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