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/kthread.h> 36 #include <linux/blkdev.h> 37 #include <linux/sysctl.h> 38 #include <linux/seq_file.h> 39 #include <linux/fs.h> 40 #include <linux/poll.h> 41 #include <linux/ctype.h> 42 #include <linux/string.h> 43 #include <linux/hdreg.h> 44 #include <linux/proc_fs.h> 45 #include <linux/random.h> 46 #include <linux/module.h> 47 #include <linux/reboot.h> 48 #include <linux/file.h> 49 #include <linux/compat.h> 50 #include <linux/delay.h> 51 #include <linux/raid/md_p.h> 52 #include <linux/raid/md_u.h> 53 #include <linux/slab.h> 54 #include "md.h" 55 #include "bitmap.h" 56 57 #ifndef MODULE 58 static void autostart_arrays(int part); 59 #endif 60 61 /* pers_list is a list of registered personalities protected 62 * by pers_lock. 63 * pers_lock does extra service to protect accesses to 64 * mddev->thread when the mutex cannot be held. 65 */ 66 static LIST_HEAD(pers_list); 67 static DEFINE_SPINLOCK(pers_lock); 68 69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 70 static struct workqueue_struct *md_wq; 71 static struct workqueue_struct *md_misc_wq; 72 73 static int remove_and_add_spares(struct mddev *mddev, 74 struct md_rdev *this); 75 76 /* 77 * Default number of read corrections we'll attempt on an rdev 78 * before ejecting it from the array. We divide the read error 79 * count by 2 for every hour elapsed between read errors. 80 */ 81 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 82 /* 83 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 84 * is 1000 KB/sec, so the extra system load does not show up that much. 85 * Increase it if you want to have more _guaranteed_ speed. Note that 86 * the RAID driver will use the maximum available bandwidth if the IO 87 * subsystem is idle. There is also an 'absolute maximum' reconstruction 88 * speed limit - in case reconstruction slows down your system despite 89 * idle IO detection. 90 * 91 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 92 * or /sys/block/mdX/md/sync_speed_{min,max} 93 */ 94 95 static int sysctl_speed_limit_min = 1000; 96 static int sysctl_speed_limit_max = 200000; 97 static inline int speed_min(struct mddev *mddev) 98 { 99 return mddev->sync_speed_min ? 100 mddev->sync_speed_min : sysctl_speed_limit_min; 101 } 102 103 static inline int speed_max(struct mddev *mddev) 104 { 105 return mddev->sync_speed_max ? 106 mddev->sync_speed_max : sysctl_speed_limit_max; 107 } 108 109 static struct ctl_table_header *raid_table_header; 110 111 static struct ctl_table raid_table[] = { 112 { 113 .procname = "speed_limit_min", 114 .data = &sysctl_speed_limit_min, 115 .maxlen = sizeof(int), 116 .mode = S_IRUGO|S_IWUSR, 117 .proc_handler = proc_dointvec, 118 }, 119 { 120 .procname = "speed_limit_max", 121 .data = &sysctl_speed_limit_max, 122 .maxlen = sizeof(int), 123 .mode = S_IRUGO|S_IWUSR, 124 .proc_handler = proc_dointvec, 125 }, 126 { } 127 }; 128 129 static struct ctl_table raid_dir_table[] = { 130 { 131 .procname = "raid", 132 .maxlen = 0, 133 .mode = S_IRUGO|S_IXUGO, 134 .child = raid_table, 135 }, 136 { } 137 }; 138 139 static struct ctl_table raid_root_table[] = { 140 { 141 .procname = "dev", 142 .maxlen = 0, 143 .mode = 0555, 144 .child = raid_dir_table, 145 }, 146 { } 147 }; 148 149 static const struct block_device_operations md_fops; 150 151 static int start_readonly; 152 153 /* bio_clone_mddev 154 * like bio_clone, but with a local bio set 155 */ 156 157 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, 158 struct mddev *mddev) 159 { 160 struct bio *b; 161 162 if (!mddev || !mddev->bio_set) 163 return bio_alloc(gfp_mask, nr_iovecs); 164 165 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); 166 if (!b) 167 return NULL; 168 return b; 169 } 170 EXPORT_SYMBOL_GPL(bio_alloc_mddev); 171 172 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, 173 struct mddev *mddev) 174 { 175 if (!mddev || !mddev->bio_set) 176 return bio_clone(bio, gfp_mask); 177 178 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); 179 } 180 EXPORT_SYMBOL_GPL(bio_clone_mddev); 181 182 /* 183 * We have a system wide 'event count' that is incremented 184 * on any 'interesting' event, and readers of /proc/mdstat 185 * can use 'poll' or 'select' to find out when the event 186 * count increases. 187 * 188 * Events are: 189 * start array, stop array, error, add device, remove device, 190 * start build, activate spare 191 */ 192 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); 193 static atomic_t md_event_count; 194 void md_new_event(struct mddev *mddev) 195 { 196 atomic_inc(&md_event_count); 197 wake_up(&md_event_waiters); 198 } 199 EXPORT_SYMBOL_GPL(md_new_event); 200 201 /* Alternate version that can be called from interrupts 202 * when calling sysfs_notify isn't needed. 203 */ 204 static void md_new_event_inintr(struct mddev *mddev) 205 { 206 atomic_inc(&md_event_count); 207 wake_up(&md_event_waiters); 208 } 209 210 /* 211 * Enables to iterate over all existing md arrays 212 * all_mddevs_lock protects this list. 213 */ 214 static LIST_HEAD(all_mddevs); 215 static DEFINE_SPINLOCK(all_mddevs_lock); 216 217 /* 218 * iterates through all used mddevs in the system. 219 * We take care to grab the all_mddevs_lock whenever navigating 220 * the list, and to always hold a refcount when unlocked. 221 * Any code which breaks out of this loop while own 222 * a reference to the current mddev and must mddev_put it. 223 */ 224 #define for_each_mddev(_mddev,_tmp) \ 225 \ 226 for (({ spin_lock(&all_mddevs_lock); \ 227 _tmp = all_mddevs.next; \ 228 _mddev = NULL;}); \ 229 ({ if (_tmp != &all_mddevs) \ 230 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ 231 spin_unlock(&all_mddevs_lock); \ 232 if (_mddev) mddev_put(_mddev); \ 233 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ 234 _tmp != &all_mddevs;}); \ 235 ({ spin_lock(&all_mddevs_lock); \ 236 _tmp = _tmp->next;}) \ 237 ) 238 239 /* Rather than calling directly into the personality make_request function, 240 * IO requests come here first so that we can check if the device is 241 * being suspended pending a reconfiguration. 242 * We hold a refcount over the call to ->make_request. By the time that 243 * call has finished, the bio has been linked into some internal structure 244 * and so is visible to ->quiesce(), so we don't need the refcount any more. 245 */ 246 static void md_make_request(struct request_queue *q, struct bio *bio) 247 { 248 const int rw = bio_data_dir(bio); 249 struct mddev *mddev = q->queuedata; 250 int cpu; 251 unsigned int sectors; 252 253 if (mddev == NULL || mddev->pers == NULL 254 || !mddev->ready) { 255 bio_io_error(bio); 256 return; 257 } 258 if (mddev->ro == 1 && unlikely(rw == WRITE)) { 259 bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); 260 return; 261 } 262 smp_rmb(); /* Ensure implications of 'active' are visible */ 263 rcu_read_lock(); 264 if (mddev->suspended) { 265 DEFINE_WAIT(__wait); 266 for (;;) { 267 prepare_to_wait(&mddev->sb_wait, &__wait, 268 TASK_UNINTERRUPTIBLE); 269 if (!mddev->suspended) 270 break; 271 rcu_read_unlock(); 272 schedule(); 273 rcu_read_lock(); 274 } 275 finish_wait(&mddev->sb_wait, &__wait); 276 } 277 atomic_inc(&mddev->active_io); 278 rcu_read_unlock(); 279 280 /* 281 * save the sectors now since our bio can 282 * go away inside make_request 283 */ 284 sectors = bio_sectors(bio); 285 mddev->pers->make_request(mddev, bio); 286 287 cpu = part_stat_lock(); 288 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); 289 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); 290 part_stat_unlock(); 291 292 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) 293 wake_up(&mddev->sb_wait); 294 } 295 296 /* mddev_suspend makes sure no new requests are submitted 297 * to the device, and that any requests that have been submitted 298 * are completely handled. 299 * Once ->stop is called and completes, the module will be completely 300 * unused. 301 */ 302 void mddev_suspend(struct mddev *mddev) 303 { 304 BUG_ON(mddev->suspended); 305 mddev->suspended = 1; 306 synchronize_rcu(); 307 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); 308 mddev->pers->quiesce(mddev, 1); 309 310 del_timer_sync(&mddev->safemode_timer); 311 } 312 EXPORT_SYMBOL_GPL(mddev_suspend); 313 314 void mddev_resume(struct mddev *mddev) 315 { 316 mddev->suspended = 0; 317 wake_up(&mddev->sb_wait); 318 mddev->pers->quiesce(mddev, 0); 319 320 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 321 md_wakeup_thread(mddev->thread); 322 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 323 } 324 EXPORT_SYMBOL_GPL(mddev_resume); 325 326 int mddev_congested(struct mddev *mddev, int bits) 327 { 328 return mddev->suspended; 329 } 330 EXPORT_SYMBOL(mddev_congested); 331 332 /* 333 * Generic flush handling for md 334 */ 335 336 static void md_end_flush(struct bio *bio, int err) 337 { 338 struct md_rdev *rdev = bio->bi_private; 339 struct mddev *mddev = rdev->mddev; 340 341 rdev_dec_pending(rdev, mddev); 342 343 if (atomic_dec_and_test(&mddev->flush_pending)) { 344 /* The pre-request flush has finished */ 345 queue_work(md_wq, &mddev->flush_work); 346 } 347 bio_put(bio); 348 } 349 350 static void md_submit_flush_data(struct work_struct *ws); 351 352 static void submit_flushes(struct work_struct *ws) 353 { 354 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 355 struct md_rdev *rdev; 356 357 INIT_WORK(&mddev->flush_work, md_submit_flush_data); 358 atomic_set(&mddev->flush_pending, 1); 359 rcu_read_lock(); 360 rdev_for_each_rcu(rdev, mddev) 361 if (rdev->raid_disk >= 0 && 362 !test_bit(Faulty, &rdev->flags)) { 363 /* Take two references, one is dropped 364 * when request finishes, one after 365 * we reclaim rcu_read_lock 366 */ 367 struct bio *bi; 368 atomic_inc(&rdev->nr_pending); 369 atomic_inc(&rdev->nr_pending); 370 rcu_read_unlock(); 371 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); 372 bi->bi_end_io = md_end_flush; 373 bi->bi_private = rdev; 374 bi->bi_bdev = rdev->bdev; 375 atomic_inc(&mddev->flush_pending); 376 submit_bio(WRITE_FLUSH, bi); 377 rcu_read_lock(); 378 rdev_dec_pending(rdev, mddev); 379 } 380 rcu_read_unlock(); 381 if (atomic_dec_and_test(&mddev->flush_pending)) 382 queue_work(md_wq, &mddev->flush_work); 383 } 384 385 static void md_submit_flush_data(struct work_struct *ws) 386 { 387 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 388 struct bio *bio = mddev->flush_bio; 389 390 if (bio->bi_iter.bi_size == 0) 391 /* an empty barrier - all done */ 392 bio_endio(bio, 0); 393 else { 394 bio->bi_rw &= ~REQ_FLUSH; 395 mddev->pers->make_request(mddev, bio); 396 } 397 398 mddev->flush_bio = NULL; 399 wake_up(&mddev->sb_wait); 400 } 401 402 void md_flush_request(struct mddev *mddev, struct bio *bio) 403 { 404 spin_lock_irq(&mddev->write_lock); 405 wait_event_lock_irq(mddev->sb_wait, 406 !mddev->flush_bio, 407 mddev->write_lock); 408 mddev->flush_bio = bio; 409 spin_unlock_irq(&mddev->write_lock); 410 411 INIT_WORK(&mddev->flush_work, submit_flushes); 412 queue_work(md_wq, &mddev->flush_work); 413 } 414 EXPORT_SYMBOL(md_flush_request); 415 416 void md_unplug(struct blk_plug_cb *cb, bool from_schedule) 417 { 418 struct mddev *mddev = cb->data; 419 md_wakeup_thread(mddev->thread); 420 kfree(cb); 421 } 422 EXPORT_SYMBOL(md_unplug); 423 424 static inline struct mddev *mddev_get(struct mddev *mddev) 425 { 426 atomic_inc(&mddev->active); 427 return mddev; 428 } 429 430 static void mddev_delayed_delete(struct work_struct *ws); 431 432 static void mddev_put(struct mddev *mddev) 433 { 434 struct bio_set *bs = NULL; 435 436 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 437 return; 438 if (!mddev->raid_disks && list_empty(&mddev->disks) && 439 mddev->ctime == 0 && !mddev->hold_active) { 440 /* Array is not configured at all, and not held active, 441 * so destroy it */ 442 list_del_init(&mddev->all_mddevs); 443 bs = mddev->bio_set; 444 mddev->bio_set = NULL; 445 if (mddev->gendisk) { 446 /* We did a probe so need to clean up. Call 447 * queue_work inside the spinlock so that 448 * flush_workqueue() after mddev_find will 449 * succeed in waiting for the work to be done. 450 */ 451 INIT_WORK(&mddev->del_work, mddev_delayed_delete); 452 queue_work(md_misc_wq, &mddev->del_work); 453 } else 454 kfree(mddev); 455 } 456 spin_unlock(&all_mddevs_lock); 457 if (bs) 458 bioset_free(bs); 459 } 460 461 void mddev_init(struct mddev *mddev) 462 { 463 mutex_init(&mddev->open_mutex); 464 mutex_init(&mddev->reconfig_mutex); 465 mutex_init(&mddev->bitmap_info.mutex); 466 INIT_LIST_HEAD(&mddev->disks); 467 INIT_LIST_HEAD(&mddev->all_mddevs); 468 init_timer(&mddev->safemode_timer); 469 atomic_set(&mddev->active, 1); 470 atomic_set(&mddev->openers, 0); 471 atomic_set(&mddev->active_io, 0); 472 spin_lock_init(&mddev->write_lock); 473 atomic_set(&mddev->flush_pending, 0); 474 init_waitqueue_head(&mddev->sb_wait); 475 init_waitqueue_head(&mddev->recovery_wait); 476 mddev->reshape_position = MaxSector; 477 mddev->reshape_backwards = 0; 478 mddev->last_sync_action = "none"; 479 mddev->resync_min = 0; 480 mddev->resync_max = MaxSector; 481 mddev->level = LEVEL_NONE; 482 } 483 EXPORT_SYMBOL_GPL(mddev_init); 484 485 static struct mddev *mddev_find(dev_t unit) 486 { 487 struct mddev *mddev, *new = NULL; 488 489 if (unit && MAJOR(unit) != MD_MAJOR) 490 unit &= ~((1<<MdpMinorShift)-1); 491 492 retry: 493 spin_lock(&all_mddevs_lock); 494 495 if (unit) { 496 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 497 if (mddev->unit == unit) { 498 mddev_get(mddev); 499 spin_unlock(&all_mddevs_lock); 500 kfree(new); 501 return mddev; 502 } 503 504 if (new) { 505 list_add(&new->all_mddevs, &all_mddevs); 506 spin_unlock(&all_mddevs_lock); 507 new->hold_active = UNTIL_IOCTL; 508 return new; 509 } 510 } else if (new) { 511 /* find an unused unit number */ 512 static int next_minor = 512; 513 int start = next_minor; 514 int is_free = 0; 515 int dev = 0; 516 while (!is_free) { 517 dev = MKDEV(MD_MAJOR, next_minor); 518 next_minor++; 519 if (next_minor > MINORMASK) 520 next_minor = 0; 521 if (next_minor == start) { 522 /* Oh dear, all in use. */ 523 spin_unlock(&all_mddevs_lock); 524 kfree(new); 525 return NULL; 526 } 527 528 is_free = 1; 529 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 530 if (mddev->unit == dev) { 531 is_free = 0; 532 break; 533 } 534 } 535 new->unit = dev; 536 new->md_minor = MINOR(dev); 537 new->hold_active = UNTIL_STOP; 538 list_add(&new->all_mddevs, &all_mddevs); 539 spin_unlock(&all_mddevs_lock); 540 return new; 541 } 542 spin_unlock(&all_mddevs_lock); 543 544 new = kzalloc(sizeof(*new), GFP_KERNEL); 545 if (!new) 546 return NULL; 547 548 new->unit = unit; 549 if (MAJOR(unit) == MD_MAJOR) 550 new->md_minor = MINOR(unit); 551 else 552 new->md_minor = MINOR(unit) >> MdpMinorShift; 553 554 mddev_init(new); 555 556 goto retry; 557 } 558 559 static inline int __must_check mddev_lock(struct mddev *mddev) 560 { 561 return mutex_lock_interruptible(&mddev->reconfig_mutex); 562 } 563 564 /* Sometimes we need to take the lock in a situation where 565 * failure due to interrupts is not acceptable. 566 */ 567 static inline void mddev_lock_nointr(struct mddev *mddev) 568 { 569 mutex_lock(&mddev->reconfig_mutex); 570 } 571 572 static inline int mddev_is_locked(struct mddev *mddev) 573 { 574 return mutex_is_locked(&mddev->reconfig_mutex); 575 } 576 577 static inline int mddev_trylock(struct mddev *mddev) 578 { 579 return mutex_trylock(&mddev->reconfig_mutex); 580 } 581 582 static struct attribute_group md_redundancy_group; 583 584 static void mddev_unlock(struct mddev *mddev) 585 { 586 if (mddev->to_remove) { 587 /* These cannot be removed under reconfig_mutex as 588 * an access to the files will try to take reconfig_mutex 589 * while holding the file unremovable, which leads to 590 * a deadlock. 591 * So hold set sysfs_active while the remove in happeing, 592 * and anything else which might set ->to_remove or my 593 * otherwise change the sysfs namespace will fail with 594 * -EBUSY if sysfs_active is still set. 595 * We set sysfs_active under reconfig_mutex and elsewhere 596 * test it under the same mutex to ensure its correct value 597 * is seen. 598 */ 599 struct attribute_group *to_remove = mddev->to_remove; 600 mddev->to_remove = NULL; 601 mddev->sysfs_active = 1; 602 mutex_unlock(&mddev->reconfig_mutex); 603 604 if (mddev->kobj.sd) { 605 if (to_remove != &md_redundancy_group) 606 sysfs_remove_group(&mddev->kobj, to_remove); 607 if (mddev->pers == NULL || 608 mddev->pers->sync_request == NULL) { 609 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 610 if (mddev->sysfs_action) 611 sysfs_put(mddev->sysfs_action); 612 mddev->sysfs_action = NULL; 613 } 614 } 615 mddev->sysfs_active = 0; 616 } else 617 mutex_unlock(&mddev->reconfig_mutex); 618 619 /* As we've dropped the mutex we need a spinlock to 620 * make sure the thread doesn't disappear 621 */ 622 spin_lock(&pers_lock); 623 md_wakeup_thread(mddev->thread); 624 spin_unlock(&pers_lock); 625 } 626 627 static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) 628 { 629 struct md_rdev *rdev; 630 631 rdev_for_each_rcu(rdev, mddev) 632 if (rdev->desc_nr == nr) 633 return rdev; 634 635 return NULL; 636 } 637 638 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) 639 { 640 struct md_rdev *rdev; 641 642 rdev_for_each(rdev, mddev) 643 if (rdev->bdev->bd_dev == dev) 644 return rdev; 645 646 return NULL; 647 } 648 649 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) 650 { 651 struct md_rdev *rdev; 652 653 rdev_for_each_rcu(rdev, mddev) 654 if (rdev->bdev->bd_dev == dev) 655 return rdev; 656 657 return NULL; 658 } 659 660 static struct md_personality *find_pers(int level, char *clevel) 661 { 662 struct md_personality *pers; 663 list_for_each_entry(pers, &pers_list, list) { 664 if (level != LEVEL_NONE && pers->level == level) 665 return pers; 666 if (strcmp(pers->name, clevel)==0) 667 return pers; 668 } 669 return NULL; 670 } 671 672 /* return the offset of the super block in 512byte sectors */ 673 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) 674 { 675 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; 676 return MD_NEW_SIZE_SECTORS(num_sectors); 677 } 678 679 static int alloc_disk_sb(struct md_rdev *rdev) 680 { 681 rdev->sb_page = alloc_page(GFP_KERNEL); 682 if (!rdev->sb_page) { 683 printk(KERN_ALERT "md: out of memory.\n"); 684 return -ENOMEM; 685 } 686 687 return 0; 688 } 689 690 void md_rdev_clear(struct md_rdev *rdev) 691 { 692 if (rdev->sb_page) { 693 put_page(rdev->sb_page); 694 rdev->sb_loaded = 0; 695 rdev->sb_page = NULL; 696 rdev->sb_start = 0; 697 rdev->sectors = 0; 698 } 699 if (rdev->bb_page) { 700 put_page(rdev->bb_page); 701 rdev->bb_page = NULL; 702 } 703 kfree(rdev->badblocks.page); 704 rdev->badblocks.page = NULL; 705 } 706 EXPORT_SYMBOL_GPL(md_rdev_clear); 707 708 static void super_written(struct bio *bio, int error) 709 { 710 struct md_rdev *rdev = bio->bi_private; 711 struct mddev *mddev = rdev->mddev; 712 713 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { 714 printk("md: super_written gets error=%d, uptodate=%d\n", 715 error, test_bit(BIO_UPTODATE, &bio->bi_flags)); 716 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); 717 md_error(mddev, rdev); 718 } 719 720 if (atomic_dec_and_test(&mddev->pending_writes)) 721 wake_up(&mddev->sb_wait); 722 bio_put(bio); 723 } 724 725 void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 726 sector_t sector, int size, struct page *page) 727 { 728 /* write first size bytes of page to sector of rdev 729 * Increment mddev->pending_writes before returning 730 * and decrement it on completion, waking up sb_wait 731 * if zero is reached. 732 * If an error occurred, call md_error 733 */ 734 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); 735 736 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; 737 bio->bi_iter.bi_sector = sector; 738 bio_add_page(bio, page, size, 0); 739 bio->bi_private = rdev; 740 bio->bi_end_io = super_written; 741 742 atomic_inc(&mddev->pending_writes); 743 submit_bio(WRITE_FLUSH_FUA, bio); 744 } 745 746 void md_super_wait(struct mddev *mddev) 747 { 748 /* wait for all superblock writes that were scheduled to complete */ 749 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); 750 } 751 752 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 753 struct page *page, int rw, bool metadata_op) 754 { 755 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); 756 int ret; 757 758 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? 759 rdev->meta_bdev : rdev->bdev; 760 if (metadata_op) 761 bio->bi_iter.bi_sector = sector + rdev->sb_start; 762 else if (rdev->mddev->reshape_position != MaxSector && 763 (rdev->mddev->reshape_backwards == 764 (sector >= rdev->mddev->reshape_position))) 765 bio->bi_iter.bi_sector = sector + rdev->new_data_offset; 766 else 767 bio->bi_iter.bi_sector = sector + rdev->data_offset; 768 bio_add_page(bio, page, size, 0); 769 submit_bio_wait(rw, bio); 770 771 ret = test_bit(BIO_UPTODATE, &bio->bi_flags); 772 bio_put(bio); 773 return ret; 774 } 775 EXPORT_SYMBOL_GPL(sync_page_io); 776 777 static int read_disk_sb(struct md_rdev *rdev, int size) 778 { 779 char b[BDEVNAME_SIZE]; 780 781 if (rdev->sb_loaded) 782 return 0; 783 784 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) 785 goto fail; 786 rdev->sb_loaded = 1; 787 return 0; 788 789 fail: 790 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", 791 bdevname(rdev->bdev,b)); 792 return -EINVAL; 793 } 794 795 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 796 { 797 return sb1->set_uuid0 == sb2->set_uuid0 && 798 sb1->set_uuid1 == sb2->set_uuid1 && 799 sb1->set_uuid2 == sb2->set_uuid2 && 800 sb1->set_uuid3 == sb2->set_uuid3; 801 } 802 803 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 804 { 805 int ret; 806 mdp_super_t *tmp1, *tmp2; 807 808 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 809 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 810 811 if (!tmp1 || !tmp2) { 812 ret = 0; 813 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); 814 goto abort; 815 } 816 817 *tmp1 = *sb1; 818 *tmp2 = *sb2; 819 820 /* 821 * nr_disks is not constant 822 */ 823 tmp1->nr_disks = 0; 824 tmp2->nr_disks = 0; 825 826 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); 827 abort: 828 kfree(tmp1); 829 kfree(tmp2); 830 return ret; 831 } 832 833 static u32 md_csum_fold(u32 csum) 834 { 835 csum = (csum & 0xffff) + (csum >> 16); 836 return (csum & 0xffff) + (csum >> 16); 837 } 838 839 static unsigned int calc_sb_csum(mdp_super_t *sb) 840 { 841 u64 newcsum = 0; 842 u32 *sb32 = (u32*)sb; 843 int i; 844 unsigned int disk_csum, csum; 845 846 disk_csum = sb->sb_csum; 847 sb->sb_csum = 0; 848 849 for (i = 0; i < MD_SB_BYTES/4 ; i++) 850 newcsum += sb32[i]; 851 csum = (newcsum & 0xffffffff) + (newcsum>>32); 852 853 #ifdef CONFIG_ALPHA 854 /* This used to use csum_partial, which was wrong for several 855 * reasons including that different results are returned on 856 * different architectures. It isn't critical that we get exactly 857 * the same return value as before (we always csum_fold before 858 * testing, and that removes any differences). However as we 859 * know that csum_partial always returned a 16bit value on 860 * alphas, do a fold to maximise conformity to previous behaviour. 861 */ 862 sb->sb_csum = md_csum_fold(disk_csum); 863 #else 864 sb->sb_csum = disk_csum; 865 #endif 866 return csum; 867 } 868 869 /* 870 * Handle superblock details. 871 * We want to be able to handle multiple superblock formats 872 * so we have a common interface to them all, and an array of 873 * different handlers. 874 * We rely on user-space to write the initial superblock, and support 875 * reading and updating of superblocks. 876 * Interface methods are: 877 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) 878 * loads and validates a superblock on dev. 879 * if refdev != NULL, compare superblocks on both devices 880 * Return: 881 * 0 - dev has a superblock that is compatible with refdev 882 * 1 - dev has a superblock that is compatible and newer than refdev 883 * so dev should be used as the refdev in future 884 * -EINVAL superblock incompatible or invalid 885 * -othererror e.g. -EIO 886 * 887 * int validate_super(struct mddev *mddev, struct md_rdev *dev) 888 * Verify that dev is acceptable into mddev. 889 * The first time, mddev->raid_disks will be 0, and data from 890 * dev should be merged in. Subsequent calls check that dev 891 * is new enough. Return 0 or -EINVAL 892 * 893 * void sync_super(struct mddev *mddev, struct md_rdev *dev) 894 * Update the superblock for rdev with data in mddev 895 * This does not write to disc. 896 * 897 */ 898 899 struct super_type { 900 char *name; 901 struct module *owner; 902 int (*load_super)(struct md_rdev *rdev, 903 struct md_rdev *refdev, 904 int minor_version); 905 int (*validate_super)(struct mddev *mddev, 906 struct md_rdev *rdev); 907 void (*sync_super)(struct mddev *mddev, 908 struct md_rdev *rdev); 909 unsigned long long (*rdev_size_change)(struct md_rdev *rdev, 910 sector_t num_sectors); 911 int (*allow_new_offset)(struct md_rdev *rdev, 912 unsigned long long new_offset); 913 }; 914 915 /* 916 * Check that the given mddev has no bitmap. 917 * 918 * This function is called from the run method of all personalities that do not 919 * support bitmaps. It prints an error message and returns non-zero if mddev 920 * has a bitmap. Otherwise, it returns 0. 921 * 922 */ 923 int md_check_no_bitmap(struct mddev *mddev) 924 { 925 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) 926 return 0; 927 printk(KERN_ERR "%s: bitmaps are not supported for %s\n", 928 mdname(mddev), mddev->pers->name); 929 return 1; 930 } 931 EXPORT_SYMBOL(md_check_no_bitmap); 932 933 /* 934 * load_super for 0.90.0 935 */ 936 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 937 { 938 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 939 mdp_super_t *sb; 940 int ret; 941 942 /* 943 * Calculate the position of the superblock (512byte sectors), 944 * it's at the end of the disk. 945 * 946 * It also happens to be a multiple of 4Kb. 947 */ 948 rdev->sb_start = calc_dev_sboffset(rdev); 949 950 ret = read_disk_sb(rdev, MD_SB_BYTES); 951 if (ret) return ret; 952 953 ret = -EINVAL; 954 955 bdevname(rdev->bdev, b); 956 sb = page_address(rdev->sb_page); 957 958 if (sb->md_magic != MD_SB_MAGIC) { 959 printk(KERN_ERR "md: invalid raid superblock magic on %s\n", 960 b); 961 goto abort; 962 } 963 964 if (sb->major_version != 0 || 965 sb->minor_version < 90 || 966 sb->minor_version > 91) { 967 printk(KERN_WARNING "Bad version number %d.%d on %s\n", 968 sb->major_version, sb->minor_version, 969 b); 970 goto abort; 971 } 972 973 if (sb->raid_disks <= 0) 974 goto abort; 975 976 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { 977 printk(KERN_WARNING "md: invalid superblock checksum on %s\n", 978 b); 979 goto abort; 980 } 981 982 rdev->preferred_minor = sb->md_minor; 983 rdev->data_offset = 0; 984 rdev->new_data_offset = 0; 985 rdev->sb_size = MD_SB_BYTES; 986 rdev->badblocks.shift = -1; 987 988 if (sb->level == LEVEL_MULTIPATH) 989 rdev->desc_nr = -1; 990 else 991 rdev->desc_nr = sb->this_disk.number; 992 993 if (!refdev) { 994 ret = 1; 995 } else { 996 __u64 ev1, ev2; 997 mdp_super_t *refsb = page_address(refdev->sb_page); 998 if (!uuid_equal(refsb, sb)) { 999 printk(KERN_WARNING "md: %s has different UUID to %s\n", 1000 b, bdevname(refdev->bdev,b2)); 1001 goto abort; 1002 } 1003 if (!sb_equal(refsb, sb)) { 1004 printk(KERN_WARNING "md: %s has same UUID" 1005 " but different superblock to %s\n", 1006 b, bdevname(refdev->bdev, b2)); 1007 goto abort; 1008 } 1009 ev1 = md_event(sb); 1010 ev2 = md_event(refsb); 1011 if (ev1 > ev2) 1012 ret = 1; 1013 else 1014 ret = 0; 1015 } 1016 rdev->sectors = rdev->sb_start; 1017 /* Limit to 4TB as metadata cannot record more than that. 1018 * (not needed for Linear and RAID0 as metadata doesn't 1019 * record this size) 1020 */ 1021 if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) 1022 rdev->sectors = (2ULL << 32) - 2; 1023 1024 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) 1025 /* "this cannot possibly happen" ... */ 1026 ret = -EINVAL; 1027 1028 abort: 1029 return ret; 1030 } 1031 1032 /* 1033 * validate_super for 0.90.0 1034 */ 1035 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) 1036 { 1037 mdp_disk_t *desc; 1038 mdp_super_t *sb = page_address(rdev->sb_page); 1039 __u64 ev1 = md_event(sb); 1040 1041 rdev->raid_disk = -1; 1042 clear_bit(Faulty, &rdev->flags); 1043 clear_bit(In_sync, &rdev->flags); 1044 clear_bit(Bitmap_sync, &rdev->flags); 1045 clear_bit(WriteMostly, &rdev->flags); 1046 1047 if (mddev->raid_disks == 0) { 1048 mddev->major_version = 0; 1049 mddev->minor_version = sb->minor_version; 1050 mddev->patch_version = sb->patch_version; 1051 mddev->external = 0; 1052 mddev->chunk_sectors = sb->chunk_size >> 9; 1053 mddev->ctime = sb->ctime; 1054 mddev->utime = sb->utime; 1055 mddev->level = sb->level; 1056 mddev->clevel[0] = 0; 1057 mddev->layout = sb->layout; 1058 mddev->raid_disks = sb->raid_disks; 1059 mddev->dev_sectors = ((sector_t)sb->size) * 2; 1060 mddev->events = ev1; 1061 mddev->bitmap_info.offset = 0; 1062 mddev->bitmap_info.space = 0; 1063 /* bitmap can use 60 K after the 4K superblocks */ 1064 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 1065 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); 1066 mddev->reshape_backwards = 0; 1067 1068 if (mddev->minor_version >= 91) { 1069 mddev->reshape_position = sb->reshape_position; 1070 mddev->delta_disks = sb->delta_disks; 1071 mddev->new_level = sb->new_level; 1072 mddev->new_layout = sb->new_layout; 1073 mddev->new_chunk_sectors = sb->new_chunk >> 9; 1074 if (mddev->delta_disks < 0) 1075 mddev->reshape_backwards = 1; 1076 } else { 1077 mddev->reshape_position = MaxSector; 1078 mddev->delta_disks = 0; 1079 mddev->new_level = mddev->level; 1080 mddev->new_layout = mddev->layout; 1081 mddev->new_chunk_sectors = mddev->chunk_sectors; 1082 } 1083 1084 if (sb->state & (1<<MD_SB_CLEAN)) 1085 mddev->recovery_cp = MaxSector; 1086 else { 1087 if (sb->events_hi == sb->cp_events_hi && 1088 sb->events_lo == sb->cp_events_lo) { 1089 mddev->recovery_cp = sb->recovery_cp; 1090 } else 1091 mddev->recovery_cp = 0; 1092 } 1093 1094 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 1095 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 1096 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 1097 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 1098 1099 mddev->max_disks = MD_SB_DISKS; 1100 1101 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 1102 mddev->bitmap_info.file == NULL) { 1103 mddev->bitmap_info.offset = 1104 mddev->bitmap_info.default_offset; 1105 mddev->bitmap_info.space = 1106 mddev->bitmap_info.default_space; 1107 } 1108 1109 } else if (mddev->pers == NULL) { 1110 /* Insist on good event counter while assembling, except 1111 * for spares (which don't need an event count) */ 1112 ++ev1; 1113 if (sb->disks[rdev->desc_nr].state & ( 1114 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) 1115 if (ev1 < mddev->events) 1116 return -EINVAL; 1117 } else if (mddev->bitmap) { 1118 /* if adding to array with a bitmap, then we can accept an 1119 * older device ... but not too old. 1120 */ 1121 if (ev1 < mddev->bitmap->events_cleared) 1122 return 0; 1123 if (ev1 < mddev->events) 1124 set_bit(Bitmap_sync, &rdev->flags); 1125 } else { 1126 if (ev1 < mddev->events) 1127 /* just a hot-add of a new device, leave raid_disk at -1 */ 1128 return 0; 1129 } 1130 1131 if (mddev->level != LEVEL_MULTIPATH) { 1132 desc = sb->disks + rdev->desc_nr; 1133 1134 if (desc->state & (1<<MD_DISK_FAULTY)) 1135 set_bit(Faulty, &rdev->flags); 1136 else if (desc->state & (1<<MD_DISK_SYNC) /* && 1137 desc->raid_disk < mddev->raid_disks */) { 1138 set_bit(In_sync, &rdev->flags); 1139 rdev->raid_disk = desc->raid_disk; 1140 rdev->saved_raid_disk = desc->raid_disk; 1141 } else if (desc->state & (1<<MD_DISK_ACTIVE)) { 1142 /* active but not in sync implies recovery up to 1143 * reshape position. We don't know exactly where 1144 * that is, so set to zero for now */ 1145 if (mddev->minor_version >= 91) { 1146 rdev->recovery_offset = 0; 1147 rdev->raid_disk = desc->raid_disk; 1148 } 1149 } 1150 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 1151 set_bit(WriteMostly, &rdev->flags); 1152 } else /* MULTIPATH are always insync */ 1153 set_bit(In_sync, &rdev->flags); 1154 return 0; 1155 } 1156 1157 /* 1158 * sync_super for 0.90.0 1159 */ 1160 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) 1161 { 1162 mdp_super_t *sb; 1163 struct md_rdev *rdev2; 1164 int next_spare = mddev->raid_disks; 1165 1166 /* make rdev->sb match mddev data.. 1167 * 1168 * 1/ zero out disks 1169 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 1170 * 3/ any empty disks < next_spare become removed 1171 * 1172 * disks[0] gets initialised to REMOVED because 1173 * we cannot be sure from other fields if it has 1174 * been initialised or not. 1175 */ 1176 int i; 1177 int active=0, working=0,failed=0,spare=0,nr_disks=0; 1178 1179 rdev->sb_size = MD_SB_BYTES; 1180 1181 sb = page_address(rdev->sb_page); 1182 1183 memset(sb, 0, sizeof(*sb)); 1184 1185 sb->md_magic = MD_SB_MAGIC; 1186 sb->major_version = mddev->major_version; 1187 sb->patch_version = mddev->patch_version; 1188 sb->gvalid_words = 0; /* ignored */ 1189 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 1190 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 1191 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 1192 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 1193 1194 sb->ctime = mddev->ctime; 1195 sb->level = mddev->level; 1196 sb->size = mddev->dev_sectors / 2; 1197 sb->raid_disks = mddev->raid_disks; 1198 sb->md_minor = mddev->md_minor; 1199 sb->not_persistent = 0; 1200 sb->utime = mddev->utime; 1201 sb->state = 0; 1202 sb->events_hi = (mddev->events>>32); 1203 sb->events_lo = (u32)mddev->events; 1204 1205 if (mddev->reshape_position == MaxSector) 1206 sb->minor_version = 90; 1207 else { 1208 sb->minor_version = 91; 1209 sb->reshape_position = mddev->reshape_position; 1210 sb->new_level = mddev->new_level; 1211 sb->delta_disks = mddev->delta_disks; 1212 sb->new_layout = mddev->new_layout; 1213 sb->new_chunk = mddev->new_chunk_sectors << 9; 1214 } 1215 mddev->minor_version = sb->minor_version; 1216 if (mddev->in_sync) 1217 { 1218 sb->recovery_cp = mddev->recovery_cp; 1219 sb->cp_events_hi = (mddev->events>>32); 1220 sb->cp_events_lo = (u32)mddev->events; 1221 if (mddev->recovery_cp == MaxSector) 1222 sb->state = (1<< MD_SB_CLEAN); 1223 } else 1224 sb->recovery_cp = 0; 1225 1226 sb->layout = mddev->layout; 1227 sb->chunk_size = mddev->chunk_sectors << 9; 1228 1229 if (mddev->bitmap && mddev->bitmap_info.file == NULL) 1230 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 1231 1232 sb->disks[0].state = (1<<MD_DISK_REMOVED); 1233 rdev_for_each(rdev2, mddev) { 1234 mdp_disk_t *d; 1235 int desc_nr; 1236 int is_active = test_bit(In_sync, &rdev2->flags); 1237 1238 if (rdev2->raid_disk >= 0 && 1239 sb->minor_version >= 91) 1240 /* we have nowhere to store the recovery_offset, 1241 * but if it is not below the reshape_position, 1242 * we can piggy-back on that. 1243 */ 1244 is_active = 1; 1245 if (rdev2->raid_disk < 0 || 1246 test_bit(Faulty, &rdev2->flags)) 1247 is_active = 0; 1248 if (is_active) 1249 desc_nr = rdev2->raid_disk; 1250 else 1251 desc_nr = next_spare++; 1252 rdev2->desc_nr = desc_nr; 1253 d = &sb->disks[rdev2->desc_nr]; 1254 nr_disks++; 1255 d->number = rdev2->desc_nr; 1256 d->major = MAJOR(rdev2->bdev->bd_dev); 1257 d->minor = MINOR(rdev2->bdev->bd_dev); 1258 if (is_active) 1259 d->raid_disk = rdev2->raid_disk; 1260 else 1261 d->raid_disk = rdev2->desc_nr; /* compatibility */ 1262 if (test_bit(Faulty, &rdev2->flags)) 1263 d->state = (1<<MD_DISK_FAULTY); 1264 else if (is_active) { 1265 d->state = (1<<MD_DISK_ACTIVE); 1266 if (test_bit(In_sync, &rdev2->flags)) 1267 d->state |= (1<<MD_DISK_SYNC); 1268 active++; 1269 working++; 1270 } else { 1271 d->state = 0; 1272 spare++; 1273 working++; 1274 } 1275 if (test_bit(WriteMostly, &rdev2->flags)) 1276 d->state |= (1<<MD_DISK_WRITEMOSTLY); 1277 } 1278 /* now set the "removed" and "faulty" bits on any missing devices */ 1279 for (i=0 ; i < mddev->raid_disks ; i++) { 1280 mdp_disk_t *d = &sb->disks[i]; 1281 if (d->state == 0 && d->number == 0) { 1282 d->number = i; 1283 d->raid_disk = i; 1284 d->state = (1<<MD_DISK_REMOVED); 1285 d->state |= (1<<MD_DISK_FAULTY); 1286 failed++; 1287 } 1288 } 1289 sb->nr_disks = nr_disks; 1290 sb->active_disks = active; 1291 sb->working_disks = working; 1292 sb->failed_disks = failed; 1293 sb->spare_disks = spare; 1294 1295 sb->this_disk = sb->disks[rdev->desc_nr]; 1296 sb->sb_csum = calc_sb_csum(sb); 1297 } 1298 1299 /* 1300 * rdev_size_change for 0.90.0 1301 */ 1302 static unsigned long long 1303 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1304 { 1305 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1306 return 0; /* component must fit device */ 1307 if (rdev->mddev->bitmap_info.offset) 1308 return 0; /* can't move bitmap */ 1309 rdev->sb_start = calc_dev_sboffset(rdev); 1310 if (!num_sectors || num_sectors > rdev->sb_start) 1311 num_sectors = rdev->sb_start; 1312 /* Limit to 4TB as metadata cannot record more than that. 1313 * 4TB == 2^32 KB, or 2*2^32 sectors. 1314 */ 1315 if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) 1316 num_sectors = (2ULL << 32) - 2; 1317 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1318 rdev->sb_page); 1319 md_super_wait(rdev->mddev); 1320 return num_sectors; 1321 } 1322 1323 static int 1324 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) 1325 { 1326 /* non-zero offset changes not possible with v0.90 */ 1327 return new_offset == 0; 1328 } 1329 1330 /* 1331 * version 1 superblock 1332 */ 1333 1334 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) 1335 { 1336 __le32 disk_csum; 1337 u32 csum; 1338 unsigned long long newcsum; 1339 int size = 256 + le32_to_cpu(sb->max_dev)*2; 1340 __le32 *isuper = (__le32*)sb; 1341 1342 disk_csum = sb->sb_csum; 1343 sb->sb_csum = 0; 1344 newcsum = 0; 1345 for (; size >= 4; size -= 4) 1346 newcsum += le32_to_cpu(*isuper++); 1347 1348 if (size == 2) 1349 newcsum += le16_to_cpu(*(__le16*) isuper); 1350 1351 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 1352 sb->sb_csum = disk_csum; 1353 return cpu_to_le32(csum); 1354 } 1355 1356 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, 1357 int acknowledged); 1358 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 1359 { 1360 struct mdp_superblock_1 *sb; 1361 int ret; 1362 sector_t sb_start; 1363 sector_t sectors; 1364 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1365 int bmask; 1366 1367 /* 1368 * Calculate the position of the superblock in 512byte sectors. 1369 * It is always aligned to a 4K boundary and 1370 * depeding on minor_version, it can be: 1371 * 0: At least 8K, but less than 12K, from end of device 1372 * 1: At start of device 1373 * 2: 4K from start of device. 1374 */ 1375 switch(minor_version) { 1376 case 0: 1377 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; 1378 sb_start -= 8*2; 1379 sb_start &= ~(sector_t)(4*2-1); 1380 break; 1381 case 1: 1382 sb_start = 0; 1383 break; 1384 case 2: 1385 sb_start = 8; 1386 break; 1387 default: 1388 return -EINVAL; 1389 } 1390 rdev->sb_start = sb_start; 1391 1392 /* superblock is rarely larger than 1K, but it can be larger, 1393 * and it is safe to read 4k, so we do that 1394 */ 1395 ret = read_disk_sb(rdev, 4096); 1396 if (ret) return ret; 1397 1398 sb = page_address(rdev->sb_page); 1399 1400 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 1401 sb->major_version != cpu_to_le32(1) || 1402 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 1403 le64_to_cpu(sb->super_offset) != rdev->sb_start || 1404 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 1405 return -EINVAL; 1406 1407 if (calc_sb_1_csum(sb) != sb->sb_csum) { 1408 printk("md: invalid superblock checksum on %s\n", 1409 bdevname(rdev->bdev,b)); 1410 return -EINVAL; 1411 } 1412 if (le64_to_cpu(sb->data_size) < 10) { 1413 printk("md: data_size too small on %s\n", 1414 bdevname(rdev->bdev,b)); 1415 return -EINVAL; 1416 } 1417 if (sb->pad0 || 1418 sb->pad3[0] || 1419 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) 1420 /* Some padding is non-zero, might be a new feature */ 1421 return -EINVAL; 1422 1423 rdev->preferred_minor = 0xffff; 1424 rdev->data_offset = le64_to_cpu(sb->data_offset); 1425 rdev->new_data_offset = rdev->data_offset; 1426 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && 1427 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) 1428 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); 1429 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); 1430 1431 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 1432 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1433 if (rdev->sb_size & bmask) 1434 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1435 1436 if (minor_version 1437 && rdev->data_offset < sb_start + (rdev->sb_size/512)) 1438 return -EINVAL; 1439 if (minor_version 1440 && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) 1441 return -EINVAL; 1442 1443 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) 1444 rdev->desc_nr = -1; 1445 else 1446 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1447 1448 if (!rdev->bb_page) { 1449 rdev->bb_page = alloc_page(GFP_KERNEL); 1450 if (!rdev->bb_page) 1451 return -ENOMEM; 1452 } 1453 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && 1454 rdev->badblocks.count == 0) { 1455 /* need to load the bad block list. 1456 * Currently we limit it to one page. 1457 */ 1458 s32 offset; 1459 sector_t bb_sector; 1460 u64 *bbp; 1461 int i; 1462 int sectors = le16_to_cpu(sb->bblog_size); 1463 if (sectors > (PAGE_SIZE / 512)) 1464 return -EINVAL; 1465 offset = le32_to_cpu(sb->bblog_offset); 1466 if (offset == 0) 1467 return -EINVAL; 1468 bb_sector = (long long)offset; 1469 if (!sync_page_io(rdev, bb_sector, sectors << 9, 1470 rdev->bb_page, READ, true)) 1471 return -EIO; 1472 bbp = (u64 *)page_address(rdev->bb_page); 1473 rdev->badblocks.shift = sb->bblog_shift; 1474 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { 1475 u64 bb = le64_to_cpu(*bbp); 1476 int count = bb & (0x3ff); 1477 u64 sector = bb >> 10; 1478 sector <<= sb->bblog_shift; 1479 count <<= sb->bblog_shift; 1480 if (bb + 1 == 0) 1481 break; 1482 if (md_set_badblocks(&rdev->badblocks, 1483 sector, count, 1) == 0) 1484 return -EINVAL; 1485 } 1486 } else if (sb->bblog_offset != 0) 1487 rdev->badblocks.shift = 0; 1488 1489 if (!refdev) { 1490 ret = 1; 1491 } else { 1492 __u64 ev1, ev2; 1493 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); 1494 1495 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 1496 sb->level != refsb->level || 1497 sb->layout != refsb->layout || 1498 sb->chunksize != refsb->chunksize) { 1499 printk(KERN_WARNING "md: %s has strangely different" 1500 " superblock to %s\n", 1501 bdevname(rdev->bdev,b), 1502 bdevname(refdev->bdev,b2)); 1503 return -EINVAL; 1504 } 1505 ev1 = le64_to_cpu(sb->events); 1506 ev2 = le64_to_cpu(refsb->events); 1507 1508 if (ev1 > ev2) 1509 ret = 1; 1510 else 1511 ret = 0; 1512 } 1513 if (minor_version) { 1514 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); 1515 sectors -= rdev->data_offset; 1516 } else 1517 sectors = rdev->sb_start; 1518 if (sectors < le64_to_cpu(sb->data_size)) 1519 return -EINVAL; 1520 rdev->sectors = le64_to_cpu(sb->data_size); 1521 return ret; 1522 } 1523 1524 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) 1525 { 1526 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 1527 __u64 ev1 = le64_to_cpu(sb->events); 1528 1529 rdev->raid_disk = -1; 1530 clear_bit(Faulty, &rdev->flags); 1531 clear_bit(In_sync, &rdev->flags); 1532 clear_bit(Bitmap_sync, &rdev->flags); 1533 clear_bit(WriteMostly, &rdev->flags); 1534 1535 if (mddev->raid_disks == 0) { 1536 mddev->major_version = 1; 1537 mddev->patch_version = 0; 1538 mddev->external = 0; 1539 mddev->chunk_sectors = le32_to_cpu(sb->chunksize); 1540 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); 1541 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); 1542 mddev->level = le32_to_cpu(sb->level); 1543 mddev->clevel[0] = 0; 1544 mddev->layout = le32_to_cpu(sb->layout); 1545 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1546 mddev->dev_sectors = le64_to_cpu(sb->size); 1547 mddev->events = ev1; 1548 mddev->bitmap_info.offset = 0; 1549 mddev->bitmap_info.space = 0; 1550 /* Default location for bitmap is 1K after superblock 1551 * using 3K - total of 4K 1552 */ 1553 mddev->bitmap_info.default_offset = 1024 >> 9; 1554 mddev->bitmap_info.default_space = (4096-1024) >> 9; 1555 mddev->reshape_backwards = 0; 1556 1557 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1558 memcpy(mddev->uuid, sb->set_uuid, 16); 1559 1560 mddev->max_disks = (4096-256)/2; 1561 1562 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1563 mddev->bitmap_info.file == NULL) { 1564 mddev->bitmap_info.offset = 1565 (__s32)le32_to_cpu(sb->bitmap_offset); 1566 /* Metadata doesn't record how much space is available. 1567 * For 1.0, we assume we can use up to the superblock 1568 * if before, else to 4K beyond superblock. 1569 * For others, assume no change is possible. 1570 */ 1571 if (mddev->minor_version > 0) 1572 mddev->bitmap_info.space = 0; 1573 else if (mddev->bitmap_info.offset > 0) 1574 mddev->bitmap_info.space = 1575 8 - mddev->bitmap_info.offset; 1576 else 1577 mddev->bitmap_info.space = 1578 -mddev->bitmap_info.offset; 1579 } 1580 1581 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { 1582 mddev->reshape_position = le64_to_cpu(sb->reshape_position); 1583 mddev->delta_disks = le32_to_cpu(sb->delta_disks); 1584 mddev->new_level = le32_to_cpu(sb->new_level); 1585 mddev->new_layout = le32_to_cpu(sb->new_layout); 1586 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); 1587 if (mddev->delta_disks < 0 || 1588 (mddev->delta_disks == 0 && 1589 (le32_to_cpu(sb->feature_map) 1590 & MD_FEATURE_RESHAPE_BACKWARDS))) 1591 mddev->reshape_backwards = 1; 1592 } else { 1593 mddev->reshape_position = MaxSector; 1594 mddev->delta_disks = 0; 1595 mddev->new_level = mddev->level; 1596 mddev->new_layout = mddev->layout; 1597 mddev->new_chunk_sectors = mddev->chunk_sectors; 1598 } 1599 1600 } else if (mddev->pers == NULL) { 1601 /* Insist of good event counter while assembling, except for 1602 * spares (which don't need an event count) */ 1603 ++ev1; 1604 if (rdev->desc_nr >= 0 && 1605 rdev->desc_nr < le32_to_cpu(sb->max_dev) && 1606 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) 1607 if (ev1 < mddev->events) 1608 return -EINVAL; 1609 } else if (mddev->bitmap) { 1610 /* If adding to array with a bitmap, then we can accept an 1611 * older device, but not too old. 1612 */ 1613 if (ev1 < mddev->bitmap->events_cleared) 1614 return 0; 1615 if (ev1 < mddev->events) 1616 set_bit(Bitmap_sync, &rdev->flags); 1617 } else { 1618 if (ev1 < mddev->events) 1619 /* just a hot-add of a new device, leave raid_disk at -1 */ 1620 return 0; 1621 } 1622 if (mddev->level != LEVEL_MULTIPATH) { 1623 int role; 1624 if (rdev->desc_nr < 0 || 1625 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { 1626 role = 0xffff; 1627 rdev->desc_nr = -1; 1628 } else 1629 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1630 switch(role) { 1631 case 0xffff: /* spare */ 1632 break; 1633 case 0xfffe: /* faulty */ 1634 set_bit(Faulty, &rdev->flags); 1635 break; 1636 default: 1637 rdev->saved_raid_disk = role; 1638 if ((le32_to_cpu(sb->feature_map) & 1639 MD_FEATURE_RECOVERY_OFFSET)) { 1640 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 1641 if (!(le32_to_cpu(sb->feature_map) & 1642 MD_FEATURE_RECOVERY_BITMAP)) 1643 rdev->saved_raid_disk = -1; 1644 } else 1645 set_bit(In_sync, &rdev->flags); 1646 rdev->raid_disk = role; 1647 break; 1648 } 1649 if (sb->devflags & WriteMostly1) 1650 set_bit(WriteMostly, &rdev->flags); 1651 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) 1652 set_bit(Replacement, &rdev->flags); 1653 } else /* MULTIPATH are always insync */ 1654 set_bit(In_sync, &rdev->flags); 1655 1656 return 0; 1657 } 1658 1659 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) 1660 { 1661 struct mdp_superblock_1 *sb; 1662 struct md_rdev *rdev2; 1663 int max_dev, i; 1664 /* make rdev->sb match mddev and rdev data. */ 1665 1666 sb = page_address(rdev->sb_page); 1667 1668 sb->feature_map = 0; 1669 sb->pad0 = 0; 1670 sb->recovery_offset = cpu_to_le64(0); 1671 memset(sb->pad3, 0, sizeof(sb->pad3)); 1672 1673 sb->utime = cpu_to_le64((__u64)mddev->utime); 1674 sb->events = cpu_to_le64(mddev->events); 1675 if (mddev->in_sync) 1676 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1677 else 1678 sb->resync_offset = cpu_to_le64(0); 1679 1680 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); 1681 1682 sb->raid_disks = cpu_to_le32(mddev->raid_disks); 1683 sb->size = cpu_to_le64(mddev->dev_sectors); 1684 sb->chunksize = cpu_to_le32(mddev->chunk_sectors); 1685 sb->level = cpu_to_le32(mddev->level); 1686 sb->layout = cpu_to_le32(mddev->layout); 1687 1688 if (test_bit(WriteMostly, &rdev->flags)) 1689 sb->devflags |= WriteMostly1; 1690 else 1691 sb->devflags &= ~WriteMostly1; 1692 sb->data_offset = cpu_to_le64(rdev->data_offset); 1693 sb->data_size = cpu_to_le64(rdev->sectors); 1694 1695 if (mddev->bitmap && mddev->bitmap_info.file == NULL) { 1696 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); 1697 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1698 } 1699 1700 if (rdev->raid_disk >= 0 && 1701 !test_bit(In_sync, &rdev->flags)) { 1702 sb->feature_map |= 1703 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); 1704 sb->recovery_offset = 1705 cpu_to_le64(rdev->recovery_offset); 1706 if (rdev->saved_raid_disk >= 0 && mddev->bitmap) 1707 sb->feature_map |= 1708 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); 1709 } 1710 if (test_bit(Replacement, &rdev->flags)) 1711 sb->feature_map |= 1712 cpu_to_le32(MD_FEATURE_REPLACEMENT); 1713 1714 if (mddev->reshape_position != MaxSector) { 1715 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); 1716 sb->reshape_position = cpu_to_le64(mddev->reshape_position); 1717 sb->new_layout = cpu_to_le32(mddev->new_layout); 1718 sb->delta_disks = cpu_to_le32(mddev->delta_disks); 1719 sb->new_level = cpu_to_le32(mddev->new_level); 1720 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); 1721 if (mddev->delta_disks == 0 && 1722 mddev->reshape_backwards) 1723 sb->feature_map 1724 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); 1725 if (rdev->new_data_offset != rdev->data_offset) { 1726 sb->feature_map 1727 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); 1728 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset 1729 - rdev->data_offset)); 1730 } 1731 } 1732 1733 if (rdev->badblocks.count == 0) 1734 /* Nothing to do for bad blocks*/ ; 1735 else if (sb->bblog_offset == 0) 1736 /* Cannot record bad blocks on this device */ 1737 md_error(mddev, rdev); 1738 else { 1739 struct badblocks *bb = &rdev->badblocks; 1740 u64 *bbp = (u64 *)page_address(rdev->bb_page); 1741 u64 *p = bb->page; 1742 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); 1743 if (bb->changed) { 1744 unsigned seq; 1745 1746 retry: 1747 seq = read_seqbegin(&bb->lock); 1748 1749 memset(bbp, 0xff, PAGE_SIZE); 1750 1751 for (i = 0 ; i < bb->count ; i++) { 1752 u64 internal_bb = p[i]; 1753 u64 store_bb = ((BB_OFFSET(internal_bb) << 10) 1754 | BB_LEN(internal_bb)); 1755 bbp[i] = cpu_to_le64(store_bb); 1756 } 1757 bb->changed = 0; 1758 if (read_seqretry(&bb->lock, seq)) 1759 goto retry; 1760 1761 bb->sector = (rdev->sb_start + 1762 (int)le32_to_cpu(sb->bblog_offset)); 1763 bb->size = le16_to_cpu(sb->bblog_size); 1764 } 1765 } 1766 1767 max_dev = 0; 1768 rdev_for_each(rdev2, mddev) 1769 if (rdev2->desc_nr+1 > max_dev) 1770 max_dev = rdev2->desc_nr+1; 1771 1772 if (max_dev > le32_to_cpu(sb->max_dev)) { 1773 int bmask; 1774 sb->max_dev = cpu_to_le32(max_dev); 1775 rdev->sb_size = max_dev * 2 + 256; 1776 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1777 if (rdev->sb_size & bmask) 1778 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1779 } else 1780 max_dev = le32_to_cpu(sb->max_dev); 1781 1782 for (i=0; i<max_dev;i++) 1783 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1784 1785 rdev_for_each(rdev2, mddev) { 1786 i = rdev2->desc_nr; 1787 if (test_bit(Faulty, &rdev2->flags)) 1788 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1789 else if (test_bit(In_sync, &rdev2->flags)) 1790 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1791 else if (rdev2->raid_disk >= 0) 1792 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1793 else 1794 sb->dev_roles[i] = cpu_to_le16(0xffff); 1795 } 1796 1797 sb->sb_csum = calc_sb_1_csum(sb); 1798 } 1799 1800 static unsigned long long 1801 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1802 { 1803 struct mdp_superblock_1 *sb; 1804 sector_t max_sectors; 1805 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1806 return 0; /* component must fit device */ 1807 if (rdev->data_offset != rdev->new_data_offset) 1808 return 0; /* too confusing */ 1809 if (rdev->sb_start < rdev->data_offset) { 1810 /* minor versions 1 and 2; superblock before data */ 1811 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; 1812 max_sectors -= rdev->data_offset; 1813 if (!num_sectors || num_sectors > max_sectors) 1814 num_sectors = max_sectors; 1815 } else if (rdev->mddev->bitmap_info.offset) { 1816 /* minor version 0 with bitmap we can't move */ 1817 return 0; 1818 } else { 1819 /* minor version 0; superblock after data */ 1820 sector_t sb_start; 1821 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; 1822 sb_start &= ~(sector_t)(4*2 - 1); 1823 max_sectors = rdev->sectors + sb_start - rdev->sb_start; 1824 if (!num_sectors || num_sectors > max_sectors) 1825 num_sectors = max_sectors; 1826 rdev->sb_start = sb_start; 1827 } 1828 sb = page_address(rdev->sb_page); 1829 sb->data_size = cpu_to_le64(num_sectors); 1830 sb->super_offset = rdev->sb_start; 1831 sb->sb_csum = calc_sb_1_csum(sb); 1832 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1833 rdev->sb_page); 1834 md_super_wait(rdev->mddev); 1835 return num_sectors; 1836 1837 } 1838 1839 static int 1840 super_1_allow_new_offset(struct md_rdev *rdev, 1841 unsigned long long new_offset) 1842 { 1843 /* All necessary checks on new >= old have been done */ 1844 struct bitmap *bitmap; 1845 if (new_offset >= rdev->data_offset) 1846 return 1; 1847 1848 /* with 1.0 metadata, there is no metadata to tread on 1849 * so we can always move back */ 1850 if (rdev->mddev->minor_version == 0) 1851 return 1; 1852 1853 /* otherwise we must be sure not to step on 1854 * any metadata, so stay: 1855 * 36K beyond start of superblock 1856 * beyond end of badblocks 1857 * beyond write-intent bitmap 1858 */ 1859 if (rdev->sb_start + (32+4)*2 > new_offset) 1860 return 0; 1861 bitmap = rdev->mddev->bitmap; 1862 if (bitmap && !rdev->mddev->bitmap_info.file && 1863 rdev->sb_start + rdev->mddev->bitmap_info.offset + 1864 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) 1865 return 0; 1866 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) 1867 return 0; 1868 1869 return 1; 1870 } 1871 1872 static struct super_type super_types[] = { 1873 [0] = { 1874 .name = "0.90.0", 1875 .owner = THIS_MODULE, 1876 .load_super = super_90_load, 1877 .validate_super = super_90_validate, 1878 .sync_super = super_90_sync, 1879 .rdev_size_change = super_90_rdev_size_change, 1880 .allow_new_offset = super_90_allow_new_offset, 1881 }, 1882 [1] = { 1883 .name = "md-1", 1884 .owner = THIS_MODULE, 1885 .load_super = super_1_load, 1886 .validate_super = super_1_validate, 1887 .sync_super = super_1_sync, 1888 .rdev_size_change = super_1_rdev_size_change, 1889 .allow_new_offset = super_1_allow_new_offset, 1890 }, 1891 }; 1892 1893 static void sync_super(struct mddev *mddev, struct md_rdev *rdev) 1894 { 1895 if (mddev->sync_super) { 1896 mddev->sync_super(mddev, rdev); 1897 return; 1898 } 1899 1900 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); 1901 1902 super_types[mddev->major_version].sync_super(mddev, rdev); 1903 } 1904 1905 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) 1906 { 1907 struct md_rdev *rdev, *rdev2; 1908 1909 rcu_read_lock(); 1910 rdev_for_each_rcu(rdev, mddev1) 1911 rdev_for_each_rcu(rdev2, mddev2) 1912 if (rdev->bdev->bd_contains == 1913 rdev2->bdev->bd_contains) { 1914 rcu_read_unlock(); 1915 return 1; 1916 } 1917 rcu_read_unlock(); 1918 return 0; 1919 } 1920 1921 static LIST_HEAD(pending_raid_disks); 1922 1923 /* 1924 * Try to register data integrity profile for an mddev 1925 * 1926 * This is called when an array is started and after a disk has been kicked 1927 * from the array. It only succeeds if all working and active component devices 1928 * are integrity capable with matching profiles. 1929 */ 1930 int md_integrity_register(struct mddev *mddev) 1931 { 1932 struct md_rdev *rdev, *reference = NULL; 1933 1934 if (list_empty(&mddev->disks)) 1935 return 0; /* nothing to do */ 1936 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) 1937 return 0; /* shouldn't register, or already is */ 1938 rdev_for_each(rdev, mddev) { 1939 /* skip spares and non-functional disks */ 1940 if (test_bit(Faulty, &rdev->flags)) 1941 continue; 1942 if (rdev->raid_disk < 0) 1943 continue; 1944 if (!reference) { 1945 /* Use the first rdev as the reference */ 1946 reference = rdev; 1947 continue; 1948 } 1949 /* does this rdev's profile match the reference profile? */ 1950 if (blk_integrity_compare(reference->bdev->bd_disk, 1951 rdev->bdev->bd_disk) < 0) 1952 return -EINVAL; 1953 } 1954 if (!reference || !bdev_get_integrity(reference->bdev)) 1955 return 0; 1956 /* 1957 * All component devices are integrity capable and have matching 1958 * profiles, register the common profile for the md device. 1959 */ 1960 if (blk_integrity_register(mddev->gendisk, 1961 bdev_get_integrity(reference->bdev)) != 0) { 1962 printk(KERN_ERR "md: failed to register integrity for %s\n", 1963 mdname(mddev)); 1964 return -EINVAL; 1965 } 1966 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); 1967 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { 1968 printk(KERN_ERR "md: failed to create integrity pool for %s\n", 1969 mdname(mddev)); 1970 return -EINVAL; 1971 } 1972 return 0; 1973 } 1974 EXPORT_SYMBOL(md_integrity_register); 1975 1976 /* Disable data integrity if non-capable/non-matching disk is being added */ 1977 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) 1978 { 1979 struct blk_integrity *bi_rdev; 1980 struct blk_integrity *bi_mddev; 1981 1982 if (!mddev->gendisk) 1983 return; 1984 1985 bi_rdev = bdev_get_integrity(rdev->bdev); 1986 bi_mddev = blk_get_integrity(mddev->gendisk); 1987 1988 if (!bi_mddev) /* nothing to do */ 1989 return; 1990 if (rdev->raid_disk < 0) /* skip spares */ 1991 return; 1992 if (bi_rdev && blk_integrity_compare(mddev->gendisk, 1993 rdev->bdev->bd_disk) >= 0) 1994 return; 1995 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); 1996 blk_integrity_unregister(mddev->gendisk); 1997 } 1998 EXPORT_SYMBOL(md_integrity_add_rdev); 1999 2000 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) 2001 { 2002 char b[BDEVNAME_SIZE]; 2003 struct kobject *ko; 2004 char *s; 2005 int err; 2006 2007 /* prevent duplicates */ 2008 if (find_rdev(mddev, rdev->bdev->bd_dev)) 2009 return -EEXIST; 2010 2011 /* make sure rdev->sectors exceeds mddev->dev_sectors */ 2012 if (rdev->sectors && (mddev->dev_sectors == 0 || 2013 rdev->sectors < mddev->dev_sectors)) { 2014 if (mddev->pers) { 2015 /* Cannot change size, so fail 2016 * If mddev->level <= 0, then we don't care 2017 * about aligning sizes (e.g. linear) 2018 */ 2019 if (mddev->level > 0) 2020 return -ENOSPC; 2021 } else 2022 mddev->dev_sectors = rdev->sectors; 2023 } 2024 2025 /* Verify rdev->desc_nr is unique. 2026 * If it is -1, assign a free number, else 2027 * check number is not in use 2028 */ 2029 rcu_read_lock(); 2030 if (rdev->desc_nr < 0) { 2031 int choice = 0; 2032 if (mddev->pers) 2033 choice = mddev->raid_disks; 2034 while (find_rdev_nr_rcu(mddev, choice)) 2035 choice++; 2036 rdev->desc_nr = choice; 2037 } else { 2038 if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) { 2039 rcu_read_unlock(); 2040 return -EBUSY; 2041 } 2042 } 2043 rcu_read_unlock(); 2044 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { 2045 printk(KERN_WARNING "md: %s: array is limited to %d devices\n", 2046 mdname(mddev), mddev->max_disks); 2047 return -EBUSY; 2048 } 2049 bdevname(rdev->bdev,b); 2050 while ( (s=strchr(b, '/')) != NULL) 2051 *s = '!'; 2052 2053 rdev->mddev = mddev; 2054 printk(KERN_INFO "md: bind<%s>\n", b); 2055 2056 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) 2057 goto fail; 2058 2059 ko = &part_to_dev(rdev->bdev->bd_part)->kobj; 2060 if (sysfs_create_link(&rdev->kobj, ko, "block")) 2061 /* failure here is OK */; 2062 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); 2063 2064 list_add_rcu(&rdev->same_set, &mddev->disks); 2065 bd_link_disk_holder(rdev->bdev, mddev->gendisk); 2066 2067 /* May as well allow recovery to be retried once */ 2068 mddev->recovery_disabled++; 2069 2070 return 0; 2071 2072 fail: 2073 printk(KERN_WARNING "md: failed to register dev-%s for %s\n", 2074 b, mdname(mddev)); 2075 return err; 2076 } 2077 2078 static void md_delayed_delete(struct work_struct *ws) 2079 { 2080 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); 2081 kobject_del(&rdev->kobj); 2082 kobject_put(&rdev->kobj); 2083 } 2084 2085 static void unbind_rdev_from_array(struct md_rdev *rdev) 2086 { 2087 char b[BDEVNAME_SIZE]; 2088 2089 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); 2090 list_del_rcu(&rdev->same_set); 2091 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); 2092 rdev->mddev = NULL; 2093 sysfs_remove_link(&rdev->kobj, "block"); 2094 sysfs_put(rdev->sysfs_state); 2095 rdev->sysfs_state = NULL; 2096 rdev->badblocks.count = 0; 2097 /* We need to delay this, otherwise we can deadlock when 2098 * writing to 'remove' to "dev/state". We also need 2099 * to delay it due to rcu usage. 2100 */ 2101 synchronize_rcu(); 2102 INIT_WORK(&rdev->del_work, md_delayed_delete); 2103 kobject_get(&rdev->kobj); 2104 queue_work(md_misc_wq, &rdev->del_work); 2105 } 2106 2107 /* 2108 * prevent the device from being mounted, repartitioned or 2109 * otherwise reused by a RAID array (or any other kernel 2110 * subsystem), by bd_claiming the device. 2111 */ 2112 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) 2113 { 2114 int err = 0; 2115 struct block_device *bdev; 2116 char b[BDEVNAME_SIZE]; 2117 2118 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 2119 shared ? (struct md_rdev *)lock_rdev : rdev); 2120 if (IS_ERR(bdev)) { 2121 printk(KERN_ERR "md: could not open %s.\n", 2122 __bdevname(dev, b)); 2123 return PTR_ERR(bdev); 2124 } 2125 rdev->bdev = bdev; 2126 return err; 2127 } 2128 2129 static void unlock_rdev(struct md_rdev *rdev) 2130 { 2131 struct block_device *bdev = rdev->bdev; 2132 rdev->bdev = NULL; 2133 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 2134 } 2135 2136 void md_autodetect_dev(dev_t dev); 2137 2138 static void export_rdev(struct md_rdev *rdev) 2139 { 2140 char b[BDEVNAME_SIZE]; 2141 2142 printk(KERN_INFO "md: export_rdev(%s)\n", 2143 bdevname(rdev->bdev,b)); 2144 md_rdev_clear(rdev); 2145 #ifndef MODULE 2146 if (test_bit(AutoDetected, &rdev->flags)) 2147 md_autodetect_dev(rdev->bdev->bd_dev); 2148 #endif 2149 unlock_rdev(rdev); 2150 kobject_put(&rdev->kobj); 2151 } 2152 2153 static void kick_rdev_from_array(struct md_rdev *rdev) 2154 { 2155 unbind_rdev_from_array(rdev); 2156 export_rdev(rdev); 2157 } 2158 2159 static void export_array(struct mddev *mddev) 2160 { 2161 struct md_rdev *rdev; 2162 2163 while (!list_empty(&mddev->disks)) { 2164 rdev = list_first_entry(&mddev->disks, struct md_rdev, 2165 same_set); 2166 kick_rdev_from_array(rdev); 2167 } 2168 mddev->raid_disks = 0; 2169 mddev->major_version = 0; 2170 } 2171 2172 static void sync_sbs(struct mddev *mddev, int nospares) 2173 { 2174 /* Update each superblock (in-memory image), but 2175 * if we are allowed to, skip spares which already 2176 * have the right event counter, or have one earlier 2177 * (which would mean they aren't being marked as dirty 2178 * with the rest of the array) 2179 */ 2180 struct md_rdev *rdev; 2181 rdev_for_each(rdev, mddev) { 2182 if (rdev->sb_events == mddev->events || 2183 (nospares && 2184 rdev->raid_disk < 0 && 2185 rdev->sb_events+1 == mddev->events)) { 2186 /* Don't update this superblock */ 2187 rdev->sb_loaded = 2; 2188 } else { 2189 sync_super(mddev, rdev); 2190 rdev->sb_loaded = 1; 2191 } 2192 } 2193 } 2194 2195 static void md_update_sb(struct mddev *mddev, int force_change) 2196 { 2197 struct md_rdev *rdev; 2198 int sync_req; 2199 int nospares = 0; 2200 int any_badblocks_changed = 0; 2201 2202 if (mddev->ro) { 2203 if (force_change) 2204 set_bit(MD_CHANGE_DEVS, &mddev->flags); 2205 return; 2206 } 2207 repeat: 2208 /* First make sure individual recovery_offsets are correct */ 2209 rdev_for_each(rdev, mddev) { 2210 if (rdev->raid_disk >= 0 && 2211 mddev->delta_disks >= 0 && 2212 !test_bit(In_sync, &rdev->flags) && 2213 mddev->curr_resync_completed > rdev->recovery_offset) 2214 rdev->recovery_offset = mddev->curr_resync_completed; 2215 2216 } 2217 if (!mddev->persistent) { 2218 clear_bit(MD_CHANGE_CLEAN, &mddev->flags); 2219 clear_bit(MD_CHANGE_DEVS, &mddev->flags); 2220 if (!mddev->external) { 2221 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2222 rdev_for_each(rdev, mddev) { 2223 if (rdev->badblocks.changed) { 2224 rdev->badblocks.changed = 0; 2225 md_ack_all_badblocks(&rdev->badblocks); 2226 md_error(mddev, rdev); 2227 } 2228 clear_bit(Blocked, &rdev->flags); 2229 clear_bit(BlockedBadBlocks, &rdev->flags); 2230 wake_up(&rdev->blocked_wait); 2231 } 2232 } 2233 wake_up(&mddev->sb_wait); 2234 return; 2235 } 2236 2237 spin_lock_irq(&mddev->write_lock); 2238 2239 mddev->utime = get_seconds(); 2240 2241 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) 2242 force_change = 1; 2243 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) 2244 /* just a clean<-> dirty transition, possibly leave spares alone, 2245 * though if events isn't the right even/odd, we will have to do 2246 * spares after all 2247 */ 2248 nospares = 1; 2249 if (force_change) 2250 nospares = 0; 2251 if (mddev->degraded) 2252 /* If the array is degraded, then skipping spares is both 2253 * dangerous and fairly pointless. 2254 * Dangerous because a device that was removed from the array 2255 * might have a event_count that still looks up-to-date, 2256 * so it can be re-added without a resync. 2257 * Pointless because if there are any spares to skip, 2258 * then a recovery will happen and soon that array won't 2259 * be degraded any more and the spare can go back to sleep then. 2260 */ 2261 nospares = 0; 2262 2263 sync_req = mddev->in_sync; 2264 2265 /* If this is just a dirty<->clean transition, and the array is clean 2266 * and 'events' is odd, we can roll back to the previous clean state */ 2267 if (nospares 2268 && (mddev->in_sync && mddev->recovery_cp == MaxSector) 2269 && mddev->can_decrease_events 2270 && mddev->events != 1) { 2271 mddev->events--; 2272 mddev->can_decrease_events = 0; 2273 } else { 2274 /* otherwise we have to go forward and ... */ 2275 mddev->events ++; 2276 mddev->can_decrease_events = nospares; 2277 } 2278 2279 /* 2280 * This 64-bit counter should never wrap. 2281 * Either we are in around ~1 trillion A.C., assuming 2282 * 1 reboot per second, or we have a bug... 2283 */ 2284 WARN_ON(mddev->events == 0); 2285 2286 rdev_for_each(rdev, mddev) { 2287 if (rdev->badblocks.changed) 2288 any_badblocks_changed++; 2289 if (test_bit(Faulty, &rdev->flags)) 2290 set_bit(FaultRecorded, &rdev->flags); 2291 } 2292 2293 sync_sbs(mddev, nospares); 2294 spin_unlock_irq(&mddev->write_lock); 2295 2296 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", 2297 mdname(mddev), mddev->in_sync); 2298 2299 bitmap_update_sb(mddev->bitmap); 2300 rdev_for_each(rdev, mddev) { 2301 char b[BDEVNAME_SIZE]; 2302 2303 if (rdev->sb_loaded != 1) 2304 continue; /* no noise on spare devices */ 2305 2306 if (!test_bit(Faulty, &rdev->flags)) { 2307 md_super_write(mddev,rdev, 2308 rdev->sb_start, rdev->sb_size, 2309 rdev->sb_page); 2310 pr_debug("md: (write) %s's sb offset: %llu\n", 2311 bdevname(rdev->bdev, b), 2312 (unsigned long long)rdev->sb_start); 2313 rdev->sb_events = mddev->events; 2314 if (rdev->badblocks.size) { 2315 md_super_write(mddev, rdev, 2316 rdev->badblocks.sector, 2317 rdev->badblocks.size << 9, 2318 rdev->bb_page); 2319 rdev->badblocks.size = 0; 2320 } 2321 2322 } else 2323 pr_debug("md: %s (skipping faulty)\n", 2324 bdevname(rdev->bdev, b)); 2325 2326 if (mddev->level == LEVEL_MULTIPATH) 2327 /* only need to write one superblock... */ 2328 break; 2329 } 2330 md_super_wait(mddev); 2331 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ 2332 2333 spin_lock_irq(&mddev->write_lock); 2334 if (mddev->in_sync != sync_req || 2335 test_bit(MD_CHANGE_DEVS, &mddev->flags)) { 2336 /* have to write it out again */ 2337 spin_unlock_irq(&mddev->write_lock); 2338 goto repeat; 2339 } 2340 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2341 spin_unlock_irq(&mddev->write_lock); 2342 wake_up(&mddev->sb_wait); 2343 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 2344 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 2345 2346 rdev_for_each(rdev, mddev) { 2347 if (test_and_clear_bit(FaultRecorded, &rdev->flags)) 2348 clear_bit(Blocked, &rdev->flags); 2349 2350 if (any_badblocks_changed) 2351 md_ack_all_badblocks(&rdev->badblocks); 2352 clear_bit(BlockedBadBlocks, &rdev->flags); 2353 wake_up(&rdev->blocked_wait); 2354 } 2355 } 2356 2357 /* words written to sysfs files may, or may not, be \n terminated. 2358 * We want to accept with case. For this we use cmd_match. 2359 */ 2360 static int cmd_match(const char *cmd, const char *str) 2361 { 2362 /* See if cmd, written into a sysfs file, matches 2363 * str. They must either be the same, or cmd can 2364 * have a trailing newline 2365 */ 2366 while (*cmd && *str && *cmd == *str) { 2367 cmd++; 2368 str++; 2369 } 2370 if (*cmd == '\n') 2371 cmd++; 2372 if (*str || *cmd) 2373 return 0; 2374 return 1; 2375 } 2376 2377 struct rdev_sysfs_entry { 2378 struct attribute attr; 2379 ssize_t (*show)(struct md_rdev *, char *); 2380 ssize_t (*store)(struct md_rdev *, const char *, size_t); 2381 }; 2382 2383 static ssize_t 2384 state_show(struct md_rdev *rdev, char *page) 2385 { 2386 char *sep = ""; 2387 size_t len = 0; 2388 2389 if (test_bit(Faulty, &rdev->flags) || 2390 rdev->badblocks.unacked_exist) { 2391 len+= sprintf(page+len, "%sfaulty",sep); 2392 sep = ","; 2393 } 2394 if (test_bit(In_sync, &rdev->flags)) { 2395 len += sprintf(page+len, "%sin_sync",sep); 2396 sep = ","; 2397 } 2398 if (test_bit(WriteMostly, &rdev->flags)) { 2399 len += sprintf(page+len, "%swrite_mostly",sep); 2400 sep = ","; 2401 } 2402 if (test_bit(Blocked, &rdev->flags) || 2403 (rdev->badblocks.unacked_exist 2404 && !test_bit(Faulty, &rdev->flags))) { 2405 len += sprintf(page+len, "%sblocked", sep); 2406 sep = ","; 2407 } 2408 if (!test_bit(Faulty, &rdev->flags) && 2409 !test_bit(In_sync, &rdev->flags)) { 2410 len += sprintf(page+len, "%sspare", sep); 2411 sep = ","; 2412 } 2413 if (test_bit(WriteErrorSeen, &rdev->flags)) { 2414 len += sprintf(page+len, "%swrite_error", sep); 2415 sep = ","; 2416 } 2417 if (test_bit(WantReplacement, &rdev->flags)) { 2418 len += sprintf(page+len, "%swant_replacement", sep); 2419 sep = ","; 2420 } 2421 if (test_bit(Replacement, &rdev->flags)) { 2422 len += sprintf(page+len, "%sreplacement", sep); 2423 sep = ","; 2424 } 2425 2426 return len+sprintf(page+len, "\n"); 2427 } 2428 2429 static ssize_t 2430 state_store(struct md_rdev *rdev, const char *buf, size_t len) 2431 { 2432 /* can write 2433 * faulty - simulates an error 2434 * remove - disconnects the device 2435 * writemostly - sets write_mostly 2436 * -writemostly - clears write_mostly 2437 * blocked - sets the Blocked flags 2438 * -blocked - clears the Blocked and possibly simulates an error 2439 * insync - sets Insync providing device isn't active 2440 * -insync - clear Insync for a device with a slot assigned, 2441 * so that it gets rebuilt based on bitmap 2442 * write_error - sets WriteErrorSeen 2443 * -write_error - clears WriteErrorSeen 2444 */ 2445 int err = -EINVAL; 2446 if (cmd_match(buf, "faulty") && rdev->mddev->pers) { 2447 md_error(rdev->mddev, rdev); 2448 if (test_bit(Faulty, &rdev->flags)) 2449 err = 0; 2450 else 2451 err = -EBUSY; 2452 } else if (cmd_match(buf, "remove")) { 2453 if (rdev->raid_disk >= 0) 2454 err = -EBUSY; 2455 else { 2456 struct mddev *mddev = rdev->mddev; 2457 kick_rdev_from_array(rdev); 2458 if (mddev->pers) 2459 md_update_sb(mddev, 1); 2460 md_new_event(mddev); 2461 err = 0; 2462 } 2463 } else if (cmd_match(buf, "writemostly")) { 2464 set_bit(WriteMostly, &rdev->flags); 2465 err = 0; 2466 } else if (cmd_match(buf, "-writemostly")) { 2467 clear_bit(WriteMostly, &rdev->flags); 2468 err = 0; 2469 } else if (cmd_match(buf, "blocked")) { 2470 set_bit(Blocked, &rdev->flags); 2471 err = 0; 2472 } else if (cmd_match(buf, "-blocked")) { 2473 if (!test_bit(Faulty, &rdev->flags) && 2474 rdev->badblocks.unacked_exist) { 2475 /* metadata handler doesn't understand badblocks, 2476 * so we need to fail the device 2477 */ 2478 md_error(rdev->mddev, rdev); 2479 } 2480 clear_bit(Blocked, &rdev->flags); 2481 clear_bit(BlockedBadBlocks, &rdev->flags); 2482 wake_up(&rdev->blocked_wait); 2483 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2484 md_wakeup_thread(rdev->mddev->thread); 2485 2486 err = 0; 2487 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { 2488 set_bit(In_sync, &rdev->flags); 2489 err = 0; 2490 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { 2491 if (rdev->mddev->pers == NULL) { 2492 clear_bit(In_sync, &rdev->flags); 2493 rdev->saved_raid_disk = rdev->raid_disk; 2494 rdev->raid_disk = -1; 2495 err = 0; 2496 } 2497 } else if (cmd_match(buf, "write_error")) { 2498 set_bit(WriteErrorSeen, &rdev->flags); 2499 err = 0; 2500 } else if (cmd_match(buf, "-write_error")) { 2501 clear_bit(WriteErrorSeen, &rdev->flags); 2502 err = 0; 2503 } else if (cmd_match(buf, "want_replacement")) { 2504 /* Any non-spare device that is not a replacement can 2505 * become want_replacement at any time, but we then need to 2506 * check if recovery is needed. 2507 */ 2508 if (rdev->raid_disk >= 0 && 2509 !test_bit(Replacement, &rdev->flags)) 2510 set_bit(WantReplacement, &rdev->flags); 2511 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2512 md_wakeup_thread(rdev->mddev->thread); 2513 err = 0; 2514 } else if (cmd_match(buf, "-want_replacement")) { 2515 /* Clearing 'want_replacement' is always allowed. 2516 * Once replacements starts it is too late though. 2517 */ 2518 err = 0; 2519 clear_bit(WantReplacement, &rdev->flags); 2520 } else if (cmd_match(buf, "replacement")) { 2521 /* Can only set a device as a replacement when array has not 2522 * yet been started. Once running, replacement is automatic 2523 * from spares, or by assigning 'slot'. 2524 */ 2525 if (rdev->mddev->pers) 2526 err = -EBUSY; 2527 else { 2528 set_bit(Replacement, &rdev->flags); 2529 err = 0; 2530 } 2531 } else if (cmd_match(buf, "-replacement")) { 2532 /* Similarly, can only clear Replacement before start */ 2533 if (rdev->mddev->pers) 2534 err = -EBUSY; 2535 else { 2536 clear_bit(Replacement, &rdev->flags); 2537 err = 0; 2538 } 2539 } 2540 if (!err) 2541 sysfs_notify_dirent_safe(rdev->sysfs_state); 2542 return err ? err : len; 2543 } 2544 static struct rdev_sysfs_entry rdev_state = 2545 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); 2546 2547 static ssize_t 2548 errors_show(struct md_rdev *rdev, char *page) 2549 { 2550 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); 2551 } 2552 2553 static ssize_t 2554 errors_store(struct md_rdev *rdev, const char *buf, size_t len) 2555 { 2556 char *e; 2557 unsigned long n = simple_strtoul(buf, &e, 10); 2558 if (*buf && (*e == 0 || *e == '\n')) { 2559 atomic_set(&rdev->corrected_errors, n); 2560 return len; 2561 } 2562 return -EINVAL; 2563 } 2564 static struct rdev_sysfs_entry rdev_errors = 2565 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); 2566 2567 static ssize_t 2568 slot_show(struct md_rdev *rdev, char *page) 2569 { 2570 if (rdev->raid_disk < 0) 2571 return sprintf(page, "none\n"); 2572 else 2573 return sprintf(page, "%d\n", rdev->raid_disk); 2574 } 2575 2576 static ssize_t 2577 slot_store(struct md_rdev *rdev, const char *buf, size_t len) 2578 { 2579 char *e; 2580 int err; 2581 int slot = simple_strtoul(buf, &e, 10); 2582 if (strncmp(buf, "none", 4)==0) 2583 slot = -1; 2584 else if (e==buf || (*e && *e!= '\n')) 2585 return -EINVAL; 2586 if (rdev->mddev->pers && slot == -1) { 2587 /* Setting 'slot' on an active array requires also 2588 * updating the 'rd%d' link, and communicating 2589 * with the personality with ->hot_*_disk. 2590 * For now we only support removing 2591 * failed/spare devices. This normally happens automatically, 2592 * but not when the metadata is externally managed. 2593 */ 2594 if (rdev->raid_disk == -1) 2595 return -EEXIST; 2596 /* personality does all needed checks */ 2597 if (rdev->mddev->pers->hot_remove_disk == NULL) 2598 return -EINVAL; 2599 clear_bit(Blocked, &rdev->flags); 2600 remove_and_add_spares(rdev->mddev, rdev); 2601 if (rdev->raid_disk >= 0) 2602 return -EBUSY; 2603 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2604 md_wakeup_thread(rdev->mddev->thread); 2605 } else if (rdev->mddev->pers) { 2606 /* Activating a spare .. or possibly reactivating 2607 * if we ever get bitmaps working here. 2608 */ 2609 2610 if (rdev->raid_disk != -1) 2611 return -EBUSY; 2612 2613 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) 2614 return -EBUSY; 2615 2616 if (rdev->mddev->pers->hot_add_disk == NULL) 2617 return -EINVAL; 2618 2619 if (slot >= rdev->mddev->raid_disks && 2620 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 2621 return -ENOSPC; 2622 2623 rdev->raid_disk = slot; 2624 if (test_bit(In_sync, &rdev->flags)) 2625 rdev->saved_raid_disk = slot; 2626 else 2627 rdev->saved_raid_disk = -1; 2628 clear_bit(In_sync, &rdev->flags); 2629 clear_bit(Bitmap_sync, &rdev->flags); 2630 err = rdev->mddev->pers-> 2631 hot_add_disk(rdev->mddev, rdev); 2632 if (err) { 2633 rdev->raid_disk = -1; 2634 return err; 2635 } else 2636 sysfs_notify_dirent_safe(rdev->sysfs_state); 2637 if (sysfs_link_rdev(rdev->mddev, rdev)) 2638 /* failure here is OK */; 2639 /* don't wakeup anyone, leave that to userspace. */ 2640 } else { 2641 if (slot >= rdev->mddev->raid_disks && 2642 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 2643 return -ENOSPC; 2644 rdev->raid_disk = slot; 2645 /* assume it is working */ 2646 clear_bit(Faulty, &rdev->flags); 2647 clear_bit(WriteMostly, &rdev->flags); 2648 set_bit(In_sync, &rdev->flags); 2649 sysfs_notify_dirent_safe(rdev->sysfs_state); 2650 } 2651 return len; 2652 } 2653 2654 static struct rdev_sysfs_entry rdev_slot = 2655 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); 2656 2657 static ssize_t 2658 offset_show(struct md_rdev *rdev, char *page) 2659 { 2660 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); 2661 } 2662 2663 static ssize_t 2664 offset_store(struct md_rdev *rdev, const char *buf, size_t len) 2665 { 2666 unsigned long long offset; 2667 if (kstrtoull(buf, 10, &offset) < 0) 2668 return -EINVAL; 2669 if (rdev->mddev->pers && rdev->raid_disk >= 0) 2670 return -EBUSY; 2671 if (rdev->sectors && rdev->mddev->external) 2672 /* Must set offset before size, so overlap checks 2673 * can be sane */ 2674 return -EBUSY; 2675 rdev->data_offset = offset; 2676 rdev->new_data_offset = offset; 2677 return len; 2678 } 2679 2680 static struct rdev_sysfs_entry rdev_offset = 2681 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); 2682 2683 static ssize_t new_offset_show(struct md_rdev *rdev, char *page) 2684 { 2685 return sprintf(page, "%llu\n", 2686 (unsigned long long)rdev->new_data_offset); 2687 } 2688 2689 static ssize_t new_offset_store(struct md_rdev *rdev, 2690 const char *buf, size_t len) 2691 { 2692 unsigned long long new_offset; 2693 struct mddev *mddev = rdev->mddev; 2694 2695 if (kstrtoull(buf, 10, &new_offset) < 0) 2696 return -EINVAL; 2697 2698 if (mddev->sync_thread) 2699 return -EBUSY; 2700 if (new_offset == rdev->data_offset) 2701 /* reset is always permitted */ 2702 ; 2703 else if (new_offset > rdev->data_offset) { 2704 /* must not push array size beyond rdev_sectors */ 2705 if (new_offset - rdev->data_offset 2706 + mddev->dev_sectors > rdev->sectors) 2707 return -E2BIG; 2708 } 2709 /* Metadata worries about other space details. */ 2710 2711 /* decreasing the offset is inconsistent with a backwards 2712 * reshape. 2713 */ 2714 if (new_offset < rdev->data_offset && 2715 mddev->reshape_backwards) 2716 return -EINVAL; 2717 /* Increasing offset is inconsistent with forwards 2718 * reshape. reshape_direction should be set to 2719 * 'backwards' first. 2720 */ 2721 if (new_offset > rdev->data_offset && 2722 !mddev->reshape_backwards) 2723 return -EINVAL; 2724 2725 if (mddev->pers && mddev->persistent && 2726 !super_types[mddev->major_version] 2727 .allow_new_offset(rdev, new_offset)) 2728 return -E2BIG; 2729 rdev->new_data_offset = new_offset; 2730 if (new_offset > rdev->data_offset) 2731 mddev->reshape_backwards = 1; 2732 else if (new_offset < rdev->data_offset) 2733 mddev->reshape_backwards = 0; 2734 2735 return len; 2736 } 2737 static struct rdev_sysfs_entry rdev_new_offset = 2738 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); 2739 2740 static ssize_t 2741 rdev_size_show(struct md_rdev *rdev, char *page) 2742 { 2743 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); 2744 } 2745 2746 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) 2747 { 2748 /* check if two start/length pairs overlap */ 2749 if (s1+l1 <= s2) 2750 return 0; 2751 if (s2+l2 <= s1) 2752 return 0; 2753 return 1; 2754 } 2755 2756 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) 2757 { 2758 unsigned long long blocks; 2759 sector_t new; 2760 2761 if (kstrtoull(buf, 10, &blocks) < 0) 2762 return -EINVAL; 2763 2764 if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) 2765 return -EINVAL; /* sector conversion overflow */ 2766 2767 new = blocks * 2; 2768 if (new != blocks * 2) 2769 return -EINVAL; /* unsigned long long to sector_t overflow */ 2770 2771 *sectors = new; 2772 return 0; 2773 } 2774 2775 static ssize_t 2776 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) 2777 { 2778 struct mddev *my_mddev = rdev->mddev; 2779 sector_t oldsectors = rdev->sectors; 2780 sector_t sectors; 2781 2782 if (strict_blocks_to_sectors(buf, §ors) < 0) 2783 return -EINVAL; 2784 if (rdev->data_offset != rdev->new_data_offset) 2785 return -EINVAL; /* too confusing */ 2786 if (my_mddev->pers && rdev->raid_disk >= 0) { 2787 if (my_mddev->persistent) { 2788 sectors = super_types[my_mddev->major_version]. 2789 rdev_size_change(rdev, sectors); 2790 if (!sectors) 2791 return -EBUSY; 2792 } else if (!sectors) 2793 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - 2794 rdev->data_offset; 2795 if (!my_mddev->pers->resize) 2796 /* Cannot change size for RAID0 or Linear etc */ 2797 return -EINVAL; 2798 } 2799 if (sectors < my_mddev->dev_sectors) 2800 return -EINVAL; /* component must fit device */ 2801 2802 rdev->sectors = sectors; 2803 if (sectors > oldsectors && my_mddev->external) { 2804 /* Need to check that all other rdevs with the same 2805 * ->bdev do not overlap. 'rcu' is sufficient to walk 2806 * the rdev lists safely. 2807 * This check does not provide a hard guarantee, it 2808 * just helps avoid dangerous mistakes. 2809 */ 2810 struct mddev *mddev; 2811 int overlap = 0; 2812 struct list_head *tmp; 2813 2814 rcu_read_lock(); 2815 for_each_mddev(mddev, tmp) { 2816 struct md_rdev *rdev2; 2817 2818 rdev_for_each(rdev2, mddev) 2819 if (rdev->bdev == rdev2->bdev && 2820 rdev != rdev2 && 2821 overlaps(rdev->data_offset, rdev->sectors, 2822 rdev2->data_offset, 2823 rdev2->sectors)) { 2824 overlap = 1; 2825 break; 2826 } 2827 if (overlap) { 2828 mddev_put(mddev); 2829 break; 2830 } 2831 } 2832 rcu_read_unlock(); 2833 if (overlap) { 2834 /* Someone else could have slipped in a size 2835 * change here, but doing so is just silly. 2836 * We put oldsectors back because we *know* it is 2837 * safe, and trust userspace not to race with 2838 * itself 2839 */ 2840 rdev->sectors = oldsectors; 2841 return -EBUSY; 2842 } 2843 } 2844 return len; 2845 } 2846 2847 static struct rdev_sysfs_entry rdev_size = 2848 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); 2849 2850 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) 2851 { 2852 unsigned long long recovery_start = rdev->recovery_offset; 2853 2854 if (test_bit(In_sync, &rdev->flags) || 2855 recovery_start == MaxSector) 2856 return sprintf(page, "none\n"); 2857 2858 return sprintf(page, "%llu\n", recovery_start); 2859 } 2860 2861 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) 2862 { 2863 unsigned long long recovery_start; 2864 2865 if (cmd_match(buf, "none")) 2866 recovery_start = MaxSector; 2867 else if (kstrtoull(buf, 10, &recovery_start)) 2868 return -EINVAL; 2869 2870 if (rdev->mddev->pers && 2871 rdev->raid_disk >= 0) 2872 return -EBUSY; 2873 2874 rdev->recovery_offset = recovery_start; 2875 if (recovery_start == MaxSector) 2876 set_bit(In_sync, &rdev->flags); 2877 else 2878 clear_bit(In_sync, &rdev->flags); 2879 return len; 2880 } 2881 2882 static struct rdev_sysfs_entry rdev_recovery_start = 2883 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); 2884 2885 static ssize_t 2886 badblocks_show(struct badblocks *bb, char *page, int unack); 2887 static ssize_t 2888 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); 2889 2890 static ssize_t bb_show(struct md_rdev *rdev, char *page) 2891 { 2892 return badblocks_show(&rdev->badblocks, page, 0); 2893 } 2894 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) 2895 { 2896 int rv = badblocks_store(&rdev->badblocks, page, len, 0); 2897 /* Maybe that ack was all we needed */ 2898 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) 2899 wake_up(&rdev->blocked_wait); 2900 return rv; 2901 } 2902 static struct rdev_sysfs_entry rdev_bad_blocks = 2903 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); 2904 2905 static ssize_t ubb_show(struct md_rdev *rdev, char *page) 2906 { 2907 return badblocks_show(&rdev->badblocks, page, 1); 2908 } 2909 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) 2910 { 2911 return badblocks_store(&rdev->badblocks, page, len, 1); 2912 } 2913 static struct rdev_sysfs_entry rdev_unack_bad_blocks = 2914 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); 2915 2916 static struct attribute *rdev_default_attrs[] = { 2917 &rdev_state.attr, 2918 &rdev_errors.attr, 2919 &rdev_slot.attr, 2920 &rdev_offset.attr, 2921 &rdev_new_offset.attr, 2922 &rdev_size.attr, 2923 &rdev_recovery_start.attr, 2924 &rdev_bad_blocks.attr, 2925 &rdev_unack_bad_blocks.attr, 2926 NULL, 2927 }; 2928 static ssize_t 2929 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 2930 { 2931 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 2932 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 2933 struct mddev *mddev = rdev->mddev; 2934 ssize_t rv; 2935 2936 if (!entry->show) 2937 return -EIO; 2938 2939 rv = mddev ? mddev_lock(mddev) : -EBUSY; 2940 if (!rv) { 2941 if (rdev->mddev == NULL) 2942 rv = -EBUSY; 2943 else 2944 rv = entry->show(rdev, page); 2945 mddev_unlock(mddev); 2946 } 2947 return rv; 2948 } 2949 2950 static ssize_t 2951 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 2952 const char *page, size_t length) 2953 { 2954 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 2955 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 2956 ssize_t rv; 2957 struct mddev *mddev = rdev->mddev; 2958 2959 if (!entry->store) 2960 return -EIO; 2961 if (!capable(CAP_SYS_ADMIN)) 2962 return -EACCES; 2963 rv = mddev ? mddev_lock(mddev): -EBUSY; 2964 if (!rv) { 2965 if (rdev->mddev == NULL) 2966 rv = -EBUSY; 2967 else 2968 rv = entry->store(rdev, page, length); 2969 mddev_unlock(mddev); 2970 } 2971 return rv; 2972 } 2973 2974 static void rdev_free(struct kobject *ko) 2975 { 2976 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); 2977 kfree(rdev); 2978 } 2979 static const struct sysfs_ops rdev_sysfs_ops = { 2980 .show = rdev_attr_show, 2981 .store = rdev_attr_store, 2982 }; 2983 static struct kobj_type rdev_ktype = { 2984 .release = rdev_free, 2985 .sysfs_ops = &rdev_sysfs_ops, 2986 .default_attrs = rdev_default_attrs, 2987 }; 2988 2989 int md_rdev_init(struct md_rdev *rdev) 2990 { 2991 rdev->desc_nr = -1; 2992 rdev->saved_raid_disk = -1; 2993 rdev->raid_disk = -1; 2994 rdev->flags = 0; 2995 rdev->data_offset = 0; 2996 rdev->new_data_offset = 0; 2997 rdev->sb_events = 0; 2998 rdev->last_read_error.tv_sec = 0; 2999 rdev->last_read_error.tv_nsec = 0; 3000 rdev->sb_loaded = 0; 3001 rdev->bb_page = NULL; 3002 atomic_set(&rdev->nr_pending, 0); 3003 atomic_set(&rdev->read_errors, 0); 3004 atomic_set(&rdev->corrected_errors, 0); 3005 3006 INIT_LIST_HEAD(&rdev->same_set); 3007 init_waitqueue_head(&rdev->blocked_wait); 3008 3009 /* Add space to store bad block list. 3010 * This reserves the space even on arrays where it cannot 3011 * be used - I wonder if that matters 3012 */ 3013 rdev->badblocks.count = 0; 3014 rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ 3015 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); 3016 seqlock_init(&rdev->badblocks.lock); 3017 if (rdev->badblocks.page == NULL) 3018 return -ENOMEM; 3019 3020 return 0; 3021 } 3022 EXPORT_SYMBOL_GPL(md_rdev_init); 3023 /* 3024 * Import a device. If 'super_format' >= 0, then sanity check the superblock 3025 * 3026 * mark the device faulty if: 3027 * 3028 * - the device is nonexistent (zero size) 3029 * - the device has no valid superblock 3030 * 3031 * a faulty rdev _never_ has rdev->sb set. 3032 */ 3033 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) 3034 { 3035 char b[BDEVNAME_SIZE]; 3036 int err; 3037 struct md_rdev *rdev; 3038 sector_t size; 3039 3040 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); 3041 if (!rdev) { 3042 printk(KERN_ERR "md: could not alloc mem for new device!\n"); 3043 return ERR_PTR(-ENOMEM); 3044 } 3045 3046 err = md_rdev_init(rdev); 3047 if (err) 3048 goto abort_free; 3049 err = alloc_disk_sb(rdev); 3050 if (err) 3051 goto abort_free; 3052 3053 err = lock_rdev(rdev, newdev, super_format == -2); 3054 if (err) 3055 goto abort_free; 3056 3057 kobject_init(&rdev->kobj, &rdev_ktype); 3058 3059 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; 3060 if (!size) { 3061 printk(KERN_WARNING 3062 "md: %s has zero or unknown size, marking faulty!\n", 3063 bdevname(rdev->bdev,b)); 3064 err = -EINVAL; 3065 goto abort_free; 3066 } 3067 3068 if (super_format >= 0) { 3069 err = super_types[super_format]. 3070 load_super(rdev, NULL, super_minor); 3071 if (err == -EINVAL) { 3072 printk(KERN_WARNING 3073 "md: %s does not have a valid v%d.%d " 3074 "superblock, not importing!\n", 3075 bdevname(rdev->bdev,b), 3076 super_format, super_minor); 3077 goto abort_free; 3078 } 3079 if (err < 0) { 3080 printk(KERN_WARNING 3081 "md: could not read %s's sb, not importing!\n", 3082 bdevname(rdev->bdev,b)); 3083 goto abort_free; 3084 } 3085 } 3086 3087 return rdev; 3088 3089 abort_free: 3090 if (rdev->bdev) 3091 unlock_rdev(rdev); 3092 md_rdev_clear(rdev); 3093 kfree(rdev); 3094 return ERR_PTR(err); 3095 } 3096 3097 /* 3098 * Check a full RAID array for plausibility 3099 */ 3100 3101 static void analyze_sbs(struct mddev *mddev) 3102 { 3103 int i; 3104 struct md_rdev *rdev, *freshest, *tmp; 3105 char b[BDEVNAME_SIZE]; 3106 3107 freshest = NULL; 3108 rdev_for_each_safe(rdev, tmp, mddev) 3109 switch (super_types[mddev->major_version]. 3110 load_super(rdev, freshest, mddev->minor_version)) { 3111 case 1: 3112 freshest = rdev; 3113 break; 3114 case 0: 3115 break; 3116 default: 3117 printk( KERN_ERR \ 3118 "md: fatal superblock inconsistency in %s" 3119 " -- removing from array\n", 3120 bdevname(rdev->bdev,b)); 3121 kick_rdev_from_array(rdev); 3122 } 3123 3124 super_types[mddev->major_version]. 3125 validate_super(mddev, freshest); 3126 3127 i = 0; 3128 rdev_for_each_safe(rdev, tmp, mddev) { 3129 if (mddev->max_disks && 3130 (rdev->desc_nr >= mddev->max_disks || 3131 i > mddev->max_disks)) { 3132 printk(KERN_WARNING 3133 "md: %s: %s: only %d devices permitted\n", 3134 mdname(mddev), bdevname(rdev->bdev, b), 3135 mddev->max_disks); 3136 kick_rdev_from_array(rdev); 3137 continue; 3138 } 3139 if (rdev != freshest) 3140 if (super_types[mddev->major_version]. 3141 validate_super(mddev, rdev)) { 3142 printk(KERN_WARNING "md: kicking non-fresh %s" 3143 " from array!\n", 3144 bdevname(rdev->bdev,b)); 3145 kick_rdev_from_array(rdev); 3146 continue; 3147 } 3148 if (mddev->level == LEVEL_MULTIPATH) { 3149 rdev->desc_nr = i++; 3150 rdev->raid_disk = rdev->desc_nr; 3151 set_bit(In_sync, &rdev->flags); 3152 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { 3153 rdev->raid_disk = -1; 3154 clear_bit(In_sync, &rdev->flags); 3155 } 3156 } 3157 } 3158 3159 /* Read a fixed-point number. 3160 * Numbers in sysfs attributes should be in "standard" units where 3161 * possible, so time should be in seconds. 3162 * However we internally use a a much smaller unit such as 3163 * milliseconds or jiffies. 3164 * This function takes a decimal number with a possible fractional 3165 * component, and produces an integer which is the result of 3166 * multiplying that number by 10^'scale'. 3167 * all without any floating-point arithmetic. 3168 */ 3169 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) 3170 { 3171 unsigned long result = 0; 3172 long decimals = -1; 3173 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { 3174 if (*cp == '.') 3175 decimals = 0; 3176 else if (decimals < scale) { 3177 unsigned int value; 3178 value = *cp - '0'; 3179 result = result * 10 + value; 3180 if (decimals >= 0) 3181 decimals++; 3182 } 3183 cp++; 3184 } 3185 if (*cp == '\n') 3186 cp++; 3187 if (*cp) 3188 return -EINVAL; 3189 if (decimals < 0) 3190 decimals = 0; 3191 while (decimals < scale) { 3192 result *= 10; 3193 decimals ++; 3194 } 3195 *res = result; 3196 return 0; 3197 } 3198 3199 static void md_safemode_timeout(unsigned long data); 3200 3201 static ssize_t 3202 safe_delay_show(struct mddev *mddev, char *page) 3203 { 3204 int msec = (mddev->safemode_delay*1000)/HZ; 3205 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); 3206 } 3207 static ssize_t 3208 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) 3209 { 3210 unsigned long msec; 3211 3212 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) 3213 return -EINVAL; 3214 if (msec == 0) 3215 mddev->safemode_delay = 0; 3216 else { 3217 unsigned long old_delay = mddev->safemode_delay; 3218 mddev->safemode_delay = (msec*HZ)/1000; 3219 if (mddev->safemode_delay == 0) 3220 mddev->safemode_delay = 1; 3221 if (mddev->safemode_delay < old_delay || old_delay == 0) 3222 md_safemode_timeout((unsigned long)mddev); 3223 } 3224 return len; 3225 } 3226 static struct md_sysfs_entry md_safe_delay = 3227 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); 3228 3229 static ssize_t 3230 level_show(struct mddev *mddev, char *page) 3231 { 3232 struct md_personality *p = mddev->pers; 3233 if (p) 3234 return sprintf(page, "%s\n", p->name); 3235 else if (mddev->clevel[0]) 3236 return sprintf(page, "%s\n", mddev->clevel); 3237 else if (mddev->level != LEVEL_NONE) 3238 return sprintf(page, "%d\n", mddev->level); 3239 else 3240 return 0; 3241 } 3242 3243 static ssize_t 3244 level_store(struct mddev *mddev, const char *buf, size_t len) 3245 { 3246 char clevel[16]; 3247 ssize_t rv = len; 3248 struct md_personality *pers; 3249 long level; 3250 void *priv; 3251 struct md_rdev *rdev; 3252 3253 if (mddev->pers == NULL) { 3254 if (len == 0) 3255 return 0; 3256 if (len >= sizeof(mddev->clevel)) 3257 return -ENOSPC; 3258 strncpy(mddev->clevel, buf, len); 3259 if (mddev->clevel[len-1] == '\n') 3260 len--; 3261 mddev->clevel[len] = 0; 3262 mddev->level = LEVEL_NONE; 3263 return rv; 3264 } 3265 if (mddev->ro) 3266 return -EROFS; 3267 3268 /* request to change the personality. Need to ensure: 3269 * - array is not engaged in resync/recovery/reshape 3270 * - old personality can be suspended 3271 * - new personality will access other array. 3272 */ 3273 3274 if (mddev->sync_thread || 3275 mddev->reshape_position != MaxSector || 3276 mddev->sysfs_active) 3277 return -EBUSY; 3278 3279 if (!mddev->pers->quiesce) { 3280 printk(KERN_WARNING "md: %s: %s does not support online personality change\n", 3281 mdname(mddev), mddev->pers->name); 3282 return -EINVAL; 3283 } 3284 3285 /* Now find the new personality */ 3286 if (len == 0 || len >= sizeof(clevel)) 3287 return -EINVAL; 3288 strncpy(clevel, buf, len); 3289 if (clevel[len-1] == '\n') 3290 len--; 3291 clevel[len] = 0; 3292 if (kstrtol(clevel, 10, &level)) 3293 level = LEVEL_NONE; 3294 3295 if (request_module("md-%s", clevel) != 0) 3296 request_module("md-level-%s", clevel); 3297 spin_lock(&pers_lock); 3298 pers = find_pers(level, clevel); 3299 if (!pers || !try_module_get(pers->owner)) { 3300 spin_unlock(&pers_lock); 3301 printk(KERN_WARNING "md: personality %s not loaded\n", clevel); 3302 return -EINVAL; 3303 } 3304 spin_unlock(&pers_lock); 3305 3306 if (pers == mddev->pers) { 3307 /* Nothing to do! */ 3308 module_put(pers->owner); 3309 return rv; 3310 } 3311 if (!pers->takeover) { 3312 module_put(pers->owner); 3313 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", 3314 mdname(mddev), clevel); 3315 return -EINVAL; 3316 } 3317 3318 rdev_for_each(rdev, mddev) 3319 rdev->new_raid_disk = rdev->raid_disk; 3320 3321 /* ->takeover must set new_* and/or delta_disks 3322 * if it succeeds, and may set them when it fails. 3323 */ 3324 priv = pers->takeover(mddev); 3325 if (IS_ERR(priv)) { 3326 mddev->new_level = mddev->level; 3327 mddev->new_layout = mddev->layout; 3328 mddev->new_chunk_sectors = mddev->chunk_sectors; 3329 mddev->raid_disks -= mddev->delta_disks; 3330 mddev->delta_disks = 0; 3331 mddev->reshape_backwards = 0; 3332 module_put(pers->owner); 3333 printk(KERN_WARNING "md: %s: %s would not accept array\n", 3334 mdname(mddev), clevel); 3335 return PTR_ERR(priv); 3336 } 3337 3338 /* Looks like we have a winner */ 3339 mddev_suspend(mddev); 3340 mddev->pers->stop(mddev); 3341 3342 if (mddev->pers->sync_request == NULL && 3343 pers->sync_request != NULL) { 3344 /* need to add the md_redundancy_group */ 3345 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 3346 printk(KERN_WARNING 3347 "md: cannot register extra attributes for %s\n", 3348 mdname(mddev)); 3349 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); 3350 } 3351 if (mddev->pers->sync_request != NULL && 3352 pers->sync_request == NULL) { 3353 /* need to remove the md_redundancy_group */ 3354 if (mddev->to_remove == NULL) 3355 mddev->to_remove = &md_redundancy_group; 3356 } 3357 3358 if (mddev->pers->sync_request == NULL && 3359 mddev->external) { 3360 /* We are converting from a no-redundancy array 3361 * to a redundancy array and metadata is managed 3362 * externally so we need to be sure that writes 3363 * won't block due to a need to transition 3364 * clean->dirty 3365 * until external management is started. 3366 */ 3367 mddev->in_sync = 0; 3368 mddev->safemode_delay = 0; 3369 mddev->safemode = 0; 3370 } 3371 3372 rdev_for_each(rdev, mddev) { 3373 if (rdev->raid_disk < 0) 3374 continue; 3375 if (rdev->new_raid_disk >= mddev->raid_disks) 3376 rdev->new_raid_disk = -1; 3377 if (rdev->new_raid_disk == rdev->raid_disk) 3378 continue; 3379 sysfs_unlink_rdev(mddev, rdev); 3380 } 3381 rdev_for_each(rdev, mddev) { 3382 if (rdev->raid_disk < 0) 3383 continue; 3384 if (rdev->new_raid_disk == rdev->raid_disk) 3385 continue; 3386 rdev->raid_disk = rdev->new_raid_disk; 3387 if (rdev->raid_disk < 0) 3388 clear_bit(In_sync, &rdev->flags); 3389 else { 3390 if (sysfs_link_rdev(mddev, rdev)) 3391 printk(KERN_WARNING "md: cannot register rd%d" 3392 " for %s after level change\n", 3393 rdev->raid_disk, mdname(mddev)); 3394 } 3395 } 3396 3397 module_put(mddev->pers->owner); 3398 mddev->pers = pers; 3399 mddev->private = priv; 3400 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 3401 mddev->level = mddev->new_level; 3402 mddev->layout = mddev->new_layout; 3403 mddev->chunk_sectors = mddev->new_chunk_sectors; 3404 mddev->delta_disks = 0; 3405 mddev->reshape_backwards = 0; 3406 mddev->degraded = 0; 3407 if (mddev->pers->sync_request == NULL) { 3408 /* this is now an array without redundancy, so 3409 * it must always be in_sync 3410 */ 3411 mddev->in_sync = 1; 3412 del_timer_sync(&mddev->safemode_timer); 3413 } 3414 blk_set_stacking_limits(&mddev->queue->limits); 3415 pers->run(mddev); 3416 set_bit(MD_CHANGE_DEVS, &mddev->flags); 3417 mddev_resume(mddev); 3418 if (!mddev->thread) 3419 md_update_sb(mddev, 1); 3420 sysfs_notify(&mddev->kobj, NULL, "level"); 3421 md_new_event(mddev); 3422 return rv; 3423 } 3424 3425 static struct md_sysfs_entry md_level = 3426 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); 3427 3428 static ssize_t 3429 layout_show(struct mddev *mddev, char *page) 3430 { 3431 /* just a number, not meaningful for all levels */ 3432 if (mddev->reshape_position != MaxSector && 3433 mddev->layout != mddev->new_layout) 3434 return sprintf(page, "%d (%d)\n", 3435 mddev->new_layout, mddev->layout); 3436 return sprintf(page, "%d\n", mddev->layout); 3437 } 3438 3439 static ssize_t 3440 layout_store(struct mddev *mddev, const char *buf, size_t len) 3441 { 3442 char *e; 3443 unsigned long n = simple_strtoul(buf, &e, 10); 3444 3445 if (!*buf || (*e && *e != '\n')) 3446 return -EINVAL; 3447 3448 if (mddev->pers) { 3449 int err; 3450 if (mddev->pers->check_reshape == NULL) 3451 return -EBUSY; 3452 if (mddev->ro) 3453 return -EROFS; 3454 mddev->new_layout = n; 3455 err = mddev->pers->check_reshape(mddev); 3456 if (err) { 3457 mddev->new_layout = mddev->layout; 3458 return err; 3459 } 3460 } else { 3461 mddev->new_layout = n; 3462 if (mddev->reshape_position == MaxSector) 3463 mddev->layout = n; 3464 } 3465 return len; 3466 } 3467 static struct md_sysfs_entry md_layout = 3468 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); 3469 3470 static ssize_t 3471 raid_disks_show(struct mddev *mddev, char *page) 3472 { 3473 if (mddev->raid_disks == 0) 3474 return 0; 3475 if (mddev->reshape_position != MaxSector && 3476 mddev->delta_disks != 0) 3477 return sprintf(page, "%d (%d)\n", mddev->raid_disks, 3478 mddev->raid_disks - mddev->delta_disks); 3479 return sprintf(page, "%d\n", mddev->raid_disks); 3480 } 3481 3482 static int update_raid_disks(struct mddev *mddev, int raid_disks); 3483 3484 static ssize_t 3485 raid_disks_store(struct mddev *mddev, const char *buf, size_t len) 3486 { 3487 char *e; 3488 int rv = 0; 3489 unsigned long n = simple_strtoul(buf, &e, 10); 3490 3491 if (!*buf || (*e && *e != '\n')) 3492 return -EINVAL; 3493 3494 if (mddev->pers) 3495 rv = update_raid_disks(mddev, n); 3496 else if (mddev->reshape_position != MaxSector) { 3497 struct md_rdev *rdev; 3498 int olddisks = mddev->raid_disks - mddev->delta_disks; 3499 3500 rdev_for_each(rdev, mddev) { 3501 if (olddisks < n && 3502 rdev->data_offset < rdev->new_data_offset) 3503 return -EINVAL; 3504 if (olddisks > n && 3505 rdev->data_offset > rdev->new_data_offset) 3506 return -EINVAL; 3507 } 3508 mddev->delta_disks = n - olddisks; 3509 mddev->raid_disks = n; 3510 mddev->reshape_backwards = (mddev->delta_disks < 0); 3511 } else 3512 mddev->raid_disks = n; 3513 return rv ? rv : len; 3514 } 3515 static struct md_sysfs_entry md_raid_disks = 3516 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); 3517 3518 static ssize_t 3519 chunk_size_show(struct mddev *mddev, char *page) 3520 { 3521 if (mddev->reshape_position != MaxSector && 3522 mddev->chunk_sectors != mddev->new_chunk_sectors) 3523 return sprintf(page, "%d (%d)\n", 3524 mddev->new_chunk_sectors << 9, 3525 mddev->chunk_sectors << 9); 3526 return sprintf(page, "%d\n", mddev->chunk_sectors << 9); 3527 } 3528 3529 static ssize_t 3530 chunk_size_store(struct mddev *mddev, const char *buf, size_t len) 3531 { 3532 char *e; 3533 unsigned long n = simple_strtoul(buf, &e, 10); 3534 3535 if (!*buf || (*e && *e != '\n')) 3536 return -EINVAL; 3537 3538 if (mddev->pers) { 3539 int err; 3540 if (mddev->pers->check_reshape == NULL) 3541 return -EBUSY; 3542 if (mddev->ro) 3543 return -EROFS; 3544 mddev->new_chunk_sectors = n >> 9; 3545 err = mddev->pers->check_reshape(mddev); 3546 if (err) { 3547 mddev->new_chunk_sectors = mddev->chunk_sectors; 3548 return err; 3549 } 3550 } else { 3551 mddev->new_chunk_sectors = n >> 9; 3552 if (mddev->reshape_position == MaxSector) 3553 mddev->chunk_sectors = n >> 9; 3554 } 3555 return len; 3556 } 3557 static struct md_sysfs_entry md_chunk_size = 3558 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); 3559 3560 static ssize_t 3561 resync_start_show(struct mddev *mddev, char *page) 3562 { 3563 if (mddev->recovery_cp == MaxSector) 3564 return sprintf(page, "none\n"); 3565 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); 3566 } 3567 3568 static ssize_t 3569 resync_start_store(struct mddev *mddev, const char *buf, size_t len) 3570 { 3571 char *e; 3572 unsigned long long n = simple_strtoull(buf, &e, 10); 3573 3574 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 3575 return -EBUSY; 3576 if (cmd_match(buf, "none")) 3577 n = MaxSector; 3578 else if (!*buf || (*e && *e != '\n')) 3579 return -EINVAL; 3580 3581 mddev->recovery_cp = n; 3582 if (mddev->pers) 3583 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 3584 return len; 3585 } 3586 static struct md_sysfs_entry md_resync_start = 3587 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); 3588 3589 /* 3590 * The array state can be: 3591 * 3592 * clear 3593 * No devices, no size, no level 3594 * Equivalent to STOP_ARRAY ioctl 3595 * inactive 3596 * May have some settings, but array is not active 3597 * all IO results in error 3598 * When written, doesn't tear down array, but just stops it 3599 * suspended (not supported yet) 3600 * All IO requests will block. The array can be reconfigured. 3601 * Writing this, if accepted, will block until array is quiescent 3602 * readonly 3603 * no resync can happen. no superblocks get written. 3604 * write requests fail 3605 * read-auto 3606 * like readonly, but behaves like 'clean' on a write request. 3607 * 3608 * clean - no pending writes, but otherwise active. 3609 * When written to inactive array, starts without resync 3610 * If a write request arrives then 3611 * if metadata is known, mark 'dirty' and switch to 'active'. 3612 * if not known, block and switch to write-pending 3613 * If written to an active array that has pending writes, then fails. 3614 * active 3615 * fully active: IO and resync can be happening. 3616 * When written to inactive array, starts with resync 3617 * 3618 * write-pending 3619 * clean, but writes are blocked waiting for 'active' to be written. 3620 * 3621 * active-idle 3622 * like active, but no writes have been seen for a while (100msec). 3623 * 3624 */ 3625 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, 3626 write_pending, active_idle, bad_word}; 3627 static char *array_states[] = { 3628 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", 3629 "write-pending", "active-idle", NULL }; 3630 3631 static int match_word(const char *word, char **list) 3632 { 3633 int n; 3634 for (n=0; list[n]; n++) 3635 if (cmd_match(word, list[n])) 3636 break; 3637 return n; 3638 } 3639 3640 static ssize_t 3641 array_state_show(struct mddev *mddev, char *page) 3642 { 3643 enum array_state st = inactive; 3644 3645 if (mddev->pers) 3646 switch(mddev->ro) { 3647 case 1: 3648 st = readonly; 3649 break; 3650 case 2: 3651 st = read_auto; 3652 break; 3653 case 0: 3654 if (mddev->in_sync) 3655 st = clean; 3656 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) 3657 st = write_pending; 3658 else if (mddev->safemode) 3659 st = active_idle; 3660 else 3661 st = active; 3662 } 3663 else { 3664 if (list_empty(&mddev->disks) && 3665 mddev->raid_disks == 0 && 3666 mddev->dev_sectors == 0) 3667 st = clear; 3668 else 3669 st = inactive; 3670 } 3671 return sprintf(page, "%s\n", array_states[st]); 3672 } 3673 3674 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); 3675 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); 3676 static int do_md_run(struct mddev *mddev); 3677 static int restart_array(struct mddev *mddev); 3678 3679 static ssize_t 3680 array_state_store(struct mddev *mddev, const char *buf, size_t len) 3681 { 3682 int err = -EINVAL; 3683 enum array_state st = match_word(buf, array_states); 3684 switch(st) { 3685 case bad_word: 3686 break; 3687 case clear: 3688 /* stopping an active array */ 3689 err = do_md_stop(mddev, 0, NULL); 3690 break; 3691 case inactive: 3692 /* stopping an active array */ 3693 if (mddev->pers) 3694 err = do_md_stop(mddev, 2, NULL); 3695 else 3696 err = 0; /* already inactive */ 3697 break; 3698 case suspended: 3699 break; /* not supported yet */ 3700 case readonly: 3701 if (mddev->pers) 3702 err = md_set_readonly(mddev, NULL); 3703 else { 3704 mddev->ro = 1; 3705 set_disk_ro(mddev->gendisk, 1); 3706 err = do_md_run(mddev); 3707 } 3708 break; 3709 case read_auto: 3710 if (mddev->pers) { 3711 if (mddev->ro == 0) 3712 err = md_set_readonly(mddev, NULL); 3713 else if (mddev->ro == 1) 3714 err = restart_array(mddev); 3715 if (err == 0) { 3716 mddev->ro = 2; 3717 set_disk_ro(mddev->gendisk, 0); 3718 } 3719 } else { 3720 mddev->ro = 2; 3721 err = do_md_run(mddev); 3722 } 3723 break; 3724 case clean: 3725 if (mddev->pers) { 3726 restart_array(mddev); 3727 spin_lock_irq(&mddev->write_lock); 3728 if (atomic_read(&mddev->writes_pending) == 0) { 3729 if (mddev->in_sync == 0) { 3730 mddev->in_sync = 1; 3731 if (mddev->safemode == 1) 3732 mddev->safemode = 0; 3733 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 3734 } 3735 err = 0; 3736 } else 3737 err = -EBUSY; 3738 spin_unlock_irq(&mddev->write_lock); 3739 } else 3740 err = -EINVAL; 3741 break; 3742 case active: 3743 if (mddev->pers) { 3744 restart_array(mddev); 3745 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 3746 wake_up(&mddev->sb_wait); 3747 err = 0; 3748 } else { 3749 mddev->ro = 0; 3750 set_disk_ro(mddev->gendisk, 0); 3751 err = do_md_run(mddev); 3752 } 3753 break; 3754 case write_pending: 3755 case active_idle: 3756 /* these cannot be set */ 3757 break; 3758 } 3759 if (err) 3760 return err; 3761 else { 3762 if (mddev->hold_active == UNTIL_IOCTL) 3763 mddev->hold_active = 0; 3764 sysfs_notify_dirent_safe(mddev->sysfs_state); 3765 return len; 3766 } 3767 } 3768 static struct md_sysfs_entry md_array_state = 3769 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); 3770 3771 static ssize_t 3772 max_corrected_read_errors_show(struct mddev *mddev, char *page) { 3773 return sprintf(page, "%d\n", 3774 atomic_read(&mddev->max_corr_read_errors)); 3775 } 3776 3777 static ssize_t 3778 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) 3779 { 3780 char *e; 3781 unsigned long n = simple_strtoul(buf, &e, 10); 3782 3783 if (*buf && (*e == 0 || *e == '\n')) { 3784 atomic_set(&mddev->max_corr_read_errors, n); 3785 return len; 3786 } 3787 return -EINVAL; 3788 } 3789 3790 static struct md_sysfs_entry max_corr_read_errors = 3791 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, 3792 max_corrected_read_errors_store); 3793 3794 static ssize_t 3795 null_show(struct mddev *mddev, char *page) 3796 { 3797 return -EINVAL; 3798 } 3799 3800 static ssize_t 3801 new_dev_store(struct mddev *mddev, const char *buf, size_t len) 3802 { 3803 /* buf must be %d:%d\n? giving major and minor numbers */ 3804 /* The new device is added to the array. 3805 * If the array has a persistent superblock, we read the 3806 * superblock to initialise info and check validity. 3807 * Otherwise, only checking done is that in bind_rdev_to_array, 3808 * which mainly checks size. 3809 */ 3810 char *e; 3811 int major = simple_strtoul(buf, &e, 10); 3812 int minor; 3813 dev_t dev; 3814 struct md_rdev *rdev; 3815 int err; 3816 3817 if (!*buf || *e != ':' || !e[1] || e[1] == '\n') 3818 return -EINVAL; 3819 minor = simple_strtoul(e+1, &e, 10); 3820 if (*e && *e != '\n') 3821 return -EINVAL; 3822 dev = MKDEV(major, minor); 3823 if (major != MAJOR(dev) || 3824 minor != MINOR(dev)) 3825 return -EOVERFLOW; 3826 3827 if (mddev->persistent) { 3828 rdev = md_import_device(dev, mddev->major_version, 3829 mddev->minor_version); 3830 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { 3831 struct md_rdev *rdev0 3832 = list_entry(mddev->disks.next, 3833 struct md_rdev, same_set); 3834 err = super_types[mddev->major_version] 3835 .load_super(rdev, rdev0, mddev->minor_version); 3836 if (err < 0) 3837 goto out; 3838 } 3839 } else if (mddev->external) 3840 rdev = md_import_device(dev, -2, -1); 3841 else 3842 rdev = md_import_device(dev, -1, -1); 3843 3844 if (IS_ERR(rdev)) 3845 return PTR_ERR(rdev); 3846 err = bind_rdev_to_array(rdev, mddev); 3847 out: 3848 if (err) 3849 export_rdev(rdev); 3850 return err ? err : len; 3851 } 3852 3853 static struct md_sysfs_entry md_new_device = 3854 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); 3855 3856 static ssize_t 3857 bitmap_store(struct mddev *mddev, const char *buf, size_t len) 3858 { 3859 char *end; 3860 unsigned long chunk, end_chunk; 3861 3862 if (!mddev->bitmap) 3863 goto out; 3864 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ 3865 while (*buf) { 3866 chunk = end_chunk = simple_strtoul(buf, &end, 0); 3867 if (buf == end) break; 3868 if (*end == '-') { /* range */ 3869 buf = end + 1; 3870 end_chunk = simple_strtoul(buf, &end, 0); 3871 if (buf == end) break; 3872 } 3873 if (*end && !isspace(*end)) break; 3874 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); 3875 buf = skip_spaces(end); 3876 } 3877 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ 3878 out: 3879 return len; 3880 } 3881 3882 static struct md_sysfs_entry md_bitmap = 3883 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); 3884 3885 static ssize_t 3886 size_show(struct mddev *mddev, char *page) 3887 { 3888 return sprintf(page, "%llu\n", 3889 (unsigned long long)mddev->dev_sectors / 2); 3890 } 3891 3892 static int update_size(struct mddev *mddev, sector_t num_sectors); 3893 3894 static ssize_t 3895 size_store(struct mddev *mddev, const char *buf, size_t len) 3896 { 3897 /* If array is inactive, we can reduce the component size, but 3898 * not increase it (except from 0). 3899 * If array is active, we can try an on-line resize 3900 */ 3901 sector_t sectors; 3902 int err = strict_blocks_to_sectors(buf, §ors); 3903 3904 if (err < 0) 3905 return err; 3906 if (mddev->pers) { 3907 err = update_size(mddev, sectors); 3908 md_update_sb(mddev, 1); 3909 } else { 3910 if (mddev->dev_sectors == 0 || 3911 mddev->dev_sectors > sectors) 3912 mddev->dev_sectors = sectors; 3913 else 3914 err = -ENOSPC; 3915 } 3916 return err ? err : len; 3917 } 3918 3919 static struct md_sysfs_entry md_size = 3920 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); 3921 3922 /* Metadata version. 3923 * This is one of 3924 * 'none' for arrays with no metadata (good luck...) 3925 * 'external' for arrays with externally managed metadata, 3926 * or N.M for internally known formats 3927 */ 3928 static ssize_t 3929 metadata_show(struct mddev *mddev, char *page) 3930 { 3931 if (mddev->persistent) 3932 return sprintf(page, "%d.%d\n", 3933 mddev->major_version, mddev->minor_version); 3934 else if (mddev->external) 3935 return sprintf(page, "external:%s\n", mddev->metadata_type); 3936 else 3937 return sprintf(page, "none\n"); 3938 } 3939 3940 static ssize_t 3941 metadata_store(struct mddev *mddev, const char *buf, size_t len) 3942 { 3943 int major, minor; 3944 char *e; 3945 /* Changing the details of 'external' metadata is 3946 * always permitted. Otherwise there must be 3947 * no devices attached to the array. 3948 */ 3949 if (mddev->external && strncmp(buf, "external:", 9) == 0) 3950 ; 3951 else if (!list_empty(&mddev->disks)) 3952 return -EBUSY; 3953 3954 if (cmd_match(buf, "none")) { 3955 mddev->persistent = 0; 3956 mddev->external = 0; 3957 mddev->major_version = 0; 3958 mddev->minor_version = 90; 3959 return len; 3960 } 3961 if (strncmp(buf, "external:", 9) == 0) { 3962 size_t namelen = len-9; 3963 if (namelen >= sizeof(mddev->metadata_type)) 3964 namelen = sizeof(mddev->metadata_type)-1; 3965 strncpy(mddev->metadata_type, buf+9, namelen); 3966 mddev->metadata_type[namelen] = 0; 3967 if (namelen && mddev->metadata_type[namelen-1] == '\n') 3968 mddev->metadata_type[--namelen] = 0; 3969 mddev->persistent = 0; 3970 mddev->external = 1; 3971 mddev->major_version = 0; 3972 mddev->minor_version = 90; 3973 return len; 3974 } 3975 major = simple_strtoul(buf, &e, 10); 3976 if (e==buf || *e != '.') 3977 return -EINVAL; 3978 buf = e+1; 3979 minor = simple_strtoul(buf, &e, 10); 3980 if (e==buf || (*e && *e != '\n') ) 3981 return -EINVAL; 3982 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) 3983 return -ENOENT; 3984 mddev->major_version = major; 3985 mddev->minor_version = minor; 3986 mddev->persistent = 1; 3987 mddev->external = 0; 3988 return len; 3989 } 3990 3991 static struct md_sysfs_entry md_metadata = 3992 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); 3993 3994 static ssize_t 3995 action_show(struct mddev *mddev, char *page) 3996 { 3997 char *type = "idle"; 3998 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 3999 type = "frozen"; 4000 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 4001 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { 4002 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 4003 type = "reshape"; 4004 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 4005 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 4006 type = "resync"; 4007 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 4008 type = "check"; 4009 else 4010 type = "repair"; 4011 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) 4012 type = "recover"; 4013 } 4014 return sprintf(page, "%s\n", type); 4015 } 4016 4017 static ssize_t 4018 action_store(struct mddev *mddev, const char *page, size_t len) 4019 { 4020 if (!mddev->pers || !mddev->pers->sync_request) 4021 return -EINVAL; 4022 4023 if (cmd_match(page, "frozen")) 4024 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4025 else 4026 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4027 4028 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { 4029 if (mddev->sync_thread) { 4030 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4031 md_reap_sync_thread(mddev); 4032 } 4033 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 4034 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 4035 return -EBUSY; 4036 else if (cmd_match(page, "resync")) 4037 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4038 else if (cmd_match(page, "recover")) { 4039 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 4040 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4041 } else if (cmd_match(page, "reshape")) { 4042 int err; 4043 if (mddev->pers->start_reshape == NULL) 4044 return -EINVAL; 4045 err = mddev->pers->start_reshape(mddev); 4046 if (err) 4047 return err; 4048 sysfs_notify(&mddev->kobj, NULL, "degraded"); 4049 } else { 4050 if (cmd_match(page, "check")) 4051 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4052 else if (!cmd_match(page, "repair")) 4053 return -EINVAL; 4054 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 4055 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4056 } 4057 if (mddev->ro == 2) { 4058 /* A write to sync_action is enough to justify 4059 * canceling read-auto mode 4060 */ 4061 mddev->ro = 0; 4062 md_wakeup_thread(mddev->sync_thread); 4063 } 4064 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4065 md_wakeup_thread(mddev->thread); 4066 sysfs_notify_dirent_safe(mddev->sysfs_action); 4067 return len; 4068 } 4069 4070 static struct md_sysfs_entry md_scan_mode = 4071 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 4072 4073 static ssize_t 4074 last_sync_action_show(struct mddev *mddev, char *page) 4075 { 4076 return sprintf(page, "%s\n", mddev->last_sync_action); 4077 } 4078 4079 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); 4080 4081 static ssize_t 4082 mismatch_cnt_show(struct mddev *mddev, char *page) 4083 { 4084 return sprintf(page, "%llu\n", 4085 (unsigned long long) 4086 atomic64_read(&mddev->resync_mismatches)); 4087 } 4088 4089 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); 4090 4091 static ssize_t 4092 sync_min_show(struct mddev *mddev, char *page) 4093 { 4094 return sprintf(page, "%d (%s)\n", speed_min(mddev), 4095 mddev->sync_speed_min ? "local": "system"); 4096 } 4097 4098 static ssize_t 4099 sync_min_store(struct mddev *mddev, const char *buf, size_t len) 4100 { 4101 int min; 4102 char *e; 4103 if (strncmp(buf, "system", 6)==0) { 4104 mddev->sync_speed_min = 0; 4105 return len; 4106 } 4107 min = simple_strtoul(buf, &e, 10); 4108 if (buf == e || (*e && *e != '\n') || min <= 0) 4109 return -EINVAL; 4110 mddev->sync_speed_min = min; 4111 return len; 4112 } 4113 4114 static struct md_sysfs_entry md_sync_min = 4115 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); 4116 4117 static ssize_t 4118 sync_max_show(struct mddev *mddev, char *page) 4119 { 4120 return sprintf(page, "%d (%s)\n", speed_max(mddev), 4121 mddev->sync_speed_max ? "local": "system"); 4122 } 4123 4124 static ssize_t 4125 sync_max_store(struct mddev *mddev, const char *buf, size_t len) 4126 { 4127 int max; 4128 char *e; 4129 if (strncmp(buf, "system", 6)==0) { 4130 mddev->sync_speed_max = 0; 4131 return len; 4132 } 4133 max = simple_strtoul(buf, &e, 10); 4134 if (buf == e || (*e && *e != '\n') || max <= 0) 4135 return -EINVAL; 4136 mddev->sync_speed_max = max; 4137 return len; 4138 } 4139 4140 static struct md_sysfs_entry md_sync_max = 4141 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); 4142 4143 static ssize_t 4144 degraded_show(struct mddev *mddev, char *page) 4145 { 4146 return sprintf(page, "%d\n", mddev->degraded); 4147 } 4148 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); 4149 4150 static ssize_t 4151 sync_force_parallel_show(struct mddev *mddev, char *page) 4152 { 4153 return sprintf(page, "%d\n", mddev->parallel_resync); 4154 } 4155 4156 static ssize_t 4157 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) 4158 { 4159 long n; 4160 4161 if (kstrtol(buf, 10, &n)) 4162 return -EINVAL; 4163 4164 if (n != 0 && n != 1) 4165 return -EINVAL; 4166 4167 mddev->parallel_resync = n; 4168 4169 if (mddev->sync_thread) 4170 wake_up(&resync_wait); 4171 4172 return len; 4173 } 4174 4175 /* force parallel resync, even with shared block devices */ 4176 static struct md_sysfs_entry md_sync_force_parallel = 4177 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, 4178 sync_force_parallel_show, sync_force_parallel_store); 4179 4180 static ssize_t 4181 sync_speed_show(struct mddev *mddev, char *page) 4182 { 4183 unsigned long resync, dt, db; 4184 if (mddev->curr_resync == 0) 4185 return sprintf(page, "none\n"); 4186 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); 4187 dt = (jiffies - mddev->resync_mark) / HZ; 4188 if (!dt) dt++; 4189 db = resync - mddev->resync_mark_cnt; 4190 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ 4191 } 4192 4193 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); 4194 4195 static ssize_t 4196 sync_completed_show(struct mddev *mddev, char *page) 4197 { 4198 unsigned long long max_sectors, resync; 4199 4200 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4201 return sprintf(page, "none\n"); 4202 4203 if (mddev->curr_resync == 1 || 4204 mddev->curr_resync == 2) 4205 return sprintf(page, "delayed\n"); 4206 4207 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 4208 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 4209 max_sectors = mddev->resync_max_sectors; 4210 else 4211 max_sectors = mddev->dev_sectors; 4212 4213 resync = mddev->curr_resync_completed; 4214 return sprintf(page, "%llu / %llu\n", resync, max_sectors); 4215 } 4216 4217 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); 4218 4219 static ssize_t 4220 min_sync_show(struct mddev *mddev, char *page) 4221 { 4222 return sprintf(page, "%llu\n", 4223 (unsigned long long)mddev->resync_min); 4224 } 4225 static ssize_t 4226 min_sync_store(struct mddev *mddev, const char *buf, size_t len) 4227 { 4228 unsigned long long min; 4229 if (kstrtoull(buf, 10, &min)) 4230 return -EINVAL; 4231 if (min > mddev->resync_max) 4232 return -EINVAL; 4233 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4234 return -EBUSY; 4235 4236 /* Must be a multiple of chunk_size */ 4237 if (mddev->chunk_sectors) { 4238 sector_t temp = min; 4239 if (sector_div(temp, mddev->chunk_sectors)) 4240 return -EINVAL; 4241 } 4242 mddev->resync_min = min; 4243 4244 return len; 4245 } 4246 4247 static struct md_sysfs_entry md_min_sync = 4248 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); 4249 4250 static ssize_t 4251 max_sync_show(struct mddev *mddev, char *page) 4252 { 4253 if (mddev->resync_max == MaxSector) 4254 return sprintf(page, "max\n"); 4255 else 4256 return sprintf(page, "%llu\n", 4257 (unsigned long long)mddev->resync_max); 4258 } 4259 static ssize_t 4260 max_sync_store(struct mddev *mddev, const char *buf, size_t len) 4261 { 4262 if (strncmp(buf, "max", 3) == 0) 4263 mddev->resync_max = MaxSector; 4264 else { 4265 unsigned long long max; 4266 if (kstrtoull(buf, 10, &max)) 4267 return -EINVAL; 4268 if (max < mddev->resync_min) 4269 return -EINVAL; 4270 if (max < mddev->resync_max && 4271 mddev->ro == 0 && 4272 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4273 return -EBUSY; 4274 4275 /* Must be a multiple of chunk_size */ 4276 if (mddev->chunk_sectors) { 4277 sector_t temp = max; 4278 if (sector_div(temp, mddev->chunk_sectors)) 4279 return -EINVAL; 4280 } 4281 mddev->resync_max = max; 4282 } 4283 wake_up(&mddev->recovery_wait); 4284 return len; 4285 } 4286 4287 static struct md_sysfs_entry md_max_sync = 4288 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); 4289 4290 static ssize_t 4291 suspend_lo_show(struct mddev *mddev, char *page) 4292 { 4293 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); 4294 } 4295 4296 static ssize_t 4297 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) 4298 { 4299 char *e; 4300 unsigned long long new = simple_strtoull(buf, &e, 10); 4301 unsigned long long old = mddev->suspend_lo; 4302 4303 if (mddev->pers == NULL || 4304 mddev->pers->quiesce == NULL) 4305 return -EINVAL; 4306 if (buf == e || (*e && *e != '\n')) 4307 return -EINVAL; 4308 4309 mddev->suspend_lo = new; 4310 if (new >= old) 4311 /* Shrinking suspended region */ 4312 mddev->pers->quiesce(mddev, 2); 4313 else { 4314 /* Expanding suspended region - need to wait */ 4315 mddev->pers->quiesce(mddev, 1); 4316 mddev->pers->quiesce(mddev, 0); 4317 } 4318 return len; 4319 } 4320 static struct md_sysfs_entry md_suspend_lo = 4321 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); 4322 4323 static ssize_t 4324 suspend_hi_show(struct mddev *mddev, char *page) 4325 { 4326 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); 4327 } 4328 4329 static ssize_t 4330 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) 4331 { 4332 char *e; 4333 unsigned long long new = simple_strtoull(buf, &e, 10); 4334 unsigned long long old = mddev->suspend_hi; 4335 4336 if (mddev->pers == NULL || 4337 mddev->pers->quiesce == NULL) 4338 return -EINVAL; 4339 if (buf == e || (*e && *e != '\n')) 4340 return -EINVAL; 4341 4342 mddev->suspend_hi = new; 4343 if (new <= old) 4344 /* Shrinking suspended region */ 4345 mddev->pers->quiesce(mddev, 2); 4346 else { 4347 /* Expanding suspended region - need to wait */ 4348 mddev->pers->quiesce(mddev, 1); 4349 mddev->pers->quiesce(mddev, 0); 4350 } 4351 return len; 4352 } 4353 static struct md_sysfs_entry md_suspend_hi = 4354 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); 4355 4356 static ssize_t 4357 reshape_position_show(struct mddev *mddev, char *page) 4358 { 4359 if (mddev->reshape_position != MaxSector) 4360 return sprintf(page, "%llu\n", 4361 (unsigned long long)mddev->reshape_position); 4362 strcpy(page, "none\n"); 4363 return 5; 4364 } 4365 4366 static ssize_t 4367 reshape_position_store(struct mddev *mddev, const char *buf, size_t len) 4368 { 4369 struct md_rdev *rdev; 4370 char *e; 4371 unsigned long long new = simple_strtoull(buf, &e, 10); 4372 if (mddev->pers) 4373 return -EBUSY; 4374 if (buf == e || (*e && *e != '\n')) 4375 return -EINVAL; 4376 mddev->reshape_position = new; 4377 mddev->delta_disks = 0; 4378 mddev->reshape_backwards = 0; 4379 mddev->new_level = mddev->level; 4380 mddev->new_layout = mddev->layout; 4381 mddev->new_chunk_sectors = mddev->chunk_sectors; 4382 rdev_for_each(rdev, mddev) 4383 rdev->new_data_offset = rdev->data_offset; 4384 return len; 4385 } 4386 4387 static struct md_sysfs_entry md_reshape_position = 4388 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, 4389 reshape_position_store); 4390 4391 static ssize_t 4392 reshape_direction_show(struct mddev *mddev, char *page) 4393 { 4394 return sprintf(page, "%s\n", 4395 mddev->reshape_backwards ? "backwards" : "forwards"); 4396 } 4397 4398 static ssize_t 4399 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) 4400 { 4401 int backwards = 0; 4402 if (cmd_match(buf, "forwards")) 4403 backwards = 0; 4404 else if (cmd_match(buf, "backwards")) 4405 backwards = 1; 4406 else 4407 return -EINVAL; 4408 if (mddev->reshape_backwards == backwards) 4409 return len; 4410 4411 /* check if we are allowed to change */ 4412 if (mddev->delta_disks) 4413 return -EBUSY; 4414 4415 if (mddev->persistent && 4416 mddev->major_version == 0) 4417 return -EINVAL; 4418 4419 mddev->reshape_backwards = backwards; 4420 return len; 4421 } 4422 4423 static struct md_sysfs_entry md_reshape_direction = 4424 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, 4425 reshape_direction_store); 4426 4427 static ssize_t 4428 array_size_show(struct mddev *mddev, char *page) 4429 { 4430 if (mddev->external_size) 4431 return sprintf(page, "%llu\n", 4432 (unsigned long long)mddev->array_sectors/2); 4433 else 4434 return sprintf(page, "default\n"); 4435 } 4436 4437 static ssize_t 4438 array_size_store(struct mddev *mddev, const char *buf, size_t len) 4439 { 4440 sector_t sectors; 4441 4442 if (strncmp(buf, "default", 7) == 0) { 4443 if (mddev->pers) 4444 sectors = mddev->pers->size(mddev, 0, 0); 4445 else 4446 sectors = mddev->array_sectors; 4447 4448 mddev->external_size = 0; 4449 } else { 4450 if (strict_blocks_to_sectors(buf, §ors) < 0) 4451 return -EINVAL; 4452 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) 4453 return -E2BIG; 4454 4455 mddev->external_size = 1; 4456 } 4457 4458 mddev->array_sectors = sectors; 4459 if (mddev->pers) { 4460 set_capacity(mddev->gendisk, mddev->array_sectors); 4461 revalidate_disk(mddev->gendisk); 4462 } 4463 return len; 4464 } 4465 4466 static struct md_sysfs_entry md_array_size = 4467 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, 4468 array_size_store); 4469 4470 static struct attribute *md_default_attrs[] = { 4471 &md_level.attr, 4472 &md_layout.attr, 4473 &md_raid_disks.attr, 4474 &md_chunk_size.attr, 4475 &md_size.attr, 4476 &md_resync_start.attr, 4477 &md_metadata.attr, 4478 &md_new_device.attr, 4479 &md_safe_delay.attr, 4480 &md_array_state.attr, 4481 &md_reshape_position.attr, 4482 &md_reshape_direction.attr, 4483 &md_array_size.attr, 4484 &max_corr_read_errors.attr, 4485 NULL, 4486 }; 4487 4488 static struct attribute *md_redundancy_attrs[] = { 4489 &md_scan_mode.attr, 4490 &md_last_scan_mode.attr, 4491 &md_mismatches.attr, 4492 &md_sync_min.attr, 4493 &md_sync_max.attr, 4494 &md_sync_speed.attr, 4495 &md_sync_force_parallel.attr, 4496 &md_sync_completed.attr, 4497 &md_min_sync.attr, 4498 &md_max_sync.attr, 4499 &md_suspend_lo.attr, 4500 &md_suspend_hi.attr, 4501 &md_bitmap.attr, 4502 &md_degraded.attr, 4503 NULL, 4504 }; 4505 static struct attribute_group md_redundancy_group = { 4506 .name = NULL, 4507 .attrs = md_redundancy_attrs, 4508 }; 4509 4510 static ssize_t 4511 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 4512 { 4513 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 4514 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 4515 ssize_t rv; 4516 4517 if (!entry->show) 4518 return -EIO; 4519 spin_lock(&all_mddevs_lock); 4520 if (list_empty(&mddev->all_mddevs)) { 4521 spin_unlock(&all_mddevs_lock); 4522 return -EBUSY; 4523 } 4524 mddev_get(mddev); 4525 spin_unlock(&all_mddevs_lock); 4526 4527 rv = mddev_lock(mddev); 4528 if (!rv) { 4529 rv = entry->show(mddev, page); 4530 mddev_unlock(mddev); 4531 } 4532 mddev_put(mddev); 4533 return rv; 4534 } 4535 4536 static ssize_t 4537 md_attr_store(struct kobject *kobj, struct attribute *attr, 4538 const char *page, size_t length) 4539 { 4540 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 4541 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 4542 ssize_t rv; 4543 4544 if (!entry->store) 4545 return -EIO; 4546 if (!capable(CAP_SYS_ADMIN)) 4547 return -EACCES; 4548 spin_lock(&all_mddevs_lock); 4549 if (list_empty(&mddev->all_mddevs)) { 4550 spin_unlock(&all_mddevs_lock); 4551 return -EBUSY; 4552 } 4553 mddev_get(mddev); 4554 spin_unlock(&all_mddevs_lock); 4555 if (entry->store == new_dev_store) 4556 flush_workqueue(md_misc_wq); 4557 rv = mddev_lock(mddev); 4558 if (!rv) { 4559 rv = entry->store(mddev, page, length); 4560 mddev_unlock(mddev); 4561 } 4562 mddev_put(mddev); 4563 return rv; 4564 } 4565 4566 static void md_free(struct kobject *ko) 4567 { 4568 struct mddev *mddev = container_of(ko, struct mddev, kobj); 4569 4570 if (mddev->sysfs_state) 4571 sysfs_put(mddev->sysfs_state); 4572 4573 if (mddev->gendisk) { 4574 del_gendisk(mddev->gendisk); 4575 put_disk(mddev->gendisk); 4576 } 4577 if (mddev->queue) 4578 blk_cleanup_queue(mddev->queue); 4579 4580 kfree(mddev); 4581 } 4582 4583 static const struct sysfs_ops md_sysfs_ops = { 4584 .show = md_attr_show, 4585 .store = md_attr_store, 4586 }; 4587 static struct kobj_type md_ktype = { 4588 .release = md_free, 4589 .sysfs_ops = &md_sysfs_ops, 4590 .default_attrs = md_default_attrs, 4591 }; 4592 4593 int mdp_major = 0; 4594 4595 static void mddev_delayed_delete(struct work_struct *ws) 4596 { 4597 struct mddev *mddev = container_of(ws, struct mddev, del_work); 4598 4599 sysfs_remove_group(&mddev->kobj, &md_bitmap_group); 4600 kobject_del(&mddev->kobj); 4601 kobject_put(&mddev->kobj); 4602 } 4603 4604 static int md_alloc(dev_t dev, char *name) 4605 { 4606 static DEFINE_MUTEX(disks_mutex); 4607 struct mddev *mddev = mddev_find(dev); 4608 struct gendisk *disk; 4609 int partitioned; 4610 int shift; 4611 int unit; 4612 int error; 4613 4614 if (!mddev) 4615 return -ENODEV; 4616 4617 partitioned = (MAJOR(mddev->unit) != MD_MAJOR); 4618 shift = partitioned ? MdpMinorShift : 0; 4619 unit = MINOR(mddev->unit) >> shift; 4620 4621 /* wait for any previous instance of this device to be 4622 * completely removed (mddev_delayed_delete). 4623 */ 4624 flush_workqueue(md_misc_wq); 4625 4626 mutex_lock(&disks_mutex); 4627 error = -EEXIST; 4628 if (mddev->gendisk) 4629 goto abort; 4630 4631 if (name) { 4632 /* Need to ensure that 'name' is not a duplicate. 4633 */ 4634 struct mddev *mddev2; 4635 spin_lock(&all_mddevs_lock); 4636 4637 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) 4638 if (mddev2->gendisk && 4639 strcmp(mddev2->gendisk->disk_name, name) == 0) { 4640 spin_unlock(&all_mddevs_lock); 4641 goto abort; 4642 } 4643 spin_unlock(&all_mddevs_lock); 4644 } 4645 4646 error = -ENOMEM; 4647 mddev->queue = blk_alloc_queue(GFP_KERNEL); 4648 if (!mddev->queue) 4649 goto abort; 4650 mddev->queue->queuedata = mddev; 4651 4652 blk_queue_make_request(mddev->queue, md_make_request); 4653 blk_set_stacking_limits(&mddev->queue->limits); 4654 4655 disk = alloc_disk(1 << shift); 4656 if (!disk) { 4657 blk_cleanup_queue(mddev->queue); 4658 mddev->queue = NULL; 4659 goto abort; 4660 } 4661 disk->major = MAJOR(mddev->unit); 4662 disk->first_minor = unit << shift; 4663 if (name) 4664 strcpy(disk->disk_name, name); 4665 else if (partitioned) 4666 sprintf(disk->disk_name, "md_d%d", unit); 4667 else 4668 sprintf(disk->disk_name, "md%d", unit); 4669 disk->fops = &md_fops; 4670 disk->private_data = mddev; 4671 disk->queue = mddev->queue; 4672 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); 4673 /* Allow extended partitions. This makes the 4674 * 'mdp' device redundant, but we can't really 4675 * remove it now. 4676 */ 4677 disk->flags |= GENHD_FL_EXT_DEVT; 4678 mddev->gendisk = disk; 4679 /* As soon as we call add_disk(), another thread could get 4680 * through to md_open, so make sure it doesn't get too far 4681 */ 4682 mutex_lock(&mddev->open_mutex); 4683 add_disk(disk); 4684 4685 error = kobject_init_and_add(&mddev->kobj, &md_ktype, 4686 &disk_to_dev(disk)->kobj, "%s", "md"); 4687 if (error) { 4688 /* This isn't possible, but as kobject_init_and_add is marked 4689 * __must_check, we must do something with the result 4690 */ 4691 printk(KERN_WARNING "md: cannot register %s/md - name in use\n", 4692 disk->disk_name); 4693 error = 0; 4694 } 4695 if (mddev->kobj.sd && 4696 sysfs_create_group(&mddev->kobj, &md_bitmap_group)) 4697 printk(KERN_DEBUG "pointless warning\n"); 4698 mutex_unlock(&mddev->open_mutex); 4699 abort: 4700 mutex_unlock(&disks_mutex); 4701 if (!error && mddev->kobj.sd) { 4702 kobject_uevent(&mddev->kobj, KOBJ_ADD); 4703 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); 4704 } 4705 mddev_put(mddev); 4706 return error; 4707 } 4708 4709 static struct kobject *md_probe(dev_t dev, int *part, void *data) 4710 { 4711 md_alloc(dev, NULL); 4712 return NULL; 4713 } 4714 4715 static int add_named_array(const char *val, struct kernel_param *kp) 4716 { 4717 /* val must be "md_*" where * is not all digits. 4718 * We allocate an array with a large free minor number, and 4719 * set the name to val. val must not already be an active name. 4720 */ 4721 int len = strlen(val); 4722 char buf[DISK_NAME_LEN]; 4723 4724 while (len && val[len-1] == '\n') 4725 len--; 4726 if (len >= DISK_NAME_LEN) 4727 return -E2BIG; 4728 strlcpy(buf, val, len+1); 4729 if (strncmp(buf, "md_", 3) != 0) 4730 return -EINVAL; 4731 return md_alloc(0, buf); 4732 } 4733 4734 static void md_safemode_timeout(unsigned long data) 4735 { 4736 struct mddev *mddev = (struct mddev *) data; 4737 4738 if (!atomic_read(&mddev->writes_pending)) { 4739 mddev->safemode = 1; 4740 if (mddev->external) 4741 sysfs_notify_dirent_safe(mddev->sysfs_state); 4742 } 4743 md_wakeup_thread(mddev->thread); 4744 } 4745 4746 static int start_dirty_degraded; 4747 4748 int md_run(struct mddev *mddev) 4749 { 4750 int err; 4751 struct md_rdev *rdev; 4752 struct md_personality *pers; 4753 4754 if (list_empty(&mddev->disks)) 4755 /* cannot run an array with no devices.. */ 4756 return -EINVAL; 4757 4758 if (mddev->pers) 4759 return -EBUSY; 4760 /* Cannot run until previous stop completes properly */ 4761 if (mddev->sysfs_active) 4762 return -EBUSY; 4763 4764 /* 4765 * Analyze all RAID superblock(s) 4766 */ 4767 if (!mddev->raid_disks) { 4768 if (!mddev->persistent) 4769 return -EINVAL; 4770 analyze_sbs(mddev); 4771 } 4772 4773 if (mddev->level != LEVEL_NONE) 4774 request_module("md-level-%d", mddev->level); 4775 else if (mddev->clevel[0]) 4776 request_module("md-%s", mddev->clevel); 4777 4778 /* 4779 * Drop all container device buffers, from now on 4780 * the only valid external interface is through the md 4781 * device. 4782 */ 4783 rdev_for_each(rdev, mddev) { 4784 if (test_bit(Faulty, &rdev->flags)) 4785 continue; 4786 sync_blockdev(rdev->bdev); 4787 invalidate_bdev(rdev->bdev); 4788 4789 /* perform some consistency tests on the device. 4790 * We don't want the data to overlap the metadata, 4791 * Internal Bitmap issues have been handled elsewhere. 4792 */ 4793 if (rdev->meta_bdev) { 4794 /* Nothing to check */; 4795 } else if (rdev->data_offset < rdev->sb_start) { 4796 if (mddev->dev_sectors && 4797 rdev->data_offset + mddev->dev_sectors 4798 > rdev->sb_start) { 4799 printk("md: %s: data overlaps metadata\n", 4800 mdname(mddev)); 4801 return -EINVAL; 4802 } 4803 } else { 4804 if (rdev->sb_start + rdev->sb_size/512 4805 > rdev->data_offset) { 4806 printk("md: %s: metadata overlaps data\n", 4807 mdname(mddev)); 4808 return -EINVAL; 4809 } 4810 } 4811 sysfs_notify_dirent_safe(rdev->sysfs_state); 4812 } 4813 4814 if (mddev->bio_set == NULL) 4815 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); 4816 4817 spin_lock(&pers_lock); 4818 pers = find_pers(mddev->level, mddev->clevel); 4819 if (!pers || !try_module_get(pers->owner)) { 4820 spin_unlock(&pers_lock); 4821 if (mddev->level != LEVEL_NONE) 4822 printk(KERN_WARNING "md: personality for level %d is not loaded!\n", 4823 mddev->level); 4824 else 4825 printk(KERN_WARNING "md: personality for level %s is not loaded!\n", 4826 mddev->clevel); 4827 return -EINVAL; 4828 } 4829 mddev->pers = pers; 4830 spin_unlock(&pers_lock); 4831 if (mddev->level != pers->level) { 4832 mddev->level = pers->level; 4833 mddev->new_level = pers->level; 4834 } 4835 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 4836 4837 if (mddev->reshape_position != MaxSector && 4838 pers->start_reshape == NULL) { 4839 /* This personality cannot handle reshaping... */ 4840 mddev->pers = NULL; 4841 module_put(pers->owner); 4842 return -EINVAL; 4843 } 4844 4845 if (pers->sync_request) { 4846 /* Warn if this is a potentially silly 4847 * configuration. 4848 */ 4849 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 4850 struct md_rdev *rdev2; 4851 int warned = 0; 4852 4853 rdev_for_each(rdev, mddev) 4854 rdev_for_each(rdev2, mddev) { 4855 if (rdev < rdev2 && 4856 rdev->bdev->bd_contains == 4857 rdev2->bdev->bd_contains) { 4858 printk(KERN_WARNING 4859 "%s: WARNING: %s appears to be" 4860 " on the same physical disk as" 4861 " %s.\n", 4862 mdname(mddev), 4863 bdevname(rdev->bdev,b), 4864 bdevname(rdev2->bdev,b2)); 4865 warned = 1; 4866 } 4867 } 4868 4869 if (warned) 4870 printk(KERN_WARNING 4871 "True protection against single-disk" 4872 " failure might be compromised.\n"); 4873 } 4874 4875 mddev->recovery = 0; 4876 /* may be over-ridden by personality */ 4877 mddev->resync_max_sectors = mddev->dev_sectors; 4878 4879 mddev->ok_start_degraded = start_dirty_degraded; 4880 4881 if (start_readonly && mddev->ro == 0) 4882 mddev->ro = 2; /* read-only, but switch on first write */ 4883 4884 err = mddev->pers->run(mddev); 4885 if (err) 4886 printk(KERN_ERR "md: pers->run() failed ...\n"); 4887 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { 4888 WARN_ONCE(!mddev->external_size, "%s: default size too small," 4889 " but 'external_size' not in effect?\n", __func__); 4890 printk(KERN_ERR 4891 "md: invalid array_size %llu > default size %llu\n", 4892 (unsigned long long)mddev->array_sectors / 2, 4893 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); 4894 err = -EINVAL; 4895 mddev->pers->stop(mddev); 4896 } 4897 if (err == 0 && mddev->pers->sync_request && 4898 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { 4899 err = bitmap_create(mddev); 4900 if (err) { 4901 printk(KERN_ERR "%s: failed to create bitmap (%d)\n", 4902 mdname(mddev), err); 4903 mddev->pers->stop(mddev); 4904 } 4905 } 4906 if (err) { 4907 module_put(mddev->pers->owner); 4908 mddev->pers = NULL; 4909 bitmap_destroy(mddev); 4910 return err; 4911 } 4912 if (mddev->pers->sync_request) { 4913 if (mddev->kobj.sd && 4914 sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 4915 printk(KERN_WARNING 4916 "md: cannot register extra attributes for %s\n", 4917 mdname(mddev)); 4918 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); 4919 } else if (mddev->ro == 2) /* auto-readonly not meaningful */ 4920 mddev->ro = 0; 4921 4922 atomic_set(&mddev->writes_pending,0); 4923 atomic_set(&mddev->max_corr_read_errors, 4924 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); 4925 mddev->safemode = 0; 4926 mddev->safemode_timer.function = md_safemode_timeout; 4927 mddev->safemode_timer.data = (unsigned long) mddev; 4928 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ 4929 mddev->in_sync = 1; 4930 smp_wmb(); 4931 mddev->ready = 1; 4932 rdev_for_each(rdev, mddev) 4933 if (rdev->raid_disk >= 0) 4934 if (sysfs_link_rdev(mddev, rdev)) 4935 /* failure here is OK */; 4936 4937 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4938 4939 if (mddev->flags & MD_UPDATE_SB_FLAGS) 4940 md_update_sb(mddev, 0); 4941 4942 md_new_event(mddev); 4943 sysfs_notify_dirent_safe(mddev->sysfs_state); 4944 sysfs_notify_dirent_safe(mddev->sysfs_action); 4945 sysfs_notify(&mddev->kobj, NULL, "degraded"); 4946 return 0; 4947 } 4948 EXPORT_SYMBOL_GPL(md_run); 4949 4950 static int do_md_run(struct mddev *mddev) 4951 { 4952 int err; 4953 4954 err = md_run(mddev); 4955 if (err) 4956 goto out; 4957 err = bitmap_load(mddev); 4958 if (err) { 4959 bitmap_destroy(mddev); 4960 goto out; 4961 } 4962 4963 md_wakeup_thread(mddev->thread); 4964 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 4965 4966 set_capacity(mddev->gendisk, mddev->array_sectors); 4967 revalidate_disk(mddev->gendisk); 4968 mddev->changed = 1; 4969 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 4970 out: 4971 return err; 4972 } 4973 4974 static int restart_array(struct mddev *mddev) 4975 { 4976 struct gendisk *disk = mddev->gendisk; 4977 4978 /* Complain if it has no devices */ 4979 if (list_empty(&mddev->disks)) 4980 return -ENXIO; 4981 if (!mddev->pers) 4982 return -EINVAL; 4983 if (!mddev->ro) 4984 return -EBUSY; 4985 mddev->safemode = 0; 4986 mddev->ro = 0; 4987 set_disk_ro(disk, 0); 4988 printk(KERN_INFO "md: %s switched to read-write mode.\n", 4989 mdname(mddev)); 4990 /* Kick recovery or resync if necessary */ 4991 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4992 md_wakeup_thread(mddev->thread); 4993 md_wakeup_thread(mddev->sync_thread); 4994 sysfs_notify_dirent_safe(mddev->sysfs_state); 4995 return 0; 4996 } 4997 4998 static void md_clean(struct mddev *mddev) 4999 { 5000 mddev->array_sectors = 0; 5001 mddev->external_size = 0; 5002 mddev->dev_sectors = 0; 5003 mddev->raid_disks = 0; 5004 mddev->recovery_cp = 0; 5005 mddev->resync_min = 0; 5006 mddev->resync_max = MaxSector; 5007 mddev->reshape_position = MaxSector; 5008 mddev->external = 0; 5009 mddev->persistent = 0; 5010 mddev->level = LEVEL_NONE; 5011 mddev->clevel[0] = 0; 5012 mddev->flags = 0; 5013 mddev->ro = 0; 5014 mddev->metadata_type[0] = 0; 5015 mddev->chunk_sectors = 0; 5016 mddev->ctime = mddev->utime = 0; 5017 mddev->layout = 0; 5018 mddev->max_disks = 0; 5019 mddev->events = 0; 5020 mddev->can_decrease_events = 0; 5021 mddev->delta_disks = 0; 5022 mddev->reshape_backwards = 0; 5023 mddev->new_level = LEVEL_NONE; 5024 mddev->new_layout = 0; 5025 mddev->new_chunk_sectors = 0; 5026 mddev->curr_resync = 0; 5027 atomic64_set(&mddev->resync_mismatches, 0); 5028 mddev->suspend_lo = mddev->suspend_hi = 0; 5029 mddev->sync_speed_min = mddev->sync_speed_max = 0; 5030 mddev->recovery = 0; 5031 mddev->in_sync = 0; 5032 mddev->changed = 0; 5033 mddev->degraded = 0; 5034 mddev->safemode = 0; 5035 mddev->merge_check_needed = 0; 5036 mddev->bitmap_info.offset = 0; 5037 mddev->bitmap_info.default_offset = 0; 5038 mddev->bitmap_info.default_space = 0; 5039 mddev->bitmap_info.chunksize = 0; 5040 mddev->bitmap_info.daemon_sleep = 0; 5041 mddev->bitmap_info.max_write_behind = 0; 5042 } 5043 5044 static void __md_stop_writes(struct mddev *mddev) 5045 { 5046 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5047 if (mddev->sync_thread) { 5048 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5049 md_reap_sync_thread(mddev); 5050 } 5051 5052 del_timer_sync(&mddev->safemode_timer); 5053 5054 bitmap_flush(mddev); 5055 md_super_wait(mddev); 5056 5057 if (mddev->ro == 0 && 5058 (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { 5059 /* mark array as shutdown cleanly */ 5060 mddev->in_sync = 1; 5061 md_update_sb(mddev, 1); 5062 } 5063 } 5064 5065 void md_stop_writes(struct mddev *mddev) 5066 { 5067 mddev_lock_nointr(mddev); 5068 __md_stop_writes(mddev); 5069 mddev_unlock(mddev); 5070 } 5071 EXPORT_SYMBOL_GPL(md_stop_writes); 5072 5073 static void __md_stop(struct mddev *mddev) 5074 { 5075 mddev->ready = 0; 5076 mddev->pers->stop(mddev); 5077 if (mddev->pers->sync_request && mddev->to_remove == NULL) 5078 mddev->to_remove = &md_redundancy_group; 5079 module_put(mddev->pers->owner); 5080 mddev->pers = NULL; 5081 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5082 } 5083 5084 void md_stop(struct mddev *mddev) 5085 { 5086 /* stop the array and free an attached data structures. 5087 * This is called from dm-raid 5088 */ 5089 __md_stop(mddev); 5090 bitmap_destroy(mddev); 5091 if (mddev->bio_set) 5092 bioset_free(mddev->bio_set); 5093 } 5094 5095 EXPORT_SYMBOL_GPL(md_stop); 5096 5097 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) 5098 { 5099 int err = 0; 5100 int did_freeze = 0; 5101 5102 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { 5103 did_freeze = 1; 5104 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5105 md_wakeup_thread(mddev->thread); 5106 } 5107 if (mddev->sync_thread) { 5108 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5109 /* Thread might be blocked waiting for metadata update 5110 * which will now never happen */ 5111 wake_up_process(mddev->sync_thread->tsk); 5112 } 5113 mddev_unlock(mddev); 5114 wait_event(resync_wait, mddev->sync_thread == NULL); 5115 mddev_lock_nointr(mddev); 5116 5117 mutex_lock(&mddev->open_mutex); 5118 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || 5119 mddev->sync_thread || 5120 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { 5121 printk("md: %s still in use.\n",mdname(mddev)); 5122 if (did_freeze) { 5123 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5124 md_wakeup_thread(mddev->thread); 5125 } 5126 err = -EBUSY; 5127 goto out; 5128 } 5129 if (mddev->pers) { 5130 __md_stop_writes(mddev); 5131 5132 err = -ENXIO; 5133 if (mddev->ro==1) 5134 goto out; 5135 mddev->ro = 1; 5136 set_disk_ro(mddev->gendisk, 1); 5137 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5138 sysfs_notify_dirent_safe(mddev->sysfs_state); 5139 err = 0; 5140 } 5141 out: 5142 mutex_unlock(&mddev->open_mutex); 5143 return err; 5144 } 5145 5146 /* mode: 5147 * 0 - completely stop and dis-assemble array 5148 * 2 - stop but do not disassemble array 5149 */ 5150 static int do_md_stop(struct mddev *mddev, int mode, 5151 struct block_device *bdev) 5152 { 5153 struct gendisk *disk = mddev->gendisk; 5154 struct md_rdev *rdev; 5155 int did_freeze = 0; 5156 5157 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { 5158 did_freeze = 1; 5159 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5160 md_wakeup_thread(mddev->thread); 5161 } 5162 if (mddev->sync_thread) { 5163 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5164 /* Thread might be blocked waiting for metadata update 5165 * which will now never happen */ 5166 wake_up_process(mddev->sync_thread->tsk); 5167 } 5168 mddev_unlock(mddev); 5169 wait_event(resync_wait, mddev->sync_thread == NULL); 5170 mddev_lock_nointr(mddev); 5171 5172 mutex_lock(&mddev->open_mutex); 5173 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || 5174 mddev->sysfs_active || 5175 mddev->sync_thread || 5176 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { 5177 printk("md: %s still in use.\n",mdname(mddev)); 5178 mutex_unlock(&mddev->open_mutex); 5179 if (did_freeze) { 5180 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5181 md_wakeup_thread(mddev->thread); 5182 } 5183 return -EBUSY; 5184 } 5185 if (mddev->pers) { 5186 if (mddev->ro) 5187 set_disk_ro(disk, 0); 5188 5189 __md_stop_writes(mddev); 5190 __md_stop(mddev); 5191 mddev->queue->merge_bvec_fn = NULL; 5192 mddev->queue->backing_dev_info.congested_fn = NULL; 5193 5194 /* tell userspace to handle 'inactive' */ 5195 sysfs_notify_dirent_safe(mddev->sysfs_state); 5196 5197 rdev_for_each(rdev, mddev) 5198 if (rdev->raid_disk >= 0) 5199 sysfs_unlink_rdev(mddev, rdev); 5200 5201 set_capacity(disk, 0); 5202 mutex_unlock(&mddev->open_mutex); 5203 mddev->changed = 1; 5204 revalidate_disk(disk); 5205 5206 if (mddev->ro) 5207 mddev->ro = 0; 5208 } else 5209 mutex_unlock(&mddev->open_mutex); 5210 /* 5211 * Free resources if final stop 5212 */ 5213 if (mode == 0) { 5214 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); 5215 5216 bitmap_destroy(mddev); 5217 if (mddev->bitmap_info.file) { 5218 fput(mddev->bitmap_info.file); 5219 mddev->bitmap_info.file = NULL; 5220 } 5221 mddev->bitmap_info.offset = 0; 5222 5223 export_array(mddev); 5224 5225 md_clean(mddev); 5226 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 5227 if (mddev->hold_active == UNTIL_STOP) 5228 mddev->hold_active = 0; 5229 } 5230 blk_integrity_unregister(disk); 5231 md_new_event(mddev); 5232 sysfs_notify_dirent_safe(mddev->sysfs_state); 5233 return 0; 5234 } 5235 5236 #ifndef MODULE 5237 static void autorun_array(struct mddev *mddev) 5238 { 5239 struct md_rdev *rdev; 5240 int err; 5241 5242 if (list_empty(&mddev->disks)) 5243 return; 5244 5245 printk(KERN_INFO "md: running: "); 5246 5247 rdev_for_each(rdev, mddev) { 5248 char b[BDEVNAME_SIZE]; 5249 printk("<%s>", bdevname(rdev->bdev,b)); 5250 } 5251 printk("\n"); 5252 5253 err = do_md_run(mddev); 5254 if (err) { 5255 printk(KERN_WARNING "md: do_md_run() returned %d\n", err); 5256 do_md_stop(mddev, 0, NULL); 5257 } 5258 } 5259 5260 /* 5261 * lets try to run arrays based on all disks that have arrived 5262 * until now. (those are in pending_raid_disks) 5263 * 5264 * the method: pick the first pending disk, collect all disks with 5265 * the same UUID, remove all from the pending list and put them into 5266 * the 'same_array' list. Then order this list based on superblock 5267 * update time (freshest comes first), kick out 'old' disks and 5268 * compare superblocks. If everything's fine then run it. 5269 * 5270 * If "unit" is allocated, then bump its reference count 5271 */ 5272 static void autorun_devices(int part) 5273 { 5274 struct md_rdev *rdev0, *rdev, *tmp; 5275 struct mddev *mddev; 5276 char b[BDEVNAME_SIZE]; 5277 5278 printk(KERN_INFO "md: autorun ...\n"); 5279 while (!list_empty(&pending_raid_disks)) { 5280 int unit; 5281 dev_t dev; 5282 LIST_HEAD(candidates); 5283 rdev0 = list_entry(pending_raid_disks.next, 5284 struct md_rdev, same_set); 5285 5286 printk(KERN_INFO "md: considering %s ...\n", 5287 bdevname(rdev0->bdev,b)); 5288 INIT_LIST_HEAD(&candidates); 5289 rdev_for_each_list(rdev, tmp, &pending_raid_disks) 5290 if (super_90_load(rdev, rdev0, 0) >= 0) { 5291 printk(KERN_INFO "md: adding %s ...\n", 5292 bdevname(rdev->bdev,b)); 5293 list_move(&rdev->same_set, &candidates); 5294 } 5295 /* 5296 * now we have a set of devices, with all of them having 5297 * mostly sane superblocks. It's time to allocate the 5298 * mddev. 5299 */ 5300 if (part) { 5301 dev = MKDEV(mdp_major, 5302 rdev0->preferred_minor << MdpMinorShift); 5303 unit = MINOR(dev) >> MdpMinorShift; 5304 } else { 5305 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 5306 unit = MINOR(dev); 5307 } 5308 if (rdev0->preferred_minor != unit) { 5309 printk(KERN_INFO "md: unit number in %s is bad: %d\n", 5310 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 5311 break; 5312 } 5313 5314 md_probe(dev, NULL, NULL); 5315 mddev = mddev_find(dev); 5316 if (!mddev || !mddev->gendisk) { 5317 if (mddev) 5318 mddev_put(mddev); 5319 printk(KERN_ERR 5320 "md: cannot allocate memory for md drive.\n"); 5321 break; 5322 } 5323 if (mddev_lock(mddev)) 5324 printk(KERN_WARNING "md: %s locked, cannot run\n", 5325 mdname(mddev)); 5326 else if (mddev->raid_disks || mddev->major_version 5327 || !list_empty(&mddev->disks)) { 5328 printk(KERN_WARNING 5329 "md: %s already running, cannot run %s\n", 5330 mdname(mddev), bdevname(rdev0->bdev,b)); 5331 mddev_unlock(mddev); 5332 } else { 5333 printk(KERN_INFO "md: created %s\n", mdname(mddev)); 5334 mddev->persistent = 1; 5335 rdev_for_each_list(rdev, tmp, &candidates) { 5336 list_del_init(&rdev->same_set); 5337 if (bind_rdev_to_array(rdev, mddev)) 5338 export_rdev(rdev); 5339 } 5340 autorun_array(mddev); 5341 mddev_unlock(mddev); 5342 } 5343 /* on success, candidates will be empty, on error 5344 * it won't... 5345 */ 5346 rdev_for_each_list(rdev, tmp, &candidates) { 5347 list_del_init(&rdev->same_set); 5348 export_rdev(rdev); 5349 } 5350 mddev_put(mddev); 5351 } 5352 printk(KERN_INFO "md: ... autorun DONE.\n"); 5353 } 5354 #endif /* !MODULE */ 5355 5356 static int get_version(void __user *arg) 5357 { 5358 mdu_version_t ver; 5359 5360 ver.major = MD_MAJOR_VERSION; 5361 ver.minor = MD_MINOR_VERSION; 5362 ver.patchlevel = MD_PATCHLEVEL_VERSION; 5363 5364 if (copy_to_user(arg, &ver, sizeof(ver))) 5365 return -EFAULT; 5366 5367 return 0; 5368 } 5369 5370 static int get_array_info(struct mddev *mddev, void __user *arg) 5371 { 5372 mdu_array_info_t info; 5373 int nr,working,insync,failed,spare; 5374 struct md_rdev *rdev; 5375 5376 nr = working = insync = failed = spare = 0; 5377 rcu_read_lock(); 5378 rdev_for_each_rcu(rdev, mddev) { 5379 nr++; 5380 if (test_bit(Faulty, &rdev->flags)) 5381 failed++; 5382 else { 5383 working++; 5384 if (test_bit(In_sync, &rdev->flags)) 5385 insync++; 5386 else 5387 spare++; 5388 } 5389 } 5390 rcu_read_unlock(); 5391 5392 info.major_version = mddev->major_version; 5393 info.minor_version = mddev->minor_version; 5394 info.patch_version = MD_PATCHLEVEL_VERSION; 5395 info.ctime = mddev->ctime; 5396 info.level = mddev->level; 5397 info.size = mddev->dev_sectors / 2; 5398 if (info.size != mddev->dev_sectors / 2) /* overflow */ 5399 info.size = -1; 5400 info.nr_disks = nr; 5401 info.raid_disks = mddev->raid_disks; 5402 info.md_minor = mddev->md_minor; 5403 info.not_persistent= !mddev->persistent; 5404 5405 info.utime = mddev->utime; 5406 info.state = 0; 5407 if (mddev->in_sync) 5408 info.state = (1<<MD_SB_CLEAN); 5409 if (mddev->bitmap && mddev->bitmap_info.offset) 5410 info.state |= (1<<MD_SB_BITMAP_PRESENT); 5411 info.active_disks = insync; 5412 info.working_disks = working; 5413 info.failed_disks = failed; 5414 info.spare_disks = spare; 5415 5416 info.layout = mddev->layout; 5417 info.chunk_size = mddev->chunk_sectors << 9; 5418 5419 if (copy_to_user(arg, &info, sizeof(info))) 5420 return -EFAULT; 5421 5422 return 0; 5423 } 5424 5425 static int get_bitmap_file(struct mddev *mddev, void __user * arg) 5426 { 5427 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 5428 char *ptr, *buf = NULL; 5429 int err = -ENOMEM; 5430 5431 file = kmalloc(sizeof(*file), GFP_NOIO); 5432 5433 if (!file) 5434 goto out; 5435 5436 /* bitmap disabled, zero the first byte and copy out */ 5437 if (!mddev->bitmap || !mddev->bitmap->storage.file) { 5438 file->pathname[0] = '\0'; 5439 goto copy_out; 5440 } 5441 5442 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); 5443 if (!buf) 5444 goto out; 5445 5446 ptr = d_path(&mddev->bitmap->storage.file->f_path, 5447 buf, sizeof(file->pathname)); 5448 if (IS_ERR(ptr)) 5449 goto out; 5450 5451 strcpy(file->pathname, ptr); 5452 5453 copy_out: 5454 err = 0; 5455 if (copy_to_user(arg, file, sizeof(*file))) 5456 err = -EFAULT; 5457 out: 5458 kfree(buf); 5459 kfree(file); 5460 return err; 5461 } 5462 5463 static int get_disk_info(struct mddev *mddev, void __user * arg) 5464 { 5465 mdu_disk_info_t info; 5466 struct md_rdev *rdev; 5467 5468 if (copy_from_user(&info, arg, sizeof(info))) 5469 return -EFAULT; 5470 5471 rcu_read_lock(); 5472 rdev = find_rdev_nr_rcu(mddev, info.number); 5473 if (rdev) { 5474 info.major = MAJOR(rdev->bdev->bd_dev); 5475 info.minor = MINOR(rdev->bdev->bd_dev); 5476 info.raid_disk = rdev->raid_disk; 5477 info.state = 0; 5478 if (test_bit(Faulty, &rdev->flags)) 5479 info.state |= (1<<MD_DISK_FAULTY); 5480 else if (test_bit(In_sync, &rdev->flags)) { 5481 info.state |= (1<<MD_DISK_ACTIVE); 5482 info.state |= (1<<MD_DISK_SYNC); 5483 } 5484 if (test_bit(WriteMostly, &rdev->flags)) 5485 info.state |= (1<<MD_DISK_WRITEMOSTLY); 5486 } else { 5487 info.major = info.minor = 0; 5488 info.raid_disk = -1; 5489 info.state = (1<<MD_DISK_REMOVED); 5490 } 5491 rcu_read_unlock(); 5492 5493 if (copy_to_user(arg, &info, sizeof(info))) 5494 return -EFAULT; 5495 5496 return 0; 5497 } 5498 5499 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) 5500 { 5501 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 5502 struct md_rdev *rdev; 5503 dev_t dev = MKDEV(info->major,info->minor); 5504 5505 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 5506 return -EOVERFLOW; 5507 5508 if (!mddev->raid_disks) { 5509 int err; 5510 /* expecting a device which has a superblock */ 5511 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 5512 if (IS_ERR(rdev)) { 5513 printk(KERN_WARNING 5514 "md: md_import_device returned %ld\n", 5515 PTR_ERR(rdev)); 5516 return PTR_ERR(rdev); 5517 } 5518 if (!list_empty(&mddev->disks)) { 5519 struct md_rdev *rdev0 5520 = list_entry(mddev->disks.next, 5521 struct md_rdev, same_set); 5522 err = super_types[mddev->major_version] 5523 .load_super(rdev, rdev0, mddev->minor_version); 5524 if (err < 0) { 5525 printk(KERN_WARNING 5526 "md: %s has different UUID to %s\n", 5527 bdevname(rdev->bdev,b), 5528 bdevname(rdev0->bdev,b2)); 5529 export_rdev(rdev); 5530 return -EINVAL; 5531 } 5532 } 5533 err = bind_rdev_to_array(rdev, mddev); 5534 if (err) 5535 export_rdev(rdev); 5536 return err; 5537 } 5538 5539 /* 5540 * add_new_disk can be used once the array is assembled 5541 * to add "hot spares". They must already have a superblock 5542 * written 5543 */ 5544 if (mddev->pers) { 5545 int err; 5546 if (!mddev->pers->hot_add_disk) { 5547 printk(KERN_WARNING 5548 "%s: personality does not support diskops!\n", 5549 mdname(mddev)); 5550 return -EINVAL; 5551 } 5552 if (mddev->persistent) 5553 rdev = md_import_device(dev, mddev->major_version, 5554 mddev->minor_version); 5555 else 5556 rdev = md_import_device(dev, -1, -1); 5557 if (IS_ERR(rdev)) { 5558 printk(KERN_WARNING 5559 "md: md_import_device returned %ld\n", 5560 PTR_ERR(rdev)); 5561 return PTR_ERR(rdev); 5562 } 5563 /* set saved_raid_disk if appropriate */ 5564 if (!mddev->persistent) { 5565 if (info->state & (1<<MD_DISK_SYNC) && 5566 info->raid_disk < mddev->raid_disks) { 5567 rdev->raid_disk = info->raid_disk; 5568 set_bit(In_sync, &rdev->flags); 5569 clear_bit(Bitmap_sync, &rdev->flags); 5570 } else 5571 rdev->raid_disk = -1; 5572 rdev->saved_raid_disk = rdev->raid_disk; 5573 } else 5574 super_types[mddev->major_version]. 5575 validate_super(mddev, rdev); 5576 if ((info->state & (1<<MD_DISK_SYNC)) && 5577 rdev->raid_disk != info->raid_disk) { 5578 /* This was a hot-add request, but events doesn't 5579 * match, so reject it. 5580 */ 5581 export_rdev(rdev); 5582 return -EINVAL; 5583 } 5584 5585 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 5586 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 5587 set_bit(WriteMostly, &rdev->flags); 5588 else 5589 clear_bit(WriteMostly, &rdev->flags); 5590 5591 rdev->raid_disk = -1; 5592 err = bind_rdev_to_array(rdev, mddev); 5593 if (!err && !mddev->pers->hot_remove_disk) { 5594 /* If there is hot_add_disk but no hot_remove_disk 5595 * then added disks for geometry changes, 5596 * and should be added immediately. 5597 */ 5598 super_types[mddev->major_version]. 5599 validate_super(mddev, rdev); 5600 err = mddev->pers->hot_add_disk(mddev, rdev); 5601 if (err) 5602 unbind_rdev_from_array(rdev); 5603 } 5604 if (err) 5605 export_rdev(rdev); 5606 else 5607 sysfs_notify_dirent_safe(rdev->sysfs_state); 5608 5609 set_bit(MD_CHANGE_DEVS, &mddev->flags); 5610 if (mddev->degraded) 5611 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 5612 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5613 if (!err) 5614 md_new_event(mddev); 5615 md_wakeup_thread(mddev->thread); 5616 return err; 5617 } 5618 5619 /* otherwise, add_new_disk is only allowed 5620 * for major_version==0 superblocks 5621 */ 5622 if (mddev->major_version != 0) { 5623 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", 5624 mdname(mddev)); 5625 return -EINVAL; 5626 } 5627 5628 if (!(info->state & (1<<MD_DISK_FAULTY))) { 5629 int err; 5630 rdev = md_import_device(dev, -1, 0); 5631 if (IS_ERR(rdev)) { 5632 printk(KERN_WARNING 5633 "md: error, md_import_device() returned %ld\n", 5634 PTR_ERR(rdev)); 5635 return PTR_ERR(rdev); 5636 } 5637 rdev->desc_nr = info->number; 5638 if (info->raid_disk < mddev->raid_disks) 5639 rdev->raid_disk = info->raid_disk; 5640 else 5641 rdev->raid_disk = -1; 5642 5643 if (rdev->raid_disk < mddev->raid_disks) 5644 if (info->state & (1<<MD_DISK_SYNC)) 5645 set_bit(In_sync, &rdev->flags); 5646 5647 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 5648 set_bit(WriteMostly, &rdev->flags); 5649 5650 if (!mddev->persistent) { 5651 printk(KERN_INFO "md: nonpersistent superblock ...\n"); 5652 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 5653 } else 5654 rdev->sb_start = calc_dev_sboffset(rdev); 5655 rdev->sectors = rdev->sb_start; 5656 5657 err = bind_rdev_to_array(rdev, mddev); 5658 if (err) { 5659 export_rdev(rdev); 5660 return err; 5661 } 5662 } 5663 5664 return 0; 5665 } 5666 5667 static int hot_remove_disk(struct mddev *mddev, dev_t dev) 5668 { 5669 char b[BDEVNAME_SIZE]; 5670 struct md_rdev *rdev; 5671 5672 rdev = find_rdev(mddev, dev); 5673 if (!rdev) 5674 return -ENXIO; 5675 5676 clear_bit(Blocked, &rdev->flags); 5677 remove_and_add_spares(mddev, rdev); 5678 5679 if (rdev->raid_disk >= 0) 5680 goto busy; 5681 5682 kick_rdev_from_array(rdev); 5683 md_update_sb(mddev, 1); 5684 md_new_event(mddev); 5685 5686 return 0; 5687 busy: 5688 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", 5689 bdevname(rdev->bdev,b), mdname(mddev)); 5690 return -EBUSY; 5691 } 5692 5693 static int hot_add_disk(struct mddev *mddev, dev_t dev) 5694 { 5695 char b[BDEVNAME_SIZE]; 5696 int err; 5697 struct md_rdev *rdev; 5698 5699 if (!mddev->pers) 5700 return -ENODEV; 5701 5702 if (mddev->major_version != 0) { 5703 printk(KERN_WARNING "%s: HOT_ADD may only be used with" 5704 " version-0 superblocks.\n", 5705 mdname(mddev)); 5706 return -EINVAL; 5707 } 5708 if (!mddev->pers->hot_add_disk) { 5709 printk(KERN_WARNING 5710 "%s: personality does not support diskops!\n", 5711 mdname(mddev)); 5712 return -EINVAL; 5713 } 5714 5715 rdev = md_import_device(dev, -1, 0); 5716 if (IS_ERR(rdev)) { 5717 printk(KERN_WARNING 5718 "md: error, md_import_device() returned %ld\n", 5719 PTR_ERR(rdev)); 5720 return -EINVAL; 5721 } 5722 5723 if (mddev->persistent) 5724 rdev->sb_start = calc_dev_sboffset(rdev); 5725 else 5726 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 5727 5728 rdev->sectors = rdev->sb_start; 5729 5730 if (test_bit(Faulty, &rdev->flags)) { 5731 printk(KERN_WARNING 5732 "md: can not hot-add faulty %s disk to %s!\n", 5733 bdevname(rdev->bdev,b), mdname(mddev)); 5734 err = -EINVAL; 5735 goto abort_export; 5736 } 5737 clear_bit(In_sync, &rdev->flags); 5738 rdev->desc_nr = -1; 5739 rdev->saved_raid_disk = -1; 5740 err = bind_rdev_to_array(rdev, mddev); 5741 if (err) 5742 goto abort_export; 5743 5744 /* 5745 * The rest should better be atomic, we can have disk failures 5746 * noticed in interrupt contexts ... 5747 */ 5748 5749 rdev->raid_disk = -1; 5750 5751 md_update_sb(mddev, 1); 5752 5753 /* 5754 * Kick recovery, maybe this spare has to be added to the 5755 * array immediately. 5756 */ 5757 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5758 md_wakeup_thread(mddev->thread); 5759 md_new_event(mddev); 5760 return 0; 5761 5762 abort_export: 5763 export_rdev(rdev); 5764 return err; 5765 } 5766 5767 static int set_bitmap_file(struct mddev *mddev, int fd) 5768 { 5769 int err = 0; 5770 5771 if (mddev->pers) { 5772 if (!mddev->pers->quiesce || !mddev->thread) 5773 return -EBUSY; 5774 if (mddev->recovery || mddev->sync_thread) 5775 return -EBUSY; 5776 /* we should be able to change the bitmap.. */ 5777 } 5778 5779 if (fd >= 0) { 5780 struct inode *inode; 5781 if (mddev->bitmap) 5782 return -EEXIST; /* cannot add when bitmap is present */ 5783 mddev->bitmap_info.file = fget(fd); 5784 5785 if (mddev->bitmap_info.file == NULL) { 5786 printk(KERN_ERR "%s: error: failed to get bitmap file\n", 5787 mdname(mddev)); 5788 return -EBADF; 5789 } 5790 5791 inode = mddev->bitmap_info.file->f_mapping->host; 5792 if (!S_ISREG(inode->i_mode)) { 5793 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", 5794 mdname(mddev)); 5795 err = -EBADF; 5796 } else if (!(mddev->bitmap_info.file->f_mode & FMODE_WRITE)) { 5797 printk(KERN_ERR "%s: error: bitmap file must open for write\n", 5798 mdname(mddev)); 5799 err = -EBADF; 5800 } else if (atomic_read(&inode->i_writecount) != 1) { 5801 printk(KERN_ERR "%s: error: bitmap file is already in use\n", 5802 mdname(mddev)); 5803 err = -EBUSY; 5804 } 5805 if (err) { 5806 fput(mddev->bitmap_info.file); 5807 mddev->bitmap_info.file = NULL; 5808 return err; 5809 } 5810 mddev->bitmap_info.offset = 0; /* file overrides offset */ 5811 } else if (mddev->bitmap == NULL) 5812 return -ENOENT; /* cannot remove what isn't there */ 5813 err = 0; 5814 if (mddev->pers) { 5815 mddev->pers->quiesce(mddev, 1); 5816 if (fd >= 0) { 5817 err = bitmap_create(mddev); 5818 if (!err) 5819 err = bitmap_load(mddev); 5820 } 5821 if (fd < 0 || err) { 5822 bitmap_destroy(mddev); 5823 fd = -1; /* make sure to put the file */ 5824 } 5825 mddev->pers->quiesce(mddev, 0); 5826 } 5827 if (fd < 0) { 5828 if (mddev->bitmap_info.file) 5829 fput(mddev->bitmap_info.file); 5830 mddev->bitmap_info.file = NULL; 5831 } 5832 5833 return err; 5834 } 5835 5836 /* 5837 * set_array_info is used two different ways 5838 * The original usage is when creating a new array. 5839 * In this usage, raid_disks is > 0 and it together with 5840 * level, size, not_persistent,layout,chunksize determine the 5841 * shape of the array. 5842 * This will always create an array with a type-0.90.0 superblock. 5843 * The newer usage is when assembling an array. 5844 * In this case raid_disks will be 0, and the major_version field is 5845 * use to determine which style super-blocks are to be found on the devices. 5846 * The minor and patch _version numbers are also kept incase the 5847 * super_block handler wishes to interpret them. 5848 */ 5849 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) 5850 { 5851 5852 if (info->raid_disks == 0) { 5853 /* just setting version number for superblock loading */ 5854 if (info->major_version < 0 || 5855 info->major_version >= ARRAY_SIZE(super_types) || 5856 super_types[info->major_version].name == NULL) { 5857 /* maybe try to auto-load a module? */ 5858 printk(KERN_INFO 5859 "md: superblock version %d not known\n", 5860 info->major_version); 5861 return -EINVAL; 5862 } 5863 mddev->major_version = info->major_version; 5864 mddev->minor_version = info->minor_version; 5865 mddev->patch_version = info->patch_version; 5866 mddev->persistent = !info->not_persistent; 5867 /* ensure mddev_put doesn't delete this now that there 5868 * is some minimal configuration. 5869 */ 5870 mddev->ctime = get_seconds(); 5871 return 0; 5872 } 5873 mddev->major_version = MD_MAJOR_VERSION; 5874 mddev->minor_version = MD_MINOR_VERSION; 5875 mddev->patch_version = MD_PATCHLEVEL_VERSION; 5876 mddev->ctime = get_seconds(); 5877 5878 mddev->level = info->level; 5879 mddev->clevel[0] = 0; 5880 mddev->dev_sectors = 2 * (sector_t)info->size; 5881 mddev->raid_disks = info->raid_disks; 5882 /* don't set md_minor, it is determined by which /dev/md* was 5883 * openned 5884 */ 5885 if (info->state & (1<<MD_SB_CLEAN)) 5886 mddev->recovery_cp = MaxSector; 5887 else 5888 mddev->recovery_cp = 0; 5889 mddev->persistent = ! info->not_persistent; 5890 mddev->external = 0; 5891 5892 mddev->layout = info->layout; 5893 mddev->chunk_sectors = info->chunk_size >> 9; 5894 5895 mddev->max_disks = MD_SB_DISKS; 5896 5897 if (mddev->persistent) 5898 mddev->flags = 0; 5899 set_bit(MD_CHANGE_DEVS, &mddev->flags); 5900 5901 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 5902 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); 5903 mddev->bitmap_info.offset = 0; 5904 5905 mddev->reshape_position = MaxSector; 5906 5907 /* 5908 * Generate a 128 bit UUID 5909 */ 5910 get_random_bytes(mddev->uuid, 16); 5911 5912 mddev->new_level = mddev->level; 5913 mddev->new_chunk_sectors = mddev->chunk_sectors; 5914 mddev->new_layout = mddev->layout; 5915 mddev->delta_disks = 0; 5916 mddev->reshape_backwards = 0; 5917 5918 return 0; 5919 } 5920 5921 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) 5922 { 5923 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); 5924 5925 if (mddev->external_size) 5926 return; 5927 5928 mddev->array_sectors = array_sectors; 5929 } 5930 EXPORT_SYMBOL(md_set_array_sectors); 5931 5932 static int update_size(struct mddev *mddev, sector_t num_sectors) 5933 { 5934 struct md_rdev *rdev; 5935 int rv; 5936 int fit = (num_sectors == 0); 5937 5938 if (mddev->pers->resize == NULL) 5939 return -EINVAL; 5940 /* The "num_sectors" is the number of sectors of each device that 5941 * is used. This can only make sense for arrays with redundancy. 5942 * linear and raid0 always use whatever space is available. We can only 5943 * consider changing this number if no resync or reconstruction is 5944 * happening, and if the new size is acceptable. It must fit before the 5945 * sb_start or, if that is <data_offset, it must fit before the size 5946 * of each device. If num_sectors is zero, we find the largest size 5947 * that fits. 5948 */ 5949 if (mddev->sync_thread) 5950 return -EBUSY; 5951 if (mddev->ro) 5952 return -EROFS; 5953 5954 rdev_for_each(rdev, mddev) { 5955 sector_t avail = rdev->sectors; 5956 5957 if (fit && (num_sectors == 0 || num_sectors > avail)) 5958 num_sectors = avail; 5959 if (avail < num_sectors) 5960 return -ENOSPC; 5961 } 5962 rv = mddev->pers->resize(mddev, num_sectors); 5963 if (!rv) 5964 revalidate_disk(mddev->gendisk); 5965 return rv; 5966 } 5967 5968 static int update_raid_disks(struct mddev *mddev, int raid_disks) 5969 { 5970 int rv; 5971 struct md_rdev *rdev; 5972 /* change the number of raid disks */ 5973 if (mddev->pers->check_reshape == NULL) 5974 return -EINVAL; 5975 if (mddev->ro) 5976 return -EROFS; 5977 if (raid_disks <= 0 || 5978 (mddev->max_disks && raid_disks >= mddev->max_disks)) 5979 return -EINVAL; 5980 if (mddev->sync_thread || mddev->reshape_position != MaxSector) 5981 return -EBUSY; 5982 5983 rdev_for_each(rdev, mddev) { 5984 if (mddev->raid_disks < raid_disks && 5985 rdev->data_offset < rdev->new_data_offset) 5986 return -EINVAL; 5987 if (mddev->raid_disks > raid_disks && 5988 rdev->data_offset > rdev->new_data_offset) 5989 return -EINVAL; 5990 } 5991 5992 mddev->delta_disks = raid_disks - mddev->raid_disks; 5993 if (mddev->delta_disks < 0) 5994 mddev->reshape_backwards = 1; 5995 else if (mddev->delta_disks > 0) 5996 mddev->reshape_backwards = 0; 5997 5998 rv = mddev->pers->check_reshape(mddev); 5999 if (rv < 0) { 6000 mddev->delta_disks = 0; 6001 mddev->reshape_backwards = 0; 6002 } 6003 return rv; 6004 } 6005 6006 /* 6007 * update_array_info is used to change the configuration of an 6008 * on-line array. 6009 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 6010 * fields in the info are checked against the array. 6011 * Any differences that cannot be handled will cause an error. 6012 * Normally, only one change can be managed at a time. 6013 */ 6014 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) 6015 { 6016 int rv = 0; 6017 int cnt = 0; 6018 int state = 0; 6019 6020 /* calculate expected state,ignoring low bits */ 6021 if (mddev->bitmap && mddev->bitmap_info.offset) 6022 state |= (1 << MD_SB_BITMAP_PRESENT); 6023 6024 if (mddev->major_version != info->major_version || 6025 mddev->minor_version != info->minor_version || 6026 /* mddev->patch_version != info->patch_version || */ 6027 mddev->ctime != info->ctime || 6028 mddev->level != info->level || 6029 /* mddev->layout != info->layout || */ 6030 !mddev->persistent != info->not_persistent|| 6031 mddev->chunk_sectors != info->chunk_size >> 9 || 6032 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 6033 ((state^info->state) & 0xfffffe00) 6034 ) 6035 return -EINVAL; 6036 /* Check there is only one change */ 6037 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 6038 cnt++; 6039 if (mddev->raid_disks != info->raid_disks) 6040 cnt++; 6041 if (mddev->layout != info->layout) 6042 cnt++; 6043 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) 6044 cnt++; 6045 if (cnt == 0) 6046 return 0; 6047 if (cnt > 1) 6048 return -EINVAL; 6049 6050 if (mddev->layout != info->layout) { 6051 /* Change layout 6052 * we don't need to do anything at the md level, the 6053 * personality will take care of it all. 6054 */ 6055 if (mddev->pers->check_reshape == NULL) 6056 return -EINVAL; 6057 else { 6058 mddev->new_layout = info->layout; 6059 rv = mddev->pers->check_reshape(mddev); 6060 if (rv) 6061 mddev->new_layout = mddev->layout; 6062 return rv; 6063 } 6064 } 6065 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 6066 rv = update_size(mddev, (sector_t)info->size * 2); 6067 6068 if (mddev->raid_disks != info->raid_disks) 6069 rv = update_raid_disks(mddev, info->raid_disks); 6070 6071 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 6072 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) 6073 return -EINVAL; 6074 if (mddev->recovery || mddev->sync_thread) 6075 return -EBUSY; 6076 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 6077 /* add the bitmap */ 6078 if (mddev->bitmap) 6079 return -EEXIST; 6080 if (mddev->bitmap_info.default_offset == 0) 6081 return -EINVAL; 6082 mddev->bitmap_info.offset = 6083 mddev->bitmap_info.default_offset; 6084 mddev->bitmap_info.space = 6085 mddev->bitmap_info.default_space; 6086 mddev->pers->quiesce(mddev, 1); 6087 rv = bitmap_create(mddev); 6088 if (!rv) 6089 rv = bitmap_load(mddev); 6090 if (rv) 6091 bitmap_destroy(mddev); 6092 mddev->pers->quiesce(mddev, 0); 6093 } else { 6094 /* remove the bitmap */ 6095 if (!mddev->bitmap) 6096 return -ENOENT; 6097 if (mddev->bitmap->storage.file) 6098 return -EINVAL; 6099 mddev->pers->quiesce(mddev, 1); 6100 bitmap_destroy(mddev); 6101 mddev->pers->quiesce(mddev, 0); 6102 mddev->bitmap_info.offset = 0; 6103 } 6104 } 6105 md_update_sb(mddev, 1); 6106 return rv; 6107 } 6108 6109 static int set_disk_faulty(struct mddev *mddev, dev_t dev) 6110 { 6111 struct md_rdev *rdev; 6112 int err = 0; 6113 6114 if (mddev->pers == NULL) 6115 return -ENODEV; 6116 6117 rcu_read_lock(); 6118 rdev = find_rdev_rcu(mddev, dev); 6119 if (!rdev) 6120 err = -ENODEV; 6121 else { 6122 md_error(mddev, rdev); 6123 if (!test_bit(Faulty, &rdev->flags)) 6124 err = -EBUSY; 6125 } 6126 rcu_read_unlock(); 6127 return err; 6128 } 6129 6130 /* 6131 * We have a problem here : there is no easy way to give a CHS 6132 * virtual geometry. We currently pretend that we have a 2 heads 6133 * 4 sectors (with a BIG number of cylinders...). This drives 6134 * dosfs just mad... ;-) 6135 */ 6136 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) 6137 { 6138 struct mddev *mddev = bdev->bd_disk->private_data; 6139 6140 geo->heads = 2; 6141 geo->sectors = 4; 6142 geo->cylinders = mddev->array_sectors / 8; 6143 return 0; 6144 } 6145 6146 static inline bool md_ioctl_valid(unsigned int cmd) 6147 { 6148 switch (cmd) { 6149 case ADD_NEW_DISK: 6150 case BLKROSET: 6151 case GET_ARRAY_INFO: 6152 case GET_BITMAP_FILE: 6153 case GET_DISK_INFO: 6154 case HOT_ADD_DISK: 6155 case HOT_REMOVE_DISK: 6156 case RAID_AUTORUN: 6157 case RAID_VERSION: 6158 case RESTART_ARRAY_RW: 6159 case RUN_ARRAY: 6160 case SET_ARRAY_INFO: 6161 case SET_BITMAP_FILE: 6162 case SET_DISK_FAULTY: 6163 case STOP_ARRAY: 6164 case STOP_ARRAY_RO: 6165 return true; 6166 default: 6167 return false; 6168 } 6169 } 6170 6171 static int md_ioctl(struct block_device *bdev, fmode_t mode, 6172 unsigned int cmd, unsigned long arg) 6173 { 6174 int err = 0; 6175 void __user *argp = (void __user *)arg; 6176 struct mddev *mddev = NULL; 6177 int ro; 6178 6179 if (!md_ioctl_valid(cmd)) 6180 return -ENOTTY; 6181 6182 switch (cmd) { 6183 case RAID_VERSION: 6184 case GET_ARRAY_INFO: 6185 case GET_DISK_INFO: 6186 break; 6187 default: 6188 if (!capable(CAP_SYS_ADMIN)) 6189 return -EACCES; 6190 } 6191 6192 /* 6193 * Commands dealing with the RAID driver but not any 6194 * particular array: 6195 */ 6196 switch (cmd) { 6197 case RAID_VERSION: 6198 err = get_version(argp); 6199 goto out; 6200 6201 #ifndef MODULE 6202 case RAID_AUTORUN: 6203 err = 0; 6204 autostart_arrays(arg); 6205 goto out; 6206 #endif 6207 default:; 6208 } 6209 6210 /* 6211 * Commands creating/starting a new array: 6212 */ 6213 6214 mddev = bdev->bd_disk->private_data; 6215 6216 if (!mddev) { 6217 BUG(); 6218 goto out; 6219 } 6220 6221 /* Some actions do not requires the mutex */ 6222 switch (cmd) { 6223 case GET_ARRAY_INFO: 6224 if (!mddev->raid_disks && !mddev->external) 6225 err = -ENODEV; 6226 else 6227 err = get_array_info(mddev, argp); 6228 goto out; 6229 6230 case GET_DISK_INFO: 6231 if (!mddev->raid_disks && !mddev->external) 6232 err = -ENODEV; 6233 else 6234 err = get_disk_info(mddev, argp); 6235 goto out; 6236 6237 case SET_DISK_FAULTY: 6238 err = set_disk_faulty(mddev, new_decode_dev(arg)); 6239 goto out; 6240 } 6241 6242 if (cmd == ADD_NEW_DISK) 6243 /* need to ensure md_delayed_delete() has completed */ 6244 flush_workqueue(md_misc_wq); 6245 6246 if (cmd == HOT_REMOVE_DISK) 6247 /* need to ensure recovery thread has run */ 6248 wait_event_interruptible_timeout(mddev->sb_wait, 6249 !test_bit(MD_RECOVERY_NEEDED, 6250 &mddev->flags), 6251 msecs_to_jiffies(5000)); 6252 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { 6253 /* Need to flush page cache, and ensure no-one else opens 6254 * and writes 6255 */ 6256 mutex_lock(&mddev->open_mutex); 6257 if (mddev->pers && atomic_read(&mddev->openers) > 1) { 6258 mutex_unlock(&mddev->open_mutex); 6259 err = -EBUSY; 6260 goto out; 6261 } 6262 set_bit(MD_STILL_CLOSED, &mddev->flags); 6263 mutex_unlock(&mddev->open_mutex); 6264 sync_blockdev(bdev); 6265 } 6266 err = mddev_lock(mddev); 6267 if (err) { 6268 printk(KERN_INFO 6269 "md: ioctl lock interrupted, reason %d, cmd %d\n", 6270 err, cmd); 6271 goto out; 6272 } 6273 6274 if (cmd == SET_ARRAY_INFO) { 6275 mdu_array_info_t info; 6276 if (!arg) 6277 memset(&info, 0, sizeof(info)); 6278 else if (copy_from_user(&info, argp, sizeof(info))) { 6279 err = -EFAULT; 6280 goto unlock; 6281 } 6282 if (mddev->pers) { 6283 err = update_array_info(mddev, &info); 6284 if (err) { 6285 printk(KERN_WARNING "md: couldn't update" 6286 " array info. %d\n", err); 6287 goto unlock; 6288 } 6289 goto unlock; 6290 } 6291 if (!list_empty(&mddev->disks)) { 6292 printk(KERN_WARNING 6293 "md: array %s already has disks!\n", 6294 mdname(mddev)); 6295 err = -EBUSY; 6296 goto unlock; 6297 } 6298 if (mddev->raid_disks) { 6299 printk(KERN_WARNING 6300 "md: array %s already initialised!\n", 6301 mdname(mddev)); 6302 err = -EBUSY; 6303 goto unlock; 6304 } 6305 err = set_array_info(mddev, &info); 6306 if (err) { 6307 printk(KERN_WARNING "md: couldn't set" 6308 " array info. %d\n", err); 6309 goto unlock; 6310 } 6311 goto unlock; 6312 } 6313 6314 /* 6315 * Commands querying/configuring an existing array: 6316 */ 6317 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 6318 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ 6319 if ((!mddev->raid_disks && !mddev->external) 6320 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 6321 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE 6322 && cmd != GET_BITMAP_FILE) { 6323 err = -ENODEV; 6324 goto unlock; 6325 } 6326 6327 /* 6328 * Commands even a read-only array can execute: 6329 */ 6330 switch (cmd) { 6331 case GET_BITMAP_FILE: 6332 err = get_bitmap_file(mddev, argp); 6333 goto unlock; 6334 6335 case RESTART_ARRAY_RW: 6336 err = restart_array(mddev); 6337 goto unlock; 6338 6339 case STOP_ARRAY: 6340 err = do_md_stop(mddev, 0, bdev); 6341 goto unlock; 6342 6343 case STOP_ARRAY_RO: 6344 err = md_set_readonly(mddev, bdev); 6345 goto unlock; 6346 6347 case HOT_REMOVE_DISK: 6348 err = hot_remove_disk(mddev, new_decode_dev(arg)); 6349 goto unlock; 6350 6351 case ADD_NEW_DISK: 6352 /* We can support ADD_NEW_DISK on read-only arrays 6353 * on if we are re-adding a preexisting device. 6354 * So require mddev->pers and MD_DISK_SYNC. 6355 */ 6356 if (mddev->pers) { 6357 mdu_disk_info_t info; 6358 if (copy_from_user(&info, argp, sizeof(info))) 6359 err = -EFAULT; 6360 else if (!(info.state & (1<<MD_DISK_SYNC))) 6361 /* Need to clear read-only for this */ 6362 break; 6363 else 6364 err = add_new_disk(mddev, &info); 6365 goto unlock; 6366 } 6367 break; 6368 6369 case BLKROSET: 6370 if (get_user(ro, (int __user *)(arg))) { 6371 err = -EFAULT; 6372 goto unlock; 6373 } 6374 err = -EINVAL; 6375 6376 /* if the bdev is going readonly the value of mddev->ro 6377 * does not matter, no writes are coming 6378 */ 6379 if (ro) 6380 goto unlock; 6381 6382 /* are we are already prepared for writes? */ 6383 if (mddev->ro != 1) 6384 goto unlock; 6385 6386 /* transitioning to readauto need only happen for 6387 * arrays that call md_write_start 6388 */ 6389 if (mddev->pers) { 6390 err = restart_array(mddev); 6391 if (err == 0) { 6392 mddev->ro = 2; 6393 set_disk_ro(mddev->gendisk, 0); 6394 } 6395 } 6396 goto unlock; 6397 } 6398 6399 /* 6400 * The remaining ioctls are changing the state of the 6401 * superblock, so we do not allow them on read-only arrays. 6402 */ 6403 if (mddev->ro && mddev->pers) { 6404 if (mddev->ro == 2) { 6405 mddev->ro = 0; 6406 sysfs_notify_dirent_safe(mddev->sysfs_state); 6407 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6408 /* mddev_unlock will wake thread */ 6409 /* If a device failed while we were read-only, we 6410 * need to make sure the metadata is updated now. 6411 */ 6412 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { 6413 mddev_unlock(mddev); 6414 wait_event(mddev->sb_wait, 6415 !test_bit(MD_CHANGE_DEVS, &mddev->flags) && 6416 !test_bit(MD_CHANGE_PENDING, &mddev->flags)); 6417 mddev_lock_nointr(mddev); 6418 } 6419 } else { 6420 err = -EROFS; 6421 goto unlock; 6422 } 6423 } 6424 6425 switch (cmd) { 6426 case ADD_NEW_DISK: 6427 { 6428 mdu_disk_info_t info; 6429 if (copy_from_user(&info, argp, sizeof(info))) 6430 err = -EFAULT; 6431 else 6432 err = add_new_disk(mddev, &info); 6433 goto unlock; 6434 } 6435 6436 case HOT_ADD_DISK: 6437 err = hot_add_disk(mddev, new_decode_dev(arg)); 6438 goto unlock; 6439 6440 case RUN_ARRAY: 6441 err = do_md_run(mddev); 6442 goto unlock; 6443 6444 case SET_BITMAP_FILE: 6445 err = set_bitmap_file(mddev, (int)arg); 6446 goto unlock; 6447 6448 default: 6449 err = -EINVAL; 6450 goto unlock; 6451 } 6452 6453 unlock: 6454 if (mddev->hold_active == UNTIL_IOCTL && 6455 err != -EINVAL) 6456 mddev->hold_active = 0; 6457 mddev_unlock(mddev); 6458 out: 6459 return err; 6460 } 6461 #ifdef CONFIG_COMPAT 6462 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, 6463 unsigned int cmd, unsigned long arg) 6464 { 6465 switch (cmd) { 6466 case HOT_REMOVE_DISK: 6467 case HOT_ADD_DISK: 6468 case SET_DISK_FAULTY: 6469 case SET_BITMAP_FILE: 6470 /* These take in integer arg, do not convert */ 6471 break; 6472 default: 6473 arg = (unsigned long)compat_ptr(arg); 6474 break; 6475 } 6476 6477 return md_ioctl(bdev, mode, cmd, arg); 6478 } 6479 #endif /* CONFIG_COMPAT */ 6480 6481 static int md_open(struct block_device *bdev, fmode_t mode) 6482 { 6483 /* 6484 * Succeed if we can lock the mddev, which confirms that 6485 * it isn't being stopped right now. 6486 */ 6487 struct mddev *mddev = mddev_find(bdev->bd_dev); 6488 int err; 6489 6490 if (!mddev) 6491 return -ENODEV; 6492 6493 if (mddev->gendisk != bdev->bd_disk) { 6494 /* we are racing with mddev_put which is discarding this 6495 * bd_disk. 6496 */ 6497 mddev_put(mddev); 6498 /* Wait until bdev->bd_disk is definitely gone */ 6499 flush_workqueue(md_misc_wq); 6500 /* Then retry the open from the top */ 6501 return -ERESTARTSYS; 6502 } 6503 BUG_ON(mddev != bdev->bd_disk->private_data); 6504 6505 if ((err = mutex_lock_interruptible(&mddev->open_mutex))) 6506 goto out; 6507 6508 err = 0; 6509 atomic_inc(&mddev->openers); 6510 clear_bit(MD_STILL_CLOSED, &mddev->flags); 6511 mutex_unlock(&mddev->open_mutex); 6512 6513 check_disk_change(bdev); 6514 out: 6515 return err; 6516 } 6517 6518 static void md_release(struct gendisk *disk, fmode_t mode) 6519 { 6520 struct mddev *mddev = disk->private_data; 6521 6522 BUG_ON(!mddev); 6523 atomic_dec(&mddev->openers); 6524 mddev_put(mddev); 6525 } 6526 6527 static int md_media_changed(struct gendisk *disk) 6528 { 6529 struct mddev *mddev = disk->private_data; 6530 6531 return mddev->changed; 6532 } 6533 6534 static int md_revalidate(struct gendisk *disk) 6535 { 6536 struct mddev *mddev = disk->private_data; 6537 6538 mddev->changed = 0; 6539 return 0; 6540 } 6541 static const struct block_device_operations md_fops = 6542 { 6543 .owner = THIS_MODULE, 6544 .open = md_open, 6545 .release = md_release, 6546 .ioctl = md_ioctl, 6547 #ifdef CONFIG_COMPAT 6548 .compat_ioctl = md_compat_ioctl, 6549 #endif 6550 .getgeo = md_getgeo, 6551 .media_changed = md_media_changed, 6552 .revalidate_disk= md_revalidate, 6553 }; 6554 6555 static int md_thread(void *arg) 6556 { 6557 struct md_thread *thread = arg; 6558 6559 /* 6560 * md_thread is a 'system-thread', it's priority should be very 6561 * high. We avoid resource deadlocks individually in each 6562 * raid personality. (RAID5 does preallocation) We also use RR and 6563 * the very same RT priority as kswapd, thus we will never get 6564 * into a priority inversion deadlock. 6565 * 6566 * we definitely have to have equal or higher priority than 6567 * bdflush, otherwise bdflush will deadlock if there are too 6568 * many dirty RAID5 blocks. 6569 */ 6570 6571 allow_signal(SIGKILL); 6572 while (!kthread_should_stop()) { 6573 6574 /* We need to wait INTERRUPTIBLE so that 6575 * we don't add to the load-average. 6576 * That means we need to be sure no signals are 6577 * pending 6578 */ 6579 if (signal_pending(current)) 6580 flush_signals(current); 6581 6582 wait_event_interruptible_timeout 6583 (thread->wqueue, 6584 test_bit(THREAD_WAKEUP, &thread->flags) 6585 || kthread_should_stop(), 6586 thread->timeout); 6587 6588 clear_bit(THREAD_WAKEUP, &thread->flags); 6589 if (!kthread_should_stop()) 6590 thread->run(thread); 6591 } 6592 6593 return 0; 6594 } 6595 6596 void md_wakeup_thread(struct md_thread *thread) 6597 { 6598 if (thread) { 6599 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); 6600 set_bit(THREAD_WAKEUP, &thread->flags); 6601 wake_up(&thread->wqueue); 6602 } 6603 } 6604 EXPORT_SYMBOL(md_wakeup_thread); 6605 6606 struct md_thread *md_register_thread(void (*run) (struct md_thread *), 6607 struct mddev *mddev, const char *name) 6608 { 6609 struct md_thread *thread; 6610 6611 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); 6612 if (!thread) 6613 return NULL; 6614 6615 init_waitqueue_head(&thread->wqueue); 6616 6617 thread->run = run; 6618 thread->mddev = mddev; 6619 thread->timeout = MAX_SCHEDULE_TIMEOUT; 6620 thread->tsk = kthread_run(md_thread, thread, 6621 "%s_%s", 6622 mdname(thread->mddev), 6623 name); 6624 if (IS_ERR(thread->tsk)) { 6625 kfree(thread); 6626 return NULL; 6627 } 6628 return thread; 6629 } 6630 EXPORT_SYMBOL(md_register_thread); 6631 6632 void md_unregister_thread(struct md_thread **threadp) 6633 { 6634 struct md_thread *thread = *threadp; 6635 if (!thread) 6636 return; 6637 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); 6638 /* Locking ensures that mddev_unlock does not wake_up a 6639 * non-existent thread 6640 */ 6641 spin_lock(&pers_lock); 6642 *threadp = NULL; 6643 spin_unlock(&pers_lock); 6644 6645 kthread_stop(thread->tsk); 6646 kfree(thread); 6647 } 6648 EXPORT_SYMBOL(md_unregister_thread); 6649 6650 void md_error(struct mddev *mddev, struct md_rdev *rdev) 6651 { 6652 if (!rdev || test_bit(Faulty, &rdev->flags)) 6653 return; 6654 6655 if (!mddev->pers || !mddev->pers->error_handler) 6656 return; 6657 mddev->pers->error_handler(mddev,rdev); 6658 if (mddev->degraded) 6659 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 6660 sysfs_notify_dirent_safe(rdev->sysfs_state); 6661 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6662 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6663 md_wakeup_thread(mddev->thread); 6664 if (mddev->event_work.func) 6665 queue_work(md_misc_wq, &mddev->event_work); 6666 md_new_event_inintr(mddev); 6667 } 6668 EXPORT_SYMBOL(md_error); 6669 6670 /* seq_file implementation /proc/mdstat */ 6671 6672 static void status_unused(struct seq_file *seq) 6673 { 6674 int i = 0; 6675 struct md_rdev *rdev; 6676 6677 seq_printf(seq, "unused devices: "); 6678 6679 list_for_each_entry(rdev, &pending_raid_disks, same_set) { 6680 char b[BDEVNAME_SIZE]; 6681 i++; 6682 seq_printf(seq, "%s ", 6683 bdevname(rdev->bdev,b)); 6684 } 6685 if (!i) 6686 seq_printf(seq, "<none>"); 6687 6688 seq_printf(seq, "\n"); 6689 } 6690 6691 static void status_resync(struct seq_file *seq, struct mddev *mddev) 6692 { 6693 sector_t max_sectors, resync, res; 6694 unsigned long dt, db; 6695 sector_t rt; 6696 int scale; 6697 unsigned int per_milli; 6698 6699 if (mddev->curr_resync <= 3) 6700 resync = 0; 6701 else 6702 resync = mddev->curr_resync 6703 - atomic_read(&mddev->recovery_active); 6704 6705 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 6706 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 6707 max_sectors = mddev->resync_max_sectors; 6708 else 6709 max_sectors = mddev->dev_sectors; 6710 6711 WARN_ON(max_sectors == 0); 6712 /* Pick 'scale' such that (resync>>scale)*1000 will fit 6713 * in a sector_t, and (max_sectors>>scale) will fit in a 6714 * u32, as those are the requirements for sector_div. 6715 * Thus 'scale' must be at least 10 6716 */ 6717 scale = 10; 6718 if (sizeof(sector_t) > sizeof(unsigned long)) { 6719 while ( max_sectors/2 > (1ULL<<(scale+32))) 6720 scale++; 6721 } 6722 res = (resync>>scale)*1000; 6723 sector_div(res, (u32)((max_sectors>>scale)+1)); 6724 6725 per_milli = res; 6726 { 6727 int i, x = per_milli/50, y = 20-x; 6728 seq_printf(seq, "["); 6729 for (i = 0; i < x; i++) 6730 seq_printf(seq, "="); 6731 seq_printf(seq, ">"); 6732 for (i = 0; i < y; i++) 6733 seq_printf(seq, "."); 6734 seq_printf(seq, "] "); 6735 } 6736 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", 6737 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? 6738 "reshape" : 6739 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? 6740 "check" : 6741 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 6742 "resync" : "recovery"))), 6743 per_milli/10, per_milli % 10, 6744 (unsigned long long) resync/2, 6745 (unsigned long long) max_sectors/2); 6746 6747 /* 6748 * dt: time from mark until now 6749 * db: blocks written from mark until now 6750 * rt: remaining time 6751 * 6752 * rt is a sector_t, so could be 32bit or 64bit. 6753 * So we divide before multiply in case it is 32bit and close 6754 * to the limit. 6755 * We scale the divisor (db) by 32 to avoid losing precision 6756 * near the end of resync when the number of remaining sectors 6757 * is close to 'db'. 6758 * We then divide rt by 32 after multiplying by db to compensate. 6759 * The '+1' avoids division by zero if db is very small. 6760 */ 6761 dt = ((jiffies - mddev->resync_mark) / HZ); 6762 if (!dt) dt++; 6763 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) 6764 - mddev->resync_mark_cnt; 6765 6766 rt = max_sectors - resync; /* number of remaining sectors */ 6767 sector_div(rt, db/32+1); 6768 rt *= dt; 6769 rt >>= 5; 6770 6771 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, 6772 ((unsigned long)rt % 60)/6); 6773 6774 seq_printf(seq, " speed=%ldK/sec", db/2/dt); 6775 } 6776 6777 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 6778 { 6779 struct list_head *tmp; 6780 loff_t l = *pos; 6781 struct mddev *mddev; 6782 6783 if (l >= 0x10000) 6784 return NULL; 6785 if (!l--) 6786 /* header */ 6787 return (void*)1; 6788 6789 spin_lock(&all_mddevs_lock); 6790 list_for_each(tmp,&all_mddevs) 6791 if (!l--) { 6792 mddev = list_entry(tmp, struct mddev, all_mddevs); 6793 mddev_get(mddev); 6794 spin_unlock(&all_mddevs_lock); 6795 return mddev; 6796 } 6797 spin_unlock(&all_mddevs_lock); 6798 if (!l--) 6799 return (void*)2;/* tail */ 6800 return NULL; 6801 } 6802 6803 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 6804 { 6805 struct list_head *tmp; 6806 struct mddev *next_mddev, *mddev = v; 6807 6808 ++*pos; 6809 if (v == (void*)2) 6810 return NULL; 6811 6812 spin_lock(&all_mddevs_lock); 6813 if (v == (void*)1) 6814 tmp = all_mddevs.next; 6815 else 6816 tmp = mddev->all_mddevs.next; 6817 if (tmp != &all_mddevs) 6818 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); 6819 else { 6820 next_mddev = (void*)2; 6821 *pos = 0x10000; 6822 } 6823 spin_unlock(&all_mddevs_lock); 6824 6825 if (v != (void*)1) 6826 mddev_put(mddev); 6827 return next_mddev; 6828 6829 } 6830 6831 static void md_seq_stop(struct seq_file *seq, void *v) 6832 { 6833 struct mddev *mddev = v; 6834 6835 if (mddev && v != (void*)1 && v != (void*)2) 6836 mddev_put(mddev); 6837 } 6838 6839 static int md_seq_show(struct seq_file *seq, void *v) 6840 { 6841 struct mddev *mddev = v; 6842 sector_t sectors; 6843 struct md_rdev *rdev; 6844 6845 if (v == (void*)1) { 6846 struct md_personality *pers; 6847 seq_printf(seq, "Personalities : "); 6848 spin_lock(&pers_lock); 6849 list_for_each_entry(pers, &pers_list, list) 6850 seq_printf(seq, "[%s] ", pers->name); 6851 6852 spin_unlock(&pers_lock); 6853 seq_printf(seq, "\n"); 6854 seq->poll_event = atomic_read(&md_event_count); 6855 return 0; 6856 } 6857 if (v == (void*)2) { 6858 status_unused(seq); 6859 return 0; 6860 } 6861 6862 if (mddev_lock(mddev) < 0) 6863 return -EINTR; 6864 6865 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 6866 seq_printf(seq, "%s : %sactive", mdname(mddev), 6867 mddev->pers ? "" : "in"); 6868 if (mddev->pers) { 6869 if (mddev->ro==1) 6870 seq_printf(seq, " (read-only)"); 6871 if (mddev->ro==2) 6872 seq_printf(seq, " (auto-read-only)"); 6873 seq_printf(seq, " %s", mddev->pers->name); 6874 } 6875 6876 sectors = 0; 6877 rdev_for_each(rdev, mddev) { 6878 char b[BDEVNAME_SIZE]; 6879 seq_printf(seq, " %s[%d]", 6880 bdevname(rdev->bdev,b), rdev->desc_nr); 6881 if (test_bit(WriteMostly, &rdev->flags)) 6882 seq_printf(seq, "(W)"); 6883 if (test_bit(Faulty, &rdev->flags)) { 6884 seq_printf(seq, "(F)"); 6885 continue; 6886 } 6887 if (rdev->raid_disk < 0) 6888 seq_printf(seq, "(S)"); /* spare */ 6889 if (test_bit(Replacement, &rdev->flags)) 6890 seq_printf(seq, "(R)"); 6891 sectors += rdev->sectors; 6892 } 6893 6894 if (!list_empty(&mddev->disks)) { 6895 if (mddev->pers) 6896 seq_printf(seq, "\n %llu blocks", 6897 (unsigned long long) 6898 mddev->array_sectors / 2); 6899 else 6900 seq_printf(seq, "\n %llu blocks", 6901 (unsigned long long)sectors / 2); 6902 } 6903 if (mddev->persistent) { 6904 if (mddev->major_version != 0 || 6905 mddev->minor_version != 90) { 6906 seq_printf(seq," super %d.%d", 6907 mddev->major_version, 6908 mddev->minor_version); 6909 } 6910 } else if (mddev->external) 6911 seq_printf(seq, " super external:%s", 6912 mddev->metadata_type); 6913 else 6914 seq_printf(seq, " super non-persistent"); 6915 6916 if (mddev->pers) { 6917 mddev->pers->status(seq, mddev); 6918 seq_printf(seq, "\n "); 6919 if (mddev->pers->sync_request) { 6920 if (mddev->curr_resync > 2) { 6921 status_resync(seq, mddev); 6922 seq_printf(seq, "\n "); 6923 } else if (mddev->curr_resync >= 1) 6924 seq_printf(seq, "\tresync=DELAYED\n "); 6925 else if (mddev->recovery_cp < MaxSector) 6926 seq_printf(seq, "\tresync=PENDING\n "); 6927 } 6928 } else 6929 seq_printf(seq, "\n "); 6930 6931 bitmap_status(seq, mddev->bitmap); 6932 6933 seq_printf(seq, "\n"); 6934 } 6935 mddev_unlock(mddev); 6936 6937 return 0; 6938 } 6939 6940 static const struct seq_operations md_seq_ops = { 6941 .start = md_seq_start, 6942 .next = md_seq_next, 6943 .stop = md_seq_stop, 6944 .show = md_seq_show, 6945 }; 6946 6947 static int md_seq_open(struct inode *inode, struct file *file) 6948 { 6949 struct seq_file *seq; 6950 int error; 6951 6952 error = seq_open(file, &md_seq_ops); 6953 if (error) 6954 return error; 6955 6956 seq = file->private_data; 6957 seq->poll_event = atomic_read(&md_event_count); 6958 return error; 6959 } 6960 6961 static int md_unloading; 6962 static unsigned int mdstat_poll(struct file *filp, poll_table *wait) 6963 { 6964 struct seq_file *seq = filp->private_data; 6965 int mask; 6966 6967 if (md_unloading) 6968 return POLLIN|POLLRDNORM|POLLERR|POLLPRI;; 6969 poll_wait(filp, &md_event_waiters, wait); 6970 6971 /* always allow read */ 6972 mask = POLLIN | POLLRDNORM; 6973 6974 if (seq->poll_event != atomic_read(&md_event_count)) 6975 mask |= POLLERR | POLLPRI; 6976 return mask; 6977 } 6978 6979 static const struct file_operations md_seq_fops = { 6980 .owner = THIS_MODULE, 6981 .open = md_seq_open, 6982 .read = seq_read, 6983 .llseek = seq_lseek, 6984 .release = seq_release_private, 6985 .poll = mdstat_poll, 6986 }; 6987 6988 int register_md_personality(struct md_personality *p) 6989 { 6990 printk(KERN_INFO "md: %s personality registered for level %d\n", 6991 p->name, p->level); 6992 spin_lock(&pers_lock); 6993 list_add_tail(&p->list, &pers_list); 6994 spin_unlock(&pers_lock); 6995 return 0; 6996 } 6997 EXPORT_SYMBOL(register_md_personality); 6998 6999 int unregister_md_personality(struct md_personality *p) 7000 { 7001 printk(KERN_INFO "md: %s personality unregistered\n", p->name); 7002 spin_lock(&pers_lock); 7003 list_del_init(&p->list); 7004 spin_unlock(&pers_lock); 7005 return 0; 7006 } 7007 EXPORT_SYMBOL(unregister_md_personality); 7008 7009 static int is_mddev_idle(struct mddev *mddev, int init) 7010 { 7011 struct md_rdev *rdev; 7012 int idle; 7013 int curr_events; 7014 7015 idle = 1; 7016 rcu_read_lock(); 7017 rdev_for_each_rcu(rdev, mddev) { 7018 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 7019 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 7020 (int)part_stat_read(&disk->part0, sectors[1]) - 7021 atomic_read(&disk->sync_io); 7022 /* sync IO will cause sync_io to increase before the disk_stats 7023 * as sync_io is counted when a request starts, and 7024 * disk_stats is counted when it completes. 7025 * So resync activity will cause curr_events to be smaller than 7026 * when there was no such activity. 7027 * non-sync IO will cause disk_stat to increase without 7028 * increasing sync_io so curr_events will (eventually) 7029 * be larger than it was before. Once it becomes 7030 * substantially larger, the test below will cause 7031 * the array to appear non-idle, and resync will slow 7032 * down. 7033 * If there is a lot of outstanding resync activity when 7034 * we set last_event to curr_events, then all that activity 7035 * completing might cause the array to appear non-idle 7036 * and resync will be slowed down even though there might 7037 * not have been non-resync activity. This will only 7038 * happen once though. 'last_events' will soon reflect 7039 * the state where there is little or no outstanding 7040 * resync requests, and further resync activity will 7041 * always make curr_events less than last_events. 7042 * 7043 */ 7044 if (init || curr_events - rdev->last_events > 64) { 7045 rdev->last_events = curr_events; 7046 idle = 0; 7047 } 7048 } 7049 rcu_read_unlock(); 7050 return idle; 7051 } 7052 7053 void md_done_sync(struct mddev *mddev, int blocks, int ok) 7054 { 7055 /* another "blocks" (512byte) blocks have been synced */ 7056 atomic_sub(blocks, &mddev->recovery_active); 7057 wake_up(&mddev->recovery_wait); 7058 if (!ok) { 7059 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7060 set_bit(MD_RECOVERY_ERROR, &mddev->recovery); 7061 md_wakeup_thread(mddev->thread); 7062 // stop recovery, signal do_sync .... 7063 } 7064 } 7065 EXPORT_SYMBOL(md_done_sync); 7066 7067 /* md_write_start(mddev, bi) 7068 * If we need to update some array metadata (e.g. 'active' flag 7069 * in superblock) before writing, schedule a superblock update 7070 * and wait for it to complete. 7071 */ 7072 void md_write_start(struct mddev *mddev, struct bio *bi) 7073 { 7074 int did_change = 0; 7075 if (bio_data_dir(bi) != WRITE) 7076 return; 7077 7078 BUG_ON(mddev->ro == 1); 7079 if (mddev->ro == 2) { 7080 /* need to switch to read/write */ 7081 mddev->ro = 0; 7082 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7083 md_wakeup_thread(mddev->thread); 7084 md_wakeup_thread(mddev->sync_thread); 7085 did_change = 1; 7086 } 7087 atomic_inc(&mddev->writes_pending); 7088 if (mddev->safemode == 1) 7089 mddev->safemode = 0; 7090 if (mddev->in_sync) { 7091 spin_lock_irq(&mddev->write_lock); 7092 if (mddev->in_sync) { 7093 mddev->in_sync = 0; 7094 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7095 set_bit(MD_CHANGE_PENDING, &mddev->flags); 7096 md_wakeup_thread(mddev->thread); 7097 did_change = 1; 7098 } 7099 spin_unlock_irq(&mddev->write_lock); 7100 } 7101 if (did_change) 7102 sysfs_notify_dirent_safe(mddev->sysfs_state); 7103 wait_event(mddev->sb_wait, 7104 !test_bit(MD_CHANGE_PENDING, &mddev->flags)); 7105 } 7106 EXPORT_SYMBOL(md_write_start); 7107 7108 void md_write_end(struct mddev *mddev) 7109 { 7110 if (atomic_dec_and_test(&mddev->writes_pending)) { 7111 if (mddev->safemode == 2) 7112 md_wakeup_thread(mddev->thread); 7113 else if (mddev->safemode_delay) 7114 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 7115 } 7116 } 7117 EXPORT_SYMBOL(md_write_end); 7118 7119 /* md_allow_write(mddev) 7120 * Calling this ensures that the array is marked 'active' so that writes 7121 * may proceed without blocking. It is important to call this before 7122 * attempting a GFP_KERNEL allocation while holding the mddev lock. 7123 * Must be called with mddev_lock held. 7124 * 7125 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock 7126 * is dropped, so return -EAGAIN after notifying userspace. 7127 */ 7128 int md_allow_write(struct mddev *mddev) 7129 { 7130 if (!mddev->pers) 7131 return 0; 7132 if (mddev->ro) 7133 return 0; 7134 if (!mddev->pers->sync_request) 7135 return 0; 7136 7137 spin_lock_irq(&mddev->write_lock); 7138 if (mddev->in_sync) { 7139 mddev->in_sync = 0; 7140 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7141 set_bit(MD_CHANGE_PENDING, &mddev->flags); 7142 if (mddev->safemode_delay && 7143 mddev->safemode == 0) 7144 mddev->safemode = 1; 7145 spin_unlock_irq(&mddev->write_lock); 7146 md_update_sb(mddev, 0); 7147 sysfs_notify_dirent_safe(mddev->sysfs_state); 7148 } else 7149 spin_unlock_irq(&mddev->write_lock); 7150 7151 if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) 7152 return -EAGAIN; 7153 else 7154 return 0; 7155 } 7156 EXPORT_SYMBOL_GPL(md_allow_write); 7157 7158 #define SYNC_MARKS 10 7159 #define SYNC_MARK_STEP (3*HZ) 7160 #define UPDATE_FREQUENCY (5*60*HZ) 7161 void md_do_sync(struct md_thread *thread) 7162 { 7163 struct mddev *mddev = thread->mddev; 7164 struct mddev *mddev2; 7165 unsigned int currspeed = 0, 7166 window; 7167 sector_t max_sectors,j, io_sectors, recovery_done; 7168 unsigned long mark[SYNC_MARKS]; 7169 unsigned long update_time; 7170 sector_t mark_cnt[SYNC_MARKS]; 7171 int last_mark,m; 7172 struct list_head *tmp; 7173 sector_t last_check; 7174 int skipped = 0; 7175 struct md_rdev *rdev; 7176 char *desc, *action = NULL; 7177 struct blk_plug plug; 7178 7179 /* just incase thread restarts... */ 7180 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 7181 return; 7182 if (mddev->ro) {/* never try to sync a read-only array */ 7183 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7184 return; 7185 } 7186 7187 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7188 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 7189 desc = "data-check"; 7190 action = "check"; 7191 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 7192 desc = "requested-resync"; 7193 action = "repair"; 7194 } else 7195 desc = "resync"; 7196 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7197 desc = "reshape"; 7198 else 7199 desc = "recovery"; 7200 7201 mddev->last_sync_action = action ?: desc; 7202 7203 /* we overload curr_resync somewhat here. 7204 * 0 == not engaged in resync at all 7205 * 2 == checking that there is no conflict with another sync 7206 * 1 == like 2, but have yielded to allow conflicting resync to 7207 * commense 7208 * other == active in resync - this many blocks 7209 * 7210 * Before starting a resync we must have set curr_resync to 7211 * 2, and then checked that every "conflicting" array has curr_resync 7212 * less than ours. When we find one that is the same or higher 7213 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 7214 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 7215 * This will mean we have to start checking from the beginning again. 7216 * 7217 */ 7218 7219 do { 7220 mddev->curr_resync = 2; 7221 7222 try_again: 7223 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7224 goto skip; 7225 for_each_mddev(mddev2, tmp) { 7226 if (mddev2 == mddev) 7227 continue; 7228 if (!mddev->parallel_resync 7229 && mddev2->curr_resync 7230 && match_mddev_units(mddev, mddev2)) { 7231 DEFINE_WAIT(wq); 7232 if (mddev < mddev2 && mddev->curr_resync == 2) { 7233 /* arbitrarily yield */ 7234 mddev->curr_resync = 1; 7235 wake_up(&resync_wait); 7236 } 7237 if (mddev > mddev2 && mddev->curr_resync == 1) 7238 /* no need to wait here, we can wait the next 7239 * time 'round when curr_resync == 2 7240 */ 7241 continue; 7242 /* We need to wait 'interruptible' so as not to 7243 * contribute to the load average, and not to 7244 * be caught by 'softlockup' 7245 */ 7246 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); 7247 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 7248 mddev2->curr_resync >= mddev->curr_resync) { 7249 printk(KERN_INFO "md: delaying %s of %s" 7250 " until %s has finished (they" 7251 " share one or more physical units)\n", 7252 desc, mdname(mddev), mdname(mddev2)); 7253 mddev_put(mddev2); 7254 if (signal_pending(current)) 7255 flush_signals(current); 7256 schedule(); 7257 finish_wait(&resync_wait, &wq); 7258 goto try_again; 7259 } 7260 finish_wait(&resync_wait, &wq); 7261 } 7262 } 7263 } while (mddev->curr_resync < 2); 7264 7265 j = 0; 7266 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7267 /* resync follows the size requested by the personality, 7268 * which defaults to physical size, but can be virtual size 7269 */ 7270 max_sectors = mddev->resync_max_sectors; 7271 atomic64_set(&mddev->resync_mismatches, 0); 7272 /* we don't use the checkpoint if there's a bitmap */ 7273 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7274 j = mddev->resync_min; 7275 else if (!mddev->bitmap) 7276 j = mddev->recovery_cp; 7277 7278 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7279 max_sectors = mddev->resync_max_sectors; 7280 else { 7281 /* recovery follows the physical size of devices */ 7282 max_sectors = mddev->dev_sectors; 7283 j = MaxSector; 7284 rcu_read_lock(); 7285 rdev_for_each_rcu(rdev, mddev) 7286 if (rdev->raid_disk >= 0 && 7287 !test_bit(Faulty, &rdev->flags) && 7288 !test_bit(In_sync, &rdev->flags) && 7289 rdev->recovery_offset < j) 7290 j = rdev->recovery_offset; 7291 rcu_read_unlock(); 7292 7293 /* If there is a bitmap, we need to make sure all 7294 * writes that started before we added a spare 7295 * complete before we start doing a recovery. 7296 * Otherwise the write might complete and (via 7297 * bitmap_endwrite) set a bit in the bitmap after the 7298 * recovery has checked that bit and skipped that 7299 * region. 7300 */ 7301 if (mddev->bitmap) { 7302 mddev->pers->quiesce(mddev, 1); 7303 mddev->pers->quiesce(mddev, 0); 7304 } 7305 } 7306 7307 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); 7308 printk(KERN_INFO "md: minimum _guaranteed_ speed:" 7309 " %d KB/sec/disk.\n", speed_min(mddev)); 7310 printk(KERN_INFO "md: using maximum available idle IO bandwidth " 7311 "(but not more than %d KB/sec) for %s.\n", 7312 speed_max(mddev), desc); 7313 7314 is_mddev_idle(mddev, 1); /* this initializes IO event counters */ 7315 7316 io_sectors = 0; 7317 for (m = 0; m < SYNC_MARKS; m++) { 7318 mark[m] = jiffies; 7319 mark_cnt[m] = io_sectors; 7320 } 7321 last_mark = 0; 7322 mddev->resync_mark = mark[last_mark]; 7323 mddev->resync_mark_cnt = mark_cnt[last_mark]; 7324 7325 /* 7326 * Tune reconstruction: 7327 */ 7328 window = 32*(PAGE_SIZE/512); 7329 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", 7330 window/2, (unsigned long long)max_sectors/2); 7331 7332 atomic_set(&mddev->recovery_active, 0); 7333 last_check = 0; 7334 7335 if (j>2) { 7336 printk(KERN_INFO 7337 "md: resuming %s of %s from checkpoint.\n", 7338 desc, mdname(mddev)); 7339 mddev->curr_resync = j; 7340 } else 7341 mddev->curr_resync = 3; /* no longer delayed */ 7342 mddev->curr_resync_completed = j; 7343 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 7344 md_new_event(mddev); 7345 update_time = jiffies; 7346 7347 blk_start_plug(&plug); 7348 while (j < max_sectors) { 7349 sector_t sectors; 7350 7351 skipped = 0; 7352 7353 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 7354 ((mddev->curr_resync > mddev->curr_resync_completed && 7355 (mddev->curr_resync - mddev->curr_resync_completed) 7356 > (max_sectors >> 4)) || 7357 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || 7358 (j - mddev->curr_resync_completed)*2 7359 >= mddev->resync_max - mddev->curr_resync_completed 7360 )) { 7361 /* time to update curr_resync_completed */ 7362 wait_event(mddev->recovery_wait, 7363 atomic_read(&mddev->recovery_active) == 0); 7364 mddev->curr_resync_completed = j; 7365 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 7366 j > mddev->recovery_cp) 7367 mddev->recovery_cp = j; 7368 update_time = jiffies; 7369 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7370 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 7371 } 7372 7373 while (j >= mddev->resync_max && 7374 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 7375 /* As this condition is controlled by user-space, 7376 * we can block indefinitely, so use '_interruptible' 7377 * to avoid triggering warnings. 7378 */ 7379 flush_signals(current); /* just in case */ 7380 wait_event_interruptible(mddev->recovery_wait, 7381 mddev->resync_max > j 7382 || test_bit(MD_RECOVERY_INTR, 7383 &mddev->recovery)); 7384 } 7385 7386 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7387 break; 7388 7389 sectors = mddev->pers->sync_request(mddev, j, &skipped, 7390 currspeed < speed_min(mddev)); 7391 if (sectors == 0) { 7392 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7393 break; 7394 } 7395 7396 if (!skipped) { /* actual IO requested */ 7397 io_sectors += sectors; 7398 atomic_add(sectors, &mddev->recovery_active); 7399 } 7400 7401 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7402 break; 7403 7404 j += sectors; 7405 if (j > 2) 7406 mddev->curr_resync = j; 7407 mddev->curr_mark_cnt = io_sectors; 7408 if (last_check == 0) 7409 /* this is the earliest that rebuild will be 7410 * visible in /proc/mdstat 7411 */ 7412 md_new_event(mddev); 7413 7414 if (last_check + window > io_sectors || j == max_sectors) 7415 continue; 7416 7417 last_check = io_sectors; 7418 repeat: 7419 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 7420 /* step marks */ 7421 int next = (last_mark+1) % SYNC_MARKS; 7422 7423 mddev->resync_mark = mark[next]; 7424 mddev->resync_mark_cnt = mark_cnt[next]; 7425 mark[next] = jiffies; 7426 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 7427 last_mark = next; 7428 } 7429 7430 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7431 break; 7432 7433 /* 7434 * this loop exits only if either when we are slower than 7435 * the 'hard' speed limit, or the system was IO-idle for 7436 * a jiffy. 7437 * the system might be non-idle CPU-wise, but we only care 7438 * about not overloading the IO subsystem. (things like an 7439 * e2fsck being done on the RAID array should execute fast) 7440 */ 7441 cond_resched(); 7442 7443 recovery_done = io_sectors - atomic_read(&mddev->recovery_active); 7444 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 7445 /((jiffies-mddev->resync_mark)/HZ +1) +1; 7446 7447 if (currspeed > speed_min(mddev)) { 7448 if ((currspeed > speed_max(mddev)) || 7449 !is_mddev_idle(mddev, 0)) { 7450 msleep(500); 7451 goto repeat; 7452 } 7453 } 7454 } 7455 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, 7456 test_bit(MD_RECOVERY_INTR, &mddev->recovery) 7457 ? "interrupted" : "done"); 7458 /* 7459 * this also signals 'finished resyncing' to md_stop 7460 */ 7461 blk_finish_plug(&plug); 7462 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 7463 7464 /* tell personality that we are finished */ 7465 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); 7466 7467 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && 7468 mddev->curr_resync > 2) { 7469 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7470 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 7471 if (mddev->curr_resync >= mddev->recovery_cp) { 7472 printk(KERN_INFO 7473 "md: checkpointing %s of %s.\n", 7474 desc, mdname(mddev)); 7475 if (test_bit(MD_RECOVERY_ERROR, 7476 &mddev->recovery)) 7477 mddev->recovery_cp = 7478 mddev->curr_resync_completed; 7479 else 7480 mddev->recovery_cp = 7481 mddev->curr_resync; 7482 } 7483 } else 7484 mddev->recovery_cp = MaxSector; 7485 } else { 7486 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7487 mddev->curr_resync = MaxSector; 7488 rcu_read_lock(); 7489 rdev_for_each_rcu(rdev, mddev) 7490 if (rdev->raid_disk >= 0 && 7491 mddev->delta_disks >= 0 && 7492 !test_bit(Faulty, &rdev->flags) && 7493 !test_bit(In_sync, &rdev->flags) && 7494 rdev->recovery_offset < mddev->curr_resync) 7495 rdev->recovery_offset = mddev->curr_resync; 7496 rcu_read_unlock(); 7497 } 7498 } 7499 skip: 7500 set_bit(MD_CHANGE_DEVS, &mddev->flags); 7501 7502 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 7503 /* We completed so min/max setting can be forgotten if used. */ 7504 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7505 mddev->resync_min = 0; 7506 mddev->resync_max = MaxSector; 7507 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7508 mddev->resync_min = mddev->curr_resync_completed; 7509 mddev->curr_resync = 0; 7510 wake_up(&resync_wait); 7511 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 7512 md_wakeup_thread(mddev->thread); 7513 return; 7514 } 7515 EXPORT_SYMBOL_GPL(md_do_sync); 7516 7517 static int remove_and_add_spares(struct mddev *mddev, 7518 struct md_rdev *this) 7519 { 7520 struct md_rdev *rdev; 7521 int spares = 0; 7522 int removed = 0; 7523 7524 rdev_for_each(rdev, mddev) 7525 if ((this == NULL || rdev == this) && 7526 rdev->raid_disk >= 0 && 7527 !test_bit(Blocked, &rdev->flags) && 7528 (test_bit(Faulty, &rdev->flags) || 7529 ! test_bit(In_sync, &rdev->flags)) && 7530 atomic_read(&rdev->nr_pending)==0) { 7531 if (mddev->pers->hot_remove_disk( 7532 mddev, rdev) == 0) { 7533 sysfs_unlink_rdev(mddev, rdev); 7534 rdev->raid_disk = -1; 7535 removed++; 7536 } 7537 } 7538 if (removed && mddev->kobj.sd) 7539 sysfs_notify(&mddev->kobj, NULL, "degraded"); 7540 7541 if (this) 7542 goto no_add; 7543 7544 rdev_for_each(rdev, mddev) { 7545 if (rdev->raid_disk >= 0 && 7546 !test_bit(In_sync, &rdev->flags) && 7547 !test_bit(Faulty, &rdev->flags)) 7548 spares++; 7549 if (rdev->raid_disk >= 0) 7550 continue; 7551 if (test_bit(Faulty, &rdev->flags)) 7552 continue; 7553 if (mddev->ro && 7554 ! (rdev->saved_raid_disk >= 0 && 7555 !test_bit(Bitmap_sync, &rdev->flags))) 7556 continue; 7557 7558 if (rdev->saved_raid_disk < 0) 7559 rdev->recovery_offset = 0; 7560 if (mddev->pers-> 7561 hot_add_disk(mddev, rdev) == 0) { 7562 if (sysfs_link_rdev(mddev, rdev)) 7563 /* failure here is OK */; 7564 spares++; 7565 md_new_event(mddev); 7566 set_bit(MD_CHANGE_DEVS, &mddev->flags); 7567 } 7568 } 7569 no_add: 7570 if (removed) 7571 set_bit(MD_CHANGE_DEVS, &mddev->flags); 7572 return spares; 7573 } 7574 7575 static void md_start_sync(struct work_struct *ws) 7576 { 7577 struct mddev *mddev = container_of(ws, struct mddev, del_work); 7578 7579 mddev->sync_thread = md_register_thread(md_do_sync, 7580 mddev, 7581 "resync"); 7582 if (!mddev->sync_thread) { 7583 printk(KERN_ERR "%s: could not start resync" 7584 " thread...\n", 7585 mdname(mddev)); 7586 /* leave the spares where they are, it shouldn't hurt */ 7587 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 7588 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 7589 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 7590 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 7591 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 7592 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 7593 &mddev->recovery)) 7594 if (mddev->sysfs_action) 7595 sysfs_notify_dirent_safe(mddev->sysfs_action); 7596 } else 7597 md_wakeup_thread(mddev->sync_thread); 7598 sysfs_notify_dirent_safe(mddev->sysfs_action); 7599 md_new_event(mddev); 7600 } 7601 7602 /* 7603 * This routine is regularly called by all per-raid-array threads to 7604 * deal with generic issues like resync and super-block update. 7605 * Raid personalities that don't have a thread (linear/raid0) do not 7606 * need this as they never do any recovery or update the superblock. 7607 * 7608 * It does not do any resync itself, but rather "forks" off other threads 7609 * to do that as needed. 7610 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 7611 * "->recovery" and create a thread at ->sync_thread. 7612 * When the thread finishes it sets MD_RECOVERY_DONE 7613 * and wakeups up this thread which will reap the thread and finish up. 7614 * This thread also removes any faulty devices (with nr_pending == 0). 7615 * 7616 * The overall approach is: 7617 * 1/ if the superblock needs updating, update it. 7618 * 2/ If a recovery thread is running, don't do anything else. 7619 * 3/ If recovery has finished, clean up, possibly marking spares active. 7620 * 4/ If there are any faulty devices, remove them. 7621 * 5/ If array is degraded, try to add spares devices 7622 * 6/ If array has spares or is not in-sync, start a resync thread. 7623 */ 7624 void md_check_recovery(struct mddev *mddev) 7625 { 7626 if (mddev->suspended) 7627 return; 7628 7629 if (mddev->bitmap) 7630 bitmap_daemon_work(mddev); 7631 7632 if (signal_pending(current)) { 7633 if (mddev->pers->sync_request && !mddev->external) { 7634 printk(KERN_INFO "md: %s in immediate safe mode\n", 7635 mdname(mddev)); 7636 mddev->safemode = 2; 7637 } 7638 flush_signals(current); 7639 } 7640 7641 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 7642 return; 7643 if ( ! ( 7644 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || 7645 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 7646 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 7647 (mddev->external == 0 && mddev->safemode == 1) || 7648 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 7649 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 7650 )) 7651 return; 7652 7653 if (mddev_trylock(mddev)) { 7654 int spares = 0; 7655 7656 if (mddev->ro) { 7657 /* On a read-only array we can: 7658 * - remove failed devices 7659 * - add already-in_sync devices if the array itself 7660 * is in-sync. 7661 * As we only add devices that are already in-sync, 7662 * we can activate the spares immediately. 7663 */ 7664 remove_and_add_spares(mddev, NULL); 7665 /* There is no thread, but we need to call 7666 * ->spare_active and clear saved_raid_disk 7667 */ 7668 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7669 md_reap_sync_thread(mddev); 7670 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7671 goto unlock; 7672 } 7673 7674 if (!mddev->external) { 7675 int did_change = 0; 7676 spin_lock_irq(&mddev->write_lock); 7677 if (mddev->safemode && 7678 !atomic_read(&mddev->writes_pending) && 7679 !mddev->in_sync && 7680 mddev->recovery_cp == MaxSector) { 7681 mddev->in_sync = 1; 7682 did_change = 1; 7683 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7684 } 7685 if (mddev->safemode == 1) 7686 mddev->safemode = 0; 7687 spin_unlock_irq(&mddev->write_lock); 7688 if (did_change) 7689 sysfs_notify_dirent_safe(mddev->sysfs_state); 7690 } 7691 7692 if (mddev->flags & MD_UPDATE_SB_FLAGS) 7693 md_update_sb(mddev, 0); 7694 7695 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 7696 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 7697 /* resync/recovery still happening */ 7698 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7699 goto unlock; 7700 } 7701 if (mddev->sync_thread) { 7702 md_reap_sync_thread(mddev); 7703 goto unlock; 7704 } 7705 /* Set RUNNING before clearing NEEDED to avoid 7706 * any transients in the value of "sync_action". 7707 */ 7708 mddev->curr_resync_completed = 0; 7709 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 7710 /* Clear some bits that don't mean anything, but 7711 * might be left set 7712 */ 7713 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 7714 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 7715 7716 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 7717 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 7718 goto not_running; 7719 /* no recovery is running. 7720 * remove any failed drives, then 7721 * add spares if possible. 7722 * Spares are also removed and re-added, to allow 7723 * the personality to fail the re-add. 7724 */ 7725 7726 if (mddev->reshape_position != MaxSector) { 7727 if (mddev->pers->check_reshape == NULL || 7728 mddev->pers->check_reshape(mddev) != 0) 7729 /* Cannot proceed */ 7730 goto not_running; 7731 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 7732 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7733 } else if ((spares = remove_and_add_spares(mddev, NULL))) { 7734 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 7735 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 7736 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 7737 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7738 } else if (mddev->recovery_cp < MaxSector) { 7739 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 7740 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7741 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 7742 /* nothing to be done ... */ 7743 goto not_running; 7744 7745 if (mddev->pers->sync_request) { 7746 if (spares) { 7747 /* We are adding a device or devices to an array 7748 * which has the bitmap stored on all devices. 7749 * So make sure all bitmap pages get written 7750 */ 7751 bitmap_write_all(mddev->bitmap); 7752 } 7753 INIT_WORK(&mddev->del_work, md_start_sync); 7754 queue_work(md_misc_wq, &mddev->del_work); 7755 goto unlock; 7756 } 7757 not_running: 7758 if (!mddev->sync_thread) { 7759 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 7760 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 7761 &mddev->recovery)) 7762 if (mddev->sysfs_action) 7763 sysfs_notify_dirent_safe(mddev->sysfs_action); 7764 } 7765 unlock: 7766 wake_up(&mddev->sb_wait); 7767 mddev_unlock(mddev); 7768 } 7769 } 7770 EXPORT_SYMBOL(md_check_recovery); 7771 7772 void md_reap_sync_thread(struct mddev *mddev) 7773 { 7774 struct md_rdev *rdev; 7775 7776 /* resync has finished, collect result */ 7777 md_unregister_thread(&mddev->sync_thread); 7778 wake_up(&resync_wait); 7779 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 7780 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 7781 /* success...*/ 7782 /* activate any spares */ 7783 if (mddev->pers->spare_active(mddev)) { 7784 sysfs_notify(&mddev->kobj, NULL, 7785 "degraded"); 7786 set_bit(MD_CHANGE_DEVS, &mddev->flags); 7787 } 7788 } 7789 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 7790 mddev->pers->finish_reshape) 7791 mddev->pers->finish_reshape(mddev); 7792 7793 /* If array is no-longer degraded, then any saved_raid_disk 7794 * information must be scrapped. 7795 */ 7796 if (!mddev->degraded) 7797 rdev_for_each(rdev, mddev) 7798 rdev->saved_raid_disk = -1; 7799 7800 md_update_sb(mddev, 1); 7801 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 7802 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 7803 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 7804 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 7805 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 7806 /* flag recovery needed just to double check */ 7807 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7808 sysfs_notify_dirent_safe(mddev->sysfs_action); 7809 md_new_event(mddev); 7810 if (mddev->event_work.func) 7811 queue_work(md_misc_wq, &mddev->event_work); 7812 } 7813 EXPORT_SYMBOL(md_reap_sync_thread); 7814 7815 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) 7816 { 7817 sysfs_notify_dirent_safe(rdev->sysfs_state); 7818 wait_event_timeout(rdev->blocked_wait, 7819 !test_bit(Blocked, &rdev->flags) && 7820 !test_bit(BlockedBadBlocks, &rdev->flags), 7821 msecs_to_jiffies(5000)); 7822 rdev_dec_pending(rdev, mddev); 7823 } 7824 EXPORT_SYMBOL(md_wait_for_blocked_rdev); 7825 7826 void md_finish_reshape(struct mddev *mddev) 7827 { 7828 /* called be personality module when reshape completes. */ 7829 struct md_rdev *rdev; 7830 7831 rdev_for_each(rdev, mddev) { 7832 if (rdev->data_offset > rdev->new_data_offset) 7833 rdev->sectors += rdev->data_offset - rdev->new_data_offset; 7834 else 7835 rdev->sectors -= rdev->new_data_offset - rdev->data_offset; 7836 rdev->data_offset = rdev->new_data_offset; 7837 } 7838 } 7839 EXPORT_SYMBOL(md_finish_reshape); 7840 7841 /* Bad block management. 7842 * We can record which blocks on each device are 'bad' and so just 7843 * fail those blocks, or that stripe, rather than the whole device. 7844 * Entries in the bad-block table are 64bits wide. This comprises: 7845 * Length of bad-range, in sectors: 0-511 for lengths 1-512 7846 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) 7847 * A 'shift' can be set so that larger blocks are tracked and 7848 * consequently larger devices can be covered. 7849 * 'Acknowledged' flag - 1 bit. - the most significant bit. 7850 * 7851 * Locking of the bad-block table uses a seqlock so md_is_badblock 7852 * might need to retry if it is very unlucky. 7853 * We will sometimes want to check for bad blocks in a bi_end_io function, 7854 * so we use the write_seqlock_irq variant. 7855 * 7856 * When looking for a bad block we specify a range and want to 7857 * know if any block in the range is bad. So we binary-search 7858 * to the last range that starts at-or-before the given endpoint, 7859 * (or "before the sector after the target range") 7860 * then see if it ends after the given start. 7861 * We return 7862 * 0 if there are no known bad blocks in the range 7863 * 1 if there are known bad block which are all acknowledged 7864 * -1 if there are bad blocks which have not yet been acknowledged in metadata. 7865 * plus the start/length of the first bad section we overlap. 7866 */ 7867 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, 7868 sector_t *first_bad, int *bad_sectors) 7869 { 7870 int hi; 7871 int lo; 7872 u64 *p = bb->page; 7873 int rv; 7874 sector_t target = s + sectors; 7875 unsigned seq; 7876 7877 if (bb->shift > 0) { 7878 /* round the start down, and the end up */ 7879 s >>= bb->shift; 7880 target += (1<<bb->shift) - 1; 7881 target >>= bb->shift; 7882 sectors = target - s; 7883 } 7884 /* 'target' is now the first block after the bad range */ 7885 7886 retry: 7887 seq = read_seqbegin(&bb->lock); 7888 lo = 0; 7889 rv = 0; 7890 hi = bb->count; 7891 7892 /* Binary search between lo and hi for 'target' 7893 * i.e. for the last range that starts before 'target' 7894 */ 7895 /* INVARIANT: ranges before 'lo' and at-or-after 'hi' 7896 * are known not to be the last range before target. 7897 * VARIANT: hi-lo is the number of possible 7898 * ranges, and decreases until it reaches 1 7899 */ 7900 while (hi - lo > 1) { 7901 int mid = (lo + hi) / 2; 7902 sector_t a = BB_OFFSET(p[mid]); 7903 if (a < target) 7904 /* This could still be the one, earlier ranges 7905 * could not. */ 7906 lo = mid; 7907 else 7908 /* This and later ranges are definitely out. */ 7909 hi = mid; 7910 } 7911 /* 'lo' might be the last that started before target, but 'hi' isn't */ 7912 if (hi > lo) { 7913 /* need to check all range that end after 's' to see if 7914 * any are unacknowledged. 7915 */ 7916 while (lo >= 0 && 7917 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { 7918 if (BB_OFFSET(p[lo]) < target) { 7919 /* starts before the end, and finishes after 7920 * the start, so they must overlap 7921 */ 7922 if (rv != -1 && BB_ACK(p[lo])) 7923 rv = 1; 7924 else 7925 rv = -1; 7926 *first_bad = BB_OFFSET(p[lo]); 7927 *bad_sectors = BB_LEN(p[lo]); 7928 } 7929 lo--; 7930 } 7931 } 7932 7933 if (read_seqretry(&bb->lock, seq)) 7934 goto retry; 7935 7936 return rv; 7937 } 7938 EXPORT_SYMBOL_GPL(md_is_badblock); 7939 7940 /* 7941 * Add a range of bad blocks to the table. 7942 * This might extend the table, or might contract it 7943 * if two adjacent ranges can be merged. 7944 * We binary-search to find the 'insertion' point, then 7945 * decide how best to handle it. 7946 */ 7947 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, 7948 int acknowledged) 7949 { 7950 u64 *p; 7951 int lo, hi; 7952 int rv = 1; 7953 unsigned long flags; 7954 7955 if (bb->shift < 0) 7956 /* badblocks are disabled */ 7957 return 0; 7958 7959 if (bb->shift) { 7960 /* round the start down, and the end up */ 7961 sector_t next = s + sectors; 7962 s >>= bb->shift; 7963 next += (1<<bb->shift) - 1; 7964 next >>= bb->shift; 7965 sectors = next - s; 7966 } 7967 7968 write_seqlock_irqsave(&bb->lock, flags); 7969 7970 p = bb->page; 7971 lo = 0; 7972 hi = bb->count; 7973 /* Find the last range that starts at-or-before 's' */ 7974 while (hi - lo > 1) { 7975 int mid = (lo + hi) / 2; 7976 sector_t a = BB_OFFSET(p[mid]); 7977 if (a <= s) 7978 lo = mid; 7979 else 7980 hi = mid; 7981 } 7982 if (hi > lo && BB_OFFSET(p[lo]) > s) 7983 hi = lo; 7984 7985 if (hi > lo) { 7986 /* we found a range that might merge with the start 7987 * of our new range 7988 */ 7989 sector_t a = BB_OFFSET(p[lo]); 7990 sector_t e = a + BB_LEN(p[lo]); 7991 int ack = BB_ACK(p[lo]); 7992 if (e >= s) { 7993 /* Yes, we can merge with a previous range */ 7994 if (s == a && s + sectors >= e) 7995 /* new range covers old */ 7996 ack = acknowledged; 7997 else 7998 ack = ack && acknowledged; 7999 8000 if (e < s + sectors) 8001 e = s + sectors; 8002 if (e - a <= BB_MAX_LEN) { 8003 p[lo] = BB_MAKE(a, e-a, ack); 8004 s = e; 8005 } else { 8006 /* does not all fit in one range, 8007 * make p[lo] maximal 8008 */ 8009 if (BB_LEN(p[lo]) != BB_MAX_LEN) 8010 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); 8011 s = a + BB_MAX_LEN; 8012 } 8013 sectors = e - s; 8014 } 8015 } 8016 if (sectors && hi < bb->count) { 8017 /* 'hi' points to the first range that starts after 's'. 8018 * Maybe we can merge with the start of that range */ 8019 sector_t a = BB_OFFSET(p[hi]); 8020 sector_t e = a + BB_LEN(p[hi]); 8021 int ack = BB_ACK(p[hi]); 8022 if (a <= s + sectors) { 8023 /* merging is possible */ 8024 if (e <= s + sectors) { 8025 /* full overlap */ 8026 e = s + sectors; 8027 ack = acknowledged; 8028 } else 8029 ack = ack && acknowledged; 8030 8031 a = s; 8032 if (e - a <= BB_MAX_LEN) { 8033 p[hi] = BB_MAKE(a, e-a, ack); 8034 s = e; 8035 } else { 8036 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); 8037 s = a + BB_MAX_LEN; 8038 } 8039 sectors = e - s; 8040 lo = hi; 8041 hi++; 8042 } 8043 } 8044 if (sectors == 0 && hi < bb->count) { 8045 /* we might be able to combine lo and hi */ 8046 /* Note: 's' is at the end of 'lo' */ 8047 sector_t a = BB_OFFSET(p[hi]); 8048 int lolen = BB_LEN(p[lo]); 8049 int hilen = BB_LEN(p[hi]); 8050 int newlen = lolen + hilen - (s - a); 8051 if (s >= a && newlen < BB_MAX_LEN) { 8052 /* yes, we can combine them */ 8053 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); 8054 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); 8055 memmove(p + hi, p + hi + 1, 8056 (bb->count - hi - 1) * 8); 8057 bb->count--; 8058 } 8059 } 8060 while (sectors) { 8061 /* didn't merge (it all). 8062 * Need to add a range just before 'hi' */ 8063 if (bb->count >= MD_MAX_BADBLOCKS) { 8064 /* No room for more */ 8065 rv = 0; 8066 break; 8067 } else { 8068 int this_sectors = sectors; 8069 memmove(p + hi + 1, p + hi, 8070 (bb->count - hi) * 8); 8071 bb->count++; 8072 8073 if (this_sectors > BB_MAX_LEN) 8074 this_sectors = BB_MAX_LEN; 8075 p[hi] = BB_MAKE(s, this_sectors, acknowledged); 8076 sectors -= this_sectors; 8077 s += this_sectors; 8078 } 8079 } 8080 8081 bb->changed = 1; 8082 if (!acknowledged) 8083 bb->unacked_exist = 1; 8084 write_sequnlock_irqrestore(&bb->lock, flags); 8085 8086 return rv; 8087 } 8088 8089 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 8090 int is_new) 8091 { 8092 int rv; 8093 if (is_new) 8094 s += rdev->new_data_offset; 8095 else 8096 s += rdev->data_offset; 8097 rv = md_set_badblocks(&rdev->badblocks, 8098 s, sectors, 0); 8099 if (rv) { 8100 /* Make sure they get written out promptly */ 8101 sysfs_notify_dirent_safe(rdev->sysfs_state); 8102 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); 8103 md_wakeup_thread(rdev->mddev->thread); 8104 } 8105 return rv; 8106 } 8107 EXPORT_SYMBOL_GPL(rdev_set_badblocks); 8108 8109 /* 8110 * Remove a range of bad blocks from the table. 8111 * This may involve extending the table if we spilt a region, 8112 * but it must not fail. So if the table becomes full, we just 8113 * drop the remove request. 8114 */ 8115 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) 8116 { 8117 u64 *p; 8118 int lo, hi; 8119 sector_t target = s + sectors; 8120 int rv = 0; 8121 8122 if (bb->shift > 0) { 8123 /* When clearing we round the start up and the end down. 8124 * This should not matter as the shift should align with 8125 * the block size and no rounding should ever be needed. 8126 * However it is better the think a block is bad when it 8127 * isn't than to think a block is not bad when it is. 8128 */ 8129 s += (1<<bb->shift) - 1; 8130 s >>= bb->shift; 8131 target >>= bb->shift; 8132 sectors = target - s; 8133 } 8134 8135 write_seqlock_irq(&bb->lock); 8136 8137 p = bb->page; 8138 lo = 0; 8139 hi = bb->count; 8140 /* Find the last range that starts before 'target' */ 8141 while (hi - lo > 1) { 8142 int mid = (lo + hi) / 2; 8143 sector_t a = BB_OFFSET(p[mid]); 8144 if (a < target) 8145 lo = mid; 8146 else 8147 hi = mid; 8148 } 8149 if (hi > lo) { 8150 /* p[lo] is the last range that could overlap the 8151 * current range. Earlier ranges could also overlap, 8152 * but only this one can overlap the end of the range. 8153 */ 8154 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { 8155 /* Partial overlap, leave the tail of this range */ 8156 int ack = BB_ACK(p[lo]); 8157 sector_t a = BB_OFFSET(p[lo]); 8158 sector_t end = a + BB_LEN(p[lo]); 8159 8160 if (a < s) { 8161 /* we need to split this range */ 8162 if (bb->count >= MD_MAX_BADBLOCKS) { 8163 rv = -ENOSPC; 8164 goto out; 8165 } 8166 memmove(p+lo+1, p+lo, (bb->count - lo) * 8); 8167 bb->count++; 8168 p[lo] = BB_MAKE(a, s-a, ack); 8169 lo++; 8170 } 8171 p[lo] = BB_MAKE(target, end - target, ack); 8172 /* there is no longer an overlap */ 8173 hi = lo; 8174 lo--; 8175 } 8176 while (lo >= 0 && 8177 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { 8178 /* This range does overlap */ 8179 if (BB_OFFSET(p[lo]) < s) { 8180 /* Keep the early parts of this range. */ 8181 int ack = BB_ACK(p[lo]); 8182 sector_t start = BB_OFFSET(p[lo]); 8183 p[lo] = BB_MAKE(start, s - start, ack); 8184 /* now low doesn't overlap, so.. */ 8185 break; 8186 } 8187 lo--; 8188 } 8189 /* 'lo' is strictly before, 'hi' is strictly after, 8190 * anything between needs to be discarded 8191 */ 8192 if (hi - lo > 1) { 8193 memmove(p+lo+1, p+hi, (bb->count - hi) * 8); 8194 bb->count -= (hi - lo - 1); 8195 } 8196 } 8197 8198 bb->changed = 1; 8199 out: 8200 write_sequnlock_irq(&bb->lock); 8201 return rv; 8202 } 8203 8204 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 8205 int is_new) 8206 { 8207 if (is_new) 8208 s += rdev->new_data_offset; 8209 else 8210 s += rdev->data_offset; 8211 return md_clear_badblocks(&rdev->badblocks, 8212 s, sectors); 8213 } 8214 EXPORT_SYMBOL_GPL(rdev_clear_badblocks); 8215 8216 /* 8217 * Acknowledge all bad blocks in a list. 8218 * This only succeeds if ->changed is clear. It is used by 8219 * in-kernel metadata updates 8220 */ 8221 void md_ack_all_badblocks(struct badblocks *bb) 8222 { 8223 if (bb->page == NULL || bb->changed) 8224 /* no point even trying */ 8225 return; 8226 write_seqlock_irq(&bb->lock); 8227 8228 if (bb->changed == 0 && bb->unacked_exist) { 8229 u64 *p = bb->page; 8230 int i; 8231 for (i = 0; i < bb->count ; i++) { 8232 if (!BB_ACK(p[i])) { 8233 sector_t start = BB_OFFSET(p[i]); 8234 int len = BB_LEN(p[i]); 8235 p[i] = BB_MAKE(start, len, 1); 8236 } 8237 } 8238 bb->unacked_exist = 0; 8239 } 8240 write_sequnlock_irq(&bb->lock); 8241 } 8242 EXPORT_SYMBOL_GPL(md_ack_all_badblocks); 8243 8244 /* sysfs access to bad-blocks list. 8245 * We present two files. 8246 * 'bad-blocks' lists sector numbers and lengths of ranges that 8247 * are recorded as bad. The list is truncated to fit within 8248 * the one-page limit of sysfs. 8249 * Writing "sector length" to this file adds an acknowledged 8250 * bad block list. 8251 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet 8252 * been acknowledged. Writing to this file adds bad blocks 8253 * without acknowledging them. This is largely for testing. 8254 */ 8255 8256 static ssize_t 8257 badblocks_show(struct badblocks *bb, char *page, int unack) 8258 { 8259 size_t len; 8260 int i; 8261 u64 *p = bb->page; 8262 unsigned seq; 8263 8264 if (bb->shift < 0) 8265 return 0; 8266 8267 retry: 8268 seq = read_seqbegin(&bb->lock); 8269 8270 len = 0; 8271 i = 0; 8272 8273 while (len < PAGE_SIZE && i < bb->count) { 8274 sector_t s = BB_OFFSET(p[i]); 8275 unsigned int length = BB_LEN(p[i]); 8276 int ack = BB_ACK(p[i]); 8277 i++; 8278 8279 if (unack && ack) 8280 continue; 8281 8282 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", 8283 (unsigned long long)s << bb->shift, 8284 length << bb->shift); 8285 } 8286 if (unack && len == 0) 8287 bb->unacked_exist = 0; 8288 8289 if (read_seqretry(&bb->lock, seq)) 8290 goto retry; 8291 8292 return len; 8293 } 8294 8295 #define DO_DEBUG 1 8296 8297 static ssize_t 8298 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) 8299 { 8300 unsigned long long sector; 8301 int length; 8302 char newline; 8303 #ifdef DO_DEBUG 8304 /* Allow clearing via sysfs *only* for testing/debugging. 8305 * Normally only a successful write may clear a badblock 8306 */ 8307 int clear = 0; 8308 if (page[0] == '-') { 8309 clear = 1; 8310 page++; 8311 } 8312 #endif /* DO_DEBUG */ 8313 8314 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { 8315 case 3: 8316 if (newline != '\n') 8317 return -EINVAL; 8318 case 2: 8319 if (length <= 0) 8320 return -EINVAL; 8321 break; 8322 default: 8323 return -EINVAL; 8324 } 8325 8326 #ifdef DO_DEBUG 8327 if (clear) { 8328 md_clear_badblocks(bb, sector, length); 8329 return len; 8330 } 8331 #endif /* DO_DEBUG */ 8332 if (md_set_badblocks(bb, sector, length, !unack)) 8333 return len; 8334 else 8335 return -ENOSPC; 8336 } 8337 8338 static int md_notify_reboot(struct notifier_block *this, 8339 unsigned long code, void *x) 8340 { 8341 struct list_head *tmp; 8342 struct mddev *mddev; 8343 int need_delay = 0; 8344 8345 for_each_mddev(mddev, tmp) { 8346 if (mddev_trylock(mddev)) { 8347 if (mddev->pers) 8348 __md_stop_writes(mddev); 8349 if (mddev->persistent) 8350 mddev->safemode = 2; 8351 mddev_unlock(mddev); 8352 } 8353 need_delay = 1; 8354 } 8355 /* 8356 * certain more exotic SCSI devices are known to be 8357 * volatile wrt too early system reboots. While the 8358 * right place to handle this issue is the given 8359 * driver, we do want to have a safe RAID driver ... 8360 */ 8361 if (need_delay) 8362 mdelay(1000*1); 8363 8364 return NOTIFY_DONE; 8365 } 8366 8367 static struct notifier_block md_notifier = { 8368 .notifier_call = md_notify_reboot, 8369 .next = NULL, 8370 .priority = INT_MAX, /* before any real devices */ 8371 }; 8372 8373 static void md_geninit(void) 8374 { 8375 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 8376 8377 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); 8378 } 8379 8380 static int __init md_init(void) 8381 { 8382 int ret = -ENOMEM; 8383 8384 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); 8385 if (!md_wq) 8386 goto err_wq; 8387 8388 md_misc_wq = alloc_workqueue("md_misc", 0, 0); 8389 if (!md_misc_wq) 8390 goto err_misc_wq; 8391 8392 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) 8393 goto err_md; 8394 8395 if ((ret = register_blkdev(0, "mdp")) < 0) 8396 goto err_mdp; 8397 mdp_major = ret; 8398 8399 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, 8400 md_probe, NULL, NULL); 8401 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, 8402 md_probe, NULL, NULL); 8403 8404 register_reboot_notifier(&md_notifier); 8405 raid_table_header = register_sysctl_table(raid_root_table); 8406 8407 md_geninit(); 8408 return 0; 8409 8410 err_mdp: 8411 unregister_blkdev(MD_MAJOR, "md"); 8412 err_md: 8413 destroy_workqueue(md_misc_wq); 8414 err_misc_wq: 8415 destroy_workqueue(md_wq); 8416 err_wq: 8417 return ret; 8418 } 8419 8420 #ifndef MODULE 8421 8422 /* 8423 * Searches all registered partitions for autorun RAID arrays 8424 * at boot time. 8425 */ 8426 8427 static LIST_HEAD(all_detected_devices); 8428 struct detected_devices_node { 8429 struct list_head list; 8430 dev_t dev; 8431 }; 8432 8433 void md_autodetect_dev(dev_t dev) 8434 { 8435 struct detected_devices_node *node_detected_dev; 8436 8437 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); 8438 if (node_detected_dev) { 8439 node_detected_dev->dev = dev; 8440 list_add_tail(&node_detected_dev->list, &all_detected_devices); 8441 } else { 8442 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" 8443 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); 8444 } 8445 } 8446 8447 static void autostart_arrays(int part) 8448 { 8449 struct md_rdev *rdev; 8450 struct detected_devices_node *node_detected_dev; 8451 dev_t dev; 8452 int i_scanned, i_passed; 8453 8454 i_scanned = 0; 8455 i_passed = 0; 8456 8457 printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); 8458 8459 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { 8460 i_scanned++; 8461 node_detected_dev = list_entry(all_detected_devices.next, 8462 struct detected_devices_node, list); 8463 list_del(&node_detected_dev->list); 8464 dev = node_detected_dev->dev; 8465 kfree(node_detected_dev); 8466 rdev = md_import_device(dev,0, 90); 8467 if (IS_ERR(rdev)) 8468 continue; 8469 8470 if (test_bit(Faulty, &rdev->flags)) 8471 continue; 8472 8473 set_bit(AutoDetected, &rdev->flags); 8474 list_add(&rdev->same_set, &pending_raid_disks); 8475 i_passed++; 8476 } 8477 8478 printk(KERN_INFO "md: Scanned %d and added %d devices.\n", 8479 i_scanned, i_passed); 8480 8481 autorun_devices(part); 8482 } 8483 8484 #endif /* !MODULE */ 8485 8486 static __exit void md_exit(void) 8487 { 8488 struct mddev *mddev; 8489 struct list_head *tmp; 8490 int delay = 1; 8491 8492 blk_unregister_region(MKDEV(MD_MAJOR,0), 512); 8493 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); 8494 8495 unregister_blkdev(MD_MAJOR,"md"); 8496 unregister_blkdev(mdp_major, "mdp"); 8497 unregister_reboot_notifier(&md_notifier); 8498 unregister_sysctl_table(raid_table_header); 8499 8500 /* We cannot unload the modules while some process is 8501 * waiting for us in select() or poll() - wake them up 8502 */ 8503 md_unloading = 1; 8504 while (waitqueue_active(&md_event_waiters)) { 8505 /* not safe to leave yet */ 8506 wake_up(&md_event_waiters); 8507 msleep(delay); 8508 delay += delay; 8509 } 8510 remove_proc_entry("mdstat", NULL); 8511 8512 for_each_mddev(mddev, tmp) { 8513 export_array(mddev); 8514 mddev->hold_active = 0; 8515 } 8516 destroy_workqueue(md_misc_wq); 8517 destroy_workqueue(md_wq); 8518 } 8519 8520 subsys_initcall(md_init); 8521 module_exit(md_exit) 8522 8523 static int get_ro(char *buffer, struct kernel_param *kp) 8524 { 8525 return sprintf(buffer, "%d", start_readonly); 8526 } 8527 static int set_ro(const char *val, struct kernel_param *kp) 8528 { 8529 char *e; 8530 int num = simple_strtoul(val, &e, 10); 8531 if (*val && (*e == '\0' || *e == '\n')) { 8532 start_readonly = num; 8533 return 0; 8534 } 8535 return -EINVAL; 8536 } 8537 8538 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); 8539 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); 8540 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); 8541 8542 MODULE_LICENSE("GPL"); 8543 MODULE_DESCRIPTION("MD RAID framework"); 8544 MODULE_ALIAS("md"); 8545 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 8546