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 Errors, Warnings, etc. 35 Please use: 36 pr_crit() for error conditions that risk data loss 37 pr_err() for error conditions that are unexpected, like an IO error 38 or internal inconsistency 39 pr_warn() for error conditions that could have been predicated, like 40 adding a device to an array when it has incompatible metadata 41 pr_info() for every interesting, very rare events, like an array starting 42 or stopping, or resync starting or stopping 43 pr_debug() for everything else. 44 45 */ 46 47 #include <linux/sched/signal.h> 48 #include <linux/kthread.h> 49 #include <linux/blkdev.h> 50 #include <linux/badblocks.h> 51 #include <linux/sysctl.h> 52 #include <linux/seq_file.h> 53 #include <linux/fs.h> 54 #include <linux/poll.h> 55 #include <linux/ctype.h> 56 #include <linux/string.h> 57 #include <linux/hdreg.h> 58 #include <linux/proc_fs.h> 59 #include <linux/random.h> 60 #include <linux/module.h> 61 #include <linux/reboot.h> 62 #include <linux/file.h> 63 #include <linux/compat.h> 64 #include <linux/delay.h> 65 #include <linux/raid/md_p.h> 66 #include <linux/raid/md_u.h> 67 #include <linux/slab.h> 68 #include <trace/events/block.h> 69 #include "md.h" 70 #include "bitmap.h" 71 #include "md-cluster.h" 72 73 #ifndef MODULE 74 static void autostart_arrays(int part); 75 #endif 76 77 /* pers_list is a list of registered personalities protected 78 * by pers_lock. 79 * pers_lock does extra service to protect accesses to 80 * mddev->thread when the mutex cannot be held. 81 */ 82 static LIST_HEAD(pers_list); 83 static DEFINE_SPINLOCK(pers_lock); 84 85 struct md_cluster_operations *md_cluster_ops; 86 EXPORT_SYMBOL(md_cluster_ops); 87 struct module *md_cluster_mod; 88 EXPORT_SYMBOL(md_cluster_mod); 89 90 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 91 static struct workqueue_struct *md_wq; 92 static struct workqueue_struct *md_misc_wq; 93 94 static int remove_and_add_spares(struct mddev *mddev, 95 struct md_rdev *this); 96 static void mddev_detach(struct mddev *mddev); 97 98 /* 99 * Default number of read corrections we'll attempt on an rdev 100 * before ejecting it from the array. We divide the read error 101 * count by 2 for every hour elapsed between read errors. 102 */ 103 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 104 /* 105 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 106 * is 1000 KB/sec, so the extra system load does not show up that much. 107 * Increase it if you want to have more _guaranteed_ speed. Note that 108 * the RAID driver will use the maximum available bandwidth if the IO 109 * subsystem is idle. There is also an 'absolute maximum' reconstruction 110 * speed limit - in case reconstruction slows down your system despite 111 * idle IO detection. 112 * 113 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 114 * or /sys/block/mdX/md/sync_speed_{min,max} 115 */ 116 117 static int sysctl_speed_limit_min = 1000; 118 static int sysctl_speed_limit_max = 200000; 119 static inline int speed_min(struct mddev *mddev) 120 { 121 return mddev->sync_speed_min ? 122 mddev->sync_speed_min : sysctl_speed_limit_min; 123 } 124 125 static inline int speed_max(struct mddev *mddev) 126 { 127 return mddev->sync_speed_max ? 128 mddev->sync_speed_max : sysctl_speed_limit_max; 129 } 130 131 static struct ctl_table_header *raid_table_header; 132 133 static struct ctl_table raid_table[] = { 134 { 135 .procname = "speed_limit_min", 136 .data = &sysctl_speed_limit_min, 137 .maxlen = sizeof(int), 138 .mode = S_IRUGO|S_IWUSR, 139 .proc_handler = proc_dointvec, 140 }, 141 { 142 .procname = "speed_limit_max", 143 .data = &sysctl_speed_limit_max, 144 .maxlen = sizeof(int), 145 .mode = S_IRUGO|S_IWUSR, 146 .proc_handler = proc_dointvec, 147 }, 148 { } 149 }; 150 151 static struct ctl_table raid_dir_table[] = { 152 { 153 .procname = "raid", 154 .maxlen = 0, 155 .mode = S_IRUGO|S_IXUGO, 156 .child = raid_table, 157 }, 158 { } 159 }; 160 161 static struct ctl_table raid_root_table[] = { 162 { 163 .procname = "dev", 164 .maxlen = 0, 165 .mode = 0555, 166 .child = raid_dir_table, 167 }, 168 { } 169 }; 170 171 static const struct block_device_operations md_fops; 172 173 static int start_readonly; 174 175 /* bio_clone_mddev 176 * like bio_clone, but with a local bio set 177 */ 178 179 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, 180 struct mddev *mddev) 181 { 182 struct bio *b; 183 184 if (!mddev || !mddev->bio_set) 185 return bio_alloc(gfp_mask, nr_iovecs); 186 187 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); 188 if (!b) 189 return NULL; 190 return b; 191 } 192 EXPORT_SYMBOL_GPL(bio_alloc_mddev); 193 194 /* 195 * We have a system wide 'event count' that is incremented 196 * on any 'interesting' event, and readers of /proc/mdstat 197 * can use 'poll' or 'select' to find out when the event 198 * count increases. 199 * 200 * Events are: 201 * start array, stop array, error, add device, remove device, 202 * start build, activate spare 203 */ 204 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); 205 static atomic_t md_event_count; 206 void md_new_event(struct mddev *mddev) 207 { 208 atomic_inc(&md_event_count); 209 wake_up(&md_event_waiters); 210 } 211 EXPORT_SYMBOL_GPL(md_new_event); 212 213 /* 214 * Enables to iterate over all existing md arrays 215 * all_mddevs_lock protects this list. 216 */ 217 static LIST_HEAD(all_mddevs); 218 static DEFINE_SPINLOCK(all_mddevs_lock); 219 220 /* 221 * iterates through all used mddevs in the system. 222 * We take care to grab the all_mddevs_lock whenever navigating 223 * the list, and to always hold a refcount when unlocked. 224 * Any code which breaks out of this loop while own 225 * a reference to the current mddev and must mddev_put it. 226 */ 227 #define for_each_mddev(_mddev,_tmp) \ 228 \ 229 for (({ spin_lock(&all_mddevs_lock); \ 230 _tmp = all_mddevs.next; \ 231 _mddev = NULL;}); \ 232 ({ if (_tmp != &all_mddevs) \ 233 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ 234 spin_unlock(&all_mddevs_lock); \ 235 if (_mddev) mddev_put(_mddev); \ 236 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ 237 _tmp != &all_mddevs;}); \ 238 ({ spin_lock(&all_mddevs_lock); \ 239 _tmp = _tmp->next;}) \ 240 ) 241 242 /* Rather than calling directly into the personality make_request function, 243 * IO requests come here first so that we can check if the device is 244 * being suspended pending a reconfiguration. 245 * We hold a refcount over the call to ->make_request. By the time that 246 * call has finished, the bio has been linked into some internal structure 247 * and so is visible to ->quiesce(), so we don't need the refcount any more. 248 */ 249 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) 250 { 251 const int rw = bio_data_dir(bio); 252 struct mddev *mddev = q->queuedata; 253 unsigned int sectors; 254 int cpu; 255 256 blk_queue_split(q, &bio, q->bio_split); 257 258 if (mddev == NULL || mddev->pers == NULL) { 259 bio_io_error(bio); 260 return BLK_QC_T_NONE; 261 } 262 if (mddev->ro == 1 && unlikely(rw == WRITE)) { 263 if (bio_sectors(bio) != 0) 264 bio->bi_error = -EROFS; 265 bio_endio(bio); 266 return BLK_QC_T_NONE; 267 } 268 smp_rmb(); /* Ensure implications of 'active' are visible */ 269 rcu_read_lock(); 270 if (mddev->suspended) { 271 DEFINE_WAIT(__wait); 272 for (;;) { 273 prepare_to_wait(&mddev->sb_wait, &__wait, 274 TASK_UNINTERRUPTIBLE); 275 if (!mddev->suspended) 276 break; 277 rcu_read_unlock(); 278 schedule(); 279 rcu_read_lock(); 280 } 281 finish_wait(&mddev->sb_wait, &__wait); 282 } 283 atomic_inc(&mddev->active_io); 284 rcu_read_unlock(); 285 286 /* 287 * save the sectors now since our bio can 288 * go away inside make_request 289 */ 290 sectors = bio_sectors(bio); 291 /* bio could be mergeable after passing to underlayer */ 292 bio->bi_opf &= ~REQ_NOMERGE; 293 mddev->pers->make_request(mddev, bio); 294 295 cpu = part_stat_lock(); 296 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); 297 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); 298 part_stat_unlock(); 299 300 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) 301 wake_up(&mddev->sb_wait); 302 303 return BLK_QC_T_NONE; 304 } 305 306 /* mddev_suspend makes sure no new requests are submitted 307 * to the device, and that any requests that have been submitted 308 * are completely handled. 309 * Once mddev_detach() is called and completes, the module will be 310 * completely unused. 311 */ 312 void mddev_suspend(struct mddev *mddev) 313 { 314 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk); 315 if (mddev->suspended++) 316 return; 317 synchronize_rcu(); 318 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); 319 mddev->pers->quiesce(mddev, 1); 320 321 del_timer_sync(&mddev->safemode_timer); 322 } 323 EXPORT_SYMBOL_GPL(mddev_suspend); 324 325 void mddev_resume(struct mddev *mddev) 326 { 327 if (--mddev->suspended) 328 return; 329 wake_up(&mddev->sb_wait); 330 mddev->pers->quiesce(mddev, 0); 331 332 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 333 md_wakeup_thread(mddev->thread); 334 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 335 } 336 EXPORT_SYMBOL_GPL(mddev_resume); 337 338 int mddev_congested(struct mddev *mddev, int bits) 339 { 340 struct md_personality *pers = mddev->pers; 341 int ret = 0; 342 343 rcu_read_lock(); 344 if (mddev->suspended) 345 ret = 1; 346 else if (pers && pers->congested) 347 ret = pers->congested(mddev, bits); 348 rcu_read_unlock(); 349 return ret; 350 } 351 EXPORT_SYMBOL_GPL(mddev_congested); 352 static int md_congested(void *data, int bits) 353 { 354 struct mddev *mddev = data; 355 return mddev_congested(mddev, bits); 356 } 357 358 /* 359 * Generic flush handling for md 360 */ 361 362 static void md_end_flush(struct bio *bio) 363 { 364 struct md_rdev *rdev = bio->bi_private; 365 struct mddev *mddev = rdev->mddev; 366 367 rdev_dec_pending(rdev, mddev); 368 369 if (atomic_dec_and_test(&mddev->flush_pending)) { 370 /* The pre-request flush has finished */ 371 queue_work(md_wq, &mddev->flush_work); 372 } 373 bio_put(bio); 374 } 375 376 static void md_submit_flush_data(struct work_struct *ws); 377 378 static void submit_flushes(struct work_struct *ws) 379 { 380 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 381 struct md_rdev *rdev; 382 383 INIT_WORK(&mddev->flush_work, md_submit_flush_data); 384 atomic_set(&mddev->flush_pending, 1); 385 rcu_read_lock(); 386 rdev_for_each_rcu(rdev, mddev) 387 if (rdev->raid_disk >= 0 && 388 !test_bit(Faulty, &rdev->flags)) { 389 /* Take two references, one is dropped 390 * when request finishes, one after 391 * we reclaim rcu_read_lock 392 */ 393 struct bio *bi; 394 atomic_inc(&rdev->nr_pending); 395 atomic_inc(&rdev->nr_pending); 396 rcu_read_unlock(); 397 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); 398 bi->bi_end_io = md_end_flush; 399 bi->bi_private = rdev; 400 bi->bi_bdev = rdev->bdev; 401 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; 402 atomic_inc(&mddev->flush_pending); 403 submit_bio(bi); 404 rcu_read_lock(); 405 rdev_dec_pending(rdev, mddev); 406 } 407 rcu_read_unlock(); 408 if (atomic_dec_and_test(&mddev->flush_pending)) 409 queue_work(md_wq, &mddev->flush_work); 410 } 411 412 static void md_submit_flush_data(struct work_struct *ws) 413 { 414 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 415 struct bio *bio = mddev->flush_bio; 416 417 if (bio->bi_iter.bi_size == 0) 418 /* an empty barrier - all done */ 419 bio_endio(bio); 420 else { 421 bio->bi_opf &= ~REQ_PREFLUSH; 422 mddev->pers->make_request(mddev, bio); 423 } 424 425 mddev->flush_bio = NULL; 426 wake_up(&mddev->sb_wait); 427 } 428 429 void md_flush_request(struct mddev *mddev, struct bio *bio) 430 { 431 spin_lock_irq(&mddev->lock); 432 wait_event_lock_irq(mddev->sb_wait, 433 !mddev->flush_bio, 434 mddev->lock); 435 mddev->flush_bio = bio; 436 spin_unlock_irq(&mddev->lock); 437 438 INIT_WORK(&mddev->flush_work, submit_flushes); 439 queue_work(md_wq, &mddev->flush_work); 440 } 441 EXPORT_SYMBOL(md_flush_request); 442 443 void md_unplug(struct blk_plug_cb *cb, bool from_schedule) 444 { 445 struct mddev *mddev = cb->data; 446 md_wakeup_thread(mddev->thread); 447 kfree(cb); 448 } 449 EXPORT_SYMBOL(md_unplug); 450 451 static inline struct mddev *mddev_get(struct mddev *mddev) 452 { 453 atomic_inc(&mddev->active); 454 return mddev; 455 } 456 457 static void mddev_delayed_delete(struct work_struct *ws); 458 459 static void mddev_put(struct mddev *mddev) 460 { 461 struct bio_set *bs = NULL; 462 463 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 464 return; 465 if (!mddev->raid_disks && list_empty(&mddev->disks) && 466 mddev->ctime == 0 && !mddev->hold_active) { 467 /* Array is not configured at all, and not held active, 468 * so destroy it */ 469 list_del_init(&mddev->all_mddevs); 470 bs = mddev->bio_set; 471 mddev->bio_set = NULL; 472 if (mddev->gendisk) { 473 /* We did a probe so need to clean up. Call 474 * queue_work inside the spinlock so that 475 * flush_workqueue() after mddev_find will 476 * succeed in waiting for the work to be done. 477 */ 478 INIT_WORK(&mddev->del_work, mddev_delayed_delete); 479 queue_work(md_misc_wq, &mddev->del_work); 480 } else 481 kfree(mddev); 482 } 483 spin_unlock(&all_mddevs_lock); 484 if (bs) 485 bioset_free(bs); 486 } 487 488 static void md_safemode_timeout(unsigned long data); 489 490 void mddev_init(struct mddev *mddev) 491 { 492 mutex_init(&mddev->open_mutex); 493 mutex_init(&mddev->reconfig_mutex); 494 mutex_init(&mddev->bitmap_info.mutex); 495 INIT_LIST_HEAD(&mddev->disks); 496 INIT_LIST_HEAD(&mddev->all_mddevs); 497 setup_timer(&mddev->safemode_timer, md_safemode_timeout, 498 (unsigned long) mddev); 499 atomic_set(&mddev->active, 1); 500 atomic_set(&mddev->openers, 0); 501 atomic_set(&mddev->active_io, 0); 502 spin_lock_init(&mddev->lock); 503 atomic_set(&mddev->flush_pending, 0); 504 init_waitqueue_head(&mddev->sb_wait); 505 init_waitqueue_head(&mddev->recovery_wait); 506 mddev->reshape_position = MaxSector; 507 mddev->reshape_backwards = 0; 508 mddev->last_sync_action = "none"; 509 mddev->resync_min = 0; 510 mddev->resync_max = MaxSector; 511 mddev->level = LEVEL_NONE; 512 } 513 EXPORT_SYMBOL_GPL(mddev_init); 514 515 static struct mddev *mddev_find(dev_t unit) 516 { 517 struct mddev *mddev, *new = NULL; 518 519 if (unit && MAJOR(unit) != MD_MAJOR) 520 unit &= ~((1<<MdpMinorShift)-1); 521 522 retry: 523 spin_lock(&all_mddevs_lock); 524 525 if (unit) { 526 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 527 if (mddev->unit == unit) { 528 mddev_get(mddev); 529 spin_unlock(&all_mddevs_lock); 530 kfree(new); 531 return mddev; 532 } 533 534 if (new) { 535 list_add(&new->all_mddevs, &all_mddevs); 536 spin_unlock(&all_mddevs_lock); 537 new->hold_active = UNTIL_IOCTL; 538 return new; 539 } 540 } else if (new) { 541 /* find an unused unit number */ 542 static int next_minor = 512; 543 int start = next_minor; 544 int is_free = 0; 545 int dev = 0; 546 while (!is_free) { 547 dev = MKDEV(MD_MAJOR, next_minor); 548 next_minor++; 549 if (next_minor > MINORMASK) 550 next_minor = 0; 551 if (next_minor == start) { 552 /* Oh dear, all in use. */ 553 spin_unlock(&all_mddevs_lock); 554 kfree(new); 555 return NULL; 556 } 557 558 is_free = 1; 559 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 560 if (mddev->unit == dev) { 561 is_free = 0; 562 break; 563 } 564 } 565 new->unit = dev; 566 new->md_minor = MINOR(dev); 567 new->hold_active = UNTIL_STOP; 568 list_add(&new->all_mddevs, &all_mddevs); 569 spin_unlock(&all_mddevs_lock); 570 return new; 571 } 572 spin_unlock(&all_mddevs_lock); 573 574 new = kzalloc(sizeof(*new), GFP_KERNEL); 575 if (!new) 576 return NULL; 577 578 new->unit = unit; 579 if (MAJOR(unit) == MD_MAJOR) 580 new->md_minor = MINOR(unit); 581 else 582 new->md_minor = MINOR(unit) >> MdpMinorShift; 583 584 mddev_init(new); 585 586 goto retry; 587 } 588 589 static struct attribute_group md_redundancy_group; 590 591 void mddev_unlock(struct mddev *mddev) 592 { 593 if (mddev->to_remove) { 594 /* These cannot be removed under reconfig_mutex as 595 * an access to the files will try to take reconfig_mutex 596 * while holding the file unremovable, which leads to 597 * a deadlock. 598 * So hold set sysfs_active while the remove in happeing, 599 * and anything else which might set ->to_remove or my 600 * otherwise change the sysfs namespace will fail with 601 * -EBUSY if sysfs_active is still set. 602 * We set sysfs_active under reconfig_mutex and elsewhere 603 * test it under the same mutex to ensure its correct value 604 * is seen. 605 */ 606 struct attribute_group *to_remove = mddev->to_remove; 607 mddev->to_remove = NULL; 608 mddev->sysfs_active = 1; 609 mutex_unlock(&mddev->reconfig_mutex); 610 611 if (mddev->kobj.sd) { 612 if (to_remove != &md_redundancy_group) 613 sysfs_remove_group(&mddev->kobj, to_remove); 614 if (mddev->pers == NULL || 615 mddev->pers->sync_request == NULL) { 616 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 617 if (mddev->sysfs_action) 618 sysfs_put(mddev->sysfs_action); 619 mddev->sysfs_action = NULL; 620 } 621 } 622 mddev->sysfs_active = 0; 623 } else 624 mutex_unlock(&mddev->reconfig_mutex); 625 626 /* As we've dropped the mutex we need a spinlock to 627 * make sure the thread doesn't disappear 628 */ 629 spin_lock(&pers_lock); 630 md_wakeup_thread(mddev->thread); 631 spin_unlock(&pers_lock); 632 } 633 EXPORT_SYMBOL_GPL(mddev_unlock); 634 635 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) 636 { 637 struct md_rdev *rdev; 638 639 rdev_for_each_rcu(rdev, mddev) 640 if (rdev->desc_nr == nr) 641 return rdev; 642 643 return NULL; 644 } 645 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); 646 647 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) 648 { 649 struct md_rdev *rdev; 650 651 rdev_for_each(rdev, mddev) 652 if (rdev->bdev->bd_dev == dev) 653 return rdev; 654 655 return NULL; 656 } 657 658 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) 659 { 660 struct md_rdev *rdev; 661 662 rdev_for_each_rcu(rdev, mddev) 663 if (rdev->bdev->bd_dev == dev) 664 return rdev; 665 666 return NULL; 667 } 668 669 static struct md_personality *find_pers(int level, char *clevel) 670 { 671 struct md_personality *pers; 672 list_for_each_entry(pers, &pers_list, list) { 673 if (level != LEVEL_NONE && pers->level == level) 674 return pers; 675 if (strcmp(pers->name, clevel)==0) 676 return pers; 677 } 678 return NULL; 679 } 680 681 /* return the offset of the super block in 512byte sectors */ 682 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) 683 { 684 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; 685 return MD_NEW_SIZE_SECTORS(num_sectors); 686 } 687 688 static int alloc_disk_sb(struct md_rdev *rdev) 689 { 690 rdev->sb_page = alloc_page(GFP_KERNEL); 691 if (!rdev->sb_page) 692 return -ENOMEM; 693 return 0; 694 } 695 696 void md_rdev_clear(struct md_rdev *rdev) 697 { 698 if (rdev->sb_page) { 699 put_page(rdev->sb_page); 700 rdev->sb_loaded = 0; 701 rdev->sb_page = NULL; 702 rdev->sb_start = 0; 703 rdev->sectors = 0; 704 } 705 if (rdev->bb_page) { 706 put_page(rdev->bb_page); 707 rdev->bb_page = NULL; 708 } 709 badblocks_exit(&rdev->badblocks); 710 } 711 EXPORT_SYMBOL_GPL(md_rdev_clear); 712 713 static void super_written(struct bio *bio) 714 { 715 struct md_rdev *rdev = bio->bi_private; 716 struct mddev *mddev = rdev->mddev; 717 718 if (bio->bi_error) { 719 pr_err("md: super_written gets error=%d\n", bio->bi_error); 720 md_error(mddev, rdev); 721 if (!test_bit(Faulty, &rdev->flags) 722 && (bio->bi_opf & MD_FAILFAST)) { 723 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags); 724 set_bit(LastDev, &rdev->flags); 725 } 726 } else 727 clear_bit(LastDev, &rdev->flags); 728 729 if (atomic_dec_and_test(&mddev->pending_writes)) 730 wake_up(&mddev->sb_wait); 731 rdev_dec_pending(rdev, mddev); 732 bio_put(bio); 733 } 734 735 void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 736 sector_t sector, int size, struct page *page) 737 { 738 /* write first size bytes of page to sector of rdev 739 * Increment mddev->pending_writes before returning 740 * and decrement it on completion, waking up sb_wait 741 * if zero is reached. 742 * If an error occurred, call md_error 743 */ 744 struct bio *bio; 745 int ff = 0; 746 747 if (test_bit(Faulty, &rdev->flags)) 748 return; 749 750 bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); 751 752 atomic_inc(&rdev->nr_pending); 753 754 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; 755 bio->bi_iter.bi_sector = sector; 756 bio_add_page(bio, page, size, 0); 757 bio->bi_private = rdev; 758 bio->bi_end_io = super_written; 759 760 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) && 761 test_bit(FailFast, &rdev->flags) && 762 !test_bit(LastDev, &rdev->flags)) 763 ff = MD_FAILFAST; 764 bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_FUA | ff; 765 766 atomic_inc(&mddev->pending_writes); 767 submit_bio(bio); 768 } 769 770 int md_super_wait(struct mddev *mddev) 771 { 772 /* wait for all superblock writes that were scheduled to complete */ 773 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); 774 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags)) 775 return -EAGAIN; 776 return 0; 777 } 778 779 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 780 struct page *page, int op, int op_flags, bool metadata_op) 781 { 782 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); 783 int ret; 784 785 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? 786 rdev->meta_bdev : rdev->bdev; 787 bio_set_op_attrs(bio, op, op_flags); 788 if (metadata_op) 789 bio->bi_iter.bi_sector = sector + rdev->sb_start; 790 else if (rdev->mddev->reshape_position != MaxSector && 791 (rdev->mddev->reshape_backwards == 792 (sector >= rdev->mddev->reshape_position))) 793 bio->bi_iter.bi_sector = sector + rdev->new_data_offset; 794 else 795 bio->bi_iter.bi_sector = sector + rdev->data_offset; 796 bio_add_page(bio, page, size, 0); 797 798 submit_bio_wait(bio); 799 800 ret = !bio->bi_error; 801 bio_put(bio); 802 return ret; 803 } 804 EXPORT_SYMBOL_GPL(sync_page_io); 805 806 static int read_disk_sb(struct md_rdev *rdev, int size) 807 { 808 char b[BDEVNAME_SIZE]; 809 810 if (rdev->sb_loaded) 811 return 0; 812 813 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) 814 goto fail; 815 rdev->sb_loaded = 1; 816 return 0; 817 818 fail: 819 pr_err("md: disabled device %s, could not read superblock.\n", 820 bdevname(rdev->bdev,b)); 821 return -EINVAL; 822 } 823 824 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 825 { 826 return sb1->set_uuid0 == sb2->set_uuid0 && 827 sb1->set_uuid1 == sb2->set_uuid1 && 828 sb1->set_uuid2 == sb2->set_uuid2 && 829 sb1->set_uuid3 == sb2->set_uuid3; 830 } 831 832 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 833 { 834 int ret; 835 mdp_super_t *tmp1, *tmp2; 836 837 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 838 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 839 840 if (!tmp1 || !tmp2) { 841 ret = 0; 842 goto abort; 843 } 844 845 *tmp1 = *sb1; 846 *tmp2 = *sb2; 847 848 /* 849 * nr_disks is not constant 850 */ 851 tmp1->nr_disks = 0; 852 tmp2->nr_disks = 0; 853 854 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); 855 abort: 856 kfree(tmp1); 857 kfree(tmp2); 858 return ret; 859 } 860 861 static u32 md_csum_fold(u32 csum) 862 { 863 csum = (csum & 0xffff) + (csum >> 16); 864 return (csum & 0xffff) + (csum >> 16); 865 } 866 867 static unsigned int calc_sb_csum(mdp_super_t *sb) 868 { 869 u64 newcsum = 0; 870 u32 *sb32 = (u32*)sb; 871 int i; 872 unsigned int disk_csum, csum; 873 874 disk_csum = sb->sb_csum; 875 sb->sb_csum = 0; 876 877 for (i = 0; i < MD_SB_BYTES/4 ; i++) 878 newcsum += sb32[i]; 879 csum = (newcsum & 0xffffffff) + (newcsum>>32); 880 881 #ifdef CONFIG_ALPHA 882 /* This used to use csum_partial, which was wrong for several 883 * reasons including that different results are returned on 884 * different architectures. It isn't critical that we get exactly 885 * the same return value as before (we always csum_fold before 886 * testing, and that removes any differences). However as we 887 * know that csum_partial always returned a 16bit value on 888 * alphas, do a fold to maximise conformity to previous behaviour. 889 */ 890 sb->sb_csum = md_csum_fold(disk_csum); 891 #else 892 sb->sb_csum = disk_csum; 893 #endif 894 return csum; 895 } 896 897 /* 898 * Handle superblock details. 899 * We want to be able to handle multiple superblock formats 900 * so we have a common interface to them all, and an array of 901 * different handlers. 902 * We rely on user-space to write the initial superblock, and support 903 * reading and updating of superblocks. 904 * Interface methods are: 905 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) 906 * loads and validates a superblock on dev. 907 * if refdev != NULL, compare superblocks on both devices 908 * Return: 909 * 0 - dev has a superblock that is compatible with refdev 910 * 1 - dev has a superblock that is compatible and newer than refdev 911 * so dev should be used as the refdev in future 912 * -EINVAL superblock incompatible or invalid 913 * -othererror e.g. -EIO 914 * 915 * int validate_super(struct mddev *mddev, struct md_rdev *dev) 916 * Verify that dev is acceptable into mddev. 917 * The first time, mddev->raid_disks will be 0, and data from 918 * dev should be merged in. Subsequent calls check that dev 919 * is new enough. Return 0 or -EINVAL 920 * 921 * void sync_super(struct mddev *mddev, struct md_rdev *dev) 922 * Update the superblock for rdev with data in mddev 923 * This does not write to disc. 924 * 925 */ 926 927 struct super_type { 928 char *name; 929 struct module *owner; 930 int (*load_super)(struct md_rdev *rdev, 931 struct md_rdev *refdev, 932 int minor_version); 933 int (*validate_super)(struct mddev *mddev, 934 struct md_rdev *rdev); 935 void (*sync_super)(struct mddev *mddev, 936 struct md_rdev *rdev); 937 unsigned long long (*rdev_size_change)(struct md_rdev *rdev, 938 sector_t num_sectors); 939 int (*allow_new_offset)(struct md_rdev *rdev, 940 unsigned long long new_offset); 941 }; 942 943 /* 944 * Check that the given mddev has no bitmap. 945 * 946 * This function is called from the run method of all personalities that do not 947 * support bitmaps. It prints an error message and returns non-zero if mddev 948 * has a bitmap. Otherwise, it returns 0. 949 * 950 */ 951 int md_check_no_bitmap(struct mddev *mddev) 952 { 953 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) 954 return 0; 955 pr_warn("%s: bitmaps are not supported for %s\n", 956 mdname(mddev), mddev->pers->name); 957 return 1; 958 } 959 EXPORT_SYMBOL(md_check_no_bitmap); 960 961 /* 962 * load_super for 0.90.0 963 */ 964 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 965 { 966 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 967 mdp_super_t *sb; 968 int ret; 969 970 /* 971 * Calculate the position of the superblock (512byte sectors), 972 * it's at the end of the disk. 973 * 974 * It also happens to be a multiple of 4Kb. 975 */ 976 rdev->sb_start = calc_dev_sboffset(rdev); 977 978 ret = read_disk_sb(rdev, MD_SB_BYTES); 979 if (ret) 980 return ret; 981 982 ret = -EINVAL; 983 984 bdevname(rdev->bdev, b); 985 sb = page_address(rdev->sb_page); 986 987 if (sb->md_magic != MD_SB_MAGIC) { 988 pr_warn("md: invalid raid superblock magic on %s\n", b); 989 goto abort; 990 } 991 992 if (sb->major_version != 0 || 993 sb->minor_version < 90 || 994 sb->minor_version > 91) { 995 pr_warn("Bad version number %d.%d on %s\n", 996 sb->major_version, sb->minor_version, b); 997 goto abort; 998 } 999 1000 if (sb->raid_disks <= 0) 1001 goto abort; 1002 1003 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { 1004 pr_warn("md: invalid superblock checksum on %s\n", b); 1005 goto abort; 1006 } 1007 1008 rdev->preferred_minor = sb->md_minor; 1009 rdev->data_offset = 0; 1010 rdev->new_data_offset = 0; 1011 rdev->sb_size = MD_SB_BYTES; 1012 rdev->badblocks.shift = -1; 1013 1014 if (sb->level == LEVEL_MULTIPATH) 1015 rdev->desc_nr = -1; 1016 else 1017 rdev->desc_nr = sb->this_disk.number; 1018 1019 if (!refdev) { 1020 ret = 1; 1021 } else { 1022 __u64 ev1, ev2; 1023 mdp_super_t *refsb = page_address(refdev->sb_page); 1024 if (!uuid_equal(refsb, sb)) { 1025 pr_warn("md: %s has different UUID to %s\n", 1026 b, bdevname(refdev->bdev,b2)); 1027 goto abort; 1028 } 1029 if (!sb_equal(refsb, sb)) { 1030 pr_warn("md: %s has same UUID but different superblock to %s\n", 1031 b, bdevname(refdev->bdev, b2)); 1032 goto abort; 1033 } 1034 ev1 = md_event(sb); 1035 ev2 = md_event(refsb); 1036 if (ev1 > ev2) 1037 ret = 1; 1038 else 1039 ret = 0; 1040 } 1041 rdev->sectors = rdev->sb_start; 1042 /* Limit to 4TB as metadata cannot record more than that. 1043 * (not needed for Linear and RAID0 as metadata doesn't 1044 * record this size) 1045 */ 1046 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) && 1047 sb->level >= 1) 1048 rdev->sectors = (sector_t)(2ULL << 32) - 2; 1049 1050 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) 1051 /* "this cannot possibly happen" ... */ 1052 ret = -EINVAL; 1053 1054 abort: 1055 return ret; 1056 } 1057 1058 /* 1059 * validate_super for 0.90.0 1060 */ 1061 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) 1062 { 1063 mdp_disk_t *desc; 1064 mdp_super_t *sb = page_address(rdev->sb_page); 1065 __u64 ev1 = md_event(sb); 1066 1067 rdev->raid_disk = -1; 1068 clear_bit(Faulty, &rdev->flags); 1069 clear_bit(In_sync, &rdev->flags); 1070 clear_bit(Bitmap_sync, &rdev->flags); 1071 clear_bit(WriteMostly, &rdev->flags); 1072 1073 if (mddev->raid_disks == 0) { 1074 mddev->major_version = 0; 1075 mddev->minor_version = sb->minor_version; 1076 mddev->patch_version = sb->patch_version; 1077 mddev->external = 0; 1078 mddev->chunk_sectors = sb->chunk_size >> 9; 1079 mddev->ctime = sb->ctime; 1080 mddev->utime = sb->utime; 1081 mddev->level = sb->level; 1082 mddev->clevel[0] = 0; 1083 mddev->layout = sb->layout; 1084 mddev->raid_disks = sb->raid_disks; 1085 mddev->dev_sectors = ((sector_t)sb->size) * 2; 1086 mddev->events = ev1; 1087 mddev->bitmap_info.offset = 0; 1088 mddev->bitmap_info.space = 0; 1089 /* bitmap can use 60 K after the 4K superblocks */ 1090 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 1091 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); 1092 mddev->reshape_backwards = 0; 1093 1094 if (mddev->minor_version >= 91) { 1095 mddev->reshape_position = sb->reshape_position; 1096 mddev->delta_disks = sb->delta_disks; 1097 mddev->new_level = sb->new_level; 1098 mddev->new_layout = sb->new_layout; 1099 mddev->new_chunk_sectors = sb->new_chunk >> 9; 1100 if (mddev->delta_disks < 0) 1101 mddev->reshape_backwards = 1; 1102 } else { 1103 mddev->reshape_position = MaxSector; 1104 mddev->delta_disks = 0; 1105 mddev->new_level = mddev->level; 1106 mddev->new_layout = mddev->layout; 1107 mddev->new_chunk_sectors = mddev->chunk_sectors; 1108 } 1109 1110 if (sb->state & (1<<MD_SB_CLEAN)) 1111 mddev->recovery_cp = MaxSector; 1112 else { 1113 if (sb->events_hi == sb->cp_events_hi && 1114 sb->events_lo == sb->cp_events_lo) { 1115 mddev->recovery_cp = sb->recovery_cp; 1116 } else 1117 mddev->recovery_cp = 0; 1118 } 1119 1120 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 1121 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 1122 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 1123 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 1124 1125 mddev->max_disks = MD_SB_DISKS; 1126 1127 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 1128 mddev->bitmap_info.file == NULL) { 1129 mddev->bitmap_info.offset = 1130 mddev->bitmap_info.default_offset; 1131 mddev->bitmap_info.space = 1132 mddev->bitmap_info.default_space; 1133 } 1134 1135 } else if (mddev->pers == NULL) { 1136 /* Insist on good event counter while assembling, except 1137 * for spares (which don't need an event count) */ 1138 ++ev1; 1139 if (sb->disks[rdev->desc_nr].state & ( 1140 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) 1141 if (ev1 < mddev->events) 1142 return -EINVAL; 1143 } else if (mddev->bitmap) { 1144 /* if adding to array with a bitmap, then we can accept an 1145 * older device ... but not too old. 1146 */ 1147 if (ev1 < mddev->bitmap->events_cleared) 1148 return 0; 1149 if (ev1 < mddev->events) 1150 set_bit(Bitmap_sync, &rdev->flags); 1151 } else { 1152 if (ev1 < mddev->events) 1153 /* just a hot-add of a new device, leave raid_disk at -1 */ 1154 return 0; 1155 } 1156 1157 if (mddev->level != LEVEL_MULTIPATH) { 1158 desc = sb->disks + rdev->desc_nr; 1159 1160 if (desc->state & (1<<MD_DISK_FAULTY)) 1161 set_bit(Faulty, &rdev->flags); 1162 else if (desc->state & (1<<MD_DISK_SYNC) /* && 1163 desc->raid_disk < mddev->raid_disks */) { 1164 set_bit(In_sync, &rdev->flags); 1165 rdev->raid_disk = desc->raid_disk; 1166 rdev->saved_raid_disk = desc->raid_disk; 1167 } else if (desc->state & (1<<MD_DISK_ACTIVE)) { 1168 /* active but not in sync implies recovery up to 1169 * reshape position. We don't know exactly where 1170 * that is, so set to zero for now */ 1171 if (mddev->minor_version >= 91) { 1172 rdev->recovery_offset = 0; 1173 rdev->raid_disk = desc->raid_disk; 1174 } 1175 } 1176 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 1177 set_bit(WriteMostly, &rdev->flags); 1178 if (desc->state & (1<<MD_DISK_FAILFAST)) 1179 set_bit(FailFast, &rdev->flags); 1180 } else /* MULTIPATH are always insync */ 1181 set_bit(In_sync, &rdev->flags); 1182 return 0; 1183 } 1184 1185 /* 1186 * sync_super for 0.90.0 1187 */ 1188 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) 1189 { 1190 mdp_super_t *sb; 1191 struct md_rdev *rdev2; 1192 int next_spare = mddev->raid_disks; 1193 1194 /* make rdev->sb match mddev data.. 1195 * 1196 * 1/ zero out disks 1197 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 1198 * 3/ any empty disks < next_spare become removed 1199 * 1200 * disks[0] gets initialised to REMOVED because 1201 * we cannot be sure from other fields if it has 1202 * been initialised or not. 1203 */ 1204 int i; 1205 int active=0, working=0,failed=0,spare=0,nr_disks=0; 1206 1207 rdev->sb_size = MD_SB_BYTES; 1208 1209 sb = page_address(rdev->sb_page); 1210 1211 memset(sb, 0, sizeof(*sb)); 1212 1213 sb->md_magic = MD_SB_MAGIC; 1214 sb->major_version = mddev->major_version; 1215 sb->patch_version = mddev->patch_version; 1216 sb->gvalid_words = 0; /* ignored */ 1217 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 1218 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 1219 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 1220 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 1221 1222 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); 1223 sb->level = mddev->level; 1224 sb->size = mddev->dev_sectors / 2; 1225 sb->raid_disks = mddev->raid_disks; 1226 sb->md_minor = mddev->md_minor; 1227 sb->not_persistent = 0; 1228 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); 1229 sb->state = 0; 1230 sb->events_hi = (mddev->events>>32); 1231 sb->events_lo = (u32)mddev->events; 1232 1233 if (mddev->reshape_position == MaxSector) 1234 sb->minor_version = 90; 1235 else { 1236 sb->minor_version = 91; 1237 sb->reshape_position = mddev->reshape_position; 1238 sb->new_level = mddev->new_level; 1239 sb->delta_disks = mddev->delta_disks; 1240 sb->new_layout = mddev->new_layout; 1241 sb->new_chunk = mddev->new_chunk_sectors << 9; 1242 } 1243 mddev->minor_version = sb->minor_version; 1244 if (mddev->in_sync) 1245 { 1246 sb->recovery_cp = mddev->recovery_cp; 1247 sb->cp_events_hi = (mddev->events>>32); 1248 sb->cp_events_lo = (u32)mddev->events; 1249 if (mddev->recovery_cp == MaxSector) 1250 sb->state = (1<< MD_SB_CLEAN); 1251 } else 1252 sb->recovery_cp = 0; 1253 1254 sb->layout = mddev->layout; 1255 sb->chunk_size = mddev->chunk_sectors << 9; 1256 1257 if (mddev->bitmap && mddev->bitmap_info.file == NULL) 1258 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 1259 1260 sb->disks[0].state = (1<<MD_DISK_REMOVED); 1261 rdev_for_each(rdev2, mddev) { 1262 mdp_disk_t *d; 1263 int desc_nr; 1264 int is_active = test_bit(In_sync, &rdev2->flags); 1265 1266 if (rdev2->raid_disk >= 0 && 1267 sb->minor_version >= 91) 1268 /* we have nowhere to store the recovery_offset, 1269 * but if it is not below the reshape_position, 1270 * we can piggy-back on that. 1271 */ 1272 is_active = 1; 1273 if (rdev2->raid_disk < 0 || 1274 test_bit(Faulty, &rdev2->flags)) 1275 is_active = 0; 1276 if (is_active) 1277 desc_nr = rdev2->raid_disk; 1278 else 1279 desc_nr = next_spare++; 1280 rdev2->desc_nr = desc_nr; 1281 d = &sb->disks[rdev2->desc_nr]; 1282 nr_disks++; 1283 d->number = rdev2->desc_nr; 1284 d->major = MAJOR(rdev2->bdev->bd_dev); 1285 d->minor = MINOR(rdev2->bdev->bd_dev); 1286 if (is_active) 1287 d->raid_disk = rdev2->raid_disk; 1288 else 1289 d->raid_disk = rdev2->desc_nr; /* compatibility */ 1290 if (test_bit(Faulty, &rdev2->flags)) 1291 d->state = (1<<MD_DISK_FAULTY); 1292 else if (is_active) { 1293 d->state = (1<<MD_DISK_ACTIVE); 1294 if (test_bit(In_sync, &rdev2->flags)) 1295 d->state |= (1<<MD_DISK_SYNC); 1296 active++; 1297 working++; 1298 } else { 1299 d->state = 0; 1300 spare++; 1301 working++; 1302 } 1303 if (test_bit(WriteMostly, &rdev2->flags)) 1304 d->state |= (1<<MD_DISK_WRITEMOSTLY); 1305 if (test_bit(FailFast, &rdev2->flags)) 1306 d->state |= (1<<MD_DISK_FAILFAST); 1307 } 1308 /* now set the "removed" and "faulty" bits on any missing devices */ 1309 for (i=0 ; i < mddev->raid_disks ; i++) { 1310 mdp_disk_t *d = &sb->disks[i]; 1311 if (d->state == 0 && d->number == 0) { 1312 d->number = i; 1313 d->raid_disk = i; 1314 d->state = (1<<MD_DISK_REMOVED); 1315 d->state |= (1<<MD_DISK_FAULTY); 1316 failed++; 1317 } 1318 } 1319 sb->nr_disks = nr_disks; 1320 sb->active_disks = active; 1321 sb->working_disks = working; 1322 sb->failed_disks = failed; 1323 sb->spare_disks = spare; 1324 1325 sb->this_disk = sb->disks[rdev->desc_nr]; 1326 sb->sb_csum = calc_sb_csum(sb); 1327 } 1328 1329 /* 1330 * rdev_size_change for 0.90.0 1331 */ 1332 static unsigned long long 1333 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1334 { 1335 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1336 return 0; /* component must fit device */ 1337 if (rdev->mddev->bitmap_info.offset) 1338 return 0; /* can't move bitmap */ 1339 rdev->sb_start = calc_dev_sboffset(rdev); 1340 if (!num_sectors || num_sectors > rdev->sb_start) 1341 num_sectors = rdev->sb_start; 1342 /* Limit to 4TB as metadata cannot record more than that. 1343 * 4TB == 2^32 KB, or 2*2^32 sectors. 1344 */ 1345 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) && 1346 rdev->mddev->level >= 1) 1347 num_sectors = (sector_t)(2ULL << 32) - 2; 1348 do { 1349 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1350 rdev->sb_page); 1351 } while (md_super_wait(rdev->mddev) < 0); 1352 return num_sectors; 1353 } 1354 1355 static int 1356 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) 1357 { 1358 /* non-zero offset changes not possible with v0.90 */ 1359 return new_offset == 0; 1360 } 1361 1362 /* 1363 * version 1 superblock 1364 */ 1365 1366 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) 1367 { 1368 __le32 disk_csum; 1369 u32 csum; 1370 unsigned long long newcsum; 1371 int size = 256 + le32_to_cpu(sb->max_dev)*2; 1372 __le32 *isuper = (__le32*)sb; 1373 1374 disk_csum = sb->sb_csum; 1375 sb->sb_csum = 0; 1376 newcsum = 0; 1377 for (; size >= 4; size -= 4) 1378 newcsum += le32_to_cpu(*isuper++); 1379 1380 if (size == 2) 1381 newcsum += le16_to_cpu(*(__le16*) isuper); 1382 1383 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 1384 sb->sb_csum = disk_csum; 1385 return cpu_to_le32(csum); 1386 } 1387 1388 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 1389 { 1390 struct mdp_superblock_1 *sb; 1391 int ret; 1392 sector_t sb_start; 1393 sector_t sectors; 1394 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1395 int bmask; 1396 1397 /* 1398 * Calculate the position of the superblock in 512byte sectors. 1399 * It is always aligned to a 4K boundary and 1400 * depeding on minor_version, it can be: 1401 * 0: At least 8K, but less than 12K, from end of device 1402 * 1: At start of device 1403 * 2: 4K from start of device. 1404 */ 1405 switch(minor_version) { 1406 case 0: 1407 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; 1408 sb_start -= 8*2; 1409 sb_start &= ~(sector_t)(4*2-1); 1410 break; 1411 case 1: 1412 sb_start = 0; 1413 break; 1414 case 2: 1415 sb_start = 8; 1416 break; 1417 default: 1418 return -EINVAL; 1419 } 1420 rdev->sb_start = sb_start; 1421 1422 /* superblock is rarely larger than 1K, but it can be larger, 1423 * and it is safe to read 4k, so we do that 1424 */ 1425 ret = read_disk_sb(rdev, 4096); 1426 if (ret) return ret; 1427 1428 sb = page_address(rdev->sb_page); 1429 1430 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 1431 sb->major_version != cpu_to_le32(1) || 1432 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 1433 le64_to_cpu(sb->super_offset) != rdev->sb_start || 1434 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 1435 return -EINVAL; 1436 1437 if (calc_sb_1_csum(sb) != sb->sb_csum) { 1438 pr_warn("md: invalid superblock checksum on %s\n", 1439 bdevname(rdev->bdev,b)); 1440 return -EINVAL; 1441 } 1442 if (le64_to_cpu(sb->data_size) < 10) { 1443 pr_warn("md: data_size too small on %s\n", 1444 bdevname(rdev->bdev,b)); 1445 return -EINVAL; 1446 } 1447 if (sb->pad0 || 1448 sb->pad3[0] || 1449 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) 1450 /* Some padding is non-zero, might be a new feature */ 1451 return -EINVAL; 1452 1453 rdev->preferred_minor = 0xffff; 1454 rdev->data_offset = le64_to_cpu(sb->data_offset); 1455 rdev->new_data_offset = rdev->data_offset; 1456 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && 1457 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) 1458 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); 1459 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); 1460 1461 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 1462 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1463 if (rdev->sb_size & bmask) 1464 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1465 1466 if (minor_version 1467 && rdev->data_offset < sb_start + (rdev->sb_size/512)) 1468 return -EINVAL; 1469 if (minor_version 1470 && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) 1471 return -EINVAL; 1472 1473 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) 1474 rdev->desc_nr = -1; 1475 else 1476 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1477 1478 if (!rdev->bb_page) { 1479 rdev->bb_page = alloc_page(GFP_KERNEL); 1480 if (!rdev->bb_page) 1481 return -ENOMEM; 1482 } 1483 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && 1484 rdev->badblocks.count == 0) { 1485 /* need to load the bad block list. 1486 * Currently we limit it to one page. 1487 */ 1488 s32 offset; 1489 sector_t bb_sector; 1490 u64 *bbp; 1491 int i; 1492 int sectors = le16_to_cpu(sb->bblog_size); 1493 if (sectors > (PAGE_SIZE / 512)) 1494 return -EINVAL; 1495 offset = le32_to_cpu(sb->bblog_offset); 1496 if (offset == 0) 1497 return -EINVAL; 1498 bb_sector = (long long)offset; 1499 if (!sync_page_io(rdev, bb_sector, sectors << 9, 1500 rdev->bb_page, REQ_OP_READ, 0, true)) 1501 return -EIO; 1502 bbp = (u64 *)page_address(rdev->bb_page); 1503 rdev->badblocks.shift = sb->bblog_shift; 1504 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { 1505 u64 bb = le64_to_cpu(*bbp); 1506 int count = bb & (0x3ff); 1507 u64 sector = bb >> 10; 1508 sector <<= sb->bblog_shift; 1509 count <<= sb->bblog_shift; 1510 if (bb + 1 == 0) 1511 break; 1512 if (badblocks_set(&rdev->badblocks, sector, count, 1)) 1513 return -EINVAL; 1514 } 1515 } else if (sb->bblog_offset != 0) 1516 rdev->badblocks.shift = 0; 1517 1518 if (!refdev) { 1519 ret = 1; 1520 } else { 1521 __u64 ev1, ev2; 1522 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); 1523 1524 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 1525 sb->level != refsb->level || 1526 sb->layout != refsb->layout || 1527 sb->chunksize != refsb->chunksize) { 1528 pr_warn("md: %s has strangely different superblock to %s\n", 1529 bdevname(rdev->bdev,b), 1530 bdevname(refdev->bdev,b2)); 1531 return -EINVAL; 1532 } 1533 ev1 = le64_to_cpu(sb->events); 1534 ev2 = le64_to_cpu(refsb->events); 1535 1536 if (ev1 > ev2) 1537 ret = 1; 1538 else 1539 ret = 0; 1540 } 1541 if (minor_version) { 1542 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); 1543 sectors -= rdev->data_offset; 1544 } else 1545 sectors = rdev->sb_start; 1546 if (sectors < le64_to_cpu(sb->data_size)) 1547 return -EINVAL; 1548 rdev->sectors = le64_to_cpu(sb->data_size); 1549 return ret; 1550 } 1551 1552 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) 1553 { 1554 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 1555 __u64 ev1 = le64_to_cpu(sb->events); 1556 1557 rdev->raid_disk = -1; 1558 clear_bit(Faulty, &rdev->flags); 1559 clear_bit(In_sync, &rdev->flags); 1560 clear_bit(Bitmap_sync, &rdev->flags); 1561 clear_bit(WriteMostly, &rdev->flags); 1562 1563 if (mddev->raid_disks == 0) { 1564 mddev->major_version = 1; 1565 mddev->patch_version = 0; 1566 mddev->external = 0; 1567 mddev->chunk_sectors = le32_to_cpu(sb->chunksize); 1568 mddev->ctime = le64_to_cpu(sb->ctime); 1569 mddev->utime = le64_to_cpu(sb->utime); 1570 mddev->level = le32_to_cpu(sb->level); 1571 mddev->clevel[0] = 0; 1572 mddev->layout = le32_to_cpu(sb->layout); 1573 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1574 mddev->dev_sectors = le64_to_cpu(sb->size); 1575 mddev->events = ev1; 1576 mddev->bitmap_info.offset = 0; 1577 mddev->bitmap_info.space = 0; 1578 /* Default location for bitmap is 1K after superblock 1579 * using 3K - total of 4K 1580 */ 1581 mddev->bitmap_info.default_offset = 1024 >> 9; 1582 mddev->bitmap_info.default_space = (4096-1024) >> 9; 1583 mddev->reshape_backwards = 0; 1584 1585 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1586 memcpy(mddev->uuid, sb->set_uuid, 16); 1587 1588 mddev->max_disks = (4096-256)/2; 1589 1590 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1591 mddev->bitmap_info.file == NULL) { 1592 mddev->bitmap_info.offset = 1593 (__s32)le32_to_cpu(sb->bitmap_offset); 1594 /* Metadata doesn't record how much space is available. 1595 * For 1.0, we assume we can use up to the superblock 1596 * if before, else to 4K beyond superblock. 1597 * For others, assume no change is possible. 1598 */ 1599 if (mddev->minor_version > 0) 1600 mddev->bitmap_info.space = 0; 1601 else if (mddev->bitmap_info.offset > 0) 1602 mddev->bitmap_info.space = 1603 8 - mddev->bitmap_info.offset; 1604 else 1605 mddev->bitmap_info.space = 1606 -mddev->bitmap_info.offset; 1607 } 1608 1609 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { 1610 mddev->reshape_position = le64_to_cpu(sb->reshape_position); 1611 mddev->delta_disks = le32_to_cpu(sb->delta_disks); 1612 mddev->new_level = le32_to_cpu(sb->new_level); 1613 mddev->new_layout = le32_to_cpu(sb->new_layout); 1614 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); 1615 if (mddev->delta_disks < 0 || 1616 (mddev->delta_disks == 0 && 1617 (le32_to_cpu(sb->feature_map) 1618 & MD_FEATURE_RESHAPE_BACKWARDS))) 1619 mddev->reshape_backwards = 1; 1620 } else { 1621 mddev->reshape_position = MaxSector; 1622 mddev->delta_disks = 0; 1623 mddev->new_level = mddev->level; 1624 mddev->new_layout = mddev->layout; 1625 mddev->new_chunk_sectors = mddev->chunk_sectors; 1626 } 1627 1628 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) 1629 set_bit(MD_HAS_JOURNAL, &mddev->flags); 1630 } else if (mddev->pers == NULL) { 1631 /* Insist of good event counter while assembling, except for 1632 * spares (which don't need an event count) */ 1633 ++ev1; 1634 if (rdev->desc_nr >= 0 && 1635 rdev->desc_nr < le32_to_cpu(sb->max_dev) && 1636 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || 1637 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) 1638 if (ev1 < mddev->events) 1639 return -EINVAL; 1640 } else if (mddev->bitmap) { 1641 /* If adding to array with a bitmap, then we can accept an 1642 * older device, but not too old. 1643 */ 1644 if (ev1 < mddev->bitmap->events_cleared) 1645 return 0; 1646 if (ev1 < mddev->events) 1647 set_bit(Bitmap_sync, &rdev->flags); 1648 } else { 1649 if (ev1 < mddev->events) 1650 /* just a hot-add of a new device, leave raid_disk at -1 */ 1651 return 0; 1652 } 1653 if (mddev->level != LEVEL_MULTIPATH) { 1654 int role; 1655 if (rdev->desc_nr < 0 || 1656 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { 1657 role = MD_DISK_ROLE_SPARE; 1658 rdev->desc_nr = -1; 1659 } else 1660 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1661 switch(role) { 1662 case MD_DISK_ROLE_SPARE: /* spare */ 1663 break; 1664 case MD_DISK_ROLE_FAULTY: /* faulty */ 1665 set_bit(Faulty, &rdev->flags); 1666 break; 1667 case MD_DISK_ROLE_JOURNAL: /* journal device */ 1668 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { 1669 /* journal device without journal feature */ 1670 pr_warn("md: journal device provided without journal feature, ignoring the device\n"); 1671 return -EINVAL; 1672 } 1673 set_bit(Journal, &rdev->flags); 1674 rdev->journal_tail = le64_to_cpu(sb->journal_tail); 1675 rdev->raid_disk = 0; 1676 break; 1677 default: 1678 rdev->saved_raid_disk = role; 1679 if ((le32_to_cpu(sb->feature_map) & 1680 MD_FEATURE_RECOVERY_OFFSET)) { 1681 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 1682 if (!(le32_to_cpu(sb->feature_map) & 1683 MD_FEATURE_RECOVERY_BITMAP)) 1684 rdev->saved_raid_disk = -1; 1685 } else 1686 set_bit(In_sync, &rdev->flags); 1687 rdev->raid_disk = role; 1688 break; 1689 } 1690 if (sb->devflags & WriteMostly1) 1691 set_bit(WriteMostly, &rdev->flags); 1692 if (sb->devflags & FailFast1) 1693 set_bit(FailFast, &rdev->flags); 1694 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) 1695 set_bit(Replacement, &rdev->flags); 1696 } else /* MULTIPATH are always insync */ 1697 set_bit(In_sync, &rdev->flags); 1698 1699 return 0; 1700 } 1701 1702 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) 1703 { 1704 struct mdp_superblock_1 *sb; 1705 struct md_rdev *rdev2; 1706 int max_dev, i; 1707 /* make rdev->sb match mddev and rdev data. */ 1708 1709 sb = page_address(rdev->sb_page); 1710 1711 sb->feature_map = 0; 1712 sb->pad0 = 0; 1713 sb->recovery_offset = cpu_to_le64(0); 1714 memset(sb->pad3, 0, sizeof(sb->pad3)); 1715 1716 sb->utime = cpu_to_le64((__u64)mddev->utime); 1717 sb->events = cpu_to_le64(mddev->events); 1718 if (mddev->in_sync) 1719 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1720 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) 1721 sb->resync_offset = cpu_to_le64(MaxSector); 1722 else 1723 sb->resync_offset = cpu_to_le64(0); 1724 1725 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); 1726 1727 sb->raid_disks = cpu_to_le32(mddev->raid_disks); 1728 sb->size = cpu_to_le64(mddev->dev_sectors); 1729 sb->chunksize = cpu_to_le32(mddev->chunk_sectors); 1730 sb->level = cpu_to_le32(mddev->level); 1731 sb->layout = cpu_to_le32(mddev->layout); 1732 if (test_bit(FailFast, &rdev->flags)) 1733 sb->devflags |= FailFast1; 1734 else 1735 sb->devflags &= ~FailFast1; 1736 1737 if (test_bit(WriteMostly, &rdev->flags)) 1738 sb->devflags |= WriteMostly1; 1739 else 1740 sb->devflags &= ~WriteMostly1; 1741 sb->data_offset = cpu_to_le64(rdev->data_offset); 1742 sb->data_size = cpu_to_le64(rdev->sectors); 1743 1744 if (mddev->bitmap && mddev->bitmap_info.file == NULL) { 1745 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); 1746 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1747 } 1748 1749 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && 1750 !test_bit(In_sync, &rdev->flags)) { 1751 sb->feature_map |= 1752 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); 1753 sb->recovery_offset = 1754 cpu_to_le64(rdev->recovery_offset); 1755 if (rdev->saved_raid_disk >= 0 && mddev->bitmap) 1756 sb->feature_map |= 1757 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); 1758 } 1759 /* Note: recovery_offset and journal_tail share space */ 1760 if (test_bit(Journal, &rdev->flags)) 1761 sb->journal_tail = cpu_to_le64(rdev->journal_tail); 1762 if (test_bit(Replacement, &rdev->flags)) 1763 sb->feature_map |= 1764 cpu_to_le32(MD_FEATURE_REPLACEMENT); 1765 1766 if (mddev->reshape_position != MaxSector) { 1767 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); 1768 sb->reshape_position = cpu_to_le64(mddev->reshape_position); 1769 sb->new_layout = cpu_to_le32(mddev->new_layout); 1770 sb->delta_disks = cpu_to_le32(mddev->delta_disks); 1771 sb->new_level = cpu_to_le32(mddev->new_level); 1772 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); 1773 if (mddev->delta_disks == 0 && 1774 mddev->reshape_backwards) 1775 sb->feature_map 1776 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); 1777 if (rdev->new_data_offset != rdev->data_offset) { 1778 sb->feature_map 1779 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); 1780 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset 1781 - rdev->data_offset)); 1782 } 1783 } 1784 1785 if (mddev_is_clustered(mddev)) 1786 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); 1787 1788 if (rdev->badblocks.count == 0) 1789 /* Nothing to do for bad blocks*/ ; 1790 else if (sb->bblog_offset == 0) 1791 /* Cannot record bad blocks on this device */ 1792 md_error(mddev, rdev); 1793 else { 1794 struct badblocks *bb = &rdev->badblocks; 1795 u64 *bbp = (u64 *)page_address(rdev->bb_page); 1796 u64 *p = bb->page; 1797 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); 1798 if (bb->changed) { 1799 unsigned seq; 1800 1801 retry: 1802 seq = read_seqbegin(&bb->lock); 1803 1804 memset(bbp, 0xff, PAGE_SIZE); 1805 1806 for (i = 0 ; i < bb->count ; i++) { 1807 u64 internal_bb = p[i]; 1808 u64 store_bb = ((BB_OFFSET(internal_bb) << 10) 1809 | BB_LEN(internal_bb)); 1810 bbp[i] = cpu_to_le64(store_bb); 1811 } 1812 bb->changed = 0; 1813 if (read_seqretry(&bb->lock, seq)) 1814 goto retry; 1815 1816 bb->sector = (rdev->sb_start + 1817 (int)le32_to_cpu(sb->bblog_offset)); 1818 bb->size = le16_to_cpu(sb->bblog_size); 1819 } 1820 } 1821 1822 max_dev = 0; 1823 rdev_for_each(rdev2, mddev) 1824 if (rdev2->desc_nr+1 > max_dev) 1825 max_dev = rdev2->desc_nr+1; 1826 1827 if (max_dev > le32_to_cpu(sb->max_dev)) { 1828 int bmask; 1829 sb->max_dev = cpu_to_le32(max_dev); 1830 rdev->sb_size = max_dev * 2 + 256; 1831 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1832 if (rdev->sb_size & bmask) 1833 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1834 } else 1835 max_dev = le32_to_cpu(sb->max_dev); 1836 1837 for (i=0; i<max_dev;i++) 1838 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); 1839 1840 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) 1841 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); 1842 1843 rdev_for_each(rdev2, mddev) { 1844 i = rdev2->desc_nr; 1845 if (test_bit(Faulty, &rdev2->flags)) 1846 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); 1847 else if (test_bit(In_sync, &rdev2->flags)) 1848 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1849 else if (test_bit(Journal, &rdev2->flags)) 1850 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); 1851 else if (rdev2->raid_disk >= 0) 1852 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1853 else 1854 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); 1855 } 1856 1857 sb->sb_csum = calc_sb_1_csum(sb); 1858 } 1859 1860 static unsigned long long 1861 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1862 { 1863 struct mdp_superblock_1 *sb; 1864 sector_t max_sectors; 1865 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1866 return 0; /* component must fit device */ 1867 if (rdev->data_offset != rdev->new_data_offset) 1868 return 0; /* too confusing */ 1869 if (rdev->sb_start < rdev->data_offset) { 1870 /* minor versions 1 and 2; superblock before data */ 1871 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; 1872 max_sectors -= rdev->data_offset; 1873 if (!num_sectors || num_sectors > max_sectors) 1874 num_sectors = max_sectors; 1875 } else if (rdev->mddev->bitmap_info.offset) { 1876 /* minor version 0 with bitmap we can't move */ 1877 return 0; 1878 } else { 1879 /* minor version 0; superblock after data */ 1880 sector_t sb_start; 1881 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; 1882 sb_start &= ~(sector_t)(4*2 - 1); 1883 max_sectors = rdev->sectors + sb_start - rdev->sb_start; 1884 if (!num_sectors || num_sectors > max_sectors) 1885 num_sectors = max_sectors; 1886 rdev->sb_start = sb_start; 1887 } 1888 sb = page_address(rdev->sb_page); 1889 sb->data_size = cpu_to_le64(num_sectors); 1890 sb->super_offset = rdev->sb_start; 1891 sb->sb_csum = calc_sb_1_csum(sb); 1892 do { 1893 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1894 rdev->sb_page); 1895 } while (md_super_wait(rdev->mddev) < 0); 1896 return num_sectors; 1897 1898 } 1899 1900 static int 1901 super_1_allow_new_offset(struct md_rdev *rdev, 1902 unsigned long long new_offset) 1903 { 1904 /* All necessary checks on new >= old have been done */ 1905 struct bitmap *bitmap; 1906 if (new_offset >= rdev->data_offset) 1907 return 1; 1908 1909 /* with 1.0 metadata, there is no metadata to tread on 1910 * so we can always move back */ 1911 if (rdev->mddev->minor_version == 0) 1912 return 1; 1913 1914 /* otherwise we must be sure not to step on 1915 * any metadata, so stay: 1916 * 36K beyond start of superblock 1917 * beyond end of badblocks 1918 * beyond write-intent bitmap 1919 */ 1920 if (rdev->sb_start + (32+4)*2 > new_offset) 1921 return 0; 1922 bitmap = rdev->mddev->bitmap; 1923 if (bitmap && !rdev->mddev->bitmap_info.file && 1924 rdev->sb_start + rdev->mddev->bitmap_info.offset + 1925 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) 1926 return 0; 1927 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) 1928 return 0; 1929 1930 return 1; 1931 } 1932 1933 static struct super_type super_types[] = { 1934 [0] = { 1935 .name = "0.90.0", 1936 .owner = THIS_MODULE, 1937 .load_super = super_90_load, 1938 .validate_super = super_90_validate, 1939 .sync_super = super_90_sync, 1940 .rdev_size_change = super_90_rdev_size_change, 1941 .allow_new_offset = super_90_allow_new_offset, 1942 }, 1943 [1] = { 1944 .name = "md-1", 1945 .owner = THIS_MODULE, 1946 .load_super = super_1_load, 1947 .validate_super = super_1_validate, 1948 .sync_super = super_1_sync, 1949 .rdev_size_change = super_1_rdev_size_change, 1950 .allow_new_offset = super_1_allow_new_offset, 1951 }, 1952 }; 1953 1954 static void sync_super(struct mddev *mddev, struct md_rdev *rdev) 1955 { 1956 if (mddev->sync_super) { 1957 mddev->sync_super(mddev, rdev); 1958 return; 1959 } 1960 1961 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); 1962 1963 super_types[mddev->major_version].sync_super(mddev, rdev); 1964 } 1965 1966 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) 1967 { 1968 struct md_rdev *rdev, *rdev2; 1969 1970 rcu_read_lock(); 1971 rdev_for_each_rcu(rdev, mddev1) { 1972 if (test_bit(Faulty, &rdev->flags) || 1973 test_bit(Journal, &rdev->flags) || 1974 rdev->raid_disk == -1) 1975 continue; 1976 rdev_for_each_rcu(rdev2, mddev2) { 1977 if (test_bit(Faulty, &rdev2->flags) || 1978 test_bit(Journal, &rdev2->flags) || 1979 rdev2->raid_disk == -1) 1980 continue; 1981 if (rdev->bdev->bd_contains == 1982 rdev2->bdev->bd_contains) { 1983 rcu_read_unlock(); 1984 return 1; 1985 } 1986 } 1987 } 1988 rcu_read_unlock(); 1989 return 0; 1990 } 1991 1992 static LIST_HEAD(pending_raid_disks); 1993 1994 /* 1995 * Try to register data integrity profile for an mddev 1996 * 1997 * This is called when an array is started and after a disk has been kicked 1998 * from the array. It only succeeds if all working and active component devices 1999 * are integrity capable with matching profiles. 2000 */ 2001 int md_integrity_register(struct mddev *mddev) 2002 { 2003 struct md_rdev *rdev, *reference = NULL; 2004 2005 if (list_empty(&mddev->disks)) 2006 return 0; /* nothing to do */ 2007 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) 2008 return 0; /* shouldn't register, or already is */ 2009 rdev_for_each(rdev, mddev) { 2010 /* skip spares and non-functional disks */ 2011 if (test_bit(Faulty, &rdev->flags)) 2012 continue; 2013 if (rdev->raid_disk < 0) 2014 continue; 2015 if (!reference) { 2016 /* Use the first rdev as the reference */ 2017 reference = rdev; 2018 continue; 2019 } 2020 /* does this rdev's profile match the reference profile? */ 2021 if (blk_integrity_compare(reference->bdev->bd_disk, 2022 rdev->bdev->bd_disk) < 0) 2023 return -EINVAL; 2024 } 2025 if (!reference || !bdev_get_integrity(reference->bdev)) 2026 return 0; 2027 /* 2028 * All component devices are integrity capable and have matching 2029 * profiles, register the common profile for the md device. 2030 */ 2031 blk_integrity_register(mddev->gendisk, 2032 bdev_get_integrity(reference->bdev)); 2033 2034 pr_debug("md: data integrity enabled on %s\n", mdname(mddev)); 2035 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { 2036 pr_err("md: failed to create integrity pool for %s\n", 2037 mdname(mddev)); 2038 return -EINVAL; 2039 } 2040 return 0; 2041 } 2042 EXPORT_SYMBOL(md_integrity_register); 2043 2044 /* 2045 * Attempt to add an rdev, but only if it is consistent with the current 2046 * integrity profile 2047 */ 2048 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) 2049 { 2050 struct blk_integrity *bi_rdev; 2051 struct blk_integrity *bi_mddev; 2052 char name[BDEVNAME_SIZE]; 2053 2054 if (!mddev->gendisk) 2055 return 0; 2056 2057 bi_rdev = bdev_get_integrity(rdev->bdev); 2058 bi_mddev = blk_get_integrity(mddev->gendisk); 2059 2060 if (!bi_mddev) /* nothing to do */ 2061 return 0; 2062 2063 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) { 2064 pr_err("%s: incompatible integrity profile for %s\n", 2065 mdname(mddev), bdevname(rdev->bdev, name)); 2066 return -ENXIO; 2067 } 2068 2069 return 0; 2070 } 2071 EXPORT_SYMBOL(md_integrity_add_rdev); 2072 2073 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) 2074 { 2075 char b[BDEVNAME_SIZE]; 2076 struct kobject *ko; 2077 int err; 2078 2079 /* prevent duplicates */ 2080 if (find_rdev(mddev, rdev->bdev->bd_dev)) 2081 return -EEXIST; 2082 2083 /* make sure rdev->sectors exceeds mddev->dev_sectors */ 2084 if (!test_bit(Journal, &rdev->flags) && 2085 rdev->sectors && 2086 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) { 2087 if (mddev->pers) { 2088 /* Cannot change size, so fail 2089 * If mddev->level <= 0, then we don't care 2090 * about aligning sizes (e.g. linear) 2091 */ 2092 if (mddev->level > 0) 2093 return -ENOSPC; 2094 } else 2095 mddev->dev_sectors = rdev->sectors; 2096 } 2097 2098 /* Verify rdev->desc_nr is unique. 2099 * If it is -1, assign a free number, else 2100 * check number is not in use 2101 */ 2102 rcu_read_lock(); 2103 if (rdev->desc_nr < 0) { 2104 int choice = 0; 2105 if (mddev->pers) 2106 choice = mddev->raid_disks; 2107 while (md_find_rdev_nr_rcu(mddev, choice)) 2108 choice++; 2109 rdev->desc_nr = choice; 2110 } else { 2111 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { 2112 rcu_read_unlock(); 2113 return -EBUSY; 2114 } 2115 } 2116 rcu_read_unlock(); 2117 if (!test_bit(Journal, &rdev->flags) && 2118 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { 2119 pr_warn("md: %s: array is limited to %d devices\n", 2120 mdname(mddev), mddev->max_disks); 2121 return -EBUSY; 2122 } 2123 bdevname(rdev->bdev,b); 2124 strreplace(b, '/', '!'); 2125 2126 rdev->mddev = mddev; 2127 pr_debug("md: bind<%s>\n", b); 2128 2129 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) 2130 goto fail; 2131 2132 ko = &part_to_dev(rdev->bdev->bd_part)->kobj; 2133 if (sysfs_create_link(&rdev->kobj, ko, "block")) 2134 /* failure here is OK */; 2135 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); 2136 2137 list_add_rcu(&rdev->same_set, &mddev->disks); 2138 bd_link_disk_holder(rdev->bdev, mddev->gendisk); 2139 2140 /* May as well allow recovery to be retried once */ 2141 mddev->recovery_disabled++; 2142 2143 return 0; 2144 2145 fail: 2146 pr_warn("md: failed to register dev-%s for %s\n", 2147 b, mdname(mddev)); 2148 return err; 2149 } 2150 2151 static void md_delayed_delete(struct work_struct *ws) 2152 { 2153 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); 2154 kobject_del(&rdev->kobj); 2155 kobject_put(&rdev->kobj); 2156 } 2157 2158 static void unbind_rdev_from_array(struct md_rdev *rdev) 2159 { 2160 char b[BDEVNAME_SIZE]; 2161 2162 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); 2163 list_del_rcu(&rdev->same_set); 2164 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b)); 2165 rdev->mddev = NULL; 2166 sysfs_remove_link(&rdev->kobj, "block"); 2167 sysfs_put(rdev->sysfs_state); 2168 rdev->sysfs_state = NULL; 2169 rdev->badblocks.count = 0; 2170 /* We need to delay this, otherwise we can deadlock when 2171 * writing to 'remove' to "dev/state". We also need 2172 * to delay it due to rcu usage. 2173 */ 2174 synchronize_rcu(); 2175 INIT_WORK(&rdev->del_work, md_delayed_delete); 2176 kobject_get(&rdev->kobj); 2177 queue_work(md_misc_wq, &rdev->del_work); 2178 } 2179 2180 /* 2181 * prevent the device from being mounted, repartitioned or 2182 * otherwise reused by a RAID array (or any other kernel 2183 * subsystem), by bd_claiming the device. 2184 */ 2185 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) 2186 { 2187 int err = 0; 2188 struct block_device *bdev; 2189 char b[BDEVNAME_SIZE]; 2190 2191 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 2192 shared ? (struct md_rdev *)lock_rdev : rdev); 2193 if (IS_ERR(bdev)) { 2194 pr_warn("md: could not open %s.\n", __bdevname(dev, b)); 2195 return PTR_ERR(bdev); 2196 } 2197 rdev->bdev = bdev; 2198 return err; 2199 } 2200 2201 static void unlock_rdev(struct md_rdev *rdev) 2202 { 2203 struct block_device *bdev = rdev->bdev; 2204 rdev->bdev = NULL; 2205 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 2206 } 2207 2208 void md_autodetect_dev(dev_t dev); 2209 2210 static void export_rdev(struct md_rdev *rdev) 2211 { 2212 char b[BDEVNAME_SIZE]; 2213 2214 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b)); 2215 md_rdev_clear(rdev); 2216 #ifndef MODULE 2217 if (test_bit(AutoDetected, &rdev->flags)) 2218 md_autodetect_dev(rdev->bdev->bd_dev); 2219 #endif 2220 unlock_rdev(rdev); 2221 kobject_put(&rdev->kobj); 2222 } 2223 2224 void md_kick_rdev_from_array(struct md_rdev *rdev) 2225 { 2226 unbind_rdev_from_array(rdev); 2227 export_rdev(rdev); 2228 } 2229 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); 2230 2231 static void export_array(struct mddev *mddev) 2232 { 2233 struct md_rdev *rdev; 2234 2235 while (!list_empty(&mddev->disks)) { 2236 rdev = list_first_entry(&mddev->disks, struct md_rdev, 2237 same_set); 2238 md_kick_rdev_from_array(rdev); 2239 } 2240 mddev->raid_disks = 0; 2241 mddev->major_version = 0; 2242 } 2243 2244 static void sync_sbs(struct mddev *mddev, int nospares) 2245 { 2246 /* Update each superblock (in-memory image), but 2247 * if we are allowed to, skip spares which already 2248 * have the right event counter, or have one earlier 2249 * (which would mean they aren't being marked as dirty 2250 * with the rest of the array) 2251 */ 2252 struct md_rdev *rdev; 2253 rdev_for_each(rdev, mddev) { 2254 if (rdev->sb_events == mddev->events || 2255 (nospares && 2256 rdev->raid_disk < 0 && 2257 rdev->sb_events+1 == mddev->events)) { 2258 /* Don't update this superblock */ 2259 rdev->sb_loaded = 2; 2260 } else { 2261 sync_super(mddev, rdev); 2262 rdev->sb_loaded = 1; 2263 } 2264 } 2265 } 2266 2267 static bool does_sb_need_changing(struct mddev *mddev) 2268 { 2269 struct md_rdev *rdev; 2270 struct mdp_superblock_1 *sb; 2271 int role; 2272 2273 /* Find a good rdev */ 2274 rdev_for_each(rdev, mddev) 2275 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) 2276 break; 2277 2278 /* No good device found. */ 2279 if (!rdev) 2280 return false; 2281 2282 sb = page_address(rdev->sb_page); 2283 /* Check if a device has become faulty or a spare become active */ 2284 rdev_for_each(rdev, mddev) { 2285 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 2286 /* Device activated? */ 2287 if (role == 0xffff && rdev->raid_disk >=0 && 2288 !test_bit(Faulty, &rdev->flags)) 2289 return true; 2290 /* Device turned faulty? */ 2291 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) 2292 return true; 2293 } 2294 2295 /* Check if any mddev parameters have changed */ 2296 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || 2297 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || 2298 (mddev->layout != le64_to_cpu(sb->layout)) || 2299 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || 2300 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) 2301 return true; 2302 2303 return false; 2304 } 2305 2306 void md_update_sb(struct mddev *mddev, int force_change) 2307 { 2308 struct md_rdev *rdev; 2309 int sync_req; 2310 int nospares = 0; 2311 int any_badblocks_changed = 0; 2312 int ret = -1; 2313 2314 if (mddev->ro) { 2315 if (force_change) 2316 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2317 return; 2318 } 2319 2320 repeat: 2321 if (mddev_is_clustered(mddev)) { 2322 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) 2323 force_change = 1; 2324 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) 2325 nospares = 1; 2326 ret = md_cluster_ops->metadata_update_start(mddev); 2327 /* Has someone else has updated the sb */ 2328 if (!does_sb_need_changing(mddev)) { 2329 if (ret == 0) 2330 md_cluster_ops->metadata_update_cancel(mddev); 2331 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), 2332 BIT(MD_SB_CHANGE_DEVS) | 2333 BIT(MD_SB_CHANGE_CLEAN)); 2334 return; 2335 } 2336 } 2337 2338 /* First make sure individual recovery_offsets are correct */ 2339 rdev_for_each(rdev, mddev) { 2340 if (rdev->raid_disk >= 0 && 2341 mddev->delta_disks >= 0 && 2342 !test_bit(Journal, &rdev->flags) && 2343 !test_bit(In_sync, &rdev->flags) && 2344 mddev->curr_resync_completed > rdev->recovery_offset) 2345 rdev->recovery_offset = mddev->curr_resync_completed; 2346 2347 } 2348 if (!mddev->persistent) { 2349 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 2350 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2351 if (!mddev->external) { 2352 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 2353 rdev_for_each(rdev, mddev) { 2354 if (rdev->badblocks.changed) { 2355 rdev->badblocks.changed = 0; 2356 ack_all_badblocks(&rdev->badblocks); 2357 md_error(mddev, rdev); 2358 } 2359 clear_bit(Blocked, &rdev->flags); 2360 clear_bit(BlockedBadBlocks, &rdev->flags); 2361 wake_up(&rdev->blocked_wait); 2362 } 2363 } 2364 wake_up(&mddev->sb_wait); 2365 return; 2366 } 2367 2368 spin_lock(&mddev->lock); 2369 2370 mddev->utime = ktime_get_real_seconds(); 2371 2372 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) 2373 force_change = 1; 2374 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) 2375 /* just a clean<-> dirty transition, possibly leave spares alone, 2376 * though if events isn't the right even/odd, we will have to do 2377 * spares after all 2378 */ 2379 nospares = 1; 2380 if (force_change) 2381 nospares = 0; 2382 if (mddev->degraded) 2383 /* If the array is degraded, then skipping spares is both 2384 * dangerous and fairly pointless. 2385 * Dangerous because a device that was removed from the array 2386 * might have a event_count that still looks up-to-date, 2387 * so it can be re-added without a resync. 2388 * Pointless because if there are any spares to skip, 2389 * then a recovery will happen and soon that array won't 2390 * be degraded any more and the spare can go back to sleep then. 2391 */ 2392 nospares = 0; 2393 2394 sync_req = mddev->in_sync; 2395 2396 /* If this is just a dirty<->clean transition, and the array is clean 2397 * and 'events' is odd, we can roll back to the previous clean state */ 2398 if (nospares 2399 && (mddev->in_sync && mddev->recovery_cp == MaxSector) 2400 && mddev->can_decrease_events 2401 && mddev->events != 1) { 2402 mddev->events--; 2403 mddev->can_decrease_events = 0; 2404 } else { 2405 /* otherwise we have to go forward and ... */ 2406 mddev->events ++; 2407 mddev->can_decrease_events = nospares; 2408 } 2409 2410 /* 2411 * This 64-bit counter should never wrap. 2412 * Either we are in around ~1 trillion A.C., assuming 2413 * 1 reboot per second, or we have a bug... 2414 */ 2415 WARN_ON(mddev->events == 0); 2416 2417 rdev_for_each(rdev, mddev) { 2418 if (rdev->badblocks.changed) 2419 any_badblocks_changed++; 2420 if (test_bit(Faulty, &rdev->flags)) 2421 set_bit(FaultRecorded, &rdev->flags); 2422 } 2423 2424 sync_sbs(mddev, nospares); 2425 spin_unlock(&mddev->lock); 2426 2427 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", 2428 mdname(mddev), mddev->in_sync); 2429 2430 if (mddev->queue) 2431 blk_add_trace_msg(mddev->queue, "md md_update_sb"); 2432 rewrite: 2433 bitmap_update_sb(mddev->bitmap); 2434 rdev_for_each(rdev, mddev) { 2435 char b[BDEVNAME_SIZE]; 2436 2437 if (rdev->sb_loaded != 1) 2438 continue; /* no noise on spare devices */ 2439 2440 if (!test_bit(Faulty, &rdev->flags)) { 2441 md_super_write(mddev,rdev, 2442 rdev->sb_start, rdev->sb_size, 2443 rdev->sb_page); 2444 pr_debug("md: (write) %s's sb offset: %llu\n", 2445 bdevname(rdev->bdev, b), 2446 (unsigned long long)rdev->sb_start); 2447 rdev->sb_events = mddev->events; 2448 if (rdev->badblocks.size) { 2449 md_super_write(mddev, rdev, 2450 rdev->badblocks.sector, 2451 rdev->badblocks.size << 9, 2452 rdev->bb_page); 2453 rdev->badblocks.size = 0; 2454 } 2455 2456 } else 2457 pr_debug("md: %s (skipping faulty)\n", 2458 bdevname(rdev->bdev, b)); 2459 2460 if (mddev->level == LEVEL_MULTIPATH) 2461 /* only need to write one superblock... */ 2462 break; 2463 } 2464 if (md_super_wait(mddev) < 0) 2465 goto rewrite; 2466 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */ 2467 2468 if (mddev_is_clustered(mddev) && ret == 0) 2469 md_cluster_ops->metadata_update_finish(mddev); 2470 2471 if (mddev->in_sync != sync_req || 2472 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), 2473 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN))) 2474 /* have to write it out again */ 2475 goto repeat; 2476 wake_up(&mddev->sb_wait); 2477 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 2478 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 2479 2480 rdev_for_each(rdev, mddev) { 2481 if (test_and_clear_bit(FaultRecorded, &rdev->flags)) 2482 clear_bit(Blocked, &rdev->flags); 2483 2484 if (any_badblocks_changed) 2485 ack_all_badblocks(&rdev->badblocks); 2486 clear_bit(BlockedBadBlocks, &rdev->flags); 2487 wake_up(&rdev->blocked_wait); 2488 } 2489 } 2490 EXPORT_SYMBOL(md_update_sb); 2491 2492 static int add_bound_rdev(struct md_rdev *rdev) 2493 { 2494 struct mddev *mddev = rdev->mddev; 2495 int err = 0; 2496 bool add_journal = test_bit(Journal, &rdev->flags); 2497 2498 if (!mddev->pers->hot_remove_disk || add_journal) { 2499 /* If there is hot_add_disk but no hot_remove_disk 2500 * then added disks for geometry changes, 2501 * and should be added immediately. 2502 */ 2503 super_types[mddev->major_version]. 2504 validate_super(mddev, rdev); 2505 if (add_journal) 2506 mddev_suspend(mddev); 2507 err = mddev->pers->hot_add_disk(mddev, rdev); 2508 if (add_journal) 2509 mddev_resume(mddev); 2510 if (err) { 2511 md_kick_rdev_from_array(rdev); 2512 return err; 2513 } 2514 } 2515 sysfs_notify_dirent_safe(rdev->sysfs_state); 2516 2517 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2518 if (mddev->degraded) 2519 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 2520 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2521 md_new_event(mddev); 2522 md_wakeup_thread(mddev->thread); 2523 return 0; 2524 } 2525 2526 /* words written to sysfs files may, or may not, be \n terminated. 2527 * We want to accept with case. For this we use cmd_match. 2528 */ 2529 static int cmd_match(const char *cmd, const char *str) 2530 { 2531 /* See if cmd, written into a sysfs file, matches 2532 * str. They must either be the same, or cmd can 2533 * have a trailing newline 2534 */ 2535 while (*cmd && *str && *cmd == *str) { 2536 cmd++; 2537 str++; 2538 } 2539 if (*cmd == '\n') 2540 cmd++; 2541 if (*str || *cmd) 2542 return 0; 2543 return 1; 2544 } 2545 2546 struct rdev_sysfs_entry { 2547 struct attribute attr; 2548 ssize_t (*show)(struct md_rdev *, char *); 2549 ssize_t (*store)(struct md_rdev *, const char *, size_t); 2550 }; 2551 2552 static ssize_t 2553 state_show(struct md_rdev *rdev, char *page) 2554 { 2555 char *sep = ","; 2556 size_t len = 0; 2557 unsigned long flags = ACCESS_ONCE(rdev->flags); 2558 2559 if (test_bit(Faulty, &flags) || 2560 (!test_bit(ExternalBbl, &flags) && 2561 rdev->badblocks.unacked_exist)) 2562 len += sprintf(page+len, "faulty%s", sep); 2563 if (test_bit(In_sync, &flags)) 2564 len += sprintf(page+len, "in_sync%s", sep); 2565 if (test_bit(Journal, &flags)) 2566 len += sprintf(page+len, "journal%s", sep); 2567 if (test_bit(WriteMostly, &flags)) 2568 len += sprintf(page+len, "write_mostly%s", sep); 2569 if (test_bit(Blocked, &flags) || 2570 (rdev->badblocks.unacked_exist 2571 && !test_bit(Faulty, &flags))) 2572 len += sprintf(page+len, "blocked%s", sep); 2573 if (!test_bit(Faulty, &flags) && 2574 !test_bit(Journal, &flags) && 2575 !test_bit(In_sync, &flags)) 2576 len += sprintf(page+len, "spare%s", sep); 2577 if (test_bit(WriteErrorSeen, &flags)) 2578 len += sprintf(page+len, "write_error%s", sep); 2579 if (test_bit(WantReplacement, &flags)) 2580 len += sprintf(page+len, "want_replacement%s", sep); 2581 if (test_bit(Replacement, &flags)) 2582 len += sprintf(page+len, "replacement%s", sep); 2583 if (test_bit(ExternalBbl, &flags)) 2584 len += sprintf(page+len, "external_bbl%s", sep); 2585 if (test_bit(FailFast, &flags)) 2586 len += sprintf(page+len, "failfast%s", sep); 2587 2588 if (len) 2589 len -= strlen(sep); 2590 2591 return len+sprintf(page+len, "\n"); 2592 } 2593 2594 static ssize_t 2595 state_store(struct md_rdev *rdev, const char *buf, size_t len) 2596 { 2597 /* can write 2598 * faulty - simulates an error 2599 * remove - disconnects the device 2600 * writemostly - sets write_mostly 2601 * -writemostly - clears write_mostly 2602 * blocked - sets the Blocked flags 2603 * -blocked - clears the Blocked and possibly simulates an error 2604 * insync - sets Insync providing device isn't active 2605 * -insync - clear Insync for a device with a slot assigned, 2606 * so that it gets rebuilt based on bitmap 2607 * write_error - sets WriteErrorSeen 2608 * -write_error - clears WriteErrorSeen 2609 * {,-}failfast - set/clear FailFast 2610 */ 2611 int err = -EINVAL; 2612 if (cmd_match(buf, "faulty") && rdev->mddev->pers) { 2613 md_error(rdev->mddev, rdev); 2614 if (test_bit(Faulty, &rdev->flags)) 2615 err = 0; 2616 else 2617 err = -EBUSY; 2618 } else if (cmd_match(buf, "remove")) { 2619 if (rdev->mddev->pers) { 2620 clear_bit(Blocked, &rdev->flags); 2621 remove_and_add_spares(rdev->mddev, rdev); 2622 } 2623 if (rdev->raid_disk >= 0) 2624 err = -EBUSY; 2625 else { 2626 struct mddev *mddev = rdev->mddev; 2627 err = 0; 2628 if (mddev_is_clustered(mddev)) 2629 err = md_cluster_ops->remove_disk(mddev, rdev); 2630 2631 if (err == 0) { 2632 md_kick_rdev_from_array(rdev); 2633 if (mddev->pers) { 2634 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2635 md_wakeup_thread(mddev->thread); 2636 } 2637 md_new_event(mddev); 2638 } 2639 } 2640 } else if (cmd_match(buf, "writemostly")) { 2641 set_bit(WriteMostly, &rdev->flags); 2642 err = 0; 2643 } else if (cmd_match(buf, "-writemostly")) { 2644 clear_bit(WriteMostly, &rdev->flags); 2645 err = 0; 2646 } else if (cmd_match(buf, "blocked")) { 2647 set_bit(Blocked, &rdev->flags); 2648 err = 0; 2649 } else if (cmd_match(buf, "-blocked")) { 2650 if (!test_bit(Faulty, &rdev->flags) && 2651 !test_bit(ExternalBbl, &rdev->flags) && 2652 rdev->badblocks.unacked_exist) { 2653 /* metadata handler doesn't understand badblocks, 2654 * so we need to fail the device 2655 */ 2656 md_error(rdev->mddev, rdev); 2657 } 2658 clear_bit(Blocked, &rdev->flags); 2659 clear_bit(BlockedBadBlocks, &rdev->flags); 2660 wake_up(&rdev->blocked_wait); 2661 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2662 md_wakeup_thread(rdev->mddev->thread); 2663 2664 err = 0; 2665 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { 2666 set_bit(In_sync, &rdev->flags); 2667 err = 0; 2668 } else if (cmd_match(buf, "failfast")) { 2669 set_bit(FailFast, &rdev->flags); 2670 err = 0; 2671 } else if (cmd_match(buf, "-failfast")) { 2672 clear_bit(FailFast, &rdev->flags); 2673 err = 0; 2674 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && 2675 !test_bit(Journal, &rdev->flags)) { 2676 if (rdev->mddev->pers == NULL) { 2677 clear_bit(In_sync, &rdev->flags); 2678 rdev->saved_raid_disk = rdev->raid_disk; 2679 rdev->raid_disk = -1; 2680 err = 0; 2681 } 2682 } else if (cmd_match(buf, "write_error")) { 2683 set_bit(WriteErrorSeen, &rdev->flags); 2684 err = 0; 2685 } else if (cmd_match(buf, "-write_error")) { 2686 clear_bit(WriteErrorSeen, &rdev->flags); 2687 err = 0; 2688 } else if (cmd_match(buf, "want_replacement")) { 2689 /* Any non-spare device that is not a replacement can 2690 * become want_replacement at any time, but we then need to 2691 * check if recovery is needed. 2692 */ 2693 if (rdev->raid_disk >= 0 && 2694 !test_bit(Journal, &rdev->flags) && 2695 !test_bit(Replacement, &rdev->flags)) 2696 set_bit(WantReplacement, &rdev->flags); 2697 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2698 md_wakeup_thread(rdev->mddev->thread); 2699 err = 0; 2700 } else if (cmd_match(buf, "-want_replacement")) { 2701 /* Clearing 'want_replacement' is always allowed. 2702 * Once replacements starts it is too late though. 2703 */ 2704 err = 0; 2705 clear_bit(WantReplacement, &rdev->flags); 2706 } else if (cmd_match(buf, "replacement")) { 2707 /* Can only set a device as a replacement when array has not 2708 * yet been started. Once running, replacement is automatic 2709 * from spares, or by assigning 'slot'. 2710 */ 2711 if (rdev->mddev->pers) 2712 err = -EBUSY; 2713 else { 2714 set_bit(Replacement, &rdev->flags); 2715 err = 0; 2716 } 2717 } else if (cmd_match(buf, "-replacement")) { 2718 /* Similarly, can only clear Replacement before start */ 2719 if (rdev->mddev->pers) 2720 err = -EBUSY; 2721 else { 2722 clear_bit(Replacement, &rdev->flags); 2723 err = 0; 2724 } 2725 } else if (cmd_match(buf, "re-add")) { 2726 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) { 2727 /* clear_bit is performed _after_ all the devices 2728 * have their local Faulty bit cleared. If any writes 2729 * happen in the meantime in the local node, they 2730 * will land in the local bitmap, which will be synced 2731 * by this node eventually 2732 */ 2733 if (!mddev_is_clustered(rdev->mddev) || 2734 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { 2735 clear_bit(Faulty, &rdev->flags); 2736 err = add_bound_rdev(rdev); 2737 } 2738 } else 2739 err = -EBUSY; 2740 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) { 2741 set_bit(ExternalBbl, &rdev->flags); 2742 rdev->badblocks.shift = 0; 2743 err = 0; 2744 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) { 2745 clear_bit(ExternalBbl, &rdev->flags); 2746 err = 0; 2747 } 2748 if (!err) 2749 sysfs_notify_dirent_safe(rdev->sysfs_state); 2750 return err ? err : len; 2751 } 2752 static struct rdev_sysfs_entry rdev_state = 2753 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); 2754 2755 static ssize_t 2756 errors_show(struct md_rdev *rdev, char *page) 2757 { 2758 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); 2759 } 2760 2761 static ssize_t 2762 errors_store(struct md_rdev *rdev, const char *buf, size_t len) 2763 { 2764 unsigned int n; 2765 int rv; 2766 2767 rv = kstrtouint(buf, 10, &n); 2768 if (rv < 0) 2769 return rv; 2770 atomic_set(&rdev->corrected_errors, n); 2771 return len; 2772 } 2773 static struct rdev_sysfs_entry rdev_errors = 2774 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); 2775 2776 static ssize_t 2777 slot_show(struct md_rdev *rdev, char *page) 2778 { 2779 if (test_bit(Journal, &rdev->flags)) 2780 return sprintf(page, "journal\n"); 2781 else if (rdev->raid_disk < 0) 2782 return sprintf(page, "none\n"); 2783 else 2784 return sprintf(page, "%d\n", rdev->raid_disk); 2785 } 2786 2787 static ssize_t 2788 slot_store(struct md_rdev *rdev, const char *buf, size_t len) 2789 { 2790 int slot; 2791 int err; 2792 2793 if (test_bit(Journal, &rdev->flags)) 2794 return -EBUSY; 2795 if (strncmp(buf, "none", 4)==0) 2796 slot = -1; 2797 else { 2798 err = kstrtouint(buf, 10, (unsigned int *)&slot); 2799 if (err < 0) 2800 return err; 2801 } 2802 if (rdev->mddev->pers && slot == -1) { 2803 /* Setting 'slot' on an active array requires also 2804 * updating the 'rd%d' link, and communicating 2805 * with the personality with ->hot_*_disk. 2806 * For now we only support removing 2807 * failed/spare devices. This normally happens automatically, 2808 * but not when the metadata is externally managed. 2809 */ 2810 if (rdev->raid_disk == -1) 2811 return -EEXIST; 2812 /* personality does all needed checks */ 2813 if (rdev->mddev->pers->hot_remove_disk == NULL) 2814 return -EINVAL; 2815 clear_bit(Blocked, &rdev->flags); 2816 remove_and_add_spares(rdev->mddev, rdev); 2817 if (rdev->raid_disk >= 0) 2818 return -EBUSY; 2819 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2820 md_wakeup_thread(rdev->mddev->thread); 2821 } else if (rdev->mddev->pers) { 2822 /* Activating a spare .. or possibly reactivating 2823 * if we ever get bitmaps working here. 2824 */ 2825 int err; 2826 2827 if (rdev->raid_disk != -1) 2828 return -EBUSY; 2829 2830 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) 2831 return -EBUSY; 2832 2833 if (rdev->mddev->pers->hot_add_disk == NULL) 2834 return -EINVAL; 2835 2836 if (slot >= rdev->mddev->raid_disks && 2837 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 2838 return -ENOSPC; 2839 2840 rdev->raid_disk = slot; 2841 if (test_bit(In_sync, &rdev->flags)) 2842 rdev->saved_raid_disk = slot; 2843 else 2844 rdev->saved_raid_disk = -1; 2845 clear_bit(In_sync, &rdev->flags); 2846 clear_bit(Bitmap_sync, &rdev->flags); 2847 err = rdev->mddev->pers-> 2848 hot_add_disk(rdev->mddev, rdev); 2849 if (err) { 2850 rdev->raid_disk = -1; 2851 return err; 2852 } else 2853 sysfs_notify_dirent_safe(rdev->sysfs_state); 2854 if (sysfs_link_rdev(rdev->mddev, rdev)) 2855 /* failure here is OK */; 2856 /* don't wakeup anyone, leave that to userspace. */ 2857 } else { 2858 if (slot >= rdev->mddev->raid_disks && 2859 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 2860 return -ENOSPC; 2861 rdev->raid_disk = slot; 2862 /* assume it is working */ 2863 clear_bit(Faulty, &rdev->flags); 2864 clear_bit(WriteMostly, &rdev->flags); 2865 set_bit(In_sync, &rdev->flags); 2866 sysfs_notify_dirent_safe(rdev->sysfs_state); 2867 } 2868 return len; 2869 } 2870 2871 static struct rdev_sysfs_entry rdev_slot = 2872 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); 2873 2874 static ssize_t 2875 offset_show(struct md_rdev *rdev, char *page) 2876 { 2877 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); 2878 } 2879 2880 static ssize_t 2881 offset_store(struct md_rdev *rdev, const char *buf, size_t len) 2882 { 2883 unsigned long long offset; 2884 if (kstrtoull(buf, 10, &offset) < 0) 2885 return -EINVAL; 2886 if (rdev->mddev->pers && rdev->raid_disk >= 0) 2887 return -EBUSY; 2888 if (rdev->sectors && rdev->mddev->external) 2889 /* Must set offset before size, so overlap checks 2890 * can be sane */ 2891 return -EBUSY; 2892 rdev->data_offset = offset; 2893 rdev->new_data_offset = offset; 2894 return len; 2895 } 2896 2897 static struct rdev_sysfs_entry rdev_offset = 2898 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); 2899 2900 static ssize_t new_offset_show(struct md_rdev *rdev, char *page) 2901 { 2902 return sprintf(page, "%llu\n", 2903 (unsigned long long)rdev->new_data_offset); 2904 } 2905 2906 static ssize_t new_offset_store(struct md_rdev *rdev, 2907 const char *buf, size_t len) 2908 { 2909 unsigned long long new_offset; 2910 struct mddev *mddev = rdev->mddev; 2911 2912 if (kstrtoull(buf, 10, &new_offset) < 0) 2913 return -EINVAL; 2914 2915 if (mddev->sync_thread || 2916 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) 2917 return -EBUSY; 2918 if (new_offset == rdev->data_offset) 2919 /* reset is always permitted */ 2920 ; 2921 else if (new_offset > rdev->data_offset) { 2922 /* must not push array size beyond rdev_sectors */ 2923 if (new_offset - rdev->data_offset 2924 + mddev->dev_sectors > rdev->sectors) 2925 return -E2BIG; 2926 } 2927 /* Metadata worries about other space details. */ 2928 2929 /* decreasing the offset is inconsistent with a backwards 2930 * reshape. 2931 */ 2932 if (new_offset < rdev->data_offset && 2933 mddev->reshape_backwards) 2934 return -EINVAL; 2935 /* Increasing offset is inconsistent with forwards 2936 * reshape. reshape_direction should be set to 2937 * 'backwards' first. 2938 */ 2939 if (new_offset > rdev->data_offset && 2940 !mddev->reshape_backwards) 2941 return -EINVAL; 2942 2943 if (mddev->pers && mddev->persistent && 2944 !super_types[mddev->major_version] 2945 .allow_new_offset(rdev, new_offset)) 2946 return -E2BIG; 2947 rdev->new_data_offset = new_offset; 2948 if (new_offset > rdev->data_offset) 2949 mddev->reshape_backwards = 1; 2950 else if (new_offset < rdev->data_offset) 2951 mddev->reshape_backwards = 0; 2952 2953 return len; 2954 } 2955 static struct rdev_sysfs_entry rdev_new_offset = 2956 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); 2957 2958 static ssize_t 2959 rdev_size_show(struct md_rdev *rdev, char *page) 2960 { 2961 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); 2962 } 2963 2964 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) 2965 { 2966 /* check if two start/length pairs overlap */ 2967 if (s1+l1 <= s2) 2968 return 0; 2969 if (s2+l2 <= s1) 2970 return 0; 2971 return 1; 2972 } 2973 2974 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) 2975 { 2976 unsigned long long blocks; 2977 sector_t new; 2978 2979 if (kstrtoull(buf, 10, &blocks) < 0) 2980 return -EINVAL; 2981 2982 if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) 2983 return -EINVAL; /* sector conversion overflow */ 2984 2985 new = blocks * 2; 2986 if (new != blocks * 2) 2987 return -EINVAL; /* unsigned long long to sector_t overflow */ 2988 2989 *sectors = new; 2990 return 0; 2991 } 2992 2993 static ssize_t 2994 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) 2995 { 2996 struct mddev *my_mddev = rdev->mddev; 2997 sector_t oldsectors = rdev->sectors; 2998 sector_t sectors; 2999 3000 if (test_bit(Journal, &rdev->flags)) 3001 return -EBUSY; 3002 if (strict_blocks_to_sectors(buf, §ors) < 0) 3003 return -EINVAL; 3004 if (rdev->data_offset != rdev->new_data_offset) 3005 return -EINVAL; /* too confusing */ 3006 if (my_mddev->pers && rdev->raid_disk >= 0) { 3007 if (my_mddev->persistent) { 3008 sectors = super_types[my_mddev->major_version]. 3009 rdev_size_change(rdev, sectors); 3010 if (!sectors) 3011 return -EBUSY; 3012 } else if (!sectors) 3013 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - 3014 rdev->data_offset; 3015 if (!my_mddev->pers->resize) 3016 /* Cannot change size for RAID0 or Linear etc */ 3017 return -EINVAL; 3018 } 3019 if (sectors < my_mddev->dev_sectors) 3020 return -EINVAL; /* component must fit device */ 3021 3022 rdev->sectors = sectors; 3023 if (sectors > oldsectors && my_mddev->external) { 3024 /* Need to check that all other rdevs with the same 3025 * ->bdev do not overlap. 'rcu' is sufficient to walk 3026 * the rdev lists safely. 3027 * This check does not provide a hard guarantee, it 3028 * just helps avoid dangerous mistakes. 3029 */ 3030 struct mddev *mddev; 3031 int overlap = 0; 3032 struct list_head *tmp; 3033 3034 rcu_read_lock(); 3035 for_each_mddev(mddev, tmp) { 3036 struct md_rdev *rdev2; 3037 3038 rdev_for_each(rdev2, mddev) 3039 if (rdev->bdev == rdev2->bdev && 3040 rdev != rdev2 && 3041 overlaps(rdev->data_offset, rdev->sectors, 3042 rdev2->data_offset, 3043 rdev2->sectors)) { 3044 overlap = 1; 3045 break; 3046 } 3047 if (overlap) { 3048 mddev_put(mddev); 3049 break; 3050 } 3051 } 3052 rcu_read_unlock(); 3053 if (overlap) { 3054 /* Someone else could have slipped in a size 3055 * change here, but doing so is just silly. 3056 * We put oldsectors back because we *know* it is 3057 * safe, and trust userspace not to race with 3058 * itself 3059 */ 3060 rdev->sectors = oldsectors; 3061 return -EBUSY; 3062 } 3063 } 3064 return len; 3065 } 3066 3067 static struct rdev_sysfs_entry rdev_size = 3068 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); 3069 3070 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) 3071 { 3072 unsigned long long recovery_start = rdev->recovery_offset; 3073 3074 if (test_bit(In_sync, &rdev->flags) || 3075 recovery_start == MaxSector) 3076 return sprintf(page, "none\n"); 3077 3078 return sprintf(page, "%llu\n", recovery_start); 3079 } 3080 3081 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) 3082 { 3083 unsigned long long recovery_start; 3084 3085 if (cmd_match(buf, "none")) 3086 recovery_start = MaxSector; 3087 else if (kstrtoull(buf, 10, &recovery_start)) 3088 return -EINVAL; 3089 3090 if (rdev->mddev->pers && 3091 rdev->raid_disk >= 0) 3092 return -EBUSY; 3093 3094 rdev->recovery_offset = recovery_start; 3095 if (recovery_start == MaxSector) 3096 set_bit(In_sync, &rdev->flags); 3097 else 3098 clear_bit(In_sync, &rdev->flags); 3099 return len; 3100 } 3101 3102 static struct rdev_sysfs_entry rdev_recovery_start = 3103 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); 3104 3105 /* sysfs access to bad-blocks list. 3106 * We present two files. 3107 * 'bad-blocks' lists sector numbers and lengths of ranges that 3108 * are recorded as bad. The list is truncated to fit within 3109 * the one-page limit of sysfs. 3110 * Writing "sector length" to this file adds an acknowledged 3111 * bad block list. 3112 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet 3113 * been acknowledged. Writing to this file adds bad blocks 3114 * without acknowledging them. This is largely for testing. 3115 */ 3116 static ssize_t bb_show(struct md_rdev *rdev, char *page) 3117 { 3118 return badblocks_show(&rdev->badblocks, page, 0); 3119 } 3120 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) 3121 { 3122 int rv = badblocks_store(&rdev->badblocks, page, len, 0); 3123 /* Maybe that ack was all we needed */ 3124 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) 3125 wake_up(&rdev->blocked_wait); 3126 return rv; 3127 } 3128 static struct rdev_sysfs_entry rdev_bad_blocks = 3129 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); 3130 3131 static ssize_t ubb_show(struct md_rdev *rdev, char *page) 3132 { 3133 return badblocks_show(&rdev->badblocks, page, 1); 3134 } 3135 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) 3136 { 3137 return badblocks_store(&rdev->badblocks, page, len, 1); 3138 } 3139 static struct rdev_sysfs_entry rdev_unack_bad_blocks = 3140 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); 3141 3142 static struct attribute *rdev_default_attrs[] = { 3143 &rdev_state.attr, 3144 &rdev_errors.attr, 3145 &rdev_slot.attr, 3146 &rdev_offset.attr, 3147 &rdev_new_offset.attr, 3148 &rdev_size.attr, 3149 &rdev_recovery_start.attr, 3150 &rdev_bad_blocks.attr, 3151 &rdev_unack_bad_blocks.attr, 3152 NULL, 3153 }; 3154 static ssize_t 3155 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 3156 { 3157 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 3158 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 3159 3160 if (!entry->show) 3161 return -EIO; 3162 if (!rdev->mddev) 3163 return -EBUSY; 3164 return entry->show(rdev, page); 3165 } 3166 3167 static ssize_t 3168 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 3169 const char *page, size_t length) 3170 { 3171 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 3172 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 3173 ssize_t rv; 3174 struct mddev *mddev = rdev->mddev; 3175 3176 if (!entry->store) 3177 return -EIO; 3178 if (!capable(CAP_SYS_ADMIN)) 3179 return -EACCES; 3180 rv = mddev ? mddev_lock(mddev): -EBUSY; 3181 if (!rv) { 3182 if (rdev->mddev == NULL) 3183 rv = -EBUSY; 3184 else 3185 rv = entry->store(rdev, page, length); 3186 mddev_unlock(mddev); 3187 } 3188 return rv; 3189 } 3190 3191 static void rdev_free(struct kobject *ko) 3192 { 3193 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); 3194 kfree(rdev); 3195 } 3196 static const struct sysfs_ops rdev_sysfs_ops = { 3197 .show = rdev_attr_show, 3198 .store = rdev_attr_store, 3199 }; 3200 static struct kobj_type rdev_ktype = { 3201 .release = rdev_free, 3202 .sysfs_ops = &rdev_sysfs_ops, 3203 .default_attrs = rdev_default_attrs, 3204 }; 3205 3206 int md_rdev_init(struct md_rdev *rdev) 3207 { 3208 rdev->desc_nr = -1; 3209 rdev->saved_raid_disk = -1; 3210 rdev->raid_disk = -1; 3211 rdev->flags = 0; 3212 rdev->data_offset = 0; 3213 rdev->new_data_offset = 0; 3214 rdev->sb_events = 0; 3215 rdev->last_read_error = 0; 3216 rdev->sb_loaded = 0; 3217 rdev->bb_page = NULL; 3218 atomic_set(&rdev->nr_pending, 0); 3219 atomic_set(&rdev->read_errors, 0); 3220 atomic_set(&rdev->corrected_errors, 0); 3221 3222 INIT_LIST_HEAD(&rdev->same_set); 3223 init_waitqueue_head(&rdev->blocked_wait); 3224 3225 /* Add space to store bad block list. 3226 * This reserves the space even on arrays where it cannot 3227 * be used - I wonder if that matters 3228 */ 3229 return badblocks_init(&rdev->badblocks, 0); 3230 } 3231 EXPORT_SYMBOL_GPL(md_rdev_init); 3232 /* 3233 * Import a device. If 'super_format' >= 0, then sanity check the superblock 3234 * 3235 * mark the device faulty if: 3236 * 3237 * - the device is nonexistent (zero size) 3238 * - the device has no valid superblock 3239 * 3240 * a faulty rdev _never_ has rdev->sb set. 3241 */ 3242 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) 3243 { 3244 char b[BDEVNAME_SIZE]; 3245 int err; 3246 struct md_rdev *rdev; 3247 sector_t size; 3248 3249 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); 3250 if (!rdev) 3251 return ERR_PTR(-ENOMEM); 3252 3253 err = md_rdev_init(rdev); 3254 if (err) 3255 goto abort_free; 3256 err = alloc_disk_sb(rdev); 3257 if (err) 3258 goto abort_free; 3259 3260 err = lock_rdev(rdev, newdev, super_format == -2); 3261 if (err) 3262 goto abort_free; 3263 3264 kobject_init(&rdev->kobj, &rdev_ktype); 3265 3266 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; 3267 if (!size) { 3268 pr_warn("md: %s has zero or unknown size, marking faulty!\n", 3269 bdevname(rdev->bdev,b)); 3270 err = -EINVAL; 3271 goto abort_free; 3272 } 3273 3274 if (super_format >= 0) { 3275 err = super_types[super_format]. 3276 load_super(rdev, NULL, super_minor); 3277 if (err == -EINVAL) { 3278 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n", 3279 bdevname(rdev->bdev,b), 3280 super_format, super_minor); 3281 goto abort_free; 3282 } 3283 if (err < 0) { 3284 pr_warn("md: could not read %s's sb, not importing!\n", 3285 bdevname(rdev->bdev,b)); 3286 goto abort_free; 3287 } 3288 } 3289 3290 return rdev; 3291 3292 abort_free: 3293 if (rdev->bdev) 3294 unlock_rdev(rdev); 3295 md_rdev_clear(rdev); 3296 kfree(rdev); 3297 return ERR_PTR(err); 3298 } 3299 3300 /* 3301 * Check a full RAID array for plausibility 3302 */ 3303 3304 static void analyze_sbs(struct mddev *mddev) 3305 { 3306 int i; 3307 struct md_rdev *rdev, *freshest, *tmp; 3308 char b[BDEVNAME_SIZE]; 3309 3310 freshest = NULL; 3311 rdev_for_each_safe(rdev, tmp, mddev) 3312 switch (super_types[mddev->major_version]. 3313 load_super(rdev, freshest, mddev->minor_version)) { 3314 case 1: 3315 freshest = rdev; 3316 break; 3317 case 0: 3318 break; 3319 default: 3320 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n", 3321 bdevname(rdev->bdev,b)); 3322 md_kick_rdev_from_array(rdev); 3323 } 3324 3325 super_types[mddev->major_version]. 3326 validate_super(mddev, freshest); 3327 3328 i = 0; 3329 rdev_for_each_safe(rdev, tmp, mddev) { 3330 if (mddev->max_disks && 3331 (rdev->desc_nr >= mddev->max_disks || 3332 i > mddev->max_disks)) { 3333 pr_warn("md: %s: %s: only %d devices permitted\n", 3334 mdname(mddev), bdevname(rdev->bdev, b), 3335 mddev->max_disks); 3336 md_kick_rdev_from_array(rdev); 3337 continue; 3338 } 3339 if (rdev != freshest) { 3340 if (super_types[mddev->major_version]. 3341 validate_super(mddev, rdev)) { 3342 pr_warn("md: kicking non-fresh %s from array!\n", 3343 bdevname(rdev->bdev,b)); 3344 md_kick_rdev_from_array(rdev); 3345 continue; 3346 } 3347 } 3348 if (mddev->level == LEVEL_MULTIPATH) { 3349 rdev->desc_nr = i++; 3350 rdev->raid_disk = rdev->desc_nr; 3351 set_bit(In_sync, &rdev->flags); 3352 } else if (rdev->raid_disk >= 3353 (mddev->raid_disks - min(0, mddev->delta_disks)) && 3354 !test_bit(Journal, &rdev->flags)) { 3355 rdev->raid_disk = -1; 3356 clear_bit(In_sync, &rdev->flags); 3357 } 3358 } 3359 } 3360 3361 /* Read a fixed-point number. 3362 * Numbers in sysfs attributes should be in "standard" units where 3363 * possible, so time should be in seconds. 3364 * However we internally use a a much smaller unit such as 3365 * milliseconds or jiffies. 3366 * This function takes a decimal number with a possible fractional 3367 * component, and produces an integer which is the result of 3368 * multiplying that number by 10^'scale'. 3369 * all without any floating-point arithmetic. 3370 */ 3371 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) 3372 { 3373 unsigned long result = 0; 3374 long decimals = -1; 3375 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { 3376 if (*cp == '.') 3377 decimals = 0; 3378 else if (decimals < scale) { 3379 unsigned int value; 3380 value = *cp - '0'; 3381 result = result * 10 + value; 3382 if (decimals >= 0) 3383 decimals++; 3384 } 3385 cp++; 3386 } 3387 if (*cp == '\n') 3388 cp++; 3389 if (*cp) 3390 return -EINVAL; 3391 if (decimals < 0) 3392 decimals = 0; 3393 while (decimals < scale) { 3394 result *= 10; 3395 decimals ++; 3396 } 3397 *res = result; 3398 return 0; 3399 } 3400 3401 static ssize_t 3402 safe_delay_show(struct mddev *mddev, char *page) 3403 { 3404 int msec = (mddev->safemode_delay*1000)/HZ; 3405 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); 3406 } 3407 static ssize_t 3408 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) 3409 { 3410 unsigned long msec; 3411 3412 if (mddev_is_clustered(mddev)) { 3413 pr_warn("md: Safemode is disabled for clustered mode\n"); 3414 return -EINVAL; 3415 } 3416 3417 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) 3418 return -EINVAL; 3419 if (msec == 0) 3420 mddev->safemode_delay = 0; 3421 else { 3422 unsigned long old_delay = mddev->safemode_delay; 3423 unsigned long new_delay = (msec*HZ)/1000; 3424 3425 if (new_delay == 0) 3426 new_delay = 1; 3427 mddev->safemode_delay = new_delay; 3428 if (new_delay < old_delay || old_delay == 0) 3429 mod_timer(&mddev->safemode_timer, jiffies+1); 3430 } 3431 return len; 3432 } 3433 static struct md_sysfs_entry md_safe_delay = 3434 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); 3435 3436 static ssize_t 3437 level_show(struct mddev *mddev, char *page) 3438 { 3439 struct md_personality *p; 3440 int ret; 3441 spin_lock(&mddev->lock); 3442 p = mddev->pers; 3443 if (p) 3444 ret = sprintf(page, "%s\n", p->name); 3445 else if (mddev->clevel[0]) 3446 ret = sprintf(page, "%s\n", mddev->clevel); 3447 else if (mddev->level != LEVEL_NONE) 3448 ret = sprintf(page, "%d\n", mddev->level); 3449 else 3450 ret = 0; 3451 spin_unlock(&mddev->lock); 3452 return ret; 3453 } 3454 3455 static ssize_t 3456 level_store(struct mddev *mddev, const char *buf, size_t len) 3457 { 3458 char clevel[16]; 3459 ssize_t rv; 3460 size_t slen = len; 3461 struct md_personality *pers, *oldpers; 3462 long level; 3463 void *priv, *oldpriv; 3464 struct md_rdev *rdev; 3465 3466 if (slen == 0 || slen >= sizeof(clevel)) 3467 return -EINVAL; 3468 3469 rv = mddev_lock(mddev); 3470 if (rv) 3471 return rv; 3472 3473 if (mddev->pers == NULL) { 3474 strncpy(mddev->clevel, buf, slen); 3475 if (mddev->clevel[slen-1] == '\n') 3476 slen--; 3477 mddev->clevel[slen] = 0; 3478 mddev->level = LEVEL_NONE; 3479 rv = len; 3480 goto out_unlock; 3481 } 3482 rv = -EROFS; 3483 if (mddev->ro) 3484 goto out_unlock; 3485 3486 /* request to change the personality. Need to ensure: 3487 * - array is not engaged in resync/recovery/reshape 3488 * - old personality can be suspended 3489 * - new personality will access other array. 3490 */ 3491 3492 rv = -EBUSY; 3493 if (mddev->sync_thread || 3494 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 3495 mddev->reshape_position != MaxSector || 3496 mddev->sysfs_active) 3497 goto out_unlock; 3498 3499 rv = -EINVAL; 3500 if (!mddev->pers->quiesce) { 3501 pr_warn("md: %s: %s does not support online personality change\n", 3502 mdname(mddev), mddev->pers->name); 3503 goto out_unlock; 3504 } 3505 3506 /* Now find the new personality */ 3507 strncpy(clevel, buf, slen); 3508 if (clevel[slen-1] == '\n') 3509 slen--; 3510 clevel[slen] = 0; 3511 if (kstrtol(clevel, 10, &level)) 3512 level = LEVEL_NONE; 3513 3514 if (request_module("md-%s", clevel) != 0) 3515 request_module("md-level-%s", clevel); 3516 spin_lock(&pers_lock); 3517 pers = find_pers(level, clevel); 3518 if (!pers || !try_module_get(pers->owner)) { 3519 spin_unlock(&pers_lock); 3520 pr_warn("md: personality %s not loaded\n", clevel); 3521 rv = -EINVAL; 3522 goto out_unlock; 3523 } 3524 spin_unlock(&pers_lock); 3525 3526 if (pers == mddev->pers) { 3527 /* Nothing to do! */ 3528 module_put(pers->owner); 3529 rv = len; 3530 goto out_unlock; 3531 } 3532 if (!pers->takeover) { 3533 module_put(pers->owner); 3534 pr_warn("md: %s: %s does not support personality takeover\n", 3535 mdname(mddev), clevel); 3536 rv = -EINVAL; 3537 goto out_unlock; 3538 } 3539 3540 rdev_for_each(rdev, mddev) 3541 rdev->new_raid_disk = rdev->raid_disk; 3542 3543 /* ->takeover must set new_* and/or delta_disks 3544 * if it succeeds, and may set them when it fails. 3545 */ 3546 priv = pers->takeover(mddev); 3547 if (IS_ERR(priv)) { 3548 mddev->new_level = mddev->level; 3549 mddev->new_layout = mddev->layout; 3550 mddev->new_chunk_sectors = mddev->chunk_sectors; 3551 mddev->raid_disks -= mddev->delta_disks; 3552 mddev->delta_disks = 0; 3553 mddev->reshape_backwards = 0; 3554 module_put(pers->owner); 3555 pr_warn("md: %s: %s would not accept array\n", 3556 mdname(mddev), clevel); 3557 rv = PTR_ERR(priv); 3558 goto out_unlock; 3559 } 3560 3561 /* Looks like we have a winner */ 3562 mddev_suspend(mddev); 3563 mddev_detach(mddev); 3564 3565 spin_lock(&mddev->lock); 3566 oldpers = mddev->pers; 3567 oldpriv = mddev->private; 3568 mddev->pers = pers; 3569 mddev->private = priv; 3570 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 3571 mddev->level = mddev->new_level; 3572 mddev->layout = mddev->new_layout; 3573 mddev->chunk_sectors = mddev->new_chunk_sectors; 3574 mddev->delta_disks = 0; 3575 mddev->reshape_backwards = 0; 3576 mddev->degraded = 0; 3577 spin_unlock(&mddev->lock); 3578 3579 if (oldpers->sync_request == NULL && 3580 mddev->external) { 3581 /* We are converting from a no-redundancy array 3582 * to a redundancy array and metadata is managed 3583 * externally so we need to be sure that writes 3584 * won't block due to a need to transition 3585 * clean->dirty 3586 * until external management is started. 3587 */ 3588 mddev->in_sync = 0; 3589 mddev->safemode_delay = 0; 3590 mddev->safemode = 0; 3591 } 3592 3593 oldpers->free(mddev, oldpriv); 3594 3595 if (oldpers->sync_request == NULL && 3596 pers->sync_request != NULL) { 3597 /* need to add the md_redundancy_group */ 3598 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 3599 pr_warn("md: cannot register extra attributes for %s\n", 3600 mdname(mddev)); 3601 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); 3602 } 3603 if (oldpers->sync_request != NULL && 3604 pers->sync_request == NULL) { 3605 /* need to remove the md_redundancy_group */ 3606 if (mddev->to_remove == NULL) 3607 mddev->to_remove = &md_redundancy_group; 3608 } 3609 3610 module_put(oldpers->owner); 3611 3612 rdev_for_each(rdev, mddev) { 3613 if (rdev->raid_disk < 0) 3614 continue; 3615 if (rdev->new_raid_disk >= mddev->raid_disks) 3616 rdev->new_raid_disk = -1; 3617 if (rdev->new_raid_disk == rdev->raid_disk) 3618 continue; 3619 sysfs_unlink_rdev(mddev, rdev); 3620 } 3621 rdev_for_each(rdev, mddev) { 3622 if (rdev->raid_disk < 0) 3623 continue; 3624 if (rdev->new_raid_disk == rdev->raid_disk) 3625 continue; 3626 rdev->raid_disk = rdev->new_raid_disk; 3627 if (rdev->raid_disk < 0) 3628 clear_bit(In_sync, &rdev->flags); 3629 else { 3630 if (sysfs_link_rdev(mddev, rdev)) 3631 pr_warn("md: cannot register rd%d for %s after level change\n", 3632 rdev->raid_disk, mdname(mddev)); 3633 } 3634 } 3635 3636 if (pers->sync_request == NULL) { 3637 /* this is now an array without redundancy, so 3638 * it must always be in_sync 3639 */ 3640 mddev->in_sync = 1; 3641 del_timer_sync(&mddev->safemode_timer); 3642 } 3643 blk_set_stacking_limits(&mddev->queue->limits); 3644 pers->run(mddev); 3645 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 3646 mddev_resume(mddev); 3647 if (!mddev->thread) 3648 md_update_sb(mddev, 1); 3649 sysfs_notify(&mddev->kobj, NULL, "level"); 3650 md_new_event(mddev); 3651 rv = len; 3652 out_unlock: 3653 mddev_unlock(mddev); 3654 return rv; 3655 } 3656 3657 static struct md_sysfs_entry md_level = 3658 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); 3659 3660 static ssize_t 3661 layout_show(struct mddev *mddev, char *page) 3662 { 3663 /* just a number, not meaningful for all levels */ 3664 if (mddev->reshape_position != MaxSector && 3665 mddev->layout != mddev->new_layout) 3666 return sprintf(page, "%d (%d)\n", 3667 mddev->new_layout, mddev->layout); 3668 return sprintf(page, "%d\n", mddev->layout); 3669 } 3670 3671 static ssize_t 3672 layout_store(struct mddev *mddev, const char *buf, size_t len) 3673 { 3674 unsigned int n; 3675 int err; 3676 3677 err = kstrtouint(buf, 10, &n); 3678 if (err < 0) 3679 return err; 3680 err = mddev_lock(mddev); 3681 if (err) 3682 return err; 3683 3684 if (mddev->pers) { 3685 if (mddev->pers->check_reshape == NULL) 3686 err = -EBUSY; 3687 else if (mddev->ro) 3688 err = -EROFS; 3689 else { 3690 mddev->new_layout = n; 3691 err = mddev->pers->check_reshape(mddev); 3692 if (err) 3693 mddev->new_layout = mddev->layout; 3694 } 3695 } else { 3696 mddev->new_layout = n; 3697 if (mddev->reshape_position == MaxSector) 3698 mddev->layout = n; 3699 } 3700 mddev_unlock(mddev); 3701 return err ?: len; 3702 } 3703 static struct md_sysfs_entry md_layout = 3704 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); 3705 3706 static ssize_t 3707 raid_disks_show(struct mddev *mddev, char *page) 3708 { 3709 if (mddev->raid_disks == 0) 3710 return 0; 3711 if (mddev->reshape_position != MaxSector && 3712 mddev->delta_disks != 0) 3713 return sprintf(page, "%d (%d)\n", mddev->raid_disks, 3714 mddev->raid_disks - mddev->delta_disks); 3715 return sprintf(page, "%d\n", mddev->raid_disks); 3716 } 3717 3718 static int update_raid_disks(struct mddev *mddev, int raid_disks); 3719 3720 static ssize_t 3721 raid_disks_store(struct mddev *mddev, const char *buf, size_t len) 3722 { 3723 unsigned int n; 3724 int err; 3725 3726 err = kstrtouint(buf, 10, &n); 3727 if (err < 0) 3728 return err; 3729 3730 err = mddev_lock(mddev); 3731 if (err) 3732 return err; 3733 if (mddev->pers) 3734 err = update_raid_disks(mddev, n); 3735 else if (mddev->reshape_position != MaxSector) { 3736 struct md_rdev *rdev; 3737 int olddisks = mddev->raid_disks - mddev->delta_disks; 3738 3739 err = -EINVAL; 3740 rdev_for_each(rdev, mddev) { 3741 if (olddisks < n && 3742 rdev->data_offset < rdev->new_data_offset) 3743 goto out_unlock; 3744 if (olddisks > n && 3745 rdev->data_offset > rdev->new_data_offset) 3746 goto out_unlock; 3747 } 3748 err = 0; 3749 mddev->delta_disks = n - olddisks; 3750 mddev->raid_disks = n; 3751 mddev->reshape_backwards = (mddev->delta_disks < 0); 3752 } else 3753 mddev->raid_disks = n; 3754 out_unlock: 3755 mddev_unlock(mddev); 3756 return err ? err : len; 3757 } 3758 static struct md_sysfs_entry md_raid_disks = 3759 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); 3760 3761 static ssize_t 3762 chunk_size_show(struct mddev *mddev, char *page) 3763 { 3764 if (mddev->reshape_position != MaxSector && 3765 mddev->chunk_sectors != mddev->new_chunk_sectors) 3766 return sprintf(page, "%d (%d)\n", 3767 mddev->new_chunk_sectors << 9, 3768 mddev->chunk_sectors << 9); 3769 return sprintf(page, "%d\n", mddev->chunk_sectors << 9); 3770 } 3771 3772 static ssize_t 3773 chunk_size_store(struct mddev *mddev, const char *buf, size_t len) 3774 { 3775 unsigned long n; 3776 int err; 3777 3778 err = kstrtoul(buf, 10, &n); 3779 if (err < 0) 3780 return err; 3781 3782 err = mddev_lock(mddev); 3783 if (err) 3784 return err; 3785 if (mddev->pers) { 3786 if (mddev->pers->check_reshape == NULL) 3787 err = -EBUSY; 3788 else if (mddev->ro) 3789 err = -EROFS; 3790 else { 3791 mddev->new_chunk_sectors = n >> 9; 3792 err = mddev->pers->check_reshape(mddev); 3793 if (err) 3794 mddev->new_chunk_sectors = mddev->chunk_sectors; 3795 } 3796 } else { 3797 mddev->new_chunk_sectors = n >> 9; 3798 if (mddev->reshape_position == MaxSector) 3799 mddev->chunk_sectors = n >> 9; 3800 } 3801 mddev_unlock(mddev); 3802 return err ?: len; 3803 } 3804 static struct md_sysfs_entry md_chunk_size = 3805 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); 3806 3807 static ssize_t 3808 resync_start_show(struct mddev *mddev, char *page) 3809 { 3810 if (mddev->recovery_cp == MaxSector) 3811 return sprintf(page, "none\n"); 3812 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); 3813 } 3814 3815 static ssize_t 3816 resync_start_store(struct mddev *mddev, const char *buf, size_t len) 3817 { 3818 unsigned long long n; 3819 int err; 3820 3821 if (cmd_match(buf, "none")) 3822 n = MaxSector; 3823 else { 3824 err = kstrtoull(buf, 10, &n); 3825 if (err < 0) 3826 return err; 3827 if (n != (sector_t)n) 3828 return -EINVAL; 3829 } 3830 3831 err = mddev_lock(mddev); 3832 if (err) 3833 return err; 3834 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 3835 err = -EBUSY; 3836 3837 if (!err) { 3838 mddev->recovery_cp = n; 3839 if (mddev->pers) 3840 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 3841 } 3842 mddev_unlock(mddev); 3843 return err ?: len; 3844 } 3845 static struct md_sysfs_entry md_resync_start = 3846 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, 3847 resync_start_show, resync_start_store); 3848 3849 /* 3850 * The array state can be: 3851 * 3852 * clear 3853 * No devices, no size, no level 3854 * Equivalent to STOP_ARRAY ioctl 3855 * inactive 3856 * May have some settings, but array is not active 3857 * all IO results in error 3858 * When written, doesn't tear down array, but just stops it 3859 * suspended (not supported yet) 3860 * All IO requests will block. The array can be reconfigured. 3861 * Writing this, if accepted, will block until array is quiescent 3862 * readonly 3863 * no resync can happen. no superblocks get written. 3864 * write requests fail 3865 * read-auto 3866 * like readonly, but behaves like 'clean' on a write request. 3867 * 3868 * clean - no pending writes, but otherwise active. 3869 * When written to inactive array, starts without resync 3870 * If a write request arrives then 3871 * if metadata is known, mark 'dirty' and switch to 'active'. 3872 * if not known, block and switch to write-pending 3873 * If written to an active array that has pending writes, then fails. 3874 * active 3875 * fully active: IO and resync can be happening. 3876 * When written to inactive array, starts with resync 3877 * 3878 * write-pending 3879 * clean, but writes are blocked waiting for 'active' to be written. 3880 * 3881 * active-idle 3882 * like active, but no writes have been seen for a while (100msec). 3883 * 3884 */ 3885 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, 3886 write_pending, active_idle, bad_word}; 3887 static char *array_states[] = { 3888 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", 3889 "write-pending", "active-idle", NULL }; 3890 3891 static int match_word(const char *word, char **list) 3892 { 3893 int n; 3894 for (n=0; list[n]; n++) 3895 if (cmd_match(word, list[n])) 3896 break; 3897 return n; 3898 } 3899 3900 static ssize_t 3901 array_state_show(struct mddev *mddev, char *page) 3902 { 3903 enum array_state st = inactive; 3904 3905 if (mddev->pers) 3906 switch(mddev->ro) { 3907 case 1: 3908 st = readonly; 3909 break; 3910 case 2: 3911 st = read_auto; 3912 break; 3913 case 0: 3914 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 3915 st = write_pending; 3916 else if (mddev->in_sync) 3917 st = clean; 3918 else if (mddev->safemode) 3919 st = active_idle; 3920 else 3921 st = active; 3922 } 3923 else { 3924 if (list_empty(&mddev->disks) && 3925 mddev->raid_disks == 0 && 3926 mddev->dev_sectors == 0) 3927 st = clear; 3928 else 3929 st = inactive; 3930 } 3931 return sprintf(page, "%s\n", array_states[st]); 3932 } 3933 3934 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); 3935 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); 3936 static int do_md_run(struct mddev *mddev); 3937 static int restart_array(struct mddev *mddev); 3938 3939 static ssize_t 3940 array_state_store(struct mddev *mddev, const char *buf, size_t len) 3941 { 3942 int err; 3943 enum array_state st = match_word(buf, array_states); 3944 3945 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { 3946 /* don't take reconfig_mutex when toggling between 3947 * clean and active 3948 */ 3949 spin_lock(&mddev->lock); 3950 if (st == active) { 3951 restart_array(mddev); 3952 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 3953 md_wakeup_thread(mddev->thread); 3954 wake_up(&mddev->sb_wait); 3955 err = 0; 3956 } else /* st == clean */ { 3957 restart_array(mddev); 3958 if (atomic_read(&mddev->writes_pending) == 0) { 3959 if (mddev->in_sync == 0) { 3960 mddev->in_sync = 1; 3961 if (mddev->safemode == 1) 3962 mddev->safemode = 0; 3963 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 3964 } 3965 err = 0; 3966 } else 3967 err = -EBUSY; 3968 } 3969 if (!err) 3970 sysfs_notify_dirent_safe(mddev->sysfs_state); 3971 spin_unlock(&mddev->lock); 3972 return err ?: len; 3973 } 3974 err = mddev_lock(mddev); 3975 if (err) 3976 return err; 3977 err = -EINVAL; 3978 switch(st) { 3979 case bad_word: 3980 break; 3981 case clear: 3982 /* stopping an active array */ 3983 err = do_md_stop(mddev, 0, NULL); 3984 break; 3985 case inactive: 3986 /* stopping an active array */ 3987 if (mddev->pers) 3988 err = do_md_stop(mddev, 2, NULL); 3989 else 3990 err = 0; /* already inactive */ 3991 break; 3992 case suspended: 3993 break; /* not supported yet */ 3994 case readonly: 3995 if (mddev->pers) 3996 err = md_set_readonly(mddev, NULL); 3997 else { 3998 mddev->ro = 1; 3999 set_disk_ro(mddev->gendisk, 1); 4000 err = do_md_run(mddev); 4001 } 4002 break; 4003 case read_auto: 4004 if (mddev->pers) { 4005 if (mddev->ro == 0) 4006 err = md_set_readonly(mddev, NULL); 4007 else if (mddev->ro == 1) 4008 err = restart_array(mddev); 4009 if (err == 0) { 4010 mddev->ro = 2; 4011 set_disk_ro(mddev->gendisk, 0); 4012 } 4013 } else { 4014 mddev->ro = 2; 4015 err = do_md_run(mddev); 4016 } 4017 break; 4018 case clean: 4019 if (mddev->pers) { 4020 err = restart_array(mddev); 4021 if (err) 4022 break; 4023 spin_lock(&mddev->lock); 4024 if (atomic_read(&mddev->writes_pending) == 0) { 4025 if (mddev->in_sync == 0) { 4026 mddev->in_sync = 1; 4027 if (mddev->safemode == 1) 4028 mddev->safemode = 0; 4029 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 4030 } 4031 err = 0; 4032 } else 4033 err = -EBUSY; 4034 spin_unlock(&mddev->lock); 4035 } else 4036 err = -EINVAL; 4037 break; 4038 case active: 4039 if (mddev->pers) { 4040 err = restart_array(mddev); 4041 if (err) 4042 break; 4043 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 4044 wake_up(&mddev->sb_wait); 4045 err = 0; 4046 } else { 4047 mddev->ro = 0; 4048 set_disk_ro(mddev->gendisk, 0); 4049 err = do_md_run(mddev); 4050 } 4051 break; 4052 case write_pending: 4053 case active_idle: 4054 /* these cannot be set */ 4055 break; 4056 } 4057 4058 if (!err) { 4059 if (mddev->hold_active == UNTIL_IOCTL) 4060 mddev->hold_active = 0; 4061 sysfs_notify_dirent_safe(mddev->sysfs_state); 4062 } 4063 mddev_unlock(mddev); 4064 return err ?: len; 4065 } 4066 static struct md_sysfs_entry md_array_state = 4067 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); 4068 4069 static ssize_t 4070 max_corrected_read_errors_show(struct mddev *mddev, char *page) { 4071 return sprintf(page, "%d\n", 4072 atomic_read(&mddev->max_corr_read_errors)); 4073 } 4074 4075 static ssize_t 4076 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) 4077 { 4078 unsigned int n; 4079 int rv; 4080 4081 rv = kstrtouint(buf, 10, &n); 4082 if (rv < 0) 4083 return rv; 4084 atomic_set(&mddev->max_corr_read_errors, n); 4085 return len; 4086 } 4087 4088 static struct md_sysfs_entry max_corr_read_errors = 4089 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, 4090 max_corrected_read_errors_store); 4091 4092 static ssize_t 4093 null_show(struct mddev *mddev, char *page) 4094 { 4095 return -EINVAL; 4096 } 4097 4098 static ssize_t 4099 new_dev_store(struct mddev *mddev, const char *buf, size_t len) 4100 { 4101 /* buf must be %d:%d\n? giving major and minor numbers */ 4102 /* The new device is added to the array. 4103 * If the array has a persistent superblock, we read the 4104 * superblock to initialise info and check validity. 4105 * Otherwise, only checking done is that in bind_rdev_to_array, 4106 * which mainly checks size. 4107 */ 4108 char *e; 4109 int major = simple_strtoul(buf, &e, 10); 4110 int minor; 4111 dev_t dev; 4112 struct md_rdev *rdev; 4113 int err; 4114 4115 if (!*buf || *e != ':' || !e[1] || e[1] == '\n') 4116 return -EINVAL; 4117 minor = simple_strtoul(e+1, &e, 10); 4118 if (*e && *e != '\n') 4119 return -EINVAL; 4120 dev = MKDEV(major, minor); 4121 if (major != MAJOR(dev) || 4122 minor != MINOR(dev)) 4123 return -EOVERFLOW; 4124 4125 flush_workqueue(md_misc_wq); 4126 4127 err = mddev_lock(mddev); 4128 if (err) 4129 return err; 4130 if (mddev->persistent) { 4131 rdev = md_import_device(dev, mddev->major_version, 4132 mddev->minor_version); 4133 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { 4134 struct md_rdev *rdev0 4135 = list_entry(mddev->disks.next, 4136 struct md_rdev, same_set); 4137 err = super_types[mddev->major_version] 4138 .load_super(rdev, rdev0, mddev->minor_version); 4139 if (err < 0) 4140 goto out; 4141 } 4142 } else if (mddev->external) 4143 rdev = md_import_device(dev, -2, -1); 4144 else 4145 rdev = md_import_device(dev, -1, -1); 4146 4147 if (IS_ERR(rdev)) { 4148 mddev_unlock(mddev); 4149 return PTR_ERR(rdev); 4150 } 4151 err = bind_rdev_to_array(rdev, mddev); 4152 out: 4153 if (err) 4154 export_rdev(rdev); 4155 mddev_unlock(mddev); 4156 return err ? err : len; 4157 } 4158 4159 static struct md_sysfs_entry md_new_device = 4160 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); 4161 4162 static ssize_t 4163 bitmap_store(struct mddev *mddev, const char *buf, size_t len) 4164 { 4165 char *end; 4166 unsigned long chunk, end_chunk; 4167 int err; 4168 4169 err = mddev_lock(mddev); 4170 if (err) 4171 return err; 4172 if (!mddev->bitmap) 4173 goto out; 4174 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ 4175 while (*buf) { 4176 chunk = end_chunk = simple_strtoul(buf, &end, 0); 4177 if (buf == end) break; 4178 if (*end == '-') { /* range */ 4179 buf = end + 1; 4180 end_chunk = simple_strtoul(buf, &end, 0); 4181 if (buf == end) break; 4182 } 4183 if (*end && !isspace(*end)) break; 4184 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); 4185 buf = skip_spaces(end); 4186 } 4187 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ 4188 out: 4189 mddev_unlock(mddev); 4190 return len; 4191 } 4192 4193 static struct md_sysfs_entry md_bitmap = 4194 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); 4195 4196 static ssize_t 4197 size_show(struct mddev *mddev, char *page) 4198 { 4199 return sprintf(page, "%llu\n", 4200 (unsigned long long)mddev->dev_sectors / 2); 4201 } 4202 4203 static int update_size(struct mddev *mddev, sector_t num_sectors); 4204 4205 static ssize_t 4206 size_store(struct mddev *mddev, const char *buf, size_t len) 4207 { 4208 /* If array is inactive, we can reduce the component size, but 4209 * not increase it (except from 0). 4210 * If array is active, we can try an on-line resize 4211 */ 4212 sector_t sectors; 4213 int err = strict_blocks_to_sectors(buf, §ors); 4214 4215 if (err < 0) 4216 return err; 4217 err = mddev_lock(mddev); 4218 if (err) 4219 return err; 4220 if (mddev->pers) { 4221 err = update_size(mddev, sectors); 4222 if (err == 0) 4223 md_update_sb(mddev, 1); 4224 } else { 4225 if (mddev->dev_sectors == 0 || 4226 mddev->dev_sectors > sectors) 4227 mddev->dev_sectors = sectors; 4228 else 4229 err = -ENOSPC; 4230 } 4231 mddev_unlock(mddev); 4232 return err ? err : len; 4233 } 4234 4235 static struct md_sysfs_entry md_size = 4236 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); 4237 4238 /* Metadata version. 4239 * This is one of 4240 * 'none' for arrays with no metadata (good luck...) 4241 * 'external' for arrays with externally managed metadata, 4242 * or N.M for internally known formats 4243 */ 4244 static ssize_t 4245 metadata_show(struct mddev *mddev, char *page) 4246 { 4247 if (mddev->persistent) 4248 return sprintf(page, "%d.%d\n", 4249 mddev->major_version, mddev->minor_version); 4250 else if (mddev->external) 4251 return sprintf(page, "external:%s\n", mddev->metadata_type); 4252 else 4253 return sprintf(page, "none\n"); 4254 } 4255 4256 static ssize_t 4257 metadata_store(struct mddev *mddev, const char *buf, size_t len) 4258 { 4259 int major, minor; 4260 char *e; 4261 int err; 4262 /* Changing the details of 'external' metadata is 4263 * always permitted. Otherwise there must be 4264 * no devices attached to the array. 4265 */ 4266 4267 err = mddev_lock(mddev); 4268 if (err) 4269 return err; 4270 err = -EBUSY; 4271 if (mddev->external && strncmp(buf, "external:", 9) == 0) 4272 ; 4273 else if (!list_empty(&mddev->disks)) 4274 goto out_unlock; 4275 4276 err = 0; 4277 if (cmd_match(buf, "none")) { 4278 mddev->persistent = 0; 4279 mddev->external = 0; 4280 mddev->major_version = 0; 4281 mddev->minor_version = 90; 4282 goto out_unlock; 4283 } 4284 if (strncmp(buf, "external:", 9) == 0) { 4285 size_t namelen = len-9; 4286 if (namelen >= sizeof(mddev->metadata_type)) 4287 namelen = sizeof(mddev->metadata_type)-1; 4288 strncpy(mddev->metadata_type, buf+9, namelen); 4289 mddev->metadata_type[namelen] = 0; 4290 if (namelen && mddev->metadata_type[namelen-1] == '\n') 4291 mddev->metadata_type[--namelen] = 0; 4292 mddev->persistent = 0; 4293 mddev->external = 1; 4294 mddev->major_version = 0; 4295 mddev->minor_version = 90; 4296 goto out_unlock; 4297 } 4298 major = simple_strtoul(buf, &e, 10); 4299 err = -EINVAL; 4300 if (e==buf || *e != '.') 4301 goto out_unlock; 4302 buf = e+1; 4303 minor = simple_strtoul(buf, &e, 10); 4304 if (e==buf || (*e && *e != '\n') ) 4305 goto out_unlock; 4306 err = -ENOENT; 4307 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) 4308 goto out_unlock; 4309 mddev->major_version = major; 4310 mddev->minor_version = minor; 4311 mddev->persistent = 1; 4312 mddev->external = 0; 4313 err = 0; 4314 out_unlock: 4315 mddev_unlock(mddev); 4316 return err ?: len; 4317 } 4318 4319 static struct md_sysfs_entry md_metadata = 4320 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); 4321 4322 static ssize_t 4323 action_show(struct mddev *mddev, char *page) 4324 { 4325 char *type = "idle"; 4326 unsigned long recovery = mddev->recovery; 4327 if (test_bit(MD_RECOVERY_FROZEN, &recovery)) 4328 type = "frozen"; 4329 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || 4330 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { 4331 if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) 4332 type = "reshape"; 4333 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { 4334 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) 4335 type = "resync"; 4336 else if (test_bit(MD_RECOVERY_CHECK, &recovery)) 4337 type = "check"; 4338 else 4339 type = "repair"; 4340 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) 4341 type = "recover"; 4342 else if (mddev->reshape_position != MaxSector) 4343 type = "reshape"; 4344 } 4345 return sprintf(page, "%s\n", type); 4346 } 4347 4348 static ssize_t 4349 action_store(struct mddev *mddev, const char *page, size_t len) 4350 { 4351 if (!mddev->pers || !mddev->pers->sync_request) 4352 return -EINVAL; 4353 4354 4355 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { 4356 if (cmd_match(page, "frozen")) 4357 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4358 else 4359 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4360 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 4361 mddev_lock(mddev) == 0) { 4362 flush_workqueue(md_misc_wq); 4363 if (mddev->sync_thread) { 4364 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4365 md_reap_sync_thread(mddev); 4366 } 4367 mddev_unlock(mddev); 4368 } 4369 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4370 return -EBUSY; 4371 else if (cmd_match(page, "resync")) 4372 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4373 else if (cmd_match(page, "recover")) { 4374 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4375 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 4376 } else if (cmd_match(page, "reshape")) { 4377 int err; 4378 if (mddev->pers->start_reshape == NULL) 4379 return -EINVAL; 4380 err = mddev_lock(mddev); 4381 if (!err) { 4382 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4383 err = -EBUSY; 4384 else { 4385 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4386 err = mddev->pers->start_reshape(mddev); 4387 } 4388 mddev_unlock(mddev); 4389 } 4390 if (err) 4391 return err; 4392 sysfs_notify(&mddev->kobj, NULL, "degraded"); 4393 } else { 4394 if (cmd_match(page, "check")) 4395 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4396 else if (!cmd_match(page, "repair")) 4397 return -EINVAL; 4398 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4399 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 4400 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4401 } 4402 if (mddev->ro == 2) { 4403 /* A write to sync_action is enough to justify 4404 * canceling read-auto mode 4405 */ 4406 mddev->ro = 0; 4407 md_wakeup_thread(mddev->sync_thread); 4408 } 4409 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4410 md_wakeup_thread(mddev->thread); 4411 sysfs_notify_dirent_safe(mddev->sysfs_action); 4412 return len; 4413 } 4414 4415 static struct md_sysfs_entry md_scan_mode = 4416 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 4417 4418 static ssize_t 4419 last_sync_action_show(struct mddev *mddev, char *page) 4420 { 4421 return sprintf(page, "%s\n", mddev->last_sync_action); 4422 } 4423 4424 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); 4425 4426 static ssize_t 4427 mismatch_cnt_show(struct mddev *mddev, char *page) 4428 { 4429 return sprintf(page, "%llu\n", 4430 (unsigned long long) 4431 atomic64_read(&mddev->resync_mismatches)); 4432 } 4433 4434 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); 4435 4436 static ssize_t 4437 sync_min_show(struct mddev *mddev, char *page) 4438 { 4439 return sprintf(page, "%d (%s)\n", speed_min(mddev), 4440 mddev->sync_speed_min ? "local": "system"); 4441 } 4442 4443 static ssize_t 4444 sync_min_store(struct mddev *mddev, const char *buf, size_t len) 4445 { 4446 unsigned int min; 4447 int rv; 4448 4449 if (strncmp(buf, "system", 6)==0) { 4450 min = 0; 4451 } else { 4452 rv = kstrtouint(buf, 10, &min); 4453 if (rv < 0) 4454 return rv; 4455 if (min == 0) 4456 return -EINVAL; 4457 } 4458 mddev->sync_speed_min = min; 4459 return len; 4460 } 4461 4462 static struct md_sysfs_entry md_sync_min = 4463 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); 4464 4465 static ssize_t 4466 sync_max_show(struct mddev *mddev, char *page) 4467 { 4468 return sprintf(page, "%d (%s)\n", speed_max(mddev), 4469 mddev->sync_speed_max ? "local": "system"); 4470 } 4471 4472 static ssize_t 4473 sync_max_store(struct mddev *mddev, const char *buf, size_t len) 4474 { 4475 unsigned int max; 4476 int rv; 4477 4478 if (strncmp(buf, "system", 6)==0) { 4479 max = 0; 4480 } else { 4481 rv = kstrtouint(buf, 10, &max); 4482 if (rv < 0) 4483 return rv; 4484 if (max == 0) 4485 return -EINVAL; 4486 } 4487 mddev->sync_speed_max = max; 4488 return len; 4489 } 4490 4491 static struct md_sysfs_entry md_sync_max = 4492 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); 4493 4494 static ssize_t 4495 degraded_show(struct mddev *mddev, char *page) 4496 { 4497 return sprintf(page, "%d\n", mddev->degraded); 4498 } 4499 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); 4500 4501 static ssize_t 4502 sync_force_parallel_show(struct mddev *mddev, char *page) 4503 { 4504 return sprintf(page, "%d\n", mddev->parallel_resync); 4505 } 4506 4507 static ssize_t 4508 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) 4509 { 4510 long n; 4511 4512 if (kstrtol(buf, 10, &n)) 4513 return -EINVAL; 4514 4515 if (n != 0 && n != 1) 4516 return -EINVAL; 4517 4518 mddev->parallel_resync = n; 4519 4520 if (mddev->sync_thread) 4521 wake_up(&resync_wait); 4522 4523 return len; 4524 } 4525 4526 /* force parallel resync, even with shared block devices */ 4527 static struct md_sysfs_entry md_sync_force_parallel = 4528 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, 4529 sync_force_parallel_show, sync_force_parallel_store); 4530 4531 static ssize_t 4532 sync_speed_show(struct mddev *mddev, char *page) 4533 { 4534 unsigned long resync, dt, db; 4535 if (mddev->curr_resync == 0) 4536 return sprintf(page, "none\n"); 4537 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); 4538 dt = (jiffies - mddev->resync_mark) / HZ; 4539 if (!dt) dt++; 4540 db = resync - mddev->resync_mark_cnt; 4541 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ 4542 } 4543 4544 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); 4545 4546 static ssize_t 4547 sync_completed_show(struct mddev *mddev, char *page) 4548 { 4549 unsigned long long max_sectors, resync; 4550 4551 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4552 return sprintf(page, "none\n"); 4553 4554 if (mddev->curr_resync == 1 || 4555 mddev->curr_resync == 2) 4556 return sprintf(page, "delayed\n"); 4557 4558 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 4559 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 4560 max_sectors = mddev->resync_max_sectors; 4561 else 4562 max_sectors = mddev->dev_sectors; 4563 4564 resync = mddev->curr_resync_completed; 4565 return sprintf(page, "%llu / %llu\n", resync, max_sectors); 4566 } 4567 4568 static struct md_sysfs_entry md_sync_completed = 4569 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); 4570 4571 static ssize_t 4572 min_sync_show(struct mddev *mddev, char *page) 4573 { 4574 return sprintf(page, "%llu\n", 4575 (unsigned long long)mddev->resync_min); 4576 } 4577 static ssize_t 4578 min_sync_store(struct mddev *mddev, const char *buf, size_t len) 4579 { 4580 unsigned long long min; 4581 int err; 4582 4583 if (kstrtoull(buf, 10, &min)) 4584 return -EINVAL; 4585 4586 spin_lock(&mddev->lock); 4587 err = -EINVAL; 4588 if (min > mddev->resync_max) 4589 goto out_unlock; 4590 4591 err = -EBUSY; 4592 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4593 goto out_unlock; 4594 4595 /* Round down to multiple of 4K for safety */ 4596 mddev->resync_min = round_down(min, 8); 4597 err = 0; 4598 4599 out_unlock: 4600 spin_unlock(&mddev->lock); 4601 return err ?: len; 4602 } 4603 4604 static struct md_sysfs_entry md_min_sync = 4605 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); 4606 4607 static ssize_t 4608 max_sync_show(struct mddev *mddev, char *page) 4609 { 4610 if (mddev->resync_max == MaxSector) 4611 return sprintf(page, "max\n"); 4612 else 4613 return sprintf(page, "%llu\n", 4614 (unsigned long long)mddev->resync_max); 4615 } 4616 static ssize_t 4617 max_sync_store(struct mddev *mddev, const char *buf, size_t len) 4618 { 4619 int err; 4620 spin_lock(&mddev->lock); 4621 if (strncmp(buf, "max", 3) == 0) 4622 mddev->resync_max = MaxSector; 4623 else { 4624 unsigned long long max; 4625 int chunk; 4626 4627 err = -EINVAL; 4628 if (kstrtoull(buf, 10, &max)) 4629 goto out_unlock; 4630 if (max < mddev->resync_min) 4631 goto out_unlock; 4632 4633 err = -EBUSY; 4634 if (max < mddev->resync_max && 4635 mddev->ro == 0 && 4636 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4637 goto out_unlock; 4638 4639 /* Must be a multiple of chunk_size */ 4640 chunk = mddev->chunk_sectors; 4641 if (chunk) { 4642 sector_t temp = max; 4643 4644 err = -EINVAL; 4645 if (sector_div(temp, chunk)) 4646 goto out_unlock; 4647 } 4648 mddev->resync_max = max; 4649 } 4650 wake_up(&mddev->recovery_wait); 4651 err = 0; 4652 out_unlock: 4653 spin_unlock(&mddev->lock); 4654 return err ?: len; 4655 } 4656 4657 static struct md_sysfs_entry md_max_sync = 4658 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); 4659 4660 static ssize_t 4661 suspend_lo_show(struct mddev *mddev, char *page) 4662 { 4663 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); 4664 } 4665 4666 static ssize_t 4667 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) 4668 { 4669 unsigned long long old, new; 4670 int err; 4671 4672 err = kstrtoull(buf, 10, &new); 4673 if (err < 0) 4674 return err; 4675 if (new != (sector_t)new) 4676 return -EINVAL; 4677 4678 err = mddev_lock(mddev); 4679 if (err) 4680 return err; 4681 err = -EINVAL; 4682 if (mddev->pers == NULL || 4683 mddev->pers->quiesce == NULL) 4684 goto unlock; 4685 old = mddev->suspend_lo; 4686 mddev->suspend_lo = new; 4687 if (new >= old) 4688 /* Shrinking suspended region */ 4689 mddev->pers->quiesce(mddev, 2); 4690 else { 4691 /* Expanding suspended region - need to wait */ 4692 mddev->pers->quiesce(mddev, 1); 4693 mddev->pers->quiesce(mddev, 0); 4694 } 4695 err = 0; 4696 unlock: 4697 mddev_unlock(mddev); 4698 return err ?: len; 4699 } 4700 static struct md_sysfs_entry md_suspend_lo = 4701 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); 4702 4703 static ssize_t 4704 suspend_hi_show(struct mddev *mddev, char *page) 4705 { 4706 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); 4707 } 4708 4709 static ssize_t 4710 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) 4711 { 4712 unsigned long long old, new; 4713 int err; 4714 4715 err = kstrtoull(buf, 10, &new); 4716 if (err < 0) 4717 return err; 4718 if (new != (sector_t)new) 4719 return -EINVAL; 4720 4721 err = mddev_lock(mddev); 4722 if (err) 4723 return err; 4724 err = -EINVAL; 4725 if (mddev->pers == NULL || 4726 mddev->pers->quiesce == NULL) 4727 goto unlock; 4728 old = mddev->suspend_hi; 4729 mddev->suspend_hi = new; 4730 if (new <= old) 4731 /* Shrinking suspended region */ 4732 mddev->pers->quiesce(mddev, 2); 4733 else { 4734 /* Expanding suspended region - need to wait */ 4735 mddev->pers->quiesce(mddev, 1); 4736 mddev->pers->quiesce(mddev, 0); 4737 } 4738 err = 0; 4739 unlock: 4740 mddev_unlock(mddev); 4741 return err ?: len; 4742 } 4743 static struct md_sysfs_entry md_suspend_hi = 4744 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); 4745 4746 static ssize_t 4747 reshape_position_show(struct mddev *mddev, char *page) 4748 { 4749 if (mddev->reshape_position != MaxSector) 4750 return sprintf(page, "%llu\n", 4751 (unsigned long long)mddev->reshape_position); 4752 strcpy(page, "none\n"); 4753 return 5; 4754 } 4755 4756 static ssize_t 4757 reshape_position_store(struct mddev *mddev, const char *buf, size_t len) 4758 { 4759 struct md_rdev *rdev; 4760 unsigned long long new; 4761 int err; 4762 4763 err = kstrtoull(buf, 10, &new); 4764 if (err < 0) 4765 return err; 4766 if (new != (sector_t)new) 4767 return -EINVAL; 4768 err = mddev_lock(mddev); 4769 if (err) 4770 return err; 4771 err = -EBUSY; 4772 if (mddev->pers) 4773 goto unlock; 4774 mddev->reshape_position = new; 4775 mddev->delta_disks = 0; 4776 mddev->reshape_backwards = 0; 4777 mddev->new_level = mddev->level; 4778 mddev->new_layout = mddev->layout; 4779 mddev->new_chunk_sectors = mddev->chunk_sectors; 4780 rdev_for_each(rdev, mddev) 4781 rdev->new_data_offset = rdev->data_offset; 4782 err = 0; 4783 unlock: 4784 mddev_unlock(mddev); 4785 return err ?: len; 4786 } 4787 4788 static struct md_sysfs_entry md_reshape_position = 4789 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, 4790 reshape_position_store); 4791 4792 static ssize_t 4793 reshape_direction_show(struct mddev *mddev, char *page) 4794 { 4795 return sprintf(page, "%s\n", 4796 mddev->reshape_backwards ? "backwards" : "forwards"); 4797 } 4798 4799 static ssize_t 4800 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) 4801 { 4802 int backwards = 0; 4803 int err; 4804 4805 if (cmd_match(buf, "forwards")) 4806 backwards = 0; 4807 else if (cmd_match(buf, "backwards")) 4808 backwards = 1; 4809 else 4810 return -EINVAL; 4811 if (mddev->reshape_backwards == backwards) 4812 return len; 4813 4814 err = mddev_lock(mddev); 4815 if (err) 4816 return err; 4817 /* check if we are allowed to change */ 4818 if (mddev->delta_disks) 4819 err = -EBUSY; 4820 else if (mddev->persistent && 4821 mddev->major_version == 0) 4822 err = -EINVAL; 4823 else 4824 mddev->reshape_backwards = backwards; 4825 mddev_unlock(mddev); 4826 return err ?: len; 4827 } 4828 4829 static struct md_sysfs_entry md_reshape_direction = 4830 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, 4831 reshape_direction_store); 4832 4833 static ssize_t 4834 array_size_show(struct mddev *mddev, char *page) 4835 { 4836 if (mddev->external_size) 4837 return sprintf(page, "%llu\n", 4838 (unsigned long long)mddev->array_sectors/2); 4839 else 4840 return sprintf(page, "default\n"); 4841 } 4842 4843 static ssize_t 4844 array_size_store(struct mddev *mddev, const char *buf, size_t len) 4845 { 4846 sector_t sectors; 4847 int err; 4848 4849 err = mddev_lock(mddev); 4850 if (err) 4851 return err; 4852 4853 /* cluster raid doesn't support change array_sectors */ 4854 if (mddev_is_clustered(mddev)) 4855 return -EINVAL; 4856 4857 if (strncmp(buf, "default", 7) == 0) { 4858 if (mddev->pers) 4859 sectors = mddev->pers->size(mddev, 0, 0); 4860 else 4861 sectors = mddev->array_sectors; 4862 4863 mddev->external_size = 0; 4864 } else { 4865 if (strict_blocks_to_sectors(buf, §ors) < 0) 4866 err = -EINVAL; 4867 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) 4868 err = -E2BIG; 4869 else 4870 mddev->external_size = 1; 4871 } 4872 4873 if (!err) { 4874 mddev->array_sectors = sectors; 4875 if (mddev->pers) { 4876 set_capacity(mddev->gendisk, mddev->array_sectors); 4877 revalidate_disk(mddev->gendisk); 4878 } 4879 } 4880 mddev_unlock(mddev); 4881 return err ?: len; 4882 } 4883 4884 static struct md_sysfs_entry md_array_size = 4885 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, 4886 array_size_store); 4887 4888 static struct attribute *md_default_attrs[] = { 4889 &md_level.attr, 4890 &md_layout.attr, 4891 &md_raid_disks.attr, 4892 &md_chunk_size.attr, 4893 &md_size.attr, 4894 &md_resync_start.attr, 4895 &md_metadata.attr, 4896 &md_new_device.attr, 4897 &md_safe_delay.attr, 4898 &md_array_state.attr, 4899 &md_reshape_position.attr, 4900 &md_reshape_direction.attr, 4901 &md_array_size.attr, 4902 &max_corr_read_errors.attr, 4903 NULL, 4904 }; 4905 4906 static struct attribute *md_redundancy_attrs[] = { 4907 &md_scan_mode.attr, 4908 &md_last_scan_mode.attr, 4909 &md_mismatches.attr, 4910 &md_sync_min.attr, 4911 &md_sync_max.attr, 4912 &md_sync_speed.attr, 4913 &md_sync_force_parallel.attr, 4914 &md_sync_completed.attr, 4915 &md_min_sync.attr, 4916 &md_max_sync.attr, 4917 &md_suspend_lo.attr, 4918 &md_suspend_hi.attr, 4919 &md_bitmap.attr, 4920 &md_degraded.attr, 4921 NULL, 4922 }; 4923 static struct attribute_group md_redundancy_group = { 4924 .name = NULL, 4925 .attrs = md_redundancy_attrs, 4926 }; 4927 4928 static ssize_t 4929 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 4930 { 4931 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 4932 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 4933 ssize_t rv; 4934 4935 if (!entry->show) 4936 return -EIO; 4937 spin_lock(&all_mddevs_lock); 4938 if (list_empty(&mddev->all_mddevs)) { 4939 spin_unlock(&all_mddevs_lock); 4940 return -EBUSY; 4941 } 4942 mddev_get(mddev); 4943 spin_unlock(&all_mddevs_lock); 4944 4945 rv = entry->show(mddev, page); 4946 mddev_put(mddev); 4947 return rv; 4948 } 4949 4950 static ssize_t 4951 md_attr_store(struct kobject *kobj, struct attribute *attr, 4952 const char *page, size_t length) 4953 { 4954 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 4955 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 4956 ssize_t rv; 4957 4958 if (!entry->store) 4959 return -EIO; 4960 if (!capable(CAP_SYS_ADMIN)) 4961 return -EACCES; 4962 spin_lock(&all_mddevs_lock); 4963 if (list_empty(&mddev->all_mddevs)) { 4964 spin_unlock(&all_mddevs_lock); 4965 return -EBUSY; 4966 } 4967 mddev_get(mddev); 4968 spin_unlock(&all_mddevs_lock); 4969 rv = entry->store(mddev, page, length); 4970 mddev_put(mddev); 4971 return rv; 4972 } 4973 4974 static void md_free(struct kobject *ko) 4975 { 4976 struct mddev *mddev = container_of(ko, struct mddev, kobj); 4977 4978 if (mddev->sysfs_state) 4979 sysfs_put(mddev->sysfs_state); 4980 4981 if (mddev->queue) 4982 blk_cleanup_queue(mddev->queue); 4983 if (mddev->gendisk) { 4984 del_gendisk(mddev->gendisk); 4985 put_disk(mddev->gendisk); 4986 } 4987 4988 kfree(mddev); 4989 } 4990 4991 static const struct sysfs_ops md_sysfs_ops = { 4992 .show = md_attr_show, 4993 .store = md_attr_store, 4994 }; 4995 static struct kobj_type md_ktype = { 4996 .release = md_free, 4997 .sysfs_ops = &md_sysfs_ops, 4998 .default_attrs = md_default_attrs, 4999 }; 5000 5001 int mdp_major = 0; 5002 5003 static void mddev_delayed_delete(struct work_struct *ws) 5004 { 5005 struct mddev *mddev = container_of(ws, struct mddev, del_work); 5006 5007 sysfs_remove_group(&mddev->kobj, &md_bitmap_group); 5008 kobject_del(&mddev->kobj); 5009 kobject_put(&mddev->kobj); 5010 } 5011 5012 static int md_alloc(dev_t dev, char *name) 5013 { 5014 static DEFINE_MUTEX(disks_mutex); 5015 struct mddev *mddev = mddev_find(dev); 5016 struct gendisk *disk; 5017 int partitioned; 5018 int shift; 5019 int unit; 5020 int error; 5021 5022 if (!mddev) 5023 return -ENODEV; 5024 5025 partitioned = (MAJOR(mddev->unit) != MD_MAJOR); 5026 shift = partitioned ? MdpMinorShift : 0; 5027 unit = MINOR(mddev->unit) >> shift; 5028 5029 /* wait for any previous instance of this device to be 5030 * completely removed (mddev_delayed_delete). 5031 */ 5032 flush_workqueue(md_misc_wq); 5033 5034 mutex_lock(&disks_mutex); 5035 error = -EEXIST; 5036 if (mddev->gendisk) 5037 goto abort; 5038 5039 if (name) { 5040 /* Need to ensure that 'name' is not a duplicate. 5041 */ 5042 struct mddev *mddev2; 5043 spin_lock(&all_mddevs_lock); 5044 5045 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) 5046 if (mddev2->gendisk && 5047 strcmp(mddev2->gendisk->disk_name, name) == 0) { 5048 spin_unlock(&all_mddevs_lock); 5049 goto abort; 5050 } 5051 spin_unlock(&all_mddevs_lock); 5052 } 5053 5054 error = -ENOMEM; 5055 mddev->queue = blk_alloc_queue(GFP_KERNEL); 5056 if (!mddev->queue) 5057 goto abort; 5058 mddev->queue->queuedata = mddev; 5059 5060 blk_queue_make_request(mddev->queue, md_make_request); 5061 blk_set_stacking_limits(&mddev->queue->limits); 5062 5063 disk = alloc_disk(1 << shift); 5064 if (!disk) { 5065 blk_cleanup_queue(mddev->queue); 5066 mddev->queue = NULL; 5067 goto abort; 5068 } 5069 disk->major = MAJOR(mddev->unit); 5070 disk->first_minor = unit << shift; 5071 if (name) 5072 strcpy(disk->disk_name, name); 5073 else if (partitioned) 5074 sprintf(disk->disk_name, "md_d%d", unit); 5075 else 5076 sprintf(disk->disk_name, "md%d", unit); 5077 disk->fops = &md_fops; 5078 disk->private_data = mddev; 5079 disk->queue = mddev->queue; 5080 blk_queue_write_cache(mddev->queue, true, true); 5081 /* Allow extended partitions. This makes the 5082 * 'mdp' device redundant, but we can't really 5083 * remove it now. 5084 */ 5085 disk->flags |= GENHD_FL_EXT_DEVT; 5086 mddev->gendisk = disk; 5087 /* As soon as we call add_disk(), another thread could get 5088 * through to md_open, so make sure it doesn't get too far 5089 */ 5090 mutex_lock(&mddev->open_mutex); 5091 add_disk(disk); 5092 5093 error = kobject_init_and_add(&mddev->kobj, &md_ktype, 5094 &disk_to_dev(disk)->kobj, "%s", "md"); 5095 if (error) { 5096 /* This isn't possible, but as kobject_init_and_add is marked 5097 * __must_check, we must do something with the result 5098 */ 5099 pr_debug("md: cannot register %s/md - name in use\n", 5100 disk->disk_name); 5101 error = 0; 5102 } 5103 if (mddev->kobj.sd && 5104 sysfs_create_group(&mddev->kobj, &md_bitmap_group)) 5105 pr_debug("pointless warning\n"); 5106 mutex_unlock(&mddev->open_mutex); 5107 abort: 5108 mutex_unlock(&disks_mutex); 5109 if (!error && mddev->kobj.sd) { 5110 kobject_uevent(&mddev->kobj, KOBJ_ADD); 5111 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); 5112 } 5113 mddev_put(mddev); 5114 return error; 5115 } 5116 5117 static struct kobject *md_probe(dev_t dev, int *part, void *data) 5118 { 5119 md_alloc(dev, NULL); 5120 return NULL; 5121 } 5122 5123 static int add_named_array(const char *val, struct kernel_param *kp) 5124 { 5125 /* val must be "md_*" where * is not all digits. 5126 * We allocate an array with a large free minor number, and 5127 * set the name to val. val must not already be an active name. 5128 */ 5129 int len = strlen(val); 5130 char buf[DISK_NAME_LEN]; 5131 5132 while (len && val[len-1] == '\n') 5133 len--; 5134 if (len >= DISK_NAME_LEN) 5135 return -E2BIG; 5136 strlcpy(buf, val, len+1); 5137 if (strncmp(buf, "md_", 3) != 0) 5138 return -EINVAL; 5139 return md_alloc(0, buf); 5140 } 5141 5142 static void md_safemode_timeout(unsigned long data) 5143 { 5144 struct mddev *mddev = (struct mddev *) data; 5145 5146 if (!atomic_read(&mddev->writes_pending)) { 5147 mddev->safemode = 1; 5148 if (mddev->external) 5149 sysfs_notify_dirent_safe(mddev->sysfs_state); 5150 } 5151 md_wakeup_thread(mddev->thread); 5152 } 5153 5154 static int start_dirty_degraded; 5155 5156 int md_run(struct mddev *mddev) 5157 { 5158 int err; 5159 struct md_rdev *rdev; 5160 struct md_personality *pers; 5161 5162 if (list_empty(&mddev->disks)) 5163 /* cannot run an array with no devices.. */ 5164 return -EINVAL; 5165 5166 if (mddev->pers) 5167 return -EBUSY; 5168 /* Cannot run until previous stop completes properly */ 5169 if (mddev->sysfs_active) 5170 return -EBUSY; 5171 5172 /* 5173 * Analyze all RAID superblock(s) 5174 */ 5175 if (!mddev->raid_disks) { 5176 if (!mddev->persistent) 5177 return -EINVAL; 5178 analyze_sbs(mddev); 5179 } 5180 5181 if (mddev->level != LEVEL_NONE) 5182 request_module("md-level-%d", mddev->level); 5183 else if (mddev->clevel[0]) 5184 request_module("md-%s", mddev->clevel); 5185 5186 /* 5187 * Drop all container device buffers, from now on 5188 * the only valid external interface is through the md 5189 * device. 5190 */ 5191 rdev_for_each(rdev, mddev) { 5192 if (test_bit(Faulty, &rdev->flags)) 5193 continue; 5194 sync_blockdev(rdev->bdev); 5195 invalidate_bdev(rdev->bdev); 5196 5197 /* perform some consistency tests on the device. 5198 * We don't want the data to overlap the metadata, 5199 * Internal Bitmap issues have been handled elsewhere. 5200 */ 5201 if (rdev->meta_bdev) { 5202 /* Nothing to check */; 5203 } else if (rdev->data_offset < rdev->sb_start) { 5204 if (mddev->dev_sectors && 5205 rdev->data_offset + mddev->dev_sectors 5206 > rdev->sb_start) { 5207 pr_warn("md: %s: data overlaps metadata\n", 5208 mdname(mddev)); 5209 return -EINVAL; 5210 } 5211 } else { 5212 if (rdev->sb_start + rdev->sb_size/512 5213 > rdev->data_offset) { 5214 pr_warn("md: %s: metadata overlaps data\n", 5215 mdname(mddev)); 5216 return -EINVAL; 5217 } 5218 } 5219 sysfs_notify_dirent_safe(rdev->sysfs_state); 5220 } 5221 5222 if (mddev->bio_set == NULL) { 5223 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); 5224 if (!mddev->bio_set) 5225 return -ENOMEM; 5226 } 5227 5228 spin_lock(&pers_lock); 5229 pers = find_pers(mddev->level, mddev->clevel); 5230 if (!pers || !try_module_get(pers->owner)) { 5231 spin_unlock(&pers_lock); 5232 if (mddev->level != LEVEL_NONE) 5233 pr_warn("md: personality for level %d is not loaded!\n", 5234 mddev->level); 5235 else 5236 pr_warn("md: personality for level %s is not loaded!\n", 5237 mddev->clevel); 5238 return -EINVAL; 5239 } 5240 spin_unlock(&pers_lock); 5241 if (mddev->level != pers->level) { 5242 mddev->level = pers->level; 5243 mddev->new_level = pers->level; 5244 } 5245 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 5246 5247 if (mddev->reshape_position != MaxSector && 5248 pers->start_reshape == NULL) { 5249 /* This personality cannot handle reshaping... */ 5250 module_put(pers->owner); 5251 return -EINVAL; 5252 } 5253 5254 if (pers->sync_request) { 5255 /* Warn if this is a potentially silly 5256 * configuration. 5257 */ 5258 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 5259 struct md_rdev *rdev2; 5260 int warned = 0; 5261 5262 rdev_for_each(rdev, mddev) 5263 rdev_for_each(rdev2, mddev) { 5264 if (rdev < rdev2 && 5265 rdev->bdev->bd_contains == 5266 rdev2->bdev->bd_contains) { 5267 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n", 5268 mdname(mddev), 5269 bdevname(rdev->bdev,b), 5270 bdevname(rdev2->bdev,b2)); 5271 warned = 1; 5272 } 5273 } 5274 5275 if (warned) 5276 pr_warn("True protection against single-disk failure might be compromised.\n"); 5277 } 5278 5279 mddev->recovery = 0; 5280 /* may be over-ridden by personality */ 5281 mddev->resync_max_sectors = mddev->dev_sectors; 5282 5283 mddev->ok_start_degraded = start_dirty_degraded; 5284 5285 if (start_readonly && mddev->ro == 0) 5286 mddev->ro = 2; /* read-only, but switch on first write */ 5287 5288 /* 5289 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes 5290 * up mddev->thread. It is important to initialize critical 5291 * resources for mddev->thread BEFORE calling pers->run(). 5292 */ 5293 err = pers->run(mddev); 5294 if (err) 5295 pr_warn("md: pers->run() failed ...\n"); 5296 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { 5297 WARN_ONCE(!mddev->external_size, 5298 "%s: default size too small, but 'external_size' not in effect?\n", 5299 __func__); 5300 pr_warn("md: invalid array_size %llu > default size %llu\n", 5301 (unsigned long long)mddev->array_sectors / 2, 5302 (unsigned long long)pers->size(mddev, 0, 0) / 2); 5303 err = -EINVAL; 5304 } 5305 if (err == 0 && pers->sync_request && 5306 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { 5307 struct bitmap *bitmap; 5308 5309 bitmap = bitmap_create(mddev, -1); 5310 if (IS_ERR(bitmap)) { 5311 err = PTR_ERR(bitmap); 5312 pr_warn("%s: failed to create bitmap (%d)\n", 5313 mdname(mddev), err); 5314 } else 5315 mddev->bitmap = bitmap; 5316 5317 } 5318 if (err) { 5319 mddev_detach(mddev); 5320 if (mddev->private) 5321 pers->free(mddev, mddev->private); 5322 mddev->private = NULL; 5323 module_put(pers->owner); 5324 bitmap_destroy(mddev); 5325 return err; 5326 } 5327 if (mddev->queue) { 5328 bool nonrot = true; 5329 5330 rdev_for_each(rdev, mddev) { 5331 if (rdev->raid_disk >= 0 && 5332 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { 5333 nonrot = false; 5334 break; 5335 } 5336 } 5337 if (mddev->degraded) 5338 nonrot = false; 5339 if (nonrot) 5340 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue); 5341 else 5342 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue); 5343 mddev->queue->backing_dev_info->congested_data = mddev; 5344 mddev->queue->backing_dev_info->congested_fn = md_congested; 5345 } 5346 if (pers->sync_request) { 5347 if (mddev->kobj.sd && 5348 sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 5349 pr_warn("md: cannot register extra attributes for %s\n", 5350 mdname(mddev)); 5351 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); 5352 } else if (mddev->ro == 2) /* auto-readonly not meaningful */ 5353 mddev->ro = 0; 5354 5355 atomic_set(&mddev->writes_pending,0); 5356 atomic_set(&mddev->max_corr_read_errors, 5357 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); 5358 mddev->safemode = 0; 5359 if (mddev_is_clustered(mddev)) 5360 mddev->safemode_delay = 0; 5361 else 5362 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ 5363 mddev->in_sync = 1; 5364 smp_wmb(); 5365 spin_lock(&mddev->lock); 5366 mddev->pers = pers; 5367 spin_unlock(&mddev->lock); 5368 rdev_for_each(rdev, mddev) 5369 if (rdev->raid_disk >= 0) 5370 if (sysfs_link_rdev(mddev, rdev)) 5371 /* failure here is OK */; 5372 5373 if (mddev->degraded && !mddev->ro) 5374 /* This ensures that recovering status is reported immediately 5375 * via sysfs - until a lack of spares is confirmed. 5376 */ 5377 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 5378 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5379 5380 if (mddev->sb_flags) 5381 md_update_sb(mddev, 0); 5382 5383 md_new_event(mddev); 5384 sysfs_notify_dirent_safe(mddev->sysfs_state); 5385 sysfs_notify_dirent_safe(mddev->sysfs_action); 5386 sysfs_notify(&mddev->kobj, NULL, "degraded"); 5387 return 0; 5388 } 5389 EXPORT_SYMBOL_GPL(md_run); 5390 5391 static int do_md_run(struct mddev *mddev) 5392 { 5393 int err; 5394 5395 err = md_run(mddev); 5396 if (err) 5397 goto out; 5398 err = bitmap_load(mddev); 5399 if (err) { 5400 bitmap_destroy(mddev); 5401 goto out; 5402 } 5403 5404 if (mddev_is_clustered(mddev)) 5405 md_allow_write(mddev); 5406 5407 md_wakeup_thread(mddev->thread); 5408 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 5409 5410 set_capacity(mddev->gendisk, mddev->array_sectors); 5411 revalidate_disk(mddev->gendisk); 5412 mddev->changed = 1; 5413 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 5414 out: 5415 return err; 5416 } 5417 5418 static int restart_array(struct mddev *mddev) 5419 { 5420 struct gendisk *disk = mddev->gendisk; 5421 5422 /* Complain if it has no devices */ 5423 if (list_empty(&mddev->disks)) 5424 return -ENXIO; 5425 if (!mddev->pers) 5426 return -EINVAL; 5427 if (!mddev->ro) 5428 return -EBUSY; 5429 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { 5430 struct md_rdev *rdev; 5431 bool has_journal = false; 5432 5433 rcu_read_lock(); 5434 rdev_for_each_rcu(rdev, mddev) { 5435 if (test_bit(Journal, &rdev->flags) && 5436 !test_bit(Faulty, &rdev->flags)) { 5437 has_journal = true; 5438 break; 5439 } 5440 } 5441 rcu_read_unlock(); 5442 5443 /* Don't restart rw with journal missing/faulty */ 5444 if (!has_journal) 5445 return -EINVAL; 5446 } 5447 5448 mddev->safemode = 0; 5449 mddev->ro = 0; 5450 set_disk_ro(disk, 0); 5451 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev)); 5452 /* Kick recovery or resync if necessary */ 5453 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5454 md_wakeup_thread(mddev->thread); 5455 md_wakeup_thread(mddev->sync_thread); 5456 sysfs_notify_dirent_safe(mddev->sysfs_state); 5457 return 0; 5458 } 5459 5460 static void md_clean(struct mddev *mddev) 5461 { 5462 mddev->array_sectors = 0; 5463 mddev->external_size = 0; 5464 mddev->dev_sectors = 0; 5465 mddev->raid_disks = 0; 5466 mddev->recovery_cp = 0; 5467 mddev->resync_min = 0; 5468 mddev->resync_max = MaxSector; 5469 mddev->reshape_position = MaxSector; 5470 mddev->external = 0; 5471 mddev->persistent = 0; 5472 mddev->level = LEVEL_NONE; 5473 mddev->clevel[0] = 0; 5474 mddev->flags = 0; 5475 mddev->sb_flags = 0; 5476 mddev->ro = 0; 5477 mddev->metadata_type[0] = 0; 5478 mddev->chunk_sectors = 0; 5479 mddev->ctime = mddev->utime = 0; 5480 mddev->layout = 0; 5481 mddev->max_disks = 0; 5482 mddev->events = 0; 5483 mddev->can_decrease_events = 0; 5484 mddev->delta_disks = 0; 5485 mddev->reshape_backwards = 0; 5486 mddev->new_level = LEVEL_NONE; 5487 mddev->new_layout = 0; 5488 mddev->new_chunk_sectors = 0; 5489 mddev->curr_resync = 0; 5490 atomic64_set(&mddev->resync_mismatches, 0); 5491 mddev->suspend_lo = mddev->suspend_hi = 0; 5492 mddev->sync_speed_min = mddev->sync_speed_max = 0; 5493 mddev->recovery = 0; 5494 mddev->in_sync = 0; 5495 mddev->changed = 0; 5496 mddev->degraded = 0; 5497 mddev->safemode = 0; 5498 mddev->private = NULL; 5499 mddev->cluster_info = NULL; 5500 mddev->bitmap_info.offset = 0; 5501 mddev->bitmap_info.default_offset = 0; 5502 mddev->bitmap_info.default_space = 0; 5503 mddev->bitmap_info.chunksize = 0; 5504 mddev->bitmap_info.daemon_sleep = 0; 5505 mddev->bitmap_info.max_write_behind = 0; 5506 mddev->bitmap_info.nodes = 0; 5507 } 5508 5509 static void __md_stop_writes(struct mddev *mddev) 5510 { 5511 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5512 flush_workqueue(md_misc_wq); 5513 if (mddev->sync_thread) { 5514 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5515 md_reap_sync_thread(mddev); 5516 } 5517 5518 del_timer_sync(&mddev->safemode_timer); 5519 5520 if (mddev->pers && mddev->pers->quiesce) { 5521 mddev->pers->quiesce(mddev, 1); 5522 mddev->pers->quiesce(mddev, 0); 5523 } 5524 bitmap_flush(mddev); 5525 5526 if (mddev->ro == 0 && 5527 ((!mddev->in_sync && !mddev_is_clustered(mddev)) || 5528 mddev->sb_flags)) { 5529 /* mark array as shutdown cleanly */ 5530 if (!mddev_is_clustered(mddev)) 5531 mddev->in_sync = 1; 5532 md_update_sb(mddev, 1); 5533 } 5534 } 5535 5536 void md_stop_writes(struct mddev *mddev) 5537 { 5538 mddev_lock_nointr(mddev); 5539 __md_stop_writes(mddev); 5540 mddev_unlock(mddev); 5541 } 5542 EXPORT_SYMBOL_GPL(md_stop_writes); 5543 5544 static void mddev_detach(struct mddev *mddev) 5545 { 5546 struct bitmap *bitmap = mddev->bitmap; 5547 /* wait for behind writes to complete */ 5548 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { 5549 pr_debug("md:%s: behind writes in progress - waiting to stop.\n", 5550 mdname(mddev)); 5551 /* need to kick something here to make sure I/O goes? */ 5552 wait_event(bitmap->behind_wait, 5553 atomic_read(&bitmap->behind_writes) == 0); 5554 } 5555 if (mddev->pers && mddev->pers->quiesce) { 5556 mddev->pers->quiesce(mddev, 1); 5557 mddev->pers->quiesce(mddev, 0); 5558 } 5559 md_unregister_thread(&mddev->thread); 5560 if (mddev->queue) 5561 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ 5562 } 5563 5564 static void __md_stop(struct mddev *mddev) 5565 { 5566 struct md_personality *pers = mddev->pers; 5567 mddev_detach(mddev); 5568 /* Ensure ->event_work is done */ 5569 flush_workqueue(md_misc_wq); 5570 spin_lock(&mddev->lock); 5571 mddev->pers = NULL; 5572 spin_unlock(&mddev->lock); 5573 pers->free(mddev, mddev->private); 5574 mddev->private = NULL; 5575 if (pers->sync_request && mddev->to_remove == NULL) 5576 mddev->to_remove = &md_redundancy_group; 5577 module_put(pers->owner); 5578 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5579 } 5580 5581 void md_stop(struct mddev *mddev) 5582 { 5583 /* stop the array and free an attached data structures. 5584 * This is called from dm-raid 5585 */ 5586 __md_stop(mddev); 5587 bitmap_destroy(mddev); 5588 if (mddev->bio_set) 5589 bioset_free(mddev->bio_set); 5590 } 5591 5592 EXPORT_SYMBOL_GPL(md_stop); 5593 5594 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) 5595 { 5596 int err = 0; 5597 int did_freeze = 0; 5598 5599 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { 5600 did_freeze = 1; 5601 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5602 md_wakeup_thread(mddev->thread); 5603 } 5604 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 5605 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5606 if (mddev->sync_thread) 5607 /* Thread might be blocked waiting for metadata update 5608 * which will now never happen */ 5609 wake_up_process(mddev->sync_thread->tsk); 5610 5611 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 5612 return -EBUSY; 5613 mddev_unlock(mddev); 5614 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, 5615 &mddev->recovery)); 5616 wait_event(mddev->sb_wait, 5617 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); 5618 mddev_lock_nointr(mddev); 5619 5620 mutex_lock(&mddev->open_mutex); 5621 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || 5622 mddev->sync_thread || 5623 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { 5624 pr_warn("md: %s still in use.\n",mdname(mddev)); 5625 if (did_freeze) { 5626 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5627 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5628 md_wakeup_thread(mddev->thread); 5629 } 5630 err = -EBUSY; 5631 goto out; 5632 } 5633 if (mddev->pers) { 5634 __md_stop_writes(mddev); 5635 5636 err = -ENXIO; 5637 if (mddev->ro==1) 5638 goto out; 5639 mddev->ro = 1; 5640 set_disk_ro(mddev->gendisk, 1); 5641 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5642 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5643 md_wakeup_thread(mddev->thread); 5644 sysfs_notify_dirent_safe(mddev->sysfs_state); 5645 err = 0; 5646 } 5647 out: 5648 mutex_unlock(&mddev->open_mutex); 5649 return err; 5650 } 5651 5652 /* mode: 5653 * 0 - completely stop and dis-assemble array 5654 * 2 - stop but do not disassemble array 5655 */ 5656 static int do_md_stop(struct mddev *mddev, int mode, 5657 struct block_device *bdev) 5658 { 5659 struct gendisk *disk = mddev->gendisk; 5660 struct md_rdev *rdev; 5661 int did_freeze = 0; 5662 5663 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { 5664 did_freeze = 1; 5665 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5666 md_wakeup_thread(mddev->thread); 5667 } 5668 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 5669 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5670 if (mddev->sync_thread) 5671 /* Thread might be blocked waiting for metadata update 5672 * which will now never happen */ 5673 wake_up_process(mddev->sync_thread->tsk); 5674 5675 mddev_unlock(mddev); 5676 wait_event(resync_wait, (mddev->sync_thread == NULL && 5677 !test_bit(MD_RECOVERY_RUNNING, 5678 &mddev->recovery))); 5679 mddev_lock_nointr(mddev); 5680 5681 mutex_lock(&mddev->open_mutex); 5682 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || 5683 mddev->sysfs_active || 5684 mddev->sync_thread || 5685 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { 5686 pr_warn("md: %s still in use.\n",mdname(mddev)); 5687 mutex_unlock(&mddev->open_mutex); 5688 if (did_freeze) { 5689 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5690 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5691 md_wakeup_thread(mddev->thread); 5692 } 5693 return -EBUSY; 5694 } 5695 if (mddev->pers) { 5696 if (mddev->ro) 5697 set_disk_ro(disk, 0); 5698 5699 __md_stop_writes(mddev); 5700 __md_stop(mddev); 5701 mddev->queue->backing_dev_info->congested_fn = NULL; 5702 5703 /* tell userspace to handle 'inactive' */ 5704 sysfs_notify_dirent_safe(mddev->sysfs_state); 5705 5706 rdev_for_each(rdev, mddev) 5707 if (rdev->raid_disk >= 0) 5708 sysfs_unlink_rdev(mddev, rdev); 5709 5710 set_capacity(disk, 0); 5711 mutex_unlock(&mddev->open_mutex); 5712 mddev->changed = 1; 5713 revalidate_disk(disk); 5714 5715 if (mddev->ro) 5716 mddev->ro = 0; 5717 } else 5718 mutex_unlock(&mddev->open_mutex); 5719 /* 5720 * Free resources if final stop 5721 */ 5722 if (mode == 0) { 5723 pr_info("md: %s stopped.\n", mdname(mddev)); 5724 5725 bitmap_destroy(mddev); 5726 if (mddev->bitmap_info.file) { 5727 struct file *f = mddev->bitmap_info.file; 5728 spin_lock(&mddev->lock); 5729 mddev->bitmap_info.file = NULL; 5730 spin_unlock(&mddev->lock); 5731 fput(f); 5732 } 5733 mddev->bitmap_info.offset = 0; 5734 5735 export_array(mddev); 5736 5737 md_clean(mddev); 5738 if (mddev->hold_active == UNTIL_STOP) 5739 mddev->hold_active = 0; 5740 } 5741 md_new_event(mddev); 5742 sysfs_notify_dirent_safe(mddev->sysfs_state); 5743 return 0; 5744 } 5745 5746 #ifndef MODULE 5747 static void autorun_array(struct mddev *mddev) 5748 { 5749 struct md_rdev *rdev; 5750 int err; 5751 5752 if (list_empty(&mddev->disks)) 5753 return; 5754 5755 pr_info("md: running: "); 5756 5757 rdev_for_each(rdev, mddev) { 5758 char b[BDEVNAME_SIZE]; 5759 pr_cont("<%s>", bdevname(rdev->bdev,b)); 5760 } 5761 pr_cont("\n"); 5762 5763 err = do_md_run(mddev); 5764 if (err) { 5765 pr_warn("md: do_md_run() returned %d\n", err); 5766 do_md_stop(mddev, 0, NULL); 5767 } 5768 } 5769 5770 /* 5771 * lets try to run arrays based on all disks that have arrived 5772 * until now. (those are in pending_raid_disks) 5773 * 5774 * the method: pick the first pending disk, collect all disks with 5775 * the same UUID, remove all from the pending list and put them into 5776 * the 'same_array' list. Then order this list based on superblock 5777 * update time (freshest comes first), kick out 'old' disks and 5778 * compare superblocks. If everything's fine then run it. 5779 * 5780 * If "unit" is allocated, then bump its reference count 5781 */ 5782 static void autorun_devices(int part) 5783 { 5784 struct md_rdev *rdev0, *rdev, *tmp; 5785 struct mddev *mddev; 5786 char b[BDEVNAME_SIZE]; 5787 5788 pr_info("md: autorun ...\n"); 5789 while (!list_empty(&pending_raid_disks)) { 5790 int unit; 5791 dev_t dev; 5792 LIST_HEAD(candidates); 5793 rdev0 = list_entry(pending_raid_disks.next, 5794 struct md_rdev, same_set); 5795 5796 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b)); 5797 INIT_LIST_HEAD(&candidates); 5798 rdev_for_each_list(rdev, tmp, &pending_raid_disks) 5799 if (super_90_load(rdev, rdev0, 0) >= 0) { 5800 pr_debug("md: adding %s ...\n", 5801 bdevname(rdev->bdev,b)); 5802 list_move(&rdev->same_set, &candidates); 5803 } 5804 /* 5805 * now we have a set of devices, with all of them having 5806 * mostly sane superblocks. It's time to allocate the 5807 * mddev. 5808 */ 5809 if (part) { 5810 dev = MKDEV(mdp_major, 5811 rdev0->preferred_minor << MdpMinorShift); 5812 unit = MINOR(dev) >> MdpMinorShift; 5813 } else { 5814 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 5815 unit = MINOR(dev); 5816 } 5817 if (rdev0->preferred_minor != unit) { 5818 pr_warn("md: unit number in %s is bad: %d\n", 5819 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 5820 break; 5821 } 5822 5823 md_probe(dev, NULL, NULL); 5824 mddev = mddev_find(dev); 5825 if (!mddev || !mddev->gendisk) { 5826 if (mddev) 5827 mddev_put(mddev); 5828 break; 5829 } 5830 if (mddev_lock(mddev)) 5831 pr_warn("md: %s locked, cannot run\n", mdname(mddev)); 5832 else if (mddev->raid_disks || mddev->major_version 5833 || !list_empty(&mddev->disks)) { 5834 pr_warn("md: %s already running, cannot run %s\n", 5835 mdname(mddev), bdevname(rdev0->bdev,b)); 5836 mddev_unlock(mddev); 5837 } else { 5838 pr_debug("md: created %s\n", mdname(mddev)); 5839 mddev->persistent = 1; 5840 rdev_for_each_list(rdev, tmp, &candidates) { 5841 list_del_init(&rdev->same_set); 5842 if (bind_rdev_to_array(rdev, mddev)) 5843 export_rdev(rdev); 5844 } 5845 autorun_array(mddev); 5846 mddev_unlock(mddev); 5847 } 5848 /* on success, candidates will be empty, on error 5849 * it won't... 5850 */ 5851 rdev_for_each_list(rdev, tmp, &candidates) { 5852 list_del_init(&rdev->same_set); 5853 export_rdev(rdev); 5854 } 5855 mddev_put(mddev); 5856 } 5857 pr_info("md: ... autorun DONE.\n"); 5858 } 5859 #endif /* !MODULE */ 5860 5861 static int get_version(void __user *arg) 5862 { 5863 mdu_version_t ver; 5864 5865 ver.major = MD_MAJOR_VERSION; 5866 ver.minor = MD_MINOR_VERSION; 5867 ver.patchlevel = MD_PATCHLEVEL_VERSION; 5868 5869 if (copy_to_user(arg, &ver, sizeof(ver))) 5870 return -EFAULT; 5871 5872 return 0; 5873 } 5874 5875 static int get_array_info(struct mddev *mddev, void __user *arg) 5876 { 5877 mdu_array_info_t info; 5878 int nr,working,insync,failed,spare; 5879 struct md_rdev *rdev; 5880 5881 nr = working = insync = failed = spare = 0; 5882 rcu_read_lock(); 5883 rdev_for_each_rcu(rdev, mddev) { 5884 nr++; 5885 if (test_bit(Faulty, &rdev->flags)) 5886 failed++; 5887 else { 5888 working++; 5889 if (test_bit(In_sync, &rdev->flags)) 5890 insync++; 5891 else if (test_bit(Journal, &rdev->flags)) 5892 /* TODO: add journal count to md_u.h */ 5893 ; 5894 else 5895 spare++; 5896 } 5897 } 5898 rcu_read_unlock(); 5899 5900 info.major_version = mddev->major_version; 5901 info.minor_version = mddev->minor_version; 5902 info.patch_version = MD_PATCHLEVEL_VERSION; 5903 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); 5904 info.level = mddev->level; 5905 info.size = mddev->dev_sectors / 2; 5906 if (info.size != mddev->dev_sectors / 2) /* overflow */ 5907 info.size = -1; 5908 info.nr_disks = nr; 5909 info.raid_disks = mddev->raid_disks; 5910 info.md_minor = mddev->md_minor; 5911 info.not_persistent= !mddev->persistent; 5912 5913 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); 5914 info.state = 0; 5915 if (mddev->in_sync) 5916 info.state = (1<<MD_SB_CLEAN); 5917 if (mddev->bitmap && mddev->bitmap_info.offset) 5918 info.state |= (1<<MD_SB_BITMAP_PRESENT); 5919 if (mddev_is_clustered(mddev)) 5920 info.state |= (1<<MD_SB_CLUSTERED); 5921 info.active_disks = insync; 5922 info.working_disks = working; 5923 info.failed_disks = failed; 5924 info.spare_disks = spare; 5925 5926 info.layout = mddev->layout; 5927 info.chunk_size = mddev->chunk_sectors << 9; 5928 5929 if (copy_to_user(arg, &info, sizeof(info))) 5930 return -EFAULT; 5931 5932 return 0; 5933 } 5934 5935 static int get_bitmap_file(struct mddev *mddev, void __user * arg) 5936 { 5937 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 5938 char *ptr; 5939 int err; 5940 5941 file = kzalloc(sizeof(*file), GFP_NOIO); 5942 if (!file) 5943 return -ENOMEM; 5944 5945 err = 0; 5946 spin_lock(&mddev->lock); 5947 /* bitmap enabled */ 5948 if (mddev->bitmap_info.file) { 5949 ptr = file_path(mddev->bitmap_info.file, file->pathname, 5950 sizeof(file->pathname)); 5951 if (IS_ERR(ptr)) 5952 err = PTR_ERR(ptr); 5953 else 5954 memmove(file->pathname, ptr, 5955 sizeof(file->pathname)-(ptr-file->pathname)); 5956 } 5957 spin_unlock(&mddev->lock); 5958 5959 if (err == 0 && 5960 copy_to_user(arg, file, sizeof(*file))) 5961 err = -EFAULT; 5962 5963 kfree(file); 5964 return err; 5965 } 5966 5967 static int get_disk_info(struct mddev *mddev, void __user * arg) 5968 { 5969 mdu_disk_info_t info; 5970 struct md_rdev *rdev; 5971 5972 if (copy_from_user(&info, arg, sizeof(info))) 5973 return -EFAULT; 5974 5975 rcu_read_lock(); 5976 rdev = md_find_rdev_nr_rcu(mddev, info.number); 5977 if (rdev) { 5978 info.major = MAJOR(rdev->bdev->bd_dev); 5979 info.minor = MINOR(rdev->bdev->bd_dev); 5980 info.raid_disk = rdev->raid_disk; 5981 info.state = 0; 5982 if (test_bit(Faulty, &rdev->flags)) 5983 info.state |= (1<<MD_DISK_FAULTY); 5984 else if (test_bit(In_sync, &rdev->flags)) { 5985 info.state |= (1<<MD_DISK_ACTIVE); 5986 info.state |= (1<<MD_DISK_SYNC); 5987 } 5988 if (test_bit(Journal, &rdev->flags)) 5989 info.state |= (1<<MD_DISK_JOURNAL); 5990 if (test_bit(WriteMostly, &rdev->flags)) 5991 info.state |= (1<<MD_DISK_WRITEMOSTLY); 5992 if (test_bit(FailFast, &rdev->flags)) 5993 info.state |= (1<<MD_DISK_FAILFAST); 5994 } else { 5995 info.major = info.minor = 0; 5996 info.raid_disk = -1; 5997 info.state = (1<<MD_DISK_REMOVED); 5998 } 5999 rcu_read_unlock(); 6000 6001 if (copy_to_user(arg, &info, sizeof(info))) 6002 return -EFAULT; 6003 6004 return 0; 6005 } 6006 6007 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) 6008 { 6009 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 6010 struct md_rdev *rdev; 6011 dev_t dev = MKDEV(info->major,info->minor); 6012 6013 if (mddev_is_clustered(mddev) && 6014 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { 6015 pr_warn("%s: Cannot add to clustered mddev.\n", 6016 mdname(mddev)); 6017 return -EINVAL; 6018 } 6019 6020 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 6021 return -EOVERFLOW; 6022 6023 if (!mddev->raid_disks) { 6024 int err; 6025 /* expecting a device which has a superblock */ 6026 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 6027 if (IS_ERR(rdev)) { 6028 pr_warn("md: md_import_device returned %ld\n", 6029 PTR_ERR(rdev)); 6030 return PTR_ERR(rdev); 6031 } 6032 if (!list_empty(&mddev->disks)) { 6033 struct md_rdev *rdev0 6034 = list_entry(mddev->disks.next, 6035 struct md_rdev, same_set); 6036 err = super_types[mddev->major_version] 6037 .load_super(rdev, rdev0, mddev->minor_version); 6038 if (err < 0) { 6039 pr_warn("md: %s has different UUID to %s\n", 6040 bdevname(rdev->bdev,b), 6041 bdevname(rdev0->bdev,b2)); 6042 export_rdev(rdev); 6043 return -EINVAL; 6044 } 6045 } 6046 err = bind_rdev_to_array(rdev, mddev); 6047 if (err) 6048 export_rdev(rdev); 6049 return err; 6050 } 6051 6052 /* 6053 * add_new_disk can be used once the array is assembled 6054 * to add "hot spares". They must already have a superblock 6055 * written 6056 */ 6057 if (mddev->pers) { 6058 int err; 6059 if (!mddev->pers->hot_add_disk) { 6060 pr_warn("%s: personality does not support diskops!\n", 6061 mdname(mddev)); 6062 return -EINVAL; 6063 } 6064 if (mddev->persistent) 6065 rdev = md_import_device(dev, mddev->major_version, 6066 mddev->minor_version); 6067 else 6068 rdev = md_import_device(dev, -1, -1); 6069 if (IS_ERR(rdev)) { 6070 pr_warn("md: md_import_device returned %ld\n", 6071 PTR_ERR(rdev)); 6072 return PTR_ERR(rdev); 6073 } 6074 /* set saved_raid_disk if appropriate */ 6075 if (!mddev->persistent) { 6076 if (info->state & (1<<MD_DISK_SYNC) && 6077 info->raid_disk < mddev->raid_disks) { 6078 rdev->raid_disk = info->raid_disk; 6079 set_bit(In_sync, &rdev->flags); 6080 clear_bit(Bitmap_sync, &rdev->flags); 6081 } else 6082 rdev->raid_disk = -1; 6083 rdev->saved_raid_disk = rdev->raid_disk; 6084 } else 6085 super_types[mddev->major_version]. 6086 validate_super(mddev, rdev); 6087 if ((info->state & (1<<MD_DISK_SYNC)) && 6088 rdev->raid_disk != info->raid_disk) { 6089 /* This was a hot-add request, but events doesn't 6090 * match, so reject it. 6091 */ 6092 export_rdev(rdev); 6093 return -EINVAL; 6094 } 6095 6096 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 6097 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 6098 set_bit(WriteMostly, &rdev->flags); 6099 else 6100 clear_bit(WriteMostly, &rdev->flags); 6101 if (info->state & (1<<MD_DISK_FAILFAST)) 6102 set_bit(FailFast, &rdev->flags); 6103 else 6104 clear_bit(FailFast, &rdev->flags); 6105 6106 if (info->state & (1<<MD_DISK_JOURNAL)) { 6107 struct md_rdev *rdev2; 6108 bool has_journal = false; 6109 6110 /* make sure no existing journal disk */ 6111 rdev_for_each(rdev2, mddev) { 6112 if (test_bit(Journal, &rdev2->flags)) { 6113 has_journal = true; 6114 break; 6115 } 6116 } 6117 if (has_journal) { 6118 export_rdev(rdev); 6119 return -EBUSY; 6120 } 6121 set_bit(Journal, &rdev->flags); 6122 } 6123 /* 6124 * check whether the device shows up in other nodes 6125 */ 6126 if (mddev_is_clustered(mddev)) { 6127 if (info->state & (1 << MD_DISK_CANDIDATE)) 6128 set_bit(Candidate, &rdev->flags); 6129 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { 6130 /* --add initiated by this node */ 6131 err = md_cluster_ops->add_new_disk(mddev, rdev); 6132 if (err) { 6133 export_rdev(rdev); 6134 return err; 6135 } 6136 } 6137 } 6138 6139 rdev->raid_disk = -1; 6140 err = bind_rdev_to_array(rdev, mddev); 6141 6142 if (err) 6143 export_rdev(rdev); 6144 6145 if (mddev_is_clustered(mddev)) { 6146 if (info->state & (1 << MD_DISK_CANDIDATE)) { 6147 if (!err) { 6148 err = md_cluster_ops->new_disk_ack(mddev, 6149 err == 0); 6150 if (err) 6151 md_kick_rdev_from_array(rdev); 6152 } 6153 } else { 6154 if (err) 6155 md_cluster_ops->add_new_disk_cancel(mddev); 6156 else 6157 err = add_bound_rdev(rdev); 6158 } 6159 6160 } else if (!err) 6161 err = add_bound_rdev(rdev); 6162 6163 return err; 6164 } 6165 6166 /* otherwise, add_new_disk is only allowed 6167 * for major_version==0 superblocks 6168 */ 6169 if (mddev->major_version != 0) { 6170 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev)); 6171 return -EINVAL; 6172 } 6173 6174 if (!(info->state & (1<<MD_DISK_FAULTY))) { 6175 int err; 6176 rdev = md_import_device(dev, -1, 0); 6177 if (IS_ERR(rdev)) { 6178 pr_warn("md: error, md_import_device() returned %ld\n", 6179 PTR_ERR(rdev)); 6180 return PTR_ERR(rdev); 6181 } 6182 rdev->desc_nr = info->number; 6183 if (info->raid_disk < mddev->raid_disks) 6184 rdev->raid_disk = info->raid_disk; 6185 else 6186 rdev->raid_disk = -1; 6187 6188 if (rdev->raid_disk < mddev->raid_disks) 6189 if (info->state & (1<<MD_DISK_SYNC)) 6190 set_bit(In_sync, &rdev->flags); 6191 6192 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 6193 set_bit(WriteMostly, &rdev->flags); 6194 if (info->state & (1<<MD_DISK_FAILFAST)) 6195 set_bit(FailFast, &rdev->flags); 6196 6197 if (!mddev->persistent) { 6198 pr_debug("md: nonpersistent superblock ...\n"); 6199 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 6200 } else 6201 rdev->sb_start = calc_dev_sboffset(rdev); 6202 rdev->sectors = rdev->sb_start; 6203 6204 err = bind_rdev_to_array(rdev, mddev); 6205 if (err) { 6206 export_rdev(rdev); 6207 return err; 6208 } 6209 } 6210 6211 return 0; 6212 } 6213 6214 static int hot_remove_disk(struct mddev *mddev, dev_t dev) 6215 { 6216 char b[BDEVNAME_SIZE]; 6217 struct md_rdev *rdev; 6218 6219 rdev = find_rdev(mddev, dev); 6220 if (!rdev) 6221 return -ENXIO; 6222 6223 if (rdev->raid_disk < 0) 6224 goto kick_rdev; 6225 6226 clear_bit(Blocked, &rdev->flags); 6227 remove_and_add_spares(mddev, rdev); 6228 6229 if (rdev->raid_disk >= 0) 6230 goto busy; 6231 6232 kick_rdev: 6233 if (mddev_is_clustered(mddev)) 6234 md_cluster_ops->remove_disk(mddev, rdev); 6235 6236 md_kick_rdev_from_array(rdev); 6237 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 6238 if (mddev->thread) 6239 md_wakeup_thread(mddev->thread); 6240 else 6241 md_update_sb(mddev, 1); 6242 md_new_event(mddev); 6243 6244 return 0; 6245 busy: 6246 pr_debug("md: cannot remove active disk %s from %s ...\n", 6247 bdevname(rdev->bdev,b), mdname(mddev)); 6248 return -EBUSY; 6249 } 6250 6251 static int hot_add_disk(struct mddev *mddev, dev_t dev) 6252 { 6253 char b[BDEVNAME_SIZE]; 6254 int err; 6255 struct md_rdev *rdev; 6256 6257 if (!mddev->pers) 6258 return -ENODEV; 6259 6260 if (mddev->major_version != 0) { 6261 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n", 6262 mdname(mddev)); 6263 return -EINVAL; 6264 } 6265 if (!mddev->pers->hot_add_disk) { 6266 pr_warn("%s: personality does not support diskops!\n", 6267 mdname(mddev)); 6268 return -EINVAL; 6269 } 6270 6271 rdev = md_import_device(dev, -1, 0); 6272 if (IS_ERR(rdev)) { 6273 pr_warn("md: error, md_import_device() returned %ld\n", 6274 PTR_ERR(rdev)); 6275 return -EINVAL; 6276 } 6277 6278 if (mddev->persistent) 6279 rdev->sb_start = calc_dev_sboffset(rdev); 6280 else 6281 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 6282 6283 rdev->sectors = rdev->sb_start; 6284 6285 if (test_bit(Faulty, &rdev->flags)) { 6286 pr_warn("md: can not hot-add faulty %s disk to %s!\n", 6287 bdevname(rdev->bdev,b), mdname(mddev)); 6288 err = -EINVAL; 6289 goto abort_export; 6290 } 6291 6292 clear_bit(In_sync, &rdev->flags); 6293 rdev->desc_nr = -1; 6294 rdev->saved_raid_disk = -1; 6295 err = bind_rdev_to_array(rdev, mddev); 6296 if (err) 6297 goto abort_export; 6298 6299 /* 6300 * The rest should better be atomic, we can have disk failures 6301 * noticed in interrupt contexts ... 6302 */ 6303 6304 rdev->raid_disk = -1; 6305 6306 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 6307 if (!mddev->thread) 6308 md_update_sb(mddev, 1); 6309 /* 6310 * Kick recovery, maybe this spare has to be added to the 6311 * array immediately. 6312 */ 6313 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6314 md_wakeup_thread(mddev->thread); 6315 md_new_event(mddev); 6316 return 0; 6317 6318 abort_export: 6319 export_rdev(rdev); 6320 return err; 6321 } 6322 6323 static int set_bitmap_file(struct mddev *mddev, int fd) 6324 { 6325 int err = 0; 6326 6327 if (mddev->pers) { 6328 if (!mddev->pers->quiesce || !mddev->thread) 6329 return -EBUSY; 6330 if (mddev->recovery || mddev->sync_thread) 6331 return -EBUSY; 6332 /* we should be able to change the bitmap.. */ 6333 } 6334 6335 if (fd >= 0) { 6336 struct inode *inode; 6337 struct file *f; 6338 6339 if (mddev->bitmap || mddev->bitmap_info.file) 6340 return -EEXIST; /* cannot add when bitmap is present */ 6341 f = fget(fd); 6342 6343 if (f == NULL) { 6344 pr_warn("%s: error: failed to get bitmap file\n", 6345 mdname(mddev)); 6346 return -EBADF; 6347 } 6348 6349 inode = f->f_mapping->host; 6350 if (!S_ISREG(inode->i_mode)) { 6351 pr_warn("%s: error: bitmap file must be a regular file\n", 6352 mdname(mddev)); 6353 err = -EBADF; 6354 } else if (!(f->f_mode & FMODE_WRITE)) { 6355 pr_warn("%s: error: bitmap file must open for write\n", 6356 mdname(mddev)); 6357 err = -EBADF; 6358 } else if (atomic_read(&inode->i_writecount) != 1) { 6359 pr_warn("%s: error: bitmap file is already in use\n", 6360 mdname(mddev)); 6361 err = -EBUSY; 6362 } 6363 if (err) { 6364 fput(f); 6365 return err; 6366 } 6367 mddev->bitmap_info.file = f; 6368 mddev->bitmap_info.offset = 0; /* file overrides offset */ 6369 } else if (mddev->bitmap == NULL) 6370 return -ENOENT; /* cannot remove what isn't there */ 6371 err = 0; 6372 if (mddev->pers) { 6373 mddev->pers->quiesce(mddev, 1); 6374 if (fd >= 0) { 6375 struct bitmap *bitmap; 6376 6377 bitmap = bitmap_create(mddev, -1); 6378 if (!IS_ERR(bitmap)) { 6379 mddev->bitmap = bitmap; 6380 err = bitmap_load(mddev); 6381 } else 6382 err = PTR_ERR(bitmap); 6383 } 6384 if (fd < 0 || err) { 6385 bitmap_destroy(mddev); 6386 fd = -1; /* make sure to put the file */ 6387 } 6388 mddev->pers->quiesce(mddev, 0); 6389 } 6390 if (fd < 0) { 6391 struct file *f = mddev->bitmap_info.file; 6392 if (f) { 6393 spin_lock(&mddev->lock); 6394 mddev->bitmap_info.file = NULL; 6395 spin_unlock(&mddev->lock); 6396 fput(f); 6397 } 6398 } 6399 6400 return err; 6401 } 6402 6403 /* 6404 * set_array_info is used two different ways 6405 * The original usage is when creating a new array. 6406 * In this usage, raid_disks is > 0 and it together with 6407 * level, size, not_persistent,layout,chunksize determine the 6408 * shape of the array. 6409 * This will always create an array with a type-0.90.0 superblock. 6410 * The newer usage is when assembling an array. 6411 * In this case raid_disks will be 0, and the major_version field is 6412 * use to determine which style super-blocks are to be found on the devices. 6413 * The minor and patch _version numbers are also kept incase the 6414 * super_block handler wishes to interpret them. 6415 */ 6416 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) 6417 { 6418 6419 if (info->raid_disks == 0) { 6420 /* just setting version number for superblock loading */ 6421 if (info->major_version < 0 || 6422 info->major_version >= ARRAY_SIZE(super_types) || 6423 super_types[info->major_version].name == NULL) { 6424 /* maybe try to auto-load a module? */ 6425 pr_warn("md: superblock version %d not known\n", 6426 info->major_version); 6427 return -EINVAL; 6428 } 6429 mddev->major_version = info->major_version; 6430 mddev->minor_version = info->minor_version; 6431 mddev->patch_version = info->patch_version; 6432 mddev->persistent = !info->not_persistent; 6433 /* ensure mddev_put doesn't delete this now that there 6434 * is some minimal configuration. 6435 */ 6436 mddev->ctime = ktime_get_real_seconds(); 6437 return 0; 6438 } 6439 mddev->major_version = MD_MAJOR_VERSION; 6440 mddev->minor_version = MD_MINOR_VERSION; 6441 mddev->patch_version = MD_PATCHLEVEL_VERSION; 6442 mddev->ctime = ktime_get_real_seconds(); 6443 6444 mddev->level = info->level; 6445 mddev->clevel[0] = 0; 6446 mddev->dev_sectors = 2 * (sector_t)info->size; 6447 mddev->raid_disks = info->raid_disks; 6448 /* don't set md_minor, it is determined by which /dev/md* was 6449 * openned 6450 */ 6451 if (info->state & (1<<MD_SB_CLEAN)) 6452 mddev->recovery_cp = MaxSector; 6453 else 6454 mddev->recovery_cp = 0; 6455 mddev->persistent = ! info->not_persistent; 6456 mddev->external = 0; 6457 6458 mddev->layout = info->layout; 6459 mddev->chunk_sectors = info->chunk_size >> 9; 6460 6461 mddev->max_disks = MD_SB_DISKS; 6462 6463 if (mddev->persistent) { 6464 mddev->flags = 0; 6465 mddev->sb_flags = 0; 6466 } 6467 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 6468 6469 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 6470 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); 6471 mddev->bitmap_info.offset = 0; 6472 6473 mddev->reshape_position = MaxSector; 6474 6475 /* 6476 * Generate a 128 bit UUID 6477 */ 6478 get_random_bytes(mddev->uuid, 16); 6479 6480 mddev->new_level = mddev->level; 6481 mddev->new_chunk_sectors = mddev->chunk_sectors; 6482 mddev->new_layout = mddev->layout; 6483 mddev->delta_disks = 0; 6484 mddev->reshape_backwards = 0; 6485 6486 return 0; 6487 } 6488 6489 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) 6490 { 6491 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); 6492 6493 if (mddev->external_size) 6494 return; 6495 6496 mddev->array_sectors = array_sectors; 6497 } 6498 EXPORT_SYMBOL(md_set_array_sectors); 6499 6500 static int update_size(struct mddev *mddev, sector_t num_sectors) 6501 { 6502 struct md_rdev *rdev; 6503 int rv; 6504 int fit = (num_sectors == 0); 6505 6506 /* cluster raid doesn't support update size */ 6507 if (mddev_is_clustered(mddev)) 6508 return -EINVAL; 6509 6510 if (mddev->pers->resize == NULL) 6511 return -EINVAL; 6512 /* The "num_sectors" is the number of sectors of each device that 6513 * is used. This can only make sense for arrays with redundancy. 6514 * linear and raid0 always use whatever space is available. We can only 6515 * consider changing this number if no resync or reconstruction is 6516 * happening, and if the new size is acceptable. It must fit before the 6517 * sb_start or, if that is <data_offset, it must fit before the size 6518 * of each device. If num_sectors is zero, we find the largest size 6519 * that fits. 6520 */ 6521 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 6522 mddev->sync_thread) 6523 return -EBUSY; 6524 if (mddev->ro) 6525 return -EROFS; 6526 6527 rdev_for_each(rdev, mddev) { 6528 sector_t avail = rdev->sectors; 6529 6530 if (fit && (num_sectors == 0 || num_sectors > avail)) 6531 num_sectors = avail; 6532 if (avail < num_sectors) 6533 return -ENOSPC; 6534 } 6535 rv = mddev->pers->resize(mddev, num_sectors); 6536 if (!rv) 6537 revalidate_disk(mddev->gendisk); 6538 return rv; 6539 } 6540 6541 static int update_raid_disks(struct mddev *mddev, int raid_disks) 6542 { 6543 int rv; 6544 struct md_rdev *rdev; 6545 /* change the number of raid disks */ 6546 if (mddev->pers->check_reshape == NULL) 6547 return -EINVAL; 6548 if (mddev->ro) 6549 return -EROFS; 6550 if (raid_disks <= 0 || 6551 (mddev->max_disks && raid_disks >= mddev->max_disks)) 6552 return -EINVAL; 6553 if (mddev->sync_thread || 6554 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 6555 mddev->reshape_position != MaxSector) 6556 return -EBUSY; 6557 6558 rdev_for_each(rdev, mddev) { 6559 if (mddev->raid_disks < raid_disks && 6560 rdev->data_offset < rdev->new_data_offset) 6561 return -EINVAL; 6562 if (mddev->raid_disks > raid_disks && 6563 rdev->data_offset > rdev->new_data_offset) 6564 return -EINVAL; 6565 } 6566 6567 mddev->delta_disks = raid_disks - mddev->raid_disks; 6568 if (mddev->delta_disks < 0) 6569 mddev->reshape_backwards = 1; 6570 else if (mddev->delta_disks > 0) 6571 mddev->reshape_backwards = 0; 6572 6573 rv = mddev->pers->check_reshape(mddev); 6574 if (rv < 0) { 6575 mddev->delta_disks = 0; 6576 mddev->reshape_backwards = 0; 6577 } 6578 return rv; 6579 } 6580 6581 /* 6582 * update_array_info is used to change the configuration of an 6583 * on-line array. 6584 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 6585 * fields in the info are checked against the array. 6586 * Any differences that cannot be handled will cause an error. 6587 * Normally, only one change can be managed at a time. 6588 */ 6589 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) 6590 { 6591 int rv = 0; 6592 int cnt = 0; 6593 int state = 0; 6594 6595 /* calculate expected state,ignoring low bits */ 6596 if (mddev->bitmap && mddev->bitmap_info.offset) 6597 state |= (1 << MD_SB_BITMAP_PRESENT); 6598 6599 if (mddev->major_version != info->major_version || 6600 mddev->minor_version != info->minor_version || 6601 /* mddev->patch_version != info->patch_version || */ 6602 mddev->ctime != info->ctime || 6603 mddev->level != info->level || 6604 /* mddev->layout != info->layout || */ 6605 mddev->persistent != !info->not_persistent || 6606 mddev->chunk_sectors != info->chunk_size >> 9 || 6607 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 6608 ((state^info->state) & 0xfffffe00) 6609 ) 6610 return -EINVAL; 6611 /* Check there is only one change */ 6612 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 6613 cnt++; 6614 if (mddev->raid_disks != info->raid_disks) 6615 cnt++; 6616 if (mddev->layout != info->layout) 6617 cnt++; 6618 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) 6619 cnt++; 6620 if (cnt == 0) 6621 return 0; 6622 if (cnt > 1) 6623 return -EINVAL; 6624 6625 if (mddev->layout != info->layout) { 6626 /* Change layout 6627 * we don't need to do anything at the md level, the 6628 * personality will take care of it all. 6629 */ 6630 if (mddev->pers->check_reshape == NULL) 6631 return -EINVAL; 6632 else { 6633 mddev->new_layout = info->layout; 6634 rv = mddev->pers->check_reshape(mddev); 6635 if (rv) 6636 mddev->new_layout = mddev->layout; 6637 return rv; 6638 } 6639 } 6640 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 6641 rv = update_size(mddev, (sector_t)info->size * 2); 6642 6643 if (mddev->raid_disks != info->raid_disks) 6644 rv = update_raid_disks(mddev, info->raid_disks); 6645 6646 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 6647 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { 6648 rv = -EINVAL; 6649 goto err; 6650 } 6651 if (mddev->recovery || mddev->sync_thread) { 6652 rv = -EBUSY; 6653 goto err; 6654 } 6655 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 6656 struct bitmap *bitmap; 6657 /* add the bitmap */ 6658 if (mddev->bitmap) { 6659 rv = -EEXIST; 6660 goto err; 6661 } 6662 if (mddev->bitmap_info.default_offset == 0) { 6663 rv = -EINVAL; 6664 goto err; 6665 } 6666 mddev->bitmap_info.offset = 6667 mddev->bitmap_info.default_offset; 6668 mddev->bitmap_info.space = 6669 mddev->bitmap_info.default_space; 6670 mddev->pers->quiesce(mddev, 1); 6671 bitmap = bitmap_create(mddev, -1); 6672 if (!IS_ERR(bitmap)) { 6673 mddev->bitmap = bitmap; 6674 rv = bitmap_load(mddev); 6675 } else 6676 rv = PTR_ERR(bitmap); 6677 if (rv) 6678 bitmap_destroy(mddev); 6679 mddev->pers->quiesce(mddev, 0); 6680 } else { 6681 /* remove the bitmap */ 6682 if (!mddev->bitmap) { 6683 rv = -ENOENT; 6684 goto err; 6685 } 6686 if (mddev->bitmap->storage.file) { 6687 rv = -EINVAL; 6688 goto err; 6689 } 6690 if (mddev->bitmap_info.nodes) { 6691 /* hold PW on all the bitmap lock */ 6692 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { 6693 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n"); 6694 rv = -EPERM; 6695 md_cluster_ops->unlock_all_bitmaps(mddev); 6696 goto err; 6697 } 6698 6699 mddev->bitmap_info.nodes = 0; 6700 md_cluster_ops->leave(mddev); 6701 } 6702 mddev->pers->quiesce(mddev, 1); 6703 bitmap_destroy(mddev); 6704 mddev->pers->quiesce(mddev, 0); 6705 mddev->bitmap_info.offset = 0; 6706 } 6707 } 6708 md_update_sb(mddev, 1); 6709 return rv; 6710 err: 6711 return rv; 6712 } 6713 6714 static int set_disk_faulty(struct mddev *mddev, dev_t dev) 6715 { 6716 struct md_rdev *rdev; 6717 int err = 0; 6718 6719 if (mddev->pers == NULL) 6720 return -ENODEV; 6721 6722 rcu_read_lock(); 6723 rdev = find_rdev_rcu(mddev, dev); 6724 if (!rdev) 6725 err = -ENODEV; 6726 else { 6727 md_error(mddev, rdev); 6728 if (!test_bit(Faulty, &rdev->flags)) 6729 err = -EBUSY; 6730 } 6731 rcu_read_unlock(); 6732 return err; 6733 } 6734 6735 /* 6736 * We have a problem here : there is no easy way to give a CHS 6737 * virtual geometry. We currently pretend that we have a 2 heads 6738 * 4 sectors (with a BIG number of cylinders...). This drives 6739 * dosfs just mad... ;-) 6740 */ 6741 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) 6742 { 6743 struct mddev *mddev = bdev->bd_disk->private_data; 6744 6745 geo->heads = 2; 6746 geo->sectors = 4; 6747 geo->cylinders = mddev->array_sectors / 8; 6748 return 0; 6749 } 6750 6751 static inline bool md_ioctl_valid(unsigned int cmd) 6752 { 6753 switch (cmd) { 6754 case ADD_NEW_DISK: 6755 case BLKROSET: 6756 case GET_ARRAY_INFO: 6757 case GET_BITMAP_FILE: 6758 case GET_DISK_INFO: 6759 case HOT_ADD_DISK: 6760 case HOT_REMOVE_DISK: 6761 case RAID_AUTORUN: 6762 case RAID_VERSION: 6763 case RESTART_ARRAY_RW: 6764 case RUN_ARRAY: 6765 case SET_ARRAY_INFO: 6766 case SET_BITMAP_FILE: 6767 case SET_DISK_FAULTY: 6768 case STOP_ARRAY: 6769 case STOP_ARRAY_RO: 6770 case CLUSTERED_DISK_NACK: 6771 return true; 6772 default: 6773 return false; 6774 } 6775 } 6776 6777 static int md_ioctl(struct block_device *bdev, fmode_t mode, 6778 unsigned int cmd, unsigned long arg) 6779 { 6780 int err = 0; 6781 void __user *argp = (void __user *)arg; 6782 struct mddev *mddev = NULL; 6783 int ro; 6784 6785 if (!md_ioctl_valid(cmd)) 6786 return -ENOTTY; 6787 6788 switch (cmd) { 6789 case RAID_VERSION: 6790 case GET_ARRAY_INFO: 6791 case GET_DISK_INFO: 6792 break; 6793 default: 6794 if (!capable(CAP_SYS_ADMIN)) 6795 return -EACCES; 6796 } 6797 6798 /* 6799 * Commands dealing with the RAID driver but not any 6800 * particular array: 6801 */ 6802 switch (cmd) { 6803 case RAID_VERSION: 6804 err = get_version(argp); 6805 goto out; 6806 6807 #ifndef MODULE 6808 case RAID_AUTORUN: 6809 err = 0; 6810 autostart_arrays(arg); 6811 goto out; 6812 #endif 6813 default:; 6814 } 6815 6816 /* 6817 * Commands creating/starting a new array: 6818 */ 6819 6820 mddev = bdev->bd_disk->private_data; 6821 6822 if (!mddev) { 6823 BUG(); 6824 goto out; 6825 } 6826 6827 /* Some actions do not requires the mutex */ 6828 switch (cmd) { 6829 case GET_ARRAY_INFO: 6830 if (!mddev->raid_disks && !mddev->external) 6831 err = -ENODEV; 6832 else 6833 err = get_array_info(mddev, argp); 6834 goto out; 6835 6836 case GET_DISK_INFO: 6837 if (!mddev->raid_disks && !mddev->external) 6838 err = -ENODEV; 6839 else 6840 err = get_disk_info(mddev, argp); 6841 goto out; 6842 6843 case SET_DISK_FAULTY: 6844 err = set_disk_faulty(mddev, new_decode_dev(arg)); 6845 goto out; 6846 6847 case GET_BITMAP_FILE: 6848 err = get_bitmap_file(mddev, argp); 6849 goto out; 6850 6851 } 6852 6853 if (cmd == ADD_NEW_DISK) 6854 /* need to ensure md_delayed_delete() has completed */ 6855 flush_workqueue(md_misc_wq); 6856 6857 if (cmd == HOT_REMOVE_DISK) 6858 /* need to ensure recovery thread has run */ 6859 wait_event_interruptible_timeout(mddev->sb_wait, 6860 !test_bit(MD_RECOVERY_NEEDED, 6861 &mddev->recovery), 6862 msecs_to_jiffies(5000)); 6863 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { 6864 /* Need to flush page cache, and ensure no-one else opens 6865 * and writes 6866 */ 6867 mutex_lock(&mddev->open_mutex); 6868 if (mddev->pers && atomic_read(&mddev->openers) > 1) { 6869 mutex_unlock(&mddev->open_mutex); 6870 err = -EBUSY; 6871 goto out; 6872 } 6873 set_bit(MD_CLOSING, &mddev->flags); 6874 mutex_unlock(&mddev->open_mutex); 6875 sync_blockdev(bdev); 6876 } 6877 err = mddev_lock(mddev); 6878 if (err) { 6879 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n", 6880 err, cmd); 6881 goto out; 6882 } 6883 6884 if (cmd == SET_ARRAY_INFO) { 6885 mdu_array_info_t info; 6886 if (!arg) 6887 memset(&info, 0, sizeof(info)); 6888 else if (copy_from_user(&info, argp, sizeof(info))) { 6889 err = -EFAULT; 6890 goto unlock; 6891 } 6892 if (mddev->pers) { 6893 err = update_array_info(mddev, &info); 6894 if (err) { 6895 pr_warn("md: couldn't update array info. %d\n", err); 6896 goto unlock; 6897 } 6898 goto unlock; 6899 } 6900 if (!list_empty(&mddev->disks)) { 6901 pr_warn("md: array %s already has disks!\n", mdname(mddev)); 6902 err = -EBUSY; 6903 goto unlock; 6904 } 6905 if (mddev->raid_disks) { 6906 pr_warn("md: array %s already initialised!\n", mdname(mddev)); 6907 err = -EBUSY; 6908 goto unlock; 6909 } 6910 err = set_array_info(mddev, &info); 6911 if (err) { 6912 pr_warn("md: couldn't set array info. %d\n", err); 6913 goto unlock; 6914 } 6915 goto unlock; 6916 } 6917 6918 /* 6919 * Commands querying/configuring an existing array: 6920 */ 6921 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 6922 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ 6923 if ((!mddev->raid_disks && !mddev->external) 6924 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 6925 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE 6926 && cmd != GET_BITMAP_FILE) { 6927 err = -ENODEV; 6928 goto unlock; 6929 } 6930 6931 /* 6932 * Commands even a read-only array can execute: 6933 */ 6934 switch (cmd) { 6935 case RESTART_ARRAY_RW: 6936 err = restart_array(mddev); 6937 goto unlock; 6938 6939 case STOP_ARRAY: 6940 err = do_md_stop(mddev, 0, bdev); 6941 goto unlock; 6942 6943 case STOP_ARRAY_RO: 6944 err = md_set_readonly(mddev, bdev); 6945 goto unlock; 6946 6947 case HOT_REMOVE_DISK: 6948 err = hot_remove_disk(mddev, new_decode_dev(arg)); 6949 goto unlock; 6950 6951 case ADD_NEW_DISK: 6952 /* We can support ADD_NEW_DISK on read-only arrays 6953 * only if we are re-adding a preexisting device. 6954 * So require mddev->pers and MD_DISK_SYNC. 6955 */ 6956 if (mddev->pers) { 6957 mdu_disk_info_t info; 6958 if (copy_from_user(&info, argp, sizeof(info))) 6959 err = -EFAULT; 6960 else if (!(info.state & (1<<MD_DISK_SYNC))) 6961 /* Need to clear read-only for this */ 6962 break; 6963 else 6964 err = add_new_disk(mddev, &info); 6965 goto unlock; 6966 } 6967 break; 6968 6969 case BLKROSET: 6970 if (get_user(ro, (int __user *)(arg))) { 6971 err = -EFAULT; 6972 goto unlock; 6973 } 6974 err = -EINVAL; 6975 6976 /* if the bdev is going readonly the value of mddev->ro 6977 * does not matter, no writes are coming 6978 */ 6979 if (ro) 6980 goto unlock; 6981 6982 /* are we are already prepared for writes? */ 6983 if (mddev->ro != 1) 6984 goto unlock; 6985 6986 /* transitioning to readauto need only happen for 6987 * arrays that call md_write_start 6988 */ 6989 if (mddev->pers) { 6990 err = restart_array(mddev); 6991 if (err == 0) { 6992 mddev->ro = 2; 6993 set_disk_ro(mddev->gendisk, 0); 6994 } 6995 } 6996 goto unlock; 6997 } 6998 6999 /* 7000 * The remaining ioctls are changing the state of the 7001 * superblock, so we do not allow them on read-only arrays. 7002 */ 7003 if (mddev->ro && mddev->pers) { 7004 if (mddev->ro == 2) { 7005 mddev->ro = 0; 7006 sysfs_notify_dirent_safe(mddev->sysfs_state); 7007 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7008 /* mddev_unlock will wake thread */ 7009 /* If a device failed while we were read-only, we 7010 * need to make sure the metadata is updated now. 7011 */ 7012 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) { 7013 mddev_unlock(mddev); 7014 wait_event(mddev->sb_wait, 7015 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) && 7016 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); 7017 mddev_lock_nointr(mddev); 7018 } 7019 } else { 7020 err = -EROFS; 7021 goto unlock; 7022 } 7023 } 7024 7025 switch (cmd) { 7026 case ADD_NEW_DISK: 7027 { 7028 mdu_disk_info_t info; 7029 if (copy_from_user(&info, argp, sizeof(info))) 7030 err = -EFAULT; 7031 else 7032 err = add_new_disk(mddev, &info); 7033 goto unlock; 7034 } 7035 7036 case CLUSTERED_DISK_NACK: 7037 if (mddev_is_clustered(mddev)) 7038 md_cluster_ops->new_disk_ack(mddev, false); 7039 else 7040 err = -EINVAL; 7041 goto unlock; 7042 7043 case HOT_ADD_DISK: 7044 err = hot_add_disk(mddev, new_decode_dev(arg)); 7045 goto unlock; 7046 7047 case RUN_ARRAY: 7048 err = do_md_run(mddev); 7049 goto unlock; 7050 7051 case SET_BITMAP_FILE: 7052 err = set_bitmap_file(mddev, (int)arg); 7053 goto unlock; 7054 7055 default: 7056 err = -EINVAL; 7057 goto unlock; 7058 } 7059 7060 unlock: 7061 if (mddev->hold_active == UNTIL_IOCTL && 7062 err != -EINVAL) 7063 mddev->hold_active = 0; 7064 mddev_unlock(mddev); 7065 out: 7066 return err; 7067 } 7068 #ifdef CONFIG_COMPAT 7069 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, 7070 unsigned int cmd, unsigned long arg) 7071 { 7072 switch (cmd) { 7073 case HOT_REMOVE_DISK: 7074 case HOT_ADD_DISK: 7075 case SET_DISK_FAULTY: 7076 case SET_BITMAP_FILE: 7077 /* These take in integer arg, do not convert */ 7078 break; 7079 default: 7080 arg = (unsigned long)compat_ptr(arg); 7081 break; 7082 } 7083 7084 return md_ioctl(bdev, mode, cmd, arg); 7085 } 7086 #endif /* CONFIG_COMPAT */ 7087 7088 static int md_open(struct block_device *bdev, fmode_t mode) 7089 { 7090 /* 7091 * Succeed if we can lock the mddev, which confirms that 7092 * it isn't being stopped right now. 7093 */ 7094 struct mddev *mddev = mddev_find(bdev->bd_dev); 7095 int err; 7096 7097 if (!mddev) 7098 return -ENODEV; 7099 7100 if (mddev->gendisk != bdev->bd_disk) { 7101 /* we are racing with mddev_put which is discarding this 7102 * bd_disk. 7103 */ 7104 mddev_put(mddev); 7105 /* Wait until bdev->bd_disk is definitely gone */ 7106 flush_workqueue(md_misc_wq); 7107 /* Then retry the open from the top */ 7108 return -ERESTARTSYS; 7109 } 7110 BUG_ON(mddev != bdev->bd_disk->private_data); 7111 7112 if ((err = mutex_lock_interruptible(&mddev->open_mutex))) 7113 goto out; 7114 7115 if (test_bit(MD_CLOSING, &mddev->flags)) { 7116 mutex_unlock(&mddev->open_mutex); 7117 err = -ENODEV; 7118 goto out; 7119 } 7120 7121 err = 0; 7122 atomic_inc(&mddev->openers); 7123 mutex_unlock(&mddev->open_mutex); 7124 7125 check_disk_change(bdev); 7126 out: 7127 if (err) 7128 mddev_put(mddev); 7129 return err; 7130 } 7131 7132 static void md_release(struct gendisk *disk, fmode_t mode) 7133 { 7134 struct mddev *mddev = disk->private_data; 7135 7136 BUG_ON(!mddev); 7137 atomic_dec(&mddev->openers); 7138 mddev_put(mddev); 7139 } 7140 7141 static int md_media_changed(struct gendisk *disk) 7142 { 7143 struct mddev *mddev = disk->private_data; 7144 7145 return mddev->changed; 7146 } 7147 7148 static int md_revalidate(struct gendisk *disk) 7149 { 7150 struct mddev *mddev = disk->private_data; 7151 7152 mddev->changed = 0; 7153 return 0; 7154 } 7155 static const struct block_device_operations md_fops = 7156 { 7157 .owner = THIS_MODULE, 7158 .open = md_open, 7159 .release = md_release, 7160 .ioctl = md_ioctl, 7161 #ifdef CONFIG_COMPAT 7162 .compat_ioctl = md_compat_ioctl, 7163 #endif 7164 .getgeo = md_getgeo, 7165 .media_changed = md_media_changed, 7166 .revalidate_disk= md_revalidate, 7167 }; 7168 7169 static int md_thread(void *arg) 7170 { 7171 struct md_thread *thread = arg; 7172 7173 /* 7174 * md_thread is a 'system-thread', it's priority should be very 7175 * high. We avoid resource deadlocks individually in each 7176 * raid personality. (RAID5 does preallocation) We also use RR and 7177 * the very same RT priority as kswapd, thus we will never get 7178 * into a priority inversion deadlock. 7179 * 7180 * we definitely have to have equal or higher priority than 7181 * bdflush, otherwise bdflush will deadlock if there are too 7182 * many dirty RAID5 blocks. 7183 */ 7184 7185 allow_signal(SIGKILL); 7186 while (!kthread_should_stop()) { 7187 7188 /* We need to wait INTERRUPTIBLE so that 7189 * we don't add to the load-average. 7190 * That means we need to be sure no signals are 7191 * pending 7192 */ 7193 if (signal_pending(current)) 7194 flush_signals(current); 7195 7196 wait_event_interruptible_timeout 7197 (thread->wqueue, 7198 test_bit(THREAD_WAKEUP, &thread->flags) 7199 || kthread_should_stop() || kthread_should_park(), 7200 thread->timeout); 7201 7202 clear_bit(THREAD_WAKEUP, &thread->flags); 7203 if (kthread_should_park()) 7204 kthread_parkme(); 7205 if (!kthread_should_stop()) 7206 thread->run(thread); 7207 } 7208 7209 return 0; 7210 } 7211 7212 void md_wakeup_thread(struct md_thread *thread) 7213 { 7214 if (thread) { 7215 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); 7216 set_bit(THREAD_WAKEUP, &thread->flags); 7217 wake_up(&thread->wqueue); 7218 } 7219 } 7220 EXPORT_SYMBOL(md_wakeup_thread); 7221 7222 struct md_thread *md_register_thread(void (*run) (struct md_thread *), 7223 struct mddev *mddev, const char *name) 7224 { 7225 struct md_thread *thread; 7226 7227 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); 7228 if (!thread) 7229 return NULL; 7230 7231 init_waitqueue_head(&thread->wqueue); 7232 7233 thread->run = run; 7234 thread->mddev = mddev; 7235 thread->timeout = MAX_SCHEDULE_TIMEOUT; 7236 thread->tsk = kthread_run(md_thread, thread, 7237 "%s_%s", 7238 mdname(thread->mddev), 7239 name); 7240 if (IS_ERR(thread->tsk)) { 7241 kfree(thread); 7242 return NULL; 7243 } 7244 return thread; 7245 } 7246 EXPORT_SYMBOL(md_register_thread); 7247 7248 void md_unregister_thread(struct md_thread **threadp) 7249 { 7250 struct md_thread *thread = *threadp; 7251 if (!thread) 7252 return; 7253 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); 7254 /* Locking ensures that mddev_unlock does not wake_up a 7255 * non-existent thread 7256 */ 7257 spin_lock(&pers_lock); 7258 *threadp = NULL; 7259 spin_unlock(&pers_lock); 7260 7261 kthread_stop(thread->tsk); 7262 kfree(thread); 7263 } 7264 EXPORT_SYMBOL(md_unregister_thread); 7265 7266 void md_error(struct mddev *mddev, struct md_rdev *rdev) 7267 { 7268 if (!rdev || test_bit(Faulty, &rdev->flags)) 7269 return; 7270 7271 if (!mddev->pers || !mddev->pers->error_handler) 7272 return; 7273 mddev->pers->error_handler(mddev,rdev); 7274 if (mddev->degraded) 7275 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7276 sysfs_notify_dirent_safe(rdev->sysfs_state); 7277 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7278 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7279 md_wakeup_thread(mddev->thread); 7280 if (mddev->event_work.func) 7281 queue_work(md_misc_wq, &mddev->event_work); 7282 md_new_event(mddev); 7283 } 7284 EXPORT_SYMBOL(md_error); 7285 7286 /* seq_file implementation /proc/mdstat */ 7287 7288 static void status_unused(struct seq_file *seq) 7289 { 7290 int i = 0; 7291 struct md_rdev *rdev; 7292 7293 seq_printf(seq, "unused devices: "); 7294 7295 list_for_each_entry(rdev, &pending_raid_disks, same_set) { 7296 char b[BDEVNAME_SIZE]; 7297 i++; 7298 seq_printf(seq, "%s ", 7299 bdevname(rdev->bdev,b)); 7300 } 7301 if (!i) 7302 seq_printf(seq, "<none>"); 7303 7304 seq_printf(seq, "\n"); 7305 } 7306 7307 static int status_resync(struct seq_file *seq, struct mddev *mddev) 7308 { 7309 sector_t max_sectors, resync, res; 7310 unsigned long dt, db; 7311 sector_t rt; 7312 int scale; 7313 unsigned int per_milli; 7314 7315 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 7316 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7317 max_sectors = mddev->resync_max_sectors; 7318 else 7319 max_sectors = mddev->dev_sectors; 7320 7321 resync = mddev->curr_resync; 7322 if (resync <= 3) { 7323 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 7324 /* Still cleaning up */ 7325 resync = max_sectors; 7326 } else 7327 resync -= atomic_read(&mddev->recovery_active); 7328 7329 if (resync == 0) { 7330 if (mddev->recovery_cp < MaxSector) { 7331 seq_printf(seq, "\tresync=PENDING"); 7332 return 1; 7333 } 7334 return 0; 7335 } 7336 if (resync < 3) { 7337 seq_printf(seq, "\tresync=DELAYED"); 7338 return 1; 7339 } 7340 7341 WARN_ON(max_sectors == 0); 7342 /* Pick 'scale' such that (resync>>scale)*1000 will fit 7343 * in a sector_t, and (max_sectors>>scale) will fit in a 7344 * u32, as those are the requirements for sector_div. 7345 * Thus 'scale' must be at least 10 7346 */ 7347 scale = 10; 7348 if (sizeof(sector_t) > sizeof(unsigned long)) { 7349 while ( max_sectors/2 > (1ULL<<(scale+32))) 7350 scale++; 7351 } 7352 res = (resync>>scale)*1000; 7353 sector_div(res, (u32)((max_sectors>>scale)+1)); 7354 7355 per_milli = res; 7356 { 7357 int i, x = per_milli/50, y = 20-x; 7358 seq_printf(seq, "["); 7359 for (i = 0; i < x; i++) 7360 seq_printf(seq, "="); 7361 seq_printf(seq, ">"); 7362 for (i = 0; i < y; i++) 7363 seq_printf(seq, "."); 7364 seq_printf(seq, "] "); 7365 } 7366 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", 7367 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? 7368 "reshape" : 7369 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? 7370 "check" : 7371 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 7372 "resync" : "recovery"))), 7373 per_milli/10, per_milli % 10, 7374 (unsigned long long) resync/2, 7375 (unsigned long long) max_sectors/2); 7376 7377 /* 7378 * dt: time from mark until now 7379 * db: blocks written from mark until now 7380 * rt: remaining time 7381 * 7382 * rt is a sector_t, so could be 32bit or 64bit. 7383 * So we divide before multiply in case it is 32bit and close 7384 * to the limit. 7385 * We scale the divisor (db) by 32 to avoid losing precision 7386 * near the end of resync when the number of remaining sectors 7387 * is close to 'db'. 7388 * We then divide rt by 32 after multiplying by db to compensate. 7389 * The '+1' avoids division by zero if db is very small. 7390 */ 7391 dt = ((jiffies - mddev->resync_mark) / HZ); 7392 if (!dt) dt++; 7393 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) 7394 - mddev->resync_mark_cnt; 7395 7396 rt = max_sectors - resync; /* number of remaining sectors */ 7397 sector_div(rt, db/32+1); 7398 rt *= dt; 7399 rt >>= 5; 7400 7401 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, 7402 ((unsigned long)rt % 60)/6); 7403 7404 seq_printf(seq, " speed=%ldK/sec", db/2/dt); 7405 return 1; 7406 } 7407 7408 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 7409 { 7410 struct list_head *tmp; 7411 loff_t l = *pos; 7412 struct mddev *mddev; 7413 7414 if (l >= 0x10000) 7415 return NULL; 7416 if (!l--) 7417 /* header */ 7418 return (void*)1; 7419 7420 spin_lock(&all_mddevs_lock); 7421 list_for_each(tmp,&all_mddevs) 7422 if (!l--) { 7423 mddev = list_entry(tmp, struct mddev, all_mddevs); 7424 mddev_get(mddev); 7425 spin_unlock(&all_mddevs_lock); 7426 return mddev; 7427 } 7428 spin_unlock(&all_mddevs_lock); 7429 if (!l--) 7430 return (void*)2;/* tail */ 7431 return NULL; 7432 } 7433 7434 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 7435 { 7436 struct list_head *tmp; 7437 struct mddev *next_mddev, *mddev = v; 7438 7439 ++*pos; 7440 if (v == (void*)2) 7441 return NULL; 7442 7443 spin_lock(&all_mddevs_lock); 7444 if (v == (void*)1) 7445 tmp = all_mddevs.next; 7446 else 7447 tmp = mddev->all_mddevs.next; 7448 if (tmp != &all_mddevs) 7449 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); 7450 else { 7451 next_mddev = (void*)2; 7452 *pos = 0x10000; 7453 } 7454 spin_unlock(&all_mddevs_lock); 7455 7456 if (v != (void*)1) 7457 mddev_put(mddev); 7458 return next_mddev; 7459 7460 } 7461 7462 static void md_seq_stop(struct seq_file *seq, void *v) 7463 { 7464 struct mddev *mddev = v; 7465 7466 if (mddev && v != (void*)1 && v != (void*)2) 7467 mddev_put(mddev); 7468 } 7469 7470 static int md_seq_show(struct seq_file *seq, void *v) 7471 { 7472 struct mddev *mddev = v; 7473 sector_t sectors; 7474 struct md_rdev *rdev; 7475 7476 if (v == (void*)1) { 7477 struct md_personality *pers; 7478 seq_printf(seq, "Personalities : "); 7479 spin_lock(&pers_lock); 7480 list_for_each_entry(pers, &pers_list, list) 7481 seq_printf(seq, "[%s] ", pers->name); 7482 7483 spin_unlock(&pers_lock); 7484 seq_printf(seq, "\n"); 7485 seq->poll_event = atomic_read(&md_event_count); 7486 return 0; 7487 } 7488 if (v == (void*)2) { 7489 status_unused(seq); 7490 return 0; 7491 } 7492 7493 spin_lock(&mddev->lock); 7494 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 7495 seq_printf(seq, "%s : %sactive", mdname(mddev), 7496 mddev->pers ? "" : "in"); 7497 if (mddev->pers) { 7498 if (mddev->ro==1) 7499 seq_printf(seq, " (read-only)"); 7500 if (mddev->ro==2) 7501 seq_printf(seq, " (auto-read-only)"); 7502 seq_printf(seq, " %s", mddev->pers->name); 7503 } 7504 7505 sectors = 0; 7506 rcu_read_lock(); 7507 rdev_for_each_rcu(rdev, mddev) { 7508 char b[BDEVNAME_SIZE]; 7509 seq_printf(seq, " %s[%d]", 7510 bdevname(rdev->bdev,b), rdev->desc_nr); 7511 if (test_bit(WriteMostly, &rdev->flags)) 7512 seq_printf(seq, "(W)"); 7513 if (test_bit(Journal, &rdev->flags)) 7514 seq_printf(seq, "(J)"); 7515 if (test_bit(Faulty, &rdev->flags)) { 7516 seq_printf(seq, "(F)"); 7517 continue; 7518 } 7519 if (rdev->raid_disk < 0) 7520 seq_printf(seq, "(S)"); /* spare */ 7521 if (test_bit(Replacement, &rdev->flags)) 7522 seq_printf(seq, "(R)"); 7523 sectors += rdev->sectors; 7524 } 7525 rcu_read_unlock(); 7526 7527 if (!list_empty(&mddev->disks)) { 7528 if (mddev->pers) 7529 seq_printf(seq, "\n %llu blocks", 7530 (unsigned long long) 7531 mddev->array_sectors / 2); 7532 else 7533 seq_printf(seq, "\n %llu blocks", 7534 (unsigned long long)sectors / 2); 7535 } 7536 if (mddev->persistent) { 7537 if (mddev->major_version != 0 || 7538 mddev->minor_version != 90) { 7539 seq_printf(seq," super %d.%d", 7540 mddev->major_version, 7541 mddev->minor_version); 7542 } 7543 } else if (mddev->external) 7544 seq_printf(seq, " super external:%s", 7545 mddev->metadata_type); 7546 else 7547 seq_printf(seq, " super non-persistent"); 7548 7549 if (mddev->pers) { 7550 mddev->pers->status(seq, mddev); 7551 seq_printf(seq, "\n "); 7552 if (mddev->pers->sync_request) { 7553 if (status_resync(seq, mddev)) 7554 seq_printf(seq, "\n "); 7555 } 7556 } else 7557 seq_printf(seq, "\n "); 7558 7559 bitmap_status(seq, mddev->bitmap); 7560 7561 seq_printf(seq, "\n"); 7562 } 7563 spin_unlock(&mddev->lock); 7564 7565 return 0; 7566 } 7567 7568 static const struct seq_operations md_seq_ops = { 7569 .start = md_seq_start, 7570 .next = md_seq_next, 7571 .stop = md_seq_stop, 7572 .show = md_seq_show, 7573 }; 7574 7575 static int md_seq_open(struct inode *inode, struct file *file) 7576 { 7577 struct seq_file *seq; 7578 int error; 7579 7580 error = seq_open(file, &md_seq_ops); 7581 if (error) 7582 return error; 7583 7584 seq = file->private_data; 7585 seq->poll_event = atomic_read(&md_event_count); 7586 return error; 7587 } 7588 7589 static int md_unloading; 7590 static unsigned int mdstat_poll(struct file *filp, poll_table *wait) 7591 { 7592 struct seq_file *seq = filp->private_data; 7593 int mask; 7594 7595 if (md_unloading) 7596 return POLLIN|POLLRDNORM|POLLERR|POLLPRI; 7597 poll_wait(filp, &md_event_waiters, wait); 7598 7599 /* always allow read */ 7600 mask = POLLIN | POLLRDNORM; 7601 7602 if (seq->poll_event != atomic_read(&md_event_count)) 7603 mask |= POLLERR | POLLPRI; 7604 return mask; 7605 } 7606 7607 static const struct file_operations md_seq_fops = { 7608 .owner = THIS_MODULE, 7609 .open = md_seq_open, 7610 .read = seq_read, 7611 .llseek = seq_lseek, 7612 .release = seq_release_private, 7613 .poll = mdstat_poll, 7614 }; 7615 7616 int register_md_personality(struct md_personality *p) 7617 { 7618 pr_debug("md: %s personality registered for level %d\n", 7619 p->name, p->level); 7620 spin_lock(&pers_lock); 7621 list_add_tail(&p->list, &pers_list); 7622 spin_unlock(&pers_lock); 7623 return 0; 7624 } 7625 EXPORT_SYMBOL(register_md_personality); 7626 7627 int unregister_md_personality(struct md_personality *p) 7628 { 7629 pr_debug("md: %s personality unregistered\n", p->name); 7630 spin_lock(&pers_lock); 7631 list_del_init(&p->list); 7632 spin_unlock(&pers_lock); 7633 return 0; 7634 } 7635 EXPORT_SYMBOL(unregister_md_personality); 7636 7637 int register_md_cluster_operations(struct md_cluster_operations *ops, 7638 struct module *module) 7639 { 7640 int ret = 0; 7641 spin_lock(&pers_lock); 7642 if (md_cluster_ops != NULL) 7643 ret = -EALREADY; 7644 else { 7645 md_cluster_ops = ops; 7646 md_cluster_mod = module; 7647 } 7648 spin_unlock(&pers_lock); 7649 return ret; 7650 } 7651 EXPORT_SYMBOL(register_md_cluster_operations); 7652 7653 int unregister_md_cluster_operations(void) 7654 { 7655 spin_lock(&pers_lock); 7656 md_cluster_ops = NULL; 7657 spin_unlock(&pers_lock); 7658 return 0; 7659 } 7660 EXPORT_SYMBOL(unregister_md_cluster_operations); 7661 7662 int md_setup_cluster(struct mddev *mddev, int nodes) 7663 { 7664 if (!md_cluster_ops) 7665 request_module("md-cluster"); 7666 spin_lock(&pers_lock); 7667 /* ensure module won't be unloaded */ 7668 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { 7669 pr_warn("can't find md-cluster module or get it's reference.\n"); 7670 spin_unlock(&pers_lock); 7671 return -ENOENT; 7672 } 7673 spin_unlock(&pers_lock); 7674 7675 return md_cluster_ops->join(mddev, nodes); 7676 } 7677 7678 void md_cluster_stop(struct mddev *mddev) 7679 { 7680 if (!md_cluster_ops) 7681 return; 7682 md_cluster_ops->leave(mddev); 7683 module_put(md_cluster_mod); 7684 } 7685 7686 static int is_mddev_idle(struct mddev *mddev, int init) 7687 { 7688 struct md_rdev *rdev; 7689 int idle; 7690 int curr_events; 7691 7692 idle = 1; 7693 rcu_read_lock(); 7694 rdev_for_each_rcu(rdev, mddev) { 7695 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 7696 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 7697 (int)part_stat_read(&disk->part0, sectors[1]) - 7698 atomic_read(&disk->sync_io); 7699 /* sync IO will cause sync_io to increase before the disk_stats 7700 * as sync_io is counted when a request starts, and 7701 * disk_stats is counted when it completes. 7702 * So resync activity will cause curr_events to be smaller than 7703 * when there was no such activity. 7704 * non-sync IO will cause disk_stat to increase without 7705 * increasing sync_io so curr_events will (eventually) 7706 * be larger than it was before. Once it becomes 7707 * substantially larger, the test below will cause 7708 * the array to appear non-idle, and resync will slow 7709 * down. 7710 * If there is a lot of outstanding resync activity when 7711 * we set last_event to curr_events, then all that activity 7712 * completing might cause the array to appear non-idle 7713 * and resync will be slowed down even though there might 7714 * not have been non-resync activity. This will only 7715 * happen once though. 'last_events' will soon reflect 7716 * the state where there is little or no outstanding 7717 * resync requests, and further resync activity will 7718 * always make curr_events less than last_events. 7719 * 7720 */ 7721 if (init || curr_events - rdev->last_events > 64) { 7722 rdev->last_events = curr_events; 7723 idle = 0; 7724 } 7725 } 7726 rcu_read_unlock(); 7727 return idle; 7728 } 7729 7730 void md_done_sync(struct mddev *mddev, int blocks, int ok) 7731 { 7732 /* another "blocks" (512byte) blocks have been synced */ 7733 atomic_sub(blocks, &mddev->recovery_active); 7734 wake_up(&mddev->recovery_wait); 7735 if (!ok) { 7736 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7737 set_bit(MD_RECOVERY_ERROR, &mddev->recovery); 7738 md_wakeup_thread(mddev->thread); 7739 // stop recovery, signal do_sync .... 7740 } 7741 } 7742 EXPORT_SYMBOL(md_done_sync); 7743 7744 /* md_write_start(mddev, bi) 7745 * If we need to update some array metadata (e.g. 'active' flag 7746 * in superblock) before writing, schedule a superblock update 7747 * and wait for it to complete. 7748 */ 7749 void md_write_start(struct mddev *mddev, struct bio *bi) 7750 { 7751 int did_change = 0; 7752 if (bio_data_dir(bi) != WRITE) 7753 return; 7754 7755 BUG_ON(mddev->ro == 1); 7756 if (mddev->ro == 2) { 7757 /* need to switch to read/write */ 7758 mddev->ro = 0; 7759 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7760 md_wakeup_thread(mddev->thread); 7761 md_wakeup_thread(mddev->sync_thread); 7762 did_change = 1; 7763 } 7764 atomic_inc(&mddev->writes_pending); 7765 if (mddev->safemode == 1) 7766 mddev->safemode = 0; 7767 if (mddev->in_sync) { 7768 spin_lock(&mddev->lock); 7769 if (mddev->in_sync) { 7770 mddev->in_sync = 0; 7771 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 7772 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 7773 md_wakeup_thread(mddev->thread); 7774 did_change = 1; 7775 } 7776 spin_unlock(&mddev->lock); 7777 } 7778 if (did_change) 7779 sysfs_notify_dirent_safe(mddev->sysfs_state); 7780 wait_event(mddev->sb_wait, 7781 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); 7782 } 7783 EXPORT_SYMBOL(md_write_start); 7784 7785 void md_write_end(struct mddev *mddev) 7786 { 7787 if (atomic_dec_and_test(&mddev->writes_pending)) { 7788 if (mddev->safemode == 2) 7789 md_wakeup_thread(mddev->thread); 7790 else if (mddev->safemode_delay) 7791 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 7792 } 7793 } 7794 EXPORT_SYMBOL(md_write_end); 7795 7796 /* md_allow_write(mddev) 7797 * Calling this ensures that the array is marked 'active' so that writes 7798 * may proceed without blocking. It is important to call this before 7799 * attempting a GFP_KERNEL allocation while holding the mddev lock. 7800 * Must be called with mddev_lock held. 7801 * 7802 * In the ->external case MD_SB_CHANGE_PENDING can not be cleared until mddev->lock 7803 * is dropped, so return -EAGAIN after notifying userspace. 7804 */ 7805 int md_allow_write(struct mddev *mddev) 7806 { 7807 if (!mddev->pers) 7808 return 0; 7809 if (mddev->ro) 7810 return 0; 7811 if (!mddev->pers->sync_request) 7812 return 0; 7813 7814 spin_lock(&mddev->lock); 7815 if (mddev->in_sync) { 7816 mddev->in_sync = 0; 7817 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 7818 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 7819 if (mddev->safemode_delay && 7820 mddev->safemode == 0) 7821 mddev->safemode = 1; 7822 spin_unlock(&mddev->lock); 7823 md_update_sb(mddev, 0); 7824 sysfs_notify_dirent_safe(mddev->sysfs_state); 7825 } else 7826 spin_unlock(&mddev->lock); 7827 7828 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 7829 return -EAGAIN; 7830 else 7831 return 0; 7832 } 7833 EXPORT_SYMBOL_GPL(md_allow_write); 7834 7835 #define SYNC_MARKS 10 7836 #define SYNC_MARK_STEP (3*HZ) 7837 #define UPDATE_FREQUENCY (5*60*HZ) 7838 void md_do_sync(struct md_thread *thread) 7839 { 7840 struct mddev *mddev = thread->mddev; 7841 struct mddev *mddev2; 7842 unsigned int currspeed = 0, 7843 window; 7844 sector_t max_sectors,j, io_sectors, recovery_done; 7845 unsigned long mark[SYNC_MARKS]; 7846 unsigned long update_time; 7847 sector_t mark_cnt[SYNC_MARKS]; 7848 int last_mark,m; 7849 struct list_head *tmp; 7850 sector_t last_check; 7851 int skipped = 0; 7852 struct md_rdev *rdev; 7853 char *desc, *action = NULL; 7854 struct blk_plug plug; 7855 int ret; 7856 7857 /* just incase thread restarts... */ 7858 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 7859 return; 7860 if (mddev->ro) {/* never try to sync a read-only array */ 7861 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7862 return; 7863 } 7864 7865 if (mddev_is_clustered(mddev)) { 7866 ret = md_cluster_ops->resync_start(mddev); 7867 if (ret) 7868 goto skip; 7869 7870 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags); 7871 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 7872 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || 7873 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) 7874 && ((unsigned long long)mddev->curr_resync_completed 7875 < (unsigned long long)mddev->resync_max_sectors)) 7876 goto skip; 7877 } 7878 7879 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7880 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 7881 desc = "data-check"; 7882 action = "check"; 7883 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 7884 desc = "requested-resync"; 7885 action = "repair"; 7886 } else 7887 desc = "resync"; 7888 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7889 desc = "reshape"; 7890 else 7891 desc = "recovery"; 7892 7893 mddev->last_sync_action = action ?: desc; 7894 7895 /* we overload curr_resync somewhat here. 7896 * 0 == not engaged in resync at all 7897 * 2 == checking that there is no conflict with another sync 7898 * 1 == like 2, but have yielded to allow conflicting resync to 7899 * commense 7900 * other == active in resync - this many blocks 7901 * 7902 * Before starting a resync we must have set curr_resync to 7903 * 2, and then checked that every "conflicting" array has curr_resync 7904 * less than ours. When we find one that is the same or higher 7905 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 7906 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 7907 * This will mean we have to start checking from the beginning again. 7908 * 7909 */ 7910 7911 do { 7912 int mddev2_minor = -1; 7913 mddev->curr_resync = 2; 7914 7915 try_again: 7916 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7917 goto skip; 7918 for_each_mddev(mddev2, tmp) { 7919 if (mddev2 == mddev) 7920 continue; 7921 if (!mddev->parallel_resync 7922 && mddev2->curr_resync 7923 && match_mddev_units(mddev, mddev2)) { 7924 DEFINE_WAIT(wq); 7925 if (mddev < mddev2 && mddev->curr_resync == 2) { 7926 /* arbitrarily yield */ 7927 mddev->curr_resync = 1; 7928 wake_up(&resync_wait); 7929 } 7930 if (mddev > mddev2 && mddev->curr_resync == 1) 7931 /* no need to wait here, we can wait the next 7932 * time 'round when curr_resync == 2 7933 */ 7934 continue; 7935 /* We need to wait 'interruptible' so as not to 7936 * contribute to the load average, and not to 7937 * be caught by 'softlockup' 7938 */ 7939 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); 7940 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 7941 mddev2->curr_resync >= mddev->curr_resync) { 7942 if (mddev2_minor != mddev2->md_minor) { 7943 mddev2_minor = mddev2->md_minor; 7944 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n", 7945 desc, mdname(mddev), 7946 mdname(mddev2)); 7947 } 7948 mddev_put(mddev2); 7949 if (signal_pending(current)) 7950 flush_signals(current); 7951 schedule(); 7952 finish_wait(&resync_wait, &wq); 7953 goto try_again; 7954 } 7955 finish_wait(&resync_wait, &wq); 7956 } 7957 } 7958 } while (mddev->curr_resync < 2); 7959 7960 j = 0; 7961 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7962 /* resync follows the size requested by the personality, 7963 * which defaults to physical size, but can be virtual size 7964 */ 7965 max_sectors = mddev->resync_max_sectors; 7966 atomic64_set(&mddev->resync_mismatches, 0); 7967 /* we don't use the checkpoint if there's a bitmap */ 7968 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7969 j = mddev->resync_min; 7970 else if (!mddev->bitmap) 7971 j = mddev->recovery_cp; 7972 7973 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7974 max_sectors = mddev->resync_max_sectors; 7975 else { 7976 /* recovery follows the physical size of devices */ 7977 max_sectors = mddev->dev_sectors; 7978 j = MaxSector; 7979 rcu_read_lock(); 7980 rdev_for_each_rcu(rdev, mddev) 7981 if (rdev->raid_disk >= 0 && 7982 !test_bit(Journal, &rdev->flags) && 7983 !test_bit(Faulty, &rdev->flags) && 7984 !test_bit(In_sync, &rdev->flags) && 7985 rdev->recovery_offset < j) 7986 j = rdev->recovery_offset; 7987 rcu_read_unlock(); 7988 7989 /* If there is a bitmap, we need to make sure all 7990 * writes that started before we added a spare 7991 * complete before we start doing a recovery. 7992 * Otherwise the write might complete and (via 7993 * bitmap_endwrite) set a bit in the bitmap after the 7994 * recovery has checked that bit and skipped that 7995 * region. 7996 */ 7997 if (mddev->bitmap) { 7998 mddev->pers->quiesce(mddev, 1); 7999 mddev->pers->quiesce(mddev, 0); 8000 } 8001 } 8002 8003 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev)); 8004 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev)); 8005 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n", 8006 speed_max(mddev), desc); 8007 8008 is_mddev_idle(mddev, 1); /* this initializes IO event counters */ 8009 8010 io_sectors = 0; 8011 for (m = 0; m < SYNC_MARKS; m++) { 8012 mark[m] = jiffies; 8013 mark_cnt[m] = io_sectors; 8014 } 8015 last_mark = 0; 8016 mddev->resync_mark = mark[last_mark]; 8017 mddev->resync_mark_cnt = mark_cnt[last_mark]; 8018 8019 /* 8020 * Tune reconstruction: 8021 */ 8022 window = 32*(PAGE_SIZE/512); 8023 pr_debug("md: using %dk window, over a total of %lluk.\n", 8024 window/2, (unsigned long long)max_sectors/2); 8025 8026 atomic_set(&mddev->recovery_active, 0); 8027 last_check = 0; 8028 8029 if (j>2) { 8030 pr_debug("md: resuming %s of %s from checkpoint.\n", 8031 desc, mdname(mddev)); 8032 mddev->curr_resync = j; 8033 } else 8034 mddev->curr_resync = 3; /* no longer delayed */ 8035 mddev->curr_resync_completed = j; 8036 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 8037 md_new_event(mddev); 8038 update_time = jiffies; 8039 8040 blk_start_plug(&plug); 8041 while (j < max_sectors) { 8042 sector_t sectors; 8043 8044 skipped = 0; 8045 8046 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8047 ((mddev->curr_resync > mddev->curr_resync_completed && 8048 (mddev->curr_resync - mddev->curr_resync_completed) 8049 > (max_sectors >> 4)) || 8050 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || 8051 (j - mddev->curr_resync_completed)*2 8052 >= mddev->resync_max - mddev->curr_resync_completed || 8053 mddev->curr_resync_completed > mddev->resync_max 8054 )) { 8055 /* time to update curr_resync_completed */ 8056 wait_event(mddev->recovery_wait, 8057 atomic_read(&mddev->recovery_active) == 0); 8058 mddev->curr_resync_completed = j; 8059 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 8060 j > mddev->recovery_cp) 8061 mddev->recovery_cp = j; 8062 update_time = jiffies; 8063 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 8064 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 8065 } 8066 8067 while (j >= mddev->resync_max && 8068 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 8069 /* As this condition is controlled by user-space, 8070 * we can block indefinitely, so use '_interruptible' 8071 * to avoid triggering warnings. 8072 */ 8073 flush_signals(current); /* just in case */ 8074 wait_event_interruptible(mddev->recovery_wait, 8075 mddev->resync_max > j 8076 || test_bit(MD_RECOVERY_INTR, 8077 &mddev->recovery)); 8078 } 8079 8080 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8081 break; 8082 8083 sectors = mddev->pers->sync_request(mddev, j, &skipped); 8084 if (sectors == 0) { 8085 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 8086 break; 8087 } 8088 8089 if (!skipped) { /* actual IO requested */ 8090 io_sectors += sectors; 8091 atomic_add(sectors, &mddev->recovery_active); 8092 } 8093 8094 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8095 break; 8096 8097 j += sectors; 8098 if (j > max_sectors) 8099 /* when skipping, extra large numbers can be returned. */ 8100 j = max_sectors; 8101 if (j > 2) 8102 mddev->curr_resync = j; 8103 mddev->curr_mark_cnt = io_sectors; 8104 if (last_check == 0) 8105 /* this is the earliest that rebuild will be 8106 * visible in /proc/mdstat 8107 */ 8108 md_new_event(mddev); 8109 8110 if (last_check + window > io_sectors || j == max_sectors) 8111 continue; 8112 8113 last_check = io_sectors; 8114 repeat: 8115 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 8116 /* step marks */ 8117 int next = (last_mark+1) % SYNC_MARKS; 8118 8119 mddev->resync_mark = mark[next]; 8120 mddev->resync_mark_cnt = mark_cnt[next]; 8121 mark[next] = jiffies; 8122 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 8123 last_mark = next; 8124 } 8125 8126 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8127 break; 8128 8129 /* 8130 * this loop exits only if either when we are slower than 8131 * the 'hard' speed limit, or the system was IO-idle for 8132 * a jiffy. 8133 * the system might be non-idle CPU-wise, but we only care 8134 * about not overloading the IO subsystem. (things like an 8135 * e2fsck being done on the RAID array should execute fast) 8136 */ 8137 cond_resched(); 8138 8139 recovery_done = io_sectors - atomic_read(&mddev->recovery_active); 8140 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 8141 /((jiffies-mddev->resync_mark)/HZ +1) +1; 8142 8143 if (currspeed > speed_min(mddev)) { 8144 if (currspeed > speed_max(mddev)) { 8145 msleep(500); 8146 goto repeat; 8147 } 8148 if (!is_mddev_idle(mddev, 0)) { 8149 /* 8150 * Give other IO more of a chance. 8151 * The faster the devices, the less we wait. 8152 */ 8153 wait_event(mddev->recovery_wait, 8154 !atomic_read(&mddev->recovery_active)); 8155 } 8156 } 8157 } 8158 pr_info("md: %s: %s %s.\n",mdname(mddev), desc, 8159 test_bit(MD_RECOVERY_INTR, &mddev->recovery) 8160 ? "interrupted" : "done"); 8161 /* 8162 * this also signals 'finished resyncing' to md_stop 8163 */ 8164 blk_finish_plug(&plug); 8165 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 8166 8167 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8168 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 8169 mddev->curr_resync > 3) { 8170 mddev->curr_resync_completed = mddev->curr_resync; 8171 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 8172 } 8173 mddev->pers->sync_request(mddev, max_sectors, &skipped); 8174 8175 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && 8176 mddev->curr_resync > 3) { 8177 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 8178 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 8179 if (mddev->curr_resync >= mddev->recovery_cp) { 8180 pr_debug("md: checkpointing %s of %s.\n", 8181 desc, mdname(mddev)); 8182 if (test_bit(MD_RECOVERY_ERROR, 8183 &mddev->recovery)) 8184 mddev->recovery_cp = 8185 mddev->curr_resync_completed; 8186 else 8187 mddev->recovery_cp = 8188 mddev->curr_resync; 8189 } 8190 } else 8191 mddev->recovery_cp = MaxSector; 8192 } else { 8193 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8194 mddev->curr_resync = MaxSector; 8195 rcu_read_lock(); 8196 rdev_for_each_rcu(rdev, mddev) 8197 if (rdev->raid_disk >= 0 && 8198 mddev->delta_disks >= 0 && 8199 !test_bit(Journal, &rdev->flags) && 8200 !test_bit(Faulty, &rdev->flags) && 8201 !test_bit(In_sync, &rdev->flags) && 8202 rdev->recovery_offset < mddev->curr_resync) 8203 rdev->recovery_offset = mddev->curr_resync; 8204 rcu_read_unlock(); 8205 } 8206 } 8207 skip: 8208 /* set CHANGE_PENDING here since maybe another update is needed, 8209 * so other nodes are informed. It should be harmless for normal 8210 * raid */ 8211 set_mask_bits(&mddev->sb_flags, 0, 8212 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS)); 8213 8214 spin_lock(&mddev->lock); 8215 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 8216 /* We completed so min/max setting can be forgotten if used. */ 8217 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 8218 mddev->resync_min = 0; 8219 mddev->resync_max = MaxSector; 8220 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 8221 mddev->resync_min = mddev->curr_resync_completed; 8222 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 8223 mddev->curr_resync = 0; 8224 spin_unlock(&mddev->lock); 8225 8226 wake_up(&resync_wait); 8227 md_wakeup_thread(mddev->thread); 8228 return; 8229 } 8230 EXPORT_SYMBOL_GPL(md_do_sync); 8231 8232 static int remove_and_add_spares(struct mddev *mddev, 8233 struct md_rdev *this) 8234 { 8235 struct md_rdev *rdev; 8236 int spares = 0; 8237 int removed = 0; 8238 bool remove_some = false; 8239 8240 rdev_for_each(rdev, mddev) { 8241 if ((this == NULL || rdev == this) && 8242 rdev->raid_disk >= 0 && 8243 !test_bit(Blocked, &rdev->flags) && 8244 test_bit(Faulty, &rdev->flags) && 8245 atomic_read(&rdev->nr_pending)==0) { 8246 /* Faulty non-Blocked devices with nr_pending == 0 8247 * never get nr_pending incremented, 8248 * never get Faulty cleared, and never get Blocked set. 8249 * So we can synchronize_rcu now rather than once per device 8250 */ 8251 remove_some = true; 8252 set_bit(RemoveSynchronized, &rdev->flags); 8253 } 8254 } 8255 8256 if (remove_some) 8257 synchronize_rcu(); 8258 rdev_for_each(rdev, mddev) { 8259 if ((this == NULL || rdev == this) && 8260 rdev->raid_disk >= 0 && 8261 !test_bit(Blocked, &rdev->flags) && 8262 ((test_bit(RemoveSynchronized, &rdev->flags) || 8263 (!test_bit(In_sync, &rdev->flags) && 8264 !test_bit(Journal, &rdev->flags))) && 8265 atomic_read(&rdev->nr_pending)==0)) { 8266 if (mddev->pers->hot_remove_disk( 8267 mddev, rdev) == 0) { 8268 sysfs_unlink_rdev(mddev, rdev); 8269 rdev->raid_disk = -1; 8270 removed++; 8271 } 8272 } 8273 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags)) 8274 clear_bit(RemoveSynchronized, &rdev->flags); 8275 } 8276 8277 if (removed && mddev->kobj.sd) 8278 sysfs_notify(&mddev->kobj, NULL, "degraded"); 8279 8280 if (this && removed) 8281 goto no_add; 8282 8283 rdev_for_each(rdev, mddev) { 8284 if (this && this != rdev) 8285 continue; 8286 if (test_bit(Candidate, &rdev->flags)) 8287 continue; 8288 if (rdev->raid_disk >= 0 && 8289 !test_bit(In_sync, &rdev->flags) && 8290 !test_bit(Journal, &rdev->flags) && 8291 !test_bit(Faulty, &rdev->flags)) 8292 spares++; 8293 if (rdev->raid_disk >= 0) 8294 continue; 8295 if (test_bit(Faulty, &rdev->flags)) 8296 continue; 8297 if (!test_bit(Journal, &rdev->flags)) { 8298 if (mddev->ro && 8299 ! (rdev->saved_raid_disk >= 0 && 8300 !test_bit(Bitmap_sync, &rdev->flags))) 8301 continue; 8302 8303 rdev->recovery_offset = 0; 8304 } 8305 if (mddev->pers-> 8306 hot_add_disk(mddev, rdev) == 0) { 8307 if (sysfs_link_rdev(mddev, rdev)) 8308 /* failure here is OK */; 8309 if (!test_bit(Journal, &rdev->flags)) 8310 spares++; 8311 md_new_event(mddev); 8312 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 8313 } 8314 } 8315 no_add: 8316 if (removed) 8317 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 8318 return spares; 8319 } 8320 8321 static void md_start_sync(struct work_struct *ws) 8322 { 8323 struct mddev *mddev = container_of(ws, struct mddev, del_work); 8324 8325 mddev->sync_thread = md_register_thread(md_do_sync, 8326 mddev, 8327 "resync"); 8328 if (!mddev->sync_thread) { 8329 pr_warn("%s: could not start resync thread...\n", 8330 mdname(mddev)); 8331 /* leave the spares where they are, it shouldn't hurt */ 8332 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 8333 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 8334 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 8335 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 8336 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 8337 wake_up(&resync_wait); 8338 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 8339 &mddev->recovery)) 8340 if (mddev->sysfs_action) 8341 sysfs_notify_dirent_safe(mddev->sysfs_action); 8342 } else 8343 md_wakeup_thread(mddev->sync_thread); 8344 sysfs_notify_dirent_safe(mddev->sysfs_action); 8345 md_new_event(mddev); 8346 } 8347 8348 /* 8349 * This routine is regularly called by all per-raid-array threads to 8350 * deal with generic issues like resync and super-block update. 8351 * Raid personalities that don't have a thread (linear/raid0) do not 8352 * need this as they never do any recovery or update the superblock. 8353 * 8354 * It does not do any resync itself, but rather "forks" off other threads 8355 * to do that as needed. 8356 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 8357 * "->recovery" and create a thread at ->sync_thread. 8358 * When the thread finishes it sets MD_RECOVERY_DONE 8359 * and wakeups up this thread which will reap the thread and finish up. 8360 * This thread also removes any faulty devices (with nr_pending == 0). 8361 * 8362 * The overall approach is: 8363 * 1/ if the superblock needs updating, update it. 8364 * 2/ If a recovery thread is running, don't do anything else. 8365 * 3/ If recovery has finished, clean up, possibly marking spares active. 8366 * 4/ If there are any faulty devices, remove them. 8367 * 5/ If array is degraded, try to add spares devices 8368 * 6/ If array has spares or is not in-sync, start a resync thread. 8369 */ 8370 void md_check_recovery(struct mddev *mddev) 8371 { 8372 if (mddev->suspended) 8373 return; 8374 8375 if (mddev->bitmap) 8376 bitmap_daemon_work(mddev); 8377 8378 if (signal_pending(current)) { 8379 if (mddev->pers->sync_request && !mddev->external) { 8380 pr_debug("md: %s in immediate safe mode\n", 8381 mdname(mddev)); 8382 mddev->safemode = 2; 8383 } 8384 flush_signals(current); 8385 } 8386 8387 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 8388 return; 8389 if ( ! ( 8390 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) || 8391 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 8392 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 8393 test_bit(MD_RELOAD_SB, &mddev->flags) || 8394 (mddev->external == 0 && mddev->safemode == 1) || 8395 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 8396 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 8397 )) 8398 return; 8399 8400 if (mddev_trylock(mddev)) { 8401 int spares = 0; 8402 8403 if (mddev->ro) { 8404 struct md_rdev *rdev; 8405 if (!mddev->external && mddev->in_sync) 8406 /* 'Blocked' flag not needed as failed devices 8407 * will be recorded if array switched to read/write. 8408 * Leaving it set will prevent the device 8409 * from being removed. 8410 */ 8411 rdev_for_each(rdev, mddev) 8412 clear_bit(Blocked, &rdev->flags); 8413 /* On a read-only array we can: 8414 * - remove failed devices 8415 * - add already-in_sync devices if the array itself 8416 * is in-sync. 8417 * As we only add devices that are already in-sync, 8418 * we can activate the spares immediately. 8419 */ 8420 remove_and_add_spares(mddev, NULL); 8421 /* There is no thread, but we need to call 8422 * ->spare_active and clear saved_raid_disk 8423 */ 8424 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 8425 md_reap_sync_thread(mddev); 8426 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 8427 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 8428 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 8429 goto unlock; 8430 } 8431 8432 if (mddev_is_clustered(mddev)) { 8433 struct md_rdev *rdev; 8434 /* kick the device if another node issued a 8435 * remove disk. 8436 */ 8437 rdev_for_each(rdev, mddev) { 8438 if (test_and_clear_bit(ClusterRemove, &rdev->flags) && 8439 rdev->raid_disk < 0) 8440 md_kick_rdev_from_array(rdev); 8441 } 8442 8443 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags)) 8444 md_reload_sb(mddev, mddev->good_device_nr); 8445 } 8446 8447 if (!mddev->external) { 8448 int did_change = 0; 8449 spin_lock(&mddev->lock); 8450 if (mddev->safemode && 8451 !atomic_read(&mddev->writes_pending) && 8452 !mddev->in_sync && 8453 mddev->recovery_cp == MaxSector) { 8454 mddev->in_sync = 1; 8455 did_change = 1; 8456 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 8457 } 8458 if (mddev->safemode == 1) 8459 mddev->safemode = 0; 8460 spin_unlock(&mddev->lock); 8461 if (did_change) 8462 sysfs_notify_dirent_safe(mddev->sysfs_state); 8463 } 8464 8465 if (mddev->sb_flags) 8466 md_update_sb(mddev, 0); 8467 8468 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 8469 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 8470 /* resync/recovery still happening */ 8471 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 8472 goto unlock; 8473 } 8474 if (mddev->sync_thread) { 8475 md_reap_sync_thread(mddev); 8476 goto unlock; 8477 } 8478 /* Set RUNNING before clearing NEEDED to avoid 8479 * any transients in the value of "sync_action". 8480 */ 8481 mddev->curr_resync_completed = 0; 8482 spin_lock(&mddev->lock); 8483 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 8484 spin_unlock(&mddev->lock); 8485 /* Clear some bits that don't mean anything, but 8486 * might be left set 8487 */ 8488 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 8489 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 8490 8491 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 8492 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 8493 goto not_running; 8494 /* no recovery is running. 8495 * remove any failed drives, then 8496 * add spares if possible. 8497 * Spares are also removed and re-added, to allow 8498 * the personality to fail the re-add. 8499 */ 8500 8501 if (mddev->reshape_position != MaxSector) { 8502 if (mddev->pers->check_reshape == NULL || 8503 mddev->pers->check_reshape(mddev) != 0) 8504 /* Cannot proceed */ 8505 goto not_running; 8506 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 8507 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 8508 } else if ((spares = remove_and_add_spares(mddev, NULL))) { 8509 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 8510 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 8511 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 8512 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 8513 } else if (mddev->recovery_cp < MaxSector) { 8514 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 8515 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 8516 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 8517 /* nothing to be done ... */ 8518 goto not_running; 8519 8520 if (mddev->pers->sync_request) { 8521 if (spares) { 8522 /* We are adding a device or devices to an array 8523 * which has the bitmap stored on all devices. 8524 * So make sure all bitmap pages get written 8525 */ 8526 bitmap_write_all(mddev->bitmap); 8527 } 8528 INIT_WORK(&mddev->del_work, md_start_sync); 8529 queue_work(md_misc_wq, &mddev->del_work); 8530 goto unlock; 8531 } 8532 not_running: 8533 if (!mddev->sync_thread) { 8534 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 8535 wake_up(&resync_wait); 8536 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 8537 &mddev->recovery)) 8538 if (mddev->sysfs_action) 8539 sysfs_notify_dirent_safe(mddev->sysfs_action); 8540 } 8541 unlock: 8542 wake_up(&mddev->sb_wait); 8543 mddev_unlock(mddev); 8544 } 8545 } 8546 EXPORT_SYMBOL(md_check_recovery); 8547 8548 void md_reap_sync_thread(struct mddev *mddev) 8549 { 8550 struct md_rdev *rdev; 8551 8552 /* resync has finished, collect result */ 8553 md_unregister_thread(&mddev->sync_thread); 8554 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 8555 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 8556 /* success...*/ 8557 /* activate any spares */ 8558 if (mddev->pers->spare_active(mddev)) { 8559 sysfs_notify(&mddev->kobj, NULL, 8560 "degraded"); 8561 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 8562 } 8563 } 8564 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8565 mddev->pers->finish_reshape) 8566 mddev->pers->finish_reshape(mddev); 8567 8568 /* If array is no-longer degraded, then any saved_raid_disk 8569 * information must be scrapped. 8570 */ 8571 if (!mddev->degraded) 8572 rdev_for_each(rdev, mddev) 8573 rdev->saved_raid_disk = -1; 8574 8575 md_update_sb(mddev, 1); 8576 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can 8577 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by 8578 * clustered raid */ 8579 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags)) 8580 md_cluster_ops->resync_finish(mddev); 8581 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 8582 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 8583 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 8584 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 8585 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 8586 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 8587 wake_up(&resync_wait); 8588 /* flag recovery needed just to double check */ 8589 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 8590 sysfs_notify_dirent_safe(mddev->sysfs_action); 8591 md_new_event(mddev); 8592 if (mddev->event_work.func) 8593 queue_work(md_misc_wq, &mddev->event_work); 8594 } 8595 EXPORT_SYMBOL(md_reap_sync_thread); 8596 8597 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) 8598 { 8599 sysfs_notify_dirent_safe(rdev->sysfs_state); 8600 wait_event_timeout(rdev->blocked_wait, 8601 !test_bit(Blocked, &rdev->flags) && 8602 !test_bit(BlockedBadBlocks, &rdev->flags), 8603 msecs_to_jiffies(5000)); 8604 rdev_dec_pending(rdev, mddev); 8605 } 8606 EXPORT_SYMBOL(md_wait_for_blocked_rdev); 8607 8608 void md_finish_reshape(struct mddev *mddev) 8609 { 8610 /* called be personality module when reshape completes. */ 8611 struct md_rdev *rdev; 8612 8613 rdev_for_each(rdev, mddev) { 8614 if (rdev->data_offset > rdev->new_data_offset) 8615 rdev->sectors += rdev->data_offset - rdev->new_data_offset; 8616 else 8617 rdev->sectors -= rdev->new_data_offset - rdev->data_offset; 8618 rdev->data_offset = rdev->new_data_offset; 8619 } 8620 } 8621 EXPORT_SYMBOL(md_finish_reshape); 8622 8623 /* Bad block management */ 8624 8625 /* Returns 1 on success, 0 on failure */ 8626 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 8627 int is_new) 8628 { 8629 struct mddev *mddev = rdev->mddev; 8630 int rv; 8631 if (is_new) 8632 s += rdev->new_data_offset; 8633 else 8634 s += rdev->data_offset; 8635 rv = badblocks_set(&rdev->badblocks, s, sectors, 0); 8636 if (rv == 0) { 8637 /* Make sure they get written out promptly */ 8638 if (test_bit(ExternalBbl, &rdev->flags)) 8639 sysfs_notify(&rdev->kobj, NULL, 8640 "unacknowledged_bad_blocks"); 8641 sysfs_notify_dirent_safe(rdev->sysfs_state); 8642 set_mask_bits(&mddev->sb_flags, 0, 8643 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING)); 8644 md_wakeup_thread(rdev->mddev->thread); 8645 return 1; 8646 } else 8647 return 0; 8648 } 8649 EXPORT_SYMBOL_GPL(rdev_set_badblocks); 8650 8651 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 8652 int is_new) 8653 { 8654 int rv; 8655 if (is_new) 8656 s += rdev->new_data_offset; 8657 else 8658 s += rdev->data_offset; 8659 rv = badblocks_clear(&rdev->badblocks, s, sectors); 8660 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags)) 8661 sysfs_notify(&rdev->kobj, NULL, "bad_blocks"); 8662 return rv; 8663 } 8664 EXPORT_SYMBOL_GPL(rdev_clear_badblocks); 8665 8666 static int md_notify_reboot(struct notifier_block *this, 8667 unsigned long code, void *x) 8668 { 8669 struct list_head *tmp; 8670 struct mddev *mddev; 8671 int need_delay = 0; 8672 8673 for_each_mddev(mddev, tmp) { 8674 if (mddev_trylock(mddev)) { 8675 if (mddev->pers) 8676 __md_stop_writes(mddev); 8677 if (mddev->persistent) 8678 mddev->safemode = 2; 8679 mddev_unlock(mddev); 8680 } 8681 need_delay = 1; 8682 } 8683 /* 8684 * certain more exotic SCSI devices are known to be 8685 * volatile wrt too early system reboots. While the 8686 * right place to handle this issue is the given 8687 * driver, we do want to have a safe RAID driver ... 8688 */ 8689 if (need_delay) 8690 mdelay(1000*1); 8691 8692 return NOTIFY_DONE; 8693 } 8694 8695 static struct notifier_block md_notifier = { 8696 .notifier_call = md_notify_reboot, 8697 .next = NULL, 8698 .priority = INT_MAX, /* before any real devices */ 8699 }; 8700 8701 static void md_geninit(void) 8702 { 8703 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 8704 8705 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); 8706 } 8707 8708 static int __init md_init(void) 8709 { 8710 int ret = -ENOMEM; 8711 8712 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); 8713 if (!md_wq) 8714 goto err_wq; 8715 8716 md_misc_wq = alloc_workqueue("md_misc", 0, 0); 8717 if (!md_misc_wq) 8718 goto err_misc_wq; 8719 8720 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) 8721 goto err_md; 8722 8723 if ((ret = register_blkdev(0, "mdp")) < 0) 8724 goto err_mdp; 8725 mdp_major = ret; 8726 8727 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, 8728 md_probe, NULL, NULL); 8729 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, 8730 md_probe, NULL, NULL); 8731 8732 register_reboot_notifier(&md_notifier); 8733 raid_table_header = register_sysctl_table(raid_root_table); 8734 8735 md_geninit(); 8736 return 0; 8737 8738 err_mdp: 8739 unregister_blkdev(MD_MAJOR, "md"); 8740 err_md: 8741 destroy_workqueue(md_misc_wq); 8742 err_misc_wq: 8743 destroy_workqueue(md_wq); 8744 err_wq: 8745 return ret; 8746 } 8747 8748 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) 8749 { 8750 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 8751 struct md_rdev *rdev2; 8752 int role, ret; 8753 char b[BDEVNAME_SIZE]; 8754 8755 /* Check for change of roles in the active devices */ 8756 rdev_for_each(rdev2, mddev) { 8757 if (test_bit(Faulty, &rdev2->flags)) 8758 continue; 8759 8760 /* Check if the roles changed */ 8761 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); 8762 8763 if (test_bit(Candidate, &rdev2->flags)) { 8764 if (role == 0xfffe) { 8765 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); 8766 md_kick_rdev_from_array(rdev2); 8767 continue; 8768 } 8769 else 8770 clear_bit(Candidate, &rdev2->flags); 8771 } 8772 8773 if (role != rdev2->raid_disk) { 8774 /* got activated */ 8775 if (rdev2->raid_disk == -1 && role != 0xffff) { 8776 rdev2->saved_raid_disk = role; 8777 ret = remove_and_add_spares(mddev, rdev2); 8778 pr_info("Activated spare: %s\n", 8779 bdevname(rdev2->bdev,b)); 8780 /* wakeup mddev->thread here, so array could 8781 * perform resync with the new activated disk */ 8782 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 8783 md_wakeup_thread(mddev->thread); 8784 8785 } 8786 /* device faulty 8787 * We just want to do the minimum to mark the disk 8788 * as faulty. The recovery is performed by the 8789 * one who initiated the error. 8790 */ 8791 if ((role == 0xfffe) || (role == 0xfffd)) { 8792 md_error(mddev, rdev2); 8793 clear_bit(Blocked, &rdev2->flags); 8794 } 8795 } 8796 } 8797 8798 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) 8799 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); 8800 8801 /* Finally set the event to be up to date */ 8802 mddev->events = le64_to_cpu(sb->events); 8803 } 8804 8805 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) 8806 { 8807 int err; 8808 struct page *swapout = rdev->sb_page; 8809 struct mdp_superblock_1 *sb; 8810 8811 /* Store the sb page of the rdev in the swapout temporary 8812 * variable in case we err in the future 8813 */ 8814 rdev->sb_page = NULL; 8815 err = alloc_disk_sb(rdev); 8816 if (err == 0) { 8817 ClearPageUptodate(rdev->sb_page); 8818 rdev->sb_loaded = 0; 8819 err = super_types[mddev->major_version]. 8820 load_super(rdev, NULL, mddev->minor_version); 8821 } 8822 if (err < 0) { 8823 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", 8824 __func__, __LINE__, rdev->desc_nr, err); 8825 if (rdev->sb_page) 8826 put_page(rdev->sb_page); 8827 rdev->sb_page = swapout; 8828 rdev->sb_loaded = 1; 8829 return err; 8830 } 8831 8832 sb = page_address(rdev->sb_page); 8833 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET 8834 * is not set 8835 */ 8836 8837 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) 8838 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 8839 8840 /* The other node finished recovery, call spare_active to set 8841 * device In_sync and mddev->degraded 8842 */ 8843 if (rdev->recovery_offset == MaxSector && 8844 !test_bit(In_sync, &rdev->flags) && 8845 mddev->pers->spare_active(mddev)) 8846 sysfs_notify(&mddev->kobj, NULL, "degraded"); 8847 8848 put_page(swapout); 8849 return 0; 8850 } 8851 8852 void md_reload_sb(struct mddev *mddev, int nr) 8853 { 8854 struct md_rdev *rdev; 8855 int err; 8856 8857 /* Find the rdev */ 8858 rdev_for_each_rcu(rdev, mddev) { 8859 if (rdev->desc_nr == nr) 8860 break; 8861 } 8862 8863 if (!rdev || rdev->desc_nr != nr) { 8864 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); 8865 return; 8866 } 8867 8868 err = read_rdev(mddev, rdev); 8869 if (err < 0) 8870 return; 8871 8872 check_sb_changes(mddev, rdev); 8873 8874 /* Read all rdev's to update recovery_offset */ 8875 rdev_for_each_rcu(rdev, mddev) 8876 read_rdev(mddev, rdev); 8877 } 8878 EXPORT_SYMBOL(md_reload_sb); 8879 8880 #ifndef MODULE 8881 8882 /* 8883 * Searches all registered partitions for autorun RAID arrays 8884 * at boot time. 8885 */ 8886 8887 static DEFINE_MUTEX(detected_devices_mutex); 8888 static LIST_HEAD(all_detected_devices); 8889 struct detected_devices_node { 8890 struct list_head list; 8891 dev_t dev; 8892 }; 8893 8894 void md_autodetect_dev(dev_t dev) 8895 { 8896 struct detected_devices_node *node_detected_dev; 8897 8898 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); 8899 if (node_detected_dev) { 8900 node_detected_dev->dev = dev; 8901 mutex_lock(&detected_devices_mutex); 8902 list_add_tail(&node_detected_dev->list, &all_detected_devices); 8903 mutex_unlock(&detected_devices_mutex); 8904 } 8905 } 8906 8907 static void autostart_arrays(int part) 8908 { 8909 struct md_rdev *rdev; 8910 struct detected_devices_node *node_detected_dev; 8911 dev_t dev; 8912 int i_scanned, i_passed; 8913 8914 i_scanned = 0; 8915 i_passed = 0; 8916 8917 pr_info("md: Autodetecting RAID arrays.\n"); 8918 8919 mutex_lock(&detected_devices_mutex); 8920 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { 8921 i_scanned++; 8922 node_detected_dev = list_entry(all_detected_devices.next, 8923 struct detected_devices_node, list); 8924 list_del(&node_detected_dev->list); 8925 dev = node_detected_dev->dev; 8926 kfree(node_detected_dev); 8927 mutex_unlock(&detected_devices_mutex); 8928 rdev = md_import_device(dev,0, 90); 8929 mutex_lock(&detected_devices_mutex); 8930 if (IS_ERR(rdev)) 8931 continue; 8932 8933 if (test_bit(Faulty, &rdev->flags)) 8934 continue; 8935 8936 set_bit(AutoDetected, &rdev->flags); 8937 list_add(&rdev->same_set, &pending_raid_disks); 8938 i_passed++; 8939 } 8940 mutex_unlock(&detected_devices_mutex); 8941 8942 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed); 8943 8944 autorun_devices(part); 8945 } 8946 8947 #endif /* !MODULE */ 8948 8949 static __exit void md_exit(void) 8950 { 8951 struct mddev *mddev; 8952 struct list_head *tmp; 8953 int delay = 1; 8954 8955 blk_unregister_region(MKDEV(MD_MAJOR,0), 512); 8956 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); 8957 8958 unregister_blkdev(MD_MAJOR,"md"); 8959 unregister_blkdev(mdp_major, "mdp"); 8960 unregister_reboot_notifier(&md_notifier); 8961 unregister_sysctl_table(raid_table_header); 8962 8963 /* We cannot unload the modules while some process is 8964 * waiting for us in select() or poll() - wake them up 8965 */ 8966 md_unloading = 1; 8967 while (waitqueue_active(&md_event_waiters)) { 8968 /* not safe to leave yet */ 8969 wake_up(&md_event_waiters); 8970 msleep(delay); 8971 delay += delay; 8972 } 8973 remove_proc_entry("mdstat", NULL); 8974 8975 for_each_mddev(mddev, tmp) { 8976 export_array(mddev); 8977 mddev->ctime = 0; 8978 mddev->hold_active = 0; 8979 /* 8980 * for_each_mddev() will call mddev_put() at the end of each 8981 * iteration. As the mddev is now fully clear, this will 8982 * schedule the mddev for destruction by a workqueue, and the 8983 * destroy_workqueue() below will wait for that to complete. 8984 */ 8985 } 8986 destroy_workqueue(md_misc_wq); 8987 destroy_workqueue(md_wq); 8988 } 8989 8990 subsys_initcall(md_init); 8991 module_exit(md_exit) 8992 8993 static int get_ro(char *buffer, struct kernel_param *kp) 8994 { 8995 return sprintf(buffer, "%d", start_readonly); 8996 } 8997 static int set_ro(const char *val, struct kernel_param *kp) 8998 { 8999 return kstrtouint(val, 10, (unsigned int *)&start_readonly); 9000 } 9001 9002 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); 9003 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); 9004 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); 9005 9006 MODULE_LICENSE("GPL"); 9007 MODULE_DESCRIPTION("MD RAID framework"); 9008 MODULE_ALIAS("md"); 9009 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 9010