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/buffer_head.h> /* for invalidate_bdev */ 40 #include <linux/poll.h> 41 #include <linux/ctype.h> 42 #include <linux/hdreg.h> 43 #include <linux/proc_fs.h> 44 #include <linux/random.h> 45 #include <linux/reboot.h> 46 #include <linux/file.h> 47 #include <linux/delay.h> 48 #include <linux/raid/md_p.h> 49 #include <linux/raid/md_u.h> 50 #include "md.h" 51 #include "bitmap.h" 52 53 #define DEBUG 0 54 #define dprintk(x...) ((void)(DEBUG && printk(x))) 55 56 57 #ifndef MODULE 58 static void autostart_arrays(int part); 59 #endif 60 61 static LIST_HEAD(pers_list); 62 static DEFINE_SPINLOCK(pers_lock); 63 64 static void md_print_devices(void); 65 66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait); 67 68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } 69 70 /* 71 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' 72 * is 1000 KB/sec, so the extra system load does not show up that much. 73 * Increase it if you want to have more _guaranteed_ speed. Note that 74 * the RAID driver will use the maximum available bandwidth if the IO 75 * subsystem is idle. There is also an 'absolute maximum' reconstruction 76 * speed limit - in case reconstruction slows down your system despite 77 * idle IO detection. 78 * 79 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. 80 * or /sys/block/mdX/md/sync_speed_{min,max} 81 */ 82 83 static int sysctl_speed_limit_min = 1000; 84 static int sysctl_speed_limit_max = 200000; 85 static inline int speed_min(mddev_t *mddev) 86 { 87 return mddev->sync_speed_min ? 88 mddev->sync_speed_min : sysctl_speed_limit_min; 89 } 90 91 static inline int speed_max(mddev_t *mddev) 92 { 93 return mddev->sync_speed_max ? 94 mddev->sync_speed_max : sysctl_speed_limit_max; 95 } 96 97 static struct ctl_table_header *raid_table_header; 98 99 static ctl_table raid_table[] = { 100 { 101 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, 102 .procname = "speed_limit_min", 103 .data = &sysctl_speed_limit_min, 104 .maxlen = sizeof(int), 105 .mode = S_IRUGO|S_IWUSR, 106 .proc_handler = &proc_dointvec, 107 }, 108 { 109 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, 110 .procname = "speed_limit_max", 111 .data = &sysctl_speed_limit_max, 112 .maxlen = sizeof(int), 113 .mode = S_IRUGO|S_IWUSR, 114 .proc_handler = &proc_dointvec, 115 }, 116 { .ctl_name = 0 } 117 }; 118 119 static ctl_table raid_dir_table[] = { 120 { 121 .ctl_name = DEV_RAID, 122 .procname = "raid", 123 .maxlen = 0, 124 .mode = S_IRUGO|S_IXUGO, 125 .child = raid_table, 126 }, 127 { .ctl_name = 0 } 128 }; 129 130 static ctl_table raid_root_table[] = { 131 { 132 .ctl_name = CTL_DEV, 133 .procname = "dev", 134 .maxlen = 0, 135 .mode = 0555, 136 .child = raid_dir_table, 137 }, 138 { .ctl_name = 0 } 139 }; 140 141 static const struct block_device_operations md_fops; 142 143 static int start_readonly; 144 145 /* 146 * We have a system wide 'event count' that is incremented 147 * on any 'interesting' event, and readers of /proc/mdstat 148 * can use 'poll' or 'select' to find out when the event 149 * count increases. 150 * 151 * Events are: 152 * start array, stop array, error, add device, remove device, 153 * start build, activate spare 154 */ 155 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); 156 static atomic_t md_event_count; 157 void md_new_event(mddev_t *mddev) 158 { 159 atomic_inc(&md_event_count); 160 wake_up(&md_event_waiters); 161 } 162 EXPORT_SYMBOL_GPL(md_new_event); 163 164 /* Alternate version that can be called from interrupts 165 * when calling sysfs_notify isn't needed. 166 */ 167 static void md_new_event_inintr(mddev_t *mddev) 168 { 169 atomic_inc(&md_event_count); 170 wake_up(&md_event_waiters); 171 } 172 173 /* 174 * Enables to iterate over all existing md arrays 175 * all_mddevs_lock protects this list. 176 */ 177 static LIST_HEAD(all_mddevs); 178 static DEFINE_SPINLOCK(all_mddevs_lock); 179 180 181 /* 182 * iterates through all used mddevs in the system. 183 * We take care to grab the all_mddevs_lock whenever navigating 184 * the list, and to always hold a refcount when unlocked. 185 * Any code which breaks out of this loop while own 186 * a reference to the current mddev and must mddev_put it. 187 */ 188 #define for_each_mddev(mddev,tmp) \ 189 \ 190 for (({ spin_lock(&all_mddevs_lock); \ 191 tmp = all_mddevs.next; \ 192 mddev = NULL;}); \ 193 ({ if (tmp != &all_mddevs) \ 194 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ 195 spin_unlock(&all_mddevs_lock); \ 196 if (mddev) mddev_put(mddev); \ 197 mddev = list_entry(tmp, mddev_t, all_mddevs); \ 198 tmp != &all_mddevs;}); \ 199 ({ spin_lock(&all_mddevs_lock); \ 200 tmp = tmp->next;}) \ 201 ) 202 203 204 /* Rather than calling directly into the personality make_request function, 205 * IO requests come here first so that we can check if the device is 206 * being suspended pending a reconfiguration. 207 * We hold a refcount over the call to ->make_request. By the time that 208 * call has finished, the bio has been linked into some internal structure 209 * and so is visible to ->quiesce(), so we don't need the refcount any more. 210 */ 211 static int md_make_request(struct request_queue *q, struct bio *bio) 212 { 213 mddev_t *mddev = q->queuedata; 214 int rv; 215 if (mddev == NULL || mddev->pers == NULL) { 216 bio_io_error(bio); 217 return 0; 218 } 219 rcu_read_lock(); 220 if (mddev->suspended) { 221 DEFINE_WAIT(__wait); 222 for (;;) { 223 prepare_to_wait(&mddev->sb_wait, &__wait, 224 TASK_UNINTERRUPTIBLE); 225 if (!mddev->suspended) 226 break; 227 rcu_read_unlock(); 228 schedule(); 229 rcu_read_lock(); 230 } 231 finish_wait(&mddev->sb_wait, &__wait); 232 } 233 atomic_inc(&mddev->active_io); 234 rcu_read_unlock(); 235 rv = mddev->pers->make_request(q, bio); 236 if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) 237 wake_up(&mddev->sb_wait); 238 239 return rv; 240 } 241 242 static void mddev_suspend(mddev_t *mddev) 243 { 244 BUG_ON(mddev->suspended); 245 mddev->suspended = 1; 246 synchronize_rcu(); 247 wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); 248 mddev->pers->quiesce(mddev, 1); 249 md_unregister_thread(mddev->thread); 250 mddev->thread = NULL; 251 /* we now know that no code is executing in the personality module, 252 * except possibly the tail end of a ->bi_end_io function, but that 253 * is certain to complete before the module has a chance to get 254 * unloaded 255 */ 256 } 257 258 static void mddev_resume(mddev_t *mddev) 259 { 260 mddev->suspended = 0; 261 wake_up(&mddev->sb_wait); 262 mddev->pers->quiesce(mddev, 0); 263 } 264 265 int mddev_congested(mddev_t *mddev, int bits) 266 { 267 return mddev->suspended; 268 } 269 EXPORT_SYMBOL(mddev_congested); 270 271 272 static inline mddev_t *mddev_get(mddev_t *mddev) 273 { 274 atomic_inc(&mddev->active); 275 return mddev; 276 } 277 278 static void mddev_delayed_delete(struct work_struct *ws); 279 280 static void mddev_put(mddev_t *mddev) 281 { 282 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) 283 return; 284 if (!mddev->raid_disks && list_empty(&mddev->disks) && 285 !mddev->hold_active) { 286 list_del(&mddev->all_mddevs); 287 if (mddev->gendisk) { 288 /* we did a probe so need to clean up. 289 * Call schedule_work inside the spinlock 290 * so that flush_scheduled_work() after 291 * mddev_find will succeed in waiting for the 292 * work to be done. 293 */ 294 INIT_WORK(&mddev->del_work, mddev_delayed_delete); 295 schedule_work(&mddev->del_work); 296 } else 297 kfree(mddev); 298 } 299 spin_unlock(&all_mddevs_lock); 300 } 301 302 static mddev_t * mddev_find(dev_t unit) 303 { 304 mddev_t *mddev, *new = NULL; 305 306 retry: 307 spin_lock(&all_mddevs_lock); 308 309 if (unit) { 310 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 311 if (mddev->unit == unit) { 312 mddev_get(mddev); 313 spin_unlock(&all_mddevs_lock); 314 kfree(new); 315 return mddev; 316 } 317 318 if (new) { 319 list_add(&new->all_mddevs, &all_mddevs); 320 spin_unlock(&all_mddevs_lock); 321 new->hold_active = UNTIL_IOCTL; 322 return new; 323 } 324 } else if (new) { 325 /* find an unused unit number */ 326 static int next_minor = 512; 327 int start = next_minor; 328 int is_free = 0; 329 int dev = 0; 330 while (!is_free) { 331 dev = MKDEV(MD_MAJOR, next_minor); 332 next_minor++; 333 if (next_minor > MINORMASK) 334 next_minor = 0; 335 if (next_minor == start) { 336 /* Oh dear, all in use. */ 337 spin_unlock(&all_mddevs_lock); 338 kfree(new); 339 return NULL; 340 } 341 342 is_free = 1; 343 list_for_each_entry(mddev, &all_mddevs, all_mddevs) 344 if (mddev->unit == dev) { 345 is_free = 0; 346 break; 347 } 348 } 349 new->unit = dev; 350 new->md_minor = MINOR(dev); 351 new->hold_active = UNTIL_STOP; 352 list_add(&new->all_mddevs, &all_mddevs); 353 spin_unlock(&all_mddevs_lock); 354 return new; 355 } 356 spin_unlock(&all_mddevs_lock); 357 358 new = kzalloc(sizeof(*new), GFP_KERNEL); 359 if (!new) 360 return NULL; 361 362 new->unit = unit; 363 if (MAJOR(unit) == MD_MAJOR) 364 new->md_minor = MINOR(unit); 365 else 366 new->md_minor = MINOR(unit) >> MdpMinorShift; 367 368 mutex_init(&new->open_mutex); 369 mutex_init(&new->reconfig_mutex); 370 INIT_LIST_HEAD(&new->disks); 371 INIT_LIST_HEAD(&new->all_mddevs); 372 init_timer(&new->safemode_timer); 373 atomic_set(&new->active, 1); 374 atomic_set(&new->openers, 0); 375 atomic_set(&new->active_io, 0); 376 spin_lock_init(&new->write_lock); 377 init_waitqueue_head(&new->sb_wait); 378 init_waitqueue_head(&new->recovery_wait); 379 new->reshape_position = MaxSector; 380 new->resync_min = 0; 381 new->resync_max = MaxSector; 382 new->level = LEVEL_NONE; 383 384 goto retry; 385 } 386 387 static inline int mddev_lock(mddev_t * mddev) 388 { 389 return mutex_lock_interruptible(&mddev->reconfig_mutex); 390 } 391 392 static inline int mddev_is_locked(mddev_t *mddev) 393 { 394 return mutex_is_locked(&mddev->reconfig_mutex); 395 } 396 397 static inline int mddev_trylock(mddev_t * mddev) 398 { 399 return mutex_trylock(&mddev->reconfig_mutex); 400 } 401 402 static inline void mddev_unlock(mddev_t * mddev) 403 { 404 mutex_unlock(&mddev->reconfig_mutex); 405 406 md_wakeup_thread(mddev->thread); 407 } 408 409 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) 410 { 411 mdk_rdev_t *rdev; 412 413 list_for_each_entry(rdev, &mddev->disks, same_set) 414 if (rdev->desc_nr == nr) 415 return rdev; 416 417 return NULL; 418 } 419 420 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) 421 { 422 mdk_rdev_t *rdev; 423 424 list_for_each_entry(rdev, &mddev->disks, same_set) 425 if (rdev->bdev->bd_dev == dev) 426 return rdev; 427 428 return NULL; 429 } 430 431 static struct mdk_personality *find_pers(int level, char *clevel) 432 { 433 struct mdk_personality *pers; 434 list_for_each_entry(pers, &pers_list, list) { 435 if (level != LEVEL_NONE && pers->level == level) 436 return pers; 437 if (strcmp(pers->name, clevel)==0) 438 return pers; 439 } 440 return NULL; 441 } 442 443 /* return the offset of the super block in 512byte sectors */ 444 static inline sector_t calc_dev_sboffset(struct block_device *bdev) 445 { 446 sector_t num_sectors = bdev->bd_inode->i_size / 512; 447 return MD_NEW_SIZE_SECTORS(num_sectors); 448 } 449 450 static int alloc_disk_sb(mdk_rdev_t * rdev) 451 { 452 if (rdev->sb_page) 453 MD_BUG(); 454 455 rdev->sb_page = alloc_page(GFP_KERNEL); 456 if (!rdev->sb_page) { 457 printk(KERN_ALERT "md: out of memory.\n"); 458 return -ENOMEM; 459 } 460 461 return 0; 462 } 463 464 static void free_disk_sb(mdk_rdev_t * rdev) 465 { 466 if (rdev->sb_page) { 467 put_page(rdev->sb_page); 468 rdev->sb_loaded = 0; 469 rdev->sb_page = NULL; 470 rdev->sb_start = 0; 471 rdev->sectors = 0; 472 } 473 } 474 475 476 static void super_written(struct bio *bio, int error) 477 { 478 mdk_rdev_t *rdev = bio->bi_private; 479 mddev_t *mddev = rdev->mddev; 480 481 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { 482 printk("md: super_written gets error=%d, uptodate=%d\n", 483 error, test_bit(BIO_UPTODATE, &bio->bi_flags)); 484 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); 485 md_error(mddev, rdev); 486 } 487 488 if (atomic_dec_and_test(&mddev->pending_writes)) 489 wake_up(&mddev->sb_wait); 490 bio_put(bio); 491 } 492 493 static void super_written_barrier(struct bio *bio, int error) 494 { 495 struct bio *bio2 = bio->bi_private; 496 mdk_rdev_t *rdev = bio2->bi_private; 497 mddev_t *mddev = rdev->mddev; 498 499 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && 500 error == -EOPNOTSUPP) { 501 unsigned long flags; 502 /* barriers don't appear to be supported :-( */ 503 set_bit(BarriersNotsupp, &rdev->flags); 504 mddev->barriers_work = 0; 505 spin_lock_irqsave(&mddev->write_lock, flags); 506 bio2->bi_next = mddev->biolist; 507 mddev->biolist = bio2; 508 spin_unlock_irqrestore(&mddev->write_lock, flags); 509 wake_up(&mddev->sb_wait); 510 bio_put(bio); 511 } else { 512 bio_put(bio2); 513 bio->bi_private = rdev; 514 super_written(bio, error); 515 } 516 } 517 518 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, 519 sector_t sector, int size, struct page *page) 520 { 521 /* write first size bytes of page to sector of rdev 522 * Increment mddev->pending_writes before returning 523 * and decrement it on completion, waking up sb_wait 524 * if zero is reached. 525 * If an error occurred, call md_error 526 * 527 * As we might need to resubmit the request if BIO_RW_BARRIER 528 * causes ENOTSUPP, we allocate a spare bio... 529 */ 530 struct bio *bio = bio_alloc(GFP_NOIO, 1); 531 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); 532 533 bio->bi_bdev = rdev->bdev; 534 bio->bi_sector = sector; 535 bio_add_page(bio, page, size, 0); 536 bio->bi_private = rdev; 537 bio->bi_end_io = super_written; 538 bio->bi_rw = rw; 539 540 atomic_inc(&mddev->pending_writes); 541 if (!test_bit(BarriersNotsupp, &rdev->flags)) { 542 struct bio *rbio; 543 rw |= (1<<BIO_RW_BARRIER); 544 rbio = bio_clone(bio, GFP_NOIO); 545 rbio->bi_private = bio; 546 rbio->bi_end_io = super_written_barrier; 547 submit_bio(rw, rbio); 548 } else 549 submit_bio(rw, bio); 550 } 551 552 void md_super_wait(mddev_t *mddev) 553 { 554 /* wait for all superblock writes that were scheduled to complete. 555 * if any had to be retried (due to BARRIER problems), retry them 556 */ 557 DEFINE_WAIT(wq); 558 for(;;) { 559 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); 560 if (atomic_read(&mddev->pending_writes)==0) 561 break; 562 while (mddev->biolist) { 563 struct bio *bio; 564 spin_lock_irq(&mddev->write_lock); 565 bio = mddev->biolist; 566 mddev->biolist = bio->bi_next ; 567 bio->bi_next = NULL; 568 spin_unlock_irq(&mddev->write_lock); 569 submit_bio(bio->bi_rw, bio); 570 } 571 schedule(); 572 } 573 finish_wait(&mddev->sb_wait, &wq); 574 } 575 576 static void bi_complete(struct bio *bio, int error) 577 { 578 complete((struct completion*)bio->bi_private); 579 } 580 581 int sync_page_io(struct block_device *bdev, sector_t sector, int size, 582 struct page *page, int rw) 583 { 584 struct bio *bio = bio_alloc(GFP_NOIO, 1); 585 struct completion event; 586 int ret; 587 588 rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); 589 590 bio->bi_bdev = bdev; 591 bio->bi_sector = sector; 592 bio_add_page(bio, page, size, 0); 593 init_completion(&event); 594 bio->bi_private = &event; 595 bio->bi_end_io = bi_complete; 596 submit_bio(rw, bio); 597 wait_for_completion(&event); 598 599 ret = test_bit(BIO_UPTODATE, &bio->bi_flags); 600 bio_put(bio); 601 return ret; 602 } 603 EXPORT_SYMBOL_GPL(sync_page_io); 604 605 static int read_disk_sb(mdk_rdev_t * rdev, int size) 606 { 607 char b[BDEVNAME_SIZE]; 608 if (!rdev->sb_page) { 609 MD_BUG(); 610 return -EINVAL; 611 } 612 if (rdev->sb_loaded) 613 return 0; 614 615 616 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) 617 goto fail; 618 rdev->sb_loaded = 1; 619 return 0; 620 621 fail: 622 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", 623 bdevname(rdev->bdev,b)); 624 return -EINVAL; 625 } 626 627 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) 628 { 629 return sb1->set_uuid0 == sb2->set_uuid0 && 630 sb1->set_uuid1 == sb2->set_uuid1 && 631 sb1->set_uuid2 == sb2->set_uuid2 && 632 sb1->set_uuid3 == sb2->set_uuid3; 633 } 634 635 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) 636 { 637 int ret; 638 mdp_super_t *tmp1, *tmp2; 639 640 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); 641 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); 642 643 if (!tmp1 || !tmp2) { 644 ret = 0; 645 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); 646 goto abort; 647 } 648 649 *tmp1 = *sb1; 650 *tmp2 = *sb2; 651 652 /* 653 * nr_disks is not constant 654 */ 655 tmp1->nr_disks = 0; 656 tmp2->nr_disks = 0; 657 658 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); 659 abort: 660 kfree(tmp1); 661 kfree(tmp2); 662 return ret; 663 } 664 665 666 static u32 md_csum_fold(u32 csum) 667 { 668 csum = (csum & 0xffff) + (csum >> 16); 669 return (csum & 0xffff) + (csum >> 16); 670 } 671 672 static unsigned int calc_sb_csum(mdp_super_t * sb) 673 { 674 u64 newcsum = 0; 675 u32 *sb32 = (u32*)sb; 676 int i; 677 unsigned int disk_csum, csum; 678 679 disk_csum = sb->sb_csum; 680 sb->sb_csum = 0; 681 682 for (i = 0; i < MD_SB_BYTES/4 ; i++) 683 newcsum += sb32[i]; 684 csum = (newcsum & 0xffffffff) + (newcsum>>32); 685 686 687 #ifdef CONFIG_ALPHA 688 /* This used to use csum_partial, which was wrong for several 689 * reasons including that different results are returned on 690 * different architectures. It isn't critical that we get exactly 691 * the same return value as before (we always csum_fold before 692 * testing, and that removes any differences). However as we 693 * know that csum_partial always returned a 16bit value on 694 * alphas, do a fold to maximise conformity to previous behaviour. 695 */ 696 sb->sb_csum = md_csum_fold(disk_csum); 697 #else 698 sb->sb_csum = disk_csum; 699 #endif 700 return csum; 701 } 702 703 704 /* 705 * Handle superblock details. 706 * We want to be able to handle multiple superblock formats 707 * so we have a common interface to them all, and an array of 708 * different handlers. 709 * We rely on user-space to write the initial superblock, and support 710 * reading and updating of superblocks. 711 * Interface methods are: 712 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) 713 * loads and validates a superblock on dev. 714 * if refdev != NULL, compare superblocks on both devices 715 * Return: 716 * 0 - dev has a superblock that is compatible with refdev 717 * 1 - dev has a superblock that is compatible and newer than refdev 718 * so dev should be used as the refdev in future 719 * -EINVAL superblock incompatible or invalid 720 * -othererror e.g. -EIO 721 * 722 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) 723 * Verify that dev is acceptable into mddev. 724 * The first time, mddev->raid_disks will be 0, and data from 725 * dev should be merged in. Subsequent calls check that dev 726 * is new enough. Return 0 or -EINVAL 727 * 728 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) 729 * Update the superblock for rdev with data in mddev 730 * This does not write to disc. 731 * 732 */ 733 734 struct super_type { 735 char *name; 736 struct module *owner; 737 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, 738 int minor_version); 739 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); 740 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); 741 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, 742 sector_t num_sectors); 743 }; 744 745 /* 746 * Check that the given mddev has no bitmap. 747 * 748 * This function is called from the run method of all personalities that do not 749 * support bitmaps. It prints an error message and returns non-zero if mddev 750 * has a bitmap. Otherwise, it returns 0. 751 * 752 */ 753 int md_check_no_bitmap(mddev_t *mddev) 754 { 755 if (!mddev->bitmap_file && !mddev->bitmap_offset) 756 return 0; 757 printk(KERN_ERR "%s: bitmaps are not supported for %s\n", 758 mdname(mddev), mddev->pers->name); 759 return 1; 760 } 761 EXPORT_SYMBOL(md_check_no_bitmap); 762 763 /* 764 * load_super for 0.90.0 765 */ 766 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 767 { 768 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 769 mdp_super_t *sb; 770 int ret; 771 772 /* 773 * Calculate the position of the superblock (512byte sectors), 774 * it's at the end of the disk. 775 * 776 * It also happens to be a multiple of 4Kb. 777 */ 778 rdev->sb_start = calc_dev_sboffset(rdev->bdev); 779 780 ret = read_disk_sb(rdev, MD_SB_BYTES); 781 if (ret) return ret; 782 783 ret = -EINVAL; 784 785 bdevname(rdev->bdev, b); 786 sb = (mdp_super_t*)page_address(rdev->sb_page); 787 788 if (sb->md_magic != MD_SB_MAGIC) { 789 printk(KERN_ERR "md: invalid raid superblock magic on %s\n", 790 b); 791 goto abort; 792 } 793 794 if (sb->major_version != 0 || 795 sb->minor_version < 90 || 796 sb->minor_version > 91) { 797 printk(KERN_WARNING "Bad version number %d.%d on %s\n", 798 sb->major_version, sb->minor_version, 799 b); 800 goto abort; 801 } 802 803 if (sb->raid_disks <= 0) 804 goto abort; 805 806 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { 807 printk(KERN_WARNING "md: invalid superblock checksum on %s\n", 808 b); 809 goto abort; 810 } 811 812 rdev->preferred_minor = sb->md_minor; 813 rdev->data_offset = 0; 814 rdev->sb_size = MD_SB_BYTES; 815 816 if (sb->level == LEVEL_MULTIPATH) 817 rdev->desc_nr = -1; 818 else 819 rdev->desc_nr = sb->this_disk.number; 820 821 if (!refdev) { 822 ret = 1; 823 } else { 824 __u64 ev1, ev2; 825 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); 826 if (!uuid_equal(refsb, sb)) { 827 printk(KERN_WARNING "md: %s has different UUID to %s\n", 828 b, bdevname(refdev->bdev,b2)); 829 goto abort; 830 } 831 if (!sb_equal(refsb, sb)) { 832 printk(KERN_WARNING "md: %s has same UUID" 833 " but different superblock to %s\n", 834 b, bdevname(refdev->bdev, b2)); 835 goto abort; 836 } 837 ev1 = md_event(sb); 838 ev2 = md_event(refsb); 839 if (ev1 > ev2) 840 ret = 1; 841 else 842 ret = 0; 843 } 844 rdev->sectors = rdev->sb_start; 845 846 if (rdev->sectors < sb->size * 2 && sb->level > 1) 847 /* "this cannot possibly happen" ... */ 848 ret = -EINVAL; 849 850 abort: 851 return ret; 852 } 853 854 /* 855 * validate_super for 0.90.0 856 */ 857 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) 858 { 859 mdp_disk_t *desc; 860 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); 861 __u64 ev1 = md_event(sb); 862 863 rdev->raid_disk = -1; 864 clear_bit(Faulty, &rdev->flags); 865 clear_bit(In_sync, &rdev->flags); 866 clear_bit(WriteMostly, &rdev->flags); 867 clear_bit(BarriersNotsupp, &rdev->flags); 868 869 if (mddev->raid_disks == 0) { 870 mddev->major_version = 0; 871 mddev->minor_version = sb->minor_version; 872 mddev->patch_version = sb->patch_version; 873 mddev->external = 0; 874 mddev->chunk_sectors = sb->chunk_size >> 9; 875 mddev->ctime = sb->ctime; 876 mddev->utime = sb->utime; 877 mddev->level = sb->level; 878 mddev->clevel[0] = 0; 879 mddev->layout = sb->layout; 880 mddev->raid_disks = sb->raid_disks; 881 mddev->dev_sectors = sb->size * 2; 882 mddev->events = ev1; 883 mddev->bitmap_offset = 0; 884 mddev->default_bitmap_offset = MD_SB_BYTES >> 9; 885 886 if (mddev->minor_version >= 91) { 887 mddev->reshape_position = sb->reshape_position; 888 mddev->delta_disks = sb->delta_disks; 889 mddev->new_level = sb->new_level; 890 mddev->new_layout = sb->new_layout; 891 mddev->new_chunk_sectors = sb->new_chunk >> 9; 892 } else { 893 mddev->reshape_position = MaxSector; 894 mddev->delta_disks = 0; 895 mddev->new_level = mddev->level; 896 mddev->new_layout = mddev->layout; 897 mddev->new_chunk_sectors = mddev->chunk_sectors; 898 } 899 900 if (sb->state & (1<<MD_SB_CLEAN)) 901 mddev->recovery_cp = MaxSector; 902 else { 903 if (sb->events_hi == sb->cp_events_hi && 904 sb->events_lo == sb->cp_events_lo) { 905 mddev->recovery_cp = sb->recovery_cp; 906 } else 907 mddev->recovery_cp = 0; 908 } 909 910 memcpy(mddev->uuid+0, &sb->set_uuid0, 4); 911 memcpy(mddev->uuid+4, &sb->set_uuid1, 4); 912 memcpy(mddev->uuid+8, &sb->set_uuid2, 4); 913 memcpy(mddev->uuid+12,&sb->set_uuid3, 4); 914 915 mddev->max_disks = MD_SB_DISKS; 916 917 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && 918 mddev->bitmap_file == NULL) 919 mddev->bitmap_offset = mddev->default_bitmap_offset; 920 921 } else if (mddev->pers == NULL) { 922 /* Insist on good event counter while assembling */ 923 ++ev1; 924 if (ev1 < mddev->events) 925 return -EINVAL; 926 } else if (mddev->bitmap) { 927 /* if adding to array with a bitmap, then we can accept an 928 * older device ... but not too old. 929 */ 930 if (ev1 < mddev->bitmap->events_cleared) 931 return 0; 932 } else { 933 if (ev1 < mddev->events) 934 /* just a hot-add of a new device, leave raid_disk at -1 */ 935 return 0; 936 } 937 938 if (mddev->level != LEVEL_MULTIPATH) { 939 desc = sb->disks + rdev->desc_nr; 940 941 if (desc->state & (1<<MD_DISK_FAULTY)) 942 set_bit(Faulty, &rdev->flags); 943 else if (desc->state & (1<<MD_DISK_SYNC) /* && 944 desc->raid_disk < mddev->raid_disks */) { 945 set_bit(In_sync, &rdev->flags); 946 rdev->raid_disk = desc->raid_disk; 947 } else if (desc->state & (1<<MD_DISK_ACTIVE)) { 948 /* active but not in sync implies recovery up to 949 * reshape position. We don't know exactly where 950 * that is, so set to zero for now */ 951 if (mddev->minor_version >= 91) { 952 rdev->recovery_offset = 0; 953 rdev->raid_disk = desc->raid_disk; 954 } 955 } 956 if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) 957 set_bit(WriteMostly, &rdev->flags); 958 } else /* MULTIPATH are always insync */ 959 set_bit(In_sync, &rdev->flags); 960 return 0; 961 } 962 963 /* 964 * sync_super for 0.90.0 965 */ 966 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) 967 { 968 mdp_super_t *sb; 969 mdk_rdev_t *rdev2; 970 int next_spare = mddev->raid_disks; 971 972 973 /* make rdev->sb match mddev data.. 974 * 975 * 1/ zero out disks 976 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); 977 * 3/ any empty disks < next_spare become removed 978 * 979 * disks[0] gets initialised to REMOVED because 980 * we cannot be sure from other fields if it has 981 * been initialised or not. 982 */ 983 int i; 984 int active=0, working=0,failed=0,spare=0,nr_disks=0; 985 986 rdev->sb_size = MD_SB_BYTES; 987 988 sb = (mdp_super_t*)page_address(rdev->sb_page); 989 990 memset(sb, 0, sizeof(*sb)); 991 992 sb->md_magic = MD_SB_MAGIC; 993 sb->major_version = mddev->major_version; 994 sb->patch_version = mddev->patch_version; 995 sb->gvalid_words = 0; /* ignored */ 996 memcpy(&sb->set_uuid0, mddev->uuid+0, 4); 997 memcpy(&sb->set_uuid1, mddev->uuid+4, 4); 998 memcpy(&sb->set_uuid2, mddev->uuid+8, 4); 999 memcpy(&sb->set_uuid3, mddev->uuid+12,4); 1000 1001 sb->ctime = mddev->ctime; 1002 sb->level = mddev->level; 1003 sb->size = mddev->dev_sectors / 2; 1004 sb->raid_disks = mddev->raid_disks; 1005 sb->md_minor = mddev->md_minor; 1006 sb->not_persistent = 0; 1007 sb->utime = mddev->utime; 1008 sb->state = 0; 1009 sb->events_hi = (mddev->events>>32); 1010 sb->events_lo = (u32)mddev->events; 1011 1012 if (mddev->reshape_position == MaxSector) 1013 sb->minor_version = 90; 1014 else { 1015 sb->minor_version = 91; 1016 sb->reshape_position = mddev->reshape_position; 1017 sb->new_level = mddev->new_level; 1018 sb->delta_disks = mddev->delta_disks; 1019 sb->new_layout = mddev->new_layout; 1020 sb->new_chunk = mddev->new_chunk_sectors << 9; 1021 } 1022 mddev->minor_version = sb->minor_version; 1023 if (mddev->in_sync) 1024 { 1025 sb->recovery_cp = mddev->recovery_cp; 1026 sb->cp_events_hi = (mddev->events>>32); 1027 sb->cp_events_lo = (u32)mddev->events; 1028 if (mddev->recovery_cp == MaxSector) 1029 sb->state = (1<< MD_SB_CLEAN); 1030 } else 1031 sb->recovery_cp = 0; 1032 1033 sb->layout = mddev->layout; 1034 sb->chunk_size = mddev->chunk_sectors << 9; 1035 1036 if (mddev->bitmap && mddev->bitmap_file == NULL) 1037 sb->state |= (1<<MD_SB_BITMAP_PRESENT); 1038 1039 sb->disks[0].state = (1<<MD_DISK_REMOVED); 1040 list_for_each_entry(rdev2, &mddev->disks, same_set) { 1041 mdp_disk_t *d; 1042 int desc_nr; 1043 int is_active = test_bit(In_sync, &rdev2->flags); 1044 1045 if (rdev2->raid_disk >= 0 && 1046 sb->minor_version >= 91) 1047 /* we have nowhere to store the recovery_offset, 1048 * but if it is not below the reshape_position, 1049 * we can piggy-back on that. 1050 */ 1051 is_active = 1; 1052 if (rdev2->raid_disk < 0 || 1053 test_bit(Faulty, &rdev2->flags)) 1054 is_active = 0; 1055 if (is_active) 1056 desc_nr = rdev2->raid_disk; 1057 else 1058 desc_nr = next_spare++; 1059 rdev2->desc_nr = desc_nr; 1060 d = &sb->disks[rdev2->desc_nr]; 1061 nr_disks++; 1062 d->number = rdev2->desc_nr; 1063 d->major = MAJOR(rdev2->bdev->bd_dev); 1064 d->minor = MINOR(rdev2->bdev->bd_dev); 1065 if (is_active) 1066 d->raid_disk = rdev2->raid_disk; 1067 else 1068 d->raid_disk = rdev2->desc_nr; /* compatibility */ 1069 if (test_bit(Faulty, &rdev2->flags)) 1070 d->state = (1<<MD_DISK_FAULTY); 1071 else if (is_active) { 1072 d->state = (1<<MD_DISK_ACTIVE); 1073 if (test_bit(In_sync, &rdev2->flags)) 1074 d->state |= (1<<MD_DISK_SYNC); 1075 active++; 1076 working++; 1077 } else { 1078 d->state = 0; 1079 spare++; 1080 working++; 1081 } 1082 if (test_bit(WriteMostly, &rdev2->flags)) 1083 d->state |= (1<<MD_DISK_WRITEMOSTLY); 1084 } 1085 /* now set the "removed" and "faulty" bits on any missing devices */ 1086 for (i=0 ; i < mddev->raid_disks ; i++) { 1087 mdp_disk_t *d = &sb->disks[i]; 1088 if (d->state == 0 && d->number == 0) { 1089 d->number = i; 1090 d->raid_disk = i; 1091 d->state = (1<<MD_DISK_REMOVED); 1092 d->state |= (1<<MD_DISK_FAULTY); 1093 failed++; 1094 } 1095 } 1096 sb->nr_disks = nr_disks; 1097 sb->active_disks = active; 1098 sb->working_disks = working; 1099 sb->failed_disks = failed; 1100 sb->spare_disks = spare; 1101 1102 sb->this_disk = sb->disks[rdev->desc_nr]; 1103 sb->sb_csum = calc_sb_csum(sb); 1104 } 1105 1106 /* 1107 * rdev_size_change for 0.90.0 1108 */ 1109 static unsigned long long 1110 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) 1111 { 1112 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1113 return 0; /* component must fit device */ 1114 if (rdev->mddev->bitmap_offset) 1115 return 0; /* can't move bitmap */ 1116 rdev->sb_start = calc_dev_sboffset(rdev->bdev); 1117 if (!num_sectors || num_sectors > rdev->sb_start) 1118 num_sectors = rdev->sb_start; 1119 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1120 rdev->sb_page); 1121 md_super_wait(rdev->mddev); 1122 return num_sectors / 2; /* kB for sysfs */ 1123 } 1124 1125 1126 /* 1127 * version 1 superblock 1128 */ 1129 1130 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) 1131 { 1132 __le32 disk_csum; 1133 u32 csum; 1134 unsigned long long newcsum; 1135 int size = 256 + le32_to_cpu(sb->max_dev)*2; 1136 __le32 *isuper = (__le32*)sb; 1137 int i; 1138 1139 disk_csum = sb->sb_csum; 1140 sb->sb_csum = 0; 1141 newcsum = 0; 1142 for (i=0; size>=4; size -= 4 ) 1143 newcsum += le32_to_cpu(*isuper++); 1144 1145 if (size == 2) 1146 newcsum += le16_to_cpu(*(__le16*) isuper); 1147 1148 csum = (newcsum & 0xffffffff) + (newcsum >> 32); 1149 sb->sb_csum = disk_csum; 1150 return cpu_to_le32(csum); 1151 } 1152 1153 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) 1154 { 1155 struct mdp_superblock_1 *sb; 1156 int ret; 1157 sector_t sb_start; 1158 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 1159 int bmask; 1160 1161 /* 1162 * Calculate the position of the superblock in 512byte sectors. 1163 * It is always aligned to a 4K boundary and 1164 * depeding on minor_version, it can be: 1165 * 0: At least 8K, but less than 12K, from end of device 1166 * 1: At start of device 1167 * 2: 4K from start of device. 1168 */ 1169 switch(minor_version) { 1170 case 0: 1171 sb_start = rdev->bdev->bd_inode->i_size >> 9; 1172 sb_start -= 8*2; 1173 sb_start &= ~(sector_t)(4*2-1); 1174 break; 1175 case 1: 1176 sb_start = 0; 1177 break; 1178 case 2: 1179 sb_start = 8; 1180 break; 1181 default: 1182 return -EINVAL; 1183 } 1184 rdev->sb_start = sb_start; 1185 1186 /* superblock is rarely larger than 1K, but it can be larger, 1187 * and it is safe to read 4k, so we do that 1188 */ 1189 ret = read_disk_sb(rdev, 4096); 1190 if (ret) return ret; 1191 1192 1193 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1194 1195 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || 1196 sb->major_version != cpu_to_le32(1) || 1197 le32_to_cpu(sb->max_dev) > (4096-256)/2 || 1198 le64_to_cpu(sb->super_offset) != rdev->sb_start || 1199 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) 1200 return -EINVAL; 1201 1202 if (calc_sb_1_csum(sb) != sb->sb_csum) { 1203 printk("md: invalid superblock checksum on %s\n", 1204 bdevname(rdev->bdev,b)); 1205 return -EINVAL; 1206 } 1207 if (le64_to_cpu(sb->data_size) < 10) { 1208 printk("md: data_size too small on %s\n", 1209 bdevname(rdev->bdev,b)); 1210 return -EINVAL; 1211 } 1212 1213 rdev->preferred_minor = 0xffff; 1214 rdev->data_offset = le64_to_cpu(sb->data_offset); 1215 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); 1216 1217 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; 1218 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1219 if (rdev->sb_size & bmask) 1220 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1221 1222 if (minor_version 1223 && rdev->data_offset < sb_start + (rdev->sb_size/512)) 1224 return -EINVAL; 1225 1226 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) 1227 rdev->desc_nr = -1; 1228 else 1229 rdev->desc_nr = le32_to_cpu(sb->dev_number); 1230 1231 if (!refdev) { 1232 ret = 1; 1233 } else { 1234 __u64 ev1, ev2; 1235 struct mdp_superblock_1 *refsb = 1236 (struct mdp_superblock_1*)page_address(refdev->sb_page); 1237 1238 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || 1239 sb->level != refsb->level || 1240 sb->layout != refsb->layout || 1241 sb->chunksize != refsb->chunksize) { 1242 printk(KERN_WARNING "md: %s has strangely different" 1243 " superblock to %s\n", 1244 bdevname(rdev->bdev,b), 1245 bdevname(refdev->bdev,b2)); 1246 return -EINVAL; 1247 } 1248 ev1 = le64_to_cpu(sb->events); 1249 ev2 = le64_to_cpu(refsb->events); 1250 1251 if (ev1 > ev2) 1252 ret = 1; 1253 else 1254 ret = 0; 1255 } 1256 if (minor_version) 1257 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - 1258 le64_to_cpu(sb->data_offset); 1259 else 1260 rdev->sectors = rdev->sb_start; 1261 if (rdev->sectors < le64_to_cpu(sb->data_size)) 1262 return -EINVAL; 1263 rdev->sectors = le64_to_cpu(sb->data_size); 1264 if (le64_to_cpu(sb->size) > rdev->sectors) 1265 return -EINVAL; 1266 return ret; 1267 } 1268 1269 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) 1270 { 1271 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1272 __u64 ev1 = le64_to_cpu(sb->events); 1273 1274 rdev->raid_disk = -1; 1275 clear_bit(Faulty, &rdev->flags); 1276 clear_bit(In_sync, &rdev->flags); 1277 clear_bit(WriteMostly, &rdev->flags); 1278 clear_bit(BarriersNotsupp, &rdev->flags); 1279 1280 if (mddev->raid_disks == 0) { 1281 mddev->major_version = 1; 1282 mddev->patch_version = 0; 1283 mddev->external = 0; 1284 mddev->chunk_sectors = le32_to_cpu(sb->chunksize); 1285 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); 1286 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); 1287 mddev->level = le32_to_cpu(sb->level); 1288 mddev->clevel[0] = 0; 1289 mddev->layout = le32_to_cpu(sb->layout); 1290 mddev->raid_disks = le32_to_cpu(sb->raid_disks); 1291 mddev->dev_sectors = le64_to_cpu(sb->size); 1292 mddev->events = ev1; 1293 mddev->bitmap_offset = 0; 1294 mddev->default_bitmap_offset = 1024 >> 9; 1295 1296 mddev->recovery_cp = le64_to_cpu(sb->resync_offset); 1297 memcpy(mddev->uuid, sb->set_uuid, 16); 1298 1299 mddev->max_disks = (4096-256)/2; 1300 1301 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && 1302 mddev->bitmap_file == NULL ) 1303 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); 1304 1305 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { 1306 mddev->reshape_position = le64_to_cpu(sb->reshape_position); 1307 mddev->delta_disks = le32_to_cpu(sb->delta_disks); 1308 mddev->new_level = le32_to_cpu(sb->new_level); 1309 mddev->new_layout = le32_to_cpu(sb->new_layout); 1310 mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); 1311 } else { 1312 mddev->reshape_position = MaxSector; 1313 mddev->delta_disks = 0; 1314 mddev->new_level = mddev->level; 1315 mddev->new_layout = mddev->layout; 1316 mddev->new_chunk_sectors = mddev->chunk_sectors; 1317 } 1318 1319 } else if (mddev->pers == NULL) { 1320 /* Insist of good event counter while assembling */ 1321 ++ev1; 1322 if (ev1 < mddev->events) 1323 return -EINVAL; 1324 } else if (mddev->bitmap) { 1325 /* If adding to array with a bitmap, then we can accept an 1326 * older device, but not too old. 1327 */ 1328 if (ev1 < mddev->bitmap->events_cleared) 1329 return 0; 1330 } else { 1331 if (ev1 < mddev->events) 1332 /* just a hot-add of a new device, leave raid_disk at -1 */ 1333 return 0; 1334 } 1335 if (mddev->level != LEVEL_MULTIPATH) { 1336 int role; 1337 if (rdev->desc_nr < 0 || 1338 rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { 1339 role = 0xffff; 1340 rdev->desc_nr = -1; 1341 } else 1342 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); 1343 switch(role) { 1344 case 0xffff: /* spare */ 1345 break; 1346 case 0xfffe: /* faulty */ 1347 set_bit(Faulty, &rdev->flags); 1348 break; 1349 default: 1350 if ((le32_to_cpu(sb->feature_map) & 1351 MD_FEATURE_RECOVERY_OFFSET)) 1352 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); 1353 else 1354 set_bit(In_sync, &rdev->flags); 1355 rdev->raid_disk = role; 1356 break; 1357 } 1358 if (sb->devflags & WriteMostly1) 1359 set_bit(WriteMostly, &rdev->flags); 1360 } else /* MULTIPATH are always insync */ 1361 set_bit(In_sync, &rdev->flags); 1362 1363 return 0; 1364 } 1365 1366 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) 1367 { 1368 struct mdp_superblock_1 *sb; 1369 mdk_rdev_t *rdev2; 1370 int max_dev, i; 1371 /* make rdev->sb match mddev and rdev data. */ 1372 1373 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); 1374 1375 sb->feature_map = 0; 1376 sb->pad0 = 0; 1377 sb->recovery_offset = cpu_to_le64(0); 1378 memset(sb->pad1, 0, sizeof(sb->pad1)); 1379 memset(sb->pad2, 0, sizeof(sb->pad2)); 1380 memset(sb->pad3, 0, sizeof(sb->pad3)); 1381 1382 sb->utime = cpu_to_le64((__u64)mddev->utime); 1383 sb->events = cpu_to_le64(mddev->events); 1384 if (mddev->in_sync) 1385 sb->resync_offset = cpu_to_le64(mddev->recovery_cp); 1386 else 1387 sb->resync_offset = cpu_to_le64(0); 1388 1389 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); 1390 1391 sb->raid_disks = cpu_to_le32(mddev->raid_disks); 1392 sb->size = cpu_to_le64(mddev->dev_sectors); 1393 sb->chunksize = cpu_to_le32(mddev->chunk_sectors); 1394 sb->level = cpu_to_le32(mddev->level); 1395 sb->layout = cpu_to_le32(mddev->layout); 1396 1397 if (mddev->bitmap && mddev->bitmap_file == NULL) { 1398 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); 1399 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); 1400 } 1401 1402 if (rdev->raid_disk >= 0 && 1403 !test_bit(In_sync, &rdev->flags)) { 1404 if (rdev->recovery_offset > 0) { 1405 sb->feature_map |= 1406 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); 1407 sb->recovery_offset = 1408 cpu_to_le64(rdev->recovery_offset); 1409 } 1410 } 1411 1412 if (mddev->reshape_position != MaxSector) { 1413 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); 1414 sb->reshape_position = cpu_to_le64(mddev->reshape_position); 1415 sb->new_layout = cpu_to_le32(mddev->new_layout); 1416 sb->delta_disks = cpu_to_le32(mddev->delta_disks); 1417 sb->new_level = cpu_to_le32(mddev->new_level); 1418 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); 1419 } 1420 1421 max_dev = 0; 1422 list_for_each_entry(rdev2, &mddev->disks, same_set) 1423 if (rdev2->desc_nr+1 > max_dev) 1424 max_dev = rdev2->desc_nr+1; 1425 1426 if (max_dev > le32_to_cpu(sb->max_dev)) { 1427 int bmask; 1428 sb->max_dev = cpu_to_le32(max_dev); 1429 rdev->sb_size = max_dev * 2 + 256; 1430 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; 1431 if (rdev->sb_size & bmask) 1432 rdev->sb_size = (rdev->sb_size | bmask) + 1; 1433 } 1434 for (i=0; i<max_dev;i++) 1435 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1436 1437 list_for_each_entry(rdev2, &mddev->disks, same_set) { 1438 i = rdev2->desc_nr; 1439 if (test_bit(Faulty, &rdev2->flags)) 1440 sb->dev_roles[i] = cpu_to_le16(0xfffe); 1441 else if (test_bit(In_sync, &rdev2->flags)) 1442 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1443 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) 1444 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); 1445 else 1446 sb->dev_roles[i] = cpu_to_le16(0xffff); 1447 } 1448 1449 sb->sb_csum = calc_sb_1_csum(sb); 1450 } 1451 1452 static unsigned long long 1453 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) 1454 { 1455 struct mdp_superblock_1 *sb; 1456 sector_t max_sectors; 1457 if (num_sectors && num_sectors < rdev->mddev->dev_sectors) 1458 return 0; /* component must fit device */ 1459 if (rdev->sb_start < rdev->data_offset) { 1460 /* minor versions 1 and 2; superblock before data */ 1461 max_sectors = rdev->bdev->bd_inode->i_size >> 9; 1462 max_sectors -= rdev->data_offset; 1463 if (!num_sectors || num_sectors > max_sectors) 1464 num_sectors = max_sectors; 1465 } else if (rdev->mddev->bitmap_offset) { 1466 /* minor version 0 with bitmap we can't move */ 1467 return 0; 1468 } else { 1469 /* minor version 0; superblock after data */ 1470 sector_t sb_start; 1471 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; 1472 sb_start &= ~(sector_t)(4*2 - 1); 1473 max_sectors = rdev->sectors + sb_start - rdev->sb_start; 1474 if (!num_sectors || num_sectors > max_sectors) 1475 num_sectors = max_sectors; 1476 rdev->sb_start = sb_start; 1477 } 1478 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); 1479 sb->data_size = cpu_to_le64(num_sectors); 1480 sb->super_offset = rdev->sb_start; 1481 sb->sb_csum = calc_sb_1_csum(sb); 1482 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, 1483 rdev->sb_page); 1484 md_super_wait(rdev->mddev); 1485 return num_sectors / 2; /* kB for sysfs */ 1486 } 1487 1488 static struct super_type super_types[] = { 1489 [0] = { 1490 .name = "0.90.0", 1491 .owner = THIS_MODULE, 1492 .load_super = super_90_load, 1493 .validate_super = super_90_validate, 1494 .sync_super = super_90_sync, 1495 .rdev_size_change = super_90_rdev_size_change, 1496 }, 1497 [1] = { 1498 .name = "md-1", 1499 .owner = THIS_MODULE, 1500 .load_super = super_1_load, 1501 .validate_super = super_1_validate, 1502 .sync_super = super_1_sync, 1503 .rdev_size_change = super_1_rdev_size_change, 1504 }, 1505 }; 1506 1507 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) 1508 { 1509 mdk_rdev_t *rdev, *rdev2; 1510 1511 rcu_read_lock(); 1512 rdev_for_each_rcu(rdev, mddev1) 1513 rdev_for_each_rcu(rdev2, mddev2) 1514 if (rdev->bdev->bd_contains == 1515 rdev2->bdev->bd_contains) { 1516 rcu_read_unlock(); 1517 return 1; 1518 } 1519 rcu_read_unlock(); 1520 return 0; 1521 } 1522 1523 static LIST_HEAD(pending_raid_disks); 1524 1525 /* 1526 * Try to register data integrity profile for an mddev 1527 * 1528 * This is called when an array is started and after a disk has been kicked 1529 * from the array. It only succeeds if all working and active component devices 1530 * are integrity capable with matching profiles. 1531 */ 1532 int md_integrity_register(mddev_t *mddev) 1533 { 1534 mdk_rdev_t *rdev, *reference = NULL; 1535 1536 if (list_empty(&mddev->disks)) 1537 return 0; /* nothing to do */ 1538 if (blk_get_integrity(mddev->gendisk)) 1539 return 0; /* already registered */ 1540 list_for_each_entry(rdev, &mddev->disks, same_set) { 1541 /* skip spares and non-functional disks */ 1542 if (test_bit(Faulty, &rdev->flags)) 1543 continue; 1544 if (rdev->raid_disk < 0) 1545 continue; 1546 /* 1547 * If at least one rdev is not integrity capable, we can not 1548 * enable data integrity for the md device. 1549 */ 1550 if (!bdev_get_integrity(rdev->bdev)) 1551 return -EINVAL; 1552 if (!reference) { 1553 /* Use the first rdev as the reference */ 1554 reference = rdev; 1555 continue; 1556 } 1557 /* does this rdev's profile match the reference profile? */ 1558 if (blk_integrity_compare(reference->bdev->bd_disk, 1559 rdev->bdev->bd_disk) < 0) 1560 return -EINVAL; 1561 } 1562 /* 1563 * All component devices are integrity capable and have matching 1564 * profiles, register the common profile for the md device. 1565 */ 1566 if (blk_integrity_register(mddev->gendisk, 1567 bdev_get_integrity(reference->bdev)) != 0) { 1568 printk(KERN_ERR "md: failed to register integrity for %s\n", 1569 mdname(mddev)); 1570 return -EINVAL; 1571 } 1572 printk(KERN_NOTICE "md: data integrity on %s enabled\n", 1573 mdname(mddev)); 1574 return 0; 1575 } 1576 EXPORT_SYMBOL(md_integrity_register); 1577 1578 /* Disable data integrity if non-capable/non-matching disk is being added */ 1579 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) 1580 { 1581 struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); 1582 struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); 1583 1584 if (!bi_mddev) /* nothing to do */ 1585 return; 1586 if (rdev->raid_disk < 0) /* skip spares */ 1587 return; 1588 if (bi_rdev && blk_integrity_compare(mddev->gendisk, 1589 rdev->bdev->bd_disk) >= 0) 1590 return; 1591 printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); 1592 blk_integrity_unregister(mddev->gendisk); 1593 } 1594 EXPORT_SYMBOL(md_integrity_add_rdev); 1595 1596 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) 1597 { 1598 char b[BDEVNAME_SIZE]; 1599 struct kobject *ko; 1600 char *s; 1601 int err; 1602 1603 if (rdev->mddev) { 1604 MD_BUG(); 1605 return -EINVAL; 1606 } 1607 1608 /* prevent duplicates */ 1609 if (find_rdev(mddev, rdev->bdev->bd_dev)) 1610 return -EEXIST; 1611 1612 /* make sure rdev->sectors exceeds mddev->dev_sectors */ 1613 if (rdev->sectors && (mddev->dev_sectors == 0 || 1614 rdev->sectors < mddev->dev_sectors)) { 1615 if (mddev->pers) { 1616 /* Cannot change size, so fail 1617 * If mddev->level <= 0, then we don't care 1618 * about aligning sizes (e.g. linear) 1619 */ 1620 if (mddev->level > 0) 1621 return -ENOSPC; 1622 } else 1623 mddev->dev_sectors = rdev->sectors; 1624 } 1625 1626 /* Verify rdev->desc_nr is unique. 1627 * If it is -1, assign a free number, else 1628 * check number is not in use 1629 */ 1630 if (rdev->desc_nr < 0) { 1631 int choice = 0; 1632 if (mddev->pers) choice = mddev->raid_disks; 1633 while (find_rdev_nr(mddev, choice)) 1634 choice++; 1635 rdev->desc_nr = choice; 1636 } else { 1637 if (find_rdev_nr(mddev, rdev->desc_nr)) 1638 return -EBUSY; 1639 } 1640 if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { 1641 printk(KERN_WARNING "md: %s: array is limited to %d devices\n", 1642 mdname(mddev), mddev->max_disks); 1643 return -EBUSY; 1644 } 1645 bdevname(rdev->bdev,b); 1646 while ( (s=strchr(b, '/')) != NULL) 1647 *s = '!'; 1648 1649 rdev->mddev = mddev; 1650 printk(KERN_INFO "md: bind<%s>\n", b); 1651 1652 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) 1653 goto fail; 1654 1655 ko = &part_to_dev(rdev->bdev->bd_part)->kobj; 1656 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { 1657 kobject_del(&rdev->kobj); 1658 goto fail; 1659 } 1660 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); 1661 1662 list_add_rcu(&rdev->same_set, &mddev->disks); 1663 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); 1664 1665 /* May as well allow recovery to be retried once */ 1666 mddev->recovery_disabled = 0; 1667 1668 return 0; 1669 1670 fail: 1671 printk(KERN_WARNING "md: failed to register dev-%s for %s\n", 1672 b, mdname(mddev)); 1673 return err; 1674 } 1675 1676 static void md_delayed_delete(struct work_struct *ws) 1677 { 1678 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); 1679 kobject_del(&rdev->kobj); 1680 kobject_put(&rdev->kobj); 1681 } 1682 1683 static void unbind_rdev_from_array(mdk_rdev_t * rdev) 1684 { 1685 char b[BDEVNAME_SIZE]; 1686 if (!rdev->mddev) { 1687 MD_BUG(); 1688 return; 1689 } 1690 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); 1691 list_del_rcu(&rdev->same_set); 1692 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); 1693 rdev->mddev = NULL; 1694 sysfs_remove_link(&rdev->kobj, "block"); 1695 sysfs_put(rdev->sysfs_state); 1696 rdev->sysfs_state = NULL; 1697 /* We need to delay this, otherwise we can deadlock when 1698 * writing to 'remove' to "dev/state". We also need 1699 * to delay it due to rcu usage. 1700 */ 1701 synchronize_rcu(); 1702 INIT_WORK(&rdev->del_work, md_delayed_delete); 1703 kobject_get(&rdev->kobj); 1704 schedule_work(&rdev->del_work); 1705 } 1706 1707 /* 1708 * prevent the device from being mounted, repartitioned or 1709 * otherwise reused by a RAID array (or any other kernel 1710 * subsystem), by bd_claiming the device. 1711 */ 1712 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) 1713 { 1714 int err = 0; 1715 struct block_device *bdev; 1716 char b[BDEVNAME_SIZE]; 1717 1718 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 1719 if (IS_ERR(bdev)) { 1720 printk(KERN_ERR "md: could not open %s.\n", 1721 __bdevname(dev, b)); 1722 return PTR_ERR(bdev); 1723 } 1724 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); 1725 if (err) { 1726 printk(KERN_ERR "md: could not bd_claim %s.\n", 1727 bdevname(bdev, b)); 1728 blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 1729 return err; 1730 } 1731 if (!shared) 1732 set_bit(AllReserved, &rdev->flags); 1733 rdev->bdev = bdev; 1734 return err; 1735 } 1736 1737 static void unlock_rdev(mdk_rdev_t *rdev) 1738 { 1739 struct block_device *bdev = rdev->bdev; 1740 rdev->bdev = NULL; 1741 if (!bdev) 1742 MD_BUG(); 1743 bd_release(bdev); 1744 blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 1745 } 1746 1747 void md_autodetect_dev(dev_t dev); 1748 1749 static void export_rdev(mdk_rdev_t * rdev) 1750 { 1751 char b[BDEVNAME_SIZE]; 1752 printk(KERN_INFO "md: export_rdev(%s)\n", 1753 bdevname(rdev->bdev,b)); 1754 if (rdev->mddev) 1755 MD_BUG(); 1756 free_disk_sb(rdev); 1757 #ifndef MODULE 1758 if (test_bit(AutoDetected, &rdev->flags)) 1759 md_autodetect_dev(rdev->bdev->bd_dev); 1760 #endif 1761 unlock_rdev(rdev); 1762 kobject_put(&rdev->kobj); 1763 } 1764 1765 static void kick_rdev_from_array(mdk_rdev_t * rdev) 1766 { 1767 unbind_rdev_from_array(rdev); 1768 export_rdev(rdev); 1769 } 1770 1771 static void export_array(mddev_t *mddev) 1772 { 1773 mdk_rdev_t *rdev, *tmp; 1774 1775 rdev_for_each(rdev, tmp, mddev) { 1776 if (!rdev->mddev) { 1777 MD_BUG(); 1778 continue; 1779 } 1780 kick_rdev_from_array(rdev); 1781 } 1782 if (!list_empty(&mddev->disks)) 1783 MD_BUG(); 1784 mddev->raid_disks = 0; 1785 mddev->major_version = 0; 1786 } 1787 1788 static void print_desc(mdp_disk_t *desc) 1789 { 1790 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, 1791 desc->major,desc->minor,desc->raid_disk,desc->state); 1792 } 1793 1794 static void print_sb_90(mdp_super_t *sb) 1795 { 1796 int i; 1797 1798 printk(KERN_INFO 1799 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", 1800 sb->major_version, sb->minor_version, sb->patch_version, 1801 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, 1802 sb->ctime); 1803 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", 1804 sb->level, sb->size, sb->nr_disks, sb->raid_disks, 1805 sb->md_minor, sb->layout, sb->chunk_size); 1806 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" 1807 " FD:%d SD:%d CSUM:%08x E:%08lx\n", 1808 sb->utime, sb->state, sb->active_disks, sb->working_disks, 1809 sb->failed_disks, sb->spare_disks, 1810 sb->sb_csum, (unsigned long)sb->events_lo); 1811 1812 printk(KERN_INFO); 1813 for (i = 0; i < MD_SB_DISKS; i++) { 1814 mdp_disk_t *desc; 1815 1816 desc = sb->disks + i; 1817 if (desc->number || desc->major || desc->minor || 1818 desc->raid_disk || (desc->state && (desc->state != 4))) { 1819 printk(" D %2d: ", i); 1820 print_desc(desc); 1821 } 1822 } 1823 printk(KERN_INFO "md: THIS: "); 1824 print_desc(&sb->this_disk); 1825 } 1826 1827 static void print_sb_1(struct mdp_superblock_1 *sb) 1828 { 1829 __u8 *uuid; 1830 1831 uuid = sb->set_uuid; 1832 printk(KERN_INFO 1833 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" 1834 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" 1835 "md: Name: \"%s\" CT:%llu\n", 1836 le32_to_cpu(sb->major_version), 1837 le32_to_cpu(sb->feature_map), 1838 uuid[0], uuid[1], uuid[2], uuid[3], 1839 uuid[4], uuid[5], uuid[6], uuid[7], 1840 uuid[8], uuid[9], uuid[10], uuid[11], 1841 uuid[12], uuid[13], uuid[14], uuid[15], 1842 sb->set_name, 1843 (unsigned long long)le64_to_cpu(sb->ctime) 1844 & MD_SUPERBLOCK_1_TIME_SEC_MASK); 1845 1846 uuid = sb->device_uuid; 1847 printk(KERN_INFO 1848 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" 1849 " RO:%llu\n" 1850 "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" 1851 ":%02x%02x%02x%02x%02x%02x\n" 1852 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" 1853 "md: (MaxDev:%u) \n", 1854 le32_to_cpu(sb->level), 1855 (unsigned long long)le64_to_cpu(sb->size), 1856 le32_to_cpu(sb->raid_disks), 1857 le32_to_cpu(sb->layout), 1858 le32_to_cpu(sb->chunksize), 1859 (unsigned long long)le64_to_cpu(sb->data_offset), 1860 (unsigned long long)le64_to_cpu(sb->data_size), 1861 (unsigned long long)le64_to_cpu(sb->super_offset), 1862 (unsigned long long)le64_to_cpu(sb->recovery_offset), 1863 le32_to_cpu(sb->dev_number), 1864 uuid[0], uuid[1], uuid[2], uuid[3], 1865 uuid[4], uuid[5], uuid[6], uuid[7], 1866 uuid[8], uuid[9], uuid[10], uuid[11], 1867 uuid[12], uuid[13], uuid[14], uuid[15], 1868 sb->devflags, 1869 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, 1870 (unsigned long long)le64_to_cpu(sb->events), 1871 (unsigned long long)le64_to_cpu(sb->resync_offset), 1872 le32_to_cpu(sb->sb_csum), 1873 le32_to_cpu(sb->max_dev) 1874 ); 1875 } 1876 1877 static void print_rdev(mdk_rdev_t *rdev, int major_version) 1878 { 1879 char b[BDEVNAME_SIZE]; 1880 printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", 1881 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, 1882 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), 1883 rdev->desc_nr); 1884 if (rdev->sb_loaded) { 1885 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); 1886 switch (major_version) { 1887 case 0: 1888 print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); 1889 break; 1890 case 1: 1891 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); 1892 break; 1893 } 1894 } else 1895 printk(KERN_INFO "md: no rdev superblock!\n"); 1896 } 1897 1898 static void md_print_devices(void) 1899 { 1900 struct list_head *tmp; 1901 mdk_rdev_t *rdev; 1902 mddev_t *mddev; 1903 char b[BDEVNAME_SIZE]; 1904 1905 printk("\n"); 1906 printk("md: **********************************\n"); 1907 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); 1908 printk("md: **********************************\n"); 1909 for_each_mddev(mddev, tmp) { 1910 1911 if (mddev->bitmap) 1912 bitmap_print_sb(mddev->bitmap); 1913 else 1914 printk("%s: ", mdname(mddev)); 1915 list_for_each_entry(rdev, &mddev->disks, same_set) 1916 printk("<%s>", bdevname(rdev->bdev,b)); 1917 printk("\n"); 1918 1919 list_for_each_entry(rdev, &mddev->disks, same_set) 1920 print_rdev(rdev, mddev->major_version); 1921 } 1922 printk("md: **********************************\n"); 1923 printk("\n"); 1924 } 1925 1926 1927 static void sync_sbs(mddev_t * mddev, int nospares) 1928 { 1929 /* Update each superblock (in-memory image), but 1930 * if we are allowed to, skip spares which already 1931 * have the right event counter, or have one earlier 1932 * (which would mean they aren't being marked as dirty 1933 * with the rest of the array) 1934 */ 1935 mdk_rdev_t *rdev; 1936 1937 /* First make sure individual recovery_offsets are correct */ 1938 list_for_each_entry(rdev, &mddev->disks, same_set) { 1939 if (rdev->raid_disk >= 0 && 1940 !test_bit(In_sync, &rdev->flags) && 1941 mddev->curr_resync_completed > rdev->recovery_offset) 1942 rdev->recovery_offset = mddev->curr_resync_completed; 1943 1944 } 1945 list_for_each_entry(rdev, &mddev->disks, same_set) { 1946 if (rdev->sb_events == mddev->events || 1947 (nospares && 1948 rdev->raid_disk < 0 && 1949 (rdev->sb_events&1)==0 && 1950 rdev->sb_events+1 == mddev->events)) { 1951 /* Don't update this superblock */ 1952 rdev->sb_loaded = 2; 1953 } else { 1954 super_types[mddev->major_version]. 1955 sync_super(mddev, rdev); 1956 rdev->sb_loaded = 1; 1957 } 1958 } 1959 } 1960 1961 static void md_update_sb(mddev_t * mddev, int force_change) 1962 { 1963 mdk_rdev_t *rdev; 1964 int sync_req; 1965 int nospares = 0; 1966 1967 mddev->utime = get_seconds(); 1968 if (mddev->external) 1969 return; 1970 repeat: 1971 spin_lock_irq(&mddev->write_lock); 1972 1973 set_bit(MD_CHANGE_PENDING, &mddev->flags); 1974 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) 1975 force_change = 1; 1976 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) 1977 /* just a clean<-> dirty transition, possibly leave spares alone, 1978 * though if events isn't the right even/odd, we will have to do 1979 * spares after all 1980 */ 1981 nospares = 1; 1982 if (force_change) 1983 nospares = 0; 1984 if (mddev->degraded) 1985 /* If the array is degraded, then skipping spares is both 1986 * dangerous and fairly pointless. 1987 * Dangerous because a device that was removed from the array 1988 * might have a event_count that still looks up-to-date, 1989 * so it can be re-added without a resync. 1990 * Pointless because if there are any spares to skip, 1991 * then a recovery will happen and soon that array won't 1992 * be degraded any more and the spare can go back to sleep then. 1993 */ 1994 nospares = 0; 1995 1996 sync_req = mddev->in_sync; 1997 1998 /* If this is just a dirty<->clean transition, and the array is clean 1999 * and 'events' is odd, we can roll back to the previous clean state */ 2000 if (nospares 2001 && (mddev->in_sync && mddev->recovery_cp == MaxSector) 2002 && (mddev->events & 1) 2003 && mddev->events != 1) 2004 mddev->events--; 2005 else { 2006 /* otherwise we have to go forward and ... */ 2007 mddev->events ++; 2008 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ 2009 /* .. if the array isn't clean, an 'even' event must also go 2010 * to spares. */ 2011 if ((mddev->events&1)==0) 2012 nospares = 0; 2013 } else { 2014 /* otherwise an 'odd' event must go to spares */ 2015 if ((mddev->events&1)) 2016 nospares = 0; 2017 } 2018 } 2019 2020 if (!mddev->events) { 2021 /* 2022 * oops, this 64-bit counter should never wrap. 2023 * Either we are in around ~1 trillion A.C., assuming 2024 * 1 reboot per second, or we have a bug: 2025 */ 2026 MD_BUG(); 2027 mddev->events --; 2028 } 2029 2030 /* 2031 * do not write anything to disk if using 2032 * nonpersistent superblocks 2033 */ 2034 if (!mddev->persistent) { 2035 if (!mddev->external) 2036 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2037 2038 spin_unlock_irq(&mddev->write_lock); 2039 wake_up(&mddev->sb_wait); 2040 return; 2041 } 2042 sync_sbs(mddev, nospares); 2043 spin_unlock_irq(&mddev->write_lock); 2044 2045 dprintk(KERN_INFO 2046 "md: updating %s RAID superblock on device (in sync %d)\n", 2047 mdname(mddev),mddev->in_sync); 2048 2049 bitmap_update_sb(mddev->bitmap); 2050 list_for_each_entry(rdev, &mddev->disks, same_set) { 2051 char b[BDEVNAME_SIZE]; 2052 dprintk(KERN_INFO "md: "); 2053 if (rdev->sb_loaded != 1) 2054 continue; /* no noise on spare devices */ 2055 if (test_bit(Faulty, &rdev->flags)) 2056 dprintk("(skipping faulty "); 2057 2058 dprintk("%s ", bdevname(rdev->bdev,b)); 2059 if (!test_bit(Faulty, &rdev->flags)) { 2060 md_super_write(mddev,rdev, 2061 rdev->sb_start, rdev->sb_size, 2062 rdev->sb_page); 2063 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", 2064 bdevname(rdev->bdev,b), 2065 (unsigned long long)rdev->sb_start); 2066 rdev->sb_events = mddev->events; 2067 2068 } else 2069 dprintk(")\n"); 2070 if (mddev->level == LEVEL_MULTIPATH) 2071 /* only need to write one superblock... */ 2072 break; 2073 } 2074 md_super_wait(mddev); 2075 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ 2076 2077 spin_lock_irq(&mddev->write_lock); 2078 if (mddev->in_sync != sync_req || 2079 test_bit(MD_CHANGE_DEVS, &mddev->flags)) { 2080 /* have to write it out again */ 2081 spin_unlock_irq(&mddev->write_lock); 2082 goto repeat; 2083 } 2084 clear_bit(MD_CHANGE_PENDING, &mddev->flags); 2085 spin_unlock_irq(&mddev->write_lock); 2086 wake_up(&mddev->sb_wait); 2087 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 2088 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 2089 2090 } 2091 2092 /* words written to sysfs files may, or may not, be \n terminated. 2093 * We want to accept with case. For this we use cmd_match. 2094 */ 2095 static int cmd_match(const char *cmd, const char *str) 2096 { 2097 /* See if cmd, written into a sysfs file, matches 2098 * str. They must either be the same, or cmd can 2099 * have a trailing newline 2100 */ 2101 while (*cmd && *str && *cmd == *str) { 2102 cmd++; 2103 str++; 2104 } 2105 if (*cmd == '\n') 2106 cmd++; 2107 if (*str || *cmd) 2108 return 0; 2109 return 1; 2110 } 2111 2112 struct rdev_sysfs_entry { 2113 struct attribute attr; 2114 ssize_t (*show)(mdk_rdev_t *, char *); 2115 ssize_t (*store)(mdk_rdev_t *, const char *, size_t); 2116 }; 2117 2118 static ssize_t 2119 state_show(mdk_rdev_t *rdev, char *page) 2120 { 2121 char *sep = ""; 2122 size_t len = 0; 2123 2124 if (test_bit(Faulty, &rdev->flags)) { 2125 len+= sprintf(page+len, "%sfaulty",sep); 2126 sep = ","; 2127 } 2128 if (test_bit(In_sync, &rdev->flags)) { 2129 len += sprintf(page+len, "%sin_sync",sep); 2130 sep = ","; 2131 } 2132 if (test_bit(WriteMostly, &rdev->flags)) { 2133 len += sprintf(page+len, "%swrite_mostly",sep); 2134 sep = ","; 2135 } 2136 if (test_bit(Blocked, &rdev->flags)) { 2137 len += sprintf(page+len, "%sblocked", sep); 2138 sep = ","; 2139 } 2140 if (!test_bit(Faulty, &rdev->flags) && 2141 !test_bit(In_sync, &rdev->flags)) { 2142 len += sprintf(page+len, "%sspare", sep); 2143 sep = ","; 2144 } 2145 return len+sprintf(page+len, "\n"); 2146 } 2147 2148 static ssize_t 2149 state_store(mdk_rdev_t *rdev, const char *buf, size_t len) 2150 { 2151 /* can write 2152 * faulty - simulates and error 2153 * remove - disconnects the device 2154 * writemostly - sets write_mostly 2155 * -writemostly - clears write_mostly 2156 * blocked - sets the Blocked flag 2157 * -blocked - clears the Blocked flag 2158 * insync - sets Insync providing device isn't active 2159 */ 2160 int err = -EINVAL; 2161 if (cmd_match(buf, "faulty") && rdev->mddev->pers) { 2162 md_error(rdev->mddev, rdev); 2163 err = 0; 2164 } else if (cmd_match(buf, "remove")) { 2165 if (rdev->raid_disk >= 0) 2166 err = -EBUSY; 2167 else { 2168 mddev_t *mddev = rdev->mddev; 2169 kick_rdev_from_array(rdev); 2170 if (mddev->pers) 2171 md_update_sb(mddev, 1); 2172 md_new_event(mddev); 2173 err = 0; 2174 } 2175 } else if (cmd_match(buf, "writemostly")) { 2176 set_bit(WriteMostly, &rdev->flags); 2177 err = 0; 2178 } else if (cmd_match(buf, "-writemostly")) { 2179 clear_bit(WriteMostly, &rdev->flags); 2180 err = 0; 2181 } else if (cmd_match(buf, "blocked")) { 2182 set_bit(Blocked, &rdev->flags); 2183 err = 0; 2184 } else if (cmd_match(buf, "-blocked")) { 2185 clear_bit(Blocked, &rdev->flags); 2186 wake_up(&rdev->blocked_wait); 2187 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2188 md_wakeup_thread(rdev->mddev->thread); 2189 2190 err = 0; 2191 } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { 2192 set_bit(In_sync, &rdev->flags); 2193 err = 0; 2194 } 2195 if (!err && rdev->sysfs_state) 2196 sysfs_notify_dirent(rdev->sysfs_state); 2197 return err ? err : len; 2198 } 2199 static struct rdev_sysfs_entry rdev_state = 2200 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); 2201 2202 static ssize_t 2203 errors_show(mdk_rdev_t *rdev, char *page) 2204 { 2205 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); 2206 } 2207 2208 static ssize_t 2209 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) 2210 { 2211 char *e; 2212 unsigned long n = simple_strtoul(buf, &e, 10); 2213 if (*buf && (*e == 0 || *e == '\n')) { 2214 atomic_set(&rdev->corrected_errors, n); 2215 return len; 2216 } 2217 return -EINVAL; 2218 } 2219 static struct rdev_sysfs_entry rdev_errors = 2220 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); 2221 2222 static ssize_t 2223 slot_show(mdk_rdev_t *rdev, char *page) 2224 { 2225 if (rdev->raid_disk < 0) 2226 return sprintf(page, "none\n"); 2227 else 2228 return sprintf(page, "%d\n", rdev->raid_disk); 2229 } 2230 2231 static ssize_t 2232 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) 2233 { 2234 char *e; 2235 int err; 2236 char nm[20]; 2237 int slot = simple_strtoul(buf, &e, 10); 2238 if (strncmp(buf, "none", 4)==0) 2239 slot = -1; 2240 else if (e==buf || (*e && *e!= '\n')) 2241 return -EINVAL; 2242 if (rdev->mddev->pers && slot == -1) { 2243 /* Setting 'slot' on an active array requires also 2244 * updating the 'rd%d' link, and communicating 2245 * with the personality with ->hot_*_disk. 2246 * For now we only support removing 2247 * failed/spare devices. This normally happens automatically, 2248 * but not when the metadata is externally managed. 2249 */ 2250 if (rdev->raid_disk == -1) 2251 return -EEXIST; 2252 /* personality does all needed checks */ 2253 if (rdev->mddev->pers->hot_add_disk == NULL) 2254 return -EINVAL; 2255 err = rdev->mddev->pers-> 2256 hot_remove_disk(rdev->mddev, rdev->raid_disk); 2257 if (err) 2258 return err; 2259 sprintf(nm, "rd%d", rdev->raid_disk); 2260 sysfs_remove_link(&rdev->mddev->kobj, nm); 2261 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); 2262 md_wakeup_thread(rdev->mddev->thread); 2263 } else if (rdev->mddev->pers) { 2264 mdk_rdev_t *rdev2; 2265 /* Activating a spare .. or possibly reactivating 2266 * if we ever get bitmaps working here. 2267 */ 2268 2269 if (rdev->raid_disk != -1) 2270 return -EBUSY; 2271 2272 if (rdev->mddev->pers->hot_add_disk == NULL) 2273 return -EINVAL; 2274 2275 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) 2276 if (rdev2->raid_disk == slot) 2277 return -EEXIST; 2278 2279 rdev->raid_disk = slot; 2280 if (test_bit(In_sync, &rdev->flags)) 2281 rdev->saved_raid_disk = slot; 2282 else 2283 rdev->saved_raid_disk = -1; 2284 err = rdev->mddev->pers-> 2285 hot_add_disk(rdev->mddev, rdev); 2286 if (err) { 2287 rdev->raid_disk = -1; 2288 return err; 2289 } else 2290 sysfs_notify_dirent(rdev->sysfs_state); 2291 sprintf(nm, "rd%d", rdev->raid_disk); 2292 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) 2293 printk(KERN_WARNING 2294 "md: cannot register " 2295 "%s for %s\n", 2296 nm, mdname(rdev->mddev)); 2297 2298 /* don't wakeup anyone, leave that to userspace. */ 2299 } else { 2300 if (slot >= rdev->mddev->raid_disks) 2301 return -ENOSPC; 2302 rdev->raid_disk = slot; 2303 /* assume it is working */ 2304 clear_bit(Faulty, &rdev->flags); 2305 clear_bit(WriteMostly, &rdev->flags); 2306 set_bit(In_sync, &rdev->flags); 2307 sysfs_notify_dirent(rdev->sysfs_state); 2308 } 2309 return len; 2310 } 2311 2312 2313 static struct rdev_sysfs_entry rdev_slot = 2314 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); 2315 2316 static ssize_t 2317 offset_show(mdk_rdev_t *rdev, char *page) 2318 { 2319 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); 2320 } 2321 2322 static ssize_t 2323 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) 2324 { 2325 char *e; 2326 unsigned long long offset = simple_strtoull(buf, &e, 10); 2327 if (e==buf || (*e && *e != '\n')) 2328 return -EINVAL; 2329 if (rdev->mddev->pers && rdev->raid_disk >= 0) 2330 return -EBUSY; 2331 if (rdev->sectors && rdev->mddev->external) 2332 /* Must set offset before size, so overlap checks 2333 * can be sane */ 2334 return -EBUSY; 2335 rdev->data_offset = offset; 2336 return len; 2337 } 2338 2339 static struct rdev_sysfs_entry rdev_offset = 2340 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); 2341 2342 static ssize_t 2343 rdev_size_show(mdk_rdev_t *rdev, char *page) 2344 { 2345 return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); 2346 } 2347 2348 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) 2349 { 2350 /* check if two start/length pairs overlap */ 2351 if (s1+l1 <= s2) 2352 return 0; 2353 if (s2+l2 <= s1) 2354 return 0; 2355 return 1; 2356 } 2357 2358 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) 2359 { 2360 unsigned long long blocks; 2361 sector_t new; 2362 2363 if (strict_strtoull(buf, 10, &blocks) < 0) 2364 return -EINVAL; 2365 2366 if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) 2367 return -EINVAL; /* sector conversion overflow */ 2368 2369 new = blocks * 2; 2370 if (new != blocks * 2) 2371 return -EINVAL; /* unsigned long long to sector_t overflow */ 2372 2373 *sectors = new; 2374 return 0; 2375 } 2376 2377 static ssize_t 2378 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) 2379 { 2380 mddev_t *my_mddev = rdev->mddev; 2381 sector_t oldsectors = rdev->sectors; 2382 sector_t sectors; 2383 2384 if (strict_blocks_to_sectors(buf, §ors) < 0) 2385 return -EINVAL; 2386 if (my_mddev->pers && rdev->raid_disk >= 0) { 2387 if (my_mddev->persistent) { 2388 sectors = super_types[my_mddev->major_version]. 2389 rdev_size_change(rdev, sectors); 2390 if (!sectors) 2391 return -EBUSY; 2392 } else if (!sectors) 2393 sectors = (rdev->bdev->bd_inode->i_size >> 9) - 2394 rdev->data_offset; 2395 } 2396 if (sectors < my_mddev->dev_sectors) 2397 return -EINVAL; /* component must fit device */ 2398 2399 rdev->sectors = sectors; 2400 if (sectors > oldsectors && my_mddev->external) { 2401 /* need to check that all other rdevs with the same ->bdev 2402 * do not overlap. We need to unlock the mddev to avoid 2403 * a deadlock. We have already changed rdev->sectors, and if 2404 * we have to change it back, we will have the lock again. 2405 */ 2406 mddev_t *mddev; 2407 int overlap = 0; 2408 struct list_head *tmp; 2409 2410 mddev_unlock(my_mddev); 2411 for_each_mddev(mddev, tmp) { 2412 mdk_rdev_t *rdev2; 2413 2414 mddev_lock(mddev); 2415 list_for_each_entry(rdev2, &mddev->disks, same_set) 2416 if (test_bit(AllReserved, &rdev2->flags) || 2417 (rdev->bdev == rdev2->bdev && 2418 rdev != rdev2 && 2419 overlaps(rdev->data_offset, rdev->sectors, 2420 rdev2->data_offset, 2421 rdev2->sectors))) { 2422 overlap = 1; 2423 break; 2424 } 2425 mddev_unlock(mddev); 2426 if (overlap) { 2427 mddev_put(mddev); 2428 break; 2429 } 2430 } 2431 mddev_lock(my_mddev); 2432 if (overlap) { 2433 /* Someone else could have slipped in a size 2434 * change here, but doing so is just silly. 2435 * We put oldsectors back because we *know* it is 2436 * safe, and trust userspace not to race with 2437 * itself 2438 */ 2439 rdev->sectors = oldsectors; 2440 return -EBUSY; 2441 } 2442 } 2443 return len; 2444 } 2445 2446 static struct rdev_sysfs_entry rdev_size = 2447 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); 2448 2449 static struct attribute *rdev_default_attrs[] = { 2450 &rdev_state.attr, 2451 &rdev_errors.attr, 2452 &rdev_slot.attr, 2453 &rdev_offset.attr, 2454 &rdev_size.attr, 2455 NULL, 2456 }; 2457 static ssize_t 2458 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 2459 { 2460 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 2461 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 2462 mddev_t *mddev = rdev->mddev; 2463 ssize_t rv; 2464 2465 if (!entry->show) 2466 return -EIO; 2467 2468 rv = mddev ? mddev_lock(mddev) : -EBUSY; 2469 if (!rv) { 2470 if (rdev->mddev == NULL) 2471 rv = -EBUSY; 2472 else 2473 rv = entry->show(rdev, page); 2474 mddev_unlock(mddev); 2475 } 2476 return rv; 2477 } 2478 2479 static ssize_t 2480 rdev_attr_store(struct kobject *kobj, struct attribute *attr, 2481 const char *page, size_t length) 2482 { 2483 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); 2484 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); 2485 ssize_t rv; 2486 mddev_t *mddev = rdev->mddev; 2487 2488 if (!entry->store) 2489 return -EIO; 2490 if (!capable(CAP_SYS_ADMIN)) 2491 return -EACCES; 2492 rv = mddev ? mddev_lock(mddev): -EBUSY; 2493 if (!rv) { 2494 if (rdev->mddev == NULL) 2495 rv = -EBUSY; 2496 else 2497 rv = entry->store(rdev, page, length); 2498 mddev_unlock(mddev); 2499 } 2500 return rv; 2501 } 2502 2503 static void rdev_free(struct kobject *ko) 2504 { 2505 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); 2506 kfree(rdev); 2507 } 2508 static struct sysfs_ops rdev_sysfs_ops = { 2509 .show = rdev_attr_show, 2510 .store = rdev_attr_store, 2511 }; 2512 static struct kobj_type rdev_ktype = { 2513 .release = rdev_free, 2514 .sysfs_ops = &rdev_sysfs_ops, 2515 .default_attrs = rdev_default_attrs, 2516 }; 2517 2518 /* 2519 * Import a device. If 'super_format' >= 0, then sanity check the superblock 2520 * 2521 * mark the device faulty if: 2522 * 2523 * - the device is nonexistent (zero size) 2524 * - the device has no valid superblock 2525 * 2526 * a faulty rdev _never_ has rdev->sb set. 2527 */ 2528 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) 2529 { 2530 char b[BDEVNAME_SIZE]; 2531 int err; 2532 mdk_rdev_t *rdev; 2533 sector_t size; 2534 2535 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); 2536 if (!rdev) { 2537 printk(KERN_ERR "md: could not alloc mem for new device!\n"); 2538 return ERR_PTR(-ENOMEM); 2539 } 2540 2541 if ((err = alloc_disk_sb(rdev))) 2542 goto abort_free; 2543 2544 err = lock_rdev(rdev, newdev, super_format == -2); 2545 if (err) 2546 goto abort_free; 2547 2548 kobject_init(&rdev->kobj, &rdev_ktype); 2549 2550 rdev->desc_nr = -1; 2551 rdev->saved_raid_disk = -1; 2552 rdev->raid_disk = -1; 2553 rdev->flags = 0; 2554 rdev->data_offset = 0; 2555 rdev->sb_events = 0; 2556 atomic_set(&rdev->nr_pending, 0); 2557 atomic_set(&rdev->read_errors, 0); 2558 atomic_set(&rdev->corrected_errors, 0); 2559 2560 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; 2561 if (!size) { 2562 printk(KERN_WARNING 2563 "md: %s has zero or unknown size, marking faulty!\n", 2564 bdevname(rdev->bdev,b)); 2565 err = -EINVAL; 2566 goto abort_free; 2567 } 2568 2569 if (super_format >= 0) { 2570 err = super_types[super_format]. 2571 load_super(rdev, NULL, super_minor); 2572 if (err == -EINVAL) { 2573 printk(KERN_WARNING 2574 "md: %s does not have a valid v%d.%d " 2575 "superblock, not importing!\n", 2576 bdevname(rdev->bdev,b), 2577 super_format, super_minor); 2578 goto abort_free; 2579 } 2580 if (err < 0) { 2581 printk(KERN_WARNING 2582 "md: could not read %s's sb, not importing!\n", 2583 bdevname(rdev->bdev,b)); 2584 goto abort_free; 2585 } 2586 } 2587 2588 INIT_LIST_HEAD(&rdev->same_set); 2589 init_waitqueue_head(&rdev->blocked_wait); 2590 2591 return rdev; 2592 2593 abort_free: 2594 if (rdev->sb_page) { 2595 if (rdev->bdev) 2596 unlock_rdev(rdev); 2597 free_disk_sb(rdev); 2598 } 2599 kfree(rdev); 2600 return ERR_PTR(err); 2601 } 2602 2603 /* 2604 * Check a full RAID array for plausibility 2605 */ 2606 2607 2608 static void analyze_sbs(mddev_t * mddev) 2609 { 2610 int i; 2611 mdk_rdev_t *rdev, *freshest, *tmp; 2612 char b[BDEVNAME_SIZE]; 2613 2614 freshest = NULL; 2615 rdev_for_each(rdev, tmp, mddev) 2616 switch (super_types[mddev->major_version]. 2617 load_super(rdev, freshest, mddev->minor_version)) { 2618 case 1: 2619 freshest = rdev; 2620 break; 2621 case 0: 2622 break; 2623 default: 2624 printk( KERN_ERR \ 2625 "md: fatal superblock inconsistency in %s" 2626 " -- removing from array\n", 2627 bdevname(rdev->bdev,b)); 2628 kick_rdev_from_array(rdev); 2629 } 2630 2631 2632 super_types[mddev->major_version]. 2633 validate_super(mddev, freshest); 2634 2635 i = 0; 2636 rdev_for_each(rdev, tmp, mddev) { 2637 if (rdev->desc_nr >= mddev->max_disks || 2638 i > mddev->max_disks) { 2639 printk(KERN_WARNING 2640 "md: %s: %s: only %d devices permitted\n", 2641 mdname(mddev), bdevname(rdev->bdev, b), 2642 mddev->max_disks); 2643 kick_rdev_from_array(rdev); 2644 continue; 2645 } 2646 if (rdev != freshest) 2647 if (super_types[mddev->major_version]. 2648 validate_super(mddev, rdev)) { 2649 printk(KERN_WARNING "md: kicking non-fresh %s" 2650 " from array!\n", 2651 bdevname(rdev->bdev,b)); 2652 kick_rdev_from_array(rdev); 2653 continue; 2654 } 2655 if (mddev->level == LEVEL_MULTIPATH) { 2656 rdev->desc_nr = i++; 2657 rdev->raid_disk = rdev->desc_nr; 2658 set_bit(In_sync, &rdev->flags); 2659 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { 2660 rdev->raid_disk = -1; 2661 clear_bit(In_sync, &rdev->flags); 2662 } 2663 } 2664 } 2665 2666 static void md_safemode_timeout(unsigned long data); 2667 2668 static ssize_t 2669 safe_delay_show(mddev_t *mddev, char *page) 2670 { 2671 int msec = (mddev->safemode_delay*1000)/HZ; 2672 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); 2673 } 2674 static ssize_t 2675 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) 2676 { 2677 int scale=1; 2678 int dot=0; 2679 int i; 2680 unsigned long msec; 2681 char buf[30]; 2682 2683 /* remove a period, and count digits after it */ 2684 if (len >= sizeof(buf)) 2685 return -EINVAL; 2686 strlcpy(buf, cbuf, sizeof(buf)); 2687 for (i=0; i<len; i++) { 2688 if (dot) { 2689 if (isdigit(buf[i])) { 2690 buf[i-1] = buf[i]; 2691 scale *= 10; 2692 } 2693 buf[i] = 0; 2694 } else if (buf[i] == '.') { 2695 dot=1; 2696 buf[i] = 0; 2697 } 2698 } 2699 if (strict_strtoul(buf, 10, &msec) < 0) 2700 return -EINVAL; 2701 msec = (msec * 1000) / scale; 2702 if (msec == 0) 2703 mddev->safemode_delay = 0; 2704 else { 2705 unsigned long old_delay = mddev->safemode_delay; 2706 mddev->safemode_delay = (msec*HZ)/1000; 2707 if (mddev->safemode_delay == 0) 2708 mddev->safemode_delay = 1; 2709 if (mddev->safemode_delay < old_delay) 2710 md_safemode_timeout((unsigned long)mddev); 2711 } 2712 return len; 2713 } 2714 static struct md_sysfs_entry md_safe_delay = 2715 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); 2716 2717 static ssize_t 2718 level_show(mddev_t *mddev, char *page) 2719 { 2720 struct mdk_personality *p = mddev->pers; 2721 if (p) 2722 return sprintf(page, "%s\n", p->name); 2723 else if (mddev->clevel[0]) 2724 return sprintf(page, "%s\n", mddev->clevel); 2725 else if (mddev->level != LEVEL_NONE) 2726 return sprintf(page, "%d\n", mddev->level); 2727 else 2728 return 0; 2729 } 2730 2731 static ssize_t 2732 level_store(mddev_t *mddev, const char *buf, size_t len) 2733 { 2734 char level[16]; 2735 ssize_t rv = len; 2736 struct mdk_personality *pers; 2737 void *priv; 2738 mdk_rdev_t *rdev; 2739 2740 if (mddev->pers == NULL) { 2741 if (len == 0) 2742 return 0; 2743 if (len >= sizeof(mddev->clevel)) 2744 return -ENOSPC; 2745 strncpy(mddev->clevel, buf, len); 2746 if (mddev->clevel[len-1] == '\n') 2747 len--; 2748 mddev->clevel[len] = 0; 2749 mddev->level = LEVEL_NONE; 2750 return rv; 2751 } 2752 2753 /* request to change the personality. Need to ensure: 2754 * - array is not engaged in resync/recovery/reshape 2755 * - old personality can be suspended 2756 * - new personality will access other array. 2757 */ 2758 2759 if (mddev->sync_thread || mddev->reshape_position != MaxSector) 2760 return -EBUSY; 2761 2762 if (!mddev->pers->quiesce) { 2763 printk(KERN_WARNING "md: %s: %s does not support online personality change\n", 2764 mdname(mddev), mddev->pers->name); 2765 return -EINVAL; 2766 } 2767 2768 /* Now find the new personality */ 2769 if (len == 0 || len >= sizeof(level)) 2770 return -EINVAL; 2771 strncpy(level, buf, len); 2772 if (level[len-1] == '\n') 2773 len--; 2774 level[len] = 0; 2775 2776 request_module("md-%s", level); 2777 spin_lock(&pers_lock); 2778 pers = find_pers(LEVEL_NONE, level); 2779 if (!pers || !try_module_get(pers->owner)) { 2780 spin_unlock(&pers_lock); 2781 printk(KERN_WARNING "md: personality %s not loaded\n", level); 2782 return -EINVAL; 2783 } 2784 spin_unlock(&pers_lock); 2785 2786 if (pers == mddev->pers) { 2787 /* Nothing to do! */ 2788 module_put(pers->owner); 2789 return rv; 2790 } 2791 if (!pers->takeover) { 2792 module_put(pers->owner); 2793 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", 2794 mdname(mddev), level); 2795 return -EINVAL; 2796 } 2797 2798 /* ->takeover must set new_* and/or delta_disks 2799 * if it succeeds, and may set them when it fails. 2800 */ 2801 priv = pers->takeover(mddev); 2802 if (IS_ERR(priv)) { 2803 mddev->new_level = mddev->level; 2804 mddev->new_layout = mddev->layout; 2805 mddev->new_chunk_sectors = mddev->chunk_sectors; 2806 mddev->raid_disks -= mddev->delta_disks; 2807 mddev->delta_disks = 0; 2808 module_put(pers->owner); 2809 printk(KERN_WARNING "md: %s: %s would not accept array\n", 2810 mdname(mddev), level); 2811 return PTR_ERR(priv); 2812 } 2813 2814 /* Looks like we have a winner */ 2815 mddev_suspend(mddev); 2816 mddev->pers->stop(mddev); 2817 module_put(mddev->pers->owner); 2818 /* Invalidate devices that are now superfluous */ 2819 list_for_each_entry(rdev, &mddev->disks, same_set) 2820 if (rdev->raid_disk >= mddev->raid_disks) { 2821 rdev->raid_disk = -1; 2822 clear_bit(In_sync, &rdev->flags); 2823 } 2824 mddev->pers = pers; 2825 mddev->private = priv; 2826 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 2827 mddev->level = mddev->new_level; 2828 mddev->layout = mddev->new_layout; 2829 mddev->chunk_sectors = mddev->new_chunk_sectors; 2830 mddev->delta_disks = 0; 2831 pers->run(mddev); 2832 mddev_resume(mddev); 2833 set_bit(MD_CHANGE_DEVS, &mddev->flags); 2834 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 2835 md_wakeup_thread(mddev->thread); 2836 return rv; 2837 } 2838 2839 static struct md_sysfs_entry md_level = 2840 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); 2841 2842 2843 static ssize_t 2844 layout_show(mddev_t *mddev, char *page) 2845 { 2846 /* just a number, not meaningful for all levels */ 2847 if (mddev->reshape_position != MaxSector && 2848 mddev->layout != mddev->new_layout) 2849 return sprintf(page, "%d (%d)\n", 2850 mddev->new_layout, mddev->layout); 2851 return sprintf(page, "%d\n", mddev->layout); 2852 } 2853 2854 static ssize_t 2855 layout_store(mddev_t *mddev, const char *buf, size_t len) 2856 { 2857 char *e; 2858 unsigned long n = simple_strtoul(buf, &e, 10); 2859 2860 if (!*buf || (*e && *e != '\n')) 2861 return -EINVAL; 2862 2863 if (mddev->pers) { 2864 int err; 2865 if (mddev->pers->check_reshape == NULL) 2866 return -EBUSY; 2867 mddev->new_layout = n; 2868 err = mddev->pers->check_reshape(mddev); 2869 if (err) { 2870 mddev->new_layout = mddev->layout; 2871 return err; 2872 } 2873 } else { 2874 mddev->new_layout = n; 2875 if (mddev->reshape_position == MaxSector) 2876 mddev->layout = n; 2877 } 2878 return len; 2879 } 2880 static struct md_sysfs_entry md_layout = 2881 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); 2882 2883 2884 static ssize_t 2885 raid_disks_show(mddev_t *mddev, char *page) 2886 { 2887 if (mddev->raid_disks == 0) 2888 return 0; 2889 if (mddev->reshape_position != MaxSector && 2890 mddev->delta_disks != 0) 2891 return sprintf(page, "%d (%d)\n", mddev->raid_disks, 2892 mddev->raid_disks - mddev->delta_disks); 2893 return sprintf(page, "%d\n", mddev->raid_disks); 2894 } 2895 2896 static int update_raid_disks(mddev_t *mddev, int raid_disks); 2897 2898 static ssize_t 2899 raid_disks_store(mddev_t *mddev, const char *buf, size_t len) 2900 { 2901 char *e; 2902 int rv = 0; 2903 unsigned long n = simple_strtoul(buf, &e, 10); 2904 2905 if (!*buf || (*e && *e != '\n')) 2906 return -EINVAL; 2907 2908 if (mddev->pers) 2909 rv = update_raid_disks(mddev, n); 2910 else if (mddev->reshape_position != MaxSector) { 2911 int olddisks = mddev->raid_disks - mddev->delta_disks; 2912 mddev->delta_disks = n - olddisks; 2913 mddev->raid_disks = n; 2914 } else 2915 mddev->raid_disks = n; 2916 return rv ? rv : len; 2917 } 2918 static struct md_sysfs_entry md_raid_disks = 2919 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); 2920 2921 static ssize_t 2922 chunk_size_show(mddev_t *mddev, char *page) 2923 { 2924 if (mddev->reshape_position != MaxSector && 2925 mddev->chunk_sectors != mddev->new_chunk_sectors) 2926 return sprintf(page, "%d (%d)\n", 2927 mddev->new_chunk_sectors << 9, 2928 mddev->chunk_sectors << 9); 2929 return sprintf(page, "%d\n", mddev->chunk_sectors << 9); 2930 } 2931 2932 static ssize_t 2933 chunk_size_store(mddev_t *mddev, const char *buf, size_t len) 2934 { 2935 char *e; 2936 unsigned long n = simple_strtoul(buf, &e, 10); 2937 2938 if (!*buf || (*e && *e != '\n')) 2939 return -EINVAL; 2940 2941 if (mddev->pers) { 2942 int err; 2943 if (mddev->pers->check_reshape == NULL) 2944 return -EBUSY; 2945 mddev->new_chunk_sectors = n >> 9; 2946 err = mddev->pers->check_reshape(mddev); 2947 if (err) { 2948 mddev->new_chunk_sectors = mddev->chunk_sectors; 2949 return err; 2950 } 2951 } else { 2952 mddev->new_chunk_sectors = n >> 9; 2953 if (mddev->reshape_position == MaxSector) 2954 mddev->chunk_sectors = n >> 9; 2955 } 2956 return len; 2957 } 2958 static struct md_sysfs_entry md_chunk_size = 2959 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); 2960 2961 static ssize_t 2962 resync_start_show(mddev_t *mddev, char *page) 2963 { 2964 if (mddev->recovery_cp == MaxSector) 2965 return sprintf(page, "none\n"); 2966 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); 2967 } 2968 2969 static ssize_t 2970 resync_start_store(mddev_t *mddev, const char *buf, size_t len) 2971 { 2972 char *e; 2973 unsigned long long n = simple_strtoull(buf, &e, 10); 2974 2975 if (mddev->pers) 2976 return -EBUSY; 2977 if (!*buf || (*e && *e != '\n')) 2978 return -EINVAL; 2979 2980 mddev->recovery_cp = n; 2981 return len; 2982 } 2983 static struct md_sysfs_entry md_resync_start = 2984 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); 2985 2986 /* 2987 * The array state can be: 2988 * 2989 * clear 2990 * No devices, no size, no level 2991 * Equivalent to STOP_ARRAY ioctl 2992 * inactive 2993 * May have some settings, but array is not active 2994 * all IO results in error 2995 * When written, doesn't tear down array, but just stops it 2996 * suspended (not supported yet) 2997 * All IO requests will block. The array can be reconfigured. 2998 * Writing this, if accepted, will block until array is quiescent 2999 * readonly 3000 * no resync can happen. no superblocks get written. 3001 * write requests fail 3002 * read-auto 3003 * like readonly, but behaves like 'clean' on a write request. 3004 * 3005 * clean - no pending writes, but otherwise active. 3006 * When written to inactive array, starts without resync 3007 * If a write request arrives then 3008 * if metadata is known, mark 'dirty' and switch to 'active'. 3009 * if not known, block and switch to write-pending 3010 * If written to an active array that has pending writes, then fails. 3011 * active 3012 * fully active: IO and resync can be happening. 3013 * When written to inactive array, starts with resync 3014 * 3015 * write-pending 3016 * clean, but writes are blocked waiting for 'active' to be written. 3017 * 3018 * active-idle 3019 * like active, but no writes have been seen for a while (100msec). 3020 * 3021 */ 3022 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, 3023 write_pending, active_idle, bad_word}; 3024 static char *array_states[] = { 3025 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", 3026 "write-pending", "active-idle", NULL }; 3027 3028 static int match_word(const char *word, char **list) 3029 { 3030 int n; 3031 for (n=0; list[n]; n++) 3032 if (cmd_match(word, list[n])) 3033 break; 3034 return n; 3035 } 3036 3037 static ssize_t 3038 array_state_show(mddev_t *mddev, char *page) 3039 { 3040 enum array_state st = inactive; 3041 3042 if (mddev->pers) 3043 switch(mddev->ro) { 3044 case 1: 3045 st = readonly; 3046 break; 3047 case 2: 3048 st = read_auto; 3049 break; 3050 case 0: 3051 if (mddev->in_sync) 3052 st = clean; 3053 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) 3054 st = write_pending; 3055 else if (mddev->safemode) 3056 st = active_idle; 3057 else 3058 st = active; 3059 } 3060 else { 3061 if (list_empty(&mddev->disks) && 3062 mddev->raid_disks == 0 && 3063 mddev->dev_sectors == 0) 3064 st = clear; 3065 else 3066 st = inactive; 3067 } 3068 return sprintf(page, "%s\n", array_states[st]); 3069 } 3070 3071 static int do_md_stop(mddev_t * mddev, int ro, int is_open); 3072 static int do_md_run(mddev_t * mddev); 3073 static int restart_array(mddev_t *mddev); 3074 3075 static ssize_t 3076 array_state_store(mddev_t *mddev, const char *buf, size_t len) 3077 { 3078 int err = -EINVAL; 3079 enum array_state st = match_word(buf, array_states); 3080 switch(st) { 3081 case bad_word: 3082 break; 3083 case clear: 3084 /* stopping an active array */ 3085 if (atomic_read(&mddev->openers) > 0) 3086 return -EBUSY; 3087 err = do_md_stop(mddev, 0, 0); 3088 break; 3089 case inactive: 3090 /* stopping an active array */ 3091 if (mddev->pers) { 3092 if (atomic_read(&mddev->openers) > 0) 3093 return -EBUSY; 3094 err = do_md_stop(mddev, 2, 0); 3095 } else 3096 err = 0; /* already inactive */ 3097 break; 3098 case suspended: 3099 break; /* not supported yet */ 3100 case readonly: 3101 if (mddev->pers) 3102 err = do_md_stop(mddev, 1, 0); 3103 else { 3104 mddev->ro = 1; 3105 set_disk_ro(mddev->gendisk, 1); 3106 err = do_md_run(mddev); 3107 } 3108 break; 3109 case read_auto: 3110 if (mddev->pers) { 3111 if (mddev->ro == 0) 3112 err = do_md_stop(mddev, 1, 0); 3113 else if (mddev->ro == 1) 3114 err = restart_array(mddev); 3115 if (err == 0) { 3116 mddev->ro = 2; 3117 set_disk_ro(mddev->gendisk, 0); 3118 } 3119 } else { 3120 mddev->ro = 2; 3121 err = do_md_run(mddev); 3122 } 3123 break; 3124 case clean: 3125 if (mddev->pers) { 3126 restart_array(mddev); 3127 spin_lock_irq(&mddev->write_lock); 3128 if (atomic_read(&mddev->writes_pending) == 0) { 3129 if (mddev->in_sync == 0) { 3130 mddev->in_sync = 1; 3131 if (mddev->safemode == 1) 3132 mddev->safemode = 0; 3133 if (mddev->persistent) 3134 set_bit(MD_CHANGE_CLEAN, 3135 &mddev->flags); 3136 } 3137 err = 0; 3138 } else 3139 err = -EBUSY; 3140 spin_unlock_irq(&mddev->write_lock); 3141 } else 3142 err = -EINVAL; 3143 break; 3144 case active: 3145 if (mddev->pers) { 3146 restart_array(mddev); 3147 if (mddev->external) 3148 clear_bit(MD_CHANGE_CLEAN, &mddev->flags); 3149 wake_up(&mddev->sb_wait); 3150 err = 0; 3151 } else { 3152 mddev->ro = 0; 3153 set_disk_ro(mddev->gendisk, 0); 3154 err = do_md_run(mddev); 3155 } 3156 break; 3157 case write_pending: 3158 case active_idle: 3159 /* these cannot be set */ 3160 break; 3161 } 3162 if (err) 3163 return err; 3164 else { 3165 sysfs_notify_dirent(mddev->sysfs_state); 3166 return len; 3167 } 3168 } 3169 static struct md_sysfs_entry md_array_state = 3170 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); 3171 3172 static ssize_t 3173 null_show(mddev_t *mddev, char *page) 3174 { 3175 return -EINVAL; 3176 } 3177 3178 static ssize_t 3179 new_dev_store(mddev_t *mddev, const char *buf, size_t len) 3180 { 3181 /* buf must be %d:%d\n? giving major and minor numbers */ 3182 /* The new device is added to the array. 3183 * If the array has a persistent superblock, we read the 3184 * superblock to initialise info and check validity. 3185 * Otherwise, only checking done is that in bind_rdev_to_array, 3186 * which mainly checks size. 3187 */ 3188 char *e; 3189 int major = simple_strtoul(buf, &e, 10); 3190 int minor; 3191 dev_t dev; 3192 mdk_rdev_t *rdev; 3193 int err; 3194 3195 if (!*buf || *e != ':' || !e[1] || e[1] == '\n') 3196 return -EINVAL; 3197 minor = simple_strtoul(e+1, &e, 10); 3198 if (*e && *e != '\n') 3199 return -EINVAL; 3200 dev = MKDEV(major, minor); 3201 if (major != MAJOR(dev) || 3202 minor != MINOR(dev)) 3203 return -EOVERFLOW; 3204 3205 3206 if (mddev->persistent) { 3207 rdev = md_import_device(dev, mddev->major_version, 3208 mddev->minor_version); 3209 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { 3210 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, 3211 mdk_rdev_t, same_set); 3212 err = super_types[mddev->major_version] 3213 .load_super(rdev, rdev0, mddev->minor_version); 3214 if (err < 0) 3215 goto out; 3216 } 3217 } else if (mddev->external) 3218 rdev = md_import_device(dev, -2, -1); 3219 else 3220 rdev = md_import_device(dev, -1, -1); 3221 3222 if (IS_ERR(rdev)) 3223 return PTR_ERR(rdev); 3224 err = bind_rdev_to_array(rdev, mddev); 3225 out: 3226 if (err) 3227 export_rdev(rdev); 3228 return err ? err : len; 3229 } 3230 3231 static struct md_sysfs_entry md_new_device = 3232 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); 3233 3234 static ssize_t 3235 bitmap_store(mddev_t *mddev, const char *buf, size_t len) 3236 { 3237 char *end; 3238 unsigned long chunk, end_chunk; 3239 3240 if (!mddev->bitmap) 3241 goto out; 3242 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ 3243 while (*buf) { 3244 chunk = end_chunk = simple_strtoul(buf, &end, 0); 3245 if (buf == end) break; 3246 if (*end == '-') { /* range */ 3247 buf = end + 1; 3248 end_chunk = simple_strtoul(buf, &end, 0); 3249 if (buf == end) break; 3250 } 3251 if (*end && !isspace(*end)) break; 3252 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); 3253 buf = end; 3254 while (isspace(*buf)) buf++; 3255 } 3256 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ 3257 out: 3258 return len; 3259 } 3260 3261 static struct md_sysfs_entry md_bitmap = 3262 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); 3263 3264 static ssize_t 3265 size_show(mddev_t *mddev, char *page) 3266 { 3267 return sprintf(page, "%llu\n", 3268 (unsigned long long)mddev->dev_sectors / 2); 3269 } 3270 3271 static int update_size(mddev_t *mddev, sector_t num_sectors); 3272 3273 static ssize_t 3274 size_store(mddev_t *mddev, const char *buf, size_t len) 3275 { 3276 /* If array is inactive, we can reduce the component size, but 3277 * not increase it (except from 0). 3278 * If array is active, we can try an on-line resize 3279 */ 3280 sector_t sectors; 3281 int err = strict_blocks_to_sectors(buf, §ors); 3282 3283 if (err < 0) 3284 return err; 3285 if (mddev->pers) { 3286 err = update_size(mddev, sectors); 3287 md_update_sb(mddev, 1); 3288 } else { 3289 if (mddev->dev_sectors == 0 || 3290 mddev->dev_sectors > sectors) 3291 mddev->dev_sectors = sectors; 3292 else 3293 err = -ENOSPC; 3294 } 3295 return err ? err : len; 3296 } 3297 3298 static struct md_sysfs_entry md_size = 3299 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); 3300 3301 3302 /* Metdata version. 3303 * This is one of 3304 * 'none' for arrays with no metadata (good luck...) 3305 * 'external' for arrays with externally managed metadata, 3306 * or N.M for internally known formats 3307 */ 3308 static ssize_t 3309 metadata_show(mddev_t *mddev, char *page) 3310 { 3311 if (mddev->persistent) 3312 return sprintf(page, "%d.%d\n", 3313 mddev->major_version, mddev->minor_version); 3314 else if (mddev->external) 3315 return sprintf(page, "external:%s\n", mddev->metadata_type); 3316 else 3317 return sprintf(page, "none\n"); 3318 } 3319 3320 static ssize_t 3321 metadata_store(mddev_t *mddev, const char *buf, size_t len) 3322 { 3323 int major, minor; 3324 char *e; 3325 /* Changing the details of 'external' metadata is 3326 * always permitted. Otherwise there must be 3327 * no devices attached to the array. 3328 */ 3329 if (mddev->external && strncmp(buf, "external:", 9) == 0) 3330 ; 3331 else if (!list_empty(&mddev->disks)) 3332 return -EBUSY; 3333 3334 if (cmd_match(buf, "none")) { 3335 mddev->persistent = 0; 3336 mddev->external = 0; 3337 mddev->major_version = 0; 3338 mddev->minor_version = 90; 3339 return len; 3340 } 3341 if (strncmp(buf, "external:", 9) == 0) { 3342 size_t namelen = len-9; 3343 if (namelen >= sizeof(mddev->metadata_type)) 3344 namelen = sizeof(mddev->metadata_type)-1; 3345 strncpy(mddev->metadata_type, buf+9, namelen); 3346 mddev->metadata_type[namelen] = 0; 3347 if (namelen && mddev->metadata_type[namelen-1] == '\n') 3348 mddev->metadata_type[--namelen] = 0; 3349 mddev->persistent = 0; 3350 mddev->external = 1; 3351 mddev->major_version = 0; 3352 mddev->minor_version = 90; 3353 return len; 3354 } 3355 major = simple_strtoul(buf, &e, 10); 3356 if (e==buf || *e != '.') 3357 return -EINVAL; 3358 buf = e+1; 3359 minor = simple_strtoul(buf, &e, 10); 3360 if (e==buf || (*e && *e != '\n') ) 3361 return -EINVAL; 3362 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) 3363 return -ENOENT; 3364 mddev->major_version = major; 3365 mddev->minor_version = minor; 3366 mddev->persistent = 1; 3367 mddev->external = 0; 3368 return len; 3369 } 3370 3371 static struct md_sysfs_entry md_metadata = 3372 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); 3373 3374 static ssize_t 3375 action_show(mddev_t *mddev, char *page) 3376 { 3377 char *type = "idle"; 3378 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 3379 type = "frozen"; 3380 else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 3381 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { 3382 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 3383 type = "reshape"; 3384 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 3385 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 3386 type = "resync"; 3387 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 3388 type = "check"; 3389 else 3390 type = "repair"; 3391 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) 3392 type = "recover"; 3393 } 3394 return sprintf(page, "%s\n", type); 3395 } 3396 3397 static ssize_t 3398 action_store(mddev_t *mddev, const char *page, size_t len) 3399 { 3400 if (!mddev->pers || !mddev->pers->sync_request) 3401 return -EINVAL; 3402 3403 if (cmd_match(page, "frozen")) 3404 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 3405 else 3406 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 3407 3408 if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { 3409 if (mddev->sync_thread) { 3410 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 3411 md_unregister_thread(mddev->sync_thread); 3412 mddev->sync_thread = NULL; 3413 mddev->recovery = 0; 3414 } 3415 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 3416 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 3417 return -EBUSY; 3418 else if (cmd_match(page, "resync")) 3419 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3420 else if (cmd_match(page, "recover")) { 3421 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 3422 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3423 } else if (cmd_match(page, "reshape")) { 3424 int err; 3425 if (mddev->pers->start_reshape == NULL) 3426 return -EINVAL; 3427 err = mddev->pers->start_reshape(mddev); 3428 if (err) 3429 return err; 3430 sysfs_notify(&mddev->kobj, NULL, "degraded"); 3431 } else { 3432 if (cmd_match(page, "check")) 3433 set_bit(MD_RECOVERY_CHECK, &mddev->recovery); 3434 else if (!cmd_match(page, "repair")) 3435 return -EINVAL; 3436 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 3437 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 3438 } 3439 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 3440 md_wakeup_thread(mddev->thread); 3441 sysfs_notify_dirent(mddev->sysfs_action); 3442 return len; 3443 } 3444 3445 static ssize_t 3446 mismatch_cnt_show(mddev_t *mddev, char *page) 3447 { 3448 return sprintf(page, "%llu\n", 3449 (unsigned long long) mddev->resync_mismatches); 3450 } 3451 3452 static struct md_sysfs_entry md_scan_mode = 3453 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); 3454 3455 3456 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); 3457 3458 static ssize_t 3459 sync_min_show(mddev_t *mddev, char *page) 3460 { 3461 return sprintf(page, "%d (%s)\n", speed_min(mddev), 3462 mddev->sync_speed_min ? "local": "system"); 3463 } 3464 3465 static ssize_t 3466 sync_min_store(mddev_t *mddev, const char *buf, size_t len) 3467 { 3468 int min; 3469 char *e; 3470 if (strncmp(buf, "system", 6)==0) { 3471 mddev->sync_speed_min = 0; 3472 return len; 3473 } 3474 min = simple_strtoul(buf, &e, 10); 3475 if (buf == e || (*e && *e != '\n') || min <= 0) 3476 return -EINVAL; 3477 mddev->sync_speed_min = min; 3478 return len; 3479 } 3480 3481 static struct md_sysfs_entry md_sync_min = 3482 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); 3483 3484 static ssize_t 3485 sync_max_show(mddev_t *mddev, char *page) 3486 { 3487 return sprintf(page, "%d (%s)\n", speed_max(mddev), 3488 mddev->sync_speed_max ? "local": "system"); 3489 } 3490 3491 static ssize_t 3492 sync_max_store(mddev_t *mddev, const char *buf, size_t len) 3493 { 3494 int max; 3495 char *e; 3496 if (strncmp(buf, "system", 6)==0) { 3497 mddev->sync_speed_max = 0; 3498 return len; 3499 } 3500 max = simple_strtoul(buf, &e, 10); 3501 if (buf == e || (*e && *e != '\n') || max <= 0) 3502 return -EINVAL; 3503 mddev->sync_speed_max = max; 3504 return len; 3505 } 3506 3507 static struct md_sysfs_entry md_sync_max = 3508 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); 3509 3510 static ssize_t 3511 degraded_show(mddev_t *mddev, char *page) 3512 { 3513 return sprintf(page, "%d\n", mddev->degraded); 3514 } 3515 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); 3516 3517 static ssize_t 3518 sync_force_parallel_show(mddev_t *mddev, char *page) 3519 { 3520 return sprintf(page, "%d\n", mddev->parallel_resync); 3521 } 3522 3523 static ssize_t 3524 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) 3525 { 3526 long n; 3527 3528 if (strict_strtol(buf, 10, &n)) 3529 return -EINVAL; 3530 3531 if (n != 0 && n != 1) 3532 return -EINVAL; 3533 3534 mddev->parallel_resync = n; 3535 3536 if (mddev->sync_thread) 3537 wake_up(&resync_wait); 3538 3539 return len; 3540 } 3541 3542 /* force parallel resync, even with shared block devices */ 3543 static struct md_sysfs_entry md_sync_force_parallel = 3544 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, 3545 sync_force_parallel_show, sync_force_parallel_store); 3546 3547 static ssize_t 3548 sync_speed_show(mddev_t *mddev, char *page) 3549 { 3550 unsigned long resync, dt, db; 3551 if (mddev->curr_resync == 0) 3552 return sprintf(page, "none\n"); 3553 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); 3554 dt = (jiffies - mddev->resync_mark) / HZ; 3555 if (!dt) dt++; 3556 db = resync - mddev->resync_mark_cnt; 3557 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ 3558 } 3559 3560 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); 3561 3562 static ssize_t 3563 sync_completed_show(mddev_t *mddev, char *page) 3564 { 3565 unsigned long max_sectors, resync; 3566 3567 if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 3568 return sprintf(page, "none\n"); 3569 3570 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 3571 max_sectors = mddev->resync_max_sectors; 3572 else 3573 max_sectors = mddev->dev_sectors; 3574 3575 resync = mddev->curr_resync_completed; 3576 return sprintf(page, "%lu / %lu\n", resync, max_sectors); 3577 } 3578 3579 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); 3580 3581 static ssize_t 3582 min_sync_show(mddev_t *mddev, char *page) 3583 { 3584 return sprintf(page, "%llu\n", 3585 (unsigned long long)mddev->resync_min); 3586 } 3587 static ssize_t 3588 min_sync_store(mddev_t *mddev, const char *buf, size_t len) 3589 { 3590 unsigned long long min; 3591 if (strict_strtoull(buf, 10, &min)) 3592 return -EINVAL; 3593 if (min > mddev->resync_max) 3594 return -EINVAL; 3595 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 3596 return -EBUSY; 3597 3598 /* Must be a multiple of chunk_size */ 3599 if (mddev->chunk_sectors) { 3600 sector_t temp = min; 3601 if (sector_div(temp, mddev->chunk_sectors)) 3602 return -EINVAL; 3603 } 3604 mddev->resync_min = min; 3605 3606 return len; 3607 } 3608 3609 static struct md_sysfs_entry md_min_sync = 3610 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); 3611 3612 static ssize_t 3613 max_sync_show(mddev_t *mddev, char *page) 3614 { 3615 if (mddev->resync_max == MaxSector) 3616 return sprintf(page, "max\n"); 3617 else 3618 return sprintf(page, "%llu\n", 3619 (unsigned long long)mddev->resync_max); 3620 } 3621 static ssize_t 3622 max_sync_store(mddev_t *mddev, const char *buf, size_t len) 3623 { 3624 if (strncmp(buf, "max", 3) == 0) 3625 mddev->resync_max = MaxSector; 3626 else { 3627 unsigned long long max; 3628 if (strict_strtoull(buf, 10, &max)) 3629 return -EINVAL; 3630 if (max < mddev->resync_min) 3631 return -EINVAL; 3632 if (max < mddev->resync_max && 3633 mddev->ro == 0 && 3634 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 3635 return -EBUSY; 3636 3637 /* Must be a multiple of chunk_size */ 3638 if (mddev->chunk_sectors) { 3639 sector_t temp = max; 3640 if (sector_div(temp, mddev->chunk_sectors)) 3641 return -EINVAL; 3642 } 3643 mddev->resync_max = max; 3644 } 3645 wake_up(&mddev->recovery_wait); 3646 return len; 3647 } 3648 3649 static struct md_sysfs_entry md_max_sync = 3650 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); 3651 3652 static ssize_t 3653 suspend_lo_show(mddev_t *mddev, char *page) 3654 { 3655 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); 3656 } 3657 3658 static ssize_t 3659 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) 3660 { 3661 char *e; 3662 unsigned long long new = simple_strtoull(buf, &e, 10); 3663 3664 if (mddev->pers == NULL || 3665 mddev->pers->quiesce == NULL) 3666 return -EINVAL; 3667 if (buf == e || (*e && *e != '\n')) 3668 return -EINVAL; 3669 if (new >= mddev->suspend_hi || 3670 (new > mddev->suspend_lo && new < mddev->suspend_hi)) { 3671 mddev->suspend_lo = new; 3672 mddev->pers->quiesce(mddev, 2); 3673 return len; 3674 } else 3675 return -EINVAL; 3676 } 3677 static struct md_sysfs_entry md_suspend_lo = 3678 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); 3679 3680 3681 static ssize_t 3682 suspend_hi_show(mddev_t *mddev, char *page) 3683 { 3684 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); 3685 } 3686 3687 static ssize_t 3688 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) 3689 { 3690 char *e; 3691 unsigned long long new = simple_strtoull(buf, &e, 10); 3692 3693 if (mddev->pers == NULL || 3694 mddev->pers->quiesce == NULL) 3695 return -EINVAL; 3696 if (buf == e || (*e && *e != '\n')) 3697 return -EINVAL; 3698 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || 3699 (new > mddev->suspend_lo && new > mddev->suspend_hi)) { 3700 mddev->suspend_hi = new; 3701 mddev->pers->quiesce(mddev, 1); 3702 mddev->pers->quiesce(mddev, 0); 3703 return len; 3704 } else 3705 return -EINVAL; 3706 } 3707 static struct md_sysfs_entry md_suspend_hi = 3708 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); 3709 3710 static ssize_t 3711 reshape_position_show(mddev_t *mddev, char *page) 3712 { 3713 if (mddev->reshape_position != MaxSector) 3714 return sprintf(page, "%llu\n", 3715 (unsigned long long)mddev->reshape_position); 3716 strcpy(page, "none\n"); 3717 return 5; 3718 } 3719 3720 static ssize_t 3721 reshape_position_store(mddev_t *mddev, const char *buf, size_t len) 3722 { 3723 char *e; 3724 unsigned long long new = simple_strtoull(buf, &e, 10); 3725 if (mddev->pers) 3726 return -EBUSY; 3727 if (buf == e || (*e && *e != '\n')) 3728 return -EINVAL; 3729 mddev->reshape_position = new; 3730 mddev->delta_disks = 0; 3731 mddev->new_level = mddev->level; 3732 mddev->new_layout = mddev->layout; 3733 mddev->new_chunk_sectors = mddev->chunk_sectors; 3734 return len; 3735 } 3736 3737 static struct md_sysfs_entry md_reshape_position = 3738 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, 3739 reshape_position_store); 3740 3741 static ssize_t 3742 array_size_show(mddev_t *mddev, char *page) 3743 { 3744 if (mddev->external_size) 3745 return sprintf(page, "%llu\n", 3746 (unsigned long long)mddev->array_sectors/2); 3747 else 3748 return sprintf(page, "default\n"); 3749 } 3750 3751 static ssize_t 3752 array_size_store(mddev_t *mddev, const char *buf, size_t len) 3753 { 3754 sector_t sectors; 3755 3756 if (strncmp(buf, "default", 7) == 0) { 3757 if (mddev->pers) 3758 sectors = mddev->pers->size(mddev, 0, 0); 3759 else 3760 sectors = mddev->array_sectors; 3761 3762 mddev->external_size = 0; 3763 } else { 3764 if (strict_blocks_to_sectors(buf, §ors) < 0) 3765 return -EINVAL; 3766 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) 3767 return -E2BIG; 3768 3769 mddev->external_size = 1; 3770 } 3771 3772 mddev->array_sectors = sectors; 3773 set_capacity(mddev->gendisk, mddev->array_sectors); 3774 if (mddev->pers) 3775 revalidate_disk(mddev->gendisk); 3776 3777 return len; 3778 } 3779 3780 static struct md_sysfs_entry md_array_size = 3781 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, 3782 array_size_store); 3783 3784 static struct attribute *md_default_attrs[] = { 3785 &md_level.attr, 3786 &md_layout.attr, 3787 &md_raid_disks.attr, 3788 &md_chunk_size.attr, 3789 &md_size.attr, 3790 &md_resync_start.attr, 3791 &md_metadata.attr, 3792 &md_new_device.attr, 3793 &md_safe_delay.attr, 3794 &md_array_state.attr, 3795 &md_reshape_position.attr, 3796 &md_array_size.attr, 3797 NULL, 3798 }; 3799 3800 static struct attribute *md_redundancy_attrs[] = { 3801 &md_scan_mode.attr, 3802 &md_mismatches.attr, 3803 &md_sync_min.attr, 3804 &md_sync_max.attr, 3805 &md_sync_speed.attr, 3806 &md_sync_force_parallel.attr, 3807 &md_sync_completed.attr, 3808 &md_min_sync.attr, 3809 &md_max_sync.attr, 3810 &md_suspend_lo.attr, 3811 &md_suspend_hi.attr, 3812 &md_bitmap.attr, 3813 &md_degraded.attr, 3814 NULL, 3815 }; 3816 static struct attribute_group md_redundancy_group = { 3817 .name = NULL, 3818 .attrs = md_redundancy_attrs, 3819 }; 3820 3821 3822 static ssize_t 3823 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) 3824 { 3825 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 3826 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 3827 ssize_t rv; 3828 3829 if (!entry->show) 3830 return -EIO; 3831 rv = mddev_lock(mddev); 3832 if (!rv) { 3833 rv = entry->show(mddev, page); 3834 mddev_unlock(mddev); 3835 } 3836 return rv; 3837 } 3838 3839 static ssize_t 3840 md_attr_store(struct kobject *kobj, struct attribute *attr, 3841 const char *page, size_t length) 3842 { 3843 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); 3844 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); 3845 ssize_t rv; 3846 3847 if (!entry->store) 3848 return -EIO; 3849 if (!capable(CAP_SYS_ADMIN)) 3850 return -EACCES; 3851 rv = mddev_lock(mddev); 3852 if (mddev->hold_active == UNTIL_IOCTL) 3853 mddev->hold_active = 0; 3854 if (!rv) { 3855 rv = entry->store(mddev, page, length); 3856 mddev_unlock(mddev); 3857 } 3858 return rv; 3859 } 3860 3861 static void md_free(struct kobject *ko) 3862 { 3863 mddev_t *mddev = container_of(ko, mddev_t, kobj); 3864 3865 if (mddev->sysfs_state) 3866 sysfs_put(mddev->sysfs_state); 3867 3868 if (mddev->gendisk) { 3869 del_gendisk(mddev->gendisk); 3870 put_disk(mddev->gendisk); 3871 } 3872 if (mddev->queue) 3873 blk_cleanup_queue(mddev->queue); 3874 3875 kfree(mddev); 3876 } 3877 3878 static struct sysfs_ops md_sysfs_ops = { 3879 .show = md_attr_show, 3880 .store = md_attr_store, 3881 }; 3882 static struct kobj_type md_ktype = { 3883 .release = md_free, 3884 .sysfs_ops = &md_sysfs_ops, 3885 .default_attrs = md_default_attrs, 3886 }; 3887 3888 int mdp_major = 0; 3889 3890 static void mddev_delayed_delete(struct work_struct *ws) 3891 { 3892 mddev_t *mddev = container_of(ws, mddev_t, del_work); 3893 3894 if (mddev->private == &md_redundancy_group) { 3895 sysfs_remove_group(&mddev->kobj, &md_redundancy_group); 3896 if (mddev->sysfs_action) 3897 sysfs_put(mddev->sysfs_action); 3898 mddev->sysfs_action = NULL; 3899 mddev->private = NULL; 3900 } 3901 kobject_del(&mddev->kobj); 3902 kobject_put(&mddev->kobj); 3903 } 3904 3905 static int md_alloc(dev_t dev, char *name) 3906 { 3907 static DEFINE_MUTEX(disks_mutex); 3908 mddev_t *mddev = mddev_find(dev); 3909 struct gendisk *disk; 3910 int partitioned; 3911 int shift; 3912 int unit; 3913 int error; 3914 3915 if (!mddev) 3916 return -ENODEV; 3917 3918 partitioned = (MAJOR(mddev->unit) != MD_MAJOR); 3919 shift = partitioned ? MdpMinorShift : 0; 3920 unit = MINOR(mddev->unit) >> shift; 3921 3922 /* wait for any previous instance if this device 3923 * to be completed removed (mddev_delayed_delete). 3924 */ 3925 flush_scheduled_work(); 3926 3927 mutex_lock(&disks_mutex); 3928 error = -EEXIST; 3929 if (mddev->gendisk) 3930 goto abort; 3931 3932 if (name) { 3933 /* Need to ensure that 'name' is not a duplicate. 3934 */ 3935 mddev_t *mddev2; 3936 spin_lock(&all_mddevs_lock); 3937 3938 list_for_each_entry(mddev2, &all_mddevs, all_mddevs) 3939 if (mddev2->gendisk && 3940 strcmp(mddev2->gendisk->disk_name, name) == 0) { 3941 spin_unlock(&all_mddevs_lock); 3942 goto abort; 3943 } 3944 spin_unlock(&all_mddevs_lock); 3945 } 3946 3947 error = -ENOMEM; 3948 mddev->queue = blk_alloc_queue(GFP_KERNEL); 3949 if (!mddev->queue) 3950 goto abort; 3951 mddev->queue->queuedata = mddev; 3952 3953 /* Can be unlocked because the queue is new: no concurrency */ 3954 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); 3955 3956 blk_queue_make_request(mddev->queue, md_make_request); 3957 3958 disk = alloc_disk(1 << shift); 3959 if (!disk) { 3960 blk_cleanup_queue(mddev->queue); 3961 mddev->queue = NULL; 3962 goto abort; 3963 } 3964 disk->major = MAJOR(mddev->unit); 3965 disk->first_minor = unit << shift; 3966 if (name) 3967 strcpy(disk->disk_name, name); 3968 else if (partitioned) 3969 sprintf(disk->disk_name, "md_d%d", unit); 3970 else 3971 sprintf(disk->disk_name, "md%d", unit); 3972 disk->fops = &md_fops; 3973 disk->private_data = mddev; 3974 disk->queue = mddev->queue; 3975 /* Allow extended partitions. This makes the 3976 * 'mdp' device redundant, but we can't really 3977 * remove it now. 3978 */ 3979 disk->flags |= GENHD_FL_EXT_DEVT; 3980 add_disk(disk); 3981 mddev->gendisk = disk; 3982 error = kobject_init_and_add(&mddev->kobj, &md_ktype, 3983 &disk_to_dev(disk)->kobj, "%s", "md"); 3984 if (error) { 3985 /* This isn't possible, but as kobject_init_and_add is marked 3986 * __must_check, we must do something with the result 3987 */ 3988 printk(KERN_WARNING "md: cannot register %s/md - name in use\n", 3989 disk->disk_name); 3990 error = 0; 3991 } 3992 abort: 3993 mutex_unlock(&disks_mutex); 3994 if (!error) { 3995 kobject_uevent(&mddev->kobj, KOBJ_ADD); 3996 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); 3997 } 3998 mddev_put(mddev); 3999 return error; 4000 } 4001 4002 static struct kobject *md_probe(dev_t dev, int *part, void *data) 4003 { 4004 md_alloc(dev, NULL); 4005 return NULL; 4006 } 4007 4008 static int add_named_array(const char *val, struct kernel_param *kp) 4009 { 4010 /* val must be "md_*" where * is not all digits. 4011 * We allocate an array with a large free minor number, and 4012 * set the name to val. val must not already be an active name. 4013 */ 4014 int len = strlen(val); 4015 char buf[DISK_NAME_LEN]; 4016 4017 while (len && val[len-1] == '\n') 4018 len--; 4019 if (len >= DISK_NAME_LEN) 4020 return -E2BIG; 4021 strlcpy(buf, val, len+1); 4022 if (strncmp(buf, "md_", 3) != 0) 4023 return -EINVAL; 4024 return md_alloc(0, buf); 4025 } 4026 4027 static void md_safemode_timeout(unsigned long data) 4028 { 4029 mddev_t *mddev = (mddev_t *) data; 4030 4031 if (!atomic_read(&mddev->writes_pending)) { 4032 mddev->safemode = 1; 4033 if (mddev->external) 4034 sysfs_notify_dirent(mddev->sysfs_state); 4035 } 4036 md_wakeup_thread(mddev->thread); 4037 } 4038 4039 static int start_dirty_degraded; 4040 4041 static int do_md_run(mddev_t * mddev) 4042 { 4043 int err; 4044 mdk_rdev_t *rdev; 4045 struct gendisk *disk; 4046 struct mdk_personality *pers; 4047 4048 if (list_empty(&mddev->disks)) 4049 /* cannot run an array with no devices.. */ 4050 return -EINVAL; 4051 4052 if (mddev->pers) 4053 return -EBUSY; 4054 4055 /* 4056 * Analyze all RAID superblock(s) 4057 */ 4058 if (!mddev->raid_disks) { 4059 if (!mddev->persistent) 4060 return -EINVAL; 4061 analyze_sbs(mddev); 4062 } 4063 4064 if (mddev->level != LEVEL_NONE) 4065 request_module("md-level-%d", mddev->level); 4066 else if (mddev->clevel[0]) 4067 request_module("md-%s", mddev->clevel); 4068 4069 /* 4070 * Drop all container device buffers, from now on 4071 * the only valid external interface is through the md 4072 * device. 4073 */ 4074 list_for_each_entry(rdev, &mddev->disks, same_set) { 4075 if (test_bit(Faulty, &rdev->flags)) 4076 continue; 4077 sync_blockdev(rdev->bdev); 4078 invalidate_bdev(rdev->bdev); 4079 4080 /* perform some consistency tests on the device. 4081 * We don't want the data to overlap the metadata, 4082 * Internal Bitmap issues have been handled elsewhere. 4083 */ 4084 if (rdev->data_offset < rdev->sb_start) { 4085 if (mddev->dev_sectors && 4086 rdev->data_offset + mddev->dev_sectors 4087 > rdev->sb_start) { 4088 printk("md: %s: data overlaps metadata\n", 4089 mdname(mddev)); 4090 return -EINVAL; 4091 } 4092 } else { 4093 if (rdev->sb_start + rdev->sb_size/512 4094 > rdev->data_offset) { 4095 printk("md: %s: metadata overlaps data\n", 4096 mdname(mddev)); 4097 return -EINVAL; 4098 } 4099 } 4100 sysfs_notify_dirent(rdev->sysfs_state); 4101 } 4102 4103 md_probe(mddev->unit, NULL, NULL); 4104 disk = mddev->gendisk; 4105 if (!disk) 4106 return -ENOMEM; 4107 4108 spin_lock(&pers_lock); 4109 pers = find_pers(mddev->level, mddev->clevel); 4110 if (!pers || !try_module_get(pers->owner)) { 4111 spin_unlock(&pers_lock); 4112 if (mddev->level != LEVEL_NONE) 4113 printk(KERN_WARNING "md: personality for level %d is not loaded!\n", 4114 mddev->level); 4115 else 4116 printk(KERN_WARNING "md: personality for level %s is not loaded!\n", 4117 mddev->clevel); 4118 return -EINVAL; 4119 } 4120 mddev->pers = pers; 4121 spin_unlock(&pers_lock); 4122 if (mddev->level != pers->level) { 4123 mddev->level = pers->level; 4124 mddev->new_level = pers->level; 4125 } 4126 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); 4127 4128 if (mddev->reshape_position != MaxSector && 4129 pers->start_reshape == NULL) { 4130 /* This personality cannot handle reshaping... */ 4131 mddev->pers = NULL; 4132 module_put(pers->owner); 4133 return -EINVAL; 4134 } 4135 4136 if (pers->sync_request) { 4137 /* Warn if this is a potentially silly 4138 * configuration. 4139 */ 4140 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 4141 mdk_rdev_t *rdev2; 4142 int warned = 0; 4143 4144 list_for_each_entry(rdev, &mddev->disks, same_set) 4145 list_for_each_entry(rdev2, &mddev->disks, same_set) { 4146 if (rdev < rdev2 && 4147 rdev->bdev->bd_contains == 4148 rdev2->bdev->bd_contains) { 4149 printk(KERN_WARNING 4150 "%s: WARNING: %s appears to be" 4151 " on the same physical disk as" 4152 " %s.\n", 4153 mdname(mddev), 4154 bdevname(rdev->bdev,b), 4155 bdevname(rdev2->bdev,b2)); 4156 warned = 1; 4157 } 4158 } 4159 4160 if (warned) 4161 printk(KERN_WARNING 4162 "True protection against single-disk" 4163 " failure might be compromised.\n"); 4164 } 4165 4166 mddev->recovery = 0; 4167 /* may be over-ridden by personality */ 4168 mddev->resync_max_sectors = mddev->dev_sectors; 4169 4170 mddev->barriers_work = 1; 4171 mddev->ok_start_degraded = start_dirty_degraded; 4172 4173 if (start_readonly) 4174 mddev->ro = 2; /* read-only, but switch on first write */ 4175 4176 err = mddev->pers->run(mddev); 4177 if (err) 4178 printk(KERN_ERR "md: pers->run() failed ...\n"); 4179 else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { 4180 WARN_ONCE(!mddev->external_size, "%s: default size too small," 4181 " but 'external_size' not in effect?\n", __func__); 4182 printk(KERN_ERR 4183 "md: invalid array_size %llu > default size %llu\n", 4184 (unsigned long long)mddev->array_sectors / 2, 4185 (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); 4186 err = -EINVAL; 4187 mddev->pers->stop(mddev); 4188 } 4189 if (err == 0 && mddev->pers->sync_request) { 4190 err = bitmap_create(mddev); 4191 if (err) { 4192 printk(KERN_ERR "%s: failed to create bitmap (%d)\n", 4193 mdname(mddev), err); 4194 mddev->pers->stop(mddev); 4195 } 4196 } 4197 if (err) { 4198 module_put(mddev->pers->owner); 4199 mddev->pers = NULL; 4200 bitmap_destroy(mddev); 4201 return err; 4202 } 4203 if (mddev->pers->sync_request) { 4204 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) 4205 printk(KERN_WARNING 4206 "md: cannot register extra attributes for %s\n", 4207 mdname(mddev)); 4208 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); 4209 } else if (mddev->ro == 2) /* auto-readonly not meaningful */ 4210 mddev->ro = 0; 4211 4212 atomic_set(&mddev->writes_pending,0); 4213 mddev->safemode = 0; 4214 mddev->safemode_timer.function = md_safemode_timeout; 4215 mddev->safemode_timer.data = (unsigned long) mddev; 4216 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ 4217 mddev->in_sync = 1; 4218 4219 list_for_each_entry(rdev, &mddev->disks, same_set) 4220 if (rdev->raid_disk >= 0) { 4221 char nm[20]; 4222 sprintf(nm, "rd%d", rdev->raid_disk); 4223 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) 4224 printk("md: cannot register %s for %s\n", 4225 nm, mdname(mddev)); 4226 } 4227 4228 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4229 4230 if (mddev->flags) 4231 md_update_sb(mddev, 0); 4232 4233 set_capacity(disk, mddev->array_sectors); 4234 4235 /* If there is a partially-recovered drive we need to 4236 * start recovery here. If we leave it to md_check_recovery, 4237 * it will remove the drives and not do the right thing 4238 */ 4239 if (mddev->degraded && !mddev->sync_thread) { 4240 int spares = 0; 4241 list_for_each_entry(rdev, &mddev->disks, same_set) 4242 if (rdev->raid_disk >= 0 && 4243 !test_bit(In_sync, &rdev->flags) && 4244 !test_bit(Faulty, &rdev->flags)) 4245 /* complete an interrupted recovery */ 4246 spares++; 4247 if (spares && mddev->pers->sync_request) { 4248 mddev->recovery = 0; 4249 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 4250 mddev->sync_thread = md_register_thread(md_do_sync, 4251 mddev, 4252 "resync"); 4253 if (!mddev->sync_thread) { 4254 printk(KERN_ERR "%s: could not start resync" 4255 " thread...\n", 4256 mdname(mddev)); 4257 /* leave the spares where they are, it shouldn't hurt */ 4258 mddev->recovery = 0; 4259 } 4260 } 4261 } 4262 md_wakeup_thread(mddev->thread); 4263 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ 4264 4265 revalidate_disk(mddev->gendisk); 4266 mddev->changed = 1; 4267 md_new_event(mddev); 4268 sysfs_notify_dirent(mddev->sysfs_state); 4269 if (mddev->sysfs_action) 4270 sysfs_notify_dirent(mddev->sysfs_action); 4271 sysfs_notify(&mddev->kobj, NULL, "degraded"); 4272 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 4273 return 0; 4274 } 4275 4276 static int restart_array(mddev_t *mddev) 4277 { 4278 struct gendisk *disk = mddev->gendisk; 4279 4280 /* Complain if it has no devices */ 4281 if (list_empty(&mddev->disks)) 4282 return -ENXIO; 4283 if (!mddev->pers) 4284 return -EINVAL; 4285 if (!mddev->ro) 4286 return -EBUSY; 4287 mddev->safemode = 0; 4288 mddev->ro = 0; 4289 set_disk_ro(disk, 0); 4290 printk(KERN_INFO "md: %s switched to read-write mode.\n", 4291 mdname(mddev)); 4292 /* Kick recovery or resync if necessary */ 4293 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4294 md_wakeup_thread(mddev->thread); 4295 md_wakeup_thread(mddev->sync_thread); 4296 sysfs_notify_dirent(mddev->sysfs_state); 4297 return 0; 4298 } 4299 4300 /* similar to deny_write_access, but accounts for our holding a reference 4301 * to the file ourselves */ 4302 static int deny_bitmap_write_access(struct file * file) 4303 { 4304 struct inode *inode = file->f_mapping->host; 4305 4306 spin_lock(&inode->i_lock); 4307 if (atomic_read(&inode->i_writecount) > 1) { 4308 spin_unlock(&inode->i_lock); 4309 return -ETXTBSY; 4310 } 4311 atomic_set(&inode->i_writecount, -1); 4312 spin_unlock(&inode->i_lock); 4313 4314 return 0; 4315 } 4316 4317 static void restore_bitmap_write_access(struct file *file) 4318 { 4319 struct inode *inode = file->f_mapping->host; 4320 4321 spin_lock(&inode->i_lock); 4322 atomic_set(&inode->i_writecount, 1); 4323 spin_unlock(&inode->i_lock); 4324 } 4325 4326 /* mode: 4327 * 0 - completely stop and dis-assemble array 4328 * 1 - switch to readonly 4329 * 2 - stop but do not disassemble array 4330 */ 4331 static int do_md_stop(mddev_t * mddev, int mode, int is_open) 4332 { 4333 int err = 0; 4334 struct gendisk *disk = mddev->gendisk; 4335 mdk_rdev_t *rdev; 4336 4337 mutex_lock(&mddev->open_mutex); 4338 if (atomic_read(&mddev->openers) > is_open) { 4339 printk("md: %s still in use.\n",mdname(mddev)); 4340 err = -EBUSY; 4341 } else if (mddev->pers) { 4342 4343 if (mddev->sync_thread) { 4344 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4345 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 4346 md_unregister_thread(mddev->sync_thread); 4347 mddev->sync_thread = NULL; 4348 } 4349 4350 del_timer_sync(&mddev->safemode_timer); 4351 4352 switch(mode) { 4353 case 1: /* readonly */ 4354 err = -ENXIO; 4355 if (mddev->ro==1) 4356 goto out; 4357 mddev->ro = 1; 4358 break; 4359 case 0: /* disassemble */ 4360 case 2: /* stop */ 4361 bitmap_flush(mddev); 4362 md_super_wait(mddev); 4363 if (mddev->ro) 4364 set_disk_ro(disk, 0); 4365 4366 mddev->pers->stop(mddev); 4367 mddev->queue->merge_bvec_fn = NULL; 4368 mddev->queue->unplug_fn = NULL; 4369 mddev->queue->backing_dev_info.congested_fn = NULL; 4370 module_put(mddev->pers->owner); 4371 if (mddev->pers->sync_request) 4372 mddev->private = &md_redundancy_group; 4373 mddev->pers = NULL; 4374 /* tell userspace to handle 'inactive' */ 4375 sysfs_notify_dirent(mddev->sysfs_state); 4376 4377 list_for_each_entry(rdev, &mddev->disks, same_set) 4378 if (rdev->raid_disk >= 0) { 4379 char nm[20]; 4380 sprintf(nm, "rd%d", rdev->raid_disk); 4381 sysfs_remove_link(&mddev->kobj, nm); 4382 } 4383 4384 set_capacity(disk, 0); 4385 mddev->changed = 1; 4386 4387 if (mddev->ro) 4388 mddev->ro = 0; 4389 } 4390 if (!mddev->in_sync || mddev->flags) { 4391 /* mark array as shutdown cleanly */ 4392 mddev->in_sync = 1; 4393 md_update_sb(mddev, 1); 4394 } 4395 if (mode == 1) 4396 set_disk_ro(disk, 1); 4397 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 4398 err = 0; 4399 } 4400 out: 4401 mutex_unlock(&mddev->open_mutex); 4402 if (err) 4403 return err; 4404 /* 4405 * Free resources if final stop 4406 */ 4407 if (mode == 0) { 4408 4409 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); 4410 4411 bitmap_destroy(mddev); 4412 if (mddev->bitmap_file) { 4413 restore_bitmap_write_access(mddev->bitmap_file); 4414 fput(mddev->bitmap_file); 4415 mddev->bitmap_file = NULL; 4416 } 4417 mddev->bitmap_offset = 0; 4418 4419 /* make sure all md_delayed_delete calls have finished */ 4420 flush_scheduled_work(); 4421 4422 export_array(mddev); 4423 4424 mddev->array_sectors = 0; 4425 mddev->external_size = 0; 4426 mddev->dev_sectors = 0; 4427 mddev->raid_disks = 0; 4428 mddev->recovery_cp = 0; 4429 mddev->resync_min = 0; 4430 mddev->resync_max = MaxSector; 4431 mddev->reshape_position = MaxSector; 4432 mddev->external = 0; 4433 mddev->persistent = 0; 4434 mddev->level = LEVEL_NONE; 4435 mddev->clevel[0] = 0; 4436 mddev->flags = 0; 4437 mddev->ro = 0; 4438 mddev->metadata_type[0] = 0; 4439 mddev->chunk_sectors = 0; 4440 mddev->ctime = mddev->utime = 0; 4441 mddev->layout = 0; 4442 mddev->max_disks = 0; 4443 mddev->events = 0; 4444 mddev->delta_disks = 0; 4445 mddev->new_level = LEVEL_NONE; 4446 mddev->new_layout = 0; 4447 mddev->new_chunk_sectors = 0; 4448 mddev->curr_resync = 0; 4449 mddev->resync_mismatches = 0; 4450 mddev->suspend_lo = mddev->suspend_hi = 0; 4451 mddev->sync_speed_min = mddev->sync_speed_max = 0; 4452 mddev->recovery = 0; 4453 mddev->in_sync = 0; 4454 mddev->changed = 0; 4455 mddev->degraded = 0; 4456 mddev->barriers_work = 0; 4457 mddev->safemode = 0; 4458 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); 4459 if (mddev->hold_active == UNTIL_STOP) 4460 mddev->hold_active = 0; 4461 4462 } else if (mddev->pers) 4463 printk(KERN_INFO "md: %s switched to read-only mode.\n", 4464 mdname(mddev)); 4465 err = 0; 4466 blk_integrity_unregister(disk); 4467 md_new_event(mddev); 4468 sysfs_notify_dirent(mddev->sysfs_state); 4469 return err; 4470 } 4471 4472 #ifndef MODULE 4473 static void autorun_array(mddev_t *mddev) 4474 { 4475 mdk_rdev_t *rdev; 4476 int err; 4477 4478 if (list_empty(&mddev->disks)) 4479 return; 4480 4481 printk(KERN_INFO "md: running: "); 4482 4483 list_for_each_entry(rdev, &mddev->disks, same_set) { 4484 char b[BDEVNAME_SIZE]; 4485 printk("<%s>", bdevname(rdev->bdev,b)); 4486 } 4487 printk("\n"); 4488 4489 err = do_md_run(mddev); 4490 if (err) { 4491 printk(KERN_WARNING "md: do_md_run() returned %d\n", err); 4492 do_md_stop(mddev, 0, 0); 4493 } 4494 } 4495 4496 /* 4497 * lets try to run arrays based on all disks that have arrived 4498 * until now. (those are in pending_raid_disks) 4499 * 4500 * the method: pick the first pending disk, collect all disks with 4501 * the same UUID, remove all from the pending list and put them into 4502 * the 'same_array' list. Then order this list based on superblock 4503 * update time (freshest comes first), kick out 'old' disks and 4504 * compare superblocks. If everything's fine then run it. 4505 * 4506 * If "unit" is allocated, then bump its reference count 4507 */ 4508 static void autorun_devices(int part) 4509 { 4510 mdk_rdev_t *rdev0, *rdev, *tmp; 4511 mddev_t *mddev; 4512 char b[BDEVNAME_SIZE]; 4513 4514 printk(KERN_INFO "md: autorun ...\n"); 4515 while (!list_empty(&pending_raid_disks)) { 4516 int unit; 4517 dev_t dev; 4518 LIST_HEAD(candidates); 4519 rdev0 = list_entry(pending_raid_disks.next, 4520 mdk_rdev_t, same_set); 4521 4522 printk(KERN_INFO "md: considering %s ...\n", 4523 bdevname(rdev0->bdev,b)); 4524 INIT_LIST_HEAD(&candidates); 4525 rdev_for_each_list(rdev, tmp, &pending_raid_disks) 4526 if (super_90_load(rdev, rdev0, 0) >= 0) { 4527 printk(KERN_INFO "md: adding %s ...\n", 4528 bdevname(rdev->bdev,b)); 4529 list_move(&rdev->same_set, &candidates); 4530 } 4531 /* 4532 * now we have a set of devices, with all of them having 4533 * mostly sane superblocks. It's time to allocate the 4534 * mddev. 4535 */ 4536 if (part) { 4537 dev = MKDEV(mdp_major, 4538 rdev0->preferred_minor << MdpMinorShift); 4539 unit = MINOR(dev) >> MdpMinorShift; 4540 } else { 4541 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); 4542 unit = MINOR(dev); 4543 } 4544 if (rdev0->preferred_minor != unit) { 4545 printk(KERN_INFO "md: unit number in %s is bad: %d\n", 4546 bdevname(rdev0->bdev, b), rdev0->preferred_minor); 4547 break; 4548 } 4549 4550 md_probe(dev, NULL, NULL); 4551 mddev = mddev_find(dev); 4552 if (!mddev || !mddev->gendisk) { 4553 if (mddev) 4554 mddev_put(mddev); 4555 printk(KERN_ERR 4556 "md: cannot allocate memory for md drive.\n"); 4557 break; 4558 } 4559 if (mddev_lock(mddev)) 4560 printk(KERN_WARNING "md: %s locked, cannot run\n", 4561 mdname(mddev)); 4562 else if (mddev->raid_disks || mddev->major_version 4563 || !list_empty(&mddev->disks)) { 4564 printk(KERN_WARNING 4565 "md: %s already running, cannot run %s\n", 4566 mdname(mddev), bdevname(rdev0->bdev,b)); 4567 mddev_unlock(mddev); 4568 } else { 4569 printk(KERN_INFO "md: created %s\n", mdname(mddev)); 4570 mddev->persistent = 1; 4571 rdev_for_each_list(rdev, tmp, &candidates) { 4572 list_del_init(&rdev->same_set); 4573 if (bind_rdev_to_array(rdev, mddev)) 4574 export_rdev(rdev); 4575 } 4576 autorun_array(mddev); 4577 mddev_unlock(mddev); 4578 } 4579 /* on success, candidates will be empty, on error 4580 * it won't... 4581 */ 4582 rdev_for_each_list(rdev, tmp, &candidates) { 4583 list_del_init(&rdev->same_set); 4584 export_rdev(rdev); 4585 } 4586 mddev_put(mddev); 4587 } 4588 printk(KERN_INFO "md: ... autorun DONE.\n"); 4589 } 4590 #endif /* !MODULE */ 4591 4592 static int get_version(void __user * arg) 4593 { 4594 mdu_version_t ver; 4595 4596 ver.major = MD_MAJOR_VERSION; 4597 ver.minor = MD_MINOR_VERSION; 4598 ver.patchlevel = MD_PATCHLEVEL_VERSION; 4599 4600 if (copy_to_user(arg, &ver, sizeof(ver))) 4601 return -EFAULT; 4602 4603 return 0; 4604 } 4605 4606 static int get_array_info(mddev_t * mddev, void __user * arg) 4607 { 4608 mdu_array_info_t info; 4609 int nr,working,insync,failed,spare; 4610 mdk_rdev_t *rdev; 4611 4612 nr=working=insync=failed=spare=0; 4613 list_for_each_entry(rdev, &mddev->disks, same_set) { 4614 nr++; 4615 if (test_bit(Faulty, &rdev->flags)) 4616 failed++; 4617 else { 4618 working++; 4619 if (test_bit(In_sync, &rdev->flags)) 4620 insync++; 4621 else 4622 spare++; 4623 } 4624 } 4625 4626 info.major_version = mddev->major_version; 4627 info.minor_version = mddev->minor_version; 4628 info.patch_version = MD_PATCHLEVEL_VERSION; 4629 info.ctime = mddev->ctime; 4630 info.level = mddev->level; 4631 info.size = mddev->dev_sectors / 2; 4632 if (info.size != mddev->dev_sectors / 2) /* overflow */ 4633 info.size = -1; 4634 info.nr_disks = nr; 4635 info.raid_disks = mddev->raid_disks; 4636 info.md_minor = mddev->md_minor; 4637 info.not_persistent= !mddev->persistent; 4638 4639 info.utime = mddev->utime; 4640 info.state = 0; 4641 if (mddev->in_sync) 4642 info.state = (1<<MD_SB_CLEAN); 4643 if (mddev->bitmap && mddev->bitmap_offset) 4644 info.state = (1<<MD_SB_BITMAP_PRESENT); 4645 info.active_disks = insync; 4646 info.working_disks = working; 4647 info.failed_disks = failed; 4648 info.spare_disks = spare; 4649 4650 info.layout = mddev->layout; 4651 info.chunk_size = mddev->chunk_sectors << 9; 4652 4653 if (copy_to_user(arg, &info, sizeof(info))) 4654 return -EFAULT; 4655 4656 return 0; 4657 } 4658 4659 static int get_bitmap_file(mddev_t * mddev, void __user * arg) 4660 { 4661 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ 4662 char *ptr, *buf = NULL; 4663 int err = -ENOMEM; 4664 4665 if (md_allow_write(mddev)) 4666 file = kmalloc(sizeof(*file), GFP_NOIO); 4667 else 4668 file = kmalloc(sizeof(*file), GFP_KERNEL); 4669 4670 if (!file) 4671 goto out; 4672 4673 /* bitmap disabled, zero the first byte and copy out */ 4674 if (!mddev->bitmap || !mddev->bitmap->file) { 4675 file->pathname[0] = '\0'; 4676 goto copy_out; 4677 } 4678 4679 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); 4680 if (!buf) 4681 goto out; 4682 4683 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); 4684 if (IS_ERR(ptr)) 4685 goto out; 4686 4687 strcpy(file->pathname, ptr); 4688 4689 copy_out: 4690 err = 0; 4691 if (copy_to_user(arg, file, sizeof(*file))) 4692 err = -EFAULT; 4693 out: 4694 kfree(buf); 4695 kfree(file); 4696 return err; 4697 } 4698 4699 static int get_disk_info(mddev_t * mddev, void __user * arg) 4700 { 4701 mdu_disk_info_t info; 4702 mdk_rdev_t *rdev; 4703 4704 if (copy_from_user(&info, arg, sizeof(info))) 4705 return -EFAULT; 4706 4707 rdev = find_rdev_nr(mddev, info.number); 4708 if (rdev) { 4709 info.major = MAJOR(rdev->bdev->bd_dev); 4710 info.minor = MINOR(rdev->bdev->bd_dev); 4711 info.raid_disk = rdev->raid_disk; 4712 info.state = 0; 4713 if (test_bit(Faulty, &rdev->flags)) 4714 info.state |= (1<<MD_DISK_FAULTY); 4715 else if (test_bit(In_sync, &rdev->flags)) { 4716 info.state |= (1<<MD_DISK_ACTIVE); 4717 info.state |= (1<<MD_DISK_SYNC); 4718 } 4719 if (test_bit(WriteMostly, &rdev->flags)) 4720 info.state |= (1<<MD_DISK_WRITEMOSTLY); 4721 } else { 4722 info.major = info.minor = 0; 4723 info.raid_disk = -1; 4724 info.state = (1<<MD_DISK_REMOVED); 4725 } 4726 4727 if (copy_to_user(arg, &info, sizeof(info))) 4728 return -EFAULT; 4729 4730 return 0; 4731 } 4732 4733 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) 4734 { 4735 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; 4736 mdk_rdev_t *rdev; 4737 dev_t dev = MKDEV(info->major,info->minor); 4738 4739 if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) 4740 return -EOVERFLOW; 4741 4742 if (!mddev->raid_disks) { 4743 int err; 4744 /* expecting a device which has a superblock */ 4745 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); 4746 if (IS_ERR(rdev)) { 4747 printk(KERN_WARNING 4748 "md: md_import_device returned %ld\n", 4749 PTR_ERR(rdev)); 4750 return PTR_ERR(rdev); 4751 } 4752 if (!list_empty(&mddev->disks)) { 4753 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, 4754 mdk_rdev_t, same_set); 4755 err = super_types[mddev->major_version] 4756 .load_super(rdev, rdev0, mddev->minor_version); 4757 if (err < 0) { 4758 printk(KERN_WARNING 4759 "md: %s has different UUID to %s\n", 4760 bdevname(rdev->bdev,b), 4761 bdevname(rdev0->bdev,b2)); 4762 export_rdev(rdev); 4763 return -EINVAL; 4764 } 4765 } 4766 err = bind_rdev_to_array(rdev, mddev); 4767 if (err) 4768 export_rdev(rdev); 4769 return err; 4770 } 4771 4772 /* 4773 * add_new_disk can be used once the array is assembled 4774 * to add "hot spares". They must already have a superblock 4775 * written 4776 */ 4777 if (mddev->pers) { 4778 int err; 4779 if (!mddev->pers->hot_add_disk) { 4780 printk(KERN_WARNING 4781 "%s: personality does not support diskops!\n", 4782 mdname(mddev)); 4783 return -EINVAL; 4784 } 4785 if (mddev->persistent) 4786 rdev = md_import_device(dev, mddev->major_version, 4787 mddev->minor_version); 4788 else 4789 rdev = md_import_device(dev, -1, -1); 4790 if (IS_ERR(rdev)) { 4791 printk(KERN_WARNING 4792 "md: md_import_device returned %ld\n", 4793 PTR_ERR(rdev)); 4794 return PTR_ERR(rdev); 4795 } 4796 /* set save_raid_disk if appropriate */ 4797 if (!mddev->persistent) { 4798 if (info->state & (1<<MD_DISK_SYNC) && 4799 info->raid_disk < mddev->raid_disks) 4800 rdev->raid_disk = info->raid_disk; 4801 else 4802 rdev->raid_disk = -1; 4803 } else 4804 super_types[mddev->major_version]. 4805 validate_super(mddev, rdev); 4806 rdev->saved_raid_disk = rdev->raid_disk; 4807 4808 clear_bit(In_sync, &rdev->flags); /* just to be sure */ 4809 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 4810 set_bit(WriteMostly, &rdev->flags); 4811 else 4812 clear_bit(WriteMostly, &rdev->flags); 4813 4814 rdev->raid_disk = -1; 4815 err = bind_rdev_to_array(rdev, mddev); 4816 if (!err && !mddev->pers->hot_remove_disk) { 4817 /* If there is hot_add_disk but no hot_remove_disk 4818 * then added disks for geometry changes, 4819 * and should be added immediately. 4820 */ 4821 super_types[mddev->major_version]. 4822 validate_super(mddev, rdev); 4823 err = mddev->pers->hot_add_disk(mddev, rdev); 4824 if (err) 4825 unbind_rdev_from_array(rdev); 4826 } 4827 if (err) 4828 export_rdev(rdev); 4829 else 4830 sysfs_notify_dirent(rdev->sysfs_state); 4831 4832 md_update_sb(mddev, 1); 4833 if (mddev->degraded) 4834 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 4835 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4836 md_wakeup_thread(mddev->thread); 4837 return err; 4838 } 4839 4840 /* otherwise, add_new_disk is only allowed 4841 * for major_version==0 superblocks 4842 */ 4843 if (mddev->major_version != 0) { 4844 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", 4845 mdname(mddev)); 4846 return -EINVAL; 4847 } 4848 4849 if (!(info->state & (1<<MD_DISK_FAULTY))) { 4850 int err; 4851 rdev = md_import_device(dev, -1, 0); 4852 if (IS_ERR(rdev)) { 4853 printk(KERN_WARNING 4854 "md: error, md_import_device() returned %ld\n", 4855 PTR_ERR(rdev)); 4856 return PTR_ERR(rdev); 4857 } 4858 rdev->desc_nr = info->number; 4859 if (info->raid_disk < mddev->raid_disks) 4860 rdev->raid_disk = info->raid_disk; 4861 else 4862 rdev->raid_disk = -1; 4863 4864 if (rdev->raid_disk < mddev->raid_disks) 4865 if (info->state & (1<<MD_DISK_SYNC)) 4866 set_bit(In_sync, &rdev->flags); 4867 4868 if (info->state & (1<<MD_DISK_WRITEMOSTLY)) 4869 set_bit(WriteMostly, &rdev->flags); 4870 4871 if (!mddev->persistent) { 4872 printk(KERN_INFO "md: nonpersistent superblock ...\n"); 4873 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; 4874 } else 4875 rdev->sb_start = calc_dev_sboffset(rdev->bdev); 4876 rdev->sectors = rdev->sb_start; 4877 4878 err = bind_rdev_to_array(rdev, mddev); 4879 if (err) { 4880 export_rdev(rdev); 4881 return err; 4882 } 4883 } 4884 4885 return 0; 4886 } 4887 4888 static int hot_remove_disk(mddev_t * mddev, dev_t dev) 4889 { 4890 char b[BDEVNAME_SIZE]; 4891 mdk_rdev_t *rdev; 4892 4893 rdev = find_rdev(mddev, dev); 4894 if (!rdev) 4895 return -ENXIO; 4896 4897 if (rdev->raid_disk >= 0) 4898 goto busy; 4899 4900 kick_rdev_from_array(rdev); 4901 md_update_sb(mddev, 1); 4902 md_new_event(mddev); 4903 4904 return 0; 4905 busy: 4906 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", 4907 bdevname(rdev->bdev,b), mdname(mddev)); 4908 return -EBUSY; 4909 } 4910 4911 static int hot_add_disk(mddev_t * mddev, dev_t dev) 4912 { 4913 char b[BDEVNAME_SIZE]; 4914 int err; 4915 mdk_rdev_t *rdev; 4916 4917 if (!mddev->pers) 4918 return -ENODEV; 4919 4920 if (mddev->major_version != 0) { 4921 printk(KERN_WARNING "%s: HOT_ADD may only be used with" 4922 " version-0 superblocks.\n", 4923 mdname(mddev)); 4924 return -EINVAL; 4925 } 4926 if (!mddev->pers->hot_add_disk) { 4927 printk(KERN_WARNING 4928 "%s: personality does not support diskops!\n", 4929 mdname(mddev)); 4930 return -EINVAL; 4931 } 4932 4933 rdev = md_import_device(dev, -1, 0); 4934 if (IS_ERR(rdev)) { 4935 printk(KERN_WARNING 4936 "md: error, md_import_device() returned %ld\n", 4937 PTR_ERR(rdev)); 4938 return -EINVAL; 4939 } 4940 4941 if (mddev->persistent) 4942 rdev->sb_start = calc_dev_sboffset(rdev->bdev); 4943 else 4944 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; 4945 4946 rdev->sectors = rdev->sb_start; 4947 4948 if (test_bit(Faulty, &rdev->flags)) { 4949 printk(KERN_WARNING 4950 "md: can not hot-add faulty %s disk to %s!\n", 4951 bdevname(rdev->bdev,b), mdname(mddev)); 4952 err = -EINVAL; 4953 goto abort_export; 4954 } 4955 clear_bit(In_sync, &rdev->flags); 4956 rdev->desc_nr = -1; 4957 rdev->saved_raid_disk = -1; 4958 err = bind_rdev_to_array(rdev, mddev); 4959 if (err) 4960 goto abort_export; 4961 4962 /* 4963 * The rest should better be atomic, we can have disk failures 4964 * noticed in interrupt contexts ... 4965 */ 4966 4967 rdev->raid_disk = -1; 4968 4969 md_update_sb(mddev, 1); 4970 4971 /* 4972 * Kick recovery, maybe this spare has to be added to the 4973 * array immediately. 4974 */ 4975 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 4976 md_wakeup_thread(mddev->thread); 4977 md_new_event(mddev); 4978 return 0; 4979 4980 abort_export: 4981 export_rdev(rdev); 4982 return err; 4983 } 4984 4985 static int set_bitmap_file(mddev_t *mddev, int fd) 4986 { 4987 int err; 4988 4989 if (mddev->pers) { 4990 if (!mddev->pers->quiesce) 4991 return -EBUSY; 4992 if (mddev->recovery || mddev->sync_thread) 4993 return -EBUSY; 4994 /* we should be able to change the bitmap.. */ 4995 } 4996 4997 4998 if (fd >= 0) { 4999 if (mddev->bitmap) 5000 return -EEXIST; /* cannot add when bitmap is present */ 5001 mddev->bitmap_file = fget(fd); 5002 5003 if (mddev->bitmap_file == NULL) { 5004 printk(KERN_ERR "%s: error: failed to get bitmap file\n", 5005 mdname(mddev)); 5006 return -EBADF; 5007 } 5008 5009 err = deny_bitmap_write_access(mddev->bitmap_file); 5010 if (err) { 5011 printk(KERN_ERR "%s: error: bitmap file is already in use\n", 5012 mdname(mddev)); 5013 fput(mddev->bitmap_file); 5014 mddev->bitmap_file = NULL; 5015 return err; 5016 } 5017 mddev->bitmap_offset = 0; /* file overrides offset */ 5018 } else if (mddev->bitmap == NULL) 5019 return -ENOENT; /* cannot remove what isn't there */ 5020 err = 0; 5021 if (mddev->pers) { 5022 mddev->pers->quiesce(mddev, 1); 5023 if (fd >= 0) 5024 err = bitmap_create(mddev); 5025 if (fd < 0 || err) { 5026 bitmap_destroy(mddev); 5027 fd = -1; /* make sure to put the file */ 5028 } 5029 mddev->pers->quiesce(mddev, 0); 5030 } 5031 if (fd < 0) { 5032 if (mddev->bitmap_file) { 5033 restore_bitmap_write_access(mddev->bitmap_file); 5034 fput(mddev->bitmap_file); 5035 } 5036 mddev->bitmap_file = NULL; 5037 } 5038 5039 return err; 5040 } 5041 5042 /* 5043 * set_array_info is used two different ways 5044 * The original usage is when creating a new array. 5045 * In this usage, raid_disks is > 0 and it together with 5046 * level, size, not_persistent,layout,chunksize determine the 5047 * shape of the array. 5048 * This will always create an array with a type-0.90.0 superblock. 5049 * The newer usage is when assembling an array. 5050 * In this case raid_disks will be 0, and the major_version field is 5051 * use to determine which style super-blocks are to be found on the devices. 5052 * The minor and patch _version numbers are also kept incase the 5053 * super_block handler wishes to interpret them. 5054 */ 5055 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) 5056 { 5057 5058 if (info->raid_disks == 0) { 5059 /* just setting version number for superblock loading */ 5060 if (info->major_version < 0 || 5061 info->major_version >= ARRAY_SIZE(super_types) || 5062 super_types[info->major_version].name == NULL) { 5063 /* maybe try to auto-load a module? */ 5064 printk(KERN_INFO 5065 "md: superblock version %d not known\n", 5066 info->major_version); 5067 return -EINVAL; 5068 } 5069 mddev->major_version = info->major_version; 5070 mddev->minor_version = info->minor_version; 5071 mddev->patch_version = info->patch_version; 5072 mddev->persistent = !info->not_persistent; 5073 return 0; 5074 } 5075 mddev->major_version = MD_MAJOR_VERSION; 5076 mddev->minor_version = MD_MINOR_VERSION; 5077 mddev->patch_version = MD_PATCHLEVEL_VERSION; 5078 mddev->ctime = get_seconds(); 5079 5080 mddev->level = info->level; 5081 mddev->clevel[0] = 0; 5082 mddev->dev_sectors = 2 * (sector_t)info->size; 5083 mddev->raid_disks = info->raid_disks; 5084 /* don't set md_minor, it is determined by which /dev/md* was 5085 * openned 5086 */ 5087 if (info->state & (1<<MD_SB_CLEAN)) 5088 mddev->recovery_cp = MaxSector; 5089 else 5090 mddev->recovery_cp = 0; 5091 mddev->persistent = ! info->not_persistent; 5092 mddev->external = 0; 5093 5094 mddev->layout = info->layout; 5095 mddev->chunk_sectors = info->chunk_size >> 9; 5096 5097 mddev->max_disks = MD_SB_DISKS; 5098 5099 if (mddev->persistent) 5100 mddev->flags = 0; 5101 set_bit(MD_CHANGE_DEVS, &mddev->flags); 5102 5103 mddev->default_bitmap_offset = MD_SB_BYTES >> 9; 5104 mddev->bitmap_offset = 0; 5105 5106 mddev->reshape_position = MaxSector; 5107 5108 /* 5109 * Generate a 128 bit UUID 5110 */ 5111 get_random_bytes(mddev->uuid, 16); 5112 5113 mddev->new_level = mddev->level; 5114 mddev->new_chunk_sectors = mddev->chunk_sectors; 5115 mddev->new_layout = mddev->layout; 5116 mddev->delta_disks = 0; 5117 5118 return 0; 5119 } 5120 5121 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) 5122 { 5123 WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); 5124 5125 if (mddev->external_size) 5126 return; 5127 5128 mddev->array_sectors = array_sectors; 5129 } 5130 EXPORT_SYMBOL(md_set_array_sectors); 5131 5132 static int update_size(mddev_t *mddev, sector_t num_sectors) 5133 { 5134 mdk_rdev_t *rdev; 5135 int rv; 5136 int fit = (num_sectors == 0); 5137 5138 if (mddev->pers->resize == NULL) 5139 return -EINVAL; 5140 /* The "num_sectors" is the number of sectors of each device that 5141 * is used. This can only make sense for arrays with redundancy. 5142 * linear and raid0 always use whatever space is available. We can only 5143 * consider changing this number if no resync or reconstruction is 5144 * happening, and if the new size is acceptable. It must fit before the 5145 * sb_start or, if that is <data_offset, it must fit before the size 5146 * of each device. If num_sectors is zero, we find the largest size 5147 * that fits. 5148 5149 */ 5150 if (mddev->sync_thread) 5151 return -EBUSY; 5152 if (mddev->bitmap) 5153 /* Sorry, cannot grow a bitmap yet, just remove it, 5154 * grow, and re-add. 5155 */ 5156 return -EBUSY; 5157 list_for_each_entry(rdev, &mddev->disks, same_set) { 5158 sector_t avail = rdev->sectors; 5159 5160 if (fit && (num_sectors == 0 || num_sectors > avail)) 5161 num_sectors = avail; 5162 if (avail < num_sectors) 5163 return -ENOSPC; 5164 } 5165 rv = mddev->pers->resize(mddev, num_sectors); 5166 if (!rv) 5167 revalidate_disk(mddev->gendisk); 5168 return rv; 5169 } 5170 5171 static int update_raid_disks(mddev_t *mddev, int raid_disks) 5172 { 5173 int rv; 5174 /* change the number of raid disks */ 5175 if (mddev->pers->check_reshape == NULL) 5176 return -EINVAL; 5177 if (raid_disks <= 0 || 5178 raid_disks >= mddev->max_disks) 5179 return -EINVAL; 5180 if (mddev->sync_thread || mddev->reshape_position != MaxSector) 5181 return -EBUSY; 5182 mddev->delta_disks = raid_disks - mddev->raid_disks; 5183 5184 rv = mddev->pers->check_reshape(mddev); 5185 return rv; 5186 } 5187 5188 5189 /* 5190 * update_array_info is used to change the configuration of an 5191 * on-line array. 5192 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size 5193 * fields in the info are checked against the array. 5194 * Any differences that cannot be handled will cause an error. 5195 * Normally, only one change can be managed at a time. 5196 */ 5197 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) 5198 { 5199 int rv = 0; 5200 int cnt = 0; 5201 int state = 0; 5202 5203 /* calculate expected state,ignoring low bits */ 5204 if (mddev->bitmap && mddev->bitmap_offset) 5205 state |= (1 << MD_SB_BITMAP_PRESENT); 5206 5207 if (mddev->major_version != info->major_version || 5208 mddev->minor_version != info->minor_version || 5209 /* mddev->patch_version != info->patch_version || */ 5210 mddev->ctime != info->ctime || 5211 mddev->level != info->level || 5212 /* mddev->layout != info->layout || */ 5213 !mddev->persistent != info->not_persistent|| 5214 mddev->chunk_sectors != info->chunk_size >> 9 || 5215 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ 5216 ((state^info->state) & 0xfffffe00) 5217 ) 5218 return -EINVAL; 5219 /* Check there is only one change */ 5220 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 5221 cnt++; 5222 if (mddev->raid_disks != info->raid_disks) 5223 cnt++; 5224 if (mddev->layout != info->layout) 5225 cnt++; 5226 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) 5227 cnt++; 5228 if (cnt == 0) 5229 return 0; 5230 if (cnt > 1) 5231 return -EINVAL; 5232 5233 if (mddev->layout != info->layout) { 5234 /* Change layout 5235 * we don't need to do anything at the md level, the 5236 * personality will take care of it all. 5237 */ 5238 if (mddev->pers->check_reshape == NULL) 5239 return -EINVAL; 5240 else { 5241 mddev->new_layout = info->layout; 5242 rv = mddev->pers->check_reshape(mddev); 5243 if (rv) 5244 mddev->new_layout = mddev->layout; 5245 return rv; 5246 } 5247 } 5248 if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) 5249 rv = update_size(mddev, (sector_t)info->size * 2); 5250 5251 if (mddev->raid_disks != info->raid_disks) 5252 rv = update_raid_disks(mddev, info->raid_disks); 5253 5254 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { 5255 if (mddev->pers->quiesce == NULL) 5256 return -EINVAL; 5257 if (mddev->recovery || mddev->sync_thread) 5258 return -EBUSY; 5259 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { 5260 /* add the bitmap */ 5261 if (mddev->bitmap) 5262 return -EEXIST; 5263 if (mddev->default_bitmap_offset == 0) 5264 return -EINVAL; 5265 mddev->bitmap_offset = mddev->default_bitmap_offset; 5266 mddev->pers->quiesce(mddev, 1); 5267 rv = bitmap_create(mddev); 5268 if (rv) 5269 bitmap_destroy(mddev); 5270 mddev->pers->quiesce(mddev, 0); 5271 } else { 5272 /* remove the bitmap */ 5273 if (!mddev->bitmap) 5274 return -ENOENT; 5275 if (mddev->bitmap->file) 5276 return -EINVAL; 5277 mddev->pers->quiesce(mddev, 1); 5278 bitmap_destroy(mddev); 5279 mddev->pers->quiesce(mddev, 0); 5280 mddev->bitmap_offset = 0; 5281 } 5282 } 5283 md_update_sb(mddev, 1); 5284 return rv; 5285 } 5286 5287 static int set_disk_faulty(mddev_t *mddev, dev_t dev) 5288 { 5289 mdk_rdev_t *rdev; 5290 5291 if (mddev->pers == NULL) 5292 return -ENODEV; 5293 5294 rdev = find_rdev(mddev, dev); 5295 if (!rdev) 5296 return -ENODEV; 5297 5298 md_error(mddev, rdev); 5299 return 0; 5300 } 5301 5302 /* 5303 * We have a problem here : there is no easy way to give a CHS 5304 * virtual geometry. We currently pretend that we have a 2 heads 5305 * 4 sectors (with a BIG number of cylinders...). This drives 5306 * dosfs just mad... ;-) 5307 */ 5308 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) 5309 { 5310 mddev_t *mddev = bdev->bd_disk->private_data; 5311 5312 geo->heads = 2; 5313 geo->sectors = 4; 5314 geo->cylinders = get_capacity(mddev->gendisk) / 8; 5315 return 0; 5316 } 5317 5318 static int md_ioctl(struct block_device *bdev, fmode_t mode, 5319 unsigned int cmd, unsigned long arg) 5320 { 5321 int err = 0; 5322 void __user *argp = (void __user *)arg; 5323 mddev_t *mddev = NULL; 5324 5325 if (!capable(CAP_SYS_ADMIN)) 5326 return -EACCES; 5327 5328 /* 5329 * Commands dealing with the RAID driver but not any 5330 * particular array: 5331 */ 5332 switch (cmd) 5333 { 5334 case RAID_VERSION: 5335 err = get_version(argp); 5336 goto done; 5337 5338 case PRINT_RAID_DEBUG: 5339 err = 0; 5340 md_print_devices(); 5341 goto done; 5342 5343 #ifndef MODULE 5344 case RAID_AUTORUN: 5345 err = 0; 5346 autostart_arrays(arg); 5347 goto done; 5348 #endif 5349 default:; 5350 } 5351 5352 /* 5353 * Commands creating/starting a new array: 5354 */ 5355 5356 mddev = bdev->bd_disk->private_data; 5357 5358 if (!mddev) { 5359 BUG(); 5360 goto abort; 5361 } 5362 5363 err = mddev_lock(mddev); 5364 if (err) { 5365 printk(KERN_INFO 5366 "md: ioctl lock interrupted, reason %d, cmd %d\n", 5367 err, cmd); 5368 goto abort; 5369 } 5370 5371 switch (cmd) 5372 { 5373 case SET_ARRAY_INFO: 5374 { 5375 mdu_array_info_t info; 5376 if (!arg) 5377 memset(&info, 0, sizeof(info)); 5378 else if (copy_from_user(&info, argp, sizeof(info))) { 5379 err = -EFAULT; 5380 goto abort_unlock; 5381 } 5382 if (mddev->pers) { 5383 err = update_array_info(mddev, &info); 5384 if (err) { 5385 printk(KERN_WARNING "md: couldn't update" 5386 " array info. %d\n", err); 5387 goto abort_unlock; 5388 } 5389 goto done_unlock; 5390 } 5391 if (!list_empty(&mddev->disks)) { 5392 printk(KERN_WARNING 5393 "md: array %s already has disks!\n", 5394 mdname(mddev)); 5395 err = -EBUSY; 5396 goto abort_unlock; 5397 } 5398 if (mddev->raid_disks) { 5399 printk(KERN_WARNING 5400 "md: array %s already initialised!\n", 5401 mdname(mddev)); 5402 err = -EBUSY; 5403 goto abort_unlock; 5404 } 5405 err = set_array_info(mddev, &info); 5406 if (err) { 5407 printk(KERN_WARNING "md: couldn't set" 5408 " array info. %d\n", err); 5409 goto abort_unlock; 5410 } 5411 } 5412 goto done_unlock; 5413 5414 default:; 5415 } 5416 5417 /* 5418 * Commands querying/configuring an existing array: 5419 */ 5420 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, 5421 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ 5422 if ((!mddev->raid_disks && !mddev->external) 5423 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY 5424 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE 5425 && cmd != GET_BITMAP_FILE) { 5426 err = -ENODEV; 5427 goto abort_unlock; 5428 } 5429 5430 /* 5431 * Commands even a read-only array can execute: 5432 */ 5433 switch (cmd) 5434 { 5435 case GET_ARRAY_INFO: 5436 err = get_array_info(mddev, argp); 5437 goto done_unlock; 5438 5439 case GET_BITMAP_FILE: 5440 err = get_bitmap_file(mddev, argp); 5441 goto done_unlock; 5442 5443 case GET_DISK_INFO: 5444 err = get_disk_info(mddev, argp); 5445 goto done_unlock; 5446 5447 case RESTART_ARRAY_RW: 5448 err = restart_array(mddev); 5449 goto done_unlock; 5450 5451 case STOP_ARRAY: 5452 err = do_md_stop(mddev, 0, 1); 5453 goto done_unlock; 5454 5455 case STOP_ARRAY_RO: 5456 err = do_md_stop(mddev, 1, 1); 5457 goto done_unlock; 5458 5459 } 5460 5461 /* 5462 * The remaining ioctls are changing the state of the 5463 * superblock, so we do not allow them on read-only arrays. 5464 * However non-MD ioctls (e.g. get-size) will still come through 5465 * here and hit the 'default' below, so only disallow 5466 * 'md' ioctls, and switch to rw mode if started auto-readonly. 5467 */ 5468 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { 5469 if (mddev->ro == 2) { 5470 mddev->ro = 0; 5471 sysfs_notify_dirent(mddev->sysfs_state); 5472 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5473 md_wakeup_thread(mddev->thread); 5474 } else { 5475 err = -EROFS; 5476 goto abort_unlock; 5477 } 5478 } 5479 5480 switch (cmd) 5481 { 5482 case ADD_NEW_DISK: 5483 { 5484 mdu_disk_info_t info; 5485 if (copy_from_user(&info, argp, sizeof(info))) 5486 err = -EFAULT; 5487 else 5488 err = add_new_disk(mddev, &info); 5489 goto done_unlock; 5490 } 5491 5492 case HOT_REMOVE_DISK: 5493 err = hot_remove_disk(mddev, new_decode_dev(arg)); 5494 goto done_unlock; 5495 5496 case HOT_ADD_DISK: 5497 err = hot_add_disk(mddev, new_decode_dev(arg)); 5498 goto done_unlock; 5499 5500 case SET_DISK_FAULTY: 5501 err = set_disk_faulty(mddev, new_decode_dev(arg)); 5502 goto done_unlock; 5503 5504 case RUN_ARRAY: 5505 err = do_md_run(mddev); 5506 goto done_unlock; 5507 5508 case SET_BITMAP_FILE: 5509 err = set_bitmap_file(mddev, (int)arg); 5510 goto done_unlock; 5511 5512 default: 5513 err = -EINVAL; 5514 goto abort_unlock; 5515 } 5516 5517 done_unlock: 5518 abort_unlock: 5519 if (mddev->hold_active == UNTIL_IOCTL && 5520 err != -EINVAL) 5521 mddev->hold_active = 0; 5522 mddev_unlock(mddev); 5523 5524 return err; 5525 done: 5526 if (err) 5527 MD_BUG(); 5528 abort: 5529 return err; 5530 } 5531 5532 static int md_open(struct block_device *bdev, fmode_t mode) 5533 { 5534 /* 5535 * Succeed if we can lock the mddev, which confirms that 5536 * it isn't being stopped right now. 5537 */ 5538 mddev_t *mddev = mddev_find(bdev->bd_dev); 5539 int err; 5540 5541 if (mddev->gendisk != bdev->bd_disk) { 5542 /* we are racing with mddev_put which is discarding this 5543 * bd_disk. 5544 */ 5545 mddev_put(mddev); 5546 /* Wait until bdev->bd_disk is definitely gone */ 5547 flush_scheduled_work(); 5548 /* Then retry the open from the top */ 5549 return -ERESTARTSYS; 5550 } 5551 BUG_ON(mddev != bdev->bd_disk->private_data); 5552 5553 if ((err = mutex_lock_interruptible(&mddev->open_mutex))) 5554 goto out; 5555 5556 err = 0; 5557 atomic_inc(&mddev->openers); 5558 mutex_unlock(&mddev->open_mutex); 5559 5560 check_disk_change(bdev); 5561 out: 5562 return err; 5563 } 5564 5565 static int md_release(struct gendisk *disk, fmode_t mode) 5566 { 5567 mddev_t *mddev = disk->private_data; 5568 5569 BUG_ON(!mddev); 5570 atomic_dec(&mddev->openers); 5571 mddev_put(mddev); 5572 5573 return 0; 5574 } 5575 5576 static int md_media_changed(struct gendisk *disk) 5577 { 5578 mddev_t *mddev = disk->private_data; 5579 5580 return mddev->changed; 5581 } 5582 5583 static int md_revalidate(struct gendisk *disk) 5584 { 5585 mddev_t *mddev = disk->private_data; 5586 5587 mddev->changed = 0; 5588 return 0; 5589 } 5590 static const struct block_device_operations md_fops = 5591 { 5592 .owner = THIS_MODULE, 5593 .open = md_open, 5594 .release = md_release, 5595 .ioctl = md_ioctl, 5596 .getgeo = md_getgeo, 5597 .media_changed = md_media_changed, 5598 .revalidate_disk= md_revalidate, 5599 }; 5600 5601 static int md_thread(void * arg) 5602 { 5603 mdk_thread_t *thread = arg; 5604 5605 /* 5606 * md_thread is a 'system-thread', it's priority should be very 5607 * high. We avoid resource deadlocks individually in each 5608 * raid personality. (RAID5 does preallocation) We also use RR and 5609 * the very same RT priority as kswapd, thus we will never get 5610 * into a priority inversion deadlock. 5611 * 5612 * we definitely have to have equal or higher priority than 5613 * bdflush, otherwise bdflush will deadlock if there are too 5614 * many dirty RAID5 blocks. 5615 */ 5616 5617 allow_signal(SIGKILL); 5618 while (!kthread_should_stop()) { 5619 5620 /* We need to wait INTERRUPTIBLE so that 5621 * we don't add to the load-average. 5622 * That means we need to be sure no signals are 5623 * pending 5624 */ 5625 if (signal_pending(current)) 5626 flush_signals(current); 5627 5628 wait_event_interruptible_timeout 5629 (thread->wqueue, 5630 test_bit(THREAD_WAKEUP, &thread->flags) 5631 || kthread_should_stop(), 5632 thread->timeout); 5633 5634 clear_bit(THREAD_WAKEUP, &thread->flags); 5635 5636 thread->run(thread->mddev); 5637 } 5638 5639 return 0; 5640 } 5641 5642 void md_wakeup_thread(mdk_thread_t *thread) 5643 { 5644 if (thread) { 5645 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); 5646 set_bit(THREAD_WAKEUP, &thread->flags); 5647 wake_up(&thread->wqueue); 5648 } 5649 } 5650 5651 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, 5652 const char *name) 5653 { 5654 mdk_thread_t *thread; 5655 5656 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); 5657 if (!thread) 5658 return NULL; 5659 5660 init_waitqueue_head(&thread->wqueue); 5661 5662 thread->run = run; 5663 thread->mddev = mddev; 5664 thread->timeout = MAX_SCHEDULE_TIMEOUT; 5665 thread->tsk = kthread_run(md_thread, thread, 5666 "%s_%s", 5667 mdname(thread->mddev), 5668 name ?: mddev->pers->name); 5669 if (IS_ERR(thread->tsk)) { 5670 kfree(thread); 5671 return NULL; 5672 } 5673 return thread; 5674 } 5675 5676 void md_unregister_thread(mdk_thread_t *thread) 5677 { 5678 if (!thread) 5679 return; 5680 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); 5681 5682 kthread_stop(thread->tsk); 5683 kfree(thread); 5684 } 5685 5686 void md_error(mddev_t *mddev, mdk_rdev_t *rdev) 5687 { 5688 if (!mddev) { 5689 MD_BUG(); 5690 return; 5691 } 5692 5693 if (!rdev || test_bit(Faulty, &rdev->flags)) 5694 return; 5695 5696 if (mddev->external) 5697 set_bit(Blocked, &rdev->flags); 5698 /* 5699 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", 5700 mdname(mddev), 5701 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), 5702 __builtin_return_address(0),__builtin_return_address(1), 5703 __builtin_return_address(2),__builtin_return_address(3)); 5704 */ 5705 if (!mddev->pers) 5706 return; 5707 if (!mddev->pers->error_handler) 5708 return; 5709 mddev->pers->error_handler(mddev,rdev); 5710 if (mddev->degraded) 5711 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 5712 set_bit(StateChanged, &rdev->flags); 5713 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 5714 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 5715 md_wakeup_thread(mddev->thread); 5716 md_new_event_inintr(mddev); 5717 } 5718 5719 /* seq_file implementation /proc/mdstat */ 5720 5721 static void status_unused(struct seq_file *seq) 5722 { 5723 int i = 0; 5724 mdk_rdev_t *rdev; 5725 5726 seq_printf(seq, "unused devices: "); 5727 5728 list_for_each_entry(rdev, &pending_raid_disks, same_set) { 5729 char b[BDEVNAME_SIZE]; 5730 i++; 5731 seq_printf(seq, "%s ", 5732 bdevname(rdev->bdev,b)); 5733 } 5734 if (!i) 5735 seq_printf(seq, "<none>"); 5736 5737 seq_printf(seq, "\n"); 5738 } 5739 5740 5741 static void status_resync(struct seq_file *seq, mddev_t * mddev) 5742 { 5743 sector_t max_sectors, resync, res; 5744 unsigned long dt, db; 5745 sector_t rt; 5746 int scale; 5747 unsigned int per_milli; 5748 5749 resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); 5750 5751 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 5752 max_sectors = mddev->resync_max_sectors; 5753 else 5754 max_sectors = mddev->dev_sectors; 5755 5756 /* 5757 * Should not happen. 5758 */ 5759 if (!max_sectors) { 5760 MD_BUG(); 5761 return; 5762 } 5763 /* Pick 'scale' such that (resync>>scale)*1000 will fit 5764 * in a sector_t, and (max_sectors>>scale) will fit in a 5765 * u32, as those are the requirements for sector_div. 5766 * Thus 'scale' must be at least 10 5767 */ 5768 scale = 10; 5769 if (sizeof(sector_t) > sizeof(unsigned long)) { 5770 while ( max_sectors/2 > (1ULL<<(scale+32))) 5771 scale++; 5772 } 5773 res = (resync>>scale)*1000; 5774 sector_div(res, (u32)((max_sectors>>scale)+1)); 5775 5776 per_milli = res; 5777 { 5778 int i, x = per_milli/50, y = 20-x; 5779 seq_printf(seq, "["); 5780 for (i = 0; i < x; i++) 5781 seq_printf(seq, "="); 5782 seq_printf(seq, ">"); 5783 for (i = 0; i < y; i++) 5784 seq_printf(seq, "."); 5785 seq_printf(seq, "] "); 5786 } 5787 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", 5788 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? 5789 "reshape" : 5790 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? 5791 "check" : 5792 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? 5793 "resync" : "recovery"))), 5794 per_milli/10, per_milli % 10, 5795 (unsigned long long) resync/2, 5796 (unsigned long long) max_sectors/2); 5797 5798 /* 5799 * dt: time from mark until now 5800 * db: blocks written from mark until now 5801 * rt: remaining time 5802 * 5803 * rt is a sector_t, so could be 32bit or 64bit. 5804 * So we divide before multiply in case it is 32bit and close 5805 * to the limit. 5806 * We scale the divisor (db) by 32 to avoid loosing precision 5807 * near the end of resync when the number of remaining sectors 5808 * is close to 'db'. 5809 * We then divide rt by 32 after multiplying by db to compensate. 5810 * The '+1' avoids division by zero if db is very small. 5811 */ 5812 dt = ((jiffies - mddev->resync_mark) / HZ); 5813 if (!dt) dt++; 5814 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) 5815 - mddev->resync_mark_cnt; 5816 5817 rt = max_sectors - resync; /* number of remaining sectors */ 5818 sector_div(rt, db/32+1); 5819 rt *= dt; 5820 rt >>= 5; 5821 5822 seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, 5823 ((unsigned long)rt % 60)/6); 5824 5825 seq_printf(seq, " speed=%ldK/sec", db/2/dt); 5826 } 5827 5828 static void *md_seq_start(struct seq_file *seq, loff_t *pos) 5829 { 5830 struct list_head *tmp; 5831 loff_t l = *pos; 5832 mddev_t *mddev; 5833 5834 if (l >= 0x10000) 5835 return NULL; 5836 if (!l--) 5837 /* header */ 5838 return (void*)1; 5839 5840 spin_lock(&all_mddevs_lock); 5841 list_for_each(tmp,&all_mddevs) 5842 if (!l--) { 5843 mddev = list_entry(tmp, mddev_t, all_mddevs); 5844 mddev_get(mddev); 5845 spin_unlock(&all_mddevs_lock); 5846 return mddev; 5847 } 5848 spin_unlock(&all_mddevs_lock); 5849 if (!l--) 5850 return (void*)2;/* tail */ 5851 return NULL; 5852 } 5853 5854 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) 5855 { 5856 struct list_head *tmp; 5857 mddev_t *next_mddev, *mddev = v; 5858 5859 ++*pos; 5860 if (v == (void*)2) 5861 return NULL; 5862 5863 spin_lock(&all_mddevs_lock); 5864 if (v == (void*)1) 5865 tmp = all_mddevs.next; 5866 else 5867 tmp = mddev->all_mddevs.next; 5868 if (tmp != &all_mddevs) 5869 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); 5870 else { 5871 next_mddev = (void*)2; 5872 *pos = 0x10000; 5873 } 5874 spin_unlock(&all_mddevs_lock); 5875 5876 if (v != (void*)1) 5877 mddev_put(mddev); 5878 return next_mddev; 5879 5880 } 5881 5882 static void md_seq_stop(struct seq_file *seq, void *v) 5883 { 5884 mddev_t *mddev = v; 5885 5886 if (mddev && v != (void*)1 && v != (void*)2) 5887 mddev_put(mddev); 5888 } 5889 5890 struct mdstat_info { 5891 int event; 5892 }; 5893 5894 static int md_seq_show(struct seq_file *seq, void *v) 5895 { 5896 mddev_t *mddev = v; 5897 sector_t sectors; 5898 mdk_rdev_t *rdev; 5899 struct mdstat_info *mi = seq->private; 5900 struct bitmap *bitmap; 5901 5902 if (v == (void*)1) { 5903 struct mdk_personality *pers; 5904 seq_printf(seq, "Personalities : "); 5905 spin_lock(&pers_lock); 5906 list_for_each_entry(pers, &pers_list, list) 5907 seq_printf(seq, "[%s] ", pers->name); 5908 5909 spin_unlock(&pers_lock); 5910 seq_printf(seq, "\n"); 5911 mi->event = atomic_read(&md_event_count); 5912 return 0; 5913 } 5914 if (v == (void*)2) { 5915 status_unused(seq); 5916 return 0; 5917 } 5918 5919 if (mddev_lock(mddev) < 0) 5920 return -EINTR; 5921 5922 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { 5923 seq_printf(seq, "%s : %sactive", mdname(mddev), 5924 mddev->pers ? "" : "in"); 5925 if (mddev->pers) { 5926 if (mddev->ro==1) 5927 seq_printf(seq, " (read-only)"); 5928 if (mddev->ro==2) 5929 seq_printf(seq, " (auto-read-only)"); 5930 seq_printf(seq, " %s", mddev->pers->name); 5931 } 5932 5933 sectors = 0; 5934 list_for_each_entry(rdev, &mddev->disks, same_set) { 5935 char b[BDEVNAME_SIZE]; 5936 seq_printf(seq, " %s[%d]", 5937 bdevname(rdev->bdev,b), rdev->desc_nr); 5938 if (test_bit(WriteMostly, &rdev->flags)) 5939 seq_printf(seq, "(W)"); 5940 if (test_bit(Faulty, &rdev->flags)) { 5941 seq_printf(seq, "(F)"); 5942 continue; 5943 } else if (rdev->raid_disk < 0) 5944 seq_printf(seq, "(S)"); /* spare */ 5945 sectors += rdev->sectors; 5946 } 5947 5948 if (!list_empty(&mddev->disks)) { 5949 if (mddev->pers) 5950 seq_printf(seq, "\n %llu blocks", 5951 (unsigned long long) 5952 mddev->array_sectors / 2); 5953 else 5954 seq_printf(seq, "\n %llu blocks", 5955 (unsigned long long)sectors / 2); 5956 } 5957 if (mddev->persistent) { 5958 if (mddev->major_version != 0 || 5959 mddev->minor_version != 90) { 5960 seq_printf(seq," super %d.%d", 5961 mddev->major_version, 5962 mddev->minor_version); 5963 } 5964 } else if (mddev->external) 5965 seq_printf(seq, " super external:%s", 5966 mddev->metadata_type); 5967 else 5968 seq_printf(seq, " super non-persistent"); 5969 5970 if (mddev->pers) { 5971 mddev->pers->status(seq, mddev); 5972 seq_printf(seq, "\n "); 5973 if (mddev->pers->sync_request) { 5974 if (mddev->curr_resync > 2) { 5975 status_resync(seq, mddev); 5976 seq_printf(seq, "\n "); 5977 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) 5978 seq_printf(seq, "\tresync=DELAYED\n "); 5979 else if (mddev->recovery_cp < MaxSector) 5980 seq_printf(seq, "\tresync=PENDING\n "); 5981 } 5982 } else 5983 seq_printf(seq, "\n "); 5984 5985 if ((bitmap = mddev->bitmap)) { 5986 unsigned long chunk_kb; 5987 unsigned long flags; 5988 spin_lock_irqsave(&bitmap->lock, flags); 5989 chunk_kb = bitmap->chunksize >> 10; 5990 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " 5991 "%lu%s chunk", 5992 bitmap->pages - bitmap->missing_pages, 5993 bitmap->pages, 5994 (bitmap->pages - bitmap->missing_pages) 5995 << (PAGE_SHIFT - 10), 5996 chunk_kb ? chunk_kb : bitmap->chunksize, 5997 chunk_kb ? "KB" : "B"); 5998 if (bitmap->file) { 5999 seq_printf(seq, ", file: "); 6000 seq_path(seq, &bitmap->file->f_path, " \t\n"); 6001 } 6002 6003 seq_printf(seq, "\n"); 6004 spin_unlock_irqrestore(&bitmap->lock, flags); 6005 } 6006 6007 seq_printf(seq, "\n"); 6008 } 6009 mddev_unlock(mddev); 6010 6011 return 0; 6012 } 6013 6014 static const struct seq_operations md_seq_ops = { 6015 .start = md_seq_start, 6016 .next = md_seq_next, 6017 .stop = md_seq_stop, 6018 .show = md_seq_show, 6019 }; 6020 6021 static int md_seq_open(struct inode *inode, struct file *file) 6022 { 6023 int error; 6024 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); 6025 if (mi == NULL) 6026 return -ENOMEM; 6027 6028 error = seq_open(file, &md_seq_ops); 6029 if (error) 6030 kfree(mi); 6031 else { 6032 struct seq_file *p = file->private_data; 6033 p->private = mi; 6034 mi->event = atomic_read(&md_event_count); 6035 } 6036 return error; 6037 } 6038 6039 static unsigned int mdstat_poll(struct file *filp, poll_table *wait) 6040 { 6041 struct seq_file *m = filp->private_data; 6042 struct mdstat_info *mi = m->private; 6043 int mask; 6044 6045 poll_wait(filp, &md_event_waiters, wait); 6046 6047 /* always allow read */ 6048 mask = POLLIN | POLLRDNORM; 6049 6050 if (mi->event != atomic_read(&md_event_count)) 6051 mask |= POLLERR | POLLPRI; 6052 return mask; 6053 } 6054 6055 static const struct file_operations md_seq_fops = { 6056 .owner = THIS_MODULE, 6057 .open = md_seq_open, 6058 .read = seq_read, 6059 .llseek = seq_lseek, 6060 .release = seq_release_private, 6061 .poll = mdstat_poll, 6062 }; 6063 6064 int register_md_personality(struct mdk_personality *p) 6065 { 6066 spin_lock(&pers_lock); 6067 list_add_tail(&p->list, &pers_list); 6068 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); 6069 spin_unlock(&pers_lock); 6070 return 0; 6071 } 6072 6073 int unregister_md_personality(struct mdk_personality *p) 6074 { 6075 printk(KERN_INFO "md: %s personality unregistered\n", p->name); 6076 spin_lock(&pers_lock); 6077 list_del_init(&p->list); 6078 spin_unlock(&pers_lock); 6079 return 0; 6080 } 6081 6082 static int is_mddev_idle(mddev_t *mddev, int init) 6083 { 6084 mdk_rdev_t * rdev; 6085 int idle; 6086 int curr_events; 6087 6088 idle = 1; 6089 rcu_read_lock(); 6090 rdev_for_each_rcu(rdev, mddev) { 6091 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; 6092 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 6093 (int)part_stat_read(&disk->part0, sectors[1]) - 6094 atomic_read(&disk->sync_io); 6095 /* sync IO will cause sync_io to increase before the disk_stats 6096 * as sync_io is counted when a request starts, and 6097 * disk_stats is counted when it completes. 6098 * So resync activity will cause curr_events to be smaller than 6099 * when there was no such activity. 6100 * non-sync IO will cause disk_stat to increase without 6101 * increasing sync_io so curr_events will (eventually) 6102 * be larger than it was before. Once it becomes 6103 * substantially larger, the test below will cause 6104 * the array to appear non-idle, and resync will slow 6105 * down. 6106 * If there is a lot of outstanding resync activity when 6107 * we set last_event to curr_events, then all that activity 6108 * completing might cause the array to appear non-idle 6109 * and resync will be slowed down even though there might 6110 * not have been non-resync activity. This will only 6111 * happen once though. 'last_events' will soon reflect 6112 * the state where there is little or no outstanding 6113 * resync requests, and further resync activity will 6114 * always make curr_events less than last_events. 6115 * 6116 */ 6117 if (init || curr_events - rdev->last_events > 64) { 6118 rdev->last_events = curr_events; 6119 idle = 0; 6120 } 6121 } 6122 rcu_read_unlock(); 6123 return idle; 6124 } 6125 6126 void md_done_sync(mddev_t *mddev, int blocks, int ok) 6127 { 6128 /* another "blocks" (512byte) blocks have been synced */ 6129 atomic_sub(blocks, &mddev->recovery_active); 6130 wake_up(&mddev->recovery_wait); 6131 if (!ok) { 6132 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6133 md_wakeup_thread(mddev->thread); 6134 // stop recovery, signal do_sync .... 6135 } 6136 } 6137 6138 6139 /* md_write_start(mddev, bi) 6140 * If we need to update some array metadata (e.g. 'active' flag 6141 * in superblock) before writing, schedule a superblock update 6142 * and wait for it to complete. 6143 */ 6144 void md_write_start(mddev_t *mddev, struct bio *bi) 6145 { 6146 int did_change = 0; 6147 if (bio_data_dir(bi) != WRITE) 6148 return; 6149 6150 BUG_ON(mddev->ro == 1); 6151 if (mddev->ro == 2) { 6152 /* need to switch to read/write */ 6153 mddev->ro = 0; 6154 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6155 md_wakeup_thread(mddev->thread); 6156 md_wakeup_thread(mddev->sync_thread); 6157 did_change = 1; 6158 } 6159 atomic_inc(&mddev->writes_pending); 6160 if (mddev->safemode == 1) 6161 mddev->safemode = 0; 6162 if (mddev->in_sync) { 6163 spin_lock_irq(&mddev->write_lock); 6164 if (mddev->in_sync) { 6165 mddev->in_sync = 0; 6166 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 6167 md_wakeup_thread(mddev->thread); 6168 did_change = 1; 6169 } 6170 spin_unlock_irq(&mddev->write_lock); 6171 } 6172 if (did_change) 6173 sysfs_notify_dirent(mddev->sysfs_state); 6174 wait_event(mddev->sb_wait, 6175 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && 6176 !test_bit(MD_CHANGE_PENDING, &mddev->flags)); 6177 } 6178 6179 void md_write_end(mddev_t *mddev) 6180 { 6181 if (atomic_dec_and_test(&mddev->writes_pending)) { 6182 if (mddev->safemode == 2) 6183 md_wakeup_thread(mddev->thread); 6184 else if (mddev->safemode_delay) 6185 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); 6186 } 6187 } 6188 6189 /* md_allow_write(mddev) 6190 * Calling this ensures that the array is marked 'active' so that writes 6191 * may proceed without blocking. It is important to call this before 6192 * attempting a GFP_KERNEL allocation while holding the mddev lock. 6193 * Must be called with mddev_lock held. 6194 * 6195 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock 6196 * is dropped, so return -EAGAIN after notifying userspace. 6197 */ 6198 int md_allow_write(mddev_t *mddev) 6199 { 6200 if (!mddev->pers) 6201 return 0; 6202 if (mddev->ro) 6203 return 0; 6204 if (!mddev->pers->sync_request) 6205 return 0; 6206 6207 spin_lock_irq(&mddev->write_lock); 6208 if (mddev->in_sync) { 6209 mddev->in_sync = 0; 6210 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 6211 if (mddev->safemode_delay && 6212 mddev->safemode == 0) 6213 mddev->safemode = 1; 6214 spin_unlock_irq(&mddev->write_lock); 6215 md_update_sb(mddev, 0); 6216 sysfs_notify_dirent(mddev->sysfs_state); 6217 } else 6218 spin_unlock_irq(&mddev->write_lock); 6219 6220 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) 6221 return -EAGAIN; 6222 else 6223 return 0; 6224 } 6225 EXPORT_SYMBOL_GPL(md_allow_write); 6226 6227 #define SYNC_MARKS 10 6228 #define SYNC_MARK_STEP (3*HZ) 6229 void md_do_sync(mddev_t *mddev) 6230 { 6231 mddev_t *mddev2; 6232 unsigned int currspeed = 0, 6233 window; 6234 sector_t max_sectors,j, io_sectors; 6235 unsigned long mark[SYNC_MARKS]; 6236 sector_t mark_cnt[SYNC_MARKS]; 6237 int last_mark,m; 6238 struct list_head *tmp; 6239 sector_t last_check; 6240 int skipped = 0; 6241 mdk_rdev_t *rdev; 6242 char *desc; 6243 6244 /* just incase thread restarts... */ 6245 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) 6246 return; 6247 if (mddev->ro) /* never try to sync a read-only array */ 6248 return; 6249 6250 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 6251 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) 6252 desc = "data-check"; 6253 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 6254 desc = "requested-resync"; 6255 else 6256 desc = "resync"; 6257 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 6258 desc = "reshape"; 6259 else 6260 desc = "recovery"; 6261 6262 /* we overload curr_resync somewhat here. 6263 * 0 == not engaged in resync at all 6264 * 2 == checking that there is no conflict with another sync 6265 * 1 == like 2, but have yielded to allow conflicting resync to 6266 * commense 6267 * other == active in resync - this many blocks 6268 * 6269 * Before starting a resync we must have set curr_resync to 6270 * 2, and then checked that every "conflicting" array has curr_resync 6271 * less than ours. When we find one that is the same or higher 6272 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync 6273 * to 1 if we choose to yield (based arbitrarily on address of mddev structure). 6274 * This will mean we have to start checking from the beginning again. 6275 * 6276 */ 6277 6278 do { 6279 mddev->curr_resync = 2; 6280 6281 try_again: 6282 if (kthread_should_stop()) { 6283 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6284 goto skip; 6285 } 6286 for_each_mddev(mddev2, tmp) { 6287 if (mddev2 == mddev) 6288 continue; 6289 if (!mddev->parallel_resync 6290 && mddev2->curr_resync 6291 && match_mddev_units(mddev, mddev2)) { 6292 DEFINE_WAIT(wq); 6293 if (mddev < mddev2 && mddev->curr_resync == 2) { 6294 /* arbitrarily yield */ 6295 mddev->curr_resync = 1; 6296 wake_up(&resync_wait); 6297 } 6298 if (mddev > mddev2 && mddev->curr_resync == 1) 6299 /* no need to wait here, we can wait the next 6300 * time 'round when curr_resync == 2 6301 */ 6302 continue; 6303 /* We need to wait 'interruptible' so as not to 6304 * contribute to the load average, and not to 6305 * be caught by 'softlockup' 6306 */ 6307 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); 6308 if (!kthread_should_stop() && 6309 mddev2->curr_resync >= mddev->curr_resync) { 6310 printk(KERN_INFO "md: delaying %s of %s" 6311 " until %s has finished (they" 6312 " share one or more physical units)\n", 6313 desc, mdname(mddev), mdname(mddev2)); 6314 mddev_put(mddev2); 6315 if (signal_pending(current)) 6316 flush_signals(current); 6317 schedule(); 6318 finish_wait(&resync_wait, &wq); 6319 goto try_again; 6320 } 6321 finish_wait(&resync_wait, &wq); 6322 } 6323 } 6324 } while (mddev->curr_resync < 2); 6325 6326 j = 0; 6327 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 6328 /* resync follows the size requested by the personality, 6329 * which defaults to physical size, but can be virtual size 6330 */ 6331 max_sectors = mddev->resync_max_sectors; 6332 mddev->resync_mismatches = 0; 6333 /* we don't use the checkpoint if there's a bitmap */ 6334 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 6335 j = mddev->resync_min; 6336 else if (!mddev->bitmap) 6337 j = mddev->recovery_cp; 6338 6339 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) 6340 max_sectors = mddev->dev_sectors; 6341 else { 6342 /* recovery follows the physical size of devices */ 6343 max_sectors = mddev->dev_sectors; 6344 j = MaxSector; 6345 list_for_each_entry(rdev, &mddev->disks, same_set) 6346 if (rdev->raid_disk >= 0 && 6347 !test_bit(Faulty, &rdev->flags) && 6348 !test_bit(In_sync, &rdev->flags) && 6349 rdev->recovery_offset < j) 6350 j = rdev->recovery_offset; 6351 } 6352 6353 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); 6354 printk(KERN_INFO "md: minimum _guaranteed_ speed:" 6355 " %d KB/sec/disk.\n", speed_min(mddev)); 6356 printk(KERN_INFO "md: using maximum available idle IO bandwidth " 6357 "(but not more than %d KB/sec) for %s.\n", 6358 speed_max(mddev), desc); 6359 6360 is_mddev_idle(mddev, 1); /* this initializes IO event counters */ 6361 6362 io_sectors = 0; 6363 for (m = 0; m < SYNC_MARKS; m++) { 6364 mark[m] = jiffies; 6365 mark_cnt[m] = io_sectors; 6366 } 6367 last_mark = 0; 6368 mddev->resync_mark = mark[last_mark]; 6369 mddev->resync_mark_cnt = mark_cnt[last_mark]; 6370 6371 /* 6372 * Tune reconstruction: 6373 */ 6374 window = 32*(PAGE_SIZE/512); 6375 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", 6376 window/2,(unsigned long long) max_sectors/2); 6377 6378 atomic_set(&mddev->recovery_active, 0); 6379 last_check = 0; 6380 6381 if (j>2) { 6382 printk(KERN_INFO 6383 "md: resuming %s of %s from checkpoint.\n", 6384 desc, mdname(mddev)); 6385 mddev->curr_resync = j; 6386 } 6387 6388 while (j < max_sectors) { 6389 sector_t sectors; 6390 6391 skipped = 0; 6392 6393 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 6394 ((mddev->curr_resync > mddev->curr_resync_completed && 6395 (mddev->curr_resync - mddev->curr_resync_completed) 6396 > (max_sectors >> 4)) || 6397 (j - mddev->curr_resync_completed)*2 6398 >= mddev->resync_max - mddev->curr_resync_completed 6399 )) { 6400 /* time to update curr_resync_completed */ 6401 blk_unplug(mddev->queue); 6402 wait_event(mddev->recovery_wait, 6403 atomic_read(&mddev->recovery_active) == 0); 6404 mddev->curr_resync_completed = 6405 mddev->curr_resync; 6406 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 6407 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 6408 } 6409 6410 while (j >= mddev->resync_max && !kthread_should_stop()) { 6411 /* As this condition is controlled by user-space, 6412 * we can block indefinitely, so use '_interruptible' 6413 * to avoid triggering warnings. 6414 */ 6415 flush_signals(current); /* just in case */ 6416 wait_event_interruptible(mddev->recovery_wait, 6417 mddev->resync_max > j 6418 || kthread_should_stop()); 6419 } 6420 6421 if (kthread_should_stop()) 6422 goto interrupted; 6423 6424 sectors = mddev->pers->sync_request(mddev, j, &skipped, 6425 currspeed < speed_min(mddev)); 6426 if (sectors == 0) { 6427 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6428 goto out; 6429 } 6430 6431 if (!skipped) { /* actual IO requested */ 6432 io_sectors += sectors; 6433 atomic_add(sectors, &mddev->recovery_active); 6434 } 6435 6436 j += sectors; 6437 if (j>1) mddev->curr_resync = j; 6438 mddev->curr_mark_cnt = io_sectors; 6439 if (last_check == 0) 6440 /* this is the earliers that rebuilt will be 6441 * visible in /proc/mdstat 6442 */ 6443 md_new_event(mddev); 6444 6445 if (last_check + window > io_sectors || j == max_sectors) 6446 continue; 6447 6448 last_check = io_sectors; 6449 6450 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 6451 break; 6452 6453 repeat: 6454 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { 6455 /* step marks */ 6456 int next = (last_mark+1) % SYNC_MARKS; 6457 6458 mddev->resync_mark = mark[next]; 6459 mddev->resync_mark_cnt = mark_cnt[next]; 6460 mark[next] = jiffies; 6461 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); 6462 last_mark = next; 6463 } 6464 6465 6466 if (kthread_should_stop()) 6467 goto interrupted; 6468 6469 6470 /* 6471 * this loop exits only if either when we are slower than 6472 * the 'hard' speed limit, or the system was IO-idle for 6473 * a jiffy. 6474 * the system might be non-idle CPU-wise, but we only care 6475 * about not overloading the IO subsystem. (things like an 6476 * e2fsck being done on the RAID array should execute fast) 6477 */ 6478 blk_unplug(mddev->queue); 6479 cond_resched(); 6480 6481 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 6482 /((jiffies-mddev->resync_mark)/HZ +1) +1; 6483 6484 if (currspeed > speed_min(mddev)) { 6485 if ((currspeed > speed_max(mddev)) || 6486 !is_mddev_idle(mddev, 0)) { 6487 msleep(500); 6488 goto repeat; 6489 } 6490 } 6491 } 6492 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); 6493 /* 6494 * this also signals 'finished resyncing' to md_stop 6495 */ 6496 out: 6497 blk_unplug(mddev->queue); 6498 6499 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); 6500 6501 /* tell personality that we are finished */ 6502 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); 6503 6504 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && 6505 mddev->curr_resync > 2) { 6506 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { 6507 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { 6508 if (mddev->curr_resync >= mddev->recovery_cp) { 6509 printk(KERN_INFO 6510 "md: checkpointing %s of %s.\n", 6511 desc, mdname(mddev)); 6512 mddev->recovery_cp = mddev->curr_resync; 6513 } 6514 } else 6515 mddev->recovery_cp = MaxSector; 6516 } else { 6517 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 6518 mddev->curr_resync = MaxSector; 6519 list_for_each_entry(rdev, &mddev->disks, same_set) 6520 if (rdev->raid_disk >= 0 && 6521 !test_bit(Faulty, &rdev->flags) && 6522 !test_bit(In_sync, &rdev->flags) && 6523 rdev->recovery_offset < mddev->curr_resync) 6524 rdev->recovery_offset = mddev->curr_resync; 6525 } 6526 } 6527 set_bit(MD_CHANGE_DEVS, &mddev->flags); 6528 6529 skip: 6530 mddev->curr_resync = 0; 6531 mddev->curr_resync_completed = 0; 6532 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) 6533 /* We completed so max setting can be forgotten. */ 6534 mddev->resync_max = MaxSector; 6535 sysfs_notify(&mddev->kobj, NULL, "sync_completed"); 6536 wake_up(&resync_wait); 6537 set_bit(MD_RECOVERY_DONE, &mddev->recovery); 6538 md_wakeup_thread(mddev->thread); 6539 return; 6540 6541 interrupted: 6542 /* 6543 * got a signal, exit. 6544 */ 6545 printk(KERN_INFO 6546 "md: md_do_sync() got signal ... exiting\n"); 6547 set_bit(MD_RECOVERY_INTR, &mddev->recovery); 6548 goto out; 6549 6550 } 6551 EXPORT_SYMBOL_GPL(md_do_sync); 6552 6553 6554 static int remove_and_add_spares(mddev_t *mddev) 6555 { 6556 mdk_rdev_t *rdev; 6557 int spares = 0; 6558 6559 mddev->curr_resync_completed = 0; 6560 6561 list_for_each_entry(rdev, &mddev->disks, same_set) 6562 if (rdev->raid_disk >= 0 && 6563 !test_bit(Blocked, &rdev->flags) && 6564 (test_bit(Faulty, &rdev->flags) || 6565 ! test_bit(In_sync, &rdev->flags)) && 6566 atomic_read(&rdev->nr_pending)==0) { 6567 if (mddev->pers->hot_remove_disk( 6568 mddev, rdev->raid_disk)==0) { 6569 char nm[20]; 6570 sprintf(nm,"rd%d", rdev->raid_disk); 6571 sysfs_remove_link(&mddev->kobj, nm); 6572 rdev->raid_disk = -1; 6573 } 6574 } 6575 6576 if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { 6577 list_for_each_entry(rdev, &mddev->disks, same_set) { 6578 if (rdev->raid_disk >= 0 && 6579 !test_bit(In_sync, &rdev->flags) && 6580 !test_bit(Blocked, &rdev->flags)) 6581 spares++; 6582 if (rdev->raid_disk < 0 6583 && !test_bit(Faulty, &rdev->flags)) { 6584 rdev->recovery_offset = 0; 6585 if (mddev->pers-> 6586 hot_add_disk(mddev, rdev) == 0) { 6587 char nm[20]; 6588 sprintf(nm, "rd%d", rdev->raid_disk); 6589 if (sysfs_create_link(&mddev->kobj, 6590 &rdev->kobj, nm)) 6591 printk(KERN_WARNING 6592 "md: cannot register " 6593 "%s for %s\n", 6594 nm, mdname(mddev)); 6595 spares++; 6596 md_new_event(mddev); 6597 } else 6598 break; 6599 } 6600 } 6601 } 6602 return spares; 6603 } 6604 /* 6605 * This routine is regularly called by all per-raid-array threads to 6606 * deal with generic issues like resync and super-block update. 6607 * Raid personalities that don't have a thread (linear/raid0) do not 6608 * need this as they never do any recovery or update the superblock. 6609 * 6610 * It does not do any resync itself, but rather "forks" off other threads 6611 * to do that as needed. 6612 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in 6613 * "->recovery" and create a thread at ->sync_thread. 6614 * When the thread finishes it sets MD_RECOVERY_DONE 6615 * and wakeups up this thread which will reap the thread and finish up. 6616 * This thread also removes any faulty devices (with nr_pending == 0). 6617 * 6618 * The overall approach is: 6619 * 1/ if the superblock needs updating, update it. 6620 * 2/ If a recovery thread is running, don't do anything else. 6621 * 3/ If recovery has finished, clean up, possibly marking spares active. 6622 * 4/ If there are any faulty devices, remove them. 6623 * 5/ If array is degraded, try to add spares devices 6624 * 6/ If array has spares or is not in-sync, start a resync thread. 6625 */ 6626 void md_check_recovery(mddev_t *mddev) 6627 { 6628 mdk_rdev_t *rdev; 6629 6630 6631 if (mddev->bitmap) 6632 bitmap_daemon_work(mddev->bitmap); 6633 6634 if (mddev->ro) 6635 return; 6636 6637 if (signal_pending(current)) { 6638 if (mddev->pers->sync_request && !mddev->external) { 6639 printk(KERN_INFO "md: %s in immediate safe mode\n", 6640 mdname(mddev)); 6641 mddev->safemode = 2; 6642 } 6643 flush_signals(current); 6644 } 6645 6646 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) 6647 return; 6648 if ( ! ( 6649 (mddev->flags && !mddev->external) || 6650 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || 6651 test_bit(MD_RECOVERY_DONE, &mddev->recovery) || 6652 (mddev->external == 0 && mddev->safemode == 1) || 6653 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) 6654 && !mddev->in_sync && mddev->recovery_cp == MaxSector) 6655 )) 6656 return; 6657 6658 if (mddev_trylock(mddev)) { 6659 int spares = 0; 6660 6661 if (mddev->ro) { 6662 /* Only thing we do on a ro array is remove 6663 * failed devices. 6664 */ 6665 remove_and_add_spares(mddev); 6666 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6667 goto unlock; 6668 } 6669 6670 if (!mddev->external) { 6671 int did_change = 0; 6672 spin_lock_irq(&mddev->write_lock); 6673 if (mddev->safemode && 6674 !atomic_read(&mddev->writes_pending) && 6675 !mddev->in_sync && 6676 mddev->recovery_cp == MaxSector) { 6677 mddev->in_sync = 1; 6678 did_change = 1; 6679 if (mddev->persistent) 6680 set_bit(MD_CHANGE_CLEAN, &mddev->flags); 6681 } 6682 if (mddev->safemode == 1) 6683 mddev->safemode = 0; 6684 spin_unlock_irq(&mddev->write_lock); 6685 if (did_change) 6686 sysfs_notify_dirent(mddev->sysfs_state); 6687 } 6688 6689 if (mddev->flags) 6690 md_update_sb(mddev, 0); 6691 6692 list_for_each_entry(rdev, &mddev->disks, same_set) 6693 if (test_and_clear_bit(StateChanged, &rdev->flags)) 6694 sysfs_notify_dirent(rdev->sysfs_state); 6695 6696 6697 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && 6698 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { 6699 /* resync/recovery still happening */ 6700 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6701 goto unlock; 6702 } 6703 if (mddev->sync_thread) { 6704 /* resync has finished, collect result */ 6705 md_unregister_thread(mddev->sync_thread); 6706 mddev->sync_thread = NULL; 6707 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && 6708 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 6709 /* success...*/ 6710 /* activate any spares */ 6711 if (mddev->pers->spare_active(mddev)) 6712 sysfs_notify(&mddev->kobj, NULL, 6713 "degraded"); 6714 } 6715 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 6716 mddev->pers->finish_reshape) 6717 mddev->pers->finish_reshape(mddev); 6718 md_update_sb(mddev, 1); 6719 6720 /* if array is no-longer degraded, then any saved_raid_disk 6721 * information must be scrapped 6722 */ 6723 if (!mddev->degraded) 6724 list_for_each_entry(rdev, &mddev->disks, same_set) 6725 rdev->saved_raid_disk = -1; 6726 6727 mddev->recovery = 0; 6728 /* flag recovery needed just to double check */ 6729 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6730 sysfs_notify_dirent(mddev->sysfs_action); 6731 md_new_event(mddev); 6732 goto unlock; 6733 } 6734 /* Set RUNNING before clearing NEEDED to avoid 6735 * any transients in the value of "sync_action". 6736 */ 6737 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 6738 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 6739 /* Clear some bits that don't mean anything, but 6740 * might be left set 6741 */ 6742 clear_bit(MD_RECOVERY_INTR, &mddev->recovery); 6743 clear_bit(MD_RECOVERY_DONE, &mddev->recovery); 6744 6745 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) 6746 goto unlock; 6747 /* no recovery is running. 6748 * remove any failed drives, then 6749 * add spares if possible. 6750 * Spare are also removed and re-added, to allow 6751 * the personality to fail the re-add. 6752 */ 6753 6754 if (mddev->reshape_position != MaxSector) { 6755 if (mddev->pers->check_reshape == NULL || 6756 mddev->pers->check_reshape(mddev) != 0) 6757 /* Cannot proceed */ 6758 goto unlock; 6759 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); 6760 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 6761 } else if ((spares = remove_and_add_spares(mddev))) { 6762 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); 6763 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); 6764 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); 6765 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 6766 } else if (mddev->recovery_cp < MaxSector) { 6767 set_bit(MD_RECOVERY_SYNC, &mddev->recovery); 6768 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 6769 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) 6770 /* nothing to be done ... */ 6771 goto unlock; 6772 6773 if (mddev->pers->sync_request) { 6774 if (spares && mddev->bitmap && ! mddev->bitmap->file) { 6775 /* We are adding a device or devices to an array 6776 * which has the bitmap stored on all devices. 6777 * So make sure all bitmap pages get written 6778 */ 6779 bitmap_write_all(mddev->bitmap); 6780 } 6781 mddev->sync_thread = md_register_thread(md_do_sync, 6782 mddev, 6783 "resync"); 6784 if (!mddev->sync_thread) { 6785 printk(KERN_ERR "%s: could not start resync" 6786 " thread...\n", 6787 mdname(mddev)); 6788 /* leave the spares where they are, it shouldn't hurt */ 6789 mddev->recovery = 0; 6790 } else 6791 md_wakeup_thread(mddev->sync_thread); 6792 sysfs_notify_dirent(mddev->sysfs_action); 6793 md_new_event(mddev); 6794 } 6795 unlock: 6796 if (!mddev->sync_thread) { 6797 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); 6798 if (test_and_clear_bit(MD_RECOVERY_RECOVER, 6799 &mddev->recovery)) 6800 if (mddev->sysfs_action) 6801 sysfs_notify_dirent(mddev->sysfs_action); 6802 } 6803 mddev_unlock(mddev); 6804 } 6805 } 6806 6807 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) 6808 { 6809 sysfs_notify_dirent(rdev->sysfs_state); 6810 wait_event_timeout(rdev->blocked_wait, 6811 !test_bit(Blocked, &rdev->flags), 6812 msecs_to_jiffies(5000)); 6813 rdev_dec_pending(rdev, mddev); 6814 } 6815 EXPORT_SYMBOL(md_wait_for_blocked_rdev); 6816 6817 static int md_notify_reboot(struct notifier_block *this, 6818 unsigned long code, void *x) 6819 { 6820 struct list_head *tmp; 6821 mddev_t *mddev; 6822 6823 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { 6824 6825 printk(KERN_INFO "md: stopping all md devices.\n"); 6826 6827 for_each_mddev(mddev, tmp) 6828 if (mddev_trylock(mddev)) { 6829 /* Force a switch to readonly even array 6830 * appears to still be in use. Hence 6831 * the '100'. 6832 */ 6833 do_md_stop(mddev, 1, 100); 6834 mddev_unlock(mddev); 6835 } 6836 /* 6837 * certain more exotic SCSI devices are known to be 6838 * volatile wrt too early system reboots. While the 6839 * right place to handle this issue is the given 6840 * driver, we do want to have a safe RAID driver ... 6841 */ 6842 mdelay(1000*1); 6843 } 6844 return NOTIFY_DONE; 6845 } 6846 6847 static struct notifier_block md_notifier = { 6848 .notifier_call = md_notify_reboot, 6849 .next = NULL, 6850 .priority = INT_MAX, /* before any real devices */ 6851 }; 6852 6853 static void md_geninit(void) 6854 { 6855 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); 6856 6857 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); 6858 } 6859 6860 static int __init md_init(void) 6861 { 6862 if (register_blkdev(MD_MAJOR, "md")) 6863 return -1; 6864 if ((mdp_major=register_blkdev(0, "mdp"))<=0) { 6865 unregister_blkdev(MD_MAJOR, "md"); 6866 return -1; 6867 } 6868 blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, 6869 md_probe, NULL, NULL); 6870 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, 6871 md_probe, NULL, NULL); 6872 6873 register_reboot_notifier(&md_notifier); 6874 raid_table_header = register_sysctl_table(raid_root_table); 6875 6876 md_geninit(); 6877 return 0; 6878 } 6879 6880 6881 #ifndef MODULE 6882 6883 /* 6884 * Searches all registered partitions for autorun RAID arrays 6885 * at boot time. 6886 */ 6887 6888 static LIST_HEAD(all_detected_devices); 6889 struct detected_devices_node { 6890 struct list_head list; 6891 dev_t dev; 6892 }; 6893 6894 void md_autodetect_dev(dev_t dev) 6895 { 6896 struct detected_devices_node *node_detected_dev; 6897 6898 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); 6899 if (node_detected_dev) { 6900 node_detected_dev->dev = dev; 6901 list_add_tail(&node_detected_dev->list, &all_detected_devices); 6902 } else { 6903 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" 6904 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); 6905 } 6906 } 6907 6908 6909 static void autostart_arrays(int part) 6910 { 6911 mdk_rdev_t *rdev; 6912 struct detected_devices_node *node_detected_dev; 6913 dev_t dev; 6914 int i_scanned, i_passed; 6915 6916 i_scanned = 0; 6917 i_passed = 0; 6918 6919 printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); 6920 6921 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { 6922 i_scanned++; 6923 node_detected_dev = list_entry(all_detected_devices.next, 6924 struct detected_devices_node, list); 6925 list_del(&node_detected_dev->list); 6926 dev = node_detected_dev->dev; 6927 kfree(node_detected_dev); 6928 rdev = md_import_device(dev,0, 90); 6929 if (IS_ERR(rdev)) 6930 continue; 6931 6932 if (test_bit(Faulty, &rdev->flags)) { 6933 MD_BUG(); 6934 continue; 6935 } 6936 set_bit(AutoDetected, &rdev->flags); 6937 list_add(&rdev->same_set, &pending_raid_disks); 6938 i_passed++; 6939 } 6940 6941 printk(KERN_INFO "md: Scanned %d and added %d devices.\n", 6942 i_scanned, i_passed); 6943 6944 autorun_devices(part); 6945 } 6946 6947 #endif /* !MODULE */ 6948 6949 static __exit void md_exit(void) 6950 { 6951 mddev_t *mddev; 6952 struct list_head *tmp; 6953 6954 blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); 6955 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); 6956 6957 unregister_blkdev(MD_MAJOR,"md"); 6958 unregister_blkdev(mdp_major, "mdp"); 6959 unregister_reboot_notifier(&md_notifier); 6960 unregister_sysctl_table(raid_table_header); 6961 remove_proc_entry("mdstat", NULL); 6962 for_each_mddev(mddev, tmp) { 6963 export_array(mddev); 6964 mddev->hold_active = 0; 6965 } 6966 } 6967 6968 subsys_initcall(md_init); 6969 module_exit(md_exit) 6970 6971 static int get_ro(char *buffer, struct kernel_param *kp) 6972 { 6973 return sprintf(buffer, "%d", start_readonly); 6974 } 6975 static int set_ro(const char *val, struct kernel_param *kp) 6976 { 6977 char *e; 6978 int num = simple_strtoul(val, &e, 10); 6979 if (*val && (*e == '\0' || *e == '\n')) { 6980 start_readonly = num; 6981 return 0; 6982 } 6983 return -EINVAL; 6984 } 6985 6986 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); 6987 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); 6988 6989 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); 6990 6991 EXPORT_SYMBOL(register_md_personality); 6992 EXPORT_SYMBOL(unregister_md_personality); 6993 EXPORT_SYMBOL(md_error); 6994 EXPORT_SYMBOL(md_done_sync); 6995 EXPORT_SYMBOL(md_write_start); 6996 EXPORT_SYMBOL(md_write_end); 6997 EXPORT_SYMBOL(md_register_thread); 6998 EXPORT_SYMBOL(md_unregister_thread); 6999 EXPORT_SYMBOL(md_wakeup_thread); 7000 EXPORT_SYMBOL(md_check_recovery); 7001 MODULE_LICENSE("GPL"); 7002 MODULE_ALIAS("md"); 7003 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); 7004