1 /* 2 md.c : Multiple Devices driver for Linux 3 Copyright (C) 1998, 1999, 2000 Ingo Molnar 4 5 completely rewritten, based on the MD driver code from Marc Zyngier 6 7 Changes: 8 9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar 10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> 11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> 12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su> 13 - kmod support by: Cyrus Durgin 14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> 15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> 16 17 - lots of fixes and improvements to the RAID1/RAID5 and generic 18 RAID code (such as request based resynchronization): 19 20 Neil Brown <neilb@cse.unsw.edu.au>. 21 22 - persistent bitmap code 23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. 24 25 This program is free software; you can redistribute it and/or modify 26 it under the terms of the GNU General Public License as published by 27 the Free Software Foundation; either version 2, or (at your option) 28 any later version. 29 30 You should have received a copy of the GNU General Public License 31 (for example /usr/src/linux/COPYING); if not, write to the Free 32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 33 */ 34 35 #include <linux/kthread.h> 36 #include <linux/blkdev.h> 37 #include <linux/sysctl.h> 38 #include <linux/seq_file.h> 39 #include <linux/fs.h> 40 #include <linux/poll.h> 41 #include <linux/ctype.h> 42 #include <linux/string.h> 43 #include <linux/hdreg.h> 44 #include <linux/proc_fs.h> 45 #include <linux/random.h> 46 #include <linux/module.h> 47 #include <linux/reboot.h> 48 #include <linux/file.h> 49 #include <linux/compat.h> 50 #include <linux/delay.h> 51 #include <linux/raid/md_p.h> 52 #include <linux/raid/md_u.h> 53 #include <linux/slab.h> 54 #include "md.h" 55 #include "bitmap.h" 56 57 #ifndef MODULE 58 static void autostart_arrays(int part); 59 #endif 60 61 /* pers_list is a list of registered personalities protected 62 * by pers_lock. 63 * pers_lock does extra service to protect accesses to 64 * mddev->thread when the mutex cannot be held. 65 */ 66 static LIST_HEAD(pers_list); 67 static DEFINE_SPINLOCK(pers_lock); 68 69 static void md_print_devices(void); 70 71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 72 static struct workqueue_struct *md_wq; 73 static struct workqueue_struct *md_misc_wq; 74 75 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } 76 77 /* 78 * Default number of read corrections we'll attempt on an rdev 79 * before ejecting it from the array. We divide the read error 80 * count by 2 for every hour elapsed between read errors. 81 */ 82 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 83 /* 84 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 85 * is 1000 KB/sec, so the extra system load does not show up that much. 86 * Increase it if you want to have more _guaranteed_ speed. Note that 87 * the RAID driver will use the maximum available bandwidth if the IO 88 * subsystem is idle. There is also an 'absolute maximum' reconstruction 89 * speed limit - in case reconstruction slows down your system despite 90 * idle IO detection. 91 * 92 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 93 * or /sys/block/mdX/md/sync_speed_{min,max} 94 */ 95 96 static int sysctl_speed_limit_min = 1000; 97 static int sysctl_speed_limit_max = 200000; 98 static inline int speed_min(struct mddev *mddev) 99 { 100 return mddev->sync_speed_min ? 101 mddev->sync_speed_min : sysctl_speed_limit_min; 102 } 103 104 static inline int speed_max(struct mddev *mddev) 105 { 106 return mddev->sync_speed_max ? 107 mddev->sync_speed_max : sysctl_speed_limit_max; 108 } 109 110 static struct ctl_table_header *raid_table_header; 111 112 static ctl_table raid_table[] = { 113 { 114 .procname = "speed_limit_min", 115 .data = &sysctl_speed_limit_min, 116 .maxlen = sizeof(int), 117 .mode = S_IRUGO|S_IWUSR, 118 .proc_handler = proc_dointvec, 119 }, 120 { 121 .procname = "speed_limit_max", 122 .data = &sysctl_speed_limit_max, 123 .maxlen = sizeof(int), 124 .mode = S_IRUGO|S_IWUSR, 125 .proc_handler = proc_dointvec, 126 }, 127 { } 128 }; 129 130 static ctl_table raid_dir_table[] = { 131 { 132 .procname = "raid", 133 .maxlen = 0, 134 .mode = S_IRUGO|S_IXUGO, 135 .child = raid_table, 136 }, 137 { } 138 }; 139 140 static ctl_table raid_root_table[] = { 141 { 142 .procname = "dev", 143 .maxlen = 0, 144 .mode = 0555, 145 .child = raid_dir_table, 146 }, 147 { } 148 }; 149 150 static const struct block_device_operations md_fops; 151 152 static int start_readonly; 153 154 /* bio_clone_mddev 155 * like bio_clone, but with a local bio set 156 */ 157 158 static void mddev_bio_destructor(struct bio *bio) 159 { 160 struct mddev *mddev, **mddevp; 161 162 mddevp = (void*)bio; 163 mddev = mddevp[-1]; 164 165 bio_free(bio, mddev->bio_set); 166 } 167 168 struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, 169 struct mddev *mddev) 170 { 171 struct bio *b; 172 struct mddev **mddevp; 173 174 if (!mddev || !mddev->bio_set) 175 return bio_alloc(gfp_mask, nr_iovecs); 176 177 b = bio_alloc_bioset(gfp_mask, nr_iovecs, 178 mddev->bio_set); 179 if (!b) 180 return NULL; 181 mddevp = (void*)b; 182 mddevp[-1] = mddev; 183 b->bi_destructor = mddev_bio_destructor; 184 return b; 185 } 186 EXPORT_SYMBOL_GPL(bio_alloc_mddev); 187 188 struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, 189 struct mddev *mddev) 190 { 191 struct bio *b; 192 struct mddev **mddevp; 193 194 if (!mddev || !mddev->bio_set) 195 return bio_clone(bio, gfp_mask); 196 197 b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, 198 mddev->bio_set); 199 if (!b) 200 return NULL; 201 mddevp = (void*)b; 202 mddevp[-1] = mddev; 203 b->bi_destructor = mddev_bio_destructor; 204 __bio_clone(b, bio); 205 if (bio_integrity(bio)) { 206 int ret; 207 208 ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set); 209 210 if (ret < 0) { 211 bio_put(b); 212 return NULL; 213 } 214 } 215 216 return b; 217 } 218 EXPORT_SYMBOL_GPL(bio_clone_mddev); 219 220 void md_trim_bio(struct bio *bio, int offset, int size) 221 { 222 /* 'bio' is a cloned bio which we need to trim to match 223 * the given offset and size. 224 * This requires adjusting bi_sector, bi_size, and bi_io_vec 225 */ 226 int i; 227 struct bio_vec *bvec; 228 int sofar = 0; 229 230 size <<= 9; 231 if (offset == 0 && size == bio->bi_size) 232 return; 233 234 bio->bi_sector += offset; 235 bio->bi_size = size; 236 offset <<= 9; 237 clear_bit(BIO_SEG_VALID, &bio->bi_flags); 238 239 while (bio->bi_idx < bio->bi_vcnt && 240 bio->bi_io_vec[bio->bi_idx].bv_len <= offset) { 241 /* remove this whole bio_vec */ 242 offset -= bio->bi_io_vec[bio->bi_idx].bv_len; 243 bio->bi_idx++; 244 } 245 if (bio->bi_idx < bio->bi_vcnt) { 246 bio->bi_io_vec[bio->bi_idx].bv_offset += offset; 247 bio->bi_io_vec[bio->bi_idx].bv_len -= offset; 248 } 249 /* avoid any complications with bi_idx being non-zero*/ 250 if (bio->bi_idx) { 251 memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx, 252 (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec)); 253 bio->bi_vcnt -= bio->bi_idx; 254 bio->bi_idx = 0; 255 } 256 /* Make sure vcnt and last bv are not too big */ 257 bio_for_each_segment(bvec, bio, i) { 258 if (sofar + bvec->bv_len > size) 259 bvec->bv_len = size - sofar; 260 if (bvec->bv_len == 0) { 261 bio->bi_vcnt = i; 262 break; 263 } 264 sofar += bvec->bv_len; 265 } 266 } 267 EXPORT_SYMBOL_GPL(md_trim_bio); 268 269 /* 270 * We have a system wide 'event count' that is incremented 271 * on any 'interesting' event, and readers of /proc/mdstat 272 * can use 'poll' or 'select' to find out when the event 273 * count increases. 274 * 275 * Events are: 276 * start array, stop array, error, add device, remove device, 277 * start build, activate spare 278 */ 279 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); 280 static atomic_t md_event_count; 281 void md_new_event(struct mddev *mddev) 282 { 283 atomic_inc(&md_event_count); 284 wake_up(&md_event_waiters); 285 } 286 EXPORT_SYMBOL_GPL(md_new_event); 287 288 /* Alternate version that can be called from interrupts 289 * when calling sysfs_notify isn't needed. 290 */ 291 static void md_new_event_inintr(struct mddev *mddev) 292 { 293 atomic_inc(&md_event_count); 294 wake_up(&md_event_waiters); 295 } 296 297 /* 298 * Enables to iterate over all existing md arrays 299 * all_mddevs_lock protects this list. 300 */ 301 static LIST_HEAD(all_mddevs); 302 static DEFINE_SPINLOCK(all_mddevs_lock); 303 304 305 /* 306 * iterates through all used mddevs in the system. 307 * We take care to grab the all_mddevs_lock whenever navigating 308 * the list, and to always hold a refcount when unlocked. 309 * Any code which breaks out of this loop while own 310 * a reference to the current mddev and must mddev_put it. 311 */ 312 #define for_each_mddev(_mddev,_tmp) \ 313 \ 314 for (({ spin_lock(&all_mddevs_lock); \ 315 _tmp = all_mddevs.next; \ 316 _mddev = NULL;}); \ 317 ({ if (_tmp != &all_mddevs) \ 318 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ 319 spin_unlock(&all_mddevs_lock); \ 320 if (_mddev) mddev_put(_mddev); \ 321 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ 322 _tmp != &all_mddevs;}); \ 323 ({ spin_lock(&all_mddevs_lock); \ 324 _tmp = _tmp->next;}) \ 325 ) 326 327 328 /* Rather than calling directly into the personality make_request function, 329 * IO requests come here first so that we can check if the device is 330 * being suspended pending a reconfiguration. 331 * We hold a refcount over the call to ->make_request. By the time that 332 * call has finished, the bio has been linked into some internal structure 333 * and so is visible to ->quiesce(), so we don't need the refcount any more. 334 */ 335 static void md_make_request(struct request_queue *q, struct bio *bio) 336 { 337 const int rw = bio_data_dir(bio); 338 struct mddev *mddev = q->queuedata; 339 int cpu; 340 unsigned int sectors; 341 342 if (mddev == NULL || mddev->pers == NULL 343 || !mddev->ready) { 344 bio_io_error(bio); 345 return; 346 } 347 smp_rmb(); /* Ensure implications of 'active' are visible */ 348 rcu_read_lock(); 349 if (mddev->suspended) { 350 DEFINE_WAIT(__wait); 351 for (;;) { 352 prepare_to_wait(&mddev->sb_wait, &__wait, 353 TASK_UNINTERRUPTIBLE); 354 if (!mddev->suspended) 355 break; 356 rcu_read_unlock(); 357 schedule(); 358 rcu_read_lock(); 359 } 360 finish_wait(&mddev->sb_wait, &__wait); 361 } 362 atomic_inc(&mddev->active_io); 363 rcu_read_unlock(); 364 365 /* 366 * save the sectors now since our bio can 367 * go away inside make_request 368 */ 369 sectors = bio_sectors(bio); 370 mddev->pers->make_request(mddev, bio); 371 372 cpu = part_stat_lock(); 373 part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); 374 part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); 375 part_stat_unlock(); 376 377 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) 378 wake_up(&mddev->sb_wait); 379 } 380 381 /* mddev_suspend makes sure no new requests are submitted 382 * to the device, and that any requests that have been submitted 383 * are completely handled. 384 * Once ->stop is called and completes, the module will be completely 385 * unused. 386 */ 387 void mddev_suspend(struct mddev *mddev) 388 { 389 BUG_ON(mddev->suspended); 390 mddev->suspended = 1; 391 synchronize_rcu(); 392 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); 393 mddev->pers->quiesce(mddev, 1); 394 } 395 EXPORT_SYMBOL_GPL(mddev_suspend); 396 397 void mddev_resume(struct mddev *mddev) 398 { 399 mddev->suspended = 0; 400 wake_up(&mddev->sb_wait); 401 mddev->pers->quiesce(mddev, 0); 402 403 md_wakeup_thread(mddev->thread); 404 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 405 } 406 EXPORT_SYMBOL_GPL(mddev_resume); 407 408 int mddev_congested(struct mddev *mddev, int bits) 409 { 410 return mddev->suspended; 411 } 412 EXPORT_SYMBOL(mddev_congested); 413 414 /* 415 * Generic flush handling for md 416 */ 417 418 static void md_end_flush(struct bio *bio, int err) 419 { 420 struct md_rdev *rdev = bio->bi_private; 421 struct mddev *mddev = rdev->mddev; 422 423 rdev_dec_pending(rdev, mddev); 424 425 if (atomic_dec_and_test(&mddev->flush_pending)) { 426 /* The pre-request flush has finished */ 427 queue_work(md_wq, &mddev->flush_work); 428 } 429 bio_put(bio); 430 } 431 432 static void md_submit_flush_data(struct work_struct *ws); 433 434 static void submit_flushes(struct work_struct *ws) 435 { 436 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 437 struct md_rdev *rdev; 438 439 INIT_WORK(&mddev->flush_work, md_submit_flush_data); 440 atomic_set(&mddev->flush_pending, 1); 441 rcu_read_lock(); 442 rdev_for_each_rcu(rdev, mddev) 443 if (rdev->raid_disk >= 0 && 444 !test_bit(Faulty, &rdev->flags)) { 445 /* Take two references, one is dropped 446 * when request finishes, one after 447 * we reclaim rcu_read_lock 448 */ 449 struct bio *bi; 450 atomic_inc(&rdev->nr_pending); 451 atomic_inc(&rdev->nr_pending); 452 rcu_read_unlock(); 453 bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); 454 bi->bi_end_io = md_end_flush; 455 bi->bi_private = rdev; 456 bi->bi_bdev = rdev->bdev; 457 atomic_inc(&mddev->flush_pending); 458 submit_bio(WRITE_FLUSH, bi); 459 rcu_read_lock(); 460 rdev_dec_pending(rdev, mddev); 461 } 462 rcu_read_unlock(); 463 if (atomic_dec_and_test(&mddev->flush_pending)) 464 queue_work(md_wq, &mddev->flush_work); 465 } 466 467 static void md_submit_flush_data(struct work_struct *ws) 468 { 469 struct mddev *mddev = container_of(ws, struct mddev, flush_work); 470 struct bio *bio = mddev->flush_bio; 471 472 if (bio->bi_size == 0) 473 /* an empty barrier - all done */ 474 bio_endio(bio, 0); 475 else { 476 bio->bi_rw &= ~REQ_FLUSH; 477 mddev->pers->make_request(mddev, bio); 478 } 479 480 mddev->flush_bio = NULL; 481 wake_up(&mddev->sb_wait); 482 } 483 484 void md_flush_request(struct mddev *mddev, struct bio *bio) 485 { 486 spin_lock_irq(&mddev->write_lock); 487 wait_event_lock_irq(mddev->sb_wait, 488 !mddev->flush_bio, 489 mddev->write_lock, /*nothing*/); 490 mddev->flush_bio = bio; 491 spin_unlock_irq(&mddev->write_lock); 492 493 INIT_WORK(&mddev->flush_work, submit_flushes); 494 queue_work(md_wq, &mddev->flush_work); 495 } 496 EXPORT_SYMBOL(md_flush_request); 497 498 /* Support for plugging. 499 * This mirrors the plugging support in request_queue, but does not 500 * require having a whole queue or request structures. 501 * We allocate an md_plug_cb for each md device and each thread it gets 502 * plugged on. This links tot the private plug_handle structure in the 503 * personality data where we keep a count of the number of outstanding 504 * plugs so other code can see if a plug is active. 505 */ 506 struct md_plug_cb { 507 struct blk_plug_cb cb; 508 struct mddev *mddev; 509 }; 510 511 static void plugger_unplug(struct blk_plug_cb *cb) 512 { 513 struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb); 514 if (atomic_dec_and_test(&mdcb->mddev->plug_cnt)) 515 md_wakeup_thread(mdcb->mddev->thread); 516 kfree(mdcb); 517 } 518 519 /* Check that an unplug wakeup will come shortly. 520 * If not, wakeup the md thread immediately 521 */ 522 int mddev_check_plugged(struct mddev *mddev) 523 { 524 struct blk_plug *plug = current->plug; 525 struct md_plug_cb *mdcb; 526 527 if (!plug) 528 return 0; 529 530 list_for_each_entry(mdcb, &plug->cb_list, cb.list) { 531 if (mdcb->cb.callback == plugger_unplug && 532 mdcb->mddev == mddev) { 533 /* Already on the list, move to top */ 534 if (mdcb != list_first_entry(&plug->cb_list, 535 struct md_plug_cb, 536 cb.list)) 537 list_move(&mdcb->cb.list, &plug->cb_list); 538 return 1; 539 } 540 } 541 /* Not currently on the callback list */ 542 mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC); 543 if (!mdcb) 544 return 0; 545 546 mdcb->mddev = mddev; 547 mdcb->cb.callback = plugger_unplug; 548 atomic_inc(&mddev->plug_cnt); 549 list_add(&mdcb->cb.list, &plug->cb_list); 550 return 1; 551 } 552 EXPORT_SYMBOL_GPL(mddev_check_plugged); 553 554 static inline struct mddev *mddev_get(struct mddev *mddev) 555 { 556 atomic_inc(&mddev->active); 557 return mddev; 558 } 559 560 static void mddev_delayed_delete(struct work_struct *ws); 561 562 static void mddev_put(struct mddev *mddev) 563 { 564 struct bio_set *bs = NULL; 565 566 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 567 return; 568 if (!mddev->raid_disks && list_empty(&mddev->disks) && 569 mddev->ctime == 0 && !mddev->hold_active) { 570 /* Array is not configured at all, and not held active, 571 * so destroy it */ 572 list_del_init(&mddev->all_mddevs); 573 bs = mddev->bio_set; 574 mddev->bio_set = NULL; 575 if (mddev->gendisk) { 576 /* We did a probe so need to clean up. Call 577 * queue_work inside the spinlock so that 578 * flush_workqueue() after mddev_find will 579 * succeed in waiting for the work to be done. 580 */ 581 INIT_WORK(&mddev->del_work, mddev_delayed_delete); 582 queue_work(md_misc_wq, &mddev->del_work); 583 } else 584 kfree(mddev); 585 } 586 spin_unlock(&all_mddevs_lock); 587 if (bs) 588 bioset_free(bs); 589 } 590 591 void mddev_init(struct mddev *mddev) 592 { 593 mutex_init(&mddev->open_mutex); 594 mutex_init(&mddev->reconfig_mutex); 595 mutex_init(&mddev->bitmap_info.mutex); 596 INIT_LIST_HEAD(&mddev->disks); 597 INIT_LIST_HEAD(&mddev->all_mddevs); 598 init_timer(&mddev->safemode_timer); 599 atomic_set(&mddev->active, 1); 600 atomic_set(&mddev->openers, 0); 601 atomic_set(&mddev->active_io, 0); 602 atomic_set(&mddev->plug_cnt, 0); 603 spin_lock_init(&mddev->write_lock); 604 atomic_set(&mddev->flush_pending, 0); 605 init_waitqueue_head(&mddev->sb_wait); 606 init_waitqueue_head(&mddev->recovery_wait); 607 mddev->reshape_position = MaxSector; 608 mddev->resync_min = 0; 609 mddev->resync_max = MaxSector; 610 mddev->level = LEVEL_NONE; 611 } 612 EXPORT_SYMBOL_GPL(mddev_init); 613 614 static struct mddev * mddev_find(dev_t unit) 615 { 616 struct mddev *mddev, *new = NULL; 617 618 if (unit && MAJOR(unit) != MD_MAJOR) 619 unit &= ~((1<<MdpMinorShift)-1); 620 621 retry: 622 spin_lock(&all_mddevs_lock); 623 624 if (unit) { 625 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 626 if (mddev->unit == unit) { 627 mddev_get(mddev); 628 spin_unlock(&all_mddevs_lock); 629 kfree(new); 630 return mddev; 631 } 632 633 if (new) { 634 list_add(&new->all_mddevs, &all_mddevs); 635 spin_unlock(&all_mddevs_lock); 636 new->hold_active = UNTIL_IOCTL; 637 return new; 638 } 639 } else if (new) { 640 /* find an unused unit number */ 641 static int next_minor = 512; 642 int start = next_minor; 643 int is_free = 0; 644 int dev = 0; 645 while (!is_free) { 646 dev = MKDEV(MD_MAJOR, next_minor); 647 next_minor++; 648 if (next_minor > MINORMASK) 649 next_minor = 0; 650 if (next_minor == start) { 651 /* Oh dear, all in use. */ 652 spin_unlock(&all_mddevs_lock); 653 kfree(new); 654 return NULL; 655 } 656 657 is_free = 1; 658 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 659 if (mddev->unit == dev) { 660 is_free = 0; 661 break; 662 } 663 } 664 new->unit = dev; 665 new->md_minor = MINOR(dev); 666 new->hold_active = UNTIL_STOP; 667 list_add(&new->all_mddevs, &all_mddevs); 668 spin_unlock(&all_mddevs_lock); 669 return new; 670 } 671 spin_unlock(&all_mddevs_lock); 672 673 new = kzalloc(sizeof(*new), GFP_KERNEL); 674 if (!new) 675 return NULL; 676 677 new->unit = unit; 678 if (MAJOR(unit) == MD_MAJOR) 679 new->md_minor = MINOR(unit); 680 else 681 new->md_minor = MINOR(unit) >> MdpMinorShift; 682 683 mddev_init(new); 684 685 goto retry; 686 } 687 688 static inline int mddev_lock(struct mddev * mddev) 689 { 690 return mutex_lock_interruptible(&mddev->reconfig_mutex); 691 } 692 693 static inline int mddev_is_locked(struct mddev *mddev) 694 { 695 return mutex_is_locked(&mddev->reconfig_mutex); 696 } 697 698 static inline int mddev_trylock(struct mddev * mddev) 699 { 700 return mutex_trylock(&mddev->reconfig_mutex); 701 } 702 703 static struct attribute_group md_redundancy_group; 704 705 static void mddev_unlock(struct mddev * mddev) 706 { 707 if (mddev->to_remove) { 708 /* These cannot be removed under reconfig_mutex as 709 * an access to the files will try to take reconfig_mutex 710 * while holding the file unremovable, which leads to 711 * a deadlock. 712 * So hold set sysfs_active while the remove in happeing, 713 * and anything else which might set ->to_remove or my 714 * otherwise change the sysfs namespace will fail with 715 * -EBUSY if sysfs_active is still set. 716 * We set sysfs_active under reconfig_mutex and elsewhere 717 * test it under the same mutex to ensure its correct value 718 * is seen. 719 */ 720 struct attribute_group *to_remove = mddev->to_remove; 721 mddev->to_remove = NULL; 722 mddev->sysfs_active = 1; 723 mutex_unlock(&mddev->reconfig_mutex); 724 725 if (mddev->kobj.sd) { 726 if (to_remove != &md_redundancy_group) 727 sysfs_remove_group(&mddev->kobj, to_remove); 728 if (mddev->pers == NULL || 729 mddev->pers->sync_request == NULL) { 730 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 731 if (mddev->sysfs_action) 732 sysfs_put(mddev->sysfs_action); 733 mddev->sysfs_action = NULL; 734 } 735 } 736 mddev->sysfs_active = 0; 737 } else 738 mutex_unlock(&mddev->reconfig_mutex); 739 740 /* As we've dropped the mutex we need a spinlock to 741 * make sure the thread doesn't disappear 742 */ 743 spin_lock(&pers_lock); 744 md_wakeup_thread(mddev->thread); 745 spin_unlock(&pers_lock); 746 } 747 748 static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr) 749 { 750 struct md_rdev *rdev; 751 752 rdev_for_each(rdev, mddev) 753 if (rdev->desc_nr == nr) 754 return rdev; 755 756 return NULL; 757 } 758 759 static struct md_rdev * find_rdev(struct mddev * mddev, dev_t dev) 760 { 761 struct md_rdev *rdev; 762 763 rdev_for_each(rdev, mddev) 764 if (rdev->bdev->bd_dev == dev) 765 return rdev; 766 767 return NULL; 768 } 769 770 static struct md_personality *find_pers(int level, char *clevel) 771 { 772 struct md_personality *pers; 773 list_for_each_entry(pers, &pers_list, list) { 774 if (level != LEVEL_NONE && pers->level == level) 775 return pers; 776 if (strcmp(pers->name, clevel)==0) 777 return pers; 778 } 779 return NULL; 780 } 781 782 /* return the offset of the super block in 512byte sectors */ 783 static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) 784 { 785 sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; 786 return MD_NEW_SIZE_SECTORS(num_sectors); 787 } 788 789 static int alloc_disk_sb(struct md_rdev * rdev) 790 { 791 if (rdev->sb_page) 792 MD_BUG(); 793 794 rdev->sb_page = alloc_page(GFP_KERNEL); 795 if (!rdev->sb_page) { 796 printk(KERN_ALERT "md: out of memory.\n"); 797 return -ENOMEM; 798 } 799 800 return 0; 801 } 802 803 static void free_disk_sb(struct md_rdev * rdev) 804 { 805 if (rdev->sb_page) { 806 put_page(rdev->sb_page); 807 rdev->sb_loaded = 0; 808 rdev->sb_page = NULL; 809 rdev->sb_start = 0; 810 rdev->sectors = 0; 811 } 812 if (rdev->bb_page) { 813 put_page(rdev->bb_page); 814 rdev->bb_page = NULL; 815 } 816 } 817 818 819 static void super_written(struct bio *bio, int error) 820 { 821 struct md_rdev *rdev = bio->bi_private; 822 struct mddev *mddev = rdev->mddev; 823 824 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { 825 printk("md: super_written gets error=%d, uptodate=%d\n", 826 error, test_bit(BIO_UPTODATE, &bio->bi_flags)); 827 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); 828 md_error(mddev, rdev); 829 } 830 831 if (atomic_dec_and_test(&mddev->pending_writes)) 832 wake_up(&mddev->sb_wait); 833 bio_put(bio); 834 } 835 836 void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 837 sector_t sector, int size, struct page *page) 838 { 839 /* write first size bytes of page to sector of rdev 840 * Increment mddev->pending_writes before returning 841 * and decrement it on completion, waking up sb_wait 842 * if zero is reached. 843 * If an error occurred, call md_error 844 */ 845 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); 846 847 bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; 848 bio->bi_sector = sector; 849 bio_add_page(bio, page, size, 0); 850 bio->bi_private = rdev; 851 bio->bi_end_io = super_written; 852 853 atomic_inc(&mddev->pending_writes); 854 submit_bio(WRITE_FLUSH_FUA, bio); 855 } 856 857 void md_super_wait(struct mddev *mddev) 858 { 859 /* wait for all superblock writes that were scheduled to complete */ 860 DEFINE_WAIT(wq); 861 for(;;) { 862 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); 863 if (atomic_read(&mddev->pending_writes)==0) 864 break; 865 schedule(); 866 } 867 finish_wait(&mddev->sb_wait, &wq); 868 } 869 870 static void bi_complete(struct bio *bio, int error) 871 { 872 complete((struct completion*)bio->bi_private); 873 } 874 875 int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 876 struct page *page, int rw, bool metadata_op) 877 { 878 struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); 879 struct completion event; 880 int ret; 881 882 rw |= REQ_SYNC; 883 884 bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? 885 rdev->meta_bdev : rdev->bdev; 886 if (metadata_op) 887 bio->bi_sector = sector + rdev->sb_start; 888 else 889 bio->bi_sector = sector + rdev->data_offset; 890 bio_add_page(bio, page, size, 0); 891 init_completion(&event); 892 bio->bi_private = &event; 893 bio->bi_end_io = bi_complete; 894 submit_bio(rw, bio); 895 wait_for_completion(&event); 896 897 ret = test_bit(BIO_UPTODATE, &bio->bi_flags); 898 bio_put(bio); 899 return ret; 900 } 901 EXPORT_SYMBOL_GPL(sync_page_io); 902 903 static int read_disk_sb(struct md_rdev * rdev, int size) 904 { 905 char b[BDEVNAME_SIZE]; 906 if (!rdev->sb_page) { 907 MD_BUG(); 908 return -EINVAL; 909 } 910 if (rdev->sb_loaded) 911 return 0; 912 913 914 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) 915 goto fail; 916 rdev->sb_loaded = 1; 917 return 0; 918 919 fail: 920 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", 921 bdevname(rdev->bdev,b)); 922 return -EINVAL; 923 } 924 925 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 926 { 927 return sb1->set_uuid0 == sb2->set_uuid0 && 928 sb1->set_uuid1 == sb2->set_uuid1 && 929 sb1->set_uuid2 == sb2->set_uuid2 && 930 sb1->set_uuid3 == sb2->set_uuid3; 931 } 932 933 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 934 { 935 int ret; 936 mdp_super_t *tmp1, *tmp2; 937 938 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 939 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 940 941 if (!tmp1 || !tmp2) { 942 ret = 0; 943 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); 944 goto abort; 945 } 946 947 *tmp1 = *sb1; 948 *tmp2 = *sb2; 949 950 /* 951 * nr_disks is not constant 952 */ 953 tmp1->nr_disks = 0; 954 tmp2->nr_disks = 0; 955 956 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); 957 abort: 958 kfree(tmp1); 959 kfree(tmp2); 960 return ret; 961 } 962 963 964 static u32 md_csum_fold(u32 csum) 965 { 966 csum = (csum & 0xffff) + (csum >> 16); 967 return (csum & 0xffff) + (csum >> 16); 968 } 969 970 static unsigned int calc_sb_csum(mdp_super_t * sb) 971 { 972 u64 newcsum = 0; 973 u32 *sb32 = (u32*)sb; 974 int i; 975 unsigned int disk_csum, csum; 976 977 disk_csum = sb->sb_csum; 978 sb->sb_csum = 0; 979 980 for (i = 0; i < MD_SB_BYTES/4 ; i++) 981 newcsum += sb32[i]; 982 csum = (newcsum & 0xffffffff) + (newcsum>>32); 983 984 985 #ifdef CONFIG_ALPHA 986 /* This used to use csum_partial, which was wrong for several 987 * reasons including that different results are returned on 988 * different architectures. It isn't critical that we get exactly 989 * the same return value as before (we always csum_fold before 990 * testing, and that removes any differences). However as we 991 * know that csum_partial always returned a 16bit value on 992 * alphas, do a fold to maximise conformity to previous behaviour. 993 */ 994 sb->sb_csum = md_csum_fold(disk_csum); 995 #else 996 sb->sb_csum = disk_csum; 997 #endif 998 return csum; 999 } 1000 1001 1002 /* 1003 * Handle superblock details. 1004 * We want to be able to handle multiple superblock formats 1005 * so we have a common interface to them all, and an array of 1006 * different handlers. 1007 * We rely on user-space to write the initial superblock, and support 1008 * reading and updating of superblocks. 1009 * Interface methods are: 1010 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) 1011 * loads and validates a superblock on dev. 1012 * if refdev != NULL, compare superblocks on both devices 1013 * Return: 1014 * 0 - dev has a superblock that is compatible with refdev 1015 * 1 - dev has a superblock that is compatible and newer than refdev 1016 * so dev should be used as the refdev in future 1017 * -EINVAL superblock incompatible or invalid 1018 * -othererror e.g. -EIO 1019 * 1020 * int validate_super(struct mddev *mddev, struct md_rdev *dev) 1021 * Verify that dev is acceptable into mddev. 1022 * The first time, mddev->raid_disks will be 0, and data from 1023 * dev should be merged in. Subsequent calls check that dev 1024 * is new enough. Return 0 or -EINVAL 1025 * 1026 * void sync_super(struct mddev *mddev, struct md_rdev *dev) 1027 * Update the superblock for rdev with data in mddev 1028 * This does not write to disc. 1029 * 1030 */ 1031 1032 struct super_type { 1033 char *name; 1034 struct module *owner; 1035 int (*load_super)(struct md_rdev *rdev, struct md_rdev *refdev, 1036 int minor_version); 1037 int (*validate_super)(struct mddev *mddev, struct md_rdev *rdev); 1038 void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); 1039 unsigned long long (*rdev_size_change)(struct md_rdev *rdev, 1040 sector_t num_sectors); 1041 }; 1042 1043 /* 1044 * Check that the given mddev has no bitmap. 1045 * 1046 * This function is called from the run method of all personalities that do not 1047 * support bitmaps. It prints an error message and returns non-zero if mddev 1048 * has a bitmap. Otherwise, it returns 0. 1049 * 1050 */ 1051 int md_check_no_bitmap(struct mddev *mddev) 1052 { 1053 if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) 1054 return 0; 1055 printk(KERN_ERR "%s: bitmaps are not supported for %s\n", 1056 mdname(mddev), mddev->pers->name); 1057 return 1; 1058 } 1059 EXPORT_SYMBOL(md_check_no_bitmap); 1060 1061 /* 1062 * load_super for 0.90.0 1063 */ 1064 static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 1065 { 1066 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1067 mdp_super_t *sb; 1068 int ret; 1069 1070 /* 1071 * Calculate the position of the superblock (512byte sectors), 1072 * it's at the end of the disk. 1073 * 1074 * It also happens to be a multiple of 4Kb. 1075 */ 1076 rdev->sb_start = calc_dev_sboffset(rdev); 1077 1078 ret = read_disk_sb(rdev, MD_SB_BYTES); 1079 if (ret) return ret; 1080 1081 ret = -EINVAL; 1082 1083 bdevname(rdev->bdev, b); 1084 sb = page_address(rdev->sb_page); 1085 1086 if (sb->md_magic != MD_SB_MAGIC) { 1087 printk(KERN_ERR "md: invalid raid superblock magic on %s\n", 1088 b); 1089 goto abort; 1090 } 1091 1092 if (sb->major_version != 0 || 1093 sb->minor_version < 90 || 1094 sb->minor_version > 91) { 1095 printk(KERN_WARNING "Bad version number %d.%d on %s\n", 1096 sb->major_version, sb->minor_version, 1097 b); 1098 goto abort; 1099 } 1100 1101 if (sb->raid_disks <= 0) 1102 goto abort; 1103 1104 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { 1105 printk(KERN_WARNING "md: invalid superblock checksum on %s\n", 1106 b); 1107 goto abort; 1108 } 1109 1110 rdev->preferred_minor = sb->md_minor; 1111 rdev->data_offset = 0; 1112 rdev->sb_size = MD_SB_BYTES; 1113 rdev->badblocks.shift = -1; 1114 1115 if (sb->level == LEVEL_MULTIPATH) 1116 rdev->desc_nr = -1; 1117 else 1118 rdev->desc_nr = sb->this_disk.number; 1119 1120 if (!refdev) { 1121 ret = 1; 1122 } else { 1123 __u64 ev1, ev2; 1124 mdp_super_t *refsb = page_address(refdev->sb_page); 1125 if (!uuid_equal(refsb, sb)) { 1126 printk(KERN_WARNING "md: %s has different UUID to %s\n", 1127 b, bdevname(refdev->bdev,b2)); 1128 goto abort; 1129 } 1130 if (!sb_equal(refsb, sb)) { 1131 printk(KERN_WARNING "md: %s has same UUID" 1132 " but different superblock to %s\n", 1133 b, bdevname(refdev->bdev, b2)); 1134 goto abort; 1135 } 1136 ev1 = md_event(sb); 1137 ev2 = md_event(refsb); 1138 if (ev1 > ev2) 1139 ret = 1; 1140 else 1141 ret = 0; 1142 } 1143 rdev->sectors = rdev->sb_start; 1144 /* Limit to 4TB as metadata cannot record more than that */ 1145 if (rdev->sectors >= (2ULL << 32)) 1146 rdev->sectors = (2ULL << 32) - 2; 1147 1148 if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) 1149 /* "this cannot possibly happen" ... */ 1150 ret = -EINVAL; 1151 1152 abort: 1153 return ret; 1154 } 1155 1156 /* 1157 * validate_super for 0.90.0 1158 */ 1159 static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) 1160 { 1161 mdp_disk_t *desc; 1162 mdp_super_t *sb = page_address(rdev->sb_page); 1163 __u64 ev1 = md_event(sb); 1164 1165 rdev->raid_disk = -1; 1166 clear_bit(Faulty, &rdev->flags); 1167 clear_bit(In_sync, &rdev->flags); 1168 clear_bit(WriteMostly, &rdev->flags); 1169 1170 if (mddev->raid_disks == 0) { 1171 mddev->major_version = 0; 1172 mddev->minor_version = sb->minor_version; 1173 mddev->patch_version = sb->patch_version; 1174 mddev->external = 0; 1175 mddev->chunk_sectors = sb->chunk_size >> 9; 1176 mddev->ctime = sb->ctime; 1177 mddev->utime = sb->utime; 1178 mddev->level = sb->level; 1179 mddev->clevel[0] = 0; 1180 mddev->layout = sb->layout; 1181 mddev->raid_disks = sb->raid_disks; 1182 mddev->dev_sectors = ((sector_t)sb->size) * 2; 1183 mddev->events = ev1; 1184 mddev->bitmap_info.offset = 0; 1185 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 1186 1187 if (mddev->minor_version >= 91) { 1188 mddev->reshape_position = sb->reshape_position; 1189 mddev->delta_disks = sb->delta_disks; 1190 mddev->new_level = sb->new_level; 1191 mddev->new_layout = sb->new_layout; 1192 mddev->new_chunk_sectors = sb->new_chunk >> 9; 1193 } else { 1194 mddev->reshape_position = MaxSector; 1195 mddev->delta_disks = 0; 1196 mddev->new_level = mddev->level; 1197 mddev->new_layout = mddev->layout; 1198 mddev->new_chunk_sectors = mddev->chunk_sectors; 1199 } 1200 1201 if (sb->state & (1<<MD_SB_CLEAN)) 1202 mddev->recovery_cp = MaxSector; 1203 else { 1204 if (sb->events_hi == sb->cp_events_hi && 1205 sb->events_lo == sb->cp_events_lo) { 1206 mddev->recovery_cp = sb->recovery_cp; 1207 } else 1208 mddev->recovery_cp = 0; 1209 } 1210 1211 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 1212 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 1213 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 1214 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 1215 1216 mddev->max_disks = MD_SB_DISKS; 1217 1218 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 1219 mddev->bitmap_info.file == NULL) 1220 mddev->bitmap_info.offset = 1221 mddev->bitmap_info.default_offset; 1222 1223 } else if (mddev->pers == NULL) { 1224 /* Insist on good event counter while assembling, except 1225 * for spares (which don't need an event count) */ 1226 ++ev1; 1227 if (sb->disks[rdev->desc_nr].state & ( 1228 (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) 1229 if (ev1 < mddev->events) 1230 return -EINVAL; 1231 } else if (mddev->bitmap) { 1232 /* if adding to array with a bitmap, then we can accept an 1233 * older device ... but not too old. 1234 */ 1235 if (ev1 < mddev->bitmap->events_cleared) 1236 return 0; 1237 } else { 1238 if (ev1 < mddev->events) 1239 /* just a hot-add of a new device, leave raid_disk at -1 */ 1240 return 0; 1241 } 1242 1243 if (mddev->level != LEVEL_MULTIPATH) { 1244 desc = sb->disks + rdev->desc_nr; 1245 1246 if (desc->state & (1<<MD_DISK_FAULTY)) 1247 set_bit(Faulty, &rdev->flags); 1248 else if (desc->state & (1<<MD_DISK_SYNC) /* && 1249 desc->raid_disk < mddev->raid_disks */) { 1250 set_bit(In_sync, &rdev->flags); 1251 rdev->raid_disk = desc->raid_disk; 1252 } else if (desc->state & (1<<MD_DISK_ACTIVE)) { 1253 /* active but not in sync implies recovery up to 1254 * reshape position. We don't know exactly where 1255 * that is, so set to zero for now */ 1256 if (mddev->minor_version >= 91) { 1257 rdev->recovery_offset = 0; 1258 rdev->raid_disk = desc->raid_disk; 1259 } 1260 } 1261 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 1262 set_bit(WriteMostly, &rdev->flags); 1263 } else /* MULTIPATH are always insync */ 1264 set_bit(In_sync, &rdev->flags); 1265 return 0; 1266 } 1267 1268 /* 1269 * sync_super for 0.90.0 1270 */ 1271 static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) 1272 { 1273 mdp_super_t *sb; 1274 struct md_rdev *rdev2; 1275 int next_spare = mddev->raid_disks; 1276 1277 1278 /* make rdev->sb match mddev data.. 1279 * 1280 * 1/ zero out disks 1281 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 1282 * 3/ any empty disks < next_spare become removed 1283 * 1284 * disks[0] gets initialised to REMOVED because 1285 * we cannot be sure from other fields if it has 1286 * been initialised or not. 1287 */ 1288 int i; 1289 int active=0, working=0,failed=0,spare=0,nr_disks=0; 1290 1291 rdev->sb_size = MD_SB_BYTES; 1292 1293 sb = page_address(rdev->sb_page); 1294 1295 memset(sb, 0, sizeof(*sb)); 1296 1297 sb->md_magic = MD_SB_MAGIC; 1298 sb->major_version = mddev->major_version; 1299 sb->patch_version = mddev->patch_version; 1300 sb->gvalid_words = 0; /* ignored */ 1301 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 1302 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 1303 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 1304 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 1305 1306 sb->ctime = mddev->ctime; 1307 sb->level = mddev->level; 1308 sb->size = mddev->dev_sectors / 2; 1309 sb->raid_disks = mddev->raid_disks; 1310 sb->md_minor = mddev->md_minor; 1311 sb->not_persistent = 0; 1312 sb->utime = mddev->utime; 1313 sb->state = 0; 1314 sb->events_hi = (mddev->events>>32); 1315 sb->events_lo = (u32)mddev->events; 1316 1317 if (mddev->reshape_position == MaxSector) 1318 sb->minor_version = 90; 1319 else { 1320 sb->minor_version = 91; 1321 sb->reshape_position = mddev->reshape_position; 1322 sb->new_level = mddev->new_level; 1323 sb->delta_disks = mddev->delta_disks; 1324 sb->new_layout = mddev->new_layout; 1325 sb->new_chunk = mddev->new_chunk_sectors << 9; 1326 } 1327 mddev->minor_version = sb->minor_version; 1328 if (mddev->in_sync) 1329 { 1330 sb->recovery_cp = mddev->recovery_cp; 1331 sb->cp_events_hi = (mddev->events>>32); 1332 sb->cp_events_lo = (u32)mddev->events; 1333 if (mddev->recovery_cp == MaxSector) 1334 sb->state = (1<< MD_SB_CLEAN); 1335 } else 1336 sb->recovery_cp = 0; 1337 1338 sb->layout = mddev->layout; 1339 sb->chunk_size = mddev->chunk_sectors << 9; 1340 1341 if (mddev->bitmap && mddev->bitmap_info.file == NULL) 1342 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 1343 1344 sb->disks[0].state = (1<<MD_DISK_REMOVED); 1345 rdev_for_each(rdev2, mddev) { 1346 mdp_disk_t *d; 1347 int desc_nr; 1348 int is_active = test_bit(In_sync, &rdev2->flags); 1349 1350 if (rdev2->raid_disk >= 0 && 1351 sb->minor_version >= 91) 1352 /* we have nowhere to store the recovery_offset, 1353 * but if it is not below the reshape_position, 1354 * we can piggy-back on that. 1355 */ 1356 is_active = 1; 1357 if (rdev2->raid_disk < 0 || 1358 test_bit(Faulty, &rdev2->flags)) 1359 is_active = 0; 1360 if (is_active) 1361 desc_nr = rdev2->raid_disk; 1362 else 1363 desc_nr = next_spare++; 1364 rdev2->desc_nr = desc_nr; 1365 d = &sb->disks[rdev2->desc_nr]; 1366 nr_disks++; 1367 d->number = rdev2->desc_nr; 1368 d->major = MAJOR(rdev2->bdev->bd_dev); 1369 d->minor = MINOR(rdev2->bdev->bd_dev); 1370 if (is_active) 1371 d->raid_disk = rdev2->raid_disk; 1372 else 1373 d->raid_disk = rdev2->desc_nr; /* compatibility */ 1374 if (test_bit(Faulty, &rdev2->flags)) 1375 d->state = (1<<MD_DISK_FAULTY); 1376 else if (is_active) { 1377 d->state = (1<<MD_DISK_ACTIVE); 1378 if (test_bit(In_sync, &rdev2->flags)) 1379 d->state |= (1<<MD_DISK_SYNC); 1380 active++; 1381 working++; 1382 } else { 1383 d->state = 0; 1384 spare++; 1385 working++; 1386 } 1387 if (test_bit(WriteMostly, &rdev2->flags)) 1388 d->state |= (1<<MD_DISK_WRITEMOSTLY); 1389 } 1390 /* now set the "removed" and "faulty" bits on any missing devices */ 1391 for (i=0 ; i < mddev->raid_disks ; i++) { 1392 mdp_disk_t *d = &sb->disks[i]; 1393 if (d->state == 0 && d->number == 0) { 1394 d->number = i; 1395 d->raid_disk = i; 1396 d->state = (1<<MD_DISK_REMOVED); 1397 d->state |= (1<<MD_DISK_FAULTY); 1398 failed++; 1399 } 1400 } 1401 sb->nr_disks = nr_disks; 1402 sb->active_disks = active; 1403 sb->working_disks = working; 1404 sb->failed_disks = failed; 1405 sb->spare_disks = spare; 1406 1407 sb->this_disk = sb->disks[rdev->desc_nr]; 1408 sb->sb_csum = calc_sb_csum(sb); 1409 } 1410 1411 /* 1412 * rdev_size_change for 0.90.0 1413 */ 1414 static unsigned long long 1415 super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1416 { 1417 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1418 return 0; /* component must fit device */ 1419 if (rdev->mddev->bitmap_info.offset) 1420 return 0; /* can't move bitmap */ 1421 rdev->sb_start = calc_dev_sboffset(rdev); 1422 if (!num_sectors || num_sectors > rdev->sb_start) 1423 num_sectors = rdev->sb_start; 1424 /* Limit to 4TB as metadata cannot record more than that. 1425 * 4TB == 2^32 KB, or 2*2^32 sectors. 1426 */ 1427 if (num_sectors >= (2ULL << 32)) 1428 num_sectors = (2ULL << 32) - 2; 1429 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1430 rdev->sb_page); 1431 md_super_wait(rdev->mddev); 1432 return num_sectors; 1433 } 1434 1435 1436 /* 1437 * version 1 superblock 1438 */ 1439 1440 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) 1441 { 1442 __le32 disk_csum; 1443 u32 csum; 1444 unsigned long long newcsum; 1445 int size = 256 + le32_to_cpu(sb->max_dev)*2; 1446 __le32 *isuper = (__le32*)sb; 1447 int i; 1448 1449 disk_csum = sb->sb_csum; 1450 sb->sb_csum = 0; 1451 newcsum = 0; 1452 for (i=0; size>=4; size -= 4 ) 1453 newcsum += le32_to_cpu(*isuper++); 1454 1455 if (size == 2) 1456 newcsum += le16_to_cpu(*(__le16*) isuper); 1457 1458 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 1459 sb->sb_csum = disk_csum; 1460 return cpu_to_le32(csum); 1461 } 1462 1463 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, 1464 int acknowledged); 1465 static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) 1466 { 1467 struct mdp_superblock_1 *sb; 1468 int ret; 1469 sector_t sb_start; 1470 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1471 int bmask; 1472 1473 /* 1474 * Calculate the position of the superblock in 512byte sectors. 1475 * It is always aligned to a 4K boundary and 1476 * depeding on minor_version, it can be: 1477 * 0: At least 8K, but less than 12K, from end of device 1478 * 1: At start of device 1479 * 2: 4K from start of device. 1480 */ 1481 switch(minor_version) { 1482 case 0: 1483 sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; 1484 sb_start -= 8*2; 1485 sb_start &= ~(sector_t)(4*2-1); 1486 break; 1487 case 1: 1488 sb_start = 0; 1489 break; 1490 case 2: 1491 sb_start = 8; 1492 break; 1493 default: 1494 return -EINVAL; 1495 } 1496 rdev->sb_start = sb_start; 1497 1498 /* superblock is rarely larger than 1K, but it can be larger, 1499 * and it is safe to read 4k, so we do that 1500 */ 1501 ret = read_disk_sb(rdev, 4096); 1502 if (ret) return ret; 1503 1504 1505 sb = page_address(rdev->sb_page); 1506 1507 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 1508 sb->major_version != cpu_to_le32(1) || 1509 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 1510 le64_to_cpu(sb->super_offset) != rdev->sb_start || 1511 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 1512 return -EINVAL; 1513 1514 if (calc_sb_1_csum(sb) != sb->sb_csum) { 1515 printk("md: invalid superblock checksum on %s\n", 1516 bdevname(rdev->bdev,b)); 1517 return -EINVAL; 1518 } 1519 if (le64_to_cpu(sb->data_size) < 10) { 1520 printk("md: data_size too small on %s\n", 1521 bdevname(rdev->bdev,b)); 1522 return -EINVAL; 1523 } 1524 1525 rdev->preferred_minor = 0xffff; 1526 rdev->data_offset = le64_to_cpu(sb->data_offset); 1527 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); 1528 1529 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 1530 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1531 if (rdev->sb_size & bmask) 1532 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1533 1534 if (minor_version 1535 && rdev->data_offset < sb_start + (rdev->sb_size/512)) 1536 return -EINVAL; 1537 1538 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) 1539 rdev->desc_nr = -1; 1540 else 1541 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1542 1543 if (!rdev->bb_page) { 1544 rdev->bb_page = alloc_page(GFP_KERNEL); 1545 if (!rdev->bb_page) 1546 return -ENOMEM; 1547 } 1548 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && 1549 rdev->badblocks.count == 0) { 1550 /* need to load the bad block list. 1551 * Currently we limit it to one page. 1552 */ 1553 s32 offset; 1554 sector_t bb_sector; 1555 u64 *bbp; 1556 int i; 1557 int sectors = le16_to_cpu(sb->bblog_size); 1558 if (sectors > (PAGE_SIZE / 512)) 1559 return -EINVAL; 1560 offset = le32_to_cpu(sb->bblog_offset); 1561 if (offset == 0) 1562 return -EINVAL; 1563 bb_sector = (long long)offset; 1564 if (!sync_page_io(rdev, bb_sector, sectors << 9, 1565 rdev->bb_page, READ, true)) 1566 return -EIO; 1567 bbp = (u64 *)page_address(rdev->bb_page); 1568 rdev->badblocks.shift = sb->bblog_shift; 1569 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { 1570 u64 bb = le64_to_cpu(*bbp); 1571 int count = bb & (0x3ff); 1572 u64 sector = bb >> 10; 1573 sector <<= sb->bblog_shift; 1574 count <<= sb->bblog_shift; 1575 if (bb + 1 == 0) 1576 break; 1577 if (md_set_badblocks(&rdev->badblocks, 1578 sector, count, 1) == 0) 1579 return -EINVAL; 1580 } 1581 } else if (sb->bblog_offset == 0) 1582 rdev->badblocks.shift = -1; 1583 1584 if (!refdev) { 1585 ret = 1; 1586 } else { 1587 __u64 ev1, ev2; 1588 struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); 1589 1590 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 1591 sb->level != refsb->level || 1592 sb->layout != refsb->layout || 1593 sb->chunksize != refsb->chunksize) { 1594 printk(KERN_WARNING "md: %s has strangely different" 1595 " superblock to %s\n", 1596 bdevname(rdev->bdev,b), 1597 bdevname(refdev->bdev,b2)); 1598 return -EINVAL; 1599 } 1600 ev1 = le64_to_cpu(sb->events); 1601 ev2 = le64_to_cpu(refsb->events); 1602 1603 if (ev1 > ev2) 1604 ret = 1; 1605 else 1606 ret = 0; 1607 } 1608 if (minor_version) 1609 rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - 1610 le64_to_cpu(sb->data_offset); 1611 else 1612 rdev->sectors = rdev->sb_start; 1613 if (rdev->sectors < le64_to_cpu(sb->data_size)) 1614 return -EINVAL; 1615 rdev->sectors = le64_to_cpu(sb->data_size); 1616 if (le64_to_cpu(sb->size) > rdev->sectors) 1617 return -EINVAL; 1618 return ret; 1619 } 1620 1621 static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) 1622 { 1623 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 1624 __u64 ev1 = le64_to_cpu(sb->events); 1625 1626 rdev->raid_disk = -1; 1627 clear_bit(Faulty, &rdev->flags); 1628 clear_bit(In_sync, &rdev->flags); 1629 clear_bit(WriteMostly, &rdev->flags); 1630 1631 if (mddev->raid_disks == 0) { 1632 mddev->major_version = 1; 1633 mddev->patch_version = 0; 1634 mddev->external = 0; 1635 mddev->chunk_sectors = le32_to_cpu(sb->chunksize); 1636 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); 1637 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); 1638 mddev->level = le32_to_cpu(sb->level); 1639 mddev->clevel[0] = 0; 1640 mddev->layout = le32_to_cpu(sb->layout); 1641 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1642 mddev->dev_sectors = le64_to_cpu(sb->size); 1643 mddev->events = ev1; 1644 mddev->bitmap_info.offset = 0; 1645 mddev->bitmap_info.default_offset = 1024 >> 9; 1646 1647 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1648 memcpy(mddev->uuid, sb->set_uuid, 16); 1649 1650 mddev->max_disks = (4096-256)/2; 1651 1652 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1653 mddev->bitmap_info.file == NULL ) 1654 mddev->bitmap_info.offset = 1655 (__s32)le32_to_cpu(sb->bitmap_offset); 1656 1657 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { 1658 mddev->reshape_position = le64_to_cpu(sb->reshape_position); 1659 mddev->delta_disks = le32_to_cpu(sb->delta_disks); 1660 mddev->new_level = le32_to_cpu(sb->new_level); 1661 mddev->new_layout = le32_to_cpu(sb->new_layout); 1662 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); 1663 } else { 1664 mddev->reshape_position = MaxSector; 1665 mddev->delta_disks = 0; 1666 mddev->new_level = mddev->level; 1667 mddev->new_layout = mddev->layout; 1668 mddev->new_chunk_sectors = mddev->chunk_sectors; 1669 } 1670 1671 } else if (mddev->pers == NULL) { 1672 /* Insist of good event counter while assembling, except for 1673 * spares (which don't need an event count) */ 1674 ++ev1; 1675 if (rdev->desc_nr >= 0 && 1676 rdev->desc_nr < le32_to_cpu(sb->max_dev) && 1677 le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) 1678 if (ev1 < mddev->events) 1679 return -EINVAL; 1680 } else if (mddev->bitmap) { 1681 /* If adding to array with a bitmap, then we can accept an 1682 * older device, but not too old. 1683 */ 1684 if (ev1 < mddev->bitmap->events_cleared) 1685 return 0; 1686 } else { 1687 if (ev1 < mddev->events) 1688 /* just a hot-add of a new device, leave raid_disk at -1 */ 1689 return 0; 1690 } 1691 if (mddev->level != LEVEL_MULTIPATH) { 1692 int role; 1693 if (rdev->desc_nr < 0 || 1694 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { 1695 role = 0xffff; 1696 rdev->desc_nr = -1; 1697 } else 1698 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1699 switch(role) { 1700 case 0xffff: /* spare */ 1701 break; 1702 case 0xfffe: /* faulty */ 1703 set_bit(Faulty, &rdev->flags); 1704 break; 1705 default: 1706 if ((le32_to_cpu(sb->feature_map) & 1707 MD_FEATURE_RECOVERY_OFFSET)) 1708 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 1709 else 1710 set_bit(In_sync, &rdev->flags); 1711 rdev->raid_disk = role; 1712 break; 1713 } 1714 if (sb->devflags & WriteMostly1) 1715 set_bit(WriteMostly, &rdev->flags); 1716 if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) 1717 set_bit(Replacement, &rdev->flags); 1718 } else /* MULTIPATH are always insync */ 1719 set_bit(In_sync, &rdev->flags); 1720 1721 return 0; 1722 } 1723 1724 static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) 1725 { 1726 struct mdp_superblock_1 *sb; 1727 struct md_rdev *rdev2; 1728 int max_dev, i; 1729 /* make rdev->sb match mddev and rdev data. */ 1730 1731 sb = page_address(rdev->sb_page); 1732 1733 sb->feature_map = 0; 1734 sb->pad0 = 0; 1735 sb->recovery_offset = cpu_to_le64(0); 1736 memset(sb->pad1, 0, sizeof(sb->pad1)); 1737 memset(sb->pad3, 0, sizeof(sb->pad3)); 1738 1739 sb->utime = cpu_to_le64((__u64)mddev->utime); 1740 sb->events = cpu_to_le64(mddev->events); 1741 if (mddev->in_sync) 1742 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1743 else 1744 sb->resync_offset = cpu_to_le64(0); 1745 1746 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); 1747 1748 sb->raid_disks = cpu_to_le32(mddev->raid_disks); 1749 sb->size = cpu_to_le64(mddev->dev_sectors); 1750 sb->chunksize = cpu_to_le32(mddev->chunk_sectors); 1751 sb->level = cpu_to_le32(mddev->level); 1752 sb->layout = cpu_to_le32(mddev->layout); 1753 1754 if (test_bit(WriteMostly, &rdev->flags)) 1755 sb->devflags |= WriteMostly1; 1756 else 1757 sb->devflags &= ~WriteMostly1; 1758 1759 if (mddev->bitmap && mddev->bitmap_info.file == NULL) { 1760 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); 1761 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1762 } 1763 1764 if (rdev->raid_disk >= 0 && 1765 !test_bit(In_sync, &rdev->flags)) { 1766 sb->feature_map |= 1767 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); 1768 sb->recovery_offset = 1769 cpu_to_le64(rdev->recovery_offset); 1770 } 1771 if (test_bit(Replacement, &rdev->flags)) 1772 sb->feature_map |= 1773 cpu_to_le32(MD_FEATURE_REPLACEMENT); 1774 1775 if (mddev->reshape_position != MaxSector) { 1776 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); 1777 sb->reshape_position = cpu_to_le64(mddev->reshape_position); 1778 sb->new_layout = cpu_to_le32(mddev->new_layout); 1779 sb->delta_disks = cpu_to_le32(mddev->delta_disks); 1780 sb->new_level = cpu_to_le32(mddev->new_level); 1781 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); 1782 } 1783 1784 if (rdev->badblocks.count == 0) 1785 /* Nothing to do for bad blocks*/ ; 1786 else if (sb->bblog_offset == 0) 1787 /* Cannot record bad blocks on this device */ 1788 md_error(mddev, rdev); 1789 else { 1790 struct badblocks *bb = &rdev->badblocks; 1791 u64 *bbp = (u64 *)page_address(rdev->bb_page); 1792 u64 *p = bb->page; 1793 sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); 1794 if (bb->changed) { 1795 unsigned seq; 1796 1797 retry: 1798 seq = read_seqbegin(&bb->lock); 1799 1800 memset(bbp, 0xff, PAGE_SIZE); 1801 1802 for (i = 0 ; i < bb->count ; i++) { 1803 u64 internal_bb = *p++; 1804 u64 store_bb = ((BB_OFFSET(internal_bb) << 10) 1805 | BB_LEN(internal_bb)); 1806 *bbp++ = cpu_to_le64(store_bb); 1807 } 1808 bb->changed = 0; 1809 if (read_seqretry(&bb->lock, seq)) 1810 goto retry; 1811 1812 bb->sector = (rdev->sb_start + 1813 (int)le32_to_cpu(sb->bblog_offset)); 1814 bb->size = le16_to_cpu(sb->bblog_size); 1815 } 1816 } 1817 1818 max_dev = 0; 1819 rdev_for_each(rdev2, mddev) 1820 if (rdev2->desc_nr+1 > max_dev) 1821 max_dev = rdev2->desc_nr+1; 1822 1823 if (max_dev > le32_to_cpu(sb->max_dev)) { 1824 int bmask; 1825 sb->max_dev = cpu_to_le32(max_dev); 1826 rdev->sb_size = max_dev * 2 + 256; 1827 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1828 if (rdev->sb_size & bmask) 1829 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1830 } else 1831 max_dev = le32_to_cpu(sb->max_dev); 1832 1833 for (i=0; i<max_dev;i++) 1834 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1835 1836 rdev_for_each(rdev2, mddev) { 1837 i = rdev2->desc_nr; 1838 if (test_bit(Faulty, &rdev2->flags)) 1839 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1840 else if (test_bit(In_sync, &rdev2->flags)) 1841 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1842 else if (rdev2->raid_disk >= 0) 1843 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1844 else 1845 sb->dev_roles[i] = cpu_to_le16(0xffff); 1846 } 1847 1848 sb->sb_csum = calc_sb_1_csum(sb); 1849 } 1850 1851 static unsigned long long 1852 super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) 1853 { 1854 struct mdp_superblock_1 *sb; 1855 sector_t max_sectors; 1856 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1857 return 0; /* component must fit device */ 1858 if (rdev->sb_start < rdev->data_offset) { 1859 /* minor versions 1 and 2; superblock before data */ 1860 max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; 1861 max_sectors -= rdev->data_offset; 1862 if (!num_sectors || num_sectors > max_sectors) 1863 num_sectors = max_sectors; 1864 } else if (rdev->mddev->bitmap_info.offset) { 1865 /* minor version 0 with bitmap we can't move */ 1866 return 0; 1867 } else { 1868 /* minor version 0; superblock after data */ 1869 sector_t sb_start; 1870 sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; 1871 sb_start &= ~(sector_t)(4*2 - 1); 1872 max_sectors = rdev->sectors + sb_start - rdev->sb_start; 1873 if (!num_sectors || num_sectors > max_sectors) 1874 num_sectors = max_sectors; 1875 rdev->sb_start = sb_start; 1876 } 1877 sb = page_address(rdev->sb_page); 1878 sb->data_size = cpu_to_le64(num_sectors); 1879 sb->super_offset = rdev->sb_start; 1880 sb->sb_csum = calc_sb_1_csum(sb); 1881 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1882 rdev->sb_page); 1883 md_super_wait(rdev->mddev); 1884 return num_sectors; 1885 } 1886 1887 static struct super_type super_types[] = { 1888 [0] = { 1889 .name = "0.90.0", 1890 .owner = THIS_MODULE, 1891 .load_super = super_90_load, 1892 .validate_super = super_90_validate, 1893 .sync_super = super_90_sync, 1894 .rdev_size_change = super_90_rdev_size_change, 1895 }, 1896 [1] = { 1897 .name = "md-1", 1898 .owner = THIS_MODULE, 1899 .load_super = super_1_load, 1900 .validate_super = super_1_validate, 1901 .sync_super = super_1_sync, 1902 .rdev_size_change = super_1_rdev_size_change, 1903 }, 1904 }; 1905 1906 static void sync_super(struct mddev *mddev, struct md_rdev *rdev) 1907 { 1908 if (mddev->sync_super) { 1909 mddev->sync_super(mddev, rdev); 1910 return; 1911 } 1912 1913 BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); 1914 1915 super_types[mddev->major_version].sync_super(mddev, rdev); 1916 } 1917 1918 static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) 1919 { 1920 struct md_rdev *rdev, *rdev2; 1921 1922 rcu_read_lock(); 1923 rdev_for_each_rcu(rdev, mddev1) 1924 rdev_for_each_rcu(rdev2, mddev2) 1925 if (rdev->bdev->bd_contains == 1926 rdev2->bdev->bd_contains) { 1927 rcu_read_unlock(); 1928 return 1; 1929 } 1930 rcu_read_unlock(); 1931 return 0; 1932 } 1933 1934 static LIST_HEAD(pending_raid_disks); 1935 1936 /* 1937 * Try to register data integrity profile for an mddev 1938 * 1939 * This is called when an array is started and after a disk has been kicked 1940 * from the array. It only succeeds if all working and active component devices 1941 * are integrity capable with matching profiles. 1942 */ 1943 int md_integrity_register(struct mddev *mddev) 1944 { 1945 struct md_rdev *rdev, *reference = NULL; 1946 1947 if (list_empty(&mddev->disks)) 1948 return 0; /* nothing to do */ 1949 if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) 1950 return 0; /* shouldn't register, or already is */ 1951 rdev_for_each(rdev, mddev) { 1952 /* skip spares and non-functional disks */ 1953 if (test_bit(Faulty, &rdev->flags)) 1954 continue; 1955 if (rdev->raid_disk < 0) 1956 continue; 1957 if (!reference) { 1958 /* Use the first rdev as the reference */ 1959 reference = rdev; 1960 continue; 1961 } 1962 /* does this rdev's profile match the reference profile? */ 1963 if (blk_integrity_compare(reference->bdev->bd_disk, 1964 rdev->bdev->bd_disk) < 0) 1965 return -EINVAL; 1966 } 1967 if (!reference || !bdev_get_integrity(reference->bdev)) 1968 return 0; 1969 /* 1970 * All component devices are integrity capable and have matching 1971 * profiles, register the common profile for the md device. 1972 */ 1973 if (blk_integrity_register(mddev->gendisk, 1974 bdev_get_integrity(reference->bdev)) != 0) { 1975 printk(KERN_ERR "md: failed to register integrity for %s\n", 1976 mdname(mddev)); 1977 return -EINVAL; 1978 } 1979 printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); 1980 if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { 1981 printk(KERN_ERR "md: failed to create integrity pool for %s\n", 1982 mdname(mddev)); 1983 return -EINVAL; 1984 } 1985 return 0; 1986 } 1987 EXPORT_SYMBOL(md_integrity_register); 1988 1989 /* Disable data integrity if non-capable/non-matching disk is being added */ 1990 void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) 1991 { 1992 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); 1993 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); 1994 1995 if (!bi_mddev) /* nothing to do */ 1996 return; 1997 if (rdev->raid_disk < 0) /* skip spares */ 1998 return; 1999 if (bi_rdev && blk_integrity_compare(mddev->gendisk, 2000 rdev->bdev->bd_disk) >= 0) 2001 return; 2002 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); 2003 blk_integrity_unregister(mddev->gendisk); 2004 } 2005 EXPORT_SYMBOL(md_integrity_add_rdev); 2006 2007 static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev) 2008 { 2009 char b[BDEVNAME_SIZE]; 2010 struct kobject *ko; 2011 char *s; 2012 int err; 2013 2014 if (rdev->mddev) { 2015 MD_BUG(); 2016 return -EINVAL; 2017 } 2018 2019 /* prevent duplicates */ 2020 if (find_rdev(mddev, rdev->bdev->bd_dev)) 2021 return -EEXIST; 2022 2023 /* make sure rdev->sectors exceeds mddev->dev_sectors */ 2024 if (rdev->sectors && (mddev->dev_sectors == 0 || 2025 rdev->sectors < mddev->dev_sectors)) { 2026 if (mddev->pers) { 2027 /* Cannot change size, so fail 2028 * If mddev->level <= 0, then we don't care 2029 * about aligning sizes (e.g. linear) 2030 */ 2031 if (mddev->level > 0) 2032 return -ENOSPC; 2033 } else 2034 mddev->dev_sectors = rdev->sectors; 2035 } 2036 2037 /* Verify rdev->desc_nr is unique. 2038 * If it is -1, assign a free number, else 2039 * check number is not in use 2040 */ 2041 if (rdev->desc_nr < 0) { 2042 int choice = 0; 2043 if (mddev->pers) choice = mddev->raid_disks; 2044 while (find_rdev_nr(mddev, choice)) 2045 choice++; 2046 rdev->desc_nr = choice; 2047 } else { 2048 if (find_rdev_nr(mddev, rdev->desc_nr)) 2049 return -EBUSY; 2050 } 2051 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { 2052 printk(KERN_WARNING "md: %s: array is limited to %d devices\n", 2053 mdname(mddev), mddev->max_disks); 2054 return -EBUSY; 2055 } 2056 bdevname(rdev->bdev,b); 2057 while ( (s=strchr(b, '/')) != NULL) 2058 *s = '!'; 2059 2060 rdev->mddev = mddev; 2061 printk(KERN_INFO "md: bind<%s>\n", b); 2062 2063 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) 2064 goto fail; 2065 2066 ko = &part_to_dev(rdev->bdev->bd_part)->kobj; 2067 if (sysfs_create_link(&rdev->kobj, ko, "block")) 2068 /* failure here is OK */; 2069 rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); 2070 2071 list_add_rcu(&rdev->same_set, &mddev->disks); 2072 bd_link_disk_holder(rdev->bdev, mddev->gendisk); 2073 2074 /* May as well allow recovery to be retried once */ 2075 mddev->recovery_disabled++; 2076 2077 return 0; 2078 2079 fail: 2080 printk(KERN_WARNING "md: failed to register dev-%s for %s\n", 2081 b, mdname(mddev)); 2082 return err; 2083 } 2084 2085 static void md_delayed_delete(struct work_struct *ws) 2086 { 2087 struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); 2088 kobject_del(&rdev->kobj); 2089 kobject_put(&rdev->kobj); 2090 } 2091 2092 static void unbind_rdev_from_array(struct md_rdev * rdev) 2093 { 2094 char b[BDEVNAME_SIZE]; 2095 if (!rdev->mddev) { 2096 MD_BUG(); 2097 return; 2098 } 2099 bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); 2100 list_del_rcu(&rdev->same_set); 2101 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); 2102 rdev->mddev = NULL; 2103 sysfs_remove_link(&rdev->kobj, "block"); 2104 sysfs_put(rdev->sysfs_state); 2105 rdev->sysfs_state = NULL; 2106 kfree(rdev->badblocks.page); 2107 rdev->badblocks.count = 0; 2108 rdev->badblocks.page = NULL; 2109 /* We need to delay this, otherwise we can deadlock when 2110 * writing to 'remove' to "dev/state". We also need 2111 * to delay it due to rcu usage. 2112 */ 2113 synchronize_rcu(); 2114 INIT_WORK(&rdev->del_work, md_delayed_delete); 2115 kobject_get(&rdev->kobj); 2116 queue_work(md_misc_wq, &rdev->del_work); 2117 } 2118 2119 /* 2120 * prevent the device from being mounted, repartitioned or 2121 * otherwise reused by a RAID array (or any other kernel 2122 * subsystem), by bd_claiming the device. 2123 */ 2124 static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) 2125 { 2126 int err = 0; 2127 struct block_device *bdev; 2128 char b[BDEVNAME_SIZE]; 2129 2130 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, 2131 shared ? (struct md_rdev *)lock_rdev : rdev); 2132 if (IS_ERR(bdev)) { 2133 printk(KERN_ERR "md: could not open %s.\n", 2134 __bdevname(dev, b)); 2135 return PTR_ERR(bdev); 2136 } 2137 rdev->bdev = bdev; 2138 return err; 2139 } 2140 2141 static void unlock_rdev(struct md_rdev *rdev) 2142 { 2143 struct block_device *bdev = rdev->bdev; 2144 rdev->bdev = NULL; 2145 if (!bdev) 2146 MD_BUG(); 2147 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 2148 } 2149 2150 void md_autodetect_dev(dev_t dev); 2151 2152 static void export_rdev(struct md_rdev * rdev) 2153 { 2154 char b[BDEVNAME_SIZE]; 2155 printk(KERN_INFO "md: export_rdev(%s)\n", 2156 bdevname(rdev->bdev,b)); 2157 if (rdev->mddev) 2158 MD_BUG(); 2159 free_disk_sb(rdev); 2160 #ifndef MODULE 2161 if (test_bit(AutoDetected, &rdev->flags)) 2162 md_autodetect_dev(rdev->bdev->bd_dev); 2163 #endif 2164 unlock_rdev(rdev); 2165 kobject_put(&rdev->kobj); 2166 } 2167 2168 static void kick_rdev_from_array(struct md_rdev * rdev) 2169 { 2170 unbind_rdev_from_array(rdev); 2171 export_rdev(rdev); 2172 } 2173 2174 static void export_array(struct mddev *mddev) 2175 { 2176 struct md_rdev *rdev, *tmp; 2177 2178 rdev_for_each_safe(rdev, tmp, mddev) { 2179 if (!rdev->mddev) { 2180 MD_BUG(); 2181 continue; 2182 } 2183 kick_rdev_from_array(rdev); 2184 } 2185 if (!list_empty(&mddev->disks)) 2186 MD_BUG(); 2187 mddev->raid_disks = 0; 2188 mddev->major_version = 0; 2189 } 2190 2191 static void print_desc(mdp_disk_t *desc) 2192 { 2193 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, 2194 desc->major,desc->minor,desc->raid_disk,desc->state); 2195 } 2196 2197 static void print_sb_90(mdp_super_t *sb) 2198 { 2199 int i; 2200 2201 printk(KERN_INFO 2202 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", 2203 sb->major_version, sb->minor_version, sb->patch_version, 2204 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, 2205 sb->ctime); 2206 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", 2207 sb->level, sb->size, sb->nr_disks, sb->raid_disks, 2208 sb->md_minor, sb->layout, sb->chunk_size); 2209 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" 2210 " FD:%d SD:%d CSUM:%08x E:%08lx\n", 2211 sb->utime, sb->state, sb->active_disks, sb->working_disks, 2212 sb->failed_disks, sb->spare_disks, 2213 sb->sb_csum, (unsigned long)sb->events_lo); 2214 2215 printk(KERN_INFO); 2216 for (i = 0; i < MD_SB_DISKS; i++) { 2217 mdp_disk_t *desc; 2218 2219 desc = sb->disks + i; 2220 if (desc->number || desc->major || desc->minor || 2221 desc->raid_disk || (desc->state && (desc->state != 4))) { 2222 printk(" D %2d: ", i); 2223 print_desc(desc); 2224 } 2225 } 2226 printk(KERN_INFO "md: THIS: "); 2227 print_desc(&sb->this_disk); 2228 } 2229 2230 static void print_sb_1(struct mdp_superblock_1 *sb) 2231 { 2232 __u8 *uuid; 2233 2234 uuid = sb->set_uuid; 2235 printk(KERN_INFO 2236 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" 2237 "md: Name: \"%s\" CT:%llu\n", 2238 le32_to_cpu(sb->major_version), 2239 le32_to_cpu(sb->feature_map), 2240 uuid, 2241 sb->set_name, 2242 (unsigned long long)le64_to_cpu(sb->ctime) 2243 & MD_SUPERBLOCK_1_TIME_SEC_MASK); 2244 2245 uuid = sb->device_uuid; 2246 printk(KERN_INFO 2247 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" 2248 " RO:%llu\n" 2249 "md: Dev:%08x UUID: %pU\n" 2250 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" 2251 "md: (MaxDev:%u) \n", 2252 le32_to_cpu(sb->level), 2253 (unsigned long long)le64_to_cpu(sb->size), 2254 le32_to_cpu(sb->raid_disks), 2255 le32_to_cpu(sb->layout), 2256 le32_to_cpu(sb->chunksize), 2257 (unsigned long long)le64_to_cpu(sb->data_offset), 2258 (unsigned long long)le64_to_cpu(sb->data_size), 2259 (unsigned long long)le64_to_cpu(sb->super_offset), 2260 (unsigned long long)le64_to_cpu(sb->recovery_offset), 2261 le32_to_cpu(sb->dev_number), 2262 uuid, 2263 sb->devflags, 2264 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, 2265 (unsigned long long)le64_to_cpu(sb->events), 2266 (unsigned long long)le64_to_cpu(sb->resync_offset), 2267 le32_to_cpu(sb->sb_csum), 2268 le32_to_cpu(sb->max_dev) 2269 ); 2270 } 2271 2272 static void print_rdev(struct md_rdev *rdev, int major_version) 2273 { 2274 char b[BDEVNAME_SIZE]; 2275 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", 2276 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, 2277 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), 2278 rdev->desc_nr); 2279 if (rdev->sb_loaded) { 2280 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); 2281 switch (major_version) { 2282 case 0: 2283 print_sb_90(page_address(rdev->sb_page)); 2284 break; 2285 case 1: 2286 print_sb_1(page_address(rdev->sb_page)); 2287 break; 2288 } 2289 } else 2290 printk(KERN_INFO "md: no rdev superblock!\n"); 2291 } 2292 2293 static void md_print_devices(void) 2294 { 2295 struct list_head *tmp; 2296 struct md_rdev *rdev; 2297 struct mddev *mddev; 2298 char b[BDEVNAME_SIZE]; 2299 2300 printk("\n"); 2301 printk("md: **********************************\n"); 2302 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); 2303 printk("md: **********************************\n"); 2304 for_each_mddev(mddev, tmp) { 2305 2306 if (mddev->bitmap) 2307 bitmap_print_sb(mddev->bitmap); 2308 else 2309 printk("%s: ", mdname(mddev)); 2310 rdev_for_each(rdev, mddev) 2311 printk("<%s>", bdevname(rdev->bdev,b)); 2312 printk("\n"); 2313 2314 rdev_for_each(rdev, mddev) 2315 print_rdev(rdev, mddev->major_version); 2316 } 2317 printk("md: **********************************\n"); 2318 printk("\n"); 2319 } 2320 2321 2322 static void sync_sbs(struct mddev * mddev, int nospares) 2323 { 2324 /* Update each superblock (in-memory image), but 2325 * if we are allowed to, skip spares which already 2326 * have the right event counter, or have one earlier 2327 * (which would mean they aren't being marked as dirty 2328 * with the rest of the array) 2329 */ 2330 struct md_rdev *rdev; 2331 rdev_for_each(rdev, mddev) { 2332 if (rdev->sb_events == mddev->events || 2333 (nospares && 2334 rdev->raid_disk < 0 && 2335 rdev->sb_events+1 == mddev->events)) { 2336 /* Don't update this superblock */ 2337 rdev->sb_loaded = 2; 2338 } else { 2339 sync_super(mddev, rdev); 2340 rdev->sb_loaded = 1; 2341 } 2342 } 2343 } 2344 2345 static void md_update_sb(struct mddev * mddev, int force_change) 2346 { 2347 struct md_rdev *rdev; 2348 int sync_req; 2349 int nospares = 0; 2350 int any_badblocks_changed = 0; 2351 2352 repeat: 2353 /* First make sure individual recovery_offsets are correct */ 2354 rdev_for_each(rdev, mddev) { 2355 if (rdev->raid_disk >= 0 && 2356 mddev->delta_disks >= 0 && 2357 !test_bit(In_sync, &rdev->flags) && 2358 mddev->curr_resync_completed > rdev->recovery_offset) 2359 rdev->recovery_offset = mddev->curr_resync_completed; 2360 2361 } 2362 if (!mddev->persistent) { 2363 clear_bit(MD_CHANGE_CLEAN, &mddev->flags); 2364 clear_bit(MD_CHANGE_DEVS, &mddev->flags); 2365 if (!mddev->external) { 2366 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2367 rdev_for_each(rdev, mddev) { 2368 if (rdev->badblocks.changed) { 2369 rdev->badblocks.changed = 0; 2370 md_ack_all_badblocks(&rdev->badblocks); 2371 md_error(mddev, rdev); 2372 } 2373 clear_bit(Blocked, &rdev->flags); 2374 clear_bit(BlockedBadBlocks, &rdev->flags); 2375 wake_up(&rdev->blocked_wait); 2376 } 2377 } 2378 wake_up(&mddev->sb_wait); 2379 return; 2380 } 2381 2382 spin_lock_irq(&mddev->write_lock); 2383 2384 mddev->utime = get_seconds(); 2385 2386 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) 2387 force_change = 1; 2388 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) 2389 /* just a clean<-> dirty transition, possibly leave spares alone, 2390 * though if events isn't the right even/odd, we will have to do 2391 * spares after all 2392 */ 2393 nospares = 1; 2394 if (force_change) 2395 nospares = 0; 2396 if (mddev->degraded) 2397 /* If the array is degraded, then skipping spares is both 2398 * dangerous and fairly pointless. 2399 * Dangerous because a device that was removed from the array 2400 * might have a event_count that still looks up-to-date, 2401 * so it can be re-added without a resync. 2402 * Pointless because if there are any spares to skip, 2403 * then a recovery will happen and soon that array won't 2404 * be degraded any more and the spare can go back to sleep then. 2405 */ 2406 nospares = 0; 2407 2408 sync_req = mddev->in_sync; 2409 2410 /* If this is just a dirty<->clean transition, and the array is clean 2411 * and 'events' is odd, we can roll back to the previous clean state */ 2412 if (nospares 2413 && (mddev->in_sync && mddev->recovery_cp == MaxSector) 2414 && mddev->can_decrease_events 2415 && mddev->events != 1) { 2416 mddev->events--; 2417 mddev->can_decrease_events = 0; 2418 } else { 2419 /* otherwise we have to go forward and ... */ 2420 mddev->events ++; 2421 mddev->can_decrease_events = nospares; 2422 } 2423 2424 if (!mddev->events) { 2425 /* 2426 * oops, this 64-bit counter should never wrap. 2427 * Either we are in around ~1 trillion A.C., assuming 2428 * 1 reboot per second, or we have a bug: 2429 */ 2430 MD_BUG(); 2431 mddev->events --; 2432 } 2433 2434 rdev_for_each(rdev, mddev) { 2435 if (rdev->badblocks.changed) 2436 any_badblocks_changed++; 2437 if (test_bit(Faulty, &rdev->flags)) 2438 set_bit(FaultRecorded, &rdev->flags); 2439 } 2440 2441 sync_sbs(mddev, nospares); 2442 spin_unlock_irq(&mddev->write_lock); 2443 2444 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", 2445 mdname(mddev), mddev->in_sync); 2446 2447 bitmap_update_sb(mddev->bitmap); 2448 rdev_for_each(rdev, mddev) { 2449 char b[BDEVNAME_SIZE]; 2450 2451 if (rdev->sb_loaded != 1) 2452 continue; /* no noise on spare devices */ 2453 2454 if (!test_bit(Faulty, &rdev->flags) && 2455 rdev->saved_raid_disk == -1) { 2456 md_super_write(mddev,rdev, 2457 rdev->sb_start, rdev->sb_size, 2458 rdev->sb_page); 2459 pr_debug("md: (write) %s's sb offset: %llu\n", 2460 bdevname(rdev->bdev, b), 2461 (unsigned long long)rdev->sb_start); 2462 rdev->sb_events = mddev->events; 2463 if (rdev->badblocks.size) { 2464 md_super_write(mddev, rdev, 2465 rdev->badblocks.sector, 2466 rdev->badblocks.size << 9, 2467 rdev->bb_page); 2468 rdev->badblocks.size = 0; 2469 } 2470 2471 } else if (test_bit(Faulty, &rdev->flags)) 2472 pr_debug("md: %s (skipping faulty)\n", 2473 bdevname(rdev->bdev, b)); 2474 else 2475 pr_debug("(skipping incremental s/r "); 2476 2477 if (mddev->level == LEVEL_MULTIPATH) 2478 /* only need to write one superblock... */ 2479 break; 2480 } 2481 md_super_wait(mddev); 2482 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ 2483 2484 spin_lock_irq(&mddev->write_lock); 2485 if (mddev->in_sync != sync_req || 2486 test_bit(MD_CHANGE_DEVS, &mddev->flags)) { 2487 /* have to write it out again */ 2488 spin_unlock_irq(&mddev->write_lock); 2489 goto repeat; 2490 } 2491 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2492 spin_unlock_irq(&mddev->write_lock); 2493 wake_up(&mddev->sb_wait); 2494 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 2495 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 2496 2497 rdev_for_each(rdev, mddev) { 2498 if (test_and_clear_bit(FaultRecorded, &rdev->flags)) 2499 clear_bit(Blocked, &rdev->flags); 2500 2501 if (any_badblocks_changed) 2502 md_ack_all_badblocks(&rdev->badblocks); 2503 clear_bit(BlockedBadBlocks, &rdev->flags); 2504 wake_up(&rdev->blocked_wait); 2505 } 2506 } 2507 2508 /* words written to sysfs files may, or may not, be \n terminated. 2509 * We want to accept with case. For this we use cmd_match. 2510 */ 2511 static int cmd_match(const char *cmd, const char *str) 2512 { 2513 /* See if cmd, written into a sysfs file, matches 2514 * str. They must either be the same, or cmd can 2515 * have a trailing newline 2516 */ 2517 while (*cmd && *str && *cmd == *str) { 2518 cmd++; 2519 str++; 2520 } 2521 if (*cmd == '\n') 2522 cmd++; 2523 if (*str || *cmd) 2524 return 0; 2525 return 1; 2526 } 2527 2528 struct rdev_sysfs_entry { 2529 struct attribute attr; 2530 ssize_t (*show)(struct md_rdev *, char *); 2531 ssize_t (*store)(struct md_rdev *, const char *, size_t); 2532 }; 2533 2534 static ssize_t 2535 state_show(struct md_rdev *rdev, char *page) 2536 { 2537 char *sep = ""; 2538 size_t len = 0; 2539 2540 if (test_bit(Faulty, &rdev->flags) || 2541 rdev->badblocks.unacked_exist) { 2542 len+= sprintf(page+len, "%sfaulty",sep); 2543 sep = ","; 2544 } 2545 if (test_bit(In_sync, &rdev->flags)) { 2546 len += sprintf(page+len, "%sin_sync",sep); 2547 sep = ","; 2548 } 2549 if (test_bit(WriteMostly, &rdev->flags)) { 2550 len += sprintf(page+len, "%swrite_mostly",sep); 2551 sep = ","; 2552 } 2553 if (test_bit(Blocked, &rdev->flags) || 2554 (rdev->badblocks.unacked_exist 2555 && !test_bit(Faulty, &rdev->flags))) { 2556 len += sprintf(page+len, "%sblocked", sep); 2557 sep = ","; 2558 } 2559 if (!test_bit(Faulty, &rdev->flags) && 2560 !test_bit(In_sync, &rdev->flags)) { 2561 len += sprintf(page+len, "%sspare", sep); 2562 sep = ","; 2563 } 2564 if (test_bit(WriteErrorSeen, &rdev->flags)) { 2565 len += sprintf(page+len, "%swrite_error", sep); 2566 sep = ","; 2567 } 2568 if (test_bit(WantReplacement, &rdev->flags)) { 2569 len += sprintf(page+len, "%swant_replacement", sep); 2570 sep = ","; 2571 } 2572 if (test_bit(Replacement, &rdev->flags)) { 2573 len += sprintf(page+len, "%sreplacement", sep); 2574 sep = ","; 2575 } 2576 2577 return len+sprintf(page+len, "\n"); 2578 } 2579 2580 static ssize_t 2581 state_store(struct md_rdev *rdev, const char *buf, size_t len) 2582 { 2583 /* can write 2584 * faulty - simulates an error 2585 * remove - disconnects the device 2586 * writemostly - sets write_mostly 2587 * -writemostly - clears write_mostly 2588 * blocked - sets the Blocked flags 2589 * -blocked - clears the Blocked and possibly simulates an error 2590 * insync - sets Insync providing device isn't active 2591 * write_error - sets WriteErrorSeen 2592 * -write_error - clears WriteErrorSeen 2593 */ 2594 int err = -EINVAL; 2595 if (cmd_match(buf, "faulty") && rdev->mddev->pers) { 2596 md_error(rdev->mddev, rdev); 2597 if (test_bit(Faulty, &rdev->flags)) 2598 err = 0; 2599 else 2600 err = -EBUSY; 2601 } else if (cmd_match(buf, "remove")) { 2602 if (rdev->raid_disk >= 0) 2603 err = -EBUSY; 2604 else { 2605 struct mddev *mddev = rdev->mddev; 2606 kick_rdev_from_array(rdev); 2607 if (mddev->pers) 2608 md_update_sb(mddev, 1); 2609 md_new_event(mddev); 2610 err = 0; 2611 } 2612 } else if (cmd_match(buf, "writemostly")) { 2613 set_bit(WriteMostly, &rdev->flags); 2614 err = 0; 2615 } else if (cmd_match(buf, "-writemostly")) { 2616 clear_bit(WriteMostly, &rdev->flags); 2617 err = 0; 2618 } else if (cmd_match(buf, "blocked")) { 2619 set_bit(Blocked, &rdev->flags); 2620 err = 0; 2621 } else if (cmd_match(buf, "-blocked")) { 2622 if (!test_bit(Faulty, &rdev->flags) && 2623 rdev->badblocks.unacked_exist) { 2624 /* metadata handler doesn't understand badblocks, 2625 * so we need to fail the device 2626 */ 2627 md_error(rdev->mddev, rdev); 2628 } 2629 clear_bit(Blocked, &rdev->flags); 2630 clear_bit(BlockedBadBlocks, &rdev->flags); 2631 wake_up(&rdev->blocked_wait); 2632 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2633 md_wakeup_thread(rdev->mddev->thread); 2634 2635 err = 0; 2636 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { 2637 set_bit(In_sync, &rdev->flags); 2638 err = 0; 2639 } else if (cmd_match(buf, "write_error")) { 2640 set_bit(WriteErrorSeen, &rdev->flags); 2641 err = 0; 2642 } else if (cmd_match(buf, "-write_error")) { 2643 clear_bit(WriteErrorSeen, &rdev->flags); 2644 err = 0; 2645 } else if (cmd_match(buf, "want_replacement")) { 2646 /* Any non-spare device that is not a replacement can 2647 * become want_replacement at any time, but we then need to 2648 * check if recovery is needed. 2649 */ 2650 if (rdev->raid_disk >= 0 && 2651 !test_bit(Replacement, &rdev->flags)) 2652 set_bit(WantReplacement, &rdev->flags); 2653 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2654 md_wakeup_thread(rdev->mddev->thread); 2655 err = 0; 2656 } else if (cmd_match(buf, "-want_replacement")) { 2657 /* Clearing 'want_replacement' is always allowed. 2658 * Once replacements starts it is too late though. 2659 */ 2660 err = 0; 2661 clear_bit(WantReplacement, &rdev->flags); 2662 } else if (cmd_match(buf, "replacement")) { 2663 /* Can only set a device as a replacement when array has not 2664 * yet been started. Once running, replacement is automatic 2665 * from spares, or by assigning 'slot'. 2666 */ 2667 if (rdev->mddev->pers) 2668 err = -EBUSY; 2669 else { 2670 set_bit(Replacement, &rdev->flags); 2671 err = 0; 2672 } 2673 } else if (cmd_match(buf, "-replacement")) { 2674 /* Similarly, can only clear Replacement before start */ 2675 if (rdev->mddev->pers) 2676 err = -EBUSY; 2677 else { 2678 clear_bit(Replacement, &rdev->flags); 2679 err = 0; 2680 } 2681 } 2682 if (!err) 2683 sysfs_notify_dirent_safe(rdev->sysfs_state); 2684 return err ? err : len; 2685 } 2686 static struct rdev_sysfs_entry rdev_state = 2687 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); 2688 2689 static ssize_t 2690 errors_show(struct md_rdev *rdev, char *page) 2691 { 2692 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); 2693 } 2694 2695 static ssize_t 2696 errors_store(struct md_rdev *rdev, const char *buf, size_t len) 2697 { 2698 char *e; 2699 unsigned long n = simple_strtoul(buf, &e, 10); 2700 if (*buf && (*e == 0 || *e == '\n')) { 2701 atomic_set(&rdev->corrected_errors, n); 2702 return len; 2703 } 2704 return -EINVAL; 2705 } 2706 static struct rdev_sysfs_entry rdev_errors = 2707 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); 2708 2709 static ssize_t 2710 slot_show(struct md_rdev *rdev, char *page) 2711 { 2712 if (rdev->raid_disk < 0) 2713 return sprintf(page, "none\n"); 2714 else 2715 return sprintf(page, "%d\n", rdev->raid_disk); 2716 } 2717 2718 static ssize_t 2719 slot_store(struct md_rdev *rdev, const char *buf, size_t len) 2720 { 2721 char *e; 2722 int err; 2723 int slot = simple_strtoul(buf, &e, 10); 2724 if (strncmp(buf, "none", 4)==0) 2725 slot = -1; 2726 else if (e==buf || (*e && *e!= '\n')) 2727 return -EINVAL; 2728 if (rdev->mddev->pers && slot == -1) { 2729 /* Setting 'slot' on an active array requires also 2730 * updating the 'rd%d' link, and communicating 2731 * with the personality with ->hot_*_disk. 2732 * For now we only support removing 2733 * failed/spare devices. This normally happens automatically, 2734 * but not when the metadata is externally managed. 2735 */ 2736 if (rdev->raid_disk == -1) 2737 return -EEXIST; 2738 /* personality does all needed checks */ 2739 if (rdev->mddev->pers->hot_remove_disk == NULL) 2740 return -EINVAL; 2741 err = rdev->mddev->pers-> 2742 hot_remove_disk(rdev->mddev, rdev); 2743 if (err) 2744 return err; 2745 sysfs_unlink_rdev(rdev->mddev, rdev); 2746 rdev->raid_disk = -1; 2747 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2748 md_wakeup_thread(rdev->mddev->thread); 2749 } else if (rdev->mddev->pers) { 2750 /* Activating a spare .. or possibly reactivating 2751 * if we ever get bitmaps working here. 2752 */ 2753 2754 if (rdev->raid_disk != -1) 2755 return -EBUSY; 2756 2757 if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) 2758 return -EBUSY; 2759 2760 if (rdev->mddev->pers->hot_add_disk == NULL) 2761 return -EINVAL; 2762 2763 if (slot >= rdev->mddev->raid_disks && 2764 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 2765 return -ENOSPC; 2766 2767 rdev->raid_disk = slot; 2768 if (test_bit(In_sync, &rdev->flags)) 2769 rdev->saved_raid_disk = slot; 2770 else 2771 rdev->saved_raid_disk = -1; 2772 clear_bit(In_sync, &rdev->flags); 2773 err = rdev->mddev->pers-> 2774 hot_add_disk(rdev->mddev, rdev); 2775 if (err) { 2776 rdev->raid_disk = -1; 2777 return err; 2778 } else 2779 sysfs_notify_dirent_safe(rdev->sysfs_state); 2780 if (sysfs_link_rdev(rdev->mddev, rdev)) 2781 /* failure here is OK */; 2782 /* don't wakeup anyone, leave that to userspace. */ 2783 } else { 2784 if (slot >= rdev->mddev->raid_disks && 2785 slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) 2786 return -ENOSPC; 2787 rdev->raid_disk = slot; 2788 /* assume it is working */ 2789 clear_bit(Faulty, &rdev->flags); 2790 clear_bit(WriteMostly, &rdev->flags); 2791 set_bit(In_sync, &rdev->flags); 2792 sysfs_notify_dirent_safe(rdev->sysfs_state); 2793 } 2794 return len; 2795 } 2796 2797 2798 static struct rdev_sysfs_entry rdev_slot = 2799 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); 2800 2801 static ssize_t 2802 offset_show(struct md_rdev *rdev, char *page) 2803 { 2804 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); 2805 } 2806 2807 static ssize_t 2808 offset_store(struct md_rdev *rdev, const char *buf, size_t len) 2809 { 2810 char *e; 2811 unsigned long long offset = simple_strtoull(buf, &e, 10); 2812 if (e==buf || (*e && *e != '\n')) 2813 return -EINVAL; 2814 if (rdev->mddev->pers && rdev->raid_disk >= 0) 2815 return -EBUSY; 2816 if (rdev->sectors && rdev->mddev->external) 2817 /* Must set offset before size, so overlap checks 2818 * can be sane */ 2819 return -EBUSY; 2820 rdev->data_offset = offset; 2821 return len; 2822 } 2823 2824 static struct rdev_sysfs_entry rdev_offset = 2825 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); 2826 2827 static ssize_t 2828 rdev_size_show(struct md_rdev *rdev, char *page) 2829 { 2830 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); 2831 } 2832 2833 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) 2834 { 2835 /* check if two start/length pairs overlap */ 2836 if (s1+l1 <= s2) 2837 return 0; 2838 if (s2+l2 <= s1) 2839 return 0; 2840 return 1; 2841 } 2842 2843 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) 2844 { 2845 unsigned long long blocks; 2846 sector_t new; 2847 2848 if (strict_strtoull(buf, 10, &blocks) < 0) 2849 return -EINVAL; 2850 2851 if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) 2852 return -EINVAL; /* sector conversion overflow */ 2853 2854 new = blocks * 2; 2855 if (new != blocks * 2) 2856 return -EINVAL; /* unsigned long long to sector_t overflow */ 2857 2858 *sectors = new; 2859 return 0; 2860 } 2861 2862 static ssize_t 2863 rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) 2864 { 2865 struct mddev *my_mddev = rdev->mddev; 2866 sector_t oldsectors = rdev->sectors; 2867 sector_t sectors; 2868 2869 if (strict_blocks_to_sectors(buf, §ors) < 0) 2870 return -EINVAL; 2871 if (my_mddev->pers && rdev->raid_disk >= 0) { 2872 if (my_mddev->persistent) { 2873 sectors = super_types[my_mddev->major_version]. 2874 rdev_size_change(rdev, sectors); 2875 if (!sectors) 2876 return -EBUSY; 2877 } else if (!sectors) 2878 sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - 2879 rdev->data_offset; 2880 } 2881 if (sectors < my_mddev->dev_sectors) 2882 return -EINVAL; /* component must fit device */ 2883 2884 rdev->sectors = sectors; 2885 if (sectors > oldsectors && my_mddev->external) { 2886 /* need to check that all other rdevs with the same ->bdev 2887 * do not overlap. We need to unlock the mddev to avoid 2888 * a deadlock. We have already changed rdev->sectors, and if 2889 * we have to change it back, we will have the lock again. 2890 */ 2891 struct mddev *mddev; 2892 int overlap = 0; 2893 struct list_head *tmp; 2894 2895 mddev_unlock(my_mddev); 2896 for_each_mddev(mddev, tmp) { 2897 struct md_rdev *rdev2; 2898 2899 mddev_lock(mddev); 2900 rdev_for_each(rdev2, mddev) 2901 if (rdev->bdev == rdev2->bdev && 2902 rdev != rdev2 && 2903 overlaps(rdev->data_offset, rdev->sectors, 2904 rdev2->data_offset, 2905 rdev2->sectors)) { 2906 overlap = 1; 2907 break; 2908 } 2909 mddev_unlock(mddev); 2910 if (overlap) { 2911 mddev_put(mddev); 2912 break; 2913 } 2914 } 2915 mddev_lock(my_mddev); 2916 if (overlap) { 2917 /* Someone else could have slipped in a size 2918 * change here, but doing so is just silly. 2919 * We put oldsectors back because we *know* it is 2920 * safe, and trust userspace not to race with 2921 * itself 2922 */ 2923 rdev->sectors = oldsectors; 2924 return -EBUSY; 2925 } 2926 } 2927 return len; 2928 } 2929 2930 static struct rdev_sysfs_entry rdev_size = 2931 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); 2932 2933 2934 static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) 2935 { 2936 unsigned long long recovery_start = rdev->recovery_offset; 2937 2938 if (test_bit(In_sync, &rdev->flags) || 2939 recovery_start == MaxSector) 2940 return sprintf(page, "none\n"); 2941 2942 return sprintf(page, "%llu\n", recovery_start); 2943 } 2944 2945 static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) 2946 { 2947 unsigned long long recovery_start; 2948 2949 if (cmd_match(buf, "none")) 2950 recovery_start = MaxSector; 2951 else if (strict_strtoull(buf, 10, &recovery_start)) 2952 return -EINVAL; 2953 2954 if (rdev->mddev->pers && 2955 rdev->raid_disk >= 0) 2956 return -EBUSY; 2957 2958 rdev->recovery_offset = recovery_start; 2959 if (recovery_start == MaxSector) 2960 set_bit(In_sync, &rdev->flags); 2961 else 2962 clear_bit(In_sync, &rdev->flags); 2963 return len; 2964 } 2965 2966 static struct rdev_sysfs_entry rdev_recovery_start = 2967 __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); 2968 2969 2970 static ssize_t 2971 badblocks_show(struct badblocks *bb, char *page, int unack); 2972 static ssize_t 2973 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); 2974 2975 static ssize_t bb_show(struct md_rdev *rdev, char *page) 2976 { 2977 return badblocks_show(&rdev->badblocks, page, 0); 2978 } 2979 static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) 2980 { 2981 int rv = badblocks_store(&rdev->badblocks, page, len, 0); 2982 /* Maybe that ack was all we needed */ 2983 if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) 2984 wake_up(&rdev->blocked_wait); 2985 return rv; 2986 } 2987 static struct rdev_sysfs_entry rdev_bad_blocks = 2988 __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); 2989 2990 2991 static ssize_t ubb_show(struct md_rdev *rdev, char *page) 2992 { 2993 return badblocks_show(&rdev->badblocks, page, 1); 2994 } 2995 static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) 2996 { 2997 return badblocks_store(&rdev->badblocks, page, len, 1); 2998 } 2999 static struct rdev_sysfs_entry rdev_unack_bad_blocks = 3000 __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); 3001 3002 static struct attribute *rdev_default_attrs[] = { 3003 &rdev_state.attr, 3004 &rdev_errors.attr, 3005 &rdev_slot.attr, 3006 &rdev_offset.attr, 3007 &rdev_size.attr, 3008 &rdev_recovery_start.attr, 3009 &rdev_bad_blocks.attr, 3010 &rdev_unack_bad_blocks.attr, 3011 NULL, 3012 }; 3013 static ssize_t 3014 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 3015 { 3016 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 3017 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 3018 struct mddev *mddev = rdev->mddev; 3019 ssize_t rv; 3020 3021 if (!entry->show) 3022 return -EIO; 3023 3024 rv = mddev ? mddev_lock(mddev) : -EBUSY; 3025 if (!rv) { 3026 if (rdev->mddev == NULL) 3027 rv = -EBUSY; 3028 else 3029 rv = entry->show(rdev, page); 3030 mddev_unlock(mddev); 3031 } 3032 return rv; 3033 } 3034 3035 static ssize_t 3036 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 3037 const char *page, size_t length) 3038 { 3039 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 3040 struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 3041 ssize_t rv; 3042 struct mddev *mddev = rdev->mddev; 3043 3044 if (!entry->store) 3045 return -EIO; 3046 if (!capable(CAP_SYS_ADMIN)) 3047 return -EACCES; 3048 rv = mddev ? mddev_lock(mddev): -EBUSY; 3049 if (!rv) { 3050 if (rdev->mddev == NULL) 3051 rv = -EBUSY; 3052 else 3053 rv = entry->store(rdev, page, length); 3054 mddev_unlock(mddev); 3055 } 3056 return rv; 3057 } 3058 3059 static void rdev_free(struct kobject *ko) 3060 { 3061 struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); 3062 kfree(rdev); 3063 } 3064 static const struct sysfs_ops rdev_sysfs_ops = { 3065 .show = rdev_attr_show, 3066 .store = rdev_attr_store, 3067 }; 3068 static struct kobj_type rdev_ktype = { 3069 .release = rdev_free, 3070 .sysfs_ops = &rdev_sysfs_ops, 3071 .default_attrs = rdev_default_attrs, 3072 }; 3073 3074 int md_rdev_init(struct md_rdev *rdev) 3075 { 3076 rdev->desc_nr = -1; 3077 rdev->saved_raid_disk = -1; 3078 rdev->raid_disk = -1; 3079 rdev->flags = 0; 3080 rdev->data_offset = 0; 3081 rdev->sb_events = 0; 3082 rdev->last_read_error.tv_sec = 0; 3083 rdev->last_read_error.tv_nsec = 0; 3084 rdev->sb_loaded = 0; 3085 rdev->bb_page = NULL; 3086 atomic_set(&rdev->nr_pending, 0); 3087 atomic_set(&rdev->read_errors, 0); 3088 atomic_set(&rdev->corrected_errors, 0); 3089 3090 INIT_LIST_HEAD(&rdev->same_set); 3091 init_waitqueue_head(&rdev->blocked_wait); 3092 3093 /* Add space to store bad block list. 3094 * This reserves the space even on arrays where it cannot 3095 * be used - I wonder if that matters 3096 */ 3097 rdev->badblocks.count = 0; 3098 rdev->badblocks.shift = 0; 3099 rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); 3100 seqlock_init(&rdev->badblocks.lock); 3101 if (rdev->badblocks.page == NULL) 3102 return -ENOMEM; 3103 3104 return 0; 3105 } 3106 EXPORT_SYMBOL_GPL(md_rdev_init); 3107 /* 3108 * Import a device. If 'super_format' >= 0, then sanity check the superblock 3109 * 3110 * mark the device faulty if: 3111 * 3112 * - the device is nonexistent (zero size) 3113 * - the device has no valid superblock 3114 * 3115 * a faulty rdev _never_ has rdev->sb set. 3116 */ 3117 static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) 3118 { 3119 char b[BDEVNAME_SIZE]; 3120 int err; 3121 struct md_rdev *rdev; 3122 sector_t size; 3123 3124 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); 3125 if (!rdev) { 3126 printk(KERN_ERR "md: could not alloc mem for new device!\n"); 3127 return ERR_PTR(-ENOMEM); 3128 } 3129 3130 err = md_rdev_init(rdev); 3131 if (err) 3132 goto abort_free; 3133 err = alloc_disk_sb(rdev); 3134 if (err) 3135 goto abort_free; 3136 3137 err = lock_rdev(rdev, newdev, super_format == -2); 3138 if (err) 3139 goto abort_free; 3140 3141 kobject_init(&rdev->kobj, &rdev_ktype); 3142 3143 size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; 3144 if (!size) { 3145 printk(KERN_WARNING 3146 "md: %s has zero or unknown size, marking faulty!\n", 3147 bdevname(rdev->bdev,b)); 3148 err = -EINVAL; 3149 goto abort_free; 3150 } 3151 3152 if (super_format >= 0) { 3153 err = super_types[super_format]. 3154 load_super(rdev, NULL, super_minor); 3155 if (err == -EINVAL) { 3156 printk(KERN_WARNING 3157 "md: %s does not have a valid v%d.%d " 3158 "superblock, not importing!\n", 3159 bdevname(rdev->bdev,b), 3160 super_format, super_minor); 3161 goto abort_free; 3162 } 3163 if (err < 0) { 3164 printk(KERN_WARNING 3165 "md: could not read %s's sb, not importing!\n", 3166 bdevname(rdev->bdev,b)); 3167 goto abort_free; 3168 } 3169 } 3170 if (super_format == -1) 3171 /* hot-add for 0.90, or non-persistent: so no badblocks */ 3172 rdev->badblocks.shift = -1; 3173 3174 return rdev; 3175 3176 abort_free: 3177 if (rdev->bdev) 3178 unlock_rdev(rdev); 3179 free_disk_sb(rdev); 3180 kfree(rdev->badblocks.page); 3181 kfree(rdev); 3182 return ERR_PTR(err); 3183 } 3184 3185 /* 3186 * Check a full RAID array for plausibility 3187 */ 3188 3189 3190 static void analyze_sbs(struct mddev * mddev) 3191 { 3192 int i; 3193 struct md_rdev *rdev, *freshest, *tmp; 3194 char b[BDEVNAME_SIZE]; 3195 3196 freshest = NULL; 3197 rdev_for_each_safe(rdev, tmp, mddev) 3198 switch (super_types[mddev->major_version]. 3199 load_super(rdev, freshest, mddev->minor_version)) { 3200 case 1: 3201 freshest = rdev; 3202 break; 3203 case 0: 3204 break; 3205 default: 3206 printk( KERN_ERR \ 3207 "md: fatal superblock inconsistency in %s" 3208 " -- removing from array\n", 3209 bdevname(rdev->bdev,b)); 3210 kick_rdev_from_array(rdev); 3211 } 3212 3213 3214 super_types[mddev->major_version]. 3215 validate_super(mddev, freshest); 3216 3217 i = 0; 3218 rdev_for_each_safe(rdev, tmp, mddev) { 3219 if (mddev->max_disks && 3220 (rdev->desc_nr >= mddev->max_disks || 3221 i > mddev->max_disks)) { 3222 printk(KERN_WARNING 3223 "md: %s: %s: only %d devices permitted\n", 3224 mdname(mddev), bdevname(rdev->bdev, b), 3225 mddev->max_disks); 3226 kick_rdev_from_array(rdev); 3227 continue; 3228 } 3229 if (rdev != freshest) 3230 if (super_types[mddev->major_version]. 3231 validate_super(mddev, rdev)) { 3232 printk(KERN_WARNING "md: kicking non-fresh %s" 3233 " from array!\n", 3234 bdevname(rdev->bdev,b)); 3235 kick_rdev_from_array(rdev); 3236 continue; 3237 } 3238 if (mddev->level == LEVEL_MULTIPATH) { 3239 rdev->desc_nr = i++; 3240 rdev->raid_disk = rdev->desc_nr; 3241 set_bit(In_sync, &rdev->flags); 3242 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { 3243 rdev->raid_disk = -1; 3244 clear_bit(In_sync, &rdev->flags); 3245 } 3246 } 3247 } 3248 3249 /* Read a fixed-point number. 3250 * Numbers in sysfs attributes should be in "standard" units where 3251 * possible, so time should be in seconds. 3252 * However we internally use a a much smaller unit such as 3253 * milliseconds or jiffies. 3254 * This function takes a decimal number with a possible fractional 3255 * component, and produces an integer which is the result of 3256 * multiplying that number by 10^'scale'. 3257 * all without any floating-point arithmetic. 3258 */ 3259 int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) 3260 { 3261 unsigned long result = 0; 3262 long decimals = -1; 3263 while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { 3264 if (*cp == '.') 3265 decimals = 0; 3266 else if (decimals < scale) { 3267 unsigned int value; 3268 value = *cp - '0'; 3269 result = result * 10 + value; 3270 if (decimals >= 0) 3271 decimals++; 3272 } 3273 cp++; 3274 } 3275 if (*cp == '\n') 3276 cp++; 3277 if (*cp) 3278 return -EINVAL; 3279 if (decimals < 0) 3280 decimals = 0; 3281 while (decimals < scale) { 3282 result *= 10; 3283 decimals ++; 3284 } 3285 *res = result; 3286 return 0; 3287 } 3288 3289 3290 static void md_safemode_timeout(unsigned long data); 3291 3292 static ssize_t 3293 safe_delay_show(struct mddev *mddev, char *page) 3294 { 3295 int msec = (mddev->safemode_delay*1000)/HZ; 3296 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); 3297 } 3298 static ssize_t 3299 safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) 3300 { 3301 unsigned long msec; 3302 3303 if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) 3304 return -EINVAL; 3305 if (msec == 0) 3306 mddev->safemode_delay = 0; 3307 else { 3308 unsigned long old_delay = mddev->safemode_delay; 3309 mddev->safemode_delay = (msec*HZ)/1000; 3310 if (mddev->safemode_delay == 0) 3311 mddev->safemode_delay = 1; 3312 if (mddev->safemode_delay < old_delay) 3313 md_safemode_timeout((unsigned long)mddev); 3314 } 3315 return len; 3316 } 3317 static struct md_sysfs_entry md_safe_delay = 3318 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); 3319 3320 static ssize_t 3321 level_show(struct mddev *mddev, char *page) 3322 { 3323 struct md_personality *p = mddev->pers; 3324 if (p) 3325 return sprintf(page, "%s\n", p->name); 3326 else if (mddev->clevel[0]) 3327 return sprintf(page, "%s\n", mddev->clevel); 3328 else if (mddev->level != LEVEL_NONE) 3329 return sprintf(page, "%d\n", mddev->level); 3330 else 3331 return 0; 3332 } 3333 3334 static ssize_t 3335 level_store(struct mddev *mddev, const char *buf, size_t len) 3336 { 3337 char clevel[16]; 3338 ssize_t rv = len; 3339 struct md_personality *pers; 3340 long level; 3341 void *priv; 3342 struct md_rdev *rdev; 3343 3344 if (mddev->pers == NULL) { 3345 if (len == 0) 3346 return 0; 3347 if (len >= sizeof(mddev->clevel)) 3348 return -ENOSPC; 3349 strncpy(mddev->clevel, buf, len); 3350 if (mddev->clevel[len-1] == '\n') 3351 len--; 3352 mddev->clevel[len] = 0; 3353 mddev->level = LEVEL_NONE; 3354 return rv; 3355 } 3356 3357 /* request to change the personality. Need to ensure: 3358 * - array is not engaged in resync/recovery/reshape 3359 * - old personality can be suspended 3360 * - new personality will access other array. 3361 */ 3362 3363 if (mddev->sync_thread || 3364 mddev->reshape_position != MaxSector || 3365 mddev->sysfs_active) 3366 return -EBUSY; 3367 3368 if (!mddev->pers->quiesce) { 3369 printk(KERN_WARNING "md: %s: %s does not support online personality change\n", 3370 mdname(mddev), mddev->pers->name); 3371 return -EINVAL; 3372 } 3373 3374 /* Now find the new personality */ 3375 if (len == 0 || len >= sizeof(clevel)) 3376 return -EINVAL; 3377 strncpy(clevel, buf, len); 3378 if (clevel[len-1] == '\n') 3379 len--; 3380 clevel[len] = 0; 3381 if (strict_strtol(clevel, 10, &level)) 3382 level = LEVEL_NONE; 3383 3384 if (request_module("md-%s", clevel) != 0) 3385 request_module("md-level-%s", clevel); 3386 spin_lock(&pers_lock); 3387 pers = find_pers(level, clevel); 3388 if (!pers || !try_module_get(pers->owner)) { 3389 spin_unlock(&pers_lock); 3390 printk(KERN_WARNING "md: personality %s not loaded\n", clevel); 3391 return -EINVAL; 3392 } 3393 spin_unlock(&pers_lock); 3394 3395 if (pers == mddev->pers) { 3396 /* Nothing to do! */ 3397 module_put(pers->owner); 3398 return rv; 3399 } 3400 if (!pers->takeover) { 3401 module_put(pers->owner); 3402 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", 3403 mdname(mddev), clevel); 3404 return -EINVAL; 3405 } 3406 3407 rdev_for_each(rdev, mddev) 3408 rdev->new_raid_disk = rdev->raid_disk; 3409 3410 /* ->takeover must set new_* and/or delta_disks 3411 * if it succeeds, and may set them when it fails. 3412 */ 3413 priv = pers->takeover(mddev); 3414 if (IS_ERR(priv)) { 3415 mddev->new_level = mddev->level; 3416 mddev->new_layout = mddev->layout; 3417 mddev->new_chunk_sectors = mddev->chunk_sectors; 3418 mddev->raid_disks -= mddev->delta_disks; 3419 mddev->delta_disks = 0; 3420 module_put(pers->owner); 3421 printk(KERN_WARNING "md: %s: %s would not accept array\n", 3422 mdname(mddev), clevel); 3423 return PTR_ERR(priv); 3424 } 3425 3426 /* Looks like we have a winner */ 3427 mddev_suspend(mddev); 3428 mddev->pers->stop(mddev); 3429 3430 if (mddev->pers->sync_request == NULL && 3431 pers->sync_request != NULL) { 3432 /* need to add the md_redundancy_group */ 3433 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 3434 printk(KERN_WARNING 3435 "md: cannot register extra attributes for %s\n", 3436 mdname(mddev)); 3437 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); 3438 } 3439 if (mddev->pers->sync_request != NULL && 3440 pers->sync_request == NULL) { 3441 /* need to remove the md_redundancy_group */ 3442 if (mddev->to_remove == NULL) 3443 mddev->to_remove = &md_redundancy_group; 3444 } 3445 3446 if (mddev->pers->sync_request == NULL && 3447 mddev->external) { 3448 /* We are converting from a no-redundancy array 3449 * to a redundancy array and metadata is managed 3450 * externally so we need to be sure that writes 3451 * won't block due to a need to transition 3452 * clean->dirty 3453 * until external management is started. 3454 */ 3455 mddev->in_sync = 0; 3456 mddev->safemode_delay = 0; 3457 mddev->safemode = 0; 3458 } 3459 3460 rdev_for_each(rdev, mddev) { 3461 if (rdev->raid_disk < 0) 3462 continue; 3463 if (rdev->new_raid_disk >= mddev->raid_disks) 3464 rdev->new_raid_disk = -1; 3465 if (rdev->new_raid_disk == rdev->raid_disk) 3466 continue; 3467 sysfs_unlink_rdev(mddev, rdev); 3468 } 3469 rdev_for_each(rdev, mddev) { 3470 if (rdev->raid_disk < 0) 3471 continue; 3472 if (rdev->new_raid_disk == rdev->raid_disk) 3473 continue; 3474 rdev->raid_disk = rdev->new_raid_disk; 3475 if (rdev->raid_disk < 0) 3476 clear_bit(In_sync, &rdev->flags); 3477 else { 3478 if (sysfs_link_rdev(mddev, rdev)) 3479 printk(KERN_WARNING "md: cannot register rd%d" 3480 " for %s after level change\n", 3481 rdev->raid_disk, mdname(mddev)); 3482 } 3483 } 3484 3485 module_put(mddev->pers->owner); 3486 mddev->pers = pers; 3487 mddev->private = priv; 3488 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 3489 mddev->level = mddev->new_level; 3490 mddev->layout = mddev->new_layout; 3491 mddev->chunk_sectors = mddev->new_chunk_sectors; 3492 mddev->delta_disks = 0; 3493 mddev->degraded = 0; 3494 if (mddev->pers->sync_request == NULL) { 3495 /* this is now an array without redundancy, so 3496 * it must always be in_sync 3497 */ 3498 mddev->in_sync = 1; 3499 del_timer_sync(&mddev->safemode_timer); 3500 } 3501 pers->run(mddev); 3502 mddev_resume(mddev); 3503 set_bit(MD_CHANGE_DEVS, &mddev->flags); 3504 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3505 md_wakeup_thread(mddev->thread); 3506 sysfs_notify(&mddev->kobj, NULL, "level"); 3507 md_new_event(mddev); 3508 return rv; 3509 } 3510 3511 static struct md_sysfs_entry md_level = 3512 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); 3513 3514 3515 static ssize_t 3516 layout_show(struct mddev *mddev, char *page) 3517 { 3518 /* just a number, not meaningful for all levels */ 3519 if (mddev->reshape_position != MaxSector && 3520 mddev->layout != mddev->new_layout) 3521 return sprintf(page, "%d (%d)\n", 3522 mddev->new_layout, mddev->layout); 3523 return sprintf(page, "%d\n", mddev->layout); 3524 } 3525 3526 static ssize_t 3527 layout_store(struct mddev *mddev, const char *buf, size_t len) 3528 { 3529 char *e; 3530 unsigned long n = simple_strtoul(buf, &e, 10); 3531 3532 if (!*buf || (*e && *e != '\n')) 3533 return -EINVAL; 3534 3535 if (mddev->pers) { 3536 int err; 3537 if (mddev->pers->check_reshape == NULL) 3538 return -EBUSY; 3539 mddev->new_layout = n; 3540 err = mddev->pers->check_reshape(mddev); 3541 if (err) { 3542 mddev->new_layout = mddev->layout; 3543 return err; 3544 } 3545 } else { 3546 mddev->new_layout = n; 3547 if (mddev->reshape_position == MaxSector) 3548 mddev->layout = n; 3549 } 3550 return len; 3551 } 3552 static struct md_sysfs_entry md_layout = 3553 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); 3554 3555 3556 static ssize_t 3557 raid_disks_show(struct mddev *mddev, char *page) 3558 { 3559 if (mddev->raid_disks == 0) 3560 return 0; 3561 if (mddev->reshape_position != MaxSector && 3562 mddev->delta_disks != 0) 3563 return sprintf(page, "%d (%d)\n", mddev->raid_disks, 3564 mddev->raid_disks - mddev->delta_disks); 3565 return sprintf(page, "%d\n", mddev->raid_disks); 3566 } 3567 3568 static int update_raid_disks(struct mddev *mddev, int raid_disks); 3569 3570 static ssize_t 3571 raid_disks_store(struct mddev *mddev, const char *buf, size_t len) 3572 { 3573 char *e; 3574 int rv = 0; 3575 unsigned long n = simple_strtoul(buf, &e, 10); 3576 3577 if (!*buf || (*e && *e != '\n')) 3578 return -EINVAL; 3579 3580 if (mddev->pers) 3581 rv = update_raid_disks(mddev, n); 3582 else if (mddev->reshape_position != MaxSector) { 3583 int olddisks = mddev->raid_disks - mddev->delta_disks; 3584 mddev->delta_disks = n - olddisks; 3585 mddev->raid_disks = n; 3586 } else 3587 mddev->raid_disks = n; 3588 return rv ? rv : len; 3589 } 3590 static struct md_sysfs_entry md_raid_disks = 3591 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); 3592 3593 static ssize_t 3594 chunk_size_show(struct mddev *mddev, char *page) 3595 { 3596 if (mddev->reshape_position != MaxSector && 3597 mddev->chunk_sectors != mddev->new_chunk_sectors) 3598 return sprintf(page, "%d (%d)\n", 3599 mddev->new_chunk_sectors << 9, 3600 mddev->chunk_sectors << 9); 3601 return sprintf(page, "%d\n", mddev->chunk_sectors << 9); 3602 } 3603 3604 static ssize_t 3605 chunk_size_store(struct mddev *mddev, const char *buf, size_t len) 3606 { 3607 char *e; 3608 unsigned long n = simple_strtoul(buf, &e, 10); 3609 3610 if (!*buf || (*e && *e != '\n')) 3611 return -EINVAL; 3612 3613 if (mddev->pers) { 3614 int err; 3615 if (mddev->pers->check_reshape == NULL) 3616 return -EBUSY; 3617 mddev->new_chunk_sectors = n >> 9; 3618 err = mddev->pers->check_reshape(mddev); 3619 if (err) { 3620 mddev->new_chunk_sectors = mddev->chunk_sectors; 3621 return err; 3622 } 3623 } else { 3624 mddev->new_chunk_sectors = n >> 9; 3625 if (mddev->reshape_position == MaxSector) 3626 mddev->chunk_sectors = n >> 9; 3627 } 3628 return len; 3629 } 3630 static struct md_sysfs_entry md_chunk_size = 3631 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); 3632 3633 static ssize_t 3634 resync_start_show(struct mddev *mddev, char *page) 3635 { 3636 if (mddev->recovery_cp == MaxSector) 3637 return sprintf(page, "none\n"); 3638 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); 3639 } 3640 3641 static ssize_t 3642 resync_start_store(struct mddev *mddev, const char *buf, size_t len) 3643 { 3644 char *e; 3645 unsigned long long n = simple_strtoull(buf, &e, 10); 3646 3647 if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 3648 return -EBUSY; 3649 if (cmd_match(buf, "none")) 3650 n = MaxSector; 3651 else if (!*buf || (*e && *e != '\n')) 3652 return -EINVAL; 3653 3654 mddev->recovery_cp = n; 3655 return len; 3656 } 3657 static struct md_sysfs_entry md_resync_start = 3658 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); 3659 3660 /* 3661 * The array state can be: 3662 * 3663 * clear 3664 * No devices, no size, no level 3665 * Equivalent to STOP_ARRAY ioctl 3666 * inactive 3667 * May have some settings, but array is not active 3668 * all IO results in error 3669 * When written, doesn't tear down array, but just stops it 3670 * suspended (not supported yet) 3671 * All IO requests will block. The array can be reconfigured. 3672 * Writing this, if accepted, will block until array is quiescent 3673 * readonly 3674 * no resync can happen. no superblocks get written. 3675 * write requests fail 3676 * read-auto 3677 * like readonly, but behaves like 'clean' on a write request. 3678 * 3679 * clean - no pending writes, but otherwise active. 3680 * When written to inactive array, starts without resync 3681 * If a write request arrives then 3682 * if metadata is known, mark 'dirty' and switch to 'active'. 3683 * if not known, block and switch to write-pending 3684 * If written to an active array that has pending writes, then fails. 3685 * active 3686 * fully active: IO and resync can be happening. 3687 * When written to inactive array, starts with resync 3688 * 3689 * write-pending 3690 * clean, but writes are blocked waiting for 'active' to be written. 3691 * 3692 * active-idle 3693 * like active, but no writes have been seen for a while (100msec). 3694 * 3695 */ 3696 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, 3697 write_pending, active_idle, bad_word}; 3698 static char *array_states[] = { 3699 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", 3700 "write-pending", "active-idle", NULL }; 3701 3702 static int match_word(const char *word, char **list) 3703 { 3704 int n; 3705 for (n=0; list[n]; n++) 3706 if (cmd_match(word, list[n])) 3707 break; 3708 return n; 3709 } 3710 3711 static ssize_t 3712 array_state_show(struct mddev *mddev, char *page) 3713 { 3714 enum array_state st = inactive; 3715 3716 if (mddev->pers) 3717 switch(mddev->ro) { 3718 case 1: 3719 st = readonly; 3720 break; 3721 case 2: 3722 st = read_auto; 3723 break; 3724 case 0: 3725 if (mddev->in_sync) 3726 st = clean; 3727 else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) 3728 st = write_pending; 3729 else if (mddev->safemode) 3730 st = active_idle; 3731 else 3732 st = active; 3733 } 3734 else { 3735 if (list_empty(&mddev->disks) && 3736 mddev->raid_disks == 0 && 3737 mddev->dev_sectors == 0) 3738 st = clear; 3739 else 3740 st = inactive; 3741 } 3742 return sprintf(page, "%s\n", array_states[st]); 3743 } 3744 3745 static int do_md_stop(struct mddev * mddev, int ro, int is_open); 3746 static int md_set_readonly(struct mddev * mddev, int is_open); 3747 static int do_md_run(struct mddev * mddev); 3748 static int restart_array(struct mddev *mddev); 3749 3750 static ssize_t 3751 array_state_store(struct mddev *mddev, const char *buf, size_t len) 3752 { 3753 int err = -EINVAL; 3754 enum array_state st = match_word(buf, array_states); 3755 switch(st) { 3756 case bad_word: 3757 break; 3758 case clear: 3759 /* stopping an active array */ 3760 if (atomic_read(&mddev->openers) > 0) 3761 return -EBUSY; 3762 err = do_md_stop(mddev, 0, 0); 3763 break; 3764 case inactive: 3765 /* stopping an active array */ 3766 if (mddev->pers) { 3767 if (atomic_read(&mddev->openers) > 0) 3768 return -EBUSY; 3769 err = do_md_stop(mddev, 2, 0); 3770 } else 3771 err = 0; /* already inactive */ 3772 break; 3773 case suspended: 3774 break; /* not supported yet */ 3775 case readonly: 3776 if (mddev->pers) 3777 err = md_set_readonly(mddev, 0); 3778 else { 3779 mddev->ro = 1; 3780 set_disk_ro(mddev->gendisk, 1); 3781 err = do_md_run(mddev); 3782 } 3783 break; 3784 case read_auto: 3785 if (mddev->pers) { 3786 if (mddev->ro == 0) 3787 err = md_set_readonly(mddev, 0); 3788 else if (mddev->ro == 1) 3789 err = restart_array(mddev); 3790 if (err == 0) { 3791 mddev->ro = 2; 3792 set_disk_ro(mddev->gendisk, 0); 3793 } 3794 } else { 3795 mddev->ro = 2; 3796 err = do_md_run(mddev); 3797 } 3798 break; 3799 case clean: 3800 if (mddev->pers) { 3801 restart_array(mddev); 3802 spin_lock_irq(&mddev->write_lock); 3803 if (atomic_read(&mddev->writes_pending) == 0) { 3804 if (mddev->in_sync == 0) { 3805 mddev->in_sync = 1; 3806 if (mddev->safemode == 1) 3807 mddev->safemode = 0; 3808 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 3809 } 3810 err = 0; 3811 } else 3812 err = -EBUSY; 3813 spin_unlock_irq(&mddev->write_lock); 3814 } else 3815 err = -EINVAL; 3816 break; 3817 case active: 3818 if (mddev->pers) { 3819 restart_array(mddev); 3820 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 3821 wake_up(&mddev->sb_wait); 3822 err = 0; 3823 } else { 3824 mddev->ro = 0; 3825 set_disk_ro(mddev->gendisk, 0); 3826 err = do_md_run(mddev); 3827 } 3828 break; 3829 case write_pending: 3830 case active_idle: 3831 /* these cannot be set */ 3832 break; 3833 } 3834 if (err) 3835 return err; 3836 else { 3837 if (mddev->hold_active == UNTIL_IOCTL) 3838 mddev->hold_active = 0; 3839 sysfs_notify_dirent_safe(mddev->sysfs_state); 3840 return len; 3841 } 3842 } 3843 static struct md_sysfs_entry md_array_state = 3844 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); 3845 3846 static ssize_t 3847 max_corrected_read_errors_show(struct mddev *mddev, char *page) { 3848 return sprintf(page, "%d\n", 3849 atomic_read(&mddev->max_corr_read_errors)); 3850 } 3851 3852 static ssize_t 3853 max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) 3854 { 3855 char *e; 3856 unsigned long n = simple_strtoul(buf, &e, 10); 3857 3858 if (*buf && (*e == 0 || *e == '\n')) { 3859 atomic_set(&mddev->max_corr_read_errors, n); 3860 return len; 3861 } 3862 return -EINVAL; 3863 } 3864 3865 static struct md_sysfs_entry max_corr_read_errors = 3866 __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, 3867 max_corrected_read_errors_store); 3868 3869 static ssize_t 3870 null_show(struct mddev *mddev, char *page) 3871 { 3872 return -EINVAL; 3873 } 3874 3875 static ssize_t 3876 new_dev_store(struct mddev *mddev, const char *buf, size_t len) 3877 { 3878 /* buf must be %d:%d\n? giving major and minor numbers */ 3879 /* The new device is added to the array. 3880 * If the array has a persistent superblock, we read the 3881 * superblock to initialise info and check validity. 3882 * Otherwise, only checking done is that in bind_rdev_to_array, 3883 * which mainly checks size. 3884 */ 3885 char *e; 3886 int major = simple_strtoul(buf, &e, 10); 3887 int minor; 3888 dev_t dev; 3889 struct md_rdev *rdev; 3890 int err; 3891 3892 if (!*buf || *e != ':' || !e[1] || e[1] == '\n') 3893 return -EINVAL; 3894 minor = simple_strtoul(e+1, &e, 10); 3895 if (*e && *e != '\n') 3896 return -EINVAL; 3897 dev = MKDEV(major, minor); 3898 if (major != MAJOR(dev) || 3899 minor != MINOR(dev)) 3900 return -EOVERFLOW; 3901 3902 3903 if (mddev->persistent) { 3904 rdev = md_import_device(dev, mddev->major_version, 3905 mddev->minor_version); 3906 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { 3907 struct md_rdev *rdev0 3908 = list_entry(mddev->disks.next, 3909 struct md_rdev, same_set); 3910 err = super_types[mddev->major_version] 3911 .load_super(rdev, rdev0, mddev->minor_version); 3912 if (err < 0) 3913 goto out; 3914 } 3915 } else if (mddev->external) 3916 rdev = md_import_device(dev, -2, -1); 3917 else 3918 rdev = md_import_device(dev, -1, -1); 3919 3920 if (IS_ERR(rdev)) 3921 return PTR_ERR(rdev); 3922 err = bind_rdev_to_array(rdev, mddev); 3923 out: 3924 if (err) 3925 export_rdev(rdev); 3926 return err ? err : len; 3927 } 3928 3929 static struct md_sysfs_entry md_new_device = 3930 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); 3931 3932 static ssize_t 3933 bitmap_store(struct mddev *mddev, const char *buf, size_t len) 3934 { 3935 char *end; 3936 unsigned long chunk, end_chunk; 3937 3938 if (!mddev->bitmap) 3939 goto out; 3940 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ 3941 while (*buf) { 3942 chunk = end_chunk = simple_strtoul(buf, &end, 0); 3943 if (buf == end) break; 3944 if (*end == '-') { /* range */ 3945 buf = end + 1; 3946 end_chunk = simple_strtoul(buf, &end, 0); 3947 if (buf == end) break; 3948 } 3949 if (*end && !isspace(*end)) break; 3950 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); 3951 buf = skip_spaces(end); 3952 } 3953 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ 3954 out: 3955 return len; 3956 } 3957 3958 static struct md_sysfs_entry md_bitmap = 3959 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); 3960 3961 static ssize_t 3962 size_show(struct mddev *mddev, char *page) 3963 { 3964 return sprintf(page, "%llu\n", 3965 (unsigned long long)mddev->dev_sectors / 2); 3966 } 3967 3968 static int update_size(struct mddev *mddev, sector_t num_sectors); 3969 3970 static ssize_t 3971 size_store(struct mddev *mddev, const char *buf, size_t len) 3972 { 3973 /* If array is inactive, we can reduce the component size, but 3974 * not increase it (except from 0). 3975 * If array is active, we can try an on-line resize 3976 */ 3977 sector_t sectors; 3978 int err = strict_blocks_to_sectors(buf, §ors); 3979 3980 if (err < 0) 3981 return err; 3982 if (mddev->pers) { 3983 err = update_size(mddev, sectors); 3984 md_update_sb(mddev, 1); 3985 } else { 3986 if (mddev->dev_sectors == 0 || 3987 mddev->dev_sectors > sectors) 3988 mddev->dev_sectors = sectors; 3989 else 3990 err = -ENOSPC; 3991 } 3992 return err ? err : len; 3993 } 3994 3995 static struct md_sysfs_entry md_size = 3996 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); 3997 3998 3999 /* Metdata version. 4000 * This is one of 4001 * 'none' for arrays with no metadata (good luck...) 4002 * 'external' for arrays with externally managed metadata, 4003 * or N.M for internally known formats 4004 */ 4005 static ssize_t 4006 metadata_show(struct mddev *mddev, char *page) 4007 { 4008 if (mddev->persistent) 4009 return sprintf(page, "%d.%d\n", 4010 mddev->major_version, mddev->minor_version); 4011 else if (mddev->external) 4012 return sprintf(page, "external:%s\n", mddev->metadata_type); 4013 else 4014 return sprintf(page, "none\n"); 4015 } 4016 4017 static ssize_t 4018 metadata_store(struct mddev *mddev, const char *buf, size_t len) 4019 { 4020 int major, minor; 4021 char *e; 4022 /* Changing the details of 'external' metadata is 4023 * always permitted. Otherwise there must be 4024 * no devices attached to the array. 4025 */ 4026 if (mddev->external && strncmp(buf, "external:", 9) == 0) 4027 ; 4028 else if (!list_empty(&mddev->disks)) 4029 return -EBUSY; 4030 4031 if (cmd_match(buf, "none")) { 4032 mddev->persistent = 0; 4033 mddev->external = 0; 4034 mddev->major_version = 0; 4035 mddev->minor_version = 90; 4036 return len; 4037 } 4038 if (strncmp(buf, "external:", 9) == 0) { 4039 size_t namelen = len-9; 4040 if (namelen >= sizeof(mddev->metadata_type)) 4041 namelen = sizeof(mddev->metadata_type)-1; 4042 strncpy(mddev->metadata_type, buf+9, namelen); 4043 mddev->metadata_type[namelen] = 0; 4044 if (namelen && mddev->metadata_type[namelen-1] == '\n') 4045 mddev->metadata_type[--namelen] = 0; 4046 mddev->persistent = 0; 4047 mddev->external = 1; 4048 mddev->major_version = 0; 4049 mddev->minor_version = 90; 4050 return len; 4051 } 4052 major = simple_strtoul(buf, &e, 10); 4053 if (e==buf || *e != '.') 4054 return -EINVAL; 4055 buf = e+1; 4056 minor = simple_strtoul(buf, &e, 10); 4057 if (e==buf || (*e && *e != '\n') ) 4058 return -EINVAL; 4059 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) 4060 return -ENOENT; 4061 mddev->major_version = major; 4062 mddev->minor_version = minor; 4063 mddev->persistent = 1; 4064 mddev->external = 0; 4065 return len; 4066 } 4067 4068 static struct md_sysfs_entry md_metadata = 4069 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); 4070 4071 static ssize_t 4072 action_show(struct mddev *mddev, char *page) 4073 { 4074 char *type = "idle"; 4075 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 4076 type = "frozen"; 4077 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 4078 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { 4079 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 4080 type = "reshape"; 4081 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 4082 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 4083 type = "resync"; 4084 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 4085 type = "check"; 4086 else 4087 type = "repair"; 4088 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) 4089 type = "recover"; 4090 } 4091 return sprintf(page, "%s\n", type); 4092 } 4093 4094 static void reap_sync_thread(struct mddev *mddev); 4095 4096 static ssize_t 4097 action_store(struct mddev *mddev, const char *page, size_t len) 4098 { 4099 if (!mddev->pers || !mddev->pers->sync_request) 4100 return -EINVAL; 4101 4102 if (cmd_match(page, "frozen")) 4103 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4104 else 4105 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4106 4107 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { 4108 if (mddev->sync_thread) { 4109 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4110 reap_sync_thread(mddev); 4111 } 4112 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 4113 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 4114 return -EBUSY; 4115 else if (cmd_match(page, "resync")) 4116 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4117 else if (cmd_match(page, "recover")) { 4118 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 4119 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4120 } else if (cmd_match(page, "reshape")) { 4121 int err; 4122 if (mddev->pers->start_reshape == NULL) 4123 return -EINVAL; 4124 err = mddev->pers->start_reshape(mddev); 4125 if (err) 4126 return err; 4127 sysfs_notify(&mddev->kobj, NULL, "degraded"); 4128 } else { 4129 if (cmd_match(page, "check")) 4130 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 4131 else if (!cmd_match(page, "repair")) 4132 return -EINVAL; 4133 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 4134 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 4135 } 4136 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4137 md_wakeup_thread(mddev->thread); 4138 sysfs_notify_dirent_safe(mddev->sysfs_action); 4139 return len; 4140 } 4141 4142 static ssize_t 4143 mismatch_cnt_show(struct mddev *mddev, char *page) 4144 { 4145 return sprintf(page, "%llu\n", 4146 (unsigned long long) mddev->resync_mismatches); 4147 } 4148 4149 static struct md_sysfs_entry md_scan_mode = 4150 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 4151 4152 4153 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); 4154 4155 static ssize_t 4156 sync_min_show(struct mddev *mddev, char *page) 4157 { 4158 return sprintf(page, "%d (%s)\n", speed_min(mddev), 4159 mddev->sync_speed_min ? "local": "system"); 4160 } 4161 4162 static ssize_t 4163 sync_min_store(struct mddev *mddev, const char *buf, size_t len) 4164 { 4165 int min; 4166 char *e; 4167 if (strncmp(buf, "system", 6)==0) { 4168 mddev->sync_speed_min = 0; 4169 return len; 4170 } 4171 min = simple_strtoul(buf, &e, 10); 4172 if (buf == e || (*e && *e != '\n') || min <= 0) 4173 return -EINVAL; 4174 mddev->sync_speed_min = min; 4175 return len; 4176 } 4177 4178 static struct md_sysfs_entry md_sync_min = 4179 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); 4180 4181 static ssize_t 4182 sync_max_show(struct mddev *mddev, char *page) 4183 { 4184 return sprintf(page, "%d (%s)\n", speed_max(mddev), 4185 mddev->sync_speed_max ? "local": "system"); 4186 } 4187 4188 static ssize_t 4189 sync_max_store(struct mddev *mddev, const char *buf, size_t len) 4190 { 4191 int max; 4192 char *e; 4193 if (strncmp(buf, "system", 6)==0) { 4194 mddev->sync_speed_max = 0; 4195 return len; 4196 } 4197 max = simple_strtoul(buf, &e, 10); 4198 if (buf == e || (*e && *e != '\n') || max <= 0) 4199 return -EINVAL; 4200 mddev->sync_speed_max = max; 4201 return len; 4202 } 4203 4204 static struct md_sysfs_entry md_sync_max = 4205 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); 4206 4207 static ssize_t 4208 degraded_show(struct mddev *mddev, char *page) 4209 { 4210 return sprintf(page, "%d\n", mddev->degraded); 4211 } 4212 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); 4213 4214 static ssize_t 4215 sync_force_parallel_show(struct mddev *mddev, char *page) 4216 { 4217 return sprintf(page, "%d\n", mddev->parallel_resync); 4218 } 4219 4220 static ssize_t 4221 sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) 4222 { 4223 long n; 4224 4225 if (strict_strtol(buf, 10, &n)) 4226 return -EINVAL; 4227 4228 if (n != 0 && n != 1) 4229 return -EINVAL; 4230 4231 mddev->parallel_resync = n; 4232 4233 if (mddev->sync_thread) 4234 wake_up(&resync_wait); 4235 4236 return len; 4237 } 4238 4239 /* force parallel resync, even with shared block devices */ 4240 static struct md_sysfs_entry md_sync_force_parallel = 4241 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, 4242 sync_force_parallel_show, sync_force_parallel_store); 4243 4244 static ssize_t 4245 sync_speed_show(struct mddev *mddev, char *page) 4246 { 4247 unsigned long resync, dt, db; 4248 if (mddev->curr_resync == 0) 4249 return sprintf(page, "none\n"); 4250 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); 4251 dt = (jiffies - mddev->resync_mark) / HZ; 4252 if (!dt) dt++; 4253 db = resync - mddev->resync_mark_cnt; 4254 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ 4255 } 4256 4257 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); 4258 4259 static ssize_t 4260 sync_completed_show(struct mddev *mddev, char *page) 4261 { 4262 unsigned long long max_sectors, resync; 4263 4264 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4265 return sprintf(page, "none\n"); 4266 4267 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 4268 max_sectors = mddev->resync_max_sectors; 4269 else 4270 max_sectors = mddev->dev_sectors; 4271 4272 resync = mddev->curr_resync_completed; 4273 return sprintf(page, "%llu / %llu\n", resync, max_sectors); 4274 } 4275 4276 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); 4277 4278 static ssize_t 4279 min_sync_show(struct mddev *mddev, char *page) 4280 { 4281 return sprintf(page, "%llu\n", 4282 (unsigned long long)mddev->resync_min); 4283 } 4284 static ssize_t 4285 min_sync_store(struct mddev *mddev, const char *buf, size_t len) 4286 { 4287 unsigned long long min; 4288 if (strict_strtoull(buf, 10, &min)) 4289 return -EINVAL; 4290 if (min > mddev->resync_max) 4291 return -EINVAL; 4292 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4293 return -EBUSY; 4294 4295 /* Must be a multiple of chunk_size */ 4296 if (mddev->chunk_sectors) { 4297 sector_t temp = min; 4298 if (sector_div(temp, mddev->chunk_sectors)) 4299 return -EINVAL; 4300 } 4301 mddev->resync_min = min; 4302 4303 return len; 4304 } 4305 4306 static struct md_sysfs_entry md_min_sync = 4307 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); 4308 4309 static ssize_t 4310 max_sync_show(struct mddev *mddev, char *page) 4311 { 4312 if (mddev->resync_max == MaxSector) 4313 return sprintf(page, "max\n"); 4314 else 4315 return sprintf(page, "%llu\n", 4316 (unsigned long long)mddev->resync_max); 4317 } 4318 static ssize_t 4319 max_sync_store(struct mddev *mddev, const char *buf, size_t len) 4320 { 4321 if (strncmp(buf, "max", 3) == 0) 4322 mddev->resync_max = MaxSector; 4323 else { 4324 unsigned long long max; 4325 if (strict_strtoull(buf, 10, &max)) 4326 return -EINVAL; 4327 if (max < mddev->resync_min) 4328 return -EINVAL; 4329 if (max < mddev->resync_max && 4330 mddev->ro == 0 && 4331 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 4332 return -EBUSY; 4333 4334 /* Must be a multiple of chunk_size */ 4335 if (mddev->chunk_sectors) { 4336 sector_t temp = max; 4337 if (sector_div(temp, mddev->chunk_sectors)) 4338 return -EINVAL; 4339 } 4340 mddev->resync_max = max; 4341 } 4342 wake_up(&mddev->recovery_wait); 4343 return len; 4344 } 4345 4346 static struct md_sysfs_entry md_max_sync = 4347 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); 4348 4349 static ssize_t 4350 suspend_lo_show(struct mddev *mddev, char *page) 4351 { 4352 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); 4353 } 4354 4355 static ssize_t 4356 suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) 4357 { 4358 char *e; 4359 unsigned long long new = simple_strtoull(buf, &e, 10); 4360 unsigned long long old = mddev->suspend_lo; 4361 4362 if (mddev->pers == NULL || 4363 mddev->pers->quiesce == NULL) 4364 return -EINVAL; 4365 if (buf == e || (*e && *e != '\n')) 4366 return -EINVAL; 4367 4368 mddev->suspend_lo = new; 4369 if (new >= old) 4370 /* Shrinking suspended region */ 4371 mddev->pers->quiesce(mddev, 2); 4372 else { 4373 /* Expanding suspended region - need to wait */ 4374 mddev->pers->quiesce(mddev, 1); 4375 mddev->pers->quiesce(mddev, 0); 4376 } 4377 return len; 4378 } 4379 static struct md_sysfs_entry md_suspend_lo = 4380 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); 4381 4382 4383 static ssize_t 4384 suspend_hi_show(struct mddev *mddev, char *page) 4385 { 4386 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); 4387 } 4388 4389 static ssize_t 4390 suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) 4391 { 4392 char *e; 4393 unsigned long long new = simple_strtoull(buf, &e, 10); 4394 unsigned long long old = mddev->suspend_hi; 4395 4396 if (mddev->pers == NULL || 4397 mddev->pers->quiesce == NULL) 4398 return -EINVAL; 4399 if (buf == e || (*e && *e != '\n')) 4400 return -EINVAL; 4401 4402 mddev->suspend_hi = new; 4403 if (new <= old) 4404 /* Shrinking suspended region */ 4405 mddev->pers->quiesce(mddev, 2); 4406 else { 4407 /* Expanding suspended region - need to wait */ 4408 mddev->pers->quiesce(mddev, 1); 4409 mddev->pers->quiesce(mddev, 0); 4410 } 4411 return len; 4412 } 4413 static struct md_sysfs_entry md_suspend_hi = 4414 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); 4415 4416 static ssize_t 4417 reshape_position_show(struct mddev *mddev, char *page) 4418 { 4419 if (mddev->reshape_position != MaxSector) 4420 return sprintf(page, "%llu\n", 4421 (unsigned long long)mddev->reshape_position); 4422 strcpy(page, "none\n"); 4423 return 5; 4424 } 4425 4426 static ssize_t 4427 reshape_position_store(struct mddev *mddev, const char *buf, size_t len) 4428 { 4429 char *e; 4430 unsigned long long new = simple_strtoull(buf, &e, 10); 4431 if (mddev->pers) 4432 return -EBUSY; 4433 if (buf == e || (*e && *e != '\n')) 4434 return -EINVAL; 4435 mddev->reshape_position = new; 4436 mddev->delta_disks = 0; 4437 mddev->new_level = mddev->level; 4438 mddev->new_layout = mddev->layout; 4439 mddev->new_chunk_sectors = mddev->chunk_sectors; 4440 return len; 4441 } 4442 4443 static struct md_sysfs_entry md_reshape_position = 4444 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, 4445 reshape_position_store); 4446 4447 static ssize_t 4448 array_size_show(struct mddev *mddev, char *page) 4449 { 4450 if (mddev->external_size) 4451 return sprintf(page, "%llu\n", 4452 (unsigned long long)mddev->array_sectors/2); 4453 else 4454 return sprintf(page, "default\n"); 4455 } 4456 4457 static ssize_t 4458 array_size_store(struct mddev *mddev, const char *buf, size_t len) 4459 { 4460 sector_t sectors; 4461 4462 if (strncmp(buf, "default", 7) == 0) { 4463 if (mddev->pers) 4464 sectors = mddev->pers->size(mddev, 0, 0); 4465 else 4466 sectors = mddev->array_sectors; 4467 4468 mddev->external_size = 0; 4469 } else { 4470 if (strict_blocks_to_sectors(buf, §ors) < 0) 4471 return -EINVAL; 4472 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) 4473 return -E2BIG; 4474 4475 mddev->external_size = 1; 4476 } 4477 4478 mddev->array_sectors = sectors; 4479 if (mddev->pers) { 4480 set_capacity(mddev->gendisk, mddev->array_sectors); 4481 revalidate_disk(mddev->gendisk); 4482 } 4483 return len; 4484 } 4485 4486 static struct md_sysfs_entry md_array_size = 4487 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, 4488 array_size_store); 4489 4490 static struct attribute *md_default_attrs[] = { 4491 &md_level.attr, 4492 &md_layout.attr, 4493 &md_raid_disks.attr, 4494 &md_chunk_size.attr, 4495 &md_size.attr, 4496 &md_resync_start.attr, 4497 &md_metadata.attr, 4498 &md_new_device.attr, 4499 &md_safe_delay.attr, 4500 &md_array_state.attr, 4501 &md_reshape_position.attr, 4502 &md_array_size.attr, 4503 &max_corr_read_errors.attr, 4504 NULL, 4505 }; 4506 4507 static struct attribute *md_redundancy_attrs[] = { 4508 &md_scan_mode.attr, 4509 &md_mismatches.attr, 4510 &md_sync_min.attr, 4511 &md_sync_max.attr, 4512 &md_sync_speed.attr, 4513 &md_sync_force_parallel.attr, 4514 &md_sync_completed.attr, 4515 &md_min_sync.attr, 4516 &md_max_sync.attr, 4517 &md_suspend_lo.attr, 4518 &md_suspend_hi.attr, 4519 &md_bitmap.attr, 4520 &md_degraded.attr, 4521 NULL, 4522 }; 4523 static struct attribute_group md_redundancy_group = { 4524 .name = NULL, 4525 .attrs = md_redundancy_attrs, 4526 }; 4527 4528 4529 static ssize_t 4530 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 4531 { 4532 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 4533 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 4534 ssize_t rv; 4535 4536 if (!entry->show) 4537 return -EIO; 4538 spin_lock(&all_mddevs_lock); 4539 if (list_empty(&mddev->all_mddevs)) { 4540 spin_unlock(&all_mddevs_lock); 4541 return -EBUSY; 4542 } 4543 mddev_get(mddev); 4544 spin_unlock(&all_mddevs_lock); 4545 4546 rv = mddev_lock(mddev); 4547 if (!rv) { 4548 rv = entry->show(mddev, page); 4549 mddev_unlock(mddev); 4550 } 4551 mddev_put(mddev); 4552 return rv; 4553 } 4554 4555 static ssize_t 4556 md_attr_store(struct kobject *kobj, struct attribute *attr, 4557 const char *page, size_t length) 4558 { 4559 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 4560 struct mddev *mddev = container_of(kobj, struct mddev, kobj); 4561 ssize_t rv; 4562 4563 if (!entry->store) 4564 return -EIO; 4565 if (!capable(CAP_SYS_ADMIN)) 4566 return -EACCES; 4567 spin_lock(&all_mddevs_lock); 4568 if (list_empty(&mddev->all_mddevs)) { 4569 spin_unlock(&all_mddevs_lock); 4570 return -EBUSY; 4571 } 4572 mddev_get(mddev); 4573 spin_unlock(&all_mddevs_lock); 4574 rv = mddev_lock(mddev); 4575 if (!rv) { 4576 rv = entry->store(mddev, page, length); 4577 mddev_unlock(mddev); 4578 } 4579 mddev_put(mddev); 4580 return rv; 4581 } 4582 4583 static void md_free(struct kobject *ko) 4584 { 4585 struct mddev *mddev = container_of(ko, struct mddev, kobj); 4586 4587 if (mddev->sysfs_state) 4588 sysfs_put(mddev->sysfs_state); 4589 4590 if (mddev->gendisk) { 4591 del_gendisk(mddev->gendisk); 4592 put_disk(mddev->gendisk); 4593 } 4594 if (mddev->queue) 4595 blk_cleanup_queue(mddev->queue); 4596 4597 kfree(mddev); 4598 } 4599 4600 static const struct sysfs_ops md_sysfs_ops = { 4601 .show = md_attr_show, 4602 .store = md_attr_store, 4603 }; 4604 static struct kobj_type md_ktype = { 4605 .release = md_free, 4606 .sysfs_ops = &md_sysfs_ops, 4607 .default_attrs = md_default_attrs, 4608 }; 4609 4610 int mdp_major = 0; 4611 4612 static void mddev_delayed_delete(struct work_struct *ws) 4613 { 4614 struct mddev *mddev = container_of(ws, struct mddev, del_work); 4615 4616 sysfs_remove_group(&mddev->kobj, &md_bitmap_group); 4617 kobject_del(&mddev->kobj); 4618 kobject_put(&mddev->kobj); 4619 } 4620 4621 static int md_alloc(dev_t dev, char *name) 4622 { 4623 static DEFINE_MUTEX(disks_mutex); 4624 struct mddev *mddev = mddev_find(dev); 4625 struct gendisk *disk; 4626 int partitioned; 4627 int shift; 4628 int unit; 4629 int error; 4630 4631 if (!mddev) 4632 return -ENODEV; 4633 4634 partitioned = (MAJOR(mddev->unit) != MD_MAJOR); 4635 shift = partitioned ? MdpMinorShift : 0; 4636 unit = MINOR(mddev->unit) >> shift; 4637 4638 /* wait for any previous instance of this device to be 4639 * completely removed (mddev_delayed_delete). 4640 */ 4641 flush_workqueue(md_misc_wq); 4642 4643 mutex_lock(&disks_mutex); 4644 error = -EEXIST; 4645 if (mddev->gendisk) 4646 goto abort; 4647 4648 if (name) { 4649 /* Need to ensure that 'name' is not a duplicate. 4650 */ 4651 struct mddev *mddev2; 4652 spin_lock(&all_mddevs_lock); 4653 4654 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) 4655 if (mddev2->gendisk && 4656 strcmp(mddev2->gendisk->disk_name, name) == 0) { 4657 spin_unlock(&all_mddevs_lock); 4658 goto abort; 4659 } 4660 spin_unlock(&all_mddevs_lock); 4661 } 4662 4663 error = -ENOMEM; 4664 mddev->queue = blk_alloc_queue(GFP_KERNEL); 4665 if (!mddev->queue) 4666 goto abort; 4667 mddev->queue->queuedata = mddev; 4668 4669 blk_queue_make_request(mddev->queue, md_make_request); 4670 blk_set_stacking_limits(&mddev->queue->limits); 4671 4672 disk = alloc_disk(1 << shift); 4673 if (!disk) { 4674 blk_cleanup_queue(mddev->queue); 4675 mddev->queue = NULL; 4676 goto abort; 4677 } 4678 disk->major = MAJOR(mddev->unit); 4679 disk->first_minor = unit << shift; 4680 if (name) 4681 strcpy(disk->disk_name, name); 4682 else if (partitioned) 4683 sprintf(disk->disk_name, "md_d%d", unit); 4684 else 4685 sprintf(disk->disk_name, "md%d", unit); 4686 disk->fops = &md_fops; 4687 disk->private_data = mddev; 4688 disk->queue = mddev->queue; 4689 blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); 4690 /* Allow extended partitions. This makes the 4691 * 'mdp' device redundant, but we can't really 4692 * remove it now. 4693 */ 4694 disk->flags |= GENHD_FL_EXT_DEVT; 4695 mddev->gendisk = disk; 4696 /* As soon as we call add_disk(), another thread could get 4697 * through to md_open, so make sure it doesn't get too far 4698 */ 4699 mutex_lock(&mddev->open_mutex); 4700 add_disk(disk); 4701 4702 error = kobject_init_and_add(&mddev->kobj, &md_ktype, 4703 &disk_to_dev(disk)->kobj, "%s", "md"); 4704 if (error) { 4705 /* This isn't possible, but as kobject_init_and_add is marked 4706 * __must_check, we must do something with the result 4707 */ 4708 printk(KERN_WARNING "md: cannot register %s/md - name in use\n", 4709 disk->disk_name); 4710 error = 0; 4711 } 4712 if (mddev->kobj.sd && 4713 sysfs_create_group(&mddev->kobj, &md_bitmap_group)) 4714 printk(KERN_DEBUG "pointless warning\n"); 4715 mutex_unlock(&mddev->open_mutex); 4716 abort: 4717 mutex_unlock(&disks_mutex); 4718 if (!error && mddev->kobj.sd) { 4719 kobject_uevent(&mddev->kobj, KOBJ_ADD); 4720 mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); 4721 } 4722 mddev_put(mddev); 4723 return error; 4724 } 4725 4726 static struct kobject *md_probe(dev_t dev, int *part, void *data) 4727 { 4728 md_alloc(dev, NULL); 4729 return NULL; 4730 } 4731 4732 static int add_named_array(const char *val, struct kernel_param *kp) 4733 { 4734 /* val must be "md_*" where * is not all digits. 4735 * We allocate an array with a large free minor number, and 4736 * set the name to val. val must not already be an active name. 4737 */ 4738 int len = strlen(val); 4739 char buf[DISK_NAME_LEN]; 4740 4741 while (len && val[len-1] == '\n') 4742 len--; 4743 if (len >= DISK_NAME_LEN) 4744 return -E2BIG; 4745 strlcpy(buf, val, len+1); 4746 if (strncmp(buf, "md_", 3) != 0) 4747 return -EINVAL; 4748 return md_alloc(0, buf); 4749 } 4750 4751 static void md_safemode_timeout(unsigned long data) 4752 { 4753 struct mddev *mddev = (struct mddev *) data; 4754 4755 if (!atomic_read(&mddev->writes_pending)) { 4756 mddev->safemode = 1; 4757 if (mddev->external) 4758 sysfs_notify_dirent_safe(mddev->sysfs_state); 4759 } 4760 md_wakeup_thread(mddev->thread); 4761 } 4762 4763 static int start_dirty_degraded; 4764 4765 int md_run(struct mddev *mddev) 4766 { 4767 int err; 4768 struct md_rdev *rdev; 4769 struct md_personality *pers; 4770 4771 if (list_empty(&mddev->disks)) 4772 /* cannot run an array with no devices.. */ 4773 return -EINVAL; 4774 4775 if (mddev->pers) 4776 return -EBUSY; 4777 /* Cannot run until previous stop completes properly */ 4778 if (mddev->sysfs_active) 4779 return -EBUSY; 4780 4781 /* 4782 * Analyze all RAID superblock(s) 4783 */ 4784 if (!mddev->raid_disks) { 4785 if (!mddev->persistent) 4786 return -EINVAL; 4787 analyze_sbs(mddev); 4788 } 4789 4790 if (mddev->level != LEVEL_NONE) 4791 request_module("md-level-%d", mddev->level); 4792 else if (mddev->clevel[0]) 4793 request_module("md-%s", mddev->clevel); 4794 4795 /* 4796 * Drop all container device buffers, from now on 4797 * the only valid external interface is through the md 4798 * device. 4799 */ 4800 rdev_for_each(rdev, mddev) { 4801 if (test_bit(Faulty, &rdev->flags)) 4802 continue; 4803 sync_blockdev(rdev->bdev); 4804 invalidate_bdev(rdev->bdev); 4805 4806 /* perform some consistency tests on the device. 4807 * We don't want the data to overlap the metadata, 4808 * Internal Bitmap issues have been handled elsewhere. 4809 */ 4810 if (rdev->meta_bdev) { 4811 /* Nothing to check */; 4812 } else if (rdev->data_offset < rdev->sb_start) { 4813 if (mddev->dev_sectors && 4814 rdev->data_offset + mddev->dev_sectors 4815 > rdev->sb_start) { 4816 printk("md: %s: data overlaps metadata\n", 4817 mdname(mddev)); 4818 return -EINVAL; 4819 } 4820 } else { 4821 if (rdev->sb_start + rdev->sb_size/512 4822 > rdev->data_offset) { 4823 printk("md: %s: metadata overlaps data\n", 4824 mdname(mddev)); 4825 return -EINVAL; 4826 } 4827 } 4828 sysfs_notify_dirent_safe(rdev->sysfs_state); 4829 } 4830 4831 if (mddev->bio_set == NULL) 4832 mddev->bio_set = bioset_create(BIO_POOL_SIZE, 4833 sizeof(struct mddev *)); 4834 4835 spin_lock(&pers_lock); 4836 pers = find_pers(mddev->level, mddev->clevel); 4837 if (!pers || !try_module_get(pers->owner)) { 4838 spin_unlock(&pers_lock); 4839 if (mddev->level != LEVEL_NONE) 4840 printk(KERN_WARNING "md: personality for level %d is not loaded!\n", 4841 mddev->level); 4842 else 4843 printk(KERN_WARNING "md: personality for level %s is not loaded!\n", 4844 mddev->clevel); 4845 return -EINVAL; 4846 } 4847 mddev->pers = pers; 4848 spin_unlock(&pers_lock); 4849 if (mddev->level != pers->level) { 4850 mddev->level = pers->level; 4851 mddev->new_level = pers->level; 4852 } 4853 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 4854 4855 if (mddev->reshape_position != MaxSector && 4856 pers->start_reshape == NULL) { 4857 /* This personality cannot handle reshaping... */ 4858 mddev->pers = NULL; 4859 module_put(pers->owner); 4860 return -EINVAL; 4861 } 4862 4863 if (pers->sync_request) { 4864 /* Warn if this is a potentially silly 4865 * configuration. 4866 */ 4867 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 4868 struct md_rdev *rdev2; 4869 int warned = 0; 4870 4871 rdev_for_each(rdev, mddev) 4872 rdev_for_each(rdev2, mddev) { 4873 if (rdev < rdev2 && 4874 rdev->bdev->bd_contains == 4875 rdev2->bdev->bd_contains) { 4876 printk(KERN_WARNING 4877 "%s: WARNING: %s appears to be" 4878 " on the same physical disk as" 4879 " %s.\n", 4880 mdname(mddev), 4881 bdevname(rdev->bdev,b), 4882 bdevname(rdev2->bdev,b2)); 4883 warned = 1; 4884 } 4885 } 4886 4887 if (warned) 4888 printk(KERN_WARNING 4889 "True protection against single-disk" 4890 " failure might be compromised.\n"); 4891 } 4892 4893 mddev->recovery = 0; 4894 /* may be over-ridden by personality */ 4895 mddev->resync_max_sectors = mddev->dev_sectors; 4896 4897 mddev->ok_start_degraded = start_dirty_degraded; 4898 4899 if (start_readonly && mddev->ro == 0) 4900 mddev->ro = 2; /* read-only, but switch on first write */ 4901 4902 err = mddev->pers->run(mddev); 4903 if (err) 4904 printk(KERN_ERR "md: pers->run() failed ...\n"); 4905 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { 4906 WARN_ONCE(!mddev->external_size, "%s: default size too small," 4907 " but 'external_size' not in effect?\n", __func__); 4908 printk(KERN_ERR 4909 "md: invalid array_size %llu > default size %llu\n", 4910 (unsigned long long)mddev->array_sectors / 2, 4911 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); 4912 err = -EINVAL; 4913 mddev->pers->stop(mddev); 4914 } 4915 if (err == 0 && mddev->pers->sync_request) { 4916 err = bitmap_create(mddev); 4917 if (err) { 4918 printk(KERN_ERR "%s: failed to create bitmap (%d)\n", 4919 mdname(mddev), err); 4920 mddev->pers->stop(mddev); 4921 } 4922 } 4923 if (err) { 4924 module_put(mddev->pers->owner); 4925 mddev->pers = NULL; 4926 bitmap_destroy(mddev); 4927 return err; 4928 } 4929 if (mddev->pers->sync_request) { 4930 if (mddev->kobj.sd && 4931 sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 4932 printk(KERN_WARNING 4933 "md: cannot register extra attributes for %s\n", 4934 mdname(mddev)); 4935 mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); 4936 } else if (mddev->ro == 2) /* auto-readonly not meaningful */ 4937 mddev->ro = 0; 4938 4939 atomic_set(&mddev->writes_pending,0); 4940 atomic_set(&mddev->max_corr_read_errors, 4941 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); 4942 mddev->safemode = 0; 4943 mddev->safemode_timer.function = md_safemode_timeout; 4944 mddev->safemode_timer.data = (unsigned long) mddev; 4945 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ 4946 mddev->in_sync = 1; 4947 smp_wmb(); 4948 mddev->ready = 1; 4949 rdev_for_each(rdev, mddev) 4950 if (rdev->raid_disk >= 0) 4951 if (sysfs_link_rdev(mddev, rdev)) 4952 /* failure here is OK */; 4953 4954 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4955 4956 if (mddev->flags) 4957 md_update_sb(mddev, 0); 4958 4959 md_new_event(mddev); 4960 sysfs_notify_dirent_safe(mddev->sysfs_state); 4961 sysfs_notify_dirent_safe(mddev->sysfs_action); 4962 sysfs_notify(&mddev->kobj, NULL, "degraded"); 4963 return 0; 4964 } 4965 EXPORT_SYMBOL_GPL(md_run); 4966 4967 static int do_md_run(struct mddev *mddev) 4968 { 4969 int err; 4970 4971 err = md_run(mddev); 4972 if (err) 4973 goto out; 4974 err = bitmap_load(mddev); 4975 if (err) { 4976 bitmap_destroy(mddev); 4977 goto out; 4978 } 4979 4980 md_wakeup_thread(mddev->thread); 4981 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 4982 4983 set_capacity(mddev->gendisk, mddev->array_sectors); 4984 revalidate_disk(mddev->gendisk); 4985 mddev->changed = 1; 4986 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 4987 out: 4988 return err; 4989 } 4990 4991 static int restart_array(struct mddev *mddev) 4992 { 4993 struct gendisk *disk = mddev->gendisk; 4994 4995 /* Complain if it has no devices */ 4996 if (list_empty(&mddev->disks)) 4997 return -ENXIO; 4998 if (!mddev->pers) 4999 return -EINVAL; 5000 if (!mddev->ro) 5001 return -EBUSY; 5002 mddev->safemode = 0; 5003 mddev->ro = 0; 5004 set_disk_ro(disk, 0); 5005 printk(KERN_INFO "md: %s switched to read-write mode.\n", 5006 mdname(mddev)); 5007 /* Kick recovery or resync if necessary */ 5008 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5009 md_wakeup_thread(mddev->thread); 5010 md_wakeup_thread(mddev->sync_thread); 5011 sysfs_notify_dirent_safe(mddev->sysfs_state); 5012 return 0; 5013 } 5014 5015 /* similar to deny_write_access, but accounts for our holding a reference 5016 * to the file ourselves */ 5017 static int deny_bitmap_write_access(struct file * file) 5018 { 5019 struct inode *inode = file->f_mapping->host; 5020 5021 spin_lock(&inode->i_lock); 5022 if (atomic_read(&inode->i_writecount) > 1) { 5023 spin_unlock(&inode->i_lock); 5024 return -ETXTBSY; 5025 } 5026 atomic_set(&inode->i_writecount, -1); 5027 spin_unlock(&inode->i_lock); 5028 5029 return 0; 5030 } 5031 5032 void restore_bitmap_write_access(struct file *file) 5033 { 5034 struct inode *inode = file->f_mapping->host; 5035 5036 spin_lock(&inode->i_lock); 5037 atomic_set(&inode->i_writecount, 1); 5038 spin_unlock(&inode->i_lock); 5039 } 5040 5041 static void md_clean(struct mddev *mddev) 5042 { 5043 mddev->array_sectors = 0; 5044 mddev->external_size = 0; 5045 mddev->dev_sectors = 0; 5046 mddev->raid_disks = 0; 5047 mddev->recovery_cp = 0; 5048 mddev->resync_min = 0; 5049 mddev->resync_max = MaxSector; 5050 mddev->reshape_position = MaxSector; 5051 mddev->external = 0; 5052 mddev->persistent = 0; 5053 mddev->level = LEVEL_NONE; 5054 mddev->clevel[0] = 0; 5055 mddev->flags = 0; 5056 mddev->ro = 0; 5057 mddev->metadata_type[0] = 0; 5058 mddev->chunk_sectors = 0; 5059 mddev->ctime = mddev->utime = 0; 5060 mddev->layout = 0; 5061 mddev->max_disks = 0; 5062 mddev->events = 0; 5063 mddev->can_decrease_events = 0; 5064 mddev->delta_disks = 0; 5065 mddev->new_level = LEVEL_NONE; 5066 mddev->new_layout = 0; 5067 mddev->new_chunk_sectors = 0; 5068 mddev->curr_resync = 0; 5069 mddev->resync_mismatches = 0; 5070 mddev->suspend_lo = mddev->suspend_hi = 0; 5071 mddev->sync_speed_min = mddev->sync_speed_max = 0; 5072 mddev->recovery = 0; 5073 mddev->in_sync = 0; 5074 mddev->changed = 0; 5075 mddev->degraded = 0; 5076 mddev->safemode = 0; 5077 mddev->merge_check_needed = 0; 5078 mddev->bitmap_info.offset = 0; 5079 mddev->bitmap_info.default_offset = 0; 5080 mddev->bitmap_info.chunksize = 0; 5081 mddev->bitmap_info.daemon_sleep = 0; 5082 mddev->bitmap_info.max_write_behind = 0; 5083 } 5084 5085 static void __md_stop_writes(struct mddev *mddev) 5086 { 5087 if (mddev->sync_thread) { 5088 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5089 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5090 reap_sync_thread(mddev); 5091 } 5092 5093 del_timer_sync(&mddev->safemode_timer); 5094 5095 bitmap_flush(mddev); 5096 md_super_wait(mddev); 5097 5098 if (!mddev->in_sync || mddev->flags) { 5099 /* mark array as shutdown cleanly */ 5100 mddev->in_sync = 1; 5101 md_update_sb(mddev, 1); 5102 } 5103 } 5104 5105 void md_stop_writes(struct mddev *mddev) 5106 { 5107 mddev_lock(mddev); 5108 __md_stop_writes(mddev); 5109 mddev_unlock(mddev); 5110 } 5111 EXPORT_SYMBOL_GPL(md_stop_writes); 5112 5113 void md_stop(struct mddev *mddev) 5114 { 5115 mddev->ready = 0; 5116 mddev->pers->stop(mddev); 5117 if (mddev->pers->sync_request && mddev->to_remove == NULL) 5118 mddev->to_remove = &md_redundancy_group; 5119 module_put(mddev->pers->owner); 5120 mddev->pers = NULL; 5121 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5122 } 5123 EXPORT_SYMBOL_GPL(md_stop); 5124 5125 static int md_set_readonly(struct mddev *mddev, int is_open) 5126 { 5127 int err = 0; 5128 mutex_lock(&mddev->open_mutex); 5129 if (atomic_read(&mddev->openers) > is_open) { 5130 printk("md: %s still in use.\n",mdname(mddev)); 5131 err = -EBUSY; 5132 goto out; 5133 } 5134 if (mddev->pers) { 5135 __md_stop_writes(mddev); 5136 5137 err = -ENXIO; 5138 if (mddev->ro==1) 5139 goto out; 5140 mddev->ro = 1; 5141 set_disk_ro(mddev->gendisk, 1); 5142 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 5143 sysfs_notify_dirent_safe(mddev->sysfs_state); 5144 err = 0; 5145 } 5146 out: 5147 mutex_unlock(&mddev->open_mutex); 5148 return err; 5149 } 5150 5151 /* mode: 5152 * 0 - completely stop and dis-assemble array 5153 * 2 - stop but do not disassemble array 5154 */ 5155 static int do_md_stop(struct mddev * mddev, int mode, int is_open) 5156 { 5157 struct gendisk *disk = mddev->gendisk; 5158 struct md_rdev *rdev; 5159 5160 mutex_lock(&mddev->open_mutex); 5161 if (atomic_read(&mddev->openers) > is_open || 5162 mddev->sysfs_active) { 5163 printk("md: %s still in use.\n",mdname(mddev)); 5164 mutex_unlock(&mddev->open_mutex); 5165 return -EBUSY; 5166 } 5167 5168 if (mddev->pers) { 5169 if (mddev->ro) 5170 set_disk_ro(disk, 0); 5171 5172 __md_stop_writes(mddev); 5173 md_stop(mddev); 5174 mddev->queue->merge_bvec_fn = NULL; 5175 mddev->queue->backing_dev_info.congested_fn = NULL; 5176 5177 /* tell userspace to handle 'inactive' */ 5178 sysfs_notify_dirent_safe(mddev->sysfs_state); 5179 5180 rdev_for_each(rdev, mddev) 5181 if (rdev->raid_disk >= 0) 5182 sysfs_unlink_rdev(mddev, rdev); 5183 5184 set_capacity(disk, 0); 5185 mutex_unlock(&mddev->open_mutex); 5186 mddev->changed = 1; 5187 revalidate_disk(disk); 5188 5189 if (mddev->ro) 5190 mddev->ro = 0; 5191 } else 5192 mutex_unlock(&mddev->open_mutex); 5193 /* 5194 * Free resources if final stop 5195 */ 5196 if (mode == 0) { 5197 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); 5198 5199 bitmap_destroy(mddev); 5200 if (mddev->bitmap_info.file) { 5201 restore_bitmap_write_access(mddev->bitmap_info.file); 5202 fput(mddev->bitmap_info.file); 5203 mddev->bitmap_info.file = NULL; 5204 } 5205 mddev->bitmap_info.offset = 0; 5206 5207 export_array(mddev); 5208 5209 md_clean(mddev); 5210 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 5211 if (mddev->hold_active == UNTIL_STOP) 5212 mddev->hold_active = 0; 5213 } 5214 blk_integrity_unregister(disk); 5215 md_new_event(mddev); 5216 sysfs_notify_dirent_safe(mddev->sysfs_state); 5217 return 0; 5218 } 5219 5220 #ifndef MODULE 5221 static void autorun_array(struct mddev *mddev) 5222 { 5223 struct md_rdev *rdev; 5224 int err; 5225 5226 if (list_empty(&mddev->disks)) 5227 return; 5228 5229 printk(KERN_INFO "md: running: "); 5230 5231 rdev_for_each(rdev, mddev) { 5232 char b[BDEVNAME_SIZE]; 5233 printk("<%s>", bdevname(rdev->bdev,b)); 5234 } 5235 printk("\n"); 5236 5237 err = do_md_run(mddev); 5238 if (err) { 5239 printk(KERN_WARNING "md: do_md_run() returned %d\n", err); 5240 do_md_stop(mddev, 0, 0); 5241 } 5242 } 5243 5244 /* 5245 * lets try to run arrays based on all disks that have arrived 5246 * until now. (those are in pending_raid_disks) 5247 * 5248 * the method: pick the first pending disk, collect all disks with 5249 * the same UUID, remove all from the pending list and put them into 5250 * the 'same_array' list. Then order this list based on superblock 5251 * update time (freshest comes first), kick out 'old' disks and 5252 * compare superblocks. If everything's fine then run it. 5253 * 5254 * If "unit" is allocated, then bump its reference count 5255 */ 5256 static void autorun_devices(int part) 5257 { 5258 struct md_rdev *rdev0, *rdev, *tmp; 5259 struct mddev *mddev; 5260 char b[BDEVNAME_SIZE]; 5261 5262 printk(KERN_INFO "md: autorun ...\n"); 5263 while (!list_empty(&pending_raid_disks)) { 5264 int unit; 5265 dev_t dev; 5266 LIST_HEAD(candidates); 5267 rdev0 = list_entry(pending_raid_disks.next, 5268 struct md_rdev, same_set); 5269 5270 printk(KERN_INFO "md: considering %s ...\n", 5271 bdevname(rdev0->bdev,b)); 5272 INIT_LIST_HEAD(&candidates); 5273 rdev_for_each_list(rdev, tmp, &pending_raid_disks) 5274 if (super_90_load(rdev, rdev0, 0) >= 0) { 5275 printk(KERN_INFO "md: adding %s ...\n", 5276 bdevname(rdev->bdev,b)); 5277 list_move(&rdev->same_set, &candidates); 5278 } 5279 /* 5280 * now we have a set of devices, with all of them having 5281 * mostly sane superblocks. It's time to allocate the 5282 * mddev. 5283 */ 5284 if (part) { 5285 dev = MKDEV(mdp_major, 5286 rdev0->preferred_minor << MdpMinorShift); 5287 unit = MINOR(dev) >> MdpMinorShift; 5288 } else { 5289 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 5290 unit = MINOR(dev); 5291 } 5292 if (rdev0->preferred_minor != unit) { 5293 printk(KERN_INFO "md: unit number in %s is bad: %d\n", 5294 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 5295 break; 5296 } 5297 5298 md_probe(dev, NULL, NULL); 5299 mddev = mddev_find(dev); 5300 if (!mddev || !mddev->gendisk) { 5301 if (mddev) 5302 mddev_put(mddev); 5303 printk(KERN_ERR 5304 "md: cannot allocate memory for md drive.\n"); 5305 break; 5306 } 5307 if (mddev_lock(mddev)) 5308 printk(KERN_WARNING "md: %s locked, cannot run\n", 5309 mdname(mddev)); 5310 else if (mddev->raid_disks || mddev->major_version 5311 || !list_empty(&mddev->disks)) { 5312 printk(KERN_WARNING 5313 "md: %s already running, cannot run %s\n", 5314 mdname(mddev), bdevname(rdev0->bdev,b)); 5315 mddev_unlock(mddev); 5316 } else { 5317 printk(KERN_INFO "md: created %s\n", mdname(mddev)); 5318 mddev->persistent = 1; 5319 rdev_for_each_list(rdev, tmp, &candidates) { 5320 list_del_init(&rdev->same_set); 5321 if (bind_rdev_to_array(rdev, mddev)) 5322 export_rdev(rdev); 5323 } 5324 autorun_array(mddev); 5325 mddev_unlock(mddev); 5326 } 5327 /* on success, candidates will be empty, on error 5328 * it won't... 5329 */ 5330 rdev_for_each_list(rdev, tmp, &candidates) { 5331 list_del_init(&rdev->same_set); 5332 export_rdev(rdev); 5333 } 5334 mddev_put(mddev); 5335 } 5336 printk(KERN_INFO "md: ... autorun DONE.\n"); 5337 } 5338 #endif /* !MODULE */ 5339 5340 static int get_version(void __user * arg) 5341 { 5342 mdu_version_t ver; 5343 5344 ver.major = MD_MAJOR_VERSION; 5345 ver.minor = MD_MINOR_VERSION; 5346 ver.patchlevel = MD_PATCHLEVEL_VERSION; 5347 5348 if (copy_to_user(arg, &ver, sizeof(ver))) 5349 return -EFAULT; 5350 5351 return 0; 5352 } 5353 5354 static int get_array_info(struct mddev * mddev, void __user * arg) 5355 { 5356 mdu_array_info_t info; 5357 int nr,working,insync,failed,spare; 5358 struct md_rdev *rdev; 5359 5360 nr=working=insync=failed=spare=0; 5361 rdev_for_each(rdev, mddev) { 5362 nr++; 5363 if (test_bit(Faulty, &rdev->flags)) 5364 failed++; 5365 else { 5366 working++; 5367 if (test_bit(In_sync, &rdev->flags)) 5368 insync++; 5369 else 5370 spare++; 5371 } 5372 } 5373 5374 info.major_version = mddev->major_version; 5375 info.minor_version = mddev->minor_version; 5376 info.patch_version = MD_PATCHLEVEL_VERSION; 5377 info.ctime = mddev->ctime; 5378 info.level = mddev->level; 5379 info.size = mddev->dev_sectors / 2; 5380 if (info.size != mddev->dev_sectors / 2) /* overflow */ 5381 info.size = -1; 5382 info.nr_disks = nr; 5383 info.raid_disks = mddev->raid_disks; 5384 info.md_minor = mddev->md_minor; 5385 info.not_persistent= !mddev->persistent; 5386 5387 info.utime = mddev->utime; 5388 info.state = 0; 5389 if (mddev->in_sync) 5390 info.state = (1<<MD_SB_CLEAN); 5391 if (mddev->bitmap && mddev->bitmap_info.offset) 5392 info.state = (1<<MD_SB_BITMAP_PRESENT); 5393 info.active_disks = insync; 5394 info.working_disks = working; 5395 info.failed_disks = failed; 5396 info.spare_disks = spare; 5397 5398 info.layout = mddev->layout; 5399 info.chunk_size = mddev->chunk_sectors << 9; 5400 5401 if (copy_to_user(arg, &info, sizeof(info))) 5402 return -EFAULT; 5403 5404 return 0; 5405 } 5406 5407 static int get_bitmap_file(struct mddev * mddev, void __user * arg) 5408 { 5409 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 5410 char *ptr, *buf = NULL; 5411 int err = -ENOMEM; 5412 5413 if (md_allow_write(mddev)) 5414 file = kmalloc(sizeof(*file), GFP_NOIO); 5415 else 5416 file = kmalloc(sizeof(*file), GFP_KERNEL); 5417 5418 if (!file) 5419 goto out; 5420 5421 /* bitmap disabled, zero the first byte and copy out */ 5422 if (!mddev->bitmap || !mddev->bitmap->file) { 5423 file->pathname[0] = '\0'; 5424 goto copy_out; 5425 } 5426 5427 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); 5428 if (!buf) 5429 goto out; 5430 5431 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); 5432 if (IS_ERR(ptr)) 5433 goto out; 5434 5435 strcpy(file->pathname, ptr); 5436 5437 copy_out: 5438 err = 0; 5439 if (copy_to_user(arg, file, sizeof(*file))) 5440 err = -EFAULT; 5441 out: 5442 kfree(buf); 5443 kfree(file); 5444 return err; 5445 } 5446 5447 static int get_disk_info(struct mddev * mddev, void __user * arg) 5448 { 5449 mdu_disk_info_t info; 5450 struct md_rdev *rdev; 5451 5452 if (copy_from_user(&info, arg, sizeof(info))) 5453 return -EFAULT; 5454 5455 rdev = find_rdev_nr(mddev, info.number); 5456 if (rdev) { 5457 info.major = MAJOR(rdev->bdev->bd_dev); 5458 info.minor = MINOR(rdev->bdev->bd_dev); 5459 info.raid_disk = rdev->raid_disk; 5460 info.state = 0; 5461 if (test_bit(Faulty, &rdev->flags)) 5462 info.state |= (1<<MD_DISK_FAULTY); 5463 else if (test_bit(In_sync, &rdev->flags)) { 5464 info.state |= (1<<MD_DISK_ACTIVE); 5465 info.state |= (1<<MD_DISK_SYNC); 5466 } 5467 if (test_bit(WriteMostly, &rdev->flags)) 5468 info.state |= (1<<MD_DISK_WRITEMOSTLY); 5469 } else { 5470 info.major = info.minor = 0; 5471 info.raid_disk = -1; 5472 info.state = (1<<MD_DISK_REMOVED); 5473 } 5474 5475 if (copy_to_user(arg, &info, sizeof(info))) 5476 return -EFAULT; 5477 5478 return 0; 5479 } 5480 5481 static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info) 5482 { 5483 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 5484 struct md_rdev *rdev; 5485 dev_t dev = MKDEV(info->major,info->minor); 5486 5487 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 5488 return -EOVERFLOW; 5489 5490 if (!mddev->raid_disks) { 5491 int err; 5492 /* expecting a device which has a superblock */ 5493 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 5494 if (IS_ERR(rdev)) { 5495 printk(KERN_WARNING 5496 "md: md_import_device returned %ld\n", 5497 PTR_ERR(rdev)); 5498 return PTR_ERR(rdev); 5499 } 5500 if (!list_empty(&mddev->disks)) { 5501 struct md_rdev *rdev0 5502 = list_entry(mddev->disks.next, 5503 struct md_rdev, same_set); 5504 err = super_types[mddev->major_version] 5505 .load_super(rdev, rdev0, mddev->minor_version); 5506 if (err < 0) { 5507 printk(KERN_WARNING 5508 "md: %s has different UUID to %s\n", 5509 bdevname(rdev->bdev,b), 5510 bdevname(rdev0->bdev,b2)); 5511 export_rdev(rdev); 5512 return -EINVAL; 5513 } 5514 } 5515 err = bind_rdev_to_array(rdev, mddev); 5516 if (err) 5517 export_rdev(rdev); 5518 return err; 5519 } 5520 5521 /* 5522 * add_new_disk can be used once the array is assembled 5523 * to add "hot spares". They must already have a superblock 5524 * written 5525 */ 5526 if (mddev->pers) { 5527 int err; 5528 if (!mddev->pers->hot_add_disk) { 5529 printk(KERN_WARNING 5530 "%s: personality does not support diskops!\n", 5531 mdname(mddev)); 5532 return -EINVAL; 5533 } 5534 if (mddev->persistent) 5535 rdev = md_import_device(dev, mddev->major_version, 5536 mddev->minor_version); 5537 else 5538 rdev = md_import_device(dev, -1, -1); 5539 if (IS_ERR(rdev)) { 5540 printk(KERN_WARNING 5541 "md: md_import_device returned %ld\n", 5542 PTR_ERR(rdev)); 5543 return PTR_ERR(rdev); 5544 } 5545 /* set saved_raid_disk if appropriate */ 5546 if (!mddev->persistent) { 5547 if (info->state & (1<<MD_DISK_SYNC) && 5548 info->raid_disk < mddev->raid_disks) { 5549 rdev->raid_disk = info->raid_disk; 5550 set_bit(In_sync, &rdev->flags); 5551 } else 5552 rdev->raid_disk = -1; 5553 } else 5554 super_types[mddev->major_version]. 5555 validate_super(mddev, rdev); 5556 if ((info->state & (1<<MD_DISK_SYNC)) && 5557 (!test_bit(In_sync, &rdev->flags) || 5558 rdev->raid_disk != info->raid_disk)) { 5559 /* This was a hot-add request, but events doesn't 5560 * match, so reject it. 5561 */ 5562 export_rdev(rdev); 5563 return -EINVAL; 5564 } 5565 5566 if (test_bit(In_sync, &rdev->flags)) 5567 rdev->saved_raid_disk = rdev->raid_disk; 5568 else 5569 rdev->saved_raid_disk = -1; 5570 5571 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 5572 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 5573 set_bit(WriteMostly, &rdev->flags); 5574 else 5575 clear_bit(WriteMostly, &rdev->flags); 5576 5577 rdev->raid_disk = -1; 5578 err = bind_rdev_to_array(rdev, mddev); 5579 if (!err && !mddev->pers->hot_remove_disk) { 5580 /* If there is hot_add_disk but no hot_remove_disk 5581 * then added disks for geometry changes, 5582 * and should be added immediately. 5583 */ 5584 super_types[mddev->major_version]. 5585 validate_super(mddev, rdev); 5586 err = mddev->pers->hot_add_disk(mddev, rdev); 5587 if (err) 5588 unbind_rdev_from_array(rdev); 5589 } 5590 if (err) 5591 export_rdev(rdev); 5592 else 5593 sysfs_notify_dirent_safe(rdev->sysfs_state); 5594 5595 md_update_sb(mddev, 1); 5596 if (mddev->degraded) 5597 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 5598 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5599 if (!err) 5600 md_new_event(mddev); 5601 md_wakeup_thread(mddev->thread); 5602 return err; 5603 } 5604 5605 /* otherwise, add_new_disk is only allowed 5606 * for major_version==0 superblocks 5607 */ 5608 if (mddev->major_version != 0) { 5609 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", 5610 mdname(mddev)); 5611 return -EINVAL; 5612 } 5613 5614 if (!(info->state & (1<<MD_DISK_FAULTY))) { 5615 int err; 5616 rdev = md_import_device(dev, -1, 0); 5617 if (IS_ERR(rdev)) { 5618 printk(KERN_WARNING 5619 "md: error, md_import_device() returned %ld\n", 5620 PTR_ERR(rdev)); 5621 return PTR_ERR(rdev); 5622 } 5623 rdev->desc_nr = info->number; 5624 if (info->raid_disk < mddev->raid_disks) 5625 rdev->raid_disk = info->raid_disk; 5626 else 5627 rdev->raid_disk = -1; 5628 5629 if (rdev->raid_disk < mddev->raid_disks) 5630 if (info->state & (1<<MD_DISK_SYNC)) 5631 set_bit(In_sync, &rdev->flags); 5632 5633 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 5634 set_bit(WriteMostly, &rdev->flags); 5635 5636 if (!mddev->persistent) { 5637 printk(KERN_INFO "md: nonpersistent superblock ...\n"); 5638 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 5639 } else 5640 rdev->sb_start = calc_dev_sboffset(rdev); 5641 rdev->sectors = rdev->sb_start; 5642 5643 err = bind_rdev_to_array(rdev, mddev); 5644 if (err) { 5645 export_rdev(rdev); 5646 return err; 5647 } 5648 } 5649 5650 return 0; 5651 } 5652 5653 static int hot_remove_disk(struct mddev * mddev, dev_t dev) 5654 { 5655 char b[BDEVNAME_SIZE]; 5656 struct md_rdev *rdev; 5657 5658 rdev = find_rdev(mddev, dev); 5659 if (!rdev) 5660 return -ENXIO; 5661 5662 if (rdev->raid_disk >= 0) 5663 goto busy; 5664 5665 kick_rdev_from_array(rdev); 5666 md_update_sb(mddev, 1); 5667 md_new_event(mddev); 5668 5669 return 0; 5670 busy: 5671 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", 5672 bdevname(rdev->bdev,b), mdname(mddev)); 5673 return -EBUSY; 5674 } 5675 5676 static int hot_add_disk(struct mddev * mddev, dev_t dev) 5677 { 5678 char b[BDEVNAME_SIZE]; 5679 int err; 5680 struct md_rdev *rdev; 5681 5682 if (!mddev->pers) 5683 return -ENODEV; 5684 5685 if (mddev->major_version != 0) { 5686 printk(KERN_WARNING "%s: HOT_ADD may only be used with" 5687 " version-0 superblocks.\n", 5688 mdname(mddev)); 5689 return -EINVAL; 5690 } 5691 if (!mddev->pers->hot_add_disk) { 5692 printk(KERN_WARNING 5693 "%s: personality does not support diskops!\n", 5694 mdname(mddev)); 5695 return -EINVAL; 5696 } 5697 5698 rdev = md_import_device(dev, -1, 0); 5699 if (IS_ERR(rdev)) { 5700 printk(KERN_WARNING 5701 "md: error, md_import_device() returned %ld\n", 5702 PTR_ERR(rdev)); 5703 return -EINVAL; 5704 } 5705 5706 if (mddev->persistent) 5707 rdev->sb_start = calc_dev_sboffset(rdev); 5708 else 5709 rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; 5710 5711 rdev->sectors = rdev->sb_start; 5712 5713 if (test_bit(Faulty, &rdev->flags)) { 5714 printk(KERN_WARNING 5715 "md: can not hot-add faulty %s disk to %s!\n", 5716 bdevname(rdev->bdev,b), mdname(mddev)); 5717 err = -EINVAL; 5718 goto abort_export; 5719 } 5720 clear_bit(In_sync, &rdev->flags); 5721 rdev->desc_nr = -1; 5722 rdev->saved_raid_disk = -1; 5723 err = bind_rdev_to_array(rdev, mddev); 5724 if (err) 5725 goto abort_export; 5726 5727 /* 5728 * The rest should better be atomic, we can have disk failures 5729 * noticed in interrupt contexts ... 5730 */ 5731 5732 rdev->raid_disk = -1; 5733 5734 md_update_sb(mddev, 1); 5735 5736 /* 5737 * Kick recovery, maybe this spare has to be added to the 5738 * array immediately. 5739 */ 5740 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5741 md_wakeup_thread(mddev->thread); 5742 md_new_event(mddev); 5743 return 0; 5744 5745 abort_export: 5746 export_rdev(rdev); 5747 return err; 5748 } 5749 5750 static int set_bitmap_file(struct mddev *mddev, int fd) 5751 { 5752 int err; 5753 5754 if (mddev->pers) { 5755 if (!mddev->pers->quiesce) 5756 return -EBUSY; 5757 if (mddev->recovery || mddev->sync_thread) 5758 return -EBUSY; 5759 /* we should be able to change the bitmap.. */ 5760 } 5761 5762 5763 if (fd >= 0) { 5764 if (mddev->bitmap) 5765 return -EEXIST; /* cannot add when bitmap is present */ 5766 mddev->bitmap_info.file = fget(fd); 5767 5768 if (mddev->bitmap_info.file == NULL) { 5769 printk(KERN_ERR "%s: error: failed to get bitmap file\n", 5770 mdname(mddev)); 5771 return -EBADF; 5772 } 5773 5774 err = deny_bitmap_write_access(mddev->bitmap_info.file); 5775 if (err) { 5776 printk(KERN_ERR "%s: error: bitmap file is already in use\n", 5777 mdname(mddev)); 5778 fput(mddev->bitmap_info.file); 5779 mddev->bitmap_info.file = NULL; 5780 return err; 5781 } 5782 mddev->bitmap_info.offset = 0; /* file overrides offset */ 5783 } else if (mddev->bitmap == NULL) 5784 return -ENOENT; /* cannot remove what isn't there */ 5785 err = 0; 5786 if (mddev->pers) { 5787 mddev->pers->quiesce(mddev, 1); 5788 if (fd >= 0) { 5789 err = bitmap_create(mddev); 5790 if (!err) 5791 err = bitmap_load(mddev); 5792 } 5793 if (fd < 0 || err) { 5794 bitmap_destroy(mddev); 5795 fd = -1; /* make sure to put the file */ 5796 } 5797 mddev->pers->quiesce(mddev, 0); 5798 } 5799 if (fd < 0) { 5800 if (mddev->bitmap_info.file) { 5801 restore_bitmap_write_access(mddev->bitmap_info.file); 5802 fput(mddev->bitmap_info.file); 5803 } 5804 mddev->bitmap_info.file = NULL; 5805 } 5806 5807 return err; 5808 } 5809 5810 /* 5811 * set_array_info is used two different ways 5812 * The original usage is when creating a new array. 5813 * In this usage, raid_disks is > 0 and it together with 5814 * level, size, not_persistent,layout,chunksize determine the 5815 * shape of the array. 5816 * This will always create an array with a type-0.90.0 superblock. 5817 * The newer usage is when assembling an array. 5818 * In this case raid_disks will be 0, and the major_version field is 5819 * use to determine which style super-blocks are to be found on the devices. 5820 * The minor and patch _version numbers are also kept incase the 5821 * super_block handler wishes to interpret them. 5822 */ 5823 static int set_array_info(struct mddev * mddev, mdu_array_info_t *info) 5824 { 5825 5826 if (info->raid_disks == 0) { 5827 /* just setting version number for superblock loading */ 5828 if (info->major_version < 0 || 5829 info->major_version >= ARRAY_SIZE(super_types) || 5830 super_types[info->major_version].name == NULL) { 5831 /* maybe try to auto-load a module? */ 5832 printk(KERN_INFO 5833 "md: superblock version %d not known\n", 5834 info->major_version); 5835 return -EINVAL; 5836 } 5837 mddev->major_version = info->major_version; 5838 mddev->minor_version = info->minor_version; 5839 mddev->patch_version = info->patch_version; 5840 mddev->persistent = !info->not_persistent; 5841 /* ensure mddev_put doesn't delete this now that there 5842 * is some minimal configuration. 5843 */ 5844 mddev->ctime = get_seconds(); 5845 return 0; 5846 } 5847 mddev->major_version = MD_MAJOR_VERSION; 5848 mddev->minor_version = MD_MINOR_VERSION; 5849 mddev->patch_version = MD_PATCHLEVEL_VERSION; 5850 mddev->ctime = get_seconds(); 5851 5852 mddev->level = info->level; 5853 mddev->clevel[0] = 0; 5854 mddev->dev_sectors = 2 * (sector_t)info->size; 5855 mddev->raid_disks = info->raid_disks; 5856 /* don't set md_minor, it is determined by which /dev/md* was 5857 * openned 5858 */ 5859 if (info->state & (1<<MD_SB_CLEAN)) 5860 mddev->recovery_cp = MaxSector; 5861 else 5862 mddev->recovery_cp = 0; 5863 mddev->persistent = ! info->not_persistent; 5864 mddev->external = 0; 5865 5866 mddev->layout = info->layout; 5867 mddev->chunk_sectors = info->chunk_size >> 9; 5868 5869 mddev->max_disks = MD_SB_DISKS; 5870 5871 if (mddev->persistent) 5872 mddev->flags = 0; 5873 set_bit(MD_CHANGE_DEVS, &mddev->flags); 5874 5875 mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; 5876 mddev->bitmap_info.offset = 0; 5877 5878 mddev->reshape_position = MaxSector; 5879 5880 /* 5881 * Generate a 128 bit UUID 5882 */ 5883 get_random_bytes(mddev->uuid, 16); 5884 5885 mddev->new_level = mddev->level; 5886 mddev->new_chunk_sectors = mddev->chunk_sectors; 5887 mddev->new_layout = mddev->layout; 5888 mddev->delta_disks = 0; 5889 5890 return 0; 5891 } 5892 5893 void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) 5894 { 5895 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); 5896 5897 if (mddev->external_size) 5898 return; 5899 5900 mddev->array_sectors = array_sectors; 5901 } 5902 EXPORT_SYMBOL(md_set_array_sectors); 5903 5904 static int update_size(struct mddev *mddev, sector_t num_sectors) 5905 { 5906 struct md_rdev *rdev; 5907 int rv; 5908 int fit = (num_sectors == 0); 5909 5910 if (mddev->pers->resize == NULL) 5911 return -EINVAL; 5912 /* The "num_sectors" is the number of sectors of each device that 5913 * is used. This can only make sense for arrays with redundancy. 5914 * linear and raid0 always use whatever space is available. We can only 5915 * consider changing this number if no resync or reconstruction is 5916 * happening, and if the new size is acceptable. It must fit before the 5917 * sb_start or, if that is <data_offset, it must fit before the size 5918 * of each device. If num_sectors is zero, we find the largest size 5919 * that fits. 5920 */ 5921 if (mddev->sync_thread) 5922 return -EBUSY; 5923 if (mddev->bitmap) 5924 /* Sorry, cannot grow a bitmap yet, just remove it, 5925 * grow, and re-add. 5926 */ 5927 return -EBUSY; 5928 rdev_for_each(rdev, mddev) { 5929 sector_t avail = rdev->sectors; 5930 5931 if (fit && (num_sectors == 0 || num_sectors > avail)) 5932 num_sectors = avail; 5933 if (avail < num_sectors) 5934 return -ENOSPC; 5935 } 5936 rv = mddev->pers->resize(mddev, num_sectors); 5937 if (!rv) 5938 revalidate_disk(mddev->gendisk); 5939 return rv; 5940 } 5941 5942 static int update_raid_disks(struct mddev *mddev, int raid_disks) 5943 { 5944 int rv; 5945 /* change the number of raid disks */ 5946 if (mddev->pers->check_reshape == NULL) 5947 return -EINVAL; 5948 if (raid_disks <= 0 || 5949 (mddev->max_disks && raid_disks >= mddev->max_disks)) 5950 return -EINVAL; 5951 if (mddev->sync_thread || mddev->reshape_position != MaxSector) 5952 return -EBUSY; 5953 mddev->delta_disks = raid_disks - mddev->raid_disks; 5954 5955 rv = mddev->pers->check_reshape(mddev); 5956 if (rv < 0) 5957 mddev->delta_disks = 0; 5958 return rv; 5959 } 5960 5961 5962 /* 5963 * update_array_info is used to change the configuration of an 5964 * on-line array. 5965 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 5966 * fields in the info are checked against the array. 5967 * Any differences that cannot be handled will cause an error. 5968 * Normally, only one change can be managed at a time. 5969 */ 5970 static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) 5971 { 5972 int rv = 0; 5973 int cnt = 0; 5974 int state = 0; 5975 5976 /* calculate expected state,ignoring low bits */ 5977 if (mddev->bitmap && mddev->bitmap_info.offset) 5978 state |= (1 << MD_SB_BITMAP_PRESENT); 5979 5980 if (mddev->major_version != info->major_version || 5981 mddev->minor_version != info->minor_version || 5982 /* mddev->patch_version != info->patch_version || */ 5983 mddev->ctime != info->ctime || 5984 mddev->level != info->level || 5985 /* mddev->layout != info->layout || */ 5986 !mddev->persistent != info->not_persistent|| 5987 mddev->chunk_sectors != info->chunk_size >> 9 || 5988 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 5989 ((state^info->state) & 0xfffffe00) 5990 ) 5991 return -EINVAL; 5992 /* Check there is only one change */ 5993 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 5994 cnt++; 5995 if (mddev->raid_disks != info->raid_disks) 5996 cnt++; 5997 if (mddev->layout != info->layout) 5998 cnt++; 5999 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) 6000 cnt++; 6001 if (cnt == 0) 6002 return 0; 6003 if (cnt > 1) 6004 return -EINVAL; 6005 6006 if (mddev->layout != info->layout) { 6007 /* Change layout 6008 * we don't need to do anything at the md level, the 6009 * personality will take care of it all. 6010 */ 6011 if (mddev->pers->check_reshape == NULL) 6012 return -EINVAL; 6013 else { 6014 mddev->new_layout = info->layout; 6015 rv = mddev->pers->check_reshape(mddev); 6016 if (rv) 6017 mddev->new_layout = mddev->layout; 6018 return rv; 6019 } 6020 } 6021 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 6022 rv = update_size(mddev, (sector_t)info->size * 2); 6023 6024 if (mddev->raid_disks != info->raid_disks) 6025 rv = update_raid_disks(mddev, info->raid_disks); 6026 6027 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 6028 if (mddev->pers->quiesce == NULL) 6029 return -EINVAL; 6030 if (mddev->recovery || mddev->sync_thread) 6031 return -EBUSY; 6032 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 6033 /* add the bitmap */ 6034 if (mddev->bitmap) 6035 return -EEXIST; 6036 if (mddev->bitmap_info.default_offset == 0) 6037 return -EINVAL; 6038 mddev->bitmap_info.offset = 6039 mddev->bitmap_info.default_offset; 6040 mddev->pers->quiesce(mddev, 1); 6041 rv = bitmap_create(mddev); 6042 if (!rv) 6043 rv = bitmap_load(mddev); 6044 if (rv) 6045 bitmap_destroy(mddev); 6046 mddev->pers->quiesce(mddev, 0); 6047 } else { 6048 /* remove the bitmap */ 6049 if (!mddev->bitmap) 6050 return -ENOENT; 6051 if (mddev->bitmap->file) 6052 return -EINVAL; 6053 mddev->pers->quiesce(mddev, 1); 6054 bitmap_destroy(mddev); 6055 mddev->pers->quiesce(mddev, 0); 6056 mddev->bitmap_info.offset = 0; 6057 } 6058 } 6059 md_update_sb(mddev, 1); 6060 return rv; 6061 } 6062 6063 static int set_disk_faulty(struct mddev *mddev, dev_t dev) 6064 { 6065 struct md_rdev *rdev; 6066 6067 if (mddev->pers == NULL) 6068 return -ENODEV; 6069 6070 rdev = find_rdev(mddev, dev); 6071 if (!rdev) 6072 return -ENODEV; 6073 6074 md_error(mddev, rdev); 6075 if (!test_bit(Faulty, &rdev->flags)) 6076 return -EBUSY; 6077 return 0; 6078 } 6079 6080 /* 6081 * We have a problem here : there is no easy way to give a CHS 6082 * virtual geometry. We currently pretend that we have a 2 heads 6083 * 4 sectors (with a BIG number of cylinders...). This drives 6084 * dosfs just mad... ;-) 6085 */ 6086 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) 6087 { 6088 struct mddev *mddev = bdev->bd_disk->private_data; 6089 6090 geo->heads = 2; 6091 geo->sectors = 4; 6092 geo->cylinders = mddev->array_sectors / 8; 6093 return 0; 6094 } 6095 6096 static int md_ioctl(struct block_device *bdev, fmode_t mode, 6097 unsigned int cmd, unsigned long arg) 6098 { 6099 int err = 0; 6100 void __user *argp = (void __user *)arg; 6101 struct mddev *mddev = NULL; 6102 int ro; 6103 6104 switch (cmd) { 6105 case RAID_VERSION: 6106 case GET_ARRAY_INFO: 6107 case GET_DISK_INFO: 6108 break; 6109 default: 6110 if (!capable(CAP_SYS_ADMIN)) 6111 return -EACCES; 6112 } 6113 6114 /* 6115 * Commands dealing with the RAID driver but not any 6116 * particular array: 6117 */ 6118 switch (cmd) 6119 { 6120 case RAID_VERSION: 6121 err = get_version(argp); 6122 goto done; 6123 6124 case PRINT_RAID_DEBUG: 6125 err = 0; 6126 md_print_devices(); 6127 goto done; 6128 6129 #ifndef MODULE 6130 case RAID_AUTORUN: 6131 err = 0; 6132 autostart_arrays(arg); 6133 goto done; 6134 #endif 6135 default:; 6136 } 6137 6138 /* 6139 * Commands creating/starting a new array: 6140 */ 6141 6142 mddev = bdev->bd_disk->private_data; 6143 6144 if (!mddev) { 6145 BUG(); 6146 goto abort; 6147 } 6148 6149 err = mddev_lock(mddev); 6150 if (err) { 6151 printk(KERN_INFO 6152 "md: ioctl lock interrupted, reason %d, cmd %d\n", 6153 err, cmd); 6154 goto abort; 6155 } 6156 6157 switch (cmd) 6158 { 6159 case SET_ARRAY_INFO: 6160 { 6161 mdu_array_info_t info; 6162 if (!arg) 6163 memset(&info, 0, sizeof(info)); 6164 else if (copy_from_user(&info, argp, sizeof(info))) { 6165 err = -EFAULT; 6166 goto abort_unlock; 6167 } 6168 if (mddev->pers) { 6169 err = update_array_info(mddev, &info); 6170 if (err) { 6171 printk(KERN_WARNING "md: couldn't update" 6172 " array info. %d\n", err); 6173 goto abort_unlock; 6174 } 6175 goto done_unlock; 6176 } 6177 if (!list_empty(&mddev->disks)) { 6178 printk(KERN_WARNING 6179 "md: array %s already has disks!\n", 6180 mdname(mddev)); 6181 err = -EBUSY; 6182 goto abort_unlock; 6183 } 6184 if (mddev->raid_disks) { 6185 printk(KERN_WARNING 6186 "md: array %s already initialised!\n", 6187 mdname(mddev)); 6188 err = -EBUSY; 6189 goto abort_unlock; 6190 } 6191 err = set_array_info(mddev, &info); 6192 if (err) { 6193 printk(KERN_WARNING "md: couldn't set" 6194 " array info. %d\n", err); 6195 goto abort_unlock; 6196 } 6197 } 6198 goto done_unlock; 6199 6200 default:; 6201 } 6202 6203 /* 6204 * Commands querying/configuring an existing array: 6205 */ 6206 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 6207 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ 6208 if ((!mddev->raid_disks && !mddev->external) 6209 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 6210 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE 6211 && cmd != GET_BITMAP_FILE) { 6212 err = -ENODEV; 6213 goto abort_unlock; 6214 } 6215 6216 /* 6217 * Commands even a read-only array can execute: 6218 */ 6219 switch (cmd) 6220 { 6221 case GET_ARRAY_INFO: 6222 err = get_array_info(mddev, argp); 6223 goto done_unlock; 6224 6225 case GET_BITMAP_FILE: 6226 err = get_bitmap_file(mddev, argp); 6227 goto done_unlock; 6228 6229 case GET_DISK_INFO: 6230 err = get_disk_info(mddev, argp); 6231 goto done_unlock; 6232 6233 case RESTART_ARRAY_RW: 6234 err = restart_array(mddev); 6235 goto done_unlock; 6236 6237 case STOP_ARRAY: 6238 err = do_md_stop(mddev, 0, 1); 6239 goto done_unlock; 6240 6241 case STOP_ARRAY_RO: 6242 err = md_set_readonly(mddev, 1); 6243 goto done_unlock; 6244 6245 case BLKROSET: 6246 if (get_user(ro, (int __user *)(arg))) { 6247 err = -EFAULT; 6248 goto done_unlock; 6249 } 6250 err = -EINVAL; 6251 6252 /* if the bdev is going readonly the value of mddev->ro 6253 * does not matter, no writes are coming 6254 */ 6255 if (ro) 6256 goto done_unlock; 6257 6258 /* are we are already prepared for writes? */ 6259 if (mddev->ro != 1) 6260 goto done_unlock; 6261 6262 /* transitioning to readauto need only happen for 6263 * arrays that call md_write_start 6264 */ 6265 if (mddev->pers) { 6266 err = restart_array(mddev); 6267 if (err == 0) { 6268 mddev->ro = 2; 6269 set_disk_ro(mddev->gendisk, 0); 6270 } 6271 } 6272 goto done_unlock; 6273 } 6274 6275 /* 6276 * The remaining ioctls are changing the state of the 6277 * superblock, so we do not allow them on read-only arrays. 6278 * However non-MD ioctls (e.g. get-size) will still come through 6279 * here and hit the 'default' below, so only disallow 6280 * 'md' ioctls, and switch to rw mode if started auto-readonly. 6281 */ 6282 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { 6283 if (mddev->ro == 2) { 6284 mddev->ro = 0; 6285 sysfs_notify_dirent_safe(mddev->sysfs_state); 6286 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6287 md_wakeup_thread(mddev->thread); 6288 } else { 6289 err = -EROFS; 6290 goto abort_unlock; 6291 } 6292 } 6293 6294 switch (cmd) 6295 { 6296 case ADD_NEW_DISK: 6297 { 6298 mdu_disk_info_t info; 6299 if (copy_from_user(&info, argp, sizeof(info))) 6300 err = -EFAULT; 6301 else 6302 err = add_new_disk(mddev, &info); 6303 goto done_unlock; 6304 } 6305 6306 case HOT_REMOVE_DISK: 6307 err = hot_remove_disk(mddev, new_decode_dev(arg)); 6308 goto done_unlock; 6309 6310 case HOT_ADD_DISK: 6311 err = hot_add_disk(mddev, new_decode_dev(arg)); 6312 goto done_unlock; 6313 6314 case SET_DISK_FAULTY: 6315 err = set_disk_faulty(mddev, new_decode_dev(arg)); 6316 goto done_unlock; 6317 6318 case RUN_ARRAY: 6319 err = do_md_run(mddev); 6320 goto done_unlock; 6321 6322 case SET_BITMAP_FILE: 6323 err = set_bitmap_file(mddev, (int)arg); 6324 goto done_unlock; 6325 6326 default: 6327 err = -EINVAL; 6328 goto abort_unlock; 6329 } 6330 6331 done_unlock: 6332 abort_unlock: 6333 if (mddev->hold_active == UNTIL_IOCTL && 6334 err != -EINVAL) 6335 mddev->hold_active = 0; 6336 mddev_unlock(mddev); 6337 6338 return err; 6339 done: 6340 if (err) 6341 MD_BUG(); 6342 abort: 6343 return err; 6344 } 6345 #ifdef CONFIG_COMPAT 6346 static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, 6347 unsigned int cmd, unsigned long arg) 6348 { 6349 switch (cmd) { 6350 case HOT_REMOVE_DISK: 6351 case HOT_ADD_DISK: 6352 case SET_DISK_FAULTY: 6353 case SET_BITMAP_FILE: 6354 /* These take in integer arg, do not convert */ 6355 break; 6356 default: 6357 arg = (unsigned long)compat_ptr(arg); 6358 break; 6359 } 6360 6361 return md_ioctl(bdev, mode, cmd, arg); 6362 } 6363 #endif /* CONFIG_COMPAT */ 6364 6365 static int md_open(struct block_device *bdev, fmode_t mode) 6366 { 6367 /* 6368 * Succeed if we can lock the mddev, which confirms that 6369 * it isn't being stopped right now. 6370 */ 6371 struct mddev *mddev = mddev_find(bdev->bd_dev); 6372 int err; 6373 6374 if (mddev->gendisk != bdev->bd_disk) { 6375 /* we are racing with mddev_put which is discarding this 6376 * bd_disk. 6377 */ 6378 mddev_put(mddev); 6379 /* Wait until bdev->bd_disk is definitely gone */ 6380 flush_workqueue(md_misc_wq); 6381 /* Then retry the open from the top */ 6382 return -ERESTARTSYS; 6383 } 6384 BUG_ON(mddev != bdev->bd_disk->private_data); 6385 6386 if ((err = mutex_lock_interruptible(&mddev->open_mutex))) 6387 goto out; 6388 6389 err = 0; 6390 atomic_inc(&mddev->openers); 6391 mutex_unlock(&mddev->open_mutex); 6392 6393 check_disk_change(bdev); 6394 out: 6395 return err; 6396 } 6397 6398 static int md_release(struct gendisk *disk, fmode_t mode) 6399 { 6400 struct mddev *mddev = disk->private_data; 6401 6402 BUG_ON(!mddev); 6403 atomic_dec(&mddev->openers); 6404 mddev_put(mddev); 6405 6406 return 0; 6407 } 6408 6409 static int md_media_changed(struct gendisk *disk) 6410 { 6411 struct mddev *mddev = disk->private_data; 6412 6413 return mddev->changed; 6414 } 6415 6416 static int md_revalidate(struct gendisk *disk) 6417 { 6418 struct mddev *mddev = disk->private_data; 6419 6420 mddev->changed = 0; 6421 return 0; 6422 } 6423 static const struct block_device_operations md_fops = 6424 { 6425 .owner = THIS_MODULE, 6426 .open = md_open, 6427 .release = md_release, 6428 .ioctl = md_ioctl, 6429 #ifdef CONFIG_COMPAT 6430 .compat_ioctl = md_compat_ioctl, 6431 #endif 6432 .getgeo = md_getgeo, 6433 .media_changed = md_media_changed, 6434 .revalidate_disk= md_revalidate, 6435 }; 6436 6437 static int md_thread(void * arg) 6438 { 6439 struct md_thread *thread = arg; 6440 6441 /* 6442 * md_thread is a 'system-thread', it's priority should be very 6443 * high. We avoid resource deadlocks individually in each 6444 * raid personality. (RAID5 does preallocation) We also use RR and 6445 * the very same RT priority as kswapd, thus we will never get 6446 * into a priority inversion deadlock. 6447 * 6448 * we definitely have to have equal or higher priority than 6449 * bdflush, otherwise bdflush will deadlock if there are too 6450 * many dirty RAID5 blocks. 6451 */ 6452 6453 allow_signal(SIGKILL); 6454 while (!kthread_should_stop()) { 6455 6456 /* We need to wait INTERRUPTIBLE so that 6457 * we don't add to the load-average. 6458 * That means we need to be sure no signals are 6459 * pending 6460 */ 6461 if (signal_pending(current)) 6462 flush_signals(current); 6463 6464 wait_event_interruptible_timeout 6465 (thread->wqueue, 6466 test_bit(THREAD_WAKEUP, &thread->flags) 6467 || kthread_should_stop(), 6468 thread->timeout); 6469 6470 clear_bit(THREAD_WAKEUP, &thread->flags); 6471 if (!kthread_should_stop()) 6472 thread->run(thread->mddev); 6473 } 6474 6475 return 0; 6476 } 6477 6478 void md_wakeup_thread(struct md_thread *thread) 6479 { 6480 if (thread) { 6481 pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); 6482 set_bit(THREAD_WAKEUP, &thread->flags); 6483 wake_up(&thread->wqueue); 6484 } 6485 } 6486 6487 struct md_thread *md_register_thread(void (*run) (struct mddev *), struct mddev *mddev, 6488 const char *name) 6489 { 6490 struct md_thread *thread; 6491 6492 thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); 6493 if (!thread) 6494 return NULL; 6495 6496 init_waitqueue_head(&thread->wqueue); 6497 6498 thread->run = run; 6499 thread->mddev = mddev; 6500 thread->timeout = MAX_SCHEDULE_TIMEOUT; 6501 thread->tsk = kthread_run(md_thread, thread, 6502 "%s_%s", 6503 mdname(thread->mddev), 6504 name ?: mddev->pers->name); 6505 if (IS_ERR(thread->tsk)) { 6506 kfree(thread); 6507 return NULL; 6508 } 6509 return thread; 6510 } 6511 6512 void md_unregister_thread(struct md_thread **threadp) 6513 { 6514 struct md_thread *thread = *threadp; 6515 if (!thread) 6516 return; 6517 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); 6518 /* Locking ensures that mddev_unlock does not wake_up a 6519 * non-existent thread 6520 */ 6521 spin_lock(&pers_lock); 6522 *threadp = NULL; 6523 spin_unlock(&pers_lock); 6524 6525 kthread_stop(thread->tsk); 6526 kfree(thread); 6527 } 6528 6529 void md_error(struct mddev *mddev, struct md_rdev *rdev) 6530 { 6531 if (!mddev) { 6532 MD_BUG(); 6533 return; 6534 } 6535 6536 if (!rdev || test_bit(Faulty, &rdev->flags)) 6537 return; 6538 6539 if (!mddev->pers || !mddev->pers->error_handler) 6540 return; 6541 mddev->pers->error_handler(mddev,rdev); 6542 if (mddev->degraded) 6543 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 6544 sysfs_notify_dirent_safe(rdev->sysfs_state); 6545 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6546 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6547 md_wakeup_thread(mddev->thread); 6548 if (mddev->event_work.func) 6549 queue_work(md_misc_wq, &mddev->event_work); 6550 md_new_event_inintr(mddev); 6551 } 6552 6553 /* seq_file implementation /proc/mdstat */ 6554 6555 static void status_unused(struct seq_file *seq) 6556 { 6557 int i = 0; 6558 struct md_rdev *rdev; 6559 6560 seq_printf(seq, "unused devices: "); 6561 6562 list_for_each_entry(rdev, &pending_raid_disks, same_set) { 6563 char b[BDEVNAME_SIZE]; 6564 i++; 6565 seq_printf(seq, "%s ", 6566 bdevname(rdev->bdev,b)); 6567 } 6568 if (!i) 6569 seq_printf(seq, "<none>"); 6570 6571 seq_printf(seq, "\n"); 6572 } 6573 6574 6575 static void status_resync(struct seq_file *seq, struct mddev * mddev) 6576 { 6577 sector_t max_sectors, resync, res; 6578 unsigned long dt, db; 6579 sector_t rt; 6580 int scale; 6581 unsigned int per_milli; 6582 6583 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); 6584 6585 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 6586 max_sectors = mddev->resync_max_sectors; 6587 else 6588 max_sectors = mddev->dev_sectors; 6589 6590 /* 6591 * Should not happen. 6592 */ 6593 if (!max_sectors) { 6594 MD_BUG(); 6595 return; 6596 } 6597 /* Pick 'scale' such that (resync>>scale)*1000 will fit 6598 * in a sector_t, and (max_sectors>>scale) will fit in a 6599 * u32, as those are the requirements for sector_div. 6600 * Thus 'scale' must be at least 10 6601 */ 6602 scale = 10; 6603 if (sizeof(sector_t) > sizeof(unsigned long)) { 6604 while ( max_sectors/2 > (1ULL<<(scale+32))) 6605 scale++; 6606 } 6607 res = (resync>>scale)*1000; 6608 sector_div(res, (u32)((max_sectors>>scale)+1)); 6609 6610 per_milli = res; 6611 { 6612 int i, x = per_milli/50, y = 20-x; 6613 seq_printf(seq, "["); 6614 for (i = 0; i < x; i++) 6615 seq_printf(seq, "="); 6616 seq_printf(seq, ">"); 6617 for (i = 0; i < y; i++) 6618 seq_printf(seq, "."); 6619 seq_printf(seq, "] "); 6620 } 6621 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", 6622 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? 6623 "reshape" : 6624 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? 6625 "check" : 6626 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 6627 "resync" : "recovery"))), 6628 per_milli/10, per_milli % 10, 6629 (unsigned long long) resync/2, 6630 (unsigned long long) max_sectors/2); 6631 6632 /* 6633 * dt: time from mark until now 6634 * db: blocks written from mark until now 6635 * rt: remaining time 6636 * 6637 * rt is a sector_t, so could be 32bit or 64bit. 6638 * So we divide before multiply in case it is 32bit and close 6639 * to the limit. 6640 * We scale the divisor (db) by 32 to avoid losing precision 6641 * near the end of resync when the number of remaining sectors 6642 * is close to 'db'. 6643 * We then divide rt by 32 after multiplying by db to compensate. 6644 * The '+1' avoids division by zero if db is very small. 6645 */ 6646 dt = ((jiffies - mddev->resync_mark) / HZ); 6647 if (!dt) dt++; 6648 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) 6649 - mddev->resync_mark_cnt; 6650 6651 rt = max_sectors - resync; /* number of remaining sectors */ 6652 sector_div(rt, db/32+1); 6653 rt *= dt; 6654 rt >>= 5; 6655 6656 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, 6657 ((unsigned long)rt % 60)/6); 6658 6659 seq_printf(seq, " speed=%ldK/sec", db/2/dt); 6660 } 6661 6662 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 6663 { 6664 struct list_head *tmp; 6665 loff_t l = *pos; 6666 struct mddev *mddev; 6667 6668 if (l >= 0x10000) 6669 return NULL; 6670 if (!l--) 6671 /* header */ 6672 return (void*)1; 6673 6674 spin_lock(&all_mddevs_lock); 6675 list_for_each(tmp,&all_mddevs) 6676 if (!l--) { 6677 mddev = list_entry(tmp, struct mddev, all_mddevs); 6678 mddev_get(mddev); 6679 spin_unlock(&all_mddevs_lock); 6680 return mddev; 6681 } 6682 spin_unlock(&all_mddevs_lock); 6683 if (!l--) 6684 return (void*)2;/* tail */ 6685 return NULL; 6686 } 6687 6688 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 6689 { 6690 struct list_head *tmp; 6691 struct mddev *next_mddev, *mddev = v; 6692 6693 ++*pos; 6694 if (v == (void*)2) 6695 return NULL; 6696 6697 spin_lock(&all_mddevs_lock); 6698 if (v == (void*)1) 6699 tmp = all_mddevs.next; 6700 else 6701 tmp = mddev->all_mddevs.next; 6702 if (tmp != &all_mddevs) 6703 next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); 6704 else { 6705 next_mddev = (void*)2; 6706 *pos = 0x10000; 6707 } 6708 spin_unlock(&all_mddevs_lock); 6709 6710 if (v != (void*)1) 6711 mddev_put(mddev); 6712 return next_mddev; 6713 6714 } 6715 6716 static void md_seq_stop(struct seq_file *seq, void *v) 6717 { 6718 struct mddev *mddev = v; 6719 6720 if (mddev && v != (void*)1 && v != (void*)2) 6721 mddev_put(mddev); 6722 } 6723 6724 static int md_seq_show(struct seq_file *seq, void *v) 6725 { 6726 struct mddev *mddev = v; 6727 sector_t sectors; 6728 struct md_rdev *rdev; 6729 6730 if (v == (void*)1) { 6731 struct md_personality *pers; 6732 seq_printf(seq, "Personalities : "); 6733 spin_lock(&pers_lock); 6734 list_for_each_entry(pers, &pers_list, list) 6735 seq_printf(seq, "[%s] ", pers->name); 6736 6737 spin_unlock(&pers_lock); 6738 seq_printf(seq, "\n"); 6739 seq->poll_event = atomic_read(&md_event_count); 6740 return 0; 6741 } 6742 if (v == (void*)2) { 6743 status_unused(seq); 6744 return 0; 6745 } 6746 6747 if (mddev_lock(mddev) < 0) 6748 return -EINTR; 6749 6750 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 6751 seq_printf(seq, "%s : %sactive", mdname(mddev), 6752 mddev->pers ? "" : "in"); 6753 if (mddev->pers) { 6754 if (mddev->ro==1) 6755 seq_printf(seq, " (read-only)"); 6756 if (mddev->ro==2) 6757 seq_printf(seq, " (auto-read-only)"); 6758 seq_printf(seq, " %s", mddev->pers->name); 6759 } 6760 6761 sectors = 0; 6762 rdev_for_each(rdev, mddev) { 6763 char b[BDEVNAME_SIZE]; 6764 seq_printf(seq, " %s[%d]", 6765 bdevname(rdev->bdev,b), rdev->desc_nr); 6766 if (test_bit(WriteMostly, &rdev->flags)) 6767 seq_printf(seq, "(W)"); 6768 if (test_bit(Faulty, &rdev->flags)) { 6769 seq_printf(seq, "(F)"); 6770 continue; 6771 } 6772 if (rdev->raid_disk < 0) 6773 seq_printf(seq, "(S)"); /* spare */ 6774 if (test_bit(Replacement, &rdev->flags)) 6775 seq_printf(seq, "(R)"); 6776 sectors += rdev->sectors; 6777 } 6778 6779 if (!list_empty(&mddev->disks)) { 6780 if (mddev->pers) 6781 seq_printf(seq, "\n %llu blocks", 6782 (unsigned long long) 6783 mddev->array_sectors / 2); 6784 else 6785 seq_printf(seq, "\n %llu blocks", 6786 (unsigned long long)sectors / 2); 6787 } 6788 if (mddev->persistent) { 6789 if (mddev->major_version != 0 || 6790 mddev->minor_version != 90) { 6791 seq_printf(seq," super %d.%d", 6792 mddev->major_version, 6793 mddev->minor_version); 6794 } 6795 } else if (mddev->external) 6796 seq_printf(seq, " super external:%s", 6797 mddev->metadata_type); 6798 else 6799 seq_printf(seq, " super non-persistent"); 6800 6801 if (mddev->pers) { 6802 mddev->pers->status(seq, mddev); 6803 seq_printf(seq, "\n "); 6804 if (mddev->pers->sync_request) { 6805 if (mddev->curr_resync > 2) { 6806 status_resync(seq, mddev); 6807 seq_printf(seq, "\n "); 6808 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) 6809 seq_printf(seq, "\tresync=DELAYED\n "); 6810 else if (mddev->recovery_cp < MaxSector) 6811 seq_printf(seq, "\tresync=PENDING\n "); 6812 } 6813 } else 6814 seq_printf(seq, "\n "); 6815 6816 bitmap_status(seq, mddev->bitmap); 6817 6818 seq_printf(seq, "\n"); 6819 } 6820 mddev_unlock(mddev); 6821 6822 return 0; 6823 } 6824 6825 static const struct seq_operations md_seq_ops = { 6826 .start = md_seq_start, 6827 .next = md_seq_next, 6828 .stop = md_seq_stop, 6829 .show = md_seq_show, 6830 }; 6831 6832 static int md_seq_open(struct inode *inode, struct file *file) 6833 { 6834 struct seq_file *seq; 6835 int error; 6836 6837 error = seq_open(file, &md_seq_ops); 6838 if (error) 6839 return error; 6840 6841 seq = file->private_data; 6842 seq->poll_event = atomic_read(&md_event_count); 6843 return error; 6844 } 6845 6846 static unsigned int mdstat_poll(struct file *filp, poll_table *wait) 6847 { 6848 struct seq_file *seq = filp->private_data; 6849 int mask; 6850 6851 poll_wait(filp, &md_event_waiters, wait); 6852 6853 /* always allow read */ 6854 mask = POLLIN | POLLRDNORM; 6855 6856 if (seq->poll_event != atomic_read(&md_event_count)) 6857 mask |= POLLERR | POLLPRI; 6858 return mask; 6859 } 6860 6861 static const struct file_operations md_seq_fops = { 6862 .owner = THIS_MODULE, 6863 .open = md_seq_open, 6864 .read = seq_read, 6865 .llseek = seq_lseek, 6866 .release = seq_release_private, 6867 .poll = mdstat_poll, 6868 }; 6869 6870 int register_md_personality(struct md_personality *p) 6871 { 6872 spin_lock(&pers_lock); 6873 list_add_tail(&p->list, &pers_list); 6874 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); 6875 spin_unlock(&pers_lock); 6876 return 0; 6877 } 6878 6879 int unregister_md_personality(struct md_personality *p) 6880 { 6881 printk(KERN_INFO "md: %s personality unregistered\n", p->name); 6882 spin_lock(&pers_lock); 6883 list_del_init(&p->list); 6884 spin_unlock(&pers_lock); 6885 return 0; 6886 } 6887 6888 static int is_mddev_idle(struct mddev *mddev, int init) 6889 { 6890 struct md_rdev * rdev; 6891 int idle; 6892 int curr_events; 6893 6894 idle = 1; 6895 rcu_read_lock(); 6896 rdev_for_each_rcu(rdev, mddev) { 6897 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 6898 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 6899 (int)part_stat_read(&disk->part0, sectors[1]) - 6900 atomic_read(&disk->sync_io); 6901 /* sync IO will cause sync_io to increase before the disk_stats 6902 * as sync_io is counted when a request starts, and 6903 * disk_stats is counted when it completes. 6904 * So resync activity will cause curr_events to be smaller than 6905 * when there was no such activity. 6906 * non-sync IO will cause disk_stat to increase without 6907 * increasing sync_io so curr_events will (eventually) 6908 * be larger than it was before. Once it becomes 6909 * substantially larger, the test below will cause 6910 * the array to appear non-idle, and resync will slow 6911 * down. 6912 * If there is a lot of outstanding resync activity when 6913 * we set last_event to curr_events, then all that activity 6914 * completing might cause the array to appear non-idle 6915 * and resync will be slowed down even though there might 6916 * not have been non-resync activity. This will only 6917 * happen once though. 'last_events' will soon reflect 6918 * the state where there is little or no outstanding 6919 * resync requests, and further resync activity will 6920 * always make curr_events less than last_events. 6921 * 6922 */ 6923 if (init || curr_events - rdev->last_events > 64) { 6924 rdev->last_events = curr_events; 6925 idle = 0; 6926 } 6927 } 6928 rcu_read_unlock(); 6929 return idle; 6930 } 6931 6932 void md_done_sync(struct mddev *mddev, int blocks, int ok) 6933 { 6934 /* another "blocks" (512byte) blocks have been synced */ 6935 atomic_sub(blocks, &mddev->recovery_active); 6936 wake_up(&mddev->recovery_wait); 6937 if (!ok) { 6938 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6939 md_wakeup_thread(mddev->thread); 6940 // stop recovery, signal do_sync .... 6941 } 6942 } 6943 6944 6945 /* md_write_start(mddev, bi) 6946 * If we need to update some array metadata (e.g. 'active' flag 6947 * in superblock) before writing, schedule a superblock update 6948 * and wait for it to complete. 6949 */ 6950 void md_write_start(struct mddev *mddev, struct bio *bi) 6951 { 6952 int did_change = 0; 6953 if (bio_data_dir(bi) != WRITE) 6954 return; 6955 6956 BUG_ON(mddev->ro == 1); 6957 if (mddev->ro == 2) { 6958 /* need to switch to read/write */ 6959 mddev->ro = 0; 6960 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6961 md_wakeup_thread(mddev->thread); 6962 md_wakeup_thread(mddev->sync_thread); 6963 did_change = 1; 6964 } 6965 atomic_inc(&mddev->writes_pending); 6966 if (mddev->safemode == 1) 6967 mddev->safemode = 0; 6968 if (mddev->in_sync) { 6969 spin_lock_irq(&mddev->write_lock); 6970 if (mddev->in_sync) { 6971 mddev->in_sync = 0; 6972 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 6973 set_bit(MD_CHANGE_PENDING, &mddev->flags); 6974 md_wakeup_thread(mddev->thread); 6975 did_change = 1; 6976 } 6977 spin_unlock_irq(&mddev->write_lock); 6978 } 6979 if (did_change) 6980 sysfs_notify_dirent_safe(mddev->sysfs_state); 6981 wait_event(mddev->sb_wait, 6982 !test_bit(MD_CHANGE_PENDING, &mddev->flags)); 6983 } 6984 6985 void md_write_end(struct mddev *mddev) 6986 { 6987 if (atomic_dec_and_test(&mddev->writes_pending)) { 6988 if (mddev->safemode == 2) 6989 md_wakeup_thread(mddev->thread); 6990 else if (mddev->safemode_delay) 6991 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 6992 } 6993 } 6994 6995 /* md_allow_write(mddev) 6996 * Calling this ensures that the array is marked 'active' so that writes 6997 * may proceed without blocking. It is important to call this before 6998 * attempting a GFP_KERNEL allocation while holding the mddev lock. 6999 * Must be called with mddev_lock held. 7000 * 7001 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock 7002 * is dropped, so return -EAGAIN after notifying userspace. 7003 */ 7004 int md_allow_write(struct mddev *mddev) 7005 { 7006 if (!mddev->pers) 7007 return 0; 7008 if (mddev->ro) 7009 return 0; 7010 if (!mddev->pers->sync_request) 7011 return 0; 7012 7013 spin_lock_irq(&mddev->write_lock); 7014 if (mddev->in_sync) { 7015 mddev->in_sync = 0; 7016 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7017 set_bit(MD_CHANGE_PENDING, &mddev->flags); 7018 if (mddev->safemode_delay && 7019 mddev->safemode == 0) 7020 mddev->safemode = 1; 7021 spin_unlock_irq(&mddev->write_lock); 7022 md_update_sb(mddev, 0); 7023 sysfs_notify_dirent_safe(mddev->sysfs_state); 7024 } else 7025 spin_unlock_irq(&mddev->write_lock); 7026 7027 if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) 7028 return -EAGAIN; 7029 else 7030 return 0; 7031 } 7032 EXPORT_SYMBOL_GPL(md_allow_write); 7033 7034 #define SYNC_MARKS 10 7035 #define SYNC_MARK_STEP (3*HZ) 7036 void md_do_sync(struct mddev *mddev) 7037 { 7038 struct mddev *mddev2; 7039 unsigned int currspeed = 0, 7040 window; 7041 sector_t max_sectors,j, io_sectors; 7042 unsigned long mark[SYNC_MARKS]; 7043 sector_t mark_cnt[SYNC_MARKS]; 7044 int last_mark,m; 7045 struct list_head *tmp; 7046 sector_t last_check; 7047 int skipped = 0; 7048 struct md_rdev *rdev; 7049 char *desc; 7050 7051 /* just incase thread restarts... */ 7052 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 7053 return; 7054 if (mddev->ro) /* never try to sync a read-only array */ 7055 return; 7056 7057 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7058 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 7059 desc = "data-check"; 7060 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7061 desc = "requested-resync"; 7062 else 7063 desc = "resync"; 7064 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7065 desc = "reshape"; 7066 else 7067 desc = "recovery"; 7068 7069 /* we overload curr_resync somewhat here. 7070 * 0 == not engaged in resync at all 7071 * 2 == checking that there is no conflict with another sync 7072 * 1 == like 2, but have yielded to allow conflicting resync to 7073 * commense 7074 * other == active in resync - this many blocks 7075 * 7076 * Before starting a resync we must have set curr_resync to 7077 * 2, and then checked that every "conflicting" array has curr_resync 7078 * less than ours. When we find one that is the same or higher 7079 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 7080 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 7081 * This will mean we have to start checking from the beginning again. 7082 * 7083 */ 7084 7085 do { 7086 mddev->curr_resync = 2; 7087 7088 try_again: 7089 if (kthread_should_stop()) 7090 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7091 7092 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7093 goto skip; 7094 for_each_mddev(mddev2, tmp) { 7095 if (mddev2 == mddev) 7096 continue; 7097 if (!mddev->parallel_resync 7098 && mddev2->curr_resync 7099 && match_mddev_units(mddev, mddev2)) { 7100 DEFINE_WAIT(wq); 7101 if (mddev < mddev2 && mddev->curr_resync == 2) { 7102 /* arbitrarily yield */ 7103 mddev->curr_resync = 1; 7104 wake_up(&resync_wait); 7105 } 7106 if (mddev > mddev2 && mddev->curr_resync == 1) 7107 /* no need to wait here, we can wait the next 7108 * time 'round when curr_resync == 2 7109 */ 7110 continue; 7111 /* We need to wait 'interruptible' so as not to 7112 * contribute to the load average, and not to 7113 * be caught by 'softlockup' 7114 */ 7115 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); 7116 if (!kthread_should_stop() && 7117 mddev2->curr_resync >= mddev->curr_resync) { 7118 printk(KERN_INFO "md: delaying %s of %s" 7119 " until %s has finished (they" 7120 " share one or more physical units)\n", 7121 desc, mdname(mddev), mdname(mddev2)); 7122 mddev_put(mddev2); 7123 if (signal_pending(current)) 7124 flush_signals(current); 7125 schedule(); 7126 finish_wait(&resync_wait, &wq); 7127 goto try_again; 7128 } 7129 finish_wait(&resync_wait, &wq); 7130 } 7131 } 7132 } while (mddev->curr_resync < 2); 7133 7134 j = 0; 7135 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7136 /* resync follows the size requested by the personality, 7137 * which defaults to physical size, but can be virtual size 7138 */ 7139 max_sectors = mddev->resync_max_sectors; 7140 mddev->resync_mismatches = 0; 7141 /* we don't use the checkpoint if there's a bitmap */ 7142 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7143 j = mddev->resync_min; 7144 else if (!mddev->bitmap) 7145 j = mddev->recovery_cp; 7146 7147 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 7148 max_sectors = mddev->dev_sectors; 7149 else { 7150 /* recovery follows the physical size of devices */ 7151 max_sectors = mddev->dev_sectors; 7152 j = MaxSector; 7153 rcu_read_lock(); 7154 rdev_for_each_rcu(rdev, mddev) 7155 if (rdev->raid_disk >= 0 && 7156 !test_bit(Faulty, &rdev->flags) && 7157 !test_bit(In_sync, &rdev->flags) && 7158 rdev->recovery_offset < j) 7159 j = rdev->recovery_offset; 7160 rcu_read_unlock(); 7161 } 7162 7163 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); 7164 printk(KERN_INFO "md: minimum _guaranteed_ speed:" 7165 " %d KB/sec/disk.\n", speed_min(mddev)); 7166 printk(KERN_INFO "md: using maximum available idle IO bandwidth " 7167 "(but not more than %d KB/sec) for %s.\n", 7168 speed_max(mddev), desc); 7169 7170 is_mddev_idle(mddev, 1); /* this initializes IO event counters */ 7171 7172 io_sectors = 0; 7173 for (m = 0; m < SYNC_MARKS; m++) { 7174 mark[m] = jiffies; 7175 mark_cnt[m] = io_sectors; 7176 } 7177 last_mark = 0; 7178 mddev->resync_mark = mark[last_mark]; 7179 mddev->resync_mark_cnt = mark_cnt[last_mark]; 7180 7181 /* 7182 * Tune reconstruction: 7183 */ 7184 window = 32*(PAGE_SIZE/512); 7185 printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", 7186 window/2, (unsigned long long)max_sectors/2); 7187 7188 atomic_set(&mddev->recovery_active, 0); 7189 last_check = 0; 7190 7191 if (j>2) { 7192 printk(KERN_INFO 7193 "md: resuming %s of %s from checkpoint.\n", 7194 desc, mdname(mddev)); 7195 mddev->curr_resync = j; 7196 } 7197 mddev->curr_resync_completed = j; 7198 7199 while (j < max_sectors) { 7200 sector_t sectors; 7201 7202 skipped = 0; 7203 7204 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 7205 ((mddev->curr_resync > mddev->curr_resync_completed && 7206 (mddev->curr_resync - mddev->curr_resync_completed) 7207 > (max_sectors >> 4)) || 7208 (j - mddev->curr_resync_completed)*2 7209 >= mddev->resync_max - mddev->curr_resync_completed 7210 )) { 7211 /* time to update curr_resync_completed */ 7212 wait_event(mddev->recovery_wait, 7213 atomic_read(&mddev->recovery_active) == 0); 7214 mddev->curr_resync_completed = j; 7215 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7216 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 7217 } 7218 7219 while (j >= mddev->resync_max && !kthread_should_stop()) { 7220 /* As this condition is controlled by user-space, 7221 * we can block indefinitely, so use '_interruptible' 7222 * to avoid triggering warnings. 7223 */ 7224 flush_signals(current); /* just in case */ 7225 wait_event_interruptible(mddev->recovery_wait, 7226 mddev->resync_max > j 7227 || kthread_should_stop()); 7228 } 7229 7230 if (kthread_should_stop()) 7231 goto interrupted; 7232 7233 sectors = mddev->pers->sync_request(mddev, j, &skipped, 7234 currspeed < speed_min(mddev)); 7235 if (sectors == 0) { 7236 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7237 goto out; 7238 } 7239 7240 if (!skipped) { /* actual IO requested */ 7241 io_sectors += sectors; 7242 atomic_add(sectors, &mddev->recovery_active); 7243 } 7244 7245 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7246 break; 7247 7248 j += sectors; 7249 if (j>1) mddev->curr_resync = j; 7250 mddev->curr_mark_cnt = io_sectors; 7251 if (last_check == 0) 7252 /* this is the earliest that rebuild will be 7253 * visible in /proc/mdstat 7254 */ 7255 md_new_event(mddev); 7256 7257 if (last_check + window > io_sectors || j == max_sectors) 7258 continue; 7259 7260 last_check = io_sectors; 7261 repeat: 7262 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 7263 /* step marks */ 7264 int next = (last_mark+1) % SYNC_MARKS; 7265 7266 mddev->resync_mark = mark[next]; 7267 mddev->resync_mark_cnt = mark_cnt[next]; 7268 mark[next] = jiffies; 7269 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 7270 last_mark = next; 7271 } 7272 7273 7274 if (kthread_should_stop()) 7275 goto interrupted; 7276 7277 7278 /* 7279 * this loop exits only if either when we are slower than 7280 * the 'hard' speed limit, or the system was IO-idle for 7281 * a jiffy. 7282 * the system might be non-idle CPU-wise, but we only care 7283 * about not overloading the IO subsystem. (things like an 7284 * e2fsck being done on the RAID array should execute fast) 7285 */ 7286 cond_resched(); 7287 7288 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 7289 /((jiffies-mddev->resync_mark)/HZ +1) +1; 7290 7291 if (currspeed > speed_min(mddev)) { 7292 if ((currspeed > speed_max(mddev)) || 7293 !is_mddev_idle(mddev, 0)) { 7294 msleep(500); 7295 goto repeat; 7296 } 7297 } 7298 } 7299 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); 7300 /* 7301 * this also signals 'finished resyncing' to md_stop 7302 */ 7303 out: 7304 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 7305 7306 /* tell personality that we are finished */ 7307 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); 7308 7309 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && 7310 mddev->curr_resync > 2) { 7311 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 7312 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 7313 if (mddev->curr_resync >= mddev->recovery_cp) { 7314 printk(KERN_INFO 7315 "md: checkpointing %s of %s.\n", 7316 desc, mdname(mddev)); 7317 mddev->recovery_cp = 7318 mddev->curr_resync_completed; 7319 } 7320 } else 7321 mddev->recovery_cp = MaxSector; 7322 } else { 7323 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 7324 mddev->curr_resync = MaxSector; 7325 rcu_read_lock(); 7326 rdev_for_each_rcu(rdev, mddev) 7327 if (rdev->raid_disk >= 0 && 7328 mddev->delta_disks >= 0 && 7329 !test_bit(Faulty, &rdev->flags) && 7330 !test_bit(In_sync, &rdev->flags) && 7331 rdev->recovery_offset < mddev->curr_resync) 7332 rdev->recovery_offset = mddev->curr_resync; 7333 rcu_read_unlock(); 7334 } 7335 } 7336 skip: 7337 set_bit(MD_CHANGE_DEVS, &mddev->flags); 7338 7339 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 7340 /* We completed so min/max setting can be forgotten if used. */ 7341 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7342 mddev->resync_min = 0; 7343 mddev->resync_max = MaxSector; 7344 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 7345 mddev->resync_min = mddev->curr_resync_completed; 7346 mddev->curr_resync = 0; 7347 wake_up(&resync_wait); 7348 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 7349 md_wakeup_thread(mddev->thread); 7350 return; 7351 7352 interrupted: 7353 /* 7354 * got a signal, exit. 7355 */ 7356 printk(KERN_INFO 7357 "md: md_do_sync() got signal ... exiting\n"); 7358 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 7359 goto out; 7360 7361 } 7362 EXPORT_SYMBOL_GPL(md_do_sync); 7363 7364 static int remove_and_add_spares(struct mddev *mddev) 7365 { 7366 struct md_rdev *rdev; 7367 int spares = 0; 7368 int removed = 0; 7369 7370 mddev->curr_resync_completed = 0; 7371 7372 rdev_for_each(rdev, mddev) 7373 if (rdev->raid_disk >= 0 && 7374 !test_bit(Blocked, &rdev->flags) && 7375 (test_bit(Faulty, &rdev->flags) || 7376 ! test_bit(In_sync, &rdev->flags)) && 7377 atomic_read(&rdev->nr_pending)==0) { 7378 if (mddev->pers->hot_remove_disk( 7379 mddev, rdev) == 0) { 7380 sysfs_unlink_rdev(mddev, rdev); 7381 rdev->raid_disk = -1; 7382 removed++; 7383 } 7384 } 7385 if (removed) 7386 sysfs_notify(&mddev->kobj, NULL, 7387 "degraded"); 7388 7389 7390 rdev_for_each(rdev, mddev) { 7391 if (rdev->raid_disk >= 0 && 7392 !test_bit(In_sync, &rdev->flags) && 7393 !test_bit(Faulty, &rdev->flags)) 7394 spares++; 7395 if (rdev->raid_disk < 0 7396 && !test_bit(Faulty, &rdev->flags)) { 7397 rdev->recovery_offset = 0; 7398 if (mddev->pers-> 7399 hot_add_disk(mddev, rdev) == 0) { 7400 if (sysfs_link_rdev(mddev, rdev)) 7401 /* failure here is OK */; 7402 spares++; 7403 md_new_event(mddev); 7404 set_bit(MD_CHANGE_DEVS, &mddev->flags); 7405 } 7406 } 7407 } 7408 return spares; 7409 } 7410 7411 static void reap_sync_thread(struct mddev *mddev) 7412 { 7413 struct md_rdev *rdev; 7414 7415 /* resync has finished, collect result */ 7416 md_unregister_thread(&mddev->sync_thread); 7417 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 7418 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 7419 /* success...*/ 7420 /* activate any spares */ 7421 if (mddev->pers->spare_active(mddev)) 7422 sysfs_notify(&mddev->kobj, NULL, 7423 "degraded"); 7424 } 7425 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 7426 mddev->pers->finish_reshape) 7427 mddev->pers->finish_reshape(mddev); 7428 7429 /* If array is no-longer degraded, then any saved_raid_disk 7430 * information must be scrapped. Also if any device is now 7431 * In_sync we must scrape the saved_raid_disk for that device 7432 * do the superblock for an incrementally recovered device 7433 * written out. 7434 */ 7435 rdev_for_each(rdev, mddev) 7436 if (!mddev->degraded || 7437 test_bit(In_sync, &rdev->flags)) 7438 rdev->saved_raid_disk = -1; 7439 7440 md_update_sb(mddev, 1); 7441 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 7442 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 7443 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 7444 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 7445 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 7446 /* flag recovery needed just to double check */ 7447 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7448 sysfs_notify_dirent_safe(mddev->sysfs_action); 7449 md_new_event(mddev); 7450 if (mddev->event_work.func) 7451 queue_work(md_misc_wq, &mddev->event_work); 7452 } 7453 7454 /* 7455 * This routine is regularly called by all per-raid-array threads to 7456 * deal with generic issues like resync and super-block update. 7457 * Raid personalities that don't have a thread (linear/raid0) do not 7458 * need this as they never do any recovery or update the superblock. 7459 * 7460 * It does not do any resync itself, but rather "forks" off other threads 7461 * to do that as needed. 7462 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 7463 * "->recovery" and create a thread at ->sync_thread. 7464 * When the thread finishes it sets MD_RECOVERY_DONE 7465 * and wakeups up this thread which will reap the thread and finish up. 7466 * This thread also removes any faulty devices (with nr_pending == 0). 7467 * 7468 * The overall approach is: 7469 * 1/ if the superblock needs updating, update it. 7470 * 2/ If a recovery thread is running, don't do anything else. 7471 * 3/ If recovery has finished, clean up, possibly marking spares active. 7472 * 4/ If there are any faulty devices, remove them. 7473 * 5/ If array is degraded, try to add spares devices 7474 * 6/ If array has spares or is not in-sync, start a resync thread. 7475 */ 7476 void md_check_recovery(struct mddev *mddev) 7477 { 7478 if (mddev->suspended) 7479 return; 7480 7481 if (mddev->bitmap) 7482 bitmap_daemon_work(mddev); 7483 7484 if (signal_pending(current)) { 7485 if (mddev->pers->sync_request && !mddev->external) { 7486 printk(KERN_INFO "md: %s in immediate safe mode\n", 7487 mdname(mddev)); 7488 mddev->safemode = 2; 7489 } 7490 flush_signals(current); 7491 } 7492 7493 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 7494 return; 7495 if ( ! ( 7496 (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || 7497 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 7498 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 7499 (mddev->external == 0 && mddev->safemode == 1) || 7500 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 7501 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 7502 )) 7503 return; 7504 7505 if (mddev_trylock(mddev)) { 7506 int spares = 0; 7507 7508 if (mddev->ro) { 7509 /* Only thing we do on a ro array is remove 7510 * failed devices. 7511 */ 7512 struct md_rdev *rdev; 7513 rdev_for_each(rdev, mddev) 7514 if (rdev->raid_disk >= 0 && 7515 !test_bit(Blocked, &rdev->flags) && 7516 test_bit(Faulty, &rdev->flags) && 7517 atomic_read(&rdev->nr_pending)==0) { 7518 if (mddev->pers->hot_remove_disk( 7519 mddev, rdev) == 0) { 7520 sysfs_unlink_rdev(mddev, rdev); 7521 rdev->raid_disk = -1; 7522 } 7523 } 7524 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7525 goto unlock; 7526 } 7527 7528 if (!mddev->external) { 7529 int did_change = 0; 7530 spin_lock_irq(&mddev->write_lock); 7531 if (mddev->safemode && 7532 !atomic_read(&mddev->writes_pending) && 7533 !mddev->in_sync && 7534 mddev->recovery_cp == MaxSector) { 7535 mddev->in_sync = 1; 7536 did_change = 1; 7537 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 7538 } 7539 if (mddev->safemode == 1) 7540 mddev->safemode = 0; 7541 spin_unlock_irq(&mddev->write_lock); 7542 if (did_change) 7543 sysfs_notify_dirent_safe(mddev->sysfs_state); 7544 } 7545 7546 if (mddev->flags) 7547 md_update_sb(mddev, 0); 7548 7549 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 7550 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 7551 /* resync/recovery still happening */ 7552 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 7553 goto unlock; 7554 } 7555 if (mddev->sync_thread) { 7556 reap_sync_thread(mddev); 7557 goto unlock; 7558 } 7559 /* Set RUNNING before clearing NEEDED to avoid 7560 * any transients in the value of "sync_action". 7561 */ 7562 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 7563 /* Clear some bits that don't mean anything, but 7564 * might be left set 7565 */ 7566 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 7567 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 7568 7569 if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 7570 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 7571 goto unlock; 7572 /* no recovery is running. 7573 * remove any failed drives, then 7574 * add spares if possible. 7575 * Spare are also removed and re-added, to allow 7576 * the personality to fail the re-add. 7577 */ 7578 7579 if (mddev->reshape_position != MaxSector) { 7580 if (mddev->pers->check_reshape == NULL || 7581 mddev->pers->check_reshape(mddev) != 0) 7582 /* Cannot proceed */ 7583 goto unlock; 7584 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 7585 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7586 } else if ((spares = remove_and_add_spares(mddev))) { 7587 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 7588 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 7589 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 7590 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7591 } else if (mddev->recovery_cp < MaxSector) { 7592 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 7593 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 7594 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 7595 /* nothing to be done ... */ 7596 goto unlock; 7597 7598 if (mddev->pers->sync_request) { 7599 if (spares && mddev->bitmap && ! mddev->bitmap->file) { 7600 /* We are adding a device or devices to an array 7601 * which has the bitmap stored on all devices. 7602 * So make sure all bitmap pages get written 7603 */ 7604 bitmap_write_all(mddev->bitmap); 7605 } 7606 mddev->sync_thread = md_register_thread(md_do_sync, 7607 mddev, 7608 "resync"); 7609 if (!mddev->sync_thread) { 7610 printk(KERN_ERR "%s: could not start resync" 7611 " thread...\n", 7612 mdname(mddev)); 7613 /* leave the spares where they are, it shouldn't hurt */ 7614 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 7615 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 7616 clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 7617 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 7618 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 7619 } else 7620 md_wakeup_thread(mddev->sync_thread); 7621 sysfs_notify_dirent_safe(mddev->sysfs_action); 7622 md_new_event(mddev); 7623 } 7624 unlock: 7625 if (!mddev->sync_thread) { 7626 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 7627 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 7628 &mddev->recovery)) 7629 if (mddev->sysfs_action) 7630 sysfs_notify_dirent_safe(mddev->sysfs_action); 7631 } 7632 mddev_unlock(mddev); 7633 } 7634 } 7635 7636 void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) 7637 { 7638 sysfs_notify_dirent_safe(rdev->sysfs_state); 7639 wait_event_timeout(rdev->blocked_wait, 7640 !test_bit(Blocked, &rdev->flags) && 7641 !test_bit(BlockedBadBlocks, &rdev->flags), 7642 msecs_to_jiffies(5000)); 7643 rdev_dec_pending(rdev, mddev); 7644 } 7645 EXPORT_SYMBOL(md_wait_for_blocked_rdev); 7646 7647 7648 /* Bad block management. 7649 * We can record which blocks on each device are 'bad' and so just 7650 * fail those blocks, or that stripe, rather than the whole device. 7651 * Entries in the bad-block table are 64bits wide. This comprises: 7652 * Length of bad-range, in sectors: 0-511 for lengths 1-512 7653 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) 7654 * A 'shift' can be set so that larger blocks are tracked and 7655 * consequently larger devices can be covered. 7656 * 'Acknowledged' flag - 1 bit. - the most significant bit. 7657 * 7658 * Locking of the bad-block table uses a seqlock so md_is_badblock 7659 * might need to retry if it is very unlucky. 7660 * We will sometimes want to check for bad blocks in a bi_end_io function, 7661 * so we use the write_seqlock_irq variant. 7662 * 7663 * When looking for a bad block we specify a range and want to 7664 * know if any block in the range is bad. So we binary-search 7665 * to the last range that starts at-or-before the given endpoint, 7666 * (or "before the sector after the target range") 7667 * then see if it ends after the given start. 7668 * We return 7669 * 0 if there are no known bad blocks in the range 7670 * 1 if there are known bad block which are all acknowledged 7671 * -1 if there are bad blocks which have not yet been acknowledged in metadata. 7672 * plus the start/length of the first bad section we overlap. 7673 */ 7674 int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, 7675 sector_t *first_bad, int *bad_sectors) 7676 { 7677 int hi; 7678 int lo = 0; 7679 u64 *p = bb->page; 7680 int rv = 0; 7681 sector_t target = s + sectors; 7682 unsigned seq; 7683 7684 if (bb->shift > 0) { 7685 /* round the start down, and the end up */ 7686 s >>= bb->shift; 7687 target += (1<<bb->shift) - 1; 7688 target >>= bb->shift; 7689 sectors = target - s; 7690 } 7691 /* 'target' is now the first block after the bad range */ 7692 7693 retry: 7694 seq = read_seqbegin(&bb->lock); 7695 7696 hi = bb->count; 7697 7698 /* Binary search between lo and hi for 'target' 7699 * i.e. for the last range that starts before 'target' 7700 */ 7701 /* INVARIANT: ranges before 'lo' and at-or-after 'hi' 7702 * are known not to be the last range before target. 7703 * VARIANT: hi-lo is the number of possible 7704 * ranges, and decreases until it reaches 1 7705 */ 7706 while (hi - lo > 1) { 7707 int mid = (lo + hi) / 2; 7708 sector_t a = BB_OFFSET(p[mid]); 7709 if (a < target) 7710 /* This could still be the one, earlier ranges 7711 * could not. */ 7712 lo = mid; 7713 else 7714 /* This and later ranges are definitely out. */ 7715 hi = mid; 7716 } 7717 /* 'lo' might be the last that started before target, but 'hi' isn't */ 7718 if (hi > lo) { 7719 /* need to check all range that end after 's' to see if 7720 * any are unacknowledged. 7721 */ 7722 while (lo >= 0 && 7723 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { 7724 if (BB_OFFSET(p[lo]) < target) { 7725 /* starts before the end, and finishes after 7726 * the start, so they must overlap 7727 */ 7728 if (rv != -1 && BB_ACK(p[lo])) 7729 rv = 1; 7730 else 7731 rv = -1; 7732 *first_bad = BB_OFFSET(p[lo]); 7733 *bad_sectors = BB_LEN(p[lo]); 7734 } 7735 lo--; 7736 } 7737 } 7738 7739 if (read_seqretry(&bb->lock, seq)) 7740 goto retry; 7741 7742 return rv; 7743 } 7744 EXPORT_SYMBOL_GPL(md_is_badblock); 7745 7746 /* 7747 * Add a range of bad blocks to the table. 7748 * This might extend the table, or might contract it 7749 * if two adjacent ranges can be merged. 7750 * We binary-search to find the 'insertion' point, then 7751 * decide how best to handle it. 7752 */ 7753 static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, 7754 int acknowledged) 7755 { 7756 u64 *p; 7757 int lo, hi; 7758 int rv = 1; 7759 7760 if (bb->shift < 0) 7761 /* badblocks are disabled */ 7762 return 0; 7763 7764 if (bb->shift) { 7765 /* round the start down, and the end up */ 7766 sector_t next = s + sectors; 7767 s >>= bb->shift; 7768 next += (1<<bb->shift) - 1; 7769 next >>= bb->shift; 7770 sectors = next - s; 7771 } 7772 7773 write_seqlock_irq(&bb->lock); 7774 7775 p = bb->page; 7776 lo = 0; 7777 hi = bb->count; 7778 /* Find the last range that starts at-or-before 's' */ 7779 while (hi - lo > 1) { 7780 int mid = (lo + hi) / 2; 7781 sector_t a = BB_OFFSET(p[mid]); 7782 if (a <= s) 7783 lo = mid; 7784 else 7785 hi = mid; 7786 } 7787 if (hi > lo && BB_OFFSET(p[lo]) > s) 7788 hi = lo; 7789 7790 if (hi > lo) { 7791 /* we found a range that might merge with the start 7792 * of our new range 7793 */ 7794 sector_t a = BB_OFFSET(p[lo]); 7795 sector_t e = a + BB_LEN(p[lo]); 7796 int ack = BB_ACK(p[lo]); 7797 if (e >= s) { 7798 /* Yes, we can merge with a previous range */ 7799 if (s == a && s + sectors >= e) 7800 /* new range covers old */ 7801 ack = acknowledged; 7802 else 7803 ack = ack && acknowledged; 7804 7805 if (e < s + sectors) 7806 e = s + sectors; 7807 if (e - a <= BB_MAX_LEN) { 7808 p[lo] = BB_MAKE(a, e-a, ack); 7809 s = e; 7810 } else { 7811 /* does not all fit in one range, 7812 * make p[lo] maximal 7813 */ 7814 if (BB_LEN(p[lo]) != BB_MAX_LEN) 7815 p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); 7816 s = a + BB_MAX_LEN; 7817 } 7818 sectors = e - s; 7819 } 7820 } 7821 if (sectors && hi < bb->count) { 7822 /* 'hi' points to the first range that starts after 's'. 7823 * Maybe we can merge with the start of that range */ 7824 sector_t a = BB_OFFSET(p[hi]); 7825 sector_t e = a + BB_LEN(p[hi]); 7826 int ack = BB_ACK(p[hi]); 7827 if (a <= s + sectors) { 7828 /* merging is possible */ 7829 if (e <= s + sectors) { 7830 /* full overlap */ 7831 e = s + sectors; 7832 ack = acknowledged; 7833 } else 7834 ack = ack && acknowledged; 7835 7836 a = s; 7837 if (e - a <= BB_MAX_LEN) { 7838 p[hi] = BB_MAKE(a, e-a, ack); 7839 s = e; 7840 } else { 7841 p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); 7842 s = a + BB_MAX_LEN; 7843 } 7844 sectors = e - s; 7845 lo = hi; 7846 hi++; 7847 } 7848 } 7849 if (sectors == 0 && hi < bb->count) { 7850 /* we might be able to combine lo and hi */ 7851 /* Note: 's' is at the end of 'lo' */ 7852 sector_t a = BB_OFFSET(p[hi]); 7853 int lolen = BB_LEN(p[lo]); 7854 int hilen = BB_LEN(p[hi]); 7855 int newlen = lolen + hilen - (s - a); 7856 if (s >= a && newlen < BB_MAX_LEN) { 7857 /* yes, we can combine them */ 7858 int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); 7859 p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); 7860 memmove(p + hi, p + hi + 1, 7861 (bb->count - hi - 1) * 8); 7862 bb->count--; 7863 } 7864 } 7865 while (sectors) { 7866 /* didn't merge (it all). 7867 * Need to add a range just before 'hi' */ 7868 if (bb->count >= MD_MAX_BADBLOCKS) { 7869 /* No room for more */ 7870 rv = 0; 7871 break; 7872 } else { 7873 int this_sectors = sectors; 7874 memmove(p + hi + 1, p + hi, 7875 (bb->count - hi) * 8); 7876 bb->count++; 7877 7878 if (this_sectors > BB_MAX_LEN) 7879 this_sectors = BB_MAX_LEN; 7880 p[hi] = BB_MAKE(s, this_sectors, acknowledged); 7881 sectors -= this_sectors; 7882 s += this_sectors; 7883 } 7884 } 7885 7886 bb->changed = 1; 7887 if (!acknowledged) 7888 bb->unacked_exist = 1; 7889 write_sequnlock_irq(&bb->lock); 7890 7891 return rv; 7892 } 7893 7894 int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 7895 int acknowledged) 7896 { 7897 int rv = md_set_badblocks(&rdev->badblocks, 7898 s + rdev->data_offset, sectors, acknowledged); 7899 if (rv) { 7900 /* Make sure they get written out promptly */ 7901 sysfs_notify_dirent_safe(rdev->sysfs_state); 7902 set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); 7903 md_wakeup_thread(rdev->mddev->thread); 7904 } 7905 return rv; 7906 } 7907 EXPORT_SYMBOL_GPL(rdev_set_badblocks); 7908 7909 /* 7910 * Remove a range of bad blocks from the table. 7911 * This may involve extending the table if we spilt a region, 7912 * but it must not fail. So if the table becomes full, we just 7913 * drop the remove request. 7914 */ 7915 static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) 7916 { 7917 u64 *p; 7918 int lo, hi; 7919 sector_t target = s + sectors; 7920 int rv = 0; 7921 7922 if (bb->shift > 0) { 7923 /* When clearing we round the start up and the end down. 7924 * This should not matter as the shift should align with 7925 * the block size and no rounding should ever be needed. 7926 * However it is better the think a block is bad when it 7927 * isn't than to think a block is not bad when it is. 7928 */ 7929 s += (1<<bb->shift) - 1; 7930 s >>= bb->shift; 7931 target >>= bb->shift; 7932 sectors = target - s; 7933 } 7934 7935 write_seqlock_irq(&bb->lock); 7936 7937 p = bb->page; 7938 lo = 0; 7939 hi = bb->count; 7940 /* Find the last range that starts before 'target' */ 7941 while (hi - lo > 1) { 7942 int mid = (lo + hi) / 2; 7943 sector_t a = BB_OFFSET(p[mid]); 7944 if (a < target) 7945 lo = mid; 7946 else 7947 hi = mid; 7948 } 7949 if (hi > lo) { 7950 /* p[lo] is the last range that could overlap the 7951 * current range. Earlier ranges could also overlap, 7952 * but only this one can overlap the end of the range. 7953 */ 7954 if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { 7955 /* Partial overlap, leave the tail of this range */ 7956 int ack = BB_ACK(p[lo]); 7957 sector_t a = BB_OFFSET(p[lo]); 7958 sector_t end = a + BB_LEN(p[lo]); 7959 7960 if (a < s) { 7961 /* we need to split this range */ 7962 if (bb->count >= MD_MAX_BADBLOCKS) { 7963 rv = 0; 7964 goto out; 7965 } 7966 memmove(p+lo+1, p+lo, (bb->count - lo) * 8); 7967 bb->count++; 7968 p[lo] = BB_MAKE(a, s-a, ack); 7969 lo++; 7970 } 7971 p[lo] = BB_MAKE(target, end - target, ack); 7972 /* there is no longer an overlap */ 7973 hi = lo; 7974 lo--; 7975 } 7976 while (lo >= 0 && 7977 BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { 7978 /* This range does overlap */ 7979 if (BB_OFFSET(p[lo]) < s) { 7980 /* Keep the early parts of this range. */ 7981 int ack = BB_ACK(p[lo]); 7982 sector_t start = BB_OFFSET(p[lo]); 7983 p[lo] = BB_MAKE(start, s - start, ack); 7984 /* now low doesn't overlap, so.. */ 7985 break; 7986 } 7987 lo--; 7988 } 7989 /* 'lo' is strictly before, 'hi' is strictly after, 7990 * anything between needs to be discarded 7991 */ 7992 if (hi - lo > 1) { 7993 memmove(p+lo+1, p+hi, (bb->count - hi) * 8); 7994 bb->count -= (hi - lo - 1); 7995 } 7996 } 7997 7998 bb->changed = 1; 7999 out: 8000 write_sequnlock_irq(&bb->lock); 8001 return rv; 8002 } 8003 8004 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors) 8005 { 8006 return md_clear_badblocks(&rdev->badblocks, 8007 s + rdev->data_offset, 8008 sectors); 8009 } 8010 EXPORT_SYMBOL_GPL(rdev_clear_badblocks); 8011 8012 /* 8013 * Acknowledge all bad blocks in a list. 8014 * This only succeeds if ->changed is clear. It is used by 8015 * in-kernel metadata updates 8016 */ 8017 void md_ack_all_badblocks(struct badblocks *bb) 8018 { 8019 if (bb->page == NULL || bb->changed) 8020 /* no point even trying */ 8021 return; 8022 write_seqlock_irq(&bb->lock); 8023 8024 if (bb->changed == 0 && bb->unacked_exist) { 8025 u64 *p = bb->page; 8026 int i; 8027 for (i = 0; i < bb->count ; i++) { 8028 if (!BB_ACK(p[i])) { 8029 sector_t start = BB_OFFSET(p[i]); 8030 int len = BB_LEN(p[i]); 8031 p[i] = BB_MAKE(start, len, 1); 8032 } 8033 } 8034 bb->unacked_exist = 0; 8035 } 8036 write_sequnlock_irq(&bb->lock); 8037 } 8038 EXPORT_SYMBOL_GPL(md_ack_all_badblocks); 8039 8040 /* sysfs access to bad-blocks list. 8041 * We present two files. 8042 * 'bad-blocks' lists sector numbers and lengths of ranges that 8043 * are recorded as bad. The list is truncated to fit within 8044 * the one-page limit of sysfs. 8045 * Writing "sector length" to this file adds an acknowledged 8046 * bad block list. 8047 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet 8048 * been acknowledged. Writing to this file adds bad blocks 8049 * without acknowledging them. This is largely for testing. 8050 */ 8051 8052 static ssize_t 8053 badblocks_show(struct badblocks *bb, char *page, int unack) 8054 { 8055 size_t len; 8056 int i; 8057 u64 *p = bb->page; 8058 unsigned seq; 8059 8060 if (bb->shift < 0) 8061 return 0; 8062 8063 retry: 8064 seq = read_seqbegin(&bb->lock); 8065 8066 len = 0; 8067 i = 0; 8068 8069 while (len < PAGE_SIZE && i < bb->count) { 8070 sector_t s = BB_OFFSET(p[i]); 8071 unsigned int length = BB_LEN(p[i]); 8072 int ack = BB_ACK(p[i]); 8073 i++; 8074 8075 if (unack && ack) 8076 continue; 8077 8078 len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", 8079 (unsigned long long)s << bb->shift, 8080 length << bb->shift); 8081 } 8082 if (unack && len == 0) 8083 bb->unacked_exist = 0; 8084 8085 if (read_seqretry(&bb->lock, seq)) 8086 goto retry; 8087 8088 return len; 8089 } 8090 8091 #define DO_DEBUG 1 8092 8093 static ssize_t 8094 badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) 8095 { 8096 unsigned long long sector; 8097 int length; 8098 char newline; 8099 #ifdef DO_DEBUG 8100 /* Allow clearing via sysfs *only* for testing/debugging. 8101 * Normally only a successful write may clear a badblock 8102 */ 8103 int clear = 0; 8104 if (page[0] == '-') { 8105 clear = 1; 8106 page++; 8107 } 8108 #endif /* DO_DEBUG */ 8109 8110 switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { 8111 case 3: 8112 if (newline != '\n') 8113 return -EINVAL; 8114 case 2: 8115 if (length <= 0) 8116 return -EINVAL; 8117 break; 8118 default: 8119 return -EINVAL; 8120 } 8121 8122 #ifdef DO_DEBUG 8123 if (clear) { 8124 md_clear_badblocks(bb, sector, length); 8125 return len; 8126 } 8127 #endif /* DO_DEBUG */ 8128 if (md_set_badblocks(bb, sector, length, !unack)) 8129 return len; 8130 else 8131 return -ENOSPC; 8132 } 8133 8134 static int md_notify_reboot(struct notifier_block *this, 8135 unsigned long code, void *x) 8136 { 8137 struct list_head *tmp; 8138 struct mddev *mddev; 8139 int need_delay = 0; 8140 8141 for_each_mddev(mddev, tmp) { 8142 if (mddev_trylock(mddev)) { 8143 if (mddev->pers) 8144 __md_stop_writes(mddev); 8145 mddev->safemode = 2; 8146 mddev_unlock(mddev); 8147 } 8148 need_delay = 1; 8149 } 8150 /* 8151 * certain more exotic SCSI devices are known to be 8152 * volatile wrt too early system reboots. While the 8153 * right place to handle this issue is the given 8154 * driver, we do want to have a safe RAID driver ... 8155 */ 8156 if (need_delay) 8157 mdelay(1000*1); 8158 8159 return NOTIFY_DONE; 8160 } 8161 8162 static struct notifier_block md_notifier = { 8163 .notifier_call = md_notify_reboot, 8164 .next = NULL, 8165 .priority = INT_MAX, /* before any real devices */ 8166 }; 8167 8168 static void md_geninit(void) 8169 { 8170 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 8171 8172 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); 8173 } 8174 8175 static int __init md_init(void) 8176 { 8177 int ret = -ENOMEM; 8178 8179 md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); 8180 if (!md_wq) 8181 goto err_wq; 8182 8183 md_misc_wq = alloc_workqueue("md_misc", 0, 0); 8184 if (!md_misc_wq) 8185 goto err_misc_wq; 8186 8187 if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) 8188 goto err_md; 8189 8190 if ((ret = register_blkdev(0, "mdp")) < 0) 8191 goto err_mdp; 8192 mdp_major = ret; 8193 8194 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, 8195 md_probe, NULL, NULL); 8196 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, 8197 md_probe, NULL, NULL); 8198 8199 register_reboot_notifier(&md_notifier); 8200 raid_table_header = register_sysctl_table(raid_root_table); 8201 8202 md_geninit(); 8203 return 0; 8204 8205 err_mdp: 8206 unregister_blkdev(MD_MAJOR, "md"); 8207 err_md: 8208 destroy_workqueue(md_misc_wq); 8209 err_misc_wq: 8210 destroy_workqueue(md_wq); 8211 err_wq: 8212 return ret; 8213 } 8214 8215 #ifndef MODULE 8216 8217 /* 8218 * Searches all registered partitions for autorun RAID arrays 8219 * at boot time. 8220 */ 8221 8222 static LIST_HEAD(all_detected_devices); 8223 struct detected_devices_node { 8224 struct list_head list; 8225 dev_t dev; 8226 }; 8227 8228 void md_autodetect_dev(dev_t dev) 8229 { 8230 struct detected_devices_node *node_detected_dev; 8231 8232 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); 8233 if (node_detected_dev) { 8234 node_detected_dev->dev = dev; 8235 list_add_tail(&node_detected_dev->list, &all_detected_devices); 8236 } else { 8237 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" 8238 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); 8239 } 8240 } 8241 8242 8243 static void autostart_arrays(int part) 8244 { 8245 struct md_rdev *rdev; 8246 struct detected_devices_node *node_detected_dev; 8247 dev_t dev; 8248 int i_scanned, i_passed; 8249 8250 i_scanned = 0; 8251 i_passed = 0; 8252 8253 printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); 8254 8255 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { 8256 i_scanned++; 8257 node_detected_dev = list_entry(all_detected_devices.next, 8258 struct detected_devices_node, list); 8259 list_del(&node_detected_dev->list); 8260 dev = node_detected_dev->dev; 8261 kfree(node_detected_dev); 8262 rdev = md_import_device(dev,0, 90); 8263 if (IS_ERR(rdev)) 8264 continue; 8265 8266 if (test_bit(Faulty, &rdev->flags)) { 8267 MD_BUG(); 8268 continue; 8269 } 8270 set_bit(AutoDetected, &rdev->flags); 8271 list_add(&rdev->same_set, &pending_raid_disks); 8272 i_passed++; 8273 } 8274 8275 printk(KERN_INFO "md: Scanned %d and added %d devices.\n", 8276 i_scanned, i_passed); 8277 8278 autorun_devices(part); 8279 } 8280 8281 #endif /* !MODULE */ 8282 8283 static __exit void md_exit(void) 8284 { 8285 struct mddev *mddev; 8286 struct list_head *tmp; 8287 8288 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); 8289 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); 8290 8291 unregister_blkdev(MD_MAJOR,"md"); 8292 unregister_blkdev(mdp_major, "mdp"); 8293 unregister_reboot_notifier(&md_notifier); 8294 unregister_sysctl_table(raid_table_header); 8295 remove_proc_entry("mdstat", NULL); 8296 for_each_mddev(mddev, tmp) { 8297 export_array(mddev); 8298 mddev->hold_active = 0; 8299 } 8300 destroy_workqueue(md_misc_wq); 8301 destroy_workqueue(md_wq); 8302 } 8303 8304 subsys_initcall(md_init); 8305 module_exit(md_exit) 8306 8307 static int get_ro(char *buffer, struct kernel_param *kp) 8308 { 8309 return sprintf(buffer, "%d", start_readonly); 8310 } 8311 static int set_ro(const char *val, struct kernel_param *kp) 8312 { 8313 char *e; 8314 int num = simple_strtoul(val, &e, 10); 8315 if (*val && (*e == '\0' || *e == '\n')) { 8316 start_readonly = num; 8317 return 0; 8318 } 8319 return -EINVAL; 8320 } 8321 8322 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); 8323 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); 8324 8325 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); 8326 8327 EXPORT_SYMBOL(register_md_personality); 8328 EXPORT_SYMBOL(unregister_md_personality); 8329 EXPORT_SYMBOL(md_error); 8330 EXPORT_SYMBOL(md_done_sync); 8331 EXPORT_SYMBOL(md_write_start); 8332 EXPORT_SYMBOL(md_write_end); 8333 EXPORT_SYMBOL(md_register_thread); 8334 EXPORT_SYMBOL(md_unregister_thread); 8335 EXPORT_SYMBOL(md_wakeup_thread); 8336 EXPORT_SYMBOL(md_check_recovery); 8337 MODULE_LICENSE("GPL"); 8338 MODULE_DESCRIPTION("MD RAID framework"); 8339 MODULE_ALIAS("md"); 8340 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 8341