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