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 #include <linux/poll.h> 46 47 #include <linux/init.h> 48 49 #include <linux/file.h> 50 51 #ifdef CONFIG_KMOD 52 #include <linux/kmod.h> 53 #endif 54 55 #include <asm/unaligned.h> 56 57 #define MAJOR_NR MD_MAJOR 58 #define MD_DRIVER 59 60 /* 63 partitions with the alternate major number (mdp) */ 61 #define MdpMinorShift 6 62 63 #define DEBUG 0 64 #define dprintk(x...) ((void)(DEBUG && printk(x))) 65 66 67 #ifndef MODULE 68 static void autostart_arrays (int part); 69 #endif 70 71 static mdk_personality_t *pers[MAX_PERSONALITY]; 72 static DEFINE_SPINLOCK(pers_lock); 73 74 /* 75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 76 * is 1000 KB/sec, so the extra system load does not show up that much. 77 * Increase it if you want to have more _guaranteed_ speed. Note that 78 * the RAID driver will use the maximum available bandwidth if the IO 79 * subsystem is idle. There is also an 'absolute maximum' reconstruction 80 * speed limit - in case reconstruction slows down your system despite 81 * idle IO detection. 82 * 83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 84 */ 85 86 static int sysctl_speed_limit_min = 1000; 87 static int sysctl_speed_limit_max = 200000; 88 89 static struct ctl_table_header *raid_table_header; 90 91 static ctl_table raid_table[] = { 92 { 93 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, 94 .procname = "speed_limit_min", 95 .data = &sysctl_speed_limit_min, 96 .maxlen = sizeof(int), 97 .mode = 0644, 98 .proc_handler = &proc_dointvec, 99 }, 100 { 101 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, 102 .procname = "speed_limit_max", 103 .data = &sysctl_speed_limit_max, 104 .maxlen = sizeof(int), 105 .mode = 0644, 106 .proc_handler = &proc_dointvec, 107 }, 108 { .ctl_name = 0 } 109 }; 110 111 static ctl_table raid_dir_table[] = { 112 { 113 .ctl_name = DEV_RAID, 114 .procname = "raid", 115 .maxlen = 0, 116 .mode = 0555, 117 .child = raid_table, 118 }, 119 { .ctl_name = 0 } 120 }; 121 122 static ctl_table raid_root_table[] = { 123 { 124 .ctl_name = CTL_DEV, 125 .procname = "dev", 126 .maxlen = 0, 127 .mode = 0555, 128 .child = raid_dir_table, 129 }, 130 { .ctl_name = 0 } 131 }; 132 133 static struct block_device_operations md_fops; 134 135 static int start_readonly; 136 137 /* 138 * We have a system wide 'event count' that is incremented 139 * on any 'interesting' event, and readers of /proc/mdstat 140 * can use 'poll' or 'select' to find out when the event 141 * count increases. 142 * 143 * Events are: 144 * start array, stop array, error, add device, remove device, 145 * start build, activate spare 146 */ 147 DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); 148 static atomic_t md_event_count; 149 void md_new_event(mddev_t *mddev) 150 { 151 atomic_inc(&md_event_count); 152 wake_up(&md_event_waiters); 153 } 154 155 /* 156 * Enables to iterate over all existing md arrays 157 * all_mddevs_lock protects this list. 158 */ 159 static LIST_HEAD(all_mddevs); 160 static DEFINE_SPINLOCK(all_mddevs_lock); 161 162 163 /* 164 * iterates through all used mddevs in the system. 165 * We take care to grab the all_mddevs_lock whenever navigating 166 * the list, and to always hold a refcount when unlocked. 167 * Any code which breaks out of this loop while own 168 * a reference to the current mddev and must mddev_put it. 169 */ 170 #define ITERATE_MDDEV(mddev,tmp) \ 171 \ 172 for (({ spin_lock(&all_mddevs_lock); \ 173 tmp = all_mddevs.next; \ 174 mddev = NULL;}); \ 175 ({ if (tmp != &all_mddevs) \ 176 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ 177 spin_unlock(&all_mddevs_lock); \ 178 if (mddev) mddev_put(mddev); \ 179 mddev = list_entry(tmp, mddev_t, all_mddevs); \ 180 tmp != &all_mddevs;}); \ 181 ({ spin_lock(&all_mddevs_lock); \ 182 tmp = tmp->next;}) \ 183 ) 184 185 186 static int md_fail_request (request_queue_t *q, struct bio *bio) 187 { 188 bio_io_error(bio, bio->bi_size); 189 return 0; 190 } 191 192 static inline mddev_t *mddev_get(mddev_t *mddev) 193 { 194 atomic_inc(&mddev->active); 195 return mddev; 196 } 197 198 static void mddev_put(mddev_t *mddev) 199 { 200 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 201 return; 202 if (!mddev->raid_disks && list_empty(&mddev->disks)) { 203 list_del(&mddev->all_mddevs); 204 blk_put_queue(mddev->queue); 205 kobject_unregister(&mddev->kobj); 206 } 207 spin_unlock(&all_mddevs_lock); 208 } 209 210 static mddev_t * mddev_find(dev_t unit) 211 { 212 mddev_t *mddev, *new = NULL; 213 214 retry: 215 spin_lock(&all_mddevs_lock); 216 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 217 if (mddev->unit == unit) { 218 mddev_get(mddev); 219 spin_unlock(&all_mddevs_lock); 220 kfree(new); 221 return mddev; 222 } 223 224 if (new) { 225 list_add(&new->all_mddevs, &all_mddevs); 226 spin_unlock(&all_mddevs_lock); 227 return new; 228 } 229 spin_unlock(&all_mddevs_lock); 230 231 new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL); 232 if (!new) 233 return NULL; 234 235 memset(new, 0, sizeof(*new)); 236 237 new->unit = unit; 238 if (MAJOR(unit) == MD_MAJOR) 239 new->md_minor = MINOR(unit); 240 else 241 new->md_minor = MINOR(unit) >> MdpMinorShift; 242 243 init_MUTEX(&new->reconfig_sem); 244 INIT_LIST_HEAD(&new->disks); 245 INIT_LIST_HEAD(&new->all_mddevs); 246 init_timer(&new->safemode_timer); 247 atomic_set(&new->active, 1); 248 spin_lock_init(&new->write_lock); 249 init_waitqueue_head(&new->sb_wait); 250 251 new->queue = blk_alloc_queue(GFP_KERNEL); 252 if (!new->queue) { 253 kfree(new); 254 return NULL; 255 } 256 257 blk_queue_make_request(new->queue, md_fail_request); 258 259 goto retry; 260 } 261 262 static inline int mddev_lock(mddev_t * mddev) 263 { 264 return down_interruptible(&mddev->reconfig_sem); 265 } 266 267 static inline void mddev_lock_uninterruptible(mddev_t * mddev) 268 { 269 down(&mddev->reconfig_sem); 270 } 271 272 static inline int mddev_trylock(mddev_t * mddev) 273 { 274 return down_trylock(&mddev->reconfig_sem); 275 } 276 277 static inline void mddev_unlock(mddev_t * mddev) 278 { 279 up(&mddev->reconfig_sem); 280 281 md_wakeup_thread(mddev->thread); 282 } 283 284 mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) 285 { 286 mdk_rdev_t * rdev; 287 struct list_head *tmp; 288 289 ITERATE_RDEV(mddev,rdev,tmp) { 290 if (rdev->desc_nr == nr) 291 return rdev; 292 } 293 return NULL; 294 } 295 296 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) 297 { 298 struct list_head *tmp; 299 mdk_rdev_t *rdev; 300 301 ITERATE_RDEV(mddev,rdev,tmp) { 302 if (rdev->bdev->bd_dev == dev) 303 return rdev; 304 } 305 return NULL; 306 } 307 308 static inline sector_t calc_dev_sboffset(struct block_device *bdev) 309 { 310 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 311 return MD_NEW_SIZE_BLOCKS(size); 312 } 313 314 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) 315 { 316 sector_t size; 317 318 size = rdev->sb_offset; 319 320 if (chunk_size) 321 size &= ~((sector_t)chunk_size/1024 - 1); 322 return size; 323 } 324 325 static int alloc_disk_sb(mdk_rdev_t * rdev) 326 { 327 if (rdev->sb_page) 328 MD_BUG(); 329 330 rdev->sb_page = alloc_page(GFP_KERNEL); 331 if (!rdev->sb_page) { 332 printk(KERN_ALERT "md: out of memory.\n"); 333 return -EINVAL; 334 } 335 336 return 0; 337 } 338 339 static void free_disk_sb(mdk_rdev_t * rdev) 340 { 341 if (rdev->sb_page) { 342 page_cache_release(rdev->sb_page); 343 rdev->sb_loaded = 0; 344 rdev->sb_page = NULL; 345 rdev->sb_offset = 0; 346 rdev->size = 0; 347 } 348 } 349 350 351 static int super_written(struct bio *bio, unsigned int bytes_done, int error) 352 { 353 mdk_rdev_t *rdev = bio->bi_private; 354 mddev_t *mddev = rdev->mddev; 355 if (bio->bi_size) 356 return 1; 357 358 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) 359 md_error(mddev, rdev); 360 361 if (atomic_dec_and_test(&mddev->pending_writes)) 362 wake_up(&mddev->sb_wait); 363 bio_put(bio); 364 return 0; 365 } 366 367 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) 368 { 369 struct bio *bio2 = bio->bi_private; 370 mdk_rdev_t *rdev = bio2->bi_private; 371 mddev_t *mddev = rdev->mddev; 372 if (bio->bi_size) 373 return 1; 374 375 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && 376 error == -EOPNOTSUPP) { 377 unsigned long flags; 378 /* barriers don't appear to be supported :-( */ 379 set_bit(BarriersNotsupp, &rdev->flags); 380 mddev->barriers_work = 0; 381 spin_lock_irqsave(&mddev->write_lock, flags); 382 bio2->bi_next = mddev->biolist; 383 mddev->biolist = bio2; 384 spin_unlock_irqrestore(&mddev->write_lock, flags); 385 wake_up(&mddev->sb_wait); 386 bio_put(bio); 387 return 0; 388 } 389 bio_put(bio2); 390 bio->bi_private = rdev; 391 return super_written(bio, bytes_done, error); 392 } 393 394 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, 395 sector_t sector, int size, struct page *page) 396 { 397 /* write first size bytes of page to sector of rdev 398 * Increment mddev->pending_writes before returning 399 * and decrement it on completion, waking up sb_wait 400 * if zero is reached. 401 * If an error occurred, call md_error 402 * 403 * As we might need to resubmit the request if BIO_RW_BARRIER 404 * causes ENOTSUPP, we allocate a spare bio... 405 */ 406 struct bio *bio = bio_alloc(GFP_NOIO, 1); 407 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); 408 409 bio->bi_bdev = rdev->bdev; 410 bio->bi_sector = sector; 411 bio_add_page(bio, page, size, 0); 412 bio->bi_private = rdev; 413 bio->bi_end_io = super_written; 414 bio->bi_rw = rw; 415 416 atomic_inc(&mddev->pending_writes); 417 if (!test_bit(BarriersNotsupp, &rdev->flags)) { 418 struct bio *rbio; 419 rw |= (1<<BIO_RW_BARRIER); 420 rbio = bio_clone(bio, GFP_NOIO); 421 rbio->bi_private = bio; 422 rbio->bi_end_io = super_written_barrier; 423 submit_bio(rw, rbio); 424 } else 425 submit_bio(rw, bio); 426 } 427 428 void md_super_wait(mddev_t *mddev) 429 { 430 /* wait for all superblock writes that were scheduled to complete. 431 * if any had to be retried (due to BARRIER problems), retry them 432 */ 433 DEFINE_WAIT(wq); 434 for(;;) { 435 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); 436 if (atomic_read(&mddev->pending_writes)==0) 437 break; 438 while (mddev->biolist) { 439 struct bio *bio; 440 spin_lock_irq(&mddev->write_lock); 441 bio = mddev->biolist; 442 mddev->biolist = bio->bi_next ; 443 bio->bi_next = NULL; 444 spin_unlock_irq(&mddev->write_lock); 445 submit_bio(bio->bi_rw, bio); 446 } 447 schedule(); 448 } 449 finish_wait(&mddev->sb_wait, &wq); 450 } 451 452 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) 453 { 454 if (bio->bi_size) 455 return 1; 456 457 complete((struct completion*)bio->bi_private); 458 return 0; 459 } 460 461 int sync_page_io(struct block_device *bdev, sector_t sector, int size, 462 struct page *page, int rw) 463 { 464 struct bio *bio = bio_alloc(GFP_NOIO, 1); 465 struct completion event; 466 int ret; 467 468 rw |= (1 << BIO_RW_SYNC); 469 470 bio->bi_bdev = bdev; 471 bio->bi_sector = sector; 472 bio_add_page(bio, page, size, 0); 473 init_completion(&event); 474 bio->bi_private = &event; 475 bio->bi_end_io = bi_complete; 476 submit_bio(rw, bio); 477 wait_for_completion(&event); 478 479 ret = test_bit(BIO_UPTODATE, &bio->bi_flags); 480 bio_put(bio); 481 return ret; 482 } 483 EXPORT_SYMBOL(sync_page_io); 484 485 static int read_disk_sb(mdk_rdev_t * rdev, int size) 486 { 487 char b[BDEVNAME_SIZE]; 488 if (!rdev->sb_page) { 489 MD_BUG(); 490 return -EINVAL; 491 } 492 if (rdev->sb_loaded) 493 return 0; 494 495 496 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) 497 goto fail; 498 rdev->sb_loaded = 1; 499 return 0; 500 501 fail: 502 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", 503 bdevname(rdev->bdev,b)); 504 return -EINVAL; 505 } 506 507 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 508 { 509 if ( (sb1->set_uuid0 == sb2->set_uuid0) && 510 (sb1->set_uuid1 == sb2->set_uuid1) && 511 (sb1->set_uuid2 == sb2->set_uuid2) && 512 (sb1->set_uuid3 == sb2->set_uuid3)) 513 514 return 1; 515 516 return 0; 517 } 518 519 520 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 521 { 522 int ret; 523 mdp_super_t *tmp1, *tmp2; 524 525 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 526 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 527 528 if (!tmp1 || !tmp2) { 529 ret = 0; 530 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); 531 goto abort; 532 } 533 534 *tmp1 = *sb1; 535 *tmp2 = *sb2; 536 537 /* 538 * nr_disks is not constant 539 */ 540 tmp1->nr_disks = 0; 541 tmp2->nr_disks = 0; 542 543 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) 544 ret = 0; 545 else 546 ret = 1; 547 548 abort: 549 kfree(tmp1); 550 kfree(tmp2); 551 return ret; 552 } 553 554 static unsigned int calc_sb_csum(mdp_super_t * sb) 555 { 556 unsigned int disk_csum, csum; 557 558 disk_csum = sb->sb_csum; 559 sb->sb_csum = 0; 560 csum = csum_partial((void *)sb, MD_SB_BYTES, 0); 561 sb->sb_csum = disk_csum; 562 return csum; 563 } 564 565 566 /* 567 * Handle superblock details. 568 * We want to be able to handle multiple superblock formats 569 * so we have a common interface to them all, and an array of 570 * different handlers. 571 * We rely on user-space to write the initial superblock, and support 572 * reading and updating of superblocks. 573 * Interface methods are: 574 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) 575 * loads and validates a superblock on dev. 576 * if refdev != NULL, compare superblocks on both devices 577 * Return: 578 * 0 - dev has a superblock that is compatible with refdev 579 * 1 - dev has a superblock that is compatible and newer than refdev 580 * so dev should be used as the refdev in future 581 * -EINVAL superblock incompatible or invalid 582 * -othererror e.g. -EIO 583 * 584 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) 585 * Verify that dev is acceptable into mddev. 586 * The first time, mddev->raid_disks will be 0, and data from 587 * dev should be merged in. Subsequent calls check that dev 588 * is new enough. Return 0 or -EINVAL 589 * 590 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) 591 * Update the superblock for rdev with data in mddev 592 * This does not write to disc. 593 * 594 */ 595 596 struct super_type { 597 char *name; 598 struct module *owner; 599 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); 600 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); 601 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); 602 }; 603 604 /* 605 * load_super for 0.90.0 606 */ 607 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 608 { 609 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 610 mdp_super_t *sb; 611 int ret; 612 sector_t sb_offset; 613 614 /* 615 * Calculate the position of the superblock, 616 * it's at the end of the disk. 617 * 618 * It also happens to be a multiple of 4Kb. 619 */ 620 sb_offset = calc_dev_sboffset(rdev->bdev); 621 rdev->sb_offset = sb_offset; 622 623 ret = read_disk_sb(rdev, MD_SB_BYTES); 624 if (ret) return ret; 625 626 ret = -EINVAL; 627 628 bdevname(rdev->bdev, b); 629 sb = (mdp_super_t*)page_address(rdev->sb_page); 630 631 if (sb->md_magic != MD_SB_MAGIC) { 632 printk(KERN_ERR "md: invalid raid superblock magic on %s\n", 633 b); 634 goto abort; 635 } 636 637 if (sb->major_version != 0 || 638 sb->minor_version != 90) { 639 printk(KERN_WARNING "Bad version number %d.%d on %s\n", 640 sb->major_version, sb->minor_version, 641 b); 642 goto abort; 643 } 644 645 if (sb->raid_disks <= 0) 646 goto abort; 647 648 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { 649 printk(KERN_WARNING "md: invalid superblock checksum on %s\n", 650 b); 651 goto abort; 652 } 653 654 rdev->preferred_minor = sb->md_minor; 655 rdev->data_offset = 0; 656 rdev->sb_size = MD_SB_BYTES; 657 658 if (sb->level == LEVEL_MULTIPATH) 659 rdev->desc_nr = -1; 660 else 661 rdev->desc_nr = sb->this_disk.number; 662 663 if (refdev == 0) 664 ret = 1; 665 else { 666 __u64 ev1, ev2; 667 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); 668 if (!uuid_equal(refsb, sb)) { 669 printk(KERN_WARNING "md: %s has different UUID to %s\n", 670 b, bdevname(refdev->bdev,b2)); 671 goto abort; 672 } 673 if (!sb_equal(refsb, sb)) { 674 printk(KERN_WARNING "md: %s has same UUID" 675 " but different superblock to %s\n", 676 b, bdevname(refdev->bdev, b2)); 677 goto abort; 678 } 679 ev1 = md_event(sb); 680 ev2 = md_event(refsb); 681 if (ev1 > ev2) 682 ret = 1; 683 else 684 ret = 0; 685 } 686 rdev->size = calc_dev_size(rdev, sb->chunk_size); 687 688 abort: 689 return ret; 690 } 691 692 /* 693 * validate_super for 0.90.0 694 */ 695 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) 696 { 697 mdp_disk_t *desc; 698 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); 699 700 rdev->raid_disk = -1; 701 rdev->flags = 0; 702 if (mddev->raid_disks == 0) { 703 mddev->major_version = 0; 704 mddev->minor_version = sb->minor_version; 705 mddev->patch_version = sb->patch_version; 706 mddev->persistent = ! sb->not_persistent; 707 mddev->chunk_size = sb->chunk_size; 708 mddev->ctime = sb->ctime; 709 mddev->utime = sb->utime; 710 mddev->level = sb->level; 711 mddev->layout = sb->layout; 712 mddev->raid_disks = sb->raid_disks; 713 mddev->size = sb->size; 714 mddev->events = md_event(sb); 715 mddev->bitmap_offset = 0; 716 mddev->default_bitmap_offset = MD_SB_BYTES >> 9; 717 718 if (sb->state & (1<<MD_SB_CLEAN)) 719 mddev->recovery_cp = MaxSector; 720 else { 721 if (sb->events_hi == sb->cp_events_hi && 722 sb->events_lo == sb->cp_events_lo) { 723 mddev->recovery_cp = sb->recovery_cp; 724 } else 725 mddev->recovery_cp = 0; 726 } 727 728 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 729 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 730 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 731 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 732 733 mddev->max_disks = MD_SB_DISKS; 734 735 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 736 mddev->bitmap_file == NULL) { 737 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 738 && mddev->level != 10) { 739 /* FIXME use a better test */ 740 printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); 741 return -EINVAL; 742 } 743 mddev->bitmap_offset = mddev->default_bitmap_offset; 744 } 745 746 } else if (mddev->pers == NULL) { 747 /* Insist on good event counter while assembling */ 748 __u64 ev1 = md_event(sb); 749 ++ev1; 750 if (ev1 < mddev->events) 751 return -EINVAL; 752 } else if (mddev->bitmap) { 753 /* if adding to array with a bitmap, then we can accept an 754 * older device ... but not too old. 755 */ 756 __u64 ev1 = md_event(sb); 757 if (ev1 < mddev->bitmap->events_cleared) 758 return 0; 759 } else /* just a hot-add of a new device, leave raid_disk at -1 */ 760 return 0; 761 762 if (mddev->level != LEVEL_MULTIPATH) { 763 desc = sb->disks + rdev->desc_nr; 764 765 if (desc->state & (1<<MD_DISK_FAULTY)) 766 set_bit(Faulty, &rdev->flags); 767 else if (desc->state & (1<<MD_DISK_SYNC) && 768 desc->raid_disk < mddev->raid_disks) { 769 set_bit(In_sync, &rdev->flags); 770 rdev->raid_disk = desc->raid_disk; 771 } 772 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 773 set_bit(WriteMostly, &rdev->flags); 774 } else /* MULTIPATH are always insync */ 775 set_bit(In_sync, &rdev->flags); 776 return 0; 777 } 778 779 /* 780 * sync_super for 0.90.0 781 */ 782 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) 783 { 784 mdp_super_t *sb; 785 struct list_head *tmp; 786 mdk_rdev_t *rdev2; 787 int next_spare = mddev->raid_disks; 788 789 790 /* make rdev->sb match mddev data.. 791 * 792 * 1/ zero out disks 793 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 794 * 3/ any empty disks < next_spare become removed 795 * 796 * disks[0] gets initialised to REMOVED because 797 * we cannot be sure from other fields if it has 798 * been initialised or not. 799 */ 800 int i; 801 int active=0, working=0,failed=0,spare=0,nr_disks=0; 802 803 rdev->sb_size = MD_SB_BYTES; 804 805 sb = (mdp_super_t*)page_address(rdev->sb_page); 806 807 memset(sb, 0, sizeof(*sb)); 808 809 sb->md_magic = MD_SB_MAGIC; 810 sb->major_version = mddev->major_version; 811 sb->minor_version = mddev->minor_version; 812 sb->patch_version = mddev->patch_version; 813 sb->gvalid_words = 0; /* ignored */ 814 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 815 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 816 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 817 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 818 819 sb->ctime = mddev->ctime; 820 sb->level = mddev->level; 821 sb->size = mddev->size; 822 sb->raid_disks = mddev->raid_disks; 823 sb->md_minor = mddev->md_minor; 824 sb->not_persistent = !mddev->persistent; 825 sb->utime = mddev->utime; 826 sb->state = 0; 827 sb->events_hi = (mddev->events>>32); 828 sb->events_lo = (u32)mddev->events; 829 830 if (mddev->in_sync) 831 { 832 sb->recovery_cp = mddev->recovery_cp; 833 sb->cp_events_hi = (mddev->events>>32); 834 sb->cp_events_lo = (u32)mddev->events; 835 if (mddev->recovery_cp == MaxSector) 836 sb->state = (1<< MD_SB_CLEAN); 837 } else 838 sb->recovery_cp = 0; 839 840 sb->layout = mddev->layout; 841 sb->chunk_size = mddev->chunk_size; 842 843 if (mddev->bitmap && mddev->bitmap_file == NULL) 844 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 845 846 sb->disks[0].state = (1<<MD_DISK_REMOVED); 847 ITERATE_RDEV(mddev,rdev2,tmp) { 848 mdp_disk_t *d; 849 int desc_nr; 850 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) 851 && !test_bit(Faulty, &rdev2->flags)) 852 desc_nr = rdev2->raid_disk; 853 else 854 desc_nr = next_spare++; 855 rdev2->desc_nr = desc_nr; 856 d = &sb->disks[rdev2->desc_nr]; 857 nr_disks++; 858 d->number = rdev2->desc_nr; 859 d->major = MAJOR(rdev2->bdev->bd_dev); 860 d->minor = MINOR(rdev2->bdev->bd_dev); 861 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) 862 && !test_bit(Faulty, &rdev2->flags)) 863 d->raid_disk = rdev2->raid_disk; 864 else 865 d->raid_disk = rdev2->desc_nr; /* compatibility */ 866 if (test_bit(Faulty, &rdev2->flags)) { 867 d->state = (1<<MD_DISK_FAULTY); 868 failed++; 869 } else if (test_bit(In_sync, &rdev2->flags)) { 870 d->state = (1<<MD_DISK_ACTIVE); 871 d->state |= (1<<MD_DISK_SYNC); 872 active++; 873 working++; 874 } else { 875 d->state = 0; 876 spare++; 877 working++; 878 } 879 if (test_bit(WriteMostly, &rdev2->flags)) 880 d->state |= (1<<MD_DISK_WRITEMOSTLY); 881 } 882 /* now set the "removed" and "faulty" bits on any missing devices */ 883 for (i=0 ; i < mddev->raid_disks ; i++) { 884 mdp_disk_t *d = &sb->disks[i]; 885 if (d->state == 0 && d->number == 0) { 886 d->number = i; 887 d->raid_disk = i; 888 d->state = (1<<MD_DISK_REMOVED); 889 d->state |= (1<<MD_DISK_FAULTY); 890 failed++; 891 } 892 } 893 sb->nr_disks = nr_disks; 894 sb->active_disks = active; 895 sb->working_disks = working; 896 sb->failed_disks = failed; 897 sb->spare_disks = spare; 898 899 sb->this_disk = sb->disks[rdev->desc_nr]; 900 sb->sb_csum = calc_sb_csum(sb); 901 } 902 903 /* 904 * version 1 superblock 905 */ 906 907 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) 908 { 909 unsigned int disk_csum, csum; 910 unsigned long long newcsum; 911 int size = 256 + le32_to_cpu(sb->max_dev)*2; 912 unsigned int *isuper = (unsigned int*)sb; 913 int i; 914 915 disk_csum = sb->sb_csum; 916 sb->sb_csum = 0; 917 newcsum = 0; 918 for (i=0; size>=4; size -= 4 ) 919 newcsum += le32_to_cpu(*isuper++); 920 921 if (size == 2) 922 newcsum += le16_to_cpu(*(unsigned short*) isuper); 923 924 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 925 sb->sb_csum = disk_csum; 926 return cpu_to_le32(csum); 927 } 928 929 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 930 { 931 struct mdp_superblock_1 *sb; 932 int ret; 933 sector_t sb_offset; 934 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 935 int bmask; 936 937 /* 938 * Calculate the position of the superblock. 939 * It is always aligned to a 4K boundary and 940 * depeding on minor_version, it can be: 941 * 0: At least 8K, but less than 12K, from end of device 942 * 1: At start of device 943 * 2: 4K from start of device. 944 */ 945 switch(minor_version) { 946 case 0: 947 sb_offset = rdev->bdev->bd_inode->i_size >> 9; 948 sb_offset -= 8*2; 949 sb_offset &= ~(sector_t)(4*2-1); 950 /* convert from sectors to K */ 951 sb_offset /= 2; 952 break; 953 case 1: 954 sb_offset = 0; 955 break; 956 case 2: 957 sb_offset = 4; 958 break; 959 default: 960 return -EINVAL; 961 } 962 rdev->sb_offset = sb_offset; 963 964 /* superblock is rarely larger than 1K, but it can be larger, 965 * and it is safe to read 4k, so we do that 966 */ 967 ret = read_disk_sb(rdev, 4096); 968 if (ret) return ret; 969 970 971 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 972 973 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 974 sb->major_version != cpu_to_le32(1) || 975 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 976 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || 977 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 978 return -EINVAL; 979 980 if (calc_sb_1_csum(sb) != sb->sb_csum) { 981 printk("md: invalid superblock checksum on %s\n", 982 bdevname(rdev->bdev,b)); 983 return -EINVAL; 984 } 985 if (le64_to_cpu(sb->data_size) < 10) { 986 printk("md: data_size too small on %s\n", 987 bdevname(rdev->bdev,b)); 988 return -EINVAL; 989 } 990 rdev->preferred_minor = 0xffff; 991 rdev->data_offset = le64_to_cpu(sb->data_offset); 992 993 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 994 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; 995 if (rdev->sb_size & bmask) 996 rdev-> sb_size = (rdev->sb_size | bmask)+1; 997 998 if (refdev == 0) 999 return 1; 1000 else { 1001 __u64 ev1, ev2; 1002 struct mdp_superblock_1 *refsb = 1003 (struct mdp_superblock_1*)page_address(refdev->sb_page); 1004 1005 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 1006 sb->level != refsb->level || 1007 sb->layout != refsb->layout || 1008 sb->chunksize != refsb->chunksize) { 1009 printk(KERN_WARNING "md: %s has strangely different" 1010 " superblock to %s\n", 1011 bdevname(rdev->bdev,b), 1012 bdevname(refdev->bdev,b2)); 1013 return -EINVAL; 1014 } 1015 ev1 = le64_to_cpu(sb->events); 1016 ev2 = le64_to_cpu(refsb->events); 1017 1018 if (ev1 > ev2) 1019 return 1; 1020 } 1021 if (minor_version) 1022 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; 1023 else 1024 rdev->size = rdev->sb_offset; 1025 if (rdev->size < le64_to_cpu(sb->data_size)/2) 1026 return -EINVAL; 1027 rdev->size = le64_to_cpu(sb->data_size)/2; 1028 if (le32_to_cpu(sb->chunksize)) 1029 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); 1030 return 0; 1031 } 1032 1033 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) 1034 { 1035 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1036 1037 rdev->raid_disk = -1; 1038 rdev->flags = 0; 1039 if (mddev->raid_disks == 0) { 1040 mddev->major_version = 1; 1041 mddev->patch_version = 0; 1042 mddev->persistent = 1; 1043 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; 1044 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); 1045 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); 1046 mddev->level = le32_to_cpu(sb->level); 1047 mddev->layout = le32_to_cpu(sb->layout); 1048 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1049 mddev->size = le64_to_cpu(sb->size)/2; 1050 mddev->events = le64_to_cpu(sb->events); 1051 mddev->bitmap_offset = 0; 1052 mddev->default_bitmap_offset = 1024; 1053 1054 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1055 memcpy(mddev->uuid, sb->set_uuid, 16); 1056 1057 mddev->max_disks = (4096-256)/2; 1058 1059 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1060 mddev->bitmap_file == NULL ) { 1061 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 1062 && mddev->level != 10) { 1063 printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); 1064 return -EINVAL; 1065 } 1066 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); 1067 } 1068 } else if (mddev->pers == NULL) { 1069 /* Insist of good event counter while assembling */ 1070 __u64 ev1 = le64_to_cpu(sb->events); 1071 ++ev1; 1072 if (ev1 < mddev->events) 1073 return -EINVAL; 1074 } else if (mddev->bitmap) { 1075 /* If adding to array with a bitmap, then we can accept an 1076 * older device, but not too old. 1077 */ 1078 __u64 ev1 = le64_to_cpu(sb->events); 1079 if (ev1 < mddev->bitmap->events_cleared) 1080 return 0; 1081 } else /* just a hot-add of a new device, leave raid_disk at -1 */ 1082 return 0; 1083 1084 if (mddev->level != LEVEL_MULTIPATH) { 1085 int role; 1086 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1087 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1088 switch(role) { 1089 case 0xffff: /* spare */ 1090 break; 1091 case 0xfffe: /* faulty */ 1092 set_bit(Faulty, &rdev->flags); 1093 break; 1094 default: 1095 set_bit(In_sync, &rdev->flags); 1096 rdev->raid_disk = role; 1097 break; 1098 } 1099 if (sb->devflags & WriteMostly1) 1100 set_bit(WriteMostly, &rdev->flags); 1101 } else /* MULTIPATH are always insync */ 1102 set_bit(In_sync, &rdev->flags); 1103 1104 return 0; 1105 } 1106 1107 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) 1108 { 1109 struct mdp_superblock_1 *sb; 1110 struct list_head *tmp; 1111 mdk_rdev_t *rdev2; 1112 int max_dev, i; 1113 /* make rdev->sb match mddev and rdev data. */ 1114 1115 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1116 1117 sb->feature_map = 0; 1118 sb->pad0 = 0; 1119 memset(sb->pad1, 0, sizeof(sb->pad1)); 1120 memset(sb->pad2, 0, sizeof(sb->pad2)); 1121 memset(sb->pad3, 0, sizeof(sb->pad3)); 1122 1123 sb->utime = cpu_to_le64((__u64)mddev->utime); 1124 sb->events = cpu_to_le64(mddev->events); 1125 if (mddev->in_sync) 1126 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1127 else 1128 sb->resync_offset = cpu_to_le64(0); 1129 1130 if (mddev->bitmap && mddev->bitmap_file == NULL) { 1131 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); 1132 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1133 } 1134 1135 max_dev = 0; 1136 ITERATE_RDEV(mddev,rdev2,tmp) 1137 if (rdev2->desc_nr+1 > max_dev) 1138 max_dev = rdev2->desc_nr+1; 1139 1140 sb->max_dev = cpu_to_le32(max_dev); 1141 for (i=0; i<max_dev;i++) 1142 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1143 1144 ITERATE_RDEV(mddev,rdev2,tmp) { 1145 i = rdev2->desc_nr; 1146 if (test_bit(Faulty, &rdev2->flags)) 1147 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1148 else if (test_bit(In_sync, &rdev2->flags)) 1149 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1150 else 1151 sb->dev_roles[i] = cpu_to_le16(0xffff); 1152 } 1153 1154 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ 1155 sb->sb_csum = calc_sb_1_csum(sb); 1156 } 1157 1158 1159 static struct super_type super_types[] = { 1160 [0] = { 1161 .name = "0.90.0", 1162 .owner = THIS_MODULE, 1163 .load_super = super_90_load, 1164 .validate_super = super_90_validate, 1165 .sync_super = super_90_sync, 1166 }, 1167 [1] = { 1168 .name = "md-1", 1169 .owner = THIS_MODULE, 1170 .load_super = super_1_load, 1171 .validate_super = super_1_validate, 1172 .sync_super = super_1_sync, 1173 }, 1174 }; 1175 1176 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) 1177 { 1178 struct list_head *tmp; 1179 mdk_rdev_t *rdev; 1180 1181 ITERATE_RDEV(mddev,rdev,tmp) 1182 if (rdev->bdev->bd_contains == dev->bdev->bd_contains) 1183 return rdev; 1184 1185 return NULL; 1186 } 1187 1188 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) 1189 { 1190 struct list_head *tmp; 1191 mdk_rdev_t *rdev; 1192 1193 ITERATE_RDEV(mddev1,rdev,tmp) 1194 if (match_dev_unit(mddev2, rdev)) 1195 return 1; 1196 1197 return 0; 1198 } 1199 1200 static LIST_HEAD(pending_raid_disks); 1201 1202 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) 1203 { 1204 mdk_rdev_t *same_pdev; 1205 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1206 struct kobject *ko; 1207 1208 if (rdev->mddev) { 1209 MD_BUG(); 1210 return -EINVAL; 1211 } 1212 same_pdev = match_dev_unit(mddev, rdev); 1213 if (same_pdev) 1214 printk(KERN_WARNING 1215 "%s: WARNING: %s appears to be on the same physical" 1216 " disk as %s. True\n protection against single-disk" 1217 " failure might be compromised.\n", 1218 mdname(mddev), bdevname(rdev->bdev,b), 1219 bdevname(same_pdev->bdev,b2)); 1220 1221 /* Verify rdev->desc_nr is unique. 1222 * If it is -1, assign a free number, else 1223 * check number is not in use 1224 */ 1225 if (rdev->desc_nr < 0) { 1226 int choice = 0; 1227 if (mddev->pers) choice = mddev->raid_disks; 1228 while (find_rdev_nr(mddev, choice)) 1229 choice++; 1230 rdev->desc_nr = choice; 1231 } else { 1232 if (find_rdev_nr(mddev, rdev->desc_nr)) 1233 return -EBUSY; 1234 } 1235 bdevname(rdev->bdev,b); 1236 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) 1237 return -ENOMEM; 1238 1239 list_add(&rdev->same_set, &mddev->disks); 1240 rdev->mddev = mddev; 1241 printk(KERN_INFO "md: bind<%s>\n", b); 1242 1243 rdev->kobj.parent = &mddev->kobj; 1244 kobject_add(&rdev->kobj); 1245 1246 if (rdev->bdev->bd_part) 1247 ko = &rdev->bdev->bd_part->kobj; 1248 else 1249 ko = &rdev->bdev->bd_disk->kobj; 1250 sysfs_create_link(&rdev->kobj, ko, "block"); 1251 return 0; 1252 } 1253 1254 static void unbind_rdev_from_array(mdk_rdev_t * rdev) 1255 { 1256 char b[BDEVNAME_SIZE]; 1257 if (!rdev->mddev) { 1258 MD_BUG(); 1259 return; 1260 } 1261 list_del_init(&rdev->same_set); 1262 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); 1263 rdev->mddev = NULL; 1264 sysfs_remove_link(&rdev->kobj, "block"); 1265 kobject_del(&rdev->kobj); 1266 } 1267 1268 /* 1269 * prevent the device from being mounted, repartitioned or 1270 * otherwise reused by a RAID array (or any other kernel 1271 * subsystem), by bd_claiming the device. 1272 */ 1273 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) 1274 { 1275 int err = 0; 1276 struct block_device *bdev; 1277 char b[BDEVNAME_SIZE]; 1278 1279 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 1280 if (IS_ERR(bdev)) { 1281 printk(KERN_ERR "md: could not open %s.\n", 1282 __bdevname(dev, b)); 1283 return PTR_ERR(bdev); 1284 } 1285 err = bd_claim(bdev, rdev); 1286 if (err) { 1287 printk(KERN_ERR "md: could not bd_claim %s.\n", 1288 bdevname(bdev, b)); 1289 blkdev_put(bdev); 1290 return err; 1291 } 1292 rdev->bdev = bdev; 1293 return err; 1294 } 1295 1296 static void unlock_rdev(mdk_rdev_t *rdev) 1297 { 1298 struct block_device *bdev = rdev->bdev; 1299 rdev->bdev = NULL; 1300 if (!bdev) 1301 MD_BUG(); 1302 bd_release(bdev); 1303 blkdev_put(bdev); 1304 } 1305 1306 void md_autodetect_dev(dev_t dev); 1307 1308 static void export_rdev(mdk_rdev_t * rdev) 1309 { 1310 char b[BDEVNAME_SIZE]; 1311 printk(KERN_INFO "md: export_rdev(%s)\n", 1312 bdevname(rdev->bdev,b)); 1313 if (rdev->mddev) 1314 MD_BUG(); 1315 free_disk_sb(rdev); 1316 list_del_init(&rdev->same_set); 1317 #ifndef MODULE 1318 md_autodetect_dev(rdev->bdev->bd_dev); 1319 #endif 1320 unlock_rdev(rdev); 1321 kobject_put(&rdev->kobj); 1322 } 1323 1324 static void kick_rdev_from_array(mdk_rdev_t * rdev) 1325 { 1326 unbind_rdev_from_array(rdev); 1327 export_rdev(rdev); 1328 } 1329 1330 static void export_array(mddev_t *mddev) 1331 { 1332 struct list_head *tmp; 1333 mdk_rdev_t *rdev; 1334 1335 ITERATE_RDEV(mddev,rdev,tmp) { 1336 if (!rdev->mddev) { 1337 MD_BUG(); 1338 continue; 1339 } 1340 kick_rdev_from_array(rdev); 1341 } 1342 if (!list_empty(&mddev->disks)) 1343 MD_BUG(); 1344 mddev->raid_disks = 0; 1345 mddev->major_version = 0; 1346 } 1347 1348 static void print_desc(mdp_disk_t *desc) 1349 { 1350 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, 1351 desc->major,desc->minor,desc->raid_disk,desc->state); 1352 } 1353 1354 static void print_sb(mdp_super_t *sb) 1355 { 1356 int i; 1357 1358 printk(KERN_INFO 1359 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", 1360 sb->major_version, sb->minor_version, sb->patch_version, 1361 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, 1362 sb->ctime); 1363 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", 1364 sb->level, sb->size, sb->nr_disks, sb->raid_disks, 1365 sb->md_minor, sb->layout, sb->chunk_size); 1366 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" 1367 " FD:%d SD:%d CSUM:%08x E:%08lx\n", 1368 sb->utime, sb->state, sb->active_disks, sb->working_disks, 1369 sb->failed_disks, sb->spare_disks, 1370 sb->sb_csum, (unsigned long)sb->events_lo); 1371 1372 printk(KERN_INFO); 1373 for (i = 0; i < MD_SB_DISKS; i++) { 1374 mdp_disk_t *desc; 1375 1376 desc = sb->disks + i; 1377 if (desc->number || desc->major || desc->minor || 1378 desc->raid_disk || (desc->state && (desc->state != 4))) { 1379 printk(" D %2d: ", i); 1380 print_desc(desc); 1381 } 1382 } 1383 printk(KERN_INFO "md: THIS: "); 1384 print_desc(&sb->this_disk); 1385 1386 } 1387 1388 static void print_rdev(mdk_rdev_t *rdev) 1389 { 1390 char b[BDEVNAME_SIZE]; 1391 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", 1392 bdevname(rdev->bdev,b), (unsigned long long)rdev->size, 1393 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), 1394 rdev->desc_nr); 1395 if (rdev->sb_loaded) { 1396 printk(KERN_INFO "md: rdev superblock:\n"); 1397 print_sb((mdp_super_t*)page_address(rdev->sb_page)); 1398 } else 1399 printk(KERN_INFO "md: no rdev superblock!\n"); 1400 } 1401 1402 void md_print_devices(void) 1403 { 1404 struct list_head *tmp, *tmp2; 1405 mdk_rdev_t *rdev; 1406 mddev_t *mddev; 1407 char b[BDEVNAME_SIZE]; 1408 1409 printk("\n"); 1410 printk("md: **********************************\n"); 1411 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); 1412 printk("md: **********************************\n"); 1413 ITERATE_MDDEV(mddev,tmp) { 1414 1415 if (mddev->bitmap) 1416 bitmap_print_sb(mddev->bitmap); 1417 else 1418 printk("%s: ", mdname(mddev)); 1419 ITERATE_RDEV(mddev,rdev,tmp2) 1420 printk("<%s>", bdevname(rdev->bdev,b)); 1421 printk("\n"); 1422 1423 ITERATE_RDEV(mddev,rdev,tmp2) 1424 print_rdev(rdev); 1425 } 1426 printk("md: **********************************\n"); 1427 printk("\n"); 1428 } 1429 1430 1431 static void sync_sbs(mddev_t * mddev) 1432 { 1433 mdk_rdev_t *rdev; 1434 struct list_head *tmp; 1435 1436 ITERATE_RDEV(mddev,rdev,tmp) { 1437 super_types[mddev->major_version]. 1438 sync_super(mddev, rdev); 1439 rdev->sb_loaded = 1; 1440 } 1441 } 1442 1443 static void md_update_sb(mddev_t * mddev) 1444 { 1445 int err; 1446 struct list_head *tmp; 1447 mdk_rdev_t *rdev; 1448 int sync_req; 1449 1450 repeat: 1451 spin_lock_irq(&mddev->write_lock); 1452 sync_req = mddev->in_sync; 1453 mddev->utime = get_seconds(); 1454 mddev->events ++; 1455 1456 if (!mddev->events) { 1457 /* 1458 * oops, this 64-bit counter should never wrap. 1459 * Either we are in around ~1 trillion A.C., assuming 1460 * 1 reboot per second, or we have a bug: 1461 */ 1462 MD_BUG(); 1463 mddev->events --; 1464 } 1465 mddev->sb_dirty = 2; 1466 sync_sbs(mddev); 1467 1468 /* 1469 * do not write anything to disk if using 1470 * nonpersistent superblocks 1471 */ 1472 if (!mddev->persistent) { 1473 mddev->sb_dirty = 0; 1474 spin_unlock_irq(&mddev->write_lock); 1475 wake_up(&mddev->sb_wait); 1476 return; 1477 } 1478 spin_unlock_irq(&mddev->write_lock); 1479 1480 dprintk(KERN_INFO 1481 "md: updating %s RAID superblock on device (in sync %d)\n", 1482 mdname(mddev),mddev->in_sync); 1483 1484 err = bitmap_update_sb(mddev->bitmap); 1485 ITERATE_RDEV(mddev,rdev,tmp) { 1486 char b[BDEVNAME_SIZE]; 1487 dprintk(KERN_INFO "md: "); 1488 if (test_bit(Faulty, &rdev->flags)) 1489 dprintk("(skipping faulty "); 1490 1491 dprintk("%s ", bdevname(rdev->bdev,b)); 1492 if (!test_bit(Faulty, &rdev->flags)) { 1493 md_super_write(mddev,rdev, 1494 rdev->sb_offset<<1, rdev->sb_size, 1495 rdev->sb_page); 1496 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", 1497 bdevname(rdev->bdev,b), 1498 (unsigned long long)rdev->sb_offset); 1499 1500 } else 1501 dprintk(")\n"); 1502 if (mddev->level == LEVEL_MULTIPATH) 1503 /* only need to write one superblock... */ 1504 break; 1505 } 1506 md_super_wait(mddev); 1507 /* if there was a failure, sb_dirty was set to 1, and we re-write super */ 1508 1509 spin_lock_irq(&mddev->write_lock); 1510 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { 1511 /* have to write it out again */ 1512 spin_unlock_irq(&mddev->write_lock); 1513 goto repeat; 1514 } 1515 mddev->sb_dirty = 0; 1516 spin_unlock_irq(&mddev->write_lock); 1517 wake_up(&mddev->sb_wait); 1518 1519 } 1520 1521 struct rdev_sysfs_entry { 1522 struct attribute attr; 1523 ssize_t (*show)(mdk_rdev_t *, char *); 1524 ssize_t (*store)(mdk_rdev_t *, const char *, size_t); 1525 }; 1526 1527 static ssize_t 1528 state_show(mdk_rdev_t *rdev, char *page) 1529 { 1530 char *sep = ""; 1531 int len=0; 1532 1533 if (test_bit(Faulty, &rdev->flags)) { 1534 len+= sprintf(page+len, "%sfaulty",sep); 1535 sep = ","; 1536 } 1537 if (test_bit(In_sync, &rdev->flags)) { 1538 len += sprintf(page+len, "%sin_sync",sep); 1539 sep = ","; 1540 } 1541 if (!test_bit(Faulty, &rdev->flags) && 1542 !test_bit(In_sync, &rdev->flags)) { 1543 len += sprintf(page+len, "%sspare", sep); 1544 sep = ","; 1545 } 1546 return len+sprintf(page+len, "\n"); 1547 } 1548 1549 static struct rdev_sysfs_entry 1550 rdev_state = __ATTR_RO(state); 1551 1552 static ssize_t 1553 super_show(mdk_rdev_t *rdev, char *page) 1554 { 1555 if (rdev->sb_loaded && rdev->sb_size) { 1556 memcpy(page, page_address(rdev->sb_page), rdev->sb_size); 1557 return rdev->sb_size; 1558 } else 1559 return 0; 1560 } 1561 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); 1562 1563 static struct attribute *rdev_default_attrs[] = { 1564 &rdev_state.attr, 1565 &rdev_super.attr, 1566 NULL, 1567 }; 1568 static ssize_t 1569 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 1570 { 1571 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 1572 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 1573 1574 if (!entry->show) 1575 return -EIO; 1576 return entry->show(rdev, page); 1577 } 1578 1579 static ssize_t 1580 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 1581 const char *page, size_t length) 1582 { 1583 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 1584 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 1585 1586 if (!entry->store) 1587 return -EIO; 1588 return entry->store(rdev, page, length); 1589 } 1590 1591 static void rdev_free(struct kobject *ko) 1592 { 1593 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); 1594 kfree(rdev); 1595 } 1596 static struct sysfs_ops rdev_sysfs_ops = { 1597 .show = rdev_attr_show, 1598 .store = rdev_attr_store, 1599 }; 1600 static struct kobj_type rdev_ktype = { 1601 .release = rdev_free, 1602 .sysfs_ops = &rdev_sysfs_ops, 1603 .default_attrs = rdev_default_attrs, 1604 }; 1605 1606 /* 1607 * Import a device. If 'super_format' >= 0, then sanity check the superblock 1608 * 1609 * mark the device faulty if: 1610 * 1611 * - the device is nonexistent (zero size) 1612 * - the device has no valid superblock 1613 * 1614 * a faulty rdev _never_ has rdev->sb set. 1615 */ 1616 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) 1617 { 1618 char b[BDEVNAME_SIZE]; 1619 int err; 1620 mdk_rdev_t *rdev; 1621 sector_t size; 1622 1623 rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL); 1624 if (!rdev) { 1625 printk(KERN_ERR "md: could not alloc mem for new device!\n"); 1626 return ERR_PTR(-ENOMEM); 1627 } 1628 memset(rdev, 0, sizeof(*rdev)); 1629 1630 if ((err = alloc_disk_sb(rdev))) 1631 goto abort_free; 1632 1633 err = lock_rdev(rdev, newdev); 1634 if (err) 1635 goto abort_free; 1636 1637 rdev->kobj.parent = NULL; 1638 rdev->kobj.ktype = &rdev_ktype; 1639 kobject_init(&rdev->kobj); 1640 1641 rdev->desc_nr = -1; 1642 rdev->flags = 0; 1643 rdev->data_offset = 0; 1644 atomic_set(&rdev->nr_pending, 0); 1645 atomic_set(&rdev->read_errors, 0); 1646 1647 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 1648 if (!size) { 1649 printk(KERN_WARNING 1650 "md: %s has zero or unknown size, marking faulty!\n", 1651 bdevname(rdev->bdev,b)); 1652 err = -EINVAL; 1653 goto abort_free; 1654 } 1655 1656 if (super_format >= 0) { 1657 err = super_types[super_format]. 1658 load_super(rdev, NULL, super_minor); 1659 if (err == -EINVAL) { 1660 printk(KERN_WARNING 1661 "md: %s has invalid sb, not importing!\n", 1662 bdevname(rdev->bdev,b)); 1663 goto abort_free; 1664 } 1665 if (err < 0) { 1666 printk(KERN_WARNING 1667 "md: could not read %s's sb, not importing!\n", 1668 bdevname(rdev->bdev,b)); 1669 goto abort_free; 1670 } 1671 } 1672 INIT_LIST_HEAD(&rdev->same_set); 1673 1674 return rdev; 1675 1676 abort_free: 1677 if (rdev->sb_page) { 1678 if (rdev->bdev) 1679 unlock_rdev(rdev); 1680 free_disk_sb(rdev); 1681 } 1682 kfree(rdev); 1683 return ERR_PTR(err); 1684 } 1685 1686 /* 1687 * Check a full RAID array for plausibility 1688 */ 1689 1690 1691 static void analyze_sbs(mddev_t * mddev) 1692 { 1693 int i; 1694 struct list_head *tmp; 1695 mdk_rdev_t *rdev, *freshest; 1696 char b[BDEVNAME_SIZE]; 1697 1698 freshest = NULL; 1699 ITERATE_RDEV(mddev,rdev,tmp) 1700 switch (super_types[mddev->major_version]. 1701 load_super(rdev, freshest, mddev->minor_version)) { 1702 case 1: 1703 freshest = rdev; 1704 break; 1705 case 0: 1706 break; 1707 default: 1708 printk( KERN_ERR \ 1709 "md: fatal superblock inconsistency in %s" 1710 " -- removing from array\n", 1711 bdevname(rdev->bdev,b)); 1712 kick_rdev_from_array(rdev); 1713 } 1714 1715 1716 super_types[mddev->major_version]. 1717 validate_super(mddev, freshest); 1718 1719 i = 0; 1720 ITERATE_RDEV(mddev,rdev,tmp) { 1721 if (rdev != freshest) 1722 if (super_types[mddev->major_version]. 1723 validate_super(mddev, rdev)) { 1724 printk(KERN_WARNING "md: kicking non-fresh %s" 1725 " from array!\n", 1726 bdevname(rdev->bdev,b)); 1727 kick_rdev_from_array(rdev); 1728 continue; 1729 } 1730 if (mddev->level == LEVEL_MULTIPATH) { 1731 rdev->desc_nr = i++; 1732 rdev->raid_disk = rdev->desc_nr; 1733 set_bit(In_sync, &rdev->flags); 1734 } 1735 } 1736 1737 1738 1739 if (mddev->recovery_cp != MaxSector && 1740 mddev->level >= 1) 1741 printk(KERN_ERR "md: %s: raid array is not clean" 1742 " -- starting background reconstruction\n", 1743 mdname(mddev)); 1744 1745 } 1746 1747 static ssize_t 1748 level_show(mddev_t *mddev, char *page) 1749 { 1750 mdk_personality_t *p = mddev->pers; 1751 if (p == NULL && mddev->raid_disks == 0) 1752 return 0; 1753 if (mddev->level >= 0) 1754 return sprintf(page, "raid%d\n", mddev->level); 1755 else 1756 return sprintf(page, "%s\n", p->name); 1757 } 1758 1759 static struct md_sysfs_entry md_level = __ATTR_RO(level); 1760 1761 static ssize_t 1762 raid_disks_show(mddev_t *mddev, char *page) 1763 { 1764 if (mddev->raid_disks == 0) 1765 return 0; 1766 return sprintf(page, "%d\n", mddev->raid_disks); 1767 } 1768 1769 static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks); 1770 1771 static ssize_t 1772 action_show(mddev_t *mddev, char *page) 1773 { 1774 char *type = "idle"; 1775 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 1776 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { 1777 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 1778 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 1779 type = "resync"; 1780 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 1781 type = "check"; 1782 else 1783 type = "repair"; 1784 } else 1785 type = "recover"; 1786 } 1787 return sprintf(page, "%s\n", type); 1788 } 1789 1790 static ssize_t 1791 action_store(mddev_t *mddev, const char *page, size_t len) 1792 { 1793 if (!mddev->pers || !mddev->pers->sync_request) 1794 return -EINVAL; 1795 1796 if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) { 1797 if (mddev->sync_thread) { 1798 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1799 md_unregister_thread(mddev->sync_thread); 1800 mddev->sync_thread = NULL; 1801 mddev->recovery = 0; 1802 } 1803 return len; 1804 } 1805 1806 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 1807 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 1808 return -EBUSY; 1809 if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 || 1810 strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0) 1811 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 1812 else { 1813 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0) 1814 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 1815 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0) 1816 return -EINVAL; 1817 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 1818 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 1819 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 1820 } 1821 md_wakeup_thread(mddev->thread); 1822 return len; 1823 } 1824 1825 static ssize_t 1826 mismatch_cnt_show(mddev_t *mddev, char *page) 1827 { 1828 return sprintf(page, "%llu\n", 1829 (unsigned long long) mddev->resync_mismatches); 1830 } 1831 1832 static struct md_sysfs_entry 1833 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 1834 1835 1836 static struct md_sysfs_entry 1837 md_mismatches = __ATTR_RO(mismatch_cnt); 1838 1839 static struct attribute *md_default_attrs[] = { 1840 &md_level.attr, 1841 &md_raid_disks.attr, 1842 NULL, 1843 }; 1844 1845 static struct attribute *md_redundancy_attrs[] = { 1846 &md_scan_mode.attr, 1847 &md_mismatches.attr, 1848 NULL, 1849 }; 1850 static struct attribute_group md_redundancy_group = { 1851 .name = NULL, 1852 .attrs = md_redundancy_attrs, 1853 }; 1854 1855 1856 static ssize_t 1857 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 1858 { 1859 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 1860 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 1861 ssize_t rv; 1862 1863 if (!entry->show) 1864 return -EIO; 1865 mddev_lock(mddev); 1866 rv = entry->show(mddev, page); 1867 mddev_unlock(mddev); 1868 return rv; 1869 } 1870 1871 static ssize_t 1872 md_attr_store(struct kobject *kobj, struct attribute *attr, 1873 const char *page, size_t length) 1874 { 1875 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 1876 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 1877 ssize_t rv; 1878 1879 if (!entry->store) 1880 return -EIO; 1881 mddev_lock(mddev); 1882 rv = entry->store(mddev, page, length); 1883 mddev_unlock(mddev); 1884 return rv; 1885 } 1886 1887 static void md_free(struct kobject *ko) 1888 { 1889 mddev_t *mddev = container_of(ko, mddev_t, kobj); 1890 kfree(mddev); 1891 } 1892 1893 static struct sysfs_ops md_sysfs_ops = { 1894 .show = md_attr_show, 1895 .store = md_attr_store, 1896 }; 1897 static struct kobj_type md_ktype = { 1898 .release = md_free, 1899 .sysfs_ops = &md_sysfs_ops, 1900 .default_attrs = md_default_attrs, 1901 }; 1902 1903 int mdp_major = 0; 1904 1905 static struct kobject *md_probe(dev_t dev, int *part, void *data) 1906 { 1907 static DECLARE_MUTEX(disks_sem); 1908 mddev_t *mddev = mddev_find(dev); 1909 struct gendisk *disk; 1910 int partitioned = (MAJOR(dev) != MD_MAJOR); 1911 int shift = partitioned ? MdpMinorShift : 0; 1912 int unit = MINOR(dev) >> shift; 1913 1914 if (!mddev) 1915 return NULL; 1916 1917 down(&disks_sem); 1918 if (mddev->gendisk) { 1919 up(&disks_sem); 1920 mddev_put(mddev); 1921 return NULL; 1922 } 1923 disk = alloc_disk(1 << shift); 1924 if (!disk) { 1925 up(&disks_sem); 1926 mddev_put(mddev); 1927 return NULL; 1928 } 1929 disk->major = MAJOR(dev); 1930 disk->first_minor = unit << shift; 1931 if (partitioned) { 1932 sprintf(disk->disk_name, "md_d%d", unit); 1933 sprintf(disk->devfs_name, "md/d%d", unit); 1934 } else { 1935 sprintf(disk->disk_name, "md%d", unit); 1936 sprintf(disk->devfs_name, "md/%d", unit); 1937 } 1938 disk->fops = &md_fops; 1939 disk->private_data = mddev; 1940 disk->queue = mddev->queue; 1941 add_disk(disk); 1942 mddev->gendisk = disk; 1943 up(&disks_sem); 1944 mddev->kobj.parent = &disk->kobj; 1945 mddev->kobj.k_name = NULL; 1946 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); 1947 mddev->kobj.ktype = &md_ktype; 1948 kobject_register(&mddev->kobj); 1949 return NULL; 1950 } 1951 1952 void md_wakeup_thread(mdk_thread_t *thread); 1953 1954 static void md_safemode_timeout(unsigned long data) 1955 { 1956 mddev_t *mddev = (mddev_t *) data; 1957 1958 mddev->safemode = 1; 1959 md_wakeup_thread(mddev->thread); 1960 } 1961 1962 static int start_dirty_degraded; 1963 1964 static int do_md_run(mddev_t * mddev) 1965 { 1966 int pnum, err; 1967 int chunk_size; 1968 struct list_head *tmp; 1969 mdk_rdev_t *rdev; 1970 struct gendisk *disk; 1971 char b[BDEVNAME_SIZE]; 1972 1973 if (list_empty(&mddev->disks)) 1974 /* cannot run an array with no devices.. */ 1975 return -EINVAL; 1976 1977 if (mddev->pers) 1978 return -EBUSY; 1979 1980 /* 1981 * Analyze all RAID superblock(s) 1982 */ 1983 if (!mddev->raid_disks) 1984 analyze_sbs(mddev); 1985 1986 chunk_size = mddev->chunk_size; 1987 pnum = level_to_pers(mddev->level); 1988 1989 if ((pnum != MULTIPATH) && (pnum != RAID1)) { 1990 if (!chunk_size) { 1991 /* 1992 * 'default chunksize' in the old md code used to 1993 * be PAGE_SIZE, baaad. 1994 * we abort here to be on the safe side. We don't 1995 * want to continue the bad practice. 1996 */ 1997 printk(KERN_ERR 1998 "no chunksize specified, see 'man raidtab'\n"); 1999 return -EINVAL; 2000 } 2001 if (chunk_size > MAX_CHUNK_SIZE) { 2002 printk(KERN_ERR "too big chunk_size: %d > %d\n", 2003 chunk_size, MAX_CHUNK_SIZE); 2004 return -EINVAL; 2005 } 2006 /* 2007 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE 2008 */ 2009 if ( (1 << ffz(~chunk_size)) != chunk_size) { 2010 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); 2011 return -EINVAL; 2012 } 2013 if (chunk_size < PAGE_SIZE) { 2014 printk(KERN_ERR "too small chunk_size: %d < %ld\n", 2015 chunk_size, PAGE_SIZE); 2016 return -EINVAL; 2017 } 2018 2019 /* devices must have minimum size of one chunk */ 2020 ITERATE_RDEV(mddev,rdev,tmp) { 2021 if (test_bit(Faulty, &rdev->flags)) 2022 continue; 2023 if (rdev->size < chunk_size / 1024) { 2024 printk(KERN_WARNING 2025 "md: Dev %s smaller than chunk_size:" 2026 " %lluk < %dk\n", 2027 bdevname(rdev->bdev,b), 2028 (unsigned long long)rdev->size, 2029 chunk_size / 1024); 2030 return -EINVAL; 2031 } 2032 } 2033 } 2034 2035 #ifdef CONFIG_KMOD 2036 if (!pers[pnum]) 2037 { 2038 request_module("md-personality-%d", pnum); 2039 } 2040 #endif 2041 2042 /* 2043 * Drop all container device buffers, from now on 2044 * the only valid external interface is through the md 2045 * device. 2046 * Also find largest hardsector size 2047 */ 2048 ITERATE_RDEV(mddev,rdev,tmp) { 2049 if (test_bit(Faulty, &rdev->flags)) 2050 continue; 2051 sync_blockdev(rdev->bdev); 2052 invalidate_bdev(rdev->bdev, 0); 2053 } 2054 2055 md_probe(mddev->unit, NULL, NULL); 2056 disk = mddev->gendisk; 2057 if (!disk) 2058 return -ENOMEM; 2059 2060 spin_lock(&pers_lock); 2061 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) { 2062 spin_unlock(&pers_lock); 2063 printk(KERN_WARNING "md: personality %d is not loaded!\n", 2064 pnum); 2065 return -EINVAL; 2066 } 2067 2068 mddev->pers = pers[pnum]; 2069 spin_unlock(&pers_lock); 2070 2071 mddev->recovery = 0; 2072 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ 2073 mddev->barriers_work = 1; 2074 mddev->ok_start_degraded = start_dirty_degraded; 2075 2076 if (start_readonly) 2077 mddev->ro = 2; /* read-only, but switch on first write */ 2078 2079 err = mddev->pers->run(mddev); 2080 if (!err && mddev->pers->sync_request) { 2081 err = bitmap_create(mddev); 2082 if (err) { 2083 printk(KERN_ERR "%s: failed to create bitmap (%d)\n", 2084 mdname(mddev), err); 2085 mddev->pers->stop(mddev); 2086 } 2087 } 2088 if (err) { 2089 printk(KERN_ERR "md: pers->run() failed ...\n"); 2090 module_put(mddev->pers->owner); 2091 mddev->pers = NULL; 2092 bitmap_destroy(mddev); 2093 return err; 2094 } 2095 if (mddev->pers->sync_request) 2096 sysfs_create_group(&mddev->kobj, &md_redundancy_group); 2097 else if (mddev->ro == 2) /* auto-readonly not meaningful */ 2098 mddev->ro = 0; 2099 2100 atomic_set(&mddev->writes_pending,0); 2101 mddev->safemode = 0; 2102 mddev->safemode_timer.function = md_safemode_timeout; 2103 mddev->safemode_timer.data = (unsigned long) mddev; 2104 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ 2105 mddev->in_sync = 1; 2106 2107 ITERATE_RDEV(mddev,rdev,tmp) 2108 if (rdev->raid_disk >= 0) { 2109 char nm[20]; 2110 sprintf(nm, "rd%d", rdev->raid_disk); 2111 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 2112 } 2113 2114 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2115 md_wakeup_thread(mddev->thread); 2116 2117 if (mddev->sb_dirty) 2118 md_update_sb(mddev); 2119 2120 set_capacity(disk, mddev->array_size<<1); 2121 2122 /* If we call blk_queue_make_request here, it will 2123 * re-initialise max_sectors etc which may have been 2124 * refined inside -> run. So just set the bits we need to set. 2125 * Most initialisation happended when we called 2126 * blk_queue_make_request(..., md_fail_request) 2127 * earlier. 2128 */ 2129 mddev->queue->queuedata = mddev; 2130 mddev->queue->make_request_fn = mddev->pers->make_request; 2131 2132 mddev->changed = 1; 2133 md_new_event(mddev); 2134 return 0; 2135 } 2136 2137 static int restart_array(mddev_t *mddev) 2138 { 2139 struct gendisk *disk = mddev->gendisk; 2140 int err; 2141 2142 /* 2143 * Complain if it has no devices 2144 */ 2145 err = -ENXIO; 2146 if (list_empty(&mddev->disks)) 2147 goto out; 2148 2149 if (mddev->pers) { 2150 err = -EBUSY; 2151 if (!mddev->ro) 2152 goto out; 2153 2154 mddev->safemode = 0; 2155 mddev->ro = 0; 2156 set_disk_ro(disk, 0); 2157 2158 printk(KERN_INFO "md: %s switched to read-write mode.\n", 2159 mdname(mddev)); 2160 /* 2161 * Kick recovery or resync if necessary 2162 */ 2163 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2164 md_wakeup_thread(mddev->thread); 2165 err = 0; 2166 } else { 2167 printk(KERN_ERR "md: %s has no personality assigned.\n", 2168 mdname(mddev)); 2169 err = -EINVAL; 2170 } 2171 2172 out: 2173 return err; 2174 } 2175 2176 static int do_md_stop(mddev_t * mddev, int ro) 2177 { 2178 int err = 0; 2179 struct gendisk *disk = mddev->gendisk; 2180 2181 if (mddev->pers) { 2182 if (atomic_read(&mddev->active)>2) { 2183 printk("md: %s still in use.\n",mdname(mddev)); 2184 return -EBUSY; 2185 } 2186 2187 if (mddev->sync_thread) { 2188 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 2189 md_unregister_thread(mddev->sync_thread); 2190 mddev->sync_thread = NULL; 2191 } 2192 2193 del_timer_sync(&mddev->safemode_timer); 2194 2195 invalidate_partition(disk, 0); 2196 2197 if (ro) { 2198 err = -ENXIO; 2199 if (mddev->ro==1) 2200 goto out; 2201 mddev->ro = 1; 2202 } else { 2203 bitmap_flush(mddev); 2204 md_super_wait(mddev); 2205 if (mddev->ro) 2206 set_disk_ro(disk, 0); 2207 blk_queue_make_request(mddev->queue, md_fail_request); 2208 mddev->pers->stop(mddev); 2209 if (mddev->pers->sync_request) 2210 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 2211 2212 module_put(mddev->pers->owner); 2213 mddev->pers = NULL; 2214 if (mddev->ro) 2215 mddev->ro = 0; 2216 } 2217 if (!mddev->in_sync) { 2218 /* mark array as shutdown cleanly */ 2219 mddev->in_sync = 1; 2220 md_update_sb(mddev); 2221 } 2222 if (ro) 2223 set_disk_ro(disk, 1); 2224 } 2225 2226 bitmap_destroy(mddev); 2227 if (mddev->bitmap_file) { 2228 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); 2229 fput(mddev->bitmap_file); 2230 mddev->bitmap_file = NULL; 2231 } 2232 mddev->bitmap_offset = 0; 2233 2234 /* 2235 * Free resources if final stop 2236 */ 2237 if (!ro) { 2238 mdk_rdev_t *rdev; 2239 struct list_head *tmp; 2240 struct gendisk *disk; 2241 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); 2242 2243 ITERATE_RDEV(mddev,rdev,tmp) 2244 if (rdev->raid_disk >= 0) { 2245 char nm[20]; 2246 sprintf(nm, "rd%d", rdev->raid_disk); 2247 sysfs_remove_link(&mddev->kobj, nm); 2248 } 2249 2250 export_array(mddev); 2251 2252 mddev->array_size = 0; 2253 disk = mddev->gendisk; 2254 if (disk) 2255 set_capacity(disk, 0); 2256 mddev->changed = 1; 2257 } else 2258 printk(KERN_INFO "md: %s switched to read-only mode.\n", 2259 mdname(mddev)); 2260 err = 0; 2261 md_new_event(mddev); 2262 out: 2263 return err; 2264 } 2265 2266 static void autorun_array(mddev_t *mddev) 2267 { 2268 mdk_rdev_t *rdev; 2269 struct list_head *tmp; 2270 int err; 2271 2272 if (list_empty(&mddev->disks)) 2273 return; 2274 2275 printk(KERN_INFO "md: running: "); 2276 2277 ITERATE_RDEV(mddev,rdev,tmp) { 2278 char b[BDEVNAME_SIZE]; 2279 printk("<%s>", bdevname(rdev->bdev,b)); 2280 } 2281 printk("\n"); 2282 2283 err = do_md_run (mddev); 2284 if (err) { 2285 printk(KERN_WARNING "md: do_md_run() returned %d\n", err); 2286 do_md_stop (mddev, 0); 2287 } 2288 } 2289 2290 /* 2291 * lets try to run arrays based on all disks that have arrived 2292 * until now. (those are in pending_raid_disks) 2293 * 2294 * the method: pick the first pending disk, collect all disks with 2295 * the same UUID, remove all from the pending list and put them into 2296 * the 'same_array' list. Then order this list based on superblock 2297 * update time (freshest comes first), kick out 'old' disks and 2298 * compare superblocks. If everything's fine then run it. 2299 * 2300 * If "unit" is allocated, then bump its reference count 2301 */ 2302 static void autorun_devices(int part) 2303 { 2304 struct list_head candidates; 2305 struct list_head *tmp; 2306 mdk_rdev_t *rdev0, *rdev; 2307 mddev_t *mddev; 2308 char b[BDEVNAME_SIZE]; 2309 2310 printk(KERN_INFO "md: autorun ...\n"); 2311 while (!list_empty(&pending_raid_disks)) { 2312 dev_t dev; 2313 rdev0 = list_entry(pending_raid_disks.next, 2314 mdk_rdev_t, same_set); 2315 2316 printk(KERN_INFO "md: considering %s ...\n", 2317 bdevname(rdev0->bdev,b)); 2318 INIT_LIST_HEAD(&candidates); 2319 ITERATE_RDEV_PENDING(rdev,tmp) 2320 if (super_90_load(rdev, rdev0, 0) >= 0) { 2321 printk(KERN_INFO "md: adding %s ...\n", 2322 bdevname(rdev->bdev,b)); 2323 list_move(&rdev->same_set, &candidates); 2324 } 2325 /* 2326 * now we have a set of devices, with all of them having 2327 * mostly sane superblocks. It's time to allocate the 2328 * mddev. 2329 */ 2330 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { 2331 printk(KERN_INFO "md: unit number in %s is bad: %d\n", 2332 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 2333 break; 2334 } 2335 if (part) 2336 dev = MKDEV(mdp_major, 2337 rdev0->preferred_minor << MdpMinorShift); 2338 else 2339 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 2340 2341 md_probe(dev, NULL, NULL); 2342 mddev = mddev_find(dev); 2343 if (!mddev) { 2344 printk(KERN_ERR 2345 "md: cannot allocate memory for md drive.\n"); 2346 break; 2347 } 2348 if (mddev_lock(mddev)) 2349 printk(KERN_WARNING "md: %s locked, cannot run\n", 2350 mdname(mddev)); 2351 else if (mddev->raid_disks || mddev->major_version 2352 || !list_empty(&mddev->disks)) { 2353 printk(KERN_WARNING 2354 "md: %s already running, cannot run %s\n", 2355 mdname(mddev), bdevname(rdev0->bdev,b)); 2356 mddev_unlock(mddev); 2357 } else { 2358 printk(KERN_INFO "md: created %s\n", mdname(mddev)); 2359 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { 2360 list_del_init(&rdev->same_set); 2361 if (bind_rdev_to_array(rdev, mddev)) 2362 export_rdev(rdev); 2363 } 2364 autorun_array(mddev); 2365 mddev_unlock(mddev); 2366 } 2367 /* on success, candidates will be empty, on error 2368 * it won't... 2369 */ 2370 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) 2371 export_rdev(rdev); 2372 mddev_put(mddev); 2373 } 2374 printk(KERN_INFO "md: ... autorun DONE.\n"); 2375 } 2376 2377 /* 2378 * import RAID devices based on one partition 2379 * if possible, the array gets run as well. 2380 */ 2381 2382 static int autostart_array(dev_t startdev) 2383 { 2384 char b[BDEVNAME_SIZE]; 2385 int err = -EINVAL, i; 2386 mdp_super_t *sb = NULL; 2387 mdk_rdev_t *start_rdev = NULL, *rdev; 2388 2389 start_rdev = md_import_device(startdev, 0, 0); 2390 if (IS_ERR(start_rdev)) 2391 return err; 2392 2393 2394 /* NOTE: this can only work for 0.90.0 superblocks */ 2395 sb = (mdp_super_t*)page_address(start_rdev->sb_page); 2396 if (sb->major_version != 0 || 2397 sb->minor_version != 90 ) { 2398 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); 2399 export_rdev(start_rdev); 2400 return err; 2401 } 2402 2403 if (test_bit(Faulty, &start_rdev->flags)) { 2404 printk(KERN_WARNING 2405 "md: can not autostart based on faulty %s!\n", 2406 bdevname(start_rdev->bdev,b)); 2407 export_rdev(start_rdev); 2408 return err; 2409 } 2410 list_add(&start_rdev->same_set, &pending_raid_disks); 2411 2412 for (i = 0; i < MD_SB_DISKS; i++) { 2413 mdp_disk_t *desc = sb->disks + i; 2414 dev_t dev = MKDEV(desc->major, desc->minor); 2415 2416 if (!dev) 2417 continue; 2418 if (dev == startdev) 2419 continue; 2420 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) 2421 continue; 2422 rdev = md_import_device(dev, 0, 0); 2423 if (IS_ERR(rdev)) 2424 continue; 2425 2426 list_add(&rdev->same_set, &pending_raid_disks); 2427 } 2428 2429 /* 2430 * possibly return codes 2431 */ 2432 autorun_devices(0); 2433 return 0; 2434 2435 } 2436 2437 2438 static int get_version(void __user * arg) 2439 { 2440 mdu_version_t ver; 2441 2442 ver.major = MD_MAJOR_VERSION; 2443 ver.minor = MD_MINOR_VERSION; 2444 ver.patchlevel = MD_PATCHLEVEL_VERSION; 2445 2446 if (copy_to_user(arg, &ver, sizeof(ver))) 2447 return -EFAULT; 2448 2449 return 0; 2450 } 2451 2452 static int get_array_info(mddev_t * mddev, void __user * arg) 2453 { 2454 mdu_array_info_t info; 2455 int nr,working,active,failed,spare; 2456 mdk_rdev_t *rdev; 2457 struct list_head *tmp; 2458 2459 nr=working=active=failed=spare=0; 2460 ITERATE_RDEV(mddev,rdev,tmp) { 2461 nr++; 2462 if (test_bit(Faulty, &rdev->flags)) 2463 failed++; 2464 else { 2465 working++; 2466 if (test_bit(In_sync, &rdev->flags)) 2467 active++; 2468 else 2469 spare++; 2470 } 2471 } 2472 2473 info.major_version = mddev->major_version; 2474 info.minor_version = mddev->minor_version; 2475 info.patch_version = MD_PATCHLEVEL_VERSION; 2476 info.ctime = mddev->ctime; 2477 info.level = mddev->level; 2478 info.size = mddev->size; 2479 info.nr_disks = nr; 2480 info.raid_disks = mddev->raid_disks; 2481 info.md_minor = mddev->md_minor; 2482 info.not_persistent= !mddev->persistent; 2483 2484 info.utime = mddev->utime; 2485 info.state = 0; 2486 if (mddev->in_sync) 2487 info.state = (1<<MD_SB_CLEAN); 2488 if (mddev->bitmap && mddev->bitmap_offset) 2489 info.state = (1<<MD_SB_BITMAP_PRESENT); 2490 info.active_disks = active; 2491 info.working_disks = working; 2492 info.failed_disks = failed; 2493 info.spare_disks = spare; 2494 2495 info.layout = mddev->layout; 2496 info.chunk_size = mddev->chunk_size; 2497 2498 if (copy_to_user(arg, &info, sizeof(info))) 2499 return -EFAULT; 2500 2501 return 0; 2502 } 2503 2504 static int get_bitmap_file(mddev_t * mddev, void __user * arg) 2505 { 2506 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 2507 char *ptr, *buf = NULL; 2508 int err = -ENOMEM; 2509 2510 file = kmalloc(sizeof(*file), GFP_KERNEL); 2511 if (!file) 2512 goto out; 2513 2514 /* bitmap disabled, zero the first byte and copy out */ 2515 if (!mddev->bitmap || !mddev->bitmap->file) { 2516 file->pathname[0] = '\0'; 2517 goto copy_out; 2518 } 2519 2520 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); 2521 if (!buf) 2522 goto out; 2523 2524 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); 2525 if (!ptr) 2526 goto out; 2527 2528 strcpy(file->pathname, ptr); 2529 2530 copy_out: 2531 err = 0; 2532 if (copy_to_user(arg, file, sizeof(*file))) 2533 err = -EFAULT; 2534 out: 2535 kfree(buf); 2536 kfree(file); 2537 return err; 2538 } 2539 2540 static int get_disk_info(mddev_t * mddev, void __user * arg) 2541 { 2542 mdu_disk_info_t info; 2543 unsigned int nr; 2544 mdk_rdev_t *rdev; 2545 2546 if (copy_from_user(&info, arg, sizeof(info))) 2547 return -EFAULT; 2548 2549 nr = info.number; 2550 2551 rdev = find_rdev_nr(mddev, nr); 2552 if (rdev) { 2553 info.major = MAJOR(rdev->bdev->bd_dev); 2554 info.minor = MINOR(rdev->bdev->bd_dev); 2555 info.raid_disk = rdev->raid_disk; 2556 info.state = 0; 2557 if (test_bit(Faulty, &rdev->flags)) 2558 info.state |= (1<<MD_DISK_FAULTY); 2559 else if (test_bit(In_sync, &rdev->flags)) { 2560 info.state |= (1<<MD_DISK_ACTIVE); 2561 info.state |= (1<<MD_DISK_SYNC); 2562 } 2563 if (test_bit(WriteMostly, &rdev->flags)) 2564 info.state |= (1<<MD_DISK_WRITEMOSTLY); 2565 } else { 2566 info.major = info.minor = 0; 2567 info.raid_disk = -1; 2568 info.state = (1<<MD_DISK_REMOVED); 2569 } 2570 2571 if (copy_to_user(arg, &info, sizeof(info))) 2572 return -EFAULT; 2573 2574 return 0; 2575 } 2576 2577 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) 2578 { 2579 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 2580 mdk_rdev_t *rdev; 2581 dev_t dev = MKDEV(info->major,info->minor); 2582 2583 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 2584 return -EOVERFLOW; 2585 2586 if (!mddev->raid_disks) { 2587 int err; 2588 /* expecting a device which has a superblock */ 2589 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 2590 if (IS_ERR(rdev)) { 2591 printk(KERN_WARNING 2592 "md: md_import_device returned %ld\n", 2593 PTR_ERR(rdev)); 2594 return PTR_ERR(rdev); 2595 } 2596 if (!list_empty(&mddev->disks)) { 2597 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, 2598 mdk_rdev_t, same_set); 2599 int err = super_types[mddev->major_version] 2600 .load_super(rdev, rdev0, mddev->minor_version); 2601 if (err < 0) { 2602 printk(KERN_WARNING 2603 "md: %s has different UUID to %s\n", 2604 bdevname(rdev->bdev,b), 2605 bdevname(rdev0->bdev,b2)); 2606 export_rdev(rdev); 2607 return -EINVAL; 2608 } 2609 } 2610 err = bind_rdev_to_array(rdev, mddev); 2611 if (err) 2612 export_rdev(rdev); 2613 return err; 2614 } 2615 2616 /* 2617 * add_new_disk can be used once the array is assembled 2618 * to add "hot spares". They must already have a superblock 2619 * written 2620 */ 2621 if (mddev->pers) { 2622 int err; 2623 if (!mddev->pers->hot_add_disk) { 2624 printk(KERN_WARNING 2625 "%s: personality does not support diskops!\n", 2626 mdname(mddev)); 2627 return -EINVAL; 2628 } 2629 if (mddev->persistent) 2630 rdev = md_import_device(dev, mddev->major_version, 2631 mddev->minor_version); 2632 else 2633 rdev = md_import_device(dev, -1, -1); 2634 if (IS_ERR(rdev)) { 2635 printk(KERN_WARNING 2636 "md: md_import_device returned %ld\n", 2637 PTR_ERR(rdev)); 2638 return PTR_ERR(rdev); 2639 } 2640 /* set save_raid_disk if appropriate */ 2641 if (!mddev->persistent) { 2642 if (info->state & (1<<MD_DISK_SYNC) && 2643 info->raid_disk < mddev->raid_disks) 2644 rdev->raid_disk = info->raid_disk; 2645 else 2646 rdev->raid_disk = -1; 2647 } else 2648 super_types[mddev->major_version]. 2649 validate_super(mddev, rdev); 2650 rdev->saved_raid_disk = rdev->raid_disk; 2651 2652 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 2653 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 2654 set_bit(WriteMostly, &rdev->flags); 2655 2656 rdev->raid_disk = -1; 2657 err = bind_rdev_to_array(rdev, mddev); 2658 if (err) 2659 export_rdev(rdev); 2660 2661 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2662 md_wakeup_thread(mddev->thread); 2663 return err; 2664 } 2665 2666 /* otherwise, add_new_disk is only allowed 2667 * for major_version==0 superblocks 2668 */ 2669 if (mddev->major_version != 0) { 2670 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", 2671 mdname(mddev)); 2672 return -EINVAL; 2673 } 2674 2675 if (!(info->state & (1<<MD_DISK_FAULTY))) { 2676 int err; 2677 rdev = md_import_device (dev, -1, 0); 2678 if (IS_ERR(rdev)) { 2679 printk(KERN_WARNING 2680 "md: error, md_import_device() returned %ld\n", 2681 PTR_ERR(rdev)); 2682 return PTR_ERR(rdev); 2683 } 2684 rdev->desc_nr = info->number; 2685 if (info->raid_disk < mddev->raid_disks) 2686 rdev->raid_disk = info->raid_disk; 2687 else 2688 rdev->raid_disk = -1; 2689 2690 rdev->flags = 0; 2691 2692 if (rdev->raid_disk < mddev->raid_disks) 2693 if (info->state & (1<<MD_DISK_SYNC)) 2694 set_bit(In_sync, &rdev->flags); 2695 2696 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 2697 set_bit(WriteMostly, &rdev->flags); 2698 2699 err = bind_rdev_to_array(rdev, mddev); 2700 if (err) { 2701 export_rdev(rdev); 2702 return err; 2703 } 2704 2705 if (!mddev->persistent) { 2706 printk(KERN_INFO "md: nonpersistent superblock ...\n"); 2707 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2708 } else 2709 rdev->sb_offset = calc_dev_sboffset(rdev->bdev); 2710 rdev->size = calc_dev_size(rdev, mddev->chunk_size); 2711 2712 if (!mddev->size || (mddev->size > rdev->size)) 2713 mddev->size = rdev->size; 2714 } 2715 2716 return 0; 2717 } 2718 2719 static int hot_remove_disk(mddev_t * mddev, dev_t dev) 2720 { 2721 char b[BDEVNAME_SIZE]; 2722 mdk_rdev_t *rdev; 2723 2724 if (!mddev->pers) 2725 return -ENODEV; 2726 2727 rdev = find_rdev(mddev, dev); 2728 if (!rdev) 2729 return -ENXIO; 2730 2731 if (rdev->raid_disk >= 0) 2732 goto busy; 2733 2734 kick_rdev_from_array(rdev); 2735 md_update_sb(mddev); 2736 md_new_event(mddev); 2737 2738 return 0; 2739 busy: 2740 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", 2741 bdevname(rdev->bdev,b), mdname(mddev)); 2742 return -EBUSY; 2743 } 2744 2745 static int hot_add_disk(mddev_t * mddev, dev_t dev) 2746 { 2747 char b[BDEVNAME_SIZE]; 2748 int err; 2749 unsigned int size; 2750 mdk_rdev_t *rdev; 2751 2752 if (!mddev->pers) 2753 return -ENODEV; 2754 2755 if (mddev->major_version != 0) { 2756 printk(KERN_WARNING "%s: HOT_ADD may only be used with" 2757 " version-0 superblocks.\n", 2758 mdname(mddev)); 2759 return -EINVAL; 2760 } 2761 if (!mddev->pers->hot_add_disk) { 2762 printk(KERN_WARNING 2763 "%s: personality does not support diskops!\n", 2764 mdname(mddev)); 2765 return -EINVAL; 2766 } 2767 2768 rdev = md_import_device (dev, -1, 0); 2769 if (IS_ERR(rdev)) { 2770 printk(KERN_WARNING 2771 "md: error, md_import_device() returned %ld\n", 2772 PTR_ERR(rdev)); 2773 return -EINVAL; 2774 } 2775 2776 if (mddev->persistent) 2777 rdev->sb_offset = calc_dev_sboffset(rdev->bdev); 2778 else 2779 rdev->sb_offset = 2780 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2781 2782 size = calc_dev_size(rdev, mddev->chunk_size); 2783 rdev->size = size; 2784 2785 if (size < mddev->size) { 2786 printk(KERN_WARNING 2787 "%s: disk size %llu blocks < array size %llu\n", 2788 mdname(mddev), (unsigned long long)size, 2789 (unsigned long long)mddev->size); 2790 err = -ENOSPC; 2791 goto abort_export; 2792 } 2793 2794 if (test_bit(Faulty, &rdev->flags)) { 2795 printk(KERN_WARNING 2796 "md: can not hot-add faulty %s disk to %s!\n", 2797 bdevname(rdev->bdev,b), mdname(mddev)); 2798 err = -EINVAL; 2799 goto abort_export; 2800 } 2801 clear_bit(In_sync, &rdev->flags); 2802 rdev->desc_nr = -1; 2803 bind_rdev_to_array(rdev, mddev); 2804 2805 /* 2806 * The rest should better be atomic, we can have disk failures 2807 * noticed in interrupt contexts ... 2808 */ 2809 2810 if (rdev->desc_nr == mddev->max_disks) { 2811 printk(KERN_WARNING "%s: can not hot-add to full array!\n", 2812 mdname(mddev)); 2813 err = -EBUSY; 2814 goto abort_unbind_export; 2815 } 2816 2817 rdev->raid_disk = -1; 2818 2819 md_update_sb(mddev); 2820 2821 /* 2822 * Kick recovery, maybe this spare has to be added to the 2823 * array immediately. 2824 */ 2825 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2826 md_wakeup_thread(mddev->thread); 2827 md_new_event(mddev); 2828 return 0; 2829 2830 abort_unbind_export: 2831 unbind_rdev_from_array(rdev); 2832 2833 abort_export: 2834 export_rdev(rdev); 2835 return err; 2836 } 2837 2838 /* similar to deny_write_access, but accounts for our holding a reference 2839 * to the file ourselves */ 2840 static int deny_bitmap_write_access(struct file * file) 2841 { 2842 struct inode *inode = file->f_mapping->host; 2843 2844 spin_lock(&inode->i_lock); 2845 if (atomic_read(&inode->i_writecount) > 1) { 2846 spin_unlock(&inode->i_lock); 2847 return -ETXTBSY; 2848 } 2849 atomic_set(&inode->i_writecount, -1); 2850 spin_unlock(&inode->i_lock); 2851 2852 return 0; 2853 } 2854 2855 static int set_bitmap_file(mddev_t *mddev, int fd) 2856 { 2857 int err; 2858 2859 if (mddev->pers) { 2860 if (!mddev->pers->quiesce) 2861 return -EBUSY; 2862 if (mddev->recovery || mddev->sync_thread) 2863 return -EBUSY; 2864 /* we should be able to change the bitmap.. */ 2865 } 2866 2867 2868 if (fd >= 0) { 2869 if (mddev->bitmap) 2870 return -EEXIST; /* cannot add when bitmap is present */ 2871 mddev->bitmap_file = fget(fd); 2872 2873 if (mddev->bitmap_file == NULL) { 2874 printk(KERN_ERR "%s: error: failed to get bitmap file\n", 2875 mdname(mddev)); 2876 return -EBADF; 2877 } 2878 2879 err = deny_bitmap_write_access(mddev->bitmap_file); 2880 if (err) { 2881 printk(KERN_ERR "%s: error: bitmap file is already in use\n", 2882 mdname(mddev)); 2883 fput(mddev->bitmap_file); 2884 mddev->bitmap_file = NULL; 2885 return err; 2886 } 2887 mddev->bitmap_offset = 0; /* file overrides offset */ 2888 } else if (mddev->bitmap == NULL) 2889 return -ENOENT; /* cannot remove what isn't there */ 2890 err = 0; 2891 if (mddev->pers) { 2892 mddev->pers->quiesce(mddev, 1); 2893 if (fd >= 0) 2894 err = bitmap_create(mddev); 2895 if (fd < 0 || err) 2896 bitmap_destroy(mddev); 2897 mddev->pers->quiesce(mddev, 0); 2898 } else if (fd < 0) { 2899 if (mddev->bitmap_file) 2900 fput(mddev->bitmap_file); 2901 mddev->bitmap_file = NULL; 2902 } 2903 2904 return err; 2905 } 2906 2907 /* 2908 * set_array_info is used two different ways 2909 * The original usage is when creating a new array. 2910 * In this usage, raid_disks is > 0 and it together with 2911 * level, size, not_persistent,layout,chunksize determine the 2912 * shape of the array. 2913 * This will always create an array with a type-0.90.0 superblock. 2914 * The newer usage is when assembling an array. 2915 * In this case raid_disks will be 0, and the major_version field is 2916 * use to determine which style super-blocks are to be found on the devices. 2917 * The minor and patch _version numbers are also kept incase the 2918 * super_block handler wishes to interpret them. 2919 */ 2920 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) 2921 { 2922 2923 if (info->raid_disks == 0) { 2924 /* just setting version number for superblock loading */ 2925 if (info->major_version < 0 || 2926 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || 2927 super_types[info->major_version].name == NULL) { 2928 /* maybe try to auto-load a module? */ 2929 printk(KERN_INFO 2930 "md: superblock version %d not known\n", 2931 info->major_version); 2932 return -EINVAL; 2933 } 2934 mddev->major_version = info->major_version; 2935 mddev->minor_version = info->minor_version; 2936 mddev->patch_version = info->patch_version; 2937 return 0; 2938 } 2939 mddev->major_version = MD_MAJOR_VERSION; 2940 mddev->minor_version = MD_MINOR_VERSION; 2941 mddev->patch_version = MD_PATCHLEVEL_VERSION; 2942 mddev->ctime = get_seconds(); 2943 2944 mddev->level = info->level; 2945 mddev->size = info->size; 2946 mddev->raid_disks = info->raid_disks; 2947 /* don't set md_minor, it is determined by which /dev/md* was 2948 * openned 2949 */ 2950 if (info->state & (1<<MD_SB_CLEAN)) 2951 mddev->recovery_cp = MaxSector; 2952 else 2953 mddev->recovery_cp = 0; 2954 mddev->persistent = ! info->not_persistent; 2955 2956 mddev->layout = info->layout; 2957 mddev->chunk_size = info->chunk_size; 2958 2959 mddev->max_disks = MD_SB_DISKS; 2960 2961 mddev->sb_dirty = 1; 2962 2963 mddev->default_bitmap_offset = MD_SB_BYTES >> 9; 2964 mddev->bitmap_offset = 0; 2965 2966 /* 2967 * Generate a 128 bit UUID 2968 */ 2969 get_random_bytes(mddev->uuid, 16); 2970 2971 return 0; 2972 } 2973 2974 /* 2975 * update_array_info is used to change the configuration of an 2976 * on-line array. 2977 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 2978 * fields in the info are checked against the array. 2979 * Any differences that cannot be handled will cause an error. 2980 * Normally, only one change can be managed at a time. 2981 */ 2982 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) 2983 { 2984 int rv = 0; 2985 int cnt = 0; 2986 int state = 0; 2987 2988 /* calculate expected state,ignoring low bits */ 2989 if (mddev->bitmap && mddev->bitmap_offset) 2990 state |= (1 << MD_SB_BITMAP_PRESENT); 2991 2992 if (mddev->major_version != info->major_version || 2993 mddev->minor_version != info->minor_version || 2994 /* mddev->patch_version != info->patch_version || */ 2995 mddev->ctime != info->ctime || 2996 mddev->level != info->level || 2997 /* mddev->layout != info->layout || */ 2998 !mddev->persistent != info->not_persistent|| 2999 mddev->chunk_size != info->chunk_size || 3000 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 3001 ((state^info->state) & 0xfffffe00) 3002 ) 3003 return -EINVAL; 3004 /* Check there is only one change */ 3005 if (mddev->size != info->size) cnt++; 3006 if (mddev->raid_disks != info->raid_disks) cnt++; 3007 if (mddev->layout != info->layout) cnt++; 3008 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; 3009 if (cnt == 0) return 0; 3010 if (cnt > 1) return -EINVAL; 3011 3012 if (mddev->layout != info->layout) { 3013 /* Change layout 3014 * we don't need to do anything at the md level, the 3015 * personality will take care of it all. 3016 */ 3017 if (mddev->pers->reconfig == NULL) 3018 return -EINVAL; 3019 else 3020 return mddev->pers->reconfig(mddev, info->layout, -1); 3021 } 3022 if (mddev->size != info->size) { 3023 mdk_rdev_t * rdev; 3024 struct list_head *tmp; 3025 if (mddev->pers->resize == NULL) 3026 return -EINVAL; 3027 /* The "size" is the amount of each device that is used. 3028 * This can only make sense for arrays with redundancy. 3029 * linear and raid0 always use whatever space is available 3030 * We can only consider changing the size if no resync 3031 * or reconstruction is happening, and if the new size 3032 * is acceptable. It must fit before the sb_offset or, 3033 * if that is <data_offset, it must fit before the 3034 * size of each device. 3035 * If size is zero, we find the largest size that fits. 3036 */ 3037 if (mddev->sync_thread) 3038 return -EBUSY; 3039 ITERATE_RDEV(mddev,rdev,tmp) { 3040 sector_t avail; 3041 int fit = (info->size == 0); 3042 if (rdev->sb_offset > rdev->data_offset) 3043 avail = (rdev->sb_offset*2) - rdev->data_offset; 3044 else 3045 avail = get_capacity(rdev->bdev->bd_disk) 3046 - rdev->data_offset; 3047 if (fit && (info->size == 0 || info->size > avail/2)) 3048 info->size = avail/2; 3049 if (avail < ((sector_t)info->size << 1)) 3050 return -ENOSPC; 3051 } 3052 rv = mddev->pers->resize(mddev, (sector_t)info->size *2); 3053 if (!rv) { 3054 struct block_device *bdev; 3055 3056 bdev = bdget_disk(mddev->gendisk, 0); 3057 if (bdev) { 3058 down(&bdev->bd_inode->i_sem); 3059 i_size_write(bdev->bd_inode, mddev->array_size << 10); 3060 up(&bdev->bd_inode->i_sem); 3061 bdput(bdev); 3062 } 3063 } 3064 } 3065 if (mddev->raid_disks != info->raid_disks) { 3066 /* change the number of raid disks */ 3067 if (mddev->pers->reshape == NULL) 3068 return -EINVAL; 3069 if (info->raid_disks <= 0 || 3070 info->raid_disks >= mddev->max_disks) 3071 return -EINVAL; 3072 if (mddev->sync_thread) 3073 return -EBUSY; 3074 rv = mddev->pers->reshape(mddev, info->raid_disks); 3075 if (!rv) { 3076 struct block_device *bdev; 3077 3078 bdev = bdget_disk(mddev->gendisk, 0); 3079 if (bdev) { 3080 down(&bdev->bd_inode->i_sem); 3081 i_size_write(bdev->bd_inode, mddev->array_size << 10); 3082 up(&bdev->bd_inode->i_sem); 3083 bdput(bdev); 3084 } 3085 } 3086 } 3087 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 3088 if (mddev->pers->quiesce == NULL) 3089 return -EINVAL; 3090 if (mddev->recovery || mddev->sync_thread) 3091 return -EBUSY; 3092 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 3093 /* add the bitmap */ 3094 if (mddev->bitmap) 3095 return -EEXIST; 3096 if (mddev->default_bitmap_offset == 0) 3097 return -EINVAL; 3098 mddev->bitmap_offset = mddev->default_bitmap_offset; 3099 mddev->pers->quiesce(mddev, 1); 3100 rv = bitmap_create(mddev); 3101 if (rv) 3102 bitmap_destroy(mddev); 3103 mddev->pers->quiesce(mddev, 0); 3104 } else { 3105 /* remove the bitmap */ 3106 if (!mddev->bitmap) 3107 return -ENOENT; 3108 if (mddev->bitmap->file) 3109 return -EINVAL; 3110 mddev->pers->quiesce(mddev, 1); 3111 bitmap_destroy(mddev); 3112 mddev->pers->quiesce(mddev, 0); 3113 mddev->bitmap_offset = 0; 3114 } 3115 } 3116 md_update_sb(mddev); 3117 return rv; 3118 } 3119 3120 static int set_disk_faulty(mddev_t *mddev, dev_t dev) 3121 { 3122 mdk_rdev_t *rdev; 3123 3124 if (mddev->pers == NULL) 3125 return -ENODEV; 3126 3127 rdev = find_rdev(mddev, dev); 3128 if (!rdev) 3129 return -ENODEV; 3130 3131 md_error(mddev, rdev); 3132 return 0; 3133 } 3134 3135 static int md_ioctl(struct inode *inode, struct file *file, 3136 unsigned int cmd, unsigned long arg) 3137 { 3138 int err = 0; 3139 void __user *argp = (void __user *)arg; 3140 struct hd_geometry __user *loc = argp; 3141 mddev_t *mddev = NULL; 3142 3143 if (!capable(CAP_SYS_ADMIN)) 3144 return -EACCES; 3145 3146 /* 3147 * Commands dealing with the RAID driver but not any 3148 * particular array: 3149 */ 3150 switch (cmd) 3151 { 3152 case RAID_VERSION: 3153 err = get_version(argp); 3154 goto done; 3155 3156 case PRINT_RAID_DEBUG: 3157 err = 0; 3158 md_print_devices(); 3159 goto done; 3160 3161 #ifndef MODULE 3162 case RAID_AUTORUN: 3163 err = 0; 3164 autostart_arrays(arg); 3165 goto done; 3166 #endif 3167 default:; 3168 } 3169 3170 /* 3171 * Commands creating/starting a new array: 3172 */ 3173 3174 mddev = inode->i_bdev->bd_disk->private_data; 3175 3176 if (!mddev) { 3177 BUG(); 3178 goto abort; 3179 } 3180 3181 3182 if (cmd == START_ARRAY) { 3183 /* START_ARRAY doesn't need to lock the array as autostart_array 3184 * does the locking, and it could even be a different array 3185 */ 3186 static int cnt = 3; 3187 if (cnt > 0 ) { 3188 printk(KERN_WARNING 3189 "md: %s(pid %d) used deprecated START_ARRAY ioctl. " 3190 "This will not be supported beyond July 2006\n", 3191 current->comm, current->pid); 3192 cnt--; 3193 } 3194 err = autostart_array(new_decode_dev(arg)); 3195 if (err) { 3196 printk(KERN_WARNING "md: autostart failed!\n"); 3197 goto abort; 3198 } 3199 goto done; 3200 } 3201 3202 err = mddev_lock(mddev); 3203 if (err) { 3204 printk(KERN_INFO 3205 "md: ioctl lock interrupted, reason %d, cmd %d\n", 3206 err, cmd); 3207 goto abort; 3208 } 3209 3210 switch (cmd) 3211 { 3212 case SET_ARRAY_INFO: 3213 { 3214 mdu_array_info_t info; 3215 if (!arg) 3216 memset(&info, 0, sizeof(info)); 3217 else if (copy_from_user(&info, argp, sizeof(info))) { 3218 err = -EFAULT; 3219 goto abort_unlock; 3220 } 3221 if (mddev->pers) { 3222 err = update_array_info(mddev, &info); 3223 if (err) { 3224 printk(KERN_WARNING "md: couldn't update" 3225 " array info. %d\n", err); 3226 goto abort_unlock; 3227 } 3228 goto done_unlock; 3229 } 3230 if (!list_empty(&mddev->disks)) { 3231 printk(KERN_WARNING 3232 "md: array %s already has disks!\n", 3233 mdname(mddev)); 3234 err = -EBUSY; 3235 goto abort_unlock; 3236 } 3237 if (mddev->raid_disks) { 3238 printk(KERN_WARNING 3239 "md: array %s already initialised!\n", 3240 mdname(mddev)); 3241 err = -EBUSY; 3242 goto abort_unlock; 3243 } 3244 err = set_array_info(mddev, &info); 3245 if (err) { 3246 printk(KERN_WARNING "md: couldn't set" 3247 " array info. %d\n", err); 3248 goto abort_unlock; 3249 } 3250 } 3251 goto done_unlock; 3252 3253 default:; 3254 } 3255 3256 /* 3257 * Commands querying/configuring an existing array: 3258 */ 3259 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 3260 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ 3261 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 3262 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { 3263 err = -ENODEV; 3264 goto abort_unlock; 3265 } 3266 3267 /* 3268 * Commands even a read-only array can execute: 3269 */ 3270 switch (cmd) 3271 { 3272 case GET_ARRAY_INFO: 3273 err = get_array_info(mddev, argp); 3274 goto done_unlock; 3275 3276 case GET_BITMAP_FILE: 3277 err = get_bitmap_file(mddev, argp); 3278 goto done_unlock; 3279 3280 case GET_DISK_INFO: 3281 err = get_disk_info(mddev, argp); 3282 goto done_unlock; 3283 3284 case RESTART_ARRAY_RW: 3285 err = restart_array(mddev); 3286 goto done_unlock; 3287 3288 case STOP_ARRAY: 3289 err = do_md_stop (mddev, 0); 3290 goto done_unlock; 3291 3292 case STOP_ARRAY_RO: 3293 err = do_md_stop (mddev, 1); 3294 goto done_unlock; 3295 3296 /* 3297 * We have a problem here : there is no easy way to give a CHS 3298 * virtual geometry. We currently pretend that we have a 2 heads 3299 * 4 sectors (with a BIG number of cylinders...). This drives 3300 * dosfs just mad... ;-) 3301 */ 3302 case HDIO_GETGEO: 3303 if (!loc) { 3304 err = -EINVAL; 3305 goto abort_unlock; 3306 } 3307 err = put_user (2, (char __user *) &loc->heads); 3308 if (err) 3309 goto abort_unlock; 3310 err = put_user (4, (char __user *) &loc->sectors); 3311 if (err) 3312 goto abort_unlock; 3313 err = put_user(get_capacity(mddev->gendisk)/8, 3314 (short __user *) &loc->cylinders); 3315 if (err) 3316 goto abort_unlock; 3317 err = put_user (get_start_sect(inode->i_bdev), 3318 (long __user *) &loc->start); 3319 goto done_unlock; 3320 } 3321 3322 /* 3323 * The remaining ioctls are changing the state of the 3324 * superblock, so we do not allow them on read-only arrays. 3325 * However non-MD ioctls (e.g. get-size) will still come through 3326 * here and hit the 'default' below, so only disallow 3327 * 'md' ioctls, and switch to rw mode if started auto-readonly. 3328 */ 3329 if (_IOC_TYPE(cmd) == MD_MAJOR && 3330 mddev->ro && mddev->pers) { 3331 if (mddev->ro == 2) { 3332 mddev->ro = 0; 3333 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3334 md_wakeup_thread(mddev->thread); 3335 3336 } else { 3337 err = -EROFS; 3338 goto abort_unlock; 3339 } 3340 } 3341 3342 switch (cmd) 3343 { 3344 case ADD_NEW_DISK: 3345 { 3346 mdu_disk_info_t info; 3347 if (copy_from_user(&info, argp, sizeof(info))) 3348 err = -EFAULT; 3349 else 3350 err = add_new_disk(mddev, &info); 3351 goto done_unlock; 3352 } 3353 3354 case HOT_REMOVE_DISK: 3355 err = hot_remove_disk(mddev, new_decode_dev(arg)); 3356 goto done_unlock; 3357 3358 case HOT_ADD_DISK: 3359 err = hot_add_disk(mddev, new_decode_dev(arg)); 3360 goto done_unlock; 3361 3362 case SET_DISK_FAULTY: 3363 err = set_disk_faulty(mddev, new_decode_dev(arg)); 3364 goto done_unlock; 3365 3366 case RUN_ARRAY: 3367 err = do_md_run (mddev); 3368 goto done_unlock; 3369 3370 case SET_BITMAP_FILE: 3371 err = set_bitmap_file(mddev, (int)arg); 3372 goto done_unlock; 3373 3374 default: 3375 if (_IOC_TYPE(cmd) == MD_MAJOR) 3376 printk(KERN_WARNING "md: %s(pid %d) used" 3377 " obsolete MD ioctl, upgrade your" 3378 " software to use new ictls.\n", 3379 current->comm, current->pid); 3380 err = -EINVAL; 3381 goto abort_unlock; 3382 } 3383 3384 done_unlock: 3385 abort_unlock: 3386 mddev_unlock(mddev); 3387 3388 return err; 3389 done: 3390 if (err) 3391 MD_BUG(); 3392 abort: 3393 return err; 3394 } 3395 3396 static int md_open(struct inode *inode, struct file *file) 3397 { 3398 /* 3399 * Succeed if we can lock the mddev, which confirms that 3400 * it isn't being stopped right now. 3401 */ 3402 mddev_t *mddev = inode->i_bdev->bd_disk->private_data; 3403 int err; 3404 3405 if ((err = mddev_lock(mddev))) 3406 goto out; 3407 3408 err = 0; 3409 mddev_get(mddev); 3410 mddev_unlock(mddev); 3411 3412 check_disk_change(inode->i_bdev); 3413 out: 3414 return err; 3415 } 3416 3417 static int md_release(struct inode *inode, struct file * file) 3418 { 3419 mddev_t *mddev = inode->i_bdev->bd_disk->private_data; 3420 3421 if (!mddev) 3422 BUG(); 3423 mddev_put(mddev); 3424 3425 return 0; 3426 } 3427 3428 static int md_media_changed(struct gendisk *disk) 3429 { 3430 mddev_t *mddev = disk->private_data; 3431 3432 return mddev->changed; 3433 } 3434 3435 static int md_revalidate(struct gendisk *disk) 3436 { 3437 mddev_t *mddev = disk->private_data; 3438 3439 mddev->changed = 0; 3440 return 0; 3441 } 3442 static struct block_device_operations md_fops = 3443 { 3444 .owner = THIS_MODULE, 3445 .open = md_open, 3446 .release = md_release, 3447 .ioctl = md_ioctl, 3448 .media_changed = md_media_changed, 3449 .revalidate_disk= md_revalidate, 3450 }; 3451 3452 static int md_thread(void * arg) 3453 { 3454 mdk_thread_t *thread = arg; 3455 3456 /* 3457 * md_thread is a 'system-thread', it's priority should be very 3458 * high. We avoid resource deadlocks individually in each 3459 * raid personality. (RAID5 does preallocation) We also use RR and 3460 * the very same RT priority as kswapd, thus we will never get 3461 * into a priority inversion deadlock. 3462 * 3463 * we definitely have to have equal or higher priority than 3464 * bdflush, otherwise bdflush will deadlock if there are too 3465 * many dirty RAID5 blocks. 3466 */ 3467 3468 allow_signal(SIGKILL); 3469 while (!kthread_should_stop()) { 3470 3471 /* We need to wait INTERRUPTIBLE so that 3472 * we don't add to the load-average. 3473 * That means we need to be sure no signals are 3474 * pending 3475 */ 3476 if (signal_pending(current)) 3477 flush_signals(current); 3478 3479 wait_event_interruptible_timeout 3480 (thread->wqueue, 3481 test_bit(THREAD_WAKEUP, &thread->flags) 3482 || kthread_should_stop(), 3483 thread->timeout); 3484 try_to_freeze(); 3485 3486 clear_bit(THREAD_WAKEUP, &thread->flags); 3487 3488 thread->run(thread->mddev); 3489 } 3490 3491 return 0; 3492 } 3493 3494 void md_wakeup_thread(mdk_thread_t *thread) 3495 { 3496 if (thread) { 3497 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); 3498 set_bit(THREAD_WAKEUP, &thread->flags); 3499 wake_up(&thread->wqueue); 3500 } 3501 } 3502 3503 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, 3504 const char *name) 3505 { 3506 mdk_thread_t *thread; 3507 3508 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL); 3509 if (!thread) 3510 return NULL; 3511 3512 memset(thread, 0, sizeof(mdk_thread_t)); 3513 init_waitqueue_head(&thread->wqueue); 3514 3515 thread->run = run; 3516 thread->mddev = mddev; 3517 thread->timeout = MAX_SCHEDULE_TIMEOUT; 3518 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); 3519 if (IS_ERR(thread->tsk)) { 3520 kfree(thread); 3521 return NULL; 3522 } 3523 return thread; 3524 } 3525 3526 void md_unregister_thread(mdk_thread_t *thread) 3527 { 3528 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); 3529 3530 kthread_stop(thread->tsk); 3531 kfree(thread); 3532 } 3533 3534 void md_error(mddev_t *mddev, mdk_rdev_t *rdev) 3535 { 3536 if (!mddev) { 3537 MD_BUG(); 3538 return; 3539 } 3540 3541 if (!rdev || test_bit(Faulty, &rdev->flags)) 3542 return; 3543 /* 3544 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", 3545 mdname(mddev), 3546 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), 3547 __builtin_return_address(0),__builtin_return_address(1), 3548 __builtin_return_address(2),__builtin_return_address(3)); 3549 */ 3550 if (!mddev->pers->error_handler) 3551 return; 3552 mddev->pers->error_handler(mddev,rdev); 3553 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 3554 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3555 md_wakeup_thread(mddev->thread); 3556 md_new_event(mddev); 3557 } 3558 3559 /* seq_file implementation /proc/mdstat */ 3560 3561 static void status_unused(struct seq_file *seq) 3562 { 3563 int i = 0; 3564 mdk_rdev_t *rdev; 3565 struct list_head *tmp; 3566 3567 seq_printf(seq, "unused devices: "); 3568 3569 ITERATE_RDEV_PENDING(rdev,tmp) { 3570 char b[BDEVNAME_SIZE]; 3571 i++; 3572 seq_printf(seq, "%s ", 3573 bdevname(rdev->bdev,b)); 3574 } 3575 if (!i) 3576 seq_printf(seq, "<none>"); 3577 3578 seq_printf(seq, "\n"); 3579 } 3580 3581 3582 static void status_resync(struct seq_file *seq, mddev_t * mddev) 3583 { 3584 unsigned long max_blocks, resync, res, dt, db, rt; 3585 3586 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; 3587 3588 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 3589 max_blocks = mddev->resync_max_sectors >> 1; 3590 else 3591 max_blocks = mddev->size; 3592 3593 /* 3594 * Should not happen. 3595 */ 3596 if (!max_blocks) { 3597 MD_BUG(); 3598 return; 3599 } 3600 res = (resync/1024)*1000/(max_blocks/1024 + 1); 3601 { 3602 int i, x = res/50, y = 20-x; 3603 seq_printf(seq, "["); 3604 for (i = 0; i < x; i++) 3605 seq_printf(seq, "="); 3606 seq_printf(seq, ">"); 3607 for (i = 0; i < y; i++) 3608 seq_printf(seq, "."); 3609 seq_printf(seq, "] "); 3610 } 3611 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", 3612 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 3613 "resync" : "recovery"), 3614 res/10, res % 10, resync, max_blocks); 3615 3616 /* 3617 * We do not want to overflow, so the order of operands and 3618 * the * 100 / 100 trick are important. We do a +1 to be 3619 * safe against division by zero. We only estimate anyway. 3620 * 3621 * dt: time from mark until now 3622 * db: blocks written from mark until now 3623 * rt: remaining time 3624 */ 3625 dt = ((jiffies - mddev->resync_mark) / HZ); 3626 if (!dt) dt++; 3627 db = resync - (mddev->resync_mark_cnt/2); 3628 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; 3629 3630 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); 3631 3632 seq_printf(seq, " speed=%ldK/sec", db/dt); 3633 } 3634 3635 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 3636 { 3637 struct list_head *tmp; 3638 loff_t l = *pos; 3639 mddev_t *mddev; 3640 3641 if (l >= 0x10000) 3642 return NULL; 3643 if (!l--) 3644 /* header */ 3645 return (void*)1; 3646 3647 spin_lock(&all_mddevs_lock); 3648 list_for_each(tmp,&all_mddevs) 3649 if (!l--) { 3650 mddev = list_entry(tmp, mddev_t, all_mddevs); 3651 mddev_get(mddev); 3652 spin_unlock(&all_mddevs_lock); 3653 return mddev; 3654 } 3655 spin_unlock(&all_mddevs_lock); 3656 if (!l--) 3657 return (void*)2;/* tail */ 3658 return NULL; 3659 } 3660 3661 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3662 { 3663 struct list_head *tmp; 3664 mddev_t *next_mddev, *mddev = v; 3665 3666 ++*pos; 3667 if (v == (void*)2) 3668 return NULL; 3669 3670 spin_lock(&all_mddevs_lock); 3671 if (v == (void*)1) 3672 tmp = all_mddevs.next; 3673 else 3674 tmp = mddev->all_mddevs.next; 3675 if (tmp != &all_mddevs) 3676 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); 3677 else { 3678 next_mddev = (void*)2; 3679 *pos = 0x10000; 3680 } 3681 spin_unlock(&all_mddevs_lock); 3682 3683 if (v != (void*)1) 3684 mddev_put(mddev); 3685 return next_mddev; 3686 3687 } 3688 3689 static void md_seq_stop(struct seq_file *seq, void *v) 3690 { 3691 mddev_t *mddev = v; 3692 3693 if (mddev && v != (void*)1 && v != (void*)2) 3694 mddev_put(mddev); 3695 } 3696 3697 struct mdstat_info { 3698 int event; 3699 }; 3700 3701 static int md_seq_show(struct seq_file *seq, void *v) 3702 { 3703 mddev_t *mddev = v; 3704 sector_t size; 3705 struct list_head *tmp2; 3706 mdk_rdev_t *rdev; 3707 struct mdstat_info *mi = seq->private; 3708 int i; 3709 struct bitmap *bitmap; 3710 3711 if (v == (void*)1) { 3712 seq_printf(seq, "Personalities : "); 3713 spin_lock(&pers_lock); 3714 for (i = 0; i < MAX_PERSONALITY; i++) 3715 if (pers[i]) 3716 seq_printf(seq, "[%s] ", pers[i]->name); 3717 3718 spin_unlock(&pers_lock); 3719 seq_printf(seq, "\n"); 3720 mi->event = atomic_read(&md_event_count); 3721 return 0; 3722 } 3723 if (v == (void*)2) { 3724 status_unused(seq); 3725 return 0; 3726 } 3727 3728 if (mddev_lock(mddev)!=0) 3729 return -EINTR; 3730 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 3731 seq_printf(seq, "%s : %sactive", mdname(mddev), 3732 mddev->pers ? "" : "in"); 3733 if (mddev->pers) { 3734 if (mddev->ro==1) 3735 seq_printf(seq, " (read-only)"); 3736 if (mddev->ro==2) 3737 seq_printf(seq, "(auto-read-only)"); 3738 seq_printf(seq, " %s", mddev->pers->name); 3739 } 3740 3741 size = 0; 3742 ITERATE_RDEV(mddev,rdev,tmp2) { 3743 char b[BDEVNAME_SIZE]; 3744 seq_printf(seq, " %s[%d]", 3745 bdevname(rdev->bdev,b), rdev->desc_nr); 3746 if (test_bit(WriteMostly, &rdev->flags)) 3747 seq_printf(seq, "(W)"); 3748 if (test_bit(Faulty, &rdev->flags)) { 3749 seq_printf(seq, "(F)"); 3750 continue; 3751 } else if (rdev->raid_disk < 0) 3752 seq_printf(seq, "(S)"); /* spare */ 3753 size += rdev->size; 3754 } 3755 3756 if (!list_empty(&mddev->disks)) { 3757 if (mddev->pers) 3758 seq_printf(seq, "\n %llu blocks", 3759 (unsigned long long)mddev->array_size); 3760 else 3761 seq_printf(seq, "\n %llu blocks", 3762 (unsigned long long)size); 3763 } 3764 if (mddev->persistent) { 3765 if (mddev->major_version != 0 || 3766 mddev->minor_version != 90) { 3767 seq_printf(seq," super %d.%d", 3768 mddev->major_version, 3769 mddev->minor_version); 3770 } 3771 } else 3772 seq_printf(seq, " super non-persistent"); 3773 3774 if (mddev->pers) { 3775 mddev->pers->status (seq, mddev); 3776 seq_printf(seq, "\n "); 3777 if (mddev->pers->sync_request) { 3778 if (mddev->curr_resync > 2) { 3779 status_resync (seq, mddev); 3780 seq_printf(seq, "\n "); 3781 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) 3782 seq_printf(seq, "\tresync=DELAYED\n "); 3783 else if (mddev->recovery_cp < MaxSector) 3784 seq_printf(seq, "\tresync=PENDING\n "); 3785 } 3786 } else 3787 seq_printf(seq, "\n "); 3788 3789 if ((bitmap = mddev->bitmap)) { 3790 unsigned long chunk_kb; 3791 unsigned long flags; 3792 spin_lock_irqsave(&bitmap->lock, flags); 3793 chunk_kb = bitmap->chunksize >> 10; 3794 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " 3795 "%lu%s chunk", 3796 bitmap->pages - bitmap->missing_pages, 3797 bitmap->pages, 3798 (bitmap->pages - bitmap->missing_pages) 3799 << (PAGE_SHIFT - 10), 3800 chunk_kb ? chunk_kb : bitmap->chunksize, 3801 chunk_kb ? "KB" : "B"); 3802 if (bitmap->file) { 3803 seq_printf(seq, ", file: "); 3804 seq_path(seq, bitmap->file->f_vfsmnt, 3805 bitmap->file->f_dentry," \t\n"); 3806 } 3807 3808 seq_printf(seq, "\n"); 3809 spin_unlock_irqrestore(&bitmap->lock, flags); 3810 } 3811 3812 seq_printf(seq, "\n"); 3813 } 3814 mddev_unlock(mddev); 3815 3816 return 0; 3817 } 3818 3819 static struct seq_operations md_seq_ops = { 3820 .start = md_seq_start, 3821 .next = md_seq_next, 3822 .stop = md_seq_stop, 3823 .show = md_seq_show, 3824 }; 3825 3826 static int md_seq_open(struct inode *inode, struct file *file) 3827 { 3828 int error; 3829 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); 3830 if (mi == NULL) 3831 return -ENOMEM; 3832 3833 error = seq_open(file, &md_seq_ops); 3834 if (error) 3835 kfree(mi); 3836 else { 3837 struct seq_file *p = file->private_data; 3838 p->private = mi; 3839 mi->event = atomic_read(&md_event_count); 3840 } 3841 return error; 3842 } 3843 3844 static int md_seq_release(struct inode *inode, struct file *file) 3845 { 3846 struct seq_file *m = file->private_data; 3847 struct mdstat_info *mi = m->private; 3848 m->private = NULL; 3849 kfree(mi); 3850 return seq_release(inode, file); 3851 } 3852 3853 static unsigned int mdstat_poll(struct file *filp, poll_table *wait) 3854 { 3855 struct seq_file *m = filp->private_data; 3856 struct mdstat_info *mi = m->private; 3857 int mask; 3858 3859 poll_wait(filp, &md_event_waiters, wait); 3860 3861 /* always allow read */ 3862 mask = POLLIN | POLLRDNORM; 3863 3864 if (mi->event != atomic_read(&md_event_count)) 3865 mask |= POLLERR | POLLPRI; 3866 return mask; 3867 } 3868 3869 static struct file_operations md_seq_fops = { 3870 .open = md_seq_open, 3871 .read = seq_read, 3872 .llseek = seq_lseek, 3873 .release = md_seq_release, 3874 .poll = mdstat_poll, 3875 }; 3876 3877 int register_md_personality(int pnum, mdk_personality_t *p) 3878 { 3879 if (pnum >= MAX_PERSONALITY) { 3880 printk(KERN_ERR 3881 "md: tried to install personality %s as nr %d, but max is %lu\n", 3882 p->name, pnum, MAX_PERSONALITY-1); 3883 return -EINVAL; 3884 } 3885 3886 spin_lock(&pers_lock); 3887 if (pers[pnum]) { 3888 spin_unlock(&pers_lock); 3889 return -EBUSY; 3890 } 3891 3892 pers[pnum] = p; 3893 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum); 3894 spin_unlock(&pers_lock); 3895 return 0; 3896 } 3897 3898 int unregister_md_personality(int pnum) 3899 { 3900 if (pnum >= MAX_PERSONALITY) 3901 return -EINVAL; 3902 3903 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name); 3904 spin_lock(&pers_lock); 3905 pers[pnum] = NULL; 3906 spin_unlock(&pers_lock); 3907 return 0; 3908 } 3909 3910 static int is_mddev_idle(mddev_t *mddev) 3911 { 3912 mdk_rdev_t * rdev; 3913 struct list_head *tmp; 3914 int idle; 3915 unsigned long curr_events; 3916 3917 idle = 1; 3918 ITERATE_RDEV(mddev,rdev,tmp) { 3919 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 3920 curr_events = disk_stat_read(disk, sectors[0]) + 3921 disk_stat_read(disk, sectors[1]) - 3922 atomic_read(&disk->sync_io); 3923 /* The difference between curr_events and last_events 3924 * will be affected by any new non-sync IO (making 3925 * curr_events bigger) and any difference in the amount of 3926 * in-flight syncio (making current_events bigger or smaller) 3927 * The amount in-flight is currently limited to 3928 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 3929 * which is at most 4096 sectors. 3930 * These numbers are fairly fragile and should be made 3931 * more robust, probably by enforcing the 3932 * 'window size' that md_do_sync sort-of uses. 3933 * 3934 * Note: the following is an unsigned comparison. 3935 */ 3936 if ((curr_events - rdev->last_events + 4096) > 8192) { 3937 rdev->last_events = curr_events; 3938 idle = 0; 3939 } 3940 } 3941 return idle; 3942 } 3943 3944 void md_done_sync(mddev_t *mddev, int blocks, int ok) 3945 { 3946 /* another "blocks" (512byte) blocks have been synced */ 3947 atomic_sub(blocks, &mddev->recovery_active); 3948 wake_up(&mddev->recovery_wait); 3949 if (!ok) { 3950 set_bit(MD_RECOVERY_ERR, &mddev->recovery); 3951 md_wakeup_thread(mddev->thread); 3952 // stop recovery, signal do_sync .... 3953 } 3954 } 3955 3956 3957 /* md_write_start(mddev, bi) 3958 * If we need to update some array metadata (e.g. 'active' flag 3959 * in superblock) before writing, schedule a superblock update 3960 * and wait for it to complete. 3961 */ 3962 void md_write_start(mddev_t *mddev, struct bio *bi) 3963 { 3964 if (bio_data_dir(bi) != WRITE) 3965 return; 3966 3967 BUG_ON(mddev->ro == 1); 3968 if (mddev->ro == 2) { 3969 /* need to switch to read/write */ 3970 mddev->ro = 0; 3971 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3972 md_wakeup_thread(mddev->thread); 3973 } 3974 atomic_inc(&mddev->writes_pending); 3975 if (mddev->in_sync) { 3976 spin_lock_irq(&mddev->write_lock); 3977 if (mddev->in_sync) { 3978 mddev->in_sync = 0; 3979 mddev->sb_dirty = 1; 3980 md_wakeup_thread(mddev->thread); 3981 } 3982 spin_unlock_irq(&mddev->write_lock); 3983 } 3984 wait_event(mddev->sb_wait, mddev->sb_dirty==0); 3985 } 3986 3987 void md_write_end(mddev_t *mddev) 3988 { 3989 if (atomic_dec_and_test(&mddev->writes_pending)) { 3990 if (mddev->safemode == 2) 3991 md_wakeup_thread(mddev->thread); 3992 else 3993 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 3994 } 3995 } 3996 3997 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 3998 3999 #define SYNC_MARKS 10 4000 #define SYNC_MARK_STEP (3*HZ) 4001 static void md_do_sync(mddev_t *mddev) 4002 { 4003 mddev_t *mddev2; 4004 unsigned int currspeed = 0, 4005 window; 4006 sector_t max_sectors,j, io_sectors; 4007 unsigned long mark[SYNC_MARKS]; 4008 sector_t mark_cnt[SYNC_MARKS]; 4009 int last_mark,m; 4010 struct list_head *tmp; 4011 sector_t last_check; 4012 int skipped = 0; 4013 4014 /* just incase thread restarts... */ 4015 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 4016 return; 4017 4018 /* we overload curr_resync somewhat here. 4019 * 0 == not engaged in resync at all 4020 * 2 == checking that there is no conflict with another sync 4021 * 1 == like 2, but have yielded to allow conflicting resync to 4022 * commense 4023 * other == active in resync - this many blocks 4024 * 4025 * Before starting a resync we must have set curr_resync to 4026 * 2, and then checked that every "conflicting" array has curr_resync 4027 * less than ours. When we find one that is the same or higher 4028 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 4029 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 4030 * This will mean we have to start checking from the beginning again. 4031 * 4032 */ 4033 4034 do { 4035 mddev->curr_resync = 2; 4036 4037 try_again: 4038 if (kthread_should_stop()) { 4039 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4040 goto skip; 4041 } 4042 ITERATE_MDDEV(mddev2,tmp) { 4043 if (mddev2 == mddev) 4044 continue; 4045 if (mddev2->curr_resync && 4046 match_mddev_units(mddev,mddev2)) { 4047 DEFINE_WAIT(wq); 4048 if (mddev < mddev2 && mddev->curr_resync == 2) { 4049 /* arbitrarily yield */ 4050 mddev->curr_resync = 1; 4051 wake_up(&resync_wait); 4052 } 4053 if (mddev > mddev2 && mddev->curr_resync == 1) 4054 /* no need to wait here, we can wait the next 4055 * time 'round when curr_resync == 2 4056 */ 4057 continue; 4058 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); 4059 if (!kthread_should_stop() && 4060 mddev2->curr_resync >= mddev->curr_resync) { 4061 printk(KERN_INFO "md: delaying resync of %s" 4062 " until %s has finished resync (they" 4063 " share one or more physical units)\n", 4064 mdname(mddev), mdname(mddev2)); 4065 mddev_put(mddev2); 4066 schedule(); 4067 finish_wait(&resync_wait, &wq); 4068 goto try_again; 4069 } 4070 finish_wait(&resync_wait, &wq); 4071 } 4072 } 4073 } while (mddev->curr_resync < 2); 4074 4075 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 4076 /* resync follows the size requested by the personality, 4077 * which defaults to physical size, but can be virtual size 4078 */ 4079 max_sectors = mddev->resync_max_sectors; 4080 mddev->resync_mismatches = 0; 4081 } else 4082 /* recovery follows the physical size of devices */ 4083 max_sectors = mddev->size << 1; 4084 4085 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); 4086 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" 4087 " %d KB/sec/disc.\n", sysctl_speed_limit_min); 4088 printk(KERN_INFO "md: using maximum available idle IO bandwidth " 4089 "(but not more than %d KB/sec) for reconstruction.\n", 4090 sysctl_speed_limit_max); 4091 4092 is_mddev_idle(mddev); /* this also initializes IO event counters */ 4093 /* we don't use the checkpoint if there's a bitmap */ 4094 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap 4095 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 4096 j = mddev->recovery_cp; 4097 else 4098 j = 0; 4099 io_sectors = 0; 4100 for (m = 0; m < SYNC_MARKS; m++) { 4101 mark[m] = jiffies; 4102 mark_cnt[m] = io_sectors; 4103 } 4104 last_mark = 0; 4105 mddev->resync_mark = mark[last_mark]; 4106 mddev->resync_mark_cnt = mark_cnt[last_mark]; 4107 4108 /* 4109 * Tune reconstruction: 4110 */ 4111 window = 32*(PAGE_SIZE/512); 4112 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", 4113 window/2,(unsigned long long) max_sectors/2); 4114 4115 atomic_set(&mddev->recovery_active, 0); 4116 init_waitqueue_head(&mddev->recovery_wait); 4117 last_check = 0; 4118 4119 if (j>2) { 4120 printk(KERN_INFO 4121 "md: resuming recovery of %s from checkpoint.\n", 4122 mdname(mddev)); 4123 mddev->curr_resync = j; 4124 } 4125 4126 while (j < max_sectors) { 4127 sector_t sectors; 4128 4129 skipped = 0; 4130 sectors = mddev->pers->sync_request(mddev, j, &skipped, 4131 currspeed < sysctl_speed_limit_min); 4132 if (sectors == 0) { 4133 set_bit(MD_RECOVERY_ERR, &mddev->recovery); 4134 goto out; 4135 } 4136 4137 if (!skipped) { /* actual IO requested */ 4138 io_sectors += sectors; 4139 atomic_add(sectors, &mddev->recovery_active); 4140 } 4141 4142 j += sectors; 4143 if (j>1) mddev->curr_resync = j; 4144 if (last_check == 0) 4145 /* this is the earliers that rebuilt will be 4146 * visible in /proc/mdstat 4147 */ 4148 md_new_event(mddev); 4149 4150 if (last_check + window > io_sectors || j == max_sectors) 4151 continue; 4152 4153 last_check = io_sectors; 4154 4155 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || 4156 test_bit(MD_RECOVERY_ERR, &mddev->recovery)) 4157 break; 4158 4159 repeat: 4160 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 4161 /* step marks */ 4162 int next = (last_mark+1) % SYNC_MARKS; 4163 4164 mddev->resync_mark = mark[next]; 4165 mddev->resync_mark_cnt = mark_cnt[next]; 4166 mark[next] = jiffies; 4167 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 4168 last_mark = next; 4169 } 4170 4171 4172 if (kthread_should_stop()) { 4173 /* 4174 * got a signal, exit. 4175 */ 4176 printk(KERN_INFO 4177 "md: md_do_sync() got signal ... exiting\n"); 4178 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4179 goto out; 4180 } 4181 4182 /* 4183 * this loop exits only if either when we are slower than 4184 * the 'hard' speed limit, or the system was IO-idle for 4185 * a jiffy. 4186 * the system might be non-idle CPU-wise, but we only care 4187 * about not overloading the IO subsystem. (things like an 4188 * e2fsck being done on the RAID array should execute fast) 4189 */ 4190 mddev->queue->unplug_fn(mddev->queue); 4191 cond_resched(); 4192 4193 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 4194 /((jiffies-mddev->resync_mark)/HZ +1) +1; 4195 4196 if (currspeed > sysctl_speed_limit_min) { 4197 if ((currspeed > sysctl_speed_limit_max) || 4198 !is_mddev_idle(mddev)) { 4199 msleep(500); 4200 goto repeat; 4201 } 4202 } 4203 } 4204 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); 4205 /* 4206 * this also signals 'finished resyncing' to md_stop 4207 */ 4208 out: 4209 mddev->queue->unplug_fn(mddev->queue); 4210 4211 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 4212 4213 /* tell personality that we are finished */ 4214 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); 4215 4216 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && 4217 mddev->curr_resync > 2 && 4218 mddev->curr_resync >= mddev->recovery_cp) { 4219 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 4220 printk(KERN_INFO 4221 "md: checkpointing recovery of %s.\n", 4222 mdname(mddev)); 4223 mddev->recovery_cp = mddev->curr_resync; 4224 } else 4225 mddev->recovery_cp = MaxSector; 4226 } 4227 4228 skip: 4229 mddev->curr_resync = 0; 4230 wake_up(&resync_wait); 4231 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 4232 md_wakeup_thread(mddev->thread); 4233 } 4234 4235 4236 /* 4237 * This routine is regularly called by all per-raid-array threads to 4238 * deal with generic issues like resync and super-block update. 4239 * Raid personalities that don't have a thread (linear/raid0) do not 4240 * need this as they never do any recovery or update the superblock. 4241 * 4242 * It does not do any resync itself, but rather "forks" off other threads 4243 * to do that as needed. 4244 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 4245 * "->recovery" and create a thread at ->sync_thread. 4246 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) 4247 * and wakeups up this thread which will reap the thread and finish up. 4248 * This thread also removes any faulty devices (with nr_pending == 0). 4249 * 4250 * The overall approach is: 4251 * 1/ if the superblock needs updating, update it. 4252 * 2/ If a recovery thread is running, don't do anything else. 4253 * 3/ If recovery has finished, clean up, possibly marking spares active. 4254 * 4/ If there are any faulty devices, remove them. 4255 * 5/ If array is degraded, try to add spares devices 4256 * 6/ If array has spares or is not in-sync, start a resync thread. 4257 */ 4258 void md_check_recovery(mddev_t *mddev) 4259 { 4260 mdk_rdev_t *rdev; 4261 struct list_head *rtmp; 4262 4263 4264 if (mddev->bitmap) 4265 bitmap_daemon_work(mddev->bitmap); 4266 4267 if (mddev->ro) 4268 return; 4269 4270 if (signal_pending(current)) { 4271 if (mddev->pers->sync_request) { 4272 printk(KERN_INFO "md: %s in immediate safe mode\n", 4273 mdname(mddev)); 4274 mddev->safemode = 2; 4275 } 4276 flush_signals(current); 4277 } 4278 4279 if ( ! ( 4280 mddev->sb_dirty || 4281 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 4282 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 4283 (mddev->safemode == 1) || 4284 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 4285 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 4286 )) 4287 return; 4288 4289 if (mddev_trylock(mddev)==0) { 4290 int spares =0; 4291 4292 spin_lock_irq(&mddev->write_lock); 4293 if (mddev->safemode && !atomic_read(&mddev->writes_pending) && 4294 !mddev->in_sync && mddev->recovery_cp == MaxSector) { 4295 mddev->in_sync = 1; 4296 mddev->sb_dirty = 1; 4297 } 4298 if (mddev->safemode == 1) 4299 mddev->safemode = 0; 4300 spin_unlock_irq(&mddev->write_lock); 4301 4302 if (mddev->sb_dirty) 4303 md_update_sb(mddev); 4304 4305 4306 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 4307 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 4308 /* resync/recovery still happening */ 4309 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4310 goto unlock; 4311 } 4312 if (mddev->sync_thread) { 4313 /* resync has finished, collect result */ 4314 md_unregister_thread(mddev->sync_thread); 4315 mddev->sync_thread = NULL; 4316 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && 4317 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 4318 /* success...*/ 4319 /* activate any spares */ 4320 mddev->pers->spare_active(mddev); 4321 } 4322 md_update_sb(mddev); 4323 4324 /* if array is no-longer degraded, then any saved_raid_disk 4325 * information must be scrapped 4326 */ 4327 if (!mddev->degraded) 4328 ITERATE_RDEV(mddev,rdev,rtmp) 4329 rdev->saved_raid_disk = -1; 4330 4331 mddev->recovery = 0; 4332 /* flag recovery needed just to double check */ 4333 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4334 md_new_event(mddev); 4335 goto unlock; 4336 } 4337 /* Clear some bits that don't mean anything, but 4338 * might be left set 4339 */ 4340 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4341 clear_bit(MD_RECOVERY_ERR, &mddev->recovery); 4342 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 4343 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 4344 4345 /* no recovery is running. 4346 * remove any failed drives, then 4347 * add spares if possible. 4348 * Spare are also removed and re-added, to allow 4349 * the personality to fail the re-add. 4350 */ 4351 ITERATE_RDEV(mddev,rdev,rtmp) 4352 if (rdev->raid_disk >= 0 && 4353 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && 4354 atomic_read(&rdev->nr_pending)==0) { 4355 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { 4356 char nm[20]; 4357 sprintf(nm,"rd%d", rdev->raid_disk); 4358 sysfs_remove_link(&mddev->kobj, nm); 4359 rdev->raid_disk = -1; 4360 } 4361 } 4362 4363 if (mddev->degraded) { 4364 ITERATE_RDEV(mddev,rdev,rtmp) 4365 if (rdev->raid_disk < 0 4366 && !test_bit(Faulty, &rdev->flags)) { 4367 if (mddev->pers->hot_add_disk(mddev,rdev)) { 4368 char nm[20]; 4369 sprintf(nm, "rd%d", rdev->raid_disk); 4370 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 4371 spares++; 4372 md_new_event(mddev); 4373 } else 4374 break; 4375 } 4376 } 4377 4378 if (spares) { 4379 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4380 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4381 } else if (mddev->recovery_cp < MaxSector) { 4382 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4383 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 4384 /* nothing to be done ... */ 4385 goto unlock; 4386 4387 if (mddev->pers->sync_request) { 4388 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 4389 if (spares && mddev->bitmap && ! mddev->bitmap->file) { 4390 /* We are adding a device or devices to an array 4391 * which has the bitmap stored on all devices. 4392 * So make sure all bitmap pages get written 4393 */ 4394 bitmap_write_all(mddev->bitmap); 4395 } 4396 mddev->sync_thread = md_register_thread(md_do_sync, 4397 mddev, 4398 "%s_resync"); 4399 if (!mddev->sync_thread) { 4400 printk(KERN_ERR "%s: could not start resync" 4401 " thread...\n", 4402 mdname(mddev)); 4403 /* leave the spares where they are, it shouldn't hurt */ 4404 mddev->recovery = 0; 4405 } else 4406 md_wakeup_thread(mddev->sync_thread); 4407 md_new_event(mddev); 4408 } 4409 unlock: 4410 mddev_unlock(mddev); 4411 } 4412 } 4413 4414 static int md_notify_reboot(struct notifier_block *this, 4415 unsigned long code, void *x) 4416 { 4417 struct list_head *tmp; 4418 mddev_t *mddev; 4419 4420 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { 4421 4422 printk(KERN_INFO "md: stopping all md devices.\n"); 4423 4424 ITERATE_MDDEV(mddev,tmp) 4425 if (mddev_trylock(mddev)==0) 4426 do_md_stop (mddev, 1); 4427 /* 4428 * certain more exotic SCSI devices are known to be 4429 * volatile wrt too early system reboots. While the 4430 * right place to handle this issue is the given 4431 * driver, we do want to have a safe RAID driver ... 4432 */ 4433 mdelay(1000*1); 4434 } 4435 return NOTIFY_DONE; 4436 } 4437 4438 static struct notifier_block md_notifier = { 4439 .notifier_call = md_notify_reboot, 4440 .next = NULL, 4441 .priority = INT_MAX, /* before any real devices */ 4442 }; 4443 4444 static void md_geninit(void) 4445 { 4446 struct proc_dir_entry *p; 4447 4448 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 4449 4450 p = create_proc_entry("mdstat", S_IRUGO, NULL); 4451 if (p) 4452 p->proc_fops = &md_seq_fops; 4453 } 4454 4455 static int __init md_init(void) 4456 { 4457 int minor; 4458 4459 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," 4460 " MD_SB_DISKS=%d\n", 4461 MD_MAJOR_VERSION, MD_MINOR_VERSION, 4462 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); 4463 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, 4464 BITMAP_MINOR); 4465 4466 if (register_blkdev(MAJOR_NR, "md")) 4467 return -1; 4468 if ((mdp_major=register_blkdev(0, "mdp"))<=0) { 4469 unregister_blkdev(MAJOR_NR, "md"); 4470 return -1; 4471 } 4472 devfs_mk_dir("md"); 4473 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, 4474 md_probe, NULL, NULL); 4475 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, 4476 md_probe, NULL, NULL); 4477 4478 for (minor=0; minor < MAX_MD_DEVS; ++minor) 4479 devfs_mk_bdev(MKDEV(MAJOR_NR, minor), 4480 S_IFBLK|S_IRUSR|S_IWUSR, 4481 "md/%d", minor); 4482 4483 for (minor=0; minor < MAX_MD_DEVS; ++minor) 4484 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), 4485 S_IFBLK|S_IRUSR|S_IWUSR, 4486 "md/mdp%d", minor); 4487 4488 4489 register_reboot_notifier(&md_notifier); 4490 raid_table_header = register_sysctl_table(raid_root_table, 1); 4491 4492 md_geninit(); 4493 return (0); 4494 } 4495 4496 4497 #ifndef MODULE 4498 4499 /* 4500 * Searches all registered partitions for autorun RAID arrays 4501 * at boot time. 4502 */ 4503 static dev_t detected_devices[128]; 4504 static int dev_cnt; 4505 4506 void md_autodetect_dev(dev_t dev) 4507 { 4508 if (dev_cnt >= 0 && dev_cnt < 127) 4509 detected_devices[dev_cnt++] = dev; 4510 } 4511 4512 4513 static void autostart_arrays(int part) 4514 { 4515 mdk_rdev_t *rdev; 4516 int i; 4517 4518 printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); 4519 4520 for (i = 0; i < dev_cnt; i++) { 4521 dev_t dev = detected_devices[i]; 4522 4523 rdev = md_import_device(dev,0, 0); 4524 if (IS_ERR(rdev)) 4525 continue; 4526 4527 if (test_bit(Faulty, &rdev->flags)) { 4528 MD_BUG(); 4529 continue; 4530 } 4531 list_add(&rdev->same_set, &pending_raid_disks); 4532 } 4533 dev_cnt = 0; 4534 4535 autorun_devices(part); 4536 } 4537 4538 #endif 4539 4540 static __exit void md_exit(void) 4541 { 4542 mddev_t *mddev; 4543 struct list_head *tmp; 4544 int i; 4545 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); 4546 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); 4547 for (i=0; i < MAX_MD_DEVS; i++) 4548 devfs_remove("md/%d", i); 4549 for (i=0; i < MAX_MD_DEVS; i++) 4550 devfs_remove("md/d%d", i); 4551 4552 devfs_remove("md"); 4553 4554 unregister_blkdev(MAJOR_NR,"md"); 4555 unregister_blkdev(mdp_major, "mdp"); 4556 unregister_reboot_notifier(&md_notifier); 4557 unregister_sysctl_table(raid_table_header); 4558 remove_proc_entry("mdstat", NULL); 4559 ITERATE_MDDEV(mddev,tmp) { 4560 struct gendisk *disk = mddev->gendisk; 4561 if (!disk) 4562 continue; 4563 export_array(mddev); 4564 del_gendisk(disk); 4565 put_disk(disk); 4566 mddev->gendisk = NULL; 4567 mddev_put(mddev); 4568 } 4569 } 4570 4571 module_init(md_init) 4572 module_exit(md_exit) 4573 4574 static int get_ro(char *buffer, struct kernel_param *kp) 4575 { 4576 return sprintf(buffer, "%d", start_readonly); 4577 } 4578 static int set_ro(const char *val, struct kernel_param *kp) 4579 { 4580 char *e; 4581 int num = simple_strtoul(val, &e, 10); 4582 if (*val && (*e == '\0' || *e == '\n')) { 4583 start_readonly = num; 4584 return 0;; 4585 } 4586 return -EINVAL; 4587 } 4588 4589 module_param_call(start_ro, set_ro, get_ro, NULL, 0600); 4590 module_param(start_dirty_degraded, int, 0644); 4591 4592 4593 EXPORT_SYMBOL(register_md_personality); 4594 EXPORT_SYMBOL(unregister_md_personality); 4595 EXPORT_SYMBOL(md_error); 4596 EXPORT_SYMBOL(md_done_sync); 4597 EXPORT_SYMBOL(md_write_start); 4598 EXPORT_SYMBOL(md_write_end); 4599 EXPORT_SYMBOL(md_register_thread); 4600 EXPORT_SYMBOL(md_unregister_thread); 4601 EXPORT_SYMBOL(md_wakeup_thread); 4602 EXPORT_SYMBOL(md_print_devices); 4603 EXPORT_SYMBOL(md_check_recovery); 4604 MODULE_LICENSE("GPL"); 4605 MODULE_ALIAS("md"); 4606 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 4607