1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 md.c : Multiple Devices driver for Linux 4 Copyright (C) 1998, 1999, 2000 Ingo Molnar 5 6 completely rewritten, based on the MD driver code from Marc Zyngier 7 8 Changes: 9 10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar 11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> 12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> 13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su> 14 - kmod support by: Cyrus Durgin 15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> 16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> 17 18 - lots of fixes and improvements to the RAID1/RAID5 and generic 19 RAID code (such as request based resynchronization): 20 21 Neil Brown <neilb@cse.unsw.edu.au>. 22 23 - persistent bitmap code 24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. 25 26 27 Errors, Warnings, etc. 28 Please use: 29 pr_crit() for error conditions that risk data loss 30 pr_err() for error conditions that are unexpected, like an IO error 31 or internal inconsistency 32 pr_warn() for error conditions that could have been predicated, like 33 adding a device to an array when it has incompatible metadata 34 pr_info() for every interesting, very rare events, like an array starting 35 or stopping, or resync starting or stopping 36 pr_debug() for everything else. 37 38 */ 39 40 #include <linux/sched/mm.h> 41 #include <linux/sched/signal.h> 42 #include <linux/kthread.h> 43 #include <linux/blkdev.h> 44 #include <linux/badblocks.h> 45 #include <linux/sysctl.h> 46 #include <linux/seq_file.h> 47 #include <linux/fs.h> 48 #include <linux/poll.h> 49 #include <linux/ctype.h> 50 #include <linux/string.h> 51 #include <linux/hdreg.h> 52 #include <linux/proc_fs.h> 53 #include <linux/random.h> 54 #include <linux/module.h> 55 #include <linux/reboot.h> 56 #include <linux/file.h> 57 #include <linux/compat.h> 58 #include <linux/delay.h> 59 #include <linux/raid/md_p.h> 60 #include <linux/raid/md_u.h> 61 #include <linux/raid/detect.h> 62 #include <linux/slab.h> 63 #include <linux/percpu-refcount.h> 64 #include <linux/part_stat.h> 65 66 #include <trace/events/block.h> 67 #include "md.h" 68 #include "md-bitmap.h" 69 #include "md-cluster.h" 70 71 #ifndef MODULE 72 static void autostart_arrays(int part); 73 #endif 74 75 /* pers_list is a list of registered personalities protected 76 * by pers_lock. 77 * pers_lock does extra service to protect accesses to 78 * mddev->thread when the mutex cannot be held. 79 */ 80 static LIST_HEAD(pers_list); 81 static DEFINE_SPINLOCK(pers_lock); 82 83 static struct kobj_type md_ktype; 84 85 struct md_cluster_operations *md_cluster_ops; 86 EXPORT_SYMBOL(md_cluster_ops); 87 static struct module *md_cluster_mod; 88 89 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 90 static struct workqueue_struct *md_wq; 91 static struct workqueue_struct *md_misc_wq; 92 93 static int remove_and_add_spares(struct mddev *mddev, 94 struct md_rdev *this); 95 static void mddev_detach(struct mddev *mddev); 96 97 /* 98 * Default number of read corrections we'll attempt on an rdev 99 * before ejecting it from the array. We divide the read error 100 * count by 2 for every hour elapsed between read errors. 101 */ 102 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 103 /* 104 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 105 * is 1000 KB/sec, so the extra system load does not show up that much. 106 * Increase it if you want to have more _guaranteed_ speed. Note that 107 * the RAID driver will use the maximum available bandwidth if the IO 108 * subsystem is idle. There is also an 'absolute maximum' reconstruction 109 * speed limit - in case reconstruction slows down your system despite 110 * idle IO detection. 111 * 112 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 113 * or /sys/block/mdX/md/sync_speed_{min,max} 114 */ 115 116 static int sysctl_speed_limit_min = 1000; 117 static int sysctl_speed_limit_max = 200000; 118 static inline int speed_min(struct mddev *mddev) 119 { 120 return mddev->sync_speed_min ? 121 mddev->sync_speed_min : sysctl_speed_limit_min; 122 } 123 124 static inline int speed_max(struct mddev *mddev) 125 { 126 return mddev->sync_speed_max ? 127 mddev->sync_speed_max : sysctl_speed_limit_max; 128 } 129 130 static void rdev_uninit_serial(struct md_rdev *rdev) 131 { 132 if (!test_and_clear_bit(CollisionCheck, &rdev->flags)) 133 return; 134 135 kvfree(rdev->serial); 136 rdev->serial = NULL; 137 } 138 139 static void rdevs_uninit_serial(struct mddev *mddev) 140 { 141 struct md_rdev *rdev; 142 143 rdev_for_each(rdev, mddev) 144 rdev_uninit_serial(rdev); 145 } 146 147 static int rdev_init_serial(struct md_rdev *rdev) 148 { 149 /* serial_nums equals with BARRIER_BUCKETS_NR */ 150 int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t)))); 151 struct serial_in_rdev *serial = NULL; 152 153 if (test_bit(CollisionCheck, &rdev->flags)) 154 return 0; 155 156 serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums, 157 GFP_KERNEL); 158 if (!serial) 159 return -ENOMEM; 160 161 for (i = 0; i < serial_nums; i++) { 162 struct serial_in_rdev *serial_tmp = &serial[i]; 163 164 spin_lock_init(&serial_tmp->serial_lock); 165 serial_tmp->serial_rb = RB_ROOT_CACHED; 166 init_waitqueue_head(&serial_tmp->serial_io_wait); 167 } 168 169 rdev->serial = serial; 170 set_bit(CollisionCheck, &rdev->flags); 171 172 return 0; 173 } 174 175 static int rdevs_init_serial(struct mddev *mddev) 176 { 177 struct md_rdev *rdev; 178 int ret = 0; 179 180 rdev_for_each(rdev, mddev) { 181 ret = rdev_init_serial(rdev); 182 if (ret) 183 break; 184 } 185 186 /* Free all resources if pool is not existed */ 187 if (ret && !mddev->serial_info_pool) 188 rdevs_uninit_serial(mddev); 189 190 return ret; 191 } 192 193 /* 194 * rdev needs to enable serial stuffs if it meets the conditions: 195 * 1. it is multi-queue device flaged with writemostly. 196 * 2. the write-behind mode is enabled. 197 */ 198 static int rdev_need_serial(struct md_rdev *rdev) 199 { 200 return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 && 201 rdev->bdev->bd_queue->nr_hw_queues != 1 && 202 test_bit(WriteMostly, &rdev->flags)); 203 } 204 205 /* 206 * Init resource for rdev(s), then create serial_info_pool if: 207 * 1. rdev is the first device which return true from rdev_enable_serial. 208 * 2. rdev is NULL, means we want to enable serialization for all rdevs. 209 */ 210 void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, 211 bool is_suspend) 212 { 213 int ret = 0; 214 215 if (rdev && !rdev_need_serial(rdev) && 216 !test_bit(CollisionCheck, &rdev->flags)) 217 return; 218 219 if (!is_suspend) 220 mddev_suspend(mddev); 221 222 if (!rdev) 223 ret = rdevs_init_serial(mddev); 224 else 225 ret = rdev_init_serial(rdev); 226 if (ret) 227 goto abort; 228 229 if (mddev->serial_info_pool == NULL) { 230 unsigned int noio_flag; 231 232 noio_flag = memalloc_noio_save(); 233 mddev->serial_info_pool = 234 mempool_create_kmalloc_pool(NR_SERIAL_INFOS, 235 sizeof(struct serial_info)); 236 memalloc_noio_restore(noio_flag); 237 if (!mddev->serial_info_pool) { 238 rdevs_uninit_serial(mddev); 239 pr_err("can't alloc memory pool for serialization\n"); 240 } 241 } 242 243 abort: 244 if (!is_suspend) 245 mddev_resume(mddev); 246 } 247 248 /* 249 * Free resource from rdev(s), and destroy serial_info_pool under conditions: 250 * 1. rdev is the last device flaged with CollisionCheck. 251 * 2. when bitmap is destroyed while policy is not enabled. 252 * 3. for disable policy, the pool is destroyed only when no rdev needs it. 253 */ 254 void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, 255 bool is_suspend) 256 { 257 if (rdev && !test_bit(CollisionCheck, &rdev->flags)) 258 return; 259 260 if (mddev->serial_info_pool) { 261 struct md_rdev *temp; 262 int num = 0; /* used to track if other rdevs need the pool */ 263 264 if (!is_suspend) 265 mddev_suspend(mddev); 266 rdev_for_each(temp, mddev) { 267 if (!rdev) { 268 if (!mddev->serialize_policy || 269 !rdev_need_serial(temp)) 270 rdev_uninit_serial(temp); 271 else 272 num++; 273 } else if (temp != rdev && 274 test_bit(CollisionCheck, &temp->flags)) 275 num++; 276 } 277 278 if (rdev) 279 rdev_uninit_serial(rdev); 280 281 if (num) 282 pr_info("The mempool could be used by other devices\n"); 283 else { 284 mempool_destroy(mddev->serial_info_pool); 285 mddev->serial_info_pool = NULL; 286 } 287 if (!is_suspend) 288 mddev_resume(mddev); 289 } 290 } 291 292 static struct ctl_table_header *raid_table_header; 293 294 static struct ctl_table raid_table[] = { 295 { 296 .procname = "speed_limit_min", 297 .data = &sysctl_speed_limit_min, 298 .maxlen = sizeof(int), 299 .mode = S_IRUGO|S_IWUSR, 300 .proc_handler = proc_dointvec, 301 }, 302 { 303 .procname = "speed_limit_max", 304 .data = &sysctl_speed_limit_max, 305 .maxlen = sizeof(int), 306 .mode = S_IRUGO|S_IWUSR, 307 .proc_handler = proc_dointvec, 308 }, 309 { } 310 }; 311 312 static struct ctl_table raid_dir_table[] = { 313 { 314 .procname = "raid", 315 .maxlen = 0, 316 .mode = S_IRUGO|S_IXUGO, 317 .child = raid_table, 318 }, 319 { } 320 }; 321 322 static struct ctl_table raid_root_table[] = { 323 { 324 .procname = "dev", 325 .maxlen = 0, 326 .mode = 0555, 327 .child = raid_dir_table, 328 }, 329 { } 330 }; 331 332 static const struct block_device_operations md_fops; 333 334 static int start_readonly; 335 336 /* 337 * The original mechanism for creating an md device is to create 338 * a device node in /dev and to open it. This causes races with device-close. 339 * The preferred method is to write to the "new_array" module parameter. 340 * This can avoid races. 341 * Setting create_on_open to false disables the original mechanism 342 * so all the races disappear. 343 */ 344 static bool create_on_open = true; 345 346 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, 347 struct mddev *mddev) 348 { 349 if (!mddev || !bioset_initialized(&mddev->bio_set)) 350 return bio_alloc(gfp_mask, nr_iovecs); 351 352 return bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set); 353 } 354 EXPORT_SYMBOL_GPL(bio_alloc_mddev); 355 356 static struct bio *md_bio_alloc_sync(struct mddev *mddev) 357 { 358 if (!mddev || !bioset_initialized(&mddev->sync_set)) 359 return bio_alloc(GFP_NOIO, 1); 360 361 return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set); 362 } 363 364 /* 365 * We have a system wide 'event count' that is incremented 366 * on any 'interesting' event, and readers of /proc/mdstat 367 * can use 'poll' or 'select' to find out when the event 368 * count increases. 369 * 370 * Events are: 371 * start array, stop array, error, add device, remove device, 372 * start build, activate spare 373 */ 374 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); 375 static atomic_t md_event_count; 376 void md_new_event(struct mddev *mddev) 377 { 378 atomic_inc(&md_event_count); 379 wake_up(&md_event_waiters); 380 } 381 EXPORT_SYMBOL_GPL(md_new_event); 382 383 /* 384 * Enables to iterate over all existing md arrays 385 * all_mddevs_lock protects this list. 386 */ 387 static LIST_HEAD(all_mddevs); 388 static DEFINE_SPINLOCK(all_mddevs_lock); 389 390 /* 391 * iterates through all used mddevs in the system. 392 * We take care to grab the all_mddevs_lock whenever navigating 393 * the list, and to always hold a refcount when unlocked. 394 * Any code which breaks out of this loop while own 395 * a reference to the current mddev and must mddev_put it. 396 */ 397 #define for_each_mddev(_mddev,_tmp) \ 398 \ 399 for (({ spin_lock(&all_mddevs_lock); \ 400 _tmp = all_mddevs.next; \ 401 _mddev = NULL;}); \ 402 ({ if (_tmp != &all_mddevs) \ 403 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ 404 spin_unlock(&all_mddevs_lock); \ 405 if (_mddev) mddev_put(_mddev); \ 406 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ 407 _tmp != &all_mddevs;}); \ 408 ({ spin_lock(&all_mddevs_lock); \ 409 _tmp = _tmp->next;}) \ 410 ) 411 412 /* Rather than calling directly into the personality make_request function, 413 * IO requests come here first so that we can check if the device is 414 * being suspended pending a reconfiguration. 415 * We hold a refcount over the call to ->make_request. By the time that 416 * call has finished, the bio has been linked into some internal structure 417 * and so is visible to ->quiesce(), so we don't need the refcount any more. 418 */ 419 static bool is_suspended(struct mddev *mddev, struct bio *bio) 420 { 421 if (mddev->suspended) 422 return true; 423 if (bio_data_dir(bio) != WRITE) 424 return false; 425 if (mddev->suspend_lo >= mddev->suspend_hi) 426 return false; 427 if (bio->bi_iter.bi_sector >= mddev->suspend_hi) 428 return false; 429 if (bio_end_sector(bio) < mddev->suspend_lo) 430 return false; 431 return true; 432 } 433 434 void md_handle_request(struct mddev *mddev, struct bio *bio) 435 { 436 check_suspended: 437 rcu_read_lock(); 438 if (is_suspended(mddev, bio)) { 439 DEFINE_WAIT(__wait); 440 for (;;) { 441 prepare_to_wait(&mddev->sb_wait, &__wait, 442 TASK_UNINTERRUPTIBLE); 443 if (!is_suspended(mddev, bio)) 444 break; 445 rcu_read_unlock(); 446 schedule(); 447 rcu_read_lock(); 448 } 449 finish_wait(&mddev->sb_wait, &__wait); 450 } 451 atomic_inc(&mddev->active_io); 452 rcu_read_unlock(); 453 454 if (!mddev->pers->make_request(mddev, bio)) { 455 atomic_dec(&mddev->active_io); 456 wake_up(&mddev->sb_wait); 457 goto check_suspended; 458 } 459 460 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) 461 wake_up(&mddev->sb_wait); 462 } 463 EXPORT_SYMBOL(md_handle_request); 464 465 static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) 466 { 467 const int rw = bio_data_dir(bio); 468 const int sgrp = op_stat_group(bio_op(bio)); 469 struct mddev *mddev = q->queuedata; 470 unsigned int sectors; 471 472 if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) { 473 bio_io_error(bio); 474 return BLK_QC_T_NONE; 475 } 476 477 blk_queue_split(q, &bio); 478 479 if (mddev == NULL || mddev->pers == NULL) { 480 bio_io_error(bio); 481 return BLK_QC_T_NONE; 482 } 483 if (mddev->ro == 1 && unlikely(rw == WRITE)) { 484 if (bio_sectors(bio) != 0) 485 bio->bi_status = BLK_STS_IOERR; 486 bio_endio(bio); 487 return BLK_QC_T_NONE; 488 } 489 490 /* 491 * save the sectors now since our bio can 492 * go away inside make_request 493 */ 494 sectors = bio_sectors(bio); 495 /* bio could be mergeable after passing to underlayer */ 496 bio->bi_opf &= ~REQ_NOMERGE; 497 498 md_handle_request(mddev, bio); 499 500 part_stat_lock(); 501 part_stat_inc(&mddev->gendisk->part0, ios[sgrp]); 502 part_stat_add(&mddev->gendisk->part0, sectors[sgrp], sectors); 503 part_stat_unlock(); 504 505 return BLK_QC_T_NONE; 506 } 507 508 /* mddev_suspend makes sure no new requests are submitted 509 * to the device, and that any requests that have been submitted 510 * are completely handled. 511 * Once mddev_detach() is called and completes, the module will be 512 * completely unused. 513 */ 514 void mddev_suspend(struct mddev *mddev) 515 { 516 WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk); 517 lockdep_assert_held(&mddev->reconfig_mutex); 518 if (mddev->suspended++) 519 return; 520 synchronize_rcu(); 521 wake_up(&mddev->sb_wait); 522 set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags); 523 smp_mb__after_atomic(); 524 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); 525 mddev->pers->quiesce(mddev, 1); 526 clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags); 527 wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags)); 528 529 del_timer_sync(&mddev->safemode_timer); 530 } 531 EXPORT_SYMBOL_GPL(mddev_suspend); 532 533 void mddev_resume(struct mddev *mddev) 534 { 535 lockdep_assert_held(&mddev->reconfig_mutex); 536 if (--mddev->suspended) 537 return; 538 wake_up(&mddev->sb_wait); 539 mddev->pers->quiesce(mddev, 0); 540 541 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 542 md_wakeup_thread(mddev->thread); 543 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 544 } 545 EXPORT_SYMBOL_GPL(mddev_resume); 546 547 int mddev_congested(struct mddev *mddev, int bits) 548 { 549 struct md_personality *pers = mddev->pers; 550 int ret = 0; 551 552 rcu_read_lock(); 553 if (mddev->suspended) 554 ret = 1; 555 else if (pers && pers->congested) 556 ret = pers->congested(mddev, bits); 557 rcu_read_unlock(); 558 return ret; 559 } 560 EXPORT_SYMBOL_GPL(mddev_congested); 561 static int md_congested(void *data, int bits) 562 { 563 struct mddev *mddev = data; 564 return mddev_congested(mddev, bits); 565 } 566 567 /* 568 * Generic flush handling for md 569 */ 570 571 static void md_end_flush(struct bio *bio) 572 { 573 struct md_rdev *rdev = bio->bi_private; 574 struct mddev *mddev = rdev->mddev; 575 576 rdev_dec_pending(rdev, mddev); 577 578 if (atomic_dec_and_test(&mddev->flush_pending)) { 579 /* The pre-request flush has finished */ 580 queue_work(md_wq, &mddev->flush_work); 581 } 582 bio_put(bio); 583 } 584 585 static void md_submit_flush_data(struct work_struct *ws); 586 587 static void submit_flushes(struct work_struct *ws) 588 { 589 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 590 struct md_rdev *rdev; 591 592 mddev->start_flush = ktime_get_boottime(); 593 INIT_WORK(&mddev->flush_work, md_submit_flush_data); 594 atomic_set(&mddev->flush_pending, 1); 595 rcu_read_lock(); 596 rdev_for_each_rcu(rdev, mddev) 597 if (rdev->raid_disk >= 0 && 598 !test_bit(Faulty, &rdev->flags)) { 599 /* Take two references, one is dropped 600 * when request finishes, one after 601 * we reclaim rcu_read_lock 602 */ 603 struct bio *bi; 604 atomic_inc(&rdev->nr_pending); 605 atomic_inc(&rdev->nr_pending); 606 rcu_read_unlock(); 607 bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); 608 bi->bi_end_io = md_end_flush; 609 bi->bi_private = rdev; 610 bio_set_dev(bi, rdev->bdev); 611 bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; 612 atomic_inc(&mddev->flush_pending); 613 submit_bio(bi); 614 rcu_read_lock(); 615 rdev_dec_pending(rdev, mddev); 616 } 617 rcu_read_unlock(); 618 if (atomic_dec_and_test(&mddev->flush_pending)) 619 queue_work(md_wq, &mddev->flush_work); 620 } 621 622 static void md_submit_flush_data(struct work_struct *ws) 623 { 624 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 625 struct bio *bio = mddev->flush_bio; 626 627 /* 628 * must reset flush_bio before calling into md_handle_request to avoid a 629 * deadlock, because other bios passed md_handle_request suspend check 630 * could wait for this and below md_handle_request could wait for those 631 * bios because of suspend check 632 */ 633 mddev->last_flush = mddev->start_flush; 634 mddev->flush_bio = NULL; 635 wake_up(&mddev->sb_wait); 636 637 if (bio->bi_iter.bi_size == 0) { 638 /* an empty barrier - all done */ 639 bio_endio(bio); 640 } else { 641 bio->bi_opf &= ~REQ_PREFLUSH; 642 md_handle_request(mddev, bio); 643 } 644 } 645 646 /* 647 * Manages consolidation of flushes and submitting any flushes needed for 648 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is 649 * being finished in another context. Returns false if the flushing is 650 * complete but still needs the I/O portion of the bio to be processed. 651 */ 652 bool md_flush_request(struct mddev *mddev, struct bio *bio) 653 { 654 ktime_t start = ktime_get_boottime(); 655 spin_lock_irq(&mddev->lock); 656 wait_event_lock_irq(mddev->sb_wait, 657 !mddev->flush_bio || 658 ktime_after(mddev->last_flush, start), 659 mddev->lock); 660 if (!ktime_after(mddev->last_flush, start)) { 661 WARN_ON(mddev->flush_bio); 662 mddev->flush_bio = bio; 663 bio = NULL; 664 } 665 spin_unlock_irq(&mddev->lock); 666 667 if (!bio) { 668 INIT_WORK(&mddev->flush_work, submit_flushes); 669 queue_work(md_wq, &mddev->flush_work); 670 } else { 671 /* flush was performed for some other bio while we waited. */ 672 if (bio->bi_iter.bi_size == 0) 673 /* an empty barrier - all done */ 674 bio_endio(bio); 675 else { 676 bio->bi_opf &= ~REQ_PREFLUSH; 677 return false; 678 } 679 } 680 return true; 681 } 682 EXPORT_SYMBOL(md_flush_request); 683 684 static inline struct mddev *mddev_get(struct mddev *mddev) 685 { 686 atomic_inc(&mddev->active); 687 return mddev; 688 } 689 690 static void mddev_delayed_delete(struct work_struct *ws); 691 692 static void mddev_put(struct mddev *mddev) 693 { 694 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 695 return; 696 if (!mddev->raid_disks && list_empty(&mddev->disks) && 697 mddev->ctime == 0 && !mddev->hold_active) { 698 /* Array is not configured at all, and not held active, 699 * so destroy it */ 700 list_del_init(&mddev->all_mddevs); 701 702 /* 703 * Call queue_work inside the spinlock so that 704 * flush_workqueue() after mddev_find will succeed in waiting 705 * for the work to be done. 706 */ 707 INIT_WORK(&mddev->del_work, mddev_delayed_delete); 708 queue_work(md_misc_wq, &mddev->del_work); 709 } 710 spin_unlock(&all_mddevs_lock); 711 } 712 713 static void md_safemode_timeout(struct timer_list *t); 714 715 void mddev_init(struct mddev *mddev) 716 { 717 kobject_init(&mddev->kobj, &md_ktype); 718 mutex_init(&mddev->open_mutex); 719 mutex_init(&mddev->reconfig_mutex); 720 mutex_init(&mddev->bitmap_info.mutex); 721 INIT_LIST_HEAD(&mddev->disks); 722 INIT_LIST_HEAD(&mddev->all_mddevs); 723 timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0); 724 atomic_set(&mddev->active, 1); 725 atomic_set(&mddev->openers, 0); 726 atomic_set(&mddev->active_io, 0); 727 spin_lock_init(&mddev->lock); 728 atomic_set(&mddev->flush_pending, 0); 729 init_waitqueue_head(&mddev->sb_wait); 730 init_waitqueue_head(&mddev->recovery_wait); 731 mddev->reshape_position = MaxSector; 732 mddev->reshape_backwards = 0; 733 mddev->last_sync_action = "none"; 734 mddev->resync_min = 0; 735 mddev->resync_max = MaxSector; 736 mddev->level = LEVEL_NONE; 737 } 738 EXPORT_SYMBOL_GPL(mddev_init); 739 740 static struct mddev *mddev_find(dev_t unit) 741 { 742 struct mddev *mddev, *new = NULL; 743 744 if (unit && MAJOR(unit) != MD_MAJOR) 745 unit &= ~((1<<MdpMinorShift)-1); 746 747 retry: 748 spin_lock(&all_mddevs_lock); 749 750 if (unit) { 751 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 752 if (mddev->unit == unit) { 753 mddev_get(mddev); 754 spin_unlock(&all_mddevs_lock); 755 kfree(new); 756 return mddev; 757 } 758 759 if (new) { 760 list_add(&new->all_mddevs, &all_mddevs); 761 spin_unlock(&all_mddevs_lock); 762 new->hold_active = UNTIL_IOCTL; 763 return new; 764 } 765 } else if (new) { 766 /* find an unused unit number */ 767 static int next_minor = 512; 768 int start = next_minor; 769 int is_free = 0; 770 int dev = 0; 771 while (!is_free) { 772 dev = MKDEV(MD_MAJOR, next_minor); 773 next_minor++; 774 if (next_minor > MINORMASK) 775 next_minor = 0; 776 if (next_minor == start) { 777 /* Oh dear, all in use. */ 778 spin_unlock(&all_mddevs_lock); 779 kfree(new); 780 return NULL; 781 } 782 783 is_free = 1; 784 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 785 if (mddev->unit == dev) { 786 is_free = 0; 787 break; 788 } 789 } 790 new->unit = dev; 791 new->md_minor = MINOR(dev); 792 new->hold_active = UNTIL_STOP; 793 list_add(&new->all_mddevs, &all_mddevs); 794 spin_unlock(&all_mddevs_lock); 795 return new; 796 } 797 spin_unlock(&all_mddevs_lock); 798 799 new = kzalloc(sizeof(*new), GFP_KERNEL); 800 if (!new) 801 return NULL; 802 803 new->unit = unit; 804 if (MAJOR(unit) == MD_MAJOR) 805 new->md_minor = MINOR(unit); 806 else 807 new->md_minor = MINOR(unit) >> MdpMinorShift; 808 809 mddev_init(new); 810 811 goto retry; 812 } 813 814 static struct attribute_group md_redundancy_group; 815 816 void mddev_unlock(struct mddev *mddev) 817 { 818 if (mddev->to_remove) { 819 /* These cannot be removed under reconfig_mutex as 820 * an access to the files will try to take reconfig_mutex 821 * while holding the file unremovable, which leads to 822 * a deadlock. 823 * So hold set sysfs_active while the remove in happeing, 824 * and anything else which might set ->to_remove or my 825 * otherwise change the sysfs namespace will fail with 826 * -EBUSY if sysfs_active is still set. 827 * We set sysfs_active under reconfig_mutex and elsewhere 828 * test it under the same mutex to ensure its correct value 829 * is seen. 830 */ 831 struct attribute_group *to_remove = mddev->to_remove; 832 mddev->to_remove = NULL; 833 mddev->sysfs_active = 1; 834 mutex_unlock(&mddev->reconfig_mutex); 835 836 if (mddev->kobj.sd) { 837 if (to_remove != &md_redundancy_group) 838 sysfs_remove_group(&mddev->kobj, to_remove); 839 if (mddev->pers == NULL || 840 mddev->pers->sync_request == NULL) { 841 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 842 if (mddev->sysfs_action) 843 sysfs_put(mddev->sysfs_action); 844 mddev->sysfs_action = NULL; 845 } 846 } 847 mddev->sysfs_active = 0; 848 } else 849 mutex_unlock(&mddev->reconfig_mutex); 850 851 /* As we've dropped the mutex we need a spinlock to 852 * make sure the thread doesn't disappear 853 */ 854 spin_lock(&pers_lock); 855 md_wakeup_thread(mddev->thread); 856 wake_up(&mddev->sb_wait); 857 spin_unlock(&pers_lock); 858 } 859 EXPORT_SYMBOL_GPL(mddev_unlock); 860 861 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) 862 { 863 struct md_rdev *rdev; 864 865 rdev_for_each_rcu(rdev, mddev) 866 if (rdev->desc_nr == nr) 867 return rdev; 868 869 return NULL; 870 } 871 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); 872 873 static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) 874 { 875 struct md_rdev *rdev; 876 877 rdev_for_each(rdev, mddev) 878 if (rdev->bdev->bd_dev == dev) 879 return rdev; 880 881 return NULL; 882 } 883 884 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev) 885 { 886 struct md_rdev *rdev; 887 888 rdev_for_each_rcu(rdev, mddev) 889 if (rdev->bdev->bd_dev == dev) 890 return rdev; 891 892 return NULL; 893 } 894 EXPORT_SYMBOL_GPL(md_find_rdev_rcu); 895 896 static struct md_personality *find_pers(int level, char *clevel) 897 { 898 struct md_personality *pers; 899 list_for_each_entry(pers, &pers_list, list) { 900 if (level != LEVEL_NONE && pers->level == level) 901 return pers; 902 if (strcmp(pers->name, clevel)==0) 903 return pers; 904 } 905 return NULL; 906 } 907 908 /* return the offset of the super block in 512byte sectors */ 909 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) 910 { 911 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; 912 return MD_NEW_SIZE_SECTORS(num_sectors); 913 } 914 915 static int alloc_disk_sb(struct md_rdev *rdev) 916 { 917 rdev->sb_page = alloc_page(GFP_KERNEL); 918 if (!rdev->sb_page) 919 return -ENOMEM; 920 return 0; 921 } 922 923 void md_rdev_clear(struct md_rdev *rdev) 924 { 925 if (rdev->sb_page) { 926 put_page(rdev->sb_page); 927 rdev->sb_loaded = 0; 928 rdev->sb_page = NULL; 929 rdev->sb_start = 0; 930 rdev->sectors = 0; 931 } 932 if (rdev->bb_page) { 933 put_page(rdev->bb_page); 934 rdev->bb_page = NULL; 935 } 936 badblocks_exit(&rdev->badblocks); 937 } 938 EXPORT_SYMBOL_GPL(md_rdev_clear); 939 940 static void super_written(struct bio *bio) 941 { 942 struct md_rdev *rdev = bio->bi_private; 943 struct mddev *mddev = rdev->mddev; 944 945 if (bio->bi_status) { 946 pr_err("md: super_written gets error=%d\n", bio->bi_status); 947 md_error(mddev, rdev); 948 if (!test_bit(Faulty, &rdev->flags) 949 && (bio->bi_opf & MD_FAILFAST)) { 950 set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags); 951 set_bit(LastDev, &rdev->flags); 952 } 953 } else 954 clear_bit(LastDev, &rdev->flags); 955 956 if (atomic_dec_and_test(&mddev->pending_writes)) 957 wake_up(&mddev->sb_wait); 958 rdev_dec_pending(rdev, mddev); 959 bio_put(bio); 960 } 961 962 void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 963 sector_t sector, int size, struct page *page) 964 { 965 /* write first size bytes of page to sector of rdev 966 * Increment mddev->pending_writes before returning 967 * and decrement it on completion, waking up sb_wait 968 * if zero is reached. 969 * If an error occurred, call md_error 970 */ 971 struct bio *bio; 972 int ff = 0; 973 974 if (!page) 975 return; 976 977 if (test_bit(Faulty, &rdev->flags)) 978 return; 979 980 bio = md_bio_alloc_sync(mddev); 981 982 atomic_inc(&rdev->nr_pending); 983 984 bio_set_dev(bio, rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev); 985 bio->bi_iter.bi_sector = sector; 986 bio_add_page(bio, page, size, 0); 987 bio->bi_private = rdev; 988 bio->bi_end_io = super_written; 989 990 if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) && 991 test_bit(FailFast, &rdev->flags) && 992 !test_bit(LastDev, &rdev->flags)) 993 ff = MD_FAILFAST; 994 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff; 995 996 atomic_inc(&mddev->pending_writes); 997 submit_bio(bio); 998 } 999 1000 int md_super_wait(struct mddev *mddev) 1001 { 1002 /* wait for all superblock writes that were scheduled to complete */ 1003 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); 1004 if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags)) 1005 return -EAGAIN; 1006 return 0; 1007 } 1008 1009 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 1010 struct page *page, int op, int op_flags, bool metadata_op) 1011 { 1012 struct bio *bio = md_bio_alloc_sync(rdev->mddev); 1013 int ret; 1014 1015 if (metadata_op && rdev->meta_bdev) 1016 bio_set_dev(bio, rdev->meta_bdev); 1017 else 1018 bio_set_dev(bio, rdev->bdev); 1019 bio_set_op_attrs(bio, op, op_flags); 1020 if (metadata_op) 1021 bio->bi_iter.bi_sector = sector + rdev->sb_start; 1022 else if (rdev->mddev->reshape_position != MaxSector && 1023 (rdev->mddev->reshape_backwards == 1024 (sector >= rdev->mddev->reshape_position))) 1025 bio->bi_iter.bi_sector = sector + rdev->new_data_offset; 1026 else 1027 bio->bi_iter.bi_sector = sector + rdev->data_offset; 1028 bio_add_page(bio, page, size, 0); 1029 1030 submit_bio_wait(bio); 1031 1032 ret = !bio->bi_status; 1033 bio_put(bio); 1034 return ret; 1035 } 1036 EXPORT_SYMBOL_GPL(sync_page_io); 1037 1038 static int read_disk_sb(struct md_rdev *rdev, int size) 1039 { 1040 char b[BDEVNAME_SIZE]; 1041 1042 if (rdev->sb_loaded) 1043 return 0; 1044 1045 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) 1046 goto fail; 1047 rdev->sb_loaded = 1; 1048 return 0; 1049 1050 fail: 1051 pr_err("md: disabled device %s, could not read superblock.\n", 1052 bdevname(rdev->bdev,b)); 1053 return -EINVAL; 1054 } 1055 1056 static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 1057 { 1058 return sb1->set_uuid0 == sb2->set_uuid0 && 1059 sb1->set_uuid1 == sb2->set_uuid1 && 1060 sb1->set_uuid2 == sb2->set_uuid2 && 1061 sb1->set_uuid3 == sb2->set_uuid3; 1062 } 1063 1064 static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 1065 { 1066 int ret; 1067 mdp_super_t *tmp1, *tmp2; 1068 1069 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 1070 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 1071 1072 if (!tmp1 || !tmp2) { 1073 ret = 0; 1074 goto abort; 1075 } 1076 1077 *tmp1 = *sb1; 1078 *tmp2 = *sb2; 1079 1080 /* 1081 * nr_disks is not constant 1082 */ 1083 tmp1->nr_disks = 0; 1084 tmp2->nr_disks = 0; 1085 1086 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); 1087 abort: 1088 kfree(tmp1); 1089 kfree(tmp2); 1090 return ret; 1091 } 1092 1093 static u32 md_csum_fold(u32 csum) 1094 { 1095 csum = (csum & 0xffff) + (csum >> 16); 1096 return (csum & 0xffff) + (csum >> 16); 1097 } 1098 1099 static unsigned int calc_sb_csum(mdp_super_t *sb) 1100 { 1101 u64 newcsum = 0; 1102 u32 *sb32 = (u32*)sb; 1103 int i; 1104 unsigned int disk_csum, csum; 1105 1106 disk_csum = sb->sb_csum; 1107 sb->sb_csum = 0; 1108 1109 for (i = 0; i < MD_SB_BYTES/4 ; i++) 1110 newcsum += sb32[i]; 1111 csum = (newcsum & 0xffffffff) + (newcsum>>32); 1112 1113 #ifdef CONFIG_ALPHA 1114 /* This used to use csum_partial, which was wrong for several 1115 * reasons including that different results are returned on 1116 * different architectures. It isn't critical that we get exactly 1117 * the same return value as before (we always csum_fold before 1118 * testing, and that removes any differences). However as we 1119 * know that csum_partial always returned a 16bit value on 1120 * alphas, do a fold to maximise conformity to previous behaviour. 1121 */ 1122 sb->sb_csum = md_csum_fold(disk_csum); 1123 #else 1124 sb->sb_csum = disk_csum; 1125 #endif 1126 return csum; 1127 } 1128 1129 /* 1130 * Handle superblock details. 1131 * We want to be able to handle multiple superblock formats 1132 * so we have a common interface to them all, and an array of 1133 * different handlers. 1134 * We rely on user-space to write the initial superblock, and support 1135 * reading and updating of superblocks. 1136 * Interface methods are: 1137 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) 1138 * loads and validates a superblock on dev. 1139 * if refdev != NULL, compare superblocks on both devices 1140 * Return: 1141 * 0 - dev has a superblock that is compatible with refdev 1142 * 1 - dev has a superblock that is compatible and newer than refdev 1143 * so dev should be used as the refdev in future 1144 * -EINVAL superblock incompatible or invalid 1145 * -othererror e.g. -EIO 1146 * 1147 * int validate_super(struct mddev *mddev, struct md_rdev *dev) 1148 * Verify that dev is acceptable into mddev. 1149 * The first time, mddev->raid_disks will be 0, and data from 1150 * dev should be merged in. Subsequent calls check that dev 1151 * is new enough. Return 0 or -EINVAL 1152 * 1153 * void sync_super(struct mddev *mddev, struct md_rdev *dev) 1154 * Update the superblock for rdev with data in mddev 1155 * This does not write to disc. 1156 * 1157 */ 1158 1159 struct super_type { 1160 char *name; 1161 struct module *owner; 1162 int (*load_super)(struct md_rdev *rdev, 1163 struct md_rdev *refdev, 1164 int minor_version); 1165 int (*validate_super)(struct mddev *mddev, 1166 struct md_rdev *rdev); 1167 void (*sync_super)(struct mddev *mddev, 1168 struct md_rdev *rdev); 1169 unsigned long long (*rdev_size_change)(struct md_rdev *rdev, 1170 sector_t num_sectors); 1171 int (*allow_new_offset)(struct md_rdev *rdev, 1172 unsigned long long new_offset); 1173 }; 1174 1175 /* 1176 * Check that the given mddev has no bitmap. 1177 * 1178 * This function is called from the run method of all personalities that do not 1179 * support bitmaps. It prints an error message and returns non-zero if mddev 1180 * has a bitmap. Otherwise, it returns 0. 1181 * 1182 */ 1183 int md_check_no_bitmap(struct mddev *mddev) 1184 { 1185 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) 1186 return 0; 1187 pr_warn("%s: bitmaps are not supported for %s\n", 1188 mdname(mddev), mddev->pers->name); 1189 return 1; 1190 } 1191 EXPORT_SYMBOL(md_check_no_bitmap); 1192 1193 /* 1194 * load_super for 0.90.0 1195 */ 1196 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 1197 { 1198 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1199 mdp_super_t *sb; 1200 int ret; 1201 bool spare_disk = true; 1202 1203 /* 1204 * Calculate the position of the superblock (512byte sectors), 1205 * it's at the end of the disk. 1206 * 1207 * It also happens to be a multiple of 4Kb. 1208 */ 1209 rdev->sb_start = calc_dev_sboffset(rdev); 1210 1211 ret = read_disk_sb(rdev, MD_SB_BYTES); 1212 if (ret) 1213 return ret; 1214 1215 ret = -EINVAL; 1216 1217 bdevname(rdev->bdev, b); 1218 sb = page_address(rdev->sb_page); 1219 1220 if (sb->md_magic != MD_SB_MAGIC) { 1221 pr_warn("md: invalid raid superblock magic on %s\n", b); 1222 goto abort; 1223 } 1224 1225 if (sb->major_version != 0 || 1226 sb->minor_version < 90 || 1227 sb->minor_version > 91) { 1228 pr_warn("Bad version number %d.%d on %s\n", 1229 sb->major_version, sb->minor_version, b); 1230 goto abort; 1231 } 1232 1233 if (sb->raid_disks <= 0) 1234 goto abort; 1235 1236 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { 1237 pr_warn("md: invalid superblock checksum on %s\n", b); 1238 goto abort; 1239 } 1240 1241 rdev->preferred_minor = sb->md_minor; 1242 rdev->data_offset = 0; 1243 rdev->new_data_offset = 0; 1244 rdev->sb_size = MD_SB_BYTES; 1245 rdev->badblocks.shift = -1; 1246 1247 if (sb->level == LEVEL_MULTIPATH) 1248 rdev->desc_nr = -1; 1249 else 1250 rdev->desc_nr = sb->this_disk.number; 1251 1252 /* not spare disk, or LEVEL_MULTIPATH */ 1253 if (sb->level == LEVEL_MULTIPATH || 1254 (rdev->desc_nr >= 0 && 1255 rdev->desc_nr < MD_SB_DISKS && 1256 sb->disks[rdev->desc_nr].state & 1257 ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))) 1258 spare_disk = false; 1259 1260 if (!refdev) { 1261 if (!spare_disk) 1262 ret = 1; 1263 else 1264 ret = 0; 1265 } else { 1266 __u64 ev1, ev2; 1267 mdp_super_t *refsb = page_address(refdev->sb_page); 1268 if (!md_uuid_equal(refsb, sb)) { 1269 pr_warn("md: %s has different UUID to %s\n", 1270 b, bdevname(refdev->bdev,b2)); 1271 goto abort; 1272 } 1273 if (!md_sb_equal(refsb, sb)) { 1274 pr_warn("md: %s has same UUID but different superblock to %s\n", 1275 b, bdevname(refdev->bdev, b2)); 1276 goto abort; 1277 } 1278 ev1 = md_event(sb); 1279 ev2 = md_event(refsb); 1280 1281 if (!spare_disk && ev1 > ev2) 1282 ret = 1; 1283 else 1284 ret = 0; 1285 } 1286 rdev->sectors = rdev->sb_start; 1287 /* Limit to 4TB as metadata cannot record more than that. 1288 * (not needed for Linear and RAID0 as metadata doesn't 1289 * record this size) 1290 */ 1291 if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1) 1292 rdev->sectors = (sector_t)(2ULL << 32) - 2; 1293 1294 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) 1295 /* "this cannot possibly happen" ... */ 1296 ret = -EINVAL; 1297 1298 abort: 1299 return ret; 1300 } 1301 1302 /* 1303 * validate_super for 0.90.0 1304 */ 1305 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) 1306 { 1307 mdp_disk_t *desc; 1308 mdp_super_t *sb = page_address(rdev->sb_page); 1309 __u64 ev1 = md_event(sb); 1310 1311 rdev->raid_disk = -1; 1312 clear_bit(Faulty, &rdev->flags); 1313 clear_bit(In_sync, &rdev->flags); 1314 clear_bit(Bitmap_sync, &rdev->flags); 1315 clear_bit(WriteMostly, &rdev->flags); 1316 1317 if (mddev->raid_disks == 0) { 1318 mddev->major_version = 0; 1319 mddev->minor_version = sb->minor_version; 1320 mddev->patch_version = sb->patch_version; 1321 mddev->external = 0; 1322 mddev->chunk_sectors = sb->chunk_size >> 9; 1323 mddev->ctime = sb->ctime; 1324 mddev->utime = sb->utime; 1325 mddev->level = sb->level; 1326 mddev->clevel[0] = 0; 1327 mddev->layout = sb->layout; 1328 mddev->raid_disks = sb->raid_disks; 1329 mddev->dev_sectors = ((sector_t)sb->size) * 2; 1330 mddev->events = ev1; 1331 mddev->bitmap_info.offset = 0; 1332 mddev->bitmap_info.space = 0; 1333 /* bitmap can use 60 K after the 4K superblocks */ 1334 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 1335 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); 1336 mddev->reshape_backwards = 0; 1337 1338 if (mddev->minor_version >= 91) { 1339 mddev->reshape_position = sb->reshape_position; 1340 mddev->delta_disks = sb->delta_disks; 1341 mddev->new_level = sb->new_level; 1342 mddev->new_layout = sb->new_layout; 1343 mddev->new_chunk_sectors = sb->new_chunk >> 9; 1344 if (mddev->delta_disks < 0) 1345 mddev->reshape_backwards = 1; 1346 } else { 1347 mddev->reshape_position = MaxSector; 1348 mddev->delta_disks = 0; 1349 mddev->new_level = mddev->level; 1350 mddev->new_layout = mddev->layout; 1351 mddev->new_chunk_sectors = mddev->chunk_sectors; 1352 } 1353 if (mddev->level == 0) 1354 mddev->layout = -1; 1355 1356 if (sb->state & (1<<MD_SB_CLEAN)) 1357 mddev->recovery_cp = MaxSector; 1358 else { 1359 if (sb->events_hi == sb->cp_events_hi && 1360 sb->events_lo == sb->cp_events_lo) { 1361 mddev->recovery_cp = sb->recovery_cp; 1362 } else 1363 mddev->recovery_cp = 0; 1364 } 1365 1366 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 1367 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 1368 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 1369 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 1370 1371 mddev->max_disks = MD_SB_DISKS; 1372 1373 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 1374 mddev->bitmap_info.file == NULL) { 1375 mddev->bitmap_info.offset = 1376 mddev->bitmap_info.default_offset; 1377 mddev->bitmap_info.space = 1378 mddev->bitmap_info.default_space; 1379 } 1380 1381 } else if (mddev->pers == NULL) { 1382 /* Insist on good event counter while assembling, except 1383 * for spares (which don't need an event count) */ 1384 ++ev1; 1385 if (sb->disks[rdev->desc_nr].state & ( 1386 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) 1387 if (ev1 < mddev->events) 1388 return -EINVAL; 1389 } else if (mddev->bitmap) { 1390 /* if adding to array with a bitmap, then we can accept an 1391 * older device ... but not too old. 1392 */ 1393 if (ev1 < mddev->bitmap->events_cleared) 1394 return 0; 1395 if (ev1 < mddev->events) 1396 set_bit(Bitmap_sync, &rdev->flags); 1397 } else { 1398 if (ev1 < mddev->events) 1399 /* just a hot-add of a new device, leave raid_disk at -1 */ 1400 return 0; 1401 } 1402 1403 if (mddev->level != LEVEL_MULTIPATH) { 1404 desc = sb->disks + rdev->desc_nr; 1405 1406 if (desc->state & (1<<MD_DISK_FAULTY)) 1407 set_bit(Faulty, &rdev->flags); 1408 else if (desc->state & (1<<MD_DISK_SYNC) /* && 1409 desc->raid_disk < mddev->raid_disks */) { 1410 set_bit(In_sync, &rdev->flags); 1411 rdev->raid_disk = desc->raid_disk; 1412 rdev->saved_raid_disk = desc->raid_disk; 1413 } else if (desc->state & (1<<MD_DISK_ACTIVE)) { 1414 /* active but not in sync implies recovery up to 1415 * reshape position. We don't know exactly where 1416 * that is, so set to zero for now */ 1417 if (mddev->minor_version >= 91) { 1418 rdev->recovery_offset = 0; 1419 rdev->raid_disk = desc->raid_disk; 1420 } 1421 } 1422 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 1423 set_bit(WriteMostly, &rdev->flags); 1424 if (desc->state & (1<<MD_DISK_FAILFAST)) 1425 set_bit(FailFast, &rdev->flags); 1426 } else /* MULTIPATH are always insync */ 1427 set_bit(In_sync, &rdev->flags); 1428 return 0; 1429 } 1430 1431 /* 1432 * sync_super for 0.90.0 1433 */ 1434 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) 1435 { 1436 mdp_super_t *sb; 1437 struct md_rdev *rdev2; 1438 int next_spare = mddev->raid_disks; 1439 1440 /* make rdev->sb match mddev data.. 1441 * 1442 * 1/ zero out disks 1443 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 1444 * 3/ any empty disks < next_spare become removed 1445 * 1446 * disks[0] gets initialised to REMOVED because 1447 * we cannot be sure from other fields if it has 1448 * been initialised or not. 1449 */ 1450 int i; 1451 int active=0, working=0,failed=0,spare=0,nr_disks=0; 1452 1453 rdev->sb_size = MD_SB_BYTES; 1454 1455 sb = page_address(rdev->sb_page); 1456 1457 memset(sb, 0, sizeof(*sb)); 1458 1459 sb->md_magic = MD_SB_MAGIC; 1460 sb->major_version = mddev->major_version; 1461 sb->patch_version = mddev->patch_version; 1462 sb->gvalid_words = 0; /* ignored */ 1463 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 1464 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 1465 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 1466 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 1467 1468 sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); 1469 sb->level = mddev->level; 1470 sb->size = mddev->dev_sectors / 2; 1471 sb->raid_disks = mddev->raid_disks; 1472 sb->md_minor = mddev->md_minor; 1473 sb->not_persistent = 0; 1474 sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); 1475 sb->state = 0; 1476 sb->events_hi = (mddev->events>>32); 1477 sb->events_lo = (u32)mddev->events; 1478 1479 if (mddev->reshape_position == MaxSector) 1480 sb->minor_version = 90; 1481 else { 1482 sb->minor_version = 91; 1483 sb->reshape_position = mddev->reshape_position; 1484 sb->new_level = mddev->new_level; 1485 sb->delta_disks = mddev->delta_disks; 1486 sb->new_layout = mddev->new_layout; 1487 sb->new_chunk = mddev->new_chunk_sectors << 9; 1488 } 1489 mddev->minor_version = sb->minor_version; 1490 if (mddev->in_sync) 1491 { 1492 sb->recovery_cp = mddev->recovery_cp; 1493 sb->cp_events_hi = (mddev->events>>32); 1494 sb->cp_events_lo = (u32)mddev->events; 1495 if (mddev->recovery_cp == MaxSector) 1496 sb->state = (1<< MD_SB_CLEAN); 1497 } else 1498 sb->recovery_cp = 0; 1499 1500 sb->layout = mddev->layout; 1501 sb->chunk_size = mddev->chunk_sectors << 9; 1502 1503 if (mddev->bitmap && mddev->bitmap_info.file == NULL) 1504 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 1505 1506 sb->disks[0].state = (1<<MD_DISK_REMOVED); 1507 rdev_for_each(rdev2, mddev) { 1508 mdp_disk_t *d; 1509 int desc_nr; 1510 int is_active = test_bit(In_sync, &rdev2->flags); 1511 1512 if (rdev2->raid_disk >= 0 && 1513 sb->minor_version >= 91) 1514 /* we have nowhere to store the recovery_offset, 1515 * but if it is not below the reshape_position, 1516 * we can piggy-back on that. 1517 */ 1518 is_active = 1; 1519 if (rdev2->raid_disk < 0 || 1520 test_bit(Faulty, &rdev2->flags)) 1521 is_active = 0; 1522 if (is_active) 1523 desc_nr = rdev2->raid_disk; 1524 else 1525 desc_nr = next_spare++; 1526 rdev2->desc_nr = desc_nr; 1527 d = &sb->disks[rdev2->desc_nr]; 1528 nr_disks++; 1529 d->number = rdev2->desc_nr; 1530 d->major = MAJOR(rdev2->bdev->bd_dev); 1531 d->minor = MINOR(rdev2->bdev->bd_dev); 1532 if (is_active) 1533 d->raid_disk = rdev2->raid_disk; 1534 else 1535 d->raid_disk = rdev2->desc_nr; /* compatibility */ 1536 if (test_bit(Faulty, &rdev2->flags)) 1537 d->state = (1<<MD_DISK_FAULTY); 1538 else if (is_active) { 1539 d->state = (1<<MD_DISK_ACTIVE); 1540 if (test_bit(In_sync, &rdev2->flags)) 1541 d->state |= (1<<MD_DISK_SYNC); 1542 active++; 1543 working++; 1544 } else { 1545 d->state = 0; 1546 spare++; 1547 working++; 1548 } 1549 if (test_bit(WriteMostly, &rdev2->flags)) 1550 d->state |= (1<<MD_DISK_WRITEMOSTLY); 1551 if (test_bit(FailFast, &rdev2->flags)) 1552 d->state |= (1<<MD_DISK_FAILFAST); 1553 } 1554 /* now set the "removed" and "faulty" bits on any missing devices */ 1555 for (i=0 ; i < mddev->raid_disks ; i++) { 1556 mdp_disk_t *d = &sb->disks[i]; 1557 if (d->state == 0 && d->number == 0) { 1558 d->number = i; 1559 d->raid_disk = i; 1560 d->state = (1<<MD_DISK_REMOVED); 1561 d->state |= (1<<MD_DISK_FAULTY); 1562 failed++; 1563 } 1564 } 1565 sb->nr_disks = nr_disks; 1566 sb->active_disks = active; 1567 sb->working_disks = working; 1568 sb->failed_disks = failed; 1569 sb->spare_disks = spare; 1570 1571 sb->this_disk = sb->disks[rdev->desc_nr]; 1572 sb->sb_csum = calc_sb_csum(sb); 1573 } 1574 1575 /* 1576 * rdev_size_change for 0.90.0 1577 */ 1578 static unsigned long long 1579 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1580 { 1581 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1582 return 0; /* component must fit device */ 1583 if (rdev->mddev->bitmap_info.offset) 1584 return 0; /* can't move bitmap */ 1585 rdev->sb_start = calc_dev_sboffset(rdev); 1586 if (!num_sectors || num_sectors > rdev->sb_start) 1587 num_sectors = rdev->sb_start; 1588 /* Limit to 4TB as metadata cannot record more than that. 1589 * 4TB == 2^32 KB, or 2*2^32 sectors. 1590 */ 1591 if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) 1592 num_sectors = (sector_t)(2ULL << 32) - 2; 1593 do { 1594 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1595 rdev->sb_page); 1596 } while (md_super_wait(rdev->mddev) < 0); 1597 return num_sectors; 1598 } 1599 1600 static int 1601 super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) 1602 { 1603 /* non-zero offset changes not possible with v0.90 */ 1604 return new_offset == 0; 1605 } 1606 1607 /* 1608 * version 1 superblock 1609 */ 1610 1611 static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) 1612 { 1613 __le32 disk_csum; 1614 u32 csum; 1615 unsigned long long newcsum; 1616 int size = 256 + le32_to_cpu(sb->max_dev)*2; 1617 __le32 *isuper = (__le32*)sb; 1618 1619 disk_csum = sb->sb_csum; 1620 sb->sb_csum = 0; 1621 newcsum = 0; 1622 for (; size >= 4; size -= 4) 1623 newcsum += le32_to_cpu(*isuper++); 1624 1625 if (size == 2) 1626 newcsum += le16_to_cpu(*(__le16*) isuper); 1627 1628 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 1629 sb->sb_csum = disk_csum; 1630 return cpu_to_le32(csum); 1631 } 1632 1633 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 1634 { 1635 struct mdp_superblock_1 *sb; 1636 int ret; 1637 sector_t sb_start; 1638 sector_t sectors; 1639 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1640 int bmask; 1641 bool spare_disk = true; 1642 1643 /* 1644 * Calculate the position of the superblock in 512byte sectors. 1645 * It is always aligned to a 4K boundary and 1646 * depeding on minor_version, it can be: 1647 * 0: At least 8K, but less than 12K, from end of device 1648 * 1: At start of device 1649 * 2: 4K from start of device. 1650 */ 1651 switch(minor_version) { 1652 case 0: 1653 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; 1654 sb_start -= 8*2; 1655 sb_start &= ~(sector_t)(4*2-1); 1656 break; 1657 case 1: 1658 sb_start = 0; 1659 break; 1660 case 2: 1661 sb_start = 8; 1662 break; 1663 default: 1664 return -EINVAL; 1665 } 1666 rdev->sb_start = sb_start; 1667 1668 /* superblock is rarely larger than 1K, but it can be larger, 1669 * and it is safe to read 4k, so we do that 1670 */ 1671 ret = read_disk_sb(rdev, 4096); 1672 if (ret) return ret; 1673 1674 sb = page_address(rdev->sb_page); 1675 1676 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 1677 sb->major_version != cpu_to_le32(1) || 1678 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 1679 le64_to_cpu(sb->super_offset) != rdev->sb_start || 1680 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 1681 return -EINVAL; 1682 1683 if (calc_sb_1_csum(sb) != sb->sb_csum) { 1684 pr_warn("md: invalid superblock checksum on %s\n", 1685 bdevname(rdev->bdev,b)); 1686 return -EINVAL; 1687 } 1688 if (le64_to_cpu(sb->data_size) < 10) { 1689 pr_warn("md: data_size too small on %s\n", 1690 bdevname(rdev->bdev,b)); 1691 return -EINVAL; 1692 } 1693 if (sb->pad0 || 1694 sb->pad3[0] || 1695 memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) 1696 /* Some padding is non-zero, might be a new feature */ 1697 return -EINVAL; 1698 1699 rdev->preferred_minor = 0xffff; 1700 rdev->data_offset = le64_to_cpu(sb->data_offset); 1701 rdev->new_data_offset = rdev->data_offset; 1702 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && 1703 (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) 1704 rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); 1705 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); 1706 1707 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 1708 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1709 if (rdev->sb_size & bmask) 1710 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1711 1712 if (minor_version 1713 && rdev->data_offset < sb_start + (rdev->sb_size/512)) 1714 return -EINVAL; 1715 if (minor_version 1716 && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) 1717 return -EINVAL; 1718 1719 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) 1720 rdev->desc_nr = -1; 1721 else 1722 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1723 1724 if (!rdev->bb_page) { 1725 rdev->bb_page = alloc_page(GFP_KERNEL); 1726 if (!rdev->bb_page) 1727 return -ENOMEM; 1728 } 1729 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && 1730 rdev->badblocks.count == 0) { 1731 /* need to load the bad block list. 1732 * Currently we limit it to one page. 1733 */ 1734 s32 offset; 1735 sector_t bb_sector; 1736 __le64 *bbp; 1737 int i; 1738 int sectors = le16_to_cpu(sb->bblog_size); 1739 if (sectors > (PAGE_SIZE / 512)) 1740 return -EINVAL; 1741 offset = le32_to_cpu(sb->bblog_offset); 1742 if (offset == 0) 1743 return -EINVAL; 1744 bb_sector = (long long)offset; 1745 if (!sync_page_io(rdev, bb_sector, sectors << 9, 1746 rdev->bb_page, REQ_OP_READ, 0, true)) 1747 return -EIO; 1748 bbp = (__le64 *)page_address(rdev->bb_page); 1749 rdev->badblocks.shift = sb->bblog_shift; 1750 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { 1751 u64 bb = le64_to_cpu(*bbp); 1752 int count = bb & (0x3ff); 1753 u64 sector = bb >> 10; 1754 sector <<= sb->bblog_shift; 1755 count <<= sb->bblog_shift; 1756 if (bb + 1 == 0) 1757 break; 1758 if (badblocks_set(&rdev->badblocks, sector, count, 1)) 1759 return -EINVAL; 1760 } 1761 } else if (sb->bblog_offset != 0) 1762 rdev->badblocks.shift = 0; 1763 1764 if ((le32_to_cpu(sb->feature_map) & 1765 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) { 1766 rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset); 1767 rdev->ppl.size = le16_to_cpu(sb->ppl.size); 1768 rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset; 1769 } 1770 1771 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) && 1772 sb->level != 0) 1773 return -EINVAL; 1774 1775 /* not spare disk, or LEVEL_MULTIPATH */ 1776 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) || 1777 (rdev->desc_nr >= 0 && 1778 rdev->desc_nr < le32_to_cpu(sb->max_dev) && 1779 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || 1780 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))) 1781 spare_disk = false; 1782 1783 if (!refdev) { 1784 if (!spare_disk) 1785 ret = 1; 1786 else 1787 ret = 0; 1788 } else { 1789 __u64 ev1, ev2; 1790 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); 1791 1792 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 1793 sb->level != refsb->level || 1794 sb->layout != refsb->layout || 1795 sb->chunksize != refsb->chunksize) { 1796 pr_warn("md: %s has strangely different superblock to %s\n", 1797 bdevname(rdev->bdev,b), 1798 bdevname(refdev->bdev,b2)); 1799 return -EINVAL; 1800 } 1801 ev1 = le64_to_cpu(sb->events); 1802 ev2 = le64_to_cpu(refsb->events); 1803 1804 if (!spare_disk && ev1 > ev2) 1805 ret = 1; 1806 else 1807 ret = 0; 1808 } 1809 if (minor_version) { 1810 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); 1811 sectors -= rdev->data_offset; 1812 } else 1813 sectors = rdev->sb_start; 1814 if (sectors < le64_to_cpu(sb->data_size)) 1815 return -EINVAL; 1816 rdev->sectors = le64_to_cpu(sb->data_size); 1817 return ret; 1818 } 1819 1820 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) 1821 { 1822 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 1823 __u64 ev1 = le64_to_cpu(sb->events); 1824 1825 rdev->raid_disk = -1; 1826 clear_bit(Faulty, &rdev->flags); 1827 clear_bit(In_sync, &rdev->flags); 1828 clear_bit(Bitmap_sync, &rdev->flags); 1829 clear_bit(WriteMostly, &rdev->flags); 1830 1831 if (mddev->raid_disks == 0) { 1832 mddev->major_version = 1; 1833 mddev->patch_version = 0; 1834 mddev->external = 0; 1835 mddev->chunk_sectors = le32_to_cpu(sb->chunksize); 1836 mddev->ctime = le64_to_cpu(sb->ctime); 1837 mddev->utime = le64_to_cpu(sb->utime); 1838 mddev->level = le32_to_cpu(sb->level); 1839 mddev->clevel[0] = 0; 1840 mddev->layout = le32_to_cpu(sb->layout); 1841 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1842 mddev->dev_sectors = le64_to_cpu(sb->size); 1843 mddev->events = ev1; 1844 mddev->bitmap_info.offset = 0; 1845 mddev->bitmap_info.space = 0; 1846 /* Default location for bitmap is 1K after superblock 1847 * using 3K - total of 4K 1848 */ 1849 mddev->bitmap_info.default_offset = 1024 >> 9; 1850 mddev->bitmap_info.default_space = (4096-1024) >> 9; 1851 mddev->reshape_backwards = 0; 1852 1853 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1854 memcpy(mddev->uuid, sb->set_uuid, 16); 1855 1856 mddev->max_disks = (4096-256)/2; 1857 1858 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1859 mddev->bitmap_info.file == NULL) { 1860 mddev->bitmap_info.offset = 1861 (__s32)le32_to_cpu(sb->bitmap_offset); 1862 /* Metadata doesn't record how much space is available. 1863 * For 1.0, we assume we can use up to the superblock 1864 * if before, else to 4K beyond superblock. 1865 * For others, assume no change is possible. 1866 */ 1867 if (mddev->minor_version > 0) 1868 mddev->bitmap_info.space = 0; 1869 else if (mddev->bitmap_info.offset > 0) 1870 mddev->bitmap_info.space = 1871 8 - mddev->bitmap_info.offset; 1872 else 1873 mddev->bitmap_info.space = 1874 -mddev->bitmap_info.offset; 1875 } 1876 1877 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { 1878 mddev->reshape_position = le64_to_cpu(sb->reshape_position); 1879 mddev->delta_disks = le32_to_cpu(sb->delta_disks); 1880 mddev->new_level = le32_to_cpu(sb->new_level); 1881 mddev->new_layout = le32_to_cpu(sb->new_layout); 1882 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); 1883 if (mddev->delta_disks < 0 || 1884 (mddev->delta_disks == 0 && 1885 (le32_to_cpu(sb->feature_map) 1886 & MD_FEATURE_RESHAPE_BACKWARDS))) 1887 mddev->reshape_backwards = 1; 1888 } else { 1889 mddev->reshape_position = MaxSector; 1890 mddev->delta_disks = 0; 1891 mddev->new_level = mddev->level; 1892 mddev->new_layout = mddev->layout; 1893 mddev->new_chunk_sectors = mddev->chunk_sectors; 1894 } 1895 1896 if (mddev->level == 0 && 1897 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT)) 1898 mddev->layout = -1; 1899 1900 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) 1901 set_bit(MD_HAS_JOURNAL, &mddev->flags); 1902 1903 if (le32_to_cpu(sb->feature_map) & 1904 (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) { 1905 if (le32_to_cpu(sb->feature_map) & 1906 (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL)) 1907 return -EINVAL; 1908 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) && 1909 (le32_to_cpu(sb->feature_map) & 1910 MD_FEATURE_MULTIPLE_PPLS)) 1911 return -EINVAL; 1912 set_bit(MD_HAS_PPL, &mddev->flags); 1913 } 1914 } else if (mddev->pers == NULL) { 1915 /* Insist of good event counter while assembling, except for 1916 * spares (which don't need an event count) */ 1917 ++ev1; 1918 if (rdev->desc_nr >= 0 && 1919 rdev->desc_nr < le32_to_cpu(sb->max_dev) && 1920 (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || 1921 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) 1922 if (ev1 < mddev->events) 1923 return -EINVAL; 1924 } else if (mddev->bitmap) { 1925 /* If adding to array with a bitmap, then we can accept an 1926 * older device, but not too old. 1927 */ 1928 if (ev1 < mddev->bitmap->events_cleared) 1929 return 0; 1930 if (ev1 < mddev->events) 1931 set_bit(Bitmap_sync, &rdev->flags); 1932 } else { 1933 if (ev1 < mddev->events) 1934 /* just a hot-add of a new device, leave raid_disk at -1 */ 1935 return 0; 1936 } 1937 if (mddev->level != LEVEL_MULTIPATH) { 1938 int role; 1939 if (rdev->desc_nr < 0 || 1940 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { 1941 role = MD_DISK_ROLE_SPARE; 1942 rdev->desc_nr = -1; 1943 } else 1944 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1945 switch(role) { 1946 case MD_DISK_ROLE_SPARE: /* spare */ 1947 break; 1948 case MD_DISK_ROLE_FAULTY: /* faulty */ 1949 set_bit(Faulty, &rdev->flags); 1950 break; 1951 case MD_DISK_ROLE_JOURNAL: /* journal device */ 1952 if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { 1953 /* journal device without journal feature */ 1954 pr_warn("md: journal device provided without journal feature, ignoring the device\n"); 1955 return -EINVAL; 1956 } 1957 set_bit(Journal, &rdev->flags); 1958 rdev->journal_tail = le64_to_cpu(sb->journal_tail); 1959 rdev->raid_disk = 0; 1960 break; 1961 default: 1962 rdev->saved_raid_disk = role; 1963 if ((le32_to_cpu(sb->feature_map) & 1964 MD_FEATURE_RECOVERY_OFFSET)) { 1965 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 1966 if (!(le32_to_cpu(sb->feature_map) & 1967 MD_FEATURE_RECOVERY_BITMAP)) 1968 rdev->saved_raid_disk = -1; 1969 } else { 1970 /* 1971 * If the array is FROZEN, then the device can't 1972 * be in_sync with rest of array. 1973 */ 1974 if (!test_bit(MD_RECOVERY_FROZEN, 1975 &mddev->recovery)) 1976 set_bit(In_sync, &rdev->flags); 1977 } 1978 rdev->raid_disk = role; 1979 break; 1980 } 1981 if (sb->devflags & WriteMostly1) 1982 set_bit(WriteMostly, &rdev->flags); 1983 if (sb->devflags & FailFast1) 1984 set_bit(FailFast, &rdev->flags); 1985 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) 1986 set_bit(Replacement, &rdev->flags); 1987 } else /* MULTIPATH are always insync */ 1988 set_bit(In_sync, &rdev->flags); 1989 1990 return 0; 1991 } 1992 1993 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) 1994 { 1995 struct mdp_superblock_1 *sb; 1996 struct md_rdev *rdev2; 1997 int max_dev, i; 1998 /* make rdev->sb match mddev and rdev data. */ 1999 2000 sb = page_address(rdev->sb_page); 2001 2002 sb->feature_map = 0; 2003 sb->pad0 = 0; 2004 sb->recovery_offset = cpu_to_le64(0); 2005 memset(sb->pad3, 0, sizeof(sb->pad3)); 2006 2007 sb->utime = cpu_to_le64((__u64)mddev->utime); 2008 sb->events = cpu_to_le64(mddev->events); 2009 if (mddev->in_sync) 2010 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 2011 else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) 2012 sb->resync_offset = cpu_to_le64(MaxSector); 2013 else 2014 sb->resync_offset = cpu_to_le64(0); 2015 2016 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); 2017 2018 sb->raid_disks = cpu_to_le32(mddev->raid_disks); 2019 sb->size = cpu_to_le64(mddev->dev_sectors); 2020 sb->chunksize = cpu_to_le32(mddev->chunk_sectors); 2021 sb->level = cpu_to_le32(mddev->level); 2022 sb->layout = cpu_to_le32(mddev->layout); 2023 if (test_bit(FailFast, &rdev->flags)) 2024 sb->devflags |= FailFast1; 2025 else 2026 sb->devflags &= ~FailFast1; 2027 2028 if (test_bit(WriteMostly, &rdev->flags)) 2029 sb->devflags |= WriteMostly1; 2030 else 2031 sb->devflags &= ~WriteMostly1; 2032 sb->data_offset = cpu_to_le64(rdev->data_offset); 2033 sb->data_size = cpu_to_le64(rdev->sectors); 2034 2035 if (mddev->bitmap && mddev->bitmap_info.file == NULL) { 2036 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); 2037 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 2038 } 2039 2040 if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && 2041 !test_bit(In_sync, &rdev->flags)) { 2042 sb->feature_map |= 2043 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); 2044 sb->recovery_offset = 2045 cpu_to_le64(rdev->recovery_offset); 2046 if (rdev->saved_raid_disk >= 0 && mddev->bitmap) 2047 sb->feature_map |= 2048 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); 2049 } 2050 /* Note: recovery_offset and journal_tail share space */ 2051 if (test_bit(Journal, &rdev->flags)) 2052 sb->journal_tail = cpu_to_le64(rdev->journal_tail); 2053 if (test_bit(Replacement, &rdev->flags)) 2054 sb->feature_map |= 2055 cpu_to_le32(MD_FEATURE_REPLACEMENT); 2056 2057 if (mddev->reshape_position != MaxSector) { 2058 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); 2059 sb->reshape_position = cpu_to_le64(mddev->reshape_position); 2060 sb->new_layout = cpu_to_le32(mddev->new_layout); 2061 sb->delta_disks = cpu_to_le32(mddev->delta_disks); 2062 sb->new_level = cpu_to_le32(mddev->new_level); 2063 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); 2064 if (mddev->delta_disks == 0 && 2065 mddev->reshape_backwards) 2066 sb->feature_map 2067 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); 2068 if (rdev->new_data_offset != rdev->data_offset) { 2069 sb->feature_map 2070 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); 2071 sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset 2072 - rdev->data_offset)); 2073 } 2074 } 2075 2076 if (mddev_is_clustered(mddev)) 2077 sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); 2078 2079 if (rdev->badblocks.count == 0) 2080 /* Nothing to do for bad blocks*/ ; 2081 else if (sb->bblog_offset == 0) 2082 /* Cannot record bad blocks on this device */ 2083 md_error(mddev, rdev); 2084 else { 2085 struct badblocks *bb = &rdev->badblocks; 2086 __le64 *bbp = (__le64 *)page_address(rdev->bb_page); 2087 u64 *p = bb->page; 2088 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); 2089 if (bb->changed) { 2090 unsigned seq; 2091 2092 retry: 2093 seq = read_seqbegin(&bb->lock); 2094 2095 memset(bbp, 0xff, PAGE_SIZE); 2096 2097 for (i = 0 ; i < bb->count ; i++) { 2098 u64 internal_bb = p[i]; 2099 u64 store_bb = ((BB_OFFSET(internal_bb) << 10) 2100 | BB_LEN(internal_bb)); 2101 bbp[i] = cpu_to_le64(store_bb); 2102 } 2103 bb->changed = 0; 2104 if (read_seqretry(&bb->lock, seq)) 2105 goto retry; 2106 2107 bb->sector = (rdev->sb_start + 2108 (int)le32_to_cpu(sb->bblog_offset)); 2109 bb->size = le16_to_cpu(sb->bblog_size); 2110 } 2111 } 2112 2113 max_dev = 0; 2114 rdev_for_each(rdev2, mddev) 2115 if (rdev2->desc_nr+1 > max_dev) 2116 max_dev = rdev2->desc_nr+1; 2117 2118 if (max_dev > le32_to_cpu(sb->max_dev)) { 2119 int bmask; 2120 sb->max_dev = cpu_to_le32(max_dev); 2121 rdev->sb_size = max_dev * 2 + 256; 2122 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 2123 if (rdev->sb_size & bmask) 2124 rdev->sb_size = (rdev->sb_size | bmask) + 1; 2125 } else 2126 max_dev = le32_to_cpu(sb->max_dev); 2127 2128 for (i=0; i<max_dev;i++) 2129 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); 2130 2131 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) 2132 sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); 2133 2134 if (test_bit(MD_HAS_PPL, &mddev->flags)) { 2135 if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags)) 2136 sb->feature_map |= 2137 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS); 2138 else 2139 sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL); 2140 sb->ppl.offset = cpu_to_le16(rdev->ppl.offset); 2141 sb->ppl.size = cpu_to_le16(rdev->ppl.size); 2142 } 2143 2144 rdev_for_each(rdev2, mddev) { 2145 i = rdev2->desc_nr; 2146 if (test_bit(Faulty, &rdev2->flags)) 2147 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); 2148 else if (test_bit(In_sync, &rdev2->flags)) 2149 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 2150 else if (test_bit(Journal, &rdev2->flags)) 2151 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); 2152 else if (rdev2->raid_disk >= 0) 2153 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 2154 else 2155 sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); 2156 } 2157 2158 sb->sb_csum = calc_sb_1_csum(sb); 2159 } 2160 2161 static unsigned long long 2162 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 2163 { 2164 struct mdp_superblock_1 *sb; 2165 sector_t max_sectors; 2166 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 2167 return 0; /* component must fit device */ 2168 if (rdev->data_offset != rdev->new_data_offset) 2169 return 0; /* too confusing */ 2170 if (rdev->sb_start < rdev->data_offset) { 2171 /* minor versions 1 and 2; superblock before data */ 2172 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; 2173 max_sectors -= rdev->data_offset; 2174 if (!num_sectors || num_sectors > max_sectors) 2175 num_sectors = max_sectors; 2176 } else if (rdev->mddev->bitmap_info.offset) { 2177 /* minor version 0 with bitmap we can't move */ 2178 return 0; 2179 } else { 2180 /* minor version 0; superblock after data */ 2181 sector_t sb_start; 2182 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; 2183 sb_start &= ~(sector_t)(4*2 - 1); 2184 max_sectors = rdev->sectors + sb_start - rdev->sb_start; 2185 if (!num_sectors || num_sectors > max_sectors) 2186 num_sectors = max_sectors; 2187 rdev->sb_start = sb_start; 2188 } 2189 sb = page_address(rdev->sb_page); 2190 sb->data_size = cpu_to_le64(num_sectors); 2191 sb->super_offset = cpu_to_le64(rdev->sb_start); 2192 sb->sb_csum = calc_sb_1_csum(sb); 2193 do { 2194 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 2195 rdev->sb_page); 2196 } while (md_super_wait(rdev->mddev) < 0); 2197 return num_sectors; 2198 2199 } 2200 2201 static int 2202 super_1_allow_new_offset(struct md_rdev *rdev, 2203 unsigned long long new_offset) 2204 { 2205 /* All necessary checks on new >= old have been done */ 2206 struct bitmap *bitmap; 2207 if (new_offset >= rdev->data_offset) 2208 return 1; 2209 2210 /* with 1.0 metadata, there is no metadata to tread on 2211 * so we can always move back */ 2212 if (rdev->mddev->minor_version == 0) 2213 return 1; 2214 2215 /* otherwise we must be sure not to step on 2216 * any metadata, so stay: 2217 * 36K beyond start of superblock 2218 * beyond end of badblocks 2219 * beyond write-intent bitmap 2220 */ 2221 if (rdev->sb_start + (32+4)*2 > new_offset) 2222 return 0; 2223 bitmap = rdev->mddev->bitmap; 2224 if (bitmap && !rdev->mddev->bitmap_info.file && 2225 rdev->sb_start + rdev->mddev->bitmap_info.offset + 2226 bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) 2227 return 0; 2228 if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) 2229 return 0; 2230 2231 return 1; 2232 } 2233 2234 static struct super_type super_types[] = { 2235 [0] = { 2236 .name = "0.90.0", 2237 .owner = THIS_MODULE, 2238 .load_super = super_90_load, 2239 .validate_super = super_90_validate, 2240 .sync_super = super_90_sync, 2241 .rdev_size_change = super_90_rdev_size_change, 2242 .allow_new_offset = super_90_allow_new_offset, 2243 }, 2244 [1] = { 2245 .name = "md-1", 2246 .owner = THIS_MODULE, 2247 .load_super = super_1_load, 2248 .validate_super = super_1_validate, 2249 .sync_super = super_1_sync, 2250 .rdev_size_change = super_1_rdev_size_change, 2251 .allow_new_offset = super_1_allow_new_offset, 2252 }, 2253 }; 2254 2255 static void sync_super(struct mddev *mddev, struct md_rdev *rdev) 2256 { 2257 if (mddev->sync_super) { 2258 mddev->sync_super(mddev, rdev); 2259 return; 2260 } 2261 2262 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); 2263 2264 super_types[mddev->major_version].sync_super(mddev, rdev); 2265 } 2266 2267 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) 2268 { 2269 struct md_rdev *rdev, *rdev2; 2270 2271 rcu_read_lock(); 2272 rdev_for_each_rcu(rdev, mddev1) { 2273 if (test_bit(Faulty, &rdev->flags) || 2274 test_bit(Journal, &rdev->flags) || 2275 rdev->raid_disk == -1) 2276 continue; 2277 rdev_for_each_rcu(rdev2, mddev2) { 2278 if (test_bit(Faulty, &rdev2->flags) || 2279 test_bit(Journal, &rdev2->flags) || 2280 rdev2->raid_disk == -1) 2281 continue; 2282 if (rdev->bdev->bd_contains == 2283 rdev2->bdev->bd_contains) { 2284 rcu_read_unlock(); 2285 return 1; 2286 } 2287 } 2288 } 2289 rcu_read_unlock(); 2290 return 0; 2291 } 2292 2293 static LIST_HEAD(pending_raid_disks); 2294 2295 /* 2296 * Try to register data integrity profile for an mddev 2297 * 2298 * This is called when an array is started and after a disk has been kicked 2299 * from the array. It only succeeds if all working and active component devices 2300 * are integrity capable with matching profiles. 2301 */ 2302 int md_integrity_register(struct mddev *mddev) 2303 { 2304 struct md_rdev *rdev, *reference = NULL; 2305 2306 if (list_empty(&mddev->disks)) 2307 return 0; /* nothing to do */ 2308 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) 2309 return 0; /* shouldn't register, or already is */ 2310 rdev_for_each(rdev, mddev) { 2311 /* skip spares and non-functional disks */ 2312 if (test_bit(Faulty, &rdev->flags)) 2313 continue; 2314 if (rdev->raid_disk < 0) 2315 continue; 2316 if (!reference) { 2317 /* Use the first rdev as the reference */ 2318 reference = rdev; 2319 continue; 2320 } 2321 /* does this rdev's profile match the reference profile? */ 2322 if (blk_integrity_compare(reference->bdev->bd_disk, 2323 rdev->bdev->bd_disk) < 0) 2324 return -EINVAL; 2325 } 2326 if (!reference || !bdev_get_integrity(reference->bdev)) 2327 return 0; 2328 /* 2329 * All component devices are integrity capable and have matching 2330 * profiles, register the common profile for the md device. 2331 */ 2332 blk_integrity_register(mddev->gendisk, 2333 bdev_get_integrity(reference->bdev)); 2334 2335 pr_debug("md: data integrity enabled on %s\n", mdname(mddev)); 2336 if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) { 2337 pr_err("md: failed to create integrity pool for %s\n", 2338 mdname(mddev)); 2339 return -EINVAL; 2340 } 2341 return 0; 2342 } 2343 EXPORT_SYMBOL(md_integrity_register); 2344 2345 /* 2346 * Attempt to add an rdev, but only if it is consistent with the current 2347 * integrity profile 2348 */ 2349 int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) 2350 { 2351 struct blk_integrity *bi_mddev; 2352 char name[BDEVNAME_SIZE]; 2353 2354 if (!mddev->gendisk) 2355 return 0; 2356 2357 bi_mddev = blk_get_integrity(mddev->gendisk); 2358 2359 if (!bi_mddev) /* nothing to do */ 2360 return 0; 2361 2362 if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) { 2363 pr_err("%s: incompatible integrity profile for %s\n", 2364 mdname(mddev), bdevname(rdev->bdev, name)); 2365 return -ENXIO; 2366 } 2367 2368 return 0; 2369 } 2370 EXPORT_SYMBOL(md_integrity_add_rdev); 2371 2372 static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) 2373 { 2374 char b[BDEVNAME_SIZE]; 2375 struct kobject *ko; 2376 int err; 2377 2378 /* prevent duplicates */ 2379 if (find_rdev(mddev, rdev->bdev->bd_dev)) 2380 return -EEXIST; 2381 2382 if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) && 2383 mddev->pers) 2384 return -EROFS; 2385 2386 /* make sure rdev->sectors exceeds mddev->dev_sectors */ 2387 if (!test_bit(Journal, &rdev->flags) && 2388 rdev->sectors && 2389 (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) { 2390 if (mddev->pers) { 2391 /* Cannot change size, so fail 2392 * If mddev->level <= 0, then we don't care 2393 * about aligning sizes (e.g. linear) 2394 */ 2395 if (mddev->level > 0) 2396 return -ENOSPC; 2397 } else 2398 mddev->dev_sectors = rdev->sectors; 2399 } 2400 2401 /* Verify rdev->desc_nr is unique. 2402 * If it is -1, assign a free number, else 2403 * check number is not in use 2404 */ 2405 rcu_read_lock(); 2406 if (rdev->desc_nr < 0) { 2407 int choice = 0; 2408 if (mddev->pers) 2409 choice = mddev->raid_disks; 2410 while (md_find_rdev_nr_rcu(mddev, choice)) 2411 choice++; 2412 rdev->desc_nr = choice; 2413 } else { 2414 if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { 2415 rcu_read_unlock(); 2416 return -EBUSY; 2417 } 2418 } 2419 rcu_read_unlock(); 2420 if (!test_bit(Journal, &rdev->flags) && 2421 mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { 2422 pr_warn("md: %s: array is limited to %d devices\n", 2423 mdname(mddev), mddev->max_disks); 2424 return -EBUSY; 2425 } 2426 bdevname(rdev->bdev,b); 2427 strreplace(b, '/', '!'); 2428 2429 rdev->mddev = mddev; 2430 pr_debug("md: bind<%s>\n", b); 2431 2432 if (mddev->raid_disks) 2433 mddev_create_serial_pool(mddev, rdev, false); 2434 2435 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) 2436 goto fail; 2437 2438 ko = &part_to_dev(rdev->bdev->bd_part)->kobj; 2439 if (sysfs_create_link(&rdev->kobj, ko, "block")) 2440 /* failure here is OK */; 2441 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); 2442 2443 list_add_rcu(&rdev->same_set, &mddev->disks); 2444 bd_link_disk_holder(rdev->bdev, mddev->gendisk); 2445 2446 /* May as well allow recovery to be retried once */ 2447 mddev->recovery_disabled++; 2448 2449 return 0; 2450 2451 fail: 2452 pr_warn("md: failed to register dev-%s for %s\n", 2453 b, mdname(mddev)); 2454 return err; 2455 } 2456 2457 static void md_delayed_delete(struct work_struct *ws) 2458 { 2459 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); 2460 kobject_del(&rdev->kobj); 2461 kobject_put(&rdev->kobj); 2462 } 2463 2464 static void unbind_rdev_from_array(struct md_rdev *rdev) 2465 { 2466 char b[BDEVNAME_SIZE]; 2467 2468 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); 2469 list_del_rcu(&rdev->same_set); 2470 pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b)); 2471 mddev_destroy_serial_pool(rdev->mddev, rdev, false); 2472 rdev->mddev = NULL; 2473 sysfs_remove_link(&rdev->kobj, "block"); 2474 sysfs_put(rdev->sysfs_state); 2475 rdev->sysfs_state = NULL; 2476 rdev->badblocks.count = 0; 2477 /* We need to delay this, otherwise we can deadlock when 2478 * writing to 'remove' to "dev/state". We also need 2479 * to delay it due to rcu usage. 2480 */ 2481 synchronize_rcu(); 2482 INIT_WORK(&rdev->del_work, md_delayed_delete); 2483 kobject_get(&rdev->kobj); 2484 queue_work(md_misc_wq, &rdev->del_work); 2485 } 2486 2487 /* 2488 * prevent the device from being mounted, repartitioned or 2489 * otherwise reused by a RAID array (or any other kernel 2490 * subsystem), by bd_claiming the device. 2491 */ 2492 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) 2493 { 2494 int err = 0; 2495 struct block_device *bdev; 2496 2497 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 2498 shared ? (struct md_rdev *)lock_rdev : rdev); 2499 if (IS_ERR(bdev)) { 2500 pr_warn("md: could not open device unknown-block(%u,%u).\n", 2501 MAJOR(dev), MINOR(dev)); 2502 return PTR_ERR(bdev); 2503 } 2504 rdev->bdev = bdev; 2505 return err; 2506 } 2507 2508 static void unlock_rdev(struct md_rdev *rdev) 2509 { 2510 struct block_device *bdev = rdev->bdev; 2511 rdev->bdev = NULL; 2512 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 2513 } 2514 2515 void md_autodetect_dev(dev_t dev); 2516 2517 static void export_rdev(struct md_rdev *rdev) 2518 { 2519 char b[BDEVNAME_SIZE]; 2520 2521 pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b)); 2522 md_rdev_clear(rdev); 2523 #ifndef MODULE 2524 if (test_bit(AutoDetected, &rdev->flags)) 2525 md_autodetect_dev(rdev->bdev->bd_dev); 2526 #endif 2527 unlock_rdev(rdev); 2528 kobject_put(&rdev->kobj); 2529 } 2530 2531 void md_kick_rdev_from_array(struct md_rdev *rdev) 2532 { 2533 unbind_rdev_from_array(rdev); 2534 export_rdev(rdev); 2535 } 2536 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); 2537 2538 static void export_array(struct mddev *mddev) 2539 { 2540 struct md_rdev *rdev; 2541 2542 while (!list_empty(&mddev->disks)) { 2543 rdev = list_first_entry(&mddev->disks, struct md_rdev, 2544 same_set); 2545 md_kick_rdev_from_array(rdev); 2546 } 2547 mddev->raid_disks = 0; 2548 mddev->major_version = 0; 2549 } 2550 2551 static bool set_in_sync(struct mddev *mddev) 2552 { 2553 lockdep_assert_held(&mddev->lock); 2554 if (!mddev->in_sync) { 2555 mddev->sync_checkers++; 2556 spin_unlock(&mddev->lock); 2557 percpu_ref_switch_to_atomic_sync(&mddev->writes_pending); 2558 spin_lock(&mddev->lock); 2559 if (!mddev->in_sync && 2560 percpu_ref_is_zero(&mddev->writes_pending)) { 2561 mddev->in_sync = 1; 2562 /* 2563 * Ensure ->in_sync is visible before we clear 2564 * ->sync_checkers. 2565 */ 2566 smp_mb(); 2567 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 2568 sysfs_notify_dirent_safe(mddev->sysfs_state); 2569 } 2570 if (--mddev->sync_checkers == 0) 2571 percpu_ref_switch_to_percpu(&mddev->writes_pending); 2572 } 2573 if (mddev->safemode == 1) 2574 mddev->safemode = 0; 2575 return mddev->in_sync; 2576 } 2577 2578 static void sync_sbs(struct mddev *mddev, int nospares) 2579 { 2580 /* Update each superblock (in-memory image), but 2581 * if we are allowed to, skip spares which already 2582 * have the right event counter, or have one earlier 2583 * (which would mean they aren't being marked as dirty 2584 * with the rest of the array) 2585 */ 2586 struct md_rdev *rdev; 2587 rdev_for_each(rdev, mddev) { 2588 if (rdev->sb_events == mddev->events || 2589 (nospares && 2590 rdev->raid_disk < 0 && 2591 rdev->sb_events+1 == mddev->events)) { 2592 /* Don't update this superblock */ 2593 rdev->sb_loaded = 2; 2594 } else { 2595 sync_super(mddev, rdev); 2596 rdev->sb_loaded = 1; 2597 } 2598 } 2599 } 2600 2601 static bool does_sb_need_changing(struct mddev *mddev) 2602 { 2603 struct md_rdev *rdev; 2604 struct mdp_superblock_1 *sb; 2605 int role; 2606 2607 /* Find a good rdev */ 2608 rdev_for_each(rdev, mddev) 2609 if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) 2610 break; 2611 2612 /* No good device found. */ 2613 if (!rdev) 2614 return false; 2615 2616 sb = page_address(rdev->sb_page); 2617 /* Check if a device has become faulty or a spare become active */ 2618 rdev_for_each(rdev, mddev) { 2619 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 2620 /* Device activated? */ 2621 if (role == 0xffff && rdev->raid_disk >=0 && 2622 !test_bit(Faulty, &rdev->flags)) 2623 return true; 2624 /* Device turned faulty? */ 2625 if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) 2626 return true; 2627 } 2628 2629 /* Check if any mddev parameters have changed */ 2630 if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || 2631 (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || 2632 (mddev->layout != le32_to_cpu(sb->layout)) || 2633 (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || 2634 (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) 2635 return true; 2636 2637 return false; 2638 } 2639 2640 void md_update_sb(struct mddev *mddev, int force_change) 2641 { 2642 struct md_rdev *rdev; 2643 int sync_req; 2644 int nospares = 0; 2645 int any_badblocks_changed = 0; 2646 int ret = -1; 2647 2648 if (mddev->ro) { 2649 if (force_change) 2650 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2651 return; 2652 } 2653 2654 repeat: 2655 if (mddev_is_clustered(mddev)) { 2656 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) 2657 force_change = 1; 2658 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) 2659 nospares = 1; 2660 ret = md_cluster_ops->metadata_update_start(mddev); 2661 /* Has someone else has updated the sb */ 2662 if (!does_sb_need_changing(mddev)) { 2663 if (ret == 0) 2664 md_cluster_ops->metadata_update_cancel(mddev); 2665 bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), 2666 BIT(MD_SB_CHANGE_DEVS) | 2667 BIT(MD_SB_CHANGE_CLEAN)); 2668 return; 2669 } 2670 } 2671 2672 /* 2673 * First make sure individual recovery_offsets are correct 2674 * curr_resync_completed can only be used during recovery. 2675 * During reshape/resync it might use array-addresses rather 2676 * that device addresses. 2677 */ 2678 rdev_for_each(rdev, mddev) { 2679 if (rdev->raid_disk >= 0 && 2680 mddev->delta_disks >= 0 && 2681 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 2682 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) && 2683 !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 2684 !test_bit(Journal, &rdev->flags) && 2685 !test_bit(In_sync, &rdev->flags) && 2686 mddev->curr_resync_completed > rdev->recovery_offset) 2687 rdev->recovery_offset = mddev->curr_resync_completed; 2688 2689 } 2690 if (!mddev->persistent) { 2691 clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 2692 clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2693 if (!mddev->external) { 2694 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 2695 rdev_for_each(rdev, mddev) { 2696 if (rdev->badblocks.changed) { 2697 rdev->badblocks.changed = 0; 2698 ack_all_badblocks(&rdev->badblocks); 2699 md_error(mddev, rdev); 2700 } 2701 clear_bit(Blocked, &rdev->flags); 2702 clear_bit(BlockedBadBlocks, &rdev->flags); 2703 wake_up(&rdev->blocked_wait); 2704 } 2705 } 2706 wake_up(&mddev->sb_wait); 2707 return; 2708 } 2709 2710 spin_lock(&mddev->lock); 2711 2712 mddev->utime = ktime_get_real_seconds(); 2713 2714 if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) 2715 force_change = 1; 2716 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) 2717 /* just a clean<-> dirty transition, possibly leave spares alone, 2718 * though if events isn't the right even/odd, we will have to do 2719 * spares after all 2720 */ 2721 nospares = 1; 2722 if (force_change) 2723 nospares = 0; 2724 if (mddev->degraded) 2725 /* If the array is degraded, then skipping spares is both 2726 * dangerous and fairly pointless. 2727 * Dangerous because a device that was removed from the array 2728 * might have a event_count that still looks up-to-date, 2729 * so it can be re-added without a resync. 2730 * Pointless because if there are any spares to skip, 2731 * then a recovery will happen and soon that array won't 2732 * be degraded any more and the spare can go back to sleep then. 2733 */ 2734 nospares = 0; 2735 2736 sync_req = mddev->in_sync; 2737 2738 /* If this is just a dirty<->clean transition, and the array is clean 2739 * and 'events' is odd, we can roll back to the previous clean state */ 2740 if (nospares 2741 && (mddev->in_sync && mddev->recovery_cp == MaxSector) 2742 && mddev->can_decrease_events 2743 && mddev->events != 1) { 2744 mddev->events--; 2745 mddev->can_decrease_events = 0; 2746 } else { 2747 /* otherwise we have to go forward and ... */ 2748 mddev->events ++; 2749 mddev->can_decrease_events = nospares; 2750 } 2751 2752 /* 2753 * This 64-bit counter should never wrap. 2754 * Either we are in around ~1 trillion A.C., assuming 2755 * 1 reboot per second, or we have a bug... 2756 */ 2757 WARN_ON(mddev->events == 0); 2758 2759 rdev_for_each(rdev, mddev) { 2760 if (rdev->badblocks.changed) 2761 any_badblocks_changed++; 2762 if (test_bit(Faulty, &rdev->flags)) 2763 set_bit(FaultRecorded, &rdev->flags); 2764 } 2765 2766 sync_sbs(mddev, nospares); 2767 spin_unlock(&mddev->lock); 2768 2769 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", 2770 mdname(mddev), mddev->in_sync); 2771 2772 if (mddev->queue) 2773 blk_add_trace_msg(mddev->queue, "md md_update_sb"); 2774 rewrite: 2775 md_bitmap_update_sb(mddev->bitmap); 2776 rdev_for_each(rdev, mddev) { 2777 char b[BDEVNAME_SIZE]; 2778 2779 if (rdev->sb_loaded != 1) 2780 continue; /* no noise on spare devices */ 2781 2782 if (!test_bit(Faulty, &rdev->flags)) { 2783 md_super_write(mddev,rdev, 2784 rdev->sb_start, rdev->sb_size, 2785 rdev->sb_page); 2786 pr_debug("md: (write) %s's sb offset: %llu\n", 2787 bdevname(rdev->bdev, b), 2788 (unsigned long long)rdev->sb_start); 2789 rdev->sb_events = mddev->events; 2790 if (rdev->badblocks.size) { 2791 md_super_write(mddev, rdev, 2792 rdev->badblocks.sector, 2793 rdev->badblocks.size << 9, 2794 rdev->bb_page); 2795 rdev->badblocks.size = 0; 2796 } 2797 2798 } else 2799 pr_debug("md: %s (skipping faulty)\n", 2800 bdevname(rdev->bdev, b)); 2801 2802 if (mddev->level == LEVEL_MULTIPATH) 2803 /* only need to write one superblock... */ 2804 break; 2805 } 2806 if (md_super_wait(mddev) < 0) 2807 goto rewrite; 2808 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */ 2809 2810 if (mddev_is_clustered(mddev) && ret == 0) 2811 md_cluster_ops->metadata_update_finish(mddev); 2812 2813 if (mddev->in_sync != sync_req || 2814 !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), 2815 BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN))) 2816 /* have to write it out again */ 2817 goto repeat; 2818 wake_up(&mddev->sb_wait); 2819 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 2820 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 2821 2822 rdev_for_each(rdev, mddev) { 2823 if (test_and_clear_bit(FaultRecorded, &rdev->flags)) 2824 clear_bit(Blocked, &rdev->flags); 2825 2826 if (any_badblocks_changed) 2827 ack_all_badblocks(&rdev->badblocks); 2828 clear_bit(BlockedBadBlocks, &rdev->flags); 2829 wake_up(&rdev->blocked_wait); 2830 } 2831 } 2832 EXPORT_SYMBOL(md_update_sb); 2833 2834 static int add_bound_rdev(struct md_rdev *rdev) 2835 { 2836 struct mddev *mddev = rdev->mddev; 2837 int err = 0; 2838 bool add_journal = test_bit(Journal, &rdev->flags); 2839 2840 if (!mddev->pers->hot_remove_disk || add_journal) { 2841 /* If there is hot_add_disk but no hot_remove_disk 2842 * then added disks for geometry changes, 2843 * and should be added immediately. 2844 */ 2845 super_types[mddev->major_version]. 2846 validate_super(mddev, rdev); 2847 if (add_journal) 2848 mddev_suspend(mddev); 2849 err = mddev->pers->hot_add_disk(mddev, rdev); 2850 if (add_journal) 2851 mddev_resume(mddev); 2852 if (err) { 2853 md_kick_rdev_from_array(rdev); 2854 return err; 2855 } 2856 } 2857 sysfs_notify_dirent_safe(rdev->sysfs_state); 2858 2859 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2860 if (mddev->degraded) 2861 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 2862 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2863 md_new_event(mddev); 2864 md_wakeup_thread(mddev->thread); 2865 return 0; 2866 } 2867 2868 /* words written to sysfs files may, or may not, be \n terminated. 2869 * We want to accept with case. For this we use cmd_match. 2870 */ 2871 static int cmd_match(const char *cmd, const char *str) 2872 { 2873 /* See if cmd, written into a sysfs file, matches 2874 * str. They must either be the same, or cmd can 2875 * have a trailing newline 2876 */ 2877 while (*cmd && *str && *cmd == *str) { 2878 cmd++; 2879 str++; 2880 } 2881 if (*cmd == '\n') 2882 cmd++; 2883 if (*str || *cmd) 2884 return 0; 2885 return 1; 2886 } 2887 2888 struct rdev_sysfs_entry { 2889 struct attribute attr; 2890 ssize_t (*show)(struct md_rdev *, char *); 2891 ssize_t (*store)(struct md_rdev *, const char *, size_t); 2892 }; 2893 2894 static ssize_t 2895 state_show(struct md_rdev *rdev, char *page) 2896 { 2897 char *sep = ","; 2898 size_t len = 0; 2899 unsigned long flags = READ_ONCE(rdev->flags); 2900 2901 if (test_bit(Faulty, &flags) || 2902 (!test_bit(ExternalBbl, &flags) && 2903 rdev->badblocks.unacked_exist)) 2904 len += sprintf(page+len, "faulty%s", sep); 2905 if (test_bit(In_sync, &flags)) 2906 len += sprintf(page+len, "in_sync%s", sep); 2907 if (test_bit(Journal, &flags)) 2908 len += sprintf(page+len, "journal%s", sep); 2909 if (test_bit(WriteMostly, &flags)) 2910 len += sprintf(page+len, "write_mostly%s", sep); 2911 if (test_bit(Blocked, &flags) || 2912 (rdev->badblocks.unacked_exist 2913 && !test_bit(Faulty, &flags))) 2914 len += sprintf(page+len, "blocked%s", sep); 2915 if (!test_bit(Faulty, &flags) && 2916 !test_bit(Journal, &flags) && 2917 !test_bit(In_sync, &flags)) 2918 len += sprintf(page+len, "spare%s", sep); 2919 if (test_bit(WriteErrorSeen, &flags)) 2920 len += sprintf(page+len, "write_error%s", sep); 2921 if (test_bit(WantReplacement, &flags)) 2922 len += sprintf(page+len, "want_replacement%s", sep); 2923 if (test_bit(Replacement, &flags)) 2924 len += sprintf(page+len, "replacement%s", sep); 2925 if (test_bit(ExternalBbl, &flags)) 2926 len += sprintf(page+len, "external_bbl%s", sep); 2927 if (test_bit(FailFast, &flags)) 2928 len += sprintf(page+len, "failfast%s", sep); 2929 2930 if (len) 2931 len -= strlen(sep); 2932 2933 return len+sprintf(page+len, "\n"); 2934 } 2935 2936 static ssize_t 2937 state_store(struct md_rdev *rdev, const char *buf, size_t len) 2938 { 2939 /* can write 2940 * faulty - simulates an error 2941 * remove - disconnects the device 2942 * writemostly - sets write_mostly 2943 * -writemostly - clears write_mostly 2944 * blocked - sets the Blocked flags 2945 * -blocked - clears the Blocked and possibly simulates an error 2946 * insync - sets Insync providing device isn't active 2947 * -insync - clear Insync for a device with a slot assigned, 2948 * so that it gets rebuilt based on bitmap 2949 * write_error - sets WriteErrorSeen 2950 * -write_error - clears WriteErrorSeen 2951 * {,-}failfast - set/clear FailFast 2952 */ 2953 int err = -EINVAL; 2954 if (cmd_match(buf, "faulty") && rdev->mddev->pers) { 2955 md_error(rdev->mddev, rdev); 2956 if (test_bit(Faulty, &rdev->flags)) 2957 err = 0; 2958 else 2959 err = -EBUSY; 2960 } else if (cmd_match(buf, "remove")) { 2961 if (rdev->mddev->pers) { 2962 clear_bit(Blocked, &rdev->flags); 2963 remove_and_add_spares(rdev->mddev, rdev); 2964 } 2965 if (rdev->raid_disk >= 0) 2966 err = -EBUSY; 2967 else { 2968 struct mddev *mddev = rdev->mddev; 2969 err = 0; 2970 if (mddev_is_clustered(mddev)) 2971 err = md_cluster_ops->remove_disk(mddev, rdev); 2972 2973 if (err == 0) { 2974 md_kick_rdev_from_array(rdev); 2975 if (mddev->pers) { 2976 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2977 md_wakeup_thread(mddev->thread); 2978 } 2979 md_new_event(mddev); 2980 } 2981 } 2982 } else if (cmd_match(buf, "writemostly")) { 2983 set_bit(WriteMostly, &rdev->flags); 2984 mddev_create_serial_pool(rdev->mddev, rdev, false); 2985 err = 0; 2986 } else if (cmd_match(buf, "-writemostly")) { 2987 mddev_destroy_serial_pool(rdev->mddev, rdev, false); 2988 clear_bit(WriteMostly, &rdev->flags); 2989 err = 0; 2990 } else if (cmd_match(buf, "blocked")) { 2991 set_bit(Blocked, &rdev->flags); 2992 err = 0; 2993 } else if (cmd_match(buf, "-blocked")) { 2994 if (!test_bit(Faulty, &rdev->flags) && 2995 !test_bit(ExternalBbl, &rdev->flags) && 2996 rdev->badblocks.unacked_exist) { 2997 /* metadata handler doesn't understand badblocks, 2998 * so we need to fail the device 2999 */ 3000 md_error(rdev->mddev, rdev); 3001 } 3002 clear_bit(Blocked, &rdev->flags); 3003 clear_bit(BlockedBadBlocks, &rdev->flags); 3004 wake_up(&rdev->blocked_wait); 3005 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 3006 md_wakeup_thread(rdev->mddev->thread); 3007 3008 err = 0; 3009 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { 3010 set_bit(In_sync, &rdev->flags); 3011 err = 0; 3012 } else if (cmd_match(buf, "failfast")) { 3013 set_bit(FailFast, &rdev->flags); 3014 err = 0; 3015 } else if (cmd_match(buf, "-failfast")) { 3016 clear_bit(FailFast, &rdev->flags); 3017 err = 0; 3018 } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && 3019 !test_bit(Journal, &rdev->flags)) { 3020 if (rdev->mddev->pers == NULL) { 3021 clear_bit(In_sync, &rdev->flags); 3022 rdev->saved_raid_disk = rdev->raid_disk; 3023 rdev->raid_disk = -1; 3024 err = 0; 3025 } 3026 } else if (cmd_match(buf, "write_error")) { 3027 set_bit(WriteErrorSeen, &rdev->flags); 3028 err = 0; 3029 } else if (cmd_match(buf, "-write_error")) { 3030 clear_bit(WriteErrorSeen, &rdev->flags); 3031 err = 0; 3032 } else if (cmd_match(buf, "want_replacement")) { 3033 /* Any non-spare device that is not a replacement can 3034 * become want_replacement at any time, but we then need to 3035 * check if recovery is needed. 3036 */ 3037 if (rdev->raid_disk >= 0 && 3038 !test_bit(Journal, &rdev->flags) && 3039 !test_bit(Replacement, &rdev->flags)) 3040 set_bit(WantReplacement, &rdev->flags); 3041 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 3042 md_wakeup_thread(rdev->mddev->thread); 3043 err = 0; 3044 } else if (cmd_match(buf, "-want_replacement")) { 3045 /* Clearing 'want_replacement' is always allowed. 3046 * Once replacements starts it is too late though. 3047 */ 3048 err = 0; 3049 clear_bit(WantReplacement, &rdev->flags); 3050 } else if (cmd_match(buf, "replacement")) { 3051 /* Can only set a device as a replacement when array has not 3052 * yet been started. Once running, replacement is automatic 3053 * from spares, or by assigning 'slot'. 3054 */ 3055 if (rdev->mddev->pers) 3056 err = -EBUSY; 3057 else { 3058 set_bit(Replacement, &rdev->flags); 3059 err = 0; 3060 } 3061 } else if (cmd_match(buf, "-replacement")) { 3062 /* Similarly, can only clear Replacement before start */ 3063 if (rdev->mddev->pers) 3064 err = -EBUSY; 3065 else { 3066 clear_bit(Replacement, &rdev->flags); 3067 err = 0; 3068 } 3069 } else if (cmd_match(buf, "re-add")) { 3070 if (!rdev->mddev->pers) 3071 err = -EINVAL; 3072 else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) && 3073 rdev->saved_raid_disk >= 0) { 3074 /* clear_bit is performed _after_ all the devices 3075 * have their local Faulty bit cleared. If any writes 3076 * happen in the meantime in the local node, they 3077 * will land in the local bitmap, which will be synced 3078 * by this node eventually 3079 */ 3080 if (!mddev_is_clustered(rdev->mddev) || 3081 (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { 3082 clear_bit(Faulty, &rdev->flags); 3083 err = add_bound_rdev(rdev); 3084 } 3085 } else 3086 err = -EBUSY; 3087 } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) { 3088 set_bit(ExternalBbl, &rdev->flags); 3089 rdev->badblocks.shift = 0; 3090 err = 0; 3091 } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) { 3092 clear_bit(ExternalBbl, &rdev->flags); 3093 err = 0; 3094 } 3095 if (!err) 3096 sysfs_notify_dirent_safe(rdev->sysfs_state); 3097 return err ? err : len; 3098 } 3099 static struct rdev_sysfs_entry rdev_state = 3100 __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); 3101 3102 static ssize_t 3103 errors_show(struct md_rdev *rdev, char *page) 3104 { 3105 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); 3106 } 3107 3108 static ssize_t 3109 errors_store(struct md_rdev *rdev, const char *buf, size_t len) 3110 { 3111 unsigned int n; 3112 int rv; 3113 3114 rv = kstrtouint(buf, 10, &n); 3115 if (rv < 0) 3116 return rv; 3117 atomic_set(&rdev->corrected_errors, n); 3118 return len; 3119 } 3120 static struct rdev_sysfs_entry rdev_errors = 3121 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); 3122 3123 static ssize_t 3124 slot_show(struct md_rdev *rdev, char *page) 3125 { 3126 if (test_bit(Journal, &rdev->flags)) 3127 return sprintf(page, "journal\n"); 3128 else if (rdev->raid_disk < 0) 3129 return sprintf(page, "none\n"); 3130 else 3131 return sprintf(page, "%d\n", rdev->raid_disk); 3132 } 3133 3134 static ssize_t 3135 slot_store(struct md_rdev *rdev, const char *buf, size_t len) 3136 { 3137 int slot; 3138 int err; 3139 3140 if (test_bit(Journal, &rdev->flags)) 3141 return -EBUSY; 3142 if (strncmp(buf, "none", 4)==0) 3143 slot = -1; 3144 else { 3145 err = kstrtouint(buf, 10, (unsigned int *)&slot); 3146 if (err < 0) 3147 return err; 3148 } 3149 if (rdev->mddev->pers && slot == -1) { 3150 /* Setting 'slot' on an active array requires also 3151 * updating the 'rd%d' link, and communicating 3152 * with the personality with ->hot_*_disk. 3153 * For now we only support removing 3154 * failed/spare devices. This normally happens automatically, 3155 * but not when the metadata is externally managed. 3156 */ 3157 if (rdev->raid_disk == -1) 3158 return -EEXIST; 3159 /* personality does all needed checks */ 3160 if (rdev->mddev->pers->hot_remove_disk == NULL) 3161 return -EINVAL; 3162 clear_bit(Blocked, &rdev->flags); 3163 remove_and_add_spares(rdev->mddev, rdev); 3164 if (rdev->raid_disk >= 0) 3165 return -EBUSY; 3166 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 3167 md_wakeup_thread(rdev->mddev->thread); 3168 } else if (rdev->mddev->pers) { 3169 /* Activating a spare .. or possibly reactivating 3170 * if we ever get bitmaps working here. 3171 */ 3172 int err; 3173 3174 if (rdev->raid_disk != -1) 3175 return -EBUSY; 3176 3177 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) 3178 return -EBUSY; 3179 3180 if (rdev->mddev->pers->hot_add_disk == NULL) 3181 return -EINVAL; 3182 3183 if (slot >= rdev->mddev->raid_disks && 3184 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 3185 return -ENOSPC; 3186 3187 rdev->raid_disk = slot; 3188 if (test_bit(In_sync, &rdev->flags)) 3189 rdev->saved_raid_disk = slot; 3190 else 3191 rdev->saved_raid_disk = -1; 3192 clear_bit(In_sync, &rdev->flags); 3193 clear_bit(Bitmap_sync, &rdev->flags); 3194 err = rdev->mddev->pers-> 3195 hot_add_disk(rdev->mddev, rdev); 3196 if (err) { 3197 rdev->raid_disk = -1; 3198 return err; 3199 } else 3200 sysfs_notify_dirent_safe(rdev->sysfs_state); 3201 if (sysfs_link_rdev(rdev->mddev, rdev)) 3202 /* failure here is OK */; 3203 /* don't wakeup anyone, leave that to userspace. */ 3204 } else { 3205 if (slot >= rdev->mddev->raid_disks && 3206 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 3207 return -ENOSPC; 3208 rdev->raid_disk = slot; 3209 /* assume it is working */ 3210 clear_bit(Faulty, &rdev->flags); 3211 clear_bit(WriteMostly, &rdev->flags); 3212 set_bit(In_sync, &rdev->flags); 3213 sysfs_notify_dirent_safe(rdev->sysfs_state); 3214 } 3215 return len; 3216 } 3217 3218 static struct rdev_sysfs_entry rdev_slot = 3219 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); 3220 3221 static ssize_t 3222 offset_show(struct md_rdev *rdev, char *page) 3223 { 3224 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); 3225 } 3226 3227 static ssize_t 3228 offset_store(struct md_rdev *rdev, const char *buf, size_t len) 3229 { 3230 unsigned long long offset; 3231 if (kstrtoull(buf, 10, &offset) < 0) 3232 return -EINVAL; 3233 if (rdev->mddev->pers && rdev->raid_disk >= 0) 3234 return -EBUSY; 3235 if (rdev->sectors && rdev->mddev->external) 3236 /* Must set offset before size, so overlap checks 3237 * can be sane */ 3238 return -EBUSY; 3239 rdev->data_offset = offset; 3240 rdev->new_data_offset = offset; 3241 return len; 3242 } 3243 3244 static struct rdev_sysfs_entry rdev_offset = 3245 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); 3246 3247 static ssize_t new_offset_show(struct md_rdev *rdev, char *page) 3248 { 3249 return sprintf(page, "%llu\n", 3250 (unsigned long long)rdev->new_data_offset); 3251 } 3252 3253 static ssize_t new_offset_store(struct md_rdev *rdev, 3254 const char *buf, size_t len) 3255 { 3256 unsigned long long new_offset; 3257 struct mddev *mddev = rdev->mddev; 3258 3259 if (kstrtoull(buf, 10, &new_offset) < 0) 3260 return -EINVAL; 3261 3262 if (mddev->sync_thread || 3263 test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) 3264 return -EBUSY; 3265 if (new_offset == rdev->data_offset) 3266 /* reset is always permitted */ 3267 ; 3268 else if (new_offset > rdev->data_offset) { 3269 /* must not push array size beyond rdev_sectors */ 3270 if (new_offset - rdev->data_offset 3271 + mddev->dev_sectors > rdev->sectors) 3272 return -E2BIG; 3273 } 3274 /* Metadata worries about other space details. */ 3275 3276 /* decreasing the offset is inconsistent with a backwards 3277 * reshape. 3278 */ 3279 if (new_offset < rdev->data_offset && 3280 mddev->reshape_backwards) 3281 return -EINVAL; 3282 /* Increasing offset is inconsistent with forwards 3283 * reshape. reshape_direction should be set to 3284 * 'backwards' first. 3285 */ 3286 if (new_offset > rdev->data_offset && 3287 !mddev->reshape_backwards) 3288 return -EINVAL; 3289 3290 if (mddev->pers && mddev->persistent && 3291 !super_types[mddev->major_version] 3292 .allow_new_offset(rdev, new_offset)) 3293 return -E2BIG; 3294 rdev->new_data_offset = new_offset; 3295 if (new_offset > rdev->data_offset) 3296 mddev->reshape_backwards = 1; 3297 else if (new_offset < rdev->data_offset) 3298 mddev->reshape_backwards = 0; 3299 3300 return len; 3301 } 3302 static struct rdev_sysfs_entry rdev_new_offset = 3303 __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); 3304 3305 static ssize_t 3306 rdev_size_show(struct md_rdev *rdev, char *page) 3307 { 3308 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); 3309 } 3310 3311 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) 3312 { 3313 /* check if two start/length pairs overlap */ 3314 if (s1+l1 <= s2) 3315 return 0; 3316 if (s2+l2 <= s1) 3317 return 0; 3318 return 1; 3319 } 3320 3321 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) 3322 { 3323 unsigned long long blocks; 3324 sector_t new; 3325 3326 if (kstrtoull(buf, 10, &blocks) < 0) 3327 return -EINVAL; 3328 3329 if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) 3330 return -EINVAL; /* sector conversion overflow */ 3331 3332 new = blocks * 2; 3333 if (new != blocks * 2) 3334 return -EINVAL; /* unsigned long long to sector_t overflow */ 3335 3336 *sectors = new; 3337 return 0; 3338 } 3339 3340 static ssize_t 3341 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) 3342 { 3343 struct mddev *my_mddev = rdev->mddev; 3344 sector_t oldsectors = rdev->sectors; 3345 sector_t sectors; 3346 3347 if (test_bit(Journal, &rdev->flags)) 3348 return -EBUSY; 3349 if (strict_blocks_to_sectors(buf, §ors) < 0) 3350 return -EINVAL; 3351 if (rdev->data_offset != rdev->new_data_offset) 3352 return -EINVAL; /* too confusing */ 3353 if (my_mddev->pers && rdev->raid_disk >= 0) { 3354 if (my_mddev->persistent) { 3355 sectors = super_types[my_mddev->major_version]. 3356 rdev_size_change(rdev, sectors); 3357 if (!sectors) 3358 return -EBUSY; 3359 } else if (!sectors) 3360 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - 3361 rdev->data_offset; 3362 if (!my_mddev->pers->resize) 3363 /* Cannot change size for RAID0 or Linear etc */ 3364 return -EINVAL; 3365 } 3366 if (sectors < my_mddev->dev_sectors) 3367 return -EINVAL; /* component must fit device */ 3368 3369 rdev->sectors = sectors; 3370 if (sectors > oldsectors && my_mddev->external) { 3371 /* Need to check that all other rdevs with the same 3372 * ->bdev do not overlap. 'rcu' is sufficient to walk 3373 * the rdev lists safely. 3374 * This check does not provide a hard guarantee, it 3375 * just helps avoid dangerous mistakes. 3376 */ 3377 struct mddev *mddev; 3378 int overlap = 0; 3379 struct list_head *tmp; 3380 3381 rcu_read_lock(); 3382 for_each_mddev(mddev, tmp) { 3383 struct md_rdev *rdev2; 3384 3385 rdev_for_each(rdev2, mddev) 3386 if (rdev->bdev == rdev2->bdev && 3387 rdev != rdev2 && 3388 overlaps(rdev->data_offset, rdev->sectors, 3389 rdev2->data_offset, 3390 rdev2->sectors)) { 3391 overlap = 1; 3392 break; 3393 } 3394 if (overlap) { 3395 mddev_put(mddev); 3396 break; 3397 } 3398 } 3399 rcu_read_unlock(); 3400 if (overlap) { 3401 /* Someone else could have slipped in a size 3402 * change here, but doing so is just silly. 3403 * We put oldsectors back because we *know* it is 3404 * safe, and trust userspace not to race with 3405 * itself 3406 */ 3407 rdev->sectors = oldsectors; 3408 return -EBUSY; 3409 } 3410 } 3411 return len; 3412 } 3413 3414 static struct rdev_sysfs_entry rdev_size = 3415 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); 3416 3417 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) 3418 { 3419 unsigned long long recovery_start = rdev->recovery_offset; 3420 3421 if (test_bit(In_sync, &rdev->flags) || 3422 recovery_start == MaxSector) 3423 return sprintf(page, "none\n"); 3424 3425 return sprintf(page, "%llu\n", recovery_start); 3426 } 3427 3428 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) 3429 { 3430 unsigned long long recovery_start; 3431 3432 if (cmd_match(buf, "none")) 3433 recovery_start = MaxSector; 3434 else if (kstrtoull(buf, 10, &recovery_start)) 3435 return -EINVAL; 3436 3437 if (rdev->mddev->pers && 3438 rdev->raid_disk >= 0) 3439 return -EBUSY; 3440 3441 rdev->recovery_offset = recovery_start; 3442 if (recovery_start == MaxSector) 3443 set_bit(In_sync, &rdev->flags); 3444 else 3445 clear_bit(In_sync, &rdev->flags); 3446 return len; 3447 } 3448 3449 static struct rdev_sysfs_entry rdev_recovery_start = 3450 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); 3451 3452 /* sysfs access to bad-blocks list. 3453 * We present two files. 3454 * 'bad-blocks' lists sector numbers and lengths of ranges that 3455 * are recorded as bad. The list is truncated to fit within 3456 * the one-page limit of sysfs. 3457 * Writing "sector length" to this file adds an acknowledged 3458 * bad block list. 3459 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet 3460 * been acknowledged. Writing to this file adds bad blocks 3461 * without acknowledging them. This is largely for testing. 3462 */ 3463 static ssize_t bb_show(struct md_rdev *rdev, char *page) 3464 { 3465 return badblocks_show(&rdev->badblocks, page, 0); 3466 } 3467 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) 3468 { 3469 int rv = badblocks_store(&rdev->badblocks, page, len, 0); 3470 /* Maybe that ack was all we needed */ 3471 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) 3472 wake_up(&rdev->blocked_wait); 3473 return rv; 3474 } 3475 static struct rdev_sysfs_entry rdev_bad_blocks = 3476 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); 3477 3478 static ssize_t ubb_show(struct md_rdev *rdev, char *page) 3479 { 3480 return badblocks_show(&rdev->badblocks, page, 1); 3481 } 3482 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) 3483 { 3484 return badblocks_store(&rdev->badblocks, page, len, 1); 3485 } 3486 static struct rdev_sysfs_entry rdev_unack_bad_blocks = 3487 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); 3488 3489 static ssize_t 3490 ppl_sector_show(struct md_rdev *rdev, char *page) 3491 { 3492 return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector); 3493 } 3494 3495 static ssize_t 3496 ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len) 3497 { 3498 unsigned long long sector; 3499 3500 if (kstrtoull(buf, 10, §or) < 0) 3501 return -EINVAL; 3502 if (sector != (sector_t)sector) 3503 return -EINVAL; 3504 3505 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && 3506 rdev->raid_disk >= 0) 3507 return -EBUSY; 3508 3509 if (rdev->mddev->persistent) { 3510 if (rdev->mddev->major_version == 0) 3511 return -EINVAL; 3512 if ((sector > rdev->sb_start && 3513 sector - rdev->sb_start > S16_MAX) || 3514 (sector < rdev->sb_start && 3515 rdev->sb_start - sector > -S16_MIN)) 3516 return -EINVAL; 3517 rdev->ppl.offset = sector - rdev->sb_start; 3518 } else if (!rdev->mddev->external) { 3519 return -EBUSY; 3520 } 3521 rdev->ppl.sector = sector; 3522 return len; 3523 } 3524 3525 static struct rdev_sysfs_entry rdev_ppl_sector = 3526 __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store); 3527 3528 static ssize_t 3529 ppl_size_show(struct md_rdev *rdev, char *page) 3530 { 3531 return sprintf(page, "%u\n", rdev->ppl.size); 3532 } 3533 3534 static ssize_t 3535 ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len) 3536 { 3537 unsigned int size; 3538 3539 if (kstrtouint(buf, 10, &size) < 0) 3540 return -EINVAL; 3541 3542 if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && 3543 rdev->raid_disk >= 0) 3544 return -EBUSY; 3545 3546 if (rdev->mddev->persistent) { 3547 if (rdev->mddev->major_version == 0) 3548 return -EINVAL; 3549 if (size > U16_MAX) 3550 return -EINVAL; 3551 } else if (!rdev->mddev->external) { 3552 return -EBUSY; 3553 } 3554 rdev->ppl.size = size; 3555 return len; 3556 } 3557 3558 static struct rdev_sysfs_entry rdev_ppl_size = 3559 __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store); 3560 3561 static struct attribute *rdev_default_attrs[] = { 3562 &rdev_state.attr, 3563 &rdev_errors.attr, 3564 &rdev_slot.attr, 3565 &rdev_offset.attr, 3566 &rdev_new_offset.attr, 3567 &rdev_size.attr, 3568 &rdev_recovery_start.attr, 3569 &rdev_bad_blocks.attr, 3570 &rdev_unack_bad_blocks.attr, 3571 &rdev_ppl_sector.attr, 3572 &rdev_ppl_size.attr, 3573 NULL, 3574 }; 3575 static ssize_t 3576 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 3577 { 3578 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 3579 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 3580 3581 if (!entry->show) 3582 return -EIO; 3583 if (!rdev->mddev) 3584 return -ENODEV; 3585 return entry->show(rdev, page); 3586 } 3587 3588 static ssize_t 3589 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 3590 const char *page, size_t length) 3591 { 3592 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 3593 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 3594 ssize_t rv; 3595 struct mddev *mddev = rdev->mddev; 3596 3597 if (!entry->store) 3598 return -EIO; 3599 if (!capable(CAP_SYS_ADMIN)) 3600 return -EACCES; 3601 rv = mddev ? mddev_lock(mddev) : -ENODEV; 3602 if (!rv) { 3603 if (rdev->mddev == NULL) 3604 rv = -ENODEV; 3605 else 3606 rv = entry->store(rdev, page, length); 3607 mddev_unlock(mddev); 3608 } 3609 return rv; 3610 } 3611 3612 static void rdev_free(struct kobject *ko) 3613 { 3614 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); 3615 kfree(rdev); 3616 } 3617 static const struct sysfs_ops rdev_sysfs_ops = { 3618 .show = rdev_attr_show, 3619 .store = rdev_attr_store, 3620 }; 3621 static struct kobj_type rdev_ktype = { 3622 .release = rdev_free, 3623 .sysfs_ops = &rdev_sysfs_ops, 3624 .default_attrs = rdev_default_attrs, 3625 }; 3626 3627 int md_rdev_init(struct md_rdev *rdev) 3628 { 3629 rdev->desc_nr = -1; 3630 rdev->saved_raid_disk = -1; 3631 rdev->raid_disk = -1; 3632 rdev->flags = 0; 3633 rdev->data_offset = 0; 3634 rdev->new_data_offset = 0; 3635 rdev->sb_events = 0; 3636 rdev->last_read_error = 0; 3637 rdev->sb_loaded = 0; 3638 rdev->bb_page = NULL; 3639 atomic_set(&rdev->nr_pending, 0); 3640 atomic_set(&rdev->read_errors, 0); 3641 atomic_set(&rdev->corrected_errors, 0); 3642 3643 INIT_LIST_HEAD(&rdev->same_set); 3644 init_waitqueue_head(&rdev->blocked_wait); 3645 3646 /* Add space to store bad block list. 3647 * This reserves the space even on arrays where it cannot 3648 * be used - I wonder if that matters 3649 */ 3650 return badblocks_init(&rdev->badblocks, 0); 3651 } 3652 EXPORT_SYMBOL_GPL(md_rdev_init); 3653 /* 3654 * Import a device. If 'super_format' >= 0, then sanity check the superblock 3655 * 3656 * mark the device faulty if: 3657 * 3658 * - the device is nonexistent (zero size) 3659 * - the device has no valid superblock 3660 * 3661 * a faulty rdev _never_ has rdev->sb set. 3662 */ 3663 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) 3664 { 3665 char b[BDEVNAME_SIZE]; 3666 int err; 3667 struct md_rdev *rdev; 3668 sector_t size; 3669 3670 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); 3671 if (!rdev) 3672 return ERR_PTR(-ENOMEM); 3673 3674 err = md_rdev_init(rdev); 3675 if (err) 3676 goto abort_free; 3677 err = alloc_disk_sb(rdev); 3678 if (err) 3679 goto abort_free; 3680 3681 err = lock_rdev(rdev, newdev, super_format == -2); 3682 if (err) 3683 goto abort_free; 3684 3685 kobject_init(&rdev->kobj, &rdev_ktype); 3686 3687 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; 3688 if (!size) { 3689 pr_warn("md: %s has zero or unknown size, marking faulty!\n", 3690 bdevname(rdev->bdev,b)); 3691 err = -EINVAL; 3692 goto abort_free; 3693 } 3694 3695 if (super_format >= 0) { 3696 err = super_types[super_format]. 3697 load_super(rdev, NULL, super_minor); 3698 if (err == -EINVAL) { 3699 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n", 3700 bdevname(rdev->bdev,b), 3701 super_format, super_minor); 3702 goto abort_free; 3703 } 3704 if (err < 0) { 3705 pr_warn("md: could not read %s's sb, not importing!\n", 3706 bdevname(rdev->bdev,b)); 3707 goto abort_free; 3708 } 3709 } 3710 3711 return rdev; 3712 3713 abort_free: 3714 if (rdev->bdev) 3715 unlock_rdev(rdev); 3716 md_rdev_clear(rdev); 3717 kfree(rdev); 3718 return ERR_PTR(err); 3719 } 3720 3721 /* 3722 * Check a full RAID array for plausibility 3723 */ 3724 3725 static int analyze_sbs(struct mddev *mddev) 3726 { 3727 int i; 3728 struct md_rdev *rdev, *freshest, *tmp; 3729 char b[BDEVNAME_SIZE]; 3730 3731 freshest = NULL; 3732 rdev_for_each_safe(rdev, tmp, mddev) 3733 switch (super_types[mddev->major_version]. 3734 load_super(rdev, freshest, mddev->minor_version)) { 3735 case 1: 3736 freshest = rdev; 3737 break; 3738 case 0: 3739 break; 3740 default: 3741 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n", 3742 bdevname(rdev->bdev,b)); 3743 md_kick_rdev_from_array(rdev); 3744 } 3745 3746 /* Cannot find a valid fresh disk */ 3747 if (!freshest) { 3748 pr_warn("md: cannot find a valid disk\n"); 3749 return -EINVAL; 3750 } 3751 3752 super_types[mddev->major_version]. 3753 validate_super(mddev, freshest); 3754 3755 i = 0; 3756 rdev_for_each_safe(rdev, tmp, mddev) { 3757 if (mddev->max_disks && 3758 (rdev->desc_nr >= mddev->max_disks || 3759 i > mddev->max_disks)) { 3760 pr_warn("md: %s: %s: only %d devices permitted\n", 3761 mdname(mddev), bdevname(rdev->bdev, b), 3762 mddev->max_disks); 3763 md_kick_rdev_from_array(rdev); 3764 continue; 3765 } 3766 if (rdev != freshest) { 3767 if (super_types[mddev->major_version]. 3768 validate_super(mddev, rdev)) { 3769 pr_warn("md: kicking non-fresh %s from array!\n", 3770 bdevname(rdev->bdev,b)); 3771 md_kick_rdev_from_array(rdev); 3772 continue; 3773 } 3774 } 3775 if (mddev->level == LEVEL_MULTIPATH) { 3776 rdev->desc_nr = i++; 3777 rdev->raid_disk = rdev->desc_nr; 3778 set_bit(In_sync, &rdev->flags); 3779 } else if (rdev->raid_disk >= 3780 (mddev->raid_disks - min(0, mddev->delta_disks)) && 3781 !test_bit(Journal, &rdev->flags)) { 3782 rdev->raid_disk = -1; 3783 clear_bit(In_sync, &rdev->flags); 3784 } 3785 } 3786 3787 return 0; 3788 } 3789 3790 /* Read a fixed-point number. 3791 * Numbers in sysfs attributes should be in "standard" units where 3792 * possible, so time should be in seconds. 3793 * However we internally use a a much smaller unit such as 3794 * milliseconds or jiffies. 3795 * This function takes a decimal number with a possible fractional 3796 * component, and produces an integer which is the result of 3797 * multiplying that number by 10^'scale'. 3798 * all without any floating-point arithmetic. 3799 */ 3800 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) 3801 { 3802 unsigned long result = 0; 3803 long decimals = -1; 3804 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { 3805 if (*cp == '.') 3806 decimals = 0; 3807 else if (decimals < scale) { 3808 unsigned int value; 3809 value = *cp - '0'; 3810 result = result * 10 + value; 3811 if (decimals >= 0) 3812 decimals++; 3813 } 3814 cp++; 3815 } 3816 if (*cp == '\n') 3817 cp++; 3818 if (*cp) 3819 return -EINVAL; 3820 if (decimals < 0) 3821 decimals = 0; 3822 *res = result * int_pow(10, scale - decimals); 3823 return 0; 3824 } 3825 3826 static ssize_t 3827 safe_delay_show(struct mddev *mddev, char *page) 3828 { 3829 int msec = (mddev->safemode_delay*1000)/HZ; 3830 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); 3831 } 3832 static ssize_t 3833 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) 3834 { 3835 unsigned long msec; 3836 3837 if (mddev_is_clustered(mddev)) { 3838 pr_warn("md: Safemode is disabled for clustered mode\n"); 3839 return -EINVAL; 3840 } 3841 3842 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) 3843 return -EINVAL; 3844 if (msec == 0) 3845 mddev->safemode_delay = 0; 3846 else { 3847 unsigned long old_delay = mddev->safemode_delay; 3848 unsigned long new_delay = (msec*HZ)/1000; 3849 3850 if (new_delay == 0) 3851 new_delay = 1; 3852 mddev->safemode_delay = new_delay; 3853 if (new_delay < old_delay || old_delay == 0) 3854 mod_timer(&mddev->safemode_timer, jiffies+1); 3855 } 3856 return len; 3857 } 3858 static struct md_sysfs_entry md_safe_delay = 3859 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); 3860 3861 static ssize_t 3862 level_show(struct mddev *mddev, char *page) 3863 { 3864 struct md_personality *p; 3865 int ret; 3866 spin_lock(&mddev->lock); 3867 p = mddev->pers; 3868 if (p) 3869 ret = sprintf(page, "%s\n", p->name); 3870 else if (mddev->clevel[0]) 3871 ret = sprintf(page, "%s\n", mddev->clevel); 3872 else if (mddev->level != LEVEL_NONE) 3873 ret = sprintf(page, "%d\n", mddev->level); 3874 else 3875 ret = 0; 3876 spin_unlock(&mddev->lock); 3877 return ret; 3878 } 3879 3880 static ssize_t 3881 level_store(struct mddev *mddev, const char *buf, size_t len) 3882 { 3883 char clevel[16]; 3884 ssize_t rv; 3885 size_t slen = len; 3886 struct md_personality *pers, *oldpers; 3887 long level; 3888 void *priv, *oldpriv; 3889 struct md_rdev *rdev; 3890 3891 if (slen == 0 || slen >= sizeof(clevel)) 3892 return -EINVAL; 3893 3894 rv = mddev_lock(mddev); 3895 if (rv) 3896 return rv; 3897 3898 if (mddev->pers == NULL) { 3899 strncpy(mddev->clevel, buf, slen); 3900 if (mddev->clevel[slen-1] == '\n') 3901 slen--; 3902 mddev->clevel[slen] = 0; 3903 mddev->level = LEVEL_NONE; 3904 rv = len; 3905 goto out_unlock; 3906 } 3907 rv = -EROFS; 3908 if (mddev->ro) 3909 goto out_unlock; 3910 3911 /* request to change the personality. Need to ensure: 3912 * - array is not engaged in resync/recovery/reshape 3913 * - old personality can be suspended 3914 * - new personality will access other array. 3915 */ 3916 3917 rv = -EBUSY; 3918 if (mddev->sync_thread || 3919 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 3920 mddev->reshape_position != MaxSector || 3921 mddev->sysfs_active) 3922 goto out_unlock; 3923 3924 rv = -EINVAL; 3925 if (!mddev->pers->quiesce) { 3926 pr_warn("md: %s: %s does not support online personality change\n", 3927 mdname(mddev), mddev->pers->name); 3928 goto out_unlock; 3929 } 3930 3931 /* Now find the new personality */ 3932 strncpy(clevel, buf, slen); 3933 if (clevel[slen-1] == '\n') 3934 slen--; 3935 clevel[slen] = 0; 3936 if (kstrtol(clevel, 10, &level)) 3937 level = LEVEL_NONE; 3938 3939 if (request_module("md-%s", clevel) != 0) 3940 request_module("md-level-%s", clevel); 3941 spin_lock(&pers_lock); 3942 pers = find_pers(level, clevel); 3943 if (!pers || !try_module_get(pers->owner)) { 3944 spin_unlock(&pers_lock); 3945 pr_warn("md: personality %s not loaded\n", clevel); 3946 rv = -EINVAL; 3947 goto out_unlock; 3948 } 3949 spin_unlock(&pers_lock); 3950 3951 if (pers == mddev->pers) { 3952 /* Nothing to do! */ 3953 module_put(pers->owner); 3954 rv = len; 3955 goto out_unlock; 3956 } 3957 if (!pers->takeover) { 3958 module_put(pers->owner); 3959 pr_warn("md: %s: %s does not support personality takeover\n", 3960 mdname(mddev), clevel); 3961 rv = -EINVAL; 3962 goto out_unlock; 3963 } 3964 3965 rdev_for_each(rdev, mddev) 3966 rdev->new_raid_disk = rdev->raid_disk; 3967 3968 /* ->takeover must set new_* and/or delta_disks 3969 * if it succeeds, and may set them when it fails. 3970 */ 3971 priv = pers->takeover(mddev); 3972 if (IS_ERR(priv)) { 3973 mddev->new_level = mddev->level; 3974 mddev->new_layout = mddev->layout; 3975 mddev->new_chunk_sectors = mddev->chunk_sectors; 3976 mddev->raid_disks -= mddev->delta_disks; 3977 mddev->delta_disks = 0; 3978 mddev->reshape_backwards = 0; 3979 module_put(pers->owner); 3980 pr_warn("md: %s: %s would not accept array\n", 3981 mdname(mddev), clevel); 3982 rv = PTR_ERR(priv); 3983 goto out_unlock; 3984 } 3985 3986 /* Looks like we have a winner */ 3987 mddev_suspend(mddev); 3988 mddev_detach(mddev); 3989 3990 spin_lock(&mddev->lock); 3991 oldpers = mddev->pers; 3992 oldpriv = mddev->private; 3993 mddev->pers = pers; 3994 mddev->private = priv; 3995 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 3996 mddev->level = mddev->new_level; 3997 mddev->layout = mddev->new_layout; 3998 mddev->chunk_sectors = mddev->new_chunk_sectors; 3999 mddev->delta_disks = 0; 4000 mddev->reshape_backwards = 0; 4001 mddev->degraded = 0; 4002 spin_unlock(&mddev->lock); 4003 4004 if (oldpers->sync_request == NULL && 4005 mddev->external) { 4006 /* We are converting from a no-redundancy array 4007 * to a redundancy array and metadata is managed 4008 * externally so we need to be sure that writes 4009 * won't block due to a need to transition 4010 * clean->dirty 4011 * until external management is started. 4012 */ 4013 mddev->in_sync = 0; 4014 mddev->safemode_delay = 0; 4015 mddev->safemode = 0; 4016 } 4017 4018 oldpers->free(mddev, oldpriv); 4019 4020 if (oldpers->sync_request == NULL && 4021 pers->sync_request != NULL) { 4022 /* need to add the md_redundancy_group */ 4023 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 4024 pr_warn("md: cannot register extra attributes for %s\n", 4025 mdname(mddev)); 4026 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); 4027 } 4028 if (oldpers->sync_request != NULL && 4029 pers->sync_request == NULL) { 4030 /* need to remove the md_redundancy_group */ 4031 if (mddev->to_remove == NULL) 4032 mddev->to_remove = &md_redundancy_group; 4033 } 4034 4035 module_put(oldpers->owner); 4036 4037 rdev_for_each(rdev, mddev) { 4038 if (rdev->raid_disk < 0) 4039 continue; 4040 if (rdev->new_raid_disk >= mddev->raid_disks) 4041 rdev->new_raid_disk = -1; 4042 if (rdev->new_raid_disk == rdev->raid_disk) 4043 continue; 4044 sysfs_unlink_rdev(mddev, rdev); 4045 } 4046 rdev_for_each(rdev, mddev) { 4047 if (rdev->raid_disk < 0) 4048 continue; 4049 if (rdev->new_raid_disk == rdev->raid_disk) 4050 continue; 4051 rdev->raid_disk = rdev->new_raid_disk; 4052 if (rdev->raid_disk < 0) 4053 clear_bit(In_sync, &rdev->flags); 4054 else { 4055 if (sysfs_link_rdev(mddev, rdev)) 4056 pr_warn("md: cannot register rd%d for %s after level change\n", 4057 rdev->raid_disk, mdname(mddev)); 4058 } 4059 } 4060 4061 if (pers->sync_request == NULL) { 4062 /* this is now an array without redundancy, so 4063 * it must always be in_sync 4064 */ 4065 mddev->in_sync = 1; 4066 del_timer_sync(&mddev->safemode_timer); 4067 } 4068 blk_set_stacking_limits(&mddev->queue->limits); 4069 pers->run(mddev); 4070 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 4071 mddev_resume(mddev); 4072 if (!mddev->thread) 4073 md_update_sb(mddev, 1); 4074 sysfs_notify(&mddev->kobj, NULL, "level"); 4075 md_new_event(mddev); 4076 rv = len; 4077 out_unlock: 4078 mddev_unlock(mddev); 4079 return rv; 4080 } 4081 4082 static struct md_sysfs_entry md_level = 4083 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); 4084 4085 static ssize_t 4086 layout_show(struct mddev *mddev, char *page) 4087 { 4088 /* just a number, not meaningful for all levels */ 4089 if (mddev->reshape_position != MaxSector && 4090 mddev->layout != mddev->new_layout) 4091 return sprintf(page, "%d (%d)\n", 4092 mddev->new_layout, mddev->layout); 4093 return sprintf(page, "%d\n", mddev->layout); 4094 } 4095 4096 static ssize_t 4097 layout_store(struct mddev *mddev, const char *buf, size_t len) 4098 { 4099 unsigned int n; 4100 int err; 4101 4102 err = kstrtouint(buf, 10, &n); 4103 if (err < 0) 4104 return err; 4105 err = mddev_lock(mddev); 4106 if (err) 4107 return err; 4108 4109 if (mddev->pers) { 4110 if (mddev->pers->check_reshape == NULL) 4111 err = -EBUSY; 4112 else if (mddev->ro) 4113 err = -EROFS; 4114 else { 4115 mddev->new_layout = n; 4116 err = mddev->pers->check_reshape(mddev); 4117 if (err) 4118 mddev->new_layout = mddev->layout; 4119 } 4120 } else { 4121 mddev->new_layout = n; 4122 if (mddev->reshape_position == MaxSector) 4123 mddev->layout = n; 4124 } 4125 mddev_unlock(mddev); 4126 return err ?: len; 4127 } 4128 static struct md_sysfs_entry md_layout = 4129 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); 4130 4131 static ssize_t 4132 raid_disks_show(struct mddev *mddev, char *page) 4133 { 4134 if (mddev->raid_disks == 0) 4135 return 0; 4136 if (mddev->reshape_position != MaxSector && 4137 mddev->delta_disks != 0) 4138 return sprintf(page, "%d (%d)\n", mddev->raid_disks, 4139 mddev->raid_disks - mddev->delta_disks); 4140 return sprintf(page, "%d\n", mddev->raid_disks); 4141 } 4142 4143 static int update_raid_disks(struct mddev *mddev, int raid_disks); 4144 4145 static ssize_t 4146 raid_disks_store(struct mddev *mddev, const char *buf, size_t len) 4147 { 4148 unsigned int n; 4149 int err; 4150 4151 err = kstrtouint(buf, 10, &n); 4152 if (err < 0) 4153 return err; 4154 4155 err = mddev_lock(mddev); 4156 if (err) 4157 return err; 4158 if (mddev->pers) 4159 err = update_raid_disks(mddev, n); 4160 else if (mddev->reshape_position != MaxSector) { 4161 struct md_rdev *rdev; 4162 int olddisks = mddev->raid_disks - mddev->delta_disks; 4163 4164 err = -EINVAL; 4165 rdev_for_each(rdev, mddev) { 4166 if (olddisks < n && 4167 rdev->data_offset < rdev->new_data_offset) 4168 goto out_unlock; 4169 if (olddisks > n && 4170 rdev->data_offset > rdev->new_data_offset) 4171 goto out_unlock; 4172 } 4173 err = 0; 4174 mddev->delta_disks = n - olddisks; 4175 mddev->raid_disks = n; 4176 mddev->reshape_backwards = (mddev->delta_disks < 0); 4177 } else 4178 mddev->raid_disks = n; 4179 out_unlock: 4180 mddev_unlock(mddev); 4181 return err ? err : len; 4182 } 4183 static struct md_sysfs_entry md_raid_disks = 4184 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); 4185 4186 static ssize_t 4187 chunk_size_show(struct mddev *mddev, char *page) 4188 { 4189 if (mddev->reshape_position != MaxSector && 4190 mddev->chunk_sectors != mddev->new_chunk_sectors) 4191 return sprintf(page, "%d (%d)\n", 4192 mddev->new_chunk_sectors << 9, 4193 mddev->chunk_sectors << 9); 4194 return sprintf(page, "%d\n", mddev->chunk_sectors << 9); 4195 } 4196 4197 static ssize_t 4198 chunk_size_store(struct mddev *mddev, const char *buf, size_t len) 4199 { 4200 unsigned long n; 4201 int err; 4202 4203 err = kstrtoul(buf, 10, &n); 4204 if (err < 0) 4205 return err; 4206 4207 err = mddev_lock(mddev); 4208 if (err) 4209 return err; 4210 if (mddev->pers) { 4211 if (mddev->pers->check_reshape == NULL) 4212 err = -EBUSY; 4213 else if (mddev->ro) 4214 err = -EROFS; 4215 else { 4216 mddev->new_chunk_sectors = n >> 9; 4217 err = mddev->pers->check_reshape(mddev); 4218 if (err) 4219 mddev->new_chunk_sectors = mddev->chunk_sectors; 4220 } 4221 } else { 4222 mddev->new_chunk_sectors = n >> 9; 4223 if (mddev->reshape_position == MaxSector) 4224 mddev->chunk_sectors = n >> 9; 4225 } 4226 mddev_unlock(mddev); 4227 return err ?: len; 4228 } 4229 static struct md_sysfs_entry md_chunk_size = 4230 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); 4231 4232 static ssize_t 4233 resync_start_show(struct mddev *mddev, char *page) 4234 { 4235 if (mddev->recovery_cp == MaxSector) 4236 return sprintf(page, "none\n"); 4237 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); 4238 } 4239 4240 static ssize_t 4241 resync_start_store(struct mddev *mddev, const char *buf, size_t len) 4242 { 4243 unsigned long long n; 4244 int err; 4245 4246 if (cmd_match(buf, "none")) 4247 n = MaxSector; 4248 else { 4249 err = kstrtoull(buf, 10, &n); 4250 if (err < 0) 4251 return err; 4252 if (n != (sector_t)n) 4253 return -EINVAL; 4254 } 4255 4256 err = mddev_lock(mddev); 4257 if (err) 4258 return err; 4259 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 4260 err = -EBUSY; 4261 4262 if (!err) { 4263 mddev->recovery_cp = n; 4264 if (mddev->pers) 4265 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 4266 } 4267 mddev_unlock(mddev); 4268 return err ?: len; 4269 } 4270 static struct md_sysfs_entry md_resync_start = 4271 __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, 4272 resync_start_show, resync_start_store); 4273 4274 /* 4275 * The array state can be: 4276 * 4277 * clear 4278 * No devices, no size, no level 4279 * Equivalent to STOP_ARRAY ioctl 4280 * inactive 4281 * May have some settings, but array is not active 4282 * all IO results in error 4283 * When written, doesn't tear down array, but just stops it 4284 * suspended (not supported yet) 4285 * All IO requests will block. The array can be reconfigured. 4286 * Writing this, if accepted, will block until array is quiescent 4287 * readonly 4288 * no resync can happen. no superblocks get written. 4289 * write requests fail 4290 * read-auto 4291 * like readonly, but behaves like 'clean' on a write request. 4292 * 4293 * clean - no pending writes, but otherwise active. 4294 * When written to inactive array, starts without resync 4295 * If a write request arrives then 4296 * if metadata is known, mark 'dirty' and switch to 'active'. 4297 * if not known, block and switch to write-pending 4298 * If written to an active array that has pending writes, then fails. 4299 * active 4300 * fully active: IO and resync can be happening. 4301 * When written to inactive array, starts with resync 4302 * 4303 * write-pending 4304 * clean, but writes are blocked waiting for 'active' to be written. 4305 * 4306 * active-idle 4307 * like active, but no writes have been seen for a while (100msec). 4308 * 4309 * broken 4310 * RAID0/LINEAR-only: same as clean, but array is missing a member. 4311 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped 4312 * when a member is gone, so this state will at least alert the 4313 * user that something is wrong. 4314 */ 4315 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, 4316 write_pending, active_idle, broken, bad_word}; 4317 static char *array_states[] = { 4318 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", 4319 "write-pending", "active-idle", "broken", NULL }; 4320 4321 static int match_word(const char *word, char **list) 4322 { 4323 int n; 4324 for (n=0; list[n]; n++) 4325 if (cmd_match(word, list[n])) 4326 break; 4327 return n; 4328 } 4329 4330 static ssize_t 4331 array_state_show(struct mddev *mddev, char *page) 4332 { 4333 enum array_state st = inactive; 4334 4335 if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) { 4336 switch(mddev->ro) { 4337 case 1: 4338 st = readonly; 4339 break; 4340 case 2: 4341 st = read_auto; 4342 break; 4343 case 0: 4344 spin_lock(&mddev->lock); 4345 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 4346 st = write_pending; 4347 else if (mddev->in_sync) 4348 st = clean; 4349 else if (mddev->safemode) 4350 st = active_idle; 4351 else 4352 st = active; 4353 spin_unlock(&mddev->lock); 4354 } 4355 4356 if (test_bit(MD_BROKEN, &mddev->flags) && st == clean) 4357 st = broken; 4358 } else { 4359 if (list_empty(&mddev->disks) && 4360 mddev->raid_disks == 0 && 4361 mddev->dev_sectors == 0) 4362 st = clear; 4363 else 4364 st = inactive; 4365 } 4366 return sprintf(page, "%s\n", array_states[st]); 4367 } 4368 4369 static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); 4370 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); 4371 static int do_md_run(struct mddev *mddev); 4372 static int restart_array(struct mddev *mddev); 4373 4374 static ssize_t 4375 array_state_store(struct mddev *mddev, const char *buf, size_t len) 4376 { 4377 int err = 0; 4378 enum array_state st = match_word(buf, array_states); 4379 4380 if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { 4381 /* don't take reconfig_mutex when toggling between 4382 * clean and active 4383 */ 4384 spin_lock(&mddev->lock); 4385 if (st == active) { 4386 restart_array(mddev); 4387 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 4388 md_wakeup_thread(mddev->thread); 4389 wake_up(&mddev->sb_wait); 4390 } else /* st == clean */ { 4391 restart_array(mddev); 4392 if (!set_in_sync(mddev)) 4393 err = -EBUSY; 4394 } 4395 if (!err) 4396 sysfs_notify_dirent_safe(mddev->sysfs_state); 4397 spin_unlock(&mddev->lock); 4398 return err ?: len; 4399 } 4400 err = mddev_lock(mddev); 4401 if (err) 4402 return err; 4403 err = -EINVAL; 4404 switch(st) { 4405 case bad_word: 4406 break; 4407 case clear: 4408 /* stopping an active array */ 4409 err = do_md_stop(mddev, 0, NULL); 4410 break; 4411 case inactive: 4412 /* stopping an active array */ 4413 if (mddev->pers) 4414 err = do_md_stop(mddev, 2, NULL); 4415 else 4416 err = 0; /* already inactive */ 4417 break; 4418 case suspended: 4419 break; /* not supported yet */ 4420 case readonly: 4421 if (mddev->pers) 4422 err = md_set_readonly(mddev, NULL); 4423 else { 4424 mddev->ro = 1; 4425 set_disk_ro(mddev->gendisk, 1); 4426 err = do_md_run(mddev); 4427 } 4428 break; 4429 case read_auto: 4430 if (mddev->pers) { 4431 if (mddev->ro == 0) 4432 err = md_set_readonly(mddev, NULL); 4433 else if (mddev->ro == 1) 4434 err = restart_array(mddev); 4435 if (err == 0) { 4436 mddev->ro = 2; 4437 set_disk_ro(mddev->gendisk, 0); 4438 } 4439 } else { 4440 mddev->ro = 2; 4441 err = do_md_run(mddev); 4442 } 4443 break; 4444 case clean: 4445 if (mddev->pers) { 4446 err = restart_array(mddev); 4447 if (err) 4448 break; 4449 spin_lock(&mddev->lock); 4450 if (!set_in_sync(mddev)) 4451 err = -EBUSY; 4452 spin_unlock(&mddev->lock); 4453 } else 4454 err = -EINVAL; 4455 break; 4456 case active: 4457 if (mddev->pers) { 4458 err = restart_array(mddev); 4459 if (err) 4460 break; 4461 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 4462 wake_up(&mddev->sb_wait); 4463 err = 0; 4464 } else { 4465 mddev->ro = 0; 4466 set_disk_ro(mddev->gendisk, 0); 4467 err = do_md_run(mddev); 4468 } 4469 break; 4470 case write_pending: 4471 case active_idle: 4472 case broken: 4473 /* these cannot be set */ 4474 break; 4475 } 4476 4477 if (!err) { 4478 if (mddev->hold_active == UNTIL_IOCTL) 4479 mddev->hold_active = 0; 4480 sysfs_notify_dirent_safe(mddev->sysfs_state); 4481 } 4482 mddev_unlock(mddev); 4483 return err ?: len; 4484 } 4485 static struct md_sysfs_entry md_array_state = 4486 __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); 4487 4488 static ssize_t 4489 max_corrected_read_errors_show(struct mddev *mddev, char *page) { 4490 return sprintf(page, "%d\n", 4491 atomic_read(&mddev->max_corr_read_errors)); 4492 } 4493 4494 static ssize_t 4495 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) 4496 { 4497 unsigned int n; 4498 int rv; 4499 4500 rv = kstrtouint(buf, 10, &n); 4501 if (rv < 0) 4502 return rv; 4503 atomic_set(&mddev->max_corr_read_errors, n); 4504 return len; 4505 } 4506 4507 static struct md_sysfs_entry max_corr_read_errors = 4508 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, 4509 max_corrected_read_errors_store); 4510 4511 static ssize_t 4512 null_show(struct mddev *mddev, char *page) 4513 { 4514 return -EINVAL; 4515 } 4516 4517 static ssize_t 4518 new_dev_store(struct mddev *mddev, const char *buf, size_t len) 4519 { 4520 /* buf must be %d:%d\n? giving major and minor numbers */ 4521 /* The new device is added to the array. 4522 * If the array has a persistent superblock, we read the 4523 * superblock to initialise info and check validity. 4524 * Otherwise, only checking done is that in bind_rdev_to_array, 4525 * which mainly checks size. 4526 */ 4527 char *e; 4528 int major = simple_strtoul(buf, &e, 10); 4529 int minor; 4530 dev_t dev; 4531 struct md_rdev *rdev; 4532 int err; 4533 4534 if (!*buf || *e != ':' || !e[1] || e[1] == '\n') 4535 return -EINVAL; 4536 minor = simple_strtoul(e+1, &e, 10); 4537 if (*e && *e != '\n') 4538 return -EINVAL; 4539 dev = MKDEV(major, minor); 4540 if (major != MAJOR(dev) || 4541 minor != MINOR(dev)) 4542 return -EOVERFLOW; 4543 4544 flush_workqueue(md_misc_wq); 4545 4546 err = mddev_lock(mddev); 4547 if (err) 4548 return err; 4549 if (mddev->persistent) { 4550 rdev = md_import_device(dev, mddev->major_version, 4551 mddev->minor_version); 4552 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { 4553 struct md_rdev *rdev0 4554 = list_entry(mddev->disks.next, 4555 struct md_rdev, same_set); 4556 err = super_types[mddev->major_version] 4557 .load_super(rdev, rdev0, mddev->minor_version); 4558 if (err < 0) 4559 goto out; 4560 } 4561 } else if (mddev->external) 4562 rdev = md_import_device(dev, -2, -1); 4563 else 4564 rdev = md_import_device(dev, -1, -1); 4565 4566 if (IS_ERR(rdev)) { 4567 mddev_unlock(mddev); 4568 return PTR_ERR(rdev); 4569 } 4570 err = bind_rdev_to_array(rdev, mddev); 4571 out: 4572 if (err) 4573 export_rdev(rdev); 4574 mddev_unlock(mddev); 4575 if (!err) 4576 md_new_event(mddev); 4577 return err ? err : len; 4578 } 4579 4580 static struct md_sysfs_entry md_new_device = 4581 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); 4582 4583 static ssize_t 4584 bitmap_store(struct mddev *mddev, const char *buf, size_t len) 4585 { 4586 char *end; 4587 unsigned long chunk, end_chunk; 4588 int err; 4589 4590 err = mddev_lock(mddev); 4591 if (err) 4592 return err; 4593 if (!mddev->bitmap) 4594 goto out; 4595 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ 4596 while (*buf) { 4597 chunk = end_chunk = simple_strtoul(buf, &end, 0); 4598 if (buf == end) break; 4599 if (*end == '-') { /* range */ 4600 buf = end + 1; 4601 end_chunk = simple_strtoul(buf, &end, 0); 4602 if (buf == end) break; 4603 } 4604 if (*end && !isspace(*end)) break; 4605 md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); 4606 buf = skip_spaces(end); 4607 } 4608 md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ 4609 out: 4610 mddev_unlock(mddev); 4611 return len; 4612 } 4613 4614 static struct md_sysfs_entry md_bitmap = 4615 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); 4616 4617 static ssize_t 4618 size_show(struct mddev *mddev, char *page) 4619 { 4620 return sprintf(page, "%llu\n", 4621 (unsigned long long)mddev->dev_sectors / 2); 4622 } 4623 4624 static int update_size(struct mddev *mddev, sector_t num_sectors); 4625 4626 static ssize_t 4627 size_store(struct mddev *mddev, const char *buf, size_t len) 4628 { 4629 /* If array is inactive, we can reduce the component size, but 4630 * not increase it (except from 0). 4631 * If array is active, we can try an on-line resize 4632 */ 4633 sector_t sectors; 4634 int err = strict_blocks_to_sectors(buf, §ors); 4635 4636 if (err < 0) 4637 return err; 4638 err = mddev_lock(mddev); 4639 if (err) 4640 return err; 4641 if (mddev->pers) { 4642 err = update_size(mddev, sectors); 4643 if (err == 0) 4644 md_update_sb(mddev, 1); 4645 } else { 4646 if (mddev->dev_sectors == 0 || 4647 mddev->dev_sectors > sectors) 4648 mddev->dev_sectors = sectors; 4649 else 4650 err = -ENOSPC; 4651 } 4652 mddev_unlock(mddev); 4653 return err ? err : len; 4654 } 4655 4656 static struct md_sysfs_entry md_size = 4657 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); 4658 4659 /* Metadata version. 4660 * This is one of 4661 * 'none' for arrays with no metadata (good luck...) 4662 * 'external' for arrays with externally managed metadata, 4663 * or N.M for internally known formats 4664 */ 4665 static ssize_t 4666 metadata_show(struct mddev *mddev, char *page) 4667 { 4668 if (mddev->persistent) 4669 return sprintf(page, "%d.%d\n", 4670 mddev->major_version, mddev->minor_version); 4671 else if (mddev->external) 4672 return sprintf(page, "external:%s\n", mddev->metadata_type); 4673 else 4674 return sprintf(page, "none\n"); 4675 } 4676 4677 static ssize_t 4678 metadata_store(struct mddev *mddev, const char *buf, size_t len) 4679 { 4680 int major, minor; 4681 char *e; 4682 int err; 4683 /* Changing the details of 'external' metadata is 4684 * always permitted. Otherwise there must be 4685 * no devices attached to the array. 4686 */ 4687 4688 err = mddev_lock(mddev); 4689 if (err) 4690 return err; 4691 err = -EBUSY; 4692 if (mddev->external && strncmp(buf, "external:", 9) == 0) 4693 ; 4694 else if (!list_empty(&mddev->disks)) 4695 goto out_unlock; 4696 4697 err = 0; 4698 if (cmd_match(buf, "none")) { 4699 mddev->persistent = 0; 4700 mddev->external = 0; 4701 mddev->major_version = 0; 4702 mddev->minor_version = 90; 4703 goto out_unlock; 4704 } 4705 if (strncmp(buf, "external:", 9) == 0) { 4706 size_t namelen = len-9; 4707 if (namelen >= sizeof(mddev->metadata_type)) 4708 namelen = sizeof(mddev->metadata_type)-1; 4709 strncpy(mddev->metadata_type, buf+9, namelen); 4710 mddev->metadata_type[namelen] = 0; 4711 if (namelen && mddev->metadata_type[namelen-1] == '\n') 4712 mddev->metadata_type[--namelen] = 0; 4713 mddev->persistent = 0; 4714 mddev->external = 1; 4715 mddev->major_version = 0; 4716 mddev->minor_version = 90; 4717 goto out_unlock; 4718 } 4719 major = simple_strtoul(buf, &e, 10); 4720 err = -EINVAL; 4721 if (e==buf || *e != '.') 4722 goto out_unlock; 4723 buf = e+1; 4724 minor = simple_strtoul(buf, &e, 10); 4725 if (e==buf || (*e && *e != '\n') ) 4726 goto out_unlock; 4727 err = -ENOENT; 4728 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) 4729 goto out_unlock; 4730 mddev->major_version = major; 4731 mddev->minor_version = minor; 4732 mddev->persistent = 1; 4733 mddev->external = 0; 4734 err = 0; 4735 out_unlock: 4736 mddev_unlock(mddev); 4737 return err ?: len; 4738 } 4739 4740 static struct md_sysfs_entry md_metadata = 4741 __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); 4742 4743 static ssize_t 4744 action_show(struct mddev *mddev, char *page) 4745 { 4746 char *type = "idle"; 4747 unsigned long recovery = mddev->recovery; 4748 if (test_bit(MD_RECOVERY_FROZEN, &recovery)) 4749 type = "frozen"; 4750 else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || 4751 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { 4752 if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) 4753 type = "reshape"; 4754 else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { 4755 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) 4756 type = "resync"; 4757 else if (test_bit(MD_RECOVERY_CHECK, &recovery)) 4758 type = "check"; 4759 else 4760 type = "repair"; 4761 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) 4762 type = "recover"; 4763 else if (mddev->reshape_position != MaxSector) 4764 type = "reshape"; 4765 } 4766 return sprintf(page, "%s\n", type); 4767 } 4768 4769 static ssize_t 4770 action_store(struct mddev *mddev, const char *page, size_t len) 4771 { 4772 if (!mddev->pers || !mddev->pers->sync_request) 4773 return -EINVAL; 4774 4775 4776 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { 4777 if (cmd_match(page, "frozen")) 4778 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4779 else 4780 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4781 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 4782 mddev_lock(mddev) == 0) { 4783 flush_workqueue(md_misc_wq); 4784 if (mddev->sync_thread) { 4785 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4786 md_reap_sync_thread(mddev); 4787 } 4788 mddev_unlock(mddev); 4789 } 4790 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4791 return -EBUSY; 4792 else if (cmd_match(page, "resync")) 4793 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4794 else if (cmd_match(page, "recover")) { 4795 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4796 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 4797 } else if (cmd_match(page, "reshape")) { 4798 int err; 4799 if (mddev->pers->start_reshape == NULL) 4800 return -EINVAL; 4801 err = mddev_lock(mddev); 4802 if (!err) { 4803 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4804 err = -EBUSY; 4805 else { 4806 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4807 err = mddev->pers->start_reshape(mddev); 4808 } 4809 mddev_unlock(mddev); 4810 } 4811 if (err) 4812 return err; 4813 sysfs_notify(&mddev->kobj, NULL, "degraded"); 4814 } else { 4815 if (cmd_match(page, "check")) 4816 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4817 else if (!cmd_match(page, "repair")) 4818 return -EINVAL; 4819 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4820 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 4821 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4822 } 4823 if (mddev->ro == 2) { 4824 /* A write to sync_action is enough to justify 4825 * canceling read-auto mode 4826 */ 4827 mddev->ro = 0; 4828 md_wakeup_thread(mddev->sync_thread); 4829 } 4830 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4831 md_wakeup_thread(mddev->thread); 4832 sysfs_notify_dirent_safe(mddev->sysfs_action); 4833 return len; 4834 } 4835 4836 static struct md_sysfs_entry md_scan_mode = 4837 __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 4838 4839 static ssize_t 4840 last_sync_action_show(struct mddev *mddev, char *page) 4841 { 4842 return sprintf(page, "%s\n", mddev->last_sync_action); 4843 } 4844 4845 static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); 4846 4847 static ssize_t 4848 mismatch_cnt_show(struct mddev *mddev, char *page) 4849 { 4850 return sprintf(page, "%llu\n", 4851 (unsigned long long) 4852 atomic64_read(&mddev->resync_mismatches)); 4853 } 4854 4855 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); 4856 4857 static ssize_t 4858 sync_min_show(struct mddev *mddev, char *page) 4859 { 4860 return sprintf(page, "%d (%s)\n", speed_min(mddev), 4861 mddev->sync_speed_min ? "local": "system"); 4862 } 4863 4864 static ssize_t 4865 sync_min_store(struct mddev *mddev, const char *buf, size_t len) 4866 { 4867 unsigned int min; 4868 int rv; 4869 4870 if (strncmp(buf, "system", 6)==0) { 4871 min = 0; 4872 } else { 4873 rv = kstrtouint(buf, 10, &min); 4874 if (rv < 0) 4875 return rv; 4876 if (min == 0) 4877 return -EINVAL; 4878 } 4879 mddev->sync_speed_min = min; 4880 return len; 4881 } 4882 4883 static struct md_sysfs_entry md_sync_min = 4884 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); 4885 4886 static ssize_t 4887 sync_max_show(struct mddev *mddev, char *page) 4888 { 4889 return sprintf(page, "%d (%s)\n", speed_max(mddev), 4890 mddev->sync_speed_max ? "local": "system"); 4891 } 4892 4893 static ssize_t 4894 sync_max_store(struct mddev *mddev, const char *buf, size_t len) 4895 { 4896 unsigned int max; 4897 int rv; 4898 4899 if (strncmp(buf, "system", 6)==0) { 4900 max = 0; 4901 } else { 4902 rv = kstrtouint(buf, 10, &max); 4903 if (rv < 0) 4904 return rv; 4905 if (max == 0) 4906 return -EINVAL; 4907 } 4908 mddev->sync_speed_max = max; 4909 return len; 4910 } 4911 4912 static struct md_sysfs_entry md_sync_max = 4913 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); 4914 4915 static ssize_t 4916 degraded_show(struct mddev *mddev, char *page) 4917 { 4918 return sprintf(page, "%d\n", mddev->degraded); 4919 } 4920 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); 4921 4922 static ssize_t 4923 sync_force_parallel_show(struct mddev *mddev, char *page) 4924 { 4925 return sprintf(page, "%d\n", mddev->parallel_resync); 4926 } 4927 4928 static ssize_t 4929 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) 4930 { 4931 long n; 4932 4933 if (kstrtol(buf, 10, &n)) 4934 return -EINVAL; 4935 4936 if (n != 0 && n != 1) 4937 return -EINVAL; 4938 4939 mddev->parallel_resync = n; 4940 4941 if (mddev->sync_thread) 4942 wake_up(&resync_wait); 4943 4944 return len; 4945 } 4946 4947 /* force parallel resync, even with shared block devices */ 4948 static struct md_sysfs_entry md_sync_force_parallel = 4949 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, 4950 sync_force_parallel_show, sync_force_parallel_store); 4951 4952 static ssize_t 4953 sync_speed_show(struct mddev *mddev, char *page) 4954 { 4955 unsigned long resync, dt, db; 4956 if (mddev->curr_resync == 0) 4957 return sprintf(page, "none\n"); 4958 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); 4959 dt = (jiffies - mddev->resync_mark) / HZ; 4960 if (!dt) dt++; 4961 db = resync - mddev->resync_mark_cnt; 4962 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ 4963 } 4964 4965 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); 4966 4967 static ssize_t 4968 sync_completed_show(struct mddev *mddev, char *page) 4969 { 4970 unsigned long long max_sectors, resync; 4971 4972 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4973 return sprintf(page, "none\n"); 4974 4975 if (mddev->curr_resync == 1 || 4976 mddev->curr_resync == 2) 4977 return sprintf(page, "delayed\n"); 4978 4979 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 4980 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 4981 max_sectors = mddev->resync_max_sectors; 4982 else 4983 max_sectors = mddev->dev_sectors; 4984 4985 resync = mddev->curr_resync_completed; 4986 return sprintf(page, "%llu / %llu\n", resync, max_sectors); 4987 } 4988 4989 static struct md_sysfs_entry md_sync_completed = 4990 __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); 4991 4992 static ssize_t 4993 min_sync_show(struct mddev *mddev, char *page) 4994 { 4995 return sprintf(page, "%llu\n", 4996 (unsigned long long)mddev->resync_min); 4997 } 4998 static ssize_t 4999 min_sync_store(struct mddev *mddev, const char *buf, size_t len) 5000 { 5001 unsigned long long min; 5002 int err; 5003 5004 if (kstrtoull(buf, 10, &min)) 5005 return -EINVAL; 5006 5007 spin_lock(&mddev->lock); 5008 err = -EINVAL; 5009 if (min > mddev->resync_max) 5010 goto out_unlock; 5011 5012 err = -EBUSY; 5013 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 5014 goto out_unlock; 5015 5016 /* Round down to multiple of 4K for safety */ 5017 mddev->resync_min = round_down(min, 8); 5018 err = 0; 5019 5020 out_unlock: 5021 spin_unlock(&mddev->lock); 5022 return err ?: len; 5023 } 5024 5025 static struct md_sysfs_entry md_min_sync = 5026 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); 5027 5028 static ssize_t 5029 max_sync_show(struct mddev *mddev, char *page) 5030 { 5031 if (mddev->resync_max == MaxSector) 5032 return sprintf(page, "max\n"); 5033 else 5034 return sprintf(page, "%llu\n", 5035 (unsigned long long)mddev->resync_max); 5036 } 5037 static ssize_t 5038 max_sync_store(struct mddev *mddev, const char *buf, size_t len) 5039 { 5040 int err; 5041 spin_lock(&mddev->lock); 5042 if (strncmp(buf, "max", 3) == 0) 5043 mddev->resync_max = MaxSector; 5044 else { 5045 unsigned long long max; 5046 int chunk; 5047 5048 err = -EINVAL; 5049 if (kstrtoull(buf, 10, &max)) 5050 goto out_unlock; 5051 if (max < mddev->resync_min) 5052 goto out_unlock; 5053 5054 err = -EBUSY; 5055 if (max < mddev->resync_max && 5056 mddev->ro == 0 && 5057 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 5058 goto out_unlock; 5059 5060 /* Must be a multiple of chunk_size */ 5061 chunk = mddev->chunk_sectors; 5062 if (chunk) { 5063 sector_t temp = max; 5064 5065 err = -EINVAL; 5066 if (sector_div(temp, chunk)) 5067 goto out_unlock; 5068 } 5069 mddev->resync_max = max; 5070 } 5071 wake_up(&mddev->recovery_wait); 5072 err = 0; 5073 out_unlock: 5074 spin_unlock(&mddev->lock); 5075 return err ?: len; 5076 } 5077 5078 static struct md_sysfs_entry md_max_sync = 5079 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); 5080 5081 static ssize_t 5082 suspend_lo_show(struct mddev *mddev, char *page) 5083 { 5084 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); 5085 } 5086 5087 static ssize_t 5088 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) 5089 { 5090 unsigned long long new; 5091 int err; 5092 5093 err = kstrtoull(buf, 10, &new); 5094 if (err < 0) 5095 return err; 5096 if (new != (sector_t)new) 5097 return -EINVAL; 5098 5099 err = mddev_lock(mddev); 5100 if (err) 5101 return err; 5102 err = -EINVAL; 5103 if (mddev->pers == NULL || 5104 mddev->pers->quiesce == NULL) 5105 goto unlock; 5106 mddev_suspend(mddev); 5107 mddev->suspend_lo = new; 5108 mddev_resume(mddev); 5109 5110 err = 0; 5111 unlock: 5112 mddev_unlock(mddev); 5113 return err ?: len; 5114 } 5115 static struct md_sysfs_entry md_suspend_lo = 5116 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); 5117 5118 static ssize_t 5119 suspend_hi_show(struct mddev *mddev, char *page) 5120 { 5121 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); 5122 } 5123 5124 static ssize_t 5125 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) 5126 { 5127 unsigned long long new; 5128 int err; 5129 5130 err = kstrtoull(buf, 10, &new); 5131 if (err < 0) 5132 return err; 5133 if (new != (sector_t)new) 5134 return -EINVAL; 5135 5136 err = mddev_lock(mddev); 5137 if (err) 5138 return err; 5139 err = -EINVAL; 5140 if (mddev->pers == NULL) 5141 goto unlock; 5142 5143 mddev_suspend(mddev); 5144 mddev->suspend_hi = new; 5145 mddev_resume(mddev); 5146 5147 err = 0; 5148 unlock: 5149 mddev_unlock(mddev); 5150 return err ?: len; 5151 } 5152 static struct md_sysfs_entry md_suspend_hi = 5153 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); 5154 5155 static ssize_t 5156 reshape_position_show(struct mddev *mddev, char *page) 5157 { 5158 if (mddev->reshape_position != MaxSector) 5159 return sprintf(page, "%llu\n", 5160 (unsigned long long)mddev->reshape_position); 5161 strcpy(page, "none\n"); 5162 return 5; 5163 } 5164 5165 static ssize_t 5166 reshape_position_store(struct mddev *mddev, const char *buf, size_t len) 5167 { 5168 struct md_rdev *rdev; 5169 unsigned long long new; 5170 int err; 5171 5172 err = kstrtoull(buf, 10, &new); 5173 if (err < 0) 5174 return err; 5175 if (new != (sector_t)new) 5176 return -EINVAL; 5177 err = mddev_lock(mddev); 5178 if (err) 5179 return err; 5180 err = -EBUSY; 5181 if (mddev->pers) 5182 goto unlock; 5183 mddev->reshape_position = new; 5184 mddev->delta_disks = 0; 5185 mddev->reshape_backwards = 0; 5186 mddev->new_level = mddev->level; 5187 mddev->new_layout = mddev->layout; 5188 mddev->new_chunk_sectors = mddev->chunk_sectors; 5189 rdev_for_each(rdev, mddev) 5190 rdev->new_data_offset = rdev->data_offset; 5191 err = 0; 5192 unlock: 5193 mddev_unlock(mddev); 5194 return err ?: len; 5195 } 5196 5197 static struct md_sysfs_entry md_reshape_position = 5198 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, 5199 reshape_position_store); 5200 5201 static ssize_t 5202 reshape_direction_show(struct mddev *mddev, char *page) 5203 { 5204 return sprintf(page, "%s\n", 5205 mddev->reshape_backwards ? "backwards" : "forwards"); 5206 } 5207 5208 static ssize_t 5209 reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) 5210 { 5211 int backwards = 0; 5212 int err; 5213 5214 if (cmd_match(buf, "forwards")) 5215 backwards = 0; 5216 else if (cmd_match(buf, "backwards")) 5217 backwards = 1; 5218 else 5219 return -EINVAL; 5220 if (mddev->reshape_backwards == backwards) 5221 return len; 5222 5223 err = mddev_lock(mddev); 5224 if (err) 5225 return err; 5226 /* check if we are allowed to change */ 5227 if (mddev->delta_disks) 5228 err = -EBUSY; 5229 else if (mddev->persistent && 5230 mddev->major_version == 0) 5231 err = -EINVAL; 5232 else 5233 mddev->reshape_backwards = backwards; 5234 mddev_unlock(mddev); 5235 return err ?: len; 5236 } 5237 5238 static struct md_sysfs_entry md_reshape_direction = 5239 __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, 5240 reshape_direction_store); 5241 5242 static ssize_t 5243 array_size_show(struct mddev *mddev, char *page) 5244 { 5245 if (mddev->external_size) 5246 return sprintf(page, "%llu\n", 5247 (unsigned long long)mddev->array_sectors/2); 5248 else 5249 return sprintf(page, "default\n"); 5250 } 5251 5252 static ssize_t 5253 array_size_store(struct mddev *mddev, const char *buf, size_t len) 5254 { 5255 sector_t sectors; 5256 int err; 5257 5258 err = mddev_lock(mddev); 5259 if (err) 5260 return err; 5261 5262 /* cluster raid doesn't support change array_sectors */ 5263 if (mddev_is_clustered(mddev)) { 5264 mddev_unlock(mddev); 5265 return -EINVAL; 5266 } 5267 5268 if (strncmp(buf, "default", 7) == 0) { 5269 if (mddev->pers) 5270 sectors = mddev->pers->size(mddev, 0, 0); 5271 else 5272 sectors = mddev->array_sectors; 5273 5274 mddev->external_size = 0; 5275 } else { 5276 if (strict_blocks_to_sectors(buf, §ors) < 0) 5277 err = -EINVAL; 5278 else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) 5279 err = -E2BIG; 5280 else 5281 mddev->external_size = 1; 5282 } 5283 5284 if (!err) { 5285 mddev->array_sectors = sectors; 5286 if (mddev->pers) { 5287 set_capacity(mddev->gendisk, mddev->array_sectors); 5288 revalidate_disk(mddev->gendisk); 5289 } 5290 } 5291 mddev_unlock(mddev); 5292 return err ?: len; 5293 } 5294 5295 static struct md_sysfs_entry md_array_size = 5296 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, 5297 array_size_store); 5298 5299 static ssize_t 5300 consistency_policy_show(struct mddev *mddev, char *page) 5301 { 5302 int ret; 5303 5304 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { 5305 ret = sprintf(page, "journal\n"); 5306 } else if (test_bit(MD_HAS_PPL, &mddev->flags)) { 5307 ret = sprintf(page, "ppl\n"); 5308 } else if (mddev->bitmap) { 5309 ret = sprintf(page, "bitmap\n"); 5310 } else if (mddev->pers) { 5311 if (mddev->pers->sync_request) 5312 ret = sprintf(page, "resync\n"); 5313 else 5314 ret = sprintf(page, "none\n"); 5315 } else { 5316 ret = sprintf(page, "unknown\n"); 5317 } 5318 5319 return ret; 5320 } 5321 5322 static ssize_t 5323 consistency_policy_store(struct mddev *mddev, const char *buf, size_t len) 5324 { 5325 int err = 0; 5326 5327 if (mddev->pers) { 5328 if (mddev->pers->change_consistency_policy) 5329 err = mddev->pers->change_consistency_policy(mddev, buf); 5330 else 5331 err = -EBUSY; 5332 } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) { 5333 set_bit(MD_HAS_PPL, &mddev->flags); 5334 } else { 5335 err = -EINVAL; 5336 } 5337 5338 return err ? err : len; 5339 } 5340 5341 static struct md_sysfs_entry md_consistency_policy = 5342 __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show, 5343 consistency_policy_store); 5344 5345 static ssize_t fail_last_dev_show(struct mddev *mddev, char *page) 5346 { 5347 return sprintf(page, "%d\n", mddev->fail_last_dev); 5348 } 5349 5350 /* 5351 * Setting fail_last_dev to true to allow last device to be forcibly removed 5352 * from RAID1/RAID10. 5353 */ 5354 static ssize_t 5355 fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len) 5356 { 5357 int ret; 5358 bool value; 5359 5360 ret = kstrtobool(buf, &value); 5361 if (ret) 5362 return ret; 5363 5364 if (value != mddev->fail_last_dev) 5365 mddev->fail_last_dev = value; 5366 5367 return len; 5368 } 5369 static struct md_sysfs_entry md_fail_last_dev = 5370 __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show, 5371 fail_last_dev_store); 5372 5373 static ssize_t serialize_policy_show(struct mddev *mddev, char *page) 5374 { 5375 if (mddev->pers == NULL || (mddev->pers->level != 1)) 5376 return sprintf(page, "n/a\n"); 5377 else 5378 return sprintf(page, "%d\n", mddev->serialize_policy); 5379 } 5380 5381 /* 5382 * Setting serialize_policy to true to enforce write IO is not reordered 5383 * for raid1. 5384 */ 5385 static ssize_t 5386 serialize_policy_store(struct mddev *mddev, const char *buf, size_t len) 5387 { 5388 int err; 5389 bool value; 5390 5391 err = kstrtobool(buf, &value); 5392 if (err) 5393 return err; 5394 5395 if (value == mddev->serialize_policy) 5396 return len; 5397 5398 err = mddev_lock(mddev); 5399 if (err) 5400 return err; 5401 if (mddev->pers == NULL || (mddev->pers->level != 1)) { 5402 pr_err("md: serialize_policy is only effective for raid1\n"); 5403 err = -EINVAL; 5404 goto unlock; 5405 } 5406 5407 mddev_suspend(mddev); 5408 if (value) 5409 mddev_create_serial_pool(mddev, NULL, true); 5410 else 5411 mddev_destroy_serial_pool(mddev, NULL, true); 5412 mddev->serialize_policy = value; 5413 mddev_resume(mddev); 5414 unlock: 5415 mddev_unlock(mddev); 5416 return err ?: len; 5417 } 5418 5419 static struct md_sysfs_entry md_serialize_policy = 5420 __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show, 5421 serialize_policy_store); 5422 5423 5424 static struct attribute *md_default_attrs[] = { 5425 &md_level.attr, 5426 &md_layout.attr, 5427 &md_raid_disks.attr, 5428 &md_chunk_size.attr, 5429 &md_size.attr, 5430 &md_resync_start.attr, 5431 &md_metadata.attr, 5432 &md_new_device.attr, 5433 &md_safe_delay.attr, 5434 &md_array_state.attr, 5435 &md_reshape_position.attr, 5436 &md_reshape_direction.attr, 5437 &md_array_size.attr, 5438 &max_corr_read_errors.attr, 5439 &md_consistency_policy.attr, 5440 &md_fail_last_dev.attr, 5441 &md_serialize_policy.attr, 5442 NULL, 5443 }; 5444 5445 static struct attribute *md_redundancy_attrs[] = { 5446 &md_scan_mode.attr, 5447 &md_last_scan_mode.attr, 5448 &md_mismatches.attr, 5449 &md_sync_min.attr, 5450 &md_sync_max.attr, 5451 &md_sync_speed.attr, 5452 &md_sync_force_parallel.attr, 5453 &md_sync_completed.attr, 5454 &md_min_sync.attr, 5455 &md_max_sync.attr, 5456 &md_suspend_lo.attr, 5457 &md_suspend_hi.attr, 5458 &md_bitmap.attr, 5459 &md_degraded.attr, 5460 NULL, 5461 }; 5462 static struct attribute_group md_redundancy_group = { 5463 .name = NULL, 5464 .attrs = md_redundancy_attrs, 5465 }; 5466 5467 static ssize_t 5468 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 5469 { 5470 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 5471 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 5472 ssize_t rv; 5473 5474 if (!entry->show) 5475 return -EIO; 5476 spin_lock(&all_mddevs_lock); 5477 if (list_empty(&mddev->all_mddevs)) { 5478 spin_unlock(&all_mddevs_lock); 5479 return -EBUSY; 5480 } 5481 mddev_get(mddev); 5482 spin_unlock(&all_mddevs_lock); 5483 5484 rv = entry->show(mddev, page); 5485 mddev_put(mddev); 5486 return rv; 5487 } 5488 5489 static ssize_t 5490 md_attr_store(struct kobject *kobj, struct attribute *attr, 5491 const char *page, size_t length) 5492 { 5493 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 5494 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 5495 ssize_t rv; 5496 5497 if (!entry->store) 5498 return -EIO; 5499 if (!capable(CAP_SYS_ADMIN)) 5500 return -EACCES; 5501 spin_lock(&all_mddevs_lock); 5502 if (list_empty(&mddev->all_mddevs)) { 5503 spin_unlock(&all_mddevs_lock); 5504 return -EBUSY; 5505 } 5506 mddev_get(mddev); 5507 spin_unlock(&all_mddevs_lock); 5508 rv = entry->store(mddev, page, length); 5509 mddev_put(mddev); 5510 return rv; 5511 } 5512 5513 static void md_free(struct kobject *ko) 5514 { 5515 struct mddev *mddev = container_of(ko, struct mddev, kobj); 5516 5517 if (mddev->sysfs_state) 5518 sysfs_put(mddev->sysfs_state); 5519 5520 if (mddev->gendisk) 5521 del_gendisk(mddev->gendisk); 5522 if (mddev->queue) 5523 blk_cleanup_queue(mddev->queue); 5524 if (mddev->gendisk) 5525 put_disk(mddev->gendisk); 5526 percpu_ref_exit(&mddev->writes_pending); 5527 5528 bioset_exit(&mddev->bio_set); 5529 bioset_exit(&mddev->sync_set); 5530 kfree(mddev); 5531 } 5532 5533 static const struct sysfs_ops md_sysfs_ops = { 5534 .show = md_attr_show, 5535 .store = md_attr_store, 5536 }; 5537 static struct kobj_type md_ktype = { 5538 .release = md_free, 5539 .sysfs_ops = &md_sysfs_ops, 5540 .default_attrs = md_default_attrs, 5541 }; 5542 5543 int mdp_major = 0; 5544 5545 static void mddev_delayed_delete(struct work_struct *ws) 5546 { 5547 struct mddev *mddev = container_of(ws, struct mddev, del_work); 5548 5549 sysfs_remove_group(&mddev->kobj, &md_bitmap_group); 5550 kobject_del(&mddev->kobj); 5551 kobject_put(&mddev->kobj); 5552 } 5553 5554 static void no_op(struct percpu_ref *r) {} 5555 5556 int mddev_init_writes_pending(struct mddev *mddev) 5557 { 5558 if (mddev->writes_pending.percpu_count_ptr) 5559 return 0; 5560 if (percpu_ref_init(&mddev->writes_pending, no_op, 5561 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0) 5562 return -ENOMEM; 5563 /* We want to start with the refcount at zero */ 5564 percpu_ref_put(&mddev->writes_pending); 5565 return 0; 5566 } 5567 EXPORT_SYMBOL_GPL(mddev_init_writes_pending); 5568 5569 static int md_alloc(dev_t dev, char *name) 5570 { 5571 /* 5572 * If dev is zero, name is the name of a device to allocate with 5573 * an arbitrary minor number. It will be "md_???" 5574 * If dev is non-zero it must be a device number with a MAJOR of 5575 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then 5576 * the device is being created by opening a node in /dev. 5577 * If "name" is not NULL, the device is being created by 5578 * writing to /sys/module/md_mod/parameters/new_array. 5579 */ 5580 static DEFINE_MUTEX(disks_mutex); 5581 struct mddev *mddev = mddev_find(dev); 5582 struct gendisk *disk; 5583 int partitioned; 5584 int shift; 5585 int unit; 5586 int error; 5587 5588 if (!mddev) 5589 return -ENODEV; 5590 5591 partitioned = (MAJOR(mddev->unit) != MD_MAJOR); 5592 shift = partitioned ? MdpMinorShift : 0; 5593 unit = MINOR(mddev->unit) >> shift; 5594 5595 /* wait for any previous instance of this device to be 5596 * completely removed (mddev_delayed_delete). 5597 */ 5598 flush_workqueue(md_misc_wq); 5599 5600 mutex_lock(&disks_mutex); 5601 error = -EEXIST; 5602 if (mddev->gendisk) 5603 goto abort; 5604 5605 if (name && !dev) { 5606 /* Need to ensure that 'name' is not a duplicate. 5607 */ 5608 struct mddev *mddev2; 5609 spin_lock(&all_mddevs_lock); 5610 5611 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) 5612 if (mddev2->gendisk && 5613 strcmp(mddev2->gendisk->disk_name, name) == 0) { 5614 spin_unlock(&all_mddevs_lock); 5615 goto abort; 5616 } 5617 spin_unlock(&all_mddevs_lock); 5618 } 5619 if (name && dev) 5620 /* 5621 * Creating /dev/mdNNN via "newarray", so adjust hold_active. 5622 */ 5623 mddev->hold_active = UNTIL_STOP; 5624 5625 error = -ENOMEM; 5626 mddev->queue = blk_alloc_queue(GFP_KERNEL); 5627 if (!mddev->queue) 5628 goto abort; 5629 mddev->queue->queuedata = mddev; 5630 5631 blk_queue_make_request(mddev->queue, md_make_request); 5632 blk_set_stacking_limits(&mddev->queue->limits); 5633 5634 disk = alloc_disk(1 << shift); 5635 if (!disk) { 5636 blk_cleanup_queue(mddev->queue); 5637 mddev->queue = NULL; 5638 goto abort; 5639 } 5640 disk->major = MAJOR(mddev->unit); 5641 disk->first_minor = unit << shift; 5642 if (name) 5643 strcpy(disk->disk_name, name); 5644 else if (partitioned) 5645 sprintf(disk->disk_name, "md_d%d", unit); 5646 else 5647 sprintf(disk->disk_name, "md%d", unit); 5648 disk->fops = &md_fops; 5649 disk->private_data = mddev; 5650 disk->queue = mddev->queue; 5651 blk_queue_write_cache(mddev->queue, true, true); 5652 /* Allow extended partitions. This makes the 5653 * 'mdp' device redundant, but we can't really 5654 * remove it now. 5655 */ 5656 disk->flags |= GENHD_FL_EXT_DEVT; 5657 mddev->gendisk = disk; 5658 /* As soon as we call add_disk(), another thread could get 5659 * through to md_open, so make sure it doesn't get too far 5660 */ 5661 mutex_lock(&mddev->open_mutex); 5662 add_disk(disk); 5663 5664 error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md"); 5665 if (error) { 5666 /* This isn't possible, but as kobject_init_and_add is marked 5667 * __must_check, we must do something with the result 5668 */ 5669 pr_debug("md: cannot register %s/md - name in use\n", 5670 disk->disk_name); 5671 error = 0; 5672 } 5673 if (mddev->kobj.sd && 5674 sysfs_create_group(&mddev->kobj, &md_bitmap_group)) 5675 pr_debug("pointless warning\n"); 5676 mutex_unlock(&mddev->open_mutex); 5677 abort: 5678 mutex_unlock(&disks_mutex); 5679 if (!error && mddev->kobj.sd) { 5680 kobject_uevent(&mddev->kobj, KOBJ_ADD); 5681 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); 5682 } 5683 mddev_put(mddev); 5684 return error; 5685 } 5686 5687 static struct kobject *md_probe(dev_t dev, int *part, void *data) 5688 { 5689 if (create_on_open) 5690 md_alloc(dev, NULL); 5691 return NULL; 5692 } 5693 5694 static int add_named_array(const char *val, const struct kernel_param *kp) 5695 { 5696 /* 5697 * val must be "md_*" or "mdNNN". 5698 * For "md_*" we allocate an array with a large free minor number, and 5699 * set the name to val. val must not already be an active name. 5700 * For "mdNNN" we allocate an array with the minor number NNN 5701 * which must not already be in use. 5702 */ 5703 int len = strlen(val); 5704 char buf[DISK_NAME_LEN]; 5705 unsigned long devnum; 5706 5707 while (len && val[len-1] == '\n') 5708 len--; 5709 if (len >= DISK_NAME_LEN) 5710 return -E2BIG; 5711 strlcpy(buf, val, len+1); 5712 if (strncmp(buf, "md_", 3) == 0) 5713 return md_alloc(0, buf); 5714 if (strncmp(buf, "md", 2) == 0 && 5715 isdigit(buf[2]) && 5716 kstrtoul(buf+2, 10, &devnum) == 0 && 5717 devnum <= MINORMASK) 5718 return md_alloc(MKDEV(MD_MAJOR, devnum), NULL); 5719 5720 return -EINVAL; 5721 } 5722 5723 static void md_safemode_timeout(struct timer_list *t) 5724 { 5725 struct mddev *mddev = from_timer(mddev, t, safemode_timer); 5726 5727 mddev->safemode = 1; 5728 if (mddev->external) 5729 sysfs_notify_dirent_safe(mddev->sysfs_state); 5730 5731 md_wakeup_thread(mddev->thread); 5732 } 5733 5734 static int start_dirty_degraded; 5735 5736 int md_run(struct mddev *mddev) 5737 { 5738 int err; 5739 struct md_rdev *rdev; 5740 struct md_personality *pers; 5741 5742 if (list_empty(&mddev->disks)) 5743 /* cannot run an array with no devices.. */ 5744 return -EINVAL; 5745 5746 if (mddev->pers) 5747 return -EBUSY; 5748 /* Cannot run until previous stop completes properly */ 5749 if (mddev->sysfs_active) 5750 return -EBUSY; 5751 5752 /* 5753 * Analyze all RAID superblock(s) 5754 */ 5755 if (!mddev->raid_disks) { 5756 if (!mddev->persistent) 5757 return -EINVAL; 5758 err = analyze_sbs(mddev); 5759 if (err) 5760 return -EINVAL; 5761 } 5762 5763 if (mddev->level != LEVEL_NONE) 5764 request_module("md-level-%d", mddev->level); 5765 else if (mddev->clevel[0]) 5766 request_module("md-%s", mddev->clevel); 5767 5768 /* 5769 * Drop all container device buffers, from now on 5770 * the only valid external interface is through the md 5771 * device. 5772 */ 5773 mddev->has_superblocks = false; 5774 rdev_for_each(rdev, mddev) { 5775 if (test_bit(Faulty, &rdev->flags)) 5776 continue; 5777 sync_blockdev(rdev->bdev); 5778 invalidate_bdev(rdev->bdev); 5779 if (mddev->ro != 1 && 5780 (bdev_read_only(rdev->bdev) || 5781 bdev_read_only(rdev->meta_bdev))) { 5782 mddev->ro = 1; 5783 if (mddev->gendisk) 5784 set_disk_ro(mddev->gendisk, 1); 5785 } 5786 5787 if (rdev->sb_page) 5788 mddev->has_superblocks = true; 5789 5790 /* perform some consistency tests on the device. 5791 * We don't want the data to overlap the metadata, 5792 * Internal Bitmap issues have been handled elsewhere. 5793 */ 5794 if (rdev->meta_bdev) { 5795 /* Nothing to check */; 5796 } else if (rdev->data_offset < rdev->sb_start) { 5797 if (mddev->dev_sectors && 5798 rdev->data_offset + mddev->dev_sectors 5799 > rdev->sb_start) { 5800 pr_warn("md: %s: data overlaps metadata\n", 5801 mdname(mddev)); 5802 return -EINVAL; 5803 } 5804 } else { 5805 if (rdev->sb_start + rdev->sb_size/512 5806 > rdev->data_offset) { 5807 pr_warn("md: %s: metadata overlaps data\n", 5808 mdname(mddev)); 5809 return -EINVAL; 5810 } 5811 } 5812 sysfs_notify_dirent_safe(rdev->sysfs_state); 5813 } 5814 5815 if (!bioset_initialized(&mddev->bio_set)) { 5816 err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); 5817 if (err) 5818 return err; 5819 } 5820 if (!bioset_initialized(&mddev->sync_set)) { 5821 err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); 5822 if (err) 5823 return err; 5824 } 5825 5826 spin_lock(&pers_lock); 5827 pers = find_pers(mddev->level, mddev->clevel); 5828 if (!pers || !try_module_get(pers->owner)) { 5829 spin_unlock(&pers_lock); 5830 if (mddev->level != LEVEL_NONE) 5831 pr_warn("md: personality for level %d is not loaded!\n", 5832 mddev->level); 5833 else 5834 pr_warn("md: personality for level %s is not loaded!\n", 5835 mddev->clevel); 5836 err = -EINVAL; 5837 goto abort; 5838 } 5839 spin_unlock(&pers_lock); 5840 if (mddev->level != pers->level) { 5841 mddev->level = pers->level; 5842 mddev->new_level = pers->level; 5843 } 5844 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 5845 5846 if (mddev->reshape_position != MaxSector && 5847 pers->start_reshape == NULL) { 5848 /* This personality cannot handle reshaping... */ 5849 module_put(pers->owner); 5850 err = -EINVAL; 5851 goto abort; 5852 } 5853 5854 if (pers->sync_request) { 5855 /* Warn if this is a potentially silly 5856 * configuration. 5857 */ 5858 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 5859 struct md_rdev *rdev2; 5860 int warned = 0; 5861 5862 rdev_for_each(rdev, mddev) 5863 rdev_for_each(rdev2, mddev) { 5864 if (rdev < rdev2 && 5865 rdev->bdev->bd_contains == 5866 rdev2->bdev->bd_contains) { 5867 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n", 5868 mdname(mddev), 5869 bdevname(rdev->bdev,b), 5870 bdevname(rdev2->bdev,b2)); 5871 warned = 1; 5872 } 5873 } 5874 5875 if (warned) 5876 pr_warn("True protection against single-disk failure might be compromised.\n"); 5877 } 5878 5879 mddev->recovery = 0; 5880 /* may be over-ridden by personality */ 5881 mddev->resync_max_sectors = mddev->dev_sectors; 5882 5883 mddev->ok_start_degraded = start_dirty_degraded; 5884 5885 if (start_readonly && mddev->ro == 0) 5886 mddev->ro = 2; /* read-only, but switch on first write */ 5887 5888 err = pers->run(mddev); 5889 if (err) 5890 pr_warn("md: pers->run() failed ...\n"); 5891 else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { 5892 WARN_ONCE(!mddev->external_size, 5893 "%s: default size too small, but 'external_size' not in effect?\n", 5894 __func__); 5895 pr_warn("md: invalid array_size %llu > default size %llu\n", 5896 (unsigned long long)mddev->array_sectors / 2, 5897 (unsigned long long)pers->size(mddev, 0, 0) / 2); 5898 err = -EINVAL; 5899 } 5900 if (err == 0 && pers->sync_request && 5901 (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { 5902 struct bitmap *bitmap; 5903 5904 bitmap = md_bitmap_create(mddev, -1); 5905 if (IS_ERR(bitmap)) { 5906 err = PTR_ERR(bitmap); 5907 pr_warn("%s: failed to create bitmap (%d)\n", 5908 mdname(mddev), err); 5909 } else 5910 mddev->bitmap = bitmap; 5911 5912 } 5913 if (err) 5914 goto bitmap_abort; 5915 5916 if (mddev->bitmap_info.max_write_behind > 0) { 5917 bool create_pool = false; 5918 5919 rdev_for_each(rdev, mddev) { 5920 if (test_bit(WriteMostly, &rdev->flags) && 5921 rdev_init_serial(rdev)) 5922 create_pool = true; 5923 } 5924 if (create_pool && mddev->serial_info_pool == NULL) { 5925 mddev->serial_info_pool = 5926 mempool_create_kmalloc_pool(NR_SERIAL_INFOS, 5927 sizeof(struct serial_info)); 5928 if (!mddev->serial_info_pool) { 5929 err = -ENOMEM; 5930 goto bitmap_abort; 5931 } 5932 } 5933 } 5934 5935 if (mddev->queue) { 5936 bool nonrot = true; 5937 5938 rdev_for_each(rdev, mddev) { 5939 if (rdev->raid_disk >= 0 && 5940 !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { 5941 nonrot = false; 5942 break; 5943 } 5944 } 5945 if (mddev->degraded) 5946 nonrot = false; 5947 if (nonrot) 5948 blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue); 5949 else 5950 blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue); 5951 mddev->queue->backing_dev_info->congested_data = mddev; 5952 mddev->queue->backing_dev_info->congested_fn = md_congested; 5953 } 5954 if (pers->sync_request) { 5955 if (mddev->kobj.sd && 5956 sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 5957 pr_warn("md: cannot register extra attributes for %s\n", 5958 mdname(mddev)); 5959 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); 5960 } else if (mddev->ro == 2) /* auto-readonly not meaningful */ 5961 mddev->ro = 0; 5962 5963 atomic_set(&mddev->max_corr_read_errors, 5964 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); 5965 mddev->safemode = 0; 5966 if (mddev_is_clustered(mddev)) 5967 mddev->safemode_delay = 0; 5968 else 5969 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ 5970 mddev->in_sync = 1; 5971 smp_wmb(); 5972 spin_lock(&mddev->lock); 5973 mddev->pers = pers; 5974 spin_unlock(&mddev->lock); 5975 rdev_for_each(rdev, mddev) 5976 if (rdev->raid_disk >= 0) 5977 sysfs_link_rdev(mddev, rdev); /* failure here is OK */ 5978 5979 if (mddev->degraded && !mddev->ro) 5980 /* This ensures that recovering status is reported immediately 5981 * via sysfs - until a lack of spares is confirmed. 5982 */ 5983 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 5984 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5985 5986 if (mddev->sb_flags) 5987 md_update_sb(mddev, 0); 5988 5989 md_new_event(mddev); 5990 return 0; 5991 5992 bitmap_abort: 5993 mddev_detach(mddev); 5994 if (mddev->private) 5995 pers->free(mddev, mddev->private); 5996 mddev->private = NULL; 5997 module_put(pers->owner); 5998 md_bitmap_destroy(mddev); 5999 abort: 6000 bioset_exit(&mddev->bio_set); 6001 bioset_exit(&mddev->sync_set); 6002 return err; 6003 } 6004 EXPORT_SYMBOL_GPL(md_run); 6005 6006 static int do_md_run(struct mddev *mddev) 6007 { 6008 int err; 6009 6010 set_bit(MD_NOT_READY, &mddev->flags); 6011 err = md_run(mddev); 6012 if (err) 6013 goto out; 6014 err = md_bitmap_load(mddev); 6015 if (err) { 6016 md_bitmap_destroy(mddev); 6017 goto out; 6018 } 6019 6020 if (mddev_is_clustered(mddev)) 6021 md_allow_write(mddev); 6022 6023 /* run start up tasks that require md_thread */ 6024 md_start(mddev); 6025 6026 md_wakeup_thread(mddev->thread); 6027 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 6028 6029 set_capacity(mddev->gendisk, mddev->array_sectors); 6030 revalidate_disk(mddev->gendisk); 6031 clear_bit(MD_NOT_READY, &mddev->flags); 6032 mddev->changed = 1; 6033 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 6034 sysfs_notify_dirent_safe(mddev->sysfs_state); 6035 sysfs_notify_dirent_safe(mddev->sysfs_action); 6036 sysfs_notify(&mddev->kobj, NULL, "degraded"); 6037 out: 6038 clear_bit(MD_NOT_READY, &mddev->flags); 6039 return err; 6040 } 6041 6042 int md_start(struct mddev *mddev) 6043 { 6044 int ret = 0; 6045 6046 if (mddev->pers->start) { 6047 set_bit(MD_RECOVERY_WAIT, &mddev->recovery); 6048 md_wakeup_thread(mddev->thread); 6049 ret = mddev->pers->start(mddev); 6050 clear_bit(MD_RECOVERY_WAIT, &mddev->recovery); 6051 md_wakeup_thread(mddev->sync_thread); 6052 } 6053 return ret; 6054 } 6055 EXPORT_SYMBOL_GPL(md_start); 6056 6057 static int restart_array(struct mddev *mddev) 6058 { 6059 struct gendisk *disk = mddev->gendisk; 6060 struct md_rdev *rdev; 6061 bool has_journal = false; 6062 bool has_readonly = false; 6063 6064 /* Complain if it has no devices */ 6065 if (list_empty(&mddev->disks)) 6066 return -ENXIO; 6067 if (!mddev->pers) 6068 return -EINVAL; 6069 if (!mddev->ro) 6070 return -EBUSY; 6071 6072 rcu_read_lock(); 6073 rdev_for_each_rcu(rdev, mddev) { 6074 if (test_bit(Journal, &rdev->flags) && 6075 !test_bit(Faulty, &rdev->flags)) 6076 has_journal = true; 6077 if (bdev_read_only(rdev->bdev)) 6078 has_readonly = true; 6079 } 6080 rcu_read_unlock(); 6081 if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal) 6082 /* Don't restart rw with journal missing/faulty */ 6083 return -EINVAL; 6084 if (has_readonly) 6085 return -EROFS; 6086 6087 mddev->safemode = 0; 6088 mddev->ro = 0; 6089 set_disk_ro(disk, 0); 6090 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev)); 6091 /* Kick recovery or resync if necessary */ 6092 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6093 md_wakeup_thread(mddev->thread); 6094 md_wakeup_thread(mddev->sync_thread); 6095 sysfs_notify_dirent_safe(mddev->sysfs_state); 6096 return 0; 6097 } 6098 6099 static void md_clean(struct mddev *mddev) 6100 { 6101 mddev->array_sectors = 0; 6102 mddev->external_size = 0; 6103 mddev->dev_sectors = 0; 6104 mddev->raid_disks = 0; 6105 mddev->recovery_cp = 0; 6106 mddev->resync_min = 0; 6107 mddev->resync_max = MaxSector; 6108 mddev->reshape_position = MaxSector; 6109 mddev->external = 0; 6110 mddev->persistent = 0; 6111 mddev->level = LEVEL_NONE; 6112 mddev->clevel[0] = 0; 6113 mddev->flags = 0; 6114 mddev->sb_flags = 0; 6115 mddev->ro = 0; 6116 mddev->metadata_type[0] = 0; 6117 mddev->chunk_sectors = 0; 6118 mddev->ctime = mddev->utime = 0; 6119 mddev->layout = 0; 6120 mddev->max_disks = 0; 6121 mddev->events = 0; 6122 mddev->can_decrease_events = 0; 6123 mddev->delta_disks = 0; 6124 mddev->reshape_backwards = 0; 6125 mddev->new_level = LEVEL_NONE; 6126 mddev->new_layout = 0; 6127 mddev->new_chunk_sectors = 0; 6128 mddev->curr_resync = 0; 6129 atomic64_set(&mddev->resync_mismatches, 0); 6130 mddev->suspend_lo = mddev->suspend_hi = 0; 6131 mddev->sync_speed_min = mddev->sync_speed_max = 0; 6132 mddev->recovery = 0; 6133 mddev->in_sync = 0; 6134 mddev->changed = 0; 6135 mddev->degraded = 0; 6136 mddev->safemode = 0; 6137 mddev->private = NULL; 6138 mddev->cluster_info = NULL; 6139 mddev->bitmap_info.offset = 0; 6140 mddev->bitmap_info.default_offset = 0; 6141 mddev->bitmap_info.default_space = 0; 6142 mddev->bitmap_info.chunksize = 0; 6143 mddev->bitmap_info.daemon_sleep = 0; 6144 mddev->bitmap_info.max_write_behind = 0; 6145 mddev->bitmap_info.nodes = 0; 6146 } 6147 6148 static void __md_stop_writes(struct mddev *mddev) 6149 { 6150 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 6151 flush_workqueue(md_misc_wq); 6152 if (mddev->sync_thread) { 6153 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6154 md_reap_sync_thread(mddev); 6155 } 6156 6157 del_timer_sync(&mddev->safemode_timer); 6158 6159 if (mddev->pers && mddev->pers->quiesce) { 6160 mddev->pers->quiesce(mddev, 1); 6161 mddev->pers->quiesce(mddev, 0); 6162 } 6163 md_bitmap_flush(mddev); 6164 6165 if (mddev->ro == 0 && 6166 ((!mddev->in_sync && !mddev_is_clustered(mddev)) || 6167 mddev->sb_flags)) { 6168 /* mark array as shutdown cleanly */ 6169 if (!mddev_is_clustered(mddev)) 6170 mddev->in_sync = 1; 6171 md_update_sb(mddev, 1); 6172 } 6173 /* disable policy to guarantee rdevs free resources for serialization */ 6174 mddev->serialize_policy = 0; 6175 mddev_destroy_serial_pool(mddev, NULL, true); 6176 } 6177 6178 void md_stop_writes(struct mddev *mddev) 6179 { 6180 mddev_lock_nointr(mddev); 6181 __md_stop_writes(mddev); 6182 mddev_unlock(mddev); 6183 } 6184 EXPORT_SYMBOL_GPL(md_stop_writes); 6185 6186 static void mddev_detach(struct mddev *mddev) 6187 { 6188 md_bitmap_wait_behind_writes(mddev); 6189 if (mddev->pers && mddev->pers->quiesce) { 6190 mddev->pers->quiesce(mddev, 1); 6191 mddev->pers->quiesce(mddev, 0); 6192 } 6193 md_unregister_thread(&mddev->thread); 6194 if (mddev->queue) 6195 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ 6196 } 6197 6198 static void __md_stop(struct mddev *mddev) 6199 { 6200 struct md_personality *pers = mddev->pers; 6201 md_bitmap_destroy(mddev); 6202 mddev_detach(mddev); 6203 /* Ensure ->event_work is done */ 6204 flush_workqueue(md_misc_wq); 6205 spin_lock(&mddev->lock); 6206 mddev->pers = NULL; 6207 spin_unlock(&mddev->lock); 6208 pers->free(mddev, mddev->private); 6209 mddev->private = NULL; 6210 if (pers->sync_request && mddev->to_remove == NULL) 6211 mddev->to_remove = &md_redundancy_group; 6212 module_put(pers->owner); 6213 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 6214 } 6215 6216 void md_stop(struct mddev *mddev) 6217 { 6218 /* stop the array and free an attached data structures. 6219 * This is called from dm-raid 6220 */ 6221 __md_stop(mddev); 6222 bioset_exit(&mddev->bio_set); 6223 bioset_exit(&mddev->sync_set); 6224 } 6225 6226 EXPORT_SYMBOL_GPL(md_stop); 6227 6228 static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) 6229 { 6230 int err = 0; 6231 int did_freeze = 0; 6232 6233 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { 6234 did_freeze = 1; 6235 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 6236 md_wakeup_thread(mddev->thread); 6237 } 6238 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 6239 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6240 if (mddev->sync_thread) 6241 /* Thread might be blocked waiting for metadata update 6242 * which will now never happen */ 6243 wake_up_process(mddev->sync_thread->tsk); 6244 6245 if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 6246 return -EBUSY; 6247 mddev_unlock(mddev); 6248 wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, 6249 &mddev->recovery)); 6250 wait_event(mddev->sb_wait, 6251 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); 6252 mddev_lock_nointr(mddev); 6253 6254 mutex_lock(&mddev->open_mutex); 6255 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || 6256 mddev->sync_thread || 6257 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { 6258 pr_warn("md: %s still in use.\n",mdname(mddev)); 6259 if (did_freeze) { 6260 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 6261 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6262 md_wakeup_thread(mddev->thread); 6263 } 6264 err = -EBUSY; 6265 goto out; 6266 } 6267 if (mddev->pers) { 6268 __md_stop_writes(mddev); 6269 6270 err = -ENXIO; 6271 if (mddev->ro==1) 6272 goto out; 6273 mddev->ro = 1; 6274 set_disk_ro(mddev->gendisk, 1); 6275 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 6276 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6277 md_wakeup_thread(mddev->thread); 6278 sysfs_notify_dirent_safe(mddev->sysfs_state); 6279 err = 0; 6280 } 6281 out: 6282 mutex_unlock(&mddev->open_mutex); 6283 return err; 6284 } 6285 6286 /* mode: 6287 * 0 - completely stop and dis-assemble array 6288 * 2 - stop but do not disassemble array 6289 */ 6290 static int do_md_stop(struct mddev *mddev, int mode, 6291 struct block_device *bdev) 6292 { 6293 struct gendisk *disk = mddev->gendisk; 6294 struct md_rdev *rdev; 6295 int did_freeze = 0; 6296 6297 if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { 6298 did_freeze = 1; 6299 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 6300 md_wakeup_thread(mddev->thread); 6301 } 6302 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 6303 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6304 if (mddev->sync_thread) 6305 /* Thread might be blocked waiting for metadata update 6306 * which will now never happen */ 6307 wake_up_process(mddev->sync_thread->tsk); 6308 6309 mddev_unlock(mddev); 6310 wait_event(resync_wait, (mddev->sync_thread == NULL && 6311 !test_bit(MD_RECOVERY_RUNNING, 6312 &mddev->recovery))); 6313 mddev_lock_nointr(mddev); 6314 6315 mutex_lock(&mddev->open_mutex); 6316 if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || 6317 mddev->sysfs_active || 6318 mddev->sync_thread || 6319 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { 6320 pr_warn("md: %s still in use.\n",mdname(mddev)); 6321 mutex_unlock(&mddev->open_mutex); 6322 if (did_freeze) { 6323 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 6324 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6325 md_wakeup_thread(mddev->thread); 6326 } 6327 return -EBUSY; 6328 } 6329 if (mddev->pers) { 6330 if (mddev->ro) 6331 set_disk_ro(disk, 0); 6332 6333 __md_stop_writes(mddev); 6334 __md_stop(mddev); 6335 mddev->queue->backing_dev_info->congested_fn = NULL; 6336 6337 /* tell userspace to handle 'inactive' */ 6338 sysfs_notify_dirent_safe(mddev->sysfs_state); 6339 6340 rdev_for_each(rdev, mddev) 6341 if (rdev->raid_disk >= 0) 6342 sysfs_unlink_rdev(mddev, rdev); 6343 6344 set_capacity(disk, 0); 6345 mutex_unlock(&mddev->open_mutex); 6346 mddev->changed = 1; 6347 revalidate_disk(disk); 6348 6349 if (mddev->ro) 6350 mddev->ro = 0; 6351 } else 6352 mutex_unlock(&mddev->open_mutex); 6353 /* 6354 * Free resources if final stop 6355 */ 6356 if (mode == 0) { 6357 pr_info("md: %s stopped.\n", mdname(mddev)); 6358 6359 if (mddev->bitmap_info.file) { 6360 struct file *f = mddev->bitmap_info.file; 6361 spin_lock(&mddev->lock); 6362 mddev->bitmap_info.file = NULL; 6363 spin_unlock(&mddev->lock); 6364 fput(f); 6365 } 6366 mddev->bitmap_info.offset = 0; 6367 6368 export_array(mddev); 6369 6370 md_clean(mddev); 6371 if (mddev->hold_active == UNTIL_STOP) 6372 mddev->hold_active = 0; 6373 } 6374 md_new_event(mddev); 6375 sysfs_notify_dirent_safe(mddev->sysfs_state); 6376 return 0; 6377 } 6378 6379 #ifndef MODULE 6380 static void autorun_array(struct mddev *mddev) 6381 { 6382 struct md_rdev *rdev; 6383 int err; 6384 6385 if (list_empty(&mddev->disks)) 6386 return; 6387 6388 pr_info("md: running: "); 6389 6390 rdev_for_each(rdev, mddev) { 6391 char b[BDEVNAME_SIZE]; 6392 pr_cont("<%s>", bdevname(rdev->bdev,b)); 6393 } 6394 pr_cont("\n"); 6395 6396 err = do_md_run(mddev); 6397 if (err) { 6398 pr_warn("md: do_md_run() returned %d\n", err); 6399 do_md_stop(mddev, 0, NULL); 6400 } 6401 } 6402 6403 /* 6404 * lets try to run arrays based on all disks that have arrived 6405 * until now. (those are in pending_raid_disks) 6406 * 6407 * the method: pick the first pending disk, collect all disks with 6408 * the same UUID, remove all from the pending list and put them into 6409 * the 'same_array' list. Then order this list based on superblock 6410 * update time (freshest comes first), kick out 'old' disks and 6411 * compare superblocks. If everything's fine then run it. 6412 * 6413 * If "unit" is allocated, then bump its reference count 6414 */ 6415 static void autorun_devices(int part) 6416 { 6417 struct md_rdev *rdev0, *rdev, *tmp; 6418 struct mddev *mddev; 6419 char b[BDEVNAME_SIZE]; 6420 6421 pr_info("md: autorun ...\n"); 6422 while (!list_empty(&pending_raid_disks)) { 6423 int unit; 6424 dev_t dev; 6425 LIST_HEAD(candidates); 6426 rdev0 = list_entry(pending_raid_disks.next, 6427 struct md_rdev, same_set); 6428 6429 pr_debug("md: considering %s ...\n", bdevname(rdev0->bdev,b)); 6430 INIT_LIST_HEAD(&candidates); 6431 rdev_for_each_list(rdev, tmp, &pending_raid_disks) 6432 if (super_90_load(rdev, rdev0, 0) >= 0) { 6433 pr_debug("md: adding %s ...\n", 6434 bdevname(rdev->bdev,b)); 6435 list_move(&rdev->same_set, &candidates); 6436 } 6437 /* 6438 * now we have a set of devices, with all of them having 6439 * mostly sane superblocks. It's time to allocate the 6440 * mddev. 6441 */ 6442 if (part) { 6443 dev = MKDEV(mdp_major, 6444 rdev0->preferred_minor << MdpMinorShift); 6445 unit = MINOR(dev) >> MdpMinorShift; 6446 } else { 6447 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 6448 unit = MINOR(dev); 6449 } 6450 if (rdev0->preferred_minor != unit) { 6451 pr_warn("md: unit number in %s is bad: %d\n", 6452 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 6453 break; 6454 } 6455 6456 md_probe(dev, NULL, NULL); 6457 mddev = mddev_find(dev); 6458 if (!mddev || !mddev->gendisk) { 6459 if (mddev) 6460 mddev_put(mddev); 6461 break; 6462 } 6463 if (mddev_lock(mddev)) 6464 pr_warn("md: %s locked, cannot run\n", mdname(mddev)); 6465 else if (mddev->raid_disks || mddev->major_version 6466 || !list_empty(&mddev->disks)) { 6467 pr_warn("md: %s already running, cannot run %s\n", 6468 mdname(mddev), bdevname(rdev0->bdev,b)); 6469 mddev_unlock(mddev); 6470 } else { 6471 pr_debug("md: created %s\n", mdname(mddev)); 6472 mddev->persistent = 1; 6473 rdev_for_each_list(rdev, tmp, &candidates) { 6474 list_del_init(&rdev->same_set); 6475 if (bind_rdev_to_array(rdev, mddev)) 6476 export_rdev(rdev); 6477 } 6478 autorun_array(mddev); 6479 mddev_unlock(mddev); 6480 } 6481 /* on success, candidates will be empty, on error 6482 * it won't... 6483 */ 6484 rdev_for_each_list(rdev, tmp, &candidates) { 6485 list_del_init(&rdev->same_set); 6486 export_rdev(rdev); 6487 } 6488 mddev_put(mddev); 6489 } 6490 pr_info("md: ... autorun DONE.\n"); 6491 } 6492 #endif /* !MODULE */ 6493 6494 static int get_version(void __user *arg) 6495 { 6496 mdu_version_t ver; 6497 6498 ver.major = MD_MAJOR_VERSION; 6499 ver.minor = MD_MINOR_VERSION; 6500 ver.patchlevel = MD_PATCHLEVEL_VERSION; 6501 6502 if (copy_to_user(arg, &ver, sizeof(ver))) 6503 return -EFAULT; 6504 6505 return 0; 6506 } 6507 6508 static int get_array_info(struct mddev *mddev, void __user *arg) 6509 { 6510 mdu_array_info_t info; 6511 int nr,working,insync,failed,spare; 6512 struct md_rdev *rdev; 6513 6514 nr = working = insync = failed = spare = 0; 6515 rcu_read_lock(); 6516 rdev_for_each_rcu(rdev, mddev) { 6517 nr++; 6518 if (test_bit(Faulty, &rdev->flags)) 6519 failed++; 6520 else { 6521 working++; 6522 if (test_bit(In_sync, &rdev->flags)) 6523 insync++; 6524 else if (test_bit(Journal, &rdev->flags)) 6525 /* TODO: add journal count to md_u.h */ 6526 ; 6527 else 6528 spare++; 6529 } 6530 } 6531 rcu_read_unlock(); 6532 6533 info.major_version = mddev->major_version; 6534 info.minor_version = mddev->minor_version; 6535 info.patch_version = MD_PATCHLEVEL_VERSION; 6536 info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); 6537 info.level = mddev->level; 6538 info.size = mddev->dev_sectors / 2; 6539 if (info.size != mddev->dev_sectors / 2) /* overflow */ 6540 info.size = -1; 6541 info.nr_disks = nr; 6542 info.raid_disks = mddev->raid_disks; 6543 info.md_minor = mddev->md_minor; 6544 info.not_persistent= !mddev->persistent; 6545 6546 info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); 6547 info.state = 0; 6548 if (mddev->in_sync) 6549 info.state = (1<<MD_SB_CLEAN); 6550 if (mddev->bitmap && mddev->bitmap_info.offset) 6551 info.state |= (1<<MD_SB_BITMAP_PRESENT); 6552 if (mddev_is_clustered(mddev)) 6553 info.state |= (1<<MD_SB_CLUSTERED); 6554 info.active_disks = insync; 6555 info.working_disks = working; 6556 info.failed_disks = failed; 6557 info.spare_disks = spare; 6558 6559 info.layout = mddev->layout; 6560 info.chunk_size = mddev->chunk_sectors << 9; 6561 6562 if (copy_to_user(arg, &info, sizeof(info))) 6563 return -EFAULT; 6564 6565 return 0; 6566 } 6567 6568 static int get_bitmap_file(struct mddev *mddev, void __user * arg) 6569 { 6570 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 6571 char *ptr; 6572 int err; 6573 6574 file = kzalloc(sizeof(*file), GFP_NOIO); 6575 if (!file) 6576 return -ENOMEM; 6577 6578 err = 0; 6579 spin_lock(&mddev->lock); 6580 /* bitmap enabled */ 6581 if (mddev->bitmap_info.file) { 6582 ptr = file_path(mddev->bitmap_info.file, file->pathname, 6583 sizeof(file->pathname)); 6584 if (IS_ERR(ptr)) 6585 err = PTR_ERR(ptr); 6586 else 6587 memmove(file->pathname, ptr, 6588 sizeof(file->pathname)-(ptr-file->pathname)); 6589 } 6590 spin_unlock(&mddev->lock); 6591 6592 if (err == 0 && 6593 copy_to_user(arg, file, sizeof(*file))) 6594 err = -EFAULT; 6595 6596 kfree(file); 6597 return err; 6598 } 6599 6600 static int get_disk_info(struct mddev *mddev, void __user * arg) 6601 { 6602 mdu_disk_info_t info; 6603 struct md_rdev *rdev; 6604 6605 if (copy_from_user(&info, arg, sizeof(info))) 6606 return -EFAULT; 6607 6608 rcu_read_lock(); 6609 rdev = md_find_rdev_nr_rcu(mddev, info.number); 6610 if (rdev) { 6611 info.major = MAJOR(rdev->bdev->bd_dev); 6612 info.minor = MINOR(rdev->bdev->bd_dev); 6613 info.raid_disk = rdev->raid_disk; 6614 info.state = 0; 6615 if (test_bit(Faulty, &rdev->flags)) 6616 info.state |= (1<<MD_DISK_FAULTY); 6617 else if (test_bit(In_sync, &rdev->flags)) { 6618 info.state |= (1<<MD_DISK_ACTIVE); 6619 info.state |= (1<<MD_DISK_SYNC); 6620 } 6621 if (test_bit(Journal, &rdev->flags)) 6622 info.state |= (1<<MD_DISK_JOURNAL); 6623 if (test_bit(WriteMostly, &rdev->flags)) 6624 info.state |= (1<<MD_DISK_WRITEMOSTLY); 6625 if (test_bit(FailFast, &rdev->flags)) 6626 info.state |= (1<<MD_DISK_FAILFAST); 6627 } else { 6628 info.major = info.minor = 0; 6629 info.raid_disk = -1; 6630 info.state = (1<<MD_DISK_REMOVED); 6631 } 6632 rcu_read_unlock(); 6633 6634 if (copy_to_user(arg, &info, sizeof(info))) 6635 return -EFAULT; 6636 6637 return 0; 6638 } 6639 6640 static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) 6641 { 6642 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 6643 struct md_rdev *rdev; 6644 dev_t dev = MKDEV(info->major,info->minor); 6645 6646 if (mddev_is_clustered(mddev) && 6647 !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { 6648 pr_warn("%s: Cannot add to clustered mddev.\n", 6649 mdname(mddev)); 6650 return -EINVAL; 6651 } 6652 6653 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 6654 return -EOVERFLOW; 6655 6656 if (!mddev->raid_disks) { 6657 int err; 6658 /* expecting a device which has a superblock */ 6659 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 6660 if (IS_ERR(rdev)) { 6661 pr_warn("md: md_import_device returned %ld\n", 6662 PTR_ERR(rdev)); 6663 return PTR_ERR(rdev); 6664 } 6665 if (!list_empty(&mddev->disks)) { 6666 struct md_rdev *rdev0 6667 = list_entry(mddev->disks.next, 6668 struct md_rdev, same_set); 6669 err = super_types[mddev->major_version] 6670 .load_super(rdev, rdev0, mddev->minor_version); 6671 if (err < 0) { 6672 pr_warn("md: %s has different UUID to %s\n", 6673 bdevname(rdev->bdev,b), 6674 bdevname(rdev0->bdev,b2)); 6675 export_rdev(rdev); 6676 return -EINVAL; 6677 } 6678 } 6679 err = bind_rdev_to_array(rdev, mddev); 6680 if (err) 6681 export_rdev(rdev); 6682 return err; 6683 } 6684 6685 /* 6686 * add_new_disk can be used once the array is assembled 6687 * to add "hot spares". They must already have a superblock 6688 * written 6689 */ 6690 if (mddev->pers) { 6691 int err; 6692 if (!mddev->pers->hot_add_disk) { 6693 pr_warn("%s: personality does not support diskops!\n", 6694 mdname(mddev)); 6695 return -EINVAL; 6696 } 6697 if (mddev->persistent) 6698 rdev = md_import_device(dev, mddev->major_version, 6699 mddev->minor_version); 6700 else 6701 rdev = md_import_device(dev, -1, -1); 6702 if (IS_ERR(rdev)) { 6703 pr_warn("md: md_import_device returned %ld\n", 6704 PTR_ERR(rdev)); 6705 return PTR_ERR(rdev); 6706 } 6707 /* set saved_raid_disk if appropriate */ 6708 if (!mddev->persistent) { 6709 if (info->state & (1<<MD_DISK_SYNC) && 6710 info->raid_disk < mddev->raid_disks) { 6711 rdev->raid_disk = info->raid_disk; 6712 set_bit(In_sync, &rdev->flags); 6713 clear_bit(Bitmap_sync, &rdev->flags); 6714 } else 6715 rdev->raid_disk = -1; 6716 rdev->saved_raid_disk = rdev->raid_disk; 6717 } else 6718 super_types[mddev->major_version]. 6719 validate_super(mddev, rdev); 6720 if ((info->state & (1<<MD_DISK_SYNC)) && 6721 rdev->raid_disk != info->raid_disk) { 6722 /* This was a hot-add request, but events doesn't 6723 * match, so reject it. 6724 */ 6725 export_rdev(rdev); 6726 return -EINVAL; 6727 } 6728 6729 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 6730 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 6731 set_bit(WriteMostly, &rdev->flags); 6732 else 6733 clear_bit(WriteMostly, &rdev->flags); 6734 if (info->state & (1<<MD_DISK_FAILFAST)) 6735 set_bit(FailFast, &rdev->flags); 6736 else 6737 clear_bit(FailFast, &rdev->flags); 6738 6739 if (info->state & (1<<MD_DISK_JOURNAL)) { 6740 struct md_rdev *rdev2; 6741 bool has_journal = false; 6742 6743 /* make sure no existing journal disk */ 6744 rdev_for_each(rdev2, mddev) { 6745 if (test_bit(Journal, &rdev2->flags)) { 6746 has_journal = true; 6747 break; 6748 } 6749 } 6750 if (has_journal || mddev->bitmap) { 6751 export_rdev(rdev); 6752 return -EBUSY; 6753 } 6754 set_bit(Journal, &rdev->flags); 6755 } 6756 /* 6757 * check whether the device shows up in other nodes 6758 */ 6759 if (mddev_is_clustered(mddev)) { 6760 if (info->state & (1 << MD_DISK_CANDIDATE)) 6761 set_bit(Candidate, &rdev->flags); 6762 else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { 6763 /* --add initiated by this node */ 6764 err = md_cluster_ops->add_new_disk(mddev, rdev); 6765 if (err) { 6766 export_rdev(rdev); 6767 return err; 6768 } 6769 } 6770 } 6771 6772 rdev->raid_disk = -1; 6773 err = bind_rdev_to_array(rdev, mddev); 6774 6775 if (err) 6776 export_rdev(rdev); 6777 6778 if (mddev_is_clustered(mddev)) { 6779 if (info->state & (1 << MD_DISK_CANDIDATE)) { 6780 if (!err) { 6781 err = md_cluster_ops->new_disk_ack(mddev, 6782 err == 0); 6783 if (err) 6784 md_kick_rdev_from_array(rdev); 6785 } 6786 } else { 6787 if (err) 6788 md_cluster_ops->add_new_disk_cancel(mddev); 6789 else 6790 err = add_bound_rdev(rdev); 6791 } 6792 6793 } else if (!err) 6794 err = add_bound_rdev(rdev); 6795 6796 return err; 6797 } 6798 6799 /* otherwise, add_new_disk is only allowed 6800 * for major_version==0 superblocks 6801 */ 6802 if (mddev->major_version != 0) { 6803 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev)); 6804 return -EINVAL; 6805 } 6806 6807 if (!(info->state & (1<<MD_DISK_FAULTY))) { 6808 int err; 6809 rdev = md_import_device(dev, -1, 0); 6810 if (IS_ERR(rdev)) { 6811 pr_warn("md: error, md_import_device() returned %ld\n", 6812 PTR_ERR(rdev)); 6813 return PTR_ERR(rdev); 6814 } 6815 rdev->desc_nr = info->number; 6816 if (info->raid_disk < mddev->raid_disks) 6817 rdev->raid_disk = info->raid_disk; 6818 else 6819 rdev->raid_disk = -1; 6820 6821 if (rdev->raid_disk < mddev->raid_disks) 6822 if (info->state & (1<<MD_DISK_SYNC)) 6823 set_bit(In_sync, &rdev->flags); 6824 6825 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 6826 set_bit(WriteMostly, &rdev->flags); 6827 if (info->state & (1<<MD_DISK_FAILFAST)) 6828 set_bit(FailFast, &rdev->flags); 6829 6830 if (!mddev->persistent) { 6831 pr_debug("md: nonpersistent superblock ...\n"); 6832 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 6833 } else 6834 rdev->sb_start = calc_dev_sboffset(rdev); 6835 rdev->sectors = rdev->sb_start; 6836 6837 err = bind_rdev_to_array(rdev, mddev); 6838 if (err) { 6839 export_rdev(rdev); 6840 return err; 6841 } 6842 } 6843 6844 return 0; 6845 } 6846 6847 static int hot_remove_disk(struct mddev *mddev, dev_t dev) 6848 { 6849 char b[BDEVNAME_SIZE]; 6850 struct md_rdev *rdev; 6851 6852 if (!mddev->pers) 6853 return -ENODEV; 6854 6855 rdev = find_rdev(mddev, dev); 6856 if (!rdev) 6857 return -ENXIO; 6858 6859 if (rdev->raid_disk < 0) 6860 goto kick_rdev; 6861 6862 clear_bit(Blocked, &rdev->flags); 6863 remove_and_add_spares(mddev, rdev); 6864 6865 if (rdev->raid_disk >= 0) 6866 goto busy; 6867 6868 kick_rdev: 6869 if (mddev_is_clustered(mddev)) 6870 md_cluster_ops->remove_disk(mddev, rdev); 6871 6872 md_kick_rdev_from_array(rdev); 6873 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 6874 if (mddev->thread) 6875 md_wakeup_thread(mddev->thread); 6876 else 6877 md_update_sb(mddev, 1); 6878 md_new_event(mddev); 6879 6880 return 0; 6881 busy: 6882 pr_debug("md: cannot remove active disk %s from %s ...\n", 6883 bdevname(rdev->bdev,b), mdname(mddev)); 6884 return -EBUSY; 6885 } 6886 6887 static int hot_add_disk(struct mddev *mddev, dev_t dev) 6888 { 6889 char b[BDEVNAME_SIZE]; 6890 int err; 6891 struct md_rdev *rdev; 6892 6893 if (!mddev->pers) 6894 return -ENODEV; 6895 6896 if (mddev->major_version != 0) { 6897 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n", 6898 mdname(mddev)); 6899 return -EINVAL; 6900 } 6901 if (!mddev->pers->hot_add_disk) { 6902 pr_warn("%s: personality does not support diskops!\n", 6903 mdname(mddev)); 6904 return -EINVAL; 6905 } 6906 6907 rdev = md_import_device(dev, -1, 0); 6908 if (IS_ERR(rdev)) { 6909 pr_warn("md: error, md_import_device() returned %ld\n", 6910 PTR_ERR(rdev)); 6911 return -EINVAL; 6912 } 6913 6914 if (mddev->persistent) 6915 rdev->sb_start = calc_dev_sboffset(rdev); 6916 else 6917 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 6918 6919 rdev->sectors = rdev->sb_start; 6920 6921 if (test_bit(Faulty, &rdev->flags)) { 6922 pr_warn("md: can not hot-add faulty %s disk to %s!\n", 6923 bdevname(rdev->bdev,b), mdname(mddev)); 6924 err = -EINVAL; 6925 goto abort_export; 6926 } 6927 6928 clear_bit(In_sync, &rdev->flags); 6929 rdev->desc_nr = -1; 6930 rdev->saved_raid_disk = -1; 6931 err = bind_rdev_to_array(rdev, mddev); 6932 if (err) 6933 goto abort_export; 6934 6935 /* 6936 * The rest should better be atomic, we can have disk failures 6937 * noticed in interrupt contexts ... 6938 */ 6939 6940 rdev->raid_disk = -1; 6941 6942 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 6943 if (!mddev->thread) 6944 md_update_sb(mddev, 1); 6945 /* 6946 * Kick recovery, maybe this spare has to be added to the 6947 * array immediately. 6948 */ 6949 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6950 md_wakeup_thread(mddev->thread); 6951 md_new_event(mddev); 6952 return 0; 6953 6954 abort_export: 6955 export_rdev(rdev); 6956 return err; 6957 } 6958 6959 static int set_bitmap_file(struct mddev *mddev, int fd) 6960 { 6961 int err = 0; 6962 6963 if (mddev->pers) { 6964 if (!mddev->pers->quiesce || !mddev->thread) 6965 return -EBUSY; 6966 if (mddev->recovery || mddev->sync_thread) 6967 return -EBUSY; 6968 /* we should be able to change the bitmap.. */ 6969 } 6970 6971 if (fd >= 0) { 6972 struct inode *inode; 6973 struct file *f; 6974 6975 if (mddev->bitmap || mddev->bitmap_info.file) 6976 return -EEXIST; /* cannot add when bitmap is present */ 6977 f = fget(fd); 6978 6979 if (f == NULL) { 6980 pr_warn("%s: error: failed to get bitmap file\n", 6981 mdname(mddev)); 6982 return -EBADF; 6983 } 6984 6985 inode = f->f_mapping->host; 6986 if (!S_ISREG(inode->i_mode)) { 6987 pr_warn("%s: error: bitmap file must be a regular file\n", 6988 mdname(mddev)); 6989 err = -EBADF; 6990 } else if (!(f->f_mode & FMODE_WRITE)) { 6991 pr_warn("%s: error: bitmap file must open for write\n", 6992 mdname(mddev)); 6993 err = -EBADF; 6994 } else if (atomic_read(&inode->i_writecount) != 1) { 6995 pr_warn("%s: error: bitmap file is already in use\n", 6996 mdname(mddev)); 6997 err = -EBUSY; 6998 } 6999 if (err) { 7000 fput(f); 7001 return err; 7002 } 7003 mddev->bitmap_info.file = f; 7004 mddev->bitmap_info.offset = 0; /* file overrides offset */ 7005 } else if (mddev->bitmap == NULL) 7006 return -ENOENT; /* cannot remove what isn't there */ 7007 err = 0; 7008 if (mddev->pers) { 7009 if (fd >= 0) { 7010 struct bitmap *bitmap; 7011 7012 bitmap = md_bitmap_create(mddev, -1); 7013 mddev_suspend(mddev); 7014 if (!IS_ERR(bitmap)) { 7015 mddev->bitmap = bitmap; 7016 err = md_bitmap_load(mddev); 7017 } else 7018 err = PTR_ERR(bitmap); 7019 if (err) { 7020 md_bitmap_destroy(mddev); 7021 fd = -1; 7022 } 7023 mddev_resume(mddev); 7024 } else if (fd < 0) { 7025 mddev_suspend(mddev); 7026 md_bitmap_destroy(mddev); 7027 mddev_resume(mddev); 7028 } 7029 } 7030 if (fd < 0) { 7031 struct file *f = mddev->bitmap_info.file; 7032 if (f) { 7033 spin_lock(&mddev->lock); 7034 mddev->bitmap_info.file = NULL; 7035 spin_unlock(&mddev->lock); 7036 fput(f); 7037 } 7038 } 7039 7040 return err; 7041 } 7042 7043 /* 7044 * set_array_info is used two different ways 7045 * The original usage is when creating a new array. 7046 * In this usage, raid_disks is > 0 and it together with 7047 * level, size, not_persistent,layout,chunksize determine the 7048 * shape of the array. 7049 * This will always create an array with a type-0.90.0 superblock. 7050 * The newer usage is when assembling an array. 7051 * In this case raid_disks will be 0, and the major_version field is 7052 * use to determine which style super-blocks are to be found on the devices. 7053 * The minor and patch _version numbers are also kept incase the 7054 * super_block handler wishes to interpret them. 7055 */ 7056 static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) 7057 { 7058 7059 if (info->raid_disks == 0) { 7060 /* just setting version number for superblock loading */ 7061 if (info->major_version < 0 || 7062 info->major_version >= ARRAY_SIZE(super_types) || 7063 super_types[info->major_version].name == NULL) { 7064 /* maybe try to auto-load a module? */ 7065 pr_warn("md: superblock version %d not known\n", 7066 info->major_version); 7067 return -EINVAL; 7068 } 7069 mddev->major_version = info->major_version; 7070 mddev->minor_version = info->minor_version; 7071 mddev->patch_version = info->patch_version; 7072 mddev->persistent = !info->not_persistent; 7073 /* ensure mddev_put doesn't delete this now that there 7074 * is some minimal configuration. 7075 */ 7076 mddev->ctime = ktime_get_real_seconds(); 7077 return 0; 7078 } 7079 mddev->major_version = MD_MAJOR_VERSION; 7080 mddev->minor_version = MD_MINOR_VERSION; 7081 mddev->patch_version = MD_PATCHLEVEL_VERSION; 7082 mddev->ctime = ktime_get_real_seconds(); 7083 7084 mddev->level = info->level; 7085 mddev->clevel[0] = 0; 7086 mddev->dev_sectors = 2 * (sector_t)info->size; 7087 mddev->raid_disks = info->raid_disks; 7088 /* don't set md_minor, it is determined by which /dev/md* was 7089 * openned 7090 */ 7091 if (info->state & (1<<MD_SB_CLEAN)) 7092 mddev->recovery_cp = MaxSector; 7093 else 7094 mddev->recovery_cp = 0; 7095 mddev->persistent = ! info->not_persistent; 7096 mddev->external = 0; 7097 7098 mddev->layout = info->layout; 7099 if (mddev->level == 0) 7100 /* Cannot trust RAID0 layout info here */ 7101 mddev->layout = -1; 7102 mddev->chunk_sectors = info->chunk_size >> 9; 7103 7104 if (mddev->persistent) { 7105 mddev->max_disks = MD_SB_DISKS; 7106 mddev->flags = 0; 7107 mddev->sb_flags = 0; 7108 } 7109 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 7110 7111 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 7112 mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); 7113 mddev->bitmap_info.offset = 0; 7114 7115 mddev->reshape_position = MaxSector; 7116 7117 /* 7118 * Generate a 128 bit UUID 7119 */ 7120 get_random_bytes(mddev->uuid, 16); 7121 7122 mddev->new_level = mddev->level; 7123 mddev->new_chunk_sectors = mddev->chunk_sectors; 7124 mddev->new_layout = mddev->layout; 7125 mddev->delta_disks = 0; 7126 mddev->reshape_backwards = 0; 7127 7128 return 0; 7129 } 7130 7131 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) 7132 { 7133 lockdep_assert_held(&mddev->reconfig_mutex); 7134 7135 if (mddev->external_size) 7136 return; 7137 7138 mddev->array_sectors = array_sectors; 7139 } 7140 EXPORT_SYMBOL(md_set_array_sectors); 7141 7142 static int update_size(struct mddev *mddev, sector_t num_sectors) 7143 { 7144 struct md_rdev *rdev; 7145 int rv; 7146 int fit = (num_sectors == 0); 7147 sector_t old_dev_sectors = mddev->dev_sectors; 7148 7149 if (mddev->pers->resize == NULL) 7150 return -EINVAL; 7151 /* The "num_sectors" is the number of sectors of each device that 7152 * is used. This can only make sense for arrays with redundancy. 7153 * linear and raid0 always use whatever space is available. We can only 7154 * consider changing this number if no resync or reconstruction is 7155 * happening, and if the new size is acceptable. It must fit before the 7156 * sb_start or, if that is <data_offset, it must fit before the size 7157 * of each device. If num_sectors is zero, we find the largest size 7158 * that fits. 7159 */ 7160 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 7161 mddev->sync_thread) 7162 return -EBUSY; 7163 if (mddev->ro) 7164 return -EROFS; 7165 7166 rdev_for_each(rdev, mddev) { 7167 sector_t avail = rdev->sectors; 7168 7169 if (fit && (num_sectors == 0 || num_sectors > avail)) 7170 num_sectors = avail; 7171 if (avail < num_sectors) 7172 return -ENOSPC; 7173 } 7174 rv = mddev->pers->resize(mddev, num_sectors); 7175 if (!rv) { 7176 if (mddev_is_clustered(mddev)) 7177 md_cluster_ops->update_size(mddev, old_dev_sectors); 7178 else if (mddev->queue) { 7179 set_capacity(mddev->gendisk, mddev->array_sectors); 7180 revalidate_disk(mddev->gendisk); 7181 } 7182 } 7183 return rv; 7184 } 7185 7186 static int update_raid_disks(struct mddev *mddev, int raid_disks) 7187 { 7188 int rv; 7189 struct md_rdev *rdev; 7190 /* change the number of raid disks */ 7191 if (mddev->pers->check_reshape == NULL) 7192 return -EINVAL; 7193 if (mddev->ro) 7194 return -EROFS; 7195 if (raid_disks <= 0 || 7196 (mddev->max_disks && raid_disks >= mddev->max_disks)) 7197 return -EINVAL; 7198 if (mddev->sync_thread || 7199 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 7200 mddev->reshape_position != MaxSector) 7201 return -EBUSY; 7202 7203 rdev_for_each(rdev, mddev) { 7204 if (mddev->raid_disks < raid_disks && 7205 rdev->data_offset < rdev->new_data_offset) 7206 return -EINVAL; 7207 if (mddev->raid_disks > raid_disks && 7208 rdev->data_offset > rdev->new_data_offset) 7209 return -EINVAL; 7210 } 7211 7212 mddev->delta_disks = raid_disks - mddev->raid_disks; 7213 if (mddev->delta_disks < 0) 7214 mddev->reshape_backwards = 1; 7215 else if (mddev->delta_disks > 0) 7216 mddev->reshape_backwards = 0; 7217 7218 rv = mddev->pers->check_reshape(mddev); 7219 if (rv < 0) { 7220 mddev->delta_disks = 0; 7221 mddev->reshape_backwards = 0; 7222 } 7223 return rv; 7224 } 7225 7226 /* 7227 * update_array_info is used to change the configuration of an 7228 * on-line array. 7229 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 7230 * fields in the info are checked against the array. 7231 * Any differences that cannot be handled will cause an error. 7232 * Normally, only one change can be managed at a time. 7233 */ 7234 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) 7235 { 7236 int rv = 0; 7237 int cnt = 0; 7238 int state = 0; 7239 7240 /* calculate expected state,ignoring low bits */ 7241 if (mddev->bitmap && mddev->bitmap_info.offset) 7242 state |= (1 << MD_SB_BITMAP_PRESENT); 7243 7244 if (mddev->major_version != info->major_version || 7245 mddev->minor_version != info->minor_version || 7246 /* mddev->patch_version != info->patch_version || */ 7247 mddev->ctime != info->ctime || 7248 mddev->level != info->level || 7249 /* mddev->layout != info->layout || */ 7250 mddev->persistent != !info->not_persistent || 7251 mddev->chunk_sectors != info->chunk_size >> 9 || 7252 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 7253 ((state^info->state) & 0xfffffe00) 7254 ) 7255 return -EINVAL; 7256 /* Check there is only one change */ 7257 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 7258 cnt++; 7259 if (mddev->raid_disks != info->raid_disks) 7260 cnt++; 7261 if (mddev->layout != info->layout) 7262 cnt++; 7263 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) 7264 cnt++; 7265 if (cnt == 0) 7266 return 0; 7267 if (cnt > 1) 7268 return -EINVAL; 7269 7270 if (mddev->layout != info->layout) { 7271 /* Change layout 7272 * we don't need to do anything at the md level, the 7273 * personality will take care of it all. 7274 */ 7275 if (mddev->pers->check_reshape == NULL) 7276 return -EINVAL; 7277 else { 7278 mddev->new_layout = info->layout; 7279 rv = mddev->pers->check_reshape(mddev); 7280 if (rv) 7281 mddev->new_layout = mddev->layout; 7282 return rv; 7283 } 7284 } 7285 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 7286 rv = update_size(mddev, (sector_t)info->size * 2); 7287 7288 if (mddev->raid_disks != info->raid_disks) 7289 rv = update_raid_disks(mddev, info->raid_disks); 7290 7291 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 7292 if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { 7293 rv = -EINVAL; 7294 goto err; 7295 } 7296 if (mddev->recovery || mddev->sync_thread) { 7297 rv = -EBUSY; 7298 goto err; 7299 } 7300 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 7301 struct bitmap *bitmap; 7302 /* add the bitmap */ 7303 if (mddev->bitmap) { 7304 rv = -EEXIST; 7305 goto err; 7306 } 7307 if (mddev->bitmap_info.default_offset == 0) { 7308 rv = -EINVAL; 7309 goto err; 7310 } 7311 mddev->bitmap_info.offset = 7312 mddev->bitmap_info.default_offset; 7313 mddev->bitmap_info.space = 7314 mddev->bitmap_info.default_space; 7315 bitmap = md_bitmap_create(mddev, -1); 7316 mddev_suspend(mddev); 7317 if (!IS_ERR(bitmap)) { 7318 mddev->bitmap = bitmap; 7319 rv = md_bitmap_load(mddev); 7320 } else 7321 rv = PTR_ERR(bitmap); 7322 if (rv) 7323 md_bitmap_destroy(mddev); 7324 mddev_resume(mddev); 7325 } else { 7326 /* remove the bitmap */ 7327 if (!mddev->bitmap) { 7328 rv = -ENOENT; 7329 goto err; 7330 } 7331 if (mddev->bitmap->storage.file) { 7332 rv = -EINVAL; 7333 goto err; 7334 } 7335 if (mddev->bitmap_info.nodes) { 7336 /* hold PW on all the bitmap lock */ 7337 if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { 7338 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n"); 7339 rv = -EPERM; 7340 md_cluster_ops->unlock_all_bitmaps(mddev); 7341 goto err; 7342 } 7343 7344 mddev->bitmap_info.nodes = 0; 7345 md_cluster_ops->leave(mddev); 7346 } 7347 mddev_suspend(mddev); 7348 md_bitmap_destroy(mddev); 7349 mddev_resume(mddev); 7350 mddev->bitmap_info.offset = 0; 7351 } 7352 } 7353 md_update_sb(mddev, 1); 7354 return rv; 7355 err: 7356 return rv; 7357 } 7358 7359 static int set_disk_faulty(struct mddev *mddev, dev_t dev) 7360 { 7361 struct md_rdev *rdev; 7362 int err = 0; 7363 7364 if (mddev->pers == NULL) 7365 return -ENODEV; 7366 7367 rcu_read_lock(); 7368 rdev = md_find_rdev_rcu(mddev, dev); 7369 if (!rdev) 7370 err = -ENODEV; 7371 else { 7372 md_error(mddev, rdev); 7373 if (!test_bit(Faulty, &rdev->flags)) 7374 err = -EBUSY; 7375 } 7376 rcu_read_unlock(); 7377 return err; 7378 } 7379 7380 /* 7381 * We have a problem here : there is no easy way to give a CHS 7382 * virtual geometry. We currently pretend that we have a 2 heads 7383 * 4 sectors (with a BIG number of cylinders...). This drives 7384 * dosfs just mad... ;-) 7385 */ 7386 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) 7387 { 7388 struct mddev *mddev = bdev->bd_disk->private_data; 7389 7390 geo->heads = 2; 7391 geo->sectors = 4; 7392 geo->cylinders = mddev->array_sectors / 8; 7393 return 0; 7394 } 7395 7396 static inline bool md_ioctl_valid(unsigned int cmd) 7397 { 7398 switch (cmd) { 7399 case ADD_NEW_DISK: 7400 case BLKROSET: 7401 case GET_ARRAY_INFO: 7402 case GET_BITMAP_FILE: 7403 case GET_DISK_INFO: 7404 case HOT_ADD_DISK: 7405 case HOT_REMOVE_DISK: 7406 case RAID_AUTORUN: 7407 case RAID_VERSION: 7408 case RESTART_ARRAY_RW: 7409 case RUN_ARRAY: 7410 case SET_ARRAY_INFO: 7411 case SET_BITMAP_FILE: 7412 case SET_DISK_FAULTY: 7413 case STOP_ARRAY: 7414 case STOP_ARRAY_RO: 7415 case CLUSTERED_DISK_NACK: 7416 return true; 7417 default: 7418 return false; 7419 } 7420 } 7421 7422 static int md_ioctl(struct block_device *bdev, fmode_t mode, 7423 unsigned int cmd, unsigned long arg) 7424 { 7425 int err = 0; 7426 void __user *argp = (void __user *)arg; 7427 struct mddev *mddev = NULL; 7428 int ro; 7429 bool did_set_md_closing = false; 7430 7431 if (!md_ioctl_valid(cmd)) 7432 return -ENOTTY; 7433 7434 switch (cmd) { 7435 case RAID_VERSION: 7436 case GET_ARRAY_INFO: 7437 case GET_DISK_INFO: 7438 break; 7439 default: 7440 if (!capable(CAP_SYS_ADMIN)) 7441 return -EACCES; 7442 } 7443 7444 /* 7445 * Commands dealing with the RAID driver but not any 7446 * particular array: 7447 */ 7448 switch (cmd) { 7449 case RAID_VERSION: 7450 err = get_version(argp); 7451 goto out; 7452 7453 #ifndef MODULE 7454 case RAID_AUTORUN: 7455 err = 0; 7456 autostart_arrays(arg); 7457 goto out; 7458 #endif 7459 default:; 7460 } 7461 7462 /* 7463 * Commands creating/starting a new array: 7464 */ 7465 7466 mddev = bdev->bd_disk->private_data; 7467 7468 if (!mddev) { 7469 BUG(); 7470 goto out; 7471 } 7472 7473 /* Some actions do not requires the mutex */ 7474 switch (cmd) { 7475 case GET_ARRAY_INFO: 7476 if (!mddev->raid_disks && !mddev->external) 7477 err = -ENODEV; 7478 else 7479 err = get_array_info(mddev, argp); 7480 goto out; 7481 7482 case GET_DISK_INFO: 7483 if (!mddev->raid_disks && !mddev->external) 7484 err = -ENODEV; 7485 else 7486 err = get_disk_info(mddev, argp); 7487 goto out; 7488 7489 case SET_DISK_FAULTY: 7490 err = set_disk_faulty(mddev, new_decode_dev(arg)); 7491 goto out; 7492 7493 case GET_BITMAP_FILE: 7494 err = get_bitmap_file(mddev, argp); 7495 goto out; 7496 7497 } 7498 7499 if (cmd == ADD_NEW_DISK) 7500 /* need to ensure md_delayed_delete() has completed */ 7501 flush_workqueue(md_misc_wq); 7502 7503 if (cmd == HOT_REMOVE_DISK) 7504 /* need to ensure recovery thread has run */ 7505 wait_event_interruptible_timeout(mddev->sb_wait, 7506 !test_bit(MD_RECOVERY_NEEDED, 7507 &mddev->recovery), 7508 msecs_to_jiffies(5000)); 7509 if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { 7510 /* Need to flush page cache, and ensure no-one else opens 7511 * and writes 7512 */ 7513 mutex_lock(&mddev->open_mutex); 7514 if (mddev->pers && atomic_read(&mddev->openers) > 1) { 7515 mutex_unlock(&mddev->open_mutex); 7516 err = -EBUSY; 7517 goto out; 7518 } 7519 WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags)); 7520 set_bit(MD_CLOSING, &mddev->flags); 7521 did_set_md_closing = true; 7522 mutex_unlock(&mddev->open_mutex); 7523 sync_blockdev(bdev); 7524 } 7525 err = mddev_lock(mddev); 7526 if (err) { 7527 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n", 7528 err, cmd); 7529 goto out; 7530 } 7531 7532 if (cmd == SET_ARRAY_INFO) { 7533 mdu_array_info_t info; 7534 if (!arg) 7535 memset(&info, 0, sizeof(info)); 7536 else if (copy_from_user(&info, argp, sizeof(info))) { 7537 err = -EFAULT; 7538 goto unlock; 7539 } 7540 if (mddev->pers) { 7541 err = update_array_info(mddev, &info); 7542 if (err) { 7543 pr_warn("md: couldn't update array info. %d\n", err); 7544 goto unlock; 7545 } 7546 goto unlock; 7547 } 7548 if (!list_empty(&mddev->disks)) { 7549 pr_warn("md: array %s already has disks!\n", mdname(mddev)); 7550 err = -EBUSY; 7551 goto unlock; 7552 } 7553 if (mddev->raid_disks) { 7554 pr_warn("md: array %s already initialised!\n", mdname(mddev)); 7555 err = -EBUSY; 7556 goto unlock; 7557 } 7558 err = set_array_info(mddev, &info); 7559 if (err) { 7560 pr_warn("md: couldn't set array info. %d\n", err); 7561 goto unlock; 7562 } 7563 goto unlock; 7564 } 7565 7566 /* 7567 * Commands querying/configuring an existing array: 7568 */ 7569 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 7570 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ 7571 if ((!mddev->raid_disks && !mddev->external) 7572 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 7573 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE 7574 && cmd != GET_BITMAP_FILE) { 7575 err = -ENODEV; 7576 goto unlock; 7577 } 7578 7579 /* 7580 * Commands even a read-only array can execute: 7581 */ 7582 switch (cmd) { 7583 case RESTART_ARRAY_RW: 7584 err = restart_array(mddev); 7585 goto unlock; 7586 7587 case STOP_ARRAY: 7588 err = do_md_stop(mddev, 0, bdev); 7589 goto unlock; 7590 7591 case STOP_ARRAY_RO: 7592 err = md_set_readonly(mddev, bdev); 7593 goto unlock; 7594 7595 case HOT_REMOVE_DISK: 7596 err = hot_remove_disk(mddev, new_decode_dev(arg)); 7597 goto unlock; 7598 7599 case ADD_NEW_DISK: 7600 /* We can support ADD_NEW_DISK on read-only arrays 7601 * only if we are re-adding a preexisting device. 7602 * So require mddev->pers and MD_DISK_SYNC. 7603 */ 7604 if (mddev->pers) { 7605 mdu_disk_info_t info; 7606 if (copy_from_user(&info, argp, sizeof(info))) 7607 err = -EFAULT; 7608 else if (!(info.state & (1<<MD_DISK_SYNC))) 7609 /* Need to clear read-only for this */ 7610 break; 7611 else 7612 err = add_new_disk(mddev, &info); 7613 goto unlock; 7614 } 7615 break; 7616 7617 case BLKROSET: 7618 if (get_user(ro, (int __user *)(arg))) { 7619 err = -EFAULT; 7620 goto unlock; 7621 } 7622 err = -EINVAL; 7623 7624 /* if the bdev is going readonly the value of mddev->ro 7625 * does not matter, no writes are coming 7626 */ 7627 if (ro) 7628 goto unlock; 7629 7630 /* are we are already prepared for writes? */ 7631 if (mddev->ro != 1) 7632 goto unlock; 7633 7634 /* transitioning to readauto need only happen for 7635 * arrays that call md_write_start 7636 */ 7637 if (mddev->pers) { 7638 err = restart_array(mddev); 7639 if (err == 0) { 7640 mddev->ro = 2; 7641 set_disk_ro(mddev->gendisk, 0); 7642 } 7643 } 7644 goto unlock; 7645 } 7646 7647 /* 7648 * The remaining ioctls are changing the state of the 7649 * superblock, so we do not allow them on read-only arrays. 7650 */ 7651 if (mddev->ro && mddev->pers) { 7652 if (mddev->ro == 2) { 7653 mddev->ro = 0; 7654 sysfs_notify_dirent_safe(mddev->sysfs_state); 7655 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7656 /* mddev_unlock will wake thread */ 7657 /* If a device failed while we were read-only, we 7658 * need to make sure the metadata is updated now. 7659 */ 7660 if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) { 7661 mddev_unlock(mddev); 7662 wait_event(mddev->sb_wait, 7663 !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) && 7664 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); 7665 mddev_lock_nointr(mddev); 7666 } 7667 } else { 7668 err = -EROFS; 7669 goto unlock; 7670 } 7671 } 7672 7673 switch (cmd) { 7674 case ADD_NEW_DISK: 7675 { 7676 mdu_disk_info_t info; 7677 if (copy_from_user(&info, argp, sizeof(info))) 7678 err = -EFAULT; 7679 else 7680 err = add_new_disk(mddev, &info); 7681 goto unlock; 7682 } 7683 7684 case CLUSTERED_DISK_NACK: 7685 if (mddev_is_clustered(mddev)) 7686 md_cluster_ops->new_disk_ack(mddev, false); 7687 else 7688 err = -EINVAL; 7689 goto unlock; 7690 7691 case HOT_ADD_DISK: 7692 err = hot_add_disk(mddev, new_decode_dev(arg)); 7693 goto unlock; 7694 7695 case RUN_ARRAY: 7696 err = do_md_run(mddev); 7697 goto unlock; 7698 7699 case SET_BITMAP_FILE: 7700 err = set_bitmap_file(mddev, (int)arg); 7701 goto unlock; 7702 7703 default: 7704 err = -EINVAL; 7705 goto unlock; 7706 } 7707 7708 unlock: 7709 if (mddev->hold_active == UNTIL_IOCTL && 7710 err != -EINVAL) 7711 mddev->hold_active = 0; 7712 mddev_unlock(mddev); 7713 out: 7714 if(did_set_md_closing) 7715 clear_bit(MD_CLOSING, &mddev->flags); 7716 return err; 7717 } 7718 #ifdef CONFIG_COMPAT 7719 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, 7720 unsigned int cmd, unsigned long arg) 7721 { 7722 switch (cmd) { 7723 case HOT_REMOVE_DISK: 7724 case HOT_ADD_DISK: 7725 case SET_DISK_FAULTY: 7726 case SET_BITMAP_FILE: 7727 /* These take in integer arg, do not convert */ 7728 break; 7729 default: 7730 arg = (unsigned long)compat_ptr(arg); 7731 break; 7732 } 7733 7734 return md_ioctl(bdev, mode, cmd, arg); 7735 } 7736 #endif /* CONFIG_COMPAT */ 7737 7738 static int md_open(struct block_device *bdev, fmode_t mode) 7739 { 7740 /* 7741 * Succeed if we can lock the mddev, which confirms that 7742 * it isn't being stopped right now. 7743 */ 7744 struct mddev *mddev = mddev_find(bdev->bd_dev); 7745 int err; 7746 7747 if (!mddev) 7748 return -ENODEV; 7749 7750 if (mddev->gendisk != bdev->bd_disk) { 7751 /* we are racing with mddev_put which is discarding this 7752 * bd_disk. 7753 */ 7754 mddev_put(mddev); 7755 /* Wait until bdev->bd_disk is definitely gone */ 7756 flush_workqueue(md_misc_wq); 7757 /* Then retry the open from the top */ 7758 return -ERESTARTSYS; 7759 } 7760 BUG_ON(mddev != bdev->bd_disk->private_data); 7761 7762 if ((err = mutex_lock_interruptible(&mddev->open_mutex))) 7763 goto out; 7764 7765 if (test_bit(MD_CLOSING, &mddev->flags)) { 7766 mutex_unlock(&mddev->open_mutex); 7767 err = -ENODEV; 7768 goto out; 7769 } 7770 7771 err = 0; 7772 atomic_inc(&mddev->openers); 7773 mutex_unlock(&mddev->open_mutex); 7774 7775 check_disk_change(bdev); 7776 out: 7777 if (err) 7778 mddev_put(mddev); 7779 return err; 7780 } 7781 7782 static void md_release(struct gendisk *disk, fmode_t mode) 7783 { 7784 struct mddev *mddev = disk->private_data; 7785 7786 BUG_ON(!mddev); 7787 atomic_dec(&mddev->openers); 7788 mddev_put(mddev); 7789 } 7790 7791 static int md_media_changed(struct gendisk *disk) 7792 { 7793 struct mddev *mddev = disk->private_data; 7794 7795 return mddev->changed; 7796 } 7797 7798 static int md_revalidate(struct gendisk *disk) 7799 { 7800 struct mddev *mddev = disk->private_data; 7801 7802 mddev->changed = 0; 7803 return 0; 7804 } 7805 static const struct block_device_operations md_fops = 7806 { 7807 .owner = THIS_MODULE, 7808 .open = md_open, 7809 .release = md_release, 7810 .ioctl = md_ioctl, 7811 #ifdef CONFIG_COMPAT 7812 .compat_ioctl = md_compat_ioctl, 7813 #endif 7814 .getgeo = md_getgeo, 7815 .media_changed = md_media_changed, 7816 .revalidate_disk= md_revalidate, 7817 }; 7818 7819 static int md_thread(void *arg) 7820 { 7821 struct md_thread *thread = arg; 7822 7823 /* 7824 * md_thread is a 'system-thread', it's priority should be very 7825 * high. We avoid resource deadlocks individually in each 7826 * raid personality. (RAID5 does preallocation) We also use RR and 7827 * the very same RT priority as kswapd, thus we will never get 7828 * into a priority inversion deadlock. 7829 * 7830 * we definitely have to have equal or higher priority than 7831 * bdflush, otherwise bdflush will deadlock if there are too 7832 * many dirty RAID5 blocks. 7833 */ 7834 7835 allow_signal(SIGKILL); 7836 while (!kthread_should_stop()) { 7837 7838 /* We need to wait INTERRUPTIBLE so that 7839 * we don't add to the load-average. 7840 * That means we need to be sure no signals are 7841 * pending 7842 */ 7843 if (signal_pending(current)) 7844 flush_signals(current); 7845 7846 wait_event_interruptible_timeout 7847 (thread->wqueue, 7848 test_bit(THREAD_WAKEUP, &thread->flags) 7849 || kthread_should_stop() || kthread_should_park(), 7850 thread->timeout); 7851 7852 clear_bit(THREAD_WAKEUP, &thread->flags); 7853 if (kthread_should_park()) 7854 kthread_parkme(); 7855 if (!kthread_should_stop()) 7856 thread->run(thread); 7857 } 7858 7859 return 0; 7860 } 7861 7862 void md_wakeup_thread(struct md_thread *thread) 7863 { 7864 if (thread) { 7865 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); 7866 set_bit(THREAD_WAKEUP, &thread->flags); 7867 wake_up(&thread->wqueue); 7868 } 7869 } 7870 EXPORT_SYMBOL(md_wakeup_thread); 7871 7872 struct md_thread *md_register_thread(void (*run) (struct md_thread *), 7873 struct mddev *mddev, const char *name) 7874 { 7875 struct md_thread *thread; 7876 7877 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); 7878 if (!thread) 7879 return NULL; 7880 7881 init_waitqueue_head(&thread->wqueue); 7882 7883 thread->run = run; 7884 thread->mddev = mddev; 7885 thread->timeout = MAX_SCHEDULE_TIMEOUT; 7886 thread->tsk = kthread_run(md_thread, thread, 7887 "%s_%s", 7888 mdname(thread->mddev), 7889 name); 7890 if (IS_ERR(thread->tsk)) { 7891 kfree(thread); 7892 return NULL; 7893 } 7894 return thread; 7895 } 7896 EXPORT_SYMBOL(md_register_thread); 7897 7898 void md_unregister_thread(struct md_thread **threadp) 7899 { 7900 struct md_thread *thread = *threadp; 7901 if (!thread) 7902 return; 7903 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); 7904 /* Locking ensures that mddev_unlock does not wake_up a 7905 * non-existent thread 7906 */ 7907 spin_lock(&pers_lock); 7908 *threadp = NULL; 7909 spin_unlock(&pers_lock); 7910 7911 kthread_stop(thread->tsk); 7912 kfree(thread); 7913 } 7914 EXPORT_SYMBOL(md_unregister_thread); 7915 7916 void md_error(struct mddev *mddev, struct md_rdev *rdev) 7917 { 7918 if (!rdev || test_bit(Faulty, &rdev->flags)) 7919 return; 7920 7921 if (!mddev->pers || !mddev->pers->error_handler) 7922 return; 7923 mddev->pers->error_handler(mddev,rdev); 7924 if (mddev->degraded) 7925 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7926 sysfs_notify_dirent_safe(rdev->sysfs_state); 7927 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7928 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7929 md_wakeup_thread(mddev->thread); 7930 if (mddev->event_work.func) 7931 queue_work(md_misc_wq, &mddev->event_work); 7932 md_new_event(mddev); 7933 } 7934 EXPORT_SYMBOL(md_error); 7935 7936 /* seq_file implementation /proc/mdstat */ 7937 7938 static void status_unused(struct seq_file *seq) 7939 { 7940 int i = 0; 7941 struct md_rdev *rdev; 7942 7943 seq_printf(seq, "unused devices: "); 7944 7945 list_for_each_entry(rdev, &pending_raid_disks, same_set) { 7946 char b[BDEVNAME_SIZE]; 7947 i++; 7948 seq_printf(seq, "%s ", 7949 bdevname(rdev->bdev,b)); 7950 } 7951 if (!i) 7952 seq_printf(seq, "<none>"); 7953 7954 seq_printf(seq, "\n"); 7955 } 7956 7957 static int status_resync(struct seq_file *seq, struct mddev *mddev) 7958 { 7959 sector_t max_sectors, resync, res; 7960 unsigned long dt, db = 0; 7961 sector_t rt, curr_mark_cnt, resync_mark_cnt; 7962 int scale, recovery_active; 7963 unsigned int per_milli; 7964 7965 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 7966 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7967 max_sectors = mddev->resync_max_sectors; 7968 else 7969 max_sectors = mddev->dev_sectors; 7970 7971 resync = mddev->curr_resync; 7972 if (resync <= 3) { 7973 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 7974 /* Still cleaning up */ 7975 resync = max_sectors; 7976 } else if (resync > max_sectors) 7977 resync = max_sectors; 7978 else 7979 resync -= atomic_read(&mddev->recovery_active); 7980 7981 if (resync == 0) { 7982 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) { 7983 struct md_rdev *rdev; 7984 7985 rdev_for_each(rdev, mddev) 7986 if (rdev->raid_disk >= 0 && 7987 !test_bit(Faulty, &rdev->flags) && 7988 rdev->recovery_offset != MaxSector && 7989 rdev->recovery_offset) { 7990 seq_printf(seq, "\trecover=REMOTE"); 7991 return 1; 7992 } 7993 if (mddev->reshape_position != MaxSector) 7994 seq_printf(seq, "\treshape=REMOTE"); 7995 else 7996 seq_printf(seq, "\tresync=REMOTE"); 7997 return 1; 7998 } 7999 if (mddev->recovery_cp < MaxSector) { 8000 seq_printf(seq, "\tresync=PENDING"); 8001 return 1; 8002 } 8003 return 0; 8004 } 8005 if (resync < 3) { 8006 seq_printf(seq, "\tresync=DELAYED"); 8007 return 1; 8008 } 8009 8010 WARN_ON(max_sectors == 0); 8011 /* Pick 'scale' such that (resync>>scale)*1000 will fit 8012 * in a sector_t, and (max_sectors>>scale) will fit in a 8013 * u32, as those are the requirements for sector_div. 8014 * Thus 'scale' must be at least 10 8015 */ 8016 scale = 10; 8017 if (sizeof(sector_t) > sizeof(unsigned long)) { 8018 while ( max_sectors/2 > (1ULL<<(scale+32))) 8019 scale++; 8020 } 8021 res = (resync>>scale)*1000; 8022 sector_div(res, (u32)((max_sectors>>scale)+1)); 8023 8024 per_milli = res; 8025 { 8026 int i, x = per_milli/50, y = 20-x; 8027 seq_printf(seq, "["); 8028 for (i = 0; i < x; i++) 8029 seq_printf(seq, "="); 8030 seq_printf(seq, ">"); 8031 for (i = 0; i < y; i++) 8032 seq_printf(seq, "."); 8033 seq_printf(seq, "] "); 8034 } 8035 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", 8036 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? 8037 "reshape" : 8038 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? 8039 "check" : 8040 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 8041 "resync" : "recovery"))), 8042 per_milli/10, per_milli % 10, 8043 (unsigned long long) resync/2, 8044 (unsigned long long) max_sectors/2); 8045 8046 /* 8047 * dt: time from mark until now 8048 * db: blocks written from mark until now 8049 * rt: remaining time 8050 * 8051 * rt is a sector_t, which is always 64bit now. We are keeping 8052 * the original algorithm, but it is not really necessary. 8053 * 8054 * Original algorithm: 8055 * So we divide before multiply in case it is 32bit and close 8056 * to the limit. 8057 * We scale the divisor (db) by 32 to avoid losing precision 8058 * near the end of resync when the number of remaining sectors 8059 * is close to 'db'. 8060 * We then divide rt by 32 after multiplying by db to compensate. 8061 * The '+1' avoids division by zero if db is very small. 8062 */ 8063 dt = ((jiffies - mddev->resync_mark) / HZ); 8064 if (!dt) dt++; 8065 8066 curr_mark_cnt = mddev->curr_mark_cnt; 8067 recovery_active = atomic_read(&mddev->recovery_active); 8068 resync_mark_cnt = mddev->resync_mark_cnt; 8069 8070 if (curr_mark_cnt >= (recovery_active + resync_mark_cnt)) 8071 db = curr_mark_cnt - (recovery_active + resync_mark_cnt); 8072 8073 rt = max_sectors - resync; /* number of remaining sectors */ 8074 rt = div64_u64(rt, db/32+1); 8075 rt *= dt; 8076 rt >>= 5; 8077 8078 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, 8079 ((unsigned long)rt % 60)/6); 8080 8081 seq_printf(seq, " speed=%ldK/sec", db/2/dt); 8082 return 1; 8083 } 8084 8085 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 8086 { 8087 struct list_head *tmp; 8088 loff_t l = *pos; 8089 struct mddev *mddev; 8090 8091 if (l >= 0x10000) 8092 return NULL; 8093 if (!l--) 8094 /* header */ 8095 return (void*)1; 8096 8097 spin_lock(&all_mddevs_lock); 8098 list_for_each(tmp,&all_mddevs) 8099 if (!l--) { 8100 mddev = list_entry(tmp, struct mddev, all_mddevs); 8101 mddev_get(mddev); 8102 spin_unlock(&all_mddevs_lock); 8103 return mddev; 8104 } 8105 spin_unlock(&all_mddevs_lock); 8106 if (!l--) 8107 return (void*)2;/* tail */ 8108 return NULL; 8109 } 8110 8111 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 8112 { 8113 struct list_head *tmp; 8114 struct mddev *next_mddev, *mddev = v; 8115 8116 ++*pos; 8117 if (v == (void*)2) 8118 return NULL; 8119 8120 spin_lock(&all_mddevs_lock); 8121 if (v == (void*)1) 8122 tmp = all_mddevs.next; 8123 else 8124 tmp = mddev->all_mddevs.next; 8125 if (tmp != &all_mddevs) 8126 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); 8127 else { 8128 next_mddev = (void*)2; 8129 *pos = 0x10000; 8130 } 8131 spin_unlock(&all_mddevs_lock); 8132 8133 if (v != (void*)1) 8134 mddev_put(mddev); 8135 return next_mddev; 8136 8137 } 8138 8139 static void md_seq_stop(struct seq_file *seq, void *v) 8140 { 8141 struct mddev *mddev = v; 8142 8143 if (mddev && v != (void*)1 && v != (void*)2) 8144 mddev_put(mddev); 8145 } 8146 8147 static int md_seq_show(struct seq_file *seq, void *v) 8148 { 8149 struct mddev *mddev = v; 8150 sector_t sectors; 8151 struct md_rdev *rdev; 8152 8153 if (v == (void*)1) { 8154 struct md_personality *pers; 8155 seq_printf(seq, "Personalities : "); 8156 spin_lock(&pers_lock); 8157 list_for_each_entry(pers, &pers_list, list) 8158 seq_printf(seq, "[%s] ", pers->name); 8159 8160 spin_unlock(&pers_lock); 8161 seq_printf(seq, "\n"); 8162 seq->poll_event = atomic_read(&md_event_count); 8163 return 0; 8164 } 8165 if (v == (void*)2) { 8166 status_unused(seq); 8167 return 0; 8168 } 8169 8170 spin_lock(&mddev->lock); 8171 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 8172 seq_printf(seq, "%s : %sactive", mdname(mddev), 8173 mddev->pers ? "" : "in"); 8174 if (mddev->pers) { 8175 if (mddev->ro==1) 8176 seq_printf(seq, " (read-only)"); 8177 if (mddev->ro==2) 8178 seq_printf(seq, " (auto-read-only)"); 8179 seq_printf(seq, " %s", mddev->pers->name); 8180 } 8181 8182 sectors = 0; 8183 rcu_read_lock(); 8184 rdev_for_each_rcu(rdev, mddev) { 8185 char b[BDEVNAME_SIZE]; 8186 seq_printf(seq, " %s[%d]", 8187 bdevname(rdev->bdev,b), rdev->desc_nr); 8188 if (test_bit(WriteMostly, &rdev->flags)) 8189 seq_printf(seq, "(W)"); 8190 if (test_bit(Journal, &rdev->flags)) 8191 seq_printf(seq, "(J)"); 8192 if (test_bit(Faulty, &rdev->flags)) { 8193 seq_printf(seq, "(F)"); 8194 continue; 8195 } 8196 if (rdev->raid_disk < 0) 8197 seq_printf(seq, "(S)"); /* spare */ 8198 if (test_bit(Replacement, &rdev->flags)) 8199 seq_printf(seq, "(R)"); 8200 sectors += rdev->sectors; 8201 } 8202 rcu_read_unlock(); 8203 8204 if (!list_empty(&mddev->disks)) { 8205 if (mddev->pers) 8206 seq_printf(seq, "\n %llu blocks", 8207 (unsigned long long) 8208 mddev->array_sectors / 2); 8209 else 8210 seq_printf(seq, "\n %llu blocks", 8211 (unsigned long long)sectors / 2); 8212 } 8213 if (mddev->persistent) { 8214 if (mddev->major_version != 0 || 8215 mddev->minor_version != 90) { 8216 seq_printf(seq," super %d.%d", 8217 mddev->major_version, 8218 mddev->minor_version); 8219 } 8220 } else if (mddev->external) 8221 seq_printf(seq, " super external:%s", 8222 mddev->metadata_type); 8223 else 8224 seq_printf(seq, " super non-persistent"); 8225 8226 if (mddev->pers) { 8227 mddev->pers->status(seq, mddev); 8228 seq_printf(seq, "\n "); 8229 if (mddev->pers->sync_request) { 8230 if (status_resync(seq, mddev)) 8231 seq_printf(seq, "\n "); 8232 } 8233 } else 8234 seq_printf(seq, "\n "); 8235 8236 md_bitmap_status(seq, mddev->bitmap); 8237 8238 seq_printf(seq, "\n"); 8239 } 8240 spin_unlock(&mddev->lock); 8241 8242 return 0; 8243 } 8244 8245 static const struct seq_operations md_seq_ops = { 8246 .start = md_seq_start, 8247 .next = md_seq_next, 8248 .stop = md_seq_stop, 8249 .show = md_seq_show, 8250 }; 8251 8252 static int md_seq_open(struct inode *inode, struct file *file) 8253 { 8254 struct seq_file *seq; 8255 int error; 8256 8257 error = seq_open(file, &md_seq_ops); 8258 if (error) 8259 return error; 8260 8261 seq = file->private_data; 8262 seq->poll_event = atomic_read(&md_event_count); 8263 return error; 8264 } 8265 8266 static int md_unloading; 8267 static __poll_t mdstat_poll(struct file *filp, poll_table *wait) 8268 { 8269 struct seq_file *seq = filp->private_data; 8270 __poll_t mask; 8271 8272 if (md_unloading) 8273 return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI; 8274 poll_wait(filp, &md_event_waiters, wait); 8275 8276 /* always allow read */ 8277 mask = EPOLLIN | EPOLLRDNORM; 8278 8279 if (seq->poll_event != atomic_read(&md_event_count)) 8280 mask |= EPOLLERR | EPOLLPRI; 8281 return mask; 8282 } 8283 8284 static const struct proc_ops mdstat_proc_ops = { 8285 .proc_open = md_seq_open, 8286 .proc_read = seq_read, 8287 .proc_lseek = seq_lseek, 8288 .proc_release = seq_release, 8289 .proc_poll = mdstat_poll, 8290 }; 8291 8292 int register_md_personality(struct md_personality *p) 8293 { 8294 pr_debug("md: %s personality registered for level %d\n", 8295 p->name, p->level); 8296 spin_lock(&pers_lock); 8297 list_add_tail(&p->list, &pers_list); 8298 spin_unlock(&pers_lock); 8299 return 0; 8300 } 8301 EXPORT_SYMBOL(register_md_personality); 8302 8303 int unregister_md_personality(struct md_personality *p) 8304 { 8305 pr_debug("md: %s personality unregistered\n", p->name); 8306 spin_lock(&pers_lock); 8307 list_del_init(&p->list); 8308 spin_unlock(&pers_lock); 8309 return 0; 8310 } 8311 EXPORT_SYMBOL(unregister_md_personality); 8312 8313 int register_md_cluster_operations(struct md_cluster_operations *ops, 8314 struct module *module) 8315 { 8316 int ret = 0; 8317 spin_lock(&pers_lock); 8318 if (md_cluster_ops != NULL) 8319 ret = -EALREADY; 8320 else { 8321 md_cluster_ops = ops; 8322 md_cluster_mod = module; 8323 } 8324 spin_unlock(&pers_lock); 8325 return ret; 8326 } 8327 EXPORT_SYMBOL(register_md_cluster_operations); 8328 8329 int unregister_md_cluster_operations(void) 8330 { 8331 spin_lock(&pers_lock); 8332 md_cluster_ops = NULL; 8333 spin_unlock(&pers_lock); 8334 return 0; 8335 } 8336 EXPORT_SYMBOL(unregister_md_cluster_operations); 8337 8338 int md_setup_cluster(struct mddev *mddev, int nodes) 8339 { 8340 if (!md_cluster_ops) 8341 request_module("md-cluster"); 8342 spin_lock(&pers_lock); 8343 /* ensure module won't be unloaded */ 8344 if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { 8345 pr_warn("can't find md-cluster module or get it's reference.\n"); 8346 spin_unlock(&pers_lock); 8347 return -ENOENT; 8348 } 8349 spin_unlock(&pers_lock); 8350 8351 return md_cluster_ops->join(mddev, nodes); 8352 } 8353 8354 void md_cluster_stop(struct mddev *mddev) 8355 { 8356 if (!md_cluster_ops) 8357 return; 8358 md_cluster_ops->leave(mddev); 8359 module_put(md_cluster_mod); 8360 } 8361 8362 static int is_mddev_idle(struct mddev *mddev, int init) 8363 { 8364 struct md_rdev *rdev; 8365 int idle; 8366 int curr_events; 8367 8368 idle = 1; 8369 rcu_read_lock(); 8370 rdev_for_each_rcu(rdev, mddev) { 8371 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 8372 curr_events = (int)part_stat_read_accum(&disk->part0, sectors) - 8373 atomic_read(&disk->sync_io); 8374 /* sync IO will cause sync_io to increase before the disk_stats 8375 * as sync_io is counted when a request starts, and 8376 * disk_stats is counted when it completes. 8377 * So resync activity will cause curr_events to be smaller than 8378 * when there was no such activity. 8379 * non-sync IO will cause disk_stat to increase without 8380 * increasing sync_io so curr_events will (eventually) 8381 * be larger than it was before. Once it becomes 8382 * substantially larger, the test below will cause 8383 * the array to appear non-idle, and resync will slow 8384 * down. 8385 * If there is a lot of outstanding resync activity when 8386 * we set last_event to curr_events, then all that activity 8387 * completing might cause the array to appear non-idle 8388 * and resync will be slowed down even though there might 8389 * not have been non-resync activity. This will only 8390 * happen once though. 'last_events' will soon reflect 8391 * the state where there is little or no outstanding 8392 * resync requests, and further resync activity will 8393 * always make curr_events less than last_events. 8394 * 8395 */ 8396 if (init || curr_events - rdev->last_events > 64) { 8397 rdev->last_events = curr_events; 8398 idle = 0; 8399 } 8400 } 8401 rcu_read_unlock(); 8402 return idle; 8403 } 8404 8405 void md_done_sync(struct mddev *mddev, int blocks, int ok) 8406 { 8407 /* another "blocks" (512byte) blocks have been synced */ 8408 atomic_sub(blocks, &mddev->recovery_active); 8409 wake_up(&mddev->recovery_wait); 8410 if (!ok) { 8411 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 8412 set_bit(MD_RECOVERY_ERROR, &mddev->recovery); 8413 md_wakeup_thread(mddev->thread); 8414 // stop recovery, signal do_sync .... 8415 } 8416 } 8417 EXPORT_SYMBOL(md_done_sync); 8418 8419 /* md_write_start(mddev, bi) 8420 * If we need to update some array metadata (e.g. 'active' flag 8421 * in superblock) before writing, schedule a superblock update 8422 * and wait for it to complete. 8423 * A return value of 'false' means that the write wasn't recorded 8424 * and cannot proceed as the array is being suspend. 8425 */ 8426 bool md_write_start(struct mddev *mddev, struct bio *bi) 8427 { 8428 int did_change = 0; 8429 8430 if (bio_data_dir(bi) != WRITE) 8431 return true; 8432 8433 BUG_ON(mddev->ro == 1); 8434 if (mddev->ro == 2) { 8435 /* need to switch to read/write */ 8436 mddev->ro = 0; 8437 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 8438 md_wakeup_thread(mddev->thread); 8439 md_wakeup_thread(mddev->sync_thread); 8440 did_change = 1; 8441 } 8442 rcu_read_lock(); 8443 percpu_ref_get(&mddev->writes_pending); 8444 smp_mb(); /* Match smp_mb in set_in_sync() */ 8445 if (mddev->safemode == 1) 8446 mddev->safemode = 0; 8447 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */ 8448 if (mddev->in_sync || mddev->sync_checkers) { 8449 spin_lock(&mddev->lock); 8450 if (mddev->in_sync) { 8451 mddev->in_sync = 0; 8452 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 8453 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 8454 md_wakeup_thread(mddev->thread); 8455 did_change = 1; 8456 } 8457 spin_unlock(&mddev->lock); 8458 } 8459 rcu_read_unlock(); 8460 if (did_change) 8461 sysfs_notify_dirent_safe(mddev->sysfs_state); 8462 if (!mddev->has_superblocks) 8463 return true; 8464 wait_event(mddev->sb_wait, 8465 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) || 8466 mddev->suspended); 8467 if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 8468 percpu_ref_put(&mddev->writes_pending); 8469 return false; 8470 } 8471 return true; 8472 } 8473 EXPORT_SYMBOL(md_write_start); 8474 8475 /* md_write_inc can only be called when md_write_start() has 8476 * already been called at least once of the current request. 8477 * It increments the counter and is useful when a single request 8478 * is split into several parts. Each part causes an increment and 8479 * so needs a matching md_write_end(). 8480 * Unlike md_write_start(), it is safe to call md_write_inc() inside 8481 * a spinlocked region. 8482 */ 8483 void md_write_inc(struct mddev *mddev, struct bio *bi) 8484 { 8485 if (bio_data_dir(bi) != WRITE) 8486 return; 8487 WARN_ON_ONCE(mddev->in_sync || mddev->ro); 8488 percpu_ref_get(&mddev->writes_pending); 8489 } 8490 EXPORT_SYMBOL(md_write_inc); 8491 8492 void md_write_end(struct mddev *mddev) 8493 { 8494 percpu_ref_put(&mddev->writes_pending); 8495 8496 if (mddev->safemode == 2) 8497 md_wakeup_thread(mddev->thread); 8498 else if (mddev->safemode_delay) 8499 /* The roundup() ensures this only performs locking once 8500 * every ->safemode_delay jiffies 8501 */ 8502 mod_timer(&mddev->safemode_timer, 8503 roundup(jiffies, mddev->safemode_delay) + 8504 mddev->safemode_delay); 8505 } 8506 8507 EXPORT_SYMBOL(md_write_end); 8508 8509 /* md_allow_write(mddev) 8510 * Calling this ensures that the array is marked 'active' so that writes 8511 * may proceed without blocking. It is important to call this before 8512 * attempting a GFP_KERNEL allocation while holding the mddev lock. 8513 * Must be called with mddev_lock held. 8514 */ 8515 void md_allow_write(struct mddev *mddev) 8516 { 8517 if (!mddev->pers) 8518 return; 8519 if (mddev->ro) 8520 return; 8521 if (!mddev->pers->sync_request) 8522 return; 8523 8524 spin_lock(&mddev->lock); 8525 if (mddev->in_sync) { 8526 mddev->in_sync = 0; 8527 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 8528 set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 8529 if (mddev->safemode_delay && 8530 mddev->safemode == 0) 8531 mddev->safemode = 1; 8532 spin_unlock(&mddev->lock); 8533 md_update_sb(mddev, 0); 8534 sysfs_notify_dirent_safe(mddev->sysfs_state); 8535 /* wait for the dirty state to be recorded in the metadata */ 8536 wait_event(mddev->sb_wait, 8537 !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); 8538 } else 8539 spin_unlock(&mddev->lock); 8540 } 8541 EXPORT_SYMBOL_GPL(md_allow_write); 8542 8543 #define SYNC_MARKS 10 8544 #define SYNC_MARK_STEP (3*HZ) 8545 #define UPDATE_FREQUENCY (5*60*HZ) 8546 void md_do_sync(struct md_thread *thread) 8547 { 8548 struct mddev *mddev = thread->mddev; 8549 struct mddev *mddev2; 8550 unsigned int currspeed = 0, window; 8551 sector_t max_sectors,j, io_sectors, recovery_done; 8552 unsigned long mark[SYNC_MARKS]; 8553 unsigned long update_time; 8554 sector_t mark_cnt[SYNC_MARKS]; 8555 int last_mark,m; 8556 struct list_head *tmp; 8557 sector_t last_check; 8558 int skipped = 0; 8559 struct md_rdev *rdev; 8560 char *desc, *action = NULL; 8561 struct blk_plug plug; 8562 int ret; 8563 8564 /* just incase thread restarts... */ 8565 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 8566 test_bit(MD_RECOVERY_WAIT, &mddev->recovery)) 8567 return; 8568 if (mddev->ro) {/* never try to sync a read-only array */ 8569 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 8570 return; 8571 } 8572 8573 if (mddev_is_clustered(mddev)) { 8574 ret = md_cluster_ops->resync_start(mddev); 8575 if (ret) 8576 goto skip; 8577 8578 set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags); 8579 if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || 8580 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || 8581 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) 8582 && ((unsigned long long)mddev->curr_resync_completed 8583 < (unsigned long long)mddev->resync_max_sectors)) 8584 goto skip; 8585 } 8586 8587 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 8588 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 8589 desc = "data-check"; 8590 action = "check"; 8591 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 8592 desc = "requested-resync"; 8593 action = "repair"; 8594 } else 8595 desc = "resync"; 8596 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 8597 desc = "reshape"; 8598 else 8599 desc = "recovery"; 8600 8601 mddev->last_sync_action = action ?: desc; 8602 8603 /* we overload curr_resync somewhat here. 8604 * 0 == not engaged in resync at all 8605 * 2 == checking that there is no conflict with another sync 8606 * 1 == like 2, but have yielded to allow conflicting resync to 8607 * commence 8608 * other == active in resync - this many blocks 8609 * 8610 * Before starting a resync we must have set curr_resync to 8611 * 2, and then checked that every "conflicting" array has curr_resync 8612 * less than ours. When we find one that is the same or higher 8613 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 8614 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 8615 * This will mean we have to start checking from the beginning again. 8616 * 8617 */ 8618 8619 do { 8620 int mddev2_minor = -1; 8621 mddev->curr_resync = 2; 8622 8623 try_again: 8624 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8625 goto skip; 8626 for_each_mddev(mddev2, tmp) { 8627 if (mddev2 == mddev) 8628 continue; 8629 if (!mddev->parallel_resync 8630 && mddev2->curr_resync 8631 && match_mddev_units(mddev, mddev2)) { 8632 DEFINE_WAIT(wq); 8633 if (mddev < mddev2 && mddev->curr_resync == 2) { 8634 /* arbitrarily yield */ 8635 mddev->curr_resync = 1; 8636 wake_up(&resync_wait); 8637 } 8638 if (mddev > mddev2 && mddev->curr_resync == 1) 8639 /* no need to wait here, we can wait the next 8640 * time 'round when curr_resync == 2 8641 */ 8642 continue; 8643 /* We need to wait 'interruptible' so as not to 8644 * contribute to the load average, and not to 8645 * be caught by 'softlockup' 8646 */ 8647 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); 8648 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 8649 mddev2->curr_resync >= mddev->curr_resync) { 8650 if (mddev2_minor != mddev2->md_minor) { 8651 mddev2_minor = mddev2->md_minor; 8652 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n", 8653 desc, mdname(mddev), 8654 mdname(mddev2)); 8655 } 8656 mddev_put(mddev2); 8657 if (signal_pending(current)) 8658 flush_signals(current); 8659 schedule(); 8660 finish_wait(&resync_wait, &wq); 8661 goto try_again; 8662 } 8663 finish_wait(&resync_wait, &wq); 8664 } 8665 } 8666 } while (mddev->curr_resync < 2); 8667 8668 j = 0; 8669 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 8670 /* resync follows the size requested by the personality, 8671 * which defaults to physical size, but can be virtual size 8672 */ 8673 max_sectors = mddev->resync_max_sectors; 8674 atomic64_set(&mddev->resync_mismatches, 0); 8675 /* we don't use the checkpoint if there's a bitmap */ 8676 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 8677 j = mddev->resync_min; 8678 else if (!mddev->bitmap) 8679 j = mddev->recovery_cp; 8680 8681 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { 8682 max_sectors = mddev->resync_max_sectors; 8683 /* 8684 * If the original node aborts reshaping then we continue the 8685 * reshaping, so set j again to avoid restart reshape from the 8686 * first beginning 8687 */ 8688 if (mddev_is_clustered(mddev) && 8689 mddev->reshape_position != MaxSector) 8690 j = mddev->reshape_position; 8691 } else { 8692 /* recovery follows the physical size of devices */ 8693 max_sectors = mddev->dev_sectors; 8694 j = MaxSector; 8695 rcu_read_lock(); 8696 rdev_for_each_rcu(rdev, mddev) 8697 if (rdev->raid_disk >= 0 && 8698 !test_bit(Journal, &rdev->flags) && 8699 !test_bit(Faulty, &rdev->flags) && 8700 !test_bit(In_sync, &rdev->flags) && 8701 rdev->recovery_offset < j) 8702 j = rdev->recovery_offset; 8703 rcu_read_unlock(); 8704 8705 /* If there is a bitmap, we need to make sure all 8706 * writes that started before we added a spare 8707 * complete before we start doing a recovery. 8708 * Otherwise the write might complete and (via 8709 * bitmap_endwrite) set a bit in the bitmap after the 8710 * recovery has checked that bit and skipped that 8711 * region. 8712 */ 8713 if (mddev->bitmap) { 8714 mddev->pers->quiesce(mddev, 1); 8715 mddev->pers->quiesce(mddev, 0); 8716 } 8717 } 8718 8719 pr_info("md: %s of RAID array %s\n", desc, mdname(mddev)); 8720 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev)); 8721 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n", 8722 speed_max(mddev), desc); 8723 8724 is_mddev_idle(mddev, 1); /* this initializes IO event counters */ 8725 8726 io_sectors = 0; 8727 for (m = 0; m < SYNC_MARKS; m++) { 8728 mark[m] = jiffies; 8729 mark_cnt[m] = io_sectors; 8730 } 8731 last_mark = 0; 8732 mddev->resync_mark = mark[last_mark]; 8733 mddev->resync_mark_cnt = mark_cnt[last_mark]; 8734 8735 /* 8736 * Tune reconstruction: 8737 */ 8738 window = 32 * (PAGE_SIZE / 512); 8739 pr_debug("md: using %dk window, over a total of %lluk.\n", 8740 window/2, (unsigned long long)max_sectors/2); 8741 8742 atomic_set(&mddev->recovery_active, 0); 8743 last_check = 0; 8744 8745 if (j>2) { 8746 pr_debug("md: resuming %s of %s from checkpoint.\n", 8747 desc, mdname(mddev)); 8748 mddev->curr_resync = j; 8749 } else 8750 mddev->curr_resync = 3; /* no longer delayed */ 8751 mddev->curr_resync_completed = j; 8752 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 8753 md_new_event(mddev); 8754 update_time = jiffies; 8755 8756 blk_start_plug(&plug); 8757 while (j < max_sectors) { 8758 sector_t sectors; 8759 8760 skipped = 0; 8761 8762 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8763 ((mddev->curr_resync > mddev->curr_resync_completed && 8764 (mddev->curr_resync - mddev->curr_resync_completed) 8765 > (max_sectors >> 4)) || 8766 time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || 8767 (j - mddev->curr_resync_completed)*2 8768 >= mddev->resync_max - mddev->curr_resync_completed || 8769 mddev->curr_resync_completed > mddev->resync_max 8770 )) { 8771 /* time to update curr_resync_completed */ 8772 wait_event(mddev->recovery_wait, 8773 atomic_read(&mddev->recovery_active) == 0); 8774 mddev->curr_resync_completed = j; 8775 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 8776 j > mddev->recovery_cp) 8777 mddev->recovery_cp = j; 8778 update_time = jiffies; 8779 set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); 8780 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 8781 } 8782 8783 while (j >= mddev->resync_max && 8784 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 8785 /* As this condition is controlled by user-space, 8786 * we can block indefinitely, so use '_interruptible' 8787 * to avoid triggering warnings. 8788 */ 8789 flush_signals(current); /* just in case */ 8790 wait_event_interruptible(mddev->recovery_wait, 8791 mddev->resync_max > j 8792 || test_bit(MD_RECOVERY_INTR, 8793 &mddev->recovery)); 8794 } 8795 8796 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8797 break; 8798 8799 sectors = mddev->pers->sync_request(mddev, j, &skipped); 8800 if (sectors == 0) { 8801 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 8802 break; 8803 } 8804 8805 if (!skipped) { /* actual IO requested */ 8806 io_sectors += sectors; 8807 atomic_add(sectors, &mddev->recovery_active); 8808 } 8809 8810 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8811 break; 8812 8813 j += sectors; 8814 if (j > max_sectors) 8815 /* when skipping, extra large numbers can be returned. */ 8816 j = max_sectors; 8817 if (j > 2) 8818 mddev->curr_resync = j; 8819 mddev->curr_mark_cnt = io_sectors; 8820 if (last_check == 0) 8821 /* this is the earliest that rebuild will be 8822 * visible in /proc/mdstat 8823 */ 8824 md_new_event(mddev); 8825 8826 if (last_check + window > io_sectors || j == max_sectors) 8827 continue; 8828 8829 last_check = io_sectors; 8830 repeat: 8831 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 8832 /* step marks */ 8833 int next = (last_mark+1) % SYNC_MARKS; 8834 8835 mddev->resync_mark = mark[next]; 8836 mddev->resync_mark_cnt = mark_cnt[next]; 8837 mark[next] = jiffies; 8838 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 8839 last_mark = next; 8840 } 8841 8842 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8843 break; 8844 8845 /* 8846 * this loop exits only if either when we are slower than 8847 * the 'hard' speed limit, or the system was IO-idle for 8848 * a jiffy. 8849 * the system might be non-idle CPU-wise, but we only care 8850 * about not overloading the IO subsystem. (things like an 8851 * e2fsck being done on the RAID array should execute fast) 8852 */ 8853 cond_resched(); 8854 8855 recovery_done = io_sectors - atomic_read(&mddev->recovery_active); 8856 currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 8857 /((jiffies-mddev->resync_mark)/HZ +1) +1; 8858 8859 if (currspeed > speed_min(mddev)) { 8860 if (currspeed > speed_max(mddev)) { 8861 msleep(500); 8862 goto repeat; 8863 } 8864 if (!is_mddev_idle(mddev, 0)) { 8865 /* 8866 * Give other IO more of a chance. 8867 * The faster the devices, the less we wait. 8868 */ 8869 wait_event(mddev->recovery_wait, 8870 !atomic_read(&mddev->recovery_active)); 8871 } 8872 } 8873 } 8874 pr_info("md: %s: %s %s.\n",mdname(mddev), desc, 8875 test_bit(MD_RECOVERY_INTR, &mddev->recovery) 8876 ? "interrupted" : "done"); 8877 /* 8878 * this also signals 'finished resyncing' to md_stop 8879 */ 8880 blk_finish_plug(&plug); 8881 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 8882 8883 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8884 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 8885 mddev->curr_resync > 3) { 8886 mddev->curr_resync_completed = mddev->curr_resync; 8887 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 8888 } 8889 mddev->pers->sync_request(mddev, max_sectors, &skipped); 8890 8891 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && 8892 mddev->curr_resync > 3) { 8893 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 8894 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 8895 if (mddev->curr_resync >= mddev->recovery_cp) { 8896 pr_debug("md: checkpointing %s of %s.\n", 8897 desc, mdname(mddev)); 8898 if (test_bit(MD_RECOVERY_ERROR, 8899 &mddev->recovery)) 8900 mddev->recovery_cp = 8901 mddev->curr_resync_completed; 8902 else 8903 mddev->recovery_cp = 8904 mddev->curr_resync; 8905 } 8906 } else 8907 mddev->recovery_cp = MaxSector; 8908 } else { 8909 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 8910 mddev->curr_resync = MaxSector; 8911 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8912 test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) { 8913 rcu_read_lock(); 8914 rdev_for_each_rcu(rdev, mddev) 8915 if (rdev->raid_disk >= 0 && 8916 mddev->delta_disks >= 0 && 8917 !test_bit(Journal, &rdev->flags) && 8918 !test_bit(Faulty, &rdev->flags) && 8919 !test_bit(In_sync, &rdev->flags) && 8920 rdev->recovery_offset < mddev->curr_resync) 8921 rdev->recovery_offset = mddev->curr_resync; 8922 rcu_read_unlock(); 8923 } 8924 } 8925 } 8926 skip: 8927 /* set CHANGE_PENDING here since maybe another update is needed, 8928 * so other nodes are informed. It should be harmless for normal 8929 * raid */ 8930 set_mask_bits(&mddev->sb_flags, 0, 8931 BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS)); 8932 8933 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 8934 !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 8935 mddev->delta_disks > 0 && 8936 mddev->pers->finish_reshape && 8937 mddev->pers->size && 8938 mddev->queue) { 8939 mddev_lock_nointr(mddev); 8940 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0)); 8941 mddev_unlock(mddev); 8942 if (!mddev_is_clustered(mddev)) { 8943 set_capacity(mddev->gendisk, mddev->array_sectors); 8944 revalidate_disk(mddev->gendisk); 8945 } 8946 } 8947 8948 spin_lock(&mddev->lock); 8949 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 8950 /* We completed so min/max setting can be forgotten if used. */ 8951 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 8952 mddev->resync_min = 0; 8953 mddev->resync_max = MaxSector; 8954 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 8955 mddev->resync_min = mddev->curr_resync_completed; 8956 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 8957 mddev->curr_resync = 0; 8958 spin_unlock(&mddev->lock); 8959 8960 wake_up(&resync_wait); 8961 md_wakeup_thread(mddev->thread); 8962 return; 8963 } 8964 EXPORT_SYMBOL_GPL(md_do_sync); 8965 8966 static int remove_and_add_spares(struct mddev *mddev, 8967 struct md_rdev *this) 8968 { 8969 struct md_rdev *rdev; 8970 int spares = 0; 8971 int removed = 0; 8972 bool remove_some = false; 8973 8974 if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 8975 /* Mustn't remove devices when resync thread is running */ 8976 return 0; 8977 8978 rdev_for_each(rdev, mddev) { 8979 if ((this == NULL || rdev == this) && 8980 rdev->raid_disk >= 0 && 8981 !test_bit(Blocked, &rdev->flags) && 8982 test_bit(Faulty, &rdev->flags) && 8983 atomic_read(&rdev->nr_pending)==0) { 8984 /* Faulty non-Blocked devices with nr_pending == 0 8985 * never get nr_pending incremented, 8986 * never get Faulty cleared, and never get Blocked set. 8987 * So we can synchronize_rcu now rather than once per device 8988 */ 8989 remove_some = true; 8990 set_bit(RemoveSynchronized, &rdev->flags); 8991 } 8992 } 8993 8994 if (remove_some) 8995 synchronize_rcu(); 8996 rdev_for_each(rdev, mddev) { 8997 if ((this == NULL || rdev == this) && 8998 rdev->raid_disk >= 0 && 8999 !test_bit(Blocked, &rdev->flags) && 9000 ((test_bit(RemoveSynchronized, &rdev->flags) || 9001 (!test_bit(In_sync, &rdev->flags) && 9002 !test_bit(Journal, &rdev->flags))) && 9003 atomic_read(&rdev->nr_pending)==0)) { 9004 if (mddev->pers->hot_remove_disk( 9005 mddev, rdev) == 0) { 9006 sysfs_unlink_rdev(mddev, rdev); 9007 rdev->saved_raid_disk = rdev->raid_disk; 9008 rdev->raid_disk = -1; 9009 removed++; 9010 } 9011 } 9012 if (remove_some && test_bit(RemoveSynchronized, &rdev->flags)) 9013 clear_bit(RemoveSynchronized, &rdev->flags); 9014 } 9015 9016 if (removed && mddev->kobj.sd) 9017 sysfs_notify(&mddev->kobj, NULL, "degraded"); 9018 9019 if (this && removed) 9020 goto no_add; 9021 9022 rdev_for_each(rdev, mddev) { 9023 if (this && this != rdev) 9024 continue; 9025 if (test_bit(Candidate, &rdev->flags)) 9026 continue; 9027 if (rdev->raid_disk >= 0 && 9028 !test_bit(In_sync, &rdev->flags) && 9029 !test_bit(Journal, &rdev->flags) && 9030 !test_bit(Faulty, &rdev->flags)) 9031 spares++; 9032 if (rdev->raid_disk >= 0) 9033 continue; 9034 if (test_bit(Faulty, &rdev->flags)) 9035 continue; 9036 if (!test_bit(Journal, &rdev->flags)) { 9037 if (mddev->ro && 9038 ! (rdev->saved_raid_disk >= 0 && 9039 !test_bit(Bitmap_sync, &rdev->flags))) 9040 continue; 9041 9042 rdev->recovery_offset = 0; 9043 } 9044 if (mddev->pers-> 9045 hot_add_disk(mddev, rdev) == 0) { 9046 if (sysfs_link_rdev(mddev, rdev)) 9047 /* failure here is OK */; 9048 if (!test_bit(Journal, &rdev->flags)) 9049 spares++; 9050 md_new_event(mddev); 9051 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 9052 } 9053 } 9054 no_add: 9055 if (removed) 9056 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 9057 return spares; 9058 } 9059 9060 static void md_start_sync(struct work_struct *ws) 9061 { 9062 struct mddev *mddev = container_of(ws, struct mddev, del_work); 9063 9064 mddev->sync_thread = md_register_thread(md_do_sync, 9065 mddev, 9066 "resync"); 9067 if (!mddev->sync_thread) { 9068 pr_warn("%s: could not start resync thread...\n", 9069 mdname(mddev)); 9070 /* leave the spares where they are, it shouldn't hurt */ 9071 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 9072 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 9073 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 9074 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 9075 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 9076 wake_up(&resync_wait); 9077 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 9078 &mddev->recovery)) 9079 if (mddev->sysfs_action) 9080 sysfs_notify_dirent_safe(mddev->sysfs_action); 9081 } else 9082 md_wakeup_thread(mddev->sync_thread); 9083 sysfs_notify_dirent_safe(mddev->sysfs_action); 9084 md_new_event(mddev); 9085 } 9086 9087 /* 9088 * This routine is regularly called by all per-raid-array threads to 9089 * deal with generic issues like resync and super-block update. 9090 * Raid personalities that don't have a thread (linear/raid0) do not 9091 * need this as they never do any recovery or update the superblock. 9092 * 9093 * It does not do any resync itself, but rather "forks" off other threads 9094 * to do that as needed. 9095 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 9096 * "->recovery" and create a thread at ->sync_thread. 9097 * When the thread finishes it sets MD_RECOVERY_DONE 9098 * and wakeups up this thread which will reap the thread and finish up. 9099 * This thread also removes any faulty devices (with nr_pending == 0). 9100 * 9101 * The overall approach is: 9102 * 1/ if the superblock needs updating, update it. 9103 * 2/ If a recovery thread is running, don't do anything else. 9104 * 3/ If recovery has finished, clean up, possibly marking spares active. 9105 * 4/ If there are any faulty devices, remove them. 9106 * 5/ If array is degraded, try to add spares devices 9107 * 6/ If array has spares or is not in-sync, start a resync thread. 9108 */ 9109 void md_check_recovery(struct mddev *mddev) 9110 { 9111 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) { 9112 /* Write superblock - thread that called mddev_suspend() 9113 * holds reconfig_mutex for us. 9114 */ 9115 set_bit(MD_UPDATING_SB, &mddev->flags); 9116 smp_mb__after_atomic(); 9117 if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags)) 9118 md_update_sb(mddev, 0); 9119 clear_bit_unlock(MD_UPDATING_SB, &mddev->flags); 9120 wake_up(&mddev->sb_wait); 9121 } 9122 9123 if (mddev->suspended) 9124 return; 9125 9126 if (mddev->bitmap) 9127 md_bitmap_daemon_work(mddev); 9128 9129 if (signal_pending(current)) { 9130 if (mddev->pers->sync_request && !mddev->external) { 9131 pr_debug("md: %s in immediate safe mode\n", 9132 mdname(mddev)); 9133 mddev->safemode = 2; 9134 } 9135 flush_signals(current); 9136 } 9137 9138 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 9139 return; 9140 if ( ! ( 9141 (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) || 9142 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 9143 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 9144 (mddev->external == 0 && mddev->safemode == 1) || 9145 (mddev->safemode == 2 9146 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 9147 )) 9148 return; 9149 9150 if (mddev_trylock(mddev)) { 9151 int spares = 0; 9152 bool try_set_sync = mddev->safemode != 0; 9153 9154 if (!mddev->external && mddev->safemode == 1) 9155 mddev->safemode = 0; 9156 9157 if (mddev->ro) { 9158 struct md_rdev *rdev; 9159 if (!mddev->external && mddev->in_sync) 9160 /* 'Blocked' flag not needed as failed devices 9161 * will be recorded if array switched to read/write. 9162 * Leaving it set will prevent the device 9163 * from being removed. 9164 */ 9165 rdev_for_each(rdev, mddev) 9166 clear_bit(Blocked, &rdev->flags); 9167 /* On a read-only array we can: 9168 * - remove failed devices 9169 * - add already-in_sync devices if the array itself 9170 * is in-sync. 9171 * As we only add devices that are already in-sync, 9172 * we can activate the spares immediately. 9173 */ 9174 remove_and_add_spares(mddev, NULL); 9175 /* There is no thread, but we need to call 9176 * ->spare_active and clear saved_raid_disk 9177 */ 9178 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 9179 md_reap_sync_thread(mddev); 9180 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 9181 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 9182 clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); 9183 goto unlock; 9184 } 9185 9186 if (mddev_is_clustered(mddev)) { 9187 struct md_rdev *rdev; 9188 /* kick the device if another node issued a 9189 * remove disk. 9190 */ 9191 rdev_for_each(rdev, mddev) { 9192 if (test_and_clear_bit(ClusterRemove, &rdev->flags) && 9193 rdev->raid_disk < 0) 9194 md_kick_rdev_from_array(rdev); 9195 } 9196 } 9197 9198 if (try_set_sync && !mddev->external && !mddev->in_sync) { 9199 spin_lock(&mddev->lock); 9200 set_in_sync(mddev); 9201 spin_unlock(&mddev->lock); 9202 } 9203 9204 if (mddev->sb_flags) 9205 md_update_sb(mddev, 0); 9206 9207 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 9208 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 9209 /* resync/recovery still happening */ 9210 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 9211 goto unlock; 9212 } 9213 if (mddev->sync_thread) { 9214 md_reap_sync_thread(mddev); 9215 goto unlock; 9216 } 9217 /* Set RUNNING before clearing NEEDED to avoid 9218 * any transients in the value of "sync_action". 9219 */ 9220 mddev->curr_resync_completed = 0; 9221 spin_lock(&mddev->lock); 9222 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 9223 spin_unlock(&mddev->lock); 9224 /* Clear some bits that don't mean anything, but 9225 * might be left set 9226 */ 9227 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 9228 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 9229 9230 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 9231 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 9232 goto not_running; 9233 /* no recovery is running. 9234 * remove any failed drives, then 9235 * add spares if possible. 9236 * Spares are also removed and re-added, to allow 9237 * the personality to fail the re-add. 9238 */ 9239 9240 if (mddev->reshape_position != MaxSector) { 9241 if (mddev->pers->check_reshape == NULL || 9242 mddev->pers->check_reshape(mddev) != 0) 9243 /* Cannot proceed */ 9244 goto not_running; 9245 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 9246 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 9247 } else if ((spares = remove_and_add_spares(mddev, NULL))) { 9248 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 9249 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 9250 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 9251 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 9252 } else if (mddev->recovery_cp < MaxSector) { 9253 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 9254 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 9255 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 9256 /* nothing to be done ... */ 9257 goto not_running; 9258 9259 if (mddev->pers->sync_request) { 9260 if (spares) { 9261 /* We are adding a device or devices to an array 9262 * which has the bitmap stored on all devices. 9263 * So make sure all bitmap pages get written 9264 */ 9265 md_bitmap_write_all(mddev->bitmap); 9266 } 9267 INIT_WORK(&mddev->del_work, md_start_sync); 9268 queue_work(md_misc_wq, &mddev->del_work); 9269 goto unlock; 9270 } 9271 not_running: 9272 if (!mddev->sync_thread) { 9273 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 9274 wake_up(&resync_wait); 9275 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 9276 &mddev->recovery)) 9277 if (mddev->sysfs_action) 9278 sysfs_notify_dirent_safe(mddev->sysfs_action); 9279 } 9280 unlock: 9281 wake_up(&mddev->sb_wait); 9282 mddev_unlock(mddev); 9283 } 9284 } 9285 EXPORT_SYMBOL(md_check_recovery); 9286 9287 void md_reap_sync_thread(struct mddev *mddev) 9288 { 9289 struct md_rdev *rdev; 9290 sector_t old_dev_sectors = mddev->dev_sectors; 9291 bool is_reshaped = false; 9292 9293 /* resync has finished, collect result */ 9294 md_unregister_thread(&mddev->sync_thread); 9295 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 9296 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 9297 mddev->degraded != mddev->raid_disks) { 9298 /* success...*/ 9299 /* activate any spares */ 9300 if (mddev->pers->spare_active(mddev)) { 9301 sysfs_notify(&mddev->kobj, NULL, 9302 "degraded"); 9303 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 9304 } 9305 } 9306 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 9307 mddev->pers->finish_reshape) { 9308 mddev->pers->finish_reshape(mddev); 9309 if (mddev_is_clustered(mddev)) 9310 is_reshaped = true; 9311 } 9312 9313 /* If array is no-longer degraded, then any saved_raid_disk 9314 * information must be scrapped. 9315 */ 9316 if (!mddev->degraded) 9317 rdev_for_each(rdev, mddev) 9318 rdev->saved_raid_disk = -1; 9319 9320 md_update_sb(mddev, 1); 9321 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can 9322 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by 9323 * clustered raid */ 9324 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags)) 9325 md_cluster_ops->resync_finish(mddev); 9326 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 9327 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 9328 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 9329 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 9330 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 9331 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 9332 /* 9333 * We call md_cluster_ops->update_size here because sync_size could 9334 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared, 9335 * so it is time to update size across cluster. 9336 */ 9337 if (mddev_is_clustered(mddev) && is_reshaped 9338 && !test_bit(MD_CLOSING, &mddev->flags)) 9339 md_cluster_ops->update_size(mddev, old_dev_sectors); 9340 wake_up(&resync_wait); 9341 /* flag recovery needed just to double check */ 9342 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 9343 sysfs_notify_dirent_safe(mddev->sysfs_action); 9344 md_new_event(mddev); 9345 if (mddev->event_work.func) 9346 queue_work(md_misc_wq, &mddev->event_work); 9347 } 9348 EXPORT_SYMBOL(md_reap_sync_thread); 9349 9350 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) 9351 { 9352 sysfs_notify_dirent_safe(rdev->sysfs_state); 9353 wait_event_timeout(rdev->blocked_wait, 9354 !test_bit(Blocked, &rdev->flags) && 9355 !test_bit(BlockedBadBlocks, &rdev->flags), 9356 msecs_to_jiffies(5000)); 9357 rdev_dec_pending(rdev, mddev); 9358 } 9359 EXPORT_SYMBOL(md_wait_for_blocked_rdev); 9360 9361 void md_finish_reshape(struct mddev *mddev) 9362 { 9363 /* called be personality module when reshape completes. */ 9364 struct md_rdev *rdev; 9365 9366 rdev_for_each(rdev, mddev) { 9367 if (rdev->data_offset > rdev->new_data_offset) 9368 rdev->sectors += rdev->data_offset - rdev->new_data_offset; 9369 else 9370 rdev->sectors -= rdev->new_data_offset - rdev->data_offset; 9371 rdev->data_offset = rdev->new_data_offset; 9372 } 9373 } 9374 EXPORT_SYMBOL(md_finish_reshape); 9375 9376 /* Bad block management */ 9377 9378 /* Returns 1 on success, 0 on failure */ 9379 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 9380 int is_new) 9381 { 9382 struct mddev *mddev = rdev->mddev; 9383 int rv; 9384 if (is_new) 9385 s += rdev->new_data_offset; 9386 else 9387 s += rdev->data_offset; 9388 rv = badblocks_set(&rdev->badblocks, s, sectors, 0); 9389 if (rv == 0) { 9390 /* Make sure they get written out promptly */ 9391 if (test_bit(ExternalBbl, &rdev->flags)) 9392 sysfs_notify(&rdev->kobj, NULL, 9393 "unacknowledged_bad_blocks"); 9394 sysfs_notify_dirent_safe(rdev->sysfs_state); 9395 set_mask_bits(&mddev->sb_flags, 0, 9396 BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING)); 9397 md_wakeup_thread(rdev->mddev->thread); 9398 return 1; 9399 } else 9400 return 0; 9401 } 9402 EXPORT_SYMBOL_GPL(rdev_set_badblocks); 9403 9404 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 9405 int is_new) 9406 { 9407 int rv; 9408 if (is_new) 9409 s += rdev->new_data_offset; 9410 else 9411 s += rdev->data_offset; 9412 rv = badblocks_clear(&rdev->badblocks, s, sectors); 9413 if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags)) 9414 sysfs_notify(&rdev->kobj, NULL, "bad_blocks"); 9415 return rv; 9416 } 9417 EXPORT_SYMBOL_GPL(rdev_clear_badblocks); 9418 9419 static int md_notify_reboot(struct notifier_block *this, 9420 unsigned long code, void *x) 9421 { 9422 struct list_head *tmp; 9423 struct mddev *mddev; 9424 int need_delay = 0; 9425 9426 for_each_mddev(mddev, tmp) { 9427 if (mddev_trylock(mddev)) { 9428 if (mddev->pers) 9429 __md_stop_writes(mddev); 9430 if (mddev->persistent) 9431 mddev->safemode = 2; 9432 mddev_unlock(mddev); 9433 } 9434 need_delay = 1; 9435 } 9436 /* 9437 * certain more exotic SCSI devices are known to be 9438 * volatile wrt too early system reboots. While the 9439 * right place to handle this issue is the given 9440 * driver, we do want to have a safe RAID driver ... 9441 */ 9442 if (need_delay) 9443 mdelay(1000*1); 9444 9445 return NOTIFY_DONE; 9446 } 9447 9448 static struct notifier_block md_notifier = { 9449 .notifier_call = md_notify_reboot, 9450 .next = NULL, 9451 .priority = INT_MAX, /* before any real devices */ 9452 }; 9453 9454 static void md_geninit(void) 9455 { 9456 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 9457 9458 proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops); 9459 } 9460 9461 static int __init md_init(void) 9462 { 9463 int ret = -ENOMEM; 9464 9465 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); 9466 if (!md_wq) 9467 goto err_wq; 9468 9469 md_misc_wq = alloc_workqueue("md_misc", 0, 0); 9470 if (!md_misc_wq) 9471 goto err_misc_wq; 9472 9473 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) 9474 goto err_md; 9475 9476 if ((ret = register_blkdev(0, "mdp")) < 0) 9477 goto err_mdp; 9478 mdp_major = ret; 9479 9480 blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, 9481 md_probe, NULL, NULL); 9482 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, 9483 md_probe, NULL, NULL); 9484 9485 register_reboot_notifier(&md_notifier); 9486 raid_table_header = register_sysctl_table(raid_root_table); 9487 9488 md_geninit(); 9489 return 0; 9490 9491 err_mdp: 9492 unregister_blkdev(MD_MAJOR, "md"); 9493 err_md: 9494 destroy_workqueue(md_misc_wq); 9495 err_misc_wq: 9496 destroy_workqueue(md_wq); 9497 err_wq: 9498 return ret; 9499 } 9500 9501 static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) 9502 { 9503 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 9504 struct md_rdev *rdev2; 9505 int role, ret; 9506 char b[BDEVNAME_SIZE]; 9507 9508 /* 9509 * If size is changed in another node then we need to 9510 * do resize as well. 9511 */ 9512 if (mddev->dev_sectors != le64_to_cpu(sb->size)) { 9513 ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size)); 9514 if (ret) 9515 pr_info("md-cluster: resize failed\n"); 9516 else 9517 md_bitmap_update_sb(mddev->bitmap); 9518 } 9519 9520 /* Check for change of roles in the active devices */ 9521 rdev_for_each(rdev2, mddev) { 9522 if (test_bit(Faulty, &rdev2->flags)) 9523 continue; 9524 9525 /* Check if the roles changed */ 9526 role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); 9527 9528 if (test_bit(Candidate, &rdev2->flags)) { 9529 if (role == 0xfffe) { 9530 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); 9531 md_kick_rdev_from_array(rdev2); 9532 continue; 9533 } 9534 else 9535 clear_bit(Candidate, &rdev2->flags); 9536 } 9537 9538 if (role != rdev2->raid_disk) { 9539 /* 9540 * got activated except reshape is happening. 9541 */ 9542 if (rdev2->raid_disk == -1 && role != 0xffff && 9543 !(le32_to_cpu(sb->feature_map) & 9544 MD_FEATURE_RESHAPE_ACTIVE)) { 9545 rdev2->saved_raid_disk = role; 9546 ret = remove_and_add_spares(mddev, rdev2); 9547 pr_info("Activated spare: %s\n", 9548 bdevname(rdev2->bdev,b)); 9549 /* wakeup mddev->thread here, so array could 9550 * perform resync with the new activated disk */ 9551 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 9552 md_wakeup_thread(mddev->thread); 9553 } 9554 /* device faulty 9555 * We just want to do the minimum to mark the disk 9556 * as faulty. The recovery is performed by the 9557 * one who initiated the error. 9558 */ 9559 if ((role == 0xfffe) || (role == 0xfffd)) { 9560 md_error(mddev, rdev2); 9561 clear_bit(Blocked, &rdev2->flags); 9562 } 9563 } 9564 } 9565 9566 if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) 9567 update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); 9568 9569 /* 9570 * Since mddev->delta_disks has already updated in update_raid_disks, 9571 * so it is time to check reshape. 9572 */ 9573 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && 9574 (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { 9575 /* 9576 * reshape is happening in the remote node, we need to 9577 * update reshape_position and call start_reshape. 9578 */ 9579 mddev->reshape_position = le64_to_cpu(sb->reshape_position); 9580 if (mddev->pers->update_reshape_pos) 9581 mddev->pers->update_reshape_pos(mddev); 9582 if (mddev->pers->start_reshape) 9583 mddev->pers->start_reshape(mddev); 9584 } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && 9585 mddev->reshape_position != MaxSector && 9586 !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { 9587 /* reshape is just done in another node. */ 9588 mddev->reshape_position = MaxSector; 9589 if (mddev->pers->update_reshape_pos) 9590 mddev->pers->update_reshape_pos(mddev); 9591 } 9592 9593 /* Finally set the event to be up to date */ 9594 mddev->events = le64_to_cpu(sb->events); 9595 } 9596 9597 static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) 9598 { 9599 int err; 9600 struct page *swapout = rdev->sb_page; 9601 struct mdp_superblock_1 *sb; 9602 9603 /* Store the sb page of the rdev in the swapout temporary 9604 * variable in case we err in the future 9605 */ 9606 rdev->sb_page = NULL; 9607 err = alloc_disk_sb(rdev); 9608 if (err == 0) { 9609 ClearPageUptodate(rdev->sb_page); 9610 rdev->sb_loaded = 0; 9611 err = super_types[mddev->major_version]. 9612 load_super(rdev, NULL, mddev->minor_version); 9613 } 9614 if (err < 0) { 9615 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", 9616 __func__, __LINE__, rdev->desc_nr, err); 9617 if (rdev->sb_page) 9618 put_page(rdev->sb_page); 9619 rdev->sb_page = swapout; 9620 rdev->sb_loaded = 1; 9621 return err; 9622 } 9623 9624 sb = page_address(rdev->sb_page); 9625 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET 9626 * is not set 9627 */ 9628 9629 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) 9630 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 9631 9632 /* The other node finished recovery, call spare_active to set 9633 * device In_sync and mddev->degraded 9634 */ 9635 if (rdev->recovery_offset == MaxSector && 9636 !test_bit(In_sync, &rdev->flags) && 9637 mddev->pers->spare_active(mddev)) 9638 sysfs_notify(&mddev->kobj, NULL, "degraded"); 9639 9640 put_page(swapout); 9641 return 0; 9642 } 9643 9644 void md_reload_sb(struct mddev *mddev, int nr) 9645 { 9646 struct md_rdev *rdev; 9647 int err; 9648 9649 /* Find the rdev */ 9650 rdev_for_each_rcu(rdev, mddev) { 9651 if (rdev->desc_nr == nr) 9652 break; 9653 } 9654 9655 if (!rdev || rdev->desc_nr != nr) { 9656 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); 9657 return; 9658 } 9659 9660 err = read_rdev(mddev, rdev); 9661 if (err < 0) 9662 return; 9663 9664 check_sb_changes(mddev, rdev); 9665 9666 /* Read all rdev's to update recovery_offset */ 9667 rdev_for_each_rcu(rdev, mddev) { 9668 if (!test_bit(Faulty, &rdev->flags)) 9669 read_rdev(mddev, rdev); 9670 } 9671 } 9672 EXPORT_SYMBOL(md_reload_sb); 9673 9674 #ifndef MODULE 9675 9676 /* 9677 * Searches all registered partitions for autorun RAID arrays 9678 * at boot time. 9679 */ 9680 9681 static DEFINE_MUTEX(detected_devices_mutex); 9682 static LIST_HEAD(all_detected_devices); 9683 struct detected_devices_node { 9684 struct list_head list; 9685 dev_t dev; 9686 }; 9687 9688 void md_autodetect_dev(dev_t dev) 9689 { 9690 struct detected_devices_node *node_detected_dev; 9691 9692 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); 9693 if (node_detected_dev) { 9694 node_detected_dev->dev = dev; 9695 mutex_lock(&detected_devices_mutex); 9696 list_add_tail(&node_detected_dev->list, &all_detected_devices); 9697 mutex_unlock(&detected_devices_mutex); 9698 } 9699 } 9700 9701 static void autostart_arrays(int part) 9702 { 9703 struct md_rdev *rdev; 9704 struct detected_devices_node *node_detected_dev; 9705 dev_t dev; 9706 int i_scanned, i_passed; 9707 9708 i_scanned = 0; 9709 i_passed = 0; 9710 9711 pr_info("md: Autodetecting RAID arrays.\n"); 9712 9713 mutex_lock(&detected_devices_mutex); 9714 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { 9715 i_scanned++; 9716 node_detected_dev = list_entry(all_detected_devices.next, 9717 struct detected_devices_node, list); 9718 list_del(&node_detected_dev->list); 9719 dev = node_detected_dev->dev; 9720 kfree(node_detected_dev); 9721 mutex_unlock(&detected_devices_mutex); 9722 rdev = md_import_device(dev,0, 90); 9723 mutex_lock(&detected_devices_mutex); 9724 if (IS_ERR(rdev)) 9725 continue; 9726 9727 if (test_bit(Faulty, &rdev->flags)) 9728 continue; 9729 9730 set_bit(AutoDetected, &rdev->flags); 9731 list_add(&rdev->same_set, &pending_raid_disks); 9732 i_passed++; 9733 } 9734 mutex_unlock(&detected_devices_mutex); 9735 9736 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed); 9737 9738 autorun_devices(part); 9739 } 9740 9741 #endif /* !MODULE */ 9742 9743 static __exit void md_exit(void) 9744 { 9745 struct mddev *mddev; 9746 struct list_head *tmp; 9747 int delay = 1; 9748 9749 blk_unregister_region(MKDEV(MD_MAJOR,0), 512); 9750 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); 9751 9752 unregister_blkdev(MD_MAJOR,"md"); 9753 unregister_blkdev(mdp_major, "mdp"); 9754 unregister_reboot_notifier(&md_notifier); 9755 unregister_sysctl_table(raid_table_header); 9756 9757 /* We cannot unload the modules while some process is 9758 * waiting for us in select() or poll() - wake them up 9759 */ 9760 md_unloading = 1; 9761 while (waitqueue_active(&md_event_waiters)) { 9762 /* not safe to leave yet */ 9763 wake_up(&md_event_waiters); 9764 msleep(delay); 9765 delay += delay; 9766 } 9767 remove_proc_entry("mdstat", NULL); 9768 9769 for_each_mddev(mddev, tmp) { 9770 export_array(mddev); 9771 mddev->ctime = 0; 9772 mddev->hold_active = 0; 9773 /* 9774 * for_each_mddev() will call mddev_put() at the end of each 9775 * iteration. As the mddev is now fully clear, this will 9776 * schedule the mddev for destruction by a workqueue, and the 9777 * destroy_workqueue() below will wait for that to complete. 9778 */ 9779 } 9780 destroy_workqueue(md_misc_wq); 9781 destroy_workqueue(md_wq); 9782 } 9783 9784 subsys_initcall(md_init); 9785 module_exit(md_exit) 9786 9787 static int get_ro(char *buffer, const struct kernel_param *kp) 9788 { 9789 return sprintf(buffer, "%d", start_readonly); 9790 } 9791 static int set_ro(const char *val, const struct kernel_param *kp) 9792 { 9793 return kstrtouint(val, 10, (unsigned int *)&start_readonly); 9794 } 9795 9796 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); 9797 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); 9798 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); 9799 module_param(create_on_open, bool, S_IRUSR|S_IWUSR); 9800 9801 MODULE_LICENSE("GPL"); 9802 MODULE_DESCRIPTION("MD RAID framework"); 9803 MODULE_ALIAS("md"); 9804 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 9805