysfs_ops, 1582 .default_attrs = rdev_default_attrs, 1583 }; 1584 1585 /* 1586 * Import a device. If 'super_format' >= 0, then sanity check the superblock 1587 * 1588 * mark the device faulty if: 1589 * 1590 * - the device is nonexistent (zero size) 1591 * - the device has no valid superblock 1592 * 1593 * a faulty rdev _never_ has rdev->sb set. 1594 */ 1595 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) 1596 { 1597 char b[BDEVNAME_SIZE]; 1598 int err; 1599 mdk_rdev_t *rdev; 1600 sector_t size; 1601 1602 rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL); 1603 if (!rdev) { 1604 printk(KERN_ERR "md: could not alloc mem for new device!\n"); 1605 return ERR_PTR(-ENOMEM); 1606 } 1607 memset(rdev, 0, sizeof(*rdev)); 1608 1609 if ((err = alloc_disk_sb(rdev))) 1610 goto abort_free; 1611 1612 err = lock_rdev(rdev, newdev); 1613 if (err) 1614 goto abort_free; 1615 1616 rdev->kobj.parent = NULL; 1617 rdev->kobj.ktype = &rdev_ktype; 1618 kobject_init(&rdev->kobj); 1619 1620 rdev->desc_nr = -1; 1621 rdev->flags = 0; 1622 rdev->data_offset = 0; 1623 atomic_set(&rdev->nr_pending, 0); 1624 atomic_set(&rdev->read_errors, 0); 1625 1626 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 1627 if (!size) { 1628 printk(KERN_WARNING 1629 "md: %s has zero or unknown size, marking faulty!\n", 1630 bdevname(rdev->bdev,b)); 1631 err = -EINVAL; 1632 goto abort_free; 1633 } 1634 1635 if (super_format >= 0) { 1636 err = super_types[super_format]. 1637 load_super(rdev, NULL, super_minor); 1638 if (err == -EINVAL) { 1639 printk(KERN_WARNING 1640 "md: %s has invalid sb, not importing!\n", 1641 bdevname(rdev->bdev,b)); 1642 goto abort_free; 1643 } 1644 if (err < 0) { 1645 printk(KERN_WARNING 1646 "md: could not read %s's sb, not importing!\n", 1647 bdevname(rdev->bdev,b)); 1648 goto abort_free; 1649 } 1650 } 1651 INIT_LIST_HEAD(&rdev->same_set); 1652 1653 return rdev; 1654 1655 abort_free: 1656 if (rdev->sb_page) { 1657 if (rdev->bdev) 1658 unlock_rdev(rdev); 1659 free_disk_sb(rdev); 1660 } 1661 kfree(rdev); 1662 return ERR_PTR(err); 1663 } 1664 1665 /* 1666 * Check a full RAID array for plausibility 1667 */ 1668 1669 1670 static void analyze_sbs(mddev_t * mddev) 1671 { 1672 int i; 1673 struct list_head *tmp; 1674 mdk_rdev_t *rdev, *freshest; 1675 char b[BDEVNAME_SIZE]; 1676 1677 freshest = NULL; 1678 ITERATE_RDEV(mddev,rdev,tmp) 1679 switch (super_types[mddev->major_version]. 1680 load_super(rdev, freshest, mddev->minor_version)) { 1681 case 1: 1682 freshest = rdev; 1683 break; 1684 case 0: 1685 break; 1686 default: 1687 printk( KERN_ERR \ 1688 "md: fatal superblock inconsistency in %s" 1689 " -- removing from array\n", 1690 bdevname(rdev->bdev,b)); 1691 kick_rdev_from_array(rdev); 1692 } 1693 1694 1695 super_types[mddev->major_version]. 1696 validate_super(mddev, freshest); 1697 1698 i = 0; 1699 ITERATE_RDEV(mddev,rdev,tmp) { 1700 if (rdev != freshest) 1701 if (super_types[mddev->major_version]. 1702 validate_super(mddev, rdev)) { 1703 printk(KERN_WARNING "md: kicking non-fresh %s" 1704 " from array!\n", 1705 bdevname(rdev->bdev,b)); 1706 kick_rdev_from_array(rdev); 1707 continue; 1708 } 1709 if (mddev->level == LEVEL_MULTIPATH) { 1710 rdev->desc_nr = i++; 1711 rdev->raid_disk = rdev->desc_nr; 1712 set_bit(In_sync, &rdev->flags); 1713 } 1714 } 1715 1716 1717 1718 if (mddev->recovery_cp != MaxSector && 1719 mddev->level >= 1) 1720 printk(KERN_ERR "md: %s: raid array is not clean" 1721 " -- starting background reconstruction\n", 1722 mdname(mddev)); 1723 1724 } 1725 1726 static ssize_t 1727 level_show(mddev_t *mddev, char *page) 1728 { 1729 mdk_personality_t *p = mddev->pers; 1730 if (p == NULL) 1731 return 0; 1732 if (mddev->level >= 0) 1733 return sprintf(page, "RAID-%d\n", mddev->level); 1734 else 1735 return sprintf(page, "%s\n", p->name); 1736 } 1737 1738 static struct md_sysfs_entry md_level = __ATTR_RO(level); 1739 1740 static ssize_t 1741 raid_disks_show(mddev_t *mddev, char *page) 1742 { 1743 return sprintf(page, "%d\n", mddev->raid_disks); 1744 } 1745 1746 static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks); 1747 1748 static ssize_t 1749 md_show_scan(mddev_t *mddev, char *page) 1750 { 1751 char *type = "none"; 1752 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 1753 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { 1754 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 1755 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 1756 type = "resync"; 1757 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 1758 type = "check"; 1759 else 1760 type = "repair"; 1761 } else 1762 type = "recover"; 1763 } 1764 return sprintf(page, "%s\n", type); 1765 } 1766 1767 static ssize_t 1768 md_store_scan(mddev_t *mddev, const char *page, size_t len) 1769 { 1770 int canscan=0; 1771 1772 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 1773 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 1774 return -EBUSY; 1775 1776 if (mddev->pers && mddev->pers->sync_request) 1777 canscan=1; 1778 1779 if (!canscan) 1780 return -EINVAL; 1781 1782 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0) 1783 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 1784 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0) 1785 return -EINVAL; 1786 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 1787 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 1788 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 1789 md_wakeup_thread(mddev->thread); 1790 return len; 1791 } 1792 1793 static ssize_t 1794 mismatch_cnt_show(mddev_t *mddev, char *page) 1795 { 1796 return sprintf(page, "%llu\n", 1797 (unsigned long long) mddev->resync_mismatches); 1798 } 1799 1800 static struct md_sysfs_entry 1801 md_scan_mode = __ATTR(scan_mode, S_IRUGO|S_IWUSR, md_show_scan, md_store_scan); 1802 1803 1804 static struct md_sysfs_entry 1805 md_mismatches = __ATTR_RO(mismatch_cnt); 1806 1807 static struct attribute *md_default_attrs[] = { 1808 &md_level.attr, 1809 &md_raid_disks.attr, 1810 &md_scan_mode.attr, 1811 &md_mismatches.attr, 1812 NULL, 1813 }; 1814 1815 static ssize_t 1816 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 1817 { 1818 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 1819 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 1820 ssize_t rv; 1821 1822 if (!entry->show) 1823 return -EIO; 1824 mddev_lock(mddev); 1825 rv = entry->show(mddev, page); 1826 mddev_unlock(mddev); 1827 return rv; 1828 } 1829 1830 static ssize_t 1831 md_attr_store(struct kobject *kobj, struct attribute *attr, 1832 const char *page, size_t length) 1833 { 1834 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 1835 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 1836 ssize_t rv; 1837 1838 if (!entry->store) 1839 return -EIO; 1840 mddev_lock(mddev); 1841 rv = entry->store(mddev, page, length); 1842 mddev_unlock(mddev); 1843 return rv; 1844 } 1845 1846 static void md_free(struct kobject *ko) 1847 { 1848 mddev_t *mddev = container_of(ko, mddev_t, kobj); 1849 kfree(mddev); 1850 } 1851 1852 static struct sysfs_ops md_sysfs_ops = { 1853 .show = md_attr_show, 1854 .store = md_attr_store, 1855 }; 1856 static struct kobj_type md_ktype = { 1857 .release = md_free, 1858 .sysfs_ops = &md_sysfs_ops, 1859 .default_attrs = md_default_attrs, 1860 }; 1861 1862 int mdp_major = 0; 1863 1864 static struct kobject *md_probe(dev_t dev, int *part, void *data) 1865 { 1866 static DECLARE_MUTEX(disks_sem); 1867 mddev_t *mddev = mddev_find(dev); 1868 struct gendisk *disk; 1869 int partitioned = (MAJOR(dev) != MD_MAJOR); 1870 int shift = partitioned ? MdpMinorShift : 0; 1871 int unit = MINOR(dev) >> shift; 1872 1873 if (!mddev) 1874 return NULL; 1875 1876 down(&disks_sem); 1877 if (mddev->gendisk) { 1878 up(&disks_sem); 1879 mddev_put(mddev); 1880 return NULL; 1881 } 1882 disk = alloc_disk(1 << shift); 1883 if (!disk) { 1884 up(&disks_sem); 1885 mddev_put(mddev); 1886 return NULL; 1887 } 1888 disk->major = MAJOR(dev); 1889 disk->first_minor = unit << shift; 1890 if (partitioned) { 1891 sprintf(disk->disk_name, "md_d%d", unit); 1892 sprintf(disk->devfs_name, "md/d%d", unit); 1893 } else { 1894 sprintf(disk->disk_name, "md%d", unit); 1895 sprintf(disk->devfs_name, "md/%d", unit); 1896 } 1897 disk->fops = &md_fops; 1898 disk->private_data = mddev; 1899 disk->queue = mddev->queue; 1900 add_disk(disk); 1901 mddev->gendisk = disk; 1902 up(&disks_sem); 1903 mddev->kobj.parent = &disk->kobj; 1904 mddev->kobj.k_name = NULL; 1905 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); 1906 mddev->kobj.ktype = &md_ktype; 1907 kobject_register(&mddev->kobj); 1908 return NULL; 1909 } 1910 1911 void md_wakeup_thread(mdk_thread_t *thread); 1912 1913 static void md_safemode_timeout(unsigned long data) 1914 { 1915 mddev_t *mddev = (mddev_t *) data; 1916 1917 mddev->safemode = 1; 1918 md_wakeup_thread(mddev->thread); 1919 } 1920 1921 1922 static int do_md_run(mddev_t * mddev) 1923 { 1924 int pnum, err; 1925 int chunk_size; 1926 struct list_head *tmp; 1927 mdk_rdev_t *rdev; 1928 struct gendisk *disk; 1929 char b[BDEVNAME_SIZE]; 1930 1931 if (list_empty(&mddev->disks)) 1932 /* cannot run an array with no devices.. */ 1933 return -EINVAL; 1934 1935 if (mddev->pers) 1936 return -EBUSY; 1937 1938 /* 1939 * Analyze all RAID superblock(s) 1940 */ 1941 if (!mddev->raid_disks) 1942 analyze_sbs(mddev); 1943 1944 chunk_size = mddev->chunk_size; 1945 pnum = level_to_pers(mddev->level); 1946 1947 if ((pnum != MULTIPATH) && (pnum != RAID1)) { 1948 if (!chunk_size) { 1949 /* 1950 * 'default chunksize' in the old md code used to 1951 * be PAGE_SIZE, baaad. 1952 * we abort here to be on the safe side. We don't 1953 * want to continue the bad practice. 1954 */ 1955 printk(KERN_ERR 1956 "no chunksize specified, see 'man raidtab'\n"); 1957 return -EINVAL; 1958 } 1959 if (chunk_size > MAX_CHUNK_SIZE) { 1960 printk(KERN_ERR "too big chunk_size: %d > %d\n", 1961 chunk_size, MAX_CHUNK_SIZE); 1962 return -EINVAL; 1963 } 1964 /* 1965 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE 1966 */ 1967 if ( (1 << ffz(~chunk_size)) != chunk_size) { 1968 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); 1969 return -EINVAL; 1970 } 1971 if (chunk_size < PAGE_SIZE) { 1972 printk(KERN_ERR "too small chunk_size: %d < %ld\n", 1973 chunk_size, PAGE_SIZE); 1974 return -EINVAL; 1975 } 1976 1977 /* devices must have minimum size of one chunk */ 1978 ITERATE_RDEV(mddev,rdev,tmp) { 1979 if (test_bit(Faulty, &rdev->flags)) 1980 continue; 1981 if (rdev->size < chunk_size / 1024) { 1982 printk(KERN_WARNING 1983 "md: Dev %s smaller than chunk_size:" 1984 " %lluk < %dk\n", 1985 bdevname(rdev->bdev,b), 1986 (unsigned long long)rdev->size, 1987 chunk_size / 1024); 1988 return -EINVAL; 1989 } 1990 } 1991 } 1992 1993 #ifdef CONFIG_KMOD 1994 if (!pers[pnum]) 1995 { 1996 request_module("md-personality-%d", pnum); 1997 } 1998 #endif 1999 2000 /* 2001 * Drop all container device buffers, from now on 2002 * the only valid external interface is through the md 2003 * device. 2004 * Also find largest hardsector size 2005 */ 2006 ITERATE_RDEV(mddev,rdev,tmp) { 2007 if (test_bit(Faulty, &rdev->flags)) 2008 continue; 2009 sync_blockdev(rdev->bdev); 2010 invalidate_bdev(rdev->bdev, 0); 2011 } 2012 2013 md_probe(mddev->unit, NULL, NULL); 2014 disk = mddev->gendisk; 2015 if (!disk) 2016 return -ENOMEM; 2017 2018 spin_lock(&pers_lock); 2019 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) { 2020 spin_unlock(&pers_lock); 2021 printk(KERN_WARNING "md: personality %d is not loaded!\n", 2022 pnum); 2023 return -EINVAL; 2024 } 2025 2026 mddev->pers = pers[pnum]; 2027 spin_unlock(&pers_lock); 2028 2029 mddev->recovery = 0; 2030 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ 2031 mddev->barriers_work = 1; 2032 2033 if (start_readonly) 2034 mddev->ro = 2; /* read-only, but switch on first write */ 2035 2036 /* before we start the array running, initialise the bitmap */ 2037 err = bitmap_create(mddev); 2038 if (err) 2039 printk(KERN_ERR "%s: failed to create bitmap (%d)\n", 2040 mdname(mddev), err); 2041 else 2042 err = mddev->pers->run(mddev); 2043 if (err) { 2044 printk(KERN_ERR "md: pers->run() failed ...\n"); 2045 module_put(mddev->pers->owner); 2046 mddev->pers = NULL; 2047 bitmap_destroy(mddev); 2048 return err; 2049 } 2050 atomic_set(&mddev->writes_pending,0); 2051 mddev->safemode = 0; 2052 mddev->safemode_timer.function = md_safemode_timeout; 2053 mddev->safemode_timer.data = (unsigned long) mddev; 2054 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ 2055 mddev->in_sync = 1; 2056 2057 ITERATE_RDEV(mddev,rdev,tmp) 2058 if (rdev->raid_disk >= 0) { 2059 char nm[20]; 2060 sprintf(nm, "rd%d", rdev->raid_disk); 2061 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 2062 } 2063 2064 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2065 md_wakeup_thread(mddev->thread); 2066 2067 if (mddev->sb_dirty) 2068 md_update_sb(mddev); 2069 2070 set_capacity(disk, mddev->array_size<<1); 2071 2072 /* If we call blk_queue_make_request here, it will 2073 * re-initialise max_sectors etc which may have been 2074 * refined inside -> run. So just set the bits we need to set. 2075 * Most initialisation happended when we called 2076 * blk_queue_make_request(..., md_fail_request) 2077 * earlier. 2078 */ 2079 mddev->queue->queuedata = mddev; 2080 mddev->queue->make_request_fn = mddev->pers->make_request; 2081 2082 mddev->changed = 1; 2083 return 0; 2084 } 2085 2086 static int restart_array(mddev_t *mddev) 2087 { 2088 struct gendisk *disk = mddev->gendisk; 2089 int err; 2090 2091 /* 2092 * Complain if it has no devices 2093 */ 2094 err = -ENXIO; 2095 if (list_empty(&mddev->disks)) 2096 goto out; 2097 2098 if (mddev->pers) { 2099 err = -EBUSY; 2100 if (!mddev->ro) 2101 goto out; 2102 2103 mddev->safemode = 0; 2104 mddev->ro = 0; 2105 set_disk_ro(disk, 0); 2106 2107 printk(KERN_INFO "md: %s switched to read-write mode.\n", 2108 mdname(mddev)); 2109 /* 2110 * Kick recovery or resync if necessary 2111 */ 2112 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2113 md_wakeup_thread(mddev->thread); 2114 err = 0; 2115 } else { 2116 printk(KERN_ERR "md: %s has no personality assigned.\n", 2117 mdname(mddev)); 2118 err = -EINVAL; 2119 } 2120 2121 out: 2122 return err; 2123 } 2124 2125 static int do_md_stop(mddev_t * mddev, int ro) 2126 { 2127 int err = 0; 2128 struct gendisk *disk = mddev->gendisk; 2129 2130 if (mddev->pers) { 2131 if (atomic_read(&mddev->active)>2) { 2132 printk("md: %s still in use.\n",mdname(mddev)); 2133 return -EBUSY; 2134 } 2135 2136 if (mddev->sync_thread) { 2137 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 2138 md_unregister_thread(mddev->sync_thread); 2139 mddev->sync_thread = NULL; 2140 } 2141 2142 del_timer_sync(&mddev->safemode_timer); 2143 2144 invalidate_partition(disk, 0); 2145 2146 if (ro) { 2147 err = -ENXIO; 2148 if (mddev->ro==1) 2149 goto out; 2150 mddev->ro = 1; 2151 } else { 2152 bitmap_flush(mddev); 2153 md_super_wait(mddev); 2154 if (mddev->ro) 2155 set_disk_ro(disk, 0); 2156 blk_queue_make_request(mddev->queue, md_fail_request); 2157 mddev->pers->stop(mddev); 2158 module_put(mddev->pers->owner); 2159 mddev->pers = NULL; 2160 if (mddev->ro) 2161 mddev->ro = 0; 2162 } 2163 if (!mddev->in_sync) { 2164 /* mark array as shutdown cleanly */ 2165 mddev->in_sync = 1; 2166 md_update_sb(mddev); 2167 } 2168 if (ro) 2169 set_disk_ro(disk, 1); 2170 } 2171 2172 bitmap_destroy(mddev); 2173 if (mddev->bitmap_file) { 2174 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); 2175 fput(mddev->bitmap_file); 2176 mddev->bitmap_file = NULL; 2177 } 2178 mddev->bitmap_offset = 0; 2179 2180 /* 2181 * Free resources if final stop 2182 */ 2183 if (!ro) { 2184 mdk_rdev_t *rdev; 2185 struct list_head *tmp; 2186 struct gendisk *disk; 2187 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); 2188 2189 ITERATE_RDEV(mddev,rdev,tmp) 2190 if (rdev->raid_disk >= 0) { 2191 char nm[20]; 2192 sprintf(nm, "rd%d", rdev->raid_disk); 2193 sysfs_remove_link(&mddev->kobj, nm); 2194 } 2195 2196 export_array(mddev); 2197 2198 mddev->array_size = 0; 2199 disk = mddev->gendisk; 2200 if (disk) 2201 set_capacity(disk, 0); 2202 mddev->changed = 1; 2203 } else 2204 printk(KERN_INFO "md: %s switched to read-only mode.\n", 2205 mdname(mddev)); 2206 err = 0; 2207 out: 2208 return err; 2209 } 2210 2211 static void autorun_array(mddev_t *mddev) 2212 { 2213 mdk_rdev_t *rdev; 2214 struct list_head *tmp; 2215 int err; 2216 2217 if (list_empty(&mddev->disks)) 2218 return; 2219 2220 printk(KERN_INFO "md: running: "); 2221 2222 ITERATE_RDEV(mddev,rdev,tmp) { 2223 char b[BDEVNAME_SIZE]; 2224 printk("<%s>", bdevname(rdev->bdev,b)); 2225 } 2226 printk("\n"); 2227 2228 err = do_md_run (mddev); 2229 if (err) { 2230 printk(KERN_WARNING "md: do_md_run() returned %d\n", err); 2231 do_md_stop (mddev, 0); 2232 } 2233 } 2234 2235 /* 2236 * lets try to run arrays based on all disks that have arrived 2237 * until now. (those are in pending_raid_disks) 2238 * 2239 * the method: pick the first pending disk, collect all disks with 2240 * the same UUID, remove all from the pending list and put them into 2241 * the 'same_array' list. Then order this list based on superblock 2242 * update time (freshest comes first), kick out 'old' disks and 2243 * compare superblocks. If everything's fine then run it. 2244 * 2245 * If "unit" is allocated, then bump its reference count 2246 */ 2247 static void autorun_devices(int part) 2248 { 2249 struct list_head candidates; 2250 struct list_head *tmp; 2251 mdk_rdev_t *rdev0, *rdev; 2252 mddev_t *mddev; 2253 char b[BDEVNAME_SIZE]; 2254 2255 printk(KERN_INFO "md: autorun ...\n"); 2256 while (!list_empty(&pending_raid_disks)) { 2257 dev_t dev; 2258 rdev0 = list_entry(pending_raid_disks.next, 2259 mdk_rdev_t, same_set); 2260 2261 printk(KERN_INFO "md: considering %s ...\n", 2262 bdevname(rdev0->bdev,b)); 2263 INIT_LIST_HEAD(&candidates); 2264 ITERATE_RDEV_PENDING(rdev,tmp) 2265 if (super_90_load(rdev, rdev0, 0) >= 0) { 2266 printk(KERN_INFO "md: adding %s ...\n", 2267 bdevname(rdev->bdev,b)); 2268 list_move(&rdev->same_set, &candidates); 2269 } 2270 /* 2271 * now we have a set of devices, with all of them having 2272 * mostly sane superblocks. It's time to allocate the 2273 * mddev. 2274 */ 2275 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { 2276 printk(KERN_INFO "md: unit number in %s is bad: %d\n", 2277 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 2278 break; 2279 } 2280 if (part) 2281 dev = MKDEV(mdp_major, 2282 rdev0->preferred_minor << MdpMinorShift); 2283 else 2284 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 2285 2286 md_probe(dev, NULL, NULL); 2287 mddev = mddev_find(dev); 2288 if (!mddev) { 2289 printk(KERN_ERR 2290 "md: cannot allocate memory for md drive.\n"); 2291 break; 2292 } 2293 if (mddev_lock(mddev)) 2294 printk(KERN_WARNING "md: %s locked, cannot run\n", 2295 mdname(mddev)); 2296 else if (mddev->raid_disks || mddev->major_version 2297 || !list_empty(&mddev->disks)) { 2298 printk(KERN_WARNING 2299 "md: %s already running, cannot run %s\n", 2300 mdname(mddev), bdevname(rdev0->bdev,b)); 2301 mddev_unlock(mddev); 2302 } else { 2303 printk(KERN_INFO "md: created %s\n", mdname(mddev)); 2304 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { 2305 list_del_init(&rdev->same_set); 2306 if (bind_rdev_to_array(rdev, mddev)) 2307 export_rdev(rdev); 2308 } 2309 autorun_array(mddev); 2310 mddev_unlock(mddev); 2311 } 2312 /* on success, candidates will be empty, on error 2313 * it won't... 2314 */ 2315 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) 2316 export_rdev(rdev); 2317 mddev_put(mddev); 2318 } 2319 printk(KERN_INFO "md: ... autorun DONE.\n"); 2320 } 2321 2322 /* 2323 * import RAID devices based on one partition 2324 * if possible, the array gets run as well. 2325 */ 2326 2327 static int autostart_array(dev_t startdev) 2328 { 2329 char b[BDEVNAME_SIZE]; 2330 int err = -EINVAL, i; 2331 mdp_super_t *sb = NULL; 2332 mdk_rdev_t *start_rdev = NULL, *rdev; 2333 2334 start_rdev = md_import_device(startdev, 0, 0); 2335 if (IS_ERR(start_rdev)) 2336 return err; 2337 2338 2339 /* NOTE: this can only work for 0.90.0 superblocks */ 2340 sb = (mdp_super_t*)page_address(start_rdev->sb_page); 2341 if (sb->major_version != 0 || 2342 sb->minor_version != 90 ) { 2343 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); 2344 export_rdev(start_rdev); 2345 return err; 2346 } 2347 2348 if (test_bit(Faulty, &start_rdev->flags)) { 2349 printk(KERN_WARNING 2350 "md: can not autostart based on faulty %s!\n", 2351 bdevname(start_rdev->bdev,b)); 2352 export_rdev(start_rdev); 2353 return err; 2354 } 2355 list_add(&start_rdev->same_set, &pending_raid_disks); 2356 2357 for (i = 0; i < MD_SB_DISKS; i++) { 2358 mdp_disk_t *desc = sb->disks + i; 2359 dev_t dev = MKDEV(desc->major, desc->minor); 2360 2361 if (!dev) 2362 continue; 2363 if (dev == startdev) 2364 continue; 2365 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) 2366 continue; 2367 rdev = md_import_device(dev, 0, 0); 2368 if (IS_ERR(rdev)) 2369 continue; 2370 2371 list_add(&rdev->same_set, &pending_raid_disks); 2372 } 2373 2374 /* 2375 * possibly return codes 2376 */ 2377 autorun_devices(0); 2378 return 0; 2379 2380 } 2381 2382 2383 static int get_version(void __user * arg) 2384 { 2385 mdu_version_t ver; 2386 2387 ver.major = MD_MAJOR_VERSION; 2388 ver.minor = MD_MINOR_VERSION; 2389 ver.patchlevel = MD_PATCHLEVEL_VERSION; 2390 2391 if (copy_to_user(arg, &ver, sizeof(ver))) 2392 return -EFAULT; 2393 2394 return 0; 2395 } 2396 2397 static int get_array_info(mddev_t * mddev, void __user * arg) 2398 { 2399 mdu_array_info_t info; 2400 int nr,working,active,failed,spare; 2401 mdk_rdev_t *rdev; 2402 struct list_head *tmp; 2403 2404 nr=working=active=failed=spare=0; 2405 ITERATE_RDEV(mddev,rdev,tmp) { 2406 nr++; 2407 if (test_bit(Faulty, &rdev->flags)) 2408 failed++; 2409 else { 2410 working++; 2411 if (test_bit(In_sync, &rdev->flags)) 2412 active++; 2413 else 2414 spare++; 2415 } 2416 } 2417 2418 info.major_version = mddev->major_version; 2419 info.minor_version = mddev->minor_version; 2420 info.patch_version = MD_PATCHLEVEL_VERSION; 2421 info.ctime = mddev->ctime; 2422 info.level = mddev->level; 2423 info.size = mddev->size; 2424 info.nr_disks = nr; 2425 info.raid_disks = mddev->raid_disks; 2426 info.md_minor = mddev->md_minor; 2427 info.not_persistent= !mddev->persistent; 2428 2429 info.utime = mddev->utime; 2430 info.state = 0; 2431 if (mddev->in_sync) 2432 info.state = (1<<MD_SB_CLEAN); 2433 if (mddev->bitmap && mddev->bitmap_offset) 2434 info.state = (1<<MD_SB_BITMAP_PRESENT); 2435 info.active_disks = active; 2436 info.working_disks = working; 2437 info.failed_disks = failed; 2438 info.spare_disks = spare; 2439 2440 info.layout = mddev->layout; 2441 info.chunk_size = mddev->chunk_size; 2442 2443 if (copy_to_user(arg, &info, sizeof(info))) 2444 return -EFAULT; 2445 2446 return 0; 2447 } 2448 2449 static int get_bitmap_file(mddev_t * mddev, void __user * arg) 2450 { 2451 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 2452 char *ptr, *buf = NULL; 2453 int err = -ENOMEM; 2454 2455 file = kmalloc(sizeof(*file), GFP_KERNEL); 2456 if (!file) 2457 goto out; 2458 2459 /* bitmap disabled, zero the first byte and copy out */ 2460 if (!mddev->bitmap || !mddev->bitmap->file) { 2461 file->pathname[0] = '\0'; 2462 goto copy_out; 2463 } 2464 2465 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); 2466 if (!buf) 2467 goto out; 2468 2469 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); 2470 if (!ptr) 2471 goto out; 2472 2473 strcpy(file->pathname, ptr); 2474 2475 copy_out: 2476 err = 0; 2477 if (copy_to_user(arg, file, sizeof(*file))) 2478 err = -EFAULT; 2479 out: 2480 kfree(buf); 2481 kfree(file); 2482 return err; 2483 } 2484 2485 static int get_disk_info(mddev_t * mddev, void __user * arg) 2486 { 2487 mdu_disk_info_t info; 2488 unsigned int nr; 2489 mdk_rdev_t *rdev; 2490 2491 if (copy_from_user(&info, arg, sizeof(info))) 2492 return -EFAULT; 2493 2494 nr = info.number; 2495 2496 rdev = find_rdev_nr(mddev, nr); 2497 if (rdev) { 2498 info.major = MAJOR(rdev->bdev->bd_dev); 2499 info.minor = MINOR(rdev->bdev->bd_dev); 2500 info.raid_disk = rdev->raid_disk; 2501 info.state = 0; 2502 if (test_bit(Faulty, &rdev->flags)) 2503 info.state |= (1<<MD_DISK_FAULTY); 2504 else if (test_bit(In_sync, &rdev->flags)) { 2505 info.state |= (1<<MD_DISK_ACTIVE); 2506 info.state |= (1<<MD_DISK_SYNC); 2507 } 2508 if (test_bit(WriteMostly, &rdev->flags)) 2509 info.state |= (1<<MD_DISK_WRITEMOSTLY); 2510 } else { 2511 info.major = info.minor = 0; 2512 info.raid_disk = -1; 2513 info.state = (1<<MD_DISK_REMOVED); 2514 } 2515 2516 if (copy_to_user(arg, &info, sizeof(info))) 2517 return -EFAULT; 2518 2519 return 0; 2520 } 2521 2522 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) 2523 { 2524 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 2525 mdk_rdev_t *rdev; 2526 dev_t dev = MKDEV(info->major,info->minor); 2527 2528 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 2529 return -EOVERFLOW; 2530 2531 if (!mddev->raid_disks) { 2532 int err; 2533 /* expecting a device which has a superblock */ 2534 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 2535 if (IS_ERR(rdev)) { 2536 printk(KERN_WARNING 2537 "md: md_import_device returned %ld\n", 2538 PTR_ERR(rdev)); 2539 return PTR_ERR(rdev); 2540 } 2541 if (!list_empty(&mddev->disks)) { 2542 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, 2543 mdk_rdev_t, same_set); 2544 int err = super_types[mddev->major_version] 2545 .load_super(rdev, rdev0, mddev->minor_version); 2546 if (err < 0) { 2547 printk(KERN_WARNING 2548 "md: %s has different UUID to %s\n", 2549 bdevname(rdev->bdev,b), 2550 bdevname(rdev0->bdev,b2)); 2551 export_rdev(rdev); 2552 return -EINVAL; 2553 } 2554 } 2555 err = bind_rdev_to_array(rdev, mddev); 2556 if (err) 2557 export_rdev(rdev); 2558 return err; 2559 } 2560 2561 /* 2562 * add_new_disk can be used once the array is assembled 2563 * to add "hot spares". They must already have a superblock 2564 * written 2565 */ 2566 if (mddev->pers) { 2567 int err; 2568 if (!mddev->pers->hot_add_disk) { 2569 printk(KERN_WARNING 2570 "%s: personality does not support diskops!\n", 2571 mdname(mddev)); 2572 return -EINVAL; 2573 } 2574 if (mddev->persistent) 2575 rdev = md_import_device(dev, mddev->major_version, 2576 mddev->minor_version); 2577 else 2578 rdev = md_import_device(dev, -1, -1); 2579 if (IS_ERR(rdev)) { 2580 printk(KERN_WARNING 2581 "md: md_import_device returned %ld\n", 2582 PTR_ERR(rdev)); 2583 return PTR_ERR(rdev); 2584 } 2585 /* set save_raid_disk if appropriate */ 2586 if (!mddev->persistent) { 2587 if (info->state & (1<<MD_DISK_SYNC) && 2588 info->raid_disk < mddev->raid_disks) 2589 rdev->raid_disk = info->raid_disk; 2590 else 2591 rdev->raid_disk = -1; 2592 } else 2593 super_types[mddev->major_version]. 2594 validate_super(mddev, rdev); 2595 rdev->saved_raid_disk = rdev->raid_disk; 2596 2597 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 2598 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 2599 set_bit(WriteMostly, &rdev->flags); 2600 2601 rdev->raid_disk = -1; 2602 err = bind_rdev_to_array(rdev, mddev); 2603 if (err) 2604 export_rdev(rdev); 2605 2606 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2607 md_wakeup_thread(mddev->thread); 2608 return err; 2609 } 2610 2611 /* otherwise, add_new_disk is only allowed 2612 * for major_version==0 superblocks 2613 */ 2614 if (mddev->major_version != 0) { 2615 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", 2616 mdname(mddev)); 2617 return -EINVAL; 2618 } 2619 2620 if (!(info->state & (1<<MD_DISK_FAULTY))) { 2621 int err; 2622 rdev = md_import_device (dev, -1, 0); 2623 if (IS_ERR(rdev)) { 2624 printk(KERN_WARNING 2625 "md: error, md_import_device() returned %ld\n", 2626 PTR_ERR(rdev)); 2627 return PTR_ERR(rdev); 2628 } 2629 rdev->desc_nr = info->number; 2630 if (info->raid_disk < mddev->raid_disks) 2631 rdev->raid_disk = info->raid_disk; 2632 else 2633 rdev->raid_disk = -1; 2634 2635 rdev->flags = 0; 2636 2637 if (rdev->raid_disk < mddev->raid_disks) 2638 if (info->state & (1<<MD_DISK_SYNC)) 2639 set_bit(In_sync, &rdev->flags); 2640 2641 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 2642 set_bit(WriteMostly, &rdev->flags); 2643 2644 err = bind_rdev_to_array(rdev, mddev); 2645 if (err) { 2646 export_rdev(rdev); 2647 return err; 2648 } 2649 2650 if (!mddev->persistent) { 2651 printk(KERN_INFO "md: nonpersistent superblock ...\n"); 2652 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2653 } else 2654 rdev->sb_offset = calc_dev_sboffset(rdev->bdev); 2655 rdev->size = calc_dev_size(rdev, mddev->chunk_size); 2656 2657 if (!mddev->size || (mddev->size > rdev->size)) 2658 mddev->size = rdev->size; 2659 } 2660 2661 return 0; 2662 } 2663 2664 static int hot_remove_disk(mddev_t * mddev, dev_t dev) 2665 { 2666 char b[BDEVNAME_SIZE]; 2667 mdk_rdev_t *rdev; 2668 2669 if (!mddev->pers) 2670 return -ENODEV; 2671 2672 rdev = find_rdev(mddev, dev); 2673 if (!rdev) 2674 return -ENXIO; 2675 2676 if (rdev->raid_disk >= 0) 2677 goto busy; 2678 2679 kick_rdev_from_array(rdev); 2680 md_update_sb(mddev); 2681 2682 return 0; 2683 busy: 2684 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", 2685 bdevname(rdev->bdev,b), mdname(mddev)); 2686 return -EBUSY; 2687 } 2688 2689 static int hot_add_disk(mddev_t * mddev, dev_t dev) 2690 { 2691 char b[BDEVNAME_SIZE]; 2692 int err; 2693 unsigned int size; 2694 mdk_rdev_t *rdev; 2695 2696 if (!mddev->pers) 2697 return -ENODEV; 2698 2699 if (mddev->major_version != 0) { 2700 printk(KERN_WARNING "%s: HOT_ADD may only be used with" 2701 " version-0 superblocks.\n", 2702 mdname(mddev)); 2703 return -EINVAL; 2704 } 2705 if (!mddev->pers->hot_add_disk) { 2706 printk(KERN_WARNING 2707 "%s: personality does not support diskops!\n", 2708 mdname(mddev)); 2709 return -EINVAL; 2710 } 2711 2712 rdev = md_import_device (dev, -1, 0); 2713 if (IS_ERR(rdev)) { 2714 printk(KERN_WARNING 2715 "md: error, md_import_device() returned %ld\n", 2716 PTR_ERR(rdev)); 2717 return -EINVAL; 2718 } 2719 2720 if (mddev->persistent) 2721 rdev->sb_offset = calc_dev_sboffset(rdev->bdev); 2722 else 2723 rdev->sb_offset = 2724 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2725 2726 size = calc_dev_size(rdev, mddev->chunk_size); 2727 rdev->size = size; 2728 2729 if (size < mddev->size) { 2730 printk(KERN_WARNING 2731 "%s: disk size %llu blocks < array size %llu\n", 2732 mdname(mddev), (unsigned long long)size, 2733 (unsigned long long)mddev->size); 2734 err = -ENOSPC; 2735 goto abort_export; 2736 } 2737 2738 if (test_bit(Faulty, &rdev->flags)) { 2739 printk(KERN_WARNING 2740 "md: can not hot-add faulty %s disk to %s!\n", 2741 bdevname(rdev->bdev,b), mdname(mddev)); 2742 err = -EINVAL; 2743 goto abort_export; 2744 } 2745 clear_bit(In_sync, &rdev->flags); 2746 rdev->desc_nr = -1; 2747 bind_rdev_to_array(rdev, mddev); 2748 2749 /* 2750 * The rest should better be atomic, we can have disk failures 2751 * noticed in interrupt contexts ... 2752 */ 2753 2754 if (rdev->desc_nr == mddev->max_disks) { 2755 printk(KERN_WARNING "%s: can not hot-add to full array!\n", 2756 mdname(mddev)); 2757 err = -EBUSY; 2758 goto abort_unbind_export; 2759 } 2760 2761 rdev->raid_disk = -1; 2762 2763 md_update_sb(mddev); 2764 2765 /* 2766 * Kick recovery, maybe this spare has to be added to the 2767 * array immediately. 2768 */ 2769 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2770 md_wakeup_thread(mddev->thread); 2771 2772 return 0; 2773 2774 abort_unbind_export: 2775 unbind_rdev_from_array(rdev); 2776 2777 abort_export: 2778 export_rdev(rdev); 2779 return err; 2780 } 2781 2782 /* similar to deny_write_access, but accounts for our holding a reference 2783 * to the file ourselves */ 2784 static int deny_bitmap_write_access(struct file * file) 2785 { 2786 struct inode *inode = file->f_mapping->host; 2787 2788 spin_lock(&inode->i_lock); 2789 if (atomic_read(&inode->i_writecount) > 1) { 2790 spin_unlock(&inode->i_lock); 2791 return -ETXTBSY; 2792 } 2793 atomic_set(&inode->i_writecount, -1); 2794 spin_unlock(&inode->i_lock); 2795 2796 return 0; 2797 } 2798 2799 static int set_bitmap_file(mddev_t *mddev, int fd) 2800 { 2801 int err; 2802 2803 if (mddev->pers) { 2804 if (!mddev->pers->quiesce) 2805 return -EBUSY; 2806 if (mddev->recovery || mddev->sync_thread) 2807 return -EBUSY; 2808 /* we should be able to change the bitmap.. */ 2809 } 2810 2811 2812 if (fd >= 0) { 2813 if (mddev->bitmap) 2814 return -EEXIST; /* cannot add when bitmap is present */ 2815 mddev->bitmap_file = fget(fd); 2816 2817 if (mddev->bitmap_file == NULL) { 2818 printk(KERN_ERR "%s: error: failed to get bitmap file\n", 2819 mdname(mddev)); 2820 return -EBADF; 2821 } 2822 2823 err = deny_bitmap_write_access(mddev->bitmap_file); 2824 if (err) { 2825 printk(KERN_ERR "%s: error: bitmap file is already in use\n", 2826 mdname(mddev)); 2827 fput(mddev->bitmap_file); 2828 mddev->bitmap_file = NULL; 2829 return err; 2830 } 2831 mddev->bitmap_offset = 0; /* file overrides offset */ 2832 } else if (mddev->bitmap == NULL) 2833 return -ENOENT; /* cannot remove what isn't there */ 2834 err = 0; 2835 if (mddev->pers) { 2836 mddev->pers->quiesce(mddev, 1); 2837 if (fd >= 0) 2838 err = bitmap_create(mddev); 2839 if (fd < 0 || err) 2840 bitmap_destroy(mddev); 2841 mddev->pers->quiesce(mddev, 0); 2842 } else if (fd < 0) { 2843 if (mddev->bitmap_file) 2844 fput(mddev->bitmap_file); 2845 mddev->bitmap_file = NULL; 2846 } 2847 2848 return err; 2849 } 2850 2851 /* 2852 * set_array_info is used two different ways 2853 * The original usage is when creating a new array. 2854 * In this usage, raid_disks is > 0 and it together with 2855 * level, size, not_persistent,layout,chunksize determine the 2856 * shape of the array. 2857 * This will always create an array with a type-0.90.0 superblock. 2858 * The newer usage is when assembling an array. 2859 * In this case raid_disks will be 0, and the major_version field is 2860 * use to determine which style super-blocks are to be found on the devices. 2861 * The minor and patch _version numbers are also kept incase the 2862 * super_block handler wishes to interpret them. 2863 */ 2864 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) 2865 { 2866 2867 if (info->raid_disks == 0) { 2868 /* just setting version number for superblock loading */ 2869 if (info->major_version < 0 || 2870 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || 2871 super_types[info->major_version].name == NULL) { 2872 /* maybe try to auto-load a module? */ 2873 printk(KERN_INFO 2874 "md: superblock version %d not known\n", 2875 info->major_version); 2876 return -EINVAL; 2877 } 2878 mddev->major_version = info->major_version; 2879 mddev->minor_version = info->minor_version; 2880 mddev->patch_version = info->patch_version; 2881 return 0; 2882 } 2883 mddev->major_version = MD_MAJOR_VERSION; 2884 mddev->minor_version = MD_MINOR_VERSION; 2885 mddev->patch_version = MD_PATCHLEVEL_VERSION; 2886 mddev->ctime = get_seconds(); 2887 2888 mddev->level = info->level; 2889 mddev->size = info->size; 2890 mddev->raid_disks = info->raid_disks; 2891 /* don't set md_minor, it is determined by which /dev/md* was 2892 * openned 2893 */ 2894 if (info->state & (1<<MD_SB_CLEAN)) 2895 mddev->recovery_cp = MaxSector; 2896 else 2897 mddev->recovery_cp = 0; 2898 mddev->persistent = ! info->not_persistent; 2899 2900 mddev->layout = info->layout; 2901 mddev->chunk_size = info->chunk_size; 2902 2903 mddev->max_disks = MD_SB_DISKS; 2904 2905 mddev->sb_dirty = 1; 2906 2907 /* 2908 * Generate a 128 bit UUID 2909 */ 2910 get_random_bytes(mddev->uuid, 16); 2911 2912 return 0; 2913 } 2914 2915 /* 2916 * update_array_info is used to change the configuration of an 2917 * on-line array. 2918 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 2919 * fields in the info are checked against the array. 2920 * Any differences that cannot be handled will cause an error. 2921 * Normally, only one change can be managed at a time. 2922 */ 2923 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) 2924 { 2925 int rv = 0; 2926 int cnt = 0; 2927 int state = 0; 2928 2929 /* calculate expected state,ignoring low bits */ 2930 if (mddev->bitmap && mddev->bitmap_offset) 2931 state |= (1 << MD_SB_BITMAP_PRESENT); 2932 2933 if (mddev->major_version != info->major_version || 2934 mddev->minor_version != info->minor_version || 2935 /* mddev->patch_version != info->patch_version || */ 2936 mddev->ctime != info->ctime || 2937 mddev->level != info->level || 2938 /* mddev->layout != info->layout || */ 2939 !mddev->persistent != info->not_persistent|| 2940 mddev->chunk_size != info->chunk_size || 2941 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 2942 ((state^info->state) & 0xfffffe00) 2943 ) 2944 return -EINVAL; 2945 /* Check there is only one change */ 2946 if (mddev->size != info->size) cnt++; 2947 if (mddev->raid_disks != info->raid_disks) cnt++; 2948 if (mddev->layout != info->layout) cnt++; 2949 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; 2950 if (cnt == 0) return 0; 2951 if (cnt > 1) return -EINVAL; 2952 2953 if (mddev->layout != info->layout) { 2954 /* Change layout 2955 * we don't need to do anything at the md level, the 2956 * personality will take care of it all. 2957 */ 2958 if (mddev->pers->reconfig == NULL) 2959 return -EINVAL; 2960 else 2961 return mddev->pers->reconfig(mddev, info->layout, -1); 2962 } 2963 if (mddev->size != info->size) { 2964 mdk_rdev_t * rdev; 2965 struct list_head *tmp; 2966 if (mddev->pers->resize == NULL) 2967 return -EINVAL; 2968 /* The "size" is the amount of each device that is used. 2969 * This can only make sense for arrays with redundancy. 2970 * linear and raid0 always use whatever space is available 2971 * We can only consider changing the size if no resync 2972 * or reconstruction is happening, and if the new size 2973 * is acceptable. It must fit before the sb_offset or, 2974 * if that is <data_offset, it must fit before the 2975 * size of each device. 2976 * If size is zero, we find the largest size that fits. 2977 */ 2978 if (mddev->sync_thread) 2979 return -EBUSY; 2980 ITERATE_RDEV(mddev,rdev,tmp) { 2981 sector_t avail; 2982 int fit = (info->size == 0); 2983 if (rdev->sb_offset > rdev->data_offset) 2984 avail = (rdev->sb_offset*2) - rdev->data_offset; 2985 else 2986 avail = get_capacity(rdev->bdev->bd_disk) 2987 - rdev->data_offset; 2988 if (fit && (info->size == 0 || info->size > avail/2)) 2989 info->size = avail/2; 2990 if (avail < ((sector_t)info->size << 1)) 2991 return -ENOSPC; 2992 } 2993 rv = mddev->pers->resize(mddev, (sector_t)info->size *2); 2994 if (!rv) { 2995 struct block_device *bdev; 2996 2997 bdev = bdget_disk(mddev->gendisk, 0); 2998 if (bdev) { 2999 down(&bdev->bd_inode->i_sem); 3000 i_size_write(bdev->bd_inode, mddev->array_size << 10); 3001 up(&bdev->bd_inode->i_sem); 3002 bdput(bdev); 3003 } 3004 } 3005 } 3006 if (mddev->raid_disks != info->raid_disks) { 3007 /* change the number of raid disks */ 3008 if (mddev->pers->reshape == NULL) 3009 return -EINVAL; 3010 if (info->raid_disks <= 0 || 3011 info->raid_disks >= mddev->max_disks) 3012 return -EINVAL; 3013 if (mddev->sync_thread) 3014 return -EBUSY; 3015 rv = mddev->pers->reshape(mddev, info->raid_disks); 3016 if (!rv) { 3017 struct block_device *bdev; 3018 3019 bdev = bdget_disk(mddev->gendisk, 0); 3020 if (bdev) { 3021 down(&bdev->bd_inode->i_sem); 3022 i_size_write(bdev->bd_inode, mddev->array_size << 10); 3023 up(&bdev->bd_inode->i_sem); 3024 bdput(bdev); 3025 } 3026 } 3027 } 3028 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 3029 if (mddev->pers->quiesce == NULL) 3030 return -EINVAL; 3031 if (mddev->recovery || mddev->sync_thread) 3032 return -EBUSY; 3033 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 3034 /* add the bitmap */ 3035 if (mddev->bitmap) 3036 return -EEXIST; 3037 if (mddev->default_bitmap_offset == 0) 3038 return -EINVAL; 3039 mddev->bitmap_offset = mddev->default_bitmap_offset; 3040 mddev->pers->quiesce(mddev, 1); 3041 rv = bitmap_create(mddev); 3042 if (rv) 3043 bitmap_destroy(mddev); 3044 mddev->pers->quiesce(mddev, 0); 3045 } else { 3046 /* remove the bitmap */ 3047 if (!mddev->bitmap) 3048 return -ENOENT; 3049 if (mddev->bitmap->file) 3050 return -EINVAL; 3051 mddev->pers->quiesce(mddev, 1); 3052 bitmap_destroy(mddev); 3053 mddev->pers->quiesce(mddev, 0); 3054 mddev->bitmap_offset = 0; 3055 } 3056 } 3057 md_update_sb(mddev); 3058 return rv; 3059 } 3060 3061 static int set_disk_faulty(mddev_t *mddev, dev_t dev) 3062 { 3063 mdk_rdev_t *rdev; 3064 3065 if (mddev->pers == NULL) 3066 return -ENODEV; 3067 3068 rdev = find_rdev(mddev, dev); 3069 if (!rdev) 3070 return -ENODEV; 3071 3072 md_error(mddev, rdev); 3073 return 0; 3074 } 3075 3076 static int md_ioctl(struct inode *inode, struct file *file, 3077 unsigned int cmd, unsigned long arg) 3078 { 3079 int err = 0; 3080 void __user *argp = (void __user *)arg; 3081 struct hd_geometry __user *loc = argp; 3082 mddev_t *mddev = NULL; 3083 3084 if (!capable(CAP_SYS_ADMIN)) 3085 return -EACCES; 3086 3087 /* 3088 * Commands dealing with the RAID driver but not any 3089 * particular array: 3090 */ 3091 switch (cmd) 3092 { 3093 case RAID_VERSION: 3094 err = get_version(argp); 3095 goto done; 3096 3097 case PRINT_RAID_DEBUG: 3098 err = 0; 3099 md_print_devices(); 3100 goto done; 3101 3102 #ifndef MODULE 3103 case RAID_AUTORUN: 3104 err = 0; 3105 autostart_arrays(arg); 3106 goto done; 3107 #endif 3108 default:; 3109 } 3110 3111 /* 3112 * Commands creating/starting a new array: 3113 */ 3114 3115 mddev = inode->i_bdev->bd_disk->private_data; 3116 3117 if (!mddev) { 3118 BUG(); 3119 goto abort; 3120 } 3121 3122 3123 if (cmd == START_ARRAY) { 3124 /* START_ARRAY doesn't need to lock the array as autostart_array 3125 * does the locking, and it could even be a different array 3126 */ 3127 static int cnt = 3; 3128 if (cnt > 0 ) { 3129 printk(KERN_WARNING 3130 "md: %s(pid %d) used deprecated START_ARRAY ioctl. " 3131 "This will not be supported beyond 2.6\n", 3132 current->comm, current->pid); 3133 cnt--; 3134 } 3135 err = autostart_array(new_decode_dev(arg)); 3136 if (err) { 3137 printk(KERN_WARNING "md: autostart failed!\n"); 3138 goto abort; 3139 } 3140 goto done; 3141 } 3142 3143 err = mddev_lock(mddev); 3144 if (err) { 3145 printk(KERN_INFO 3146 "md: ioctl lock interrupted, reason %d, cmd %d\n", 3147 err, cmd); 3148 goto abort; 3149 } 3150 3151 switch (cmd) 3152 { 3153 case SET_ARRAY_INFO: 3154 { 3155 mdu_array_info_t info; 3156 if (!arg) 3157 memset(&info, 0, sizeof(info)); 3158 else if (copy_from_user(&info, argp, sizeof(info))) { 3159 err = -EFAULT; 3160 goto abort_unlock; 3161 } 3162 if (mddev->pers) { 3163 err = update_array_info(mddev, &info); 3164 if (err) { 3165 printk(KERN_WARNING "md: couldn't update" 3166 " array info. %d\n", err); 3167 goto abort_unlock; 3168 } 3169 goto done_unlock; 3170 } 3171 if (!list_empty(&mddev->disks)) { 3172 printk(KERN_WARNING 3173 "md: array %s already has disks!\n", 3174 mdname(mddev)); 3175 err = -EBUSY; 3176 goto abort_unlock; 3177 } 3178 if (mddev->raid_disks) { 3179 printk(KERN_WARNING 3180 "md: array %s already initialised!\n", 3181 mdname(mddev)); 3182 err = -EBUSY; 3183 goto abort_unlock; 3184 } 3185 err = set_array_info(mddev, &info); 3186 if (err) { 3187 printk(KERN_WARNING "md: couldn't set" 3188 " array info. %d\n", err); 3189 goto abort_unlock; 3190 } 3191 } 3192 goto done_unlock; 3193 3194 default:; 3195 } 3196 3197 /* 3198 * Commands querying/configuring an existing array: 3199 */ 3200 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 3201 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ 3202 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 3203 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { 3204 err = -ENODEV; 3205 goto abort_unlock; 3206 } 3207 3208 /* 3209 * Commands even a read-only array can execute: 3210 */ 3211 switch (cmd) 3212 { 3213 case GET_ARRAY_INFO: 3214 err = get_array_info(mddev, argp); 3215 goto done_unlock; 3216 3217 case GET_BITMAP_FILE: 3218 err = get_bitmap_file(mddev, argp); 3219 goto done_unlock; 3220 3221 case GET_DISK_INFO: 3222 err = get_disk_info(mddev, argp); 3223 goto done_unlock; 3224 3225 case RESTART_ARRAY_RW: 3226 err = restart_array(mddev); 3227 goto done_unlock; 3228 3229 case STOP_ARRAY: 3230 err = do_md_stop (mddev, 0); 3231 goto done_unlock; 3232 3233 case STOP_ARRAY_RO: 3234 err = do_md_stop (mddev, 1); 3235 goto done_unlock; 3236 3237 /* 3238 * We have a problem here : there is no easy way to give a CHS 3239 * virtual geometry. We currently pretend that we have a 2 heads 3240 * 4 sectors (with a BIG number of cylinders...). This drives 3241 * dosfs just mad... ;-) 3242 */ 3243 case HDIO_GETGEO: 3244 if (!loc) { 3245 err = -EINVAL; 3246 goto abort_unlock; 3247 } 3248 err = put_user (2, (char __user *) &loc->heads); 3249 if (err) 3250 goto abort_unlock; 3251 err = put_user (4, (char __user *) &loc->sectors); 3252 if (err) 3253 goto abort_unlock; 3254 err = put_user(get_capacity(mddev->gendisk)/8, 3255 (short __user *) &loc->cylinders); 3256 if (err) 3257 goto abort_unlock; 3258 err = put_user (get_start_sect(inode->i_bdev), 3259 (long __user *) &loc->start); 3260 goto done_unlock; 3261 } 3262 3263 /* 3264 * The remaining ioctls are changing the state of the 3265 * superblock, so we do not allow them on read-only arrays. 3266 * However non-MD ioctls (e.g. get-size) will still come through 3267 * here and hit the 'default' below, so only disallow 3268 * 'md' ioctls, and switch to rw mode if started auto-readonly. 3269 */ 3270 if (_IOC_TYPE(cmd) == MD_MAJOR && 3271 mddev->ro && mddev->pers) { 3272 if (mddev->ro == 2) { 3273 mddev->ro = 0; 3274 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3275 md_wakeup_thread(mddev->thread); 3276 3277 } else { 3278 err = -EROFS; 3279 goto abort_unlock; 3280 } 3281 } 3282 3283 switch (cmd) 3284 { 3285 case ADD_NEW_DISK: 3286 { 3287 mdu_disk_info_t info; 3288 if (copy_from_user(&info, argp, sizeof(info))) 3289 err = -EFAULT; 3290 else 3291 err = add_new_disk(mddev, &info); 3292 goto done_unlock; 3293 } 3294 3295 case HOT_REMOVE_DISK: 3296 err = hot_remove_disk(mddev, new_decode_dev(arg)); 3297 goto done_unlock; 3298 3299 case HOT_ADD_DISK: 3300 err = hot_add_disk(mddev, new_decode_dev(arg)); 3301 goto done_unlock; 3302 3303 case SET_DISK_FAULTY: 3304 err = set_disk_faulty(mddev, new_decode_dev(arg)); 3305 goto done_unlock; 3306 3307 case RUN_ARRAY: 3308 err = do_md_run (mddev); 3309 goto done_unlock; 3310 3311 case SET_BITMAP_FILE: 3312 err = set_bitmap_file(mddev, (int)arg); 3313 goto done_unlock; 3314 3315 default: 3316 if (_IOC_TYPE(cmd) == MD_MAJOR) 3317 printk(KERN_WARNING "md: %s(pid %d) used" 3318 " obsolete MD ioctl, upgrade your" 3319 " software to use new ictls.\n", 3320 current->comm, current->pid); 3321 err = -EINVAL; 3322 goto abort_unlock; 3323 } 3324 3325 done_unlock: 3326 abort_unlock: 3327 mddev_unlock(mddev); 3328 3329 return err; 3330 done: 3331 if (err) 3332 MD_BUG(); 3333 abort: 3334 return err; 3335 } 3336 3337 static int md_open(struct inode *inode, struct file *file) 3338 { 3339 /* 3340 * Succeed if we can lock the mddev, which confirms that 3341 * it isn't being stopped right now. 3342 */ 3343 mddev_t *mddev = inode->i_bdev->bd_disk->private_data; 3344 int err; 3345 3346 if ((err = mddev_lock(mddev))) 3347 goto out; 3348 3349 err = 0; 3350 mddev_get(mddev); 3351 mddev_unlock(mddev); 3352 3353 check_disk_change(inode->i_bdev); 3354 out: 3355 return err; 3356 } 3357 3358 static int md_release(struct inode *inode, struct file * file) 3359 { 3360 mddev_t *mddev = inode->i_bdev->bd_disk->private_data; 3361 3362 if (!mddev) 3363 BUG(); 3364 mddev_put(mddev); 3365 3366 return 0; 3367 } 3368 3369 static int md_media_changed(struct gendisk *disk) 3370 { 3371 mddev_t *mddev = disk->private_data; 3372 3373 return mddev->changed; 3374 } 3375 3376 static int md_revalidate(struct gendisk *disk) 3377 { 3378 mddev_t *mddev = disk->private_data; 3379 3380 mddev->changed = 0; 3381 return 0; 3382 } 3383 static struct block_device_operations md_fops = 3384 { 3385 .owner = THIS_MODULE, 3386 .open = md_open, 3387 .release = md_release, 3388 .ioctl = md_ioctl, 3389 .media_changed = md_media_changed, 3390 .revalidate_disk= md_revalidate, 3391 }; 3392 3393 static int md_thread(void * arg) 3394 { 3395 mdk_thread_t *thread = arg; 3396 3397 /* 3398 * md_thread is a 'system-thread', it's priority should be very 3399 * high. We avoid resource deadlocks individually in each 3400 * raid personality. (RAID5 does preallocation) We also use RR and 3401 * the very same RT priority as kswapd, thus we will never get 3402 * into a priority inversion deadlock. 3403 * 3404 * we definitely have to have equal or higher priority than 3405 * bdflush, otherwise bdflush will deadlock if there are too 3406 * many dirty RAID5 blocks. 3407 */ 3408 3409 allow_signal(SIGKILL); 3410 complete(thread->event); 3411 while (!kthread_should_stop()) { 3412 void (*run)(mddev_t *); 3413 3414 wait_event_interruptible_timeout(thread->wqueue, 3415 test_bit(THREAD_WAKEUP, &thread->flags) 3416 || kthread_should_stop(), 3417 thread->timeout); 3418 try_to_freeze(); 3419 3420 clear_bit(THREAD_WAKEUP, &thread->flags); 3421 3422 run = thread->run; 3423 if (run) 3424 run(thread->mddev); 3425 } 3426 3427 return 0; 3428 } 3429 3430 void md_wakeup_thread(mdk_thread_t *thread) 3431 { 3432 if (thread) { 3433 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); 3434 set_bit(THREAD_WAKEUP, &thread->flags); 3435 wake_up(&thread->wqueue); 3436 } 3437 } 3438 3439 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, 3440 const char *name) 3441 { 3442 mdk_thread_t *thread; 3443 struct completion event; 3444 3445 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL); 3446 if (!thread) 3447 return NULL; 3448 3449 memset(thread, 0, sizeof(mdk_thread_t)); 3450 init_waitqueue_head(&thread->wqueue); 3451 3452 init_completion(&event); 3453 thread->event = &event; 3454 thread->run = run; 3455 thread->mddev = mddev; 3456 thread->name = name; 3457 thread->timeout = MAX_SCHEDULE_TIMEOUT; 3458 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); 3459 if (IS_ERR(thread->tsk)) { 3460 kfree(thread); 3461 return NULL; 3462 } 3463 wait_for_completion(&event); 3464 return thread; 3465 } 3466 3467 void md_unregister_thread(mdk_thread_t *thread) 3468 { 3469 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); 3470 3471 kthread_stop(thread->tsk); 3472 kfree(thread); 3473 } 3474 3475 void md_error(mddev_t *mddev, mdk_rdev_t *rdev) 3476 { 3477 if (!mddev) { 3478 MD_BUG(); 3479 return; 3480 } 3481 3482 if (!rdev || test_bit(Faulty, &rdev->flags)) 3483 return; 3484 /* 3485 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", 3486 mdname(mddev), 3487 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), 3488 __builtin_return_address(0),__builtin_return_address(1), 3489 __builtin_return_address(2),__builtin_return_address(3)); 3490 */ 3491 if (!mddev->pers->error_handler) 3492 return; 3493 mddev->pers->error_handler(mddev,rdev); 3494 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 3495 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3496 md_wakeup_thread(mddev->thread); 3497 } 3498 3499 /* seq_file implementation /proc/mdstat */ 3500 3501 static void status_unused(struct seq_file *seq) 3502 { 3503 int i = 0; 3504 mdk_rdev_t *rdev; 3505 struct list_head *tmp; 3506 3507 seq_printf(seq, "unused devices: "); 3508 3509 ITERATE_RDEV_PENDING(rdev,tmp) { 3510 char b[BDEVNAME_SIZE]; 3511 i++; 3512 seq_printf(seq, "%s ", 3513 bdevname(rdev->bdev,b)); 3514 } 3515 if (!i) 3516 seq_printf(seq, "<none>"); 3517 3518 seq_printf(seq, "\n"); 3519 } 3520 3521 3522 static void status_resync(struct seq_file *seq, mddev_t * mddev) 3523 { 3524 unsigned long max_blocks, resync, res, dt, db, rt; 3525 3526 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; 3527 3528 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 3529 max_blocks = mddev->resync_max_sectors >> 1; 3530 else 3531 max_blocks = mddev->size; 3532 3533 /* 3534 * Should not happen. 3535 */ 3536 if (!max_blocks) { 3537 MD_BUG(); 3538 return; 3539 } 3540 res = (resync/1024)*1000/(max_blocks/1024 + 1); 3541 { 3542 int i, x = res/50, y = 20-x; 3543 seq_printf(seq, "["); 3544 for (i = 0; i < x; i++) 3545 seq_printf(seq, "="); 3546 seq_printf(seq, ">"); 3547 for (i = 0; i < y; i++) 3548 seq_printf(seq, "."); 3549 seq_printf(seq, "] "); 3550 } 3551 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", 3552 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 3553 "resync" : "recovery"), 3554 res/10, res % 10, resync, max_blocks); 3555 3556 /* 3557 * We do not want to overflow, so the order of operands and 3558 * the * 100 / 100 trick are important. We do a +1 to be 3559 * safe against division by zero. We only estimate anyway. 3560 * 3561 * dt: time from mark until now 3562 * db: blocks written from mark until now 3563 * rt: remaining time 3564 */ 3565 dt = ((jiffies - mddev->resync_mark) / HZ); 3566 if (!dt) dt++; 3567 db = resync - (mddev->resync_mark_cnt/2); 3568 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; 3569 3570 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); 3571 3572 seq_printf(seq, " speed=%ldK/sec", db/dt); 3573 } 3574 3575 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 3576 { 3577 struct list_head *tmp; 3578 loff_t l = *pos; 3579 mddev_t *mddev; 3580 3581 if (l >= 0x10000) 3582 return NULL; 3583 if (!l--) 3584 /* header */ 3585 return (void*)1; 3586 3587 spin_lock(&all_mddevs_lock); 3588 list_for_each(tmp,&all_mddevs) 3589 if (!l--) { 3590 mddev = list_entry(tmp, mddev_t, all_mddevs); 3591 mddev_get(mddev); 3592 spin_unlock(&all_mddevs_lock); 3593 return mddev; 3594 } 3595 spin_unlock(&all_mddevs_lock); 3596 if (!l--) 3597 return (void*)2;/* tail */ 3598 return NULL; 3599 } 3600 3601 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3602 { 3603 struct list_head *tmp; 3604 mddev_t *next_mddev, *mddev = v; 3605 3606 ++*pos; 3607 if (v == (void*)2) 3608 return NULL; 3609 3610 spin_lock(&all_mddevs_lock); 3611 if (v == (void*)1) 3612 tmp = all_mddevs.next; 3613 else 3614 tmp = mddev->all_mddevs.next; 3615 if (tmp != &all_mddevs) 3616 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); 3617 else { 3618 next_mddev = (void*)2; 3619 *pos = 0x10000; 3620 } 3621 spin_unlock(&all_mddevs_lock); 3622 3623 if (v != (void*)1) 3624 mddev_put(mddev); 3625 return next_mddev; 3626 3627 } 3628 3629 static void md_seq_stop(struct seq_file *seq, void *v) 3630 { 3631 mddev_t *mddev = v; 3632 3633 if (mddev && v != (void*)1 && v != (void*)2) 3634 mddev_put(mddev); 3635 } 3636 3637 static int md_seq_show(struct seq_file *seq, void *v) 3638 { 3639 mddev_t *mddev = v; 3640 sector_t size; 3641 struct list_head *tmp2; 3642 mdk_rdev_t *rdev; 3643 int i; 3644 struct bitmap *bitmap; 3645 3646 if (v == (void*)1) { 3647 seq_printf(seq, "Personalities : "); 3648 spin_lock(&pers_lock); 3649 for (i = 0; i < MAX_PERSONALITY; i++) 3650 if (pers[i]) 3651 seq_printf(seq, "[%s] ", pers[i]->name); 3652 3653 spin_unlock(&pers_lock); 3654 seq_printf(seq, "\n"); 3655 return 0; 3656 } 3657 if (v == (void*)2) { 3658 status_unused(seq); 3659 return 0; 3660 } 3661 3662 if (mddev_lock(mddev)!=0) 3663 return -EINTR; 3664 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 3665 seq_printf(seq, "%s : %sactive", mdname(mddev), 3666 mddev->pers ? "" : "in"); 3667 if (mddev->pers) { 3668 if (mddev->ro==1) 3669 seq_printf(seq, " (read-only)"); 3670 if (mddev->ro==2) 3671 seq_printf(seq, "(auto-read-only)"); 3672 seq_printf(seq, " %s", mddev->pers->name); 3673 } 3674 3675 size = 0; 3676 ITERATE_RDEV(mddev,rdev,tmp2) { 3677 char b[BDEVNAME_SIZE]; 3678 seq_printf(seq, " %s[%d]", 3679 bdevname(rdev->bdev,b), rdev->desc_nr); 3680 if (test_bit(WriteMostly, &rdev->flags)) 3681 seq_printf(seq, "(W)"); 3682 if (test_bit(Faulty, &rdev->flags)) { 3683 seq_printf(seq, "(F)"); 3684 continue; 3685 } else if (rdev->raid_disk < 0) 3686 seq_printf(seq, "(S)"); /* spare */ 3687 size += rdev->size; 3688 } 3689 3690 if (!list_empty(&mddev->disks)) { 3691 if (mddev->pers) 3692 seq_printf(seq, "\n %llu blocks", 3693 (unsigned long long)mddev->array_size); 3694 else 3695 seq_printf(seq, "\n %llu blocks", 3696 (unsigned long long)size); 3697 } 3698 if (mddev->persistent) { 3699 if (mddev->major_version != 0 || 3700 mddev->minor_version != 90) { 3701 seq_printf(seq," super %d.%d", 3702 mddev->major_version, 3703 mddev->minor_version); 3704 } 3705 } else 3706 seq_printf(seq, " super non-persistent"); 3707 3708 if (mddev->pers) { 3709 mddev->pers->status (seq, mddev); 3710 seq_printf(seq, "\n "); 3711 if (mddev->curr_resync > 2) { 3712 status_resync (seq, mddev); 3713 seq_printf(seq, "\n "); 3714 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) 3715 seq_printf(seq, "\tresync=DELAYED\n "); 3716 else if (mddev->recovery_cp < MaxSector) 3717 seq_printf(seq, "\tresync=PENDING\n "); 3718 } else 3719 seq_printf(seq, "\n "); 3720 3721 if ((bitmap = mddev->bitmap)) { 3722 unsigned long chunk_kb; 3723 unsigned long flags; 3724 spin_lock_irqsave(&bitmap->lock, flags); 3725 chunk_kb = bitmap->chunksize >> 10; 3726 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " 3727 "%lu%s chunk", 3728 bitmap->pages - bitmap->missing_pages, 3729 bitmap->pages, 3730 (bitmap->pages - bitmap->missing_pages) 3731 << (PAGE_SHIFT - 10), 3732 chunk_kb ? chunk_kb : bitmap->chunksize, 3733 chunk_kb ? "KB" : "B"); 3734 if (bitmap->file) { 3735 seq_printf(seq, ", file: "); 3736 seq_path(seq, bitmap->file->f_vfsmnt, 3737 bitmap->file->f_dentry," \t\n"); 3738 } 3739 3740 seq_printf(seq, "\n"); 3741 spin_unlock_irqrestore(&bitmap->lock, flags); 3742 } 3743 3744 seq_printf(seq, "\n"); 3745 } 3746 mddev_unlock(mddev); 3747 3748 return 0; 3749 } 3750 3751 static struct seq_operations md_seq_ops = { 3752 .start = md_seq_start, 3753 .next = md_seq_next, 3754 .stop = md_seq_stop, 3755 .show = md_seq_show, 3756 }; 3757 3758 static int md_seq_open(struct inode *inode, struct file *file) 3759 { 3760 int error; 3761 3762 error = seq_open(file, &md_seq_ops); 3763 return error; 3764 } 3765 3766 static struct file_operations md_seq_fops = { 3767 .open = md_seq_open, 3768 .read = seq_read, 3769 .llseek = seq_lseek, 3770 .release = seq_release, 3771 }; 3772 3773 int register_md_personality(int pnum, mdk_personality_t *p) 3774 { 3775 if (pnum >= MAX_PERSONALITY) { 3776 printk(KERN_ERR 3777 "md: tried to install personality %s as nr %d, but max is %lu\n", 3778 p->name, pnum, MAX_PERSONALITY-1); 3779 return -EINVAL; 3780 } 3781 3782 spin_lock(&pers_lock); 3783 if (pers[pnum]) { 3784 spin_unlock(&pers_lock); 3785 return -EBUSY; 3786 } 3787 3788 pers[pnum] = p; 3789 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum); 3790 spin_unlock(&pers_lock); 3791 return 0; 3792 } 3793 3794 int unregister_md_personality(int pnum) 3795 { 3796 if (pnum >= MAX_PERSONALITY) 3797 return -EINVAL; 3798 3799 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name); 3800 spin_lock(&pers_lock); 3801 pers[pnum] = NULL; 3802 spin_unlock(&pers_lock); 3803 return 0; 3804 } 3805 3806 static int is_mddev_idle(mddev_t *mddev) 3807 { 3808 mdk_rdev_t * rdev; 3809 struct list_head *tmp; 3810 int idle; 3811 unsigned long curr_events; 3812 3813 idle = 1; 3814 ITERATE_RDEV(mddev,rdev,tmp) { 3815 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 3816 curr_events = disk_stat_read(disk, sectors[0]) + 3817 disk_stat_read(disk, sectors[1]) - 3818 atomic_read(&disk->sync_io); 3819 /* Allow some slack between valud of curr_events and last_events, 3820 * as there are some uninteresting races. 3821 * Note: the following is an unsigned comparison. 3822 */ 3823 if ((curr_events - rdev->last_events + 32) > 64) { 3824 rdev->last_events = curr_events; 3825 idle = 0; 3826 } 3827 } 3828 return idle; 3829 } 3830 3831 void md_done_sync(mddev_t *mddev, int blocks, int ok) 3832 { 3833 /* another "blocks" (512byte) blocks have been synced */ 3834 atomic_sub(blocks, &mddev->recovery_active); 3835 wake_up(&mddev->recovery_wait); 3836 if (!ok) { 3837 set_bit(MD_RECOVERY_ERR, &mddev->recovery); 3838 md_wakeup_thread(mddev->thread); 3839 // stop recovery, signal do_sync .... 3840 } 3841 } 3842 3843 3844 /* md_write_start(mddev, bi) 3845 * If we need to update some array metadata (e.g. 'active' flag 3846 * in superblock) before writing, schedule a superblock update 3847 * and wait for it to complete. 3848 */ 3849 void md_write_start(mddev_t *mddev, struct bio *bi) 3850 { 3851 if (bio_data_dir(bi) != WRITE) 3852 return; 3853 3854 BUG_ON(mddev->ro == 1); 3855 if (mddev->ro == 2) { 3856 /* need to switch to read/write */ 3857 mddev->ro = 0; 3858 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3859 md_wakeup_thread(mddev->thread); 3860 } 3861 atomic_inc(&mddev->writes_pending); 3862 if (mddev->in_sync) { 3863 spin_lock_irq(&mddev->write_lock); 3864 if (mddev->in_sync) { 3865 mddev->in_sync = 0; 3866 mddev->sb_dirty = 1; 3867 md_wakeup_thread(mddev->thread); 3868 } 3869 spin_unlock_irq(&mddev->write_lock); 3870 } 3871 wait_event(mddev->sb_wait, mddev->sb_dirty==0); 3872 } 3873 3874 void md_write_end(mddev_t *mddev) 3875 { 3876 if (atomic_dec_and_test(&mddev->writes_pending)) { 3877 if (mddev->safemode == 2) 3878 md_wakeup_thread(mddev->thread); 3879 else 3880 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 3881 } 3882 } 3883 3884 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 3885 3886 #define SYNC_MARKS 10 3887 #define SYNC_MARK_STEP (3*HZ) 3888 static void md_do_sync(mddev_t *mddev) 3889 { 3890 mddev_t *mddev2; 3891 unsigned int currspeed = 0, 3892 window; 3893 sector_t max_sectors,j, io_sectors; 3894 unsigned long mark[SYNC_MARKS]; 3895 sector_t mark_cnt[SYNC_MARKS]; 3896 int last_mark,m; 3897 struct list_head *tmp; 3898 sector_t last_check; 3899 int skipped = 0; 3900 3901 /* just incase thread restarts... */ 3902 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 3903 return; 3904 3905 /* we overload curr_resync somewhat here. 3906 * 0 == not engaged in resync at all 3907 * 2 == checking that there is no conflict with another sync 3908 * 1 == like 2, but have yielded to allow conflicting resync to 3909 * commense 3910 * other == active in resync - this many blocks 3911 * 3912 * Before starting a resync we must have set curr_resync to 3913 * 2, and then checked that every "conflicting" array has curr_resync 3914 * less than ours. When we find one that is the same or higher 3915 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 3916 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 3917 * This will mean we have to start checking from the beginning again. 3918 * 3919 */ 3920 3921 do { 3922 mddev->curr_resync = 2; 3923 3924 try_again: 3925 if (signal_pending(current) || 3926 kthread_should_stop()) { 3927 flush_signals(current); 3928 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 3929 goto skip; 3930 } 3931 ITERATE_MDDEV(mddev2,tmp) { 3932 if (mddev2 == mddev) 3933 continue; 3934 if (mddev2->curr_resync && 3935 match_mddev_units(mddev,mddev2)) { 3936 DEFINE_WAIT(wq); 3937 if (mddev < mddev2 && mddev->curr_resync == 2) { 3938 /* arbitrarily yield */ 3939 mddev->curr_resync = 1; 3940 wake_up(&resync_wait); 3941 } 3942 if (mddev > mddev2 && mddev->curr_resync == 1) 3943 /* no need to wait here, we can wait the next 3944 * time 'round when curr_resync == 2 3945 */ 3946 continue; 3947 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); 3948 if (!signal_pending(current) && 3949 !kthread_should_stop() && 3950 mddev2->curr_resync >= mddev->curr_resync) { 3951 printk(KERN_INFO "md: delaying resync of %s" 3952 " until %s has finished resync (they" 3953 " share one or more physical units)\n", 3954 mdname(mddev), mdname(mddev2)); 3955 mddev_put(mddev2); 3956 schedule(); 3957 finish_wait(&resync_wait, &wq); 3958 goto try_again; 3959 } 3960 finish_wait(&resync_wait, &wq); 3961 } 3962 } 3963 } while (mddev->curr_resync < 2); 3964 3965 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 3966 /* resync follows the size requested by the personality, 3967 * which defaults to physical size, but can be virtual size 3968 */ 3969 max_sectors = mddev->resync_max_sectors; 3970 mddev->resync_mismatches = 0; 3971 } else 3972 /* recovery follows the physical size of devices */ 3973 max_sectors = mddev->size << 1; 3974 3975 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); 3976 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" 3977 " %d KB/sec/disc.\n", sysctl_speed_limit_min); 3978 printk(KERN_INFO "md: using maximum available idle IO bandwidth " 3979 "(but not more than %d KB/sec) for reconstruction.\n", 3980 sysctl_speed_limit_max); 3981 3982 is_mddev_idle(mddev); /* this also initializes IO event counters */ 3983 /* we don't use the checkpoint if there's a bitmap */ 3984 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap 3985 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 3986 j = mddev->recovery_cp; 3987 else 3988 j = 0; 3989 io_sectors = 0; 3990 for (m = 0; m < SYNC_MARKS; m++) { 3991 mark[m] = jiffies; 3992 mark_cnt[m] = io_sectors; 3993 } 3994 last_mark = 0; 3995 mddev->resync_mark = mark[last_mark]; 3996 mddev->resync_mark_cnt = mark_cnt[last_mark]; 3997 3998 /* 3999 * Tune reconstruction: 4000 */ 4001 window = 32*(PAGE_SIZE/512); 4002 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", 4003 window/2,(unsigned long long) max_sectors/2); 4004 4005 atomic_set(&mddev->recovery_active, 0); 4006 init_waitqueue_head(&mddev->recovery_wait); 4007 last_check = 0; 4008 4009 if (j>2) { 4010 printk(KERN_INFO 4011 "md: resuming recovery of %s from checkpoint.\n", 4012 mdname(mddev)); 4013 mddev->curr_resync = j; 4014 } 4015 4016 while (j < max_sectors) { 4017 sector_t sectors; 4018 4019 skipped = 0; 4020 sectors = mddev->pers->sync_request(mddev, j, &skipped, 4021 currspeed < sysctl_speed_limit_min); 4022 if (sectors == 0) { 4023 set_bit(MD_RECOVERY_ERR, &mddev->recovery); 4024 goto out; 4025 } 4026 4027 if (!skipped) { /* actual IO requested */ 4028 io_sectors += sectors; 4029 atomic_add(sectors, &mddev->recovery_active); 4030 } 4031 4032 j += sectors; 4033 if (j>1) mddev->curr_resync = j; 4034 4035 4036 if (last_check + window > io_sectors || j == max_sectors) 4037 continue; 4038 4039 last_check = io_sectors; 4040 4041 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || 4042 test_bit(MD_RECOVERY_ERR, &mddev->recovery)) 4043 break; 4044 4045 repeat: 4046 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 4047 /* step marks */ 4048 int next = (last_mark+1) % SYNC_MARKS; 4049 4050 mddev->resync_mark = mark[next]; 4051 mddev->resync_mark_cnt = mark_cnt[next]; 4052 mark[next] = jiffies; 4053 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 4054 last_mark = next; 4055 } 4056 4057 4058 if (signal_pending(current) || kthread_should_stop()) { 4059 /* 4060 * got a signal, exit. 4061 */ 4062 printk(KERN_INFO 4063 "md: md_do_sync() got signal ... exiting\n"); 4064 flush_signals(current); 4065 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4066 goto out; 4067 } 4068 4069 /* 4070 * this loop exits only if either when we are slower than 4071 * the 'hard' speed limit, or the system was IO-idle for 4072 * a jiffy. 4073 * the system might be non-idle CPU-wise, but we only care 4074 * about not overloading the IO subsystem. (things like an 4075 * e2fsck being done on the RAID array should execute fast) 4076 */ 4077 mddev->queue->unplug_fn(mddev->queue); 4078 cond_resched(); 4079 4080 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 4081 /((jiffies-mddev->resync_mark)/HZ +1) +1; 4082 4083 if (currspeed > sysctl_speed_limit_min) { 4084 if ((currspeed > sysctl_speed_limit_max) || 4085 !is_mddev_idle(mddev)) { 4086 msleep_interruptible(250); 4087 goto repeat; 4088 } 4089 } 4090 } 4091 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); 4092 /* 4093 * this also signals 'finished resyncing' to md_stop 4094 */ 4095 out: 4096 mddev->queue->unplug_fn(mddev->queue); 4097 4098 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 4099 4100 /* tell personality that we are finished */ 4101 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); 4102 4103 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && 4104 mddev->curr_resync > 2 && 4105 mddev->curr_resync >= mddev->recovery_cp) { 4106 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 4107 printk(KERN_INFO 4108 "md: checkpointing recovery of %s.\n", 4109 mdname(mddev)); 4110 mddev->recovery_cp = mddev->curr_resync; 4111 } else 4112 mddev->recovery_cp = MaxSector; 4113 } 4114 4115 skip: 4116 mddev->curr_resync = 0; 4117 wake_up(&resync_wait); 4118 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 4119 md_wakeup_thread(mddev->thread); 4120 } 4121 4122 4123 /* 4124 * This routine is regularly called by all per-raid-array threads to 4125 * deal with generic issues like resync and super-block update. 4126 * Raid personalities that don't have a thread (linear/raid0) do not 4127 * need this as they never do any recovery or update the superblock. 4128 * 4129 * It does not do any resync itself, but rather "forks" off other threads 4130 * to do that as needed. 4131 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 4132 * "->recovery" and create a thread at ->sync_thread. 4133 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) 4134 * and wakeups up this thread which will reap the thread and finish up. 4135 * This thread also removes any faulty devices (with nr_pending == 0). 4136 * 4137 * The overall approach is: 4138 * 1/ if the superblock needs updating, update it. 4139 * 2/ If a recovery thread is running, don't do anything else. 4140 * 3/ If recovery has finished, clean up, possibly marking spares active. 4141 * 4/ If there are any faulty devices, remove them. 4142 * 5/ If array is degraded, try to add spares devices 4143 * 6/ If array has spares or is not in-sync, start a resync thread. 4144 */ 4145 void md_check_recovery(mddev_t *mddev) 4146 { 4147 mdk_rdev_t *rdev; 4148 struct list_head *rtmp; 4149 4150 4151 if (mddev->bitmap) 4152 bitmap_daemon_work(mddev->bitmap); 4153 4154 if (mddev->ro) 4155 return; 4156 4157 if (signal_pending(current)) { 4158 if (mddev->pers->sync_request) { 4159 printk(KERN_INFO "md: %s in immediate safe mode\n", 4160 mdname(mddev)); 4161 mddev->safemode = 2; 4162 } 4163 flush_signals(current); 4164 } 4165 4166 if ( ! ( 4167 mddev->sb_dirty || 4168 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 4169 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 4170 (mddev->safemode == 1) || 4171 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 4172 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 4173 )) 4174 return; 4175 4176 if (mddev_trylock(mddev)==0) { 4177 int spares =0; 4178 4179 spin_lock_irq(&mddev->write_lock); 4180 if (mddev->safemode && !atomic_read(&mddev->writes_pending) && 4181 !mddev->in_sync && mddev->recovery_cp == MaxSector) { 4182 mddev->in_sync = 1; 4183 mddev->sb_dirty = 1; 4184 } 4185 if (mddev->safemode == 1) 4186 mddev->safemode = 0; 4187 spin_unlock_irq(&mddev->write_lock); 4188 4189 if (mddev->sb_dirty) 4190 md_update_sb(mddev); 4191 4192 4193 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 4194 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 4195 /* resync/recovery still happening */ 4196 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4197 goto unlock; 4198 } 4199 if (mddev->sync_thread) { 4200 /* resync has finished, collect result */ 4201 md_unregister_thread(mddev->sync_thread); 4202 mddev->sync_thread = NULL; 4203 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && 4204 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 4205 /* success...*/ 4206 /* activate any spares */ 4207 mddev->pers->spare_active(mddev); 4208 } 4209 md_update_sb(mddev); 4210 4211 /* if array is no-longer degraded, then any saved_raid_disk 4212 * information must be scrapped 4213 */ 4214 if (!mddev->degraded) 4215 ITERATE_RDEV(mddev,rdev,rtmp) 4216 rdev->saved_raid_disk = -1; 4217 4218 mddev->recovery = 0; 4219 /* flag recovery needed just to double check */ 4220 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4221 goto unlock; 4222 } 4223 /* Clear some bits that don't mean anything, but 4224 * might be left set 4225 */ 4226 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4227 clear_bit(MD_RECOVERY_ERR, &mddev->recovery); 4228 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 4229 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 4230 4231 /* no recovery is running. 4232 * remove any failed drives, then 4233 * add spares if possible. 4234 * Spare are also removed and re-added, to allow 4235 * the personality to fail the re-add. 4236 */ 4237 ITERATE_RDEV(mddev,rdev,rtmp) 4238 if (rdev->raid_disk >= 0 && 4239 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && 4240 atomic_read(&rdev->nr_pending)==0) { 4241 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { 4242 char nm[20]; 4243 sprintf(nm,"rd%d", rdev->raid_disk); 4244 sysfs_remove_link(&mddev->kobj, nm); 4245 rdev->raid_disk = -1; 4246 } 4247 } 4248 4249 if (mddev->degraded) { 4250 ITERATE_RDEV(mddev,rdev,rtmp) 4251 if (rdev->raid_disk < 0 4252 && !test_bit(Faulty, &rdev->flags)) { 4253 if (mddev->pers->hot_add_disk(mddev,rdev)) { 4254 char nm[20]; 4255 sprintf(nm, "rd%d", rdev->raid_disk); 4256 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 4257 spares++; 4258 } else 4259 break; 4260 } 4261 } 4262 4263 if (spares) { 4264 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4265 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4266 } else if (mddev->recovery_cp < MaxSector) { 4267 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4268 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 4269 /* nothing to be done ... */ 4270 goto unlock; 4271 4272 if (mddev->pers->sync_request) { 4273 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 4274 if (spares && mddev->bitmap && ! mddev->bitmap->file) { 4275 /* We are adding a device or devices to an array 4276 * which has the bitmap stored on all devices. 4277 * So make sure all bitmap pages get written 4278 */ 4279 bitmap_write_all(mddev->bitmap); 4280 } 4281 mddev->sync_thread = md_register_thread(md_do_sync, 4282 mddev, 4283 "%s_resync"); 4284 if (!mddev->sync_thread) { 4285 printk(KERN_ERR "%s: could not start resync" 4286 " thread...\n", 4287 mdname(mddev)); 4288 /* leave the spares where they are, it shouldn't hurt */ 4289 mddev->recovery = 0; 4290 } else { 4291 md_wakeup_thread(mddev->sync_thread); 4292 } 4293 } 4294 unlock: 4295 mddev_unlock(mddev); 4296 } 4297 } 4298 4299 static int md_notify_reboot(struct notifier_block *this, 4300 unsigned long code, void *x) 4301 { 4302 struct list_head *tmp; 4303 mddev_t *mddev; 4304 4305 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { 4306 4307 printk(KERN_INFO "md: stopping all md devices.\n"); 4308 4309 ITERATE_MDDEV(mddev,tmp) 4310 if (mddev_trylock(mddev)==0) 4311 do_md_stop (mddev, 1); 4312 /* 4313 * certain more exotic SCSI devices are known to be 4314 * volatile wrt too early system reboots. While the 4315 * right place to handle this issue is the given 4316 * driver, we do want to have a safe RAID driver ... 4317 */ 4318 mdelay(1000*1); 4319 } 4320 return NOTIFY_DONE; 4321 } 4322 4323 static struct notifier_block md_notifier = { 4324 .notifier_call = md_notify_reboot, 4325 .next = NULL, 4326 .priority = INT_MAX, /* before any real devices */ 4327 }; 4328 4329 static void md_geninit(void) 4330 { 4331 struct proc_dir_entry *p; 4332 4333 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 4334 4335 p = create_proc_entry("mdstat", S_IRUGO, NULL); 4336 if (p) 4337 p->proc_fops = &md_seq_fops; 4338 } 4339 4340 static int __init md_init(void) 4341 { 4342 int minor; 4343 4344 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," 4345 " MD_SB_DISKS=%d\n", 4346 MD_MAJOR_VERSION, MD_MINOR_VERSION, 4347 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); 4348 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, 4349 BITMAP_MINOR); 4350 4351 if (register_blkdev(MAJOR_NR, "md")) 4352 return -1; 4353 if ((mdp_major=register_blkdev(0, "mdp"))<=0) { 4354 unregister_blkdev(MAJOR_NR, "md"); 4355 return -1; 4356 } 4357 devfs_mk_dir("md"); 4358 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, 4359 md_probe, NULL, NULL); 4360 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, 4361 md_probe, NULL, NULL); 4362 4363 for (minor=0; minor < MAX_MD_DEVS; ++minor) 4364 devfs_mk_bdev(MKDEV(MAJOR_NR, minor), 4365 S_IFBLK|S_IRUSR|S_IWUSR, 4366 "md/%d", minor); 4367 4368 for (minor=0; minor < MAX_MD_DEVS; ++minor) 4369 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), 4370 S_IFBLK|S_IRUSR|S_IWUSR, 4371 "md/mdp%d", minor); 4372 4373 4374 register_reboot_notifier(&md_notifier); 4375 raid_table_header = register_sysctl_table(raid_root_table, 1); 4376 4377 md_geninit(); 4378 return (0); 4379 } 4380 4381 4382 #ifndef MODULE 4383 4384 /* 4385 * Searches all registered partitions for autorun RAID arrays 4386 * at boot time. 4387 */ 4388 static dev_t detected_devices[128]; 4389 static int dev_cnt; 4390 4391 void md_autodetect_dev(dev_t dev) 4392 { 4393 if (dev_cnt >= 0 && dev_cnt < 127) 4394 detected_devices[dev_cnt++] = dev; 4395 } 4396 4397 4398 static void autostart_arrays(int part) 4399 { 4400 mdk_rdev_t *rdev; 4401 int i; 4402 4403 printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); 4404 4405 for (i = 0; i < dev_cnt; i++) { 4406 dev_t dev = detected_devices[i]; 4407 4408 rdev = md_import_device(dev,0, 0); 4409 if (IS_ERR(rdev)) 4410 continue; 4411 4412 if (test_bit(Faulty, &rdev->flags)) { 4413 MD_BUG(); 4414 continue; 4415 } 4416 list_add(&rdev->same_set, &pending_raid_disks); 4417 } 4418 dev_cnt = 0; 4419 4420 autorun_devices(part); 4421 } 4422 4423 #endif 4424 4425 static __exit void md_exit(void) 4426 { 4427 mddev_t *mddev; 4428 struct list_head *tmp; 4429 int i; 4430 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); 4431 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); 4432 for (i=0; i < MAX_MD_DEVS; i++) 4433 devfs_remove("md/%d", i); 4434 for (i=0; i < MAX_MD_DEVS; i++) 4435 devfs_remove("md/d%d", i); 4436 4437 devfs_remove("md"); 4438 4439 unregister_blkdev(MAJOR_NR,"md"); 4440 unregister_blkdev(mdp_major, "mdp"); 4441 unregister_reboot_notifier(&md_notifier); 4442 unregister_sysctl_table(raid_table_header); 4443 remove_proc_entry("mdstat", NULL); 4444 ITERATE_MDDEV(mddev,tmp) { 4445 struct gendisk *disk = mddev->gendisk; 4446 if (!disk) 4447 continue; 4448 export_array(mddev); 4449 del_gendisk(disk); 4450 put_disk(disk); 4451 mddev->gendisk = NULL; 4452 mddev_put(mddev); 4453 } 4454 } 4455 4456 module_init(md_init) 4457 module_exit(md_exit) 4458 4459 static int get_ro(char *buffer, struct kernel_param *kp) 4460 { 4461 return sprintf(buffer, "%d", start_readonly); 4462 } 4463 static int set_ro(const char *val, struct kernel_param *kp) 4464 { 4465 char *e; 4466 int num = simple_strtoul(val, &e, 10); 4467 if (*val && (*e == '\0' || *e == '\n')) { 4468 start_readonly = num; 4469 return 0;; 4470 } 4471 return -EINVAL; 4472 } 4473 4474 module_param_call(start_ro, set_ro, get_ro, NULL, 0600); 4475 4476 EXPORT_SYMBOL(register_md_personality); 4477 EXPORT_SYMBOL(unregister_md_personality); 4478 EXPORT_SYMBOL(md_error); 4479 EXPORT_SYMBOL(md_done_sync); 4480 EXPORT_SYMBOL(md_write_start); 4481 EXPORT_SYMBOL(md_write_end); 4482 EXPORT_SYMBOL(md_register_thread); 4483 EXPORT_SYMBOL(md_unregister_thread); 4484 EXPORT_SYMBOL(md_wakeup_thread); 4485 EXPORT_SYMBOL(md_print_devices); 4486 EXPORT_SYMBOL(md_check_recovery); 4487 MODULE_LICENSE("GPL"); 4488 MODULE_ALIAS("md"); 4489 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 4490