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 = 1024; 1032 1033 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1034 memcpy(mddev->uuid, sb->set_uuid, 16); 1035 1036 mddev->max_disks = (4096-256)/2; 1037 1038 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1039 mddev->bitmap_file == NULL ) { 1040 if (mddev->level != 1) { 1041 printk(KERN_WARNING "md: bitmaps only supported for raid1\n"); 1042 return -EINVAL; 1043 } 1044 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); 1045 } 1046 } else if (mddev->pers == NULL) { 1047 /* Insist of good event counter while assembling */ 1048 __u64 ev1 = le64_to_cpu(sb->events); 1049 ++ev1; 1050 if (ev1 < mddev->events) 1051 return -EINVAL; 1052 } else if (mddev->bitmap) { 1053 /* If adding to array with a bitmap, then we can accept an 1054 * older device, but not too old. 1055 */ 1056 __u64 ev1 = le64_to_cpu(sb->events); 1057 if (ev1 < mddev->bitmap->events_cleared) 1058 return 0; 1059 } else /* just a hot-add of a new device, leave raid_disk at -1 */ 1060 return 0; 1061 1062 if (mddev->level != LEVEL_MULTIPATH) { 1063 int role; 1064 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1065 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1066 switch(role) { 1067 case 0xffff: /* spare */ 1068 break; 1069 case 0xfffe: /* faulty */ 1070 set_bit(Faulty, &rdev->flags); 1071 break; 1072 default: 1073 set_bit(In_sync, &rdev->flags); 1074 rdev->raid_disk = role; 1075 break; 1076 } 1077 if (sb->devflags & WriteMostly1) 1078 set_bit(WriteMostly, &rdev->flags); 1079 } else /* MULTIPATH are always insync */ 1080 set_bit(In_sync, &rdev->flags); 1081 1082 return 0; 1083 } 1084 1085 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) 1086 { 1087 struct mdp_superblock_1 *sb; 1088 struct list_head *tmp; 1089 mdk_rdev_t *rdev2; 1090 int max_dev, i; 1091 /* make rdev->sb match mddev and rdev data. */ 1092 1093 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1094 1095 sb->feature_map = 0; 1096 sb->pad0 = 0; 1097 memset(sb->pad1, 0, sizeof(sb->pad1)); 1098 memset(sb->pad2, 0, sizeof(sb->pad2)); 1099 memset(sb->pad3, 0, sizeof(sb->pad3)); 1100 1101 sb->utime = cpu_to_le64((__u64)mddev->utime); 1102 sb->events = cpu_to_le64(mddev->events); 1103 if (mddev->in_sync) 1104 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1105 else 1106 sb->resync_offset = cpu_to_le64(0); 1107 1108 if (mddev->bitmap && mddev->bitmap_file == NULL) { 1109 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); 1110 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1111 } 1112 1113 max_dev = 0; 1114 ITERATE_RDEV(mddev,rdev2,tmp) 1115 if (rdev2->desc_nr+1 > max_dev) 1116 max_dev = rdev2->desc_nr+1; 1117 1118 sb->max_dev = cpu_to_le32(max_dev); 1119 for (i=0; i<max_dev;i++) 1120 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1121 1122 ITERATE_RDEV(mddev,rdev2,tmp) { 1123 i = rdev2->desc_nr; 1124 if (test_bit(Faulty, &rdev2->flags)) 1125 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1126 else if (test_bit(In_sync, &rdev2->flags)) 1127 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1128 else 1129 sb->dev_roles[i] = cpu_to_le16(0xffff); 1130 } 1131 1132 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ 1133 sb->sb_csum = calc_sb_1_csum(sb); 1134 } 1135 1136 1137 static struct super_type super_types[] = { 1138 [0] = { 1139 .name = "0.90.0", 1140 .owner = THIS_MODULE, 1141 .load_super = super_90_load, 1142 .validate_super = super_90_validate, 1143 .sync_super = super_90_sync, 1144 }, 1145 [1] = { 1146 .name = "md-1", 1147 .owner = THIS_MODULE, 1148 .load_super = super_1_load, 1149 .validate_super = super_1_validate, 1150 .sync_super = super_1_sync, 1151 }, 1152 }; 1153 1154 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) 1155 { 1156 struct list_head *tmp; 1157 mdk_rdev_t *rdev; 1158 1159 ITERATE_RDEV(mddev,rdev,tmp) 1160 if (rdev->bdev->bd_contains == dev->bdev->bd_contains) 1161 return rdev; 1162 1163 return NULL; 1164 } 1165 1166 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) 1167 { 1168 struct list_head *tmp; 1169 mdk_rdev_t *rdev; 1170 1171 ITERATE_RDEV(mddev1,rdev,tmp) 1172 if (match_dev_unit(mddev2, rdev)) 1173 return 1; 1174 1175 return 0; 1176 } 1177 1178 static LIST_HEAD(pending_raid_disks); 1179 1180 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) 1181 { 1182 mdk_rdev_t *same_pdev; 1183 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1184 struct kobject *ko; 1185 1186 if (rdev->mddev) { 1187 MD_BUG(); 1188 return -EINVAL; 1189 } 1190 same_pdev = match_dev_unit(mddev, rdev); 1191 if (same_pdev) 1192 printk(KERN_WARNING 1193 "%s: WARNING: %s appears to be on the same physical" 1194 " disk as %s. True\n protection against single-disk" 1195 " failure might be compromised.\n", 1196 mdname(mddev), bdevname(rdev->bdev,b), 1197 bdevname(same_pdev->bdev,b2)); 1198 1199 /* Verify rdev->desc_nr is unique. 1200 * If it is -1, assign a free number, else 1201 * check number is not in use 1202 */ 1203 if (rdev->desc_nr < 0) { 1204 int choice = 0; 1205 if (mddev->pers) choice = mddev->raid_disks; 1206 while (find_rdev_nr(mddev, choice)) 1207 choice++; 1208 rdev->desc_nr = choice; 1209 } else { 1210 if (find_rdev_nr(mddev, rdev->desc_nr)) 1211 return -EBUSY; 1212 } 1213 bdevname(rdev->bdev,b); 1214 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) 1215 return -ENOMEM; 1216 1217 list_add(&rdev->same_set, &mddev->disks); 1218 rdev->mddev = mddev; 1219 printk(KERN_INFO "md: bind<%s>\n", b); 1220 1221 rdev->kobj.parent = &mddev->kobj; 1222 kobject_add(&rdev->kobj); 1223 1224 if (rdev->bdev->bd_part) 1225 ko = &rdev->bdev->bd_part->kobj; 1226 else 1227 ko = &rdev->bdev->bd_disk->kobj; 1228 sysfs_create_link(&rdev->kobj, ko, "block"); 1229 return 0; 1230 } 1231 1232 static void unbind_rdev_from_array(mdk_rdev_t * rdev) 1233 { 1234 char b[BDEVNAME_SIZE]; 1235 if (!rdev->mddev) { 1236 MD_BUG(); 1237 return; 1238 } 1239 list_del_init(&rdev->same_set); 1240 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); 1241 rdev->mddev = NULL; 1242 sysfs_remove_link(&rdev->kobj, "block"); 1243 kobject_del(&rdev->kobj); 1244 } 1245 1246 /* 1247 * prevent the device from being mounted, repartitioned or 1248 * otherwise reused by a RAID array (or any other kernel 1249 * subsystem), by bd_claiming the device. 1250 */ 1251 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) 1252 { 1253 int err = 0; 1254 struct block_device *bdev; 1255 char b[BDEVNAME_SIZE]; 1256 1257 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 1258 if (IS_ERR(bdev)) { 1259 printk(KERN_ERR "md: could not open %s.\n", 1260 __bdevname(dev, b)); 1261 return PTR_ERR(bdev); 1262 } 1263 err = bd_claim(bdev, rdev); 1264 if (err) { 1265 printk(KERN_ERR "md: could not bd_claim %s.\n", 1266 bdevname(bdev, b)); 1267 blkdev_put(bdev); 1268 return err; 1269 } 1270 rdev->bdev = bdev; 1271 return err; 1272 } 1273 1274 static void unlock_rdev(mdk_rdev_t *rdev) 1275 { 1276 struct block_device *bdev = rdev->bdev; 1277 rdev->bdev = NULL; 1278 if (!bdev) 1279 MD_BUG(); 1280 bd_release(bdev); 1281 blkdev_put(bdev); 1282 } 1283 1284 void md_autodetect_dev(dev_t dev); 1285 1286 static void export_rdev(mdk_rdev_t * rdev) 1287 { 1288 char b[BDEVNAME_SIZE]; 1289 printk(KERN_INFO "md: export_rdev(%s)\n", 1290 bdevname(rdev->bdev,b)); 1291 if (rdev->mddev) 1292 MD_BUG(); 1293 free_disk_sb(rdev); 1294 list_del_init(&rdev->same_set); 1295 #ifndef MODULE 1296 md_autodetect_dev(rdev->bdev->bd_dev); 1297 #endif 1298 unlock_rdev(rdev); 1299 kobject_put(&rdev->kobj); 1300 } 1301 1302 static void kick_rdev_from_array(mdk_rdev_t * rdev) 1303 { 1304 unbind_rdev_from_array(rdev); 1305 export_rdev(rdev); 1306 } 1307 1308 static void export_array(mddev_t *mddev) 1309 { 1310 struct list_head *tmp; 1311 mdk_rdev_t *rdev; 1312 1313 ITERATE_RDEV(mddev,rdev,tmp) { 1314 if (!rdev->mddev) { 1315 MD_BUG(); 1316 continue; 1317 } 1318 kick_rdev_from_array(rdev); 1319 } 1320 if (!list_empty(&mddev->disks)) 1321 MD_BUG(); 1322 mddev->raid_disks = 0; 1323 mddev->major_version = 0; 1324 } 1325 1326 static void print_desc(mdp_disk_t *desc) 1327 { 1328 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, 1329 desc->major,desc->minor,desc->raid_disk,desc->state); 1330 } 1331 1332 static void print_sb(mdp_super_t *sb) 1333 { 1334 int i; 1335 1336 printk(KERN_INFO 1337 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", 1338 sb->major_version, sb->minor_version, sb->patch_version, 1339 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, 1340 sb->ctime); 1341 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", 1342 sb->level, sb->size, sb->nr_disks, sb->raid_disks, 1343 sb->md_minor, sb->layout, sb->chunk_size); 1344 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" 1345 " FD:%d SD:%d CSUM:%08x E:%08lx\n", 1346 sb->utime, sb->state, sb->active_disks, sb->working_disks, 1347 sb->failed_disks, sb->spare_disks, 1348 sb->sb_csum, (unsigned long)sb->events_lo); 1349 1350 printk(KERN_INFO); 1351 for (i = 0; i < MD_SB_DISKS; i++) { 1352 mdp_disk_t *desc; 1353 1354 desc = sb->disks + i; 1355 if (desc->number || desc->major || desc->minor || 1356 desc->raid_disk || (desc->state && (desc->state != 4))) { 1357 printk(" D %2d: ", i); 1358 print_desc(desc); 1359 } 1360 } 1361 printk(KERN_INFO "md: THIS: "); 1362 print_desc(&sb->this_disk); 1363 1364 } 1365 1366 static void print_rdev(mdk_rdev_t *rdev) 1367 { 1368 char b[BDEVNAME_SIZE]; 1369 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", 1370 bdevname(rdev->bdev,b), (unsigned long long)rdev->size, 1371 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), 1372 rdev->desc_nr); 1373 if (rdev->sb_loaded) { 1374 printk(KERN_INFO "md: rdev superblock:\n"); 1375 print_sb((mdp_super_t*)page_address(rdev->sb_page)); 1376 } else 1377 printk(KERN_INFO "md: no rdev superblock!\n"); 1378 } 1379 1380 void md_print_devices(void) 1381 { 1382 struct list_head *tmp, *tmp2; 1383 mdk_rdev_t *rdev; 1384 mddev_t *mddev; 1385 char b[BDEVNAME_SIZE]; 1386 1387 printk("\n"); 1388 printk("md: **********************************\n"); 1389 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); 1390 printk("md: **********************************\n"); 1391 ITERATE_MDDEV(mddev,tmp) { 1392 1393 if (mddev->bitmap) 1394 bitmap_print_sb(mddev->bitmap); 1395 else 1396 printk("%s: ", mdname(mddev)); 1397 ITERATE_RDEV(mddev,rdev,tmp2) 1398 printk("<%s>", bdevname(rdev->bdev,b)); 1399 printk("\n"); 1400 1401 ITERATE_RDEV(mddev,rdev,tmp2) 1402 print_rdev(rdev); 1403 } 1404 printk("md: **********************************\n"); 1405 printk("\n"); 1406 } 1407 1408 1409 static void sync_sbs(mddev_t * mddev) 1410 { 1411 mdk_rdev_t *rdev; 1412 struct list_head *tmp; 1413 1414 ITERATE_RDEV(mddev,rdev,tmp) { 1415 super_types[mddev->major_version]. 1416 sync_super(mddev, rdev); 1417 rdev->sb_loaded = 1; 1418 } 1419 } 1420 1421 static void md_update_sb(mddev_t * mddev) 1422 { 1423 int err; 1424 struct list_head *tmp; 1425 mdk_rdev_t *rdev; 1426 int sync_req; 1427 1428 repeat: 1429 spin_lock_irq(&mddev->write_lock); 1430 sync_req = mddev->in_sync; 1431 mddev->utime = get_seconds(); 1432 mddev->events ++; 1433 1434 if (!mddev->events) { 1435 /* 1436 * oops, this 64-bit counter should never wrap. 1437 * Either we are in around ~1 trillion A.C., assuming 1438 * 1 reboot per second, or we have a bug: 1439 */ 1440 MD_BUG(); 1441 mddev->events --; 1442 } 1443 mddev->sb_dirty = 2; 1444 sync_sbs(mddev); 1445 1446 /* 1447 * do not write anything to disk if using 1448 * nonpersistent superblocks 1449 */ 1450 if (!mddev->persistent) { 1451 mddev->sb_dirty = 0; 1452 spin_unlock_irq(&mddev->write_lock); 1453 wake_up(&mddev->sb_wait); 1454 return; 1455 } 1456 spin_unlock_irq(&mddev->write_lock); 1457 1458 dprintk(KERN_INFO 1459 "md: updating %s RAID superblock on device (in sync %d)\n", 1460 mdname(mddev),mddev->in_sync); 1461 1462 err = bitmap_update_sb(mddev->bitmap); 1463 ITERATE_RDEV(mddev,rdev,tmp) { 1464 char b[BDEVNAME_SIZE]; 1465 dprintk(KERN_INFO "md: "); 1466 if (test_bit(Faulty, &rdev->flags)) 1467 dprintk("(skipping faulty "); 1468 1469 dprintk("%s ", bdevname(rdev->bdev,b)); 1470 if (!test_bit(Faulty, &rdev->flags)) { 1471 md_super_write(mddev,rdev, 1472 rdev->sb_offset<<1, rdev->sb_size, 1473 rdev->sb_page); 1474 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", 1475 bdevname(rdev->bdev,b), 1476 (unsigned long long)rdev->sb_offset); 1477 1478 } else 1479 dprintk(")\n"); 1480 if (mddev->level == LEVEL_MULTIPATH) 1481 /* only need to write one superblock... */ 1482 break; 1483 } 1484 md_super_wait(mddev); 1485 /* if there was a failure, sb_dirty was set to 1, and we re-write super */ 1486 1487 spin_lock_irq(&mddev->write_lock); 1488 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { 1489 /* have to write it out again */ 1490 spin_unlock_irq(&mddev->write_lock); 1491 goto repeat; 1492 } 1493 mddev->sb_dirty = 0; 1494 spin_unlock_irq(&mddev->write_lock); 1495 wake_up(&mddev->sb_wait); 1496 1497 } 1498 1499 struct rdev_sysfs_entry { 1500 struct attribute attr; 1501 ssize_t (*show)(mdk_rdev_t *, char *); 1502 ssize_t (*store)(mdk_rdev_t *, const char *, size_t); 1503 }; 1504 1505 static ssize_t 1506 state_show(mdk_rdev_t *rdev, char *page) 1507 { 1508 char *sep = ""; 1509 int len=0; 1510 1511 if (test_bit(Faulty, &rdev->flags)) { 1512 len+= sprintf(page+len, "%sfaulty",sep); 1513 sep = ","; 1514 } 1515 if (test_bit(In_sync, &rdev->flags)) { 1516 len += sprintf(page+len, "%sin_sync",sep); 1517 sep = ","; 1518 } 1519 if (!test_bit(Faulty, &rdev->flags) && 1520 !test_bit(In_sync, &rdev->flags)) { 1521 len += sprintf(page+len, "%sspare", sep); 1522 sep = ","; 1523 } 1524 return len+sprintf(page+len, "\n"); 1525 } 1526 1527 static struct rdev_sysfs_entry 1528 rdev_state = __ATTR_RO(state); 1529 1530 static ssize_t 1531 super_show(mdk_rdev_t *rdev, char *page) 1532 { 1533 if (rdev->sb_loaded && rdev->sb_size) { 1534 memcpy(page, page_address(rdev->sb_page), rdev->sb_size); 1535 return rdev->sb_size; 1536 } else 1537 return 0; 1538 } 1539 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); 1540 1541 static struct attribute *rdev_default_attrs[] = { 1542 &rdev_state.attr, 1543 &rdev_super.attr, 1544 NULL, 1545 }; 1546 static ssize_t 1547 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 1548 { 1549 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 1550 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 1551 1552 if (!entry->show) 1553 return -EIO; 1554 return entry->show(rdev, page); 1555 } 1556 1557 static ssize_t 1558 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 1559 const char *page, size_t length) 1560 { 1561 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 1562 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 1563 1564 if (!entry->store) 1565 return -EIO; 1566 return entry->store(rdev, page, length); 1567 } 1568 1569 static void rdev_free(struct kobject *ko) 1570 { 1571 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); 1572 kfree(rdev); 1573 } 1574 static struct sysfs_ops rdev_sysfs_ops = { 1575 .show = rdev_attr_show, 1576 .store = rdev_attr_store, 1577 }; 1578 static struct kobj_type rdev_ktype = { 1579 .release = rdev_free, 1580 .sysfs_ops = &rdev_sysfs_ops, 1581 .default_attrs = rdev_default_attrs, 1582 }; 1583 1584 /* 1585 * Import a device. If 'super_format' >= 0, then sanity check the superblock 1586 * 1587 * mark the device faulty if: 1588 * 1589 * - the device is nonexistent (zero size) 1590 * - the device has no valid superblock 1591 * 1592 * a faulty rdev _never_ has rdev->sb set. 1593 */ 1594 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) 1595 { 1596 char b[BDEVNAME_SIZE]; 1597 int err; 1598 mdk_rdev_t *rdev; 1599 sector_t size; 1600 1601 rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL); 1602 if (!rdev) { 1603 printk(KERN_ERR "md: could not alloc mem for new device!\n"); 1604 return ERR_PTR(-ENOMEM); 1605 } 1606 memset(rdev, 0, sizeof(*rdev)); 1607 1608 if ((err = alloc_disk_sb(rdev))) 1609 goto abort_free; 1610 1611 err = lock_rdev(rdev, newdev); 1612 if (err) 1613 goto abort_free; 1614 1615 rdev->kobj.parent = NULL; 1616 rdev->kobj.ktype = &rdev_ktype; 1617 kobject_init(&rdev->kobj); 1618 1619 rdev->desc_nr = -1; 1620 rdev->flags = 0; 1621 rdev->data_offset = 0; 1622 atomic_set(&rdev->nr_pending, 0); 1623 atomic_set(&rdev->read_errors, 0); 1624 1625 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 1626 if (!size) { 1627 printk(KERN_WARNING 1628 "md: %s has zero or unknown size, marking faulty!\n", 1629 bdevname(rdev->bdev,b)); 1630 err = -EINVAL; 1631 goto abort_free; 1632 } 1633 1634 if (super_format >= 0) { 1635 err = super_types[super_format]. 1636 load_super(rdev, NULL, super_minor); 1637 if (err == -EINVAL) { 1638 printk(KERN_WARNING 1639 "md: %s has invalid sb, not importing!\n", 1640 bdevname(rdev->bdev,b)); 1641 goto abort_free; 1642 } 1643 if (err < 0) { 1644 printk(KERN_WARNING 1645 "md: could not read %s's sb, not importing!\n", 1646 bdevname(rdev->bdev,b)); 1647 goto abort_free; 1648 } 1649 } 1650 INIT_LIST_HEAD(&rdev->same_set); 1651 1652 return rdev; 1653 1654 abort_free: 1655 if (rdev->sb_page) { 1656 if (rdev->bdev) 1657 unlock_rdev(rdev); 1658 free_disk_sb(rdev); 1659 } 1660 kfree(rdev); 1661 return ERR_PTR(err); 1662 } 1663 1664 /* 1665 * Check a full RAID array for plausibility 1666 */ 1667 1668 1669 static void analyze_sbs(mddev_t * mddev) 1670 { 1671 int i; 1672 struct list_head *tmp; 1673 mdk_rdev_t *rdev, *freshest; 1674 char b[BDEVNAME_SIZE]; 1675 1676 freshest = NULL; 1677 ITERATE_RDEV(mddev,rdev,tmp) 1678 switch (super_types[mddev->major_version]. 1679 load_super(rdev, freshest, mddev->minor_version)) { 1680 case 1: 1681 freshest = rdev; 1682 break; 1683 case 0: 1684 break; 1685 default: 1686 printk( KERN_ERR \ 1687 "md: fatal superblock inconsistency in %s" 1688 " -- removing from array\n", 1689 bdevname(rdev->bdev,b)); 1690 kick_rdev_from_array(rdev); 1691 } 1692 1693 1694 super_types[mddev->major_version]. 1695 validate_super(mddev, freshest); 1696 1697 i = 0; 1698 ITERATE_RDEV(mddev,rdev,tmp) { 1699 if (rdev != freshest) 1700 if (super_types[mddev->major_version]. 1701 validate_super(mddev, rdev)) { 1702 printk(KERN_WARNING "md: kicking non-fresh %s" 1703 " from array!\n", 1704 bdevname(rdev->bdev,b)); 1705 kick_rdev_from_array(rdev); 1706 continue; 1707 } 1708 if (mddev->level == LEVEL_MULTIPATH) { 1709 rdev->desc_nr = i++; 1710 rdev->raid_disk = rdev->desc_nr; 1711 set_bit(In_sync, &rdev->flags); 1712 } 1713 } 1714 1715 1716 1717 if (mddev->recovery_cp != MaxSector && 1718 mddev->level >= 1) 1719 printk(KERN_ERR "md: %s: raid array is not clean" 1720 " -- starting background reconstruction\n", 1721 mdname(mddev)); 1722 1723 } 1724 1725 static ssize_t 1726 level_show(mddev_t *mddev, char *page) 1727 { 1728 mdk_personality_t *p = mddev->pers; 1729 if (p == NULL && mddev->raid_disks == 0) 1730 return 0; 1731 if (mddev->level >= 0) 1732 return sprintf(page, "RAID-%d\n", mddev->level); 1733 else 1734 return sprintf(page, "%s\n", p->name); 1735 } 1736 1737 static struct md_sysfs_entry md_level = __ATTR_RO(level); 1738 1739 static ssize_t 1740 raid_disks_show(mddev_t *mddev, char *page) 1741 { 1742 if (mddev->raid_disks == 0) 1743 return 0; 1744 return sprintf(page, "%d\n", mddev->raid_disks); 1745 } 1746 1747 static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks); 1748 1749 static ssize_t 1750 action_show(mddev_t *mddev, char *page) 1751 { 1752 char *type = "idle"; 1753 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 1754 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { 1755 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 1756 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 1757 type = "resync"; 1758 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 1759 type = "check"; 1760 else 1761 type = "repair"; 1762 } else 1763 type = "recover"; 1764 } 1765 return sprintf(page, "%s\n", type); 1766 } 1767 1768 static ssize_t 1769 action_store(mddev_t *mddev, const char *page, size_t len) 1770 { 1771 if (!mddev->pers || !mddev->pers->sync_request) 1772 return -EINVAL; 1773 1774 if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) { 1775 if (mddev->sync_thread) { 1776 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1777 md_unregister_thread(mddev->sync_thread); 1778 mddev->sync_thread = NULL; 1779 mddev->recovery = 0; 1780 } 1781 return len; 1782 } 1783 1784 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 1785 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 1786 return -EBUSY; 1787 if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 || 1788 strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0) 1789 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 1790 else { 1791 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0) 1792 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 1793 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0) 1794 return -EINVAL; 1795 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 1796 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 1797 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 1798 } 1799 md_wakeup_thread(mddev->thread); 1800 return len; 1801 } 1802 1803 static ssize_t 1804 mismatch_cnt_show(mddev_t *mddev, char *page) 1805 { 1806 return sprintf(page, "%llu\n", 1807 (unsigned long long) mddev->resync_mismatches); 1808 } 1809 1810 static struct md_sysfs_entry 1811 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 1812 1813 1814 static struct md_sysfs_entry 1815 md_mismatches = __ATTR_RO(mismatch_cnt); 1816 1817 static struct attribute *md_default_attrs[] = { 1818 &md_level.attr, 1819 &md_raid_disks.attr, 1820 NULL, 1821 }; 1822 1823 static struct attribute *md_redundancy_attrs[] = { 1824 &md_scan_mode.attr, 1825 &md_mismatches.attr, 1826 NULL, 1827 }; 1828 static struct attribute_group md_redundancy_group = { 1829 .name = NULL, 1830 .attrs = md_redundancy_attrs, 1831 }; 1832 1833 1834 static ssize_t 1835 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 1836 { 1837 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 1838 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 1839 ssize_t rv; 1840 1841 if (!entry->show) 1842 return -EIO; 1843 mddev_lock(mddev); 1844 rv = entry->show(mddev, page); 1845 mddev_unlock(mddev); 1846 return rv; 1847 } 1848 1849 static ssize_t 1850 md_attr_store(struct kobject *kobj, struct attribute *attr, 1851 const char *page, size_t length) 1852 { 1853 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 1854 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 1855 ssize_t rv; 1856 1857 if (!entry->store) 1858 return -EIO; 1859 mddev_lock(mddev); 1860 rv = entry->store(mddev, page, length); 1861 mddev_unlock(mddev); 1862 return rv; 1863 } 1864 1865 static void md_free(struct kobject *ko) 1866 { 1867 mddev_t *mddev = container_of(ko, mddev_t, kobj); 1868 kfree(mddev); 1869 } 1870 1871 static struct sysfs_ops md_sysfs_ops = { 1872 .show = md_attr_show, 1873 .store = md_attr_store, 1874 }; 1875 static struct kobj_type md_ktype = { 1876 .release = md_free, 1877 .sysfs_ops = &md_sysfs_ops, 1878 .default_attrs = md_default_attrs, 1879 }; 1880 1881 int mdp_major = 0; 1882 1883 static struct kobject *md_probe(dev_t dev, int *part, void *data) 1884 { 1885 static DECLARE_MUTEX(disks_sem); 1886 mddev_t *mddev = mddev_find(dev); 1887 struct gendisk *disk; 1888 int partitioned = (MAJOR(dev) != MD_MAJOR); 1889 int shift = partitioned ? MdpMinorShift : 0; 1890 int unit = MINOR(dev) >> shift; 1891 1892 if (!mddev) 1893 return NULL; 1894 1895 down(&disks_sem); 1896 if (mddev->gendisk) { 1897 up(&disks_sem); 1898 mddev_put(mddev); 1899 return NULL; 1900 } 1901 disk = alloc_disk(1 << shift); 1902 if (!disk) { 1903 up(&disks_sem); 1904 mddev_put(mddev); 1905 return NULL; 1906 } 1907 disk->major = MAJOR(dev); 1908 disk->first_minor = unit << shift; 1909 if (partitioned) { 1910 sprintf(disk->disk_name, "md_d%d", unit); 1911 sprintf(disk->devfs_name, "md/d%d", unit); 1912 } else { 1913 sprintf(disk->disk_name, "md%d", unit); 1914 sprintf(disk->devfs_name, "md/%d", unit); 1915 } 1916 disk->fops = &md_fops; 1917 disk->private_data = mddev; 1918 disk->queue = mddev->queue; 1919 add_disk(disk); 1920 mddev->gendisk = disk; 1921 up(&disks_sem); 1922 mddev->kobj.parent = &disk->kobj; 1923 mddev->kobj.k_name = NULL; 1924 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); 1925 mddev->kobj.ktype = &md_ktype; 1926 kobject_register(&mddev->kobj); 1927 return NULL; 1928 } 1929 1930 void md_wakeup_thread(mdk_thread_t *thread); 1931 1932 static void md_safemode_timeout(unsigned long data) 1933 { 1934 mddev_t *mddev = (mddev_t *) data; 1935 1936 mddev->safemode = 1; 1937 md_wakeup_thread(mddev->thread); 1938 } 1939 1940 1941 static int do_md_run(mddev_t * mddev) 1942 { 1943 int pnum, err; 1944 int chunk_size; 1945 struct list_head *tmp; 1946 mdk_rdev_t *rdev; 1947 struct gendisk *disk; 1948 char b[BDEVNAME_SIZE]; 1949 1950 if (list_empty(&mddev->disks)) 1951 /* cannot run an array with no devices.. */ 1952 return -EINVAL; 1953 1954 if (mddev->pers) 1955 return -EBUSY; 1956 1957 /* 1958 * Analyze all RAID superblock(s) 1959 */ 1960 if (!mddev->raid_disks) 1961 analyze_sbs(mddev); 1962 1963 chunk_size = mddev->chunk_size; 1964 pnum = level_to_pers(mddev->level); 1965 1966 if ((pnum != MULTIPATH) && (pnum != RAID1)) { 1967 if (!chunk_size) { 1968 /* 1969 * 'default chunksize' in the old md code used to 1970 * be PAGE_SIZE, baaad. 1971 * we abort here to be on the safe side. We don't 1972 * want to continue the bad practice. 1973 */ 1974 printk(KERN_ERR 1975 "no chunksize specified, see 'man raidtab'\n"); 1976 return -EINVAL; 1977 } 1978 if (chunk_size > MAX_CHUNK_SIZE) { 1979 printk(KERN_ERR "too big chunk_size: %d > %d\n", 1980 chunk_size, MAX_CHUNK_SIZE); 1981 return -EINVAL; 1982 } 1983 /* 1984 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE 1985 */ 1986 if ( (1 << ffz(~chunk_size)) != chunk_size) { 1987 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); 1988 return -EINVAL; 1989 } 1990 if (chunk_size < PAGE_SIZE) { 1991 printk(KERN_ERR "too small chunk_size: %d < %ld\n", 1992 chunk_size, PAGE_SIZE); 1993 return -EINVAL; 1994 } 1995 1996 /* devices must have minimum size of one chunk */ 1997 ITERATE_RDEV(mddev,rdev,tmp) { 1998 if (test_bit(Faulty, &rdev->flags)) 1999 continue; 2000 if (rdev->size < chunk_size / 1024) { 2001 printk(KERN_WARNING 2002 "md: Dev %s smaller than chunk_size:" 2003 " %lluk < %dk\n", 2004 bdevname(rdev->bdev,b), 2005 (unsigned long long)rdev->size, 2006 chunk_size / 1024); 2007 return -EINVAL; 2008 } 2009 } 2010 } 2011 2012 #ifdef CONFIG_KMOD 2013 if (!pers[pnum]) 2014 { 2015 request_module("md-personality-%d", pnum); 2016 } 2017 #endif 2018 2019 /* 2020 * Drop all container device buffers, from now on 2021 * the only valid external interface is through the md 2022 * device. 2023 * Also find largest hardsector size 2024 */ 2025 ITERATE_RDEV(mddev,rdev,tmp) { 2026 if (test_bit(Faulty, &rdev->flags)) 2027 continue; 2028 sync_blockdev(rdev->bdev); 2029 invalidate_bdev(rdev->bdev, 0); 2030 } 2031 2032 md_probe(mddev->unit, NULL, NULL); 2033 disk = mddev->gendisk; 2034 if (!disk) 2035 return -ENOMEM; 2036 2037 spin_lock(&pers_lock); 2038 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) { 2039 spin_unlock(&pers_lock); 2040 printk(KERN_WARNING "md: personality %d is not loaded!\n", 2041 pnum); 2042 return -EINVAL; 2043 } 2044 2045 mddev->pers = pers[pnum]; 2046 spin_unlock(&pers_lock); 2047 2048 mddev->recovery = 0; 2049 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ 2050 mddev->barriers_work = 1; 2051 2052 if (start_readonly) 2053 mddev->ro = 2; /* read-only, but switch on first write */ 2054 2055 /* before we start the array running, initialise the bitmap */ 2056 err = bitmap_create(mddev); 2057 if (err) 2058 printk(KERN_ERR "%s: failed to create bitmap (%d)\n", 2059 mdname(mddev), err); 2060 else 2061 err = mddev->pers->run(mddev); 2062 if (err) { 2063 printk(KERN_ERR "md: pers->run() failed ...\n"); 2064 module_put(mddev->pers->owner); 2065 mddev->pers = NULL; 2066 bitmap_destroy(mddev); 2067 return err; 2068 } 2069 if (mddev->pers->sync_request) 2070 sysfs_create_group(&mddev->kobj, &md_redundancy_group); 2071 else if (mddev->ro == 2) /* auto-readonly not meaningful */ 2072 mddev->ro = 0; 2073 2074 atomic_set(&mddev->writes_pending,0); 2075 mddev->safemode = 0; 2076 mddev->safemode_timer.function = md_safemode_timeout; 2077 mddev->safemode_timer.data = (unsigned long) mddev; 2078 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ 2079 mddev->in_sync = 1; 2080 2081 ITERATE_RDEV(mddev,rdev,tmp) 2082 if (rdev->raid_disk >= 0) { 2083 char nm[20]; 2084 sprintf(nm, "rd%d", rdev->raid_disk); 2085 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 2086 } 2087 2088 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2089 md_wakeup_thread(mddev->thread); 2090 2091 if (mddev->sb_dirty) 2092 md_update_sb(mddev); 2093 2094 set_capacity(disk, mddev->array_size<<1); 2095 2096 /* If we call blk_queue_make_request here, it will 2097 * re-initialise max_sectors etc which may have been 2098 * refined inside -> run. So just set the bits we need to set. 2099 * Most initialisation happended when we called 2100 * blk_queue_make_request(..., md_fail_request) 2101 * earlier. 2102 */ 2103 mddev->queue->queuedata = mddev; 2104 mddev->queue->make_request_fn = mddev->pers->make_request; 2105 2106 mddev->changed = 1; 2107 return 0; 2108 } 2109 2110 static int restart_array(mddev_t *mddev) 2111 { 2112 struct gendisk *disk = mddev->gendisk; 2113 int err; 2114 2115 /* 2116 * Complain if it has no devices 2117 */ 2118 err = -ENXIO; 2119 if (list_empty(&mddev->disks)) 2120 goto out; 2121 2122 if (mddev->pers) { 2123 err = -EBUSY; 2124 if (!mddev->ro) 2125 goto out; 2126 2127 mddev->safemode = 0; 2128 mddev->ro = 0; 2129 set_disk_ro(disk, 0); 2130 2131 printk(KERN_INFO "md: %s switched to read-write mode.\n", 2132 mdname(mddev)); 2133 /* 2134 * Kick recovery or resync if necessary 2135 */ 2136 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2137 md_wakeup_thread(mddev->thread); 2138 err = 0; 2139 } else { 2140 printk(KERN_ERR "md: %s has no personality assigned.\n", 2141 mdname(mddev)); 2142 err = -EINVAL; 2143 } 2144 2145 out: 2146 return err; 2147 } 2148 2149 static int do_md_stop(mddev_t * mddev, int ro) 2150 { 2151 int err = 0; 2152 struct gendisk *disk = mddev->gendisk; 2153 2154 if (mddev->pers) { 2155 if (atomic_read(&mddev->active)>2) { 2156 printk("md: %s still in use.\n",mdname(mddev)); 2157 return -EBUSY; 2158 } 2159 2160 if (mddev->sync_thread) { 2161 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 2162 md_unregister_thread(mddev->sync_thread); 2163 mddev->sync_thread = NULL; 2164 } 2165 2166 del_timer_sync(&mddev->safemode_timer); 2167 2168 invalidate_partition(disk, 0); 2169 2170 if (ro) { 2171 err = -ENXIO; 2172 if (mddev->ro==1) 2173 goto out; 2174 mddev->ro = 1; 2175 } else { 2176 bitmap_flush(mddev); 2177 md_super_wait(mddev); 2178 if (mddev->ro) 2179 set_disk_ro(disk, 0); 2180 blk_queue_make_request(mddev->queue, md_fail_request); 2181 mddev->pers->stop(mddev); 2182 if (mddev->pers->sync_request) 2183 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 2184 2185 module_put(mddev->pers->owner); 2186 mddev->pers = NULL; 2187 if (mddev->ro) 2188 mddev->ro = 0; 2189 } 2190 if (!mddev->in_sync) { 2191 /* mark array as shutdown cleanly */ 2192 mddev->in_sync = 1; 2193 md_update_sb(mddev); 2194 } 2195 if (ro) 2196 set_disk_ro(disk, 1); 2197 } 2198 2199 bitmap_destroy(mddev); 2200 if (mddev->bitmap_file) { 2201 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); 2202 fput(mddev->bitmap_file); 2203 mddev->bitmap_file = NULL; 2204 } 2205 mddev->bitmap_offset = 0; 2206 2207 /* 2208 * Free resources if final stop 2209 */ 2210 if (!ro) { 2211 mdk_rdev_t *rdev; 2212 struct list_head *tmp; 2213 struct gendisk *disk; 2214 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); 2215 2216 ITERATE_RDEV(mddev,rdev,tmp) 2217 if (rdev->raid_disk >= 0) { 2218 char nm[20]; 2219 sprintf(nm, "rd%d", rdev->raid_disk); 2220 sysfs_remove_link(&mddev->kobj, nm); 2221 } 2222 2223 export_array(mddev); 2224 2225 mddev->array_size = 0; 2226 disk = mddev->gendisk; 2227 if (disk) 2228 set_capacity(disk, 0); 2229 mddev->changed = 1; 2230 } else 2231 printk(KERN_INFO "md: %s switched to read-only mode.\n", 2232 mdname(mddev)); 2233 err = 0; 2234 out: 2235 return err; 2236 } 2237 2238 static void autorun_array(mddev_t *mddev) 2239 { 2240 mdk_rdev_t *rdev; 2241 struct list_head *tmp; 2242 int err; 2243 2244 if (list_empty(&mddev->disks)) 2245 return; 2246 2247 printk(KERN_INFO "md: running: "); 2248 2249 ITERATE_RDEV(mddev,rdev,tmp) { 2250 char b[BDEVNAME_SIZE]; 2251 printk("<%s>", bdevname(rdev->bdev,b)); 2252 } 2253 printk("\n"); 2254 2255 err = do_md_run (mddev); 2256 if (err) { 2257 printk(KERN_WARNING "md: do_md_run() returned %d\n", err); 2258 do_md_stop (mddev, 0); 2259 } 2260 } 2261 2262 /* 2263 * lets try to run arrays based on all disks that have arrived 2264 * until now. (those are in pending_raid_disks) 2265 * 2266 * the method: pick the first pending disk, collect all disks with 2267 * the same UUID, remove all from the pending list and put them into 2268 * the 'same_array' list. Then order this list based on superblock 2269 * update time (freshest comes first), kick out 'old' disks and 2270 * compare superblocks. If everything's fine then run it. 2271 * 2272 * If "unit" is allocated, then bump its reference count 2273 */ 2274 static void autorun_devices(int part) 2275 { 2276 struct list_head candidates; 2277 struct list_head *tmp; 2278 mdk_rdev_t *rdev0, *rdev; 2279 mddev_t *mddev; 2280 char b[BDEVNAME_SIZE]; 2281 2282 printk(KERN_INFO "md: autorun ...\n"); 2283 while (!list_empty(&pending_raid_disks)) { 2284 dev_t dev; 2285 rdev0 = list_entry(pending_raid_disks.next, 2286 mdk_rdev_t, same_set); 2287 2288 printk(KERN_INFO "md: considering %s ...\n", 2289 bdevname(rdev0->bdev,b)); 2290 INIT_LIST_HEAD(&candidates); 2291 ITERATE_RDEV_PENDING(rdev,tmp) 2292 if (super_90_load(rdev, rdev0, 0) >= 0) { 2293 printk(KERN_INFO "md: adding %s ...\n", 2294 bdevname(rdev->bdev,b)); 2295 list_move(&rdev->same_set, &candidates); 2296 } 2297 /* 2298 * now we have a set of devices, with all of them having 2299 * mostly sane superblocks. It's time to allocate the 2300 * mddev. 2301 */ 2302 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { 2303 printk(KERN_INFO "md: unit number in %s is bad: %d\n", 2304 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 2305 break; 2306 } 2307 if (part) 2308 dev = MKDEV(mdp_major, 2309 rdev0->preferred_minor << MdpMinorShift); 2310 else 2311 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 2312 2313 md_probe(dev, NULL, NULL); 2314 mddev = mddev_find(dev); 2315 if (!mddev) { 2316 printk(KERN_ERR 2317 "md: cannot allocate memory for md drive.\n"); 2318 break; 2319 } 2320 if (mddev_lock(mddev)) 2321 printk(KERN_WARNING "md: %s locked, cannot run\n", 2322 mdname(mddev)); 2323 else if (mddev->raid_disks || mddev->major_version 2324 || !list_empty(&mddev->disks)) { 2325 printk(KERN_WARNING 2326 "md: %s already running, cannot run %s\n", 2327 mdname(mddev), bdevname(rdev0->bdev,b)); 2328 mddev_unlock(mddev); 2329 } else { 2330 printk(KERN_INFO "md: created %s\n", mdname(mddev)); 2331 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { 2332 list_del_init(&rdev->same_set); 2333 if (bind_rdev_to_array(rdev, mddev)) 2334 export_rdev(rdev); 2335 } 2336 autorun_array(mddev); 2337 mddev_unlock(mddev); 2338 } 2339 /* on success, candidates will be empty, on error 2340 * it won't... 2341 */ 2342 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) 2343 export_rdev(rdev); 2344 mddev_put(mddev); 2345 } 2346 printk(KERN_INFO "md: ... autorun DONE.\n"); 2347 } 2348 2349 /* 2350 * import RAID devices based on one partition 2351 * if possible, the array gets run as well. 2352 */ 2353 2354 static int autostart_array(dev_t startdev) 2355 { 2356 char b[BDEVNAME_SIZE]; 2357 int err = -EINVAL, i; 2358 mdp_super_t *sb = NULL; 2359 mdk_rdev_t *start_rdev = NULL, *rdev; 2360 2361 start_rdev = md_import_device(startdev, 0, 0); 2362 if (IS_ERR(start_rdev)) 2363 return err; 2364 2365 2366 /* NOTE: this can only work for 0.90.0 superblocks */ 2367 sb = (mdp_super_t*)page_address(start_rdev->sb_page); 2368 if (sb->major_version != 0 || 2369 sb->minor_version != 90 ) { 2370 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); 2371 export_rdev(start_rdev); 2372 return err; 2373 } 2374 2375 if (test_bit(Faulty, &start_rdev->flags)) { 2376 printk(KERN_WARNING 2377 "md: can not autostart based on faulty %s!\n", 2378 bdevname(start_rdev->bdev,b)); 2379 export_rdev(start_rdev); 2380 return err; 2381 } 2382 list_add(&start_rdev->same_set, &pending_raid_disks); 2383 2384 for (i = 0; i < MD_SB_DISKS; i++) { 2385 mdp_disk_t *desc = sb->disks + i; 2386 dev_t dev = MKDEV(desc->major, desc->minor); 2387 2388 if (!dev) 2389 continue; 2390 if (dev == startdev) 2391 continue; 2392 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) 2393 continue; 2394 rdev = md_import_device(dev, 0, 0); 2395 if (IS_ERR(rdev)) 2396 continue; 2397 2398 list_add(&rdev->same_set, &pending_raid_disks); 2399 } 2400 2401 /* 2402 * possibly return codes 2403 */ 2404 autorun_devices(0); 2405 return 0; 2406 2407 } 2408 2409 2410 static int get_version(void __user * arg) 2411 { 2412 mdu_version_t ver; 2413 2414 ver.major = MD_MAJOR_VERSION; 2415 ver.minor = MD_MINOR_VERSION; 2416 ver.patchlevel = MD_PATCHLEVEL_VERSION; 2417 2418 if (copy_to_user(arg, &ver, sizeof(ver))) 2419 return -EFAULT; 2420 2421 return 0; 2422 } 2423 2424 static int get_array_info(mddev_t * mddev, void __user * arg) 2425 { 2426 mdu_array_info_t info; 2427 int nr,working,active,failed,spare; 2428 mdk_rdev_t *rdev; 2429 struct list_head *tmp; 2430 2431 nr=working=active=failed=spare=0; 2432 ITERATE_RDEV(mddev,rdev,tmp) { 2433 nr++; 2434 if (test_bit(Faulty, &rdev->flags)) 2435 failed++; 2436 else { 2437 working++; 2438 if (test_bit(In_sync, &rdev->flags)) 2439 active++; 2440 else 2441 spare++; 2442 } 2443 } 2444 2445 info.major_version = mddev->major_version; 2446 info.minor_version = mddev->minor_version; 2447 info.patch_version = MD_PATCHLEVEL_VERSION; 2448 info.ctime = mddev->ctime; 2449 info.level = mddev->level; 2450 info.size = mddev->size; 2451 info.nr_disks = nr; 2452 info.raid_disks = mddev->raid_disks; 2453 info.md_minor = mddev->md_minor; 2454 info.not_persistent= !mddev->persistent; 2455 2456 info.utime = mddev->utime; 2457 info.state = 0; 2458 if (mddev->in_sync) 2459 info.state = (1<<MD_SB_CLEAN); 2460 if (mddev->bitmap && mddev->bitmap_offset) 2461 info.state = (1<<MD_SB_BITMAP_PRESENT); 2462 info.active_disks = active; 2463 info.working_disks = working; 2464 info.failed_disks = failed; 2465 info.spare_disks = spare; 2466 2467 info.layout = mddev->layout; 2468 info.chunk_size = mddev->chunk_size; 2469 2470 if (copy_to_user(arg, &info, sizeof(info))) 2471 return -EFAULT; 2472 2473 return 0; 2474 } 2475 2476 static int get_bitmap_file(mddev_t * mddev, void __user * arg) 2477 { 2478 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 2479 char *ptr, *buf = NULL; 2480 int err = -ENOMEM; 2481 2482 file = kmalloc(sizeof(*file), GFP_KERNEL); 2483 if (!file) 2484 goto out; 2485 2486 /* bitmap disabled, zero the first byte and copy out */ 2487 if (!mddev->bitmap || !mddev->bitmap->file) { 2488 file->pathname[0] = '\0'; 2489 goto copy_out; 2490 } 2491 2492 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); 2493 if (!buf) 2494 goto out; 2495 2496 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); 2497 if (!ptr) 2498 goto out; 2499 2500 strcpy(file->pathname, ptr); 2501 2502 copy_out: 2503 err = 0; 2504 if (copy_to_user(arg, file, sizeof(*file))) 2505 err = -EFAULT; 2506 out: 2507 kfree(buf); 2508 kfree(file); 2509 return err; 2510 } 2511 2512 static int get_disk_info(mddev_t * mddev, void __user * arg) 2513 { 2514 mdu_disk_info_t info; 2515 unsigned int nr; 2516 mdk_rdev_t *rdev; 2517 2518 if (copy_from_user(&info, arg, sizeof(info))) 2519 return -EFAULT; 2520 2521 nr = info.number; 2522 2523 rdev = find_rdev_nr(mddev, nr); 2524 if (rdev) { 2525 info.major = MAJOR(rdev->bdev->bd_dev); 2526 info.minor = MINOR(rdev->bdev->bd_dev); 2527 info.raid_disk = rdev->raid_disk; 2528 info.state = 0; 2529 if (test_bit(Faulty, &rdev->flags)) 2530 info.state |= (1<<MD_DISK_FAULTY); 2531 else if (test_bit(In_sync, &rdev->flags)) { 2532 info.state |= (1<<MD_DISK_ACTIVE); 2533 info.state |= (1<<MD_DISK_SYNC); 2534 } 2535 if (test_bit(WriteMostly, &rdev->flags)) 2536 info.state |= (1<<MD_DISK_WRITEMOSTLY); 2537 } else { 2538 info.major = info.minor = 0; 2539 info.raid_disk = -1; 2540 info.state = (1<<MD_DISK_REMOVED); 2541 } 2542 2543 if (copy_to_user(arg, &info, sizeof(info))) 2544 return -EFAULT; 2545 2546 return 0; 2547 } 2548 2549 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) 2550 { 2551 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 2552 mdk_rdev_t *rdev; 2553 dev_t dev = MKDEV(info->major,info->minor); 2554 2555 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 2556 return -EOVERFLOW; 2557 2558 if (!mddev->raid_disks) { 2559 int err; 2560 /* expecting a device which has a superblock */ 2561 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 2562 if (IS_ERR(rdev)) { 2563 printk(KERN_WARNING 2564 "md: md_import_device returned %ld\n", 2565 PTR_ERR(rdev)); 2566 return PTR_ERR(rdev); 2567 } 2568 if (!list_empty(&mddev->disks)) { 2569 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, 2570 mdk_rdev_t, same_set); 2571 int err = super_types[mddev->major_version] 2572 .load_super(rdev, rdev0, mddev->minor_version); 2573 if (err < 0) { 2574 printk(KERN_WARNING 2575 "md: %s has different UUID to %s\n", 2576 bdevname(rdev->bdev,b), 2577 bdevname(rdev0->bdev,b2)); 2578 export_rdev(rdev); 2579 return -EINVAL; 2580 } 2581 } 2582 err = bind_rdev_to_array(rdev, mddev); 2583 if (err) 2584 export_rdev(rdev); 2585 return err; 2586 } 2587 2588 /* 2589 * add_new_disk can be used once the array is assembled 2590 * to add "hot spares". They must already have a superblock 2591 * written 2592 */ 2593 if (mddev->pers) { 2594 int err; 2595 if (!mddev->pers->hot_add_disk) { 2596 printk(KERN_WARNING 2597 "%s: personality does not support diskops!\n", 2598 mdname(mddev)); 2599 return -EINVAL; 2600 } 2601 if (mddev->persistent) 2602 rdev = md_import_device(dev, mddev->major_version, 2603 mddev->minor_version); 2604 else 2605 rdev = md_import_device(dev, -1, -1); 2606 if (IS_ERR(rdev)) { 2607 printk(KERN_WARNING 2608 "md: md_import_device returned %ld\n", 2609 PTR_ERR(rdev)); 2610 return PTR_ERR(rdev); 2611 } 2612 /* set save_raid_disk if appropriate */ 2613 if (!mddev->persistent) { 2614 if (info->state & (1<<MD_DISK_SYNC) && 2615 info->raid_disk < mddev->raid_disks) 2616 rdev->raid_disk = info->raid_disk; 2617 else 2618 rdev->raid_disk = -1; 2619 } else 2620 super_types[mddev->major_version]. 2621 validate_super(mddev, rdev); 2622 rdev->saved_raid_disk = rdev->raid_disk; 2623 2624 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 2625 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 2626 set_bit(WriteMostly, &rdev->flags); 2627 2628 rdev->raid_disk = -1; 2629 err = bind_rdev_to_array(rdev, mddev); 2630 if (err) 2631 export_rdev(rdev); 2632 2633 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2634 md_wakeup_thread(mddev->thread); 2635 return err; 2636 } 2637 2638 /* otherwise, add_new_disk is only allowed 2639 * for major_version==0 superblocks 2640 */ 2641 if (mddev->major_version != 0) { 2642 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", 2643 mdname(mddev)); 2644 return -EINVAL; 2645 } 2646 2647 if (!(info->state & (1<<MD_DISK_FAULTY))) { 2648 int err; 2649 rdev = md_import_device (dev, -1, 0); 2650 if (IS_ERR(rdev)) { 2651 printk(KERN_WARNING 2652 "md: error, md_import_device() returned %ld\n", 2653 PTR_ERR(rdev)); 2654 return PTR_ERR(rdev); 2655 } 2656 rdev->desc_nr = info->number; 2657 if (info->raid_disk < mddev->raid_disks) 2658 rdev->raid_disk = info->raid_disk; 2659 else 2660 rdev->raid_disk = -1; 2661 2662 rdev->flags = 0; 2663 2664 if (rdev->raid_disk < mddev->raid_disks) 2665 if (info->state & (1<<MD_DISK_SYNC)) 2666 set_bit(In_sync, &rdev->flags); 2667 2668 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 2669 set_bit(WriteMostly, &rdev->flags); 2670 2671 err = bind_rdev_to_array(rdev, mddev); 2672 if (err) { 2673 export_rdev(rdev); 2674 return err; 2675 } 2676 2677 if (!mddev->persistent) { 2678 printk(KERN_INFO "md: nonpersistent superblock ...\n"); 2679 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2680 } else 2681 rdev->sb_offset = calc_dev_sboffset(rdev->bdev); 2682 rdev->size = calc_dev_size(rdev, mddev->chunk_size); 2683 2684 if (!mddev->size || (mddev->size > rdev->size)) 2685 mddev->size = rdev->size; 2686 } 2687 2688 return 0; 2689 } 2690 2691 static int hot_remove_disk(mddev_t * mddev, dev_t dev) 2692 { 2693 char b[BDEVNAME_SIZE]; 2694 mdk_rdev_t *rdev; 2695 2696 if (!mddev->pers) 2697 return -ENODEV; 2698 2699 rdev = find_rdev(mddev, dev); 2700 if (!rdev) 2701 return -ENXIO; 2702 2703 if (rdev->raid_disk >= 0) 2704 goto busy; 2705 2706 kick_rdev_from_array(rdev); 2707 md_update_sb(mddev); 2708 2709 return 0; 2710 busy: 2711 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", 2712 bdevname(rdev->bdev,b), mdname(mddev)); 2713 return -EBUSY; 2714 } 2715 2716 static int hot_add_disk(mddev_t * mddev, dev_t dev) 2717 { 2718 char b[BDEVNAME_SIZE]; 2719 int err; 2720 unsigned int size; 2721 mdk_rdev_t *rdev; 2722 2723 if (!mddev->pers) 2724 return -ENODEV; 2725 2726 if (mddev->major_version != 0) { 2727 printk(KERN_WARNING "%s: HOT_ADD may only be used with" 2728 " version-0 superblocks.\n", 2729 mdname(mddev)); 2730 return -EINVAL; 2731 } 2732 if (!mddev->pers->hot_add_disk) { 2733 printk(KERN_WARNING 2734 "%s: personality does not support diskops!\n", 2735 mdname(mddev)); 2736 return -EINVAL; 2737 } 2738 2739 rdev = md_import_device (dev, -1, 0); 2740 if (IS_ERR(rdev)) { 2741 printk(KERN_WARNING 2742 "md: error, md_import_device() returned %ld\n", 2743 PTR_ERR(rdev)); 2744 return -EINVAL; 2745 } 2746 2747 if (mddev->persistent) 2748 rdev->sb_offset = calc_dev_sboffset(rdev->bdev); 2749 else 2750 rdev->sb_offset = 2751 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2752 2753 size = calc_dev_size(rdev, mddev->chunk_size); 2754 rdev->size = size; 2755 2756 if (size < mddev->size) { 2757 printk(KERN_WARNING 2758 "%s: disk size %llu blocks < array size %llu\n", 2759 mdname(mddev), (unsigned long long)size, 2760 (unsigned long long)mddev->size); 2761 err = -ENOSPC; 2762 goto abort_export; 2763 } 2764 2765 if (test_bit(Faulty, &rdev->flags)) { 2766 printk(KERN_WARNING 2767 "md: can not hot-add faulty %s disk to %s!\n", 2768 bdevname(rdev->bdev,b), mdname(mddev)); 2769 err = -EINVAL; 2770 goto abort_export; 2771 } 2772 clear_bit(In_sync, &rdev->flags); 2773 rdev->desc_nr = -1; 2774 bind_rdev_to_array(rdev, mddev); 2775 2776 /* 2777 * The rest should better be atomic, we can have disk failures 2778 * noticed in interrupt contexts ... 2779 */ 2780 2781 if (rdev->desc_nr == mddev->max_disks) { 2782 printk(KERN_WARNING "%s: can not hot-add to full array!\n", 2783 mdname(mddev)); 2784 err = -EBUSY; 2785 goto abort_unbind_export; 2786 } 2787 2788 rdev->raid_disk = -1; 2789 2790 md_update_sb(mddev); 2791 2792 /* 2793 * Kick recovery, maybe this spare has to be added to the 2794 * array immediately. 2795 */ 2796 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2797 md_wakeup_thread(mddev->thread); 2798 2799 return 0; 2800 2801 abort_unbind_export: 2802 unbind_rdev_from_array(rdev); 2803 2804 abort_export: 2805 export_rdev(rdev); 2806 return err; 2807 } 2808 2809 /* similar to deny_write_access, but accounts for our holding a reference 2810 * to the file ourselves */ 2811 static int deny_bitmap_write_access(struct file * file) 2812 { 2813 struct inode *inode = file->f_mapping->host; 2814 2815 spin_lock(&inode->i_lock); 2816 if (atomic_read(&inode->i_writecount) > 1) { 2817 spin_unlock(&inode->i_lock); 2818 return -ETXTBSY; 2819 } 2820 atomic_set(&inode->i_writecount, -1); 2821 spin_unlock(&inode->i_lock); 2822 2823 return 0; 2824 } 2825 2826 static int set_bitmap_file(mddev_t *mddev, int fd) 2827 { 2828 int err; 2829 2830 if (mddev->pers) { 2831 if (!mddev->pers->quiesce) 2832 return -EBUSY; 2833 if (mddev->recovery || mddev->sync_thread) 2834 return -EBUSY; 2835 /* we should be able to change the bitmap.. */ 2836 } 2837 2838 2839 if (fd >= 0) { 2840 if (mddev->bitmap) 2841 return -EEXIST; /* cannot add when bitmap is present */ 2842 mddev->bitmap_file = fget(fd); 2843 2844 if (mddev->bitmap_file == NULL) { 2845 printk(KERN_ERR "%s: error: failed to get bitmap file\n", 2846 mdname(mddev)); 2847 return -EBADF; 2848 } 2849 2850 err = deny_bitmap_write_access(mddev->bitmap_file); 2851 if (err) { 2852 printk(KERN_ERR "%s: error: bitmap file is already in use\n", 2853 mdname(mddev)); 2854 fput(mddev->bitmap_file); 2855 mddev->bitmap_file = NULL; 2856 return err; 2857 } 2858 mddev->bitmap_offset = 0; /* file overrides offset */ 2859 } else if (mddev->bitmap == NULL) 2860 return -ENOENT; /* cannot remove what isn't there */ 2861 err = 0; 2862 if (mddev->pers) { 2863 mddev->pers->quiesce(mddev, 1); 2864 if (fd >= 0) 2865 err = bitmap_create(mddev); 2866 if (fd < 0 || err) 2867 bitmap_destroy(mddev); 2868 mddev->pers->quiesce(mddev, 0); 2869 } else if (fd < 0) { 2870 if (mddev->bitmap_file) 2871 fput(mddev->bitmap_file); 2872 mddev->bitmap_file = NULL; 2873 } 2874 2875 return err; 2876 } 2877 2878 /* 2879 * set_array_info is used two different ways 2880 * The original usage is when creating a new array. 2881 * In this usage, raid_disks is > 0 and it together with 2882 * level, size, not_persistent,layout,chunksize determine the 2883 * shape of the array. 2884 * This will always create an array with a type-0.90.0 superblock. 2885 * The newer usage is when assembling an array. 2886 * In this case raid_disks will be 0, and the major_version field is 2887 * use to determine which style super-blocks are to be found on the devices. 2888 * The minor and patch _version numbers are also kept incase the 2889 * super_block handler wishes to interpret them. 2890 */ 2891 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) 2892 { 2893 2894 if (info->raid_disks == 0) { 2895 /* just setting version number for superblock loading */ 2896 if (info->major_version < 0 || 2897 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || 2898 super_types[info->major_version].name == NULL) { 2899 /* maybe try to auto-load a module? */ 2900 printk(KERN_INFO 2901 "md: superblock version %d not known\n", 2902 info->major_version); 2903 return -EINVAL; 2904 } 2905 mddev->major_version = info->major_version; 2906 mddev->minor_version = info->minor_version; 2907 mddev->patch_version = info->patch_version; 2908 return 0; 2909 } 2910 mddev->major_version = MD_MAJOR_VERSION; 2911 mddev->minor_version = MD_MINOR_VERSION; 2912 mddev->patch_version = MD_PATCHLEVEL_VERSION; 2913 mddev->ctime = get_seconds(); 2914 2915 mddev->level = info->level; 2916 mddev->size = info->size; 2917 mddev->raid_disks = info->raid_disks; 2918 /* don't set md_minor, it is determined by which /dev/md* was 2919 * openned 2920 */ 2921 if (info->state & (1<<MD_SB_CLEAN)) 2922 mddev->recovery_cp = MaxSector; 2923 else 2924 mddev->recovery_cp = 0; 2925 mddev->persistent = ! info->not_persistent; 2926 2927 mddev->layout = info->layout; 2928 mddev->chunk_size = info->chunk_size; 2929 2930 mddev->max_disks = MD_SB_DISKS; 2931 2932 mddev->sb_dirty = 1; 2933 2934 mddev->default_bitmap_offset = MD_SB_BYTES >> 9; 2935 mddev->bitmap_offset = 0; 2936 2937 /* 2938 * Generate a 128 bit UUID 2939 */ 2940 get_random_bytes(mddev->uuid, 16); 2941 2942 return 0; 2943 } 2944 2945 /* 2946 * update_array_info is used to change the configuration of an 2947 * on-line array. 2948 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 2949 * fields in the info are checked against the array. 2950 * Any differences that cannot be handled will cause an error. 2951 * Normally, only one change can be managed at a time. 2952 */ 2953 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) 2954 { 2955 int rv = 0; 2956 int cnt = 0; 2957 int state = 0; 2958 2959 /* calculate expected state,ignoring low bits */ 2960 if (mddev->bitmap && mddev->bitmap_offset) 2961 state |= (1 << MD_SB_BITMAP_PRESENT); 2962 2963 if (mddev->major_version != info->major_version || 2964 mddev->minor_version != info->minor_version || 2965 /* mddev->patch_version != info->patch_version || */ 2966 mddev->ctime != info->ctime || 2967 mddev->level != info->level || 2968 /* mddev->layout != info->layout || */ 2969 !mddev->persistent != info->not_persistent|| 2970 mddev->chunk_size != info->chunk_size || 2971 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 2972 ((state^info->state) & 0xfffffe00) 2973 ) 2974 return -EINVAL; 2975 /* Check there is only one change */ 2976 if (mddev->size != info->size) cnt++; 2977 if (mddev->raid_disks != info->raid_disks) cnt++; 2978 if (mddev->layout != info->layout) cnt++; 2979 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; 2980 if (cnt == 0) return 0; 2981 if (cnt > 1) return -EINVAL; 2982 2983 if (mddev->layout != info->layout) { 2984 /* Change layout 2985 * we don't need to do anything at the md level, the 2986 * personality will take care of it all. 2987 */ 2988 if (mddev->pers->reconfig == NULL) 2989 return -EINVAL; 2990 else 2991 return mddev->pers->reconfig(mddev, info->layout, -1); 2992 } 2993 if (mddev->size != info->size) { 2994 mdk_rdev_t * rdev; 2995 struct list_head *tmp; 2996 if (mddev->pers->resize == NULL) 2997 return -EINVAL; 2998 /* The "size" is the amount of each device that is used. 2999 * This can only make sense for arrays with redundancy. 3000 * linear and raid0 always use whatever space is available 3001 * We can only consider changing the size if no resync 3002 * or reconstruction is happening, and if the new size 3003 * is acceptable. It must fit before the sb_offset or, 3004 * if that is <data_offset, it must fit before the 3005 * size of each device. 3006 * If size is zero, we find the largest size that fits. 3007 */ 3008 if (mddev->sync_thread) 3009 return -EBUSY; 3010 ITERATE_RDEV(mddev,rdev,tmp) { 3011 sector_t avail; 3012 int fit = (info->size == 0); 3013 if (rdev->sb_offset > rdev->data_offset) 3014 avail = (rdev->sb_offset*2) - rdev->data_offset; 3015 else 3016 avail = get_capacity(rdev->bdev->bd_disk) 3017 - rdev->data_offset; 3018 if (fit && (info->size == 0 || info->size > avail/2)) 3019 info->size = avail/2; 3020 if (avail < ((sector_t)info->size << 1)) 3021 return -ENOSPC; 3022 } 3023 rv = mddev->pers->resize(mddev, (sector_t)info->size *2); 3024 if (!rv) { 3025 struct block_device *bdev; 3026 3027 bdev = bdget_disk(mddev->gendisk, 0); 3028 if (bdev) { 3029 down(&bdev->bd_inode->i_sem); 3030 i_size_write(bdev->bd_inode, mddev->array_size << 10); 3031 up(&bdev->bd_inode->i_sem); 3032 bdput(bdev); 3033 } 3034 } 3035 } 3036 if (mddev->raid_disks != info->raid_disks) { 3037 /* change the number of raid disks */ 3038 if (mddev->pers->reshape == NULL) 3039 return -EINVAL; 3040 if (info->raid_disks <= 0 || 3041 info->raid_disks >= mddev->max_disks) 3042 return -EINVAL; 3043 if (mddev->sync_thread) 3044 return -EBUSY; 3045 rv = mddev->pers->reshape(mddev, info->raid_disks); 3046 if (!rv) { 3047 struct block_device *bdev; 3048 3049 bdev = bdget_disk(mddev->gendisk, 0); 3050 if (bdev) { 3051 down(&bdev->bd_inode->i_sem); 3052 i_size_write(bdev->bd_inode, mddev->array_size << 10); 3053 up(&bdev->bd_inode->i_sem); 3054 bdput(bdev); 3055 } 3056 } 3057 } 3058 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 3059 if (mddev->pers->quiesce == NULL) 3060 return -EINVAL; 3061 if (mddev->recovery || mddev->sync_thread) 3062 return -EBUSY; 3063 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 3064 /* add the bitmap */ 3065 if (mddev->bitmap) 3066 return -EEXIST; 3067 if (mddev->default_bitmap_offset == 0) 3068 return -EINVAL; 3069 mddev->bitmap_offset = mddev->default_bitmap_offset; 3070 mddev->pers->quiesce(mddev, 1); 3071 rv = bitmap_create(mddev); 3072 if (rv) 3073 bitmap_destroy(mddev); 3074 mddev->pers->quiesce(mddev, 0); 3075 } else { 3076 /* remove the bitmap */ 3077 if (!mddev->bitmap) 3078 return -ENOENT; 3079 if (mddev->bitmap->file) 3080 return -EINVAL; 3081 mddev->pers->quiesce(mddev, 1); 3082 bitmap_destroy(mddev); 3083 mddev->pers->quiesce(mddev, 0); 3084 mddev->bitmap_offset = 0; 3085 } 3086 } 3087 md_update_sb(mddev); 3088 return rv; 3089 } 3090 3091 static int set_disk_faulty(mddev_t *mddev, dev_t dev) 3092 { 3093 mdk_rdev_t *rdev; 3094 3095 if (mddev->pers == NULL) 3096 return -ENODEV; 3097 3098 rdev = find_rdev(mddev, dev); 3099 if (!rdev) 3100 return -ENODEV; 3101 3102 md_error(mddev, rdev); 3103 return 0; 3104 } 3105 3106 static int md_ioctl(struct inode *inode, struct file *file, 3107 unsigned int cmd, unsigned long arg) 3108 { 3109 int err = 0; 3110 void __user *argp = (void __user *)arg; 3111 struct hd_geometry __user *loc = argp; 3112 mddev_t *mddev = NULL; 3113 3114 if (!capable(CAP_SYS_ADMIN)) 3115 return -EACCES; 3116 3117 /* 3118 * Commands dealing with the RAID driver but not any 3119 * particular array: 3120 */ 3121 switch (cmd) 3122 { 3123 case RAID_VERSION: 3124 err = get_version(argp); 3125 goto done; 3126 3127 case PRINT_RAID_DEBUG: 3128 err = 0; 3129 md_print_devices(); 3130 goto done; 3131 3132 #ifndef MODULE 3133 case RAID_AUTORUN: 3134 err = 0; 3135 autostart_arrays(arg); 3136 goto done; 3137 #endif 3138 default:; 3139 } 3140 3141 /* 3142 * Commands creating/starting a new array: 3143 */ 3144 3145 mddev = inode->i_bdev->bd_disk->private_data; 3146 3147 if (!mddev) { 3148 BUG(); 3149 goto abort; 3150 } 3151 3152 3153 if (cmd == START_ARRAY) { 3154 /* START_ARRAY doesn't need to lock the array as autostart_array 3155 * does the locking, and it could even be a different array 3156 */ 3157 static int cnt = 3; 3158 if (cnt > 0 ) { 3159 printk(KERN_WARNING 3160 "md: %s(pid %d) used deprecated START_ARRAY ioctl. " 3161 "This will not be supported beyond July 2006\n", 3162 current->comm, current->pid); 3163 cnt--; 3164 } 3165 err = autostart_array(new_decode_dev(arg)); 3166 if (err) { 3167 printk(KERN_WARNING "md: autostart failed!\n"); 3168 goto abort; 3169 } 3170 goto done; 3171 } 3172 3173 err = mddev_lock(mddev); 3174 if (err) { 3175 printk(KERN_INFO 3176 "md: ioctl lock interrupted, reason %d, cmd %d\n", 3177 err, cmd); 3178 goto abort; 3179 } 3180 3181 switch (cmd) 3182 { 3183 case SET_ARRAY_INFO: 3184 { 3185 mdu_array_info_t info; 3186 if (!arg) 3187 memset(&info, 0, sizeof(info)); 3188 else if (copy_from_user(&info, argp, sizeof(info))) { 3189 err = -EFAULT; 3190 goto abort_unlock; 3191 } 3192 if (mddev->pers) { 3193 err = update_array_info(mddev, &info); 3194 if (err) { 3195 printk(KERN_WARNING "md: couldn't update" 3196 " array info. %d\n", err); 3197 goto abort_unlock; 3198 } 3199 goto done_unlock; 3200 } 3201 if (!list_empty(&mddev->disks)) { 3202 printk(KERN_WARNING 3203 "md: array %s already has disks!\n", 3204 mdname(mddev)); 3205 err = -EBUSY; 3206 goto abort_unlock; 3207 } 3208 if (mddev->raid_disks) { 3209 printk(KERN_WARNING 3210 "md: array %s already initialised!\n", 3211 mdname(mddev)); 3212 err = -EBUSY; 3213 goto abort_unlock; 3214 } 3215 err = set_array_info(mddev, &info); 3216 if (err) { 3217 printk(KERN_WARNING "md: couldn't set" 3218 " array info. %d\n", err); 3219 goto abort_unlock; 3220 } 3221 } 3222 goto done_unlock; 3223 3224 default:; 3225 } 3226 3227 /* 3228 * Commands querying/configuring an existing array: 3229 */ 3230 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 3231 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ 3232 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 3233 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { 3234 err = -ENODEV; 3235 goto abort_unlock; 3236 } 3237 3238 /* 3239 * Commands even a read-only array can execute: 3240 */ 3241 switch (cmd) 3242 { 3243 case GET_ARRAY_INFO: 3244 err = get_array_info(mddev, argp); 3245 goto done_unlock; 3246 3247 case GET_BITMAP_FILE: 3248 err = get_bitmap_file(mddev, argp); 3249 goto done_unlock; 3250 3251 case GET_DISK_INFO: 3252 err = get_disk_info(mddev, argp); 3253 goto done_unlock; 3254 3255 case RESTART_ARRAY_RW: 3256 err = restart_array(mddev); 3257 goto done_unlock; 3258 3259 case STOP_ARRAY: 3260 err = do_md_stop (mddev, 0); 3261 goto done_unlock; 3262 3263 case STOP_ARRAY_RO: 3264 err = do_md_stop (mddev, 1); 3265 goto done_unlock; 3266 3267 /* 3268 * We have a problem here : there is no easy way to give a CHS 3269 * virtual geometry. We currently pretend that we have a 2 heads 3270 * 4 sectors (with a BIG number of cylinders...). This drives 3271 * dosfs just mad... ;-) 3272 */ 3273 case HDIO_GETGEO: 3274 if (!loc) { 3275 err = -EINVAL; 3276 goto abort_unlock; 3277 } 3278 err = put_user (2, (char __user *) &loc->heads); 3279 if (err) 3280 goto abort_unlock; 3281 err = put_user (4, (char __user *) &loc->sectors); 3282 if (err) 3283 goto abort_unlock; 3284 err = put_user(get_capacity(mddev->gendisk)/8, 3285 (short __user *) &loc->cylinders); 3286 if (err) 3287 goto abort_unlock; 3288 err = put_user (get_start_sect(inode->i_bdev), 3289 (long __user *) &loc->start); 3290 goto done_unlock; 3291 } 3292 3293 /* 3294 * The remaining ioctls are changing the state of the 3295 * superblock, so we do not allow them on read-only arrays. 3296 * However non-MD ioctls (e.g. get-size) will still come through 3297 * here and hit the 'default' below, so only disallow 3298 * 'md' ioctls, and switch to rw mode if started auto-readonly. 3299 */ 3300 if (_IOC_TYPE(cmd) == MD_MAJOR && 3301 mddev->ro && mddev->pers) { 3302 if (mddev->ro == 2) { 3303 mddev->ro = 0; 3304 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3305 md_wakeup_thread(mddev->thread); 3306 3307 } else { 3308 err = -EROFS; 3309 goto abort_unlock; 3310 } 3311 } 3312 3313 switch (cmd) 3314 { 3315 case ADD_NEW_DISK: 3316 { 3317 mdu_disk_info_t info; 3318 if (copy_from_user(&info, argp, sizeof(info))) 3319 err = -EFAULT; 3320 else 3321 err = add_new_disk(mddev, &info); 3322 goto done_unlock; 3323 } 3324 3325 case HOT_REMOVE_DISK: 3326 err = hot_remove_disk(mddev, new_decode_dev(arg)); 3327 goto done_unlock; 3328 3329 case HOT_ADD_DISK: 3330 err = hot_add_disk(mddev, new_decode_dev(arg)); 3331 goto done_unlock; 3332 3333 case SET_DISK_FAULTY: 3334 err = set_disk_faulty(mddev, new_decode_dev(arg)); 3335 goto done_unlock; 3336 3337 case RUN_ARRAY: 3338 err = do_md_run (mddev); 3339 goto done_unlock; 3340 3341 case SET_BITMAP_FILE: 3342 err = set_bitmap_file(mddev, (int)arg); 3343 goto done_unlock; 3344 3345 default: 3346 if (_IOC_TYPE(cmd) == MD_MAJOR) 3347 printk(KERN_WARNING "md: %s(pid %d) used" 3348 " obsolete MD ioctl, upgrade your" 3349 " software to use new ictls.\n", 3350 current->comm, current->pid); 3351 err = -EINVAL; 3352 goto abort_unlock; 3353 } 3354 3355 done_unlock: 3356 abort_unlock: 3357 mddev_unlock(mddev); 3358 3359 return err; 3360 done: 3361 if (err) 3362 MD_BUG(); 3363 abort: 3364 return err; 3365 } 3366 3367 static int md_open(struct inode *inode, struct file *file) 3368 { 3369 /* 3370 * Succeed if we can lock the mddev, which confirms that 3371 * it isn't being stopped right now. 3372 */ 3373 mddev_t *mddev = inode->i_bdev->bd_disk->private_data; 3374 int err; 3375 3376 if ((err = mddev_lock(mddev))) 3377 goto out; 3378 3379 err = 0; 3380 mddev_get(mddev); 3381 mddev_unlock(mddev); 3382 3383 check_disk_change(inode->i_bdev); 3384 out: 3385 return err; 3386 } 3387 3388 static int md_release(struct inode *inode, struct file * file) 3389 { 3390 mddev_t *mddev = inode->i_bdev->bd_disk->private_data; 3391 3392 if (!mddev) 3393 BUG(); 3394 mddev_put(mddev); 3395 3396 return 0; 3397 } 3398 3399 static int md_media_changed(struct gendisk *disk) 3400 { 3401 mddev_t *mddev = disk->private_data; 3402 3403 return mddev->changed; 3404 } 3405 3406 static int md_revalidate(struct gendisk *disk) 3407 { 3408 mddev_t *mddev = disk->private_data; 3409 3410 mddev->changed = 0; 3411 return 0; 3412 } 3413 static struct block_device_operations md_fops = 3414 { 3415 .owner = THIS_MODULE, 3416 .open = md_open, 3417 .release = md_release, 3418 .ioctl = md_ioctl, 3419 .media_changed = md_media_changed, 3420 .revalidate_disk= md_revalidate, 3421 }; 3422 3423 static int md_thread(void * arg) 3424 { 3425 mdk_thread_t *thread = arg; 3426 3427 /* 3428 * md_thread is a 'system-thread', it's priority should be very 3429 * high. We avoid resource deadlocks individually in each 3430 * raid personality. (RAID5 does preallocation) We also use RR and 3431 * the very same RT priority as kswapd, thus we will never get 3432 * into a priority inversion deadlock. 3433 * 3434 * we definitely have to have equal or higher priority than 3435 * bdflush, otherwise bdflush will deadlock if there are too 3436 * many dirty RAID5 blocks. 3437 */ 3438 3439 allow_signal(SIGKILL); 3440 while (!kthread_should_stop()) { 3441 3442 /* We need to wait INTERRUPTIBLE so that 3443 * we don't add to the load-average. 3444 * That means we need to be sure no signals are 3445 * pending 3446 */ 3447 if (signal_pending(current)) 3448 flush_signals(current); 3449 3450 wait_event_interruptible_timeout 3451 (thread->wqueue, 3452 test_bit(THREAD_WAKEUP, &thread->flags) 3453 || kthread_should_stop(), 3454 thread->timeout); 3455 try_to_freeze(); 3456 3457 clear_bit(THREAD_WAKEUP, &thread->flags); 3458 3459 thread->run(thread->mddev); 3460 } 3461 3462 return 0; 3463 } 3464 3465 void md_wakeup_thread(mdk_thread_t *thread) 3466 { 3467 if (thread) { 3468 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); 3469 set_bit(THREAD_WAKEUP, &thread->flags); 3470 wake_up(&thread->wqueue); 3471 } 3472 } 3473 3474 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, 3475 const char *name) 3476 { 3477 mdk_thread_t *thread; 3478 3479 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL); 3480 if (!thread) 3481 return NULL; 3482 3483 memset(thread, 0, sizeof(mdk_thread_t)); 3484 init_waitqueue_head(&thread->wqueue); 3485 3486 thread->run = run; 3487 thread->mddev = mddev; 3488 thread->timeout = MAX_SCHEDULE_TIMEOUT; 3489 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); 3490 if (IS_ERR(thread->tsk)) { 3491 kfree(thread); 3492 return NULL; 3493 } 3494 return thread; 3495 } 3496 3497 void md_unregister_thread(mdk_thread_t *thread) 3498 { 3499 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); 3500 3501 kthread_stop(thread->tsk); 3502 kfree(thread); 3503 } 3504 3505 void md_error(mddev_t *mddev, mdk_rdev_t *rdev) 3506 { 3507 if (!mddev) { 3508 MD_BUG(); 3509 return; 3510 } 3511 3512 if (!rdev || test_bit(Faulty, &rdev->flags)) 3513 return; 3514 /* 3515 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", 3516 mdname(mddev), 3517 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), 3518 __builtin_return_address(0),__builtin_return_address(1), 3519 __builtin_return_address(2),__builtin_return_address(3)); 3520 */ 3521 if (!mddev->pers->error_handler) 3522 return; 3523 mddev->pers->error_handler(mddev,rdev); 3524 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 3525 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3526 md_wakeup_thread(mddev->thread); 3527 } 3528 3529 /* seq_file implementation /proc/mdstat */ 3530 3531 static void status_unused(struct seq_file *seq) 3532 { 3533 int i = 0; 3534 mdk_rdev_t *rdev; 3535 struct list_head *tmp; 3536 3537 seq_printf(seq, "unused devices: "); 3538 3539 ITERATE_RDEV_PENDING(rdev,tmp) { 3540 char b[BDEVNAME_SIZE]; 3541 i++; 3542 seq_printf(seq, "%s ", 3543 bdevname(rdev->bdev,b)); 3544 } 3545 if (!i) 3546 seq_printf(seq, "<none>"); 3547 3548 seq_printf(seq, "\n"); 3549 } 3550 3551 3552 static void status_resync(struct seq_file *seq, mddev_t * mddev) 3553 { 3554 unsigned long max_blocks, resync, res, dt, db, rt; 3555 3556 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; 3557 3558 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 3559 max_blocks = mddev->resync_max_sectors >> 1; 3560 else 3561 max_blocks = mddev->size; 3562 3563 /* 3564 * Should not happen. 3565 */ 3566 if (!max_blocks) { 3567 MD_BUG(); 3568 return; 3569 } 3570 res = (resync/1024)*1000/(max_blocks/1024 + 1); 3571 { 3572 int i, x = res/50, y = 20-x; 3573 seq_printf(seq, "["); 3574 for (i = 0; i < x; i++) 3575 seq_printf(seq, "="); 3576 seq_printf(seq, ">"); 3577 for (i = 0; i < y; i++) 3578 seq_printf(seq, "."); 3579 seq_printf(seq, "] "); 3580 } 3581 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", 3582 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 3583 "resync" : "recovery"), 3584 res/10, res % 10, resync, max_blocks); 3585 3586 /* 3587 * We do not want to overflow, so the order of operands and 3588 * the * 100 / 100 trick are important. We do a +1 to be 3589 * safe against division by zero. We only estimate anyway. 3590 * 3591 * dt: time from mark until now 3592 * db: blocks written from mark until now 3593 * rt: remaining time 3594 */ 3595 dt = ((jiffies - mddev->resync_mark) / HZ); 3596 if (!dt) dt++; 3597 db = resync - (mddev->resync_mark_cnt/2); 3598 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; 3599 3600 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); 3601 3602 seq_printf(seq, " speed=%ldK/sec", db/dt); 3603 } 3604 3605 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 3606 { 3607 struct list_head *tmp; 3608 loff_t l = *pos; 3609 mddev_t *mddev; 3610 3611 if (l >= 0x10000) 3612 return NULL; 3613 if (!l--) 3614 /* header */ 3615 return (void*)1; 3616 3617 spin_lock(&all_mddevs_lock); 3618 list_for_each(tmp,&all_mddevs) 3619 if (!l--) { 3620 mddev = list_entry(tmp, mddev_t, all_mddevs); 3621 mddev_get(mddev); 3622 spin_unlock(&all_mddevs_lock); 3623 return mddev; 3624 } 3625 spin_unlock(&all_mddevs_lock); 3626 if (!l--) 3627 return (void*)2;/* tail */ 3628 return NULL; 3629 } 3630 3631 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3632 { 3633 struct list_head *tmp; 3634 mddev_t *next_mddev, *mddev = v; 3635 3636 ++*pos; 3637 if (v == (void*)2) 3638 return NULL; 3639 3640 spin_lock(&all_mddevs_lock); 3641 if (v == (void*)1) 3642 tmp = all_mddevs.next; 3643 else 3644 tmp = mddev->all_mddevs.next; 3645 if (tmp != &all_mddevs) 3646 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); 3647 else { 3648 next_mddev = (void*)2; 3649 *pos = 0x10000; 3650 } 3651 spin_unlock(&all_mddevs_lock); 3652 3653 if (v != (void*)1) 3654 mddev_put(mddev); 3655 return next_mddev; 3656 3657 } 3658 3659 static void md_seq_stop(struct seq_file *seq, void *v) 3660 { 3661 mddev_t *mddev = v; 3662 3663 if (mddev && v != (void*)1 && v != (void*)2) 3664 mddev_put(mddev); 3665 } 3666 3667 static int md_seq_show(struct seq_file *seq, void *v) 3668 { 3669 mddev_t *mddev = v; 3670 sector_t size; 3671 struct list_head *tmp2; 3672 mdk_rdev_t *rdev; 3673 int i; 3674 struct bitmap *bitmap; 3675 3676 if (v == (void*)1) { 3677 seq_printf(seq, "Personalities : "); 3678 spin_lock(&pers_lock); 3679 for (i = 0; i < MAX_PERSONALITY; i++) 3680 if (pers[i]) 3681 seq_printf(seq, "[%s] ", pers[i]->name); 3682 3683 spin_unlock(&pers_lock); 3684 seq_printf(seq, "\n"); 3685 return 0; 3686 } 3687 if (v == (void*)2) { 3688 status_unused(seq); 3689 return 0; 3690 } 3691 3692 if (mddev_lock(mddev)!=0) 3693 return -EINTR; 3694 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 3695 seq_printf(seq, "%s : %sactive", mdname(mddev), 3696 mddev->pers ? "" : "in"); 3697 if (mddev->pers) { 3698 if (mddev->ro==1) 3699 seq_printf(seq, " (read-only)"); 3700 if (mddev->ro==2) 3701 seq_printf(seq, "(auto-read-only)"); 3702 seq_printf(seq, " %s", mddev->pers->name); 3703 } 3704 3705 size = 0; 3706 ITERATE_RDEV(mddev,rdev,tmp2) { 3707 char b[BDEVNAME_SIZE]; 3708 seq_printf(seq, " %s[%d]", 3709 bdevname(rdev->bdev,b), rdev->desc_nr); 3710 if (test_bit(WriteMostly, &rdev->flags)) 3711 seq_printf(seq, "(W)"); 3712 if (test_bit(Faulty, &rdev->flags)) { 3713 seq_printf(seq, "(F)"); 3714 continue; 3715 } else if (rdev->raid_disk < 0) 3716 seq_printf(seq, "(S)"); /* spare */ 3717 size += rdev->size; 3718 } 3719 3720 if (!list_empty(&mddev->disks)) { 3721 if (mddev->pers) 3722 seq_printf(seq, "\n %llu blocks", 3723 (unsigned long long)mddev->array_size); 3724 else 3725 seq_printf(seq, "\n %llu blocks", 3726 (unsigned long long)size); 3727 } 3728 if (mddev->persistent) { 3729 if (mddev->major_version != 0 || 3730 mddev->minor_version != 90) { 3731 seq_printf(seq," super %d.%d", 3732 mddev->major_version, 3733 mddev->minor_version); 3734 } 3735 } else 3736 seq_printf(seq, " super non-persistent"); 3737 3738 if (mddev->pers) { 3739 mddev->pers->status (seq, mddev); 3740 seq_printf(seq, "\n "); 3741 if (mddev->pers->sync_request) { 3742 if (mddev->curr_resync > 2) { 3743 status_resync (seq, mddev); 3744 seq_printf(seq, "\n "); 3745 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) 3746 seq_printf(seq, "\tresync=DELAYED\n "); 3747 else if (mddev->recovery_cp < MaxSector) 3748 seq_printf(seq, "\tresync=PENDING\n "); 3749 } 3750 } else 3751 seq_printf(seq, "\n "); 3752 3753 if ((bitmap = mddev->bitmap)) { 3754 unsigned long chunk_kb; 3755 unsigned long flags; 3756 spin_lock_irqsave(&bitmap->lock, flags); 3757 chunk_kb = bitmap->chunksize >> 10; 3758 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " 3759 "%lu%s chunk", 3760 bitmap->pages - bitmap->missing_pages, 3761 bitmap->pages, 3762 (bitmap->pages - bitmap->missing_pages) 3763 << (PAGE_SHIFT - 10), 3764 chunk_kb ? chunk_kb : bitmap->chunksize, 3765 chunk_kb ? "KB" : "B"); 3766 if (bitmap->file) { 3767 seq_printf(seq, ", file: "); 3768 seq_path(seq, bitmap->file->f_vfsmnt, 3769 bitmap->file->f_dentry," \t\n"); 3770 } 3771 3772 seq_printf(seq, "\n"); 3773 spin_unlock_irqrestore(&bitmap->lock, flags); 3774 } 3775 3776 seq_printf(seq, "\n"); 3777 } 3778 mddev_unlock(mddev); 3779 3780 return 0; 3781 } 3782 3783 static struct seq_operations md_seq_ops = { 3784 .start = md_seq_start, 3785 .next = md_seq_next, 3786 .stop = md_seq_stop, 3787 .show = md_seq_show, 3788 }; 3789 3790 static int md_seq_open(struct inode *inode, struct file *file) 3791 { 3792 int error; 3793 3794 error = seq_open(file, &md_seq_ops); 3795 return error; 3796 } 3797 3798 static struct file_operations md_seq_fops = { 3799 .open = md_seq_open, 3800 .read = seq_read, 3801 .llseek = seq_lseek, 3802 .release = seq_release, 3803 }; 3804 3805 int register_md_personality(int pnum, mdk_personality_t *p) 3806 { 3807 if (pnum >= MAX_PERSONALITY) { 3808 printk(KERN_ERR 3809 "md: tried to install personality %s as nr %d, but max is %lu\n", 3810 p->name, pnum, MAX_PERSONALITY-1); 3811 return -EINVAL; 3812 } 3813 3814 spin_lock(&pers_lock); 3815 if (pers[pnum]) { 3816 spin_unlock(&pers_lock); 3817 return -EBUSY; 3818 } 3819 3820 pers[pnum] = p; 3821 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum); 3822 spin_unlock(&pers_lock); 3823 return 0; 3824 } 3825 3826 int unregister_md_personality(int pnum) 3827 { 3828 if (pnum >= MAX_PERSONALITY) 3829 return -EINVAL; 3830 3831 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name); 3832 spin_lock(&pers_lock); 3833 pers[pnum] = NULL; 3834 spin_unlock(&pers_lock); 3835 return 0; 3836 } 3837 3838 static int is_mddev_idle(mddev_t *mddev) 3839 { 3840 mdk_rdev_t * rdev; 3841 struct list_head *tmp; 3842 int idle; 3843 unsigned long curr_events; 3844 3845 idle = 1; 3846 ITERATE_RDEV(mddev,rdev,tmp) { 3847 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 3848 curr_events = disk_stat_read(disk, sectors[0]) + 3849 disk_stat_read(disk, sectors[1]) - 3850 atomic_read(&disk->sync_io); 3851 /* The difference between curr_events and last_events 3852 * will be affected by any new non-sync IO (making 3853 * curr_events bigger) and any difference in the amount of 3854 * in-flight syncio (making current_events bigger or smaller) 3855 * The amount in-flight is currently limited to 3856 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 3857 * which is at most 4096 sectors. 3858 * These numbers are fairly fragile and should be made 3859 * more robust, probably by enforcing the 3860 * 'window size' that md_do_sync sort-of uses. 3861 * 3862 * Note: the following is an unsigned comparison. 3863 */ 3864 if ((curr_events - rdev->last_events + 4096) > 8192) { 3865 rdev->last_events = curr_events; 3866 idle = 0; 3867 } 3868 } 3869 return idle; 3870 } 3871 3872 void md_done_sync(mddev_t *mddev, int blocks, int ok) 3873 { 3874 /* another "blocks" (512byte) blocks have been synced */ 3875 atomic_sub(blocks, &mddev->recovery_active); 3876 wake_up(&mddev->recovery_wait); 3877 if (!ok) { 3878 set_bit(MD_RECOVERY_ERR, &mddev->recovery); 3879 md_wakeup_thread(mddev->thread); 3880 // stop recovery, signal do_sync .... 3881 } 3882 } 3883 3884 3885 /* md_write_start(mddev, bi) 3886 * If we need to update some array metadata (e.g. 'active' flag 3887 * in superblock) before writing, schedule a superblock update 3888 * and wait for it to complete. 3889 */ 3890 void md_write_start(mddev_t *mddev, struct bio *bi) 3891 { 3892 if (bio_data_dir(bi) != WRITE) 3893 return; 3894 3895 BUG_ON(mddev->ro == 1); 3896 if (mddev->ro == 2) { 3897 /* need to switch to read/write */ 3898 mddev->ro = 0; 3899 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3900 md_wakeup_thread(mddev->thread); 3901 } 3902 atomic_inc(&mddev->writes_pending); 3903 if (mddev->in_sync) { 3904 spin_lock_irq(&mddev->write_lock); 3905 if (mddev->in_sync) { 3906 mddev->in_sync = 0; 3907 mddev->sb_dirty = 1; 3908 md_wakeup_thread(mddev->thread); 3909 } 3910 spin_unlock_irq(&mddev->write_lock); 3911 } 3912 wait_event(mddev->sb_wait, mddev->sb_dirty==0); 3913 } 3914 3915 void md_write_end(mddev_t *mddev) 3916 { 3917 if (atomic_dec_and_test(&mddev->writes_pending)) { 3918 if (mddev->safemode == 2) 3919 md_wakeup_thread(mddev->thread); 3920 else 3921 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 3922 } 3923 } 3924 3925 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 3926 3927 #define SYNC_MARKS 10 3928 #define SYNC_MARK_STEP (3*HZ) 3929 static void md_do_sync(mddev_t *mddev) 3930 { 3931 mddev_t *mddev2; 3932 unsigned int currspeed = 0, 3933 window; 3934 sector_t max_sectors,j, io_sectors; 3935 unsigned long mark[SYNC_MARKS]; 3936 sector_t mark_cnt[SYNC_MARKS]; 3937 int last_mark,m; 3938 struct list_head *tmp; 3939 sector_t last_check; 3940 int skipped = 0; 3941 3942 /* just incase thread restarts... */ 3943 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 3944 return; 3945 3946 /* we overload curr_resync somewhat here. 3947 * 0 == not engaged in resync at all 3948 * 2 == checking that there is no conflict with another sync 3949 * 1 == like 2, but have yielded to allow conflicting resync to 3950 * commense 3951 * other == active in resync - this many blocks 3952 * 3953 * Before starting a resync we must have set curr_resync to 3954 * 2, and then checked that every "conflicting" array has curr_resync 3955 * less than ours. When we find one that is the same or higher 3956 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 3957 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 3958 * This will mean we have to start checking from the beginning again. 3959 * 3960 */ 3961 3962 do { 3963 mddev->curr_resync = 2; 3964 3965 try_again: 3966 if (kthread_should_stop()) { 3967 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 3968 goto skip; 3969 } 3970 ITERATE_MDDEV(mddev2,tmp) { 3971 if (mddev2 == mddev) 3972 continue; 3973 if (mddev2->curr_resync && 3974 match_mddev_units(mddev,mddev2)) { 3975 DEFINE_WAIT(wq); 3976 if (mddev < mddev2 && mddev->curr_resync == 2) { 3977 /* arbitrarily yield */ 3978 mddev->curr_resync = 1; 3979 wake_up(&resync_wait); 3980 } 3981 if (mddev > mddev2 && mddev->curr_resync == 1) 3982 /* no need to wait here, we can wait the next 3983 * time 'round when curr_resync == 2 3984 */ 3985 continue; 3986 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); 3987 if (!kthread_should_stop() && 3988 mddev2->curr_resync >= mddev->curr_resync) { 3989 printk(KERN_INFO "md: delaying resync of %s" 3990 " until %s has finished resync (they" 3991 " share one or more physical units)\n", 3992 mdname(mddev), mdname(mddev2)); 3993 mddev_put(mddev2); 3994 schedule(); 3995 finish_wait(&resync_wait, &wq); 3996 goto try_again; 3997 } 3998 finish_wait(&resync_wait, &wq); 3999 } 4000 } 4001 } while (mddev->curr_resync < 2); 4002 4003 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 4004 /* resync follows the size requested by the personality, 4005 * which defaults to physical size, but can be virtual size 4006 */ 4007 max_sectors = mddev->resync_max_sectors; 4008 mddev->resync_mismatches = 0; 4009 } else 4010 /* recovery follows the physical size of devices */ 4011 max_sectors = mddev->size << 1; 4012 4013 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); 4014 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" 4015 " %d KB/sec/disc.\n", sysctl_speed_limit_min); 4016 printk(KERN_INFO "md: using maximum available idle IO bandwidth " 4017 "(but not more than %d KB/sec) for reconstruction.\n", 4018 sysctl_speed_limit_max); 4019 4020 is_mddev_idle(mddev); /* this also initializes IO event counters */ 4021 /* we don't use the checkpoint if there's a bitmap */ 4022 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap 4023 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 4024 j = mddev->recovery_cp; 4025 else 4026 j = 0; 4027 io_sectors = 0; 4028 for (m = 0; m < SYNC_MARKS; m++) { 4029 mark[m] = jiffies; 4030 mark_cnt[m] = io_sectors; 4031 } 4032 last_mark = 0; 4033 mddev->resync_mark = mark[last_mark]; 4034 mddev->resync_mark_cnt = mark_cnt[last_mark]; 4035 4036 /* 4037 * Tune reconstruction: 4038 */ 4039 window = 32*(PAGE_SIZE/512); 4040 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", 4041 window/2,(unsigned long long) max_sectors/2); 4042 4043 atomic_set(&mddev->recovery_active, 0); 4044 init_waitqueue_head(&mddev->recovery_wait); 4045 last_check = 0; 4046 4047 if (j>2) { 4048 printk(KERN_INFO 4049 "md: resuming recovery of %s from checkpoint.\n", 4050 mdname(mddev)); 4051 mddev->curr_resync = j; 4052 } 4053 4054 while (j < max_sectors) { 4055 sector_t sectors; 4056 4057 skipped = 0; 4058 sectors = mddev->pers->sync_request(mddev, j, &skipped, 4059 currspeed < sysctl_speed_limit_min); 4060 if (sectors == 0) { 4061 set_bit(MD_RECOVERY_ERR, &mddev->recovery); 4062 goto out; 4063 } 4064 4065 if (!skipped) { /* actual IO requested */ 4066 io_sectors += sectors; 4067 atomic_add(sectors, &mddev->recovery_active); 4068 } 4069 4070 j += sectors; 4071 if (j>1) mddev->curr_resync = j; 4072 4073 4074 if (last_check + window > io_sectors || j == max_sectors) 4075 continue; 4076 4077 last_check = io_sectors; 4078 4079 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || 4080 test_bit(MD_RECOVERY_ERR, &mddev->recovery)) 4081 break; 4082 4083 repeat: 4084 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 4085 /* step marks */ 4086 int next = (last_mark+1) % SYNC_MARKS; 4087 4088 mddev->resync_mark = mark[next]; 4089 mddev->resync_mark_cnt = mark_cnt[next]; 4090 mark[next] = jiffies; 4091 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 4092 last_mark = next; 4093 } 4094 4095 4096 if (kthread_should_stop()) { 4097 /* 4098 * got a signal, exit. 4099 */ 4100 printk(KERN_INFO 4101 "md: md_do_sync() got signal ... exiting\n"); 4102 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4103 goto out; 4104 } 4105 4106 /* 4107 * this loop exits only if either when we are slower than 4108 * the 'hard' speed limit, or the system was IO-idle for 4109 * a jiffy. 4110 * the system might be non-idle CPU-wise, but we only care 4111 * about not overloading the IO subsystem. (things like an 4112 * e2fsck being done on the RAID array should execute fast) 4113 */ 4114 mddev->queue->unplug_fn(mddev->queue); 4115 cond_resched(); 4116 4117 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 4118 /((jiffies-mddev->resync_mark)/HZ +1) +1; 4119 4120 if (currspeed > sysctl_speed_limit_min) { 4121 if ((currspeed > sysctl_speed_limit_max) || 4122 !is_mddev_idle(mddev)) { 4123 msleep(500); 4124 goto repeat; 4125 } 4126 } 4127 } 4128 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); 4129 /* 4130 * this also signals 'finished resyncing' to md_stop 4131 */ 4132 out: 4133 mddev->queue->unplug_fn(mddev->queue); 4134 4135 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 4136 4137 /* tell personality that we are finished */ 4138 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); 4139 4140 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && 4141 mddev->curr_resync > 2 && 4142 mddev->curr_resync >= mddev->recovery_cp) { 4143 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 4144 printk(KERN_INFO 4145 "md: checkpointing recovery of %s.\n", 4146 mdname(mddev)); 4147 mddev->recovery_cp = mddev->curr_resync; 4148 } else 4149 mddev->recovery_cp = MaxSector; 4150 } 4151 4152 skip: 4153 mddev->curr_resync = 0; 4154 wake_up(&resync_wait); 4155 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 4156 md_wakeup_thread(mddev->thread); 4157 } 4158 4159 4160 /* 4161 * This routine is regularly called by all per-raid-array threads to 4162 * deal with generic issues like resync and super-block update. 4163 * Raid personalities that don't have a thread (linear/raid0) do not 4164 * need this as they never do any recovery or update the superblock. 4165 * 4166 * It does not do any resync itself, but rather "forks" off other threads 4167 * to do that as needed. 4168 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 4169 * "->recovery" and create a thread at ->sync_thread. 4170 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) 4171 * and wakeups up this thread which will reap the thread and finish up. 4172 * This thread also removes any faulty devices (with nr_pending == 0). 4173 * 4174 * The overall approach is: 4175 * 1/ if the superblock needs updating, update it. 4176 * 2/ If a recovery thread is running, don't do anything else. 4177 * 3/ If recovery has finished, clean up, possibly marking spares active. 4178 * 4/ If there are any faulty devices, remove them. 4179 * 5/ If array is degraded, try to add spares devices 4180 * 6/ If array has spares or is not in-sync, start a resync thread. 4181 */ 4182 void md_check_recovery(mddev_t *mddev) 4183 { 4184 mdk_rdev_t *rdev; 4185 struct list_head *rtmp; 4186 4187 4188 if (mddev->bitmap) 4189 bitmap_daemon_work(mddev->bitmap); 4190 4191 if (mddev->ro) 4192 return; 4193 4194 if (signal_pending(current)) { 4195 if (mddev->pers->sync_request) { 4196 printk(KERN_INFO "md: %s in immediate safe mode\n", 4197 mdname(mddev)); 4198 mddev->safemode = 2; 4199 } 4200 flush_signals(current); 4201 } 4202 4203 if ( ! ( 4204 mddev->sb_dirty || 4205 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 4206 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 4207 (mddev->safemode == 1) || 4208 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 4209 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 4210 )) 4211 return; 4212 4213 if (mddev_trylock(mddev)==0) { 4214 int spares =0; 4215 4216 spin_lock_irq(&mddev->write_lock); 4217 if (mddev->safemode && !atomic_read(&mddev->writes_pending) && 4218 !mddev->in_sync && mddev->recovery_cp == MaxSector) { 4219 mddev->in_sync = 1; 4220 mddev->sb_dirty = 1; 4221 } 4222 if (mddev->safemode == 1) 4223 mddev->safemode = 0; 4224 spin_unlock_irq(&mddev->write_lock); 4225 4226 if (mddev->sb_dirty) 4227 md_update_sb(mddev); 4228 4229 4230 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 4231 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 4232 /* resync/recovery still happening */ 4233 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4234 goto unlock; 4235 } 4236 if (mddev->sync_thread) { 4237 /* resync has finished, collect result */ 4238 md_unregister_thread(mddev->sync_thread); 4239 mddev->sync_thread = NULL; 4240 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && 4241 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 4242 /* success...*/ 4243 /* activate any spares */ 4244 mddev->pers->spare_active(mddev); 4245 } 4246 md_update_sb(mddev); 4247 4248 /* if array is no-longer degraded, then any saved_raid_disk 4249 * information must be scrapped 4250 */ 4251 if (!mddev->degraded) 4252 ITERATE_RDEV(mddev,rdev,rtmp) 4253 rdev->saved_raid_disk = -1; 4254 4255 mddev->recovery = 0; 4256 /* flag recovery needed just to double check */ 4257 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4258 goto unlock; 4259 } 4260 /* Clear some bits that don't mean anything, but 4261 * might be left set 4262 */ 4263 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4264 clear_bit(MD_RECOVERY_ERR, &mddev->recovery); 4265 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 4266 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 4267 4268 /* no recovery is running. 4269 * remove any failed drives, then 4270 * add spares if possible. 4271 * Spare are also removed and re-added, to allow 4272 * the personality to fail the re-add. 4273 */ 4274 ITERATE_RDEV(mddev,rdev,rtmp) 4275 if (rdev->raid_disk >= 0 && 4276 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && 4277 atomic_read(&rdev->nr_pending)==0) { 4278 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { 4279 char nm[20]; 4280 sprintf(nm,"rd%d", rdev->raid_disk); 4281 sysfs_remove_link(&mddev->kobj, nm); 4282 rdev->raid_disk = -1; 4283 } 4284 } 4285 4286 if (mddev->degraded) { 4287 ITERATE_RDEV(mddev,rdev,rtmp) 4288 if (rdev->raid_disk < 0 4289 && !test_bit(Faulty, &rdev->flags)) { 4290 if (mddev->pers->hot_add_disk(mddev,rdev)) { 4291 char nm[20]; 4292 sprintf(nm, "rd%d", rdev->raid_disk); 4293 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 4294 spares++; 4295 } else 4296 break; 4297 } 4298 } 4299 4300 if (spares) { 4301 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4302 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4303 } else if (mddev->recovery_cp < MaxSector) { 4304 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4305 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 4306 /* nothing to be done ... */ 4307 goto unlock; 4308 4309 if (mddev->pers->sync_request) { 4310 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 4311 if (spares && mddev->bitmap && ! mddev->bitmap->file) { 4312 /* We are adding a device or devices to an array 4313 * which has the bitmap stored on all devices. 4314 * So make sure all bitmap pages get written 4315 */ 4316 bitmap_write_all(mddev->bitmap); 4317 } 4318 mddev->sync_thread = md_register_thread(md_do_sync, 4319 mddev, 4320 "%s_resync"); 4321 if (!mddev->sync_thread) { 4322 printk(KERN_ERR "%s: could not start resync" 4323 " thread...\n", 4324 mdname(mddev)); 4325 /* leave the spares where they are, it shouldn't hurt */ 4326 mddev->recovery = 0; 4327 } else { 4328 md_wakeup_thread(mddev->sync_thread); 4329 } 4330 } 4331 unlock: 4332 mddev_unlock(mddev); 4333 } 4334 } 4335 4336 static int md_notify_reboot(struct notifier_block *this, 4337 unsigned long code, void *x) 4338 { 4339 struct list_head *tmp; 4340 mddev_t *mddev; 4341 4342 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { 4343 4344 printk(KERN_INFO "md: stopping all md devices.\n"); 4345 4346 ITERATE_MDDEV(mddev,tmp) 4347 if (mddev_trylock(mddev)==0) 4348 do_md_stop (mddev, 1); 4349 /* 4350 * certain more exotic SCSI devices are known to be 4351 * volatile wrt too early system reboots. While the 4352 * right place to handle this issue is the given 4353 * driver, we do want to have a safe RAID driver ... 4354 */ 4355 mdelay(1000*1); 4356 } 4357 return NOTIFY_DONE; 4358 } 4359 4360 static struct notifier_block md_notifier = { 4361 .notifier_call = md_notify_reboot, 4362 .next = NULL, 4363 .priority = INT_MAX, /* before any real devices */ 4364 }; 4365 4366 static void md_geninit(void) 4367 { 4368 struct proc_dir_entry *p; 4369 4370 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 4371 4372 p = create_proc_entry("mdstat", S_IRUGO, NULL); 4373 if (p) 4374 p->proc_fops = &md_seq_fops; 4375 } 4376 4377 static int __init md_init(void) 4378 { 4379 int minor; 4380 4381 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," 4382 " MD_SB_DISKS=%d\n", 4383 MD_MAJOR_VERSION, MD_MINOR_VERSION, 4384 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); 4385 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, 4386 BITMAP_MINOR); 4387 4388 if (register_blkdev(MAJOR_NR, "md")) 4389 return -1; 4390 if ((mdp_major=register_blkdev(0, "mdp"))<=0) { 4391 unregister_blkdev(MAJOR_NR, "md"); 4392 return -1; 4393 } 4394 devfs_mk_dir("md"); 4395 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, 4396 md_probe, NULL, NULL); 4397 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, 4398 md_probe, NULL, NULL); 4399 4400 for (minor=0; minor < MAX_MD_DEVS; ++minor) 4401 devfs_mk_bdev(MKDEV(MAJOR_NR, minor), 4402 S_IFBLK|S_IRUSR|S_IWUSR, 4403 "md/%d", minor); 4404 4405 for (minor=0; minor < MAX_MD_DEVS; ++minor) 4406 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), 4407 S_IFBLK|S_IRUSR|S_IWUSR, 4408 "md/mdp%d", minor); 4409 4410 4411 register_reboot_notifier(&md_notifier); 4412 raid_table_header = register_sysctl_table(raid_root_table, 1); 4413 4414 md_geninit(); 4415 return (0); 4416 } 4417 4418 4419 #ifndef MODULE 4420 4421 /* 4422 * Searches all registered partitions for autorun RAID arrays 4423 * at boot time. 4424 */ 4425 static dev_t detected_devices[128]; 4426 static int dev_cnt; 4427 4428 void md_autodetect_dev(dev_t dev) 4429 { 4430 if (dev_cnt >= 0 && dev_cnt < 127) 4431 detected_devices[dev_cnt++] = dev; 4432 } 4433 4434 4435 static void autostart_arrays(int part) 4436 { 4437 mdk_rdev_t *rdev; 4438 int i; 4439 4440 printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); 4441 4442 for (i = 0; i < dev_cnt; i++) { 4443 dev_t dev = detected_devices[i]; 4444 4445 rdev = md_import_device(dev,0, 0); 4446 if (IS_ERR(rdev)) 4447 continue; 4448 4449 if (test_bit(Faulty, &rdev->flags)) { 4450 MD_BUG(); 4451 continue; 4452 } 4453 list_add(&rdev->same_set, &pending_raid_disks); 4454 } 4455 dev_cnt = 0; 4456 4457 autorun_devices(part); 4458 } 4459 4460 #endif 4461 4462 static __exit void md_exit(void) 4463 { 4464 mddev_t *mddev; 4465 struct list_head *tmp; 4466 int i; 4467 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); 4468 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); 4469 for (i=0; i < MAX_MD_DEVS; i++) 4470 devfs_remove("md/%d", i); 4471 for (i=0; i < MAX_MD_DEVS; i++) 4472 devfs_remove("md/d%d", i); 4473 4474 devfs_remove("md"); 4475 4476 unregister_blkdev(MAJOR_NR,"md"); 4477 unregister_blkdev(mdp_major, "mdp"); 4478 unregister_reboot_notifier(&md_notifier); 4479 unregister_sysctl_table(raid_table_header); 4480 remove_proc_entry("mdstat", NULL); 4481 ITERATE_MDDEV(mddev,tmp) { 4482 struct gendisk *disk = mddev->gendisk; 4483 if (!disk) 4484 continue; 4485 export_array(mddev); 4486 del_gendisk(disk); 4487 put_disk(disk); 4488 mddev->gendisk = NULL; 4489 mddev_put(mddev); 4490 } 4491 } 4492 4493 module_init(md_init) 4494 module_exit(md_exit) 4495 4496 static int get_ro(char *buffer, struct kernel_param *kp) 4497 { 4498 return sprintf(buffer, "%d", start_readonly); 4499 } 4500 static int set_ro(const char *val, struct kernel_param *kp) 4501 { 4502 char *e; 4503 int num = simple_strtoul(val, &e, 10); 4504 if (*val && (*e == '\0' || *e == '\n')) { 4505 start_readonly = num; 4506 return 0;; 4507 } 4508 return -EINVAL; 4509 } 4510 4511 module_param_call(start_ro, set_ro, get_ro, NULL, 0600); 4512 4513 EXPORT_SYMBOL(register_md_personality); 4514 EXPORT_SYMBOL(unregister_md_personality); 4515 EXPORT_SYMBOL(md_error); 4516 EXPORT_SYMBOL(md_done_sync); 4517 EXPORT_SYMBOL(md_write_start); 4518 EXPORT_SYMBOL(md_write_end); 4519 EXPORT_SYMBOL(md_register_thread); 4520 EXPORT_SYMBOL(md_unregister_thread); 4521 EXPORT_SYMBOL(md_wakeup_thread); 4522 EXPORT_SYMBOL(md_print_devices); 4523 EXPORT_SYMBOL(md_check_recovery); 4524 MODULE_LICENSE("GPL"); 4525 MODULE_ALIAS("md"); 4526 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 4527