1 /* 2 md.c : Multiple Devices driver for Linux 3 Copyright (C) 1998, 1999, 2000 Ingo Molnar 4 5 completely rewritten, based on the MD driver code from Marc Zyngier 6 7 Changes: 8 9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar 10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> 11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> 12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su> 13 - kmod support by: Cyrus Durgin 14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> 15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> 16 17 - lots of fixes and improvements to the RAID1/RAID5 and generic 18 RAID code (such as request based resynchronization): 19 20 Neil Brown <neilb@cse.unsw.edu.au>. 21 22 - persistent bitmap code 23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. 24 25 This program is free software; you can redistribute it and/or modify 26 it under the terms of the GNU General Public License as published by 27 the Free Software Foundation; either version 2, or (at your option) 28 any later version. 29 30 You should have received a copy of the GNU General Public License 31 (for example /usr/src/linux/COPYING); if not, write to the Free 32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/config.h> 37 #include <linux/kthread.h> 38 #include <linux/linkage.h> 39 #include <linux/raid/md.h> 40 #include <linux/raid/bitmap.h> 41 #include <linux/sysctl.h> 42 #include <linux/devfs_fs_kernel.h> 43 #include <linux/buffer_head.h> /* for invalidate_bdev */ 44 #include <linux/suspend.h> 45 46 #include <linux/init.h> 47 48 #include <linux/file.h> 49 50 #ifdef CONFIG_KMOD 51 #include <linux/kmod.h> 52 #endif 53 54 #include <asm/unaligned.h> 55 56 #define MAJOR_NR MD_MAJOR 57 #define MD_DRIVER 58 59 /* 63 partitions with the alternate major number (mdp) */ 60 #define MdpMinorShift 6 61 62 #define DEBUG 0 63 #define dprintk(x...) ((void)(DEBUG && printk(x))) 64 65 66 #ifndef MODULE 67 static void autostart_arrays (int part); 68 #endif 69 70 static mdk_personality_t *pers[MAX_PERSONALITY]; 71 static DEFINE_SPINLOCK(pers_lock); 72 73 /* 74 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 75 * is 1000 KB/sec, so the extra system load does not show up that much. 76 * Increase it if you want to have more _guaranteed_ speed. Note that 77 * the RAID driver will use the maximum available bandwidth if the IO 78 * subsystem is idle. There is also an 'absolute maximum' reconstruction 79 * speed limit - in case reconstruction slows down your system despite 80 * idle IO detection. 81 * 82 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 83 */ 84 85 static int sysctl_speed_limit_min = 1000; 86 static int sysctl_speed_limit_max = 200000; 87 88 static struct ctl_table_header *raid_table_header; 89 90 static ctl_table raid_table[] = { 91 { 92 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, 93 .procname = "speed_limit_min", 94 .data = &sysctl_speed_limit_min, 95 .maxlen = sizeof(int), 96 .mode = 0644, 97 .proc_handler = &proc_dointvec, 98 }, 99 { 100 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, 101 .procname = "speed_limit_max", 102 .data = &sysctl_speed_limit_max, 103 .maxlen = sizeof(int), 104 .mode = 0644, 105 .proc_handler = &proc_dointvec, 106 }, 107 { .ctl_name = 0 } 108 }; 109 110 static ctl_table raid_dir_table[] = { 111 { 112 .ctl_name = DEV_RAID, 113 .procname = "raid", 114 .maxlen = 0, 115 .mode = 0555, 116 .child = raid_table, 117 }, 118 { .ctl_name = 0 } 119 }; 120 121 static ctl_table raid_root_table[] = { 122 { 123 .ctl_name = CTL_DEV, 124 .procname = "dev", 125 .maxlen = 0, 126 .mode = 0555, 127 .child = raid_dir_table, 128 }, 129 { .ctl_name = 0 } 130 }; 131 132 static struct block_device_operations md_fops; 133 134 static int start_readonly; 135 136 /* 137 * Enables to iterate over all existing md arrays 138 * all_mddevs_lock protects this list. 139 */ 140 static LIST_HEAD(all_mddevs); 141 static DEFINE_SPINLOCK(all_mddevs_lock); 142 143 144 /* 145 * iterates through all used mddevs in the system. 146 * We take care to grab the all_mddevs_lock whenever navigating 147 * the list, and to always hold a refcount when unlocked. 148 * Any code which breaks out of this loop while own 149 * a reference to the current mddev and must mddev_put it. 150 */ 151 #define ITERATE_MDDEV(mddev,tmp) \ 152 \ 153 for (({ spin_lock(&all_mddevs_lock); \ 154 tmp = all_mddevs.next; \ 155 mddev = NULL;}); \ 156 ({ if (tmp != &all_mddevs) \ 157 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ 158 spin_unlock(&all_mddevs_lock); \ 159 if (mddev) mddev_put(mddev); \ 160 mddev = list_entry(tmp, mddev_t, all_mddevs); \ 161 tmp != &all_mddevs;}); \ 162 ({ spin_lock(&all_mddevs_lock); \ 163 tmp = tmp->next;}) \ 164 ) 165 166 167 static int md_fail_request (request_queue_t *q, struct bio *bio) 168 { 169 bio_io_error(bio, bio->bi_size); 170 return 0; 171 } 172 173 static inline mddev_t *mddev_get(mddev_t *mddev) 174 { 175 atomic_inc(&mddev->active); 176 return mddev; 177 } 178 179 static void mddev_put(mddev_t *mddev) 180 { 181 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 182 return; 183 if (!mddev->raid_disks && list_empty(&mddev->disks)) { 184 list_del(&mddev->all_mddevs); 185 blk_put_queue(mddev->queue); 186 kobject_unregister(&mddev->kobj); 187 } 188 spin_unlock(&all_mddevs_lock); 189 } 190 191 static mddev_t * mddev_find(dev_t unit) 192 { 193 mddev_t *mddev, *new = NULL; 194 195 retry: 196 spin_lock(&all_mddevs_lock); 197 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 198 if (mddev->unit == unit) { 199 mddev_get(mddev); 200 spin_unlock(&all_mddevs_lock); 201 kfree(new); 202 return mddev; 203 } 204 205 if (new) { 206 list_add(&new->all_mddevs, &all_mddevs); 207 spin_unlock(&all_mddevs_lock); 208 return new; 209 } 210 spin_unlock(&all_mddevs_lock); 211 212 new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL); 213 if (!new) 214 return NULL; 215 216 memset(new, 0, sizeof(*new)); 217 218 new->unit = unit; 219 if (MAJOR(unit) == MD_MAJOR) 220 new->md_minor = MINOR(unit); 221 else 222 new->md_minor = MINOR(unit) >> MdpMinorShift; 223 224 init_MUTEX(&new->reconfig_sem); 225 INIT_LIST_HEAD(&new->disks); 226 INIT_LIST_HEAD(&new->all_mddevs); 227 init_timer(&new->safemode_timer); 228 atomic_set(&new->active, 1); 229 spin_lock_init(&new->write_lock); 230 init_waitqueue_head(&new->sb_wait); 231 232 new->queue = blk_alloc_queue(GFP_KERNEL); 233 if (!new->queue) { 234 kfree(new); 235 return NULL; 236 } 237 238 blk_queue_make_request(new->queue, md_fail_request); 239 240 goto retry; 241 } 242 243 static inline int mddev_lock(mddev_t * mddev) 244 { 245 return down_interruptible(&mddev->reconfig_sem); 246 } 247 248 static inline void mddev_lock_uninterruptible(mddev_t * mddev) 249 { 250 down(&mddev->reconfig_sem); 251 } 252 253 static inline int mddev_trylock(mddev_t * mddev) 254 { 255 return down_trylock(&mddev->reconfig_sem); 256 } 257 258 static inline void mddev_unlock(mddev_t * mddev) 259 { 260 up(&mddev->reconfig_sem); 261 262 md_wakeup_thread(mddev->thread); 263 } 264 265 mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) 266 { 267 mdk_rdev_t * rdev; 268 struct list_head *tmp; 269 270 ITERATE_RDEV(mddev,rdev,tmp) { 271 if (rdev->desc_nr == nr) 272 return rdev; 273 } 274 return NULL; 275 } 276 277 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) 278 { 279 struct list_head *tmp; 280 mdk_rdev_t *rdev; 281 282 ITERATE_RDEV(mddev,rdev,tmp) { 283 if (rdev->bdev->bd_dev == dev) 284 return rdev; 285 } 286 return NULL; 287 } 288 289 static inline sector_t calc_dev_sboffset(struct block_device *bdev) 290 { 291 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 292 return MD_NEW_SIZE_BLOCKS(size); 293 } 294 295 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) 296 { 297 sector_t size; 298 299 size = rdev->sb_offset; 300 301 if (chunk_size) 302 size &= ~((sector_t)chunk_size/1024 - 1); 303 return size; 304 } 305 306 static int alloc_disk_sb(mdk_rdev_t * rdev) 307 { 308 if (rdev->sb_page) 309 MD_BUG(); 310 311 rdev->sb_page = alloc_page(GFP_KERNEL); 312 if (!rdev->sb_page) { 313 printk(KERN_ALERT "md: out of memory.\n"); 314 return -EINVAL; 315 } 316 317 return 0; 318 } 319 320 static void free_disk_sb(mdk_rdev_t * rdev) 321 { 322 if (rdev->sb_page) { 323 page_cache_release(rdev->sb_page); 324 rdev->sb_loaded = 0; 325 rdev->sb_page = NULL; 326 rdev->sb_offset = 0; 327 rdev->size = 0; 328 } 329 } 330 331 332 static int super_written(struct bio *bio, unsigned int bytes_done, int error) 333 { 334 mdk_rdev_t *rdev = bio->bi_private; 335 mddev_t *mddev = rdev->mddev; 336 if (bio->bi_size) 337 return 1; 338 339 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) 340 md_error(mddev, rdev); 341 342 if (atomic_dec_and_test(&mddev->pending_writes)) 343 wake_up(&mddev->sb_wait); 344 bio_put(bio); 345 return 0; 346 } 347 348 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) 349 { 350 struct bio *bio2 = bio->bi_private; 351 mdk_rdev_t *rdev = bio2->bi_private; 352 mddev_t *mddev = rdev->mddev; 353 if (bio->bi_size) 354 return 1; 355 356 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && 357 error == -EOPNOTSUPP) { 358 unsigned long flags; 359 /* barriers don't appear to be supported :-( */ 360 set_bit(BarriersNotsupp, &rdev->flags); 361 mddev->barriers_work = 0; 362 spin_lock_irqsave(&mddev->write_lock, flags); 363 bio2->bi_next = mddev->biolist; 364 mddev->biolist = bio2; 365 spin_unlock_irqrestore(&mddev->write_lock, flags); 366 wake_up(&mddev->sb_wait); 367 bio_put(bio); 368 return 0; 369 } 370 bio_put(bio2); 371 bio->bi_private = rdev; 372 return super_written(bio, bytes_done, error); 373 } 374 375 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, 376 sector_t sector, int size, struct page *page) 377 { 378 /* write first size bytes of page to sector of rdev 379 * Increment mddev->pending_writes before returning 380 * and decrement it on completion, waking up sb_wait 381 * if zero is reached. 382 * If an error occurred, call md_error 383 * 384 * As we might need to resubmit the request if BIO_RW_BARRIER 385 * causes ENOTSUPP, we allocate a spare bio... 386 */ 387 struct bio *bio = bio_alloc(GFP_NOIO, 1); 388 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); 389 390 bio->bi_bdev = rdev->bdev; 391 bio->bi_sector = sector; 392 bio_add_page(bio, page, size, 0); 393 bio->bi_private = rdev; 394 bio->bi_end_io = super_written; 395 bio->bi_rw = rw; 396 397 atomic_inc(&mddev->pending_writes); 398 if (!test_bit(BarriersNotsupp, &rdev->flags)) { 399 struct bio *rbio; 400 rw |= (1<<BIO_RW_BARRIER); 401 rbio = bio_clone(bio, GFP_NOIO); 402 rbio->bi_private = bio; 403 rbio->bi_end_io = super_written_barrier; 404 submit_bio(rw, rbio); 405 } else 406 submit_bio(rw, bio); 407 } 408 409 void md_super_wait(mddev_t *mddev) 410 { 411 /* wait for all superblock writes that were scheduled to complete. 412 * if any had to be retried (due to BARRIER problems), retry them 413 */ 414 DEFINE_WAIT(wq); 415 for(;;) { 416 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); 417 if (atomic_read(&mddev->pending_writes)==0) 418 break; 419 while (mddev->biolist) { 420 struct bio *bio; 421 spin_lock_irq(&mddev->write_lock); 422 bio = mddev->biolist; 423 mddev->biolist = bio->bi_next ; 424 bio->bi_next = NULL; 425 spin_unlock_irq(&mddev->write_lock); 426 submit_bio(bio->bi_rw, bio); 427 } 428 schedule(); 429 } 430 finish_wait(&mddev->sb_wait, &wq); 431 } 432 433 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) 434 { 435 if (bio->bi_size) 436 return 1; 437 438 complete((struct completion*)bio->bi_private); 439 return 0; 440 } 441 442 int sync_page_io(struct block_device *bdev, sector_t sector, int size, 443 struct page *page, int rw) 444 { 445 struct bio *bio = bio_alloc(GFP_NOIO, 1); 446 struct completion event; 447 int ret; 448 449 rw |= (1 << BIO_RW_SYNC); 450 451 bio->bi_bdev = bdev; 452 bio->bi_sector = sector; 453 bio_add_page(bio, page, size, 0); 454 init_completion(&event); 455 bio->bi_private = &event; 456 bio->bi_end_io = bi_complete; 457 submit_bio(rw, bio); 458 wait_for_completion(&event); 459 460 ret = test_bit(BIO_UPTODATE, &bio->bi_flags); 461 bio_put(bio); 462 return ret; 463 } 464 465 static int read_disk_sb(mdk_rdev_t * rdev, int size) 466 { 467 char b[BDEVNAME_SIZE]; 468 if (!rdev->sb_page) { 469 MD_BUG(); 470 return -EINVAL; 471 } 472 if (rdev->sb_loaded) 473 return 0; 474 475 476 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) 477 goto fail; 478 rdev->sb_loaded = 1; 479 return 0; 480 481 fail: 482 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", 483 bdevname(rdev->bdev,b)); 484 return -EINVAL; 485 } 486 487 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 488 { 489 if ( (sb1->set_uuid0 == sb2->set_uuid0) && 490 (sb1->set_uuid1 == sb2->set_uuid1) && 491 (sb1->set_uuid2 == sb2->set_uuid2) && 492 (sb1->set_uuid3 == sb2->set_uuid3)) 493 494 return 1; 495 496 return 0; 497 } 498 499 500 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 501 { 502 int ret; 503 mdp_super_t *tmp1, *tmp2; 504 505 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 506 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 507 508 if (!tmp1 || !tmp2) { 509 ret = 0; 510 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); 511 goto abort; 512 } 513 514 *tmp1 = *sb1; 515 *tmp2 = *sb2; 516 517 /* 518 * nr_disks is not constant 519 */ 520 tmp1->nr_disks = 0; 521 tmp2->nr_disks = 0; 522 523 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) 524 ret = 0; 525 else 526 ret = 1; 527 528 abort: 529 kfree(tmp1); 530 kfree(tmp2); 531 return ret; 532 } 533 534 static unsigned int calc_sb_csum(mdp_super_t * sb) 535 { 536 unsigned int disk_csum, csum; 537 538 disk_csum = sb->sb_csum; 539 sb->sb_csum = 0; 540 csum = csum_partial((void *)sb, MD_SB_BYTES, 0); 541 sb->sb_csum = disk_csum; 542 return csum; 543 } 544 545 546 /* 547 * Handle superblock details. 548 * We want to be able to handle multiple superblock formats 549 * so we have a common interface to them all, and an array of 550 * different handlers. 551 * We rely on user-space to write the initial superblock, and support 552 * reading and updating of superblocks. 553 * Interface methods are: 554 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) 555 * loads and validates a superblock on dev. 556 * if refdev != NULL, compare superblocks on both devices 557 * Return: 558 * 0 - dev has a superblock that is compatible with refdev 559 * 1 - dev has a superblock that is compatible and newer than refdev 560 * so dev should be used as the refdev in future 561 * -EINVAL superblock incompatible or invalid 562 * -othererror e.g. -EIO 563 * 564 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) 565 * Verify that dev is acceptable into mddev. 566 * The first time, mddev->raid_disks will be 0, and data from 567 * dev should be merged in. Subsequent calls check that dev 568 * is new enough. Return 0 or -EINVAL 569 * 570 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) 571 * Update the superblock for rdev with data in mddev 572 * This does not write to disc. 573 * 574 */ 575 576 struct super_type { 577 char *name; 578 struct module *owner; 579 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); 580 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); 581 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); 582 }; 583 584 /* 585 * load_super for 0.90.0 586 */ 587 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 588 { 589 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 590 mdp_super_t *sb; 591 int ret; 592 sector_t sb_offset; 593 594 /* 595 * Calculate the position of the superblock, 596 * it's at the end of the disk. 597 * 598 * It also happens to be a multiple of 4Kb. 599 */ 600 sb_offset = calc_dev_sboffset(rdev->bdev); 601 rdev->sb_offset = sb_offset; 602 603 ret = read_disk_sb(rdev, MD_SB_BYTES); 604 if (ret) return ret; 605 606 ret = -EINVAL; 607 608 bdevname(rdev->bdev, b); 609 sb = (mdp_super_t*)page_address(rdev->sb_page); 610 611 if (sb->md_magic != MD_SB_MAGIC) { 612 printk(KERN_ERR "md: invalid raid superblock magic on %s\n", 613 b); 614 goto abort; 615 } 616 617 if (sb->major_version != 0 || 618 sb->minor_version != 90) { 619 printk(KERN_WARNING "Bad version number %d.%d on %s\n", 620 sb->major_version, sb->minor_version, 621 b); 622 goto abort; 623 } 624 625 if (sb->raid_disks <= 0) 626 goto abort; 627 628 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { 629 printk(KERN_WARNING "md: invalid superblock checksum on %s\n", 630 b); 631 goto abort; 632 } 633 634 rdev->preferred_minor = sb->md_minor; 635 rdev->data_offset = 0; 636 rdev->sb_size = MD_SB_BYTES; 637 638 if (sb->level == LEVEL_MULTIPATH) 639 rdev->desc_nr = -1; 640 else 641 rdev->desc_nr = sb->this_disk.number; 642 643 if (refdev == 0) 644 ret = 1; 645 else { 646 __u64 ev1, ev2; 647 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); 648 if (!uuid_equal(refsb, sb)) { 649 printk(KERN_WARNING "md: %s has different UUID to %s\n", 650 b, bdevname(refdev->bdev,b2)); 651 goto abort; 652 } 653 if (!sb_equal(refsb, sb)) { 654 printk(KERN_WARNING "md: %s has same UUID" 655 " but different superblock to %s\n", 656 b, bdevname(refdev->bdev, b2)); 657 goto abort; 658 } 659 ev1 = md_event(sb); 660 ev2 = md_event(refsb); 661 if (ev1 > ev2) 662 ret = 1; 663 else 664 ret = 0; 665 } 666 rdev->size = calc_dev_size(rdev, sb->chunk_size); 667 668 abort: 669 return ret; 670 } 671 672 /* 673 * validate_super for 0.90.0 674 */ 675 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) 676 { 677 mdp_disk_t *desc; 678 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); 679 680 rdev->raid_disk = -1; 681 rdev->flags = 0; 682 if (mddev->raid_disks == 0) { 683 mddev->major_version = 0; 684 mddev->minor_version = sb->minor_version; 685 mddev->patch_version = sb->patch_version; 686 mddev->persistent = ! sb->not_persistent; 687 mddev->chunk_size = sb->chunk_size; 688 mddev->ctime = sb->ctime; 689 mddev->utime = sb->utime; 690 mddev->level = sb->level; 691 mddev->layout = sb->layout; 692 mddev->raid_disks = sb->raid_disks; 693 mddev->size = sb->size; 694 mddev->events = md_event(sb); 695 mddev->bitmap_offset = 0; 696 mddev->default_bitmap_offset = MD_SB_BYTES >> 9; 697 698 if (sb->state & (1<<MD_SB_CLEAN)) 699 mddev->recovery_cp = MaxSector; 700 else { 701 if (sb->events_hi == sb->cp_events_hi && 702 sb->events_lo == sb->cp_events_lo) { 703 mddev->recovery_cp = sb->recovery_cp; 704 } else 705 mddev->recovery_cp = 0; 706 } 707 708 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 709 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 710 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 711 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 712 713 mddev->max_disks = MD_SB_DISKS; 714 715 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 716 mddev->bitmap_file == NULL) { 717 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) { 718 /* FIXME use a better test */ 719 printk(KERN_WARNING "md: bitmaps only support for raid1\n"); 720 return -EINVAL; 721 } 722 mddev->bitmap_offset = mddev->default_bitmap_offset; 723 } 724 725 } else if (mddev->pers == NULL) { 726 /* Insist on good event counter while assembling */ 727 __u64 ev1 = md_event(sb); 728 ++ev1; 729 if (ev1 < mddev->events) 730 return -EINVAL; 731 } else if (mddev->bitmap) { 732 /* if adding to array with a bitmap, then we can accept an 733 * older device ... but not too old. 734 */ 735 __u64 ev1 = md_event(sb); 736 if (ev1 < mddev->bitmap->events_cleared) 737 return 0; 738 } else /* just a hot-add of a new device, leave raid_disk at -1 */ 739 return 0; 740 741 if (mddev->level != LEVEL_MULTIPATH) { 742 desc = sb->disks + rdev->desc_nr; 743 744 if (desc->state & (1<<MD_DISK_FAULTY)) 745 set_bit(Faulty, &rdev->flags); 746 else if (desc->state & (1<<MD_DISK_SYNC) && 747 desc->raid_disk < mddev->raid_disks) { 748 set_bit(In_sync, &rdev->flags); 749 rdev->raid_disk = desc->raid_disk; 750 } 751 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 752 set_bit(WriteMostly, &rdev->flags); 753 } else /* MULTIPATH are always insync */ 754 set_bit(In_sync, &rdev->flags); 755 return 0; 756 } 757 758 /* 759 * sync_super for 0.90.0 760 */ 761 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) 762 { 763 mdp_super_t *sb; 764 struct list_head *tmp; 765 mdk_rdev_t *rdev2; 766 int next_spare = mddev->raid_disks; 767 768 769 /* make rdev->sb match mddev data.. 770 * 771 * 1/ zero out disks 772 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 773 * 3/ any empty disks < next_spare become removed 774 * 775 * disks[0] gets initialised to REMOVED because 776 * we cannot be sure from other fields if it has 777 * been initialised or not. 778 */ 779 int i; 780 int active=0, working=0,failed=0,spare=0,nr_disks=0; 781 782 rdev->sb_size = MD_SB_BYTES; 783 784 sb = (mdp_super_t*)page_address(rdev->sb_page); 785 786 memset(sb, 0, sizeof(*sb)); 787 788 sb->md_magic = MD_SB_MAGIC; 789 sb->major_version = mddev->major_version; 790 sb->minor_version = mddev->minor_version; 791 sb->patch_version = mddev->patch_version; 792 sb->gvalid_words = 0; /* ignored */ 793 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 794 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 795 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 796 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 797 798 sb->ctime = mddev->ctime; 799 sb->level = mddev->level; 800 sb->size = mddev->size; 801 sb->raid_disks = mddev->raid_disks; 802 sb->md_minor = mddev->md_minor; 803 sb->not_persistent = !mddev->persistent; 804 sb->utime = mddev->utime; 805 sb->state = 0; 806 sb->events_hi = (mddev->events>>32); 807 sb->events_lo = (u32)mddev->events; 808 809 if (mddev->in_sync) 810 { 811 sb->recovery_cp = mddev->recovery_cp; 812 sb->cp_events_hi = (mddev->events>>32); 813 sb->cp_events_lo = (u32)mddev->events; 814 if (mddev->recovery_cp == MaxSector) 815 sb->state = (1<< MD_SB_CLEAN); 816 } else 817 sb->recovery_cp = 0; 818 819 sb->layout = mddev->layout; 820 sb->chunk_size = mddev->chunk_size; 821 822 if (mddev->bitmap && mddev->bitmap_file == NULL) 823 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 824 825 sb->disks[0].state = (1<<MD_DISK_REMOVED); 826 ITERATE_RDEV(mddev,rdev2,tmp) { 827 mdp_disk_t *d; 828 int desc_nr; 829 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) 830 && !test_bit(Faulty, &rdev2->flags)) 831 desc_nr = rdev2->raid_disk; 832 else 833 desc_nr = next_spare++; 834 rdev2->desc_nr = desc_nr; 835 d = &sb->disks[rdev2->desc_nr]; 836 nr_disks++; 837 d->number = rdev2->desc_nr; 838 d->major = MAJOR(rdev2->bdev->bd_dev); 839 d->minor = MINOR(rdev2->bdev->bd_dev); 840 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) 841 && !test_bit(Faulty, &rdev2->flags)) 842 d->raid_disk = rdev2->raid_disk; 843 else 844 d->raid_disk = rdev2->desc_nr; /* compatibility */ 845 if (test_bit(Faulty, &rdev2->flags)) { 846 d->state = (1<<MD_DISK_FAULTY); 847 failed++; 848 } else if (test_bit(In_sync, &rdev2->flags)) { 849 d->state = (1<<MD_DISK_ACTIVE); 850 d->state |= (1<<MD_DISK_SYNC); 851 active++; 852 working++; 853 } else { 854 d->state = 0; 855 spare++; 856 working++; 857 } 858 if (test_bit(WriteMostly, &rdev2->flags)) 859 d->state |= (1<<MD_DISK_WRITEMOSTLY); 860 } 861 /* now set the "removed" and "faulty" bits on any missing devices */ 862 for (i=0 ; i < mddev->raid_disks ; i++) { 863 mdp_disk_t *d = &sb->disks[i]; 864 if (d->state == 0 && d->number == 0) { 865 d->number = i; 866 d->raid_disk = i; 867 d->state = (1<<MD_DISK_REMOVED); 868 d->state |= (1<<MD_DISK_FAULTY); 869 failed++; 870 } 871 } 872 sb->nr_disks = nr_disks; 873 sb->active_disks = active; 874 sb->working_disks = working; 875 sb->failed_disks = failed; 876 sb->spare_disks = spare; 877 878 sb->this_disk = sb->disks[rdev->desc_nr]; 879 sb->sb_csum = calc_sb_csum(sb); 880 } 881 882 /* 883 * version 1 superblock 884 */ 885 886 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) 887 { 888 unsigned int disk_csum, csum; 889 unsigned long long newcsum; 890 int size = 256 + le32_to_cpu(sb->max_dev)*2; 891 unsigned int *isuper = (unsigned int*)sb; 892 int i; 893 894 disk_csum = sb->sb_csum; 895 sb->sb_csum = 0; 896 newcsum = 0; 897 for (i=0; size>=4; size -= 4 ) 898 newcsum += le32_to_cpu(*isuper++); 899 900 if (size == 2) 901 newcsum += le16_to_cpu(*(unsigned short*) isuper); 902 903 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 904 sb->sb_csum = disk_csum; 905 return cpu_to_le32(csum); 906 } 907 908 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 909 { 910 struct mdp_superblock_1 *sb; 911 int ret; 912 sector_t sb_offset; 913 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 914 int bmask; 915 916 /* 917 * Calculate the position of the superblock. 918 * It is always aligned to a 4K boundary and 919 * depeding on minor_version, it can be: 920 * 0: At least 8K, but less than 12K, from end of device 921 * 1: At start of device 922 * 2: 4K from start of device. 923 */ 924 switch(minor_version) { 925 case 0: 926 sb_offset = rdev->bdev->bd_inode->i_size >> 9; 927 sb_offset -= 8*2; 928 sb_offset &= ~(sector_t)(4*2-1); 929 /* convert from sectors to K */ 930 sb_offset /= 2; 931 break; 932 case 1: 933 sb_offset = 0; 934 break; 935 case 2: 936 sb_offset = 4; 937 break; 938 default: 939 return -EINVAL; 940 } 941 rdev->sb_offset = sb_offset; 942 943 /* superblock is rarely larger than 1K, but it can be larger, 944 * and it is safe to read 4k, so we do that 945 */ 946 ret = read_disk_sb(rdev, 4096); 947 if (ret) return ret; 948 949 950 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 951 952 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 953 sb->major_version != cpu_to_le32(1) || 954 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 955 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || 956 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 957 return -EINVAL; 958 959 if (calc_sb_1_csum(sb) != sb->sb_csum) { 960 printk("md: invalid superblock checksum on %s\n", 961 bdevname(rdev->bdev,b)); 962 return -EINVAL; 963 } 964 if (le64_to_cpu(sb->data_size) < 10) { 965 printk("md: data_size too small on %s\n", 966 bdevname(rdev->bdev,b)); 967 return -EINVAL; 968 } 969 rdev->preferred_minor = 0xffff; 970 rdev->data_offset = le64_to_cpu(sb->data_offset); 971 972 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 973 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; 974 if (rdev->sb_size & bmask) 975 rdev-> sb_size = (rdev->sb_size | bmask)+1; 976 977 if (refdev == 0) 978 return 1; 979 else { 980 __u64 ev1, ev2; 981 struct mdp_superblock_1 *refsb = 982 (struct mdp_superblock_1*)page_address(refdev->sb_page); 983 984 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 985 sb->level != refsb->level || 986 sb->layout != refsb->layout || 987 sb->chunksize != refsb->chunksize) { 988 printk(KERN_WARNING "md: %s has strangely different" 989 " superblock to %s\n", 990 bdevname(rdev->bdev,b), 991 bdevname(refdev->bdev,b2)); 992 return -EINVAL; 993 } 994 ev1 = le64_to_cpu(sb->events); 995 ev2 = le64_to_cpu(refsb->events); 996 997 if (ev1 > ev2) 998 return 1; 999 } 1000 if (minor_version) 1001 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; 1002 else 1003 rdev->size = rdev->sb_offset; 1004 if (rdev->size < le64_to_cpu(sb->data_size)/2) 1005 return -EINVAL; 1006 rdev->size = le64_to_cpu(sb->data_size)/2; 1007 if (le32_to_cpu(sb->chunksize)) 1008 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); 1009 return 0; 1010 } 1011 1012 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) 1013 { 1014 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1015 1016 rdev->raid_disk = -1; 1017 rdev->flags = 0; 1018 if (mddev->raid_disks == 0) { 1019 mddev->major_version = 1; 1020 mddev->patch_version = 0; 1021 mddev->persistent = 1; 1022 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; 1023 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); 1024 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); 1025 mddev->level = le32_to_cpu(sb->level); 1026 mddev->layout = le32_to_cpu(sb->layout); 1027 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1028 mddev->size = le64_to_cpu(sb->size)/2; 1029 mddev->events = le64_to_cpu(sb->events); 1030 mddev->bitmap_offset = 0; 1031 mddev->default_bitmap_offset = 0; 1032 mddev->default_bitmap_offset = 1024; 1033 1034 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1035 memcpy(mddev->uuid, sb->set_uuid, 16); 1036 1037 mddev->max_disks = (4096-256)/2; 1038 1039 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1040 mddev->bitmap_file == NULL ) { 1041 if (mddev->level != 1) { 1042 printk(KERN_WARNING "md: bitmaps only supported for raid1\n"); 1043 return -EINVAL; 1044 } 1045 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); 1046 } 1047 } else if (mddev->pers == NULL) { 1048 /* Insist of good event counter while assembling */ 1049 __u64 ev1 = le64_to_cpu(sb->events); 1050 ++ev1; 1051 if (ev1 < mddev->events) 1052 return -EINVAL; 1053 } else if (mddev->bitmap) { 1054 /* If adding to array with a bitmap, then we can accept an 1055 * older device, but not too old. 1056 */ 1057 __u64 ev1 = le64_to_cpu(sb->events); 1058 if (ev1 < mddev->bitmap->events_cleared) 1059 return 0; 1060 } else /* just a hot-add of a new device, leave raid_disk at -1 */ 1061 return 0; 1062 1063 if (mddev->level != LEVEL_MULTIPATH) { 1064 int role; 1065 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1066 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1067 switch(role) { 1068 case 0xffff: /* spare */ 1069 break; 1070 case 0xfffe: /* faulty */ 1071 set_bit(Faulty, &rdev->flags); 1072 break; 1073 default: 1074 set_bit(In_sync, &rdev->flags); 1075 rdev->raid_disk = role; 1076 break; 1077 } 1078 if (sb->devflags & WriteMostly1) 1079 set_bit(WriteMostly, &rdev->flags); 1080 } else /* MULTIPATH are always insync */ 1081 set_bit(In_sync, &rdev->flags); 1082 1083 return 0; 1084 } 1085 1086 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) 1087 { 1088 struct mdp_superblock_1 *sb; 1089 struct list_head *tmp; 1090 mdk_rdev_t *rdev2; 1091 int max_dev, i; 1092 /* make rdev->sb match mddev and rdev data. */ 1093 1094 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1095 1096 sb->feature_map = 0; 1097 sb->pad0 = 0; 1098 memset(sb->pad1, 0, sizeof(sb->pad1)); 1099 memset(sb->pad2, 0, sizeof(sb->pad2)); 1100 memset(sb->pad3, 0, sizeof(sb->pad3)); 1101 1102 sb->utime = cpu_to_le64((__u64)mddev->utime); 1103 sb->events = cpu_to_le64(mddev->events); 1104 if (mddev->in_sync) 1105 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1106 else 1107 sb->resync_offset = cpu_to_le64(0); 1108 1109 if (mddev->bitmap && mddev->bitmap_file == NULL) { 1110 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); 1111 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1112 } 1113 1114 max_dev = 0; 1115 ITERATE_RDEV(mddev,rdev2,tmp) 1116 if (rdev2->desc_nr+1 > max_dev) 1117 max_dev = rdev2->desc_nr+1; 1118 1119 sb->max_dev = cpu_to_le32(max_dev); 1120 for (i=0; i<max_dev;i++) 1121 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1122 1123 ITERATE_RDEV(mddev,rdev2,tmp) { 1124 i = rdev2->desc_nr; 1125 if (test_bit(Faulty, &rdev2->flags)) 1126 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1127 else if (test_bit(In_sync, &rdev2->flags)) 1128 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1129 else 1130 sb->dev_roles[i] = cpu_to_le16(0xffff); 1131 } 1132 1133 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ 1134 sb->sb_csum = calc_sb_1_csum(sb); 1135 } 1136 1137 1138 static struct super_type super_types[] = { 1139 [0] = { 1140 .name = "0.90.0", 1141 .owner = THIS_MODULE, 1142 .load_super = super_90_load, 1143 .validate_super = super_90_validate, 1144 .sync_super = super_90_sync, 1145 }, 1146 [1] = { 1147 .name = "md-1", 1148 .owner = THIS_MODULE, 1149 .load_super = super_1_load, 1150 .validate_super = super_1_validate, 1151 .sync_super = super_1_sync, 1152 }, 1153 }; 1154 1155 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) 1156 { 1157 struct list_head *tmp; 1158 mdk_rdev_t *rdev; 1159 1160 ITERATE_RDEV(mddev,rdev,tmp) 1161 if (rdev->bdev->bd_contains == dev->bdev->bd_contains) 1162 return rdev; 1163 1164 return NULL; 1165 } 1166 1167 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) 1168 { 1169 struct list_head *tmp; 1170 mdk_rdev_t *rdev; 1171 1172 ITERATE_RDEV(mddev1,rdev,tmp) 1173 if (match_dev_unit(mddev2, rdev)) 1174 return 1; 1175 1176 return 0; 1177 } 1178 1179 static LIST_HEAD(pending_raid_disks); 1180 1181 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) 1182 { 1183 mdk_rdev_t *same_pdev; 1184 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1185 struct kobject *ko; 1186 1187 if (rdev->mddev) { 1188 MD_BUG(); 1189 return -EINVAL; 1190 } 1191 same_pdev = match_dev_unit(mddev, rdev); 1192 if (same_pdev) 1193 printk(KERN_WARNING 1194 "%s: WARNING: %s appears to be on the same physical" 1195 " disk as %s. True\n protection against single-disk" 1196 " failure might be compromised.\n", 1197 mdname(mddev), bdevname(rdev->bdev,b), 1198 bdevname(same_pdev->bdev,b2)); 1199 1200 /* Verify rdev->desc_nr is unique. 1201 * If it is -1, assign a free number, else 1202 * check number is not in use 1203 */ 1204 if (rdev->desc_nr < 0) { 1205 int choice = 0; 1206 if (mddev->pers) choice = mddev->raid_disks; 1207 while (find_rdev_nr(mddev, choice)) 1208 choice++; 1209 rdev->desc_nr = choice; 1210 } else { 1211 if (find_rdev_nr(mddev, rdev->desc_nr)) 1212 return -EBUSY; 1213 } 1214 bdevname(rdev->bdev,b); 1215 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) 1216 return -ENOMEM; 1217 1218 list_add(&rdev->same_set, &mddev->disks); 1219 rdev->mddev = mddev; 1220 printk(KERN_INFO "md: bind<%s>\n", b); 1221 1222 rdev->kobj.parent = &mddev->kobj; 1223 kobject_add(&rdev->kobj); 1224 1225 if (rdev->bdev->bd_part) 1226 ko = &rdev->bdev->bd_part->kobj; 1227 else 1228 ko = &rdev->bdev->bd_disk->kobj; 1229 sysfs_create_link(&rdev->kobj, ko, "block"); 1230 return 0; 1231 } 1232 1233 static void unbind_rdev_from_array(mdk_rdev_t * rdev) 1234 { 1235 char b[BDEVNAME_SIZE]; 1236 if (!rdev->mddev) { 1237 MD_BUG(); 1238 return; 1239 } 1240 list_del_init(&rdev->same_set); 1241 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); 1242 rdev->mddev = NULL; 1243 sysfs_remove_link(&rdev->kobj, "block"); 1244 kobject_del(&rdev->kobj); 1245 } 1246 1247 /* 1248 * prevent the device from being mounted, repartitioned or 1249 * otherwise reused by a RAID array (or any other kernel 1250 * subsystem), by bd_claiming the device. 1251 */ 1252 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) 1253 { 1254 int err = 0; 1255 struct block_device *bdev; 1256 char b[BDEVNAME_SIZE]; 1257 1258 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 1259 if (IS_ERR(bdev)) { 1260 printk(KERN_ERR "md: could not open %s.\n", 1261 __bdevname(dev, b)); 1262 return PTR_ERR(bdev); 1263 } 1264 err = bd_claim(bdev, rdev); 1265 if (err) { 1266 printk(KERN_ERR "md: could not bd_claim %s.\n", 1267 bdevname(bdev, b)); 1268 blkdev_put(bdev); 1269 return err; 1270 } 1271 rdev->bdev = bdev; 1272 return err; 1273 } 1274 1275 static void unlock_rdev(mdk_rdev_t *rdev) 1276 { 1277 struct block_device *bdev = rdev->bdev; 1278 rdev->bdev = NULL; 1279 if (!bdev) 1280 MD_BUG(); 1281 bd_release(bdev); 1282 blkdev_put(bdev); 1283 } 1284 1285 void md_autodetect_dev(dev_t dev); 1286 1287 static void export_rdev(mdk_rdev_t * rdev) 1288 { 1289 char b[BDEVNAME_SIZE]; 1290 printk(KERN_INFO "md: export_rdev(%s)\n", 1291 bdevname(rdev->bdev,b)); 1292 if (rdev->mddev) 1293 MD_BUG(); 1294 free_disk_sb(rdev); 1295 list_del_init(&rdev->same_set); 1296 #ifndef MODULE 1297 md_autodetect_dev(rdev->bdev->bd_dev); 1298 #endif 1299 unlock_rdev(rdev); 1300 kobject_put(&rdev->kobj); 1301 } 1302 1303 static void kick_rdev_from_array(mdk_rdev_t * rdev) 1304 { 1305 unbind_rdev_from_array(rdev); 1306 export_rdev(rdev); 1307 } 1308 1309 static void export_array(mddev_t *mddev) 1310 { 1311 struct list_head *tmp; 1312 mdk_rdev_t *rdev; 1313 1314 ITERATE_RDEV(mddev,rdev,tmp) { 1315 if (!rdev->mddev) { 1316 MD_BUG(); 1317 continue; 1318 } 1319 kick_rdev_from_array(rdev); 1320 } 1321 if (!list_empty(&mddev->disks)) 1322 MD_BUG(); 1323 mddev->raid_disks = 0; 1324 mddev->major_version = 0; 1325 } 1326 1327 static void print_desc(mdp_disk_t *desc) 1328 { 1329 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, 1330 desc->major,desc->minor,desc->raid_disk,desc->state); 1331 } 1332 1333 static void print_sb(mdp_super_t *sb) 1334 { 1335 int i; 1336 1337 printk(KERN_INFO 1338 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", 1339 sb->major_version, sb->minor_version, sb->patch_version, 1340 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, 1341 sb->ctime); 1342 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", 1343 sb->level, sb->size, sb->nr_disks, sb->raid_disks, 1344 sb->md_minor, sb->layout, sb->chunk_size); 1345 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" 1346 " FD:%d SD:%d CSUM:%08x E:%08lx\n", 1347 sb->utime, sb->state, sb->active_disks, sb->working_disks, 1348 sb->failed_disks, sb->spare_disks, 1349 sb->sb_csum, (unsigned long)sb->events_lo); 1350 1351 printk(KERN_INFO); 1352 for (i = 0; i < MD_SB_DISKS; i++) { 1353 mdp_disk_t *desc; 1354 1355 desc = sb->disks + i; 1356 if (desc->number || desc->major || desc->minor || 1357 desc->raid_disk || (desc->state && (desc->state != 4))) { 1358 printk(" D %2d: ", i); 1359 print_desc(desc); 1360 } 1361 } 1362 printk(KERN_INFO "md: THIS: "); 1363 print_desc(&sb->this_disk); 1364 1365 } 1366 1367 static void print_rdev(mdk_rdev_t *rdev) 1368 { 1369 char b[BDEVNAME_SIZE]; 1370 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", 1371 bdevname(rdev->bdev,b), (unsigned long long)rdev->size, 1372 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), 1373 rdev->desc_nr); 1374 if (rdev->sb_loaded) { 1375 printk(KERN_INFO "md: rdev superblock:\n"); 1376 print_sb((mdp_super_t*)page_address(rdev->sb_page)); 1377 } else 1378 printk(KERN_INFO "md: no rdev superblock!\n"); 1379 } 1380 1381 void md_print_devices(void) 1382 { 1383 struct list_head *tmp, *tmp2; 1384 mdk_rdev_t *rdev; 1385 mddev_t *mddev; 1386 char b[BDEVNAME_SIZE]; 1387 1388 printk("\n"); 1389 printk("md: **********************************\n"); 1390 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); 1391 printk("md: **********************************\n"); 1392 ITERATE_MDDEV(mddev,tmp) { 1393 1394 if (mddev->bitmap) 1395 bitmap_print_sb(mddev->bitmap); 1396 else 1397 printk("%s: ", mdname(mddev)); 1398 ITERATE_RDEV(mddev,rdev,tmp2) 1399 printk("<%s>", bdevname(rdev->bdev,b)); 1400 printk("\n"); 1401 1402 ITERATE_RDEV(mddev,rdev,tmp2) 1403 print_rdev(rdev); 1404 } 1405 printk("md: **********************************\n"); 1406 printk("\n"); 1407 } 1408 1409 1410 static void sync_sbs(mddev_t * mddev) 1411 { 1412 mdk_rdev_t *rdev; 1413 struct list_head *tmp; 1414 1415 ITERATE_RDEV(mddev,rdev,tmp) { 1416 super_types[mddev->major_version]. 1417 sync_super(mddev, rdev); 1418 rdev->sb_loaded = 1; 1419 } 1420 } 1421 1422 static void md_update_sb(mddev_t * mddev) 1423 { 1424 int err; 1425 struct list_head *tmp; 1426 mdk_rdev_t *rdev; 1427 int sync_req; 1428 1429 repeat: 1430 spin_lock_irq(&mddev->write_lock); 1431 sync_req = mddev->in_sync; 1432 mddev->utime = get_seconds(); 1433 mddev->events ++; 1434 1435 if (!mddev->events) { 1436 /* 1437 * oops, this 64-bit counter should never wrap. 1438 * Either we are in around ~1 trillion A.C., assuming 1439 * 1 reboot per second, or we have a bug: 1440 */ 1441 MD_BUG(); 1442 mddev->events --; 1443 } 1444 mddev->sb_dirty = 2; 1445 sync_sbs(mddev); 1446 1447 /* 1448 * do not write anything to disk if using 1449 * nonpersistent superblocks 1450 */ 1451 if (!mddev->persistent) { 1452 mddev->sb_dirty = 0; 1453 spin_unlock_irq(&mddev->write_lock); 1454 wake_up(&mddev->sb_wait); 1455 return; 1456 } 1457 spin_unlock_irq(&mddev->write_lock); 1458 1459 dprintk(KERN_INFO 1460 "md: updating %s RAID superblock on device (in sync %d)\n", 1461 mdname(mddev),mddev->in_sync); 1462 1463 err = bitmap_update_sb(mddev->bitmap); 1464 ITERATE_RDEV(mddev,rdev,tmp) { 1465 char b[BDEVNAME_SIZE]; 1466 dprintk(KERN_INFO "md: "); 1467 if (test_bit(Faulty, &rdev->flags)) 1468 dprintk("(skipping faulty "); 1469 1470 dprintk("%s ", bdevname(rdev->bdev,b)); 1471 if (!test_bit(Faulty, &rdev->flags)) { 1472 md_super_write(mddev,rdev, 1473 rdev->sb_offset<<1, rdev->sb_size, 1474 rdev->sb_page); 1475 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", 1476 bdevname(rdev->bdev,b), 1477 (unsigned long long)rdev->sb_offset); 1478 1479 } else 1480 dprintk(")\n"); 1481 if (mddev->level == LEVEL_MULTIPATH) 1482 /* only need to write one superblock... */ 1483 break; 1484 } 1485 md_super_wait(mddev); 1486 /* if there was a failure, sb_dirty was set to 1, and we re-write super */ 1487 1488 spin_lock_irq(&mddev->write_lock); 1489 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { 1490 /* have to write it out again */ 1491 spin_unlock_irq(&mddev->write_lock); 1492 goto repeat; 1493 } 1494 mddev->sb_dirty = 0; 1495 spin_unlock_irq(&mddev->write_lock); 1496 wake_up(&mddev->sb_wait); 1497 1498 } 1499 1500 struct rdev_sysfs_entry { 1501 struct attribute attr; 1502 ssize_t (*show)(mdk_rdev_t *, char *); 1503 ssize_t (*store)(mdk_rdev_t *, const char *, size_t); 1504 }; 1505 1506 static ssize_t 1507 state_show(mdk_rdev_t *rdev, char *page) 1508 { 1509 char *sep = ""; 1510 int len=0; 1511 1512 if (test_bit(Faulty, &rdev->flags)) { 1513 len+= sprintf(page+len, "%sfaulty",sep); 1514 sep = ","; 1515 } 1516 if (test_bit(In_sync, &rdev->flags)) { 1517 len += sprintf(page+len, "%sin_sync",sep); 1518 sep = ","; 1519 } 1520 if (!test_bit(Faulty, &rdev->flags) && 1521 !test_bit(In_sync, &rdev->flags)) { 1522 len += sprintf(page+len, "%sspare", sep); 1523 sep = ","; 1524 } 1525 return len+sprintf(page+len, "\n"); 1526 } 1527 1528 static struct rdev_sysfs_entry 1529 rdev_state = __ATTR_RO(state); 1530 1531 static ssize_t 1532 super_show(mdk_rdev_t *rdev, char *page) 1533 { 1534 if (rdev->sb_loaded && rdev->sb_size) { 1535 memcpy(page, page_address(rdev->sb_page), rdev->sb_size); 1536 return rdev->sb_size; 1537 } else 1538 return 0; 1539 } 1540 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); 1541 1542 static struct attribute *rdev_default_attrs[] = { 1543 &rdev_state.attr, 1544 &rdev_super.attr, 1545 NULL, 1546 }; 1547 static ssize_t 1548 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 1549 { 1550 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 1551 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 1552 1553 if (!entry->show) 1554 return -EIO; 1555 return entry->show(rdev, page); 1556 } 1557 1558 static ssize_t 1559 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 1560 const char *page, size_t length) 1561 { 1562 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 1563 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 1564 1565 if (!entry->store) 1566 return -EIO; 1567 return entry->store(rdev, page, length); 1568 } 1569 1570 static void rdev_free(struct kobject *ko) 1571 { 1572 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); 1573 kfree(rdev); 1574 } 1575 static struct sysfs_ops rdev_sysfs_ops = { 1576 .show = rdev_attr_show, 1577 .store = rdev_attr_store, 1578 }; 1579 static struct kobj_type rdev_ktype = { 1580 .release = rdev_free, 1581 .sysfs_ops = &rdev_sysfs_ops, 1582 .default_attrs = rdev_default_attrs, 1583 }; 1584 1585 /* 1586 * Import a device. If 'super_format' >= 0, then sanity check the superblock 1587 * 1588 * mark the device faulty if: 1589 * 1590 * - the device is nonexistent (zero size) 1591 * - the device has no valid superblock 1592 * 1593 * a faulty rdev _never_ has rdev->sb set. 1594 */ 1595 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) 1596 { 1597 char b[BDEVNAME_SIZE]; 1598 int err; 1599 mdk_rdev_t *rdev; 1600 sector_t size; 1601 1602 rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL); 1603 if (!rdev) { 1604 printk(KERN_ERR "md: could not alloc mem for new device!\n"); 1605 return ERR_PTR(-ENOMEM); 1606 } 1607 memset(rdev, 0, sizeof(*rdev)); 1608 1609 if ((err = alloc_disk_sb(rdev))) 1610 goto abort_free; 1611 1612 err = lock_rdev(rdev, newdev); 1613 if (err) 1614 goto abort_free; 1615 1616 rdev->kobj.parent = NULL; 1617 rdev->kobj.ktype = &rdev_ktype; 1618 kobject_init(&rdev->kobj); 1619 1620 rdev->desc_nr = -1; 1621 rdev->flags = 0; 1622 rdev->data_offset = 0; 1623 atomic_set(&rdev->nr_pending, 0); 1624 atomic_set(&rdev->read_errors, 0); 1625 1626 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 1627 if (!size) { 1628 printk(KERN_WARNING 1629 "md: %s has zero or unknown size, marking faulty!\n", 1630 bdevname(rdev->bdev,b)); 1631 err = -EINVAL; 1632 goto abort_free; 1633 } 1634 1635 if (super_format >= 0) { 1636 err = super_types[super_format]. 1637 load_super(rdev, NULL, super_minor); 1638 if (err == -EINVAL) { 1639 printk(KERN_WARNING 1640 "md: %s has invalid sb, not importing!\n", 1641 bdevname(rdev->bdev,b)); 1642 goto abort_free; 1643 } 1644 if (err < 0) { 1645 printk(KERN_WARNING 1646 "md: could not read %s's sb, not importing!\n", 1647 bdevname(rdev->bdev,b)); 1648 goto abort_free; 1649 } 1650 } 1651 INIT_LIST_HEAD(&rdev->same_set); 1652 1653 return rdev; 1654 1655 abort_free: 1656 if (rdev->sb_page) { 1657 if (rdev->bdev) 1658 unlock_rdev(rdev); 1659 free_disk_sb(rdev); 1660 } 1661 kfree(rdev); 1662 return ERR_PTR(err); 1663 } 1664 1665 /* 1666 * Check a full RAID array for plausibility 1667 */ 1668 1669 1670 static void analyze_sbs(mddev_t * mddev) 1671 { 1672 int i; 1673 struct list_head *tmp; 1674 mdk_rdev_t *rdev, *freshest; 1675 char b[BDEVNAME_SIZE]; 1676 1677 freshest = NULL; 1678 ITERATE_RDEV(mddev,rdev,tmp) 1679 switch (super_types[mddev->major_version]. 1680 load_super(rdev, freshest, mddev->minor_version)) { 1681 case 1: 1682 freshest = rdev; 1683 break; 1684 case 0: 1685 break; 1686 default: 1687 printk( KERN_ERR \ 1688 "md: fatal superblock inconsistency in %s" 1689 " -- removing from array\n", 1690 bdevname(rdev->bdev,b)); 1691 kick_rdev_from_array(rdev); 1692 } 1693 1694 1695 super_types[mddev->major_version]. 1696 validate_super(mddev, freshest); 1697 1698 i = 0; 1699 ITERATE_RDEV(mddev,rdev,tmp) { 1700 if (rdev != freshest) 1701 if (super_types[mddev->major_version]. 1702 validate_super(mddev, rdev)) { 1703 printk(KERN_WARNING "md: kicking non-fresh %s" 1704 " from array!\n", 1705 bdevname(rdev->bdev,b)); 1706 kick_rdev_from_array(rdev); 1707 continue; 1708 } 1709 if (mddev->level == LEVEL_MULTIPATH) { 1710 rdev->desc_nr = i++; 1711 rdev->raid_disk = rdev->desc_nr; 1712 set_bit(In_sync, &rdev->flags); 1713 } 1714 } 1715 1716 1717 1718 if (mddev->recovery_cp != MaxSector && 1719 mddev->level >= 1) 1720 printk(KERN_ERR "md: %s: raid array is not clean" 1721 " -- starting background reconstruction\n", 1722 mdname(mddev)); 1723 1724 } 1725 1726 static ssize_t 1727 level_show(mddev_t *mddev, char *page) 1728 { 1729 mdk_personality_t *p = mddev->pers; 1730 if (p == NULL && mddev->raid_disks == 0) 1731 return 0; 1732 if (mddev->level >= 0) 1733 return sprintf(page, "RAID-%d\n", mddev->level); 1734 else 1735 return sprintf(page, "%s\n", p->name); 1736 } 1737 1738 static struct md_sysfs_entry md_level = __ATTR_RO(level); 1739 1740 static ssize_t 1741 raid_disks_show(mddev_t *mddev, char *page) 1742 { 1743 if (mddev->raid_disks == 0) 1744 return 0; 1745 return sprintf(page, "%d\n", mddev->raid_disks); 1746 } 1747 1748 static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks); 1749 1750 static ssize_t 1751 action_show(mddev_t *mddev, char *page) 1752 { 1753 char *type = "idle"; 1754 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 1755 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { 1756 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 1757 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 1758 type = "resync"; 1759 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 1760 type = "check"; 1761 else 1762 type = "repair"; 1763 } else 1764 type = "recover"; 1765 } 1766 return sprintf(page, "%s\n", type); 1767 } 1768 1769 static ssize_t 1770 action_store(mddev_t *mddev, const char *page, size_t len) 1771 { 1772 if (!mddev->pers || !mddev->pers->sync_request) 1773 return -EINVAL; 1774 1775 if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) { 1776 if (mddev->sync_thread) { 1777 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1778 md_unregister_thread(mddev->sync_thread); 1779 mddev->sync_thread = NULL; 1780 mddev->recovery = 0; 1781 } 1782 return len; 1783 } 1784 1785 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 1786 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 1787 return -EBUSY; 1788 if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 || 1789 strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0) 1790 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 1791 else { 1792 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0) 1793 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 1794 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0) 1795 return -EINVAL; 1796 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 1797 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 1798 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 1799 } 1800 md_wakeup_thread(mddev->thread); 1801 return len; 1802 } 1803 1804 static ssize_t 1805 mismatch_cnt_show(mddev_t *mddev, char *page) 1806 { 1807 return sprintf(page, "%llu\n", 1808 (unsigned long long) mddev->resync_mismatches); 1809 } 1810 1811 static struct md_sysfs_entry 1812 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 1813 1814 1815 static struct md_sysfs_entry 1816 md_mismatches = __ATTR_RO(mismatch_cnt); 1817 1818 static struct attribute *md_default_attrs[] = { 1819 &md_level.attr, 1820 &md_raid_disks.attr, 1821 NULL, 1822 }; 1823 1824 static struct attribute *md_redundancy_attrs[] = { 1825 &md_scan_mode.attr, 1826 &md_mismatches.attr, 1827 NULL, 1828 }; 1829 static struct attribute_group md_redundancy_group = { 1830 .name = NULL, 1831 .attrs = md_redundancy_attrs, 1832 }; 1833 1834 1835 static ssize_t 1836 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 1837 { 1838 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 1839 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 1840 ssize_t rv; 1841 1842 if (!entry->show) 1843 return -EIO; 1844 mddev_lock(mddev); 1845 rv = entry->show(mddev, page); 1846 mddev_unlock(mddev); 1847 return rv; 1848 } 1849 1850 static ssize_t 1851 md_attr_store(struct kobject *kobj, struct attribute *attr, 1852 const char *page, size_t length) 1853 { 1854 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 1855 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 1856 ssize_t rv; 1857 1858 if (!entry->store) 1859 return -EIO; 1860 mddev_lock(mddev); 1861 rv = entry->store(mddev, page, length); 1862 mddev_unlock(mddev); 1863 return rv; 1864 } 1865 1866 static void md_free(struct kobject *ko) 1867 { 1868 mddev_t *mddev = container_of(ko, mddev_t, kobj); 1869 kfree(mddev); 1870 } 1871 1872 static struct sysfs_ops md_sysfs_ops = { 1873 .show = md_attr_show, 1874 .store = md_attr_store, 1875 }; 1876 static struct kobj_type md_ktype = { 1877 .release = md_free, 1878 .sysfs_ops = &md_sysfs_ops, 1879 .default_attrs = md_default_attrs, 1880 }; 1881 1882 int mdp_major = 0; 1883 1884 static struct kobject *md_probe(dev_t dev, int *part, void *data) 1885 { 1886 static DECLARE_MUTEX(disks_sem); 1887 mddev_t *mddev = mddev_find(dev); 1888 struct gendisk *disk; 1889 int partitioned = (MAJOR(dev) != MD_MAJOR); 1890 int shift = partitioned ? MdpMinorShift : 0; 1891 int unit = MINOR(dev) >> shift; 1892 1893 if (!mddev) 1894 return NULL; 1895 1896 down(&disks_sem); 1897 if (mddev->gendisk) { 1898 up(&disks_sem); 1899 mddev_put(mddev); 1900 return NULL; 1901 } 1902 disk = alloc_disk(1 << shift); 1903 if (!disk) { 1904 up(&disks_sem); 1905 mddev_put(mddev); 1906 return NULL; 1907 } 1908 disk->major = MAJOR(dev); 1909 disk->first_minor = unit << shift; 1910 if (partitioned) { 1911 sprintf(disk->disk_name, "md_d%d", unit); 1912 sprintf(disk->devfs_name, "md/d%d", unit); 1913 } else { 1914 sprintf(disk->disk_name, "md%d", unit); 1915 sprintf(disk->devfs_name, "md/%d", unit); 1916 } 1917 disk->fops = &md_fops; 1918 disk->private_data = mddev; 1919 disk->queue = mddev->queue; 1920 add_disk(disk); 1921 mddev->gendisk = disk; 1922 up(&disks_sem); 1923 mddev->kobj.parent = &disk->kobj; 1924 mddev->kobj.k_name = NULL; 1925 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); 1926 mddev->kobj.ktype = &md_ktype; 1927 kobject_register(&mddev->kobj); 1928 return NULL; 1929 } 1930 1931 void md_wakeup_thread(mdk_thread_t *thread); 1932 1933 static void md_safemode_timeout(unsigned long data) 1934 { 1935 mddev_t *mddev = (mddev_t *) data; 1936 1937 mddev->safemode = 1; 1938 md_wakeup_thread(mddev->thread); 1939 } 1940 1941 1942 static int do_md_run(mddev_t * mddev) 1943 { 1944 int pnum, err; 1945 int chunk_size; 1946 struct list_head *tmp; 1947 mdk_rdev_t *rdev; 1948 struct gendisk *disk; 1949 char b[BDEVNAME_SIZE]; 1950 1951 if (list_empty(&mddev->disks)) 1952 /* cannot run an array with no devices.. */ 1953 return -EINVAL; 1954 1955 if (mddev->pers) 1956 return -EBUSY; 1957 1958 /* 1959 * Analyze all RAID superblock(s) 1960 */ 1961 if (!mddev->raid_disks) 1962 analyze_sbs(mddev); 1963 1964 chunk_size = mddev->chunk_size; 1965 pnum = level_to_pers(mddev->level); 1966 1967 if ((pnum != MULTIPATH) && (pnum != RAID1)) { 1968 if (!chunk_size) { 1969 /* 1970 * 'default chunksize' in the old md code used to 1971 * be PAGE_SIZE, baaad. 1972 * we abort here to be on the safe side. We don't 1973 * want to continue the bad practice. 1974 */ 1975 printk(KERN_ERR 1976 "no chunksize specified, see 'man raidtab'\n"); 1977 return -EINVAL; 1978 } 1979 if (chunk_size > MAX_CHUNK_SIZE) { 1980 printk(KERN_ERR "too big chunk_size: %d > %d\n", 1981 chunk_size, MAX_CHUNK_SIZE); 1982 return -EINVAL; 1983 } 1984 /* 1985 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE 1986 */ 1987 if ( (1 << ffz(~chunk_size)) != chunk_size) { 1988 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); 1989 return -EINVAL; 1990 } 1991 if (chunk_size < PAGE_SIZE) { 1992 printk(KERN_ERR "too small chunk_size: %d < %ld\n", 1993 chunk_size, PAGE_SIZE); 1994 return -EINVAL; 1995 } 1996 1997 /* devices must have minimum size of one chunk */ 1998 ITERATE_RDEV(mddev,rdev,tmp) { 1999 if (test_bit(Faulty, &rdev->flags)) 2000 continue; 2001 if (rdev->size < chunk_size / 1024) { 2002 printk(KERN_WARNING 2003 "md: Dev %s smaller than chunk_size:" 2004 " %lluk < %dk\n", 2005 bdevname(rdev->bdev,b), 2006 (unsigned long long)rdev->size, 2007 chunk_size / 1024); 2008 return -EINVAL; 2009 } 2010 } 2011 } 2012 2013 #ifdef CONFIG_KMOD 2014 if (!pers[pnum]) 2015 { 2016 request_module("md-personality-%d", pnum); 2017 } 2018 #endif 2019 2020 /* 2021 * Drop all container device buffers, from now on 2022 * the only valid external interface is through the md 2023 * device. 2024 * Also find largest hardsector size 2025 */ 2026 ITERATE_RDEV(mddev,rdev,tmp) { 2027 if (test_bit(Faulty, &rdev->flags)) 2028 continue; 2029 sync_blockdev(rdev->bdev); 2030 invalidate_bdev(rdev->bdev, 0); 2031 } 2032 2033 md_probe(mddev->unit, NULL, NULL); 2034 disk = mddev->gendisk; 2035 if (!disk) 2036 return -ENOMEM; 2037 2038 spin_lock(&pers_lock); 2039 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) { 2040 spin_unlock(&pers_lock); 2041 printk(KERN_WARNING "md: personality %d is not loaded!\n", 2042 pnum); 2043 return -EINVAL; 2044 } 2045 2046 mddev->pers = pers[pnum]; 2047 spin_unlock(&pers_lock); 2048 2049 mddev->recovery = 0; 2050 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ 2051 mddev->barriers_work = 1; 2052 2053 if (start_readonly) 2054 mddev->ro = 2; /* read-only, but switch on first write */ 2055 2056 /* before we start the array running, initialise the bitmap */ 2057 err = bitmap_create(mddev); 2058 if (err) 2059 printk(KERN_ERR "%s: failed to create bitmap (%d)\n", 2060 mdname(mddev), err); 2061 else 2062 err = mddev->pers->run(mddev); 2063 if (err) { 2064 printk(KERN_ERR "md: pers->run() failed ...\n"); 2065 module_put(mddev->pers->owner); 2066 mddev->pers = NULL; 2067 bitmap_destroy(mddev); 2068 return err; 2069 } 2070 if (mddev->pers->sync_request) 2071 sysfs_create_group(&mddev->kobj, &md_redundancy_group); 2072 else if (mddev->ro == 2) /* auto-readonly not meaningful */ 2073 mddev->ro = 0; 2074 2075 atomic_set(&mddev->writes_pending,0); 2076 mddev->safemode = 0; 2077 mddev->safemode_timer.function = md_safemode_timeout; 2078 mddev->safemode_timer.data = (unsigned long) mddev; 2079 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ 2080 mddev->in_sync = 1; 2081 2082 ITERATE_RDEV(mddev,rdev,tmp) 2083 if (rdev->raid_disk >= 0) { 2084 char nm[20]; 2085 sprintf(nm, "rd%d", rdev->raid_disk); 2086 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 2087 } 2088 2089 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2090 md_wakeup_thread(mddev->thread); 2091 2092 if (mddev->sb_dirty) 2093 md_update_sb(mddev); 2094 2095 set_capacity(disk, mddev->array_size<<1); 2096 2097 /* If we call blk_queue_make_request here, it will 2098 * re-initialise max_sectors etc which may have been 2099 * refined inside -> run. So just set the bits we need to set. 2100 * Most initialisation happended when we called 2101 * blk_queue_make_request(..., md_fail_request) 2102 * earlier. 2103 */ 2104 mddev->queue->queuedata = mddev; 2105 mddev->queue->make_request_fn = mddev->pers->make_request; 2106 2107 mddev->changed = 1; 2108 return 0; 2109 } 2110 2111 static int restart_array(mddev_t *mddev) 2112 { 2113 struct gendisk *disk = mddev->gendisk; 2114 int err; 2115 2116 /* 2117 * Complain if it has no devices 2118 */ 2119 err = -ENXIO; 2120 if (list_empty(&mddev->disks)) 2121 goto out; 2122 2123 if (mddev->pers) { 2124 err = -EBUSY; 2125 if (!mddev->ro) 2126 goto out; 2127 2128 mddev->safemode = 0; 2129 mddev->ro = 0; 2130 set_disk_ro(disk, 0); 2131 2132 printk(KERN_INFO "md: %s switched to read-write mode.\n", 2133 mdname(mddev)); 2134 /* 2135 * Kick recovery or resync if necessary 2136 */ 2137 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2138 md_wakeup_thread(mddev->thread); 2139 err = 0; 2140 } else { 2141 printk(KERN_ERR "md: %s has no personality assigned.\n", 2142 mdname(mddev)); 2143 err = -EINVAL; 2144 } 2145 2146 out: 2147 return err; 2148 } 2149 2150 static int do_md_stop(mddev_t * mddev, int ro) 2151 { 2152 int err = 0; 2153 struct gendisk *disk = mddev->gendisk; 2154 2155 if (mddev->pers) { 2156 if (atomic_read(&mddev->active)>2) { 2157 printk("md: %s still in use.\n",mdname(mddev)); 2158 return -EBUSY; 2159 } 2160 2161 if (mddev->sync_thread) { 2162 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 2163 md_unregister_thread(mddev->sync_thread); 2164 mddev->sync_thread = NULL; 2165 } 2166 2167 del_timer_sync(&mddev->safemode_timer); 2168 2169 invalidate_partition(disk, 0); 2170 2171 if (ro) { 2172 err = -ENXIO; 2173 if (mddev->ro==1) 2174 goto out; 2175 mddev->ro = 1; 2176 } else { 2177 bitmap_flush(mddev); 2178 md_super_wait(mddev); 2179 if (mddev->ro) 2180 set_disk_ro(disk, 0); 2181 blk_queue_make_request(mddev->queue, md_fail_request); 2182 mddev->pers->stop(mddev); 2183 if (mddev->pers->sync_request) 2184 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 2185 2186 module_put(mddev->pers->owner); 2187 mddev->pers = NULL; 2188 if (mddev->ro) 2189 mddev->ro = 0; 2190 } 2191 if (!mddev->in_sync) { 2192 /* mark array as shutdown cleanly */ 2193 mddev->in_sync = 1; 2194 md_update_sb(mddev); 2195 } 2196 if (ro) 2197 set_disk_ro(disk, 1); 2198 } 2199 2200 bitmap_destroy(mddev); 2201 if (mddev->bitmap_file) { 2202 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); 2203 fput(mddev->bitmap_file); 2204 mddev->bitmap_file = NULL; 2205 } 2206 mddev->bitmap_offset = 0; 2207 2208 /* 2209 * Free resources if final stop 2210 */ 2211 if (!ro) { 2212 mdk_rdev_t *rdev; 2213 struct list_head *tmp; 2214 struct gendisk *disk; 2215 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); 2216 2217 ITERATE_RDEV(mddev,rdev,tmp) 2218 if (rdev->raid_disk >= 0) { 2219 char nm[20]; 2220 sprintf(nm, "rd%d", rdev->raid_disk); 2221 sysfs_remove_link(&mddev->kobj, nm); 2222 } 2223 2224 export_array(mddev); 2225 2226 mddev->array_size = 0; 2227 disk = mddev->gendisk; 2228 if (disk) 2229 set_capacity(disk, 0); 2230 mddev->changed = 1; 2231 } else 2232 printk(KERN_INFO "md: %s switched to read-only mode.\n", 2233 mdname(mddev)); 2234 err = 0; 2235 out: 2236 return err; 2237 } 2238 2239 static void autorun_array(mddev_t *mddev) 2240 { 2241 mdk_rdev_t *rdev; 2242 struct list_head *tmp; 2243 int err; 2244 2245 if (list_empty(&mddev->disks)) 2246 return; 2247 2248 printk(KERN_INFO "md: running: "); 2249 2250 ITERATE_RDEV(mddev,rdev,tmp) { 2251 char b[BDEVNAME_SIZE]; 2252 printk("<%s>", bdevname(rdev->bdev,b)); 2253 } 2254 printk("\n"); 2255 2256 err = do_md_run (mddev); 2257 if (err) { 2258 printk(KERN_WARNING "md: do_md_run() returned %d\n", err); 2259 do_md_stop (mddev, 0); 2260 } 2261 } 2262 2263 /* 2264 * lets try to run arrays based on all disks that have arrived 2265 * until now. (those are in pending_raid_disks) 2266 * 2267 * the method: pick the first pending disk, collect all disks with 2268 * the same UUID, remove all from the pending list and put them into 2269 * the 'same_array' list. Then order this list based on superblock 2270 * update time (freshest comes first), kick out 'old' disks and 2271 * compare superblocks. If everything's fine then run it. 2272 * 2273 * If "unit" is allocated, then bump its reference count 2274 */ 2275 static void autorun_devices(int part) 2276 { 2277 struct list_head candidates; 2278 struct list_head *tmp; 2279 mdk_rdev_t *rdev0, *rdev; 2280 mddev_t *mddev; 2281 char b[BDEVNAME_SIZE]; 2282 2283 printk(KERN_INFO "md: autorun ...\n"); 2284 while (!list_empty(&pending_raid_disks)) { 2285 dev_t dev; 2286 rdev0 = list_entry(pending_raid_disks.next, 2287 mdk_rdev_t, same_set); 2288 2289 printk(KERN_INFO "md: considering %s ...\n", 2290 bdevname(rdev0->bdev,b)); 2291 INIT_LIST_HEAD(&candidates); 2292 ITERATE_RDEV_PENDING(rdev,tmp) 2293 if (super_90_load(rdev, rdev0, 0) >= 0) { 2294 printk(KERN_INFO "md: adding %s ...\n", 2295 bdevname(rdev->bdev,b)); 2296 list_move(&rdev->same_set, &candidates); 2297 } 2298 /* 2299 * now we have a set of devices, with all of them having 2300 * mostly sane superblocks. It's time to allocate the 2301 * mddev. 2302 */ 2303 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { 2304 printk(KERN_INFO "md: unit number in %s is bad: %d\n", 2305 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 2306 break; 2307 } 2308 if (part) 2309 dev = MKDEV(mdp_major, 2310 rdev0->preferred_minor << MdpMinorShift); 2311 else 2312 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 2313 2314 md_probe(dev, NULL, NULL); 2315 mddev = mddev_find(dev); 2316 if (!mddev) { 2317 printk(KERN_ERR 2318 "md: cannot allocate memory for md drive.\n"); 2319 break; 2320 } 2321 if (mddev_lock(mddev)) 2322 printk(KERN_WARNING "md: %s locked, cannot run\n", 2323 mdname(mddev)); 2324 else if (mddev->raid_disks || mddev->major_version 2325 || !list_empty(&mddev->disks)) { 2326 printk(KERN_WARNING 2327 "md: %s already running, cannot run %s\n", 2328 mdname(mddev), bdevname(rdev0->bdev,b)); 2329 mddev_unlock(mddev); 2330 } else { 2331 printk(KERN_INFO "md: created %s\n", mdname(mddev)); 2332 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { 2333 list_del_init(&rdev->same_set); 2334 if (bind_rdev_to_array(rdev, mddev)) 2335 export_rdev(rdev); 2336 } 2337 autorun_array(mddev); 2338 mddev_unlock(mddev); 2339 } 2340 /* on success, candidates will be empty, on error 2341 * it won't... 2342 */ 2343 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) 2344 export_rdev(rdev); 2345 mddev_put(mddev); 2346 } 2347 printk(KERN_INFO "md: ... autorun DONE.\n"); 2348 } 2349 2350 /* 2351 * import RAID devices based on one partition 2352 * if possible, the array gets run as well. 2353 */ 2354 2355 static int autostart_array(dev_t startdev) 2356 { 2357 char b[BDEVNAME_SIZE]; 2358 int err = -EINVAL, i; 2359 mdp_super_t *sb = NULL; 2360 mdk_rdev_t *start_rdev = NULL, *rdev; 2361 2362 start_rdev = md_import_device(startdev, 0, 0); 2363 if (IS_ERR(start_rdev)) 2364 return err; 2365 2366 2367 /* NOTE: this can only work for 0.90.0 superblocks */ 2368 sb = (mdp_super_t*)page_address(start_rdev->sb_page); 2369 if (sb->major_version != 0 || 2370 sb->minor_version != 90 ) { 2371 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); 2372 export_rdev(start_rdev); 2373 return err; 2374 } 2375 2376 if (test_bit(Faulty, &start_rdev->flags)) { 2377 printk(KERN_WARNING 2378 "md: can not autostart based on faulty %s!\n", 2379 bdevname(start_rdev->bdev,b)); 2380 export_rdev(start_rdev); 2381 return err; 2382 } 2383 list_add(&start_rdev->same_set, &pending_raid_disks); 2384 2385 for (i = 0; i < MD_SB_DISKS; i++) { 2386 mdp_disk_t *desc = sb->disks + i; 2387 dev_t dev = MKDEV(desc->major, desc->minor); 2388 2389 if (!dev) 2390 continue; 2391 if (dev == startdev) 2392 continue; 2393 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) 2394 continue; 2395 rdev = md_import_device(dev, 0, 0); 2396 if (IS_ERR(rdev)) 2397 continue; 2398 2399 list_add(&rdev->same_set, &pending_raid_disks); 2400 } 2401 2402 /* 2403 * possibly return codes 2404 */ 2405 autorun_devices(0); 2406 return 0; 2407 2408 } 2409 2410 2411 static int get_version(void __user * arg) 2412 { 2413 mdu_version_t ver; 2414 2415 ver.major = MD_MAJOR_VERSION; 2416 ver.minor = MD_MINOR_VERSION; 2417 ver.patchlevel = MD_PATCHLEVEL_VERSION; 2418 2419 if (copy_to_user(arg, &ver, sizeof(ver))) 2420 return -EFAULT; 2421 2422 return 0; 2423 } 2424 2425 static int get_array_info(mddev_t * mddev, void __user * arg) 2426 { 2427 mdu_array_info_t info; 2428 int nr,working,active,failed,spare; 2429 mdk_rdev_t *rdev; 2430 struct list_head *tmp; 2431 2432 nr=working=active=failed=spare=0; 2433 ITERATE_RDEV(mddev,rdev,tmp) { 2434 nr++; 2435 if (test_bit(Faulty, &rdev->flags)) 2436 failed++; 2437 else { 2438 working++; 2439 if (test_bit(In_sync, &rdev->flags)) 2440 active++; 2441 else 2442 spare++; 2443 } 2444 } 2445 2446 info.major_version = mddev->major_version; 2447 info.minor_version = mddev->minor_version; 2448 info.patch_version = MD_PATCHLEVEL_VERSION; 2449 info.ctime = mddev->ctime; 2450 info.level = mddev->level; 2451 info.size = mddev->size; 2452 info.nr_disks = nr; 2453 info.raid_disks = mddev->raid_disks; 2454 info.md_minor = mddev->md_minor; 2455 info.not_persistent= !mddev->persistent; 2456 2457 info.utime = mddev->utime; 2458 info.state = 0; 2459 if (mddev->in_sync) 2460 info.state = (1<<MD_SB_CLEAN); 2461 if (mddev->bitmap && mddev->bitmap_offset) 2462 info.state = (1<<MD_SB_BITMAP_PRESENT); 2463 info.active_disks = active; 2464 info.working_disks = working; 2465 info.failed_disks = failed; 2466 info.spare_disks = spare; 2467 2468 info.layout = mddev->layout; 2469 info.chunk_size = mddev->chunk_size; 2470 2471 if (copy_to_user(arg, &info, sizeof(info))) 2472 return -EFAULT; 2473 2474 return 0; 2475 } 2476 2477 static int get_bitmap_file(mddev_t * mddev, void __user * arg) 2478 { 2479 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 2480 char *ptr, *buf = NULL; 2481 int err = -ENOMEM; 2482 2483 file = kmalloc(sizeof(*file), GFP_KERNEL); 2484 if (!file) 2485 goto out; 2486 2487 /* bitmap disabled, zero the first byte and copy out */ 2488 if (!mddev->bitmap || !mddev->bitmap->file) { 2489 file->pathname[0] = '\0'; 2490 goto copy_out; 2491 } 2492 2493 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); 2494 if (!buf) 2495 goto out; 2496 2497 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); 2498 if (!ptr) 2499 goto out; 2500 2501 strcpy(file->pathname, ptr); 2502 2503 copy_out: 2504 err = 0; 2505 if (copy_to_user(arg, file, sizeof(*file))) 2506 err = -EFAULT; 2507 out: 2508 kfree(buf); 2509 kfree(file); 2510 return err; 2511 } 2512 2513 static int get_disk_info(mddev_t * mddev, void __user * arg) 2514 { 2515 mdu_disk_info_t info; 2516 unsigned int nr; 2517 mdk_rdev_t *rdev; 2518 2519 if (copy_from_user(&info, arg, sizeof(info))) 2520 return -EFAULT; 2521 2522 nr = info.number; 2523 2524 rdev = find_rdev_nr(mddev, nr); 2525 if (rdev) { 2526 info.major = MAJOR(rdev->bdev->bd_dev); 2527 info.minor = MINOR(rdev->bdev->bd_dev); 2528 info.raid_disk = rdev->raid_disk; 2529 info.state = 0; 2530 if (test_bit(Faulty, &rdev->flags)) 2531 info.state |= (1<<MD_DISK_FAULTY); 2532 else if (test_bit(In_sync, &rdev->flags)) { 2533 info.state |= (1<<MD_DISK_ACTIVE); 2534 info.state |= (1<<MD_DISK_SYNC); 2535 } 2536 if (test_bit(WriteMostly, &rdev->flags)) 2537 info.state |= (1<<MD_DISK_WRITEMOSTLY); 2538 } else { 2539 info.major = info.minor = 0; 2540 info.raid_disk = -1; 2541 info.state = (1<<MD_DISK_REMOVED); 2542 } 2543 2544 if (copy_to_user(arg, &info, sizeof(info))) 2545 return -EFAULT; 2546 2547 return 0; 2548 } 2549 2550 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) 2551 { 2552 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 2553 mdk_rdev_t *rdev; 2554 dev_t dev = MKDEV(info->major,info->minor); 2555 2556 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 2557 return -EOVERFLOW; 2558 2559 if (!mddev->raid_disks) { 2560 int err; 2561 /* expecting a device which has a superblock */ 2562 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 2563 if (IS_ERR(rdev)) { 2564 printk(KERN_WARNING 2565 "md: md_import_device returned %ld\n", 2566 PTR_ERR(rdev)); 2567 return PTR_ERR(rdev); 2568 } 2569 if (!list_empty(&mddev->disks)) { 2570 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, 2571 mdk_rdev_t, same_set); 2572 int err = super_types[mddev->major_version] 2573 .load_super(rdev, rdev0, mddev->minor_version); 2574 if (err < 0) { 2575 printk(KERN_WARNING 2576 "md: %s has different UUID to %s\n", 2577 bdevname(rdev->bdev,b), 2578 bdevname(rdev0->bdev,b2)); 2579 export_rdev(rdev); 2580 return -EINVAL; 2581 } 2582 } 2583 err = bind_rdev_to_array(rdev, mddev); 2584 if (err) 2585 export_rdev(rdev); 2586 return err; 2587 } 2588 2589 /* 2590 * add_new_disk can be used once the array is assembled 2591 * to add "hot spares". They must already have a superblock 2592 * written 2593 */ 2594 if (mddev->pers) { 2595 int err; 2596 if (!mddev->pers->hot_add_disk) { 2597 printk(KERN_WARNING 2598 "%s: personality does not support diskops!\n", 2599 mdname(mddev)); 2600 return -EINVAL; 2601 } 2602 if (mddev->persistent) 2603 rdev = md_import_device(dev, mddev->major_version, 2604 mddev->minor_version); 2605 else 2606 rdev = md_import_device(dev, -1, -1); 2607 if (IS_ERR(rdev)) { 2608 printk(KERN_WARNING 2609 "md: md_import_device returned %ld\n", 2610 PTR_ERR(rdev)); 2611 return PTR_ERR(rdev); 2612 } 2613 /* set save_raid_disk if appropriate */ 2614 if (!mddev->persistent) { 2615 if (info->state & (1<<MD_DISK_SYNC) && 2616 info->raid_disk < mddev->raid_disks) 2617 rdev->raid_disk = info->raid_disk; 2618 else 2619 rdev->raid_disk = -1; 2620 } else 2621 super_types[mddev->major_version]. 2622 validate_super(mddev, rdev); 2623 rdev->saved_raid_disk = rdev->raid_disk; 2624 2625 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 2626 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 2627 set_bit(WriteMostly, &rdev->flags); 2628 2629 rdev->raid_disk = -1; 2630 err = bind_rdev_to_array(rdev, mddev); 2631 if (err) 2632 export_rdev(rdev); 2633 2634 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2635 md_wakeup_thread(mddev->thread); 2636 return err; 2637 } 2638 2639 /* otherwise, add_new_disk is only allowed 2640 * for major_version==0 superblocks 2641 */ 2642 if (mddev->major_version != 0) { 2643 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", 2644 mdname(mddev)); 2645 return -EINVAL; 2646 } 2647 2648 if (!(info->state & (1<<MD_DISK_FAULTY))) { 2649 int err; 2650 rdev = md_import_device (dev, -1, 0); 2651 if (IS_ERR(rdev)) { 2652 printk(KERN_WARNING 2653 "md: error, md_import_device() returned %ld\n", 2654 PTR_ERR(rdev)); 2655 return PTR_ERR(rdev); 2656 } 2657 rdev->desc_nr = info->number; 2658 if (info->raid_disk < mddev->raid_disks) 2659 rdev->raid_disk = info->raid_disk; 2660 else 2661 rdev->raid_disk = -1; 2662 2663 rdev->flags = 0; 2664 2665 if (rdev->raid_disk < mddev->raid_disks) 2666 if (info->state & (1<<MD_DISK_SYNC)) 2667 set_bit(In_sync, &rdev->flags); 2668 2669 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 2670 set_bit(WriteMostly, &rdev->flags); 2671 2672 err = bind_rdev_to_array(rdev, mddev); 2673 if (err) { 2674 export_rdev(rdev); 2675 return err; 2676 } 2677 2678 if (!mddev->persistent) { 2679 printk(KERN_INFO "md: nonpersistent superblock ...\n"); 2680 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2681 } else 2682 rdev->sb_offset = calc_dev_sboffset(rdev->bdev); 2683 rdev->size = calc_dev_size(rdev, mddev->chunk_size); 2684 2685 if (!mddev->size || (mddev->size > rdev->size)) 2686 mddev->size = rdev->size; 2687 } 2688 2689 return 0; 2690 } 2691 2692 static int hot_remove_disk(mddev_t * mddev, dev_t dev) 2693 { 2694 char b[BDEVNAME_SIZE]; 2695 mdk_rdev_t *rdev; 2696 2697 if (!mddev->pers) 2698 return -ENODEV; 2699 2700 rdev = find_rdev(mddev, dev); 2701 if (!rdev) 2702 return -ENXIO; 2703 2704 if (rdev->raid_disk >= 0) 2705 goto busy; 2706 2707 kick_rdev_from_array(rdev); 2708 md_update_sb(mddev); 2709 2710 return 0; 2711 busy: 2712 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", 2713 bdevname(rdev->bdev,b), mdname(mddev)); 2714 return -EBUSY; 2715 } 2716 2717 static int hot_add_disk(mddev_t * mddev, dev_t dev) 2718 { 2719 char b[BDEVNAME_SIZE]; 2720 int err; 2721 unsigned int size; 2722 mdk_rdev_t *rdev; 2723 2724 if (!mddev->pers) 2725 return -ENODEV; 2726 2727 if (mddev->major_version != 0) { 2728 printk(KERN_WARNING "%s: HOT_ADD may only be used with" 2729 " version-0 superblocks.\n", 2730 mdname(mddev)); 2731 return -EINVAL; 2732 } 2733 if (!mddev->pers->hot_add_disk) { 2734 printk(KERN_WARNING 2735 "%s: personality does not support diskops!\n", 2736 mdname(mddev)); 2737 return -EINVAL; 2738 } 2739 2740 rdev = md_import_device (dev, -1, 0); 2741 if (IS_ERR(rdev)) { 2742 printk(KERN_WARNING 2743 "md: error, md_import_device() returned %ld\n", 2744 PTR_ERR(rdev)); 2745 return -EINVAL; 2746 } 2747 2748 if (mddev->persistent) 2749 rdev->sb_offset = calc_dev_sboffset(rdev->bdev); 2750 else 2751 rdev->sb_offset = 2752 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2753 2754 size = calc_dev_size(rdev, mddev->chunk_size); 2755 rdev->size = size; 2756 2757 if (size < mddev->size) { 2758 printk(KERN_WARNING 2759 "%s: disk size %llu blocks < array size %llu\n", 2760 mdname(mddev), (unsigned long long)size, 2761 (unsigned long long)mddev->size); 2762 err = -ENOSPC; 2763 goto abort_export; 2764 } 2765 2766 if (test_bit(Faulty, &rdev->flags)) { 2767 printk(KERN_WARNING 2768 "md: can not hot-add faulty %s disk to %s!\n", 2769 bdevname(rdev->bdev,b), mdname(mddev)); 2770 err = -EINVAL; 2771 goto abort_export; 2772 } 2773 clear_bit(In_sync, &rdev->flags); 2774 rdev->desc_nr = -1; 2775 bind_rdev_to_array(rdev, mddev); 2776 2777 /* 2778 * The rest should better be atomic, we can have disk failures 2779 * noticed in interrupt contexts ... 2780 */ 2781 2782 if (rdev->desc_nr == mddev->max_disks) { 2783 printk(KERN_WARNING "%s: can not hot-add to full array!\n", 2784 mdname(mddev)); 2785 err = -EBUSY; 2786 goto abort_unbind_export; 2787 } 2788 2789 rdev->raid_disk = -1; 2790 2791 md_update_sb(mddev); 2792 2793 /* 2794 * Kick recovery, maybe this spare has to be added to the 2795 * array immediately. 2796 */ 2797 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2798 md_wakeup_thread(mddev->thread); 2799 2800 return 0; 2801 2802 abort_unbind_export: 2803 unbind_rdev_from_array(rdev); 2804 2805 abort_export: 2806 export_rdev(rdev); 2807 return err; 2808 } 2809 2810 /* similar to deny_write_access, but accounts for our holding a reference 2811 * to the file ourselves */ 2812 static int deny_bitmap_write_access(struct file * file) 2813 { 2814 struct inode *inode = file->f_mapping->host; 2815 2816 spin_lock(&inode->i_lock); 2817 if (atomic_read(&inode->i_writecount) > 1) { 2818 spin_unlock(&inode->i_lock); 2819 return -ETXTBSY; 2820 } 2821 atomic_set(&inode->i_writecount, -1); 2822 spin_unlock(&inode->i_lock); 2823 2824 return 0; 2825 } 2826 2827 static int set_bitmap_file(mddev_t *mddev, int fd) 2828 { 2829 int err; 2830 2831 if (mddev->pers) { 2832 if (!mddev->pers->quiesce) 2833 return -EBUSY; 2834 if (mddev->recovery || mddev->sync_thread) 2835 return -EBUSY; 2836 /* we should be able to change the bitmap.. */ 2837 } 2838 2839 2840 if (fd >= 0) { 2841 if (mddev->bitmap) 2842 return -EEXIST; /* cannot add when bitmap is present */ 2843 mddev->bitmap_file = fget(fd); 2844 2845 if (mddev->bitmap_file == NULL) { 2846 printk(KERN_ERR "%s: error: failed to get bitmap file\n", 2847 mdname(mddev)); 2848 return -EBADF; 2849 } 2850 2851 err = deny_bitmap_write_access(mddev->bitmap_file); 2852 if (err) { 2853 printk(KERN_ERR "%s: error: bitmap file is already in use\n", 2854 mdname(mddev)); 2855 fput(mddev->bitmap_file); 2856 mddev->bitmap_file = NULL; 2857 return err; 2858 } 2859 mddev->bitmap_offset = 0; /* file overrides offset */ 2860 } else if (mddev->bitmap == NULL) 2861 return -ENOENT; /* cannot remove what isn't there */ 2862 err = 0; 2863 if (mddev->pers) { 2864 mddev->pers->quiesce(mddev, 1); 2865 if (fd >= 0) 2866 err = bitmap_create(mddev); 2867 if (fd < 0 || err) 2868 bitmap_destroy(mddev); 2869 mddev->pers->quiesce(mddev, 0); 2870 } else if (fd < 0) { 2871 if (mddev->bitmap_file) 2872 fput(mddev->bitmap_file); 2873 mddev->bitmap_file = NULL; 2874 } 2875 2876 return err; 2877 } 2878 2879 /* 2880 * set_array_info is used two different ways 2881 * The original usage is when creating a new array. 2882 * In this usage, raid_disks is > 0 and it together with 2883 * level, size, not_persistent,layout,chunksize determine the 2884 * shape of the array. 2885 * This will always create an array with a type-0.90.0 superblock. 2886 * The newer usage is when assembling an array. 2887 * In this case raid_disks will be 0, and the major_version field is 2888 * use to determine which style super-blocks are to be found on the devices. 2889 * The minor and patch _version numbers are also kept incase the 2890 * super_block handler wishes to interpret them. 2891 */ 2892 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) 2893 { 2894 2895 if (info->raid_disks == 0) { 2896 /* just setting version number for superblock loading */ 2897 if (info->major_version < 0 || 2898 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || 2899 super_types[info->major_version].name == NULL) { 2900 /* maybe try to auto-load a module? */ 2901 printk(KERN_INFO 2902 "md: superblock version %d not known\n", 2903 info->major_version); 2904 return -EINVAL; 2905 } 2906 mddev->major_version = info->major_version; 2907 mddev->minor_version = info->minor_version; 2908 mddev->patch_version = info->patch_version; 2909 return 0; 2910 } 2911 mddev->major_version = MD_MAJOR_VERSION; 2912 mddev->minor_version = MD_MINOR_VERSION; 2913 mddev->patch_version = MD_PATCHLEVEL_VERSION; 2914 mddev->ctime = get_seconds(); 2915 2916 mddev->level = info->level; 2917 mddev->size = info->size; 2918 mddev->raid_disks = info->raid_disks; 2919 /* don't set md_minor, it is determined by which /dev/md* was 2920 * openned 2921 */ 2922 if (info->state & (1<<MD_SB_CLEAN)) 2923 mddev->recovery_cp = MaxSector; 2924 else 2925 mddev->recovery_cp = 0; 2926 mddev->persistent = ! info->not_persistent; 2927 2928 mddev->layout = info->layout; 2929 mddev->chunk_size = info->chunk_size; 2930 2931 mddev->max_disks = MD_SB_DISKS; 2932 2933 mddev->sb_dirty = 1; 2934 2935 /* 2936 * Generate a 128 bit UUID 2937 */ 2938 get_random_bytes(mddev->uuid, 16); 2939 2940 return 0; 2941 } 2942 2943 /* 2944 * update_array_info is used to change the configuration of an 2945 * on-line array. 2946 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 2947 * fields in the info are checked against the array. 2948 * Any differences that cannot be handled will cause an error. 2949 * Normally, only one change can be managed at a time. 2950 */ 2951 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) 2952 { 2953 int rv = 0; 2954 int cnt = 0; 2955 int state = 0; 2956 2957 /* calculate expected state,ignoring low bits */ 2958 if (mddev->bitmap && mddev->bitmap_offset) 2959 state |= (1 << MD_SB_BITMAP_PRESENT); 2960 2961 if (mddev->major_version != info->major_version || 2962 mddev->minor_version != info->minor_version || 2963 /* mddev->patch_version != info->patch_version || */ 2964 mddev->ctime != info->ctime || 2965 mddev->level != info->level || 2966 /* mddev->layout != info->layout || */ 2967 !mddev->persistent != info->not_persistent|| 2968 mddev->chunk_size != info->chunk_size || 2969 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 2970 ((state^info->state) & 0xfffffe00) 2971 ) 2972 return -EINVAL; 2973 /* Check there is only one change */ 2974 if (mddev->size != info->size) cnt++; 2975 if (mddev->raid_disks != info->raid_disks) cnt++; 2976 if (mddev->layout != info->layout) cnt++; 2977 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; 2978 if (cnt == 0) return 0; 2979 if (cnt > 1) return -EINVAL; 2980 2981 if (mddev->layout != info->layout) { 2982 /* Change layout 2983 * we don't need to do anything at the md level, the 2984 * personality will take care of it all. 2985 */ 2986 if (mddev->pers->reconfig == NULL) 2987 return -EINVAL; 2988 else 2989 return mddev->pers->reconfig(mddev, info->layout, -1); 2990 } 2991 if (mddev->size != info->size) { 2992 mdk_rdev_t * rdev; 2993 struct list_head *tmp; 2994 if (mddev->pers->resize == NULL) 2995 return -EINVAL; 2996 /* The "size" is the amount of each device that is used. 2997 * This can only make sense for arrays with redundancy. 2998 * linear and raid0 always use whatever space is available 2999 * We can only consider changing the size if no resync 3000 * or reconstruction is happening, and if the new size 3001 * is acceptable. It must fit before the sb_offset or, 3002 * if that is <data_offset, it must fit before the 3003 * size of each device. 3004 * If size is zero, we find the largest size that fits. 3005 */ 3006 if (mddev->sync_thread) 3007 return -EBUSY; 3008 ITERATE_RDEV(mddev,rdev,tmp) { 3009 sector_t avail; 3010 int fit = (info->size == 0); 3011 if (rdev->sb_offset > rdev->data_offset) 3012 avail = (rdev->sb_offset*2) - rdev->data_offset; 3013 else 3014 avail = get_capacity(rdev->bdev->bd_disk) 3015 - rdev->data_offset; 3016 if (fit && (info->size == 0 || info->size > avail/2)) 3017 info->size = avail/2; 3018 if (avail < ((sector_t)info->size << 1)) 3019 return -ENOSPC; 3020 } 3021 rv = mddev->pers->resize(mddev, (sector_t)info->size *2); 3022 if (!rv) { 3023 struct block_device *bdev; 3024 3025 bdev = bdget_disk(mddev->gendisk, 0); 3026 if (bdev) { 3027 down(&bdev->bd_inode->i_sem); 3028 i_size_write(bdev->bd_inode, mddev->array_size << 10); 3029 up(&bdev->bd_inode->i_sem); 3030 bdput(bdev); 3031 } 3032 } 3033 } 3034 if (mddev->raid_disks != info->raid_disks) { 3035 /* change the number of raid disks */ 3036 if (mddev->pers->reshape == NULL) 3037 return -EINVAL; 3038 if (info->raid_disks <= 0 || 3039 info->raid_disks >= mddev->max_disks) 3040 return -EINVAL; 3041 if (mddev->sync_thread) 3042 return -EBUSY; 3043 rv = mddev->pers->reshape(mddev, info->raid_disks); 3044 if (!rv) { 3045 struct block_device *bdev; 3046 3047 bdev = bdget_disk(mddev->gendisk, 0); 3048 if (bdev) { 3049 down(&bdev->bd_inode->i_sem); 3050 i_size_write(bdev->bd_inode, mddev->array_size << 10); 3051 up(&bdev->bd_inode->i_sem); 3052 bdput(bdev); 3053 } 3054 } 3055 } 3056 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 3057 if (mddev->pers->quiesce == NULL) 3058 return -EINVAL; 3059 if (mddev->recovery || mddev->sync_thread) 3060 return -EBUSY; 3061 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 3062 /* add the bitmap */ 3063 if (mddev->bitmap) 3064 return -EEXIST; 3065 if (mddev->default_bitmap_offset == 0) 3066 return -EINVAL; 3067 mddev->bitmap_offset = mddev->default_bitmap_offset; 3068 mddev->pers->quiesce(mddev, 1); 3069 rv = bitmap_create(mddev); 3070 if (rv) 3071 bitmap_destroy(mddev); 3072 mddev->pers->quiesce(mddev, 0); 3073 } else { 3074 /* remove the bitmap */ 3075 if (!mddev->bitmap) 3076 return -ENOENT; 3077 if (mddev->bitmap->file) 3078 return -EINVAL; 3079 mddev->pers->quiesce(mddev, 1); 3080 bitmap_destroy(mddev); 3081 mddev->pers->quiesce(mddev, 0); 3082 mddev->bitmap_offset = 0; 3083 } 3084 } 3085 md_update_sb(mddev); 3086 return rv; 3087 } 3088 3089 static int set_disk_faulty(mddev_t *mddev, dev_t dev) 3090 { 3091 mdk_rdev_t *rdev; 3092 3093 if (mddev->pers == NULL) 3094 return -ENODEV; 3095 3096 rdev = find_rdev(mddev, dev); 3097 if (!rdev) 3098 return -ENODEV; 3099 3100 md_error(mddev, rdev); 3101 return 0; 3102 } 3103 3104 static int md_ioctl(struct inode *inode, struct file *file, 3105 unsigned int cmd, unsigned long arg) 3106 { 3107 int err = 0; 3108 void __user *argp = (void __user *)arg; 3109 struct hd_geometry __user *loc = argp; 3110 mddev_t *mddev = NULL; 3111 3112 if (!capable(CAP_SYS_ADMIN)) 3113 return -EACCES; 3114 3115 /* 3116 * Commands dealing with the RAID driver but not any 3117 * particular array: 3118 */ 3119 switch (cmd) 3120 { 3121 case RAID_VERSION: 3122 err = get_version(argp); 3123 goto done; 3124 3125 case PRINT_RAID_DEBUG: 3126 err = 0; 3127 md_print_devices(); 3128 goto done; 3129 3130 #ifndef MODULE 3131 case RAID_AUTORUN: 3132 err = 0; 3133 autostart_arrays(arg); 3134 goto done; 3135 #endif 3136 default:; 3137 } 3138 3139 /* 3140 * Commands creating/starting a new array: 3141 */ 3142 3143 mddev = inode->i_bdev->bd_disk->private_data; 3144 3145 if (!mddev) { 3146 BUG(); 3147 goto abort; 3148 } 3149 3150 3151 if (cmd == START_ARRAY) { 3152 /* START_ARRAY doesn't need to lock the array as autostart_array 3153 * does the locking, and it could even be a different array 3154 */ 3155 static int cnt = 3; 3156 if (cnt > 0 ) { 3157 printk(KERN_WARNING 3158 "md: %s(pid %d) used deprecated START_ARRAY ioctl. " 3159 "This will not be supported beyond 2.6\n", 3160 current->comm, current->pid); 3161 cnt--; 3162 } 3163 err = autostart_array(new_decode_dev(arg)); 3164 if (err) { 3165 printk(KERN_WARNING "md: autostart failed!\n"); 3166 goto abort; 3167 } 3168 goto done; 3169 } 3170 3171 err = mddev_lock(mddev); 3172 if (err) { 3173 printk(KERN_INFO 3174 "md: ioctl lock interrupted, reason %d, cmd %d\n", 3175 err, cmd); 3176 goto abort; 3177 } 3178 3179 switch (cmd) 3180 { 3181 case SET_ARRAY_INFO: 3182 { 3183 mdu_array_info_t info; 3184 if (!arg) 3185 memset(&info, 0, sizeof(info)); 3186 else if (copy_from_user(&info, argp, sizeof(info))) { 3187 err = -EFAULT; 3188 goto abort_unlock; 3189 } 3190 if (mddev->pers) { 3191 err = update_array_info(mddev, &info); 3192 if (err) { 3193 printk(KERN_WARNING "md: couldn't update" 3194 " array info. %d\n", err); 3195 goto abort_unlock; 3196 } 3197 goto done_unlock; 3198 } 3199 if (!list_empty(&mddev->disks)) { 3200 printk(KERN_WARNING 3201 "md: array %s already has disks!\n", 3202 mdname(mddev)); 3203 err = -EBUSY; 3204 goto abort_unlock; 3205 } 3206 if (mddev->raid_disks) { 3207 printk(KERN_WARNING 3208 "md: array %s already initialised!\n", 3209 mdname(mddev)); 3210 err = -EBUSY; 3211 goto abort_unlock; 3212 } 3213 err = set_array_info(mddev, &info); 3214 if (err) { 3215 printk(KERN_WARNING "md: couldn't set" 3216 " array info. %d\n", err); 3217 goto abort_unlock; 3218 } 3219 } 3220 goto done_unlock; 3221 3222 default:; 3223 } 3224 3225 /* 3226 * Commands querying/configuring an existing array: 3227 */ 3228 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 3229 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ 3230 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 3231 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { 3232 err = -ENODEV; 3233 goto abort_unlock; 3234 } 3235 3236 /* 3237 * Commands even a read-only array can execute: 3238 */ 3239 switch (cmd) 3240 { 3241 case GET_ARRAY_INFO: 3242 err = get_array_info(mddev, argp); 3243 goto done_unlock; 3244 3245 case GET_BITMAP_FILE: 3246 err = get_bitmap_file(mddev, argp); 3247 goto done_unlock; 3248 3249 case GET_DISK_INFO: 3250 err = get_disk_info(mddev, argp); 3251 goto done_unlock; 3252 3253 case RESTART_ARRAY_RW: 3254 err = restart_array(mddev); 3255 goto done_unlock; 3256 3257 case STOP_ARRAY: 3258 err = do_md_stop (mddev, 0); 3259 goto done_unlock; 3260 3261 case STOP_ARRAY_RO: 3262 err = do_md_stop (mddev, 1); 3263 goto done_unlock; 3264 3265 /* 3266 * We have a problem here : there is no easy way to give a CHS 3267 * virtual geometry. We currently pretend that we have a 2 heads 3268 * 4 sectors (with a BIG number of cylinders...). This drives 3269 * dosfs just mad... ;-) 3270 */ 3271 case HDIO_GETGEO: 3272 if (!loc) { 3273 err = -EINVAL; 3274 goto abort_unlock; 3275 } 3276 err = put_user (2, (char __user *) &loc->heads); 3277 if (err) 3278 goto abort_unlock; 3279 err = put_user (4, (char __user *) &loc->sectors); 3280 if (err) 3281 goto abort_unlock; 3282 err = put_user(get_capacity(mddev->gendisk)/8, 3283 (short __user *) &loc->cylinders); 3284 if (err) 3285 goto abort_unlock; 3286 err = put_user (get_start_sect(inode->i_bdev), 3287 (long __user *) &loc->start); 3288 goto done_unlock; 3289 } 3290 3291 /* 3292 * The remaining ioctls are changing the state of the 3293 * superblock, so we do not allow them on read-only arrays. 3294 * However non-MD ioctls (e.g. get-size) will still come through 3295 * here and hit the 'default' below, so only disallow 3296 * 'md' ioctls, and switch to rw mode if started auto-readonly. 3297 */ 3298 if (_IOC_TYPE(cmd) == MD_MAJOR && 3299 mddev->ro && mddev->pers) { 3300 if (mddev->ro == 2) { 3301 mddev->ro = 0; 3302 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3303 md_wakeup_thread(mddev->thread); 3304 3305 } else { 3306 err = -EROFS; 3307 goto abort_unlock; 3308 } 3309 } 3310 3311 switch (cmd) 3312 { 3313 case ADD_NEW_DISK: 3314 { 3315 mdu_disk_info_t info; 3316 if (copy_from_user(&info, argp, sizeof(info))) 3317 err = -EFAULT; 3318 else 3319 err = add_new_disk(mddev, &info); 3320 goto done_unlock; 3321 } 3322 3323 case HOT_REMOVE_DISK: 3324 err = hot_remove_disk(mddev, new_decode_dev(arg)); 3325 goto done_unlock; 3326 3327 case HOT_ADD_DISK: 3328 err = hot_add_disk(mddev, new_decode_dev(arg)); 3329 goto done_unlock; 3330 3331 case SET_DISK_FAULTY: 3332 err = set_disk_faulty(mddev, new_decode_dev(arg)); 3333 goto done_unlock; 3334 3335 case RUN_ARRAY: 3336 err = do_md_run (mddev); 3337 goto done_unlock; 3338 3339 case SET_BITMAP_FILE: 3340 err = set_bitmap_file(mddev, (int)arg); 3341 goto done_unlock; 3342 3343 default: 3344 if (_IOC_TYPE(cmd) == MD_MAJOR) 3345 printk(KERN_WARNING "md: %s(pid %d) used" 3346 " obsolete MD ioctl, upgrade your" 3347 " software to use new ictls.\n", 3348 current->comm, current->pid); 3349 err = -EINVAL; 3350 goto abort_unlock; 3351 } 3352 3353 done_unlock: 3354 abort_unlock: 3355 mddev_unlock(mddev); 3356 3357 return err; 3358 done: 3359 if (err) 3360 MD_BUG(); 3361 abort: 3362 return err; 3363 } 3364 3365 static int md_open(struct inode *inode, struct file *file) 3366 { 3367 /* 3368 * Succeed if we can lock the mddev, which confirms that 3369 * it isn't being stopped right now. 3370 */ 3371 mddev_t *mddev = inode->i_bdev->bd_disk->private_data; 3372 int err; 3373 3374 if ((err = mddev_lock(mddev))) 3375 goto out; 3376 3377 err = 0; 3378 mddev_get(mddev); 3379 mddev_unlock(mddev); 3380 3381 check_disk_change(inode->i_bdev); 3382 out: 3383 return err; 3384 } 3385 3386 static int md_release(struct inode *inode, struct file * file) 3387 { 3388 mddev_t *mddev = inode->i_bdev->bd_disk->private_data; 3389 3390 if (!mddev) 3391 BUG(); 3392 mddev_put(mddev); 3393 3394 return 0; 3395 } 3396 3397 static int md_media_changed(struct gendisk *disk) 3398 { 3399 mddev_t *mddev = disk->private_data; 3400 3401 return mddev->changed; 3402 } 3403 3404 static int md_revalidate(struct gendisk *disk) 3405 { 3406 mddev_t *mddev = disk->private_data; 3407 3408 mddev->changed = 0; 3409 return 0; 3410 } 3411 static struct block_device_operations md_fops = 3412 { 3413 .owner = THIS_MODULE, 3414 .open = md_open, 3415 .release = md_release, 3416 .ioctl = md_ioctl, 3417 .media_changed = md_media_changed, 3418 .revalidate_disk= md_revalidate, 3419 }; 3420 3421 static int md_thread(void * arg) 3422 { 3423 mdk_thread_t *thread = arg; 3424 3425 /* 3426 * md_thread is a 'system-thread', it's priority should be very 3427 * high. We avoid resource deadlocks individually in each 3428 * raid personality. (RAID5 does preallocation) We also use RR and 3429 * the very same RT priority as kswapd, thus we will never get 3430 * into a priority inversion deadlock. 3431 * 3432 * we definitely have to have equal or higher priority than 3433 * bdflush, otherwise bdflush will deadlock if there are too 3434 * many dirty RAID5 blocks. 3435 */ 3436 3437 allow_signal(SIGKILL); 3438 while (!kthread_should_stop()) { 3439 3440 wait_event_timeout(thread->wqueue, 3441 test_bit(THREAD_WAKEUP, &thread->flags) 3442 || kthread_should_stop(), 3443 thread->timeout); 3444 try_to_freeze(); 3445 3446 clear_bit(THREAD_WAKEUP, &thread->flags); 3447 3448 thread->run(thread->mddev); 3449 } 3450 3451 return 0; 3452 } 3453 3454 void md_wakeup_thread(mdk_thread_t *thread) 3455 { 3456 if (thread) { 3457 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); 3458 set_bit(THREAD_WAKEUP, &thread->flags); 3459 wake_up(&thread->wqueue); 3460 } 3461 } 3462 3463 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, 3464 const char *name) 3465 { 3466 mdk_thread_t *thread; 3467 3468 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL); 3469 if (!thread) 3470 return NULL; 3471 3472 memset(thread, 0, sizeof(mdk_thread_t)); 3473 init_waitqueue_head(&thread->wqueue); 3474 3475 thread->run = run; 3476 thread->mddev = mddev; 3477 thread->timeout = MAX_SCHEDULE_TIMEOUT; 3478 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); 3479 if (IS_ERR(thread->tsk)) { 3480 kfree(thread); 3481 return NULL; 3482 } 3483 return thread; 3484 } 3485 3486 void md_unregister_thread(mdk_thread_t *thread) 3487 { 3488 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); 3489 3490 kthread_stop(thread->tsk); 3491 kfree(thread); 3492 } 3493 3494 void md_error(mddev_t *mddev, mdk_rdev_t *rdev) 3495 { 3496 if (!mddev) { 3497 MD_BUG(); 3498 return; 3499 } 3500 3501 if (!rdev || test_bit(Faulty, &rdev->flags)) 3502 return; 3503 /* 3504 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", 3505 mdname(mddev), 3506 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), 3507 __builtin_return_address(0),__builtin_return_address(1), 3508 __builtin_return_address(2),__builtin_return_address(3)); 3509 */ 3510 if (!mddev->pers->error_handler) 3511 return; 3512 mddev->pers->error_handler(mddev,rdev); 3513 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 3514 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3515 md_wakeup_thread(mddev->thread); 3516 } 3517 3518 /* seq_file implementation /proc/mdstat */ 3519 3520 static void status_unused(struct seq_file *seq) 3521 { 3522 int i = 0; 3523 mdk_rdev_t *rdev; 3524 struct list_head *tmp; 3525 3526 seq_printf(seq, "unused devices: "); 3527 3528 ITERATE_RDEV_PENDING(rdev,tmp) { 3529 char b[BDEVNAME_SIZE]; 3530 i++; 3531 seq_printf(seq, "%s ", 3532 bdevname(rdev->bdev,b)); 3533 } 3534 if (!i) 3535 seq_printf(seq, "<none>"); 3536 3537 seq_printf(seq, "\n"); 3538 } 3539 3540 3541 static void status_resync(struct seq_file *seq, mddev_t * mddev) 3542 { 3543 unsigned long max_blocks, resync, res, dt, db, rt; 3544 3545 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; 3546 3547 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 3548 max_blocks = mddev->resync_max_sectors >> 1; 3549 else 3550 max_blocks = mddev->size; 3551 3552 /* 3553 * Should not happen. 3554 */ 3555 if (!max_blocks) { 3556 MD_BUG(); 3557 return; 3558 } 3559 res = (resync/1024)*1000/(max_blocks/1024 + 1); 3560 { 3561 int i, x = res/50, y = 20-x; 3562 seq_printf(seq, "["); 3563 for (i = 0; i < x; i++) 3564 seq_printf(seq, "="); 3565 seq_printf(seq, ">"); 3566 for (i = 0; i < y; i++) 3567 seq_printf(seq, "."); 3568 seq_printf(seq, "] "); 3569 } 3570 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", 3571 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 3572 "resync" : "recovery"), 3573 res/10, res % 10, resync, max_blocks); 3574 3575 /* 3576 * We do not want to overflow, so the order of operands and 3577 * the * 100 / 100 trick are important. We do a +1 to be 3578 * safe against division by zero. We only estimate anyway. 3579 * 3580 * dt: time from mark until now 3581 * db: blocks written from mark until now 3582 * rt: remaining time 3583 */ 3584 dt = ((jiffies - mddev->resync_mark) / HZ); 3585 if (!dt) dt++; 3586 db = resync - (mddev->resync_mark_cnt/2); 3587 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; 3588 3589 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); 3590 3591 seq_printf(seq, " speed=%ldK/sec", db/dt); 3592 } 3593 3594 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 3595 { 3596 struct list_head *tmp; 3597 loff_t l = *pos; 3598 mddev_t *mddev; 3599 3600 if (l >= 0x10000) 3601 return NULL; 3602 if (!l--) 3603 /* header */ 3604 return (void*)1; 3605 3606 spin_lock(&all_mddevs_lock); 3607 list_for_each(tmp,&all_mddevs) 3608 if (!l--) { 3609 mddev = list_entry(tmp, mddev_t, all_mddevs); 3610 mddev_get(mddev); 3611 spin_unlock(&all_mddevs_lock); 3612 return mddev; 3613 } 3614 spin_unlock(&all_mddevs_lock); 3615 if (!l--) 3616 return (void*)2;/* tail */ 3617 return NULL; 3618 } 3619 3620 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3621 { 3622 struct list_head *tmp; 3623 mddev_t *next_mddev, *mddev = v; 3624 3625 ++*pos; 3626 if (v == (void*)2) 3627 return NULL; 3628 3629 spin_lock(&all_mddevs_lock); 3630 if (v == (void*)1) 3631 tmp = all_mddevs.next; 3632 else 3633 tmp = mddev->all_mddevs.next; 3634 if (tmp != &all_mddevs) 3635 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); 3636 else { 3637 next_mddev = (void*)2; 3638 *pos = 0x10000; 3639 } 3640 spin_unlock(&all_mddevs_lock); 3641 3642 if (v != (void*)1) 3643 mddev_put(mddev); 3644 return next_mddev; 3645 3646 } 3647 3648 static void md_seq_stop(struct seq_file *seq, void *v) 3649 { 3650 mddev_t *mddev = v; 3651 3652 if (mddev && v != (void*)1 && v != (void*)2) 3653 mddev_put(mddev); 3654 } 3655 3656 static int md_seq_show(struct seq_file *seq, void *v) 3657 { 3658 mddev_t *mddev = v; 3659 sector_t size; 3660 struct list_head *tmp2; 3661 mdk_rdev_t *rdev; 3662 int i; 3663 struct bitmap *bitmap; 3664 3665 if (v == (void*)1) { 3666 seq_printf(seq, "Personalities : "); 3667 spin_lock(&pers_lock); 3668 for (i = 0; i < MAX_PERSONALITY; i++) 3669 if (pers[i]) 3670 seq_printf(seq, "[%s] ", pers[i]->name); 3671 3672 spin_unlock(&pers_lock); 3673 seq_printf(seq, "\n"); 3674 return 0; 3675 } 3676 if (v == (void*)2) { 3677 status_unused(seq); 3678 return 0; 3679 } 3680 3681 if (mddev_lock(mddev)!=0) 3682 return -EINTR; 3683 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 3684 seq_printf(seq, "%s : %sactive", mdname(mddev), 3685 mddev->pers ? "" : "in"); 3686 if (mddev->pers) { 3687 if (mddev->ro==1) 3688 seq_printf(seq, " (read-only)"); 3689 if (mddev->ro==2) 3690 seq_printf(seq, "(auto-read-only)"); 3691 seq_printf(seq, " %s", mddev->pers->name); 3692 } 3693 3694 size = 0; 3695 ITERATE_RDEV(mddev,rdev,tmp2) { 3696 char b[BDEVNAME_SIZE]; 3697 seq_printf(seq, " %s[%d]", 3698 bdevname(rdev->bdev,b), rdev->desc_nr); 3699 if (test_bit(WriteMostly, &rdev->flags)) 3700 seq_printf(seq, "(W)"); 3701 if (test_bit(Faulty, &rdev->flags)) { 3702 seq_printf(seq, "(F)"); 3703 continue; 3704 } else if (rdev->raid_disk < 0) 3705 seq_printf(seq, "(S)"); /* spare */ 3706 size += rdev->size; 3707 } 3708 3709 if (!list_empty(&mddev->disks)) { 3710 if (mddev->pers) 3711 seq_printf(seq, "\n %llu blocks", 3712 (unsigned long long)mddev->array_size); 3713 else 3714 seq_printf(seq, "\n %llu blocks", 3715 (unsigned long long)size); 3716 } 3717 if (mddev->persistent) { 3718 if (mddev->major_version != 0 || 3719 mddev->minor_version != 90) { 3720 seq_printf(seq," super %d.%d", 3721 mddev->major_version, 3722 mddev->minor_version); 3723 } 3724 } else 3725 seq_printf(seq, " super non-persistent"); 3726 3727 if (mddev->pers) { 3728 mddev->pers->status (seq, mddev); 3729 seq_printf(seq, "\n "); 3730 if (mddev->pers->sync_request) { 3731 if (mddev->curr_resync > 2) { 3732 status_resync (seq, mddev); 3733 seq_printf(seq, "\n "); 3734 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) 3735 seq_printf(seq, "\tresync=DELAYED\n "); 3736 else if (mddev->recovery_cp < MaxSector) 3737 seq_printf(seq, "\tresync=PENDING\n "); 3738 } 3739 } else 3740 seq_printf(seq, "\n "); 3741 3742 if ((bitmap = mddev->bitmap)) { 3743 unsigned long chunk_kb; 3744 unsigned long flags; 3745 spin_lock_irqsave(&bitmap->lock, flags); 3746 chunk_kb = bitmap->chunksize >> 10; 3747 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " 3748 "%lu%s chunk", 3749 bitmap->pages - bitmap->missing_pages, 3750 bitmap->pages, 3751 (bitmap->pages - bitmap->missing_pages) 3752 << (PAGE_SHIFT - 10), 3753 chunk_kb ? chunk_kb : bitmap->chunksize, 3754 chunk_kb ? "KB" : "B"); 3755 if (bitmap->file) { 3756 seq_printf(seq, ", file: "); 3757 seq_path(seq, bitmap->file->f_vfsmnt, 3758 bitmap->file->f_dentry," \t\n"); 3759 } 3760 3761 seq_printf(seq, "\n"); 3762 spin_unlock_irqrestore(&bitmap->lock, flags); 3763 } 3764 3765 seq_printf(seq, "\n"); 3766 } 3767 mddev_unlock(mddev); 3768 3769 return 0; 3770 } 3771 3772 static struct seq_operations md_seq_ops = { 3773 .start = md_seq_start, 3774 .next = md_seq_next, 3775 .stop = md_seq_stop, 3776 .show = md_seq_show, 3777 }; 3778 3779 static int md_seq_open(struct inode *inode, struct file *file) 3780 { 3781 int error; 3782 3783 error = seq_open(file, &md_seq_ops); 3784 return error; 3785 } 3786 3787 static struct file_operations md_seq_fops = { 3788 .open = md_seq_open, 3789 .read = seq_read, 3790 .llseek = seq_lseek, 3791 .release = seq_release, 3792 }; 3793 3794 int register_md_personality(int pnum, mdk_personality_t *p) 3795 { 3796 if (pnum >= MAX_PERSONALITY) { 3797 printk(KERN_ERR 3798 "md: tried to install personality %s as nr %d, but max is %lu\n", 3799 p->name, pnum, MAX_PERSONALITY-1); 3800 return -EINVAL; 3801 } 3802 3803 spin_lock(&pers_lock); 3804 if (pers[pnum]) { 3805 spin_unlock(&pers_lock); 3806 return -EBUSY; 3807 } 3808 3809 pers[pnum] = p; 3810 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum); 3811 spin_unlock(&pers_lock); 3812 return 0; 3813 } 3814 3815 int unregister_md_personality(int pnum) 3816 { 3817 if (pnum >= MAX_PERSONALITY) 3818 return -EINVAL; 3819 3820 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name); 3821 spin_lock(&pers_lock); 3822 pers[pnum] = NULL; 3823 spin_unlock(&pers_lock); 3824 return 0; 3825 } 3826 3827 static int is_mddev_idle(mddev_t *mddev) 3828 { 3829 mdk_rdev_t * rdev; 3830 struct list_head *tmp; 3831 int idle; 3832 unsigned long curr_events; 3833 3834 idle = 1; 3835 ITERATE_RDEV(mddev,rdev,tmp) { 3836 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 3837 curr_events = disk_stat_read(disk, sectors[0]) + 3838 disk_stat_read(disk, sectors[1]) - 3839 atomic_read(&disk->sync_io); 3840 /* Allow some slack between valud of curr_events and last_events, 3841 * as there are some uninteresting races. 3842 * Note: the following is an unsigned comparison. 3843 */ 3844 if ((curr_events - rdev->last_events + 32) > 64) { 3845 rdev->last_events = curr_events; 3846 idle = 0; 3847 } 3848 } 3849 return idle; 3850 } 3851 3852 void md_done_sync(mddev_t *mddev, int blocks, int ok) 3853 { 3854 /* another "blocks" (512byte) blocks have been synced */ 3855 atomic_sub(blocks, &mddev->recovery_active); 3856 wake_up(&mddev->recovery_wait); 3857 if (!ok) { 3858 set_bit(MD_RECOVERY_ERR, &mddev->recovery); 3859 md_wakeup_thread(mddev->thread); 3860 // stop recovery, signal do_sync .... 3861 } 3862 } 3863 3864 3865 /* md_write_start(mddev, bi) 3866 * If we need to update some array metadata (e.g. 'active' flag 3867 * in superblock) before writing, schedule a superblock update 3868 * and wait for it to complete. 3869 */ 3870 void md_write_start(mddev_t *mddev, struct bio *bi) 3871 { 3872 if (bio_data_dir(bi) != WRITE) 3873 return; 3874 3875 BUG_ON(mddev->ro == 1); 3876 if (mddev->ro == 2) { 3877 /* need to switch to read/write */ 3878 mddev->ro = 0; 3879 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3880 md_wakeup_thread(mddev->thread); 3881 } 3882 atomic_inc(&mddev->writes_pending); 3883 if (mddev->in_sync) { 3884 spin_lock_irq(&mddev->write_lock); 3885 if (mddev->in_sync) { 3886 mddev->in_sync = 0; 3887 mddev->sb_dirty = 1; 3888 md_wakeup_thread(mddev->thread); 3889 } 3890 spin_unlock_irq(&mddev->write_lock); 3891 } 3892 wait_event(mddev->sb_wait, mddev->sb_dirty==0); 3893 } 3894 3895 void md_write_end(mddev_t *mddev) 3896 { 3897 if (atomic_dec_and_test(&mddev->writes_pending)) { 3898 if (mddev->safemode == 2) 3899 md_wakeup_thread(mddev->thread); 3900 else 3901 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 3902 } 3903 } 3904 3905 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 3906 3907 #define SYNC_MARKS 10 3908 #define SYNC_MARK_STEP (3*HZ) 3909 static void md_do_sync(mddev_t *mddev) 3910 { 3911 mddev_t *mddev2; 3912 unsigned int currspeed = 0, 3913 window; 3914 sector_t max_sectors,j, io_sectors; 3915 unsigned long mark[SYNC_MARKS]; 3916 sector_t mark_cnt[SYNC_MARKS]; 3917 int last_mark,m; 3918 struct list_head *tmp; 3919 sector_t last_check; 3920 int skipped = 0; 3921 3922 /* just incase thread restarts... */ 3923 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 3924 return; 3925 3926 /* we overload curr_resync somewhat here. 3927 * 0 == not engaged in resync at all 3928 * 2 == checking that there is no conflict with another sync 3929 * 1 == like 2, but have yielded to allow conflicting resync to 3930 * commense 3931 * other == active in resync - this many blocks 3932 * 3933 * Before starting a resync we must have set curr_resync to 3934 * 2, and then checked that every "conflicting" array has curr_resync 3935 * less than ours. When we find one that is the same or higher 3936 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 3937 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 3938 * This will mean we have to start checking from the beginning again. 3939 * 3940 */ 3941 3942 do { 3943 mddev->curr_resync = 2; 3944 3945 try_again: 3946 if (kthread_should_stop()) { 3947 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 3948 goto skip; 3949 } 3950 ITERATE_MDDEV(mddev2,tmp) { 3951 if (mddev2 == mddev) 3952 continue; 3953 if (mddev2->curr_resync && 3954 match_mddev_units(mddev,mddev2)) { 3955 DEFINE_WAIT(wq); 3956 if (mddev < mddev2 && mddev->curr_resync == 2) { 3957 /* arbitrarily yield */ 3958 mddev->curr_resync = 1; 3959 wake_up(&resync_wait); 3960 } 3961 if (mddev > mddev2 && mddev->curr_resync == 1) 3962 /* no need to wait here, we can wait the next 3963 * time 'round when curr_resync == 2 3964 */ 3965 continue; 3966 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); 3967 if (!kthread_should_stop() && 3968 mddev2->curr_resync >= mddev->curr_resync) { 3969 printk(KERN_INFO "md: delaying resync of %s" 3970 " until %s has finished resync (they" 3971 " share one or more physical units)\n", 3972 mdname(mddev), mdname(mddev2)); 3973 mddev_put(mddev2); 3974 schedule(); 3975 finish_wait(&resync_wait, &wq); 3976 goto try_again; 3977 } 3978 finish_wait(&resync_wait, &wq); 3979 } 3980 } 3981 } while (mddev->curr_resync < 2); 3982 3983 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 3984 /* resync follows the size requested by the personality, 3985 * which defaults to physical size, but can be virtual size 3986 */ 3987 max_sectors = mddev->resync_max_sectors; 3988 mddev->resync_mismatches = 0; 3989 } else 3990 /* recovery follows the physical size of devices */ 3991 max_sectors = mddev->size << 1; 3992 3993 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); 3994 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" 3995 " %d KB/sec/disc.\n", sysctl_speed_limit_min); 3996 printk(KERN_INFO "md: using maximum available idle IO bandwidth " 3997 "(but not more than %d KB/sec) for reconstruction.\n", 3998 sysctl_speed_limit_max); 3999 4000 is_mddev_idle(mddev); /* this also initializes IO event counters */ 4001 /* we don't use the checkpoint if there's a bitmap */ 4002 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap 4003 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 4004 j = mddev->recovery_cp; 4005 else 4006 j = 0; 4007 io_sectors = 0; 4008 for (m = 0; m < SYNC_MARKS; m++) { 4009 mark[m] = jiffies; 4010 mark_cnt[m] = io_sectors; 4011 } 4012 last_mark = 0; 4013 mddev->resync_mark = mark[last_mark]; 4014 mddev->resync_mark_cnt = mark_cnt[last_mark]; 4015 4016 /* 4017 * Tune reconstruction: 4018 */ 4019 window = 32*(PAGE_SIZE/512); 4020 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", 4021 window/2,(unsigned long long) max_sectors/2); 4022 4023 atomic_set(&mddev->recovery_active, 0); 4024 init_waitqueue_head(&mddev->recovery_wait); 4025 last_check = 0; 4026 4027 if (j>2) { 4028 printk(KERN_INFO 4029 "md: resuming recovery of %s from checkpoint.\n", 4030 mdname(mddev)); 4031 mddev->curr_resync = j; 4032 } 4033 4034 while (j < max_sectors) { 4035 sector_t sectors; 4036 4037 skipped = 0; 4038 sectors = mddev->pers->sync_request(mddev, j, &skipped, 4039 currspeed < sysctl_speed_limit_min); 4040 if (sectors == 0) { 4041 set_bit(MD_RECOVERY_ERR, &mddev->recovery); 4042 goto out; 4043 } 4044 4045 if (!skipped) { /* actual IO requested */ 4046 io_sectors += sectors; 4047 atomic_add(sectors, &mddev->recovery_active); 4048 } 4049 4050 j += sectors; 4051 if (j>1) mddev->curr_resync = j; 4052 4053 4054 if (last_check + window > io_sectors || j == max_sectors) 4055 continue; 4056 4057 last_check = io_sectors; 4058 4059 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || 4060 test_bit(MD_RECOVERY_ERR, &mddev->recovery)) 4061 break; 4062 4063 repeat: 4064 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 4065 /* step marks */ 4066 int next = (last_mark+1) % SYNC_MARKS; 4067 4068 mddev->resync_mark = mark[next]; 4069 mddev->resync_mark_cnt = mark_cnt[next]; 4070 mark[next] = jiffies; 4071 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 4072 last_mark = next; 4073 } 4074 4075 4076 if (kthread_should_stop()) { 4077 /* 4078 * got a signal, exit. 4079 */ 4080 printk(KERN_INFO 4081 "md: md_do_sync() got signal ... exiting\n"); 4082 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4083 goto out; 4084 } 4085 4086 /* 4087 * this loop exits only if either when we are slower than 4088 * the 'hard' speed limit, or the system was IO-idle for 4089 * a jiffy. 4090 * the system might be non-idle CPU-wise, but we only care 4091 * about not overloading the IO subsystem. (things like an 4092 * e2fsck being done on the RAID array should execute fast) 4093 */ 4094 mddev->queue->unplug_fn(mddev->queue); 4095 cond_resched(); 4096 4097 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 4098 /((jiffies-mddev->resync_mark)/HZ +1) +1; 4099 4100 if (currspeed > sysctl_speed_limit_min) { 4101 if ((currspeed > sysctl_speed_limit_max) || 4102 !is_mddev_idle(mddev)) { 4103 msleep(250); 4104 goto repeat; 4105 } 4106 } 4107 } 4108 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); 4109 /* 4110 * this also signals 'finished resyncing' to md_stop 4111 */ 4112 out: 4113 mddev->queue->unplug_fn(mddev->queue); 4114 4115 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 4116 4117 /* tell personality that we are finished */ 4118 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); 4119 4120 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && 4121 mddev->curr_resync > 2 && 4122 mddev->curr_resync >= mddev->recovery_cp) { 4123 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 4124 printk(KERN_INFO 4125 "md: checkpointing recovery of %s.\n", 4126 mdname(mddev)); 4127 mddev->recovery_cp = mddev->curr_resync; 4128 } else 4129 mddev->recovery_cp = MaxSector; 4130 } 4131 4132 skip: 4133 mddev->curr_resync = 0; 4134 wake_up(&resync_wait); 4135 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 4136 md_wakeup_thread(mddev->thread); 4137 } 4138 4139 4140 /* 4141 * This routine is regularly called by all per-raid-array threads to 4142 * deal with generic issues like resync and super-block update. 4143 * Raid personalities that don't have a thread (linear/raid0) do not 4144 * need this as they never do any recovery or update the superblock. 4145 * 4146 * It does not do any resync itself, but rather "forks" off other threads 4147 * to do that as needed. 4148 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 4149 * "->recovery" and create a thread at ->sync_thread. 4150 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) 4151 * and wakeups up this thread which will reap the thread and finish up. 4152 * This thread also removes any faulty devices (with nr_pending == 0). 4153 * 4154 * The overall approach is: 4155 * 1/ if the superblock needs updating, update it. 4156 * 2/ If a recovery thread is running, don't do anything else. 4157 * 3/ If recovery has finished, clean up, possibly marking spares active. 4158 * 4/ If there are any faulty devices, remove them. 4159 * 5/ If array is degraded, try to add spares devices 4160 * 6/ If array has spares or is not in-sync, start a resync thread. 4161 */ 4162 void md_check_recovery(mddev_t *mddev) 4163 { 4164 mdk_rdev_t *rdev; 4165 struct list_head *rtmp; 4166 4167 4168 if (mddev->bitmap) 4169 bitmap_daemon_work(mddev->bitmap); 4170 4171 if (mddev->ro) 4172 return; 4173 4174 if (signal_pending(current)) { 4175 if (mddev->pers->sync_request) { 4176 printk(KERN_INFO "md: %s in immediate safe mode\n", 4177 mdname(mddev)); 4178 mddev->safemode = 2; 4179 } 4180 flush_signals(current); 4181 } 4182 4183 if ( ! ( 4184 mddev->sb_dirty || 4185 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 4186 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 4187 (mddev->safemode == 1) || 4188 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 4189 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 4190 )) 4191 return; 4192 4193 if (mddev_trylock(mddev)==0) { 4194 int spares =0; 4195 4196 spin_lock_irq(&mddev->write_lock); 4197 if (mddev->safemode && !atomic_read(&mddev->writes_pending) && 4198 !mddev->in_sync && mddev->recovery_cp == MaxSector) { 4199 mddev->in_sync = 1; 4200 mddev->sb_dirty = 1; 4201 } 4202 if (mddev->safemode == 1) 4203 mddev->safemode = 0; 4204 spin_unlock_irq(&mddev->write_lock); 4205 4206 if (mddev->sb_dirty) 4207 md_update_sb(mddev); 4208 4209 4210 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 4211 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 4212 /* resync/recovery still happening */ 4213 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4214 goto unlock; 4215 } 4216 if (mddev->sync_thread) { 4217 /* resync has finished, collect result */ 4218 md_unregister_thread(mddev->sync_thread); 4219 mddev->sync_thread = NULL; 4220 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && 4221 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 4222 /* success...*/ 4223 /* activate any spares */ 4224 mddev->pers->spare_active(mddev); 4225 } 4226 md_update_sb(mddev); 4227 4228 /* if array is no-longer degraded, then any saved_raid_disk 4229 * information must be scrapped 4230 */ 4231 if (!mddev->degraded) 4232 ITERATE_RDEV(mddev,rdev,rtmp) 4233 rdev->saved_raid_disk = -1; 4234 4235 mddev->recovery = 0; 4236 /* flag recovery needed just to double check */ 4237 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4238 goto unlock; 4239 } 4240 /* Clear some bits that don't mean anything, but 4241 * might be left set 4242 */ 4243 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4244 clear_bit(MD_RECOVERY_ERR, &mddev->recovery); 4245 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 4246 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 4247 4248 /* no recovery is running. 4249 * remove any failed drives, then 4250 * add spares if possible. 4251 * Spare are also removed and re-added, to allow 4252 * the personality to fail the re-add. 4253 */ 4254 ITERATE_RDEV(mddev,rdev,rtmp) 4255 if (rdev->raid_disk >= 0 && 4256 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && 4257 atomic_read(&rdev->nr_pending)==0) { 4258 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { 4259 char nm[20]; 4260 sprintf(nm,"rd%d", rdev->raid_disk); 4261 sysfs_remove_link(&mddev->kobj, nm); 4262 rdev->raid_disk = -1; 4263 } 4264 } 4265 4266 if (mddev->degraded) { 4267 ITERATE_RDEV(mddev,rdev,rtmp) 4268 if (rdev->raid_disk < 0 4269 && !test_bit(Faulty, &rdev->flags)) { 4270 if (mddev->pers->hot_add_disk(mddev,rdev)) { 4271 char nm[20]; 4272 sprintf(nm, "rd%d", rdev->raid_disk); 4273 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 4274 spares++; 4275 } else 4276 break; 4277 } 4278 } 4279 4280 if (spares) { 4281 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4282 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4283 } else if (mddev->recovery_cp < MaxSector) { 4284 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4285 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 4286 /* nothing to be done ... */ 4287 goto unlock; 4288 4289 if (mddev->pers->sync_request) { 4290 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 4291 if (spares && mddev->bitmap && ! mddev->bitmap->file) { 4292 /* We are adding a device or devices to an array 4293 * which has the bitmap stored on all devices. 4294 * So make sure all bitmap pages get written 4295 */ 4296 bitmap_write_all(mddev->bitmap); 4297 } 4298 mddev->sync_thread = md_register_thread(md_do_sync, 4299 mddev, 4300 "%s_resync"); 4301 if (!mddev->sync_thread) { 4302 printk(KERN_ERR "%s: could not start resync" 4303 " thread...\n", 4304 mdname(mddev)); 4305 /* leave the spares where they are, it shouldn't hurt */ 4306 mddev->recovery = 0; 4307 } else { 4308 md_wakeup_thread(mddev->sync_thread); 4309 } 4310 } 4311 unlock: 4312 mddev_unlock(mddev); 4313 } 4314 } 4315 4316 static int md_notify_reboot(struct notifier_block *this, 4317 unsigned long code, void *x) 4318 { 4319 struct list_head *tmp; 4320 mddev_t *mddev; 4321 4322 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { 4323 4324 printk(KERN_INFO "md: stopping all md devices.\n"); 4325 4326 ITERATE_MDDEV(mddev,tmp) 4327 if (mddev_trylock(mddev)==0) 4328 do_md_stop (mddev, 1); 4329 /* 4330 * certain more exotic SCSI devices are known to be 4331 * volatile wrt too early system reboots. While the 4332 * right place to handle this issue is the given 4333 * driver, we do want to have a safe RAID driver ... 4334 */ 4335 mdelay(1000*1); 4336 } 4337 return NOTIFY_DONE; 4338 } 4339 4340 static struct notifier_block md_notifier = { 4341 .notifier_call = md_notify_reboot, 4342 .next = NULL, 4343 .priority = INT_MAX, /* before any real devices */ 4344 }; 4345 4346 static void md_geninit(void) 4347 { 4348 struct proc_dir_entry *p; 4349 4350 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 4351 4352 p = create_proc_entry("mdstat", S_IRUGO, NULL); 4353 if (p) 4354 p->proc_fops = &md_seq_fops; 4355 } 4356 4357 static int __init md_init(void) 4358 { 4359 int minor; 4360 4361 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," 4362 " MD_SB_DISKS=%d\n", 4363 MD_MAJOR_VERSION, MD_MINOR_VERSION, 4364 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); 4365 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, 4366 BITMAP_MINOR); 4367 4368 if (register_blkdev(MAJOR_NR, "md")) 4369 return -1; 4370 if ((mdp_major=register_blkdev(0, "mdp"))<=0) { 4371 unregister_blkdev(MAJOR_NR, "md"); 4372 return -1; 4373 } 4374 devfs_mk_dir("md"); 4375 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, 4376 md_probe, NULL, NULL); 4377 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, 4378 md_probe, NULL, NULL); 4379 4380 for (minor=0; minor < MAX_MD_DEVS; ++minor) 4381 devfs_mk_bdev(MKDEV(MAJOR_NR, minor), 4382 S_IFBLK|S_IRUSR|S_IWUSR, 4383 "md/%d", minor); 4384 4385 for (minor=0; minor < MAX_MD_DEVS; ++minor) 4386 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), 4387 S_IFBLK|S_IRUSR|S_IWUSR, 4388 "md/mdp%d", minor); 4389 4390 4391 register_reboot_notifier(&md_notifier); 4392 raid_table_header = register_sysctl_table(raid_root_table, 1); 4393 4394 md_geninit(); 4395 return (0); 4396 } 4397 4398 4399 #ifndef MODULE 4400 4401 /* 4402 * Searches all registered partitions for autorun RAID arrays 4403 * at boot time. 4404 */ 4405 static dev_t detected_devices[128]; 4406 static int dev_cnt; 4407 4408 void md_autodetect_dev(dev_t dev) 4409 { 4410 if (dev_cnt >= 0 && dev_cnt < 127) 4411 detected_devices[dev_cnt++] = dev; 4412 } 4413 4414 4415 static void autostart_arrays(int part) 4416 { 4417 mdk_rdev_t *rdev; 4418 int i; 4419 4420 printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); 4421 4422 for (i = 0; i < dev_cnt; i++) { 4423 dev_t dev = detected_devices[i]; 4424 4425 rdev = md_import_device(dev,0, 0); 4426 if (IS_ERR(rdev)) 4427 continue; 4428 4429 if (test_bit(Faulty, &rdev->flags)) { 4430 MD_BUG(); 4431 continue; 4432 } 4433 list_add(&rdev->same_set, &pending_raid_disks); 4434 } 4435 dev_cnt = 0; 4436 4437 autorun_devices(part); 4438 } 4439 4440 #endif 4441 4442 static __exit void md_exit(void) 4443 { 4444 mddev_t *mddev; 4445 struct list_head *tmp; 4446 int i; 4447 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); 4448 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); 4449 for (i=0; i < MAX_MD_DEVS; i++) 4450 devfs_remove("md/%d", i); 4451 for (i=0; i < MAX_MD_DEVS; i++) 4452 devfs_remove("md/d%d", i); 4453 4454 devfs_remove("md"); 4455 4456 unregister_blkdev(MAJOR_NR,"md"); 4457 unregister_blkdev(mdp_major, "mdp"); 4458 unregister_reboot_notifier(&md_notifier); 4459 unregister_sysctl_table(raid_table_header); 4460 remove_proc_entry("mdstat", NULL); 4461 ITERATE_MDDEV(mddev,tmp) { 4462 struct gendisk *disk = mddev->gendisk; 4463 if (!disk) 4464 continue; 4465 export_array(mddev); 4466 del_gendisk(disk); 4467 put_disk(disk); 4468 mddev->gendisk = NULL; 4469 mddev_put(mddev); 4470 } 4471 } 4472 4473 module_init(md_init) 4474 module_exit(md_exit) 4475 4476 static int get_ro(char *buffer, struct kernel_param *kp) 4477 { 4478 return sprintf(buffer, "%d", start_readonly); 4479 } 4480 static int set_ro(const char *val, struct kernel_param *kp) 4481 { 4482 char *e; 4483 int num = simple_strtoul(val, &e, 10); 4484 if (*val && (*e == '\0' || *e == '\n')) { 4485 start_readonly = num; 4486 return 0;; 4487 } 4488 return -EINVAL; 4489 } 4490 4491 module_param_call(start_ro, set_ro, get_ro, NULL, 0600); 4492 4493 EXPORT_SYMBOL(register_md_personality); 4494 EXPORT_SYMBOL(unregister_md_personality); 4495 EXPORT_SYMBOL(md_error); 4496 EXPORT_SYMBOL(md_done_sync); 4497 EXPORT_SYMBOL(md_write_start); 4498 EXPORT_SYMBOL(md_write_end); 4499 EXPORT_SYMBOL(md_register_thread); 4500 EXPORT_SYMBOL(md_unregister_thread); 4501 EXPORT_SYMBOL(md_wakeup_thread); 4502 EXPORT_SYMBOL(md_print_devices); 4503 EXPORT_SYMBOL(md_check_recovery); 4504 MODULE_LICENSE("GPL"); 4505 MODULE_ALIAS("md"); 4506 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 4507