1 /* 2 md.c : Multiple Devices driver for Linux 3 Copyright (C) 1998, 1999, 2000 Ingo Molnar 4 5 completely rewritten, based on the MD driver code from Marc Zyngier 6 7 Changes: 8 9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar 10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> 11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> 12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su> 13 - kmod support by: Cyrus Durgin 14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> 15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> 16 17 - lots of fixes and improvements to the RAID1/RAID5 and generic 18 RAID code (such as request based resynchronization): 19 20 Neil Brown <neilb@cse.unsw.edu.au>. 21 22 - persistent bitmap code 23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. 24 25 This program is free software; you can redistribute it and/or modify 26 it under the terms of the GNU General Public License as published by 27 the Free Software Foundation; either version 2, or (at your option) 28 any later version. 29 30 You should have received a copy of the GNU General Public License 31 (for example /usr/src/linux/COPYING); if not, write to the Free 32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 33 */ 34 35 #include <linux/kthread.h> 36 #include <linux/blkdev.h> 37 #include <linux/badblocks.h> 38 #include <linux/sysctl.h> 39 #include <linux/seq_file.h> 40 #include <linux/fs.h> 41 #include <linux/poll.h> 42 #include <linux/ctype.h> 43 #include <linux/string.h> 44 #include <linux/hdreg.h> 45 #include <linux/proc_fs.h> 46 #include <linux/random.h> 47 #include <linux/module.h> 48 #include <linux/reboot.h> 49 #include <linux/file.h> 50 #include <linux/compat.h> 51 #include <linux/delay.h> 52 #include <linux/raid/md_p.h> 53 #include <linux/raid/md_u.h> 54 #include <linux/slab.h> 55 #include "md.h" 56 #include "bitmap.h" 57 #include "md-cluster.h" 58 59 #ifndef MODULE 60 static void autostart_arrays(int part); 61 #endif 62 63 /* pers_list is a list of registered personalities protected 64 * by pers_lock. 65 * pers_lock does extra service to protect accesses to 66 * mddev->thread when the mutex cannot be held. 67 */ 68 static LIST_HEAD(pers_list); 69 static DEFINE_SPINLOCK(pers_lock); 70 71 struct md_cluster_operations *md_cluster_ops; 72 EXPORT_SYMBOL(md_cluster_ops); 73 struct module *md_cluster_mod; 74 EXPORT_SYMBOL(md_cluster_mod); 75 76 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 77 static struct workqueue_struct *md_wq; 78 static struct workqueue_struct *md_misc_wq; 79 80 static int remove_and_add_spares(struct mddev *mddev, 81 struct md_rdev *this); 82 static void mddev_detach(struct mddev *mddev); 83 84 /* 85 * Default number of read corrections we'll attempt on an rdev 86 * before ejecting it from the array. We divide the read error 87 * count by 2 for every hour elapsed between read errors. 88 */ 89 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 90 /* 91 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 92 * is 1000 KB/sec, so the extra system load does not show up that much. 93 * Increase it if you want to have more _guaranteed_ speed. Note that 94 * the RAID driver will use the maximum available bandwidth if the IO 95 * subsystem is idle. There is also an 'absolute maximum' reconstruction 96 * speed limit - in case reconstruction slows down your system despite 97 * idle IO detection. 98 * 99 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 100 * or /sys/block/mdX/md/sync_speed_{min,max} 101 */ 102 103 static int sysctl_speed_limit_min = 1000; 104 static int sysctl_speed_limit_max = 200000; 105 static inline int speed_min(struct mddev *mddev) 106 { 107 return mddev->sync_speed_min ? 108 mddev->sync_speed_min : sysctl_speed_limit_min; 109 } 110 111 static inline int speed_max(struct mddev *mddev) 112 { 113 return mddev->sync_speed_max ? 114 mddev->sync_speed_max : sysctl_speed_limit_max; 115 } 116 117 static struct ctl_table_header *raid_table_header; 118 119 static struct ctl_table raid_table[] = { 120 { 121 .procname = "speed_limit_min", 122 .data = &sysctl_speed_limit_min, 123 .maxlen = sizeof(int), 124 .mode = S_IRUGO|S_IWUSR, 125 .proc_handler = proc_dointvec, 126 }, 127 { 128 .procname = "speed_limit_max", 129 .data = &sysctl_speed_limit_max, 130 .maxlen = sizeof(int), 131 .mode = S_IRUGO|S_IWUSR, 132 .proc_handler = proc_dointvec, 133 }, 134 { } 135 }; 136 137 static struct ctl_table raid_dir_table[] = { 138 { 139 .procname = "raid", 140 .maxlen = 0, 141 .mode = S_IRUGO|S_IXUGO, 142 .child = raid_table, 143 }, 144 { } 145 }; 146 147 static struct ctl_table raid_root_table[] = { 148 { 149 .procname = "dev", 150 .maxlen = 0, 151 .mode = 0555, 152 .child = raid_dir_table, 153 }, 154 { } 155 }; 156 157 static const struct block_device_operations md_fops; 158 159 static int start_readonly; 160 161 /* bio_clone_mddev 162 * like bio_clone, but with a local bio set 163 */ 164 165 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, 166 struct mddev *mddev) 167 { 168 struct bio *b; 169 170 if (!mddev || !mddev->bio_set) 171 return bio_alloc(gfp_mask, nr_iovecs); 172 173 b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); 174 if (!b) 175 return NULL; 176 return b; 177 } 178 EXPORT_SYMBOL_GPL(bio_alloc_mddev); 179 180 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, 181 struct mddev *mddev) 182 { 183 if (!mddev || !mddev->bio_set) 184 return bio_clone(bio, gfp_mask); 185 186 return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); 187 } 188 EXPORT_SYMBOL_GPL(bio_clone_mddev); 189 190 /* 191 * We have a system wide 'event count' that is incremented 192 * on any 'interesting' event, and readers of /proc/mdstat 193 * can use 'poll' or 'select' to find out when the event 194 * count increases. 195 * 196 * Events are: 197 * start array, stop array, error, add device, remove device, 198 * start build, activate spare 199 */ 200 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); 201 static atomic_t md_event_count; 202 void md_new_event(struct mddev *mddev) 203 { 204 atomic_inc(&md_event_count); 205 wake_up(&md_event_waiters); 206 } 207 EXPORT_SYMBOL_GPL(md_new_event); 208 209 /* 210 * Enables to iterate over all existing md arrays 211 * all_mddevs_lock protects this list. 212 */ 213 static LIST_HEAD(all_mddevs); 214 static DEFINE_SPINLOCK(all_mddevs_lock); 215 216 /* 217 * iterates through all used mddevs in the system. 218 * We take care to grab the all_mddevs_lock whenever navigating 219 * the list, and to always hold a refcount when unlocked. 220 * Any code which breaks out of this loop while own 221 * a reference to the current mddev and must mddev_put it. 222 */ 223 #define for_each_mddev(_mddev,_tmp) \ 224 \ 225 for (({ spin_lock(&all_mddevs_lock); \ 226 _tmp = all_mddevs.next; \ 227 _mddev = NULL;}); \ 228 ({ if (_tmp != &all_mddevs) \ 229 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ 230 spin_unlock(&all_mddevs_lock); \ 231 if (_mddev) mddev_put(_mddev); \ 232 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ 233 _tmp != &all_mddevs;}); \ 234 ({ spin_lock(&all_mddevs_lock); \ 235 _tmp = _tmp->next;}) \ 236 ) 237 238 /* Rather than calling directly into the personality make_request function, 239 * IO requests come here first so that we can check if the device is 240 * being suspended pending a reconfiguration. 241 * We hold a refcount over the call to ->make_request. By the time that 242 * call has finished, the bio has been linked into some internal structure 243 * and so is visible to ->quiesce(), so we don't need the refcount any more. 244 */ 245 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) 246 { 247 const int rw = bio_data_dir(bio); 248 struct mddev *mddev = q->queuedata; 249 unsigned int sectors; 250 int cpu; 251 252 blk_queue_split(q, &bio, q->bio_split); 253 254 if (mddev == NULL || mddev->pers == NULL) { 255 bio_io_error(bio); 256 return BLK_QC_T_NONE; 257 } 258 if (mddev->ro == 1 && unlikely(rw == WRITE)) { 259 if (bio_sectors(bio) != 0) 260 bio->bi_error = -EROFS; 261 bio_endio(bio); 262 return BLK_QC_T_NONE; 263 } 264 smp_rmb(); /* Ensure implications of 'active' are visible */ 265 rcu_read_lock(); 266 if (mddev->suspended) { 267 DEFINE_WAIT(__wait); 268 for (;;) { 269 prepare_to_wait(&mddev->sb_wait, &__wait, 270 TASK_UNINTERRUPTIBLE); 271 if (!mddev->suspended) 272 break; 273 rcu_read_unlock(); 274 schedule(); 275 rcu_read_lock(); 276 } 277 finish_wait(&mddev->sb_wait, &__wait); 278 } 279 atomic_inc(&mddev->active_io); 280 rcu_read_unlock(); 281 282 /* 283 * save the sectors now since our bio can 284 * go away inside make_request 285 */ 286 sectors = bio_sectors(bio); 287 mddev->pers->make_request(mddev, bio); 288 289 cpu = part_stat_lock(); 290 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); 291 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); 292 part_stat_unlock(); 293 294 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) 295 wake_up(&mddev->sb_wait); 296 297 return BLK_QC_T_NONE; 298 } 299 300 /* mddev_suspend makes sure no new requests are submitted 301 * to the device, and that any requests that have been submitted 302 * are completely handled. 303 * Once mddev_detach() is called and completes, the module will be 304 * completely unused. 305 */ 306 void mddev_suspend(struct mddev *mddev) 307 { 308 WARN_ON_ONCE(current == mddev->thread->tsk); 309 if (mddev->suspended++) 310 return; 311 synchronize_rcu(); 312 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); 313 mddev->pers->quiesce(mddev, 1); 314 315 del_timer_sync(&mddev->safemode_timer); 316 } 317 EXPORT_SYMBOL_GPL(mddev_suspend); 318 319 void mddev_resume(struct mddev *mddev) 320 { 321 if (--mddev->suspended) 322 return; 323 wake_up(&mddev->sb_wait); 324 mddev->pers->quiesce(mddev, 0); 325 326 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 327 md_wakeup_thread(mddev->thread); 328 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 329 } 330 EXPORT_SYMBOL_GPL(mddev_resume); 331 332 int mddev_congested(struct mddev *mddev, int bits) 333 { 334 struct md_personality *pers = mddev->pers; 335 int ret = 0; 336 337 rcu_read_lock(); 338 if (mddev->suspended) 339 ret = 1; 340 else if (pers && pers->congested) 341 ret = pers->congested(mddev, bits); 342 rcu_read_unlock(); 343 return ret; 344 } 345 EXPORT_SYMBOL_GPL(mddev_congested); 346 static int md_congested(void *data, int bits) 347 { 348 struct mddev *mddev = data; 349 return mddev_congested(mddev, bits); 350 } 351 352 /* 353 * Generic flush handling for md 354 */ 355 356 static void md_end_flush(struct bio *bio) 357 { 358 struct md_rdev *rdev = bio->bi_private; 359 struct mddev *mddev = rdev->mddev; 360 361 rdev_dec_pending(rdev, mddev); 362 363 if (atomic_dec_and_test(&mddev->flush_pending)) { 364 /* The pre-request flush has finished */ 365 queue_work(md_wq, &mddev->flush_work); 366 } 367 bio_put(bio); 368 } 369 370 static void md_submit_flush_data(struct work_struct *ws); 371 372 static void submit_flushes(struct work_struct *ws) 373 { 374 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 375 struct md_rdev *rdev; 376 377 INIT_WORK(&mddev->flush_work, md_submit_flush_data); 378 atomic_set(&mddev->flush_pending, 1); 379 rcu_read_lock(); 380 rdev_for_each_rcu(rdev, mddev) 381 if (rdev->raid_disk >= 0 && 382 !test_bit(Faulty, &rdev->flags)) { 383 /* Take two references, one is dropped 384 * when request finishes, one after 385 * we reclaim rcu_read_lock 386 */ 387 struct bio *bi; 388 atomic_inc(&rdev->nr_pending); 389 atomic_inc(&rdev->nr_pending); 390 rcu_read_unlock(); 391 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); 392 bi->bi_end_io = md_end_flush; 393 bi->bi_private = rdev; 394 bi->bi_bdev = rdev->bdev; 395 atomic_inc(&mddev->flush_pending); 396 submit_bio(WRITE_FLUSH, bi); 397 rcu_read_lock(); 398 rdev_dec_pending(rdev, mddev); 399 } 400 rcu_read_unlock(); 401 if (atomic_dec_and_test(&mddev->flush_pending)) 402 queue_work(md_wq, &mddev->flush_work); 403 } 404 405 static void md_submit_flush_data(struct work_struct *ws) 406 { 407 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 408 struct bio *bio = mddev->flush_bio; 409 410 if (bio->bi_iter.bi_size == 0) 411 /* an empty barrier - all done */ 412 bio_endio(bio); 413 else { 414 bio->bi_rw &= ~REQ_FLUSH; 415 mddev->pers->make_request(mddev, bio); 416 } 417 418 mddev->flush_bio = NULL; 419 wake_up(&mddev->sb_wait); 420 } 421 422 void md_flush_request(struct mddev *mddev, struct bio *bio) 423 { 424 spin_lock_irq(&mddev->lock); 425 wait_event_lock_irq(mddev->sb_wait, 426 !mddev->flush_bio, 427 mddev->lock); 428 mddev->flush_bio = bio; 429 spin_unlock_irq(&mddev->lock); 430 431 INIT_WORK(&mddev->flush_work, submit_flushes); 432 queue_work(md_wq, &mddev->flush_work); 433 } 434 EXPORT_SYMBOL(md_flush_request); 435 436 void md_unplug(struct blk_plug_cb *cb, bool from_schedule) 437 { 438 struct mddev *mddev = cb->data; 439 md_wakeup_thread(mddev->thread); 440 kfree(cb); 441 } 442 EXPORT_SYMBOL(md_unplug); 443 444 static inline struct mddev *mddev_get(struct mddev *mddev) 445 { 446 atomic_inc(&mddev->active); 447 return mddev; 448 } 449 450 static void mddev_delayed_delete(struct work_struct *ws); 451 452 static void mddev_put(struct mddev *mddev) 453 { 454 struct bio_set *bs = NULL; 455 456 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 457 return; 458 if (!mddev->raid_disks && list_empty(&mddev->disks) && 459 mddev->ctime == 0 && !mddev->hold_active) { 460 /* Array is not configured at all, and not held active, 461 * so destroy it */ 462 list_del_init(&mddev->all_mddevs); 463 bs = mddev->bio_set; 464 mddev->bio_set = NULL; 465 if (mddev->gendisk) { 466 /* We did a probe so need to clean up. Call 467 * queue_work inside the spinlock so that 468 * flush_workqueue() after mddev_find will 469 * succeed in waiting for the work to be done. 470 */ 471 INIT_WORK(&mddev->del_work, mddev_delayed_delete); 472 queue_work(md_misc_wq, &mddev->del_work); 473 } else 474 kfree(mddev); 475 } 476 spin_unlock(&all_mddevs_lock); 477 if (bs) 478 bioset_free(bs); 479 } 480 481 static void md_safemode_timeout(unsigned long data); 482 483 void mddev_init(struct mddev *mddev) 484 { 485 mutex_init(&mddev->open_mutex); 486 mutex_init(&mddev->reconfig_mutex); 487 mutex_init(&mddev->bitmap_info.mutex); 488 INIT_LIST_HEAD(&mddev->disks); 489 INIT_LIST_HEAD(&mddev->all_mddevs); 490 setup_timer(&mddev->safemode_timer, md_safemode_timeout, 491 (unsigned long) mddev); 492 atomic_set(&mddev->active, 1); 493 atomic_set(&mddev->openers, 0); 494 atomic_set(&mddev->active_io, 0); 495 spin_lock_init(&mddev->lock); 496 atomic_set(&mddev->flush_pending, 0); 497 init_waitqueue_head(&mddev->sb_wait); 498 init_waitqueue_head(&mddev->recovery_wait); 499 mddev->reshape_position = MaxSector; 500 mddev->reshape_backwards = 0; 501 mddev->last_sync_action = "none"; 502 mddev->resync_min = 0; 503 mddev->resync_max = MaxSector; 504 mddev->level = LEVEL_NONE; 505 } 506 EXPORT_SYMBOL_GPL(mddev_init); 507 508 static struct mddev *mddev_find(dev_t unit) 509 { 510 struct mddev *mddev, *new = NULL; 511 512 if (unit && MAJOR(unit) != MD_MAJOR) 513 unit &= ~((1<<MdpMinorShift)-1); 514 515 retry: 516 spin_lock(&all_mddevs_lock); 517 518 if (unit) { 519 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 520 if (mddev->unit == unit) { 521 mddev_get(mddev); 522 spin_unlock(&all_mddevs_lock); 523 kfree(new); 524 return mddev; 525 } 526 527 if (new) { 528 list_add(&new->all_mddevs, &all_mddevs); 529 spin_unlock(&all_mddevs_lock); 530 new->hold_active = UNTIL_IOCTL; 531 return new; 532 } 533 } else if (new) { 534 /* find an unused unit number */ 535 static int next_minor = 512; 536 int start = next_minor; 537 int is_free = 0; 538 int dev = 0; 539 while (!is_free) { 540 dev = MKDEV(MD_MAJOR, next_minor); 541 next_minor++; 542 if (next_minor > MINORMASK) 543 next_minor = 0; 544 if (next_minor == start) { 545 /* Oh dear, all in use. */ 546 spin_unlock(&all_mddevs_lock); 547 kfree(new); 548 return NULL; 549 } 550 551 is_free = 1; 552 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 553 if (mddev->unit == dev) { 554 is_free = 0; 555 break; 556 } 557 } 558 new->unit = dev; 559 new->md_minor = MINOR(dev); 560 new->hold_active = UNTIL_STOP; 561 list_add(&new->all_mddevs, &all_mddevs); 562 spin_unlock(&all_mddevs_lock); 563 return new; 564 } 565 spin_unlock(&all_mddevs_lock); 566 567 new = kzalloc(sizeof(*new), GFP_KERNEL); 568 if (!new) 569 return NULL; 570 571 new->unit = unit; 572 if (MAJOR(unit) == MD_MAJOR) 573 new->md_minor = MINOR(unit); 574 else 575 new->md_minor = MINOR(unit) >> MdpMinorShift; 576 577 mddev_init(new); 578 579 goto retry; 580 } 581 582 static struct attribute_group md_redundancy_group; 583 584 void mddev_unlock(struct mddev *mddev) 585 { 586 if (mddev->to_remove) { 587 /* These cannot be removed under reconfig_mutex as 588 * an access to the files will try to take reconfig_mutex 589 * while holding the file unremovable, which leads to 590 * a deadlock. 591 * So hold set sysfs_active while the remove in happeing, 592 * and anything else which might set ->to_remove or my 593 * otherwise change the sysfs namespace will fail with 594 * -EBUSY if sysfs_active is still set. 595 * We set sysfs_active under reconfig_mutex and elsewhere 596 * test it under the same mutex to ensure its correct value 597 * is seen. 598 */ 599 struct attribute_group *to_remove = mddev->to_remove; 600 mddev->to_remove = NULL; 601 mddev->sysfs_active = 1; 602 mutex_unlock(&mddev->reconfig_mutex); 603 604 if (mddev->kobj.sd) { 605 if (to_remove != &md_redundancy_group) 606 sysfs_remove_group(&mddev->kobj, to_remove); 607 if (mddev->pers == NULL || 608 mddev->pers->sync_request == NULL) { 609 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 610 if (mddev->sysfs_action) 611 sysfs_put(mddev->sysfs_action); 612 mddev->sysfs_action = NULL; 613 } 614 } 615 mddev->sysfs_active = 0; 616 } else 617 mutex_unlock(&mddev->reconfig_mutex); 618 619 /* As we've dropped the mutex we need a spinlock to 620 * make sure the thread doesn't disappear 621 */ 622 spin_lock(&pers_lock); 623 md_wakeup_thread(mddev->thread); 624 spin_unlock(&pers_lock); 625 } 626 EXPORT_SYMBOL_GPL(mddev_unlock); 627 628 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) 629 { 630 struct md_rdev *rdev; 631 632 rdev_for_each_rcu(rdev, mddev) 633 if (rdev->desc_nr == nr) 634 return rdev; 635 636 return NULL; 637 } 638 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); 639 640 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) 641 { 642 struct md_rdev *rdev; 643 644 rdev_for_each(rdev, mddev) 645 if (rdev->bdev->bd_dev == dev) 646 return rdev; 647 648 return NULL; 649 } 650 651 static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) 652 { 653 struct md_rdev *rdev; 654 655 rdev_for_each_rcu(rdev, mddev) 656 if (rdev->bdev->bd_dev == dev) 657 return rdev; 658 659 return NULL; 660 } 661 662 static struct md_personality *find_pers(int level, char *clevel) 663 { 664 struct md_personality *pers; 665 list_for_each_entry(pers, &pers_list, list) { 666 if (level != LEVEL_NONE && pers->level == level) 667 return pers; 668 if (strcmp(pers->name, clevel)==0) 669 return pers; 670 } 671 return NULL; 672 } 673 674 /* return the offset of the super block in 512byte sectors */ 675 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) 676 { 677 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; 678 return MD_NEW_SIZE_SECTORS(num_sectors); 679 } 680 681 static int alloc_disk_sb(struct md_rdev *rdev) 682 { 683 rdev->sb_page = alloc_page(GFP_KERNEL); 684 if (!rdev->sb_page) { 685 printk(KERN_ALERT "md: out of memory.\n"); 686 return -ENOMEM; 687 } 688 689 return 0; 690 } 691 692 void md_rdev_clear(struct md_rdev *rdev) 693 { 694 if (rdev->sb_page) { 695 put_page(rdev->sb_page); 696 rdev->sb_loaded = 0; 697 rdev->sb_page = NULL; 698 rdev->sb_start = 0; 699 rdev->sectors = 0; 700 } 701 if (rdev->bb_page) { 702 put_page(rdev->bb_page); 703 rdev->bb_page = NULL; 704 } 705 badblocks_exit(&rdev->badblocks); 706 } 707 EXPORT_SYMBOL_GPL(md_rdev_clear); 708 709 static void super_written(struct bio *bio) 710 { 711 struct md_rdev *rdev = bio->bi_private; 712 struct mddev *mddev = rdev->mddev; 713 714 if (bio->bi_error) { 715 printk("md: super_written gets error=%d\n", bio->bi_error); 716 md_error(mddev, rdev); 717 } 718 719 if (atomic_dec_and_test(&mddev->pending_writes)) 720 wake_up(&mddev->sb_wait); 721 bio_put(bio); 722 } 723 724 void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 725 sector_t sector, int size, struct page *page) 726 { 727 /* write first size bytes of page to sector of rdev 728 * Increment mddev->pending_writes before returning 729 * and decrement it on completion, waking up sb_wait 730 * if zero is reached. 731 * If an error occurred, call md_error 732 */ 733 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); 734 735 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; 736 bio->bi_iter.bi_sector = sector; 737 bio_add_page(bio, page, size, 0); 738 bio->bi_private = rdev; 739 bio->bi_end_io = super_written; 740 741 atomic_inc(&mddev->pending_writes); 742 submit_bio(WRITE_FLUSH_FUA, bio); 743 } 744 745 void md_super_wait(struct mddev *mddev) 746 { 747 /* wait for all superblock writes that were scheduled to complete */ 748 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); 749 } 750 751 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 752 struct page *page, int rw, bool metadata_op) 753 { 754 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); 755 int ret; 756 757 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? 758 rdev->meta_bdev : rdev->bdev; 759 if (metadata_op) 760 bio->bi_iter.bi_sector = sector + rdev->sb_start; 761 else if (rdev->mddev->reshape_position != MaxSector && 762 (rdev->mddev->reshape_backwards == 763 (sector >= rdev->mddev->reshape_position))) 764 bio->bi_iter.bi_sector = sector + rdev->new_data_offset; 765 else 766 bio->bi_iter.bi_sector = sector + rdev->data_offset; 767 bio_add_page(bio, page, size, 0); 768 submit_bio_wait(rw, bio); 769 770 ret = !bio->bi_error; 771 bio_put(bio); 772 return ret; 773 } 774 EXPORT_SYMBOL_GPL(sync_page_io); 775 776 static int read_disk_sb(struct md_rdev *rdev, int size) 777 { 778 char b[BDEVNAME_SIZE]; 779 780 if (rdev->sb_loaded) 781 return 0; 782 783 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) 784 goto fail; 785 rdev->sb_loaded = 1; 786 return 0; 787 788 fail: 789 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", 790 bdevname(rdev->bdev,b)); 791 return -EINVAL; 792 } 793 794 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 795 { 796 return sb1->set_uuid0 == sb2->set_uuid0 && 797 sb1->set_uuid1 == sb2->set_uuid1 && 798 sb1->set_uuid2 == sb2->set_uuid2 && 799 sb1->set_uuid3 == sb2->set_uuid3; 800 } 801 802 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 803 { 804 int ret; 805 mdp_super_t *tmp1, *tmp2; 806 807 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 808 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 809 810 if (!tmp1 || !tmp2) { 811 ret = 0; 812 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); 813 goto abort; 814 } 815 816 *tmp1 = *sb1; 817 *tmp2 = *sb2; 818 819 /* 820 * nr_disks is not constant 821 */ 822 tmp1->nr_disks = 0; 823 tmp2->nr_disks = 0; 824 825 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); 826 abort: 827 kfree(tmp1); 828 kfree(tmp2); 829 return ret; 830 } 831 832 static u32 md_csum_fold(u32 csum) 833 { 834 csum = (csum & 0xffff) + (csum >> 16); 835 return (csum & 0xffff) + (csum >> 16); 836 } 837 838 static unsigned int calc_sb_csum(mdp_super_t *sb) 839 { 840 u64 newcsum = 0; 841 u32 *sb32 = (u32*)sb; 842 int i; 843 unsigned int disk_csum, csum; 844 845 disk_csum = sb->sb_csum; 846 sb->sb_csum = 0; 847 848 for (i = 0; i < MD_SB_BYTES/4 ; i++) 849 newcsum += sb32[i]; 850 csum = (newcsum & 0xffffffff) + (newcsum>>32); 851 852 #ifdef CONFIG_ALPHA 853 /* This used to use csum_partial, which was wrong for several 854 * reasons including that different results are returned on 855 * different architectures. It isn't critical that we get exactly 856 * the same return value as before (we always csum_fold before 857 * testing, and that removes any differences). However as we 858 * know that csum_partial always returned a 16bit value on 859 * alphas, do a fold to maximise conformity to previous behaviour. 860 */ 861 sb->sb_csum = md_csum_fold(disk_csum); 862 #else 863 sb->sb_csum = disk_csum; 864 #endif 865 return csum; 866 } 867 868 /* 869 * Handle superblock details. 870 * We want to be able to handle multiple superblock formats 871 * so we have a common interface to them all, and an array of 872 * different handlers. 873 * We rely on user-space to write the initial superblock, and support 874 * reading and updating of superblocks. 875 * Interface methods are: 876 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) 877 * loads and validates a superblock on dev. 878 * if refdev != NULL, compare superblocks on both devices 879 * Return: 880 * 0 - dev has a superblock that is compatible with refdev 881 * 1 - dev has a superblock that is compatible and newer than refdev 882 * so dev should be used as the refdev in future 883 * -EINVAL superblock incompatible or invalid 884 * -othererror e.g. -EIO 885 * 886 * int validate_super(struct mddev *mddev, struct md_rdev *dev) 887 * Verify that dev is acceptable into mddev. 888 * The first time, mddev->raid_disks will be 0, and data from 889 * dev should be merged in. Subsequent calls check that dev 890 * is new enough. Return 0 or -EINVAL 891 * 892 * void sync_super(struct mddev *mddev, struct md_rdev *dev) 893 * Update the superblock for rdev with data in mddev 894 * This does not write to disc. 895 * 896 */ 897 898 struct super_type { 899 char *name; 900 struct module *owner; 901 int (*load_super)(struct md_rdev *rdev, 902 struct md_rdev *refdev, 903 int minor_version); 904 int (*validate_super)(struct mddev *mddev, 905 struct md_rdev *rdev); 906 void (*sync_super)(struct mddev *mddev, 907 struct md_rdev *rdev); 908 unsigned long long (*rdev_size_change)(struct md_rdev *rdev, 909 sector_t num_sectors); 910 int (*allow_new_offset)(struct md_rdev *rdev, 911 unsigned long long new_offset); 912 }; 913 914 /* 915 * Check that the given mddev has no bitmap. 916 * 917 * This function is called from the run method of all personalities that do not 918 * support bitmaps. It prints an error message and returns non-zero if mddev 919 * has a bitmap. Otherwise, it returns 0. 920 * 921 */ 922 int md_check_no_bitmap(struct mddev *mddev) 923 { 924 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) 925 return 0; 926 printk(KERN_ERR "%s: bitmaps are not supported for %s\n", 927 mdname(mddev), mddev->pers->name); 928 return 1; 929 } 930 EXPORT_SYMBOL(md_check_no_bitmap); 931 932 /* 933 * load_super for 0.90.0 934 */ 935 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 936 { 937 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 938 mdp_super_t *sb; 939 int ret; 940 941 /* 942 * Calculate the position of the superblock (512byte sectors), 943 * it's at the end of the disk. 944 * 945 * It also happens to be a multiple of 4Kb. 946 */ 947 rdev->sb_start = calc_dev_sboffset(rdev); 948 949 ret = read_disk_sb(rdev, MD_SB_BYTES); 950 if (ret) return ret; 951 952 ret = -EINVAL; 953 954 bdevname(rdev->bdev, b); 955 sb = page_address(rdev->sb_page); 956 957 if (sb->md_magic != MD_SB_MAGIC) { 958 printk(KERN_ERR "md: invalid raid superblock magic on %s\n", 959 b); 960 goto abort; 961 } 962 963 if (sb->major_version != 0 || 964 sb->minor_version < 90 || 965 sb->minor_version > 91) { 966 printk(KERN_WARNING "Bad version number %d.%d on %s\n", 967 sb->major_version, sb->minor_version, 968 b); 969 goto abort; 970 } 971 972 if (sb->raid_disks <= 0) 973 goto abort; 974 975 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { 976 printk(KERN_WARNING "md: invalid superblock checksum on %s\n", 977 b); 978 goto abort; 979 } 980 981 rdev->preferred_minor = sb->md_minor; 982 rdev->data_offset = 0; 983 rdev->new_data_offset = 0; 984 rdev->sb_size = MD_SB_BYTES; 985 rdev->badblocks.shift = -1; 986 987 if (sb->level == LEVEL_MULTIPATH) 988 rdev->desc_nr = -1; 989 else 990 rdev->desc_nr = sb->this_disk.number; 991 992 if (!refdev) { 993 ret = 1; 994 } else { 995 __u64 ev1, ev2; 996 mdp_super_t *refsb = page_address(refdev->sb_page); 997 if (!uuid_equal(refsb, sb)) { 998 printk(KERN_WARNING "md: %s has different UUID to %s\n", 999 b, bdevname(refdev->bdev,b2)); 1000 goto abort; 1001 } 1002 if (!sb_equal(refsb, sb)) { 1003 printk(KERN_WARNING "md: %s has same UUID" 1004 " but different superblock to %s\n", 1005 b, bdevname(refdev->bdev, b2)); 1006 goto abort; 1007 } 1008 ev1 = md_event(sb); 1009 ev2 = md_event(refsb); 1010 if (ev1 > ev2) 1011 ret = 1; 1012 else 1013 ret = 0; 1014 } 1015 rdev->sectors = rdev->sb_start; 1016 /* Limit to 4TB as metadata cannot record more than that. 1017 * (not needed for Linear and RAID0 as metadata doesn't 1018 * record this size) 1019 */ 1020 if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) && 1021 sb->level >= 1) 1022 rdev->sectors = (sector_t)(2ULL << 32) - 2; 1023 1024 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) 1025 /* "this cannot possibly happen" ... */ 1026 ret = -EINVAL; 1027 1028 abort: 1029 return ret; 1030 } 1031 1032 /* 1033 * validate_super for 0.90.0 1034 */ 1035 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) 1036 { 1037 mdp_disk_t *desc; 1038 mdp_super_t *sb = page_address(rdev->sb_page); 1039 __u64 ev1 = md_event(sb); 1040 1041 rdev->raid_disk = -1; 1042 clear_bit(Faulty, &rdev->flags); 1043 clear_bit(In_sync, &rdev->flags); 1044 clear_bit(Bitmap_sync, &rdev->flags); 1045 clear_bit(WriteMostly, &rdev->flags); 1046 1047 if (mddev->raid_disks == 0) { 1048 mddev->major_version = 0; 1049 mddev->minor_version = sb->minor_version; 1050 mddev->patch_version = sb->patch_version; 1051 mddev->external = 0; 1052 mddev->chunk_sectors = sb->chunk_size >> 9; 1053 mddev->ctime = sb->ctime; 1054 mddev->utime = sb->utime; 1055 mddev->level = sb->level; 1056 mddev->clevel[0] = 0; 1057 mddev->layout = sb->layout; 1058 mddev->raid_disks = sb->raid_disks; 1059 mddev->dev_sectors = ((sector_t)sb->size) * 2; 1060 mddev->events = ev1; 1061 mddev->bitmap_info.offset = 0; 1062 mddev->bitmap_info.space = 0; 1063 /* bitmap can use 60 K after the 4K superblocks */ 1064 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 1065 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); 1066 mddev->reshape_backwards = 0; 1067 1068 if (mddev->minor_version >= 91) { 1069 mddev->reshape_position = sb->reshape_position; 1070 mddev->delta_disks = sb->delta_disks; 1071 mddev->new_level = sb->new_level; 1072 mddev->new_layout = sb->new_layout; 1073 mddev->new_chunk_sectors = sb->new_chunk >> 9; 1074 if (mddev->delta_disks < 0) 1075 mddev->reshape_backwards = 1; 1076 } else { 1077 mddev->reshape_position = MaxSector; 1078 mddev->delta_disks = 0; 1079 mddev->new_level = mddev->level; 1080 mddev->new_layout = mddev->layout; 1081 mddev->new_chunk_sectors = mddev->chunk_sectors; 1082 } 1083 1084 if (sb->state & (1<<MD_SB_CLEAN)) 1085 mddev->recovery_cp = MaxSector; 1086 else { 1087 if (sb->events_hi == sb->cp_events_hi && 1088 sb->events_lo == sb->cp_events_lo) { 1089 mddev->recovery_cp = sb->recovery_cp; 1090 } else 1091 mddev->recovery_cp = 0; 1092 } 1093 1094 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 1095 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 1096 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 1097 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 1098 1099 mddev->max_disks = MD_SB_DISKS; 1100 1101 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 1102 mddev->bitmap_info.file == NULL) { 1103 mddev->bitmap_info.offset = 1104 mddev->bitmap_info.default_offset; 1105 mddev->bitmap_info.space = 1106 mddev->bitmap_info.default_space; 1107 } 1108 1109 } else if (mddev->pers == NULL) { 1110 /* Insist on good event counter while assembling, except 1111 * for spares (which don't need an event count) */ 1112 ++ev1; 1113 if (sb->disks[rdev->desc_nr].state & ( 1114 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) 1115 if (ev1 < mddev->events) 1116 return -EINVAL; 1117 } else if (mddev->bitmap) { 1118 /* if adding to array with a bitmap, then we can accept an 1119 * older device ... but not too old. 1120 */ 1121 if (ev1 < mddev->bitmap->events_cleared) 1122 return 0; 1123 if (ev1 < mddev->events) 1124 set_bit(Bitmap_sync, &rdev->flags); 1125 } else { 1126 if (ev1 < mddev->events) 1127 /* just a hot-add of a new device, leave raid_disk at -1 */ 1128 return 0; 1129 } 1130 1131 if (mddev->level != LEVEL_MULTIPATH) { 1132 desc = sb->disks + rdev->desc_nr; 1133 1134 if (desc->state & (1<<MD_DISK_FAULTY)) 1135 set_bit(Faulty, &rdev->flags); 1136 else if (desc->state & (1<<MD_DISK_SYNC) /* && 1137 desc->raid_disk < mddev->raid_disks */) { 1138 set_bit(In_sync, &rdev->flags); 1139 rdev->raid_disk = desc->raid_disk; 1140 rdev->saved_raid_disk = desc->raid_disk; 1141 } else if (desc->state & (1<<MD_DISK_ACTIVE)) { 1142 /* active but not in sync implies recovery up to 1143 * reshape position. We don't know exactly where 1144 * that is, so set to zero for now */ 1145 if (mddev->minor_version >= 91) { 1146 rdev->recovery_offset = 0; 1147 rdev->raid_disk = desc->raid_disk; 1148 } 1149 } 1150 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 1151 set_bit(WriteMostly, &rdev->flags); 1152 } else /* MULTIPATH are always insync */ 1153 set_bit(In_sync, &rdev->flags); 1154 return 0; 1155 } 1156 1157 /* 1158 * sync_super for 0.90.0 1159 */ 1160 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) 1161 { 1162 mdp_super_t *sb; 1163 struct md_rdev *rdev2; 1164 int next_spare = mddev->raid_disks; 1165 1166 /* make rdev->sb match mddev data.. 1167 * 1168 * 1/ zero out disks 1169 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 1170 * 3/ any empty disks < next_spare become removed 1171 * 1172 * disks[0] gets initialised to REMOVED because 1173 * we cannot be sure from other fields if it has 1174 * been initialised or not. 1175 */ 1176 int i; 1177 int active=0, working=0,failed=0,spare=0,nr_disks=0; 1178 1179 rdev->sb_size = MD_SB_BYTES; 1180 1181 sb = page_address(rdev->sb_page); 1182 1183 memset(sb, 0, sizeof(*sb)); 1184 1185 sb->md_magic = MD_SB_MAGIC; 1186 sb->major_version = mddev->major_version; 1187 sb->patch_version = mddev->patch_version; 1188 sb->gvalid_words = 0; /* ignored */ 1189 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 1190 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 1191 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 1192 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 1193 1194 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); 1195 sb->level = mddev->level; 1196 sb->size = mddev->dev_sectors / 2; 1197 sb->raid_disks = mddev->raid_disks; 1198 sb->md_minor = mddev->md_minor; 1199 sb->not_persistent = 0; 1200 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); 1201 sb->state = 0; 1202 sb->events_hi = (mddev->events>>32); 1203 sb->events_lo = (u32)mddev->events; 1204 1205 if (mddev->reshape_position == MaxSector) 1206 sb->minor_version = 90; 1207 else { 1208 sb->minor_version = 91; 1209 sb->reshape_position = mddev->reshape_position; 1210 sb->new_level = mddev->new_level; 1211 sb->delta_disks = mddev->delta_disks; 1212 sb->new_layout = mddev->new_layout; 1213 sb->new_chunk = mddev->new_chunk_sectors << 9; 1214 } 1215 mddev->minor_version = sb->minor_version; 1216 if (mddev->in_sync) 1217 { 1218 sb->recovery_cp = mddev->recovery_cp; 1219 sb->cp_events_hi = (mddev->events>>32); 1220 sb->cp_events_lo = (u32)mddev->events; 1221 if (mddev->recovery_cp == MaxSector) 1222 sb->state = (1<< MD_SB_CLEAN); 1223 } else 1224 sb->recovery_cp = 0; 1225 1226 sb->layout = mddev->layout; 1227 sb->chunk_size = mddev->chunk_sectors << 9; 1228 1229 if (mddev->bitmap && mddev->bitmap_info.file == NULL) 1230 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 1231 1232 sb->disks[0].state = (1<<MD_DISK_REMOVED); 1233 rdev_for_each(rdev2, mddev) { 1234 mdp_disk_t *d; 1235 int desc_nr; 1236 int is_active = test_bit(In_sync, &rdev2->flags); 1237 1238 if (rdev2->raid_disk >= 0 && 1239 sb->minor_version >= 91) 1240 /* we have nowhere to store the recovery_offset, 1241 * but if it is not below the reshape_position, 1242 * we can piggy-back on that. 1243 */ 1244 is_active = 1; 1245 if (rdev2->raid_disk < 0 || 1246 test_bit(Faulty, &rdev2->flags)) 1247 is_active = 0; 1248 if (is_active) 1249 desc_nr = rdev2->raid_disk; 1250 else 1251 desc_nr = next_spare++; 1252 rdev2->desc_nr = desc_nr; 1253 d = &sb->disks[rdev2->desc_nr]; 1254 nr_disks++; 1255 d->number = rdev2->desc_nr; 1256 d->major = MAJOR(rdev2->bdev->bd_dev); 1257 d->minor = MINOR(rdev2->bdev->bd_dev); 1258 if (is_active) 1259 d->raid_disk = rdev2->raid_disk; 1260 else 1261 d->raid_disk = rdev2->desc_nr; /* compatibility */ 1262 if (test_bit(Faulty, &rdev2->flags)) 1263 d->state = (1<<MD_DISK_FAULTY); 1264 else if (is_active) { 1265 d->state = (1<<MD_DISK_ACTIVE); 1266 if (test_bit(In_sync, &rdev2->flags)) 1267 d->state |= (1<<MD_DISK_SYNC); 1268 active++; 1269 working++; 1270 } else { 1271 d->state = 0; 1272 spare++; 1273 working++; 1274 } 1275 if (test_bit(WriteMostly, &rdev2->flags)) 1276 d->state |= (1<<MD_DISK_WRITEMOSTLY); 1277 } 1278 /* now set the "removed" and "faulty" bits on any missing devices */ 1279 for (i=0 ; i < mddev->raid_disks ; i++) { 1280 mdp_disk_t *d = &sb->disks[i]; 1281 if (d->state == 0 && d->number == 0) { 1282 d->number = i; 1283 d->raid_disk = i; 1284 d->state = (1<<MD_DISK_REMOVED); 1285 d->state |= (1<<MD_DISK_FAULTY); 1286 failed++; 1287 } 1288 } 1289 sb->nr_disks = nr_disks; 1290 sb->active_disks = active; 1291 sb->working_disks = working; 1292 sb->failed_disks = failed; 1293 sb->spare_disks = spare; 1294 1295 sb->this_disk = sb->disks[rdev->desc_nr]; 1296 sb->sb_csum = calc_sb_csum(sb); 1297 } 1298 1299 /* 1300 * rdev_size_change for 0.90.0 1301 */ 1302 static unsigned long long 1303 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1304 { 1305 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1306 return 0; /* component must fit device */ 1307 if (rdev->mddev->bitmap_info.offset) 1308 return 0; /* can't move bitmap */ 1309 rdev->sb_start = calc_dev_sboffset(rdev); 1310 if (!num_sectors || num_sectors > rdev->sb_start) 1311 num_sectors = rdev->sb_start; 1312 /* Limit to 4TB as metadata cannot record more than that. 1313 * 4TB == 2^32 KB, or 2*2^32 sectors. 1314 */ 1315 if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) && 1316 rdev->mddev->level >= 1) 1317 num_sectors = (sector_t)(2ULL << 32) - 2; 1318 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1319 rdev->sb_page); 1320 md_super_wait(rdev->mddev); 1321 return num_sectors; 1322 } 1323 1324 static int 1325 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) 1326 { 1327 /* non-zero offset changes not possible with v0.90 */ 1328 return new_offset == 0; 1329 } 1330 1331 /* 1332 * version 1 superblock 1333 */ 1334 1335 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) 1336 { 1337 __le32 disk_csum; 1338 u32 csum; 1339 unsigned long long newcsum; 1340 int size = 256 + le32_to_cpu(sb->max_dev)*2; 1341 __le32 *isuper = (__le32*)sb; 1342 1343 disk_csum = sb->sb_csum; 1344 sb->sb_csum = 0; 1345 newcsum = 0; 1346 for (; size >= 4; size -= 4) 1347 newcsum += le32_to_cpu(*isuper++); 1348 1349 if (size == 2) 1350 newcsum += le16_to_cpu(*(__le16*) isuper); 1351 1352 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 1353 sb->sb_csum = disk_csum; 1354 return cpu_to_le32(csum); 1355 } 1356 1357 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 1358 { 1359 struct mdp_superblock_1 *sb; 1360 int ret; 1361 sector_t sb_start; 1362 sector_t sectors; 1363 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1364 int bmask; 1365 1366 /* 1367 * Calculate the position of the superblock in 512byte sectors. 1368 * It is always aligned to a 4K boundary and 1369 * depeding on minor_version, it can be: 1370 * 0: At least 8K, but less than 12K, from end of device 1371 * 1: At start of device 1372 * 2: 4K from start of device. 1373 */ 1374 switch(minor_version) { 1375 case 0: 1376 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; 1377 sb_start -= 8*2; 1378 sb_start &= ~(sector_t)(4*2-1); 1379 break; 1380 case 1: 1381 sb_start = 0; 1382 break; 1383 case 2: 1384 sb_start = 8; 1385 break; 1386 default: 1387 return -EINVAL; 1388 } 1389 rdev->sb_start = sb_start; 1390 1391 /* superblock is rarely larger than 1K, but it can be larger, 1392 * and it is safe to read 4k, so we do that 1393 */ 1394 ret = read_disk_sb(rdev, 4096); 1395 if (ret) return ret; 1396 1397 sb = page_address(rdev->sb_page); 1398 1399 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 1400 sb->major_version != cpu_to_le32(1) || 1401 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 1402 le64_to_cpu(sb->super_offset) != rdev->sb_start || 1403 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 1404 return -EINVAL; 1405 1406 if (calc_sb_1_csum(sb) != sb->sb_csum) { 1407 printk("md: invalid superblock checksum on %s\n", 1408 bdevname(rdev->bdev,b)); 1409 return -EINVAL; 1410 } 1411 if (le64_to_cpu(sb->data_size) < 10) { 1412 printk("md: data_size too small on %s\n", 1413 bdevname(rdev->bdev,b)); 1414 return -EINVAL; 1415 } 1416 if (sb->pad0 || 1417 sb->pad3[0] || 1418 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) 1419 /* Some padding is non-zero, might be a new feature */ 1420 return -EINVAL; 1421 1422 rdev->preferred_minor = 0xffff; 1423 rdev->data_offset = le64_to_cpu(sb->data_offset); 1424 rdev->new_data_offset = rdev->data_offset; 1425 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && 1426 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) 1427 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); 1428 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); 1429 1430 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 1431 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1432 if (rdev->sb_size & bmask) 1433 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1434 1435 if (minor_version 1436 && rdev->data_offset < sb_start + (rdev->sb_size/512)) 1437 return -EINVAL; 1438 if (minor_version 1439 && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) 1440 return -EINVAL; 1441 1442 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) 1443 rdev->desc_nr = -1; 1444 else 1445 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1446 1447 if (!rdev->bb_page) { 1448 rdev->bb_page = alloc_page(GFP_KERNEL); 1449 if (!rdev->bb_page) 1450 return -ENOMEM; 1451 } 1452 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && 1453 rdev->badblocks.count == 0) { 1454 /* need to load the bad block list. 1455 * Currently we limit it to one page. 1456 */ 1457 s32 offset; 1458 sector_t bb_sector; 1459 u64 *bbp; 1460 int i; 1461 int sectors = le16_to_cpu(sb->bblog_size); 1462 if (sectors > (PAGE_SIZE / 512)) 1463 return -EINVAL; 1464 offset = le32_to_cpu(sb->bblog_offset); 1465 if (offset == 0) 1466 return -EINVAL; 1467 bb_sector = (long long)offset; 1468 if (!sync_page_io(rdev, bb_sector, sectors << 9, 1469 rdev->bb_page, READ, true)) 1470 return -EIO; 1471 bbp = (u64 *)page_address(rdev->bb_page); 1472 rdev->badblocks.shift = sb->bblog_shift; 1473 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { 1474 u64 bb = le64_to_cpu(*bbp); 1475 int count = bb & (0x3ff); 1476 u64 sector = bb >> 10; 1477 sector <<= sb->bblog_shift; 1478 count <<= sb->bblog_shift; 1479 if (bb + 1 == 0) 1480 break; 1481 if (badblocks_set(&rdev->badblocks, sector, count, 1)) 1482 return -EINVAL; 1483 } 1484 } else if (sb->bblog_offset != 0) 1485 rdev->badblocks.shift = 0; 1486 1487 if (!refdev) { 1488 ret = 1; 1489 } else { 1490 __u64 ev1, ev2; 1491 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); 1492 1493 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 1494 sb->level != refsb->level || 1495 sb->layout != refsb->layout || 1496 sb->chunksize != refsb->chunksize) { 1497 printk(KERN_WARNING "md: %s has strangely different" 1498 " superblock to %s\n", 1499 bdevname(rdev->bdev,b), 1500 bdevname(refdev->bdev,b2)); 1501 return -EINVAL; 1502 } 1503 ev1 = le64_to_cpu(sb->events); 1504 ev2 = le64_to_cpu(refsb->events); 1505 1506 if (ev1 > ev2) 1507 ret = 1; 1508 else 1509 ret = 0; 1510 } 1511 if (minor_version) { 1512 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); 1513 sectors -= rdev->data_offset; 1514 } else 1515 sectors = rdev->sb_start; 1516 if (sectors < le64_to_cpu(sb->data_size)) 1517 return -EINVAL; 1518 rdev->sectors = le64_to_cpu(sb->data_size); 1519 return ret; 1520 } 1521 1522 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) 1523 { 1524 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 1525 __u64 ev1 = le64_to_cpu(sb->events); 1526 1527 rdev->raid_disk = -1; 1528 clear_bit(Faulty, &rdev->flags); 1529 clear_bit(In_sync, &rdev->flags); 1530 clear_bit(Bitmap_sync, &rdev->flags); 1531 clear_bit(WriteMostly, &rdev->flags); 1532 1533 if (mddev->raid_disks == 0) { 1534 mddev->major_version = 1; 1535 mddev->patch_version = 0; 1536 mddev->external = 0; 1537 mddev->chunk_sectors = le32_to_cpu(sb->chunksize); 1538 mddev->ctime = le64_to_cpu(sb->ctime); 1539 mddev->utime = le64_to_cpu(sb->utime); 1540 mddev->level = le32_to_cpu(sb->level); 1541 mddev->clevel[0] = 0; 1542 mddev->layout = le32_to_cpu(sb->layout); 1543 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1544 mddev->dev_sectors = le64_to_cpu(sb->size); 1545 mddev->events = ev1; 1546 mddev->bitmap_info.offset = 0; 1547 mddev->bitmap_info.space = 0; 1548 /* Default location for bitmap is 1K after superblock 1549 * using 3K - total of 4K 1550 */ 1551 mddev->bitmap_info.default_offset = 1024 >> 9; 1552 mddev->bitmap_info.default_space = (4096-1024) >> 9; 1553 mddev->reshape_backwards = 0; 1554 1555 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1556 memcpy(mddev->uuid, sb->set_uuid, 16); 1557 1558 mddev->max_disks = (4096-256)/2; 1559 1560 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1561 mddev->bitmap_info.file == NULL) { 1562 mddev->bitmap_info.offset = 1563 (__s32)le32_to_cpu(sb->bitmap_offset); 1564 /* Metadata doesn't record how much space is available. 1565 * For 1.0, we assume we can use up to the superblock 1566 * if before, else to 4K beyond superblock. 1567 * For others, assume no change is possible. 1568 */ 1569 if (mddev->minor_version > 0) 1570 mddev->bitmap_info.space = 0; 1571 else if (mddev->bitmap_info.offset > 0) 1572 mddev->bitmap_info.space = 1573 8 - mddev->bitmap_info.offset; 1574 else 1575 mddev->bitmap_info.space = 1576 -mddev->bitmap_info.offset; 1577 } 1578 1579 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { 1580 mddev->reshape_position = le64_to_cpu(sb->reshape_position); 1581 mddev->delta_disks = le32_to_cpu(sb->delta_disks); 1582 mddev->new_level = le32_to_cpu(sb->new_level); 1583 mddev->new_layout = le32_to_cpu(sb->new_layout); 1584 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); 1585 if (mddev->delta_disks < 0 || 1586 (mddev->delta_disks == 0 && 1587 (le32_to_cpu(sb->feature_map) 1588 & MD_FEATURE_RESHAPE_BACKWARDS))) 1589 mddev->reshape_backwards = 1; 1590 } else { 1591 mddev->reshape_position = MaxSector; 1592 mddev->delta_disks = 0; 1593 mddev->new_level = mddev->level; 1594 mddev->new_layout = mddev->layout; 1595 mddev->new_chunk_sectors = mddev->chunk_sectors; 1596 } 1597 1598 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) { 1599 set_bit(MD_HAS_JOURNAL, &mddev->flags); 1600 if (mddev->recovery_cp == MaxSector) 1601 set_bit(MD_JOURNAL_CLEAN, &mddev->flags); 1602 } 1603 } else if (mddev->pers == NULL) { 1604 /* Insist of good event counter while assembling, except for 1605 * spares (which don't need an event count) */ 1606 ++ev1; 1607 if (rdev->desc_nr >= 0 && 1608 rdev->desc_nr < le32_to_cpu(sb->max_dev) && 1609 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || 1610 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) 1611 if (ev1 < mddev->events) 1612 return -EINVAL; 1613 } else if (mddev->bitmap) { 1614 /* If adding to array with a bitmap, then we can accept an 1615 * older device, but not too old. 1616 */ 1617 if (ev1 < mddev->bitmap->events_cleared) 1618 return 0; 1619 if (ev1 < mddev->events) 1620 set_bit(Bitmap_sync, &rdev->flags); 1621 } else { 1622 if (ev1 < mddev->events) 1623 /* just a hot-add of a new device, leave raid_disk at -1 */ 1624 return 0; 1625 } 1626 if (mddev->level != LEVEL_MULTIPATH) { 1627 int role; 1628 if (rdev->desc_nr < 0 || 1629 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { 1630 role = MD_DISK_ROLE_SPARE; 1631 rdev->desc_nr = -1; 1632 } else 1633 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1634 switch(role) { 1635 case MD_DISK_ROLE_SPARE: /* spare */ 1636 break; 1637 case MD_DISK_ROLE_FAULTY: /* faulty */ 1638 set_bit(Faulty, &rdev->flags); 1639 break; 1640 case MD_DISK_ROLE_JOURNAL: /* journal device */ 1641 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { 1642 /* journal device without journal feature */ 1643 printk(KERN_WARNING 1644 "md: journal device provided without journal feature, ignoring the device\n"); 1645 return -EINVAL; 1646 } 1647 set_bit(Journal, &rdev->flags); 1648 rdev->journal_tail = le64_to_cpu(sb->journal_tail); 1649 rdev->raid_disk = 0; 1650 break; 1651 default: 1652 rdev->saved_raid_disk = role; 1653 if ((le32_to_cpu(sb->feature_map) & 1654 MD_FEATURE_RECOVERY_OFFSET)) { 1655 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 1656 if (!(le32_to_cpu(sb->feature_map) & 1657 MD_FEATURE_RECOVERY_BITMAP)) 1658 rdev->saved_raid_disk = -1; 1659 } else 1660 set_bit(In_sync, &rdev->flags); 1661 rdev->raid_disk = role; 1662 break; 1663 } 1664 if (sb->devflags & WriteMostly1) 1665 set_bit(WriteMostly, &rdev->flags); 1666 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) 1667 set_bit(Replacement, &rdev->flags); 1668 } else /* MULTIPATH are always insync */ 1669 set_bit(In_sync, &rdev->flags); 1670 1671 return 0; 1672 } 1673 1674 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) 1675 { 1676 struct mdp_superblock_1 *sb; 1677 struct md_rdev *rdev2; 1678 int max_dev, i; 1679 /* make rdev->sb match mddev and rdev data. */ 1680 1681 sb = page_address(rdev->sb_page); 1682 1683 sb->feature_map = 0; 1684 sb->pad0 = 0; 1685 sb->recovery_offset = cpu_to_le64(0); 1686 memset(sb->pad3, 0, sizeof(sb->pad3)); 1687 1688 sb->utime = cpu_to_le64((__u64)mddev->utime); 1689 sb->events = cpu_to_le64(mddev->events); 1690 if (mddev->in_sync) 1691 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1692 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) 1693 sb->resync_offset = cpu_to_le64(MaxSector); 1694 else 1695 sb->resync_offset = cpu_to_le64(0); 1696 1697 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); 1698 1699 sb->raid_disks = cpu_to_le32(mddev->raid_disks); 1700 sb->size = cpu_to_le64(mddev->dev_sectors); 1701 sb->chunksize = cpu_to_le32(mddev->chunk_sectors); 1702 sb->level = cpu_to_le32(mddev->level); 1703 sb->layout = cpu_to_le32(mddev->layout); 1704 1705 if (test_bit(WriteMostly, &rdev->flags)) 1706 sb->devflags |= WriteMostly1; 1707 else 1708 sb->devflags &= ~WriteMostly1; 1709 sb->data_offset = cpu_to_le64(rdev->data_offset); 1710 sb->data_size = cpu_to_le64(rdev->sectors); 1711 1712 if (mddev->bitmap && mddev->bitmap_info.file == NULL) { 1713 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); 1714 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1715 } 1716 1717 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && 1718 !test_bit(In_sync, &rdev->flags)) { 1719 sb->feature_map |= 1720 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); 1721 sb->recovery_offset = 1722 cpu_to_le64(rdev->recovery_offset); 1723 if (rdev->saved_raid_disk >= 0 && mddev->bitmap) 1724 sb->feature_map |= 1725 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); 1726 } 1727 /* Note: recovery_offset and journal_tail share space */ 1728 if (test_bit(Journal, &rdev->flags)) 1729 sb->journal_tail = cpu_to_le64(rdev->journal_tail); 1730 if (test_bit(Replacement, &rdev->flags)) 1731 sb->feature_map |= 1732 cpu_to_le32(MD_FEATURE_REPLACEMENT); 1733 1734 if (mddev->reshape_position != MaxSector) { 1735 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); 1736 sb->reshape_position = cpu_to_le64(mddev->reshape_position); 1737 sb->new_layout = cpu_to_le32(mddev->new_layout); 1738 sb->delta_disks = cpu_to_le32(mddev->delta_disks); 1739 sb->new_level = cpu_to_le32(mddev->new_level); 1740 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); 1741 if (mddev->delta_disks == 0 && 1742 mddev->reshape_backwards) 1743 sb->feature_map 1744 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); 1745 if (rdev->new_data_offset != rdev->data_offset) { 1746 sb->feature_map 1747 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); 1748 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset 1749 - rdev->data_offset)); 1750 } 1751 } 1752 1753 if (mddev_is_clustered(mddev)) 1754 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); 1755 1756 if (rdev->badblocks.count == 0) 1757 /* Nothing to do for bad blocks*/ ; 1758 else if (sb->bblog_offset == 0) 1759 /* Cannot record bad blocks on this device */ 1760 md_error(mddev, rdev); 1761 else { 1762 struct badblocks *bb = &rdev->badblocks; 1763 u64 *bbp = (u64 *)page_address(rdev->bb_page); 1764 u64 *p = bb->page; 1765 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); 1766 if (bb->changed) { 1767 unsigned seq; 1768 1769 retry: 1770 seq = read_seqbegin(&bb->lock); 1771 1772 memset(bbp, 0xff, PAGE_SIZE); 1773 1774 for (i = 0 ; i < bb->count ; i++) { 1775 u64 internal_bb = p[i]; 1776 u64 store_bb = ((BB_OFFSET(internal_bb) << 10) 1777 | BB_LEN(internal_bb)); 1778 bbp[i] = cpu_to_le64(store_bb); 1779 } 1780 bb->changed = 0; 1781 if (read_seqretry(&bb->lock, seq)) 1782 goto retry; 1783 1784 bb->sector = (rdev->sb_start + 1785 (int)le32_to_cpu(sb->bblog_offset)); 1786 bb->size = le16_to_cpu(sb->bblog_size); 1787 } 1788 } 1789 1790 max_dev = 0; 1791 rdev_for_each(rdev2, mddev) 1792 if (rdev2->desc_nr+1 > max_dev) 1793 max_dev = rdev2->desc_nr+1; 1794 1795 if (max_dev > le32_to_cpu(sb->max_dev)) { 1796 int bmask; 1797 sb->max_dev = cpu_to_le32(max_dev); 1798 rdev->sb_size = max_dev * 2 + 256; 1799 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1800 if (rdev->sb_size & bmask) 1801 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1802 } else 1803 max_dev = le32_to_cpu(sb->max_dev); 1804 1805 for (i=0; i<max_dev;i++) 1806 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); 1807 1808 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) 1809 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); 1810 1811 rdev_for_each(rdev2, mddev) { 1812 i = rdev2->desc_nr; 1813 if (test_bit(Faulty, &rdev2->flags)) 1814 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); 1815 else if (test_bit(In_sync, &rdev2->flags)) 1816 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1817 else if (test_bit(Journal, &rdev2->flags)) 1818 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); 1819 else if (rdev2->raid_disk >= 0) 1820 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1821 else 1822 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); 1823 } 1824 1825 sb->sb_csum = calc_sb_1_csum(sb); 1826 } 1827 1828 static unsigned long long 1829 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1830 { 1831 struct mdp_superblock_1 *sb; 1832 sector_t max_sectors; 1833 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1834 return 0; /* component must fit device */ 1835 if (rdev->data_offset != rdev->new_data_offset) 1836 return 0; /* too confusing */ 1837 if (rdev->sb_start < rdev->data_offset) { 1838 /* minor versions 1 and 2; superblock before data */ 1839 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; 1840 max_sectors -= rdev->data_offset; 1841 if (!num_sectors || num_sectors > max_sectors) 1842 num_sectors = max_sectors; 1843 } else if (rdev->mddev->bitmap_info.offset) { 1844 /* minor version 0 with bitmap we can't move */ 1845 return 0; 1846 } else { 1847 /* minor version 0; superblock after data */ 1848 sector_t sb_start; 1849 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; 1850 sb_start &= ~(sector_t)(4*2 - 1); 1851 max_sectors = rdev->sectors + sb_start - rdev->sb_start; 1852 if (!num_sectors || num_sectors > max_sectors) 1853 num_sectors = max_sectors; 1854 rdev->sb_start = sb_start; 1855 } 1856 sb = page_address(rdev->sb_page); 1857 sb->data_size = cpu_to_le64(num_sectors); 1858 sb->super_offset = rdev->sb_start; 1859 sb->sb_csum = calc_sb_1_csum(sb); 1860 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1861 rdev->sb_page); 1862 md_super_wait(rdev->mddev); 1863 return num_sectors; 1864 1865 } 1866 1867 static int 1868 super_1_allow_new_offset(struct md_rdev *rdev, 1869 unsigned long long new_offset) 1870 { 1871 /* All necessary checks on new >= old have been done */ 1872 struct bitmap *bitmap; 1873 if (new_offset >= rdev->data_offset) 1874 return 1; 1875 1876 /* with 1.0 metadata, there is no metadata to tread on 1877 * so we can always move back */ 1878 if (rdev->mddev->minor_version == 0) 1879 return 1; 1880 1881 /* otherwise we must be sure not to step on 1882 * any metadata, so stay: 1883 * 36K beyond start of superblock 1884 * beyond end of badblocks 1885 * beyond write-intent bitmap 1886 */ 1887 if (rdev->sb_start + (32+4)*2 > new_offset) 1888 return 0; 1889 bitmap = rdev->mddev->bitmap; 1890 if (bitmap && !rdev->mddev->bitmap_info.file && 1891 rdev->sb_start + rdev->mddev->bitmap_info.offset + 1892 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) 1893 return 0; 1894 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) 1895 return 0; 1896 1897 return 1; 1898 } 1899 1900 static struct super_type super_types[] = { 1901 [0] = { 1902 .name = "0.90.0", 1903 .owner = THIS_MODULE, 1904 .load_super = super_90_load, 1905 .validate_super = super_90_validate, 1906 .sync_super = super_90_sync, 1907 .rdev_size_change = super_90_rdev_size_change, 1908 .allow_new_offset = super_90_allow_new_offset, 1909 }, 1910 [1] = { 1911 .name = "md-1", 1912 .owner = THIS_MODULE, 1913 .load_super = super_1_load, 1914 .validate_super = super_1_validate, 1915 .sync_super = super_1_sync, 1916 .rdev_size_change = super_1_rdev_size_change, 1917 .allow_new_offset = super_1_allow_new_offset, 1918 }, 1919 }; 1920 1921 static void sync_super(struct mddev *mddev, struct md_rdev *rdev) 1922 { 1923 if (mddev->sync_super) { 1924 mddev->sync_super(mddev, rdev); 1925 return; 1926 } 1927 1928 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); 1929 1930 super_types[mddev->major_version].sync_super(mddev, rdev); 1931 } 1932 1933 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) 1934 { 1935 struct md_rdev *rdev, *rdev2; 1936 1937 rcu_read_lock(); 1938 rdev_for_each_rcu(rdev, mddev1) { 1939 if (test_bit(Faulty, &rdev->flags) || 1940 test_bit(Journal, &rdev->flags) || 1941 rdev->raid_disk == -1) 1942 continue; 1943 rdev_for_each_rcu(rdev2, mddev2) { 1944 if (test_bit(Faulty, &rdev2->flags) || 1945 test_bit(Journal, &rdev2->flags) || 1946 rdev2->raid_disk == -1) 1947 continue; 1948 if (rdev->bdev->bd_contains == 1949 rdev2->bdev->bd_contains) { 1950 rcu_read_unlock(); 1951 return 1; 1952 } 1953 } 1954 } 1955 rcu_read_unlock(); 1956 return 0; 1957 } 1958 1959 static LIST_HEAD(pending_raid_disks); 1960 1961 /* 1962 * Try to register data integrity profile for an mddev 1963 * 1964 * This is called when an array is started and after a disk has been kicked 1965 * from the array. It only succeeds if all working and active component devices 1966 * are integrity capable with matching profiles. 1967 */ 1968 int md_integrity_register(struct mddev *mddev) 1969 { 1970 struct md_rdev *rdev, *reference = NULL; 1971 1972 if (list_empty(&mddev->disks)) 1973 return 0; /* nothing to do */ 1974 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) 1975 return 0; /* shouldn't register, or already is */ 1976 rdev_for_each(rdev, mddev) { 1977 /* skip spares and non-functional disks */ 1978 if (test_bit(Faulty, &rdev->flags)) 1979 continue; 1980 if (rdev->raid_disk < 0) 1981 continue; 1982 if (!reference) { 1983 /* Use the first rdev as the reference */ 1984 reference = rdev; 1985 continue; 1986 } 1987 /* does this rdev's profile match the reference profile? */ 1988 if (blk_integrity_compare(reference->bdev->bd_disk, 1989 rdev->bdev->bd_disk) < 0) 1990 return -EINVAL; 1991 } 1992 if (!reference || !bdev_get_integrity(reference->bdev)) 1993 return 0; 1994 /* 1995 * All component devices are integrity capable and have matching 1996 * profiles, register the common profile for the md device. 1997 */ 1998 blk_integrity_register(mddev->gendisk, 1999 bdev_get_integrity(reference->bdev)); 2000 2001 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); 2002 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { 2003 printk(KERN_ERR "md: failed to create integrity pool for %s\n", 2004 mdname(mddev)); 2005 return -EINVAL; 2006 } 2007 return 0; 2008 } 2009 EXPORT_SYMBOL(md_integrity_register); 2010 2011 /* 2012 * Attempt to add an rdev, but only if it is consistent with the current 2013 * integrity profile 2014 */ 2015 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) 2016 { 2017 struct blk_integrity *bi_rdev; 2018 struct blk_integrity *bi_mddev; 2019 char name[BDEVNAME_SIZE]; 2020 2021 if (!mddev->gendisk) 2022 return 0; 2023 2024 bi_rdev = bdev_get_integrity(rdev->bdev); 2025 bi_mddev = blk_get_integrity(mddev->gendisk); 2026 2027 if (!bi_mddev) /* nothing to do */ 2028 return 0; 2029 2030 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) { 2031 printk(KERN_NOTICE "%s: incompatible integrity profile for %s\n", 2032 mdname(mddev), bdevname(rdev->bdev, name)); 2033 return -ENXIO; 2034 } 2035 2036 return 0; 2037 } 2038 EXPORT_SYMBOL(md_integrity_add_rdev); 2039 2040 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) 2041 { 2042 char b[BDEVNAME_SIZE]; 2043 struct kobject *ko; 2044 int err; 2045 2046 /* prevent duplicates */ 2047 if (find_rdev(mddev, rdev->bdev->bd_dev)) 2048 return -EEXIST; 2049 2050 /* make sure rdev->sectors exceeds mddev->dev_sectors */ 2051 if (!test_bit(Journal, &rdev->flags) && 2052 rdev->sectors && 2053 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) { 2054 if (mddev->pers) { 2055 /* Cannot change size, so fail 2056 * If mddev->level <= 0, then we don't care 2057 * about aligning sizes (e.g. linear) 2058 */ 2059 if (mddev->level > 0) 2060 return -ENOSPC; 2061 } else 2062 mddev->dev_sectors = rdev->sectors; 2063 } 2064 2065 /* Verify rdev->desc_nr is unique. 2066 * If it is -1, assign a free number, else 2067 * check number is not in use 2068 */ 2069 rcu_read_lock(); 2070 if (rdev->desc_nr < 0) { 2071 int choice = 0; 2072 if (mddev->pers) 2073 choice = mddev->raid_disks; 2074 while (md_find_rdev_nr_rcu(mddev, choice)) 2075 choice++; 2076 rdev->desc_nr = choice; 2077 } else { 2078 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { 2079 rcu_read_unlock(); 2080 return -EBUSY; 2081 } 2082 } 2083 rcu_read_unlock(); 2084 if (!test_bit(Journal, &rdev->flags) && 2085 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { 2086 printk(KERN_WARNING "md: %s: array is limited to %d devices\n", 2087 mdname(mddev), mddev->max_disks); 2088 return -EBUSY; 2089 } 2090 bdevname(rdev->bdev,b); 2091 strreplace(b, '/', '!'); 2092 2093 rdev->mddev = mddev; 2094 printk(KERN_INFO "md: bind<%s>\n", b); 2095 2096 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) 2097 goto fail; 2098 2099 ko = &part_to_dev(rdev->bdev->bd_part)->kobj; 2100 if (sysfs_create_link(&rdev->kobj, ko, "block")) 2101 /* failure here is OK */; 2102 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); 2103 2104 list_add_rcu(&rdev->same_set, &mddev->disks); 2105 bd_link_disk_holder(rdev->bdev, mddev->gendisk); 2106 2107 /* May as well allow recovery to be retried once */ 2108 mddev->recovery_disabled++; 2109 2110 return 0; 2111 2112 fail: 2113 printk(KERN_WARNING "md: failed to register dev-%s for %s\n", 2114 b, mdname(mddev)); 2115 return err; 2116 } 2117 2118 static void md_delayed_delete(struct work_struct *ws) 2119 { 2120 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); 2121 kobject_del(&rdev->kobj); 2122 kobject_put(&rdev->kobj); 2123 } 2124 2125 static void unbind_rdev_from_array(struct md_rdev *rdev) 2126 { 2127 char b[BDEVNAME_SIZE]; 2128 2129 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); 2130 list_del_rcu(&rdev->same_set); 2131 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); 2132 rdev->mddev = NULL; 2133 sysfs_remove_link(&rdev->kobj, "block"); 2134 sysfs_put(rdev->sysfs_state); 2135 rdev->sysfs_state = NULL; 2136 rdev->badblocks.count = 0; 2137 /* We need to delay this, otherwise we can deadlock when 2138 * writing to 'remove' to "dev/state". We also need 2139 * to delay it due to rcu usage. 2140 */ 2141 synchronize_rcu(); 2142 INIT_WORK(&rdev->del_work, md_delayed_delete); 2143 kobject_get(&rdev->kobj); 2144 queue_work(md_misc_wq, &rdev->del_work); 2145 } 2146 2147 /* 2148 * prevent the device from being mounted, repartitioned or 2149 * otherwise reused by a RAID array (or any other kernel 2150 * subsystem), by bd_claiming the device. 2151 */ 2152 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) 2153 { 2154 int err = 0; 2155 struct block_device *bdev; 2156 char b[BDEVNAME_SIZE]; 2157 2158 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 2159 shared ? (struct md_rdev *)lock_rdev : rdev); 2160 if (IS_ERR(bdev)) { 2161 printk(KERN_ERR "md: could not open %s.\n", 2162 __bdevname(dev, b)); 2163 return PTR_ERR(bdev); 2164 } 2165 rdev->bdev = bdev; 2166 return err; 2167 } 2168 2169 static void unlock_rdev(struct md_rdev *rdev) 2170 { 2171 struct block_device *bdev = rdev->bdev; 2172 rdev->bdev = NULL; 2173 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 2174 } 2175 2176 void md_autodetect_dev(dev_t dev); 2177 2178 static void export_rdev(struct md_rdev *rdev) 2179 { 2180 char b[BDEVNAME_SIZE]; 2181 2182 printk(KERN_INFO "md: export_rdev(%s)\n", 2183 bdevname(rdev->bdev,b)); 2184 md_rdev_clear(rdev); 2185 #ifndef MODULE 2186 if (test_bit(AutoDetected, &rdev->flags)) 2187 md_autodetect_dev(rdev->bdev->bd_dev); 2188 #endif 2189 unlock_rdev(rdev); 2190 kobject_put(&rdev->kobj); 2191 } 2192 2193 void md_kick_rdev_from_array(struct md_rdev *rdev) 2194 { 2195 unbind_rdev_from_array(rdev); 2196 export_rdev(rdev); 2197 } 2198 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); 2199 2200 static void export_array(struct mddev *mddev) 2201 { 2202 struct md_rdev *rdev; 2203 2204 while (!list_empty(&mddev->disks)) { 2205 rdev = list_first_entry(&mddev->disks, struct md_rdev, 2206 same_set); 2207 md_kick_rdev_from_array(rdev); 2208 } 2209 mddev->raid_disks = 0; 2210 mddev->major_version = 0; 2211 } 2212 2213 static void sync_sbs(struct mddev *mddev, int nospares) 2214 { 2215 /* Update each superblock (in-memory image), but 2216 * if we are allowed to, skip spares which already 2217 * have the right event counter, or have one earlier 2218 * (which would mean they aren't being marked as dirty 2219 * with the rest of the array) 2220 */ 2221 struct md_rdev *rdev; 2222 rdev_for_each(rdev, mddev) { 2223 if (rdev->sb_events == mddev->events || 2224 (nospares && 2225 rdev->raid_disk < 0 && 2226 rdev->sb_events+1 == mddev->events)) { 2227 /* Don't update this superblock */ 2228 rdev->sb_loaded = 2; 2229 } else { 2230 sync_super(mddev, rdev); 2231 rdev->sb_loaded = 1; 2232 } 2233 } 2234 } 2235 2236 static bool does_sb_need_changing(struct mddev *mddev) 2237 { 2238 struct md_rdev *rdev; 2239 struct mdp_superblock_1 *sb; 2240 int role; 2241 2242 /* Find a good rdev */ 2243 rdev_for_each(rdev, mddev) 2244 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) 2245 break; 2246 2247 /* No good device found. */ 2248 if (!rdev) 2249 return false; 2250 2251 sb = page_address(rdev->sb_page); 2252 /* Check if a device has become faulty or a spare become active */ 2253 rdev_for_each(rdev, mddev) { 2254 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 2255 /* Device activated? */ 2256 if (role == 0xffff && rdev->raid_disk >=0 && 2257 !test_bit(Faulty, &rdev->flags)) 2258 return true; 2259 /* Device turned faulty? */ 2260 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) 2261 return true; 2262 } 2263 2264 /* Check if any mddev parameters have changed */ 2265 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || 2266 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || 2267 (mddev->layout != le64_to_cpu(sb->layout)) || 2268 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || 2269 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) 2270 return true; 2271 2272 return false; 2273 } 2274 2275 void md_update_sb(struct mddev *mddev, int force_change) 2276 { 2277 struct md_rdev *rdev; 2278 int sync_req; 2279 int nospares = 0; 2280 int any_badblocks_changed = 0; 2281 int ret = -1; 2282 2283 if (mddev->ro) { 2284 if (force_change) 2285 set_bit(MD_CHANGE_DEVS, &mddev->flags); 2286 return; 2287 } 2288 2289 if (mddev_is_clustered(mddev)) { 2290 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) 2291 force_change = 1; 2292 ret = md_cluster_ops->metadata_update_start(mddev); 2293 /* Has someone else has updated the sb */ 2294 if (!does_sb_need_changing(mddev)) { 2295 if (ret == 0) 2296 md_cluster_ops->metadata_update_cancel(mddev); 2297 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2298 return; 2299 } 2300 } 2301 repeat: 2302 /* First make sure individual recovery_offsets are correct */ 2303 rdev_for_each(rdev, mddev) { 2304 if (rdev->raid_disk >= 0 && 2305 mddev->delta_disks >= 0 && 2306 !test_bit(Journal, &rdev->flags) && 2307 !test_bit(In_sync, &rdev->flags) && 2308 mddev->curr_resync_completed > rdev->recovery_offset) 2309 rdev->recovery_offset = mddev->curr_resync_completed; 2310 2311 } 2312 if (!mddev->persistent) { 2313 clear_bit(MD_CHANGE_CLEAN, &mddev->flags); 2314 clear_bit(MD_CHANGE_DEVS, &mddev->flags); 2315 if (!mddev->external) { 2316 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2317 rdev_for_each(rdev, mddev) { 2318 if (rdev->badblocks.changed) { 2319 rdev->badblocks.changed = 0; 2320 ack_all_badblocks(&rdev->badblocks); 2321 md_error(mddev, rdev); 2322 } 2323 clear_bit(Blocked, &rdev->flags); 2324 clear_bit(BlockedBadBlocks, &rdev->flags); 2325 wake_up(&rdev->blocked_wait); 2326 } 2327 } 2328 wake_up(&mddev->sb_wait); 2329 return; 2330 } 2331 2332 spin_lock(&mddev->lock); 2333 2334 mddev->utime = ktime_get_real_seconds(); 2335 2336 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) 2337 force_change = 1; 2338 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) 2339 /* just a clean<-> dirty transition, possibly leave spares alone, 2340 * though if events isn't the right even/odd, we will have to do 2341 * spares after all 2342 */ 2343 nospares = 1; 2344 if (force_change) 2345 nospares = 0; 2346 if (mddev->degraded) 2347 /* If the array is degraded, then skipping spares is both 2348 * dangerous and fairly pointless. 2349 * Dangerous because a device that was removed from the array 2350 * might have a event_count that still looks up-to-date, 2351 * so it can be re-added without a resync. 2352 * Pointless because if there are any spares to skip, 2353 * then a recovery will happen and soon that array won't 2354 * be degraded any more and the spare can go back to sleep then. 2355 */ 2356 nospares = 0; 2357 2358 sync_req = mddev->in_sync; 2359 2360 /* If this is just a dirty<->clean transition, and the array is clean 2361 * and 'events' is odd, we can roll back to the previous clean state */ 2362 if (nospares 2363 && (mddev->in_sync && mddev->recovery_cp == MaxSector) 2364 && mddev->can_decrease_events 2365 && mddev->events != 1) { 2366 mddev->events--; 2367 mddev->can_decrease_events = 0; 2368 } else { 2369 /* otherwise we have to go forward and ... */ 2370 mddev->events ++; 2371 mddev->can_decrease_events = nospares; 2372 } 2373 2374 /* 2375 * This 64-bit counter should never wrap. 2376 * Either we are in around ~1 trillion A.C., assuming 2377 * 1 reboot per second, or we have a bug... 2378 */ 2379 WARN_ON(mddev->events == 0); 2380 2381 rdev_for_each(rdev, mddev) { 2382 if (rdev->badblocks.changed) 2383 any_badblocks_changed++; 2384 if (test_bit(Faulty, &rdev->flags)) 2385 set_bit(FaultRecorded, &rdev->flags); 2386 } 2387 2388 sync_sbs(mddev, nospares); 2389 spin_unlock(&mddev->lock); 2390 2391 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", 2392 mdname(mddev), mddev->in_sync); 2393 2394 bitmap_update_sb(mddev->bitmap); 2395 rdev_for_each(rdev, mddev) { 2396 char b[BDEVNAME_SIZE]; 2397 2398 if (rdev->sb_loaded != 1) 2399 continue; /* no noise on spare devices */ 2400 2401 if (!test_bit(Faulty, &rdev->flags)) { 2402 md_super_write(mddev,rdev, 2403 rdev->sb_start, rdev->sb_size, 2404 rdev->sb_page); 2405 pr_debug("md: (write) %s's sb offset: %llu\n", 2406 bdevname(rdev->bdev, b), 2407 (unsigned long long)rdev->sb_start); 2408 rdev->sb_events = mddev->events; 2409 if (rdev->badblocks.size) { 2410 md_super_write(mddev, rdev, 2411 rdev->badblocks.sector, 2412 rdev->badblocks.size << 9, 2413 rdev->bb_page); 2414 rdev->badblocks.size = 0; 2415 } 2416 2417 } else 2418 pr_debug("md: %s (skipping faulty)\n", 2419 bdevname(rdev->bdev, b)); 2420 2421 if (mddev->level == LEVEL_MULTIPATH) 2422 /* only need to write one superblock... */ 2423 break; 2424 } 2425 md_super_wait(mddev); 2426 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ 2427 2428 spin_lock(&mddev->lock); 2429 if (mddev->in_sync != sync_req || 2430 test_bit(MD_CHANGE_DEVS, &mddev->flags)) { 2431 /* have to write it out again */ 2432 spin_unlock(&mddev->lock); 2433 goto repeat; 2434 } 2435 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2436 spin_unlock(&mddev->lock); 2437 wake_up(&mddev->sb_wait); 2438 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 2439 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 2440 2441 rdev_for_each(rdev, mddev) { 2442 if (test_and_clear_bit(FaultRecorded, &rdev->flags)) 2443 clear_bit(Blocked, &rdev->flags); 2444 2445 if (any_badblocks_changed) 2446 ack_all_badblocks(&rdev->badblocks); 2447 clear_bit(BlockedBadBlocks, &rdev->flags); 2448 wake_up(&rdev->blocked_wait); 2449 } 2450 2451 if (mddev_is_clustered(mddev) && ret == 0) 2452 md_cluster_ops->metadata_update_finish(mddev); 2453 } 2454 EXPORT_SYMBOL(md_update_sb); 2455 2456 static int add_bound_rdev(struct md_rdev *rdev) 2457 { 2458 struct mddev *mddev = rdev->mddev; 2459 int err = 0; 2460 bool add_journal = test_bit(Journal, &rdev->flags); 2461 2462 if (!mddev->pers->hot_remove_disk || add_journal) { 2463 /* If there is hot_add_disk but no hot_remove_disk 2464 * then added disks for geometry changes, 2465 * and should be added immediately. 2466 */ 2467 super_types[mddev->major_version]. 2468 validate_super(mddev, rdev); 2469 if (add_journal) 2470 mddev_suspend(mddev); 2471 err = mddev->pers->hot_add_disk(mddev, rdev); 2472 if (add_journal) 2473 mddev_resume(mddev); 2474 if (err) { 2475 unbind_rdev_from_array(rdev); 2476 export_rdev(rdev); 2477 return err; 2478 } 2479 } 2480 sysfs_notify_dirent_safe(rdev->sysfs_state); 2481 2482 set_bit(MD_CHANGE_DEVS, &mddev->flags); 2483 if (mddev->degraded) 2484 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 2485 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2486 md_new_event(mddev); 2487 md_wakeup_thread(mddev->thread); 2488 return 0; 2489 } 2490 2491 /* words written to sysfs files may, or may not, be \n terminated. 2492 * We want to accept with case. For this we use cmd_match. 2493 */ 2494 static int cmd_match(const char *cmd, const char *str) 2495 { 2496 /* See if cmd, written into a sysfs file, matches 2497 * str. They must either be the same, or cmd can 2498 * have a trailing newline 2499 */ 2500 while (*cmd && *str && *cmd == *str) { 2501 cmd++; 2502 str++; 2503 } 2504 if (*cmd == '\n') 2505 cmd++; 2506 if (*str || *cmd) 2507 return 0; 2508 return 1; 2509 } 2510 2511 struct rdev_sysfs_entry { 2512 struct attribute attr; 2513 ssize_t (*show)(struct md_rdev *, char *); 2514 ssize_t (*store)(struct md_rdev *, const char *, size_t); 2515 }; 2516 2517 static ssize_t 2518 state_show(struct md_rdev *rdev, char *page) 2519 { 2520 char *sep = ""; 2521 size_t len = 0; 2522 unsigned long flags = ACCESS_ONCE(rdev->flags); 2523 2524 if (test_bit(Faulty, &flags) || 2525 rdev->badblocks.unacked_exist) { 2526 len+= sprintf(page+len, "%sfaulty",sep); 2527 sep = ","; 2528 } 2529 if (test_bit(In_sync, &flags)) { 2530 len += sprintf(page+len, "%sin_sync",sep); 2531 sep = ","; 2532 } 2533 if (test_bit(Journal, &flags)) { 2534 len += sprintf(page+len, "%sjournal",sep); 2535 sep = ","; 2536 } 2537 if (test_bit(WriteMostly, &flags)) { 2538 len += sprintf(page+len, "%swrite_mostly",sep); 2539 sep = ","; 2540 } 2541 if (test_bit(Blocked, &flags) || 2542 (rdev->badblocks.unacked_exist 2543 && !test_bit(Faulty, &flags))) { 2544 len += sprintf(page+len, "%sblocked", sep); 2545 sep = ","; 2546 } 2547 if (!test_bit(Faulty, &flags) && 2548 !test_bit(Journal, &flags) && 2549 !test_bit(In_sync, &flags)) { 2550 len += sprintf(page+len, "%sspare", sep); 2551 sep = ","; 2552 } 2553 if (test_bit(WriteErrorSeen, &flags)) { 2554 len += sprintf(page+len, "%swrite_error", sep); 2555 sep = ","; 2556 } 2557 if (test_bit(WantReplacement, &flags)) { 2558 len += sprintf(page+len, "%swant_replacement", sep); 2559 sep = ","; 2560 } 2561 if (test_bit(Replacement, &flags)) { 2562 len += sprintf(page+len, "%sreplacement", sep); 2563 sep = ","; 2564 } 2565 2566 return len+sprintf(page+len, "\n"); 2567 } 2568 2569 static ssize_t 2570 state_store(struct md_rdev *rdev, const char *buf, size_t len) 2571 { 2572 /* can write 2573 * faulty - simulates an error 2574 * remove - disconnects the device 2575 * writemostly - sets write_mostly 2576 * -writemostly - clears write_mostly 2577 * blocked - sets the Blocked flags 2578 * -blocked - clears the Blocked and possibly simulates an error 2579 * insync - sets Insync providing device isn't active 2580 * -insync - clear Insync for a device with a slot assigned, 2581 * so that it gets rebuilt based on bitmap 2582 * write_error - sets WriteErrorSeen 2583 * -write_error - clears WriteErrorSeen 2584 */ 2585 int err = -EINVAL; 2586 if (cmd_match(buf, "faulty") && rdev->mddev->pers) { 2587 md_error(rdev->mddev, rdev); 2588 if (test_bit(Faulty, &rdev->flags)) 2589 err = 0; 2590 else 2591 err = -EBUSY; 2592 } else if (cmd_match(buf, "remove")) { 2593 if (rdev->raid_disk >= 0) 2594 err = -EBUSY; 2595 else { 2596 struct mddev *mddev = rdev->mddev; 2597 err = 0; 2598 if (mddev_is_clustered(mddev)) 2599 err = md_cluster_ops->remove_disk(mddev, rdev); 2600 2601 if (err == 0) { 2602 md_kick_rdev_from_array(rdev); 2603 if (mddev->pers) 2604 md_update_sb(mddev, 1); 2605 md_new_event(mddev); 2606 } 2607 } 2608 } else if (cmd_match(buf, "writemostly")) { 2609 set_bit(WriteMostly, &rdev->flags); 2610 err = 0; 2611 } else if (cmd_match(buf, "-writemostly")) { 2612 clear_bit(WriteMostly, &rdev->flags); 2613 err = 0; 2614 } else if (cmd_match(buf, "blocked")) { 2615 set_bit(Blocked, &rdev->flags); 2616 err = 0; 2617 } else if (cmd_match(buf, "-blocked")) { 2618 if (!test_bit(Faulty, &rdev->flags) && 2619 rdev->badblocks.unacked_exist) { 2620 /* metadata handler doesn't understand badblocks, 2621 * so we need to fail the device 2622 */ 2623 md_error(rdev->mddev, rdev); 2624 } 2625 clear_bit(Blocked, &rdev->flags); 2626 clear_bit(BlockedBadBlocks, &rdev->flags); 2627 wake_up(&rdev->blocked_wait); 2628 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2629 md_wakeup_thread(rdev->mddev->thread); 2630 2631 err = 0; 2632 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { 2633 set_bit(In_sync, &rdev->flags); 2634 err = 0; 2635 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && 2636 !test_bit(Journal, &rdev->flags)) { 2637 if (rdev->mddev->pers == NULL) { 2638 clear_bit(In_sync, &rdev->flags); 2639 rdev->saved_raid_disk = rdev->raid_disk; 2640 rdev->raid_disk = -1; 2641 err = 0; 2642 } 2643 } else if (cmd_match(buf, "write_error")) { 2644 set_bit(WriteErrorSeen, &rdev->flags); 2645 err = 0; 2646 } else if (cmd_match(buf, "-write_error")) { 2647 clear_bit(WriteErrorSeen, &rdev->flags); 2648 err = 0; 2649 } else if (cmd_match(buf, "want_replacement")) { 2650 /* Any non-spare device that is not a replacement can 2651 * become want_replacement at any time, but we then need to 2652 * check if recovery is needed. 2653 */ 2654 if (rdev->raid_disk >= 0 && 2655 !test_bit(Journal, &rdev->flags) && 2656 !test_bit(Replacement, &rdev->flags)) 2657 set_bit(WantReplacement, &rdev->flags); 2658 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2659 md_wakeup_thread(rdev->mddev->thread); 2660 err = 0; 2661 } else if (cmd_match(buf, "-want_replacement")) { 2662 /* Clearing 'want_replacement' is always allowed. 2663 * Once replacements starts it is too late though. 2664 */ 2665 err = 0; 2666 clear_bit(WantReplacement, &rdev->flags); 2667 } else if (cmd_match(buf, "replacement")) { 2668 /* Can only set a device as a replacement when array has not 2669 * yet been started. Once running, replacement is automatic 2670 * from spares, or by assigning 'slot'. 2671 */ 2672 if (rdev->mddev->pers) 2673 err = -EBUSY; 2674 else { 2675 set_bit(Replacement, &rdev->flags); 2676 err = 0; 2677 } 2678 } else if (cmd_match(buf, "-replacement")) { 2679 /* Similarly, can only clear Replacement before start */ 2680 if (rdev->mddev->pers) 2681 err = -EBUSY; 2682 else { 2683 clear_bit(Replacement, &rdev->flags); 2684 err = 0; 2685 } 2686 } else if (cmd_match(buf, "re-add")) { 2687 if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) { 2688 /* clear_bit is performed _after_ all the devices 2689 * have their local Faulty bit cleared. If any writes 2690 * happen in the meantime in the local node, they 2691 * will land in the local bitmap, which will be synced 2692 * by this node eventually 2693 */ 2694 if (!mddev_is_clustered(rdev->mddev) || 2695 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { 2696 clear_bit(Faulty, &rdev->flags); 2697 err = add_bound_rdev(rdev); 2698 } 2699 } else 2700 err = -EBUSY; 2701 } 2702 if (!err) 2703 sysfs_notify_dirent_safe(rdev->sysfs_state); 2704 return err ? err : len; 2705 } 2706 static struct rdev_sysfs_entry rdev_state = 2707 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); 2708 2709 static ssize_t 2710 errors_show(struct md_rdev *rdev, char *page) 2711 { 2712 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); 2713 } 2714 2715 static ssize_t 2716 errors_store(struct md_rdev *rdev, const char *buf, size_t len) 2717 { 2718 unsigned int n; 2719 int rv; 2720 2721 rv = kstrtouint(buf, 10, &n); 2722 if (rv < 0) 2723 return rv; 2724 atomic_set(&rdev->corrected_errors, n); 2725 return len; 2726 } 2727 static struct rdev_sysfs_entry rdev_errors = 2728 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); 2729 2730 static ssize_t 2731 slot_show(struct md_rdev *rdev, char *page) 2732 { 2733 if (test_bit(Journal, &rdev->flags)) 2734 return sprintf(page, "journal\n"); 2735 else if (rdev->raid_disk < 0) 2736 return sprintf(page, "none\n"); 2737 else 2738 return sprintf(page, "%d\n", rdev->raid_disk); 2739 } 2740 2741 static ssize_t 2742 slot_store(struct md_rdev *rdev, const char *buf, size_t len) 2743 { 2744 int slot; 2745 int err; 2746 2747 if (test_bit(Journal, &rdev->flags)) 2748 return -EBUSY; 2749 if (strncmp(buf, "none", 4)==0) 2750 slot = -1; 2751 else { 2752 err = kstrtouint(buf, 10, (unsigned int *)&slot); 2753 if (err < 0) 2754 return err; 2755 } 2756 if (rdev->mddev->pers && slot == -1) { 2757 /* Setting 'slot' on an active array requires also 2758 * updating the 'rd%d' link, and communicating 2759 * with the personality with ->hot_*_disk. 2760 * For now we only support removing 2761 * failed/spare devices. This normally happens automatically, 2762 * but not when the metadata is externally managed. 2763 */ 2764 if (rdev->raid_disk == -1) 2765 return -EEXIST; 2766 /* personality does all needed checks */ 2767 if (rdev->mddev->pers->hot_remove_disk == NULL) 2768 return -EINVAL; 2769 clear_bit(Blocked, &rdev->flags); 2770 remove_and_add_spares(rdev->mddev, rdev); 2771 if (rdev->raid_disk >= 0) 2772 return -EBUSY; 2773 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2774 md_wakeup_thread(rdev->mddev->thread); 2775 } else if (rdev->mddev->pers) { 2776 /* Activating a spare .. or possibly reactivating 2777 * if we ever get bitmaps working here. 2778 */ 2779 int err; 2780 2781 if (rdev->raid_disk != -1) 2782 return -EBUSY; 2783 2784 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) 2785 return -EBUSY; 2786 2787 if (rdev->mddev->pers->hot_add_disk == NULL) 2788 return -EINVAL; 2789 2790 if (slot >= rdev->mddev->raid_disks && 2791 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 2792 return -ENOSPC; 2793 2794 rdev->raid_disk = slot; 2795 if (test_bit(In_sync, &rdev->flags)) 2796 rdev->saved_raid_disk = slot; 2797 else 2798 rdev->saved_raid_disk = -1; 2799 clear_bit(In_sync, &rdev->flags); 2800 clear_bit(Bitmap_sync, &rdev->flags); 2801 err = rdev->mddev->pers-> 2802 hot_add_disk(rdev->mddev, rdev); 2803 if (err) { 2804 rdev->raid_disk = -1; 2805 return err; 2806 } else 2807 sysfs_notify_dirent_safe(rdev->sysfs_state); 2808 if (sysfs_link_rdev(rdev->mddev, rdev)) 2809 /* failure here is OK */; 2810 /* don't wakeup anyone, leave that to userspace. */ 2811 } else { 2812 if (slot >= rdev->mddev->raid_disks && 2813 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 2814 return -ENOSPC; 2815 rdev->raid_disk = slot; 2816 /* assume it is working */ 2817 clear_bit(Faulty, &rdev->flags); 2818 clear_bit(WriteMostly, &rdev->flags); 2819 set_bit(In_sync, &rdev->flags); 2820 sysfs_notify_dirent_safe(rdev->sysfs_state); 2821 } 2822 return len; 2823 } 2824 2825 static struct rdev_sysfs_entry rdev_slot = 2826 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); 2827 2828 static ssize_t 2829 offset_show(struct md_rdev *rdev, char *page) 2830 { 2831 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); 2832 } 2833 2834 static ssize_t 2835 offset_store(struct md_rdev *rdev, const char *buf, size_t len) 2836 { 2837 unsigned long long offset; 2838 if (kstrtoull(buf, 10, &offset) < 0) 2839 return -EINVAL; 2840 if (rdev->mddev->pers && rdev->raid_disk >= 0) 2841 return -EBUSY; 2842 if (rdev->sectors && rdev->mddev->external) 2843 /* Must set offset before size, so overlap checks 2844 * can be sane */ 2845 return -EBUSY; 2846 rdev->data_offset = offset; 2847 rdev->new_data_offset = offset; 2848 return len; 2849 } 2850 2851 static struct rdev_sysfs_entry rdev_offset = 2852 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); 2853 2854 static ssize_t new_offset_show(struct md_rdev *rdev, char *page) 2855 { 2856 return sprintf(page, "%llu\n", 2857 (unsigned long long)rdev->new_data_offset); 2858 } 2859 2860 static ssize_t new_offset_store(struct md_rdev *rdev, 2861 const char *buf, size_t len) 2862 { 2863 unsigned long long new_offset; 2864 struct mddev *mddev = rdev->mddev; 2865 2866 if (kstrtoull(buf, 10, &new_offset) < 0) 2867 return -EINVAL; 2868 2869 if (mddev->sync_thread || 2870 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) 2871 return -EBUSY; 2872 if (new_offset == rdev->data_offset) 2873 /* reset is always permitted */ 2874 ; 2875 else if (new_offset > rdev->data_offset) { 2876 /* must not push array size beyond rdev_sectors */ 2877 if (new_offset - rdev->data_offset 2878 + mddev->dev_sectors > rdev->sectors) 2879 return -E2BIG; 2880 } 2881 /* Metadata worries about other space details. */ 2882 2883 /* decreasing the offset is inconsistent with a backwards 2884 * reshape. 2885 */ 2886 if (new_offset < rdev->data_offset && 2887 mddev->reshape_backwards) 2888 return -EINVAL; 2889 /* Increasing offset is inconsistent with forwards 2890 * reshape. reshape_direction should be set to 2891 * 'backwards' first. 2892 */ 2893 if (new_offset > rdev->data_offset && 2894 !mddev->reshape_backwards) 2895 return -EINVAL; 2896 2897 if (mddev->pers && mddev->persistent && 2898 !super_types[mddev->major_version] 2899 .allow_new_offset(rdev, new_offset)) 2900 return -E2BIG; 2901 rdev->new_data_offset = new_offset; 2902 if (new_offset > rdev->data_offset) 2903 mddev->reshape_backwards = 1; 2904 else if (new_offset < rdev->data_offset) 2905 mddev->reshape_backwards = 0; 2906 2907 return len; 2908 } 2909 static struct rdev_sysfs_entry rdev_new_offset = 2910 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); 2911 2912 static ssize_t 2913 rdev_size_show(struct md_rdev *rdev, char *page) 2914 { 2915 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); 2916 } 2917 2918 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) 2919 { 2920 /* check if two start/length pairs overlap */ 2921 if (s1+l1 <= s2) 2922 return 0; 2923 if (s2+l2 <= s1) 2924 return 0; 2925 return 1; 2926 } 2927 2928 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) 2929 { 2930 unsigned long long blocks; 2931 sector_t new; 2932 2933 if (kstrtoull(buf, 10, &blocks) < 0) 2934 return -EINVAL; 2935 2936 if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) 2937 return -EINVAL; /* sector conversion overflow */ 2938 2939 new = blocks * 2; 2940 if (new != blocks * 2) 2941 return -EINVAL; /* unsigned long long to sector_t overflow */ 2942 2943 *sectors = new; 2944 return 0; 2945 } 2946 2947 static ssize_t 2948 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) 2949 { 2950 struct mddev *my_mddev = rdev->mddev; 2951 sector_t oldsectors = rdev->sectors; 2952 sector_t sectors; 2953 2954 if (test_bit(Journal, &rdev->flags)) 2955 return -EBUSY; 2956 if (strict_blocks_to_sectors(buf, §ors) < 0) 2957 return -EINVAL; 2958 if (rdev->data_offset != rdev->new_data_offset) 2959 return -EINVAL; /* too confusing */ 2960 if (my_mddev->pers && rdev->raid_disk >= 0) { 2961 if (my_mddev->persistent) { 2962 sectors = super_types[my_mddev->major_version]. 2963 rdev_size_change(rdev, sectors); 2964 if (!sectors) 2965 return -EBUSY; 2966 } else if (!sectors) 2967 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - 2968 rdev->data_offset; 2969 if (!my_mddev->pers->resize) 2970 /* Cannot change size for RAID0 or Linear etc */ 2971 return -EINVAL; 2972 } 2973 if (sectors < my_mddev->dev_sectors) 2974 return -EINVAL; /* component must fit device */ 2975 2976 rdev->sectors = sectors; 2977 if (sectors > oldsectors && my_mddev->external) { 2978 /* Need to check that all other rdevs with the same 2979 * ->bdev do not overlap. 'rcu' is sufficient to walk 2980 * the rdev lists safely. 2981 * This check does not provide a hard guarantee, it 2982 * just helps avoid dangerous mistakes. 2983 */ 2984 struct mddev *mddev; 2985 int overlap = 0; 2986 struct list_head *tmp; 2987 2988 rcu_read_lock(); 2989 for_each_mddev(mddev, tmp) { 2990 struct md_rdev *rdev2; 2991 2992 rdev_for_each(rdev2, mddev) 2993 if (rdev->bdev == rdev2->bdev && 2994 rdev != rdev2 && 2995 overlaps(rdev->data_offset, rdev->sectors, 2996 rdev2->data_offset, 2997 rdev2->sectors)) { 2998 overlap = 1; 2999 break; 3000 } 3001 if (overlap) { 3002 mddev_put(mddev); 3003 break; 3004 } 3005 } 3006 rcu_read_unlock(); 3007 if (overlap) { 3008 /* Someone else could have slipped in a size 3009 * change here, but doing so is just silly. 3010 * We put oldsectors back because we *know* it is 3011 * safe, and trust userspace not to race with 3012 * itself 3013 */ 3014 rdev->sectors = oldsectors; 3015 return -EBUSY; 3016 } 3017 } 3018 return len; 3019 } 3020 3021 static struct rdev_sysfs_entry rdev_size = 3022 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); 3023 3024 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) 3025 { 3026 unsigned long long recovery_start = rdev->recovery_offset; 3027 3028 if (test_bit(In_sync, &rdev->flags) || 3029 recovery_start == MaxSector) 3030 return sprintf(page, "none\n"); 3031 3032 return sprintf(page, "%llu\n", recovery_start); 3033 } 3034 3035 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) 3036 { 3037 unsigned long long recovery_start; 3038 3039 if (cmd_match(buf, "none")) 3040 recovery_start = MaxSector; 3041 else if (kstrtoull(buf, 10, &recovery_start)) 3042 return -EINVAL; 3043 3044 if (rdev->mddev->pers && 3045 rdev->raid_disk >= 0) 3046 return -EBUSY; 3047 3048 rdev->recovery_offset = recovery_start; 3049 if (recovery_start == MaxSector) 3050 set_bit(In_sync, &rdev->flags); 3051 else 3052 clear_bit(In_sync, &rdev->flags); 3053 return len; 3054 } 3055 3056 static struct rdev_sysfs_entry rdev_recovery_start = 3057 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); 3058 3059 /* sysfs access to bad-blocks list. 3060 * We present two files. 3061 * 'bad-blocks' lists sector numbers and lengths of ranges that 3062 * are recorded as bad. The list is truncated to fit within 3063 * the one-page limit of sysfs. 3064 * Writing "sector length" to this file adds an acknowledged 3065 * bad block list. 3066 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet 3067 * been acknowledged. Writing to this file adds bad blocks 3068 * without acknowledging them. This is largely for testing. 3069 */ 3070 static ssize_t bb_show(struct md_rdev *rdev, char *page) 3071 { 3072 return badblocks_show(&rdev->badblocks, page, 0); 3073 } 3074 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) 3075 { 3076 int rv = badblocks_store(&rdev->badblocks, page, len, 0); 3077 /* Maybe that ack was all we needed */ 3078 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) 3079 wake_up(&rdev->blocked_wait); 3080 return rv; 3081 } 3082 static struct rdev_sysfs_entry rdev_bad_blocks = 3083 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); 3084 3085 static ssize_t ubb_show(struct md_rdev *rdev, char *page) 3086 { 3087 return badblocks_show(&rdev->badblocks, page, 1); 3088 } 3089 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) 3090 { 3091 return badblocks_store(&rdev->badblocks, page, len, 1); 3092 } 3093 static struct rdev_sysfs_entry rdev_unack_bad_blocks = 3094 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); 3095 3096 static struct attribute *rdev_default_attrs[] = { 3097 &rdev_state.attr, 3098 &rdev_errors.attr, 3099 &rdev_slot.attr, 3100 &rdev_offset.attr, 3101 &rdev_new_offset.attr, 3102 &rdev_size.attr, 3103 &rdev_recovery_start.attr, 3104 &rdev_bad_blocks.attr, 3105 &rdev_unack_bad_blocks.attr, 3106 NULL, 3107 }; 3108 static ssize_t 3109 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 3110 { 3111 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 3112 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 3113 3114 if (!entry->show) 3115 return -EIO; 3116 if (!rdev->mddev) 3117 return -EBUSY; 3118 return entry->show(rdev, page); 3119 } 3120 3121 static ssize_t 3122 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 3123 const char *page, size_t length) 3124 { 3125 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 3126 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 3127 ssize_t rv; 3128 struct mddev *mddev = rdev->mddev; 3129 3130 if (!entry->store) 3131 return -EIO; 3132 if (!capable(CAP_SYS_ADMIN)) 3133 return -EACCES; 3134 rv = mddev ? mddev_lock(mddev): -EBUSY; 3135 if (!rv) { 3136 if (rdev->mddev == NULL) 3137 rv = -EBUSY; 3138 else 3139 rv = entry->store(rdev, page, length); 3140 mddev_unlock(mddev); 3141 } 3142 return rv; 3143 } 3144 3145 static void rdev_free(struct kobject *ko) 3146 { 3147 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); 3148 kfree(rdev); 3149 } 3150 static const struct sysfs_ops rdev_sysfs_ops = { 3151 .show = rdev_attr_show, 3152 .store = rdev_attr_store, 3153 }; 3154 static struct kobj_type rdev_ktype = { 3155 .release = rdev_free, 3156 .sysfs_ops = &rdev_sysfs_ops, 3157 .default_attrs = rdev_default_attrs, 3158 }; 3159 3160 int md_rdev_init(struct md_rdev *rdev) 3161 { 3162 rdev->desc_nr = -1; 3163 rdev->saved_raid_disk = -1; 3164 rdev->raid_disk = -1; 3165 rdev->flags = 0; 3166 rdev->data_offset = 0; 3167 rdev->new_data_offset = 0; 3168 rdev->sb_events = 0; 3169 rdev->last_read_error.tv_sec = 0; 3170 rdev->last_read_error.tv_nsec = 0; 3171 rdev->sb_loaded = 0; 3172 rdev->bb_page = NULL; 3173 atomic_set(&rdev->nr_pending, 0); 3174 atomic_set(&rdev->read_errors, 0); 3175 atomic_set(&rdev->corrected_errors, 0); 3176 3177 INIT_LIST_HEAD(&rdev->same_set); 3178 init_waitqueue_head(&rdev->blocked_wait); 3179 3180 /* Add space to store bad block list. 3181 * This reserves the space even on arrays where it cannot 3182 * be used - I wonder if that matters 3183 */ 3184 return badblocks_init(&rdev->badblocks, 0); 3185 } 3186 EXPORT_SYMBOL_GPL(md_rdev_init); 3187 /* 3188 * Import a device. If 'super_format' >= 0, then sanity check the superblock 3189 * 3190 * mark the device faulty if: 3191 * 3192 * - the device is nonexistent (zero size) 3193 * - the device has no valid superblock 3194 * 3195 * a faulty rdev _never_ has rdev->sb set. 3196 */ 3197 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) 3198 { 3199 char b[BDEVNAME_SIZE]; 3200 int err; 3201 struct md_rdev *rdev; 3202 sector_t size; 3203 3204 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); 3205 if (!rdev) { 3206 printk(KERN_ERR "md: could not alloc mem for new device!\n"); 3207 return ERR_PTR(-ENOMEM); 3208 } 3209 3210 err = md_rdev_init(rdev); 3211 if (err) 3212 goto abort_free; 3213 err = alloc_disk_sb(rdev); 3214 if (err) 3215 goto abort_free; 3216 3217 err = lock_rdev(rdev, newdev, super_format == -2); 3218 if (err) 3219 goto abort_free; 3220 3221 kobject_init(&rdev->kobj, &rdev_ktype); 3222 3223 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; 3224 if (!size) { 3225 printk(KERN_WARNING 3226 "md: %s has zero or unknown size, marking faulty!\n", 3227 bdevname(rdev->bdev,b)); 3228 err = -EINVAL; 3229 goto abort_free; 3230 } 3231 3232 if (super_format >= 0) { 3233 err = super_types[super_format]. 3234 load_super(rdev, NULL, super_minor); 3235 if (err == -EINVAL) { 3236 printk(KERN_WARNING 3237 "md: %s does not have a valid v%d.%d " 3238 "superblock, not importing!\n", 3239 bdevname(rdev->bdev,b), 3240 super_format, super_minor); 3241 goto abort_free; 3242 } 3243 if (err < 0) { 3244 printk(KERN_WARNING 3245 "md: could not read %s's sb, not importing!\n", 3246 bdevname(rdev->bdev,b)); 3247 goto abort_free; 3248 } 3249 } 3250 3251 return rdev; 3252 3253 abort_free: 3254 if (rdev->bdev) 3255 unlock_rdev(rdev); 3256 md_rdev_clear(rdev); 3257 kfree(rdev); 3258 return ERR_PTR(err); 3259 } 3260 3261 /* 3262 * Check a full RAID array for plausibility 3263 */ 3264 3265 static void analyze_sbs(struct mddev *mddev) 3266 { 3267 int i; 3268 struct md_rdev *rdev, *freshest, *tmp; 3269 char b[BDEVNAME_SIZE]; 3270 3271 freshest = NULL; 3272 rdev_for_each_safe(rdev, tmp, mddev) 3273 switch (super_types[mddev->major_version]. 3274 load_super(rdev, freshest, mddev->minor_version)) { 3275 case 1: 3276 freshest = rdev; 3277 break; 3278 case 0: 3279 break; 3280 default: 3281 printk( KERN_ERR \ 3282 "md: fatal superblock inconsistency in %s" 3283 " -- removing from array\n", 3284 bdevname(rdev->bdev,b)); 3285 md_kick_rdev_from_array(rdev); 3286 } 3287 3288 super_types[mddev->major_version]. 3289 validate_super(mddev, freshest); 3290 3291 i = 0; 3292 rdev_for_each_safe(rdev, tmp, mddev) { 3293 if (mddev->max_disks && 3294 (rdev->desc_nr >= mddev->max_disks || 3295 i > mddev->max_disks)) { 3296 printk(KERN_WARNING 3297 "md: %s: %s: only %d devices permitted\n", 3298 mdname(mddev), bdevname(rdev->bdev, b), 3299 mddev->max_disks); 3300 md_kick_rdev_from_array(rdev); 3301 continue; 3302 } 3303 if (rdev != freshest) { 3304 if (super_types[mddev->major_version]. 3305 validate_super(mddev, rdev)) { 3306 printk(KERN_WARNING "md: kicking non-fresh %s" 3307 " from array!\n", 3308 bdevname(rdev->bdev,b)); 3309 md_kick_rdev_from_array(rdev); 3310 continue; 3311 } 3312 } 3313 if (mddev->level == LEVEL_MULTIPATH) { 3314 rdev->desc_nr = i++; 3315 rdev->raid_disk = rdev->desc_nr; 3316 set_bit(In_sync, &rdev->flags); 3317 } else if (rdev->raid_disk >= 3318 (mddev->raid_disks - min(0, mddev->delta_disks)) && 3319 !test_bit(Journal, &rdev->flags)) { 3320 rdev->raid_disk = -1; 3321 clear_bit(In_sync, &rdev->flags); 3322 } 3323 } 3324 } 3325 3326 /* Read a fixed-point number. 3327 * Numbers in sysfs attributes should be in "standard" units where 3328 * possible, so time should be in seconds. 3329 * However we internally use a a much smaller unit such as 3330 * milliseconds or jiffies. 3331 * This function takes a decimal number with a possible fractional 3332 * component, and produces an integer which is the result of 3333 * multiplying that number by 10^'scale'. 3334 * all without any floating-point arithmetic. 3335 */ 3336 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) 3337 { 3338 unsigned long result = 0; 3339 long decimals = -1; 3340 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { 3341 if (*cp == '.') 3342 decimals = 0; 3343 else if (decimals < scale) { 3344 unsigned int value; 3345 value = *cp - '0'; 3346 result = result * 10 + value; 3347 if (decimals >= 0) 3348 decimals++; 3349 } 3350 cp++; 3351 } 3352 if (*cp == '\n') 3353 cp++; 3354 if (*cp) 3355 return -EINVAL; 3356 if (decimals < 0) 3357 decimals = 0; 3358 while (decimals < scale) { 3359 result *= 10; 3360 decimals ++; 3361 } 3362 *res = result; 3363 return 0; 3364 } 3365 3366 static ssize_t 3367 safe_delay_show(struct mddev *mddev, char *page) 3368 { 3369 int msec = (mddev->safemode_delay*1000)/HZ; 3370 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); 3371 } 3372 static ssize_t 3373 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) 3374 { 3375 unsigned long msec; 3376 3377 if (mddev_is_clustered(mddev)) { 3378 pr_info("md: Safemode is disabled for clustered mode\n"); 3379 return -EINVAL; 3380 } 3381 3382 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) 3383 return -EINVAL; 3384 if (msec == 0) 3385 mddev->safemode_delay = 0; 3386 else { 3387 unsigned long old_delay = mddev->safemode_delay; 3388 unsigned long new_delay = (msec*HZ)/1000; 3389 3390 if (new_delay == 0) 3391 new_delay = 1; 3392 mddev->safemode_delay = new_delay; 3393 if (new_delay < old_delay || old_delay == 0) 3394 mod_timer(&mddev->safemode_timer, jiffies+1); 3395 } 3396 return len; 3397 } 3398 static struct md_sysfs_entry md_safe_delay = 3399 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); 3400 3401 static ssize_t 3402 level_show(struct mddev *mddev, char *page) 3403 { 3404 struct md_personality *p; 3405 int ret; 3406 spin_lock(&mddev->lock); 3407 p = mddev->pers; 3408 if (p) 3409 ret = sprintf(page, "%s\n", p->name); 3410 else if (mddev->clevel[0]) 3411 ret = sprintf(page, "%s\n", mddev->clevel); 3412 else if (mddev->level != LEVEL_NONE) 3413 ret = sprintf(page, "%d\n", mddev->level); 3414 else 3415 ret = 0; 3416 spin_unlock(&mddev->lock); 3417 return ret; 3418 } 3419 3420 static ssize_t 3421 level_store(struct mddev *mddev, const char *buf, size_t len) 3422 { 3423 char clevel[16]; 3424 ssize_t rv; 3425 size_t slen = len; 3426 struct md_personality *pers, *oldpers; 3427 long level; 3428 void *priv, *oldpriv; 3429 struct md_rdev *rdev; 3430 3431 if (slen == 0 || slen >= sizeof(clevel)) 3432 return -EINVAL; 3433 3434 rv = mddev_lock(mddev); 3435 if (rv) 3436 return rv; 3437 3438 if (mddev->pers == NULL) { 3439 strncpy(mddev->clevel, buf, slen); 3440 if (mddev->clevel[slen-1] == '\n') 3441 slen--; 3442 mddev->clevel[slen] = 0; 3443 mddev->level = LEVEL_NONE; 3444 rv = len; 3445 goto out_unlock; 3446 } 3447 rv = -EROFS; 3448 if (mddev->ro) 3449 goto out_unlock; 3450 3451 /* request to change the personality. Need to ensure: 3452 * - array is not engaged in resync/recovery/reshape 3453 * - old personality can be suspended 3454 * - new personality will access other array. 3455 */ 3456 3457 rv = -EBUSY; 3458 if (mddev->sync_thread || 3459 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 3460 mddev->reshape_position != MaxSector || 3461 mddev->sysfs_active) 3462 goto out_unlock; 3463 3464 rv = -EINVAL; 3465 if (!mddev->pers->quiesce) { 3466 printk(KERN_WARNING "md: %s: %s does not support online personality change\n", 3467 mdname(mddev), mddev->pers->name); 3468 goto out_unlock; 3469 } 3470 3471 /* Now find the new personality */ 3472 strncpy(clevel, buf, slen); 3473 if (clevel[slen-1] == '\n') 3474 slen--; 3475 clevel[slen] = 0; 3476 if (kstrtol(clevel, 10, &level)) 3477 level = LEVEL_NONE; 3478 3479 if (request_module("md-%s", clevel) != 0) 3480 request_module("md-level-%s", clevel); 3481 spin_lock(&pers_lock); 3482 pers = find_pers(level, clevel); 3483 if (!pers || !try_module_get(pers->owner)) { 3484 spin_unlock(&pers_lock); 3485 printk(KERN_WARNING "md: personality %s not loaded\n", clevel); 3486 rv = -EINVAL; 3487 goto out_unlock; 3488 } 3489 spin_unlock(&pers_lock); 3490 3491 if (pers == mddev->pers) { 3492 /* Nothing to do! */ 3493 module_put(pers->owner); 3494 rv = len; 3495 goto out_unlock; 3496 } 3497 if (!pers->takeover) { 3498 module_put(pers->owner); 3499 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", 3500 mdname(mddev), clevel); 3501 rv = -EINVAL; 3502 goto out_unlock; 3503 } 3504 3505 rdev_for_each(rdev, mddev) 3506 rdev->new_raid_disk = rdev->raid_disk; 3507 3508 /* ->takeover must set new_* and/or delta_disks 3509 * if it succeeds, and may set them when it fails. 3510 */ 3511 priv = pers->takeover(mddev); 3512 if (IS_ERR(priv)) { 3513 mddev->new_level = mddev->level; 3514 mddev->new_layout = mddev->layout; 3515 mddev->new_chunk_sectors = mddev->chunk_sectors; 3516 mddev->raid_disks -= mddev->delta_disks; 3517 mddev->delta_disks = 0; 3518 mddev->reshape_backwards = 0; 3519 module_put(pers->owner); 3520 printk(KERN_WARNING "md: %s: %s would not accept array\n", 3521 mdname(mddev), clevel); 3522 rv = PTR_ERR(priv); 3523 goto out_unlock; 3524 } 3525 3526 /* Looks like we have a winner */ 3527 mddev_suspend(mddev); 3528 mddev_detach(mddev); 3529 3530 spin_lock(&mddev->lock); 3531 oldpers = mddev->pers; 3532 oldpriv = mddev->private; 3533 mddev->pers = pers; 3534 mddev->private = priv; 3535 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 3536 mddev->level = mddev->new_level; 3537 mddev->layout = mddev->new_layout; 3538 mddev->chunk_sectors = mddev->new_chunk_sectors; 3539 mddev->delta_disks = 0; 3540 mddev->reshape_backwards = 0; 3541 mddev->degraded = 0; 3542 spin_unlock(&mddev->lock); 3543 3544 if (oldpers->sync_request == NULL && 3545 mddev->external) { 3546 /* We are converting from a no-redundancy array 3547 * to a redundancy array and metadata is managed 3548 * externally so we need to be sure that writes 3549 * won't block due to a need to transition 3550 * clean->dirty 3551 * until external management is started. 3552 */ 3553 mddev->in_sync = 0; 3554 mddev->safemode_delay = 0; 3555 mddev->safemode = 0; 3556 } 3557 3558 oldpers->free(mddev, oldpriv); 3559 3560 if (oldpers->sync_request == NULL && 3561 pers->sync_request != NULL) { 3562 /* need to add the md_redundancy_group */ 3563 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 3564 printk(KERN_WARNING 3565 "md: cannot register extra attributes for %s\n", 3566 mdname(mddev)); 3567 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); 3568 } 3569 if (oldpers->sync_request != NULL && 3570 pers->sync_request == NULL) { 3571 /* need to remove the md_redundancy_group */ 3572 if (mddev->to_remove == NULL) 3573 mddev->to_remove = &md_redundancy_group; 3574 } 3575 3576 rdev_for_each(rdev, mddev) { 3577 if (rdev->raid_disk < 0) 3578 continue; 3579 if (rdev->new_raid_disk >= mddev->raid_disks) 3580 rdev->new_raid_disk = -1; 3581 if (rdev->new_raid_disk == rdev->raid_disk) 3582 continue; 3583 sysfs_unlink_rdev(mddev, rdev); 3584 } 3585 rdev_for_each(rdev, mddev) { 3586 if (rdev->raid_disk < 0) 3587 continue; 3588 if (rdev->new_raid_disk == rdev->raid_disk) 3589 continue; 3590 rdev->raid_disk = rdev->new_raid_disk; 3591 if (rdev->raid_disk < 0) 3592 clear_bit(In_sync, &rdev->flags); 3593 else { 3594 if (sysfs_link_rdev(mddev, rdev)) 3595 printk(KERN_WARNING "md: cannot register rd%d" 3596 " for %s after level change\n", 3597 rdev->raid_disk, mdname(mddev)); 3598 } 3599 } 3600 3601 if (pers->sync_request == NULL) { 3602 /* this is now an array without redundancy, so 3603 * it must always be in_sync 3604 */ 3605 mddev->in_sync = 1; 3606 del_timer_sync(&mddev->safemode_timer); 3607 } 3608 blk_set_stacking_limits(&mddev->queue->limits); 3609 pers->run(mddev); 3610 set_bit(MD_CHANGE_DEVS, &mddev->flags); 3611 mddev_resume(mddev); 3612 if (!mddev->thread) 3613 md_update_sb(mddev, 1); 3614 sysfs_notify(&mddev->kobj, NULL, "level"); 3615 md_new_event(mddev); 3616 rv = len; 3617 out_unlock: 3618 mddev_unlock(mddev); 3619 return rv; 3620 } 3621 3622 static struct md_sysfs_entry md_level = 3623 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); 3624 3625 static ssize_t 3626 layout_show(struct mddev *mddev, char *page) 3627 { 3628 /* just a number, not meaningful for all levels */ 3629 if (mddev->reshape_position != MaxSector && 3630 mddev->layout != mddev->new_layout) 3631 return sprintf(page, "%d (%d)\n", 3632 mddev->new_layout, mddev->layout); 3633 return sprintf(page, "%d\n", mddev->layout); 3634 } 3635 3636 static ssize_t 3637 layout_store(struct mddev *mddev, const char *buf, size_t len) 3638 { 3639 unsigned int n; 3640 int err; 3641 3642 err = kstrtouint(buf, 10, &n); 3643 if (err < 0) 3644 return err; 3645 err = mddev_lock(mddev); 3646 if (err) 3647 return err; 3648 3649 if (mddev->pers) { 3650 if (mddev->pers->check_reshape == NULL) 3651 err = -EBUSY; 3652 else if (mddev->ro) 3653 err = -EROFS; 3654 else { 3655 mddev->new_layout = n; 3656 err = mddev->pers->check_reshape(mddev); 3657 if (err) 3658 mddev->new_layout = mddev->layout; 3659 } 3660 } else { 3661 mddev->new_layout = n; 3662 if (mddev->reshape_position == MaxSector) 3663 mddev->layout = n; 3664 } 3665 mddev_unlock(mddev); 3666 return err ?: len; 3667 } 3668 static struct md_sysfs_entry md_layout = 3669 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); 3670 3671 static ssize_t 3672 raid_disks_show(struct mddev *mddev, char *page) 3673 { 3674 if (mddev->raid_disks == 0) 3675 return 0; 3676 if (mddev->reshape_position != MaxSector && 3677 mddev->delta_disks != 0) 3678 return sprintf(page, "%d (%d)\n", mddev->raid_disks, 3679 mddev->raid_disks - mddev->delta_disks); 3680 return sprintf(page, "%d\n", mddev->raid_disks); 3681 } 3682 3683 static int update_raid_disks(struct mddev *mddev, int raid_disks); 3684 3685 static ssize_t 3686 raid_disks_store(struct mddev *mddev, const char *buf, size_t len) 3687 { 3688 unsigned int n; 3689 int err; 3690 3691 err = kstrtouint(buf, 10, &n); 3692 if (err < 0) 3693 return err; 3694 3695 err = mddev_lock(mddev); 3696 if (err) 3697 return err; 3698 if (mddev->pers) 3699 err = update_raid_disks(mddev, n); 3700 else if (mddev->reshape_position != MaxSector) { 3701 struct md_rdev *rdev; 3702 int olddisks = mddev->raid_disks - mddev->delta_disks; 3703 3704 err = -EINVAL; 3705 rdev_for_each(rdev, mddev) { 3706 if (olddisks < n && 3707 rdev->data_offset < rdev->new_data_offset) 3708 goto out_unlock; 3709 if (olddisks > n && 3710 rdev->data_offset > rdev->new_data_offset) 3711 goto out_unlock; 3712 } 3713 err = 0; 3714 mddev->delta_disks = n - olddisks; 3715 mddev->raid_disks = n; 3716 mddev->reshape_backwards = (mddev->delta_disks < 0); 3717 } else 3718 mddev->raid_disks = n; 3719 out_unlock: 3720 mddev_unlock(mddev); 3721 return err ? err : len; 3722 } 3723 static struct md_sysfs_entry md_raid_disks = 3724 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); 3725 3726 static ssize_t 3727 chunk_size_show(struct mddev *mddev, char *page) 3728 { 3729 if (mddev->reshape_position != MaxSector && 3730 mddev->chunk_sectors != mddev->new_chunk_sectors) 3731 return sprintf(page, "%d (%d)\n", 3732 mddev->new_chunk_sectors << 9, 3733 mddev->chunk_sectors << 9); 3734 return sprintf(page, "%d\n", mddev->chunk_sectors << 9); 3735 } 3736 3737 static ssize_t 3738 chunk_size_store(struct mddev *mddev, const char *buf, size_t len) 3739 { 3740 unsigned long n; 3741 int err; 3742 3743 err = kstrtoul(buf, 10, &n); 3744 if (err < 0) 3745 return err; 3746 3747 err = mddev_lock(mddev); 3748 if (err) 3749 return err; 3750 if (mddev->pers) { 3751 if (mddev->pers->check_reshape == NULL) 3752 err = -EBUSY; 3753 else if (mddev->ro) 3754 err = -EROFS; 3755 else { 3756 mddev->new_chunk_sectors = n >> 9; 3757 err = mddev->pers->check_reshape(mddev); 3758 if (err) 3759 mddev->new_chunk_sectors = mddev->chunk_sectors; 3760 } 3761 } else { 3762 mddev->new_chunk_sectors = n >> 9; 3763 if (mddev->reshape_position == MaxSector) 3764 mddev->chunk_sectors = n >> 9; 3765 } 3766 mddev_unlock(mddev); 3767 return err ?: len; 3768 } 3769 static struct md_sysfs_entry md_chunk_size = 3770 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); 3771 3772 static ssize_t 3773 resync_start_show(struct mddev *mddev, char *page) 3774 { 3775 if (mddev->recovery_cp == MaxSector) 3776 return sprintf(page, "none\n"); 3777 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); 3778 } 3779 3780 static ssize_t 3781 resync_start_store(struct mddev *mddev, const char *buf, size_t len) 3782 { 3783 unsigned long long n; 3784 int err; 3785 3786 if (cmd_match(buf, "none")) 3787 n = MaxSector; 3788 else { 3789 err = kstrtoull(buf, 10, &n); 3790 if (err < 0) 3791 return err; 3792 if (n != (sector_t)n) 3793 return -EINVAL; 3794 } 3795 3796 err = mddev_lock(mddev); 3797 if (err) 3798 return err; 3799 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 3800 err = -EBUSY; 3801 3802 if (!err) { 3803 mddev->recovery_cp = n; 3804 if (mddev->pers) 3805 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 3806 } 3807 mddev_unlock(mddev); 3808 return err ?: len; 3809 } 3810 static struct md_sysfs_entry md_resync_start = 3811 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, 3812 resync_start_show, resync_start_store); 3813 3814 /* 3815 * The array state can be: 3816 * 3817 * clear 3818 * No devices, no size, no level 3819 * Equivalent to STOP_ARRAY ioctl 3820 * inactive 3821 * May have some settings, but array is not active 3822 * all IO results in error 3823 * When written, doesn't tear down array, but just stops it 3824 * suspended (not supported yet) 3825 * All IO requests will block. The array can be reconfigured. 3826 * Writing this, if accepted, will block until array is quiescent 3827 * readonly 3828 * no resync can happen. no superblocks get written. 3829 * write requests fail 3830 * read-auto 3831 * like readonly, but behaves like 'clean' on a write request. 3832 * 3833 * clean - no pending writes, but otherwise active. 3834 * When written to inactive array, starts without resync 3835 * If a write request arrives then 3836 * if metadata is known, mark 'dirty' and switch to 'active'. 3837 * if not known, block and switch to write-pending 3838 * If written to an active array that has pending writes, then fails. 3839 * active 3840 * fully active: IO and resync can be happening. 3841 * When written to inactive array, starts with resync 3842 * 3843 * write-pending 3844 * clean, but writes are blocked waiting for 'active' to be written. 3845 * 3846 * active-idle 3847 * like active, but no writes have been seen for a while (100msec). 3848 * 3849 */ 3850 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, 3851 write_pending, active_idle, bad_word}; 3852 static char *array_states[] = { 3853 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", 3854 "write-pending", "active-idle", NULL }; 3855 3856 static int match_word(const char *word, char **list) 3857 { 3858 int n; 3859 for (n=0; list[n]; n++) 3860 if (cmd_match(word, list[n])) 3861 break; 3862 return n; 3863 } 3864 3865 static ssize_t 3866 array_state_show(struct mddev *mddev, char *page) 3867 { 3868 enum array_state st = inactive; 3869 3870 if (mddev->pers) 3871 switch(mddev->ro) { 3872 case 1: 3873 st = readonly; 3874 break; 3875 case 2: 3876 st = read_auto; 3877 break; 3878 case 0: 3879 if (mddev->in_sync) 3880 st = clean; 3881 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) 3882 st = write_pending; 3883 else if (mddev->safemode) 3884 st = active_idle; 3885 else 3886 st = active; 3887 } 3888 else { 3889 if (list_empty(&mddev->disks) && 3890 mddev->raid_disks == 0 && 3891 mddev->dev_sectors == 0) 3892 st = clear; 3893 else 3894 st = inactive; 3895 } 3896 return sprintf(page, "%s\n", array_states[st]); 3897 } 3898 3899 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); 3900 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); 3901 static int do_md_run(struct mddev *mddev); 3902 static int restart_array(struct mddev *mddev); 3903 3904 static ssize_t 3905 array_state_store(struct mddev *mddev, const char *buf, size_t len) 3906 { 3907 int err; 3908 enum array_state st = match_word(buf, array_states); 3909 3910 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { 3911 /* don't take reconfig_mutex when toggling between 3912 * clean and active 3913 */ 3914 spin_lock(&mddev->lock); 3915 if (st == active) { 3916 restart_array(mddev); 3917 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 3918 wake_up(&mddev->sb_wait); 3919 err = 0; 3920 } else /* st == clean */ { 3921 restart_array(mddev); 3922 if (atomic_read(&mddev->writes_pending) == 0) { 3923 if (mddev->in_sync == 0) { 3924 mddev->in_sync = 1; 3925 if (mddev->safemode == 1) 3926 mddev->safemode = 0; 3927 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 3928 } 3929 err = 0; 3930 } else 3931 err = -EBUSY; 3932 } 3933 spin_unlock(&mddev->lock); 3934 return err ?: len; 3935 } 3936 err = mddev_lock(mddev); 3937 if (err) 3938 return err; 3939 err = -EINVAL; 3940 switch(st) { 3941 case bad_word: 3942 break; 3943 case clear: 3944 /* stopping an active array */ 3945 err = do_md_stop(mddev, 0, NULL); 3946 break; 3947 case inactive: 3948 /* stopping an active array */ 3949 if (mddev->pers) 3950 err = do_md_stop(mddev, 2, NULL); 3951 else 3952 err = 0; /* already inactive */ 3953 break; 3954 case suspended: 3955 break; /* not supported yet */ 3956 case readonly: 3957 if (mddev->pers) 3958 err = md_set_readonly(mddev, NULL); 3959 else { 3960 mddev->ro = 1; 3961 set_disk_ro(mddev->gendisk, 1); 3962 err = do_md_run(mddev); 3963 } 3964 break; 3965 case read_auto: 3966 if (mddev->pers) { 3967 if (mddev->ro == 0) 3968 err = md_set_readonly(mddev, NULL); 3969 else if (mddev->ro == 1) 3970 err = restart_array(mddev); 3971 if (err == 0) { 3972 mddev->ro = 2; 3973 set_disk_ro(mddev->gendisk, 0); 3974 } 3975 } else { 3976 mddev->ro = 2; 3977 err = do_md_run(mddev); 3978 } 3979 break; 3980 case clean: 3981 if (mddev->pers) { 3982 err = restart_array(mddev); 3983 if (err) 3984 break; 3985 spin_lock(&mddev->lock); 3986 if (atomic_read(&mddev->writes_pending) == 0) { 3987 if (mddev->in_sync == 0) { 3988 mddev->in_sync = 1; 3989 if (mddev->safemode == 1) 3990 mddev->safemode = 0; 3991 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 3992 } 3993 err = 0; 3994 } else 3995 err = -EBUSY; 3996 spin_unlock(&mddev->lock); 3997 } else 3998 err = -EINVAL; 3999 break; 4000 case active: 4001 if (mddev->pers) { 4002 err = restart_array(mddev); 4003 if (err) 4004 break; 4005 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 4006 wake_up(&mddev->sb_wait); 4007 err = 0; 4008 } else { 4009 mddev->ro = 0; 4010 set_disk_ro(mddev->gendisk, 0); 4011 err = do_md_run(mddev); 4012 } 4013 break; 4014 case write_pending: 4015 case active_idle: 4016 /* these cannot be set */ 4017 break; 4018 } 4019 4020 if (!err) { 4021 if (mddev->hold_active == UNTIL_IOCTL) 4022 mddev->hold_active = 0; 4023 sysfs_notify_dirent_safe(mddev->sysfs_state); 4024 } 4025 mddev_unlock(mddev); 4026 return err ?: len; 4027 } 4028 static struct md_sysfs_entry md_array_state = 4029 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); 4030 4031 static ssize_t 4032 max_corrected_read_errors_show(struct mddev *mddev, char *page) { 4033 return sprintf(page, "%d\n", 4034 atomic_read(&mddev->max_corr_read_errors)); 4035 } 4036 4037 static ssize_t 4038 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) 4039 { 4040 unsigned int n; 4041 int rv; 4042 4043 rv = kstrtouint(buf, 10, &n); 4044 if (rv < 0) 4045 return rv; 4046 atomic_set(&mddev->max_corr_read_errors, n); 4047 return len; 4048 } 4049 4050 static struct md_sysfs_entry max_corr_read_errors = 4051 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, 4052 max_corrected_read_errors_store); 4053 4054 static ssize_t 4055 null_show(struct mddev *mddev, char *page) 4056 { 4057 return -EINVAL; 4058 } 4059 4060 static ssize_t 4061 new_dev_store(struct mddev *mddev, const char *buf, size_t len) 4062 { 4063 /* buf must be %d:%d\n? giving major and minor numbers */ 4064 /* The new device is added to the array. 4065 * If the array has a persistent superblock, we read the 4066 * superblock to initialise info and check validity. 4067 * Otherwise, only checking done is that in bind_rdev_to_array, 4068 * which mainly checks size. 4069 */ 4070 char *e; 4071 int major = simple_strtoul(buf, &e, 10); 4072 int minor; 4073 dev_t dev; 4074 struct md_rdev *rdev; 4075 int err; 4076 4077 if (!*buf || *e != ':' || !e[1] || e[1] == '\n') 4078 return -EINVAL; 4079 minor = simple_strtoul(e+1, &e, 10); 4080 if (*e && *e != '\n') 4081 return -EINVAL; 4082 dev = MKDEV(major, minor); 4083 if (major != MAJOR(dev) || 4084 minor != MINOR(dev)) 4085 return -EOVERFLOW; 4086 4087 flush_workqueue(md_misc_wq); 4088 4089 err = mddev_lock(mddev); 4090 if (err) 4091 return err; 4092 if (mddev->persistent) { 4093 rdev = md_import_device(dev, mddev->major_version, 4094 mddev->minor_version); 4095 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { 4096 struct md_rdev *rdev0 4097 = list_entry(mddev->disks.next, 4098 struct md_rdev, same_set); 4099 err = super_types[mddev->major_version] 4100 .load_super(rdev, rdev0, mddev->minor_version); 4101 if (err < 0) 4102 goto out; 4103 } 4104 } else if (mddev->external) 4105 rdev = md_import_device(dev, -2, -1); 4106 else 4107 rdev = md_import_device(dev, -1, -1); 4108 4109 if (IS_ERR(rdev)) { 4110 mddev_unlock(mddev); 4111 return PTR_ERR(rdev); 4112 } 4113 err = bind_rdev_to_array(rdev, mddev); 4114 out: 4115 if (err) 4116 export_rdev(rdev); 4117 mddev_unlock(mddev); 4118 return err ? err : len; 4119 } 4120 4121 static struct md_sysfs_entry md_new_device = 4122 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); 4123 4124 static ssize_t 4125 bitmap_store(struct mddev *mddev, const char *buf, size_t len) 4126 { 4127 char *end; 4128 unsigned long chunk, end_chunk; 4129 int err; 4130 4131 err = mddev_lock(mddev); 4132 if (err) 4133 return err; 4134 if (!mddev->bitmap) 4135 goto out; 4136 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ 4137 while (*buf) { 4138 chunk = end_chunk = simple_strtoul(buf, &end, 0); 4139 if (buf == end) break; 4140 if (*end == '-') { /* range */ 4141 buf = end + 1; 4142 end_chunk = simple_strtoul(buf, &end, 0); 4143 if (buf == end) break; 4144 } 4145 if (*end && !isspace(*end)) break; 4146 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); 4147 buf = skip_spaces(end); 4148 } 4149 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ 4150 out: 4151 mddev_unlock(mddev); 4152 return len; 4153 } 4154 4155 static struct md_sysfs_entry md_bitmap = 4156 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); 4157 4158 static ssize_t 4159 size_show(struct mddev *mddev, char *page) 4160 { 4161 return sprintf(page, "%llu\n", 4162 (unsigned long long)mddev->dev_sectors / 2); 4163 } 4164 4165 static int update_size(struct mddev *mddev, sector_t num_sectors); 4166 4167 static ssize_t 4168 size_store(struct mddev *mddev, const char *buf, size_t len) 4169 { 4170 /* If array is inactive, we can reduce the component size, but 4171 * not increase it (except from 0). 4172 * If array is active, we can try an on-line resize 4173 */ 4174 sector_t sectors; 4175 int err = strict_blocks_to_sectors(buf, §ors); 4176 4177 if (err < 0) 4178 return err; 4179 err = mddev_lock(mddev); 4180 if (err) 4181 return err; 4182 if (mddev->pers) { 4183 err = update_size(mddev, sectors); 4184 md_update_sb(mddev, 1); 4185 } else { 4186 if (mddev->dev_sectors == 0 || 4187 mddev->dev_sectors > sectors) 4188 mddev->dev_sectors = sectors; 4189 else 4190 err = -ENOSPC; 4191 } 4192 mddev_unlock(mddev); 4193 return err ? err : len; 4194 } 4195 4196 static struct md_sysfs_entry md_size = 4197 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); 4198 4199 /* Metadata version. 4200 * This is one of 4201 * 'none' for arrays with no metadata (good luck...) 4202 * 'external' for arrays with externally managed metadata, 4203 * or N.M for internally known formats 4204 */ 4205 static ssize_t 4206 metadata_show(struct mddev *mddev, char *page) 4207 { 4208 if (mddev->persistent) 4209 return sprintf(page, "%d.%d\n", 4210 mddev->major_version, mddev->minor_version); 4211 else if (mddev->external) 4212 return sprintf(page, "external:%s\n", mddev->metadata_type); 4213 else 4214 return sprintf(page, "none\n"); 4215 } 4216 4217 static ssize_t 4218 metadata_store(struct mddev *mddev, const char *buf, size_t len) 4219 { 4220 int major, minor; 4221 char *e; 4222 int err; 4223 /* Changing the details of 'external' metadata is 4224 * always permitted. Otherwise there must be 4225 * no devices attached to the array. 4226 */ 4227 4228 err = mddev_lock(mddev); 4229 if (err) 4230 return err; 4231 err = -EBUSY; 4232 if (mddev->external && strncmp(buf, "external:", 9) == 0) 4233 ; 4234 else if (!list_empty(&mddev->disks)) 4235 goto out_unlock; 4236 4237 err = 0; 4238 if (cmd_match(buf, "none")) { 4239 mddev->persistent = 0; 4240 mddev->external = 0; 4241 mddev->major_version = 0; 4242 mddev->minor_version = 90; 4243 goto out_unlock; 4244 } 4245 if (strncmp(buf, "external:", 9) == 0) { 4246 size_t namelen = len-9; 4247 if (namelen >= sizeof(mddev->metadata_type)) 4248 namelen = sizeof(mddev->metadata_type)-1; 4249 strncpy(mddev->metadata_type, buf+9, namelen); 4250 mddev->metadata_type[namelen] = 0; 4251 if (namelen && mddev->metadata_type[namelen-1] == '\n') 4252 mddev->metadata_type[--namelen] = 0; 4253 mddev->persistent = 0; 4254 mddev->external = 1; 4255 mddev->major_version = 0; 4256 mddev->minor_version = 90; 4257 goto out_unlock; 4258 } 4259 major = simple_strtoul(buf, &e, 10); 4260 err = -EINVAL; 4261 if (e==buf || *e != '.') 4262 goto out_unlock; 4263 buf = e+1; 4264 minor = simple_strtoul(buf, &e, 10); 4265 if (e==buf || (*e && *e != '\n') ) 4266 goto out_unlock; 4267 err = -ENOENT; 4268 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) 4269 goto out_unlock; 4270 mddev->major_version = major; 4271 mddev->minor_version = minor; 4272 mddev->persistent = 1; 4273 mddev->external = 0; 4274 err = 0; 4275 out_unlock: 4276 mddev_unlock(mddev); 4277 return err ?: len; 4278 } 4279 4280 static struct md_sysfs_entry md_metadata = 4281 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); 4282 4283 static ssize_t 4284 action_show(struct mddev *mddev, char *page) 4285 { 4286 char *type = "idle"; 4287 unsigned long recovery = mddev->recovery; 4288 if (test_bit(MD_RECOVERY_FROZEN, &recovery)) 4289 type = "frozen"; 4290 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || 4291 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { 4292 if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) 4293 type = "reshape"; 4294 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { 4295 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) 4296 type = "resync"; 4297 else if (test_bit(MD_RECOVERY_CHECK, &recovery)) 4298 type = "check"; 4299 else 4300 type = "repair"; 4301 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) 4302 type = "recover"; 4303 else if (mddev->reshape_position != MaxSector) 4304 type = "reshape"; 4305 } 4306 return sprintf(page, "%s\n", type); 4307 } 4308 4309 static ssize_t 4310 action_store(struct mddev *mddev, const char *page, size_t len) 4311 { 4312 if (!mddev->pers || !mddev->pers->sync_request) 4313 return -EINVAL; 4314 4315 4316 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { 4317 if (cmd_match(page, "frozen")) 4318 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4319 else 4320 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4321 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 4322 mddev_lock(mddev) == 0) { 4323 flush_workqueue(md_misc_wq); 4324 if (mddev->sync_thread) { 4325 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4326 md_reap_sync_thread(mddev); 4327 } 4328 mddev_unlock(mddev); 4329 } 4330 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4331 return -EBUSY; 4332 else if (cmd_match(page, "resync")) 4333 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4334 else if (cmd_match(page, "recover")) { 4335 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4336 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 4337 } else if (cmd_match(page, "reshape")) { 4338 int err; 4339 if (mddev->pers->start_reshape == NULL) 4340 return -EINVAL; 4341 err = mddev_lock(mddev); 4342 if (!err) { 4343 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4344 err = -EBUSY; 4345 else { 4346 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4347 err = mddev->pers->start_reshape(mddev); 4348 } 4349 mddev_unlock(mddev); 4350 } 4351 if (err) 4352 return err; 4353 sysfs_notify(&mddev->kobj, NULL, "degraded"); 4354 } else { 4355 if (cmd_match(page, "check")) 4356 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4357 else if (!cmd_match(page, "repair")) 4358 return -EINVAL; 4359 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4360 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 4361 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4362 } 4363 if (mddev->ro == 2) { 4364 /* A write to sync_action is enough to justify 4365 * canceling read-auto mode 4366 */ 4367 mddev->ro = 0; 4368 md_wakeup_thread(mddev->sync_thread); 4369 } 4370 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4371 md_wakeup_thread(mddev->thread); 4372 sysfs_notify_dirent_safe(mddev->sysfs_action); 4373 return len; 4374 } 4375 4376 static struct md_sysfs_entry md_scan_mode = 4377 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 4378 4379 static ssize_t 4380 last_sync_action_show(struct mddev *mddev, char *page) 4381 { 4382 return sprintf(page, "%s\n", mddev->last_sync_action); 4383 } 4384 4385 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); 4386 4387 static ssize_t 4388 mismatch_cnt_show(struct mddev *mddev, char *page) 4389 { 4390 return sprintf(page, "%llu\n", 4391 (unsigned long long) 4392 atomic64_read(&mddev->resync_mismatches)); 4393 } 4394 4395 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); 4396 4397 static ssize_t 4398 sync_min_show(struct mddev *mddev, char *page) 4399 { 4400 return sprintf(page, "%d (%s)\n", speed_min(mddev), 4401 mddev->sync_speed_min ? "local": "system"); 4402 } 4403 4404 static ssize_t 4405 sync_min_store(struct mddev *mddev, const char *buf, size_t len) 4406 { 4407 unsigned int min; 4408 int rv; 4409 4410 if (strncmp(buf, "system", 6)==0) { 4411 min = 0; 4412 } else { 4413 rv = kstrtouint(buf, 10, &min); 4414 if (rv < 0) 4415 return rv; 4416 if (min == 0) 4417 return -EINVAL; 4418 } 4419 mddev->sync_speed_min = min; 4420 return len; 4421 } 4422 4423 static struct md_sysfs_entry md_sync_min = 4424 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); 4425 4426 static ssize_t 4427 sync_max_show(struct mddev *mddev, char *page) 4428 { 4429 return sprintf(page, "%d (%s)\n", speed_max(mddev), 4430 mddev->sync_speed_max ? "local": "system"); 4431 } 4432 4433 static ssize_t 4434 sync_max_store(struct mddev *mddev, const char *buf, size_t len) 4435 { 4436 unsigned int max; 4437 int rv; 4438 4439 if (strncmp(buf, "system", 6)==0) { 4440 max = 0; 4441 } else { 4442 rv = kstrtouint(buf, 10, &max); 4443 if (rv < 0) 4444 return rv; 4445 if (max == 0) 4446 return -EINVAL; 4447 } 4448 mddev->sync_speed_max = max; 4449 return len; 4450 } 4451 4452 static struct md_sysfs_entry md_sync_max = 4453 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); 4454 4455 static ssize_t 4456 degraded_show(struct mddev *mddev, char *page) 4457 { 4458 return sprintf(page, "%d\n", mddev->degraded); 4459 } 4460 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); 4461 4462 static ssize_t 4463 sync_force_parallel_show(struct mddev *mddev, char *page) 4464 { 4465 return sprintf(page, "%d\n", mddev->parallel_resync); 4466 } 4467 4468 static ssize_t 4469 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) 4470 { 4471 long n; 4472 4473 if (kstrtol(buf, 10, &n)) 4474 return -EINVAL; 4475 4476 if (n != 0 && n != 1) 4477 return -EINVAL; 4478 4479 mddev->parallel_resync = n; 4480 4481 if (mddev->sync_thread) 4482 wake_up(&resync_wait); 4483 4484 return len; 4485 } 4486 4487 /* force parallel resync, even with shared block devices */ 4488 static struct md_sysfs_entry md_sync_force_parallel = 4489 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, 4490 sync_force_parallel_show, sync_force_parallel_store); 4491 4492 static ssize_t 4493 sync_speed_show(struct mddev *mddev, char *page) 4494 { 4495 unsigned long resync, dt, db; 4496 if (mddev->curr_resync == 0) 4497 return sprintf(page, "none\n"); 4498 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); 4499 dt = (jiffies - mddev->resync_mark) / HZ; 4500 if (!dt) dt++; 4501 db = resync - mddev->resync_mark_cnt; 4502 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ 4503 } 4504 4505 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); 4506 4507 static ssize_t 4508 sync_completed_show(struct mddev *mddev, char *page) 4509 { 4510 unsigned long long max_sectors, resync; 4511 4512 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4513 return sprintf(page, "none\n"); 4514 4515 if (mddev->curr_resync == 1 || 4516 mddev->curr_resync == 2) 4517 return sprintf(page, "delayed\n"); 4518 4519 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 4520 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 4521 max_sectors = mddev->resync_max_sectors; 4522 else 4523 max_sectors = mddev->dev_sectors; 4524 4525 resync = mddev->curr_resync_completed; 4526 return sprintf(page, "%llu / %llu\n", resync, max_sectors); 4527 } 4528 4529 static struct md_sysfs_entry md_sync_completed = 4530 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); 4531 4532 static ssize_t 4533 min_sync_show(struct mddev *mddev, char *page) 4534 { 4535 return sprintf(page, "%llu\n", 4536 (unsigned long long)mddev->resync_min); 4537 } 4538 static ssize_t 4539 min_sync_store(struct mddev *mddev, const char *buf, size_t len) 4540 { 4541 unsigned long long min; 4542 int err; 4543 4544 if (kstrtoull(buf, 10, &min)) 4545 return -EINVAL; 4546 4547 spin_lock(&mddev->lock); 4548 err = -EINVAL; 4549 if (min > mddev->resync_max) 4550 goto out_unlock; 4551 4552 err = -EBUSY; 4553 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4554 goto out_unlock; 4555 4556 /* Round down to multiple of 4K for safety */ 4557 mddev->resync_min = round_down(min, 8); 4558 err = 0; 4559 4560 out_unlock: 4561 spin_unlock(&mddev->lock); 4562 return err ?: len; 4563 } 4564 4565 static struct md_sysfs_entry md_min_sync = 4566 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); 4567 4568 static ssize_t 4569 max_sync_show(struct mddev *mddev, char *page) 4570 { 4571 if (mddev->resync_max == MaxSector) 4572 return sprintf(page, "max\n"); 4573 else 4574 return sprintf(page, "%llu\n", 4575 (unsigned long long)mddev->resync_max); 4576 } 4577 static ssize_t 4578 max_sync_store(struct mddev *mddev, const char *buf, size_t len) 4579 { 4580 int err; 4581 spin_lock(&mddev->lock); 4582 if (strncmp(buf, "max", 3) == 0) 4583 mddev->resync_max = MaxSector; 4584 else { 4585 unsigned long long max; 4586 int chunk; 4587 4588 err = -EINVAL; 4589 if (kstrtoull(buf, 10, &max)) 4590 goto out_unlock; 4591 if (max < mddev->resync_min) 4592 goto out_unlock; 4593 4594 err = -EBUSY; 4595 if (max < mddev->resync_max && 4596 mddev->ro == 0 && 4597 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4598 goto out_unlock; 4599 4600 /* Must be a multiple of chunk_size */ 4601 chunk = mddev->chunk_sectors; 4602 if (chunk) { 4603 sector_t temp = max; 4604 4605 err = -EINVAL; 4606 if (sector_div(temp, chunk)) 4607 goto out_unlock; 4608 } 4609 mddev->resync_max = max; 4610 } 4611 wake_up(&mddev->recovery_wait); 4612 err = 0; 4613 out_unlock: 4614 spin_unlock(&mddev->lock); 4615 return err ?: len; 4616 } 4617 4618 static struct md_sysfs_entry md_max_sync = 4619 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); 4620 4621 static ssize_t 4622 suspend_lo_show(struct mddev *mddev, char *page) 4623 { 4624 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); 4625 } 4626 4627 static ssize_t 4628 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) 4629 { 4630 unsigned long long old, new; 4631 int err; 4632 4633 err = kstrtoull(buf, 10, &new); 4634 if (err < 0) 4635 return err; 4636 if (new != (sector_t)new) 4637 return -EINVAL; 4638 4639 err = mddev_lock(mddev); 4640 if (err) 4641 return err; 4642 err = -EINVAL; 4643 if (mddev->pers == NULL || 4644 mddev->pers->quiesce == NULL) 4645 goto unlock; 4646 old = mddev->suspend_lo; 4647 mddev->suspend_lo = new; 4648 if (new >= old) 4649 /* Shrinking suspended region */ 4650 mddev->pers->quiesce(mddev, 2); 4651 else { 4652 /* Expanding suspended region - need to wait */ 4653 mddev->pers->quiesce(mddev, 1); 4654 mddev->pers->quiesce(mddev, 0); 4655 } 4656 err = 0; 4657 unlock: 4658 mddev_unlock(mddev); 4659 return err ?: len; 4660 } 4661 static struct md_sysfs_entry md_suspend_lo = 4662 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); 4663 4664 static ssize_t 4665 suspend_hi_show(struct mddev *mddev, char *page) 4666 { 4667 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); 4668 } 4669 4670 static ssize_t 4671 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) 4672 { 4673 unsigned long long old, new; 4674 int err; 4675 4676 err = kstrtoull(buf, 10, &new); 4677 if (err < 0) 4678 return err; 4679 if (new != (sector_t)new) 4680 return -EINVAL; 4681 4682 err = mddev_lock(mddev); 4683 if (err) 4684 return err; 4685 err = -EINVAL; 4686 if (mddev->pers == NULL || 4687 mddev->pers->quiesce == NULL) 4688 goto unlock; 4689 old = mddev->suspend_hi; 4690 mddev->suspend_hi = new; 4691 if (new <= old) 4692 /* Shrinking suspended region */ 4693 mddev->pers->quiesce(mddev, 2); 4694 else { 4695 /* Expanding suspended region - need to wait */ 4696 mddev->pers->quiesce(mddev, 1); 4697 mddev->pers->quiesce(mddev, 0); 4698 } 4699 err = 0; 4700 unlock: 4701 mddev_unlock(mddev); 4702 return err ?: len; 4703 } 4704 static struct md_sysfs_entry md_suspend_hi = 4705 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); 4706 4707 static ssize_t 4708 reshape_position_show(struct mddev *mddev, char *page) 4709 { 4710 if (mddev->reshape_position != MaxSector) 4711 return sprintf(page, "%llu\n", 4712 (unsigned long long)mddev->reshape_position); 4713 strcpy(page, "none\n"); 4714 return 5; 4715 } 4716 4717 static ssize_t 4718 reshape_position_store(struct mddev *mddev, const char *buf, size_t len) 4719 { 4720 struct md_rdev *rdev; 4721 unsigned long long new; 4722 int err; 4723 4724 err = kstrtoull(buf, 10, &new); 4725 if (err < 0) 4726 return err; 4727 if (new != (sector_t)new) 4728 return -EINVAL; 4729 err = mddev_lock(mddev); 4730 if (err) 4731 return err; 4732 err = -EBUSY; 4733 if (mddev->pers) 4734 goto unlock; 4735 mddev->reshape_position = new; 4736 mddev->delta_disks = 0; 4737 mddev->reshape_backwards = 0; 4738 mddev->new_level = mddev->level; 4739 mddev->new_layout = mddev->layout; 4740 mddev->new_chunk_sectors = mddev->chunk_sectors; 4741 rdev_for_each(rdev, mddev) 4742 rdev->new_data_offset = rdev->data_offset; 4743 err = 0; 4744 unlock: 4745 mddev_unlock(mddev); 4746 return err ?: len; 4747 } 4748 4749 static struct md_sysfs_entry md_reshape_position = 4750 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, 4751 reshape_position_store); 4752 4753 static ssize_t 4754 reshape_direction_show(struct mddev *mddev, char *page) 4755 { 4756 return sprintf(page, "%s\n", 4757 mddev->reshape_backwards ? "backwards" : "forwards"); 4758 } 4759 4760 static ssize_t 4761 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) 4762 { 4763 int backwards = 0; 4764 int err; 4765 4766 if (cmd_match(buf, "forwards")) 4767 backwards = 0; 4768 else if (cmd_match(buf, "backwards")) 4769 backwards = 1; 4770 else 4771 return -EINVAL; 4772 if (mddev->reshape_backwards == backwards) 4773 return len; 4774 4775 err = mddev_lock(mddev); 4776 if (err) 4777 return err; 4778 /* check if we are allowed to change */ 4779 if (mddev->delta_disks) 4780 err = -EBUSY; 4781 else if (mddev->persistent && 4782 mddev->major_version == 0) 4783 err = -EINVAL; 4784 else 4785 mddev->reshape_backwards = backwards; 4786 mddev_unlock(mddev); 4787 return err ?: len; 4788 } 4789 4790 static struct md_sysfs_entry md_reshape_direction = 4791 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, 4792 reshape_direction_store); 4793 4794 static ssize_t 4795 array_size_show(struct mddev *mddev, char *page) 4796 { 4797 if (mddev->external_size) 4798 return sprintf(page, "%llu\n", 4799 (unsigned long long)mddev->array_sectors/2); 4800 else 4801 return sprintf(page, "default\n"); 4802 } 4803 4804 static ssize_t 4805 array_size_store(struct mddev *mddev, const char *buf, size_t len) 4806 { 4807 sector_t sectors; 4808 int err; 4809 4810 err = mddev_lock(mddev); 4811 if (err) 4812 return err; 4813 4814 if (strncmp(buf, "default", 7) == 0) { 4815 if (mddev->pers) 4816 sectors = mddev->pers->size(mddev, 0, 0); 4817 else 4818 sectors = mddev->array_sectors; 4819 4820 mddev->external_size = 0; 4821 } else { 4822 if (strict_blocks_to_sectors(buf, §ors) < 0) 4823 err = -EINVAL; 4824 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) 4825 err = -E2BIG; 4826 else 4827 mddev->external_size = 1; 4828 } 4829 4830 if (!err) { 4831 mddev->array_sectors = sectors; 4832 if (mddev->pers) { 4833 set_capacity(mddev->gendisk, mddev->array_sectors); 4834 revalidate_disk(mddev->gendisk); 4835 } 4836 } 4837 mddev_unlock(mddev); 4838 return err ?: len; 4839 } 4840 4841 static struct md_sysfs_entry md_array_size = 4842 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, 4843 array_size_store); 4844 4845 static struct attribute *md_default_attrs[] = { 4846 &md_level.attr, 4847 &md_layout.attr, 4848 &md_raid_disks.attr, 4849 &md_chunk_size.attr, 4850 &md_size.attr, 4851 &md_resync_start.attr, 4852 &md_metadata.attr, 4853 &md_new_device.attr, 4854 &md_safe_delay.attr, 4855 &md_array_state.attr, 4856 &md_reshape_position.attr, 4857 &md_reshape_direction.attr, 4858 &md_array_size.attr, 4859 &max_corr_read_errors.attr, 4860 NULL, 4861 }; 4862 4863 static struct attribute *md_redundancy_attrs[] = { 4864 &md_scan_mode.attr, 4865 &md_last_scan_mode.attr, 4866 &md_mismatches.attr, 4867 &md_sync_min.attr, 4868 &md_sync_max.attr, 4869 &md_sync_speed.attr, 4870 &md_sync_force_parallel.attr, 4871 &md_sync_completed.attr, 4872 &md_min_sync.attr, 4873 &md_max_sync.attr, 4874 &md_suspend_lo.attr, 4875 &md_suspend_hi.attr, 4876 &md_bitmap.attr, 4877 &md_degraded.attr, 4878 NULL, 4879 }; 4880 static struct attribute_group md_redundancy_group = { 4881 .name = NULL, 4882 .attrs = md_redundancy_attrs, 4883 }; 4884 4885 static ssize_t 4886 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 4887 { 4888 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 4889 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 4890 ssize_t rv; 4891 4892 if (!entry->show) 4893 return -EIO; 4894 spin_lock(&all_mddevs_lock); 4895 if (list_empty(&mddev->all_mddevs)) { 4896 spin_unlock(&all_mddevs_lock); 4897 return -EBUSY; 4898 } 4899 mddev_get(mddev); 4900 spin_unlock(&all_mddevs_lock); 4901 4902 rv = entry->show(mddev, page); 4903 mddev_put(mddev); 4904 return rv; 4905 } 4906 4907 static ssize_t 4908 md_attr_store(struct kobject *kobj, struct attribute *attr, 4909 const char *page, size_t length) 4910 { 4911 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 4912 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 4913 ssize_t rv; 4914 4915 if (!entry->store) 4916 return -EIO; 4917 if (!capable(CAP_SYS_ADMIN)) 4918 return -EACCES; 4919 spin_lock(&all_mddevs_lock); 4920 if (list_empty(&mddev->all_mddevs)) { 4921 spin_unlock(&all_mddevs_lock); 4922 return -EBUSY; 4923 } 4924 mddev_get(mddev); 4925 spin_unlock(&all_mddevs_lock); 4926 rv = entry->store(mddev, page, length); 4927 mddev_put(mddev); 4928 return rv; 4929 } 4930 4931 static void md_free(struct kobject *ko) 4932 { 4933 struct mddev *mddev = container_of(ko, struct mddev, kobj); 4934 4935 if (mddev->sysfs_state) 4936 sysfs_put(mddev->sysfs_state); 4937 4938 if (mddev->queue) 4939 blk_cleanup_queue(mddev->queue); 4940 if (mddev->gendisk) { 4941 del_gendisk(mddev->gendisk); 4942 put_disk(mddev->gendisk); 4943 } 4944 4945 kfree(mddev); 4946 } 4947 4948 static const struct sysfs_ops md_sysfs_ops = { 4949 .show = md_attr_show, 4950 .store = md_attr_store, 4951 }; 4952 static struct kobj_type md_ktype = { 4953 .release = md_free, 4954 .sysfs_ops = &md_sysfs_ops, 4955 .default_attrs = md_default_attrs, 4956 }; 4957 4958 int mdp_major = 0; 4959 4960 static void mddev_delayed_delete(struct work_struct *ws) 4961 { 4962 struct mddev *mddev = container_of(ws, struct mddev, del_work); 4963 4964 sysfs_remove_group(&mddev->kobj, &md_bitmap_group); 4965 kobject_del(&mddev->kobj); 4966 kobject_put(&mddev->kobj); 4967 } 4968 4969 static int md_alloc(dev_t dev, char *name) 4970 { 4971 static DEFINE_MUTEX(disks_mutex); 4972 struct mddev *mddev = mddev_find(dev); 4973 struct gendisk *disk; 4974 int partitioned; 4975 int shift; 4976 int unit; 4977 int error; 4978 4979 if (!mddev) 4980 return -ENODEV; 4981 4982 partitioned = (MAJOR(mddev->unit) != MD_MAJOR); 4983 shift = partitioned ? MdpMinorShift : 0; 4984 unit = MINOR(mddev->unit) >> shift; 4985 4986 /* wait for any previous instance of this device to be 4987 * completely removed (mddev_delayed_delete). 4988 */ 4989 flush_workqueue(md_misc_wq); 4990 4991 mutex_lock(&disks_mutex); 4992 error = -EEXIST; 4993 if (mddev->gendisk) 4994 goto abort; 4995 4996 if (name) { 4997 /* Need to ensure that 'name' is not a duplicate. 4998 */ 4999 struct mddev *mddev2; 5000 spin_lock(&all_mddevs_lock); 5001 5002 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) 5003 if (mddev2->gendisk && 5004 strcmp(mddev2->gendisk->disk_name, name) == 0) { 5005 spin_unlock(&all_mddevs_lock); 5006 goto abort; 5007 } 5008 spin_unlock(&all_mddevs_lock); 5009 } 5010 5011 error = -ENOMEM; 5012 mddev->queue = blk_alloc_queue(GFP_KERNEL); 5013 if (!mddev->queue) 5014 goto abort; 5015 mddev->queue->queuedata = mddev; 5016 5017 blk_queue_make_request(mddev->queue, md_make_request); 5018 blk_set_stacking_limits(&mddev->queue->limits); 5019 5020 disk = alloc_disk(1 << shift); 5021 if (!disk) { 5022 blk_cleanup_queue(mddev->queue); 5023 mddev->queue = NULL; 5024 goto abort; 5025 } 5026 disk->major = MAJOR(mddev->unit); 5027 disk->first_minor = unit << shift; 5028 if (name) 5029 strcpy(disk->disk_name, name); 5030 else if (partitioned) 5031 sprintf(disk->disk_name, "md_d%d", unit); 5032 else 5033 sprintf(disk->disk_name, "md%d", unit); 5034 disk->fops = &md_fops; 5035 disk->private_data = mddev; 5036 disk->queue = mddev->queue; 5037 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); 5038 /* Allow extended partitions. This makes the 5039 * 'mdp' device redundant, but we can't really 5040 * remove it now. 5041 */ 5042 disk->flags |= GENHD_FL_EXT_DEVT; 5043 mddev->gendisk = disk; 5044 /* As soon as we call add_disk(), another thread could get 5045 * through to md_open, so make sure it doesn't get too far 5046 */ 5047 mutex_lock(&mddev->open_mutex); 5048 add_disk(disk); 5049 5050 error = kobject_init_and_add(&mddev->kobj, &md_ktype, 5051 &disk_to_dev(disk)->kobj, "%s", "md"); 5052 if (error) { 5053 /* This isn't possible, but as kobject_init_and_add is marked 5054 * __must_check, we must do something with the result 5055 */ 5056 printk(KERN_WARNING "md: cannot register %s/md - name in use\n", 5057 disk->disk_name); 5058 error = 0; 5059 } 5060 if (mddev->kobj.sd && 5061 sysfs_create_group(&mddev->kobj, &md_bitmap_group)) 5062 printk(KERN_DEBUG "pointless warning\n"); 5063 mutex_unlock(&mddev->open_mutex); 5064 abort: 5065 mutex_unlock(&disks_mutex); 5066 if (!error && mddev->kobj.sd) { 5067 kobject_uevent(&mddev->kobj, KOBJ_ADD); 5068 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); 5069 } 5070 mddev_put(mddev); 5071 return error; 5072 } 5073 5074 static struct kobject *md_probe(dev_t dev, int *part, void *data) 5075 { 5076 md_alloc(dev, NULL); 5077 return NULL; 5078 } 5079 5080 static int add_named_array(const char *val, struct kernel_param *kp) 5081 { 5082 /* val must be "md_*" where * is not all digits. 5083 * We allocate an array with a large free minor number, and 5084 * set the name to val. val must not already be an active name. 5085 */ 5086 int len = strlen(val); 5087 char buf[DISK_NAME_LEN]; 5088 5089 while (len && val[len-1] == '\n') 5090 len--; 5091 if (len >= DISK_NAME_LEN) 5092 return -E2BIG; 5093 strlcpy(buf, val, len+1); 5094 if (strncmp(buf, "md_", 3) != 0) 5095 return -EINVAL; 5096 return md_alloc(0, buf); 5097 } 5098 5099 static void md_safemode_timeout(unsigned long data) 5100 { 5101 struct mddev *mddev = (struct mddev *) data; 5102 5103 if (!atomic_read(&mddev->writes_pending)) { 5104 mddev->safemode = 1; 5105 if (mddev->external) 5106 sysfs_notify_dirent_safe(mddev->sysfs_state); 5107 } 5108 md_wakeup_thread(mddev->thread); 5109 } 5110 5111 static int start_dirty_degraded; 5112 5113 int md_run(struct mddev *mddev) 5114 { 5115 int err; 5116 struct md_rdev *rdev; 5117 struct md_personality *pers; 5118 5119 if (list_empty(&mddev->disks)) 5120 /* cannot run an array with no devices.. */ 5121 return -EINVAL; 5122 5123 if (mddev->pers) 5124 return -EBUSY; 5125 /* Cannot run until previous stop completes properly */ 5126 if (mddev->sysfs_active) 5127 return -EBUSY; 5128 5129 /* 5130 * Analyze all RAID superblock(s) 5131 */ 5132 if (!mddev->raid_disks) { 5133 if (!mddev->persistent) 5134 return -EINVAL; 5135 analyze_sbs(mddev); 5136 } 5137 5138 if (mddev->level != LEVEL_NONE) 5139 request_module("md-level-%d", mddev->level); 5140 else if (mddev->clevel[0]) 5141 request_module("md-%s", mddev->clevel); 5142 5143 /* 5144 * Drop all container device buffers, from now on 5145 * the only valid external interface is through the md 5146 * device. 5147 */ 5148 rdev_for_each(rdev, mddev) { 5149 if (test_bit(Faulty, &rdev->flags)) 5150 continue; 5151 sync_blockdev(rdev->bdev); 5152 invalidate_bdev(rdev->bdev); 5153 5154 /* perform some consistency tests on the device. 5155 * We don't want the data to overlap the metadata, 5156 * Internal Bitmap issues have been handled elsewhere. 5157 */ 5158 if (rdev->meta_bdev) { 5159 /* Nothing to check */; 5160 } else if (rdev->data_offset < rdev->sb_start) { 5161 if (mddev->dev_sectors && 5162 rdev->data_offset + mddev->dev_sectors 5163 > rdev->sb_start) { 5164 printk("md: %s: data overlaps metadata\n", 5165 mdname(mddev)); 5166 return -EINVAL; 5167 } 5168 } else { 5169 if (rdev->sb_start + rdev->sb_size/512 5170 > rdev->data_offset) { 5171 printk("md: %s: metadata overlaps data\n", 5172 mdname(mddev)); 5173 return -EINVAL; 5174 } 5175 } 5176 sysfs_notify_dirent_safe(rdev->sysfs_state); 5177 } 5178 5179 if (mddev->bio_set == NULL) 5180 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); 5181 5182 spin_lock(&pers_lock); 5183 pers = find_pers(mddev->level, mddev->clevel); 5184 if (!pers || !try_module_get(pers->owner)) { 5185 spin_unlock(&pers_lock); 5186 if (mddev->level != LEVEL_NONE) 5187 printk(KERN_WARNING "md: personality for level %d is not loaded!\n", 5188 mddev->level); 5189 else 5190 printk(KERN_WARNING "md: personality for level %s is not loaded!\n", 5191 mddev->clevel); 5192 return -EINVAL; 5193 } 5194 spin_unlock(&pers_lock); 5195 if (mddev->level != pers->level) { 5196 mddev->level = pers->level; 5197 mddev->new_level = pers->level; 5198 } 5199 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 5200 5201 if (mddev->reshape_position != MaxSector && 5202 pers->start_reshape == NULL) { 5203 /* This personality cannot handle reshaping... */ 5204 module_put(pers->owner); 5205 return -EINVAL; 5206 } 5207 5208 if (pers->sync_request) { 5209 /* Warn if this is a potentially silly 5210 * configuration. 5211 */ 5212 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 5213 struct md_rdev *rdev2; 5214 int warned = 0; 5215 5216 rdev_for_each(rdev, mddev) 5217 rdev_for_each(rdev2, mddev) { 5218 if (rdev < rdev2 && 5219 rdev->bdev->bd_contains == 5220 rdev2->bdev->bd_contains) { 5221 printk(KERN_WARNING 5222 "%s: WARNING: %s appears to be" 5223 " on the same physical disk as" 5224 " %s.\n", 5225 mdname(mddev), 5226 bdevname(rdev->bdev,b), 5227 bdevname(rdev2->bdev,b2)); 5228 warned = 1; 5229 } 5230 } 5231 5232 if (warned) 5233 printk(KERN_WARNING 5234 "True protection against single-disk" 5235 " failure might be compromised.\n"); 5236 } 5237 5238 mddev->recovery = 0; 5239 /* may be over-ridden by personality */ 5240 mddev->resync_max_sectors = mddev->dev_sectors; 5241 5242 mddev->ok_start_degraded = start_dirty_degraded; 5243 5244 if (start_readonly && mddev->ro == 0) 5245 mddev->ro = 2; /* read-only, but switch on first write */ 5246 5247 err = pers->run(mddev); 5248 if (err) 5249 printk(KERN_ERR "md: pers->run() failed ...\n"); 5250 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { 5251 WARN_ONCE(!mddev->external_size, "%s: default size too small," 5252 " but 'external_size' not in effect?\n", __func__); 5253 printk(KERN_ERR 5254 "md: invalid array_size %llu > default size %llu\n", 5255 (unsigned long long)mddev->array_sectors / 2, 5256 (unsigned long long)pers->size(mddev, 0, 0) / 2); 5257 err = -EINVAL; 5258 } 5259 if (err == 0 && pers->sync_request && 5260 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { 5261 struct bitmap *bitmap; 5262 5263 bitmap = bitmap_create(mddev, -1); 5264 if (IS_ERR(bitmap)) { 5265 err = PTR_ERR(bitmap); 5266 printk(KERN_ERR "%s: failed to create bitmap (%d)\n", 5267 mdname(mddev), err); 5268 } else 5269 mddev->bitmap = bitmap; 5270 5271 } 5272 if (err) { 5273 mddev_detach(mddev); 5274 if (mddev->private) 5275 pers->free(mddev, mddev->private); 5276 mddev->private = NULL; 5277 module_put(pers->owner); 5278 bitmap_destroy(mddev); 5279 return err; 5280 } 5281 if (mddev->queue) { 5282 mddev->queue->backing_dev_info.congested_data = mddev; 5283 mddev->queue->backing_dev_info.congested_fn = md_congested; 5284 } 5285 if (pers->sync_request) { 5286 if (mddev->kobj.sd && 5287 sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 5288 printk(KERN_WARNING 5289 "md: cannot register extra attributes for %s\n", 5290 mdname(mddev)); 5291 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); 5292 } else if (mddev->ro == 2) /* auto-readonly not meaningful */ 5293 mddev->ro = 0; 5294 5295 atomic_set(&mddev->writes_pending,0); 5296 atomic_set(&mddev->max_corr_read_errors, 5297 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); 5298 mddev->safemode = 0; 5299 if (mddev_is_clustered(mddev)) 5300 mddev->safemode_delay = 0; 5301 else 5302 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ 5303 mddev->in_sync = 1; 5304 smp_wmb(); 5305 spin_lock(&mddev->lock); 5306 mddev->pers = pers; 5307 spin_unlock(&mddev->lock); 5308 rdev_for_each(rdev, mddev) 5309 if (rdev->raid_disk >= 0) 5310 if (sysfs_link_rdev(mddev, rdev)) 5311 /* failure here is OK */; 5312 5313 if (mddev->degraded && !mddev->ro) 5314 /* This ensures that recovering status is reported immediately 5315 * via sysfs - until a lack of spares is confirmed. 5316 */ 5317 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 5318 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5319 5320 if (mddev->flags & MD_UPDATE_SB_FLAGS) 5321 md_update_sb(mddev, 0); 5322 5323 md_new_event(mddev); 5324 sysfs_notify_dirent_safe(mddev->sysfs_state); 5325 sysfs_notify_dirent_safe(mddev->sysfs_action); 5326 sysfs_notify(&mddev->kobj, NULL, "degraded"); 5327 return 0; 5328 } 5329 EXPORT_SYMBOL_GPL(md_run); 5330 5331 static int do_md_run(struct mddev *mddev) 5332 { 5333 int err; 5334 5335 err = md_run(mddev); 5336 if (err) 5337 goto out; 5338 err = bitmap_load(mddev); 5339 if (err) { 5340 bitmap_destroy(mddev); 5341 goto out; 5342 } 5343 5344 if (mddev_is_clustered(mddev)) 5345 md_allow_write(mddev); 5346 5347 md_wakeup_thread(mddev->thread); 5348 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 5349 5350 set_capacity(mddev->gendisk, mddev->array_sectors); 5351 revalidate_disk(mddev->gendisk); 5352 mddev->changed = 1; 5353 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 5354 out: 5355 return err; 5356 } 5357 5358 static int restart_array(struct mddev *mddev) 5359 { 5360 struct gendisk *disk = mddev->gendisk; 5361 5362 /* Complain if it has no devices */ 5363 if (list_empty(&mddev->disks)) 5364 return -ENXIO; 5365 if (!mddev->pers) 5366 return -EINVAL; 5367 if (!mddev->ro) 5368 return -EBUSY; 5369 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { 5370 struct md_rdev *rdev; 5371 bool has_journal = false; 5372 5373 rcu_read_lock(); 5374 rdev_for_each_rcu(rdev, mddev) { 5375 if (test_bit(Journal, &rdev->flags) && 5376 !test_bit(Faulty, &rdev->flags)) { 5377 has_journal = true; 5378 break; 5379 } 5380 } 5381 rcu_read_unlock(); 5382 5383 /* Don't restart rw with journal missing/faulty */ 5384 if (!has_journal) 5385 return -EINVAL; 5386 } 5387 5388 mddev->safemode = 0; 5389 mddev->ro = 0; 5390 set_disk_ro(disk, 0); 5391 printk(KERN_INFO "md: %s switched to read-write mode.\n", 5392 mdname(mddev)); 5393 /* Kick recovery or resync if necessary */ 5394 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5395 md_wakeup_thread(mddev->thread); 5396 md_wakeup_thread(mddev->sync_thread); 5397 sysfs_notify_dirent_safe(mddev->sysfs_state); 5398 return 0; 5399 } 5400 5401 static void md_clean(struct mddev *mddev) 5402 { 5403 mddev->array_sectors = 0; 5404 mddev->external_size = 0; 5405 mddev->dev_sectors = 0; 5406 mddev->raid_disks = 0; 5407 mddev->recovery_cp = 0; 5408 mddev->resync_min = 0; 5409 mddev->resync_max = MaxSector; 5410 mddev->reshape_position = MaxSector; 5411 mddev->external = 0; 5412 mddev->persistent = 0; 5413 mddev->level = LEVEL_NONE; 5414 mddev->clevel[0] = 0; 5415 mddev->flags = 0; 5416 mddev->ro = 0; 5417 mddev->metadata_type[0] = 0; 5418 mddev->chunk_sectors = 0; 5419 mddev->ctime = mddev->utime = 0; 5420 mddev->layout = 0; 5421 mddev->max_disks = 0; 5422 mddev->events = 0; 5423 mddev->can_decrease_events = 0; 5424 mddev->delta_disks = 0; 5425 mddev->reshape_backwards = 0; 5426 mddev->new_level = LEVEL_NONE; 5427 mddev->new_layout = 0; 5428 mddev->new_chunk_sectors = 0; 5429 mddev->curr_resync = 0; 5430 atomic64_set(&mddev->resync_mismatches, 0); 5431 mddev->suspend_lo = mddev->suspend_hi = 0; 5432 mddev->sync_speed_min = mddev->sync_speed_max = 0; 5433 mddev->recovery = 0; 5434 mddev->in_sync = 0; 5435 mddev->changed = 0; 5436 mddev->degraded = 0; 5437 mddev->safemode = 0; 5438 mddev->private = NULL; 5439 mddev->bitmap_info.offset = 0; 5440 mddev->bitmap_info.default_offset = 0; 5441 mddev->bitmap_info.default_space = 0; 5442 mddev->bitmap_info.chunksize = 0; 5443 mddev->bitmap_info.daemon_sleep = 0; 5444 mddev->bitmap_info.max_write_behind = 0; 5445 } 5446 5447 static void __md_stop_writes(struct mddev *mddev) 5448 { 5449 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5450 flush_workqueue(md_misc_wq); 5451 if (mddev->sync_thread) { 5452 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5453 md_reap_sync_thread(mddev); 5454 } 5455 5456 del_timer_sync(&mddev->safemode_timer); 5457 5458 bitmap_flush(mddev); 5459 md_super_wait(mddev); 5460 5461 if (mddev->ro == 0 && 5462 ((!mddev->in_sync && !mddev_is_clustered(mddev)) || 5463 (mddev->flags & MD_UPDATE_SB_FLAGS))) { 5464 /* mark array as shutdown cleanly */ 5465 if (!mddev_is_clustered(mddev)) 5466 mddev->in_sync = 1; 5467 md_update_sb(mddev, 1); 5468 } 5469 } 5470 5471 void md_stop_writes(struct mddev *mddev) 5472 { 5473 mddev_lock_nointr(mddev); 5474 __md_stop_writes(mddev); 5475 mddev_unlock(mddev); 5476 } 5477 EXPORT_SYMBOL_GPL(md_stop_writes); 5478 5479 static void mddev_detach(struct mddev *mddev) 5480 { 5481 struct bitmap *bitmap = mddev->bitmap; 5482 /* wait for behind writes to complete */ 5483 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { 5484 printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", 5485 mdname(mddev)); 5486 /* need to kick something here to make sure I/O goes? */ 5487 wait_event(bitmap->behind_wait, 5488 atomic_read(&bitmap->behind_writes) == 0); 5489 } 5490 if (mddev->pers && mddev->pers->quiesce) { 5491 mddev->pers->quiesce(mddev, 1); 5492 mddev->pers->quiesce(mddev, 0); 5493 } 5494 md_unregister_thread(&mddev->thread); 5495 if (mddev->queue) 5496 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ 5497 } 5498 5499 static void __md_stop(struct mddev *mddev) 5500 { 5501 struct md_personality *pers = mddev->pers; 5502 mddev_detach(mddev); 5503 /* Ensure ->event_work is done */ 5504 flush_workqueue(md_misc_wq); 5505 spin_lock(&mddev->lock); 5506 mddev->pers = NULL; 5507 spin_unlock(&mddev->lock); 5508 pers->free(mddev, mddev->private); 5509 mddev->private = NULL; 5510 if (pers->sync_request && mddev->to_remove == NULL) 5511 mddev->to_remove = &md_redundancy_group; 5512 module_put(pers->owner); 5513 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5514 } 5515 5516 void md_stop(struct mddev *mddev) 5517 { 5518 /* stop the array and free an attached data structures. 5519 * This is called from dm-raid 5520 */ 5521 __md_stop(mddev); 5522 bitmap_destroy(mddev); 5523 if (mddev->bio_set) 5524 bioset_free(mddev->bio_set); 5525 } 5526 5527 EXPORT_SYMBOL_GPL(md_stop); 5528 5529 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) 5530 { 5531 int err = 0; 5532 int did_freeze = 0; 5533 5534 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { 5535 did_freeze = 1; 5536 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5537 md_wakeup_thread(mddev->thread); 5538 } 5539 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 5540 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5541 if (mddev->sync_thread) 5542 /* Thread might be blocked waiting for metadata update 5543 * which will now never happen */ 5544 wake_up_process(mddev->sync_thread->tsk); 5545 5546 if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags)) 5547 return -EBUSY; 5548 mddev_unlock(mddev); 5549 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, 5550 &mddev->recovery)); 5551 wait_event(mddev->sb_wait, 5552 !test_bit(MD_CHANGE_PENDING, &mddev->flags)); 5553 mddev_lock_nointr(mddev); 5554 5555 mutex_lock(&mddev->open_mutex); 5556 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || 5557 mddev->sync_thread || 5558 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 5559 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { 5560 printk("md: %s still in use.\n",mdname(mddev)); 5561 if (did_freeze) { 5562 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5563 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5564 md_wakeup_thread(mddev->thread); 5565 } 5566 err = -EBUSY; 5567 goto out; 5568 } 5569 if (mddev->pers) { 5570 __md_stop_writes(mddev); 5571 5572 err = -ENXIO; 5573 if (mddev->ro==1) 5574 goto out; 5575 mddev->ro = 1; 5576 set_disk_ro(mddev->gendisk, 1); 5577 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5578 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5579 md_wakeup_thread(mddev->thread); 5580 sysfs_notify_dirent_safe(mddev->sysfs_state); 5581 err = 0; 5582 } 5583 out: 5584 mutex_unlock(&mddev->open_mutex); 5585 return err; 5586 } 5587 5588 /* mode: 5589 * 0 - completely stop and dis-assemble array 5590 * 2 - stop but do not disassemble array 5591 */ 5592 static int do_md_stop(struct mddev *mddev, int mode, 5593 struct block_device *bdev) 5594 { 5595 struct gendisk *disk = mddev->gendisk; 5596 struct md_rdev *rdev; 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 mddev_unlock(mddev); 5612 wait_event(resync_wait, (mddev->sync_thread == NULL && 5613 !test_bit(MD_RECOVERY_RUNNING, 5614 &mddev->recovery))); 5615 mddev_lock_nointr(mddev); 5616 5617 mutex_lock(&mddev->open_mutex); 5618 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || 5619 mddev->sysfs_active || 5620 mddev->sync_thread || 5621 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 5622 (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { 5623 printk("md: %s still in use.\n",mdname(mddev)); 5624 mutex_unlock(&mddev->open_mutex); 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 return -EBUSY; 5631 } 5632 if (mddev->pers) { 5633 if (mddev->ro) 5634 set_disk_ro(disk, 0); 5635 5636 __md_stop_writes(mddev); 5637 __md_stop(mddev); 5638 mddev->queue->backing_dev_info.congested_fn = NULL; 5639 5640 /* tell userspace to handle 'inactive' */ 5641 sysfs_notify_dirent_safe(mddev->sysfs_state); 5642 5643 rdev_for_each(rdev, mddev) 5644 if (rdev->raid_disk >= 0) 5645 sysfs_unlink_rdev(mddev, rdev); 5646 5647 set_capacity(disk, 0); 5648 mutex_unlock(&mddev->open_mutex); 5649 mddev->changed = 1; 5650 revalidate_disk(disk); 5651 5652 if (mddev->ro) 5653 mddev->ro = 0; 5654 } else 5655 mutex_unlock(&mddev->open_mutex); 5656 /* 5657 * Free resources if final stop 5658 */ 5659 if (mode == 0) { 5660 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); 5661 5662 bitmap_destroy(mddev); 5663 if (mddev->bitmap_info.file) { 5664 struct file *f = mddev->bitmap_info.file; 5665 spin_lock(&mddev->lock); 5666 mddev->bitmap_info.file = NULL; 5667 spin_unlock(&mddev->lock); 5668 fput(f); 5669 } 5670 mddev->bitmap_info.offset = 0; 5671 5672 export_array(mddev); 5673 5674 md_clean(mddev); 5675 if (mddev->hold_active == UNTIL_STOP) 5676 mddev->hold_active = 0; 5677 } 5678 md_new_event(mddev); 5679 sysfs_notify_dirent_safe(mddev->sysfs_state); 5680 return 0; 5681 } 5682 5683 #ifndef MODULE 5684 static void autorun_array(struct mddev *mddev) 5685 { 5686 struct md_rdev *rdev; 5687 int err; 5688 5689 if (list_empty(&mddev->disks)) 5690 return; 5691 5692 printk(KERN_INFO "md: running: "); 5693 5694 rdev_for_each(rdev, mddev) { 5695 char b[BDEVNAME_SIZE]; 5696 printk("<%s>", bdevname(rdev->bdev,b)); 5697 } 5698 printk("\n"); 5699 5700 err = do_md_run(mddev); 5701 if (err) { 5702 printk(KERN_WARNING "md: do_md_run() returned %d\n", err); 5703 do_md_stop(mddev, 0, NULL); 5704 } 5705 } 5706 5707 /* 5708 * lets try to run arrays based on all disks that have arrived 5709 * until now. (those are in pending_raid_disks) 5710 * 5711 * the method: pick the first pending disk, collect all disks with 5712 * the same UUID, remove all from the pending list and put them into 5713 * the 'same_array' list. Then order this list based on superblock 5714 * update time (freshest comes first), kick out 'old' disks and 5715 * compare superblocks. If everything's fine then run it. 5716 * 5717 * If "unit" is allocated, then bump its reference count 5718 */ 5719 static void autorun_devices(int part) 5720 { 5721 struct md_rdev *rdev0, *rdev, *tmp; 5722 struct mddev *mddev; 5723 char b[BDEVNAME_SIZE]; 5724 5725 printk(KERN_INFO "md: autorun ...\n"); 5726 while (!list_empty(&pending_raid_disks)) { 5727 int unit; 5728 dev_t dev; 5729 LIST_HEAD(candidates); 5730 rdev0 = list_entry(pending_raid_disks.next, 5731 struct md_rdev, same_set); 5732 5733 printk(KERN_INFO "md: considering %s ...\n", 5734 bdevname(rdev0->bdev,b)); 5735 INIT_LIST_HEAD(&candidates); 5736 rdev_for_each_list(rdev, tmp, &pending_raid_disks) 5737 if (super_90_load(rdev, rdev0, 0) >= 0) { 5738 printk(KERN_INFO "md: adding %s ...\n", 5739 bdevname(rdev->bdev,b)); 5740 list_move(&rdev->same_set, &candidates); 5741 } 5742 /* 5743 * now we have a set of devices, with all of them having 5744 * mostly sane superblocks. It's time to allocate the 5745 * mddev. 5746 */ 5747 if (part) { 5748 dev = MKDEV(mdp_major, 5749 rdev0->preferred_minor << MdpMinorShift); 5750 unit = MINOR(dev) >> MdpMinorShift; 5751 } else { 5752 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 5753 unit = MINOR(dev); 5754 } 5755 if (rdev0->preferred_minor != unit) { 5756 printk(KERN_INFO "md: unit number in %s is bad: %d\n", 5757 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 5758 break; 5759 } 5760 5761 md_probe(dev, NULL, NULL); 5762 mddev = mddev_find(dev); 5763 if (!mddev || !mddev->gendisk) { 5764 if (mddev) 5765 mddev_put(mddev); 5766 printk(KERN_ERR 5767 "md: cannot allocate memory for md drive.\n"); 5768 break; 5769 } 5770 if (mddev_lock(mddev)) 5771 printk(KERN_WARNING "md: %s locked, cannot run\n", 5772 mdname(mddev)); 5773 else if (mddev->raid_disks || mddev->major_version 5774 || !list_empty(&mddev->disks)) { 5775 printk(KERN_WARNING 5776 "md: %s already running, cannot run %s\n", 5777 mdname(mddev), bdevname(rdev0->bdev,b)); 5778 mddev_unlock(mddev); 5779 } else { 5780 printk(KERN_INFO "md: created %s\n", mdname(mddev)); 5781 mddev->persistent = 1; 5782 rdev_for_each_list(rdev, tmp, &candidates) { 5783 list_del_init(&rdev->same_set); 5784 if (bind_rdev_to_array(rdev, mddev)) 5785 export_rdev(rdev); 5786 } 5787 autorun_array(mddev); 5788 mddev_unlock(mddev); 5789 } 5790 /* on success, candidates will be empty, on error 5791 * it won't... 5792 */ 5793 rdev_for_each_list(rdev, tmp, &candidates) { 5794 list_del_init(&rdev->same_set); 5795 export_rdev(rdev); 5796 } 5797 mddev_put(mddev); 5798 } 5799 printk(KERN_INFO "md: ... autorun DONE.\n"); 5800 } 5801 #endif /* !MODULE */ 5802 5803 static int get_version(void __user *arg) 5804 { 5805 mdu_version_t ver; 5806 5807 ver.major = MD_MAJOR_VERSION; 5808 ver.minor = MD_MINOR_VERSION; 5809 ver.patchlevel = MD_PATCHLEVEL_VERSION; 5810 5811 if (copy_to_user(arg, &ver, sizeof(ver))) 5812 return -EFAULT; 5813 5814 return 0; 5815 } 5816 5817 static int get_array_info(struct mddev *mddev, void __user *arg) 5818 { 5819 mdu_array_info_t info; 5820 int nr,working,insync,failed,spare; 5821 struct md_rdev *rdev; 5822 5823 nr = working = insync = failed = spare = 0; 5824 rcu_read_lock(); 5825 rdev_for_each_rcu(rdev, mddev) { 5826 nr++; 5827 if (test_bit(Faulty, &rdev->flags)) 5828 failed++; 5829 else { 5830 working++; 5831 if (test_bit(In_sync, &rdev->flags)) 5832 insync++; 5833 else 5834 spare++; 5835 } 5836 } 5837 rcu_read_unlock(); 5838 5839 info.major_version = mddev->major_version; 5840 info.minor_version = mddev->minor_version; 5841 info.patch_version = MD_PATCHLEVEL_VERSION; 5842 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); 5843 info.level = mddev->level; 5844 info.size = mddev->dev_sectors / 2; 5845 if (info.size != mddev->dev_sectors / 2) /* overflow */ 5846 info.size = -1; 5847 info.nr_disks = nr; 5848 info.raid_disks = mddev->raid_disks; 5849 info.md_minor = mddev->md_minor; 5850 info.not_persistent= !mddev->persistent; 5851 5852 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); 5853 info.state = 0; 5854 if (mddev->in_sync) 5855 info.state = (1<<MD_SB_CLEAN); 5856 if (mddev->bitmap && mddev->bitmap_info.offset) 5857 info.state |= (1<<MD_SB_BITMAP_PRESENT); 5858 if (mddev_is_clustered(mddev)) 5859 info.state |= (1<<MD_SB_CLUSTERED); 5860 info.active_disks = insync; 5861 info.working_disks = working; 5862 info.failed_disks = failed; 5863 info.spare_disks = spare; 5864 5865 info.layout = mddev->layout; 5866 info.chunk_size = mddev->chunk_sectors << 9; 5867 5868 if (copy_to_user(arg, &info, sizeof(info))) 5869 return -EFAULT; 5870 5871 return 0; 5872 } 5873 5874 static int get_bitmap_file(struct mddev *mddev, void __user * arg) 5875 { 5876 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 5877 char *ptr; 5878 int err; 5879 5880 file = kzalloc(sizeof(*file), GFP_NOIO); 5881 if (!file) 5882 return -ENOMEM; 5883 5884 err = 0; 5885 spin_lock(&mddev->lock); 5886 /* bitmap enabled */ 5887 if (mddev->bitmap_info.file) { 5888 ptr = file_path(mddev->bitmap_info.file, file->pathname, 5889 sizeof(file->pathname)); 5890 if (IS_ERR(ptr)) 5891 err = PTR_ERR(ptr); 5892 else 5893 memmove(file->pathname, ptr, 5894 sizeof(file->pathname)-(ptr-file->pathname)); 5895 } 5896 spin_unlock(&mddev->lock); 5897 5898 if (err == 0 && 5899 copy_to_user(arg, file, sizeof(*file))) 5900 err = -EFAULT; 5901 5902 kfree(file); 5903 return err; 5904 } 5905 5906 static int get_disk_info(struct mddev *mddev, void __user * arg) 5907 { 5908 mdu_disk_info_t info; 5909 struct md_rdev *rdev; 5910 5911 if (copy_from_user(&info, arg, sizeof(info))) 5912 return -EFAULT; 5913 5914 rcu_read_lock(); 5915 rdev = md_find_rdev_nr_rcu(mddev, info.number); 5916 if (rdev) { 5917 info.major = MAJOR(rdev->bdev->bd_dev); 5918 info.minor = MINOR(rdev->bdev->bd_dev); 5919 info.raid_disk = rdev->raid_disk; 5920 info.state = 0; 5921 if (test_bit(Faulty, &rdev->flags)) 5922 info.state |= (1<<MD_DISK_FAULTY); 5923 else if (test_bit(In_sync, &rdev->flags)) { 5924 info.state |= (1<<MD_DISK_ACTIVE); 5925 info.state |= (1<<MD_DISK_SYNC); 5926 } 5927 if (test_bit(Journal, &rdev->flags)) 5928 info.state |= (1<<MD_DISK_JOURNAL); 5929 if (test_bit(WriteMostly, &rdev->flags)) 5930 info.state |= (1<<MD_DISK_WRITEMOSTLY); 5931 } else { 5932 info.major = info.minor = 0; 5933 info.raid_disk = -1; 5934 info.state = (1<<MD_DISK_REMOVED); 5935 } 5936 rcu_read_unlock(); 5937 5938 if (copy_to_user(arg, &info, sizeof(info))) 5939 return -EFAULT; 5940 5941 return 0; 5942 } 5943 5944 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) 5945 { 5946 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 5947 struct md_rdev *rdev; 5948 dev_t dev = MKDEV(info->major,info->minor); 5949 5950 if (mddev_is_clustered(mddev) && 5951 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { 5952 pr_err("%s: Cannot add to clustered mddev.\n", 5953 mdname(mddev)); 5954 return -EINVAL; 5955 } 5956 5957 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 5958 return -EOVERFLOW; 5959 5960 if (!mddev->raid_disks) { 5961 int err; 5962 /* expecting a device which has a superblock */ 5963 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 5964 if (IS_ERR(rdev)) { 5965 printk(KERN_WARNING 5966 "md: md_import_device returned %ld\n", 5967 PTR_ERR(rdev)); 5968 return PTR_ERR(rdev); 5969 } 5970 if (!list_empty(&mddev->disks)) { 5971 struct md_rdev *rdev0 5972 = list_entry(mddev->disks.next, 5973 struct md_rdev, same_set); 5974 err = super_types[mddev->major_version] 5975 .load_super(rdev, rdev0, mddev->minor_version); 5976 if (err < 0) { 5977 printk(KERN_WARNING 5978 "md: %s has different UUID to %s\n", 5979 bdevname(rdev->bdev,b), 5980 bdevname(rdev0->bdev,b2)); 5981 export_rdev(rdev); 5982 return -EINVAL; 5983 } 5984 } 5985 err = bind_rdev_to_array(rdev, mddev); 5986 if (err) 5987 export_rdev(rdev); 5988 return err; 5989 } 5990 5991 /* 5992 * add_new_disk can be used once the array is assembled 5993 * to add "hot spares". They must already have a superblock 5994 * written 5995 */ 5996 if (mddev->pers) { 5997 int err; 5998 if (!mddev->pers->hot_add_disk) { 5999 printk(KERN_WARNING 6000 "%s: personality does not support diskops!\n", 6001 mdname(mddev)); 6002 return -EINVAL; 6003 } 6004 if (mddev->persistent) 6005 rdev = md_import_device(dev, mddev->major_version, 6006 mddev->minor_version); 6007 else 6008 rdev = md_import_device(dev, -1, -1); 6009 if (IS_ERR(rdev)) { 6010 printk(KERN_WARNING 6011 "md: md_import_device returned %ld\n", 6012 PTR_ERR(rdev)); 6013 return PTR_ERR(rdev); 6014 } 6015 /* set saved_raid_disk if appropriate */ 6016 if (!mddev->persistent) { 6017 if (info->state & (1<<MD_DISK_SYNC) && 6018 info->raid_disk < mddev->raid_disks) { 6019 rdev->raid_disk = info->raid_disk; 6020 set_bit(In_sync, &rdev->flags); 6021 clear_bit(Bitmap_sync, &rdev->flags); 6022 } else 6023 rdev->raid_disk = -1; 6024 rdev->saved_raid_disk = rdev->raid_disk; 6025 } else 6026 super_types[mddev->major_version]. 6027 validate_super(mddev, rdev); 6028 if ((info->state & (1<<MD_DISK_SYNC)) && 6029 rdev->raid_disk != info->raid_disk) { 6030 /* This was a hot-add request, but events doesn't 6031 * match, so reject it. 6032 */ 6033 export_rdev(rdev); 6034 return -EINVAL; 6035 } 6036 6037 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 6038 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 6039 set_bit(WriteMostly, &rdev->flags); 6040 else 6041 clear_bit(WriteMostly, &rdev->flags); 6042 6043 if (info->state & (1<<MD_DISK_JOURNAL)) { 6044 struct md_rdev *rdev2; 6045 bool has_journal = false; 6046 6047 /* make sure no existing journal disk */ 6048 rdev_for_each(rdev2, mddev) { 6049 if (test_bit(Journal, &rdev2->flags)) { 6050 has_journal = true; 6051 break; 6052 } 6053 } 6054 if (has_journal) { 6055 export_rdev(rdev); 6056 return -EBUSY; 6057 } 6058 set_bit(Journal, &rdev->flags); 6059 } 6060 /* 6061 * check whether the device shows up in other nodes 6062 */ 6063 if (mddev_is_clustered(mddev)) { 6064 if (info->state & (1 << MD_DISK_CANDIDATE)) 6065 set_bit(Candidate, &rdev->flags); 6066 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { 6067 /* --add initiated by this node */ 6068 err = md_cluster_ops->add_new_disk(mddev, rdev); 6069 if (err) { 6070 export_rdev(rdev); 6071 return err; 6072 } 6073 } 6074 } 6075 6076 rdev->raid_disk = -1; 6077 err = bind_rdev_to_array(rdev, mddev); 6078 6079 if (err) 6080 export_rdev(rdev); 6081 6082 if (mddev_is_clustered(mddev)) { 6083 if (info->state & (1 << MD_DISK_CANDIDATE)) 6084 md_cluster_ops->new_disk_ack(mddev, (err == 0)); 6085 else { 6086 if (err) 6087 md_cluster_ops->add_new_disk_cancel(mddev); 6088 else 6089 err = add_bound_rdev(rdev); 6090 } 6091 6092 } else if (!err) 6093 err = add_bound_rdev(rdev); 6094 6095 return err; 6096 } 6097 6098 /* otherwise, add_new_disk is only allowed 6099 * for major_version==0 superblocks 6100 */ 6101 if (mddev->major_version != 0) { 6102 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", 6103 mdname(mddev)); 6104 return -EINVAL; 6105 } 6106 6107 if (!(info->state & (1<<MD_DISK_FAULTY))) { 6108 int err; 6109 rdev = md_import_device(dev, -1, 0); 6110 if (IS_ERR(rdev)) { 6111 printk(KERN_WARNING 6112 "md: error, md_import_device() returned %ld\n", 6113 PTR_ERR(rdev)); 6114 return PTR_ERR(rdev); 6115 } 6116 rdev->desc_nr = info->number; 6117 if (info->raid_disk < mddev->raid_disks) 6118 rdev->raid_disk = info->raid_disk; 6119 else 6120 rdev->raid_disk = -1; 6121 6122 if (rdev->raid_disk < mddev->raid_disks) 6123 if (info->state & (1<<MD_DISK_SYNC)) 6124 set_bit(In_sync, &rdev->flags); 6125 6126 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 6127 set_bit(WriteMostly, &rdev->flags); 6128 6129 if (!mddev->persistent) { 6130 printk(KERN_INFO "md: nonpersistent superblock ...\n"); 6131 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 6132 } else 6133 rdev->sb_start = calc_dev_sboffset(rdev); 6134 rdev->sectors = rdev->sb_start; 6135 6136 err = bind_rdev_to_array(rdev, mddev); 6137 if (err) { 6138 export_rdev(rdev); 6139 return err; 6140 } 6141 } 6142 6143 return 0; 6144 } 6145 6146 static int hot_remove_disk(struct mddev *mddev, dev_t dev) 6147 { 6148 char b[BDEVNAME_SIZE]; 6149 struct md_rdev *rdev; 6150 6151 rdev = find_rdev(mddev, dev); 6152 if (!rdev) 6153 return -ENXIO; 6154 6155 if (rdev->raid_disk < 0) 6156 goto kick_rdev; 6157 6158 clear_bit(Blocked, &rdev->flags); 6159 remove_and_add_spares(mddev, rdev); 6160 6161 if (rdev->raid_disk >= 0) 6162 goto busy; 6163 6164 kick_rdev: 6165 if (mddev_is_clustered(mddev)) 6166 md_cluster_ops->remove_disk(mddev, rdev); 6167 6168 md_kick_rdev_from_array(rdev); 6169 md_update_sb(mddev, 1); 6170 md_new_event(mddev); 6171 6172 return 0; 6173 busy: 6174 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", 6175 bdevname(rdev->bdev,b), mdname(mddev)); 6176 return -EBUSY; 6177 } 6178 6179 static int hot_add_disk(struct mddev *mddev, dev_t dev) 6180 { 6181 char b[BDEVNAME_SIZE]; 6182 int err; 6183 struct md_rdev *rdev; 6184 6185 if (!mddev->pers) 6186 return -ENODEV; 6187 6188 if (mddev->major_version != 0) { 6189 printk(KERN_WARNING "%s: HOT_ADD may only be used with" 6190 " version-0 superblocks.\n", 6191 mdname(mddev)); 6192 return -EINVAL; 6193 } 6194 if (!mddev->pers->hot_add_disk) { 6195 printk(KERN_WARNING 6196 "%s: personality does not support diskops!\n", 6197 mdname(mddev)); 6198 return -EINVAL; 6199 } 6200 6201 rdev = md_import_device(dev, -1, 0); 6202 if (IS_ERR(rdev)) { 6203 printk(KERN_WARNING 6204 "md: error, md_import_device() returned %ld\n", 6205 PTR_ERR(rdev)); 6206 return -EINVAL; 6207 } 6208 6209 if (mddev->persistent) 6210 rdev->sb_start = calc_dev_sboffset(rdev); 6211 else 6212 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 6213 6214 rdev->sectors = rdev->sb_start; 6215 6216 if (test_bit(Faulty, &rdev->flags)) { 6217 printk(KERN_WARNING 6218 "md: can not hot-add faulty %s disk to %s!\n", 6219 bdevname(rdev->bdev,b), mdname(mddev)); 6220 err = -EINVAL; 6221 goto abort_export; 6222 } 6223 6224 clear_bit(In_sync, &rdev->flags); 6225 rdev->desc_nr = -1; 6226 rdev->saved_raid_disk = -1; 6227 err = bind_rdev_to_array(rdev, mddev); 6228 if (err) 6229 goto abort_export; 6230 6231 /* 6232 * The rest should better be atomic, we can have disk failures 6233 * noticed in interrupt contexts ... 6234 */ 6235 6236 rdev->raid_disk = -1; 6237 6238 md_update_sb(mddev, 1); 6239 /* 6240 * Kick recovery, maybe this spare has to be added to the 6241 * array immediately. 6242 */ 6243 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6244 md_wakeup_thread(mddev->thread); 6245 md_new_event(mddev); 6246 return 0; 6247 6248 abort_export: 6249 export_rdev(rdev); 6250 return err; 6251 } 6252 6253 static int set_bitmap_file(struct mddev *mddev, int fd) 6254 { 6255 int err = 0; 6256 6257 if (mddev->pers) { 6258 if (!mddev->pers->quiesce || !mddev->thread) 6259 return -EBUSY; 6260 if (mddev->recovery || mddev->sync_thread) 6261 return -EBUSY; 6262 /* we should be able to change the bitmap.. */ 6263 } 6264 6265 if (fd >= 0) { 6266 struct inode *inode; 6267 struct file *f; 6268 6269 if (mddev->bitmap || mddev->bitmap_info.file) 6270 return -EEXIST; /* cannot add when bitmap is present */ 6271 f = fget(fd); 6272 6273 if (f == NULL) { 6274 printk(KERN_ERR "%s: error: failed to get bitmap file\n", 6275 mdname(mddev)); 6276 return -EBADF; 6277 } 6278 6279 inode = f->f_mapping->host; 6280 if (!S_ISREG(inode->i_mode)) { 6281 printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", 6282 mdname(mddev)); 6283 err = -EBADF; 6284 } else if (!(f->f_mode & FMODE_WRITE)) { 6285 printk(KERN_ERR "%s: error: bitmap file must open for write\n", 6286 mdname(mddev)); 6287 err = -EBADF; 6288 } else if (atomic_read(&inode->i_writecount) != 1) { 6289 printk(KERN_ERR "%s: error: bitmap file is already in use\n", 6290 mdname(mddev)); 6291 err = -EBUSY; 6292 } 6293 if (err) { 6294 fput(f); 6295 return err; 6296 } 6297 mddev->bitmap_info.file = f; 6298 mddev->bitmap_info.offset = 0; /* file overrides offset */ 6299 } else if (mddev->bitmap == NULL) 6300 return -ENOENT; /* cannot remove what isn't there */ 6301 err = 0; 6302 if (mddev->pers) { 6303 mddev->pers->quiesce(mddev, 1); 6304 if (fd >= 0) { 6305 struct bitmap *bitmap; 6306 6307 bitmap = bitmap_create(mddev, -1); 6308 if (!IS_ERR(bitmap)) { 6309 mddev->bitmap = bitmap; 6310 err = bitmap_load(mddev); 6311 } else 6312 err = PTR_ERR(bitmap); 6313 } 6314 if (fd < 0 || err) { 6315 bitmap_destroy(mddev); 6316 fd = -1; /* make sure to put the file */ 6317 } 6318 mddev->pers->quiesce(mddev, 0); 6319 } 6320 if (fd < 0) { 6321 struct file *f = mddev->bitmap_info.file; 6322 if (f) { 6323 spin_lock(&mddev->lock); 6324 mddev->bitmap_info.file = NULL; 6325 spin_unlock(&mddev->lock); 6326 fput(f); 6327 } 6328 } 6329 6330 return err; 6331 } 6332 6333 /* 6334 * set_array_info is used two different ways 6335 * The original usage is when creating a new array. 6336 * In this usage, raid_disks is > 0 and it together with 6337 * level, size, not_persistent,layout,chunksize determine the 6338 * shape of the array. 6339 * This will always create an array with a type-0.90.0 superblock. 6340 * The newer usage is when assembling an array. 6341 * In this case raid_disks will be 0, and the major_version field is 6342 * use to determine which style super-blocks are to be found on the devices. 6343 * The minor and patch _version numbers are also kept incase the 6344 * super_block handler wishes to interpret them. 6345 */ 6346 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) 6347 { 6348 6349 if (info->raid_disks == 0) { 6350 /* just setting version number for superblock loading */ 6351 if (info->major_version < 0 || 6352 info->major_version >= ARRAY_SIZE(super_types) || 6353 super_types[info->major_version].name == NULL) { 6354 /* maybe try to auto-load a module? */ 6355 printk(KERN_INFO 6356 "md: superblock version %d not known\n", 6357 info->major_version); 6358 return -EINVAL; 6359 } 6360 mddev->major_version = info->major_version; 6361 mddev->minor_version = info->minor_version; 6362 mddev->patch_version = info->patch_version; 6363 mddev->persistent = !info->not_persistent; 6364 /* ensure mddev_put doesn't delete this now that there 6365 * is some minimal configuration. 6366 */ 6367 mddev->ctime = ktime_get_real_seconds(); 6368 return 0; 6369 } 6370 mddev->major_version = MD_MAJOR_VERSION; 6371 mddev->minor_version = MD_MINOR_VERSION; 6372 mddev->patch_version = MD_PATCHLEVEL_VERSION; 6373 mddev->ctime = ktime_get_real_seconds(); 6374 6375 mddev->level = info->level; 6376 mddev->clevel[0] = 0; 6377 mddev->dev_sectors = 2 * (sector_t)info->size; 6378 mddev->raid_disks = info->raid_disks; 6379 /* don't set md_minor, it is determined by which /dev/md* was 6380 * openned 6381 */ 6382 if (info->state & (1<<MD_SB_CLEAN)) 6383 mddev->recovery_cp = MaxSector; 6384 else 6385 mddev->recovery_cp = 0; 6386 mddev->persistent = ! info->not_persistent; 6387 mddev->external = 0; 6388 6389 mddev->layout = info->layout; 6390 mddev->chunk_sectors = info->chunk_size >> 9; 6391 6392 mddev->max_disks = MD_SB_DISKS; 6393 6394 if (mddev->persistent) 6395 mddev->flags = 0; 6396 set_bit(MD_CHANGE_DEVS, &mddev->flags); 6397 6398 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 6399 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); 6400 mddev->bitmap_info.offset = 0; 6401 6402 mddev->reshape_position = MaxSector; 6403 6404 /* 6405 * Generate a 128 bit UUID 6406 */ 6407 get_random_bytes(mddev->uuid, 16); 6408 6409 mddev->new_level = mddev->level; 6410 mddev->new_chunk_sectors = mddev->chunk_sectors; 6411 mddev->new_layout = mddev->layout; 6412 mddev->delta_disks = 0; 6413 mddev->reshape_backwards = 0; 6414 6415 return 0; 6416 } 6417 6418 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) 6419 { 6420 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); 6421 6422 if (mddev->external_size) 6423 return; 6424 6425 mddev->array_sectors = array_sectors; 6426 } 6427 EXPORT_SYMBOL(md_set_array_sectors); 6428 6429 static int update_size(struct mddev *mddev, sector_t num_sectors) 6430 { 6431 struct md_rdev *rdev; 6432 int rv; 6433 int fit = (num_sectors == 0); 6434 6435 if (mddev->pers->resize == NULL) 6436 return -EINVAL; 6437 /* The "num_sectors" is the number of sectors of each device that 6438 * is used. This can only make sense for arrays with redundancy. 6439 * linear and raid0 always use whatever space is available. We can only 6440 * consider changing this number if no resync or reconstruction is 6441 * happening, and if the new size is acceptable. It must fit before the 6442 * sb_start or, if that is <data_offset, it must fit before the size 6443 * of each device. If num_sectors is zero, we find the largest size 6444 * that fits. 6445 */ 6446 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 6447 mddev->sync_thread) 6448 return -EBUSY; 6449 if (mddev->ro) 6450 return -EROFS; 6451 6452 rdev_for_each(rdev, mddev) { 6453 sector_t avail = rdev->sectors; 6454 6455 if (fit && (num_sectors == 0 || num_sectors > avail)) 6456 num_sectors = avail; 6457 if (avail < num_sectors) 6458 return -ENOSPC; 6459 } 6460 rv = mddev->pers->resize(mddev, num_sectors); 6461 if (!rv) 6462 revalidate_disk(mddev->gendisk); 6463 return rv; 6464 } 6465 6466 static int update_raid_disks(struct mddev *mddev, int raid_disks) 6467 { 6468 int rv; 6469 struct md_rdev *rdev; 6470 /* change the number of raid disks */ 6471 if (mddev->pers->check_reshape == NULL) 6472 return -EINVAL; 6473 if (mddev->ro) 6474 return -EROFS; 6475 if (raid_disks <= 0 || 6476 (mddev->max_disks && raid_disks >= mddev->max_disks)) 6477 return -EINVAL; 6478 if (mddev->sync_thread || 6479 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 6480 mddev->reshape_position != MaxSector) 6481 return -EBUSY; 6482 6483 rdev_for_each(rdev, mddev) { 6484 if (mddev->raid_disks < raid_disks && 6485 rdev->data_offset < rdev->new_data_offset) 6486 return -EINVAL; 6487 if (mddev->raid_disks > raid_disks && 6488 rdev->data_offset > rdev->new_data_offset) 6489 return -EINVAL; 6490 } 6491 6492 mddev->delta_disks = raid_disks - mddev->raid_disks; 6493 if (mddev->delta_disks < 0) 6494 mddev->reshape_backwards = 1; 6495 else if (mddev->delta_disks > 0) 6496 mddev->reshape_backwards = 0; 6497 6498 rv = mddev->pers->check_reshape(mddev); 6499 if (rv < 0) { 6500 mddev->delta_disks = 0; 6501 mddev->reshape_backwards = 0; 6502 } 6503 return rv; 6504 } 6505 6506 /* 6507 * update_array_info is used to change the configuration of an 6508 * on-line array. 6509 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 6510 * fields in the info are checked against the array. 6511 * Any differences that cannot be handled will cause an error. 6512 * Normally, only one change can be managed at a time. 6513 */ 6514 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) 6515 { 6516 int rv = 0; 6517 int cnt = 0; 6518 int state = 0; 6519 6520 /* calculate expected state,ignoring low bits */ 6521 if (mddev->bitmap && mddev->bitmap_info.offset) 6522 state |= (1 << MD_SB_BITMAP_PRESENT); 6523 6524 if (mddev->major_version != info->major_version || 6525 mddev->minor_version != info->minor_version || 6526 /* mddev->patch_version != info->patch_version || */ 6527 mddev->ctime != info->ctime || 6528 mddev->level != info->level || 6529 /* mddev->layout != info->layout || */ 6530 mddev->persistent != !info->not_persistent || 6531 mddev->chunk_sectors != info->chunk_size >> 9 || 6532 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 6533 ((state^info->state) & 0xfffffe00) 6534 ) 6535 return -EINVAL; 6536 /* Check there is only one change */ 6537 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 6538 cnt++; 6539 if (mddev->raid_disks != info->raid_disks) 6540 cnt++; 6541 if (mddev->layout != info->layout) 6542 cnt++; 6543 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) 6544 cnt++; 6545 if (cnt == 0) 6546 return 0; 6547 if (cnt > 1) 6548 return -EINVAL; 6549 6550 if (mddev->layout != info->layout) { 6551 /* Change layout 6552 * we don't need to do anything at the md level, the 6553 * personality will take care of it all. 6554 */ 6555 if (mddev->pers->check_reshape == NULL) 6556 return -EINVAL; 6557 else { 6558 mddev->new_layout = info->layout; 6559 rv = mddev->pers->check_reshape(mddev); 6560 if (rv) 6561 mddev->new_layout = mddev->layout; 6562 return rv; 6563 } 6564 } 6565 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 6566 rv = update_size(mddev, (sector_t)info->size * 2); 6567 6568 if (mddev->raid_disks != info->raid_disks) 6569 rv = update_raid_disks(mddev, info->raid_disks); 6570 6571 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 6572 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { 6573 rv = -EINVAL; 6574 goto err; 6575 } 6576 if (mddev->recovery || mddev->sync_thread) { 6577 rv = -EBUSY; 6578 goto err; 6579 } 6580 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 6581 struct bitmap *bitmap; 6582 /* add the bitmap */ 6583 if (mddev->bitmap) { 6584 rv = -EEXIST; 6585 goto err; 6586 } 6587 if (mddev->bitmap_info.default_offset == 0) { 6588 rv = -EINVAL; 6589 goto err; 6590 } 6591 mddev->bitmap_info.offset = 6592 mddev->bitmap_info.default_offset; 6593 mddev->bitmap_info.space = 6594 mddev->bitmap_info.default_space; 6595 mddev->pers->quiesce(mddev, 1); 6596 bitmap = bitmap_create(mddev, -1); 6597 if (!IS_ERR(bitmap)) { 6598 mddev->bitmap = bitmap; 6599 rv = bitmap_load(mddev); 6600 } else 6601 rv = PTR_ERR(bitmap); 6602 if (rv) 6603 bitmap_destroy(mddev); 6604 mddev->pers->quiesce(mddev, 0); 6605 } else { 6606 /* remove the bitmap */ 6607 if (!mddev->bitmap) { 6608 rv = -ENOENT; 6609 goto err; 6610 } 6611 if (mddev->bitmap->storage.file) { 6612 rv = -EINVAL; 6613 goto err; 6614 } 6615 if (mddev->bitmap_info.nodes) { 6616 /* hold PW on all the bitmap lock */ 6617 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { 6618 printk("md: can't change bitmap to none since the" 6619 " array is in use by more than one node\n"); 6620 rv = -EPERM; 6621 md_cluster_ops->unlock_all_bitmaps(mddev); 6622 goto err; 6623 } 6624 6625 mddev->bitmap_info.nodes = 0; 6626 md_cluster_ops->leave(mddev); 6627 } 6628 mddev->pers->quiesce(mddev, 1); 6629 bitmap_destroy(mddev); 6630 mddev->pers->quiesce(mddev, 0); 6631 mddev->bitmap_info.offset = 0; 6632 } 6633 } 6634 md_update_sb(mddev, 1); 6635 return rv; 6636 err: 6637 return rv; 6638 } 6639 6640 static int set_disk_faulty(struct mddev *mddev, dev_t dev) 6641 { 6642 struct md_rdev *rdev; 6643 int err = 0; 6644 6645 if (mddev->pers == NULL) 6646 return -ENODEV; 6647 6648 rcu_read_lock(); 6649 rdev = find_rdev_rcu(mddev, dev); 6650 if (!rdev) 6651 err = -ENODEV; 6652 else { 6653 md_error(mddev, rdev); 6654 if (!test_bit(Faulty, &rdev->flags)) 6655 err = -EBUSY; 6656 } 6657 rcu_read_unlock(); 6658 return err; 6659 } 6660 6661 /* 6662 * We have a problem here : there is no easy way to give a CHS 6663 * virtual geometry. We currently pretend that we have a 2 heads 6664 * 4 sectors (with a BIG number of cylinders...). This drives 6665 * dosfs just mad... ;-) 6666 */ 6667 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) 6668 { 6669 struct mddev *mddev = bdev->bd_disk->private_data; 6670 6671 geo->heads = 2; 6672 geo->sectors = 4; 6673 geo->cylinders = mddev->array_sectors / 8; 6674 return 0; 6675 } 6676 6677 static inline bool md_ioctl_valid(unsigned int cmd) 6678 { 6679 switch (cmd) { 6680 case ADD_NEW_DISK: 6681 case BLKROSET: 6682 case GET_ARRAY_INFO: 6683 case GET_BITMAP_FILE: 6684 case GET_DISK_INFO: 6685 case HOT_ADD_DISK: 6686 case HOT_REMOVE_DISK: 6687 case RAID_AUTORUN: 6688 case RAID_VERSION: 6689 case RESTART_ARRAY_RW: 6690 case RUN_ARRAY: 6691 case SET_ARRAY_INFO: 6692 case SET_BITMAP_FILE: 6693 case SET_DISK_FAULTY: 6694 case STOP_ARRAY: 6695 case STOP_ARRAY_RO: 6696 case CLUSTERED_DISK_NACK: 6697 return true; 6698 default: 6699 return false; 6700 } 6701 } 6702 6703 static int md_ioctl(struct block_device *bdev, fmode_t mode, 6704 unsigned int cmd, unsigned long arg) 6705 { 6706 int err = 0; 6707 void __user *argp = (void __user *)arg; 6708 struct mddev *mddev = NULL; 6709 int ro; 6710 6711 if (!md_ioctl_valid(cmd)) 6712 return -ENOTTY; 6713 6714 switch (cmd) { 6715 case RAID_VERSION: 6716 case GET_ARRAY_INFO: 6717 case GET_DISK_INFO: 6718 break; 6719 default: 6720 if (!capable(CAP_SYS_ADMIN)) 6721 return -EACCES; 6722 } 6723 6724 /* 6725 * Commands dealing with the RAID driver but not any 6726 * particular array: 6727 */ 6728 switch (cmd) { 6729 case RAID_VERSION: 6730 err = get_version(argp); 6731 goto out; 6732 6733 #ifndef MODULE 6734 case RAID_AUTORUN: 6735 err = 0; 6736 autostart_arrays(arg); 6737 goto out; 6738 #endif 6739 default:; 6740 } 6741 6742 /* 6743 * Commands creating/starting a new array: 6744 */ 6745 6746 mddev = bdev->bd_disk->private_data; 6747 6748 if (!mddev) { 6749 BUG(); 6750 goto out; 6751 } 6752 6753 /* Some actions do not requires the mutex */ 6754 switch (cmd) { 6755 case GET_ARRAY_INFO: 6756 if (!mddev->raid_disks && !mddev->external) 6757 err = -ENODEV; 6758 else 6759 err = get_array_info(mddev, argp); 6760 goto out; 6761 6762 case GET_DISK_INFO: 6763 if (!mddev->raid_disks && !mddev->external) 6764 err = -ENODEV; 6765 else 6766 err = get_disk_info(mddev, argp); 6767 goto out; 6768 6769 case SET_DISK_FAULTY: 6770 err = set_disk_faulty(mddev, new_decode_dev(arg)); 6771 goto out; 6772 6773 case GET_BITMAP_FILE: 6774 err = get_bitmap_file(mddev, argp); 6775 goto out; 6776 6777 } 6778 6779 if (cmd == ADD_NEW_DISK) 6780 /* need to ensure md_delayed_delete() has completed */ 6781 flush_workqueue(md_misc_wq); 6782 6783 if (cmd == HOT_REMOVE_DISK) 6784 /* need to ensure recovery thread has run */ 6785 wait_event_interruptible_timeout(mddev->sb_wait, 6786 !test_bit(MD_RECOVERY_NEEDED, 6787 &mddev->flags), 6788 msecs_to_jiffies(5000)); 6789 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { 6790 /* Need to flush page cache, and ensure no-one else opens 6791 * and writes 6792 */ 6793 mutex_lock(&mddev->open_mutex); 6794 if (mddev->pers && atomic_read(&mddev->openers) > 1) { 6795 mutex_unlock(&mddev->open_mutex); 6796 err = -EBUSY; 6797 goto out; 6798 } 6799 set_bit(MD_STILL_CLOSED, &mddev->flags); 6800 mutex_unlock(&mddev->open_mutex); 6801 sync_blockdev(bdev); 6802 } 6803 err = mddev_lock(mddev); 6804 if (err) { 6805 printk(KERN_INFO 6806 "md: ioctl lock interrupted, reason %d, cmd %d\n", 6807 err, cmd); 6808 goto out; 6809 } 6810 6811 if (cmd == SET_ARRAY_INFO) { 6812 mdu_array_info_t info; 6813 if (!arg) 6814 memset(&info, 0, sizeof(info)); 6815 else if (copy_from_user(&info, argp, sizeof(info))) { 6816 err = -EFAULT; 6817 goto unlock; 6818 } 6819 if (mddev->pers) { 6820 err = update_array_info(mddev, &info); 6821 if (err) { 6822 printk(KERN_WARNING "md: couldn't update" 6823 " array info. %d\n", err); 6824 goto unlock; 6825 } 6826 goto unlock; 6827 } 6828 if (!list_empty(&mddev->disks)) { 6829 printk(KERN_WARNING 6830 "md: array %s already has disks!\n", 6831 mdname(mddev)); 6832 err = -EBUSY; 6833 goto unlock; 6834 } 6835 if (mddev->raid_disks) { 6836 printk(KERN_WARNING 6837 "md: array %s already initialised!\n", 6838 mdname(mddev)); 6839 err = -EBUSY; 6840 goto unlock; 6841 } 6842 err = set_array_info(mddev, &info); 6843 if (err) { 6844 printk(KERN_WARNING "md: couldn't set" 6845 " array info. %d\n", err); 6846 goto unlock; 6847 } 6848 goto unlock; 6849 } 6850 6851 /* 6852 * Commands querying/configuring an existing array: 6853 */ 6854 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 6855 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ 6856 if ((!mddev->raid_disks && !mddev->external) 6857 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 6858 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE 6859 && cmd != GET_BITMAP_FILE) { 6860 err = -ENODEV; 6861 goto unlock; 6862 } 6863 6864 /* 6865 * Commands even a read-only array can execute: 6866 */ 6867 switch (cmd) { 6868 case RESTART_ARRAY_RW: 6869 err = restart_array(mddev); 6870 goto unlock; 6871 6872 case STOP_ARRAY: 6873 err = do_md_stop(mddev, 0, bdev); 6874 goto unlock; 6875 6876 case STOP_ARRAY_RO: 6877 err = md_set_readonly(mddev, bdev); 6878 goto unlock; 6879 6880 case HOT_REMOVE_DISK: 6881 err = hot_remove_disk(mddev, new_decode_dev(arg)); 6882 goto unlock; 6883 6884 case ADD_NEW_DISK: 6885 /* We can support ADD_NEW_DISK on read-only arrays 6886 * on if we are re-adding a preexisting device. 6887 * So require mddev->pers and MD_DISK_SYNC. 6888 */ 6889 if (mddev->pers) { 6890 mdu_disk_info_t info; 6891 if (copy_from_user(&info, argp, sizeof(info))) 6892 err = -EFAULT; 6893 else if (!(info.state & (1<<MD_DISK_SYNC))) 6894 /* Need to clear read-only for this */ 6895 break; 6896 else 6897 err = add_new_disk(mddev, &info); 6898 goto unlock; 6899 } 6900 break; 6901 6902 case BLKROSET: 6903 if (get_user(ro, (int __user *)(arg))) { 6904 err = -EFAULT; 6905 goto unlock; 6906 } 6907 err = -EINVAL; 6908 6909 /* if the bdev is going readonly the value of mddev->ro 6910 * does not matter, no writes are coming 6911 */ 6912 if (ro) 6913 goto unlock; 6914 6915 /* are we are already prepared for writes? */ 6916 if (mddev->ro != 1) 6917 goto unlock; 6918 6919 /* transitioning to readauto need only happen for 6920 * arrays that call md_write_start 6921 */ 6922 if (mddev->pers) { 6923 err = restart_array(mddev); 6924 if (err == 0) { 6925 mddev->ro = 2; 6926 set_disk_ro(mddev->gendisk, 0); 6927 } 6928 } 6929 goto unlock; 6930 } 6931 6932 /* 6933 * The remaining ioctls are changing the state of the 6934 * superblock, so we do not allow them on read-only arrays. 6935 */ 6936 if (mddev->ro && mddev->pers) { 6937 if (mddev->ro == 2) { 6938 mddev->ro = 0; 6939 sysfs_notify_dirent_safe(mddev->sysfs_state); 6940 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6941 /* mddev_unlock will wake thread */ 6942 /* If a device failed while we were read-only, we 6943 * need to make sure the metadata is updated now. 6944 */ 6945 if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { 6946 mddev_unlock(mddev); 6947 wait_event(mddev->sb_wait, 6948 !test_bit(MD_CHANGE_DEVS, &mddev->flags) && 6949 !test_bit(MD_CHANGE_PENDING, &mddev->flags)); 6950 mddev_lock_nointr(mddev); 6951 } 6952 } else { 6953 err = -EROFS; 6954 goto unlock; 6955 } 6956 } 6957 6958 switch (cmd) { 6959 case ADD_NEW_DISK: 6960 { 6961 mdu_disk_info_t info; 6962 if (copy_from_user(&info, argp, sizeof(info))) 6963 err = -EFAULT; 6964 else 6965 err = add_new_disk(mddev, &info); 6966 goto unlock; 6967 } 6968 6969 case CLUSTERED_DISK_NACK: 6970 if (mddev_is_clustered(mddev)) 6971 md_cluster_ops->new_disk_ack(mddev, false); 6972 else 6973 err = -EINVAL; 6974 goto unlock; 6975 6976 case HOT_ADD_DISK: 6977 err = hot_add_disk(mddev, new_decode_dev(arg)); 6978 goto unlock; 6979 6980 case RUN_ARRAY: 6981 err = do_md_run(mddev); 6982 goto unlock; 6983 6984 case SET_BITMAP_FILE: 6985 err = set_bitmap_file(mddev, (int)arg); 6986 goto unlock; 6987 6988 default: 6989 err = -EINVAL; 6990 goto unlock; 6991 } 6992 6993 unlock: 6994 if (mddev->hold_active == UNTIL_IOCTL && 6995 err != -EINVAL) 6996 mddev->hold_active = 0; 6997 mddev_unlock(mddev); 6998 out: 6999 return err; 7000 } 7001 #ifdef CONFIG_COMPAT 7002 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, 7003 unsigned int cmd, unsigned long arg) 7004 { 7005 switch (cmd) { 7006 case HOT_REMOVE_DISK: 7007 case HOT_ADD_DISK: 7008 case SET_DISK_FAULTY: 7009 case SET_BITMAP_FILE: 7010 /* These take in integer arg, do not convert */ 7011 break; 7012 default: 7013 arg = (unsigned long)compat_ptr(arg); 7014 break; 7015 } 7016 7017 return md_ioctl(bdev, mode, cmd, arg); 7018 } 7019 #endif /* CONFIG_COMPAT */ 7020 7021 static int md_open(struct block_device *bdev, fmode_t mode) 7022 { 7023 /* 7024 * Succeed if we can lock the mddev, which confirms that 7025 * it isn't being stopped right now. 7026 */ 7027 struct mddev *mddev = mddev_find(bdev->bd_dev); 7028 int err; 7029 7030 if (!mddev) 7031 return -ENODEV; 7032 7033 if (mddev->gendisk != bdev->bd_disk) { 7034 /* we are racing with mddev_put which is discarding this 7035 * bd_disk. 7036 */ 7037 mddev_put(mddev); 7038 /* Wait until bdev->bd_disk is definitely gone */ 7039 flush_workqueue(md_misc_wq); 7040 /* Then retry the open from the top */ 7041 return -ERESTARTSYS; 7042 } 7043 BUG_ON(mddev != bdev->bd_disk->private_data); 7044 7045 if ((err = mutex_lock_interruptible(&mddev->open_mutex))) 7046 goto out; 7047 7048 err = 0; 7049 atomic_inc(&mddev->openers); 7050 clear_bit(MD_STILL_CLOSED, &mddev->flags); 7051 mutex_unlock(&mddev->open_mutex); 7052 7053 check_disk_change(bdev); 7054 out: 7055 return err; 7056 } 7057 7058 static void md_release(struct gendisk *disk, fmode_t mode) 7059 { 7060 struct mddev *mddev = disk->private_data; 7061 7062 BUG_ON(!mddev); 7063 atomic_dec(&mddev->openers); 7064 mddev_put(mddev); 7065 } 7066 7067 static int md_media_changed(struct gendisk *disk) 7068 { 7069 struct mddev *mddev = disk->private_data; 7070 7071 return mddev->changed; 7072 } 7073 7074 static int md_revalidate(struct gendisk *disk) 7075 { 7076 struct mddev *mddev = disk->private_data; 7077 7078 mddev->changed = 0; 7079 return 0; 7080 } 7081 static const struct block_device_operations md_fops = 7082 { 7083 .owner = THIS_MODULE, 7084 .open = md_open, 7085 .release = md_release, 7086 .ioctl = md_ioctl, 7087 #ifdef CONFIG_COMPAT 7088 .compat_ioctl = md_compat_ioctl, 7089 #endif 7090 .getgeo = md_getgeo, 7091 .media_changed = md_media_changed, 7092 .revalidate_disk= md_revalidate, 7093 }; 7094 7095 static int md_thread(void *arg) 7096 { 7097 struct md_thread *thread = arg; 7098 7099 /* 7100 * md_thread is a 'system-thread', it's priority should be very 7101 * high. We avoid resource deadlocks individually in each 7102 * raid personality. (RAID5 does preallocation) We also use RR and 7103 * the very same RT priority as kswapd, thus we will never get 7104 * into a priority inversion deadlock. 7105 * 7106 * we definitely have to have equal or higher priority than 7107 * bdflush, otherwise bdflush will deadlock if there are too 7108 * many dirty RAID5 blocks. 7109 */ 7110 7111 allow_signal(SIGKILL); 7112 while (!kthread_should_stop()) { 7113 7114 /* We need to wait INTERRUPTIBLE so that 7115 * we don't add to the load-average. 7116 * That means we need to be sure no signals are 7117 * pending 7118 */ 7119 if (signal_pending(current)) 7120 flush_signals(current); 7121 7122 wait_event_interruptible_timeout 7123 (thread->wqueue, 7124 test_bit(THREAD_WAKEUP, &thread->flags) 7125 || kthread_should_stop(), 7126 thread->timeout); 7127 7128 clear_bit(THREAD_WAKEUP, &thread->flags); 7129 if (!kthread_should_stop()) 7130 thread->run(thread); 7131 } 7132 7133 return 0; 7134 } 7135 7136 void md_wakeup_thread(struct md_thread *thread) 7137 { 7138 if (thread) { 7139 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); 7140 set_bit(THREAD_WAKEUP, &thread->flags); 7141 wake_up(&thread->wqueue); 7142 } 7143 } 7144 EXPORT_SYMBOL(md_wakeup_thread); 7145 7146 struct md_thread *md_register_thread(void (*run) (struct md_thread *), 7147 struct mddev *mddev, const char *name) 7148 { 7149 struct md_thread *thread; 7150 7151 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); 7152 if (!thread) 7153 return NULL; 7154 7155 init_waitqueue_head(&thread->wqueue); 7156 7157 thread->run = run; 7158 thread->mddev = mddev; 7159 thread->timeout = MAX_SCHEDULE_TIMEOUT; 7160 thread->tsk = kthread_run(md_thread, thread, 7161 "%s_%s", 7162 mdname(thread->mddev), 7163 name); 7164 if (IS_ERR(thread->tsk)) { 7165 kfree(thread); 7166 return NULL; 7167 } 7168 return thread; 7169 } 7170 EXPORT_SYMBOL(md_register_thread); 7171 7172 void md_unregister_thread(struct md_thread **threadp) 7173 { 7174 struct md_thread *thread = *threadp; 7175 if (!thread) 7176 return; 7177 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); 7178 /* Locking ensures that mddev_unlock does not wake_up a 7179 * non-existent thread 7180 */ 7181 spin_lock(&pers_lock); 7182 *threadp = NULL; 7183 spin_unlock(&pers_lock); 7184 7185 kthread_stop(thread->tsk); 7186 kfree(thread); 7187 } 7188 EXPORT_SYMBOL(md_unregister_thread); 7189 7190 void md_error(struct mddev *mddev, struct md_rdev *rdev) 7191 { 7192 if (!rdev || test_bit(Faulty, &rdev->flags)) 7193 return; 7194 7195 if (!mddev->pers || !mddev->pers->error_handler) 7196 return; 7197 mddev->pers->error_handler(mddev,rdev); 7198 if (mddev->degraded) 7199 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7200 sysfs_notify_dirent_safe(rdev->sysfs_state); 7201 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7202 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7203 md_wakeup_thread(mddev->thread); 7204 if (mddev->event_work.func) 7205 queue_work(md_misc_wq, &mddev->event_work); 7206 md_new_event(mddev); 7207 } 7208 EXPORT_SYMBOL(md_error); 7209 7210 /* seq_file implementation /proc/mdstat */ 7211 7212 static void status_unused(struct seq_file *seq) 7213 { 7214 int i = 0; 7215 struct md_rdev *rdev; 7216 7217 seq_printf(seq, "unused devices: "); 7218 7219 list_for_each_entry(rdev, &pending_raid_disks, same_set) { 7220 char b[BDEVNAME_SIZE]; 7221 i++; 7222 seq_printf(seq, "%s ", 7223 bdevname(rdev->bdev,b)); 7224 } 7225 if (!i) 7226 seq_printf(seq, "<none>"); 7227 7228 seq_printf(seq, "\n"); 7229 } 7230 7231 static int status_resync(struct seq_file *seq, struct mddev *mddev) 7232 { 7233 sector_t max_sectors, resync, res; 7234 unsigned long dt, db; 7235 sector_t rt; 7236 int scale; 7237 unsigned int per_milli; 7238 7239 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 7240 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7241 max_sectors = mddev->resync_max_sectors; 7242 else 7243 max_sectors = mddev->dev_sectors; 7244 7245 resync = mddev->curr_resync; 7246 if (resync <= 3) { 7247 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 7248 /* Still cleaning up */ 7249 resync = max_sectors; 7250 } else 7251 resync -= atomic_read(&mddev->recovery_active); 7252 7253 if (resync == 0) { 7254 if (mddev->recovery_cp < MaxSector) { 7255 seq_printf(seq, "\tresync=PENDING"); 7256 return 1; 7257 } 7258 return 0; 7259 } 7260 if (resync < 3) { 7261 seq_printf(seq, "\tresync=DELAYED"); 7262 return 1; 7263 } 7264 7265 WARN_ON(max_sectors == 0); 7266 /* Pick 'scale' such that (resync>>scale)*1000 will fit 7267 * in a sector_t, and (max_sectors>>scale) will fit in a 7268 * u32, as those are the requirements for sector_div. 7269 * Thus 'scale' must be at least 10 7270 */ 7271 scale = 10; 7272 if (sizeof(sector_t) > sizeof(unsigned long)) { 7273 while ( max_sectors/2 > (1ULL<<(scale+32))) 7274 scale++; 7275 } 7276 res = (resync>>scale)*1000; 7277 sector_div(res, (u32)((max_sectors>>scale)+1)); 7278 7279 per_milli = res; 7280 { 7281 int i, x = per_milli/50, y = 20-x; 7282 seq_printf(seq, "["); 7283 for (i = 0; i < x; i++) 7284 seq_printf(seq, "="); 7285 seq_printf(seq, ">"); 7286 for (i = 0; i < y; i++) 7287 seq_printf(seq, "."); 7288 seq_printf(seq, "] "); 7289 } 7290 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", 7291 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? 7292 "reshape" : 7293 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? 7294 "check" : 7295 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 7296 "resync" : "recovery"))), 7297 per_milli/10, per_milli % 10, 7298 (unsigned long long) resync/2, 7299 (unsigned long long) max_sectors/2); 7300 7301 /* 7302 * dt: time from mark until now 7303 * db: blocks written from mark until now 7304 * rt: remaining time 7305 * 7306 * rt is a sector_t, so could be 32bit or 64bit. 7307 * So we divide before multiply in case it is 32bit and close 7308 * to the limit. 7309 * We scale the divisor (db) by 32 to avoid losing precision 7310 * near the end of resync when the number of remaining sectors 7311 * is close to 'db'. 7312 * We then divide rt by 32 after multiplying by db to compensate. 7313 * The '+1' avoids division by zero if db is very small. 7314 */ 7315 dt = ((jiffies - mddev->resync_mark) / HZ); 7316 if (!dt) dt++; 7317 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) 7318 - mddev->resync_mark_cnt; 7319 7320 rt = max_sectors - resync; /* number of remaining sectors */ 7321 sector_div(rt, db/32+1); 7322 rt *= dt; 7323 rt >>= 5; 7324 7325 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, 7326 ((unsigned long)rt % 60)/6); 7327 7328 seq_printf(seq, " speed=%ldK/sec", db/2/dt); 7329 return 1; 7330 } 7331 7332 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 7333 { 7334 struct list_head *tmp; 7335 loff_t l = *pos; 7336 struct mddev *mddev; 7337 7338 if (l >= 0x10000) 7339 return NULL; 7340 if (!l--) 7341 /* header */ 7342 return (void*)1; 7343 7344 spin_lock(&all_mddevs_lock); 7345 list_for_each(tmp,&all_mddevs) 7346 if (!l--) { 7347 mddev = list_entry(tmp, struct mddev, all_mddevs); 7348 mddev_get(mddev); 7349 spin_unlock(&all_mddevs_lock); 7350 return mddev; 7351 } 7352 spin_unlock(&all_mddevs_lock); 7353 if (!l--) 7354 return (void*)2;/* tail */ 7355 return NULL; 7356 } 7357 7358 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 7359 { 7360 struct list_head *tmp; 7361 struct mddev *next_mddev, *mddev = v; 7362 7363 ++*pos; 7364 if (v == (void*)2) 7365 return NULL; 7366 7367 spin_lock(&all_mddevs_lock); 7368 if (v == (void*)1) 7369 tmp = all_mddevs.next; 7370 else 7371 tmp = mddev->all_mddevs.next; 7372 if (tmp != &all_mddevs) 7373 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); 7374 else { 7375 next_mddev = (void*)2; 7376 *pos = 0x10000; 7377 } 7378 spin_unlock(&all_mddevs_lock); 7379 7380 if (v != (void*)1) 7381 mddev_put(mddev); 7382 return next_mddev; 7383 7384 } 7385 7386 static void md_seq_stop(struct seq_file *seq, void *v) 7387 { 7388 struct mddev *mddev = v; 7389 7390 if (mddev && v != (void*)1 && v != (void*)2) 7391 mddev_put(mddev); 7392 } 7393 7394 static int md_seq_show(struct seq_file *seq, void *v) 7395 { 7396 struct mddev *mddev = v; 7397 sector_t sectors; 7398 struct md_rdev *rdev; 7399 7400 if (v == (void*)1) { 7401 struct md_personality *pers; 7402 seq_printf(seq, "Personalities : "); 7403 spin_lock(&pers_lock); 7404 list_for_each_entry(pers, &pers_list, list) 7405 seq_printf(seq, "[%s] ", pers->name); 7406 7407 spin_unlock(&pers_lock); 7408 seq_printf(seq, "\n"); 7409 seq->poll_event = atomic_read(&md_event_count); 7410 return 0; 7411 } 7412 if (v == (void*)2) { 7413 status_unused(seq); 7414 return 0; 7415 } 7416 7417 spin_lock(&mddev->lock); 7418 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 7419 seq_printf(seq, "%s : %sactive", mdname(mddev), 7420 mddev->pers ? "" : "in"); 7421 if (mddev->pers) { 7422 if (mddev->ro==1) 7423 seq_printf(seq, " (read-only)"); 7424 if (mddev->ro==2) 7425 seq_printf(seq, " (auto-read-only)"); 7426 seq_printf(seq, " %s", mddev->pers->name); 7427 } 7428 7429 sectors = 0; 7430 rcu_read_lock(); 7431 rdev_for_each_rcu(rdev, mddev) { 7432 char b[BDEVNAME_SIZE]; 7433 seq_printf(seq, " %s[%d]", 7434 bdevname(rdev->bdev,b), rdev->desc_nr); 7435 if (test_bit(WriteMostly, &rdev->flags)) 7436 seq_printf(seq, "(W)"); 7437 if (test_bit(Journal, &rdev->flags)) 7438 seq_printf(seq, "(J)"); 7439 if (test_bit(Faulty, &rdev->flags)) { 7440 seq_printf(seq, "(F)"); 7441 continue; 7442 } 7443 if (rdev->raid_disk < 0) 7444 seq_printf(seq, "(S)"); /* spare */ 7445 if (test_bit(Replacement, &rdev->flags)) 7446 seq_printf(seq, "(R)"); 7447 sectors += rdev->sectors; 7448 } 7449 rcu_read_unlock(); 7450 7451 if (!list_empty(&mddev->disks)) { 7452 if (mddev->pers) 7453 seq_printf(seq, "\n %llu blocks", 7454 (unsigned long long) 7455 mddev->array_sectors / 2); 7456 else 7457 seq_printf(seq, "\n %llu blocks", 7458 (unsigned long long)sectors / 2); 7459 } 7460 if (mddev->persistent) { 7461 if (mddev->major_version != 0 || 7462 mddev->minor_version != 90) { 7463 seq_printf(seq," super %d.%d", 7464 mddev->major_version, 7465 mddev->minor_version); 7466 } 7467 } else if (mddev->external) 7468 seq_printf(seq, " super external:%s", 7469 mddev->metadata_type); 7470 else 7471 seq_printf(seq, " super non-persistent"); 7472 7473 if (mddev->pers) { 7474 mddev->pers->status(seq, mddev); 7475 seq_printf(seq, "\n "); 7476 if (mddev->pers->sync_request) { 7477 if (status_resync(seq, mddev)) 7478 seq_printf(seq, "\n "); 7479 } 7480 } else 7481 seq_printf(seq, "\n "); 7482 7483 bitmap_status(seq, mddev->bitmap); 7484 7485 seq_printf(seq, "\n"); 7486 } 7487 spin_unlock(&mddev->lock); 7488 7489 return 0; 7490 } 7491 7492 static const struct seq_operations md_seq_ops = { 7493 .start = md_seq_start, 7494 .next = md_seq_next, 7495 .stop = md_seq_stop, 7496 .show = md_seq_show, 7497 }; 7498 7499 static int md_seq_open(struct inode *inode, struct file *file) 7500 { 7501 struct seq_file *seq; 7502 int error; 7503 7504 error = seq_open(file, &md_seq_ops); 7505 if (error) 7506 return error; 7507 7508 seq = file->private_data; 7509 seq->poll_event = atomic_read(&md_event_count); 7510 return error; 7511 } 7512 7513 static int md_unloading; 7514 static unsigned int mdstat_poll(struct file *filp, poll_table *wait) 7515 { 7516 struct seq_file *seq = filp->private_data; 7517 int mask; 7518 7519 if (md_unloading) 7520 return POLLIN|POLLRDNORM|POLLERR|POLLPRI; 7521 poll_wait(filp, &md_event_waiters, wait); 7522 7523 /* always allow read */ 7524 mask = POLLIN | POLLRDNORM; 7525 7526 if (seq->poll_event != atomic_read(&md_event_count)) 7527 mask |= POLLERR | POLLPRI; 7528 return mask; 7529 } 7530 7531 static const struct file_operations md_seq_fops = { 7532 .owner = THIS_MODULE, 7533 .open = md_seq_open, 7534 .read = seq_read, 7535 .llseek = seq_lseek, 7536 .release = seq_release_private, 7537 .poll = mdstat_poll, 7538 }; 7539 7540 int register_md_personality(struct md_personality *p) 7541 { 7542 printk(KERN_INFO "md: %s personality registered for level %d\n", 7543 p->name, p->level); 7544 spin_lock(&pers_lock); 7545 list_add_tail(&p->list, &pers_list); 7546 spin_unlock(&pers_lock); 7547 return 0; 7548 } 7549 EXPORT_SYMBOL(register_md_personality); 7550 7551 int unregister_md_personality(struct md_personality *p) 7552 { 7553 printk(KERN_INFO "md: %s personality unregistered\n", p->name); 7554 spin_lock(&pers_lock); 7555 list_del_init(&p->list); 7556 spin_unlock(&pers_lock); 7557 return 0; 7558 } 7559 EXPORT_SYMBOL(unregister_md_personality); 7560 7561 int register_md_cluster_operations(struct md_cluster_operations *ops, 7562 struct module *module) 7563 { 7564 int ret = 0; 7565 spin_lock(&pers_lock); 7566 if (md_cluster_ops != NULL) 7567 ret = -EALREADY; 7568 else { 7569 md_cluster_ops = ops; 7570 md_cluster_mod = module; 7571 } 7572 spin_unlock(&pers_lock); 7573 return ret; 7574 } 7575 EXPORT_SYMBOL(register_md_cluster_operations); 7576 7577 int unregister_md_cluster_operations(void) 7578 { 7579 spin_lock(&pers_lock); 7580 md_cluster_ops = NULL; 7581 spin_unlock(&pers_lock); 7582 return 0; 7583 } 7584 EXPORT_SYMBOL(unregister_md_cluster_operations); 7585 7586 int md_setup_cluster(struct mddev *mddev, int nodes) 7587 { 7588 int err; 7589 7590 err = request_module("md-cluster"); 7591 if (err) { 7592 pr_err("md-cluster module not found.\n"); 7593 return -ENOENT; 7594 } 7595 7596 spin_lock(&pers_lock); 7597 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { 7598 spin_unlock(&pers_lock); 7599 return -ENOENT; 7600 } 7601 spin_unlock(&pers_lock); 7602 7603 return md_cluster_ops->join(mddev, nodes); 7604 } 7605 7606 void md_cluster_stop(struct mddev *mddev) 7607 { 7608 if (!md_cluster_ops) 7609 return; 7610 md_cluster_ops->leave(mddev); 7611 module_put(md_cluster_mod); 7612 } 7613 7614 static int is_mddev_idle(struct mddev *mddev, int init) 7615 { 7616 struct md_rdev *rdev; 7617 int idle; 7618 int curr_events; 7619 7620 idle = 1; 7621 rcu_read_lock(); 7622 rdev_for_each_rcu(rdev, mddev) { 7623 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 7624 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 7625 (int)part_stat_read(&disk->part0, sectors[1]) - 7626 atomic_read(&disk->sync_io); 7627 /* sync IO will cause sync_io to increase before the disk_stats 7628 * as sync_io is counted when a request starts, and 7629 * disk_stats is counted when it completes. 7630 * So resync activity will cause curr_events to be smaller than 7631 * when there was no such activity. 7632 * non-sync IO will cause disk_stat to increase without 7633 * increasing sync_io so curr_events will (eventually) 7634 * be larger than it was before. Once it becomes 7635 * substantially larger, the test below will cause 7636 * the array to appear non-idle, and resync will slow 7637 * down. 7638 * If there is a lot of outstanding resync activity when 7639 * we set last_event to curr_events, then all that activity 7640 * completing might cause the array to appear non-idle 7641 * and resync will be slowed down even though there might 7642 * not have been non-resync activity. This will only 7643 * happen once though. 'last_events' will soon reflect 7644 * the state where there is little or no outstanding 7645 * resync requests, and further resync activity will 7646 * always make curr_events less than last_events. 7647 * 7648 */ 7649 if (init || curr_events - rdev->last_events > 64) { 7650 rdev->last_events = curr_events; 7651 idle = 0; 7652 } 7653 } 7654 rcu_read_unlock(); 7655 return idle; 7656 } 7657 7658 void md_done_sync(struct mddev *mddev, int blocks, int ok) 7659 { 7660 /* another "blocks" (512byte) blocks have been synced */ 7661 atomic_sub(blocks, &mddev->recovery_active); 7662 wake_up(&mddev->recovery_wait); 7663 if (!ok) { 7664 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7665 set_bit(MD_RECOVERY_ERROR, &mddev->recovery); 7666 md_wakeup_thread(mddev->thread); 7667 // stop recovery, signal do_sync .... 7668 } 7669 } 7670 EXPORT_SYMBOL(md_done_sync); 7671 7672 /* md_write_start(mddev, bi) 7673 * If we need to update some array metadata (e.g. 'active' flag 7674 * in superblock) before writing, schedule a superblock update 7675 * and wait for it to complete. 7676 */ 7677 void md_write_start(struct mddev *mddev, struct bio *bi) 7678 { 7679 int did_change = 0; 7680 if (bio_data_dir(bi) != WRITE) 7681 return; 7682 7683 BUG_ON(mddev->ro == 1); 7684 if (mddev->ro == 2) { 7685 /* need to switch to read/write */ 7686 mddev->ro = 0; 7687 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7688 md_wakeup_thread(mddev->thread); 7689 md_wakeup_thread(mddev->sync_thread); 7690 did_change = 1; 7691 } 7692 atomic_inc(&mddev->writes_pending); 7693 if (mddev->safemode == 1) 7694 mddev->safemode = 0; 7695 if (mddev->in_sync) { 7696 spin_lock(&mddev->lock); 7697 if (mddev->in_sync) { 7698 mddev->in_sync = 0; 7699 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7700 set_bit(MD_CHANGE_PENDING, &mddev->flags); 7701 md_wakeup_thread(mddev->thread); 7702 did_change = 1; 7703 } 7704 spin_unlock(&mddev->lock); 7705 } 7706 if (did_change) 7707 sysfs_notify_dirent_safe(mddev->sysfs_state); 7708 wait_event(mddev->sb_wait, 7709 !test_bit(MD_CHANGE_PENDING, &mddev->flags)); 7710 } 7711 EXPORT_SYMBOL(md_write_start); 7712 7713 void md_write_end(struct mddev *mddev) 7714 { 7715 if (atomic_dec_and_test(&mddev->writes_pending)) { 7716 if (mddev->safemode == 2) 7717 md_wakeup_thread(mddev->thread); 7718 else if (mddev->safemode_delay) 7719 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 7720 } 7721 } 7722 EXPORT_SYMBOL(md_write_end); 7723 7724 /* md_allow_write(mddev) 7725 * Calling this ensures that the array is marked 'active' so that writes 7726 * may proceed without blocking. It is important to call this before 7727 * attempting a GFP_KERNEL allocation while holding the mddev lock. 7728 * Must be called with mddev_lock held. 7729 * 7730 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock 7731 * is dropped, so return -EAGAIN after notifying userspace. 7732 */ 7733 int md_allow_write(struct mddev *mddev) 7734 { 7735 if (!mddev->pers) 7736 return 0; 7737 if (mddev->ro) 7738 return 0; 7739 if (!mddev->pers->sync_request) 7740 return 0; 7741 7742 spin_lock(&mddev->lock); 7743 if (mddev->in_sync) { 7744 mddev->in_sync = 0; 7745 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7746 set_bit(MD_CHANGE_PENDING, &mddev->flags); 7747 if (mddev->safemode_delay && 7748 mddev->safemode == 0) 7749 mddev->safemode = 1; 7750 spin_unlock(&mddev->lock); 7751 md_update_sb(mddev, 0); 7752 sysfs_notify_dirent_safe(mddev->sysfs_state); 7753 } else 7754 spin_unlock(&mddev->lock); 7755 7756 if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) 7757 return -EAGAIN; 7758 else 7759 return 0; 7760 } 7761 EXPORT_SYMBOL_GPL(md_allow_write); 7762 7763 #define SYNC_MARKS 10 7764 #define SYNC_MARK_STEP (3*HZ) 7765 #define UPDATE_FREQUENCY (5*60*HZ) 7766 void md_do_sync(struct md_thread *thread) 7767 { 7768 struct mddev *mddev = thread->mddev; 7769 struct mddev *mddev2; 7770 unsigned int currspeed = 0, 7771 window; 7772 sector_t max_sectors,j, io_sectors, recovery_done; 7773 unsigned long mark[SYNC_MARKS]; 7774 unsigned long update_time; 7775 sector_t mark_cnt[SYNC_MARKS]; 7776 int last_mark,m; 7777 struct list_head *tmp; 7778 sector_t last_check; 7779 int skipped = 0; 7780 struct md_rdev *rdev; 7781 char *desc, *action = NULL; 7782 struct blk_plug plug; 7783 bool cluster_resync_finished = false; 7784 7785 /* just incase thread restarts... */ 7786 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 7787 return; 7788 if (mddev->ro) {/* never try to sync a read-only array */ 7789 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7790 return; 7791 } 7792 7793 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7794 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 7795 desc = "data-check"; 7796 action = "check"; 7797 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 7798 desc = "requested-resync"; 7799 action = "repair"; 7800 } else 7801 desc = "resync"; 7802 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7803 desc = "reshape"; 7804 else 7805 desc = "recovery"; 7806 7807 mddev->last_sync_action = action ?: desc; 7808 7809 /* we overload curr_resync somewhat here. 7810 * 0 == not engaged in resync at all 7811 * 2 == checking that there is no conflict with another sync 7812 * 1 == like 2, but have yielded to allow conflicting resync to 7813 * commense 7814 * other == active in resync - this many blocks 7815 * 7816 * Before starting a resync we must have set curr_resync to 7817 * 2, and then checked that every "conflicting" array has curr_resync 7818 * less than ours. When we find one that is the same or higher 7819 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 7820 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 7821 * This will mean we have to start checking from the beginning again. 7822 * 7823 */ 7824 7825 do { 7826 mddev->curr_resync = 2; 7827 7828 try_again: 7829 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7830 goto skip; 7831 for_each_mddev(mddev2, tmp) { 7832 if (mddev2 == mddev) 7833 continue; 7834 if (!mddev->parallel_resync 7835 && mddev2->curr_resync 7836 && match_mddev_units(mddev, mddev2)) { 7837 DEFINE_WAIT(wq); 7838 if (mddev < mddev2 && mddev->curr_resync == 2) { 7839 /* arbitrarily yield */ 7840 mddev->curr_resync = 1; 7841 wake_up(&resync_wait); 7842 } 7843 if (mddev > mddev2 && mddev->curr_resync == 1) 7844 /* no need to wait here, we can wait the next 7845 * time 'round when curr_resync == 2 7846 */ 7847 continue; 7848 /* We need to wait 'interruptible' so as not to 7849 * contribute to the load average, and not to 7850 * be caught by 'softlockup' 7851 */ 7852 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); 7853 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 7854 mddev2->curr_resync >= mddev->curr_resync) { 7855 printk(KERN_INFO "md: delaying %s of %s" 7856 " until %s has finished (they" 7857 " share one or more physical units)\n", 7858 desc, mdname(mddev), mdname(mddev2)); 7859 mddev_put(mddev2); 7860 if (signal_pending(current)) 7861 flush_signals(current); 7862 schedule(); 7863 finish_wait(&resync_wait, &wq); 7864 goto try_again; 7865 } 7866 finish_wait(&resync_wait, &wq); 7867 } 7868 } 7869 } while (mddev->curr_resync < 2); 7870 7871 j = 0; 7872 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7873 /* resync follows the size requested by the personality, 7874 * which defaults to physical size, but can be virtual size 7875 */ 7876 max_sectors = mddev->resync_max_sectors; 7877 atomic64_set(&mddev->resync_mismatches, 0); 7878 /* we don't use the checkpoint if there's a bitmap */ 7879 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7880 j = mddev->resync_min; 7881 else if (!mddev->bitmap) 7882 j = mddev->recovery_cp; 7883 7884 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7885 max_sectors = mddev->resync_max_sectors; 7886 else { 7887 /* recovery follows the physical size of devices */ 7888 max_sectors = mddev->dev_sectors; 7889 j = MaxSector; 7890 rcu_read_lock(); 7891 rdev_for_each_rcu(rdev, mddev) 7892 if (rdev->raid_disk >= 0 && 7893 !test_bit(Journal, &rdev->flags) && 7894 !test_bit(Faulty, &rdev->flags) && 7895 !test_bit(In_sync, &rdev->flags) && 7896 rdev->recovery_offset < j) 7897 j = rdev->recovery_offset; 7898 rcu_read_unlock(); 7899 7900 /* If there is a bitmap, we need to make sure all 7901 * writes that started before we added a spare 7902 * complete before we start doing a recovery. 7903 * Otherwise the write might complete and (via 7904 * bitmap_endwrite) set a bit in the bitmap after the 7905 * recovery has checked that bit and skipped that 7906 * region. 7907 */ 7908 if (mddev->bitmap) { 7909 mddev->pers->quiesce(mddev, 1); 7910 mddev->pers->quiesce(mddev, 0); 7911 } 7912 } 7913 7914 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); 7915 printk(KERN_INFO "md: minimum _guaranteed_ speed:" 7916 " %d KB/sec/disk.\n", speed_min(mddev)); 7917 printk(KERN_INFO "md: using maximum available idle IO bandwidth " 7918 "(but not more than %d KB/sec) for %s.\n", 7919 speed_max(mddev), desc); 7920 7921 is_mddev_idle(mddev, 1); /* this initializes IO event counters */ 7922 7923 io_sectors = 0; 7924 for (m = 0; m < SYNC_MARKS; m++) { 7925 mark[m] = jiffies; 7926 mark_cnt[m] = io_sectors; 7927 } 7928 last_mark = 0; 7929 mddev->resync_mark = mark[last_mark]; 7930 mddev->resync_mark_cnt = mark_cnt[last_mark]; 7931 7932 /* 7933 * Tune reconstruction: 7934 */ 7935 window = 32*(PAGE_SIZE/512); 7936 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", 7937 window/2, (unsigned long long)max_sectors/2); 7938 7939 atomic_set(&mddev->recovery_active, 0); 7940 last_check = 0; 7941 7942 if (j>2) { 7943 printk(KERN_INFO 7944 "md: resuming %s of %s from checkpoint.\n", 7945 desc, mdname(mddev)); 7946 mddev->curr_resync = j; 7947 } else 7948 mddev->curr_resync = 3; /* no longer delayed */ 7949 mddev->curr_resync_completed = j; 7950 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 7951 md_new_event(mddev); 7952 update_time = jiffies; 7953 7954 blk_start_plug(&plug); 7955 while (j < max_sectors) { 7956 sector_t sectors; 7957 7958 skipped = 0; 7959 7960 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 7961 ((mddev->curr_resync > mddev->curr_resync_completed && 7962 (mddev->curr_resync - mddev->curr_resync_completed) 7963 > (max_sectors >> 4)) || 7964 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || 7965 (j - mddev->curr_resync_completed)*2 7966 >= mddev->resync_max - mddev->curr_resync_completed || 7967 mddev->curr_resync_completed > mddev->resync_max 7968 )) { 7969 /* time to update curr_resync_completed */ 7970 wait_event(mddev->recovery_wait, 7971 atomic_read(&mddev->recovery_active) == 0); 7972 mddev->curr_resync_completed = j; 7973 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 7974 j > mddev->recovery_cp) 7975 mddev->recovery_cp = j; 7976 update_time = jiffies; 7977 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7978 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 7979 } 7980 7981 while (j >= mddev->resync_max && 7982 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 7983 /* As this condition is controlled by user-space, 7984 * we can block indefinitely, so use '_interruptible' 7985 * to avoid triggering warnings. 7986 */ 7987 flush_signals(current); /* just in case */ 7988 wait_event_interruptible(mddev->recovery_wait, 7989 mddev->resync_max > j 7990 || test_bit(MD_RECOVERY_INTR, 7991 &mddev->recovery)); 7992 } 7993 7994 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7995 break; 7996 7997 sectors = mddev->pers->sync_request(mddev, j, &skipped); 7998 if (sectors == 0) { 7999 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 8000 break; 8001 } 8002 8003 if (!skipped) { /* actual IO requested */ 8004 io_sectors += sectors; 8005 atomic_add(sectors, &mddev->recovery_active); 8006 } 8007 8008 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8009 break; 8010 8011 j += sectors; 8012 if (j > max_sectors) 8013 /* when skipping, extra large numbers can be returned. */ 8014 j = max_sectors; 8015 if (j > 2) 8016 mddev->curr_resync = j; 8017 mddev->curr_mark_cnt = io_sectors; 8018 if (last_check == 0) 8019 /* this is the earliest that rebuild will be 8020 * visible in /proc/mdstat 8021 */ 8022 md_new_event(mddev); 8023 8024 if (last_check + window > io_sectors || j == max_sectors) 8025 continue; 8026 8027 last_check = io_sectors; 8028 repeat: 8029 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 8030 /* step marks */ 8031 int next = (last_mark+1) % SYNC_MARKS; 8032 8033 mddev->resync_mark = mark[next]; 8034 mddev->resync_mark_cnt = mark_cnt[next]; 8035 mark[next] = jiffies; 8036 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 8037 last_mark = next; 8038 } 8039 8040 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8041 break; 8042 8043 /* 8044 * this loop exits only if either when we are slower than 8045 * the 'hard' speed limit, or the system was IO-idle for 8046 * a jiffy. 8047 * the system might be non-idle CPU-wise, but we only care 8048 * about not overloading the IO subsystem. (things like an 8049 * e2fsck being done on the RAID array should execute fast) 8050 */ 8051 cond_resched(); 8052 8053 recovery_done = io_sectors - atomic_read(&mddev->recovery_active); 8054 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 8055 /((jiffies-mddev->resync_mark)/HZ +1) +1; 8056 8057 if (currspeed > speed_min(mddev)) { 8058 if (currspeed > speed_max(mddev)) { 8059 msleep(500); 8060 goto repeat; 8061 } 8062 if (!is_mddev_idle(mddev, 0)) { 8063 /* 8064 * Give other IO more of a chance. 8065 * The faster the devices, the less we wait. 8066 */ 8067 wait_event(mddev->recovery_wait, 8068 !atomic_read(&mddev->recovery_active)); 8069 } 8070 } 8071 } 8072 printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, 8073 test_bit(MD_RECOVERY_INTR, &mddev->recovery) 8074 ? "interrupted" : "done"); 8075 /* 8076 * this also signals 'finished resyncing' to md_stop 8077 */ 8078 blk_finish_plug(&plug); 8079 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 8080 8081 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8082 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 8083 mddev->curr_resync > 2) { 8084 mddev->curr_resync_completed = mddev->curr_resync; 8085 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 8086 } 8087 /* tell personality and other nodes that we are finished */ 8088 if (mddev_is_clustered(mddev)) { 8089 md_cluster_ops->resync_finish(mddev); 8090 cluster_resync_finished = true; 8091 } 8092 mddev->pers->sync_request(mddev, max_sectors, &skipped); 8093 8094 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && 8095 mddev->curr_resync > 2) { 8096 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 8097 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 8098 if (mddev->curr_resync >= mddev->recovery_cp) { 8099 printk(KERN_INFO 8100 "md: checkpointing %s of %s.\n", 8101 desc, mdname(mddev)); 8102 if (test_bit(MD_RECOVERY_ERROR, 8103 &mddev->recovery)) 8104 mddev->recovery_cp = 8105 mddev->curr_resync_completed; 8106 else 8107 mddev->recovery_cp = 8108 mddev->curr_resync; 8109 } 8110 } else 8111 mddev->recovery_cp = MaxSector; 8112 } else { 8113 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8114 mddev->curr_resync = MaxSector; 8115 rcu_read_lock(); 8116 rdev_for_each_rcu(rdev, mddev) 8117 if (rdev->raid_disk >= 0 && 8118 mddev->delta_disks >= 0 && 8119 !test_bit(Journal, &rdev->flags) && 8120 !test_bit(Faulty, &rdev->flags) && 8121 !test_bit(In_sync, &rdev->flags) && 8122 rdev->recovery_offset < mddev->curr_resync) 8123 rdev->recovery_offset = mddev->curr_resync; 8124 rcu_read_unlock(); 8125 } 8126 } 8127 skip: 8128 set_bit(MD_CHANGE_DEVS, &mddev->flags); 8129 8130 if (mddev_is_clustered(mddev) && 8131 test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 8132 !cluster_resync_finished) 8133 md_cluster_ops->resync_finish(mddev); 8134 8135 spin_lock(&mddev->lock); 8136 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 8137 /* We completed so min/max setting can be forgotten if used. */ 8138 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 8139 mddev->resync_min = 0; 8140 mddev->resync_max = MaxSector; 8141 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 8142 mddev->resync_min = mddev->curr_resync_completed; 8143 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 8144 mddev->curr_resync = 0; 8145 spin_unlock(&mddev->lock); 8146 8147 wake_up(&resync_wait); 8148 md_wakeup_thread(mddev->thread); 8149 return; 8150 } 8151 EXPORT_SYMBOL_GPL(md_do_sync); 8152 8153 static int remove_and_add_spares(struct mddev *mddev, 8154 struct md_rdev *this) 8155 { 8156 struct md_rdev *rdev; 8157 int spares = 0; 8158 int removed = 0; 8159 8160 rdev_for_each(rdev, mddev) 8161 if ((this == NULL || rdev == this) && 8162 rdev->raid_disk >= 0 && 8163 !test_bit(Blocked, &rdev->flags) && 8164 (test_bit(Faulty, &rdev->flags) || 8165 (!test_bit(In_sync, &rdev->flags) && 8166 !test_bit(Journal, &rdev->flags))) && 8167 atomic_read(&rdev->nr_pending)==0) { 8168 if (mddev->pers->hot_remove_disk( 8169 mddev, rdev) == 0) { 8170 sysfs_unlink_rdev(mddev, rdev); 8171 rdev->raid_disk = -1; 8172 removed++; 8173 } 8174 } 8175 if (removed && mddev->kobj.sd) 8176 sysfs_notify(&mddev->kobj, NULL, "degraded"); 8177 8178 if (this && removed) 8179 goto no_add; 8180 8181 rdev_for_each(rdev, mddev) { 8182 if (this && this != rdev) 8183 continue; 8184 if (test_bit(Candidate, &rdev->flags)) 8185 continue; 8186 if (rdev->raid_disk >= 0 && 8187 !test_bit(In_sync, &rdev->flags) && 8188 !test_bit(Journal, &rdev->flags) && 8189 !test_bit(Faulty, &rdev->flags)) 8190 spares++; 8191 if (rdev->raid_disk >= 0) 8192 continue; 8193 if (test_bit(Faulty, &rdev->flags)) 8194 continue; 8195 if (!test_bit(Journal, &rdev->flags)) { 8196 if (mddev->ro && 8197 ! (rdev->saved_raid_disk >= 0 && 8198 !test_bit(Bitmap_sync, &rdev->flags))) 8199 continue; 8200 8201 rdev->recovery_offset = 0; 8202 } 8203 if (mddev->pers-> 8204 hot_add_disk(mddev, rdev) == 0) { 8205 if (sysfs_link_rdev(mddev, rdev)) 8206 /* failure here is OK */; 8207 if (!test_bit(Journal, &rdev->flags)) 8208 spares++; 8209 md_new_event(mddev); 8210 set_bit(MD_CHANGE_DEVS, &mddev->flags); 8211 } 8212 } 8213 no_add: 8214 if (removed) 8215 set_bit(MD_CHANGE_DEVS, &mddev->flags); 8216 return spares; 8217 } 8218 8219 static void md_start_sync(struct work_struct *ws) 8220 { 8221 struct mddev *mddev = container_of(ws, struct mddev, del_work); 8222 int ret = 0; 8223 8224 if (mddev_is_clustered(mddev)) { 8225 ret = md_cluster_ops->resync_start(mddev); 8226 if (ret) { 8227 mddev->sync_thread = NULL; 8228 goto out; 8229 } 8230 } 8231 8232 mddev->sync_thread = md_register_thread(md_do_sync, 8233 mddev, 8234 "resync"); 8235 out: 8236 if (!mddev->sync_thread) { 8237 if (!(mddev_is_clustered(mddev) && ret == -EAGAIN)) 8238 printk(KERN_ERR "%s: could not start resync" 8239 " thread...\n", 8240 mdname(mddev)); 8241 /* leave the spares where they are, it shouldn't hurt */ 8242 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 8243 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 8244 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 8245 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 8246 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 8247 wake_up(&resync_wait); 8248 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 8249 &mddev->recovery)) 8250 if (mddev->sysfs_action) 8251 sysfs_notify_dirent_safe(mddev->sysfs_action); 8252 } else 8253 md_wakeup_thread(mddev->sync_thread); 8254 sysfs_notify_dirent_safe(mddev->sysfs_action); 8255 md_new_event(mddev); 8256 } 8257 8258 /* 8259 * This routine is regularly called by all per-raid-array threads to 8260 * deal with generic issues like resync and super-block update. 8261 * Raid personalities that don't have a thread (linear/raid0) do not 8262 * need this as they never do any recovery or update the superblock. 8263 * 8264 * It does not do any resync itself, but rather "forks" off other threads 8265 * to do that as needed. 8266 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 8267 * "->recovery" and create a thread at ->sync_thread. 8268 * When the thread finishes it sets MD_RECOVERY_DONE 8269 * and wakeups up this thread which will reap the thread and finish up. 8270 * This thread also removes any faulty devices (with nr_pending == 0). 8271 * 8272 * The overall approach is: 8273 * 1/ if the superblock needs updating, update it. 8274 * 2/ If a recovery thread is running, don't do anything else. 8275 * 3/ If recovery has finished, clean up, possibly marking spares active. 8276 * 4/ If there are any faulty devices, remove them. 8277 * 5/ If array is degraded, try to add spares devices 8278 * 6/ If array has spares or is not in-sync, start a resync thread. 8279 */ 8280 void md_check_recovery(struct mddev *mddev) 8281 { 8282 if (mddev->suspended) 8283 return; 8284 8285 if (mddev->bitmap) 8286 bitmap_daemon_work(mddev); 8287 8288 if (signal_pending(current)) { 8289 if (mddev->pers->sync_request && !mddev->external) { 8290 printk(KERN_INFO "md: %s in immediate safe mode\n", 8291 mdname(mddev)); 8292 mddev->safemode = 2; 8293 } 8294 flush_signals(current); 8295 } 8296 8297 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 8298 return; 8299 if ( ! ( 8300 (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || 8301 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 8302 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 8303 test_bit(MD_RELOAD_SB, &mddev->flags) || 8304 (mddev->external == 0 && mddev->safemode == 1) || 8305 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 8306 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 8307 )) 8308 return; 8309 8310 if (mddev_trylock(mddev)) { 8311 int spares = 0; 8312 8313 if (mddev->ro) { 8314 struct md_rdev *rdev; 8315 if (!mddev->external && mddev->in_sync) 8316 /* 'Blocked' flag not needed as failed devices 8317 * will be recorded if array switched to read/write. 8318 * Leaving it set will prevent the device 8319 * from being removed. 8320 */ 8321 rdev_for_each(rdev, mddev) 8322 clear_bit(Blocked, &rdev->flags); 8323 /* On a read-only array we can: 8324 * - remove failed devices 8325 * - add already-in_sync devices if the array itself 8326 * is in-sync. 8327 * As we only add devices that are already in-sync, 8328 * we can activate the spares immediately. 8329 */ 8330 remove_and_add_spares(mddev, NULL); 8331 /* There is no thread, but we need to call 8332 * ->spare_active and clear saved_raid_disk 8333 */ 8334 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 8335 md_reap_sync_thread(mddev); 8336 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 8337 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 8338 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 8339 goto unlock; 8340 } 8341 8342 if (mddev_is_clustered(mddev)) { 8343 struct md_rdev *rdev; 8344 /* kick the device if another node issued a 8345 * remove disk. 8346 */ 8347 rdev_for_each(rdev, mddev) { 8348 if (test_and_clear_bit(ClusterRemove, &rdev->flags) && 8349 rdev->raid_disk < 0) 8350 md_kick_rdev_from_array(rdev); 8351 } 8352 8353 if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags)) 8354 md_reload_sb(mddev, mddev->good_device_nr); 8355 } 8356 8357 if (!mddev->external) { 8358 int did_change = 0; 8359 spin_lock(&mddev->lock); 8360 if (mddev->safemode && 8361 !atomic_read(&mddev->writes_pending) && 8362 !mddev->in_sync && 8363 mddev->recovery_cp == MaxSector) { 8364 mddev->in_sync = 1; 8365 did_change = 1; 8366 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 8367 } 8368 if (mddev->safemode == 1) 8369 mddev->safemode = 0; 8370 spin_unlock(&mddev->lock); 8371 if (did_change) 8372 sysfs_notify_dirent_safe(mddev->sysfs_state); 8373 } 8374 8375 if (mddev->flags & MD_UPDATE_SB_FLAGS) 8376 md_update_sb(mddev, 0); 8377 8378 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 8379 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 8380 /* resync/recovery still happening */ 8381 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 8382 goto unlock; 8383 } 8384 if (mddev->sync_thread) { 8385 md_reap_sync_thread(mddev); 8386 goto unlock; 8387 } 8388 /* Set RUNNING before clearing NEEDED to avoid 8389 * any transients in the value of "sync_action". 8390 */ 8391 mddev->curr_resync_completed = 0; 8392 spin_lock(&mddev->lock); 8393 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 8394 spin_unlock(&mddev->lock); 8395 /* Clear some bits that don't mean anything, but 8396 * might be left set 8397 */ 8398 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 8399 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 8400 8401 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 8402 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 8403 goto not_running; 8404 /* no recovery is running. 8405 * remove any failed drives, then 8406 * add spares if possible. 8407 * Spares are also removed and re-added, to allow 8408 * the personality to fail the re-add. 8409 */ 8410 8411 if (mddev->reshape_position != MaxSector) { 8412 if (mddev->pers->check_reshape == NULL || 8413 mddev->pers->check_reshape(mddev) != 0) 8414 /* Cannot proceed */ 8415 goto not_running; 8416 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 8417 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 8418 } else if ((spares = remove_and_add_spares(mddev, NULL))) { 8419 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 8420 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 8421 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 8422 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 8423 } else if (mddev->recovery_cp < MaxSector) { 8424 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 8425 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 8426 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 8427 /* nothing to be done ... */ 8428 goto not_running; 8429 8430 if (mddev->pers->sync_request) { 8431 if (spares) { 8432 /* We are adding a device or devices to an array 8433 * which has the bitmap stored on all devices. 8434 * So make sure all bitmap pages get written 8435 */ 8436 bitmap_write_all(mddev->bitmap); 8437 } 8438 INIT_WORK(&mddev->del_work, md_start_sync); 8439 queue_work(md_misc_wq, &mddev->del_work); 8440 goto unlock; 8441 } 8442 not_running: 8443 if (!mddev->sync_thread) { 8444 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 8445 wake_up(&resync_wait); 8446 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 8447 &mddev->recovery)) 8448 if (mddev->sysfs_action) 8449 sysfs_notify_dirent_safe(mddev->sysfs_action); 8450 } 8451 unlock: 8452 wake_up(&mddev->sb_wait); 8453 mddev_unlock(mddev); 8454 } 8455 } 8456 EXPORT_SYMBOL(md_check_recovery); 8457 8458 void md_reap_sync_thread(struct mddev *mddev) 8459 { 8460 struct md_rdev *rdev; 8461 8462 /* resync has finished, collect result */ 8463 md_unregister_thread(&mddev->sync_thread); 8464 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 8465 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 8466 /* success...*/ 8467 /* activate any spares */ 8468 if (mddev->pers->spare_active(mddev)) { 8469 sysfs_notify(&mddev->kobj, NULL, 8470 "degraded"); 8471 set_bit(MD_CHANGE_DEVS, &mddev->flags); 8472 } 8473 } 8474 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8475 mddev->pers->finish_reshape) 8476 mddev->pers->finish_reshape(mddev); 8477 8478 /* If array is no-longer degraded, then any saved_raid_disk 8479 * information must be scrapped. 8480 */ 8481 if (!mddev->degraded) 8482 rdev_for_each(rdev, mddev) 8483 rdev->saved_raid_disk = -1; 8484 8485 md_update_sb(mddev, 1); 8486 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 8487 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 8488 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 8489 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 8490 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 8491 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 8492 wake_up(&resync_wait); 8493 /* flag recovery needed just to double check */ 8494 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 8495 sysfs_notify_dirent_safe(mddev->sysfs_action); 8496 md_new_event(mddev); 8497 if (mddev->event_work.func) 8498 queue_work(md_misc_wq, &mddev->event_work); 8499 } 8500 EXPORT_SYMBOL(md_reap_sync_thread); 8501 8502 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) 8503 { 8504 sysfs_notify_dirent_safe(rdev->sysfs_state); 8505 wait_event_timeout(rdev->blocked_wait, 8506 !test_bit(Blocked, &rdev->flags) && 8507 !test_bit(BlockedBadBlocks, &rdev->flags), 8508 msecs_to_jiffies(5000)); 8509 rdev_dec_pending(rdev, mddev); 8510 } 8511 EXPORT_SYMBOL(md_wait_for_blocked_rdev); 8512 8513 void md_finish_reshape(struct mddev *mddev) 8514 { 8515 /* called be personality module when reshape completes. */ 8516 struct md_rdev *rdev; 8517 8518 rdev_for_each(rdev, mddev) { 8519 if (rdev->data_offset > rdev->new_data_offset) 8520 rdev->sectors += rdev->data_offset - rdev->new_data_offset; 8521 else 8522 rdev->sectors -= rdev->new_data_offset - rdev->data_offset; 8523 rdev->data_offset = rdev->new_data_offset; 8524 } 8525 } 8526 EXPORT_SYMBOL(md_finish_reshape); 8527 8528 /* Bad block management */ 8529 8530 /* Returns 1 on success, 0 on failure */ 8531 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 8532 int is_new) 8533 { 8534 int rv; 8535 if (is_new) 8536 s += rdev->new_data_offset; 8537 else 8538 s += rdev->data_offset; 8539 rv = badblocks_set(&rdev->badblocks, s, sectors, 0); 8540 if (rv == 0) { 8541 /* Make sure they get written out promptly */ 8542 sysfs_notify_dirent_safe(rdev->sysfs_state); 8543 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); 8544 set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags); 8545 md_wakeup_thread(rdev->mddev->thread); 8546 return 1; 8547 } else 8548 return 0; 8549 } 8550 EXPORT_SYMBOL_GPL(rdev_set_badblocks); 8551 8552 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 8553 int is_new) 8554 { 8555 if (is_new) 8556 s += rdev->new_data_offset; 8557 else 8558 s += rdev->data_offset; 8559 return badblocks_clear(&rdev->badblocks, 8560 s, sectors); 8561 } 8562 EXPORT_SYMBOL_GPL(rdev_clear_badblocks); 8563 8564 static int md_notify_reboot(struct notifier_block *this, 8565 unsigned long code, void *x) 8566 { 8567 struct list_head *tmp; 8568 struct mddev *mddev; 8569 int need_delay = 0; 8570 8571 for_each_mddev(mddev, tmp) { 8572 if (mddev_trylock(mddev)) { 8573 if (mddev->pers) 8574 __md_stop_writes(mddev); 8575 if (mddev->persistent) 8576 mddev->safemode = 2; 8577 mddev_unlock(mddev); 8578 } 8579 need_delay = 1; 8580 } 8581 /* 8582 * certain more exotic SCSI devices are known to be 8583 * volatile wrt too early system reboots. While the 8584 * right place to handle this issue is the given 8585 * driver, we do want to have a safe RAID driver ... 8586 */ 8587 if (need_delay) 8588 mdelay(1000*1); 8589 8590 return NOTIFY_DONE; 8591 } 8592 8593 static struct notifier_block md_notifier = { 8594 .notifier_call = md_notify_reboot, 8595 .next = NULL, 8596 .priority = INT_MAX, /* before any real devices */ 8597 }; 8598 8599 static void md_geninit(void) 8600 { 8601 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 8602 8603 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); 8604 } 8605 8606 static int __init md_init(void) 8607 { 8608 int ret = -ENOMEM; 8609 8610 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); 8611 if (!md_wq) 8612 goto err_wq; 8613 8614 md_misc_wq = alloc_workqueue("md_misc", 0, 0); 8615 if (!md_misc_wq) 8616 goto err_misc_wq; 8617 8618 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) 8619 goto err_md; 8620 8621 if ((ret = register_blkdev(0, "mdp")) < 0) 8622 goto err_mdp; 8623 mdp_major = ret; 8624 8625 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, 8626 md_probe, NULL, NULL); 8627 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, 8628 md_probe, NULL, NULL); 8629 8630 register_reboot_notifier(&md_notifier); 8631 raid_table_header = register_sysctl_table(raid_root_table); 8632 8633 md_geninit(); 8634 return 0; 8635 8636 err_mdp: 8637 unregister_blkdev(MD_MAJOR, "md"); 8638 err_md: 8639 destroy_workqueue(md_misc_wq); 8640 err_misc_wq: 8641 destroy_workqueue(md_wq); 8642 err_wq: 8643 return ret; 8644 } 8645 8646 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) 8647 { 8648 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 8649 struct md_rdev *rdev2; 8650 int role, ret; 8651 char b[BDEVNAME_SIZE]; 8652 8653 /* Check for change of roles in the active devices */ 8654 rdev_for_each(rdev2, mddev) { 8655 if (test_bit(Faulty, &rdev2->flags)) 8656 continue; 8657 8658 /* Check if the roles changed */ 8659 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); 8660 8661 if (test_bit(Candidate, &rdev2->flags)) { 8662 if (role == 0xfffe) { 8663 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); 8664 md_kick_rdev_from_array(rdev2); 8665 continue; 8666 } 8667 else 8668 clear_bit(Candidate, &rdev2->flags); 8669 } 8670 8671 if (role != rdev2->raid_disk) { 8672 /* got activated */ 8673 if (rdev2->raid_disk == -1 && role != 0xffff) { 8674 rdev2->saved_raid_disk = role; 8675 ret = remove_and_add_spares(mddev, rdev2); 8676 pr_info("Activated spare: %s\n", 8677 bdevname(rdev2->bdev,b)); 8678 } 8679 /* device faulty 8680 * We just want to do the minimum to mark the disk 8681 * as faulty. The recovery is performed by the 8682 * one who initiated the error. 8683 */ 8684 if ((role == 0xfffe) || (role == 0xfffd)) { 8685 md_error(mddev, rdev2); 8686 clear_bit(Blocked, &rdev2->flags); 8687 } 8688 } 8689 } 8690 8691 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) 8692 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); 8693 8694 /* Finally set the event to be up to date */ 8695 mddev->events = le64_to_cpu(sb->events); 8696 } 8697 8698 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) 8699 { 8700 int err; 8701 struct page *swapout = rdev->sb_page; 8702 struct mdp_superblock_1 *sb; 8703 8704 /* Store the sb page of the rdev in the swapout temporary 8705 * variable in case we err in the future 8706 */ 8707 rdev->sb_page = NULL; 8708 alloc_disk_sb(rdev); 8709 ClearPageUptodate(rdev->sb_page); 8710 rdev->sb_loaded = 0; 8711 err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version); 8712 8713 if (err < 0) { 8714 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", 8715 __func__, __LINE__, rdev->desc_nr, err); 8716 put_page(rdev->sb_page); 8717 rdev->sb_page = swapout; 8718 rdev->sb_loaded = 1; 8719 return err; 8720 } 8721 8722 sb = page_address(rdev->sb_page); 8723 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET 8724 * is not set 8725 */ 8726 8727 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) 8728 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 8729 8730 /* The other node finished recovery, call spare_active to set 8731 * device In_sync and mddev->degraded 8732 */ 8733 if (rdev->recovery_offset == MaxSector && 8734 !test_bit(In_sync, &rdev->flags) && 8735 mddev->pers->spare_active(mddev)) 8736 sysfs_notify(&mddev->kobj, NULL, "degraded"); 8737 8738 put_page(swapout); 8739 return 0; 8740 } 8741 8742 void md_reload_sb(struct mddev *mddev, int nr) 8743 { 8744 struct md_rdev *rdev; 8745 int err; 8746 8747 /* Find the rdev */ 8748 rdev_for_each_rcu(rdev, mddev) { 8749 if (rdev->desc_nr == nr) 8750 break; 8751 } 8752 8753 if (!rdev || rdev->desc_nr != nr) { 8754 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); 8755 return; 8756 } 8757 8758 err = read_rdev(mddev, rdev); 8759 if (err < 0) 8760 return; 8761 8762 check_sb_changes(mddev, rdev); 8763 8764 /* Read all rdev's to update recovery_offset */ 8765 rdev_for_each_rcu(rdev, mddev) 8766 read_rdev(mddev, rdev); 8767 } 8768 EXPORT_SYMBOL(md_reload_sb); 8769 8770 #ifndef MODULE 8771 8772 /* 8773 * Searches all registered partitions for autorun RAID arrays 8774 * at boot time. 8775 */ 8776 8777 static LIST_HEAD(all_detected_devices); 8778 struct detected_devices_node { 8779 struct list_head list; 8780 dev_t dev; 8781 }; 8782 8783 void md_autodetect_dev(dev_t dev) 8784 { 8785 struct detected_devices_node *node_detected_dev; 8786 8787 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); 8788 if (node_detected_dev) { 8789 node_detected_dev->dev = dev; 8790 list_add_tail(&node_detected_dev->list, &all_detected_devices); 8791 } else { 8792 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" 8793 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); 8794 } 8795 } 8796 8797 static void autostart_arrays(int part) 8798 { 8799 struct md_rdev *rdev; 8800 struct detected_devices_node *node_detected_dev; 8801 dev_t dev; 8802 int i_scanned, i_passed; 8803 8804 i_scanned = 0; 8805 i_passed = 0; 8806 8807 printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); 8808 8809 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { 8810 i_scanned++; 8811 node_detected_dev = list_entry(all_detected_devices.next, 8812 struct detected_devices_node, list); 8813 list_del(&node_detected_dev->list); 8814 dev = node_detected_dev->dev; 8815 kfree(node_detected_dev); 8816 rdev = md_import_device(dev,0, 90); 8817 if (IS_ERR(rdev)) 8818 continue; 8819 8820 if (test_bit(Faulty, &rdev->flags)) 8821 continue; 8822 8823 set_bit(AutoDetected, &rdev->flags); 8824 list_add(&rdev->same_set, &pending_raid_disks); 8825 i_passed++; 8826 } 8827 8828 printk(KERN_INFO "md: Scanned %d and added %d devices.\n", 8829 i_scanned, i_passed); 8830 8831 autorun_devices(part); 8832 } 8833 8834 #endif /* !MODULE */ 8835 8836 static __exit void md_exit(void) 8837 { 8838 struct mddev *mddev; 8839 struct list_head *tmp; 8840 int delay = 1; 8841 8842 blk_unregister_region(MKDEV(MD_MAJOR,0), 512); 8843 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); 8844 8845 unregister_blkdev(MD_MAJOR,"md"); 8846 unregister_blkdev(mdp_major, "mdp"); 8847 unregister_reboot_notifier(&md_notifier); 8848 unregister_sysctl_table(raid_table_header); 8849 8850 /* We cannot unload the modules while some process is 8851 * waiting for us in select() or poll() - wake them up 8852 */ 8853 md_unloading = 1; 8854 while (waitqueue_active(&md_event_waiters)) { 8855 /* not safe to leave yet */ 8856 wake_up(&md_event_waiters); 8857 msleep(delay); 8858 delay += delay; 8859 } 8860 remove_proc_entry("mdstat", NULL); 8861 8862 for_each_mddev(mddev, tmp) { 8863 export_array(mddev); 8864 mddev->hold_active = 0; 8865 } 8866 destroy_workqueue(md_misc_wq); 8867 destroy_workqueue(md_wq); 8868 } 8869 8870 subsys_initcall(md_init); 8871 module_exit(md_exit) 8872 8873 static int get_ro(char *buffer, struct kernel_param *kp) 8874 { 8875 return sprintf(buffer, "%d", start_readonly); 8876 } 8877 static int set_ro(const char *val, struct kernel_param *kp) 8878 { 8879 return kstrtouint(val, 10, (unsigned int *)&start_readonly); 8880 } 8881 8882 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); 8883 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); 8884 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); 8885 8886 MODULE_LICENSE("GPL"); 8887 MODULE_DESCRIPTION("MD RAID framework"); 8888 MODULE_ALIAS("md"); 8889 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 8890